Mercurial > hg > graal-compiler
annotate src/share/vm/c1/c1_LinearScan.cpp @ 1819:f02a8bbe6ed4
6986046: C1 valuestack cleanup
Summary: fixes an historical oddity in C1 with inlining where all of the expression stacks are kept in the topmost ValueStack instead of being in their respective ValueStacks.
Reviewed-by: never
Contributed-by: Christian Wimmer <cwimmer@uci.edu>
| author | roland |
|---|---|
| date | Tue, 29 Dec 2009 19:08:54 +0100 |
| parents | 87b64980e2f1 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_c1_LinearScan.cpp.incl" | |
| 27 | |
| 28 | |
| 29 #ifndef PRODUCT | |
| 30 | |
| 31 static LinearScanStatistic _stat_before_alloc; | |
| 32 static LinearScanStatistic _stat_after_asign; | |
| 33 static LinearScanStatistic _stat_final; | |
| 34 | |
| 35 static LinearScanTimers _total_timer; | |
| 36 | |
| 37 // helper macro for short definition of timer | |
| 38 #define TIME_LINEAR_SCAN(timer_name) TraceTime _block_timer("", _total_timer.timer(LinearScanTimers::timer_name), TimeLinearScan || TimeEachLinearScan, Verbose); | |
| 39 | |
| 40 // helper macro for short definition of trace-output inside code | |
| 41 #define TRACE_LINEAR_SCAN(level, code) \ | |
| 42 if (TraceLinearScanLevel >= level) { \ | |
| 43 code; \ | |
| 44 } | |
| 45 | |
| 46 #else | |
| 47 | |
| 48 #define TIME_LINEAR_SCAN(timer_name) | |
| 49 #define TRACE_LINEAR_SCAN(level, code) | |
| 50 | |
| 51 #endif | |
| 52 | |
| 53 // Map BasicType to spill size in 32-bit words, matching VMReg's notion of words | |
| 54 #ifdef _LP64 | |
| 55 static int type2spill_size[T_CONFLICT+1]={ -1, 0, 0, 0, 1, 1, 1, 2, 1, 1, 1, 2, 2, 2, 0, 1, -1}; | |
| 56 #else | |
| 57 static int type2spill_size[T_CONFLICT+1]={ -1, 0, 0, 0, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 0, 1, -1}; | |
| 58 #endif | |
| 59 | |
| 60 | |
| 61 // Implementation of LinearScan | |
| 62 | |
| 63 LinearScan::LinearScan(IR* ir, LIRGenerator* gen, FrameMap* frame_map) | |
| 64 : _compilation(ir->compilation()) | |
| 65 , _ir(ir) | |
| 66 , _gen(gen) | |
| 67 , _frame_map(frame_map) | |
| 68 , _num_virtual_regs(gen->max_virtual_register_number()) | |
| 69 , _has_fpu_registers(false) | |
| 70 , _num_calls(-1) | |
| 71 , _max_spills(0) | |
| 72 , _unused_spill_slot(-1) | |
| 73 , _intervals(0) // initialized later with correct length | |
| 74 , _new_intervals_from_allocation(new IntervalList()) | |
| 75 , _sorted_intervals(NULL) | |
| 76 , _lir_ops(0) // initialized later with correct length | |
| 77 , _block_of_op(0) // initialized later with correct length | |
| 78 , _has_info(0) | |
| 79 , _has_call(0) | |
| 80 , _scope_value_cache(0) // initialized later with correct length | |
| 81 , _interval_in_loop(0, 0) // initialized later with correct length | |
| 82 , _cached_blocks(*ir->linear_scan_order()) | |
| 304 | 83 #ifdef X86 |
| 0 | 84 , _fpu_stack_allocator(NULL) |
| 85 #endif | |
| 86 { | |
| 87 assert(this->ir() != NULL, "check if valid"); | |
| 88 assert(this->compilation() != NULL, "check if valid"); | |
| 89 assert(this->gen() != NULL, "check if valid"); | |
| 90 assert(this->frame_map() != NULL, "check if valid"); | |
| 91 } | |
| 92 | |
| 93 | |
| 94 // ********** functions for converting LIR-Operands to register numbers | |
| 95 // | |
| 96 // Emulate a flat register file comprising physical integer registers, | |
| 97 // physical floating-point registers and virtual registers, in that order. | |
| 98 // Virtual registers already have appropriate numbers, since V0 is | |
| 99 // the number of physical registers. | |
| 100 // Returns -1 for hi word if opr is a single word operand. | |
| 101 // | |
| 102 // Note: the inverse operation (calculating an operand for register numbers) | |
| 103 // is done in calc_operand_for_interval() | |
| 104 | |
| 105 int LinearScan::reg_num(LIR_Opr opr) { | |
| 106 assert(opr->is_register(), "should not call this otherwise"); | |
| 107 | |
| 108 if (opr->is_virtual_register()) { | |
| 109 assert(opr->vreg_number() >= nof_regs, "found a virtual register with a fixed-register number"); | |
| 110 return opr->vreg_number(); | |
| 111 } else if (opr->is_single_cpu()) { | |
| 112 return opr->cpu_regnr(); | |
| 113 } else if (opr->is_double_cpu()) { | |
| 114 return opr->cpu_regnrLo(); | |
| 304 | 115 #ifdef X86 |
| 0 | 116 } else if (opr->is_single_xmm()) { |
| 117 return opr->fpu_regnr() + pd_first_xmm_reg; | |
| 118 } else if (opr->is_double_xmm()) { | |
| 119 return opr->fpu_regnrLo() + pd_first_xmm_reg; | |
| 120 #endif | |
| 121 } else if (opr->is_single_fpu()) { | |
| 122 return opr->fpu_regnr() + pd_first_fpu_reg; | |
| 123 } else if (opr->is_double_fpu()) { | |
| 124 return opr->fpu_regnrLo() + pd_first_fpu_reg; | |
| 125 } else { | |
| 126 ShouldNotReachHere(); | |
| 304 | 127 return -1; |
| 0 | 128 } |
| 129 } | |
| 130 | |
| 131 int LinearScan::reg_numHi(LIR_Opr opr) { | |
| 132 assert(opr->is_register(), "should not call this otherwise"); | |
| 133 | |
| 134 if (opr->is_virtual_register()) { | |
| 135 return -1; | |
| 136 } else if (opr->is_single_cpu()) { | |
| 137 return -1; | |
| 138 } else if (opr->is_double_cpu()) { | |
| 139 return opr->cpu_regnrHi(); | |
| 304 | 140 #ifdef X86 |
| 0 | 141 } else if (opr->is_single_xmm()) { |
| 142 return -1; | |
| 143 } else if (opr->is_double_xmm()) { | |
| 144 return -1; | |
| 145 #endif | |
| 146 } else if (opr->is_single_fpu()) { | |
| 147 return -1; | |
| 148 } else if (opr->is_double_fpu()) { | |
| 149 return opr->fpu_regnrHi() + pd_first_fpu_reg; | |
| 150 } else { | |
| 151 ShouldNotReachHere(); | |
| 304 | 152 return -1; |
| 0 | 153 } |
| 154 } | |
| 155 | |
| 156 | |
| 157 // ********** functions for classification of intervals | |
| 158 | |
| 159 bool LinearScan::is_precolored_interval(const Interval* i) { | |
| 160 return i->reg_num() < LinearScan::nof_regs; | |
| 161 } | |
| 162 | |
| 163 bool LinearScan::is_virtual_interval(const Interval* i) { | |
| 164 return i->reg_num() >= LIR_OprDesc::vreg_base; | |
| 165 } | |
| 166 | |
| 167 bool LinearScan::is_precolored_cpu_interval(const Interval* i) { | |
| 168 return i->reg_num() < LinearScan::nof_cpu_regs; | |
| 169 } | |
| 170 | |
| 171 bool LinearScan::is_virtual_cpu_interval(const Interval* i) { | |
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172 #if defined(__SOFTFP__) || defined(E500V2) |
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173 return i->reg_num() >= LIR_OprDesc::vreg_base; |
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174 #else |
| 0 | 175 return i->reg_num() >= LIR_OprDesc::vreg_base && (i->type() != T_FLOAT && i->type() != T_DOUBLE); |
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176 #endif // __SOFTFP__ or E500V2 |
| 0 | 177 } |
| 178 | |
| 179 bool LinearScan::is_precolored_fpu_interval(const Interval* i) { | |
| 180 return i->reg_num() >= LinearScan::nof_cpu_regs && i->reg_num() < LinearScan::nof_regs; | |
| 181 } | |
| 182 | |
| 183 bool LinearScan::is_virtual_fpu_interval(const Interval* i) { | |
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184 #if defined(__SOFTFP__) || defined(E500V2) |
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185 return false; |
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186 #else |
| 0 | 187 return i->reg_num() >= LIR_OprDesc::vreg_base && (i->type() == T_FLOAT || i->type() == T_DOUBLE); |
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188 #endif // __SOFTFP__ or E500V2 |
| 0 | 189 } |
| 190 | |
| 191 bool LinearScan::is_in_fpu_register(const Interval* i) { | |
| 192 // fixed intervals not needed for FPU stack allocation | |
| 193 return i->reg_num() >= nof_regs && pd_first_fpu_reg <= i->assigned_reg() && i->assigned_reg() <= pd_last_fpu_reg; | |
| 194 } | |
| 195 | |
| 196 bool LinearScan::is_oop_interval(const Interval* i) { | |
| 197 // fixed intervals never contain oops | |
| 198 return i->reg_num() >= nof_regs && i->type() == T_OBJECT; | |
| 199 } | |
| 200 | |
| 201 | |
| 202 // ********** General helper functions | |
| 203 | |
| 204 // compute next unused stack index that can be used for spilling | |
| 205 int LinearScan::allocate_spill_slot(bool double_word) { | |
| 206 int spill_slot; | |
| 207 if (double_word) { | |
| 208 if ((_max_spills & 1) == 1) { | |
| 209 // alignment of double-word values | |
| 210 // the hole because of the alignment is filled with the next single-word value | |
| 211 assert(_unused_spill_slot == -1, "wasting a spill slot"); | |
| 212 _unused_spill_slot = _max_spills; | |
| 213 _max_spills++; | |
| 214 } | |
| 215 spill_slot = _max_spills; | |
| 216 _max_spills += 2; | |
| 217 | |
| 218 } else if (_unused_spill_slot != -1) { | |
| 219 // re-use hole that was the result of a previous double-word alignment | |
| 220 spill_slot = _unused_spill_slot; | |
| 221 _unused_spill_slot = -1; | |
| 222 | |
| 223 } else { | |
| 224 spill_slot = _max_spills; | |
| 225 _max_spills++; | |
| 226 } | |
| 227 | |
| 228 int result = spill_slot + LinearScan::nof_regs + frame_map()->argcount(); | |
| 229 | |
| 230 // the class OopMapValue uses only 11 bits for storing the name of the | |
| 231 // oop location. So a stack slot bigger than 2^11 leads to an overflow | |
| 232 // that is not reported in product builds. Prevent this by checking the | |
| 233 // spill slot here (altough this value and the later used location name | |
| 234 // are slightly different) | |
| 235 if (result > 2000) { | |
| 236 bailout("too many stack slots used"); | |
| 237 } | |
| 238 | |
| 239 return result; | |
| 240 } | |
| 241 | |
| 242 void LinearScan::assign_spill_slot(Interval* it) { | |
| 243 // assign the canonical spill slot of the parent (if a part of the interval | |
| 244 // is already spilled) or allocate a new spill slot | |
| 245 if (it->canonical_spill_slot() >= 0) { | |
| 246 it->assign_reg(it->canonical_spill_slot()); | |
| 247 } else { | |
| 248 int spill = allocate_spill_slot(type2spill_size[it->type()] == 2); | |
| 249 it->set_canonical_spill_slot(spill); | |
| 250 it->assign_reg(spill); | |
| 251 } | |
| 252 } | |
| 253 | |
| 254 void LinearScan::propagate_spill_slots() { | |
| 255 if (!frame_map()->finalize_frame(max_spills())) { | |
| 256 bailout("frame too large"); | |
| 257 } | |
| 258 } | |
| 259 | |
| 260 // create a new interval with a predefined reg_num | |
| 261 // (only used for parent intervals that are created during the building phase) | |
| 262 Interval* LinearScan::create_interval(int reg_num) { | |
| 263 assert(_intervals.at(reg_num) == NULL, "overwriting exisiting interval"); | |
| 264 | |
| 265 Interval* interval = new Interval(reg_num); | |
| 266 _intervals.at_put(reg_num, interval); | |
| 267 | |
| 268 // assign register number for precolored intervals | |
| 269 if (reg_num < LIR_OprDesc::vreg_base) { | |
| 270 interval->assign_reg(reg_num); | |
| 271 } | |
| 272 return interval; | |
| 273 } | |
| 274 | |
| 275 // assign a new reg_num to the interval and append it to the list of intervals | |
| 276 // (only used for child intervals that are created during register allocation) | |
| 277 void LinearScan::append_interval(Interval* it) { | |
| 278 it->set_reg_num(_intervals.length()); | |
| 279 _intervals.append(it); | |
| 280 _new_intervals_from_allocation->append(it); | |
| 281 } | |
| 282 | |
| 283 // copy the vreg-flags if an interval is split | |
| 284 void LinearScan::copy_register_flags(Interval* from, Interval* to) { | |
| 285 if (gen()->is_vreg_flag_set(from->reg_num(), LIRGenerator::byte_reg)) { | |
| 286 gen()->set_vreg_flag(to->reg_num(), LIRGenerator::byte_reg); | |
| 287 } | |
| 288 if (gen()->is_vreg_flag_set(from->reg_num(), LIRGenerator::callee_saved)) { | |
| 289 gen()->set_vreg_flag(to->reg_num(), LIRGenerator::callee_saved); | |
| 290 } | |
| 291 | |
| 292 // Note: do not copy the must_start_in_memory flag because it is not necessary for child | |
| 293 // intervals (only the very beginning of the interval must be in memory) | |
| 294 } | |
| 295 | |
| 296 | |
| 297 // ********** spill move optimization | |
| 298 // eliminate moves from register to stack if stack slot is known to be correct | |
| 299 | |
| 300 // called during building of intervals | |
| 301 void LinearScan::change_spill_definition_pos(Interval* interval, int def_pos) { | |
| 302 assert(interval->is_split_parent(), "can only be called for split parents"); | |
| 303 | |
| 304 switch (interval->spill_state()) { | |
| 305 case noDefinitionFound: | |
| 306 assert(interval->spill_definition_pos() == -1, "must no be set before"); | |
| 307 interval->set_spill_definition_pos(def_pos); | |
| 308 interval->set_spill_state(oneDefinitionFound); | |
| 309 break; | |
| 310 | |
| 311 case oneDefinitionFound: | |
| 312 assert(def_pos <= interval->spill_definition_pos(), "positions are processed in reverse order when intervals are created"); | |
| 313 if (def_pos < interval->spill_definition_pos() - 2) { | |
| 314 // second definition found, so no spill optimization possible for this interval | |
| 315 interval->set_spill_state(noOptimization); | |
| 316 } else { | |
| 317 // two consecutive definitions (because of two-operand LIR form) | |
| 318 assert(block_of_op_with_id(def_pos) == block_of_op_with_id(interval->spill_definition_pos()), "block must be equal"); | |
| 319 } | |
| 320 break; | |
| 321 | |
| 322 case noOptimization: | |
| 323 // nothing to do | |
| 324 break; | |
| 325 | |
| 326 default: | |
| 327 assert(false, "other states not allowed at this time"); | |
| 328 } | |
| 329 } | |
| 330 | |
| 331 // called during register allocation | |
| 332 void LinearScan::change_spill_state(Interval* interval, int spill_pos) { | |
| 333 switch (interval->spill_state()) { | |
| 334 case oneDefinitionFound: { | |
| 335 int def_loop_depth = block_of_op_with_id(interval->spill_definition_pos())->loop_depth(); | |
| 336 int spill_loop_depth = block_of_op_with_id(spill_pos)->loop_depth(); | |
| 337 | |
| 338 if (def_loop_depth < spill_loop_depth) { | |
| 339 // the loop depth of the spilling position is higher then the loop depth | |
| 340 // at the definition of the interval -> move write to memory out of loop | |
| 341 // by storing at definitin of the interval | |
| 342 interval->set_spill_state(storeAtDefinition); | |
| 343 } else { | |
| 344 // the interval is currently spilled only once, so for now there is no | |
| 345 // reason to store the interval at the definition | |
| 346 interval->set_spill_state(oneMoveInserted); | |
| 347 } | |
| 348 break; | |
| 349 } | |
| 350 | |
| 351 case oneMoveInserted: { | |
| 352 // the interval is spilled more then once, so it is better to store it to | |
| 353 // memory at the definition | |
| 354 interval->set_spill_state(storeAtDefinition); | |
| 355 break; | |
| 356 } | |
| 357 | |
| 358 case storeAtDefinition: | |
| 359 case startInMemory: | |
| 360 case noOptimization: | |
| 361 case noDefinitionFound: | |
| 362 // nothing to do | |
| 363 break; | |
| 364 | |
| 365 default: | |
| 366 assert(false, "other states not allowed at this time"); | |
| 367 } | |
| 368 } | |
| 369 | |
| 370 | |
| 371 bool LinearScan::must_store_at_definition(const Interval* i) { | |
| 372 return i->is_split_parent() && i->spill_state() == storeAtDefinition; | |
| 373 } | |
| 374 | |
| 375 // called once before asignment of register numbers | |
| 376 void LinearScan::eliminate_spill_moves() { | |
| 377 TIME_LINEAR_SCAN(timer_eliminate_spill_moves); | |
| 378 TRACE_LINEAR_SCAN(3, tty->print_cr("***** Eliminating unnecessary spill moves")); | |
| 379 | |
| 380 // collect all intervals that must be stored after their definion. | |
| 381 // the list is sorted by Interval::spill_definition_pos | |
| 382 Interval* interval; | |
| 383 Interval* temp_list; | |
| 384 create_unhandled_lists(&interval, &temp_list, must_store_at_definition, NULL); | |
| 385 | |
| 386 #ifdef ASSERT | |
| 387 Interval* prev = NULL; | |
| 388 Interval* temp = interval; | |
| 389 while (temp != Interval::end()) { | |
| 390 assert(temp->spill_definition_pos() > 0, "invalid spill definition pos"); | |
| 391 if (prev != NULL) { | |
| 392 assert(temp->from() >= prev->from(), "intervals not sorted"); | |
| 393 assert(temp->spill_definition_pos() >= prev->spill_definition_pos(), "when intervals are sorted by from, then they must also be sorted by spill_definition_pos"); | |
| 394 } | |
| 395 | |
| 396 assert(temp->canonical_spill_slot() >= LinearScan::nof_regs, "interval has no spill slot assigned"); | |
| 397 assert(temp->spill_definition_pos() >= temp->from(), "invalid order"); | |
| 398 assert(temp->spill_definition_pos() <= temp->from() + 2, "only intervals defined once at their start-pos can be optimized"); | |
| 399 | |
| 400 TRACE_LINEAR_SCAN(4, tty->print_cr("interval %d (from %d to %d) must be stored at %d", temp->reg_num(), temp->from(), temp->to(), temp->spill_definition_pos())); | |
| 401 | |
| 402 temp = temp->next(); | |
| 403 } | |
| 404 #endif | |
| 405 | |
| 406 LIR_InsertionBuffer insertion_buffer; | |
| 407 int num_blocks = block_count(); | |
| 408 for (int i = 0; i < num_blocks; i++) { | |
| 409 BlockBegin* block = block_at(i); | |
| 410 LIR_OpList* instructions = block->lir()->instructions_list(); | |
| 411 int num_inst = instructions->length(); | |
| 412 bool has_new = false; | |
| 413 | |
| 414 // iterate all instructions of the block. skip the first because it is always a label | |
| 415 for (int j = 1; j < num_inst; j++) { | |
| 416 LIR_Op* op = instructions->at(j); | |
| 417 int op_id = op->id(); | |
| 418 | |
| 419 if (op_id == -1) { | |
| 420 // remove move from register to stack if the stack slot is guaranteed to be correct. | |
| 421 // only moves that have been inserted by LinearScan can be removed. | |
| 422 assert(op->code() == lir_move, "only moves can have a op_id of -1"); | |
| 423 assert(op->as_Op1() != NULL, "move must be LIR_Op1"); | |
| 424 assert(op->as_Op1()->result_opr()->is_virtual(), "LinearScan inserts only moves to virtual registers"); | |
| 425 | |
| 426 LIR_Op1* op1 = (LIR_Op1*)op; | |
| 427 Interval* interval = interval_at(op1->result_opr()->vreg_number()); | |
| 428 | |
| 429 if (interval->assigned_reg() >= LinearScan::nof_regs && interval->always_in_memory()) { | |
| 430 // move target is a stack slot that is always correct, so eliminate instruction | |
| 431 TRACE_LINEAR_SCAN(4, tty->print_cr("eliminating move from interval %d to %d", op1->in_opr()->vreg_number(), op1->result_opr()->vreg_number())); | |
| 432 instructions->at_put(j, NULL); // NULL-instructions are deleted by assign_reg_num | |
| 433 } | |
| 434 | |
| 435 } else { | |
| 436 // insert move from register to stack just after the beginning of the interval | |
| 437 assert(interval == Interval::end() || interval->spill_definition_pos() >= op_id, "invalid order"); | |
| 438 assert(interval == Interval::end() || (interval->is_split_parent() && interval->spill_state() == storeAtDefinition), "invalid interval"); | |
| 439 | |
| 440 while (interval != Interval::end() && interval->spill_definition_pos() == op_id) { | |
| 441 if (!has_new) { | |
| 442 // prepare insertion buffer (appended when all instructions of the block are processed) | |
| 443 insertion_buffer.init(block->lir()); | |
| 444 has_new = true; | |
| 445 } | |
| 446 | |
| 447 LIR_Opr from_opr = operand_for_interval(interval); | |
| 448 LIR_Opr to_opr = canonical_spill_opr(interval); | |
| 449 assert(from_opr->is_fixed_cpu() || from_opr->is_fixed_fpu(), "from operand must be a register"); | |
| 450 assert(to_opr->is_stack(), "to operand must be a stack slot"); | |
| 451 | |
| 452 insertion_buffer.move(j, from_opr, to_opr); | |
| 453 TRACE_LINEAR_SCAN(4, tty->print_cr("inserting move after definition of interval %d to stack slot %d at op_id %d", interval->reg_num(), interval->canonical_spill_slot() - LinearScan::nof_regs, op_id)); | |
| 454 | |
| 455 interval = interval->next(); | |
| 456 } | |
| 457 } | |
| 458 } // end of instruction iteration | |
| 459 | |
| 460 if (has_new) { | |
| 461 block->lir()->append(&insertion_buffer); | |
| 462 } | |
| 463 } // end of block iteration | |
| 464 | |
| 465 assert(interval == Interval::end(), "missed an interval"); | |
| 466 } | |
| 467 | |
| 468 | |
| 469 // ********** Phase 1: number all instructions in all blocks | |
| 470 // Compute depth-first and linear scan block orders, and number LIR_Op nodes for linear scan. | |
| 471 | |
| 472 void LinearScan::number_instructions() { | |
| 473 { | |
| 474 // dummy-timer to measure the cost of the timer itself | |
| 475 // (this time is then subtracted from all other timers to get the real value) | |
| 476 TIME_LINEAR_SCAN(timer_do_nothing); | |
| 477 } | |
| 478 TIME_LINEAR_SCAN(timer_number_instructions); | |
| 479 | |
| 480 // Assign IDs to LIR nodes and build a mapping, lir_ops, from ID to LIR_Op node. | |
| 481 int num_blocks = block_count(); | |
| 482 int num_instructions = 0; | |
| 483 int i; | |
| 484 for (i = 0; i < num_blocks; i++) { | |
| 485 num_instructions += block_at(i)->lir()->instructions_list()->length(); | |
| 486 } | |
| 487 | |
| 488 // initialize with correct length | |
| 489 _lir_ops = LIR_OpArray(num_instructions); | |
| 490 _block_of_op = BlockBeginArray(num_instructions); | |
| 491 | |
| 492 int op_id = 0; | |
| 493 int idx = 0; | |
| 494 | |
| 495 for (i = 0; i < num_blocks; i++) { | |
| 496 BlockBegin* block = block_at(i); | |
| 497 block->set_first_lir_instruction_id(op_id); | |
| 498 LIR_OpList* instructions = block->lir()->instructions_list(); | |
| 499 | |
| 500 int num_inst = instructions->length(); | |
| 501 for (int j = 0; j < num_inst; j++) { | |
| 502 LIR_Op* op = instructions->at(j); | |
| 503 op->set_id(op_id); | |
| 504 | |
| 505 _lir_ops.at_put(idx, op); | |
| 506 _block_of_op.at_put(idx, block); | |
| 507 assert(lir_op_with_id(op_id) == op, "must match"); | |
| 508 | |
| 509 idx++; | |
| 510 op_id += 2; // numbering of lir_ops by two | |
| 511 } | |
| 512 block->set_last_lir_instruction_id(op_id - 2); | |
| 513 } | |
| 514 assert(idx == num_instructions, "must match"); | |
| 515 assert(idx * 2 == op_id, "must match"); | |
| 516 | |
| 517 _has_call = BitMap(num_instructions); _has_call.clear(); | |
| 518 _has_info = BitMap(num_instructions); _has_info.clear(); | |
| 519 } | |
| 520 | |
| 521 | |
| 522 // ********** Phase 2: compute local live sets separately for each block | |
| 523 // (sets live_gen and live_kill for each block) | |
| 524 | |
| 525 void LinearScan::set_live_gen_kill(Value value, LIR_Op* op, BitMap& live_gen, BitMap& live_kill) { | |
| 526 LIR_Opr opr = value->operand(); | |
| 527 Constant* con = value->as_Constant(); | |
| 528 | |
| 529 // check some asumptions about debug information | |
| 530 assert(!value->type()->is_illegal(), "if this local is used by the interpreter it shouldn't be of indeterminate type"); | |
| 531 assert(con == NULL || opr->is_virtual() || opr->is_constant() || opr->is_illegal(), "asumption: Constant instructions have only constant operands"); | |
| 532 assert(con != NULL || opr->is_virtual(), "asumption: non-Constant instructions have only virtual operands"); | |
| 533 | |
| 534 if ((con == NULL || con->is_pinned()) && opr->is_register()) { | |
| 535 assert(reg_num(opr) == opr->vreg_number() && !is_valid_reg_num(reg_numHi(opr)), "invalid optimization below"); | |
| 536 int reg = opr->vreg_number(); | |
| 537 if (!live_kill.at(reg)) { | |
| 538 live_gen.set_bit(reg); | |
| 539 TRACE_LINEAR_SCAN(4, tty->print_cr(" Setting live_gen for value %c%d, LIR op_id %d, register number %d", value->type()->tchar(), value->id(), op->id(), reg)); | |
| 540 } | |
| 541 } | |
| 542 } | |
| 543 | |
| 544 | |
| 545 void LinearScan::compute_local_live_sets() { | |
| 546 TIME_LINEAR_SCAN(timer_compute_local_live_sets); | |
| 547 | |
| 548 int num_blocks = block_count(); | |
| 549 int live_size = live_set_size(); | |
| 550 bool local_has_fpu_registers = false; | |
| 551 int local_num_calls = 0; | |
| 552 LIR_OpVisitState visitor; | |
| 553 | |
| 554 BitMap2D local_interval_in_loop = BitMap2D(_num_virtual_regs, num_loops()); | |
| 555 local_interval_in_loop.clear(); | |
| 556 | |
| 557 // iterate all blocks | |
| 558 for (int i = 0; i < num_blocks; i++) { | |
| 559 BlockBegin* block = block_at(i); | |
| 560 | |
| 561 BitMap live_gen(live_size); live_gen.clear(); | |
| 562 BitMap live_kill(live_size); live_kill.clear(); | |
| 563 | |
| 564 if (block->is_set(BlockBegin::exception_entry_flag)) { | |
| 565 // Phi functions at the begin of an exception handler are | |
| 566 // implicitly defined (= killed) at the beginning of the block. | |
| 567 for_each_phi_fun(block, phi, | |
| 568 live_kill.set_bit(phi->operand()->vreg_number()) | |
| 569 ); | |
| 570 } | |
| 571 | |
| 572 LIR_OpList* instructions = block->lir()->instructions_list(); | |
| 573 int num_inst = instructions->length(); | |
| 574 | |
| 575 // iterate all instructions of the block. skip the first because it is always a label | |
| 576 assert(visitor.no_operands(instructions->at(0)), "first operation must always be a label"); | |
| 577 for (int j = 1; j < num_inst; j++) { | |
| 578 LIR_Op* op = instructions->at(j); | |
| 579 | |
| 580 // visit operation to collect all operands | |
| 581 visitor.visit(op); | |
| 582 | |
| 583 if (visitor.has_call()) { | |
| 584 _has_call.set_bit(op->id() >> 1); | |
| 585 local_num_calls++; | |
| 586 } | |
| 587 if (visitor.info_count() > 0) { | |
| 588 _has_info.set_bit(op->id() >> 1); | |
| 589 } | |
| 590 | |
| 591 // iterate input operands of instruction | |
| 592 int k, n, reg; | |
| 593 n = visitor.opr_count(LIR_OpVisitState::inputMode); | |
| 594 for (k = 0; k < n; k++) { | |
| 595 LIR_Opr opr = visitor.opr_at(LIR_OpVisitState::inputMode, k); | |
| 596 assert(opr->is_register(), "visitor should only return register operands"); | |
| 597 | |
| 598 if (opr->is_virtual_register()) { | |
| 599 assert(reg_num(opr) == opr->vreg_number() && !is_valid_reg_num(reg_numHi(opr)), "invalid optimization below"); | |
| 600 reg = opr->vreg_number(); | |
| 601 if (!live_kill.at(reg)) { | |
| 602 live_gen.set_bit(reg); | |
| 603 TRACE_LINEAR_SCAN(4, tty->print_cr(" Setting live_gen for register %d at instruction %d", reg, op->id())); | |
| 604 } | |
| 605 if (block->loop_index() >= 0) { | |
| 606 local_interval_in_loop.set_bit(reg, block->loop_index()); | |
| 607 } | |
| 608 local_has_fpu_registers = local_has_fpu_registers || opr->is_virtual_fpu(); | |
| 609 } | |
| 610 | |
| 611 #ifdef ASSERT | |
| 612 // fixed intervals are never live at block boundaries, so | |
| 613 // they need not be processed in live sets. | |
| 614 // this is checked by these assertions to be sure about it. | |
| 615 // the entry block may have incoming values in registers, which is ok. | |
| 616 if (!opr->is_virtual_register() && block != ir()->start()) { | |
| 617 reg = reg_num(opr); | |
| 618 if (is_processed_reg_num(reg)) { | |
| 619 assert(live_kill.at(reg), "using fixed register that is not defined in this block"); | |
| 620 } | |
| 621 reg = reg_numHi(opr); | |
| 622 if (is_valid_reg_num(reg) && is_processed_reg_num(reg)) { | |
| 623 assert(live_kill.at(reg), "using fixed register that is not defined in this block"); | |
| 624 } | |
| 625 } | |
| 626 #endif | |
| 627 } | |
| 628 | |
| 629 // Add uses of live locals from interpreter's point of view for proper debug information generation | |
| 630 n = visitor.info_count(); | |
| 631 for (k = 0; k < n; k++) { | |
| 632 CodeEmitInfo* info = visitor.info_at(k); | |
| 633 ValueStack* stack = info->stack(); | |
| 634 for_each_state_value(stack, value, | |
| 635 set_live_gen_kill(value, op, live_gen, live_kill) | |
| 636 ); | |
| 637 } | |
| 638 | |
| 639 // iterate temp operands of instruction | |
| 640 n = visitor.opr_count(LIR_OpVisitState::tempMode); | |
| 641 for (k = 0; k < n; k++) { | |
| 642 LIR_Opr opr = visitor.opr_at(LIR_OpVisitState::tempMode, k); | |
| 643 assert(opr->is_register(), "visitor should only return register operands"); | |
| 644 | |
| 645 if (opr->is_virtual_register()) { | |
| 646 assert(reg_num(opr) == opr->vreg_number() && !is_valid_reg_num(reg_numHi(opr)), "invalid optimization below"); | |
| 647 reg = opr->vreg_number(); | |
| 648 live_kill.set_bit(reg); | |
| 649 if (block->loop_index() >= 0) { | |
| 650 local_interval_in_loop.set_bit(reg, block->loop_index()); | |
| 651 } | |
| 652 local_has_fpu_registers = local_has_fpu_registers || opr->is_virtual_fpu(); | |
| 653 } | |
| 654 | |
| 655 #ifdef ASSERT | |
| 656 // fixed intervals are never live at block boundaries, so | |
| 657 // they need not be processed in live sets | |
| 658 // process them only in debug mode so that this can be checked | |
| 659 if (!opr->is_virtual_register()) { | |
| 660 reg = reg_num(opr); | |
| 661 if (is_processed_reg_num(reg)) { | |
| 662 live_kill.set_bit(reg_num(opr)); | |
| 663 } | |
| 664 reg = reg_numHi(opr); | |
| 665 if (is_valid_reg_num(reg) && is_processed_reg_num(reg)) { | |
| 666 live_kill.set_bit(reg); | |
| 667 } | |
| 668 } | |
| 669 #endif | |
| 670 } | |
| 671 | |
| 672 // iterate output operands of instruction | |
| 673 n = visitor.opr_count(LIR_OpVisitState::outputMode); | |
| 674 for (k = 0; k < n; k++) { | |
| 675 LIR_Opr opr = visitor.opr_at(LIR_OpVisitState::outputMode, k); | |
| 676 assert(opr->is_register(), "visitor should only return register operands"); | |
| 677 | |
| 678 if (opr->is_virtual_register()) { | |
| 679 assert(reg_num(opr) == opr->vreg_number() && !is_valid_reg_num(reg_numHi(opr)), "invalid optimization below"); | |
| 680 reg = opr->vreg_number(); | |
| 681 live_kill.set_bit(reg); | |
| 682 if (block->loop_index() >= 0) { | |
| 683 local_interval_in_loop.set_bit(reg, block->loop_index()); | |
| 684 } | |
| 685 local_has_fpu_registers = local_has_fpu_registers || opr->is_virtual_fpu(); | |
| 686 } | |
| 687 | |
| 688 #ifdef ASSERT | |
| 689 // fixed intervals are never live at block boundaries, so | |
| 690 // they need not be processed in live sets | |
| 691 // process them only in debug mode so that this can be checked | |
| 692 if (!opr->is_virtual_register()) { | |
| 693 reg = reg_num(opr); | |
| 694 if (is_processed_reg_num(reg)) { | |
| 695 live_kill.set_bit(reg_num(opr)); | |
| 696 } | |
| 697 reg = reg_numHi(opr); | |
| 698 if (is_valid_reg_num(reg) && is_processed_reg_num(reg)) { | |
| 699 live_kill.set_bit(reg); | |
| 700 } | |
| 701 } | |
| 702 #endif | |
| 703 } | |
| 704 } // end of instruction iteration | |
| 705 | |
| 706 block->set_live_gen (live_gen); | |
| 707 block->set_live_kill(live_kill); | |
| 708 block->set_live_in (BitMap(live_size)); block->live_in().clear(); | |
| 709 block->set_live_out (BitMap(live_size)); block->live_out().clear(); | |
| 710 | |
| 711 TRACE_LINEAR_SCAN(4, tty->print("live_gen B%d ", block->block_id()); print_bitmap(block->live_gen())); | |
| 712 TRACE_LINEAR_SCAN(4, tty->print("live_kill B%d ", block->block_id()); print_bitmap(block->live_kill())); | |
| 713 } // end of block iteration | |
| 714 | |
| 715 // propagate local calculated information into LinearScan object | |
| 716 _has_fpu_registers = local_has_fpu_registers; | |
| 717 compilation()->set_has_fpu_code(local_has_fpu_registers); | |
| 718 | |
| 719 _num_calls = local_num_calls; | |
| 720 _interval_in_loop = local_interval_in_loop; | |
| 721 } | |
| 722 | |
| 723 | |
| 724 // ********** Phase 3: perform a backward dataflow analysis to compute global live sets | |
| 725 // (sets live_in and live_out for each block) | |
| 726 | |
| 727 void LinearScan::compute_global_live_sets() { | |
| 728 TIME_LINEAR_SCAN(timer_compute_global_live_sets); | |
| 729 | |
| 730 int num_blocks = block_count(); | |
| 731 bool change_occurred; | |
| 732 bool change_occurred_in_block; | |
| 733 int iteration_count = 0; | |
| 734 BitMap live_out(live_set_size()); live_out.clear(); // scratch set for calculations | |
| 735 | |
| 736 // Perform a backward dataflow analysis to compute live_out and live_in for each block. | |
| 737 // The loop is executed until a fixpoint is reached (no changes in an iteration) | |
| 738 // Exception handlers must be processed because not all live values are | |
| 739 // present in the state array, e.g. because of global value numbering | |
| 740 do { | |
| 741 change_occurred = false; | |
| 742 | |
| 743 // iterate all blocks in reverse order | |
| 744 for (int i = num_blocks - 1; i >= 0; i--) { | |
| 745 BlockBegin* block = block_at(i); | |
| 746 | |
| 747 change_occurred_in_block = false; | |
| 748 | |
| 749 // live_out(block) is the union of live_in(sux), for successors sux of block | |
| 750 int n = block->number_of_sux(); | |
| 751 int e = block->number_of_exception_handlers(); | |
| 752 if (n + e > 0) { | |
| 753 // block has successors | |
| 754 if (n > 0) { | |
| 755 live_out.set_from(block->sux_at(0)->live_in()); | |
| 756 for (int j = 1; j < n; j++) { | |
| 757 live_out.set_union(block->sux_at(j)->live_in()); | |
| 758 } | |
| 759 } else { | |
| 760 live_out.clear(); | |
| 761 } | |
| 762 for (int j = 0; j < e; j++) { | |
| 763 live_out.set_union(block->exception_handler_at(j)->live_in()); | |
| 764 } | |
| 765 | |
| 766 if (!block->live_out().is_same(live_out)) { | |
| 767 // A change occurred. Swap the old and new live out sets to avoid copying. | |
| 768 BitMap temp = block->live_out(); | |
| 769 block->set_live_out(live_out); | |
| 770 live_out = temp; | |
| 771 | |
| 772 change_occurred = true; | |
| 773 change_occurred_in_block = true; | |
| 774 } | |
| 775 } | |
| 776 | |
| 777 if (iteration_count == 0 || change_occurred_in_block) { | |
| 778 // live_in(block) is the union of live_gen(block) with (live_out(block) & !live_kill(block)) | |
| 779 // note: live_in has to be computed only in first iteration or if live_out has changed! | |
| 780 BitMap live_in = block->live_in(); | |
| 781 live_in.set_from(block->live_out()); | |
| 782 live_in.set_difference(block->live_kill()); | |
| 783 live_in.set_union(block->live_gen()); | |
| 784 } | |
| 785 | |
| 786 #ifndef PRODUCT | |
| 787 if (TraceLinearScanLevel >= 4) { | |
| 788 char c = ' '; | |
| 789 if (iteration_count == 0 || change_occurred_in_block) { | |
| 790 c = '*'; | |
| 791 } | |
| 792 tty->print("(%d) live_in%c B%d ", iteration_count, c, block->block_id()); print_bitmap(block->live_in()); | |
| 793 tty->print("(%d) live_out%c B%d ", iteration_count, c, block->block_id()); print_bitmap(block->live_out()); | |
| 794 } | |
| 795 #endif | |
| 796 } | |
| 797 iteration_count++; | |
| 798 | |
| 799 if (change_occurred && iteration_count > 50) { | |
| 800 BAILOUT("too many iterations in compute_global_live_sets"); | |
| 801 } | |
| 802 } while (change_occurred); | |
| 803 | |
| 804 | |
| 805 #ifdef ASSERT | |
| 806 // check that fixed intervals are not live at block boundaries | |
| 807 // (live set must be empty at fixed intervals) | |
| 808 for (int i = 0; i < num_blocks; i++) { | |
| 809 BlockBegin* block = block_at(i); | |
| 810 for (int j = 0; j < LIR_OprDesc::vreg_base; j++) { | |
| 811 assert(block->live_in().at(j) == false, "live_in set of fixed register must be empty"); | |
| 812 assert(block->live_out().at(j) == false, "live_out set of fixed register must be empty"); | |
| 813 assert(block->live_gen().at(j) == false, "live_gen set of fixed register must be empty"); | |
| 814 } | |
| 815 } | |
| 816 #endif | |
| 817 | |
| 818 // check that the live_in set of the first block is empty | |
| 819 BitMap live_in_args(ir()->start()->live_in().size()); | |
| 820 live_in_args.clear(); | |
| 821 if (!ir()->start()->live_in().is_same(live_in_args)) { | |
| 822 #ifdef ASSERT | |
| 823 tty->print_cr("Error: live_in set of first block must be empty (when this fails, virtual registers are used before they are defined)"); | |
| 824 tty->print_cr("affected registers:"); | |
| 825 print_bitmap(ir()->start()->live_in()); | |
| 826 | |
| 827 // print some additional information to simplify debugging | |
| 828 for (unsigned int i = 0; i < ir()->start()->live_in().size(); i++) { | |
| 829 if (ir()->start()->live_in().at(i)) { | |
| 830 Instruction* instr = gen()->instruction_for_vreg(i); | |
| 831 tty->print_cr("* vreg %d (HIR instruction %c%d)", i, instr == NULL ? ' ' : instr->type()->tchar(), instr == NULL ? 0 : instr->id()); | |
| 832 | |
| 833 for (int j = 0; j < num_blocks; j++) { | |
| 834 BlockBegin* block = block_at(j); | |
| 835 if (block->live_gen().at(i)) { | |
| 836 tty->print_cr(" used in block B%d", block->block_id()); | |
| 837 } | |
| 838 if (block->live_kill().at(i)) { | |
| 839 tty->print_cr(" defined in block B%d", block->block_id()); | |
| 840 } | |
| 841 } | |
| 842 } | |
| 843 } | |
| 844 | |
| 845 #endif | |
| 846 // when this fails, virtual registers are used before they are defined. | |
| 847 assert(false, "live_in set of first block must be empty"); | |
| 848 // bailout of if this occurs in product mode. | |
| 849 bailout("live_in set of first block not empty"); | |
| 850 } | |
| 851 } | |
| 852 | |
| 853 | |
| 854 // ********** Phase 4: build intervals | |
| 855 // (fills the list _intervals) | |
| 856 | |
| 857 void LinearScan::add_use(Value value, int from, int to, IntervalUseKind use_kind) { | |
| 858 assert(!value->type()->is_illegal(), "if this value is used by the interpreter it shouldn't be of indeterminate type"); | |
| 859 LIR_Opr opr = value->operand(); | |
| 860 Constant* con = value->as_Constant(); | |
| 861 | |
| 862 if ((con == NULL || con->is_pinned()) && opr->is_register()) { | |
| 863 assert(reg_num(opr) == opr->vreg_number() && !is_valid_reg_num(reg_numHi(opr)), "invalid optimization below"); | |
| 864 add_use(opr, from, to, use_kind); | |
| 865 } | |
| 866 } | |
| 867 | |
| 868 | |
| 869 void LinearScan::add_def(LIR_Opr opr, int def_pos, IntervalUseKind use_kind) { | |
| 870 TRACE_LINEAR_SCAN(2, tty->print(" def "); opr->print(tty); tty->print_cr(" def_pos %d (%d)", def_pos, use_kind)); | |
| 871 assert(opr->is_register(), "should not be called otherwise"); | |
| 872 | |
| 873 if (opr->is_virtual_register()) { | |
| 874 assert(reg_num(opr) == opr->vreg_number() && !is_valid_reg_num(reg_numHi(opr)), "invalid optimization below"); | |
| 875 add_def(opr->vreg_number(), def_pos, use_kind, opr->type_register()); | |
| 876 | |
| 877 } else { | |
| 878 int reg = reg_num(opr); | |
| 879 if (is_processed_reg_num(reg)) { | |
| 880 add_def(reg, def_pos, use_kind, opr->type_register()); | |
| 881 } | |
| 882 reg = reg_numHi(opr); | |
| 883 if (is_valid_reg_num(reg) && is_processed_reg_num(reg)) { | |
| 884 add_def(reg, def_pos, use_kind, opr->type_register()); | |
| 885 } | |
| 886 } | |
| 887 } | |
| 888 | |
| 889 void LinearScan::add_use(LIR_Opr opr, int from, int to, IntervalUseKind use_kind) { | |
| 890 TRACE_LINEAR_SCAN(2, tty->print(" use "); opr->print(tty); tty->print_cr(" from %d to %d (%d)", from, to, use_kind)); | |
| 891 assert(opr->is_register(), "should not be called otherwise"); | |
| 892 | |
| 893 if (opr->is_virtual_register()) { | |
| 894 assert(reg_num(opr) == opr->vreg_number() && !is_valid_reg_num(reg_numHi(opr)), "invalid optimization below"); | |
| 895 add_use(opr->vreg_number(), from, to, use_kind, opr->type_register()); | |
| 896 | |
| 897 } else { | |
| 898 int reg = reg_num(opr); | |
| 899 if (is_processed_reg_num(reg)) { | |
| 900 add_use(reg, from, to, use_kind, opr->type_register()); | |
| 901 } | |
| 902 reg = reg_numHi(opr); | |
| 903 if (is_valid_reg_num(reg) && is_processed_reg_num(reg)) { | |
| 904 add_use(reg, from, to, use_kind, opr->type_register()); | |
| 905 } | |
| 906 } | |
| 907 } | |
| 908 | |
| 909 void LinearScan::add_temp(LIR_Opr opr, int temp_pos, IntervalUseKind use_kind) { | |
| 910 TRACE_LINEAR_SCAN(2, tty->print(" temp "); opr->print(tty); tty->print_cr(" temp_pos %d (%d)", temp_pos, use_kind)); | |
| 911 assert(opr->is_register(), "should not be called otherwise"); | |
| 912 | |
| 913 if (opr->is_virtual_register()) { | |
| 914 assert(reg_num(opr) == opr->vreg_number() && !is_valid_reg_num(reg_numHi(opr)), "invalid optimization below"); | |
| 915 add_temp(opr->vreg_number(), temp_pos, use_kind, opr->type_register()); | |
| 916 | |
| 917 } else { | |
| 918 int reg = reg_num(opr); | |
| 919 if (is_processed_reg_num(reg)) { | |
| 920 add_temp(reg, temp_pos, use_kind, opr->type_register()); | |
| 921 } | |
| 922 reg = reg_numHi(opr); | |
| 923 if (is_valid_reg_num(reg) && is_processed_reg_num(reg)) { | |
| 924 add_temp(reg, temp_pos, use_kind, opr->type_register()); | |
| 925 } | |
| 926 } | |
| 927 } | |
| 928 | |
| 929 | |
| 930 void LinearScan::add_def(int reg_num, int def_pos, IntervalUseKind use_kind, BasicType type) { | |
| 931 Interval* interval = interval_at(reg_num); | |
| 932 if (interval != NULL) { | |
| 933 assert(interval->reg_num() == reg_num, "wrong interval"); | |
| 934 | |
| 935 if (type != T_ILLEGAL) { | |
| 936 interval->set_type(type); | |
| 937 } | |
| 938 | |
| 939 Range* r = interval->first(); | |
| 940 if (r->from() <= def_pos) { | |
| 941 // Update the starting point (when a range is first created for a use, its | |
| 942 // start is the beginning of the current block until a def is encountered.) | |
| 943 r->set_from(def_pos); | |
| 944 interval->add_use_pos(def_pos, use_kind); | |
| 945 | |
| 946 } else { | |
| 947 // Dead value - make vacuous interval | |
| 948 // also add use_kind for dead intervals | |
| 949 interval->add_range(def_pos, def_pos + 1); | |
| 950 interval->add_use_pos(def_pos, use_kind); | |
| 951 TRACE_LINEAR_SCAN(2, tty->print_cr("Warning: def of reg %d at %d occurs without use", reg_num, def_pos)); | |
| 952 } | |
| 953 | |
| 954 } else { | |
| 955 // Dead value - make vacuous interval | |
| 956 // also add use_kind for dead intervals | |
| 957 interval = create_interval(reg_num); | |
| 958 if (type != T_ILLEGAL) { | |
| 959 interval->set_type(type); | |
| 960 } | |
| 961 | |
| 962 interval->add_range(def_pos, def_pos + 1); | |
| 963 interval->add_use_pos(def_pos, use_kind); | |
| 964 TRACE_LINEAR_SCAN(2, tty->print_cr("Warning: dead value %d at %d in live intervals", reg_num, def_pos)); | |
| 965 } | |
| 966 | |
| 967 change_spill_definition_pos(interval, def_pos); | |
| 968 if (use_kind == noUse && interval->spill_state() <= startInMemory) { | |
| 969 // detection of method-parameters and roundfp-results | |
| 970 // TODO: move this directly to position where use-kind is computed | |
| 971 interval->set_spill_state(startInMemory); | |
| 972 } | |
| 973 } | |
| 974 | |
| 975 void LinearScan::add_use(int reg_num, int from, int to, IntervalUseKind use_kind, BasicType type) { | |
| 976 Interval* interval = interval_at(reg_num); | |
| 977 if (interval == NULL) { | |
| 978 interval = create_interval(reg_num); | |
| 979 } | |
| 980 assert(interval->reg_num() == reg_num, "wrong interval"); | |
| 981 | |
| 982 if (type != T_ILLEGAL) { | |
| 983 interval->set_type(type); | |
| 984 } | |
| 985 | |
| 986 interval->add_range(from, to); | |
| 987 interval->add_use_pos(to, use_kind); | |
| 988 } | |
| 989 | |
| 990 void LinearScan::add_temp(int reg_num, int temp_pos, IntervalUseKind use_kind, BasicType type) { | |
| 991 Interval* interval = interval_at(reg_num); | |
| 992 if (interval == NULL) { | |
| 993 interval = create_interval(reg_num); | |
| 994 } | |
| 995 assert(interval->reg_num() == reg_num, "wrong interval"); | |
| 996 | |
| 997 if (type != T_ILLEGAL) { | |
| 998 interval->set_type(type); | |
| 999 } | |
| 1000 | |
| 1001 interval->add_range(temp_pos, temp_pos + 1); | |
| 1002 interval->add_use_pos(temp_pos, use_kind); | |
| 1003 } | |
| 1004 | |
| 1005 | |
| 1006 // the results of this functions are used for optimizing spilling and reloading | |
| 1007 // if the functions return shouldHaveRegister and the interval is spilled, | |
| 1008 // it is not reloaded to a register. | |
| 1009 IntervalUseKind LinearScan::use_kind_of_output_operand(LIR_Op* op, LIR_Opr opr) { | |
| 1010 if (op->code() == lir_move) { | |
| 1011 assert(op->as_Op1() != NULL, "lir_move must be LIR_Op1"); | |
| 1012 LIR_Op1* move = (LIR_Op1*)op; | |
| 1013 LIR_Opr res = move->result_opr(); | |
| 1014 bool result_in_memory = res->is_virtual() && gen()->is_vreg_flag_set(res->vreg_number(), LIRGenerator::must_start_in_memory); | |
| 1015 | |
| 1016 if (result_in_memory) { | |
| 1017 // Begin of an interval with must_start_in_memory set. | |
| 1018 // This interval will always get a stack slot first, so return noUse. | |
| 1019 return noUse; | |
| 1020 | |
| 1021 } else if (move->in_opr()->is_stack()) { | |
| 1022 // method argument (condition must be equal to handle_method_arguments) | |
| 1023 return noUse; | |
| 1024 | |
| 1025 } else if (move->in_opr()->is_register() && move->result_opr()->is_register()) { | |
| 1026 // Move from register to register | |
| 1027 if (block_of_op_with_id(op->id())->is_set(BlockBegin::osr_entry_flag)) { | |
| 1028 // special handling of phi-function moves inside osr-entry blocks | |
| 1029 // input operand must have a register instead of output operand (leads to better register allocation) | |
| 1030 return shouldHaveRegister; | |
| 1031 } | |
| 1032 } | |
| 1033 } | |
| 1034 | |
| 1035 if (opr->is_virtual() && | |
| 1036 gen()->is_vreg_flag_set(opr->vreg_number(), LIRGenerator::must_start_in_memory)) { | |
| 1037 // result is a stack-slot, so prevent immediate reloading | |
| 1038 return noUse; | |
| 1039 } | |
| 1040 | |
| 1041 // all other operands require a register | |
| 1042 return mustHaveRegister; | |
| 1043 } | |
| 1044 | |
| 1045 IntervalUseKind LinearScan::use_kind_of_input_operand(LIR_Op* op, LIR_Opr opr) { | |
| 1046 if (op->code() == lir_move) { | |
| 1047 assert(op->as_Op1() != NULL, "lir_move must be LIR_Op1"); | |
| 1048 LIR_Op1* move = (LIR_Op1*)op; | |
| 1049 LIR_Opr res = move->result_opr(); | |
| 1050 bool result_in_memory = res->is_virtual() && gen()->is_vreg_flag_set(res->vreg_number(), LIRGenerator::must_start_in_memory); | |
| 1051 | |
| 1052 if (result_in_memory) { | |
| 1053 // Move to an interval with must_start_in_memory set. | |
| 1054 // To avoid moves from stack to stack (not allowed) force the input operand to a register | |
| 1055 return mustHaveRegister; | |
| 1056 | |
| 1057 } else if (move->in_opr()->is_register() && move->result_opr()->is_register()) { | |
| 1058 // Move from register to register | |
| 1059 if (block_of_op_with_id(op->id())->is_set(BlockBegin::osr_entry_flag)) { | |
| 1060 // special handling of phi-function moves inside osr-entry blocks | |
| 1061 // input operand must have a register instead of output operand (leads to better register allocation) | |
| 1062 return mustHaveRegister; | |
| 1063 } | |
| 1064 | |
| 1065 // The input operand is not forced to a register (moves from stack to register are allowed), | |
| 1066 // but it is faster if the input operand is in a register | |
| 1067 return shouldHaveRegister; | |
| 1068 } | |
| 1069 } | |
| 1070 | |
| 1071 | |
| 304 | 1072 #ifdef X86 |
| 0 | 1073 if (op->code() == lir_cmove) { |
| 1074 // conditional moves can handle stack operands | |
| 1075 assert(op->result_opr()->is_register(), "result must always be in a register"); | |
| 1076 return shouldHaveRegister; | |
| 1077 } | |
| 1078 | |
| 1079 // optimizations for second input operand of arithmehtic operations on Intel | |
| 1080 // this operand is allowed to be on the stack in some cases | |
| 1081 BasicType opr_type = opr->type_register(); | |
| 1082 if (opr_type == T_FLOAT || opr_type == T_DOUBLE) { | |
| 1083 if ((UseSSE == 1 && opr_type == T_FLOAT) || UseSSE >= 2) { | |
| 1084 // SSE float instruction (T_DOUBLE only supported with SSE2) | |
| 1085 switch (op->code()) { | |
| 1086 case lir_cmp: | |
| 1087 case lir_add: | |
| 1088 case lir_sub: | |
| 1089 case lir_mul: | |
| 1090 case lir_div: | |
| 1091 { | |
| 1092 assert(op->as_Op2() != NULL, "must be LIR_Op2"); | |
| 1093 LIR_Op2* op2 = (LIR_Op2*)op; | |
| 1094 if (op2->in_opr1() != op2->in_opr2() && op2->in_opr2() == opr) { | |
| 1095 assert((op2->result_opr()->is_register() || op->code() == lir_cmp) && op2->in_opr1()->is_register(), "cannot mark second operand as stack if others are not in register"); | |
| 1096 return shouldHaveRegister; | |
| 1097 } | |
| 1098 } | |
| 1099 } | |
| 1100 } else { | |
| 1101 // FPU stack float instruction | |
| 1102 switch (op->code()) { | |
| 1103 case lir_add: | |
| 1104 case lir_sub: | |
| 1105 case lir_mul: | |
| 1106 case lir_div: | |
| 1107 { | |
| 1108 assert(op->as_Op2() != NULL, "must be LIR_Op2"); | |
| 1109 LIR_Op2* op2 = (LIR_Op2*)op; | |
| 1110 if (op2->in_opr1() != op2->in_opr2() && op2->in_opr2() == opr) { | |
| 1111 assert((op2->result_opr()->is_register() || op->code() == lir_cmp) && op2->in_opr1()->is_register(), "cannot mark second operand as stack if others are not in register"); | |
| 1112 return shouldHaveRegister; | |
| 1113 } | |
| 1114 } | |
| 1115 } | |
| 1116 } | |
| 1117 | |
| 1118 } else if (opr_type != T_LONG) { | |
| 1119 // integer instruction (note: long operands must always be in register) | |
| 1120 switch (op->code()) { | |
| 1121 case lir_cmp: | |
| 1122 case lir_add: | |
| 1123 case lir_sub: | |
| 1124 case lir_logic_and: | |
| 1125 case lir_logic_or: | |
| 1126 case lir_logic_xor: | |
| 1127 { | |
| 1128 assert(op->as_Op2() != NULL, "must be LIR_Op2"); | |
| 1129 LIR_Op2* op2 = (LIR_Op2*)op; | |
| 1130 if (op2->in_opr1() != op2->in_opr2() && op2->in_opr2() == opr) { | |
| 1131 assert((op2->result_opr()->is_register() || op->code() == lir_cmp) && op2->in_opr1()->is_register(), "cannot mark second operand as stack if others are not in register"); | |
| 1132 return shouldHaveRegister; | |
| 1133 } | |
| 1134 } | |
| 1135 } | |
| 1136 } | |
| 304 | 1137 #endif // X86 |
| 0 | 1138 |
| 1139 // all other operands require a register | |
| 1140 return mustHaveRegister; | |
| 1141 } | |
| 1142 | |
| 1143 | |
| 1144 void LinearScan::handle_method_arguments(LIR_Op* op) { | |
| 1145 // special handling for method arguments (moves from stack to virtual register): | |
| 1146 // the interval gets no register assigned, but the stack slot. | |
| 1147 // it is split before the first use by the register allocator. | |
| 1148 | |
| 1149 if (op->code() == lir_move) { | |
| 1150 assert(op->as_Op1() != NULL, "must be LIR_Op1"); | |
| 1151 LIR_Op1* move = (LIR_Op1*)op; | |
| 1152 | |
| 1153 if (move->in_opr()->is_stack()) { | |
| 1154 #ifdef ASSERT | |
| 1155 int arg_size = compilation()->method()->arg_size(); | |
| 1156 LIR_Opr o = move->in_opr(); | |
| 1157 if (o->is_single_stack()) { | |
| 1158 assert(o->single_stack_ix() >= 0 && o->single_stack_ix() < arg_size, "out of range"); | |
| 1159 } else if (o->is_double_stack()) { | |
| 1160 assert(o->double_stack_ix() >= 0 && o->double_stack_ix() < arg_size, "out of range"); | |
| 1161 } else { | |
| 1162 ShouldNotReachHere(); | |
| 1163 } | |
| 1164 | |
| 1165 assert(move->id() > 0, "invalid id"); | |
| 1166 assert(block_of_op_with_id(move->id())->number_of_preds() == 0, "move from stack must be in first block"); | |
| 1167 assert(move->result_opr()->is_virtual(), "result of move must be a virtual register"); | |
| 1168 | |
| 1169 TRACE_LINEAR_SCAN(4, tty->print_cr("found move from stack slot %d to vreg %d", o->is_single_stack() ? o->single_stack_ix() : o->double_stack_ix(), reg_num(move->result_opr()))); | |
| 1170 #endif | |
| 1171 | |
| 1172 Interval* interval = interval_at(reg_num(move->result_opr())); | |
| 1173 | |
| 1174 int stack_slot = LinearScan::nof_regs + (move->in_opr()->is_single_stack() ? move->in_opr()->single_stack_ix() : move->in_opr()->double_stack_ix()); | |
| 1175 interval->set_canonical_spill_slot(stack_slot); | |
| 1176 interval->assign_reg(stack_slot); | |
| 1177 } | |
| 1178 } | |
| 1179 } | |
| 1180 | |
| 1181 void LinearScan::handle_doubleword_moves(LIR_Op* op) { | |
| 1182 // special handling for doubleword move from memory to register: | |
| 1183 // in this case the registers of the input address and the result | |
| 1184 // registers must not overlap -> add a temp range for the input registers | |
| 1185 if (op->code() == lir_move) { | |
| 1186 assert(op->as_Op1() != NULL, "must be LIR_Op1"); | |
| 1187 LIR_Op1* move = (LIR_Op1*)op; | |
| 1188 | |
| 1189 if (move->result_opr()->is_double_cpu() && move->in_opr()->is_pointer()) { | |
| 1190 LIR_Address* address = move->in_opr()->as_address_ptr(); | |
| 1191 if (address != NULL) { | |
| 1192 if (address->base()->is_valid()) { | |
| 1193 add_temp(address->base(), op->id(), noUse); | |
| 1194 } | |
| 1195 if (address->index()->is_valid()) { | |
| 1196 add_temp(address->index(), op->id(), noUse); | |
| 1197 } | |
| 1198 } | |
| 1199 } | |
| 1200 } | |
| 1201 } | |
| 1202 | |
| 1203 void LinearScan::add_register_hints(LIR_Op* op) { | |
| 1204 switch (op->code()) { | |
| 1205 case lir_move: // fall through | |
| 1206 case lir_convert: { | |
| 1207 assert(op->as_Op1() != NULL, "lir_move, lir_convert must be LIR_Op1"); | |
| 1208 LIR_Op1* move = (LIR_Op1*)op; | |
| 1209 | |
| 1210 LIR_Opr move_from = move->in_opr(); | |
| 1211 LIR_Opr move_to = move->result_opr(); | |
| 1212 | |
| 1213 if (move_to->is_register() && move_from->is_register()) { | |
| 1214 Interval* from = interval_at(reg_num(move_from)); | |
| 1215 Interval* to = interval_at(reg_num(move_to)); | |
| 1216 if (from != NULL && to != NULL) { | |
| 1217 to->set_register_hint(from); | |
| 1218 TRACE_LINEAR_SCAN(4, tty->print_cr("operation at op_id %d: added hint from interval %d to %d", move->id(), from->reg_num(), to->reg_num())); | |
| 1219 } | |
| 1220 } | |
| 1221 break; | |
| 1222 } | |
| 1223 case lir_cmove: { | |
| 1224 assert(op->as_Op2() != NULL, "lir_cmove must be LIR_Op2"); | |
| 1225 LIR_Op2* cmove = (LIR_Op2*)op; | |
| 1226 | |
| 1227 LIR_Opr move_from = cmove->in_opr1(); | |
| 1228 LIR_Opr move_to = cmove->result_opr(); | |
| 1229 | |
| 1230 if (move_to->is_register() && move_from->is_register()) { | |
| 1231 Interval* from = interval_at(reg_num(move_from)); | |
| 1232 Interval* to = interval_at(reg_num(move_to)); | |
| 1233 if (from != NULL && to != NULL) { | |
| 1234 to->set_register_hint(from); | |
| 1235 TRACE_LINEAR_SCAN(4, tty->print_cr("operation at op_id %d: added hint from interval %d to %d", cmove->id(), from->reg_num(), to->reg_num())); | |
| 1236 } | |
| 1237 } | |
| 1238 break; | |
| 1239 } | |
| 1240 } | |
| 1241 } | |
| 1242 | |
| 1243 | |
| 1244 void LinearScan::build_intervals() { | |
| 1245 TIME_LINEAR_SCAN(timer_build_intervals); | |
| 1246 | |
| 1247 // initialize interval list with expected number of intervals | |
| 1248 // (32 is added to have some space for split children without having to resize the list) | |
| 1249 _intervals = IntervalList(num_virtual_regs() + 32); | |
| 1250 // initialize all slots that are used by build_intervals | |
| 1251 _intervals.at_put_grow(num_virtual_regs() - 1, NULL, NULL); | |
| 1252 | |
| 1253 // create a list with all caller-save registers (cpu, fpu, xmm) | |
| 1254 // when an instruction is a call, a temp range is created for all these registers | |
| 1255 int num_caller_save_registers = 0; | |
| 1256 int caller_save_registers[LinearScan::nof_regs]; | |
| 1257 | |
| 1258 int i; | |
| 1259 for (i = 0; i < FrameMap::nof_caller_save_cpu_regs; i++) { | |
| 1260 LIR_Opr opr = FrameMap::caller_save_cpu_reg_at(i); | |
| 1261 assert(opr->is_valid() && opr->is_register(), "FrameMap should not return invalid operands"); | |
| 1262 assert(reg_numHi(opr) == -1, "missing addition of range for hi-register"); | |
| 1263 caller_save_registers[num_caller_save_registers++] = reg_num(opr); | |
| 1264 } | |
| 1265 | |
| 1266 // temp ranges for fpu registers are only created when the method has | |
| 1267 // virtual fpu operands. Otherwise no allocation for fpu registers is | |
| 1268 // perfomed and so the temp ranges would be useless | |
| 1269 if (has_fpu_registers()) { | |
| 304 | 1270 #ifdef X86 |
| 0 | 1271 if (UseSSE < 2) { |
| 1272 #endif | |
| 1273 for (i = 0; i < FrameMap::nof_caller_save_fpu_regs; i++) { | |
| 1274 LIR_Opr opr = FrameMap::caller_save_fpu_reg_at(i); | |
| 1275 assert(opr->is_valid() && opr->is_register(), "FrameMap should not return invalid operands"); | |
| 1276 assert(reg_numHi(opr) == -1, "missing addition of range for hi-register"); | |
| 1277 caller_save_registers[num_caller_save_registers++] = reg_num(opr); | |
| 1278 } | |
| 304 | 1279 #ifdef X86 |
| 0 | 1280 } |
| 1281 if (UseSSE > 0) { | |
| 1282 for (i = 0; i < FrameMap::nof_caller_save_xmm_regs; i++) { | |
| 1283 LIR_Opr opr = FrameMap::caller_save_xmm_reg_at(i); | |
| 1284 assert(opr->is_valid() && opr->is_register(), "FrameMap should not return invalid operands"); | |
| 1285 assert(reg_numHi(opr) == -1, "missing addition of range for hi-register"); | |
| 1286 caller_save_registers[num_caller_save_registers++] = reg_num(opr); | |
| 1287 } | |
| 1288 } | |
| 1289 #endif | |
| 1290 } | |
| 1291 assert(num_caller_save_registers <= LinearScan::nof_regs, "out of bounds"); | |
| 1292 | |
| 1293 | |
| 1294 LIR_OpVisitState visitor; | |
| 1295 | |
| 1296 // iterate all blocks in reverse order | |
| 1297 for (i = block_count() - 1; i >= 0; i--) { | |
| 1298 BlockBegin* block = block_at(i); | |
| 1299 LIR_OpList* instructions = block->lir()->instructions_list(); | |
| 1300 int block_from = block->first_lir_instruction_id(); | |
| 1301 int block_to = block->last_lir_instruction_id(); | |
| 1302 | |
| 1303 assert(block_from == instructions->at(0)->id(), "must be"); | |
| 1304 assert(block_to == instructions->at(instructions->length() - 1)->id(), "must be"); | |
| 1305 | |
| 1306 // Update intervals for registers live at the end of this block; | |
| 1307 BitMap live = block->live_out(); | |
| 304 | 1308 int size = (int)live.size(); |
| 1309 for (int number = (int)live.get_next_one_offset(0, size); number < size; number = (int)live.get_next_one_offset(number + 1, size)) { | |
| 0 | 1310 assert(live.at(number), "should not stop here otherwise"); |
| 1311 assert(number >= LIR_OprDesc::vreg_base, "fixed intervals must not be live on block bounds"); | |
| 1312 TRACE_LINEAR_SCAN(2, tty->print_cr("live in %d to %d", number, block_to + 2)); | |
| 1313 | |
| 1314 add_use(number, block_from, block_to + 2, noUse, T_ILLEGAL); | |
| 1315 | |
| 1316 // add special use positions for loop-end blocks when the | |
| 1317 // interval is used anywhere inside this loop. It's possible | |
| 1318 // that the block was part of a non-natural loop, so it might | |
| 1319 // have an invalid loop index. | |
| 1320 if (block->is_set(BlockBegin::linear_scan_loop_end_flag) && | |
| 1321 block->loop_index() != -1 && | |
| 1322 is_interval_in_loop(number, block->loop_index())) { | |
| 1323 interval_at(number)->add_use_pos(block_to + 1, loopEndMarker); | |
| 1324 } | |
| 1325 } | |
| 1326 | |
| 1327 // iterate all instructions of the block in reverse order. | |
| 1328 // skip the first instruction because it is always a label | |
| 1329 // definitions of intervals are processed before uses | |
| 1330 assert(visitor.no_operands(instructions->at(0)), "first operation must always be a label"); | |
| 1331 for (int j = instructions->length() - 1; j >= 1; j--) { | |
| 1332 LIR_Op* op = instructions->at(j); | |
| 1333 int op_id = op->id(); | |
| 1334 | |
| 1335 // visit operation to collect all operands | |
| 1336 visitor.visit(op); | |
| 1337 | |
| 1338 // add a temp range for each register if operation destroys caller-save registers | |
| 1339 if (visitor.has_call()) { | |
| 1340 for (int k = 0; k < num_caller_save_registers; k++) { | |
| 1341 add_temp(caller_save_registers[k], op_id, noUse, T_ILLEGAL); | |
| 1342 } | |
| 1343 TRACE_LINEAR_SCAN(4, tty->print_cr("operation destroys all caller-save registers")); | |
| 1344 } | |
| 1345 | |
| 1346 // Add any platform dependent temps | |
| 1347 pd_add_temps(op); | |
| 1348 | |
| 1349 // visit definitions (output and temp operands) | |
| 1350 int k, n; | |
| 1351 n = visitor.opr_count(LIR_OpVisitState::outputMode); | |
| 1352 for (k = 0; k < n; k++) { | |
| 1353 LIR_Opr opr = visitor.opr_at(LIR_OpVisitState::outputMode, k); | |
| 1354 assert(opr->is_register(), "visitor should only return register operands"); | |
| 1355 add_def(opr, op_id, use_kind_of_output_operand(op, opr)); | |
| 1356 } | |
| 1357 | |
| 1358 n = visitor.opr_count(LIR_OpVisitState::tempMode); | |
| 1359 for (k = 0; k < n; k++) { | |
| 1360 LIR_Opr opr = visitor.opr_at(LIR_OpVisitState::tempMode, k); | |
| 1361 assert(opr->is_register(), "visitor should only return register operands"); | |
| 1362 add_temp(opr, op_id, mustHaveRegister); | |
| 1363 } | |
| 1364 | |
| 1365 // visit uses (input operands) | |
| 1366 n = visitor.opr_count(LIR_OpVisitState::inputMode); | |
| 1367 for (k = 0; k < n; k++) { | |
| 1368 LIR_Opr opr = visitor.opr_at(LIR_OpVisitState::inputMode, k); | |
| 1369 assert(opr->is_register(), "visitor should only return register operands"); | |
| 1370 add_use(opr, block_from, op_id, use_kind_of_input_operand(op, opr)); | |
| 1371 } | |
| 1372 | |
| 1373 // Add uses of live locals from interpreter's point of view for proper | |
| 1374 // debug information generation | |
| 1375 // Treat these operands as temp values (if the life range is extended | |
| 1376 // to a call site, the value would be in a register at the call otherwise) | |
| 1377 n = visitor.info_count(); | |
| 1378 for (k = 0; k < n; k++) { | |
| 1379 CodeEmitInfo* info = visitor.info_at(k); | |
| 1380 ValueStack* stack = info->stack(); | |
| 1381 for_each_state_value(stack, value, | |
| 1382 add_use(value, block_from, op_id + 1, noUse); | |
| 1383 ); | |
| 1384 } | |
| 1385 | |
| 1386 // special steps for some instructions (especially moves) | |
| 1387 handle_method_arguments(op); | |
| 1388 handle_doubleword_moves(op); | |
| 1389 add_register_hints(op); | |
| 1390 | |
| 1391 } // end of instruction iteration | |
| 1392 } // end of block iteration | |
| 1393 | |
| 1394 | |
| 1395 // add the range [0, 1[ to all fixed intervals | |
| 1396 // -> the register allocator need not handle unhandled fixed intervals | |
| 1397 for (int n = 0; n < LinearScan::nof_regs; n++) { | |
| 1398 Interval* interval = interval_at(n); | |
| 1399 if (interval != NULL) { | |
| 1400 interval->add_range(0, 1); | |
| 1401 } | |
| 1402 } | |
| 1403 } | |
| 1404 | |
| 1405 | |
| 1406 // ********** Phase 5: actual register allocation | |
| 1407 | |
| 1408 int LinearScan::interval_cmp(Interval** a, Interval** b) { | |
| 1409 if (*a != NULL) { | |
| 1410 if (*b != NULL) { | |
| 1411 return (*a)->from() - (*b)->from(); | |
| 1412 } else { | |
| 1413 return -1; | |
| 1414 } | |
| 1415 } else { | |
| 1416 if (*b != NULL) { | |
| 1417 return 1; | |
| 1418 } else { | |
| 1419 return 0; | |
| 1420 } | |
| 1421 } | |
| 1422 } | |
| 1423 | |
| 1424 #ifndef PRODUCT | |
| 1425 bool LinearScan::is_sorted(IntervalArray* intervals) { | |
| 1426 int from = -1; | |
| 1427 int i, j; | |
| 1428 for (i = 0; i < intervals->length(); i ++) { | |
| 1429 Interval* it = intervals->at(i); | |
| 1430 if (it != NULL) { | |
| 1431 if (from > it->from()) { | |
| 1432 assert(false, ""); | |
| 1433 return false; | |
| 1434 } | |
| 1435 from = it->from(); | |
| 1436 } | |
| 1437 } | |
| 1438 | |
| 1439 // check in both directions if sorted list and unsorted list contain same intervals | |
| 1440 for (i = 0; i < interval_count(); i++) { | |
| 1441 if (interval_at(i) != NULL) { | |
| 1442 int num_found = 0; | |
| 1443 for (j = 0; j < intervals->length(); j++) { | |
| 1444 if (interval_at(i) == intervals->at(j)) { | |
| 1445 num_found++; | |
| 1446 } | |
| 1447 } | |
| 1448 assert(num_found == 1, "lists do not contain same intervals"); | |
| 1449 } | |
| 1450 } | |
| 1451 for (j = 0; j < intervals->length(); j++) { | |
| 1452 int num_found = 0; | |
| 1453 for (i = 0; i < interval_count(); i++) { | |
| 1454 if (interval_at(i) == intervals->at(j)) { | |
| 1455 num_found++; | |
| 1456 } | |
| 1457 } | |
| 1458 assert(num_found == 1, "lists do not contain same intervals"); | |
| 1459 } | |
| 1460 | |
| 1461 return true; | |
| 1462 } | |
| 1463 #endif | |
| 1464 | |
| 1465 void LinearScan::add_to_list(Interval** first, Interval** prev, Interval* interval) { | |
| 1466 if (*prev != NULL) { | |
| 1467 (*prev)->set_next(interval); | |
| 1468 } else { | |
| 1469 *first = interval; | |
| 1470 } | |
| 1471 *prev = interval; | |
| 1472 } | |
| 1473 | |
| 1474 void LinearScan::create_unhandled_lists(Interval** list1, Interval** list2, bool (is_list1)(const Interval* i), bool (is_list2)(const Interval* i)) { | |
| 1475 assert(is_sorted(_sorted_intervals), "interval list is not sorted"); | |
| 1476 | |
| 1477 *list1 = *list2 = Interval::end(); | |
| 1478 | |
| 1479 Interval* list1_prev = NULL; | |
| 1480 Interval* list2_prev = NULL; | |
| 1481 Interval* v; | |
| 1482 | |
| 1483 const int n = _sorted_intervals->length(); | |
| 1484 for (int i = 0; i < n; i++) { | |
| 1485 v = _sorted_intervals->at(i); | |
| 1486 if (v == NULL) continue; | |
| 1487 | |
| 1488 if (is_list1(v)) { | |
| 1489 add_to_list(list1, &list1_prev, v); | |
| 1490 } else if (is_list2 == NULL || is_list2(v)) { | |
| 1491 add_to_list(list2, &list2_prev, v); | |
| 1492 } | |
| 1493 } | |
| 1494 | |
| 1495 if (list1_prev != NULL) list1_prev->set_next(Interval::end()); | |
| 1496 if (list2_prev != NULL) list2_prev->set_next(Interval::end()); | |
| 1497 | |
| 1498 assert(list1_prev == NULL || list1_prev->next() == Interval::end(), "linear list ends not with sentinel"); | |
| 1499 assert(list2_prev == NULL || list2_prev->next() == Interval::end(), "linear list ends not with sentinel"); | |
| 1500 } | |
| 1501 | |
| 1502 | |
| 1503 void LinearScan::sort_intervals_before_allocation() { | |
| 1504 TIME_LINEAR_SCAN(timer_sort_intervals_before); | |
| 1505 | |
| 1506 IntervalList* unsorted_list = &_intervals; | |
| 1507 int unsorted_len = unsorted_list->length(); | |
| 1508 int sorted_len = 0; | |
| 1509 int unsorted_idx; | |
| 1510 int sorted_idx = 0; | |
| 1511 int sorted_from_max = -1; | |
| 1512 | |
| 1513 // calc number of items for sorted list (sorted list must not contain NULL values) | |
| 1514 for (unsorted_idx = 0; unsorted_idx < unsorted_len; unsorted_idx++) { | |
| 1515 if (unsorted_list->at(unsorted_idx) != NULL) { | |
| 1516 sorted_len++; | |
| 1517 } | |
| 1518 } | |
| 1519 IntervalArray* sorted_list = new IntervalArray(sorted_len); | |
| 1520 | |
| 1521 // special sorting algorithm: the original interval-list is almost sorted, | |
| 1522 // only some intervals are swapped. So this is much faster than a complete QuickSort | |
| 1523 for (unsorted_idx = 0; unsorted_idx < unsorted_len; unsorted_idx++) { | |
| 1524 Interval* cur_interval = unsorted_list->at(unsorted_idx); | |
| 1525 | |
| 1526 if (cur_interval != NULL) { | |
| 1527 int cur_from = cur_interval->from(); | |
| 1528 | |
| 1529 if (sorted_from_max <= cur_from) { | |
| 1530 sorted_list->at_put(sorted_idx++, cur_interval); | |
| 1531 sorted_from_max = cur_interval->from(); | |
| 1532 } else { | |
| 1533 // the asumption that the intervals are already sorted failed, | |
| 1534 // so this interval must be sorted in manually | |
| 1535 int j; | |
| 1536 for (j = sorted_idx - 1; j >= 0 && cur_from < sorted_list->at(j)->from(); j--) { | |
| 1537 sorted_list->at_put(j + 1, sorted_list->at(j)); | |
| 1538 } | |
| 1539 sorted_list->at_put(j + 1, cur_interval); | |
| 1540 sorted_idx++; | |
| 1541 } | |
| 1542 } | |
| 1543 } | |
| 1544 _sorted_intervals = sorted_list; | |
| 1545 } | |
| 1546 | |
| 1547 void LinearScan::sort_intervals_after_allocation() { | |
| 1548 TIME_LINEAR_SCAN(timer_sort_intervals_after); | |
| 1549 | |
| 1550 IntervalArray* old_list = _sorted_intervals; | |
| 1551 IntervalList* new_list = _new_intervals_from_allocation; | |
| 1552 int old_len = old_list->length(); | |
| 1553 int new_len = new_list->length(); | |
| 1554 | |
| 1555 if (new_len == 0) { | |
| 1556 // no intervals have been added during allocation, so sorted list is already up to date | |
| 1557 return; | |
| 1558 } | |
| 1559 | |
| 1560 // conventional sort-algorithm for new intervals | |
| 1561 new_list->sort(interval_cmp); | |
| 1562 | |
| 1563 // merge old and new list (both already sorted) into one combined list | |
| 1564 IntervalArray* combined_list = new IntervalArray(old_len + new_len); | |
| 1565 int old_idx = 0; | |
| 1566 int new_idx = 0; | |
| 1567 | |
| 1568 while (old_idx + new_idx < old_len + new_len) { | |
| 1569 if (new_idx >= new_len || (old_idx < old_len && old_list->at(old_idx)->from() <= new_list->at(new_idx)->from())) { | |
| 1570 combined_list->at_put(old_idx + new_idx, old_list->at(old_idx)); | |
| 1571 old_idx++; | |
| 1572 } else { | |
| 1573 combined_list->at_put(old_idx + new_idx, new_list->at(new_idx)); | |
| 1574 new_idx++; | |
| 1575 } | |
| 1576 } | |
| 1577 | |
| 1578 _sorted_intervals = combined_list; | |
| 1579 } | |
| 1580 | |
| 1581 | |
| 1582 void LinearScan::allocate_registers() { | |
| 1583 TIME_LINEAR_SCAN(timer_allocate_registers); | |
| 1584 | |
| 1585 Interval* precolored_cpu_intervals, *not_precolored_cpu_intervals; | |
| 1586 Interval* precolored_fpu_intervals, *not_precolored_fpu_intervals; | |
| 1587 | |
| 1588 create_unhandled_lists(&precolored_cpu_intervals, ¬_precolored_cpu_intervals, is_precolored_cpu_interval, is_virtual_cpu_interval); | |
| 1589 if (has_fpu_registers()) { | |
| 1590 create_unhandled_lists(&precolored_fpu_intervals, ¬_precolored_fpu_intervals, is_precolored_fpu_interval, is_virtual_fpu_interval); | |
| 1591 #ifdef ASSERT | |
| 1592 } else { | |
| 1593 // fpu register allocation is omitted because no virtual fpu registers are present | |
| 1594 // just check this again... | |
| 1595 create_unhandled_lists(&precolored_fpu_intervals, ¬_precolored_fpu_intervals, is_precolored_fpu_interval, is_virtual_fpu_interval); | |
| 1596 assert(not_precolored_fpu_intervals == Interval::end(), "missed an uncolored fpu interval"); | |
| 1597 #endif | |
| 1598 } | |
| 1599 | |
| 1600 // allocate cpu registers | |
| 1601 LinearScanWalker cpu_lsw(this, precolored_cpu_intervals, not_precolored_cpu_intervals); | |
| 1602 cpu_lsw.walk(); | |
| 1603 cpu_lsw.finish_allocation(); | |
| 1604 | |
| 1605 if (has_fpu_registers()) { | |
| 1606 // allocate fpu registers | |
| 1607 LinearScanWalker fpu_lsw(this, precolored_fpu_intervals, not_precolored_fpu_intervals); | |
| 1608 fpu_lsw.walk(); | |
| 1609 fpu_lsw.finish_allocation(); | |
| 1610 } | |
| 1611 } | |
| 1612 | |
| 1613 | |
| 1614 // ********** Phase 6: resolve data flow | |
| 1615 // (insert moves at edges between blocks if intervals have been split) | |
| 1616 | |
| 1617 // wrapper for Interval::split_child_at_op_id that performs a bailout in product mode | |
| 1618 // instead of returning NULL | |
| 1619 Interval* LinearScan::split_child_at_op_id(Interval* interval, int op_id, LIR_OpVisitState::OprMode mode) { | |
| 1620 Interval* result = interval->split_child_at_op_id(op_id, mode); | |
| 1621 if (result != NULL) { | |
| 1622 return result; | |
| 1623 } | |
| 1624 | |
| 1625 assert(false, "must find an interval, but do a clean bailout in product mode"); | |
| 1626 result = new Interval(LIR_OprDesc::vreg_base); | |
| 1627 result->assign_reg(0); | |
| 1628 result->set_type(T_INT); | |
| 1629 BAILOUT_("LinearScan: interval is NULL", result); | |
| 1630 } | |
| 1631 | |
| 1632 | |
| 1633 Interval* LinearScan::interval_at_block_begin(BlockBegin* block, int reg_num) { | |
| 1634 assert(LinearScan::nof_regs <= reg_num && reg_num < num_virtual_regs(), "register number out of bounds"); | |
| 1635 assert(interval_at(reg_num) != NULL, "no interval found"); | |
| 1636 | |
| 1637 return split_child_at_op_id(interval_at(reg_num), block->first_lir_instruction_id(), LIR_OpVisitState::outputMode); | |
| 1638 } | |
| 1639 | |
| 1640 Interval* LinearScan::interval_at_block_end(BlockBegin* block, int reg_num) { | |
| 1641 assert(LinearScan::nof_regs <= reg_num && reg_num < num_virtual_regs(), "register number out of bounds"); | |
| 1642 assert(interval_at(reg_num) != NULL, "no interval found"); | |
| 1643 | |
| 1644 return split_child_at_op_id(interval_at(reg_num), block->last_lir_instruction_id() + 1, LIR_OpVisitState::outputMode); | |
| 1645 } | |
| 1646 | |
| 1647 Interval* LinearScan::interval_at_op_id(int reg_num, int op_id) { | |
| 1648 assert(LinearScan::nof_regs <= reg_num && reg_num < num_virtual_regs(), "register number out of bounds"); | |
| 1649 assert(interval_at(reg_num) != NULL, "no interval found"); | |
| 1650 | |
| 1651 return split_child_at_op_id(interval_at(reg_num), op_id, LIR_OpVisitState::inputMode); | |
| 1652 } | |
| 1653 | |
| 1654 | |
| 1655 void LinearScan::resolve_collect_mappings(BlockBegin* from_block, BlockBegin* to_block, MoveResolver &move_resolver) { | |
| 1656 DEBUG_ONLY(move_resolver.check_empty()); | |
| 1657 | |
| 1658 const int num_regs = num_virtual_regs(); | |
| 1659 const int size = live_set_size(); | |
| 1660 const BitMap live_at_edge = to_block->live_in(); | |
| 1661 | |
| 1662 // visit all registers where the live_at_edge bit is set | |
| 304 | 1663 for (int r = (int)live_at_edge.get_next_one_offset(0, size); r < size; r = (int)live_at_edge.get_next_one_offset(r + 1, size)) { |
| 0 | 1664 assert(r < num_regs, "live information set for not exisiting interval"); |
| 1665 assert(from_block->live_out().at(r) && to_block->live_in().at(r), "interval not live at this edge"); | |
| 1666 | |
| 1667 Interval* from_interval = interval_at_block_end(from_block, r); | |
| 1668 Interval* to_interval = interval_at_block_begin(to_block, r); | |
| 1669 | |
| 1670 if (from_interval != to_interval && (from_interval->assigned_reg() != to_interval->assigned_reg() || from_interval->assigned_regHi() != to_interval->assigned_regHi())) { | |
| 1671 // need to insert move instruction | |
| 1672 move_resolver.add_mapping(from_interval, to_interval); | |
| 1673 } | |
| 1674 } | |
| 1675 } | |
| 1676 | |
| 1677 | |
| 1678 void LinearScan::resolve_find_insert_pos(BlockBegin* from_block, BlockBegin* to_block, MoveResolver &move_resolver) { | |
| 1679 if (from_block->number_of_sux() <= 1) { | |
| 1680 TRACE_LINEAR_SCAN(4, tty->print_cr("inserting moves at end of from_block B%d", from_block->block_id())); | |
| 1681 | |
| 1682 LIR_OpList* instructions = from_block->lir()->instructions_list(); | |
| 1683 LIR_OpBranch* branch = instructions->last()->as_OpBranch(); | |
| 1684 if (branch != NULL) { | |
| 1685 // insert moves before branch | |
| 1686 assert(branch->cond() == lir_cond_always, "block does not end with an unconditional jump"); | |
| 1687 move_resolver.set_insert_position(from_block->lir(), instructions->length() - 2); | |
| 1688 } else { | |
| 1689 move_resolver.set_insert_position(from_block->lir(), instructions->length() - 1); | |
| 1690 } | |
| 1691 | |
| 1692 } else { | |
| 1693 TRACE_LINEAR_SCAN(4, tty->print_cr("inserting moves at beginning of to_block B%d", to_block->block_id())); | |
| 1694 #ifdef ASSERT | |
| 1695 assert(from_block->lir()->instructions_list()->at(0)->as_OpLabel() != NULL, "block does not start with a label"); | |
| 1696 | |
| 1697 // because the number of predecessor edges matches the number of | |
| 1698 // successor edges, blocks which are reached by switch statements | |
| 1699 // may have be more than one predecessor but it will be guaranteed | |
| 1700 // that all predecessors will be the same. | |
| 1701 for (int i = 0; i < to_block->number_of_preds(); i++) { | |
| 1702 assert(from_block == to_block->pred_at(i), "all critical edges must be broken"); | |
| 1703 } | |
| 1704 #endif | |
| 1705 | |
| 1706 move_resolver.set_insert_position(to_block->lir(), 0); | |
| 1707 } | |
| 1708 } | |
| 1709 | |
| 1710 | |
| 1711 // insert necessary moves (spilling or reloading) at edges between blocks if interval has been split | |
| 1712 void LinearScan::resolve_data_flow() { | |
| 1713 TIME_LINEAR_SCAN(timer_resolve_data_flow); | |
| 1714 | |
| 1715 int num_blocks = block_count(); | |
| 1716 MoveResolver move_resolver(this); | |
| 1717 BitMap block_completed(num_blocks); block_completed.clear(); | |
| 1718 BitMap already_resolved(num_blocks); already_resolved.clear(); | |
| 1719 | |
| 1720 int i; | |
| 1721 for (i = 0; i < num_blocks; i++) { | |
| 1722 BlockBegin* block = block_at(i); | |
| 1723 | |
| 1724 // check if block has only one predecessor and only one successor | |
| 1725 if (block->number_of_preds() == 1 && block->number_of_sux() == 1 && block->number_of_exception_handlers() == 0) { | |
| 1726 LIR_OpList* instructions = block->lir()->instructions_list(); | |
| 1727 assert(instructions->at(0)->code() == lir_label, "block must start with label"); | |
| 1728 assert(instructions->last()->code() == lir_branch, "block with successors must end with branch"); | |
| 1729 assert(instructions->last()->as_OpBranch()->cond() == lir_cond_always, "block with successor must end with unconditional branch"); | |
| 1730 | |
| 1731 // check if block is empty (only label and branch) | |
| 1732 if (instructions->length() == 2) { | |
| 1733 BlockBegin* pred = block->pred_at(0); | |
| 1734 BlockBegin* sux = block->sux_at(0); | |
| 1735 | |
| 1736 // prevent optimization of two consecutive blocks | |
| 1737 if (!block_completed.at(pred->linear_scan_number()) && !block_completed.at(sux->linear_scan_number())) { | |
| 1738 TRACE_LINEAR_SCAN(3, tty->print_cr("**** optimizing empty block B%d (pred: B%d, sux: B%d)", block->block_id(), pred->block_id(), sux->block_id())); | |
| 1739 block_completed.set_bit(block->linear_scan_number()); | |
| 1740 | |
| 1741 // directly resolve between pred and sux (without looking at the empty block between) | |
| 1742 resolve_collect_mappings(pred, sux, move_resolver); | |
| 1743 if (move_resolver.has_mappings()) { | |
| 1744 move_resolver.set_insert_position(block->lir(), 0); | |
| 1745 move_resolver.resolve_and_append_moves(); | |
| 1746 } | |
| 1747 } | |
| 1748 } | |
| 1749 } | |
| 1750 } | |
| 1751 | |
| 1752 | |
| 1753 for (i = 0; i < num_blocks; i++) { | |
| 1754 if (!block_completed.at(i)) { | |
| 1755 BlockBegin* from_block = block_at(i); | |
| 1756 already_resolved.set_from(block_completed); | |
| 1757 | |
| 1758 int num_sux = from_block->number_of_sux(); | |
| 1759 for (int s = 0; s < num_sux; s++) { | |
| 1760 BlockBegin* to_block = from_block->sux_at(s); | |
| 1761 | |
| 1762 // check for duplicate edges between the same blocks (can happen with switch blocks) | |
| 1763 if (!already_resolved.at(to_block->linear_scan_number())) { | |
| 1764 TRACE_LINEAR_SCAN(3, tty->print_cr("**** processing edge between B%d and B%d", from_block->block_id(), to_block->block_id())); | |
| 1765 already_resolved.set_bit(to_block->linear_scan_number()); | |
| 1766 | |
| 1767 // collect all intervals that have been split between from_block and to_block | |
| 1768 resolve_collect_mappings(from_block, to_block, move_resolver); | |
| 1769 if (move_resolver.has_mappings()) { | |
| 1770 resolve_find_insert_pos(from_block, to_block, move_resolver); | |
| 1771 move_resolver.resolve_and_append_moves(); | |
| 1772 } | |
| 1773 } | |
| 1774 } | |
| 1775 } | |
| 1776 } | |
| 1777 } | |
| 1778 | |
| 1779 | |
| 1780 void LinearScan::resolve_exception_entry(BlockBegin* block, int reg_num, MoveResolver &move_resolver) { | |
| 1781 if (interval_at(reg_num) == NULL) { | |
| 1782 // if a phi function is never used, no interval is created -> ignore this | |
| 1783 return; | |
| 1784 } | |
| 1785 | |
| 1786 Interval* interval = interval_at_block_begin(block, reg_num); | |
| 1787 int reg = interval->assigned_reg(); | |
| 1788 int regHi = interval->assigned_regHi(); | |
| 1789 | |
| 1790 if ((reg < nof_regs && interval->always_in_memory()) || | |
| 1791 (use_fpu_stack_allocation() && reg >= pd_first_fpu_reg && reg <= pd_last_fpu_reg)) { | |
| 1792 // the interval is split to get a short range that is located on the stack | |
| 1793 // in the following two cases: | |
| 1794 // * the interval started in memory (e.g. method parameter), but is currently in a register | |
| 1795 // this is an optimization for exception handling that reduces the number of moves that | |
| 1796 // are necessary for resolving the states when an exception uses this exception handler | |
| 1797 // * the interval would be on the fpu stack at the begin of the exception handler | |
| 1798 // this is not allowed because of the complicated fpu stack handling on Intel | |
| 1799 | |
| 1800 // range that will be spilled to memory | |
| 1801 int from_op_id = block->first_lir_instruction_id(); | |
| 1802 int to_op_id = from_op_id + 1; // short live range of length 1 | |
| 1803 assert(interval->from() <= from_op_id && interval->to() >= to_op_id, | |
| 1804 "no split allowed between exception entry and first instruction"); | |
| 1805 | |
| 1806 if (interval->from() != from_op_id) { | |
| 1807 // the part before from_op_id is unchanged | |
| 1808 interval = interval->split(from_op_id); | |
| 1809 interval->assign_reg(reg, regHi); | |
| 1810 append_interval(interval); | |
| 1811 } | |
| 1812 assert(interval->from() == from_op_id, "must be true now"); | |
| 1813 | |
| 1814 Interval* spilled_part = interval; | |
| 1815 if (interval->to() != to_op_id) { | |
| 1816 // the part after to_op_id is unchanged | |
| 1817 spilled_part = interval->split_from_start(to_op_id); | |
| 1818 append_interval(spilled_part); | |
| 1819 move_resolver.add_mapping(spilled_part, interval); | |
| 1820 } | |
| 1821 assign_spill_slot(spilled_part); | |
| 1822 | |
| 1823 assert(spilled_part->from() == from_op_id && spilled_part->to() == to_op_id, "just checking"); | |
| 1824 } | |
| 1825 } | |
| 1826 | |
| 1827 void LinearScan::resolve_exception_entry(BlockBegin* block, MoveResolver &move_resolver) { | |
| 1828 assert(block->is_set(BlockBegin::exception_entry_flag), "should not call otherwise"); | |
| 1829 DEBUG_ONLY(move_resolver.check_empty()); | |
| 1830 | |
| 1831 // visit all registers where the live_in bit is set | |
| 1832 int size = live_set_size(); | |
| 304 | 1833 for (int r = (int)block->live_in().get_next_one_offset(0, size); r < size; r = (int)block->live_in().get_next_one_offset(r + 1, size)) { |
| 0 | 1834 resolve_exception_entry(block, r, move_resolver); |
| 1835 } | |
| 1836 | |
| 1837 // the live_in bits are not set for phi functions of the xhandler entry, so iterate them separately | |
| 1838 for_each_phi_fun(block, phi, | |
| 1839 resolve_exception_entry(block, phi->operand()->vreg_number(), move_resolver) | |
| 1840 ); | |
| 1841 | |
| 1842 if (move_resolver.has_mappings()) { | |
| 1843 // insert moves after first instruction | |
| 1844 move_resolver.set_insert_position(block->lir(), 1); | |
| 1845 move_resolver.resolve_and_append_moves(); | |
| 1846 } | |
| 1847 } | |
| 1848 | |
| 1849 | |
| 1850 void LinearScan::resolve_exception_edge(XHandler* handler, int throwing_op_id, int reg_num, Phi* phi, MoveResolver &move_resolver) { | |
| 1851 if (interval_at(reg_num) == NULL) { | |
| 1852 // if a phi function is never used, no interval is created -> ignore this | |
| 1853 return; | |
| 1854 } | |
| 1855 | |
| 1856 // the computation of to_interval is equal to resolve_collect_mappings, | |
| 1857 // but from_interval is more complicated because of phi functions | |
| 1858 BlockBegin* to_block = handler->entry_block(); | |
| 1859 Interval* to_interval = interval_at_block_begin(to_block, reg_num); | |
| 1860 | |
| 1861 if (phi != NULL) { | |
| 1862 // phi function of the exception entry block | |
| 1863 // no moves are created for this phi function in the LIR_Generator, so the | |
| 1864 // interval at the throwing instruction must be searched using the operands | |
| 1865 // of the phi function | |
| 1866 Value from_value = phi->operand_at(handler->phi_operand()); | |
| 1867 | |
| 1868 // with phi functions it can happen that the same from_value is used in | |
| 1869 // multiple mappings, so notify move-resolver that this is allowed | |
| 1870 move_resolver.set_multiple_reads_allowed(); | |
| 1871 | |
| 1872 Constant* con = from_value->as_Constant(); | |
| 1873 if (con != NULL && !con->is_pinned()) { | |
| 1874 // unpinned constants may have no register, so add mapping from constant to interval | |
| 1875 move_resolver.add_mapping(LIR_OprFact::value_type(con->type()), to_interval); | |
| 1876 } else { | |
| 1877 // search split child at the throwing op_id | |
| 1878 Interval* from_interval = interval_at_op_id(from_value->operand()->vreg_number(), throwing_op_id); | |
| 1879 move_resolver.add_mapping(from_interval, to_interval); | |
| 1880 } | |
| 1881 | |
| 1882 } else { | |
| 1883 // no phi function, so use reg_num also for from_interval | |
| 1884 // search split child at the throwing op_id | |
| 1885 Interval* from_interval = interval_at_op_id(reg_num, throwing_op_id); | |
| 1886 if (from_interval != to_interval) { | |
| 1887 // optimization to reduce number of moves: when to_interval is on stack and | |
| 1888 // the stack slot is known to be always correct, then no move is necessary | |
| 1889 if (!from_interval->always_in_memory() || from_interval->canonical_spill_slot() != to_interval->assigned_reg()) { | |
| 1890 move_resolver.add_mapping(from_interval, to_interval); | |
| 1891 } | |
| 1892 } | |
| 1893 } | |
| 1894 } | |
| 1895 | |
| 1896 void LinearScan::resolve_exception_edge(XHandler* handler, int throwing_op_id, MoveResolver &move_resolver) { | |
| 1897 TRACE_LINEAR_SCAN(4, tty->print_cr("resolving exception handler B%d: throwing_op_id=%d", handler->entry_block()->block_id(), throwing_op_id)); | |
| 1898 | |
| 1899 DEBUG_ONLY(move_resolver.check_empty()); | |
| 1900 assert(handler->lir_op_id() == -1, "already processed this xhandler"); | |
| 1901 DEBUG_ONLY(handler->set_lir_op_id(throwing_op_id)); | |
| 1902 assert(handler->entry_code() == NULL, "code already present"); | |
| 1903 | |
| 1904 // visit all registers where the live_in bit is set | |
| 1905 BlockBegin* block = handler->entry_block(); | |
| 1906 int size = live_set_size(); | |
| 304 | 1907 for (int r = (int)block->live_in().get_next_one_offset(0, size); r < size; r = (int)block->live_in().get_next_one_offset(r + 1, size)) { |
| 0 | 1908 resolve_exception_edge(handler, throwing_op_id, r, NULL, move_resolver); |
| 1909 } | |
| 1910 | |
| 1911 // the live_in bits are not set for phi functions of the xhandler entry, so iterate them separately | |
| 1912 for_each_phi_fun(block, phi, | |
| 1913 resolve_exception_edge(handler, throwing_op_id, phi->operand()->vreg_number(), phi, move_resolver) | |
| 1914 ); | |
| 1915 | |
| 1916 if (move_resolver.has_mappings()) { | |
| 1917 LIR_List* entry_code = new LIR_List(compilation()); | |
| 1918 move_resolver.set_insert_position(entry_code, 0); | |
| 1919 move_resolver.resolve_and_append_moves(); | |
| 1920 | |
| 1921 entry_code->jump(handler->entry_block()); | |
| 1922 handler->set_entry_code(entry_code); | |
| 1923 } | |
| 1924 } | |
| 1925 | |
| 1926 | |
| 1927 void LinearScan::resolve_exception_handlers() { | |
| 1928 MoveResolver move_resolver(this); | |
| 1929 LIR_OpVisitState visitor; | |
| 1930 int num_blocks = block_count(); | |
| 1931 | |
| 1932 int i; | |
| 1933 for (i = 0; i < num_blocks; i++) { | |
| 1934 BlockBegin* block = block_at(i); | |
| 1935 if (block->is_set(BlockBegin::exception_entry_flag)) { | |
| 1936 resolve_exception_entry(block, move_resolver); | |
| 1937 } | |
| 1938 } | |
| 1939 | |
| 1940 for (i = 0; i < num_blocks; i++) { | |
| 1941 BlockBegin* block = block_at(i); | |
| 1942 LIR_List* ops = block->lir(); | |
| 1943 int num_ops = ops->length(); | |
| 1944 | |
| 1945 // iterate all instructions of the block. skip the first because it is always a label | |
| 1946 assert(visitor.no_operands(ops->at(0)), "first operation must always be a label"); | |
| 1947 for (int j = 1; j < num_ops; j++) { | |
| 1948 LIR_Op* op = ops->at(j); | |
| 1949 int op_id = op->id(); | |
| 1950 | |
| 1951 if (op_id != -1 && has_info(op_id)) { | |
| 1952 // visit operation to collect all operands | |
| 1953 visitor.visit(op); | |
| 1954 assert(visitor.info_count() > 0, "should not visit otherwise"); | |
| 1955 | |
| 1956 XHandlers* xhandlers = visitor.all_xhandler(); | |
| 1957 int n = xhandlers->length(); | |
| 1958 for (int k = 0; k < n; k++) { | |
| 1959 resolve_exception_edge(xhandlers->handler_at(k), op_id, move_resolver); | |
| 1960 } | |
| 1961 | |
| 1962 #ifdef ASSERT | |
| 1963 } else { | |
| 1964 visitor.visit(op); | |
| 1965 assert(visitor.all_xhandler()->length() == 0, "missed exception handler"); | |
| 1966 #endif | |
| 1967 } | |
| 1968 } | |
| 1969 } | |
| 1970 } | |
| 1971 | |
| 1972 | |
| 1973 // ********** Phase 7: assign register numbers back to LIR | |
| 1974 // (includes computation of debug information and oop maps) | |
| 1975 | |
| 1976 VMReg LinearScan::vm_reg_for_interval(Interval* interval) { | |
| 1977 VMReg reg = interval->cached_vm_reg(); | |
| 1978 if (!reg->is_valid() ) { | |
| 1979 reg = vm_reg_for_operand(operand_for_interval(interval)); | |
| 1980 interval->set_cached_vm_reg(reg); | |
| 1981 } | |
| 1982 assert(reg == vm_reg_for_operand(operand_for_interval(interval)), "wrong cached value"); | |
| 1983 return reg; | |
| 1984 } | |
| 1985 | |
| 1986 VMReg LinearScan::vm_reg_for_operand(LIR_Opr opr) { | |
| 1987 assert(opr->is_oop(), "currently only implemented for oop operands"); | |
| 1988 return frame_map()->regname(opr); | |
| 1989 } | |
| 1990 | |
| 1991 | |
| 1992 LIR_Opr LinearScan::operand_for_interval(Interval* interval) { | |
| 1993 LIR_Opr opr = interval->cached_opr(); | |
| 1994 if (opr->is_illegal()) { | |
| 1995 opr = calc_operand_for_interval(interval); | |
| 1996 interval->set_cached_opr(opr); | |
| 1997 } | |
| 1998 | |
| 1999 assert(opr == calc_operand_for_interval(interval), "wrong cached value"); | |
| 2000 return opr; | |
| 2001 } | |
| 2002 | |
| 2003 LIR_Opr LinearScan::calc_operand_for_interval(const Interval* interval) { | |
| 2004 int assigned_reg = interval->assigned_reg(); | |
| 2005 BasicType type = interval->type(); | |
| 2006 | |
| 2007 if (assigned_reg >= nof_regs) { | |
| 2008 // stack slot | |
| 2009 assert(interval->assigned_regHi() == any_reg, "must not have hi register"); | |
| 2010 return LIR_OprFact::stack(assigned_reg - nof_regs, type); | |
| 2011 | |
| 2012 } else { | |
| 2013 // register | |
| 2014 switch (type) { | |
| 2015 case T_OBJECT: { | |
| 2016 assert(assigned_reg >= pd_first_cpu_reg && assigned_reg <= pd_last_cpu_reg, "no cpu register"); | |
| 2017 assert(interval->assigned_regHi() == any_reg, "must not have hi register"); | |
| 2018 return LIR_OprFact::single_cpu_oop(assigned_reg); | |
| 2019 } | |
| 2020 | |
|
1816
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2021 case T_ADDRESS: { |
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2022 assert(assigned_reg >= pd_first_cpu_reg && assigned_reg <= pd_last_cpu_reg, "no cpu register"); |
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2023 assert(interval->assigned_regHi() == any_reg, "must not have hi register"); |
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2024 return LIR_OprFact::single_cpu_address(assigned_reg); |
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2025 } |
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2026 |
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2027 #ifdef __SOFTFP__ |
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2028 case T_FLOAT: // fall through |
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2029 #endif // __SOFTFP__ |
| 0 | 2030 case T_INT: { |
| 2031 assert(assigned_reg >= pd_first_cpu_reg && assigned_reg <= pd_last_cpu_reg, "no cpu register"); | |
| 2032 assert(interval->assigned_regHi() == any_reg, "must not have hi register"); | |
| 2033 return LIR_OprFact::single_cpu(assigned_reg); | |
| 2034 } | |
| 2035 | |
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2036 #ifdef __SOFTFP__ |
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2037 case T_DOUBLE: // fall through |
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2038 #endif // __SOFTFP__ |
| 0 | 2039 case T_LONG: { |
| 2040 int assigned_regHi = interval->assigned_regHi(); | |
| 2041 assert(assigned_reg >= pd_first_cpu_reg && assigned_reg <= pd_last_cpu_reg, "no cpu register"); | |
| 2042 assert(num_physical_regs(T_LONG) == 1 || | |
| 2043 (assigned_regHi >= pd_first_cpu_reg && assigned_regHi <= pd_last_cpu_reg), "no cpu register"); | |
| 2044 | |
| 2045 assert(assigned_reg != assigned_regHi, "invalid allocation"); | |
| 2046 assert(num_physical_regs(T_LONG) == 1 || assigned_reg < assigned_regHi, | |
| 2047 "register numbers must be sorted (ensure that e.g. a move from eax,ebx to ebx,eax can not occur)"); | |
| 2048 assert((assigned_regHi != any_reg) ^ (num_physical_regs(T_LONG) == 1), "must be match"); | |
| 2049 if (requires_adjacent_regs(T_LONG)) { | |
| 2050 assert(assigned_reg % 2 == 0 && assigned_reg + 1 == assigned_regHi, "must be sequential and even"); | |
| 2051 } | |
| 2052 | |
| 2053 #ifdef _LP64 | |
| 2054 return LIR_OprFact::double_cpu(assigned_reg, assigned_reg); | |
| 2055 #else | |
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2056 #if defined(SPARC) || defined(PPC) |
| 0 | 2057 return LIR_OprFact::double_cpu(assigned_regHi, assigned_reg); |
| 2058 #else | |
| 2059 return LIR_OprFact::double_cpu(assigned_reg, assigned_regHi); | |
| 304 | 2060 #endif // SPARC |
| 2061 #endif // LP64 | |
| 0 | 2062 } |
| 2063 | |
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2064 #ifndef __SOFTFP__ |
| 0 | 2065 case T_FLOAT: { |
| 304 | 2066 #ifdef X86 |
| 0 | 2067 if (UseSSE >= 1) { |
| 2068 assert(assigned_reg >= pd_first_xmm_reg && assigned_reg <= pd_last_xmm_reg, "no xmm register"); | |
| 2069 assert(interval->assigned_regHi() == any_reg, "must not have hi register"); | |
| 2070 return LIR_OprFact::single_xmm(assigned_reg - pd_first_xmm_reg); | |
| 2071 } | |
| 2072 #endif | |
| 2073 | |
| 2074 assert(assigned_reg >= pd_first_fpu_reg && assigned_reg <= pd_last_fpu_reg, "no fpu register"); | |
| 2075 assert(interval->assigned_regHi() == any_reg, "must not have hi register"); | |
| 2076 return LIR_OprFact::single_fpu(assigned_reg - pd_first_fpu_reg); | |
| 2077 } | |
| 2078 | |
| 2079 case T_DOUBLE: { | |
| 304 | 2080 #ifdef X86 |
| 0 | 2081 if (UseSSE >= 2) { |
| 2082 assert(assigned_reg >= pd_first_xmm_reg && assigned_reg <= pd_last_xmm_reg, "no xmm register"); | |
| 2083 assert(interval->assigned_regHi() == any_reg, "must not have hi register (double xmm values are stored in one register)"); | |
| 2084 return LIR_OprFact::double_xmm(assigned_reg - pd_first_xmm_reg); | |
| 2085 } | |
| 2086 #endif | |
| 2087 | |
| 2088 #ifdef SPARC | |
| 2089 assert(assigned_reg >= pd_first_fpu_reg && assigned_reg <= pd_last_fpu_reg, "no fpu register"); | |
| 2090 assert(interval->assigned_regHi() >= pd_first_fpu_reg && interval->assigned_regHi() <= pd_last_fpu_reg, "no fpu register"); | |
| 2091 assert(assigned_reg % 2 == 0 && assigned_reg + 1 == interval->assigned_regHi(), "must be sequential and even"); | |
| 2092 LIR_Opr result = LIR_OprFact::double_fpu(interval->assigned_regHi() - pd_first_fpu_reg, assigned_reg - pd_first_fpu_reg); | |
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2093 #elif defined(ARM) |
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2094 assert(assigned_reg >= pd_first_fpu_reg && assigned_reg <= pd_last_fpu_reg, "no fpu register"); |
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2095 assert(interval->assigned_regHi() >= pd_first_fpu_reg && interval->assigned_regHi() <= pd_last_fpu_reg, "no fpu register"); |
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2096 assert(assigned_reg % 2 == 0 && assigned_reg + 1 == interval->assigned_regHi(), "must be sequential and even"); |
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2097 LIR_Opr result = LIR_OprFact::double_fpu(assigned_reg - pd_first_fpu_reg, interval->assigned_regHi() - pd_first_fpu_reg); |
| 0 | 2098 #else |
| 2099 assert(assigned_reg >= pd_first_fpu_reg && assigned_reg <= pd_last_fpu_reg, "no fpu register"); | |
| 2100 assert(interval->assigned_regHi() == any_reg, "must not have hi register (double fpu values are stored in one register on Intel)"); | |
| 2101 LIR_Opr result = LIR_OprFact::double_fpu(assigned_reg - pd_first_fpu_reg); | |
| 2102 #endif | |
| 2103 return result; | |
| 2104 } | |
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2105 #endif // __SOFTFP__ |
| 0 | 2106 |
| 2107 default: { | |
| 2108 ShouldNotReachHere(); | |
| 2109 return LIR_OprFact::illegalOpr; | |
| 2110 } | |
| 2111 } | |
| 2112 } | |
| 2113 } | |
| 2114 | |
| 2115 LIR_Opr LinearScan::canonical_spill_opr(Interval* interval) { | |
| 2116 assert(interval->canonical_spill_slot() >= nof_regs, "canonical spill slot not set"); | |
| 2117 return LIR_OprFact::stack(interval->canonical_spill_slot() - nof_regs, interval->type()); | |
| 2118 } | |
| 2119 | |
| 2120 LIR_Opr LinearScan::color_lir_opr(LIR_Opr opr, int op_id, LIR_OpVisitState::OprMode mode) { | |
| 2121 assert(opr->is_virtual(), "should not call this otherwise"); | |
| 2122 | |
| 2123 Interval* interval = interval_at(opr->vreg_number()); | |
| 2124 assert(interval != NULL, "interval must exist"); | |
| 2125 | |
| 2126 if (op_id != -1) { | |
| 2127 #ifdef ASSERT | |
| 2128 BlockBegin* block = block_of_op_with_id(op_id); | |
| 2129 if (block->number_of_sux() <= 1 && op_id == block->last_lir_instruction_id()) { | |
| 2130 // check if spill moves could have been appended at the end of this block, but | |
| 2131 // before the branch instruction. So the split child information for this branch would | |
| 2132 // be incorrect. | |
| 2133 LIR_OpBranch* branch = block->lir()->instructions_list()->last()->as_OpBranch(); | |
| 2134 if (branch != NULL) { | |
| 2135 if (block->live_out().at(opr->vreg_number())) { | |
| 2136 assert(branch->cond() == lir_cond_always, "block does not end with an unconditional jump"); | |
| 2137 assert(false, "can't get split child for the last branch of a block because the information would be incorrect (moves are inserted before the branch in resolve_data_flow)"); | |
| 2138 } | |
| 2139 } | |
| 2140 } | |
| 2141 #endif | |
| 2142 | |
| 2143 // operands are not changed when an interval is split during allocation, | |
| 2144 // so search the right interval here | |
| 2145 interval = split_child_at_op_id(interval, op_id, mode); | |
| 2146 } | |
| 2147 | |
| 2148 LIR_Opr res = operand_for_interval(interval); | |
| 2149 | |
| 304 | 2150 #ifdef X86 |
| 0 | 2151 // new semantic for is_last_use: not only set on definite end of interval, |
| 2152 // but also before hole | |
| 2153 // This may still miss some cases (e.g. for dead values), but it is not necessary that the | |
| 2154 // last use information is completely correct | |
| 2155 // information is only needed for fpu stack allocation | |
| 2156 if (res->is_fpu_register()) { | |
| 2157 if (opr->is_last_use() || op_id == interval->to() || (op_id != -1 && interval->has_hole_between(op_id, op_id + 1))) { | |
| 2158 assert(op_id == -1 || !is_block_begin(op_id), "holes at begin of block may also result from control flow"); | |
| 2159 res = res->make_last_use(); | |
| 2160 } | |
| 2161 } | |
| 2162 #endif | |
| 2163 | |
| 2164 assert(!gen()->is_vreg_flag_set(opr->vreg_number(), LIRGenerator::callee_saved) || !FrameMap::is_caller_save_register(res), "bad allocation"); | |
| 2165 | |
| 2166 return res; | |
| 2167 } | |
| 2168 | |
| 2169 | |
| 2170 #ifdef ASSERT | |
| 2171 // some methods used to check correctness of debug information | |
| 2172 | |
| 2173 void assert_no_register_values(GrowableArray<ScopeValue*>* values) { | |
| 2174 if (values == NULL) { | |
| 2175 return; | |
| 2176 } | |
| 2177 | |
| 2178 for (int i = 0; i < values->length(); i++) { | |
| 2179 ScopeValue* value = values->at(i); | |
| 2180 | |
| 2181 if (value->is_location()) { | |
| 2182 Location location = ((LocationValue*)value)->location(); | |
| 2183 assert(location.where() == Location::on_stack, "value is in register"); | |
| 2184 } | |
| 2185 } | |
| 2186 } | |
| 2187 | |
| 2188 void assert_no_register_values(GrowableArray<MonitorValue*>* values) { | |
| 2189 if (values == NULL) { | |
| 2190 return; | |
| 2191 } | |
| 2192 | |
| 2193 for (int i = 0; i < values->length(); i++) { | |
| 2194 MonitorValue* value = values->at(i); | |
| 2195 | |
| 2196 if (value->owner()->is_location()) { | |
| 2197 Location location = ((LocationValue*)value->owner())->location(); | |
| 2198 assert(location.where() == Location::on_stack, "owner is in register"); | |
| 2199 } | |
| 2200 assert(value->basic_lock().where() == Location::on_stack, "basic_lock is in register"); | |
| 2201 } | |
| 2202 } | |
| 2203 | |
| 2204 void assert_equal(Location l1, Location l2) { | |
| 2205 assert(l1.where() == l2.where() && l1.type() == l2.type() && l1.offset() == l2.offset(), ""); | |
| 2206 } | |
| 2207 | |
| 2208 void assert_equal(ScopeValue* v1, ScopeValue* v2) { | |
| 2209 if (v1->is_location()) { | |
| 2210 assert(v2->is_location(), ""); | |
| 2211 assert_equal(((LocationValue*)v1)->location(), ((LocationValue*)v2)->location()); | |
| 2212 } else if (v1->is_constant_int()) { | |
| 2213 assert(v2->is_constant_int(), ""); | |
| 2214 assert(((ConstantIntValue*)v1)->value() == ((ConstantIntValue*)v2)->value(), ""); | |
| 2215 } else if (v1->is_constant_double()) { | |
| 2216 assert(v2->is_constant_double(), ""); | |
| 2217 assert(((ConstantDoubleValue*)v1)->value() == ((ConstantDoubleValue*)v2)->value(), ""); | |
| 2218 } else if (v1->is_constant_long()) { | |
| 2219 assert(v2->is_constant_long(), ""); | |
| 2220 assert(((ConstantLongValue*)v1)->value() == ((ConstantLongValue*)v2)->value(), ""); | |
| 2221 } else if (v1->is_constant_oop()) { | |
| 2222 assert(v2->is_constant_oop(), ""); | |
| 2223 assert(((ConstantOopWriteValue*)v1)->value() == ((ConstantOopWriteValue*)v2)->value(), ""); | |
| 2224 } else { | |
| 2225 ShouldNotReachHere(); | |
| 2226 } | |
| 2227 } | |
| 2228 | |
| 2229 void assert_equal(MonitorValue* m1, MonitorValue* m2) { | |
| 2230 assert_equal(m1->owner(), m2->owner()); | |
| 2231 assert_equal(m1->basic_lock(), m2->basic_lock()); | |
| 2232 } | |
| 2233 | |
| 2234 void assert_equal(IRScopeDebugInfo* d1, IRScopeDebugInfo* d2) { | |
| 2235 assert(d1->scope() == d2->scope(), "not equal"); | |
| 2236 assert(d1->bci() == d2->bci(), "not equal"); | |
| 2237 | |
| 2238 if (d1->locals() != NULL) { | |
| 2239 assert(d1->locals() != NULL && d2->locals() != NULL, "not equal"); | |
| 2240 assert(d1->locals()->length() == d2->locals()->length(), "not equal"); | |
| 2241 for (int i = 0; i < d1->locals()->length(); i++) { | |
| 2242 assert_equal(d1->locals()->at(i), d2->locals()->at(i)); | |
| 2243 } | |
| 2244 } else { | |
| 2245 assert(d1->locals() == NULL && d2->locals() == NULL, "not equal"); | |
| 2246 } | |
| 2247 | |
| 2248 if (d1->expressions() != NULL) { | |
| 2249 assert(d1->expressions() != NULL && d2->expressions() != NULL, "not equal"); | |
| 2250 assert(d1->expressions()->length() == d2->expressions()->length(), "not equal"); | |
| 2251 for (int i = 0; i < d1->expressions()->length(); i++) { | |
| 2252 assert_equal(d1->expressions()->at(i), d2->expressions()->at(i)); | |
| 2253 } | |
| 2254 } else { | |
| 2255 assert(d1->expressions() == NULL && d2->expressions() == NULL, "not equal"); | |
| 2256 } | |
| 2257 | |
| 2258 if (d1->monitors() != NULL) { | |
| 2259 assert(d1->monitors() != NULL && d2->monitors() != NULL, "not equal"); | |
| 2260 assert(d1->monitors()->length() == d2->monitors()->length(), "not equal"); | |
| 2261 for (int i = 0; i < d1->monitors()->length(); i++) { | |
| 2262 assert_equal(d1->monitors()->at(i), d2->monitors()->at(i)); | |
| 2263 } | |
| 2264 } else { | |
| 2265 assert(d1->monitors() == NULL && d2->monitors() == NULL, "not equal"); | |
| 2266 } | |
| 2267 | |
| 2268 if (d1->caller() != NULL) { | |
| 2269 assert(d1->caller() != NULL && d2->caller() != NULL, "not equal"); | |
| 2270 assert_equal(d1->caller(), d2->caller()); | |
| 2271 } else { | |
| 2272 assert(d1->caller() == NULL && d2->caller() == NULL, "not equal"); | |
| 2273 } | |
| 2274 } | |
| 2275 | |
| 2276 void check_stack_depth(CodeEmitInfo* info, int stack_end) { | |
| 1819 | 2277 if (info->stack()->bci() != SynchronizationEntryBCI && !info->scope()->method()->is_native()) { |
| 2278 Bytecodes::Code code = info->scope()->method()->java_code_at_bci(info->stack()->bci()); | |
| 0 | 2279 switch (code) { |
| 2280 case Bytecodes::_ifnull : // fall through | |
| 2281 case Bytecodes::_ifnonnull : // fall through | |
| 2282 case Bytecodes::_ifeq : // fall through | |
| 2283 case Bytecodes::_ifne : // fall through | |
| 2284 case Bytecodes::_iflt : // fall through | |
| 2285 case Bytecodes::_ifge : // fall through | |
| 2286 case Bytecodes::_ifgt : // fall through | |
| 2287 case Bytecodes::_ifle : // fall through | |
| 2288 case Bytecodes::_if_icmpeq : // fall through | |
| 2289 case Bytecodes::_if_icmpne : // fall through | |
| 2290 case Bytecodes::_if_icmplt : // fall through | |
| 2291 case Bytecodes::_if_icmpge : // fall through | |
| 2292 case Bytecodes::_if_icmpgt : // fall through | |
| 2293 case Bytecodes::_if_icmple : // fall through | |
| 2294 case Bytecodes::_if_acmpeq : // fall through | |
| 2295 case Bytecodes::_if_acmpne : | |
| 2296 assert(stack_end >= -Bytecodes::depth(code), "must have non-empty expression stack at if bytecode"); | |
| 2297 break; | |
| 2298 } | |
| 2299 } | |
| 2300 } | |
| 2301 | |
| 2302 #endif // ASSERT | |
| 2303 | |
| 2304 | |
| 2305 IntervalWalker* LinearScan::init_compute_oop_maps() { | |
| 2306 // setup lists of potential oops for walking | |
| 2307 Interval* oop_intervals; | |
| 2308 Interval* non_oop_intervals; | |
| 2309 | |
| 2310 create_unhandled_lists(&oop_intervals, &non_oop_intervals, is_oop_interval, NULL); | |
| 2311 | |
| 2312 // intervals that have no oops inside need not to be processed | |
| 2313 // to ensure a walking until the last instruction id, add a dummy interval | |
| 2314 // with a high operation id | |
| 2315 non_oop_intervals = new Interval(any_reg); | |
| 2316 non_oop_intervals->add_range(max_jint - 2, max_jint - 1); | |
| 2317 | |
| 2318 return new IntervalWalker(this, oop_intervals, non_oop_intervals); | |
| 2319 } | |
| 2320 | |
| 2321 | |
| 2322 OopMap* LinearScan::compute_oop_map(IntervalWalker* iw, LIR_Op* op, CodeEmitInfo* info, bool is_call_site) { | |
| 2323 TRACE_LINEAR_SCAN(3, tty->print_cr("creating oop map at op_id %d", op->id())); | |
| 2324 | |
| 2325 // walk before the current operation -> intervals that start at | |
| 2326 // the operation (= output operands of the operation) are not | |
| 2327 // included in the oop map | |
| 2328 iw->walk_before(op->id()); | |
| 2329 | |
| 2330 int frame_size = frame_map()->framesize(); | |
| 2331 int arg_count = frame_map()->oop_map_arg_count(); | |
| 2332 OopMap* map = new OopMap(frame_size, arg_count); | |
| 2333 | |
| 2334 // Check if this is a patch site. | |
| 2335 bool is_patch_info = false; | |
| 2336 if (op->code() == lir_move) { | |
| 2337 assert(!is_call_site, "move must not be a call site"); | |
| 2338 assert(op->as_Op1() != NULL, "move must be LIR_Op1"); | |
| 2339 LIR_Op1* move = (LIR_Op1*)op; | |
| 2340 | |
| 2341 is_patch_info = move->patch_code() != lir_patch_none; | |
| 2342 } | |
| 2343 | |
| 2344 // Iterate through active intervals | |
| 2345 for (Interval* interval = iw->active_first(fixedKind); interval != Interval::end(); interval = interval->next()) { | |
| 2346 int assigned_reg = interval->assigned_reg(); | |
| 2347 | |
| 2348 assert(interval->current_from() <= op->id() && op->id() <= interval->current_to(), "interval should not be active otherwise"); | |
| 2349 assert(interval->assigned_regHi() == any_reg, "oop must be single word"); | |
| 2350 assert(interval->reg_num() >= LIR_OprDesc::vreg_base, "fixed interval found"); | |
| 2351 | |
| 2352 // Check if this range covers the instruction. Intervals that | |
| 2353 // start or end at the current operation are not included in the | |
| 2354 // oop map, except in the case of patching moves. For patching | |
| 2355 // moves, any intervals which end at this instruction are included | |
| 2356 // in the oop map since we may safepoint while doing the patch | |
| 2357 // before we've consumed the inputs. | |
| 2358 if (is_patch_info || op->id() < interval->current_to()) { | |
| 2359 | |
| 2360 // caller-save registers must not be included into oop-maps at calls | |
| 2361 assert(!is_call_site || assigned_reg >= nof_regs || !is_caller_save(assigned_reg), "interval is in a caller-save register at a call -> register will be overwritten"); | |
| 2362 | |
| 2363 VMReg name = vm_reg_for_interval(interval); | |
| 2364 map->set_oop(name); | |
| 2365 | |
| 2366 // Spill optimization: when the stack value is guaranteed to be always correct, | |
| 2367 // then it must be added to the oop map even if the interval is currently in a register | |
| 2368 if (interval->always_in_memory() && | |
| 2369 op->id() > interval->spill_definition_pos() && | |
| 2370 interval->assigned_reg() != interval->canonical_spill_slot()) { | |
| 2371 assert(interval->spill_definition_pos() > 0, "position not set correctly"); | |
| 2372 assert(interval->canonical_spill_slot() >= LinearScan::nof_regs, "no spill slot assigned"); | |
| 2373 assert(interval->assigned_reg() < LinearScan::nof_regs, "interval is on stack, so stack slot is registered twice"); | |
| 2374 | |
| 2375 map->set_oop(frame_map()->slot_regname(interval->canonical_spill_slot() - LinearScan::nof_regs)); | |
| 2376 } | |
| 2377 } | |
| 2378 } | |
| 2379 | |
| 2380 // add oops from lock stack | |
| 2381 assert(info->stack() != NULL, "CodeEmitInfo must always have a stack"); | |
| 1819 | 2382 int locks_count = info->stack()->total_locks_size(); |
| 0 | 2383 for (int i = 0; i < locks_count; i++) { |
| 2384 map->set_oop(frame_map()->monitor_object_regname(i)); | |
| 2385 } | |
| 2386 | |
| 2387 return map; | |
| 2388 } | |
| 2389 | |
| 2390 | |
| 2391 void LinearScan::compute_oop_map(IntervalWalker* iw, const LIR_OpVisitState &visitor, LIR_Op* op) { | |
| 2392 assert(visitor.info_count() > 0, "no oop map needed"); | |
| 2393 | |
| 2394 // compute oop_map only for first CodeEmitInfo | |
| 2395 // because it is (in most cases) equal for all other infos of the same operation | |
| 2396 CodeEmitInfo* first_info = visitor.info_at(0); | |
| 2397 OopMap* first_oop_map = compute_oop_map(iw, op, first_info, visitor.has_call()); | |
| 2398 | |
| 2399 for (int i = 0; i < visitor.info_count(); i++) { | |
| 2400 CodeEmitInfo* info = visitor.info_at(i); | |
| 2401 OopMap* oop_map = first_oop_map; | |
| 2402 | |
| 2403 if (info->stack()->locks_size() != first_info->stack()->locks_size()) { | |
| 2404 // this info has a different number of locks then the precomputed oop map | |
| 2405 // (possible for lock and unlock instructions) -> compute oop map with | |
| 2406 // correct lock information | |
| 2407 oop_map = compute_oop_map(iw, op, info, visitor.has_call()); | |
| 2408 } | |
| 2409 | |
| 2410 if (info->_oop_map == NULL) { | |
| 2411 info->_oop_map = oop_map; | |
| 2412 } else { | |
| 2413 // a CodeEmitInfo can not be shared between different LIR-instructions | |
| 2414 // because interval splitting can occur anywhere between two instructions | |
| 2415 // and so the oop maps must be different | |
| 2416 // -> check if the already set oop_map is exactly the one calculated for this operation | |
| 2417 assert(info->_oop_map == oop_map, "same CodeEmitInfo used for multiple LIR instructions"); | |
| 2418 } | |
| 2419 } | |
| 2420 } | |
| 2421 | |
| 2422 | |
| 2423 // frequently used constants | |
| 2424 ConstantOopWriteValue LinearScan::_oop_null_scope_value = ConstantOopWriteValue(NULL); | |
| 2425 ConstantIntValue LinearScan::_int_m1_scope_value = ConstantIntValue(-1); | |
| 2426 ConstantIntValue LinearScan::_int_0_scope_value = ConstantIntValue(0); | |
| 2427 ConstantIntValue LinearScan::_int_1_scope_value = ConstantIntValue(1); | |
| 2428 ConstantIntValue LinearScan::_int_2_scope_value = ConstantIntValue(2); | |
| 2429 LocationValue _illegal_value = LocationValue(Location()); | |
| 2430 | |
| 2431 void LinearScan::init_compute_debug_info() { | |
| 2432 // cache for frequently used scope values | |
| 2433 // (cpu registers and stack slots) | |
| 2434 _scope_value_cache = ScopeValueArray((LinearScan::nof_cpu_regs + frame_map()->argcount() + max_spills()) * 2, NULL); | |
| 2435 } | |
| 2436 | |
| 2437 MonitorValue* LinearScan::location_for_monitor_index(int monitor_index) { | |
| 2438 Location loc; | |
| 2439 if (!frame_map()->location_for_monitor_object(monitor_index, &loc)) { | |
| 2440 bailout("too large frame"); | |
| 2441 } | |
| 2442 ScopeValue* object_scope_value = new LocationValue(loc); | |
| 2443 | |
| 2444 if (!frame_map()->location_for_monitor_lock(monitor_index, &loc)) { | |
| 2445 bailout("too large frame"); | |
| 2446 } | |
| 2447 return new MonitorValue(object_scope_value, loc); | |
| 2448 } | |
| 2449 | |
| 2450 LocationValue* LinearScan::location_for_name(int name, Location::Type loc_type) { | |
| 2451 Location loc; | |
| 2452 if (!frame_map()->locations_for_slot(name, loc_type, &loc)) { | |
| 2453 bailout("too large frame"); | |
| 2454 } | |
| 2455 return new LocationValue(loc); | |
| 2456 } | |
| 2457 | |
| 2458 | |
| 2459 int LinearScan::append_scope_value_for_constant(LIR_Opr opr, GrowableArray<ScopeValue*>* scope_values) { | |
| 2460 assert(opr->is_constant(), "should not be called otherwise"); | |
| 2461 | |
| 2462 LIR_Const* c = opr->as_constant_ptr(); | |
| 2463 BasicType t = c->type(); | |
| 2464 switch (t) { | |
| 2465 case T_OBJECT: { | |
| 2466 jobject value = c->as_jobject(); | |
| 2467 if (value == NULL) { | |
| 2468 scope_values->append(&_oop_null_scope_value); | |
| 2469 } else { | |
| 2470 scope_values->append(new ConstantOopWriteValue(c->as_jobject())); | |
| 2471 } | |
| 2472 return 1; | |
| 2473 } | |
| 2474 | |
| 2475 case T_INT: // fall through | |
| 2476 case T_FLOAT: { | |
| 2477 int value = c->as_jint_bits(); | |
| 2478 switch (value) { | |
| 2479 case -1: scope_values->append(&_int_m1_scope_value); break; | |
| 2480 case 0: scope_values->append(&_int_0_scope_value); break; | |
| 2481 case 1: scope_values->append(&_int_1_scope_value); break; | |
| 2482 case 2: scope_values->append(&_int_2_scope_value); break; | |
| 2483 default: scope_values->append(new ConstantIntValue(c->as_jint_bits())); break; | |
| 2484 } | |
| 2485 return 1; | |
| 2486 } | |
| 2487 | |
| 2488 case T_LONG: // fall through | |
| 2489 case T_DOUBLE: { | |
| 1060 | 2490 #ifdef _LP64 |
| 2491 scope_values->append(&_int_0_scope_value); | |
| 2492 scope_values->append(new ConstantLongValue(c->as_jlong_bits())); | |
| 2493 #else | |
| 0 | 2494 if (hi_word_offset_in_bytes > lo_word_offset_in_bytes) { |
| 2495 scope_values->append(new ConstantIntValue(c->as_jint_hi_bits())); | |
| 2496 scope_values->append(new ConstantIntValue(c->as_jint_lo_bits())); | |
| 2497 } else { | |
| 2498 scope_values->append(new ConstantIntValue(c->as_jint_lo_bits())); | |
| 2499 scope_values->append(new ConstantIntValue(c->as_jint_hi_bits())); | |
| 2500 } | |
| 1060 | 2501 #endif |
| 0 | 2502 return 2; |
| 2503 } | |
| 2504 | |
|
1297
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diff
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|
2505 case T_ADDRESS: { |
|
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diff
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|
2506 #ifdef _LP64 |
|
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diff
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|
2507 scope_values->append(new ConstantLongValue(c->as_jint())); |
|
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diff
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|
2508 #else |
|
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diff
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|
2509 scope_values->append(new ConstantIntValue(c->as_jint())); |
|
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diff
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|
2510 #endif |
|
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|
2511 return 1; |
|
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|
2512 } |
|
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|
2513 |
| 0 | 2514 default: |
| 2515 ShouldNotReachHere(); | |
| 304 | 2516 return -1; |
| 0 | 2517 } |
| 2518 } | |
| 2519 | |
| 2520 int LinearScan::append_scope_value_for_operand(LIR_Opr opr, GrowableArray<ScopeValue*>* scope_values) { | |
| 2521 if (opr->is_single_stack()) { | |
| 2522 int stack_idx = opr->single_stack_ix(); | |
| 2523 bool is_oop = opr->is_oop_register(); | |
| 2524 int cache_idx = (stack_idx + LinearScan::nof_cpu_regs) * 2 + (is_oop ? 1 : 0); | |
| 2525 | |
| 2526 ScopeValue* sv = _scope_value_cache.at(cache_idx); | |
| 2527 if (sv == NULL) { | |
| 2528 Location::Type loc_type = is_oop ? Location::oop : Location::normal; | |
| 2529 sv = location_for_name(stack_idx, loc_type); | |
| 2530 _scope_value_cache.at_put(cache_idx, sv); | |
| 2531 } | |
| 2532 | |
| 2533 // check if cached value is correct | |
| 2534 DEBUG_ONLY(assert_equal(sv, location_for_name(stack_idx, is_oop ? Location::oop : Location::normal))); | |
| 2535 | |
| 2536 scope_values->append(sv); | |
| 2537 return 1; | |
| 2538 | |
| 2539 } else if (opr->is_single_cpu()) { | |
| 2540 bool is_oop = opr->is_oop_register(); | |
| 2541 int cache_idx = opr->cpu_regnr() * 2 + (is_oop ? 1 : 0); | |
| 1060 | 2542 Location::Type int_loc_type = NOT_LP64(Location::normal) LP64_ONLY(Location::int_in_long); |
| 0 | 2543 |
| 2544 ScopeValue* sv = _scope_value_cache.at(cache_idx); | |
| 2545 if (sv == NULL) { | |
| 1060 | 2546 Location::Type loc_type = is_oop ? Location::oop : int_loc_type; |
| 0 | 2547 VMReg rname = frame_map()->regname(opr); |
| 2548 sv = new LocationValue(Location::new_reg_loc(loc_type, rname)); | |
| 2549 _scope_value_cache.at_put(cache_idx, sv); | |
| 2550 } | |
| 2551 | |
| 2552 // check if cached value is correct | |
| 1060 | 2553 DEBUG_ONLY(assert_equal(sv, new LocationValue(Location::new_reg_loc(is_oop ? Location::oop : int_loc_type, frame_map()->regname(opr))))); |
| 0 | 2554 |
| 2555 scope_values->append(sv); | |
| 2556 return 1; | |
| 2557 | |
| 304 | 2558 #ifdef X86 |
| 0 | 2559 } else if (opr->is_single_xmm()) { |
| 2560 VMReg rname = opr->as_xmm_float_reg()->as_VMReg(); | |
| 2561 LocationValue* sv = new LocationValue(Location::new_reg_loc(Location::normal, rname)); | |
| 2562 | |
| 2563 scope_values->append(sv); | |
| 2564 return 1; | |
| 2565 #endif | |
| 2566 | |
| 2567 } else if (opr->is_single_fpu()) { | |
| 304 | 2568 #ifdef X86 |
| 0 | 2569 // the exact location of fpu stack values is only known |
| 2570 // during fpu stack allocation, so the stack allocator object | |
| 2571 // must be present | |
| 2572 assert(use_fpu_stack_allocation(), "should not have float stack values without fpu stack allocation (all floats must be SSE2)"); | |
| 2573 assert(_fpu_stack_allocator != NULL, "must be present"); | |
| 2574 opr = _fpu_stack_allocator->to_fpu_stack(opr); | |
| 2575 #endif | |
| 2576 | |
| 2577 Location::Type loc_type = float_saved_as_double ? Location::float_in_dbl : Location::normal; | |
| 2578 VMReg rname = frame_map()->fpu_regname(opr->fpu_regnr()); | |
| 2579 LocationValue* sv = new LocationValue(Location::new_reg_loc(loc_type, rname)); | |
| 2580 | |
| 2581 scope_values->append(sv); | |
| 2582 return 1; | |
| 2583 | |
| 2584 } else { | |
| 2585 // double-size operands | |
| 2586 | |
| 2587 ScopeValue* first; | |
| 2588 ScopeValue* second; | |
| 2589 | |
| 2590 if (opr->is_double_stack()) { | |
| 304 | 2591 #ifdef _LP64 |
| 2592 Location loc1; | |
| 2593 Location::Type loc_type = opr->type() == T_LONG ? Location::lng : Location::dbl; | |
| 2594 if (!frame_map()->locations_for_slot(opr->double_stack_ix(), loc_type, &loc1, NULL)) { | |
| 2595 bailout("too large frame"); | |
| 2596 } | |
| 2597 // Does this reverse on x86 vs. sparc? | |
| 2598 first = new LocationValue(loc1); | |
| 2599 second = &_int_0_scope_value; | |
| 2600 #else | |
| 0 | 2601 Location loc1, loc2; |
| 2602 if (!frame_map()->locations_for_slot(opr->double_stack_ix(), Location::normal, &loc1, &loc2)) { | |
| 2603 bailout("too large frame"); | |
| 2604 } | |
| 2605 first = new LocationValue(loc1); | |
| 2606 second = new LocationValue(loc2); | |
| 304 | 2607 #endif // _LP64 |
| 0 | 2608 |
| 2609 } else if (opr->is_double_cpu()) { | |
| 2610 #ifdef _LP64 | |
| 2611 VMReg rname_first = opr->as_register_lo()->as_VMReg(); | |
| 2612 first = new LocationValue(Location::new_reg_loc(Location::lng, rname_first)); | |
| 2613 second = &_int_0_scope_value; | |
| 2614 #else | |
| 2615 VMReg rname_first = opr->as_register_lo()->as_VMReg(); | |
| 2616 VMReg rname_second = opr->as_register_hi()->as_VMReg(); | |
| 2617 | |
| 2618 if (hi_word_offset_in_bytes < lo_word_offset_in_bytes) { | |
| 2619 // lo/hi and swapped relative to first and second, so swap them | |
| 2620 VMReg tmp = rname_first; | |
| 2621 rname_first = rname_second; | |
| 2622 rname_second = tmp; | |
| 2623 } | |
| 2624 | |
| 2625 first = new LocationValue(Location::new_reg_loc(Location::normal, rname_first)); | |
| 2626 second = new LocationValue(Location::new_reg_loc(Location::normal, rname_second)); | |
| 304 | 2627 #endif //_LP64 |
| 2628 | |
| 2629 | |
| 2630 #ifdef X86 | |
| 0 | 2631 } else if (opr->is_double_xmm()) { |
| 2632 assert(opr->fpu_regnrLo() == opr->fpu_regnrHi(), "assumed in calculation"); | |
| 2633 VMReg rname_first = opr->as_xmm_double_reg()->as_VMReg(); | |
| 1369 | 2634 # ifdef _LP64 |
| 2635 first = new LocationValue(Location::new_reg_loc(Location::dbl, rname_first)); | |
| 2636 second = &_int_0_scope_value; | |
| 2637 # else | |
| 0 | 2638 first = new LocationValue(Location::new_reg_loc(Location::normal, rname_first)); |
| 2639 // %%% This is probably a waste but we'll keep things as they were for now | |
| 2640 if (true) { | |
| 2641 VMReg rname_second = rname_first->next(); | |
| 2642 second = new LocationValue(Location::new_reg_loc(Location::normal, rname_second)); | |
| 2643 } | |
| 1369 | 2644 # endif |
| 0 | 2645 #endif |
| 2646 | |
| 2647 } else if (opr->is_double_fpu()) { | |
| 2648 // On SPARC, fpu_regnrLo/fpu_regnrHi represents the two halves of | |
| 304 | 2649 // the double as float registers in the native ordering. On X86, |
| 0 | 2650 // fpu_regnrLo is a FPU stack slot whose VMReg represents |
| 2651 // the low-order word of the double and fpu_regnrLo + 1 is the | |
| 2652 // name for the other half. *first and *second must represent the | |
| 2653 // least and most significant words, respectively. | |
| 2654 | |
| 304 | 2655 #ifdef X86 |
| 0 | 2656 // the exact location of fpu stack values is only known |
| 2657 // during fpu stack allocation, so the stack allocator object | |
| 2658 // must be present | |
| 2659 assert(use_fpu_stack_allocation(), "should not have float stack values without fpu stack allocation (all floats must be SSE2)"); | |
| 2660 assert(_fpu_stack_allocator != NULL, "must be present"); | |
| 2661 opr = _fpu_stack_allocator->to_fpu_stack(opr); | |
| 2662 | |
| 2663 assert(opr->fpu_regnrLo() == opr->fpu_regnrHi(), "assumed in calculation (only fpu_regnrHi is used)"); | |
| 2664 #endif | |
| 2665 #ifdef SPARC | |
| 2666 assert(opr->fpu_regnrLo() == opr->fpu_regnrHi() + 1, "assumed in calculation (only fpu_regnrHi is used)"); | |
| 2667 #endif | |
|
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2668 #ifdef ARM |
|
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2669 assert(opr->fpu_regnrHi() == opr->fpu_regnrLo() + 1, "assumed in calculation (only fpu_regnrLo is used)"); |
|
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2670 #endif |
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2671 #ifdef PPC |
|
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2672 assert(opr->fpu_regnrLo() == opr->fpu_regnrHi(), "assumed in calculation (only fpu_regnrHi is used)"); |
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2673 #endif |
| 0 | 2674 |
| 2675 VMReg rname_first = frame_map()->fpu_regname(opr->fpu_regnrHi()); | |
| 1369 | 2676 #ifdef _LP64 |
| 2677 first = new LocationValue(Location::new_reg_loc(Location::dbl, rname_first)); | |
| 2678 second = &_int_0_scope_value; | |
| 2679 #else | |
| 0 | 2680 first = new LocationValue(Location::new_reg_loc(Location::normal, rname_first)); |
| 2681 // %%% This is probably a waste but we'll keep things as they were for now | |
| 2682 if (true) { | |
| 2683 VMReg rname_second = rname_first->next(); | |
| 2684 second = new LocationValue(Location::new_reg_loc(Location::normal, rname_second)); | |
| 2685 } | |
| 1369 | 2686 #endif |
| 0 | 2687 |
| 2688 } else { | |
| 2689 ShouldNotReachHere(); | |
| 2690 first = NULL; | |
| 2691 second = NULL; | |
| 2692 } | |
| 2693 | |
| 2694 assert(first != NULL && second != NULL, "must be set"); | |
| 2695 // The convention the interpreter uses is that the second local | |
| 2696 // holds the first raw word of the native double representation. | |
| 2697 // This is actually reasonable, since locals and stack arrays | |
| 2698 // grow downwards in all implementations. | |
| 2699 // (If, on some machine, the interpreter's Java locals or stack | |
| 2700 // were to grow upwards, the embedded doubles would be word-swapped.) | |
| 2701 scope_values->append(second); | |
| 2702 scope_values->append(first); | |
| 2703 return 2; | |
| 2704 } | |
| 2705 } | |
| 2706 | |
| 2707 | |
| 2708 int LinearScan::append_scope_value(int op_id, Value value, GrowableArray<ScopeValue*>* scope_values) { | |
| 2709 if (value != NULL) { | |
| 2710 LIR_Opr opr = value->operand(); | |
| 2711 Constant* con = value->as_Constant(); | |
| 2712 | |
| 2713 assert(con == NULL || opr->is_virtual() || opr->is_constant() || opr->is_illegal(), "asumption: Constant instructions have only constant operands (or illegal if constant is optimized away)"); | |
| 2714 assert(con != NULL || opr->is_virtual(), "asumption: non-Constant instructions have only virtual operands"); | |
| 2715 | |
| 2716 if (con != NULL && !con->is_pinned() && !opr->is_constant()) { | |
| 2717 // Unpinned constants may have a virtual operand for a part of the lifetime | |
| 2718 // or may be illegal when it was optimized away, | |
| 2719 // so always use a constant operand | |
| 2720 opr = LIR_OprFact::value_type(con->type()); | |
| 2721 } | |
| 2722 assert(opr->is_virtual() || opr->is_constant(), "other cases not allowed here"); | |
| 2723 | |
| 2724 if (opr->is_virtual()) { | |
| 2725 LIR_OpVisitState::OprMode mode = LIR_OpVisitState::inputMode; | |
| 2726 | |
| 2727 BlockBegin* block = block_of_op_with_id(op_id); | |
| 2728 if (block->number_of_sux() == 1 && op_id == block->last_lir_instruction_id()) { | |
| 2729 // generating debug information for the last instruction of a block. | |
| 2730 // if this instruction is a branch, spill moves are inserted before this branch | |
| 2731 // and so the wrong operand would be returned (spill moves at block boundaries are not | |
| 2732 // considered in the live ranges of intervals) | |
| 2733 // Solution: use the first op_id of the branch target block instead. | |
| 2734 if (block->lir()->instructions_list()->last()->as_OpBranch() != NULL) { | |
| 2735 if (block->live_out().at(opr->vreg_number())) { | |
| 2736 op_id = block->sux_at(0)->first_lir_instruction_id(); | |
| 2737 mode = LIR_OpVisitState::outputMode; | |
| 2738 } | |
| 2739 } | |
| 2740 } | |
| 2741 | |
| 2742 // Get current location of operand | |
| 2743 // The operand must be live because debug information is considered when building the intervals | |
| 2744 // if the interval is not live, color_lir_opr will cause an assertion failure | |
| 2745 opr = color_lir_opr(opr, op_id, mode); | |
| 2746 assert(!has_call(op_id) || opr->is_stack() || !is_caller_save(reg_num(opr)), "can not have caller-save register operands at calls"); | |
| 2747 | |
| 2748 // Append to ScopeValue array | |
| 2749 return append_scope_value_for_operand(opr, scope_values); | |
| 2750 | |
| 2751 } else { | |
| 2752 assert(value->as_Constant() != NULL, "all other instructions have only virtual operands"); | |
| 2753 assert(opr->is_constant(), "operand must be constant"); | |
| 2754 | |
| 2755 return append_scope_value_for_constant(opr, scope_values); | |
| 2756 } | |
| 2757 } else { | |
| 2758 // append a dummy value because real value not needed | |
| 2759 scope_values->append(&_illegal_value); | |
| 2760 return 1; | |
| 2761 } | |
| 2762 } | |
| 2763 | |
| 2764 | |
| 1819 | 2765 IRScopeDebugInfo* LinearScan::compute_debug_info_for_scope(int op_id, IRScope* cur_scope, ValueStack* cur_state, ValueStack* innermost_state) { |
| 0 | 2766 IRScopeDebugInfo* caller_debug_info = NULL; |
| 1819 | 2767 |
| 2768 ValueStack* caller_state = cur_state->caller_state(); | |
| 0 | 2769 if (caller_state != NULL) { |
| 2770 // process recursively to compute outermost scope first | |
| 1819 | 2771 caller_debug_info = compute_debug_info_for_scope(op_id, cur_scope->caller(), caller_state, innermost_state); |
| 0 | 2772 } |
| 2773 | |
| 2774 // initialize these to null. | |
| 2775 // If we don't need deopt info or there are no locals, expressions or monitors, | |
| 2776 // then these get recorded as no information and avoids the allocation of 0 length arrays. | |
| 2777 GrowableArray<ScopeValue*>* locals = NULL; | |
| 2778 GrowableArray<ScopeValue*>* expressions = NULL; | |
| 2779 GrowableArray<MonitorValue*>* monitors = NULL; | |
| 2780 | |
| 2781 // describe local variable values | |
| 1819 | 2782 int nof_locals = cur_state->locals_size(); |
| 0 | 2783 if (nof_locals > 0) { |
| 2784 locals = new GrowableArray<ScopeValue*>(nof_locals); | |
| 2785 | |
| 2786 int pos = 0; | |
| 2787 while (pos < nof_locals) { | |
| 2788 assert(pos < cur_state->locals_size(), "why not?"); | |
| 2789 | |
| 2790 Value local = cur_state->local_at(pos); | |
| 2791 pos += append_scope_value(op_id, local, locals); | |
| 2792 | |
| 2793 assert(locals->length() == pos, "must match"); | |
| 2794 } | |
| 2795 assert(locals->length() == cur_scope->method()->max_locals(), "wrong number of locals"); | |
| 2796 assert(locals->length() == cur_state->locals_size(), "wrong number of locals"); | |
| 1819 | 2797 } else if (cur_scope->method()->max_locals() > 0) { |
| 2798 assert(cur_state->kind() == ValueStack::EmptyExceptionState, "should be"); | |
| 2799 nof_locals = cur_scope->method()->max_locals(); | |
| 2800 locals = new GrowableArray<ScopeValue*>(nof_locals); | |
| 2801 for(int i = 0; i < nof_locals; i++) { | |
| 2802 locals->append(&_illegal_value); | |
| 2803 } | |
| 2804 } | |
| 0 | 2805 |
| 2806 // describe expression stack | |
| 1819 | 2807 int nof_stack = cur_state->stack_size(); |
| 0 | 2808 if (nof_stack > 0) { |
| 2809 expressions = new GrowableArray<ScopeValue*>(nof_stack); | |
| 2810 | |
| 1819 | 2811 int pos = 0; |
| 2812 while (pos < nof_stack) { | |
| 2813 Value expression = cur_state->stack_at_inc(pos); | |
| 0 | 2814 append_scope_value(op_id, expression, expressions); |
| 2815 | |
| 1819 | 2816 assert(expressions->length() == pos, "must match"); |
| 2817 } | |
| 2818 assert(expressions->length() == cur_state->stack_size(), "wrong number of stack entries"); | |
| 0 | 2819 } |
| 2820 | |
| 2821 // describe monitors | |
| 1819 | 2822 int nof_locks = cur_state->locks_size(); |
| 0 | 2823 if (nof_locks > 0) { |
| 1819 | 2824 int lock_offset = cur_state->caller_state() != NULL ? cur_state->caller_state()->total_locks_size() : 0; |
| 0 | 2825 monitors = new GrowableArray<MonitorValue*>(nof_locks); |
| 1819 | 2826 for (int i = 0; i < nof_locks; i++) { |
| 2827 monitors->append(location_for_monitor_index(lock_offset + i)); | |
| 2828 } | |
| 2829 } | |
| 2830 | |
| 2831 return new IRScopeDebugInfo(cur_scope, cur_state->bci(), locals, expressions, monitors, caller_debug_info); | |
| 0 | 2832 } |
| 2833 | |
| 2834 | |
| 2835 void LinearScan::compute_debug_info(CodeEmitInfo* info, int op_id) { | |
| 2836 TRACE_LINEAR_SCAN(3, tty->print_cr("creating debug information at op_id %d", op_id)); | |
| 2837 | |
| 2838 IRScope* innermost_scope = info->scope(); | |
| 2839 ValueStack* innermost_state = info->stack(); | |
| 2840 | |
| 2841 assert(innermost_scope != NULL && innermost_state != NULL, "why is it missing?"); | |
| 2842 | |
| 1819 | 2843 DEBUG_ONLY(check_stack_depth(info, innermost_state->stack_size())); |
| 0 | 2844 |
| 2845 if (info->_scope_debug_info == NULL) { | |
| 2846 // compute debug information | |
| 1819 | 2847 info->_scope_debug_info = compute_debug_info_for_scope(op_id, innermost_scope, innermost_state, innermost_state); |
| 0 | 2848 } else { |
| 2849 // debug information already set. Check that it is correct from the current point of view | |
| 1819 | 2850 DEBUG_ONLY(assert_equal(info->_scope_debug_info, compute_debug_info_for_scope(op_id, innermost_scope, innermost_state, innermost_state))); |
| 0 | 2851 } |
| 2852 } | |
| 2853 | |
| 2854 | |
| 2855 void LinearScan::assign_reg_num(LIR_OpList* instructions, IntervalWalker* iw) { | |
| 2856 LIR_OpVisitState visitor; | |
| 2857 int num_inst = instructions->length(); | |
| 2858 bool has_dead = false; | |
| 2859 | |
| 2860 for (int j = 0; j < num_inst; j++) { | |
| 2861 LIR_Op* op = instructions->at(j); | |
| 2862 if (op == NULL) { // this can happen when spill-moves are removed in eliminate_spill_moves | |
| 2863 has_dead = true; | |
| 2864 continue; | |
| 2865 } | |
| 2866 int op_id = op->id(); | |
| 2867 | |
| 2868 // visit instruction to get list of operands | |
| 2869 visitor.visit(op); | |
| 2870 | |
| 2871 // iterate all modes of the visitor and process all virtual operands | |
| 2872 for_each_visitor_mode(mode) { | |
| 2873 int n = visitor.opr_count(mode); | |
| 2874 for (int k = 0; k < n; k++) { | |
| 2875 LIR_Opr opr = visitor.opr_at(mode, k); | |
| 2876 if (opr->is_virtual_register()) { | |
| 2877 visitor.set_opr_at(mode, k, color_lir_opr(opr, op_id, mode)); | |
| 2878 } | |
| 2879 } | |
| 2880 } | |
| 2881 | |
| 2882 if (visitor.info_count() > 0) { | |
| 2883 // exception handling | |
| 2884 if (compilation()->has_exception_handlers()) { | |
| 2885 XHandlers* xhandlers = visitor.all_xhandler(); | |
| 2886 int n = xhandlers->length(); | |
| 2887 for (int k = 0; k < n; k++) { | |
| 2888 XHandler* handler = xhandlers->handler_at(k); | |
| 2889 if (handler->entry_code() != NULL) { | |
| 2890 assign_reg_num(handler->entry_code()->instructions_list(), NULL); | |
| 2891 } | |
| 2892 } | |
| 2893 } else { | |
| 2894 assert(visitor.all_xhandler()->length() == 0, "missed exception handler"); | |
| 2895 } | |
| 2896 | |
| 2897 // compute oop map | |
| 2898 assert(iw != NULL, "needed for compute_oop_map"); | |
| 2899 compute_oop_map(iw, visitor, op); | |
| 2900 | |
| 2901 // compute debug information | |
| 2902 if (!use_fpu_stack_allocation()) { | |
| 2903 // compute debug information if fpu stack allocation is not needed. | |
| 2904 // when fpu stack allocation is needed, the debug information can not | |
| 2905 // be computed here because the exact location of fpu operands is not known | |
| 2906 // -> debug information is created inside the fpu stack allocator | |
| 2907 int n = visitor.info_count(); | |
| 2908 for (int k = 0; k < n; k++) { | |
| 2909 compute_debug_info(visitor.info_at(k), op_id); | |
| 2910 } | |
| 2911 } | |
| 2912 } | |
| 2913 | |
| 2914 #ifdef ASSERT | |
| 2915 // make sure we haven't made the op invalid. | |
| 2916 op->verify(); | |
| 2917 #endif | |
| 2918 | |
| 2919 // remove useless moves | |
| 2920 if (op->code() == lir_move) { | |
| 2921 assert(op->as_Op1() != NULL, "move must be LIR_Op1"); | |
| 2922 LIR_Op1* move = (LIR_Op1*)op; | |
| 2923 LIR_Opr src = move->in_opr(); | |
| 2924 LIR_Opr dst = move->result_opr(); | |
| 2925 if (dst == src || | |
| 2926 !dst->is_pointer() && !src->is_pointer() && | |
| 2927 src->is_same_register(dst)) { | |
| 2928 instructions->at_put(j, NULL); | |
| 2929 has_dead = true; | |
| 2930 } | |
| 2931 } | |
| 2932 } | |
| 2933 | |
| 2934 if (has_dead) { | |
| 2935 // iterate all instructions of the block and remove all null-values. | |
| 2936 int insert_point = 0; | |
| 2937 for (int j = 0; j < num_inst; j++) { | |
| 2938 LIR_Op* op = instructions->at(j); | |
| 2939 if (op != NULL) { | |
| 2940 if (insert_point != j) { | |
| 2941 instructions->at_put(insert_point, op); | |
| 2942 } | |
| 2943 insert_point++; | |
| 2944 } | |
| 2945 } | |
| 2946 instructions->truncate(insert_point); | |
| 2947 } | |
| 2948 } | |
| 2949 | |
| 2950 void LinearScan::assign_reg_num() { | |
| 2951 TIME_LINEAR_SCAN(timer_assign_reg_num); | |
| 2952 | |
| 2953 init_compute_debug_info(); | |
| 2954 IntervalWalker* iw = init_compute_oop_maps(); | |
| 2955 | |
| 2956 int num_blocks = block_count(); | |
| 2957 for (int i = 0; i < num_blocks; i++) { | |
| 2958 BlockBegin* block = block_at(i); | |
| 2959 assign_reg_num(block->lir()->instructions_list(), iw); | |
| 2960 } | |
| 2961 } | |
| 2962 | |
| 2963 | |
| 2964 void LinearScan::do_linear_scan() { | |
| 2965 NOT_PRODUCT(_total_timer.begin_method()); | |
| 2966 | |
| 2967 number_instructions(); | |
| 2968 | |
| 2969 NOT_PRODUCT(print_lir(1, "Before Register Allocation")); | |
| 2970 | |
| 2971 compute_local_live_sets(); | |
| 2972 compute_global_live_sets(); | |
| 2973 CHECK_BAILOUT(); | |
| 2974 | |
| 2975 build_intervals(); | |
| 2976 CHECK_BAILOUT(); | |
| 2977 sort_intervals_before_allocation(); | |
| 2978 | |
| 2979 NOT_PRODUCT(print_intervals("Before Register Allocation")); | |
| 2980 NOT_PRODUCT(LinearScanStatistic::compute(this, _stat_before_alloc)); | |
| 2981 | |
| 2982 allocate_registers(); | |
| 2983 CHECK_BAILOUT(); | |
| 2984 | |
| 2985 resolve_data_flow(); | |
| 2986 if (compilation()->has_exception_handlers()) { | |
| 2987 resolve_exception_handlers(); | |
| 2988 } | |
| 2989 // fill in number of spill slots into frame_map | |
| 2990 propagate_spill_slots(); | |
| 2991 CHECK_BAILOUT(); | |
| 2992 | |
| 2993 NOT_PRODUCT(print_intervals("After Register Allocation")); | |
| 2994 NOT_PRODUCT(print_lir(2, "LIR after register allocation:")); | |
| 2995 | |
| 2996 sort_intervals_after_allocation(); | |
|
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2997 |
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2998 DEBUG_ONLY(verify()); |
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2999 |
| 0 | 3000 eliminate_spill_moves(); |
| 3001 assign_reg_num(); | |
| 3002 CHECK_BAILOUT(); | |
| 3003 | |
| 3004 NOT_PRODUCT(print_lir(2, "LIR after assignment of register numbers:")); | |
| 3005 NOT_PRODUCT(LinearScanStatistic::compute(this, _stat_after_asign)); | |
| 3006 | |
| 3007 { TIME_LINEAR_SCAN(timer_allocate_fpu_stack); | |
| 3008 | |
| 3009 if (use_fpu_stack_allocation()) { | |
| 3010 allocate_fpu_stack(); // Only has effect on Intel | |
| 3011 NOT_PRODUCT(print_lir(2, "LIR after FPU stack allocation:")); | |
| 3012 } | |
| 3013 } | |
| 3014 | |
| 3015 { TIME_LINEAR_SCAN(timer_optimize_lir); | |
| 3016 | |
| 3017 EdgeMoveOptimizer::optimize(ir()->code()); | |
| 3018 ControlFlowOptimizer::optimize(ir()->code()); | |
| 3019 // check that cfg is still correct after optimizations | |
| 3020 ir()->verify(); | |
| 3021 } | |
| 3022 | |
| 3023 NOT_PRODUCT(print_lir(1, "Before Code Generation", false)); | |
| 3024 NOT_PRODUCT(LinearScanStatistic::compute(this, _stat_final)); | |
| 3025 NOT_PRODUCT(_total_timer.end_method(this)); | |
| 3026 } | |
| 3027 | |
| 3028 | |
| 3029 // ********** Printing functions | |
| 3030 | |
| 3031 #ifndef PRODUCT | |
| 3032 | |
| 3033 void LinearScan::print_timers(double total) { | |
| 3034 _total_timer.print(total); | |
| 3035 } | |
| 3036 | |
| 3037 void LinearScan::print_statistics() { | |
| 3038 _stat_before_alloc.print("before allocation"); | |
| 3039 _stat_after_asign.print("after assignment of register"); | |
| 3040 _stat_final.print("after optimization"); | |
| 3041 } | |
| 3042 | |
| 3043 void LinearScan::print_bitmap(BitMap& b) { | |
| 3044 for (unsigned int i = 0; i < b.size(); i++) { | |
| 3045 if (b.at(i)) tty->print("%d ", i); | |
| 3046 } | |
| 3047 tty->cr(); | |
| 3048 } | |
| 3049 | |
| 3050 void LinearScan::print_intervals(const char* label) { | |
| 3051 if (TraceLinearScanLevel >= 1) { | |
| 3052 int i; | |
| 3053 tty->cr(); | |
| 3054 tty->print_cr("%s", label); | |
| 3055 | |
| 3056 for (i = 0; i < interval_count(); i++) { | |
| 3057 Interval* interval = interval_at(i); | |
| 3058 if (interval != NULL) { | |
| 3059 interval->print(); | |
| 3060 } | |
| 3061 } | |
| 3062 | |
| 3063 tty->cr(); | |
| 3064 tty->print_cr("--- Basic Blocks ---"); | |
| 3065 for (i = 0; i < block_count(); i++) { | |
| 3066 BlockBegin* block = block_at(i); | |
| 3067 tty->print("B%d [%d, %d, %d, %d] ", block->block_id(), block->first_lir_instruction_id(), block->last_lir_instruction_id(), block->loop_index(), block->loop_depth()); | |
| 3068 } | |
| 3069 tty->cr(); | |
| 3070 tty->cr(); | |
| 3071 } | |
| 3072 | |
| 3073 if (PrintCFGToFile) { | |
| 3074 CFGPrinter::print_intervals(&_intervals, label); | |
| 3075 } | |
| 3076 } | |
| 3077 | |
| 3078 void LinearScan::print_lir(int level, const char* label, bool hir_valid) { | |
| 3079 if (TraceLinearScanLevel >= level) { | |
| 3080 tty->cr(); | |
| 3081 tty->print_cr("%s", label); | |
| 3082 print_LIR(ir()->linear_scan_order()); | |
| 3083 tty->cr(); | |
| 3084 } | |
| 3085 | |
| 3086 if (level == 1 && PrintCFGToFile) { | |
| 3087 CFGPrinter::print_cfg(ir()->linear_scan_order(), label, hir_valid, true); | |
| 3088 } | |
| 3089 } | |
| 3090 | |
| 3091 #endif //PRODUCT | |
| 3092 | |
| 3093 | |
| 3094 // ********** verification functions for allocation | |
| 3095 // (check that all intervals have a correct register and that no registers are overwritten) | |
| 3096 #ifdef ASSERT | |
| 3097 | |
| 3098 void LinearScan::verify() { | |
| 3099 TRACE_LINEAR_SCAN(2, tty->print_cr("********* verifying intervals ******************************************")); | |
| 3100 verify_intervals(); | |
| 3101 | |
| 3102 TRACE_LINEAR_SCAN(2, tty->print_cr("********* verifying that no oops are in fixed intervals ****************")); | |
| 3103 verify_no_oops_in_fixed_intervals(); | |
| 3104 | |
| 3105 TRACE_LINEAR_SCAN(2, tty->print_cr("********* verifying that unpinned constants are not alive across block boundaries")); | |
| 3106 verify_constants(); | |
| 3107 | |
| 3108 TRACE_LINEAR_SCAN(2, tty->print_cr("********* verifying register allocation ********************************")); | |
| 3109 verify_registers(); | |
| 3110 | |
| 3111 TRACE_LINEAR_SCAN(2, tty->print_cr("********* no errors found **********************************************")); | |
| 3112 } | |
| 3113 | |
| 3114 void LinearScan::verify_intervals() { | |
| 3115 int len = interval_count(); | |
| 3116 bool has_error = false; | |
| 3117 | |
| 3118 for (int i = 0; i < len; i++) { | |
| 3119 Interval* i1 = interval_at(i); | |
| 3120 if (i1 == NULL) continue; | |
| 3121 | |
| 3122 i1->check_split_children(); | |
| 3123 | |
| 3124 if (i1->reg_num() != i) { | |
| 3125 tty->print_cr("Interval %d is on position %d in list", i1->reg_num(), i); i1->print(); tty->cr(); | |
| 3126 has_error = true; | |
| 3127 } | |
| 3128 | |
| 3129 if (i1->reg_num() >= LIR_OprDesc::vreg_base && i1->type() == T_ILLEGAL) { | |
| 3130 tty->print_cr("Interval %d has no type assigned", i1->reg_num()); i1->print(); tty->cr(); | |
| 3131 has_error = true; | |
| 3132 } | |
| 3133 | |
| 3134 if (i1->assigned_reg() == any_reg) { | |
| 3135 tty->print_cr("Interval %d has no register assigned", i1->reg_num()); i1->print(); tty->cr(); | |
| 3136 has_error = true; | |
| 3137 } | |
| 3138 | |
| 3139 if (i1->assigned_reg() == i1->assigned_regHi()) { | |
| 3140 tty->print_cr("Interval %d: low and high register equal", i1->reg_num()); i1->print(); tty->cr(); | |
| 3141 has_error = true; | |
| 3142 } | |
| 3143 | |
| 3144 if (!is_processed_reg_num(i1->assigned_reg())) { | |
| 3145 tty->print_cr("Can not have an Interval for an ignored register"); i1->print(); tty->cr(); | |
| 3146 has_error = true; | |
| 3147 } | |
| 3148 | |
| 3149 if (i1->first() == Range::end()) { | |
| 3150 tty->print_cr("Interval %d has no Range", i1->reg_num()); i1->print(); tty->cr(); | |
| 3151 has_error = true; | |
| 3152 } | |
| 3153 | |
| 3154 for (Range* r = i1->first(); r != Range::end(); r = r->next()) { | |
| 3155 if (r->from() >= r->to()) { | |
| 3156 tty->print_cr("Interval %d has zero length range", i1->reg_num()); i1->print(); tty->cr(); | |
| 3157 has_error = true; | |
| 3158 } | |
| 3159 } | |
| 3160 | |
| 3161 for (int j = i + 1; j < len; j++) { | |
| 3162 Interval* i2 = interval_at(j); | |
| 3163 if (i2 == NULL) continue; | |
| 3164 | |
| 3165 // special intervals that are created in MoveResolver | |
| 3166 // -> ignore them because the range information has no meaning there | |
| 3167 if (i1->from() == 1 && i1->to() == 2) continue; | |
| 3168 if (i2->from() == 1 && i2->to() == 2) continue; | |
| 3169 | |
| 3170 int r1 = i1->assigned_reg(); | |
| 3171 int r1Hi = i1->assigned_regHi(); | |
| 3172 int r2 = i2->assigned_reg(); | |
| 3173 int r2Hi = i2->assigned_regHi(); | |
| 3174 if (i1->intersects(i2) && (r1 == r2 || r1 == r2Hi || (r1Hi != any_reg && (r1Hi == r2 || r1Hi == r2Hi)))) { | |
| 3175 tty->print_cr("Intervals %d and %d overlap and have the same register assigned", i1->reg_num(), i2->reg_num()); | |
| 3176 i1->print(); tty->cr(); | |
| 3177 i2->print(); tty->cr(); | |
| 3178 has_error = true; | |
| 3179 } | |
| 3180 } | |
| 3181 } | |
| 3182 | |
| 3183 assert(has_error == false, "register allocation invalid"); | |
| 3184 } | |
| 3185 | |
| 3186 | |
| 3187 void LinearScan::verify_no_oops_in_fixed_intervals() { | |
|
722
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|
3188 Interval* fixed_intervals; |
|
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|
3189 Interval* other_intervals; |
|
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|
3190 create_unhandled_lists(&fixed_intervals, &other_intervals, is_precolored_cpu_interval, NULL); |
|
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|
3191 |
|
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|
3192 // to ensure a walking until the last instruction id, add a dummy interval |
|
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|
3193 // with a high operation id |
|
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parents:
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|
3194 other_intervals = new Interval(any_reg); |
|
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|
3195 other_intervals->add_range(max_jint - 2, max_jint - 1); |
|
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parents:
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|
3196 IntervalWalker* iw = new IntervalWalker(this, fixed_intervals, other_intervals); |
|
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|
3197 |
| 0 | 3198 LIR_OpVisitState visitor; |
| 3199 for (int i = 0; i < block_count(); i++) { | |
| 3200 BlockBegin* block = block_at(i); | |
| 3201 | |
| 3202 LIR_OpList* instructions = block->lir()->instructions_list(); | |
| 3203 | |
| 3204 for (int j = 0; j < instructions->length(); j++) { | |
| 3205 LIR_Op* op = instructions->at(j); | |
| 3206 int op_id = op->id(); | |
| 3207 | |
| 3208 visitor.visit(op); | |
| 3209 | |
|
722
a134d9824964
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parents:
337
diff
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|
3210 if (visitor.info_count() > 0) { |
|
a134d9824964
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parents:
337
diff
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|
3211 iw->walk_before(op->id()); |
|
a134d9824964
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parents:
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diff
changeset
|
3212 bool check_live = true; |
|
a134d9824964
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parents:
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diff
changeset
|
3213 if (op->code() == lir_move) { |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
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parents:
337
diff
changeset
|
3214 LIR_Op1* move = (LIR_Op1*)op; |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
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parents:
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diff
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|
3215 check_live = (move->patch_code() == lir_patch_none); |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
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parents:
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diff
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|
3216 } |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
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parents:
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diff
changeset
|
3217 LIR_OpBranch* branch = op->as_OpBranch(); |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
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parents:
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diff
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|
3218 if (branch != NULL && branch->stub() != NULL && branch->stub()->is_exception_throw_stub()) { |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3219 // Don't bother checking the stub in this case since the |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
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parents:
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diff
changeset
|
3220 // exception stub will never return to normal control flow. |
|
a134d9824964
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parents:
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diff
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|
3221 check_live = false; |
|
a134d9824964
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parents:
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diff
changeset
|
3222 } |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
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parents:
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diff
changeset
|
3223 |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3224 // Make sure none of the fixed registers is live across an |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
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parents:
337
diff
changeset
|
3225 // oopmap since we can't handle that correctly. |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
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parents:
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diff
changeset
|
3226 if (check_live) { |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
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parents:
337
diff
changeset
|
3227 for (Interval* interval = iw->active_first(fixedKind); |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3228 interval != Interval::end(); |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3229 interval = interval->next()) { |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3230 if (interval->current_to() > op->id() + 1) { |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3231 // This interval is live out of this op so make sure |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3232 // that this interval represents some value that's |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
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parents:
337
diff
changeset
|
3233 // referenced by this op either as an input or output. |
|
a134d9824964
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never
parents:
337
diff
changeset
|
3234 bool ok = false; |
|
a134d9824964
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never
parents:
337
diff
changeset
|
3235 for_each_visitor_mode(mode) { |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3236 int n = visitor.opr_count(mode); |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3237 for (int k = 0; k < n; k++) { |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3238 LIR_Opr opr = visitor.opr_at(mode, k); |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3239 if (opr->is_fixed_cpu()) { |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3240 if (interval_at(reg_num(opr)) == interval) { |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3241 ok = true; |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3242 break; |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3243 } |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3244 int hi = reg_numHi(opr); |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3245 if (hi != -1 && interval_at(hi) == interval) { |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3246 ok = true; |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3247 break; |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3248 } |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3249 } |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3250 } |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3251 } |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3252 assert(ok, "fixed intervals should never be live across an oopmap point"); |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3253 } |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3254 } |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3255 } |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3256 } |
|
a134d9824964
6828024: verification of fixed interval usage is too weak
never
parents:
337
diff
changeset
|
3257 |
| 0 | 3258 // oop-maps at calls do not contain registers, so check is not needed |
| 3259 if (!visitor.has_call()) { | |
| 3260 | |
| 3261 for_each_visitor_mode(mode) { | |
| 3262 int n = visitor.opr_count(mode); | |
| 3263 for (int k = 0; k < n; k++) { | |
| 3264 LIR_Opr opr = visitor.opr_at(mode, k); | |
| 3265 | |
| 3266 if (opr->is_fixed_cpu() && opr->is_oop()) { | |
| 3267 // operand is a non-virtual cpu register and contains an oop | |
| 3268 TRACE_LINEAR_SCAN(4, op->print_on(tty); tty->print("checking operand "); opr->print(); tty->cr()); | |
| 3269 | |
| 3270 Interval* interval = interval_at(reg_num(opr)); | |
| 3271 assert(interval != NULL, "no interval"); | |
| 3272 | |
| 3273 if (mode == LIR_OpVisitState::inputMode) { | |
| 3274 if (interval->to() >= op_id + 1) { | |
| 3275 assert(interval->to() < op_id + 2 || | |
| 3276 interval->has_hole_between(op_id, op_id + 2), | |
| 3277 "oop input operand live after instruction"); | |
| 3278 } | |
| 3279 } else if (mode == LIR_OpVisitState::outputMode) { | |
| 3280 if (interval->from() <= op_id - 1) { | |
| 3281 assert(interval->has_hole_between(op_id - 1, op_id), | |
| 3282 "oop input operand live after instruction"); | |
| 3283 } | |
| 3284 } | |
| 3285 } | |
| 3286 } | |
| 3287 } | |
| 3288 } | |
| 3289 } | |
| 3290 } | |
| 3291 } | |
| 3292 | |
| 3293 | |
| 3294 void LinearScan::verify_constants() { | |
| 3295 int num_regs = num_virtual_regs(); | |
| 3296 int size = live_set_size(); | |
| 3297 int num_blocks = block_count(); | |
| 3298 | |
| 3299 for (int i = 0; i < num_blocks; i++) { | |
| 3300 BlockBegin* block = block_at(i); | |
| 3301 BitMap live_at_edge = block->live_in(); | |
| 3302 | |
| 3303 // visit all registers where the live_at_edge bit is set | |
| 304 | 3304 for (int r = (int)live_at_edge.get_next_one_offset(0, size); r < size; r = (int)live_at_edge.get_next_one_offset(r + 1, size)) { |
| 0 | 3305 TRACE_LINEAR_SCAN(4, tty->print("checking interval %d of block B%d", r, block->block_id())); |
| 3306 | |
| 3307 Value value = gen()->instruction_for_vreg(r); | |
| 3308 | |
| 3309 assert(value != NULL, "all intervals live across block boundaries must have Value"); | |
| 3310 assert(value->operand()->is_register() && value->operand()->is_virtual(), "value must have virtual operand"); | |
| 3311 assert(value->operand()->vreg_number() == r, "register number must match"); | |
| 3312 // TKR assert(value->as_Constant() == NULL || value->is_pinned(), "only pinned constants can be alive accross block boundaries"); | |
| 3313 } | |
| 3314 } | |
| 3315 } | |
| 3316 | |
| 3317 | |
| 3318 class RegisterVerifier: public StackObj { | |
| 3319 private: | |
| 3320 LinearScan* _allocator; | |
| 3321 BlockList _work_list; // all blocks that must be processed | |
| 3322 IntervalsList _saved_states; // saved information of previous check | |
| 3323 | |
| 3324 // simplified access to methods of LinearScan | |
| 3325 Compilation* compilation() const { return _allocator->compilation(); } | |
| 3326 Interval* interval_at(int reg_num) const { return _allocator->interval_at(reg_num); } | |
| 3327 int reg_num(LIR_Opr opr) const { return _allocator->reg_num(opr); } | |
| 3328 | |
| 3329 // currently, only registers are processed | |
| 3330 int state_size() { return LinearScan::nof_regs; } | |
| 3331 | |
| 3332 // accessors | |
| 3333 IntervalList* state_for_block(BlockBegin* block) { return _saved_states.at(block->block_id()); } | |
| 3334 void set_state_for_block(BlockBegin* block, IntervalList* saved_state) { _saved_states.at_put(block->block_id(), saved_state); } | |
| 3335 void add_to_work_list(BlockBegin* block) { if (!_work_list.contains(block)) _work_list.append(block); } | |
| 3336 | |
| 3337 // helper functions | |
| 3338 IntervalList* copy(IntervalList* input_state); | |
| 3339 void state_put(IntervalList* input_state, int reg, Interval* interval); | |
| 3340 bool check_state(IntervalList* input_state, int reg, Interval* interval); | |
| 3341 | |
| 3342 void process_block(BlockBegin* block); | |
| 3343 void process_xhandler(XHandler* xhandler, IntervalList* input_state); | |
| 3344 void process_successor(BlockBegin* block, IntervalList* input_state); | |
| 3345 void process_operations(LIR_List* ops, IntervalList* input_state); | |
| 3346 | |
| 3347 public: | |
| 3348 RegisterVerifier(LinearScan* allocator) | |
| 3349 : _allocator(allocator) | |
| 3350 , _work_list(16) | |
| 3351 , _saved_states(BlockBegin::number_of_blocks(), NULL) | |
| 3352 { } | |
| 3353 | |
| 3354 void verify(BlockBegin* start); | |
| 3355 }; | |
| 3356 | |
| 3357 | |
| 3358 // entry function from LinearScan that starts the verification | |
| 3359 void LinearScan::verify_registers() { | |
| 3360 RegisterVerifier verifier(this); | |
| 3361 verifier.verify(block_at(0)); | |
| 3362 } | |
| 3363 | |
| 3364 | |
| 3365 void RegisterVerifier::verify(BlockBegin* start) { | |
| 3366 // setup input registers (method arguments) for first block | |
| 3367 IntervalList* input_state = new IntervalList(state_size(), NULL); | |
| 3368 CallingConvention* args = compilation()->frame_map()->incoming_arguments(); | |
| 3369 for (int n = 0; n < args->length(); n++) { | |
| 3370 LIR_Opr opr = args->at(n); | |
| 3371 if (opr->is_register()) { | |
| 3372 Interval* interval = interval_at(reg_num(opr)); | |
| 3373 | |
| 3374 if (interval->assigned_reg() < state_size()) { | |
| 3375 input_state->at_put(interval->assigned_reg(), interval); | |
| 3376 } | |
| 3377 if (interval->assigned_regHi() != LinearScan::any_reg && interval->assigned_regHi() < state_size()) { | |
| 3378 input_state->at_put(interval->assigned_regHi(), interval); | |
| 3379 } | |
| 3380 } | |
| 3381 } | |
| 3382 | |
| 3383 set_state_for_block(start, input_state); | |
| 3384 add_to_work_list(start); | |
| 3385 | |
| 3386 // main loop for verification | |
| 3387 do { | |
| 3388 BlockBegin* block = _work_list.at(0); | |
| 3389 _work_list.remove_at(0); | |
| 3390 | |
| 3391 process_block(block); | |
| 3392 } while (!_work_list.is_empty()); | |
| 3393 } | |
| 3394 | |
| 3395 void RegisterVerifier::process_block(BlockBegin* block) { | |
| 3396 TRACE_LINEAR_SCAN(2, tty->cr(); tty->print_cr("process_block B%d", block->block_id())); | |
| 3397 | |
| 3398 // must copy state because it is modified | |
| 3399 IntervalList* input_state = copy(state_for_block(block)); | |
| 3400 | |
| 3401 if (TraceLinearScanLevel >= 4) { | |
| 3402 tty->print_cr("Input-State of intervals:"); | |
| 3403 tty->print(" "); | |
| 3404 for (int i = 0; i < state_size(); i++) { | |
| 3405 if (input_state->at(i) != NULL) { | |
| 3406 tty->print(" %4d", input_state->at(i)->reg_num()); | |
| 3407 } else { | |
| 3408 tty->print(" __"); | |
| 3409 } | |
| 3410 } | |
| 3411 tty->cr(); | |
| 3412 tty->cr(); | |
| 3413 } | |
| 3414 | |
| 3415 // process all operations of the block | |
| 3416 process_operations(block->lir(), input_state); | |
| 3417 | |
| 3418 // iterate all successors | |
| 3419 for (int i = 0; i < block->number_of_sux(); i++) { | |
| 3420 process_successor(block->sux_at(i), input_state); | |
| 3421 } | |
| 3422 } | |
| 3423 | |
| 3424 void RegisterVerifier::process_xhandler(XHandler* xhandler, IntervalList* input_state) { | |
| 3425 TRACE_LINEAR_SCAN(2, tty->print_cr("process_xhandler B%d", xhandler->entry_block()->block_id())); | |
| 3426 | |
| 3427 // must copy state because it is modified | |
| 3428 input_state = copy(input_state); | |
| 3429 | |
| 3430 if (xhandler->entry_code() != NULL) { | |
| 3431 process_operations(xhandler->entry_code(), input_state); | |
| 3432 } | |
| 3433 process_successor(xhandler->entry_block(), input_state); | |
| 3434 } | |
| 3435 | |
| 3436 void RegisterVerifier::process_successor(BlockBegin* block, IntervalList* input_state) { | |
| 3437 IntervalList* saved_state = state_for_block(block); | |
| 3438 | |
| 3439 if (saved_state != NULL) { | |
| 3440 // this block was already processed before. | |
| 3441 // check if new input_state is consistent with saved_state | |
| 3442 | |
| 3443 bool saved_state_correct = true; | |
| 3444 for (int i = 0; i < state_size(); i++) { | |
| 3445 if (input_state->at(i) != saved_state->at(i)) { | |
| 3446 // current input_state and previous saved_state assume a different | |
| 3447 // interval in this register -> assume that this register is invalid | |
| 3448 if (saved_state->at(i) != NULL) { | |
| 3449 // invalidate old calculation only if it assumed that | |
| 3450 // register was valid. when the register was already invalid, | |
| 3451 // then the old calculation was correct. | |
| 3452 saved_state_correct = false; | |
| 3453 saved_state->at_put(i, NULL); | |
| 3454 | |
| 3455 TRACE_LINEAR_SCAN(4, tty->print_cr("process_successor B%d: invalidating slot %d", block->block_id(), i)); | |
| 3456 } | |
| 3457 } | |
| 3458 } | |
| 3459 | |
| 3460 if (saved_state_correct) { | |
| 3461 // already processed block with correct input_state | |
| 3462 TRACE_LINEAR_SCAN(2, tty->print_cr("process_successor B%d: previous visit already correct", block->block_id())); | |
| 3463 } else { | |
| 3464 // must re-visit this block | |
| 3465 TRACE_LINEAR_SCAN(2, tty->print_cr("process_successor B%d: must re-visit because input state changed", block->block_id())); | |
| 3466 add_to_work_list(block); | |
| 3467 } | |
| 3468 | |
| 3469 } else { | |
| 3470 // block was not processed before, so set initial input_state | |
| 3471 TRACE_LINEAR_SCAN(2, tty->print_cr("process_successor B%d: initial visit", block->block_id())); | |
| 3472 | |
| 3473 set_state_for_block(block, copy(input_state)); | |
| 3474 add_to_work_list(block); | |
| 3475 } | |
| 3476 } | |
| 3477 | |
| 3478 | |
| 3479 IntervalList* RegisterVerifier::copy(IntervalList* input_state) { | |
| 3480 IntervalList* copy_state = new IntervalList(input_state->length()); | |
| 3481 copy_state->push_all(input_state); | |
| 3482 return copy_state; | |
| 3483 } | |
| 3484 | |
| 3485 void RegisterVerifier::state_put(IntervalList* input_state, int reg, Interval* interval) { | |
| 3486 if (reg != LinearScan::any_reg && reg < state_size()) { | |
| 3487 if (interval != NULL) { | |
| 3488 TRACE_LINEAR_SCAN(4, tty->print_cr(" reg[%d] = %d", reg, interval->reg_num())); | |
| 3489 } else if (input_state->at(reg) != NULL) { | |
| 3490 TRACE_LINEAR_SCAN(4, tty->print_cr(" reg[%d] = NULL", reg)); | |
| 3491 } | |
| 3492 | |
| 3493 input_state->at_put(reg, interval); | |
| 3494 } | |
| 3495 } | |
| 3496 | |
| 3497 bool RegisterVerifier::check_state(IntervalList* input_state, int reg, Interval* interval) { | |
| 3498 if (reg != LinearScan::any_reg && reg < state_size()) { | |
| 3499 if (input_state->at(reg) != interval) { | |
| 3500 tty->print_cr("!! Error in register allocation: register %d does not contain interval %d", reg, interval->reg_num()); | |
| 3501 return true; | |
| 3502 } | |
| 3503 } | |
| 3504 return false; | |
| 3505 } | |
| 3506 | |
| 3507 void RegisterVerifier::process_operations(LIR_List* ops, IntervalList* input_state) { | |
| 3508 // visit all instructions of the block | |
| 3509 LIR_OpVisitState visitor; | |
| 3510 bool has_error = false; | |
| 3511 | |
| 3512 for (int i = 0; i < ops->length(); i++) { | |
| 3513 LIR_Op* op = ops->at(i); | |
| 3514 visitor.visit(op); | |
| 3515 | |
| 3516 TRACE_LINEAR_SCAN(4, op->print_on(tty)); | |
| 3517 | |
| 3518 // check if input operands are correct | |
| 3519 int j; | |
| 3520 int n = visitor.opr_count(LIR_OpVisitState::inputMode); | |
| 3521 for (j = 0; j < n; j++) { | |
| 3522 LIR_Opr opr = visitor.opr_at(LIR_OpVisitState::inputMode, j); | |
| 3523 if (opr->is_register() && LinearScan::is_processed_reg_num(reg_num(opr))) { | |
| 3524 Interval* interval = interval_at(reg_num(opr)); | |
| 3525 if (op->id() != -1) { | |
| 3526 interval = interval->split_child_at_op_id(op->id(), LIR_OpVisitState::inputMode); | |
| 3527 } | |
| 3528 | |
| 3529 has_error |= check_state(input_state, interval->assigned_reg(), interval->split_parent()); | |
| 3530 has_error |= check_state(input_state, interval->assigned_regHi(), interval->split_parent()); | |
| 3531 | |
| 3532 // When an operand is marked with is_last_use, then the fpu stack allocator | |
| 3533 // removes the register from the fpu stack -> the register contains no value | |
| 3534 if (opr->is_last_use()) { | |
| 3535 state_put(input_state, interval->assigned_reg(), NULL); | |
| 3536 state_put(input_state, interval->assigned_regHi(), NULL); | |
| 3537 } | |
| 3538 } | |
| 3539 } | |
| 3540 | |
| 3541 // invalidate all caller save registers at calls | |
| 3542 if (visitor.has_call()) { | |
| 3543 for (j = 0; j < FrameMap::nof_caller_save_cpu_regs; j++) { | |
| 3544 state_put(input_state, reg_num(FrameMap::caller_save_cpu_reg_at(j)), NULL); | |
| 3545 } | |
| 3546 for (j = 0; j < FrameMap::nof_caller_save_fpu_regs; j++) { | |
| 3547 state_put(input_state, reg_num(FrameMap::caller_save_fpu_reg_at(j)), NULL); | |
| 3548 } | |
| 3549 | |
| 304 | 3550 #ifdef X86 |
| 0 | 3551 for (j = 0; j < FrameMap::nof_caller_save_xmm_regs; j++) { |
| 3552 state_put(input_state, reg_num(FrameMap::caller_save_xmm_reg_at(j)), NULL); | |
| 3553 } | |
| 3554 #endif | |
| 3555 } | |
| 3556 | |
| 3557 // process xhandler before output and temp operands | |
| 3558 XHandlers* xhandlers = visitor.all_xhandler(); | |
| 3559 n = xhandlers->length(); | |
| 3560 for (int k = 0; k < n; k++) { | |
| 3561 process_xhandler(xhandlers->handler_at(k), input_state); | |
| 3562 } | |
| 3563 | |
| 3564 // set temp operands (some operations use temp operands also as output operands, so can't set them NULL) | |
| 3565 n = visitor.opr_count(LIR_OpVisitState::tempMode); | |
| 3566 for (j = 0; j < n; j++) { | |
| 3567 LIR_Opr opr = visitor.opr_at(LIR_OpVisitState::tempMode, j); | |
| 3568 if (opr->is_register() && LinearScan::is_processed_reg_num(reg_num(opr))) { | |
| 3569 Interval* interval = interval_at(reg_num(opr)); | |
| 3570 if (op->id() != -1) { | |
| 3571 interval = interval->split_child_at_op_id(op->id(), LIR_OpVisitState::tempMode); | |
| 3572 } | |
| 3573 | |
| 3574 state_put(input_state, interval->assigned_reg(), interval->split_parent()); | |
| 3575 state_put(input_state, interval->assigned_regHi(), interval->split_parent()); | |
| 3576 } | |
| 3577 } | |
| 3578 | |
| 3579 // set output operands | |
| 3580 n = visitor.opr_count(LIR_OpVisitState::outputMode); | |
| 3581 for (j = 0; j < n; j++) { | |
| 3582 LIR_Opr opr = visitor.opr_at(LIR_OpVisitState::outputMode, j); | |
| 3583 if (opr->is_register() && LinearScan::is_processed_reg_num(reg_num(opr))) { | |
| 3584 Interval* interval = interval_at(reg_num(opr)); | |
| 3585 if (op->id() != -1) { | |
| 3586 interval = interval->split_child_at_op_id(op->id(), LIR_OpVisitState::outputMode); | |
| 3587 } | |
| 3588 | |
| 3589 state_put(input_state, interval->assigned_reg(), interval->split_parent()); | |
| 3590 state_put(input_state, interval->assigned_regHi(), interval->split_parent()); | |
| 3591 } | |
| 3592 } | |
| 3593 } | |
| 3594 assert(has_error == false, "Error in register allocation"); | |
| 3595 } | |
| 3596 | |
| 3597 #endif // ASSERT | |
| 3598 | |
| 3599 | |
| 3600 | |
| 3601 // **** Implementation of MoveResolver ****************************** | |
| 3602 | |
| 3603 MoveResolver::MoveResolver(LinearScan* allocator) : | |
| 3604 _allocator(allocator), | |
| 3605 _multiple_reads_allowed(false), | |
| 3606 _mapping_from(8), | |
| 3607 _mapping_from_opr(8), | |
| 3608 _mapping_to(8), | |
| 3609 _insert_list(NULL), | |
| 3610 _insert_idx(-1), | |
| 3611 _insertion_buffer() | |
| 3612 { | |
| 3613 for (int i = 0; i < LinearScan::nof_regs; i++) { | |
| 3614 _register_blocked[i] = 0; | |
| 3615 } | |
| 3616 DEBUG_ONLY(check_empty()); | |
| 3617 } | |
| 3618 | |
| 3619 | |
| 3620 #ifdef ASSERT | |
| 3621 | |
| 3622 void MoveResolver::check_empty() { | |
| 3623 assert(_mapping_from.length() == 0 && _mapping_from_opr.length() == 0 && _mapping_to.length() == 0, "list must be empty before and after processing"); | |
| 3624 for (int i = 0; i < LinearScan::nof_regs; i++) { | |
| 3625 assert(register_blocked(i) == 0, "register map must be empty before and after processing"); | |
| 3626 } | |
| 3627 assert(_multiple_reads_allowed == false, "must have default value"); | |
| 3628 } | |
| 3629 | |
| 3630 void MoveResolver::verify_before_resolve() { | |
| 3631 assert(_mapping_from.length() == _mapping_from_opr.length(), "length must be equal"); | |
| 3632 assert(_mapping_from.length() == _mapping_to.length(), "length must be equal"); | |
| 3633 assert(_insert_list != NULL && _insert_idx != -1, "insert position not set"); | |
| 3634 | |
| 3635 int i, j; | |
| 3636 if (!_multiple_reads_allowed) { | |
| 3637 for (i = 0; i < _mapping_from.length(); i++) { | |
| 3638 for (j = i + 1; j < _mapping_from.length(); j++) { | |
| 3639 assert(_mapping_from.at(i) == NULL || _mapping_from.at(i) != _mapping_from.at(j), "cannot read from same interval twice"); | |
| 3640 } | |
| 3641 } | |
| 3642 } | |
| 3643 | |
| 3644 for (i = 0; i < _mapping_to.length(); i++) { | |
| 3645 for (j = i + 1; j < _mapping_to.length(); j++) { | |
| 3646 assert(_mapping_to.at(i) != _mapping_to.at(j), "cannot write to same interval twice"); | |
| 3647 } | |
| 3648 } | |
| 3649 | |
| 3650 | |
| 3651 BitMap used_regs(LinearScan::nof_regs + allocator()->frame_map()->argcount() + allocator()->max_spills()); | |
| 3652 used_regs.clear(); | |
| 3653 if (!_multiple_reads_allowed) { | |
| 3654 for (i = 0; i < _mapping_from.length(); i++) { | |
| 3655 Interval* it = _mapping_from.at(i); | |
| 3656 if (it != NULL) { | |
| 3657 assert(!used_regs.at(it->assigned_reg()), "cannot read from same register twice"); | |
| 3658 used_regs.set_bit(it->assigned_reg()); | |
| 3659 | |
| 3660 if (it->assigned_regHi() != LinearScan::any_reg) { | |
| 3661 assert(!used_regs.at(it->assigned_regHi()), "cannot read from same register twice"); | |
| 3662 used_regs.set_bit(it->assigned_regHi()); | |
| 3663 } | |
| 3664 } | |
| 3665 } | |
| 3666 } | |
| 3667 | |
| 3668 used_regs.clear(); | |
| 3669 for (i = 0; i < _mapping_to.length(); i++) { | |
| 3670 Interval* it = _mapping_to.at(i); | |
| 3671 assert(!used_regs.at(it->assigned_reg()), "cannot write to same register twice"); | |
| 3672 used_regs.set_bit(it->assigned_reg()); | |
| 3673 | |
| 3674 if (it->assigned_regHi() != LinearScan::any_reg) { | |
| 3675 assert(!used_regs.at(it->assigned_regHi()), "cannot write to same register twice"); | |
| 3676 used_regs.set_bit(it->assigned_regHi()); | |
| 3677 } | |
| 3678 } | |
| 3679 | |
| 3680 used_regs.clear(); | |
| 3681 for (i = 0; i < _mapping_from.length(); i++) { | |
| 3682 Interval* it = _mapping_from.at(i); | |
| 3683 if (it != NULL && it->assigned_reg() >= LinearScan::nof_regs) { | |
| 3684 used_regs.set_bit(it->assigned_reg()); | |
| 3685 } | |
| 3686 } | |
| 3687 for (i = 0; i < _mapping_to.length(); i++) { | |
| 3688 Interval* it = _mapping_to.at(i); | |
| 3689 assert(!used_regs.at(it->assigned_reg()) || it->assigned_reg() == _mapping_from.at(i)->assigned_reg(), "stack slots used in _mapping_from must be disjoint to _mapping_to"); | |
| 3690 } | |
| 3691 } | |
| 3692 | |
| 3693 #endif // ASSERT | |
| 3694 | |
| 3695 | |
| 3696 // mark assigned_reg and assigned_regHi of the interval as blocked | |
| 3697 void MoveResolver::block_registers(Interval* it) { | |
| 3698 int reg = it->assigned_reg(); | |
| 3699 if (reg < LinearScan::nof_regs) { | |
| 3700 assert(_multiple_reads_allowed || register_blocked(reg) == 0, "register already marked as used"); | |
| 3701 set_register_blocked(reg, 1); | |
| 3702 } | |
| 3703 reg = it->assigned_regHi(); | |
| 3704 if (reg != LinearScan::any_reg && reg < LinearScan::nof_regs) { | |
| 3705 assert(_multiple_reads_allowed || register_blocked(reg) == 0, "register already marked as used"); | |
| 3706 set_register_blocked(reg, 1); | |
| 3707 } | |
| 3708 } | |
| 3709 | |
| 3710 // mark assigned_reg and assigned_regHi of the interval as unblocked | |
| 3711 void MoveResolver::unblock_registers(Interval* it) { | |
| 3712 int reg = it->assigned_reg(); | |
| 3713 if (reg < LinearScan::nof_regs) { | |
| 3714 assert(register_blocked(reg) > 0, "register already marked as unused"); | |
| 3715 set_register_blocked(reg, -1); | |
| 3716 } | |
| 3717 reg = it->assigned_regHi(); | |
| 3718 if (reg != LinearScan::any_reg && reg < LinearScan::nof_regs) { | |
| 3719 assert(register_blocked(reg) > 0, "register already marked as unused"); | |
| 3720 set_register_blocked(reg, -1); | |
| 3721 } | |
| 3722 } | |
| 3723 | |
| 3724 // check if assigned_reg and assigned_regHi of the to-interval are not blocked (or only blocked by from) | |
| 3725 bool MoveResolver::save_to_process_move(Interval* from, Interval* to) { | |
| 3726 int from_reg = -1; | |
| 3727 int from_regHi = -1; | |
| 3728 if (from != NULL) { | |
| 3729 from_reg = from->assigned_reg(); | |
| 3730 from_regHi = from->assigned_regHi(); | |
| 3731 } | |
| 3732 | |
| 3733 int reg = to->assigned_reg(); | |
| 3734 if (reg < LinearScan::nof_regs) { | |
| 3735 if (register_blocked(reg) > 1 || (register_blocked(reg) == 1 && reg != from_reg && reg != from_regHi)) { | |
| 3736 return false; | |
| 3737 } | |
| 3738 } | |
| 3739 reg = to->assigned_regHi(); | |
| 3740 if (reg != LinearScan::any_reg && reg < LinearScan::nof_regs) { | |
| 3741 if (register_blocked(reg) > 1 || (register_blocked(reg) == 1 && reg != from_reg && reg != from_regHi)) { | |
| 3742 return false; | |
| 3743 } | |
| 3744 } | |
| 3745 | |
| 3746 return true; | |
| 3747 } | |
| 3748 | |
| 3749 | |
| 3750 void MoveResolver::create_insertion_buffer(LIR_List* list) { | |
| 3751 assert(!_insertion_buffer.initialized(), "overwriting existing buffer"); | |
| 3752 _insertion_buffer.init(list); | |
| 3753 } | |
| 3754 | |
| 3755 void MoveResolver::append_insertion_buffer() { | |
| 3756 if (_insertion_buffer.initialized()) { | |
| 3757 _insertion_buffer.lir_list()->append(&_insertion_buffer); | |
| 3758 } | |
| 3759 assert(!_insertion_buffer.initialized(), "must be uninitialized now"); | |
| 3760 | |
| 3761 _insert_list = NULL; | |
| 3762 _insert_idx = -1; | |
| 3763 } | |
| 3764 | |
| 3765 void MoveResolver::insert_move(Interval* from_interval, Interval* to_interval) { | |
| 3766 assert(from_interval->reg_num() != to_interval->reg_num(), "from and to interval equal"); | |
| 3767 assert(from_interval->type() == to_interval->type(), "move between different types"); | |
| 3768 assert(_insert_list != NULL && _insert_idx != -1, "must setup insert position first"); | |
| 3769 assert(_insertion_buffer.lir_list() == _insert_list, "wrong insertion buffer"); | |
| 3770 | |
| 3771 LIR_Opr from_opr = LIR_OprFact::virtual_register(from_interval->reg_num(), from_interval->type()); | |
| 3772 LIR_Opr to_opr = LIR_OprFact::virtual_register(to_interval->reg_num(), to_interval->type()); | |
| 3773 | |
| 3774 if (!_multiple_reads_allowed) { | |
| 3775 // the last_use flag is an optimization for FPU stack allocation. When the same | |
| 3776 // input interval is used in more than one move, then it is too difficult to determine | |
| 3777 // if this move is really the last use. | |
| 3778 from_opr = from_opr->make_last_use(); | |
| 3779 } | |
| 3780 _insertion_buffer.move(_insert_idx, from_opr, to_opr); | |
| 3781 | |
| 3782 TRACE_LINEAR_SCAN(4, tty->print_cr("MoveResolver: inserted move from register %d (%d, %d) to %d (%d, %d)", from_interval->reg_num(), from_interval->assigned_reg(), from_interval->assigned_regHi(), to_interval->reg_num(), to_interval->assigned_reg(), to_interval->assigned_regHi())); | |
| 3783 } | |
| 3784 | |
| 3785 void MoveResolver::insert_move(LIR_Opr from_opr, Interval* to_interval) { | |
| 3786 assert(from_opr->type() == to_interval->type(), "move between different types"); | |
| 3787 assert(_insert_list != NULL && _insert_idx != -1, "must setup insert position first"); | |
| 3788 assert(_insertion_buffer.lir_list() == _insert_list, "wrong insertion buffer"); | |
| 3789 | |
| 3790 LIR_Opr to_opr = LIR_OprFact::virtual_register(to_interval->reg_num(), to_interval->type()); | |
| 3791 _insertion_buffer.move(_insert_idx, from_opr, to_opr); | |
| 3792 | |
| 3793 TRACE_LINEAR_SCAN(4, tty->print("MoveResolver: inserted move from constant "); from_opr->print(); tty->print_cr(" to %d (%d, %d)", to_interval->reg_num(), to_interval->assigned_reg(), to_interval->assigned_regHi())); | |
| 3794 } | |
| 3795 | |
| 3796 | |
| 3797 void MoveResolver::resolve_mappings() { | |
| 3798 TRACE_LINEAR_SCAN(4, tty->print_cr("MoveResolver: resolving mappings for Block B%d, index %d", _insert_list->block() != NULL ? _insert_list->block()->block_id() : -1, _insert_idx)); | |
| 3799 DEBUG_ONLY(verify_before_resolve()); | |
| 3800 | |
| 3801 // Block all registers that are used as input operands of a move. | |
| 3802 // When a register is blocked, no move to this register is emitted. | |
| 3803 // This is necessary for detecting cycles in moves. | |
| 3804 int i; | |
| 3805 for (i = _mapping_from.length() - 1; i >= 0; i--) { | |
| 3806 Interval* from_interval = _mapping_from.at(i); | |
| 3807 if (from_interval != NULL) { | |
| 3808 block_registers(from_interval); | |
| 3809 } | |
| 3810 } | |
| 3811 | |
| 3812 int spill_candidate = -1; | |
| 3813 while (_mapping_from.length() > 0) { | |
| 3814 bool processed_interval = false; | |
| 3815 | |
| 3816 for (i = _mapping_from.length() - 1; i >= 0; i--) { | |
| 3817 Interval* from_interval = _mapping_from.at(i); | |
| 3818 Interval* to_interval = _mapping_to.at(i); | |
| 3819 | |
| 3820 if (save_to_process_move(from_interval, to_interval)) { | |
| 3821 // this inverval can be processed because target is free | |
| 3822 if (from_interval != NULL) { | |
| 3823 insert_move(from_interval, to_interval); | |
| 3824 unblock_registers(from_interval); | |
| 3825 } else { | |
| 3826 insert_move(_mapping_from_opr.at(i), to_interval); | |
| 3827 } | |
| 3828 _mapping_from.remove_at(i); | |
| 3829 _mapping_from_opr.remove_at(i); | |
| 3830 _mapping_to.remove_at(i); | |
| 3831 | |
| 3832 processed_interval = true; | |
| 3833 } else if (from_interval != NULL && from_interval->assigned_reg() < LinearScan::nof_regs) { | |
| 3834 // this interval cannot be processed now because target is not free | |
| 3835 // it starts in a register, so it is a possible candidate for spilling | |
| 3836 spill_candidate = i; | |
| 3837 } | |
| 3838 } | |
| 3839 | |
| 3840 if (!processed_interval) { | |
| 3841 // no move could be processed because there is a cycle in the move list | |
| 3842 // (e.g. r1 -> r2, r2 -> r1), so one interval must be spilled to memory | |
| 3843 assert(spill_candidate != -1, "no interval in register for spilling found"); | |
| 3844 | |
| 3845 // create a new spill interval and assign a stack slot to it | |
| 3846 Interval* from_interval = _mapping_from.at(spill_candidate); | |
| 3847 Interval* spill_interval = new Interval(-1); | |
| 3848 spill_interval->set_type(from_interval->type()); | |
| 3849 | |
| 3850 // add a dummy range because real position is difficult to calculate | |
| 3851 // Note: this range is a special case when the integrity of the allocation is checked | |
| 3852 spill_interval->add_range(1, 2); | |
| 3853 | |
| 3854 // do not allocate a new spill slot for temporary interval, but | |
| 3855 // use spill slot assigned to from_interval. Otherwise moves from | |
| 3856 // one stack slot to another can happen (not allowed by LIR_Assembler | |
| 3857 int spill_slot = from_interval->canonical_spill_slot(); | |
| 3858 if (spill_slot < 0) { | |
| 3859 spill_slot = allocator()->allocate_spill_slot(type2spill_size[spill_interval->type()] == 2); | |
| 3860 from_interval->set_canonical_spill_slot(spill_slot); | |
| 3861 } | |
| 3862 spill_interval->assign_reg(spill_slot); | |
| 3863 allocator()->append_interval(spill_interval); | |
| 3864 | |
| 3865 TRACE_LINEAR_SCAN(4, tty->print_cr("created new Interval %d for spilling", spill_interval->reg_num())); | |
| 3866 | |
| 3867 // insert a move from register to stack and update the mapping | |
| 3868 insert_move(from_interval, spill_interval); | |
| 3869 _mapping_from.at_put(spill_candidate, spill_interval); | |
| 3870 unblock_registers(from_interval); | |
| 3871 } | |
| 3872 } | |
| 3873 | |
| 3874 // reset to default value | |
| 3875 _multiple_reads_allowed = false; | |
| 3876 | |
| 3877 // check that all intervals have been processed | |
| 3878 DEBUG_ONLY(check_empty()); | |
| 3879 } | |
| 3880 | |
| 3881 | |
| 3882 void MoveResolver::set_insert_position(LIR_List* insert_list, int insert_idx) { | |
| 3883 TRACE_LINEAR_SCAN(4, tty->print_cr("MoveResolver: setting insert position to Block B%d, index %d", insert_list->block() != NULL ? insert_list->block()->block_id() : -1, insert_idx)); | |
| 3884 assert(_insert_list == NULL && _insert_idx == -1, "use move_insert_position instead of set_insert_position when data already set"); | |
| 3885 | |
| 3886 create_insertion_buffer(insert_list); | |
| 3887 _insert_list = insert_list; | |
| 3888 _insert_idx = insert_idx; | |
| 3889 } | |
| 3890 | |
| 3891 void MoveResolver::move_insert_position(LIR_List* insert_list, int insert_idx) { | |
| 3892 TRACE_LINEAR_SCAN(4, tty->print_cr("MoveResolver: moving insert position to Block B%d, index %d", insert_list->block() != NULL ? insert_list->block()->block_id() : -1, insert_idx)); | |
| 3893 | |
| 3894 if (_insert_list != NULL && (insert_list != _insert_list || insert_idx != _insert_idx)) { | |
| 3895 // insert position changed -> resolve current mappings | |
| 3896 resolve_mappings(); | |
| 3897 } | |
| 3898 | |
| 3899 if (insert_list != _insert_list) { | |
| 3900 // block changed -> append insertion_buffer because it is | |
| 3901 // bound to a specific block and create a new insertion_buffer | |
| 3902 append_insertion_buffer(); | |
| 3903 create_insertion_buffer(insert_list); | |
| 3904 } | |
| 3905 | |
| 3906 _insert_list = insert_list; | |
| 3907 _insert_idx = insert_idx; | |
| 3908 } | |
| 3909 | |
| 3910 void MoveResolver::add_mapping(Interval* from_interval, Interval* to_interval) { | |
| 3911 TRACE_LINEAR_SCAN(4, tty->print_cr("MoveResolver: adding mapping from %d (%d, %d) to %d (%d, %d)", from_interval->reg_num(), from_interval->assigned_reg(), from_interval->assigned_regHi(), to_interval->reg_num(), to_interval->assigned_reg(), to_interval->assigned_regHi())); | |
| 3912 | |
| 3913 _mapping_from.append(from_interval); | |
| 3914 _mapping_from_opr.append(LIR_OprFact::illegalOpr); | |
| 3915 _mapping_to.append(to_interval); | |
| 3916 } | |
| 3917 | |
| 3918 | |
| 3919 void MoveResolver::add_mapping(LIR_Opr from_opr, Interval* to_interval) { | |
| 3920 TRACE_LINEAR_SCAN(4, tty->print("MoveResolver: adding mapping from "); from_opr->print(); tty->print_cr(" to %d (%d, %d)", to_interval->reg_num(), to_interval->assigned_reg(), to_interval->assigned_regHi())); | |
| 3921 assert(from_opr->is_constant(), "only for constants"); | |
| 3922 | |
| 3923 _mapping_from.append(NULL); | |
| 3924 _mapping_from_opr.append(from_opr); | |
| 3925 _mapping_to.append(to_interval); | |
| 3926 } | |
| 3927 | |
| 3928 void MoveResolver::resolve_and_append_moves() { | |
| 3929 if (has_mappings()) { | |
| 3930 resolve_mappings(); | |
| 3931 } | |
| 3932 append_insertion_buffer(); | |
| 3933 } | |
| 3934 | |
| 3935 | |
| 3936 | |
| 3937 // **** Implementation of Range ************************************* | |
| 3938 | |
| 3939 Range::Range(int from, int to, Range* next) : | |
| 3940 _from(from), | |
| 3941 _to(to), | |
| 3942 _next(next) | |
| 3943 { | |
| 3944 } | |
| 3945 | |
| 3946 // initialize sentinel | |
| 3947 Range* Range::_end = NULL; | |
| 1584 | 3948 void Range::initialize(Arena* arena) { |
| 3949 _end = new (arena) Range(max_jint, max_jint, NULL); | |
| 0 | 3950 } |
| 3951 | |
| 3952 int Range::intersects_at(Range* r2) const { | |
| 3953 const Range* r1 = this; | |
| 3954 | |
| 3955 assert(r1 != NULL && r2 != NULL, "null ranges not allowed"); | |
| 3956 assert(r1 != _end && r2 != _end, "empty ranges not allowed"); | |
| 3957 | |
| 3958 do { | |
| 3959 if (r1->from() < r2->from()) { | |
| 3960 if (r1->to() <= r2->from()) { | |
| 3961 r1 = r1->next(); if (r1 == _end) return -1; | |
| 3962 } else { | |
| 3963 return r2->from(); | |
| 3964 } | |
| 3965 } else if (r2->from() < r1->from()) { | |
| 3966 if (r2->to() <= r1->from()) { | |
| 3967 r2 = r2->next(); if (r2 == _end) return -1; | |
| 3968 } else { | |
| 3969 return r1->from(); | |
| 3970 } | |
| 3971 } else { // r1->from() == r2->from() | |
| 3972 if (r1->from() == r1->to()) { | |
| 3973 r1 = r1->next(); if (r1 == _end) return -1; | |
| 3974 } else if (r2->from() == r2->to()) { | |
| 3975 r2 = r2->next(); if (r2 == _end) return -1; | |
| 3976 } else { | |
| 3977 return r1->from(); | |
| 3978 } | |
| 3979 } | |
| 3980 } while (true); | |
| 3981 } | |
| 3982 | |
| 3983 #ifndef PRODUCT | |
| 3984 void Range::print(outputStream* out) const { | |
| 3985 out->print("[%d, %d[ ", _from, _to); | |
| 3986 } | |
| 3987 #endif | |
| 3988 | |
| 3989 | |
| 3990 | |
| 3991 // **** Implementation of Interval ********************************** | |
| 3992 | |
| 3993 // initialize sentinel | |
| 3994 Interval* Interval::_end = NULL; | |
| 1584 | 3995 void Interval::initialize(Arena* arena) { |
| 3996 Range::initialize(arena); | |
| 3997 _end = new (arena) Interval(-1); | |
| 0 | 3998 } |
| 3999 | |
| 4000 Interval::Interval(int reg_num) : | |
| 4001 _reg_num(reg_num), | |
| 4002 _type(T_ILLEGAL), | |
| 4003 _first(Range::end()), | |
| 4004 _use_pos_and_kinds(12), | |
| 4005 _current(Range::end()), | |
| 4006 _next(_end), | |
| 4007 _state(invalidState), | |
| 4008 _assigned_reg(LinearScan::any_reg), | |
| 4009 _assigned_regHi(LinearScan::any_reg), | |
| 4010 _cached_to(-1), | |
| 4011 _cached_opr(LIR_OprFact::illegalOpr), | |
| 4012 _cached_vm_reg(VMRegImpl::Bad()), | |
| 4013 _split_children(0), | |
| 4014 _canonical_spill_slot(-1), | |
| 4015 _insert_move_when_activated(false), | |
| 4016 _register_hint(NULL), | |
| 4017 _spill_state(noDefinitionFound), | |
| 4018 _spill_definition_pos(-1) | |
| 4019 { | |
| 4020 _split_parent = this; | |
| 4021 _current_split_child = this; | |
| 4022 } | |
| 4023 | |
| 4024 int Interval::calc_to() { | |
| 4025 assert(_first != Range::end(), "interval has no range"); | |
| 4026 | |
| 4027 Range* r = _first; | |
| 4028 while (r->next() != Range::end()) { | |
| 4029 r = r->next(); | |
| 4030 } | |
| 4031 return r->to(); | |
| 4032 } | |
| 4033 | |
| 4034 | |
| 4035 #ifdef ASSERT | |
| 4036 // consistency check of split-children | |
| 4037 void Interval::check_split_children() { | |
| 4038 if (_split_children.length() > 0) { | |
| 4039 assert(is_split_parent(), "only split parents can have children"); | |
| 4040 | |
| 4041 for (int i = 0; i < _split_children.length(); i++) { | |
| 4042 Interval* i1 = _split_children.at(i); | |
| 4043 | |
| 4044 assert(i1->split_parent() == this, "not a split child of this interval"); | |
| 4045 assert(i1->type() == type(), "must be equal for all split children"); | |
| 4046 assert(i1->canonical_spill_slot() == canonical_spill_slot(), "must be equal for all split children"); | |
| 4047 | |
| 4048 for (int j = i + 1; j < _split_children.length(); j++) { | |
| 4049 Interval* i2 = _split_children.at(j); | |
| 4050 | |
| 4051 assert(i1->reg_num() != i2->reg_num(), "same register number"); | |
| 4052 | |
| 4053 if (i1->from() < i2->from()) { | |
| 4054 assert(i1->to() <= i2->from() && i1->to() < i2->to(), "intervals overlapping"); | |
| 4055 } else { | |
| 4056 assert(i2->from() < i1->from(), "intervals start at same op_id"); | |
| 4057 assert(i2->to() <= i1->from() && i2->to() < i1->to(), "intervals overlapping"); | |
| 4058 } | |
| 4059 } | |
| 4060 } | |
| 4061 } | |
| 4062 } | |
| 4063 #endif // ASSERT | |
| 4064 | |
| 4065 Interval* Interval::register_hint(bool search_split_child) const { | |
| 4066 if (!search_split_child) { | |
| 4067 return _register_hint; | |
| 4068 } | |
| 4069 | |
| 4070 if (_register_hint != NULL) { | |
| 4071 assert(_register_hint->is_split_parent(), "ony split parents are valid hint registers"); | |
| 4072 | |
| 4073 if (_register_hint->assigned_reg() >= 0 && _register_hint->assigned_reg() < LinearScan::nof_regs) { | |
| 4074 return _register_hint; | |
| 4075 | |
| 4076 } else if (_register_hint->_split_children.length() > 0) { | |
| 4077 // search the first split child that has a register assigned | |
| 4078 int len = _register_hint->_split_children.length(); | |
| 4079 for (int i = 0; i < len; i++) { | |
| 4080 Interval* cur = _register_hint->_split_children.at(i); | |
| 4081 | |
| 4082 if (cur->assigned_reg() >= 0 && cur->assigned_reg() < LinearScan::nof_regs) { | |
| 4083 return cur; | |
| 4084 } | |
| 4085 } | |
| 4086 } | |
| 4087 } | |
| 4088 | |
| 4089 // no hint interval found that has a register assigned | |
| 4090 return NULL; | |
| 4091 } | |
| 4092 | |
| 4093 | |
| 4094 Interval* Interval::split_child_at_op_id(int op_id, LIR_OpVisitState::OprMode mode) { | |
| 4095 assert(is_split_parent(), "can only be called for split parents"); | |
| 4096 assert(op_id >= 0, "invalid op_id (method can not be called for spill moves)"); | |
| 4097 | |
| 4098 Interval* result; | |
| 4099 if (_split_children.length() == 0) { | |
| 4100 result = this; | |
| 4101 } else { | |
| 4102 result = NULL; | |
| 4103 int len = _split_children.length(); | |
| 4104 | |
| 4105 // in outputMode, the end of the interval (op_id == cur->to()) is not valid | |
| 4106 int to_offset = (mode == LIR_OpVisitState::outputMode ? 0 : 1); | |
| 4107 | |
| 4108 int i; | |
| 4109 for (i = 0; i < len; i++) { | |
| 4110 Interval* cur = _split_children.at(i); | |
| 4111 if (cur->from() <= op_id && op_id < cur->to() + to_offset) { | |
| 4112 if (i > 0) { | |
| 4113 // exchange current split child to start of list (faster access for next call) | |
| 4114 _split_children.at_put(i, _split_children.at(0)); | |
| 4115 _split_children.at_put(0, cur); | |
| 4116 } | |
| 4117 | |
| 4118 // interval found | |
| 4119 result = cur; | |
| 4120 break; | |
| 4121 } | |
| 4122 } | |
| 4123 | |
| 4124 #ifdef ASSERT | |
| 4125 for (i = 0; i < len; i++) { | |
| 4126 Interval* tmp = _split_children.at(i); | |
| 4127 if (tmp != result && tmp->from() <= op_id && op_id < tmp->to() + to_offset) { | |
| 4128 tty->print_cr("two valid result intervals found for op_id %d: %d and %d", op_id, result->reg_num(), tmp->reg_num()); | |
| 4129 result->print(); | |
| 4130 tmp->print(); | |
| 4131 assert(false, "two valid result intervals found"); | |
| 4132 } | |
| 4133 } | |
| 4134 #endif | |
| 4135 } | |
| 4136 | |
| 4137 assert(result != NULL, "no matching interval found"); | |
| 4138 assert(result->covers(op_id, mode), "op_id not covered by interval"); | |
| 4139 | |
| 4140 return result; | |
| 4141 } | |
| 4142 | |
| 4143 | |
| 4144 // returns the last split child that ends before the given op_id | |
| 4145 Interval* Interval::split_child_before_op_id(int op_id) { | |
| 4146 assert(op_id >= 0, "invalid op_id"); | |
| 4147 | |
| 4148 Interval* parent = split_parent(); | |
| 4149 Interval* result = NULL; | |
| 4150 | |
| 4151 int len = parent->_split_children.length(); | |
| 4152 assert(len > 0, "no split children available"); | |
| 4153 | |
| 4154 for (int i = len - 1; i >= 0; i--) { | |
| 4155 Interval* cur = parent->_split_children.at(i); | |
| 4156 if (cur->to() <= op_id && (result == NULL || result->to() < cur->to())) { | |
| 4157 result = cur; | |
| 4158 } | |
| 4159 } | |
| 4160 | |
| 4161 assert(result != NULL, "no split child found"); | |
| 4162 return result; | |
| 4163 } | |
| 4164 | |
| 4165 | |
| 4166 // checks if op_id is covered by any split child | |
| 4167 bool Interval::split_child_covers(int op_id, LIR_OpVisitState::OprMode mode) { | |
| 4168 assert(is_split_parent(), "can only be called for split parents"); | |
| 4169 assert(op_id >= 0, "invalid op_id (method can not be called for spill moves)"); | |
| 4170 | |
| 4171 if (_split_children.length() == 0) { | |
| 4172 // simple case if interval was not split | |
| 4173 return covers(op_id, mode); | |
| 4174 | |
| 4175 } else { | |
| 4176 // extended case: check all split children | |
| 4177 int len = _split_children.length(); | |
| 4178 for (int i = 0; i < len; i++) { | |
| 4179 Interval* cur = _split_children.at(i); | |
| 4180 if (cur->covers(op_id, mode)) { | |
| 4181 return true; | |
| 4182 } | |
| 4183 } | |
| 4184 return false; | |
| 4185 } | |
| 4186 } | |
| 4187 | |
| 4188 | |
| 4189 // Note: use positions are sorted descending -> first use has highest index | |
| 4190 int Interval::first_usage(IntervalUseKind min_use_kind) const { | |
| 4191 assert(LinearScan::is_virtual_interval(this), "cannot access use positions for fixed intervals"); | |
| 4192 | |
| 4193 for (int i = _use_pos_and_kinds.length() - 2; i >= 0; i -= 2) { | |
| 4194 if (_use_pos_and_kinds.at(i + 1) >= min_use_kind) { | |
| 4195 return _use_pos_and_kinds.at(i); | |
| 4196 } | |
| 4197 } | |
| 4198 return max_jint; | |
| 4199 } | |
| 4200 | |
| 4201 int Interval::next_usage(IntervalUseKind min_use_kind, int from) const { | |
| 4202 assert(LinearScan::is_virtual_interval(this), "cannot access use positions for fixed intervals"); | |
| 4203 | |
| 4204 for (int i = _use_pos_and_kinds.length() - 2; i >= 0; i -= 2) { | |
| 4205 if (_use_pos_and_kinds.at(i) >= from && _use_pos_and_kinds.at(i + 1) >= min_use_kind) { | |
| 4206 return _use_pos_and_kinds.at(i); | |
| 4207 } | |
| 4208 } | |
| 4209 return max_jint; | |
| 4210 } | |
| 4211 | |
| 4212 int Interval::next_usage_exact(IntervalUseKind exact_use_kind, int from) const { | |
| 4213 assert(LinearScan::is_virtual_interval(this), "cannot access use positions for fixed intervals"); | |
| 4214 | |
| 4215 for (int i = _use_pos_and_kinds.length() - 2; i >= 0; i -= 2) { | |
| 4216 if (_use_pos_and_kinds.at(i) >= from && _use_pos_and_kinds.at(i + 1) == exact_use_kind) { | |
| 4217 return _use_pos_and_kinds.at(i); | |
| 4218 } | |
| 4219 } | |
| 4220 return max_jint; | |
| 4221 } | |
| 4222 | |
| 4223 int Interval::previous_usage(IntervalUseKind min_use_kind, int from) const { | |
| 4224 assert(LinearScan::is_virtual_interval(this), "cannot access use positions for fixed intervals"); | |
| 4225 | |
| 4226 int prev = 0; | |
| 4227 for (int i = _use_pos_and_kinds.length() - 2; i >= 0; i -= 2) { | |
| 4228 if (_use_pos_and_kinds.at(i) > from) { | |
| 4229 return prev; | |
| 4230 } | |
| 4231 if (_use_pos_and_kinds.at(i + 1) >= min_use_kind) { | |
| 4232 prev = _use_pos_and_kinds.at(i); | |
| 4233 } | |
| 4234 } | |
| 4235 return prev; | |
| 4236 } | |
| 4237 | |
| 4238 void Interval::add_use_pos(int pos, IntervalUseKind use_kind) { | |
| 4239 assert(covers(pos, LIR_OpVisitState::inputMode), "use position not covered by live range"); | |
| 4240 | |
| 4241 // do not add use positions for precolored intervals because | |
| 4242 // they are never used | |
| 4243 if (use_kind != noUse && reg_num() >= LIR_OprDesc::vreg_base) { | |
| 4244 #ifdef ASSERT | |
| 4245 assert(_use_pos_and_kinds.length() % 2 == 0, "must be"); | |
| 4246 for (int i = 0; i < _use_pos_and_kinds.length(); i += 2) { | |
| 4247 assert(pos <= _use_pos_and_kinds.at(i), "already added a use-position with lower position"); | |
| 4248 assert(_use_pos_and_kinds.at(i + 1) >= firstValidKind && _use_pos_and_kinds.at(i + 1) <= lastValidKind, "invalid use kind"); | |
| 4249 if (i > 0) { | |
| 4250 assert(_use_pos_and_kinds.at(i) < _use_pos_and_kinds.at(i - 2), "not sorted descending"); | |
| 4251 } | |
| 4252 } | |
| 4253 #endif | |
| 4254 | |
| 4255 // Note: add_use is called in descending order, so list gets sorted | |
| 4256 // automatically by just appending new use positions | |
| 4257 int len = _use_pos_and_kinds.length(); | |
| 4258 if (len == 0 || _use_pos_and_kinds.at(len - 2) > pos) { | |
| 4259 _use_pos_and_kinds.append(pos); | |
| 4260 _use_pos_and_kinds.append(use_kind); | |
| 4261 } else if (_use_pos_and_kinds.at(len - 1) < use_kind) { | |
| 4262 assert(_use_pos_and_kinds.at(len - 2) == pos, "list not sorted correctly"); | |
| 4263 _use_pos_and_kinds.at_put(len - 1, use_kind); | |
| 4264 } | |
| 4265 } | |
| 4266 } | |
| 4267 | |
| 4268 void Interval::add_range(int from, int to) { | |
| 4269 assert(from < to, "invalid range"); | |
| 4270 assert(first() == Range::end() || to < first()->next()->from(), "not inserting at begin of interval"); | |
| 4271 assert(from <= first()->to(), "not inserting at begin of interval"); | |
| 4272 | |
| 4273 if (first()->from() <= to) { | |
| 4274 // join intersecting ranges | |
| 4275 first()->set_from(MIN2(from, first()->from())); | |
| 4276 first()->set_to (MAX2(to, first()->to())); | |
| 4277 } else { | |
| 4278 // insert new range | |
| 4279 _first = new Range(from, to, first()); | |
| 4280 } | |
| 4281 } | |
| 4282 | |
| 4283 Interval* Interval::new_split_child() { | |
| 4284 // allocate new interval | |
| 4285 Interval* result = new Interval(-1); | |
| 4286 result->set_type(type()); | |
| 4287 | |
| 4288 Interval* parent = split_parent(); | |
| 4289 result->_split_parent = parent; | |
| 4290 result->set_register_hint(parent); | |
| 4291 | |
| 4292 // insert new interval in children-list of parent | |
| 4293 if (parent->_split_children.length() == 0) { | |
| 4294 assert(is_split_parent(), "list must be initialized at first split"); | |
| 4295 | |
| 4296 parent->_split_children = IntervalList(4); | |
| 4297 parent->_split_children.append(this); | |
| 4298 } | |
| 4299 parent->_split_children.append(result); | |
| 4300 | |
| 4301 return result; | |
| 4302 } | |
| 4303 | |
| 4304 // split this interval at the specified position and return | |
| 4305 // the remainder as a new interval. | |
| 4306 // | |
| 4307 // when an interval is split, a bi-directional link is established between the original interval | |
| 4308 // (the split parent) and the intervals that are split off this interval (the split children) | |
| 4309 // When a split child is split again, the new created interval is also a direct child | |
| 4310 // of the original parent (there is no tree of split children stored, but a flat list) | |
| 4311 // All split children are spilled to the same stack slot (stored in _canonical_spill_slot) | |
| 4312 // | |
| 4313 // Note: The new interval has no valid reg_num | |
| 4314 Interval* Interval::split(int split_pos) { | |
| 4315 assert(LinearScan::is_virtual_interval(this), "cannot split fixed intervals"); | |
| 4316 | |
| 4317 // allocate new interval | |
| 4318 Interval* result = new_split_child(); | |
| 4319 | |
| 4320 // split the ranges | |
| 4321 Range* prev = NULL; | |
| 4322 Range* cur = _first; | |
| 4323 while (cur != Range::end() && cur->to() <= split_pos) { | |
| 4324 prev = cur; | |
| 4325 cur = cur->next(); | |
| 4326 } | |
| 4327 assert(cur != Range::end(), "split interval after end of last range"); | |
| 4328 | |
| 4329 if (cur->from() < split_pos) { | |
| 4330 result->_first = new Range(split_pos, cur->to(), cur->next()); | |
| 4331 cur->set_to(split_pos); | |
| 4332 cur->set_next(Range::end()); | |
| 4333 | |
| 4334 } else { | |
| 4335 assert(prev != NULL, "split before start of first range"); | |
| 4336 result->_first = cur; | |
| 4337 prev->set_next(Range::end()); | |
| 4338 } | |
| 4339 result->_current = result->_first; | |
| 4340 _cached_to = -1; // clear cached value | |
| 4341 | |
| 4342 // split list of use positions | |
| 4343 int total_len = _use_pos_and_kinds.length(); | |
| 4344 int start_idx = total_len - 2; | |
| 4345 while (start_idx >= 0 && _use_pos_and_kinds.at(start_idx) < split_pos) { | |
| 4346 start_idx -= 2; | |
| 4347 } | |
| 4348 | |
| 4349 intStack new_use_pos_and_kinds(total_len - start_idx); | |
| 4350 int i; | |
| 4351 for (i = start_idx + 2; i < total_len; i++) { | |
| 4352 new_use_pos_and_kinds.append(_use_pos_and_kinds.at(i)); | |
| 4353 } | |
| 4354 | |
| 4355 _use_pos_and_kinds.truncate(start_idx + 2); | |
| 4356 result->_use_pos_and_kinds = _use_pos_and_kinds; | |
| 4357 _use_pos_and_kinds = new_use_pos_and_kinds; | |
| 4358 | |
| 4359 #ifdef ASSERT | |
| 4360 assert(_use_pos_and_kinds.length() % 2 == 0, "must have use kind for each use pos"); | |
| 4361 assert(result->_use_pos_and_kinds.length() % 2 == 0, "must have use kind for each use pos"); | |
| 4362 assert(_use_pos_and_kinds.length() + result->_use_pos_and_kinds.length() == total_len, "missed some entries"); | |
| 4363 | |
| 4364 for (i = 0; i < _use_pos_and_kinds.length(); i += 2) { | |
| 4365 assert(_use_pos_and_kinds.at(i) < split_pos, "must be"); | |
| 4366 assert(_use_pos_and_kinds.at(i + 1) >= firstValidKind && _use_pos_and_kinds.at(i + 1) <= lastValidKind, "invalid use kind"); | |
| 4367 } | |
| 4368 for (i = 0; i < result->_use_pos_and_kinds.length(); i += 2) { | |
| 4369 assert(result->_use_pos_and_kinds.at(i) >= split_pos, "must be"); | |
| 4370 assert(result->_use_pos_and_kinds.at(i + 1) >= firstValidKind && result->_use_pos_and_kinds.at(i + 1) <= lastValidKind, "invalid use kind"); | |
| 4371 } | |
| 4372 #endif | |
| 4373 | |
| 4374 return result; | |
| 4375 } | |
| 4376 | |
| 4377 // split this interval at the specified position and return | |
| 4378 // the head as a new interval (the original interval is the tail) | |
| 4379 // | |
| 4380 // Currently, only the first range can be split, and the new interval | |
| 4381 // must not have split positions | |
| 4382 Interval* Interval::split_from_start(int split_pos) { | |
| 4383 assert(LinearScan::is_virtual_interval(this), "cannot split fixed intervals"); | |
| 4384 assert(split_pos > from() && split_pos < to(), "can only split inside interval"); | |
| 4385 assert(split_pos > _first->from() && split_pos <= _first->to(), "can only split inside first range"); | |
| 4386 assert(first_usage(noUse) > split_pos, "can not split when use positions are present"); | |
| 4387 | |
| 4388 // allocate new interval | |
| 4389 Interval* result = new_split_child(); | |
| 4390 | |
| 4391 // the new created interval has only one range (checked by assertion above), | |
| 4392 // so the splitting of the ranges is very simple | |
| 4393 result->add_range(_first->from(), split_pos); | |
| 4394 | |
| 4395 if (split_pos == _first->to()) { | |
| 4396 assert(_first->next() != Range::end(), "must not be at end"); | |
| 4397 _first = _first->next(); | |
| 4398 } else { | |
| 4399 _first->set_from(split_pos); | |
| 4400 } | |
| 4401 | |
| 4402 return result; | |
| 4403 } | |
| 4404 | |
| 4405 | |
| 4406 // returns true if the op_id is inside the interval | |
| 4407 bool Interval::covers(int op_id, LIR_OpVisitState::OprMode mode) const { | |
| 4408 Range* cur = _first; | |
| 4409 | |
| 4410 while (cur != Range::end() && cur->to() < op_id) { | |
| 4411 cur = cur->next(); | |
| 4412 } | |
| 4413 if (cur != Range::end()) { | |
| 4414 assert(cur->to() != cur->next()->from(), "ranges not separated"); | |
| 4415 | |
| 4416 if (mode == LIR_OpVisitState::outputMode) { | |
| 4417 return cur->from() <= op_id && op_id < cur->to(); | |
| 4418 } else { | |
| 4419 return cur->from() <= op_id && op_id <= cur->to(); | |
| 4420 } | |
| 4421 } | |
| 4422 return false; | |
| 4423 } | |
| 4424 | |
| 4425 // returns true if the interval has any hole between hole_from and hole_to | |
| 4426 // (even if the hole has only the length 1) | |
| 4427 bool Interval::has_hole_between(int hole_from, int hole_to) { | |
| 4428 assert(hole_from < hole_to, "check"); | |
| 4429 assert(from() <= hole_from && hole_to <= to(), "index out of interval"); | |
| 4430 | |
| 4431 Range* cur = _first; | |
| 4432 while (cur != Range::end()) { | |
| 4433 assert(cur->to() < cur->next()->from(), "no space between ranges"); | |
| 4434 | |
| 4435 // hole-range starts before this range -> hole | |
| 4436 if (hole_from < cur->from()) { | |
| 4437 return true; | |
| 4438 | |
| 4439 // hole-range completely inside this range -> no hole | |
| 4440 } else if (hole_to <= cur->to()) { | |
| 4441 return false; | |
| 4442 | |
| 4443 // overlapping of hole-range with this range -> hole | |
| 4444 } else if (hole_from <= cur->to()) { | |
| 4445 return true; | |
| 4446 } | |
| 4447 | |
| 4448 cur = cur->next(); | |
| 4449 } | |
| 4450 | |
| 4451 return false; | |
| 4452 } | |
| 4453 | |
| 4454 | |
| 4455 #ifndef PRODUCT | |
| 4456 void Interval::print(outputStream* out) const { | |
| 4457 const char* SpillState2Name[] = { "no definition", "no spill store", "one spill store", "store at definition", "start in memory", "no optimization" }; | |
| 4458 const char* UseKind2Name[] = { "N", "L", "S", "M" }; | |
| 4459 | |
| 4460 const char* type_name; | |
| 4461 LIR_Opr opr = LIR_OprFact::illegal(); | |
| 4462 if (reg_num() < LIR_OprDesc::vreg_base) { | |
| 4463 type_name = "fixed"; | |
| 4464 // need a temporary operand for fixed intervals because type() cannot be called | |
| 4465 if (assigned_reg() >= pd_first_cpu_reg && assigned_reg() <= pd_last_cpu_reg) { | |
| 4466 opr = LIR_OprFact::single_cpu(assigned_reg()); | |
| 4467 } else if (assigned_reg() >= pd_first_fpu_reg && assigned_reg() <= pd_last_fpu_reg) { | |
| 4468 opr = LIR_OprFact::single_fpu(assigned_reg() - pd_first_fpu_reg); | |
| 304 | 4469 #ifdef X86 |
| 0 | 4470 } else if (assigned_reg() >= pd_first_xmm_reg && assigned_reg() <= pd_last_xmm_reg) { |
| 4471 opr = LIR_OprFact::single_xmm(assigned_reg() - pd_first_xmm_reg); | |
| 4472 #endif | |
| 4473 } else { | |
| 4474 ShouldNotReachHere(); | |
| 4475 } | |
| 4476 } else { | |
| 4477 type_name = type2name(type()); | |
| 4478 if (assigned_reg() != -1) { | |
| 4479 opr = LinearScan::calc_operand_for_interval(this); | |
| 4480 } | |
| 4481 } | |
| 4482 | |
| 4483 out->print("%d %s ", reg_num(), type_name); | |
| 4484 if (opr->is_valid()) { | |
| 4485 out->print("\""); | |
| 4486 opr->print(out); | |
| 4487 out->print("\" "); | |
| 4488 } | |
| 4489 out->print("%d %d ", split_parent()->reg_num(), (register_hint(false) != NULL ? register_hint(false)->reg_num() : -1)); | |
| 4490 | |
| 4491 // print ranges | |
| 4492 Range* cur = _first; | |
| 4493 while (cur != Range::end()) { | |
| 4494 cur->print(out); | |
| 4495 cur = cur->next(); | |
| 4496 assert(cur != NULL, "range list not closed with range sentinel"); | |
| 4497 } | |
| 4498 | |
| 4499 // print use positions | |
| 4500 int prev = 0; | |
| 4501 assert(_use_pos_and_kinds.length() % 2 == 0, "must be"); | |
| 4502 for (int i =_use_pos_and_kinds.length() - 2; i >= 0; i -= 2) { | |
| 4503 assert(_use_pos_and_kinds.at(i + 1) >= firstValidKind && _use_pos_and_kinds.at(i + 1) <= lastValidKind, "invalid use kind"); | |
| 4504 assert(prev < _use_pos_and_kinds.at(i), "use positions not sorted"); | |
| 4505 | |
| 4506 out->print("%d %s ", _use_pos_and_kinds.at(i), UseKind2Name[_use_pos_and_kinds.at(i + 1)]); | |
| 4507 prev = _use_pos_and_kinds.at(i); | |
| 4508 } | |
| 4509 | |
| 4510 out->print(" \"%s\"", SpillState2Name[spill_state()]); | |
| 4511 out->cr(); | |
| 4512 } | |
| 4513 #endif | |
| 4514 | |
| 4515 | |
| 4516 | |
| 4517 // **** Implementation of IntervalWalker **************************** | |
| 4518 | |
| 4519 IntervalWalker::IntervalWalker(LinearScan* allocator, Interval* unhandled_fixed_first, Interval* unhandled_any_first) | |
| 4520 : _compilation(allocator->compilation()) | |
| 4521 , _allocator(allocator) | |
| 4522 { | |
| 4523 _unhandled_first[fixedKind] = unhandled_fixed_first; | |
| 4524 _unhandled_first[anyKind] = unhandled_any_first; | |
| 4525 _active_first[fixedKind] = Interval::end(); | |
| 4526 _inactive_first[fixedKind] = Interval::end(); | |
| 4527 _active_first[anyKind] = Interval::end(); | |
| 4528 _inactive_first[anyKind] = Interval::end(); | |
| 4529 _current_position = -1; | |
| 4530 _current = NULL; | |
| 4531 next_interval(); | |
| 4532 } | |
| 4533 | |
| 4534 | |
| 4535 // append interval at top of list | |
| 4536 void IntervalWalker::append_unsorted(Interval** list, Interval* interval) { | |
| 4537 interval->set_next(*list); *list = interval; | |
| 4538 } | |
| 4539 | |
| 4540 | |
| 4541 // append interval in order of current range from() | |
| 4542 void IntervalWalker::append_sorted(Interval** list, Interval* interval) { | |
| 4543 Interval* prev = NULL; | |
| 4544 Interval* cur = *list; | |
| 4545 while (cur->current_from() < interval->current_from()) { | |
| 4546 prev = cur; cur = cur->next(); | |
| 4547 } | |
| 4548 if (prev == NULL) { | |
| 4549 *list = interval; | |
| 4550 } else { | |
| 4551 prev->set_next(interval); | |
| 4552 } | |
| 4553 interval->set_next(cur); | |
| 4554 } | |
| 4555 | |
| 4556 void IntervalWalker::append_to_unhandled(Interval** list, Interval* interval) { | |
| 4557 assert(interval->from() >= current()->current_from(), "cannot append new interval before current walk position"); | |
| 4558 | |
| 4559 Interval* prev = NULL; | |
| 4560 Interval* cur = *list; | |
| 4561 while (cur->from() < interval->from() || (cur->from() == interval->from() && cur->first_usage(noUse) < interval->first_usage(noUse))) { | |
| 4562 prev = cur; cur = cur->next(); | |
| 4563 } | |
| 4564 if (prev == NULL) { | |
| 4565 *list = interval; | |
| 4566 } else { | |
| 4567 prev->set_next(interval); | |
| 4568 } | |
| 4569 interval->set_next(cur); | |
| 4570 } | |
| 4571 | |
| 4572 | |
| 4573 inline bool IntervalWalker::remove_from_list(Interval** list, Interval* i) { | |
| 4574 while (*list != Interval::end() && *list != i) { | |
| 4575 list = (*list)->next_addr(); | |
| 4576 } | |
| 4577 if (*list != Interval::end()) { | |
| 4578 assert(*list == i, "check"); | |
| 4579 *list = (*list)->next(); | |
| 4580 return true; | |
| 4581 } else { | |
| 4582 return false; | |
| 4583 } | |
| 4584 } | |
| 4585 | |
| 4586 void IntervalWalker::remove_from_list(Interval* i) { | |
| 4587 bool deleted; | |
| 4588 | |
| 4589 if (i->state() == activeState) { | |
| 4590 deleted = remove_from_list(active_first_addr(anyKind), i); | |
| 4591 } else { | |
| 4592 assert(i->state() == inactiveState, "invalid state"); | |
| 4593 deleted = remove_from_list(inactive_first_addr(anyKind), i); | |
| 4594 } | |
| 4595 | |
| 4596 assert(deleted, "interval has not been found in list"); | |
| 4597 } | |
| 4598 | |
| 4599 | |
| 4600 void IntervalWalker::walk_to(IntervalState state, int from) { | |
| 4601 assert (state == activeState || state == inactiveState, "wrong state"); | |
| 4602 for_each_interval_kind(kind) { | |
| 4603 Interval** prev = state == activeState ? active_first_addr(kind) : inactive_first_addr(kind); | |
| 4604 Interval* next = *prev; | |
| 4605 while (next->current_from() <= from) { | |
| 4606 Interval* cur = next; | |
| 4607 next = cur->next(); | |
| 4608 | |
| 4609 bool range_has_changed = false; | |
| 4610 while (cur->current_to() <= from) { | |
| 4611 cur->next_range(); | |
| 4612 range_has_changed = true; | |
| 4613 } | |
| 4614 | |
| 4615 // also handle move from inactive list to active list | |
| 4616 range_has_changed = range_has_changed || (state == inactiveState && cur->current_from() <= from); | |
| 4617 | |
| 4618 if (range_has_changed) { | |
| 4619 // remove cur from list | |
| 4620 *prev = next; | |
| 4621 if (cur->current_at_end()) { | |
| 4622 // move to handled state (not maintained as a list) | |
| 4623 cur->set_state(handledState); | |
| 4624 interval_moved(cur, kind, state, handledState); | |
| 4625 } else if (cur->current_from() <= from){ | |
| 4626 // sort into active list | |
| 4627 append_sorted(active_first_addr(kind), cur); | |
| 4628 cur->set_state(activeState); | |
| 4629 if (*prev == cur) { | |
| 4630 assert(state == activeState, "check"); | |
| 4631 prev = cur->next_addr(); | |
| 4632 } | |
| 4633 interval_moved(cur, kind, state, activeState); | |
| 4634 } else { | |
| 4635 // sort into inactive list | |
| 4636 append_sorted(inactive_first_addr(kind), cur); | |
| 4637 cur->set_state(inactiveState); | |
| 4638 if (*prev == cur) { | |
| 4639 assert(state == inactiveState, "check"); | |
| 4640 prev = cur->next_addr(); | |
| 4641 } | |
| 4642 interval_moved(cur, kind, state, inactiveState); | |
| 4643 } | |
| 4644 } else { | |
| 4645 prev = cur->next_addr(); | |
| 4646 continue; | |
| 4647 } | |
| 4648 } | |
| 4649 } | |
| 4650 } | |
| 4651 | |
| 4652 | |
| 4653 void IntervalWalker::next_interval() { | |
| 4654 IntervalKind kind; | |
| 4655 Interval* any = _unhandled_first[anyKind]; | |
| 4656 Interval* fixed = _unhandled_first[fixedKind]; | |
| 4657 | |
| 4658 if (any != Interval::end()) { | |
| 4659 // intervals may start at same position -> prefer fixed interval | |
| 4660 kind = fixed != Interval::end() && fixed->from() <= any->from() ? fixedKind : anyKind; | |
| 4661 | |
| 4662 assert (kind == fixedKind && fixed->from() <= any->from() || | |
| 4663 kind == anyKind && any->from() <= fixed->from(), "wrong interval!!!"); | |
| 4664 assert(any == Interval::end() || fixed == Interval::end() || any->from() != fixed->from() || kind == fixedKind, "if fixed and any-Interval start at same position, fixed must be processed first"); | |
| 4665 | |
| 4666 } else if (fixed != Interval::end()) { | |
| 4667 kind = fixedKind; | |
| 4668 } else { | |
| 4669 _current = NULL; return; | |
| 4670 } | |
| 4671 _current_kind = kind; | |
| 4672 _current = _unhandled_first[kind]; | |
| 4673 _unhandled_first[kind] = _current->next(); | |
| 4674 _current->set_next(Interval::end()); | |
| 4675 _current->rewind_range(); | |
| 4676 } | |
| 4677 | |
| 4678 | |
| 4679 void IntervalWalker::walk_to(int lir_op_id) { | |
| 4680 assert(_current_position <= lir_op_id, "can not walk backwards"); | |
| 4681 while (current() != NULL) { | |
| 4682 bool is_active = current()->from() <= lir_op_id; | |
| 4683 int id = is_active ? current()->from() : lir_op_id; | |
| 4684 | |
| 4685 TRACE_LINEAR_SCAN(2, if (_current_position < id) { tty->cr(); tty->print_cr("walk_to(%d) **************************************************************", id); }) | |
| 4686 | |
| 4687 // set _current_position prior to call of walk_to | |
| 4688 _current_position = id; | |
| 4689 | |
| 4690 // call walk_to even if _current_position == id | |
| 4691 walk_to(activeState, id); | |
| 4692 walk_to(inactiveState, id); | |
| 4693 | |
| 4694 if (is_active) { | |
| 4695 current()->set_state(activeState); | |
| 4696 if (activate_current()) { | |
| 4697 append_sorted(active_first_addr(current_kind()), current()); | |
| 4698 interval_moved(current(), current_kind(), unhandledState, activeState); | |
| 4699 } | |
| 4700 | |
| 4701 next_interval(); | |
| 4702 } else { | |
| 4703 return; | |
| 4704 } | |
| 4705 } | |
| 4706 } | |
| 4707 | |
| 4708 void IntervalWalker::interval_moved(Interval* interval, IntervalKind kind, IntervalState from, IntervalState to) { | |
| 4709 #ifndef PRODUCT | |
| 4710 if (TraceLinearScanLevel >= 4) { | |
| 4711 #define print_state(state) \ | |
| 4712 switch(state) {\ | |
| 4713 case unhandledState: tty->print("unhandled"); break;\ | |
| 4714 case activeState: tty->print("active"); break;\ | |
| 4715 case inactiveState: tty->print("inactive"); break;\ | |
| 4716 case handledState: tty->print("handled"); break;\ | |
| 4717 default: ShouldNotReachHere(); \ | |
| 4718 } | |
| 4719 | |
| 4720 print_state(from); tty->print(" to "); print_state(to); | |
| 4721 tty->fill_to(23); | |
| 4722 interval->print(); | |
| 4723 | |
| 4724 #undef print_state | |
| 4725 } | |
| 4726 #endif | |
| 4727 } | |
| 4728 | |
| 4729 | |
| 4730 | |
| 4731 // **** Implementation of LinearScanWalker ************************** | |
| 4732 | |
| 4733 LinearScanWalker::LinearScanWalker(LinearScan* allocator, Interval* unhandled_fixed_first, Interval* unhandled_any_first) | |
| 4734 : IntervalWalker(allocator, unhandled_fixed_first, unhandled_any_first) | |
| 4735 , _move_resolver(allocator) | |
| 4736 { | |
| 4737 for (int i = 0; i < LinearScan::nof_regs; i++) { | |
| 4738 _spill_intervals[i] = new IntervalList(2); | |
| 4739 } | |
| 4740 } | |
| 4741 | |
| 4742 | |
| 4743 inline void LinearScanWalker::init_use_lists(bool only_process_use_pos) { | |
| 4744 for (int i = _first_reg; i <= _last_reg; i++) { | |
| 4745 _use_pos[i] = max_jint; | |
| 4746 | |
| 4747 if (!only_process_use_pos) { | |
| 4748 _block_pos[i] = max_jint; | |
| 4749 _spill_intervals[i]->clear(); | |
| 4750 } | |
| 4751 } | |
| 4752 } | |
| 4753 | |
| 4754 inline void LinearScanWalker::exclude_from_use(int reg) { | |
| 4755 assert(reg < LinearScan::nof_regs, "interval must have a register assigned (stack slots not allowed)"); | |
| 4756 if (reg >= _first_reg && reg <= _last_reg) { | |
| 4757 _use_pos[reg] = 0; | |
| 4758 } | |
| 4759 } | |
| 4760 inline void LinearScanWalker::exclude_from_use(Interval* i) { | |
| 4761 assert(i->assigned_reg() != any_reg, "interval has no register assigned"); | |
| 4762 | |
| 4763 exclude_from_use(i->assigned_reg()); | |
| 4764 exclude_from_use(i->assigned_regHi()); | |
| 4765 } | |
| 4766 | |
| 4767 inline void LinearScanWalker::set_use_pos(int reg, Interval* i, int use_pos, bool only_process_use_pos) { | |
| 4768 assert(use_pos != 0, "must use exclude_from_use to set use_pos to 0"); | |
| 4769 | |
| 4770 if (reg >= _first_reg && reg <= _last_reg) { | |
| 4771 if (_use_pos[reg] > use_pos) { | |
| 4772 _use_pos[reg] = use_pos; | |
| 4773 } | |
| 4774 if (!only_process_use_pos) { | |
| 4775 _spill_intervals[reg]->append(i); | |
| 4776 } | |
| 4777 } | |
| 4778 } | |
| 4779 inline void LinearScanWalker::set_use_pos(Interval* i, int use_pos, bool only_process_use_pos) { | |
| 4780 assert(i->assigned_reg() != any_reg, "interval has no register assigned"); | |
| 4781 if (use_pos != -1) { | |
| 4782 set_use_pos(i->assigned_reg(), i, use_pos, only_process_use_pos); | |
| 4783 set_use_pos(i->assigned_regHi(), i, use_pos, only_process_use_pos); | |
| 4784 } | |
| 4785 } | |
| 4786 | |
| 4787 inline void LinearScanWalker::set_block_pos(int reg, Interval* i, int block_pos) { | |
| 4788 if (reg >= _first_reg && reg <= _last_reg) { | |
| 4789 if (_block_pos[reg] > block_pos) { | |
| 4790 _block_pos[reg] = block_pos; | |
| 4791 } | |
| 4792 if (_use_pos[reg] > block_pos) { | |
| 4793 _use_pos[reg] = block_pos; | |
| 4794 } | |
| 4795 } | |
| 4796 } | |
| 4797 inline void LinearScanWalker::set_block_pos(Interval* i, int block_pos) { | |
| 4798 assert(i->assigned_reg() != any_reg, "interval has no register assigned"); | |
| 4799 if (block_pos != -1) { | |
| 4800 set_block_pos(i->assigned_reg(), i, block_pos); | |
| 4801 set_block_pos(i->assigned_regHi(), i, block_pos); | |
| 4802 } | |
| 4803 } | |
| 4804 | |
| 4805 | |
| 4806 void LinearScanWalker::free_exclude_active_fixed() { | |
| 4807 Interval* list = active_first(fixedKind); | |
| 4808 while (list != Interval::end()) { | |
| 4809 assert(list->assigned_reg() < LinearScan::nof_regs, "active interval must have a register assigned"); | |
| 4810 exclude_from_use(list); | |
| 4811 list = list->next(); | |
| 4812 } | |
| 4813 } | |
| 4814 | |
| 4815 void LinearScanWalker::free_exclude_active_any() { | |
| 4816 Interval* list = active_first(anyKind); | |
| 4817 while (list != Interval::end()) { | |
| 4818 exclude_from_use(list); | |
| 4819 list = list->next(); | |
| 4820 } | |
| 4821 } | |
| 4822 | |
| 4823 void LinearScanWalker::free_collect_inactive_fixed(Interval* cur) { | |
| 4824 Interval* list = inactive_first(fixedKind); | |
| 4825 while (list != Interval::end()) { | |
| 4826 if (cur->to() <= list->current_from()) { | |
| 4827 assert(list->current_intersects_at(cur) == -1, "must not intersect"); | |
| 4828 set_use_pos(list, list->current_from(), true); | |
| 4829 } else { | |
| 4830 set_use_pos(list, list->current_intersects_at(cur), true); | |
| 4831 } | |
| 4832 list = list->next(); | |
| 4833 } | |
| 4834 } | |
| 4835 | |
| 4836 void LinearScanWalker::free_collect_inactive_any(Interval* cur) { | |
| 4837 Interval* list = inactive_first(anyKind); | |
| 4838 while (list != Interval::end()) { | |
| 4839 set_use_pos(list, list->current_intersects_at(cur), true); | |
| 4840 list = list->next(); | |
| 4841 } | |
| 4842 } | |
| 4843 | |
| 4844 void LinearScanWalker::free_collect_unhandled(IntervalKind kind, Interval* cur) { | |
| 4845 Interval* list = unhandled_first(kind); | |
| 4846 while (list != Interval::end()) { | |
| 4847 set_use_pos(list, list->intersects_at(cur), true); | |
| 4848 if (kind == fixedKind && cur->to() <= list->from()) { | |
| 4849 set_use_pos(list, list->from(), true); | |
| 4850 } | |
| 4851 list = list->next(); | |
| 4852 } | |
| 4853 } | |
| 4854 | |
| 4855 void LinearScanWalker::spill_exclude_active_fixed() { | |
| 4856 Interval* list = active_first(fixedKind); | |
| 4857 while (list != Interval::end()) { | |
| 4858 exclude_from_use(list); | |
| 4859 list = list->next(); | |
| 4860 } | |
| 4861 } | |
| 4862 | |
| 4863 void LinearScanWalker::spill_block_unhandled_fixed(Interval* cur) { | |
| 4864 Interval* list = unhandled_first(fixedKind); | |
| 4865 while (list != Interval::end()) { | |
| 4866 set_block_pos(list, list->intersects_at(cur)); | |
| 4867 list = list->next(); | |
| 4868 } | |
| 4869 } | |
| 4870 | |
| 4871 void LinearScanWalker::spill_block_inactive_fixed(Interval* cur) { | |
| 4872 Interval* list = inactive_first(fixedKind); | |
| 4873 while (list != Interval::end()) { | |
| 4874 if (cur->to() > list->current_from()) { | |
| 4875 set_block_pos(list, list->current_intersects_at(cur)); | |
| 4876 } else { | |
| 4877 assert(list->current_intersects_at(cur) == -1, "invalid optimization: intervals intersect"); | |
| 4878 } | |
| 4879 | |
| 4880 list = list->next(); | |
| 4881 } | |
| 4882 } | |
| 4883 | |
| 4884 void LinearScanWalker::spill_collect_active_any() { | |
| 4885 Interval* list = active_first(anyKind); | |
| 4886 while (list != Interval::end()) { | |
| 4887 set_use_pos(list, MIN2(list->next_usage(loopEndMarker, _current_position), list->to()), false); | |
| 4888 list = list->next(); | |
| 4889 } | |
| 4890 } | |
| 4891 | |
| 4892 void LinearScanWalker::spill_collect_inactive_any(Interval* cur) { | |
| 4893 Interval* list = inactive_first(anyKind); | |
| 4894 while (list != Interval::end()) { | |
| 4895 if (list->current_intersects(cur)) { | |
| 4896 set_use_pos(list, MIN2(list->next_usage(loopEndMarker, _current_position), list->to()), false); | |
| 4897 } | |
| 4898 list = list->next(); | |
| 4899 } | |
| 4900 } | |
| 4901 | |
| 4902 | |
| 4903 void LinearScanWalker::insert_move(int op_id, Interval* src_it, Interval* dst_it) { | |
| 4904 // output all moves here. When source and target are equal, the move is | |
| 4905 // optimized away later in assign_reg_nums | |
| 4906 | |
| 4907 op_id = (op_id + 1) & ~1; | |
| 4908 BlockBegin* op_block = allocator()->block_of_op_with_id(op_id); | |
| 4909 assert(op_id > 0 && allocator()->block_of_op_with_id(op_id - 2) == op_block, "cannot insert move at block boundary"); | |
| 4910 | |
| 4911 // calculate index of instruction inside instruction list of current block | |
| 4912 // the minimal index (for a block with no spill moves) can be calculated because the | |
| 4913 // numbering of instructions is known. | |
| 4914 // When the block already contains spill moves, the index must be increased until the | |
| 4915 // correct index is reached. | |
| 4916 LIR_OpList* list = op_block->lir()->instructions_list(); | |
| 4917 int index = (op_id - list->at(0)->id()) / 2; | |
| 4918 assert(list->at(index)->id() <= op_id, "error in calculation"); | |
| 4919 | |
| 4920 while (list->at(index)->id() != op_id) { | |
| 4921 index++; | |
| 4922 assert(0 <= index && index < list->length(), "index out of bounds"); | |
| 4923 } | |
| 4924 assert(1 <= index && index < list->length(), "index out of bounds"); | |
| 4925 assert(list->at(index)->id() == op_id, "error in calculation"); | |
| 4926 | |
| 4927 // insert new instruction before instruction at position index | |
| 4928 _move_resolver.move_insert_position(op_block->lir(), index - 1); | |
| 4929 _move_resolver.add_mapping(src_it, dst_it); | |
| 4930 } | |
| 4931 | |
| 4932 | |
| 4933 int LinearScanWalker::find_optimal_split_pos(BlockBegin* min_block, BlockBegin* max_block, int max_split_pos) { | |
| 4934 int from_block_nr = min_block->linear_scan_number(); | |
| 4935 int to_block_nr = max_block->linear_scan_number(); | |
| 4936 | |
| 4937 assert(0 <= from_block_nr && from_block_nr < block_count(), "out of range"); | |
| 4938 assert(0 <= to_block_nr && to_block_nr < block_count(), "out of range"); | |
| 4939 assert(from_block_nr < to_block_nr, "must cross block boundary"); | |
| 4940 | |
| 4941 // Try to split at end of max_block. If this would be after | |
| 4942 // max_split_pos, then use the begin of max_block | |
| 4943 int optimal_split_pos = max_block->last_lir_instruction_id() + 2; | |
| 4944 if (optimal_split_pos > max_split_pos) { | |
| 4945 optimal_split_pos = max_block->first_lir_instruction_id(); | |
| 4946 } | |
| 4947 | |
| 4948 int min_loop_depth = max_block->loop_depth(); | |
| 4949 for (int i = to_block_nr - 1; i >= from_block_nr; i--) { | |
| 4950 BlockBegin* cur = block_at(i); | |
| 4951 | |
| 4952 if (cur->loop_depth() < min_loop_depth) { | |
| 4953 // block with lower loop-depth found -> split at the end of this block | |
| 4954 min_loop_depth = cur->loop_depth(); | |
| 4955 optimal_split_pos = cur->last_lir_instruction_id() + 2; | |
| 4956 } | |
| 4957 } | |
| 4958 assert(optimal_split_pos > allocator()->max_lir_op_id() || allocator()->is_block_begin(optimal_split_pos), "algorithm must move split pos to block boundary"); | |
| 4959 | |
| 4960 return optimal_split_pos; | |
| 4961 } | |
| 4962 | |
| 4963 | |
| 4964 int LinearScanWalker::find_optimal_split_pos(Interval* it, int min_split_pos, int max_split_pos, bool do_loop_optimization) { | |
| 4965 int optimal_split_pos = -1; | |
| 4966 if (min_split_pos == max_split_pos) { | |
| 4967 // trivial case, no optimization of split position possible | |
| 4968 TRACE_LINEAR_SCAN(4, tty->print_cr(" min-pos and max-pos are equal, no optimization possible")); | |
| 4969 optimal_split_pos = min_split_pos; | |
| 4970 | |
| 4971 } else { | |
| 4972 assert(min_split_pos < max_split_pos, "must be true then"); | |
| 4973 assert(min_split_pos > 0, "cannot access min_split_pos - 1 otherwise"); | |
| 4974 | |
| 4975 // reason for using min_split_pos - 1: when the minimal split pos is exactly at the | |
| 4976 // beginning of a block, then min_split_pos is also a possible split position. | |
| 4977 // Use the block before as min_block, because then min_block->last_lir_instruction_id() + 2 == min_split_pos | |
| 4978 BlockBegin* min_block = allocator()->block_of_op_with_id(min_split_pos - 1); | |
| 4979 | |
| 4980 // reason for using max_split_pos - 1: otherwise there would be an assertion failure | |
| 4981 // when an interval ends at the end of the last block of the method | |
| 4982 // (in this case, max_split_pos == allocator()->max_lir_op_id() + 2, and there is no | |
| 4983 // block at this op_id) | |
| 4984 BlockBegin* max_block = allocator()->block_of_op_with_id(max_split_pos - 1); | |
| 4985 | |
| 4986 assert(min_block->linear_scan_number() <= max_block->linear_scan_number(), "invalid order"); | |
| 4987 if (min_block == max_block) { | |
| 4988 // split position cannot be moved to block boundary, so split as late as possible | |
| 4989 TRACE_LINEAR_SCAN(4, tty->print_cr(" cannot move split pos to block boundary because min_pos and max_pos are in same block")); | |
| 4990 optimal_split_pos = max_split_pos; | |
| 4991 | |
| 4992 } else if (it->has_hole_between(max_split_pos - 1, max_split_pos) && !allocator()->is_block_begin(max_split_pos)) { | |
| 4993 // Do not move split position if the interval has a hole before max_split_pos. | |
| 4994 // Intervals resulting from Phi-Functions have more than one definition (marked | |
| 4995 // as mustHaveRegister) with a hole before each definition. When the register is needed | |
| 4996 // for the second definition, an earlier reloading is unnecessary. | |
| 4997 TRACE_LINEAR_SCAN(4, tty->print_cr(" interval has hole just before max_split_pos, so splitting at max_split_pos")); | |
| 4998 optimal_split_pos = max_split_pos; | |
| 4999 | |
| 5000 } else { | |
| 5001 // seach optimal block boundary between min_split_pos and max_split_pos | |
| 5002 TRACE_LINEAR_SCAN(4, tty->print_cr(" moving split pos to optimal block boundary between block B%d and B%d", min_block->block_id(), max_block->block_id())); | |
| 5003 | |
| 5004 if (do_loop_optimization) { | |
| 5005 // Loop optimization: if a loop-end marker is found between min- and max-position, | |
| 5006 // then split before this loop | |
| 5007 int loop_end_pos = it->next_usage_exact(loopEndMarker, min_block->last_lir_instruction_id() + 2); | |
| 5008 TRACE_LINEAR_SCAN(4, tty->print_cr(" loop optimization: loop end found at pos %d", loop_end_pos)); | |
| 5009 | |
| 5010 assert(loop_end_pos > min_split_pos, "invalid order"); | |
| 5011 if (loop_end_pos < max_split_pos) { | |
| 5012 // loop-end marker found between min- and max-position | |
| 5013 // if it is not the end marker for the same loop as the min-position, then move | |
| 5014 // the max-position to this loop block. | |
| 5015 // Desired result: uses tagged as shouldHaveRegister inside a loop cause a reloading | |
| 5016 // of the interval (normally, only mustHaveRegister causes a reloading) | |
| 5017 BlockBegin* loop_block = allocator()->block_of_op_with_id(loop_end_pos); | |
| 5018 | |
| 5019 TRACE_LINEAR_SCAN(4, tty->print_cr(" interval is used in loop that ends in block B%d, so trying to move max_block back from B%d to B%d", loop_block->block_id(), max_block->block_id(), loop_block->block_id())); | |
| 5020 assert(loop_block != min_block, "loop_block and min_block must be different because block boundary is needed between"); | |
| 5021 | |
| 5022 optimal_split_pos = find_optimal_split_pos(min_block, loop_block, loop_block->last_lir_instruction_id() + 2); | |
| 5023 if (optimal_split_pos == loop_block->last_lir_instruction_id() + 2) { | |
| 5024 optimal_split_pos = -1; | |
| 5025 TRACE_LINEAR_SCAN(4, tty->print_cr(" loop optimization not necessary")); | |
| 5026 } else { | |
| 5027 TRACE_LINEAR_SCAN(4, tty->print_cr(" loop optimization successful")); | |
| 5028 } | |
| 5029 } | |
| 5030 } | |
| 5031 | |
| 5032 if (optimal_split_pos == -1) { | |
| 5033 // not calculated by loop optimization | |
| 5034 optimal_split_pos = find_optimal_split_pos(min_block, max_block, max_split_pos); | |
| 5035 } | |
| 5036 } | |
| 5037 } | |
| 5038 TRACE_LINEAR_SCAN(4, tty->print_cr(" optimal split position: %d", optimal_split_pos)); | |
| 5039 | |
| 5040 return optimal_split_pos; | |
| 5041 } | |
| 5042 | |
| 5043 | |
| 5044 /* | |
| 5045 split an interval at the optimal position between min_split_pos and | |
| 5046 max_split_pos in two parts: | |
| 5047 1) the left part has already a location assigned | |
| 5048 2) the right part is sorted into to the unhandled-list | |
| 5049 */ | |
| 5050 void LinearScanWalker::split_before_usage(Interval* it, int min_split_pos, int max_split_pos) { | |
| 5051 TRACE_LINEAR_SCAN(2, tty->print ("----- splitting interval: "); it->print()); | |
| 5052 TRACE_LINEAR_SCAN(2, tty->print_cr(" between %d and %d", min_split_pos, max_split_pos)); | |
| 5053 | |
| 5054 assert(it->from() < min_split_pos, "cannot split at start of interval"); | |
| 5055 assert(current_position() < min_split_pos, "cannot split before current position"); | |
| 5056 assert(min_split_pos <= max_split_pos, "invalid order"); | |
| 5057 assert(max_split_pos <= it->to(), "cannot split after end of interval"); | |
| 5058 | |
| 5059 int optimal_split_pos = find_optimal_split_pos(it, min_split_pos, max_split_pos, true); | |
| 5060 | |
| 5061 assert(min_split_pos <= optimal_split_pos && optimal_split_pos <= max_split_pos, "out of range"); | |
| 5062 assert(optimal_split_pos <= it->to(), "cannot split after end of interval"); | |
| 5063 assert(optimal_split_pos > it->from(), "cannot split at start of interval"); | |
| 5064 | |
| 5065 if (optimal_split_pos == it->to() && it->next_usage(mustHaveRegister, min_split_pos) == max_jint) { | |
| 5066 // the split position would be just before the end of the interval | |
| 5067 // -> no split at all necessary | |
| 5068 TRACE_LINEAR_SCAN(4, tty->print_cr(" no split necessary because optimal split position is at end of interval")); | |
| 5069 return; | |
| 5070 } | |
| 5071 | |
| 5072 // must calculate this before the actual split is performed and before split position is moved to odd op_id | |
| 5073 bool move_necessary = !allocator()->is_block_begin(optimal_split_pos) && !it->has_hole_between(optimal_split_pos - 1, optimal_split_pos); | |
| 5074 | |
| 5075 if (!allocator()->is_block_begin(optimal_split_pos)) { | |
| 5076 // move position before actual instruction (odd op_id) | |
| 5077 optimal_split_pos = (optimal_split_pos - 1) | 1; | |
| 5078 } | |
| 5079 | |
| 5080 TRACE_LINEAR_SCAN(4, tty->print_cr(" splitting at position %d", optimal_split_pos)); | |
| 5081 assert(allocator()->is_block_begin(optimal_split_pos) || (optimal_split_pos % 2 == 1), "split pos must be odd when not on block boundary"); | |
| 5082 assert(!allocator()->is_block_begin(optimal_split_pos) || (optimal_split_pos % 2 == 0), "split pos must be even on block boundary"); | |
| 5083 | |
| 5084 Interval* split_part = it->split(optimal_split_pos); | |
| 5085 | |
| 5086 allocator()->append_interval(split_part); | |
| 5087 allocator()->copy_register_flags(it, split_part); | |
| 5088 split_part->set_insert_move_when_activated(move_necessary); | |
| 5089 append_to_unhandled(unhandled_first_addr(anyKind), split_part); | |
| 5090 | |
| 5091 TRACE_LINEAR_SCAN(2, tty->print_cr(" split interval in two parts (insert_move_when_activated: %d)", move_necessary)); | |
| 5092 TRACE_LINEAR_SCAN(2, tty->print (" "); it->print()); | |
| 5093 TRACE_LINEAR_SCAN(2, tty->print (" "); split_part->print()); | |
| 5094 } | |
| 5095 | |
| 5096 /* | |
| 5097 split an interval at the optimal position between min_split_pos and | |
| 5098 max_split_pos in two parts: | |
| 5099 1) the left part has already a location assigned | |
| 5100 2) the right part is always on the stack and therefore ignored in further processing | |
| 5101 */ | |
| 5102 void LinearScanWalker::split_for_spilling(Interval* it) { | |
| 5103 // calculate allowed range of splitting position | |
| 5104 int max_split_pos = current_position(); | |
| 5105 int min_split_pos = MAX2(it->previous_usage(shouldHaveRegister, max_split_pos) + 1, it->from()); | |
| 5106 | |
| 5107 TRACE_LINEAR_SCAN(2, tty->print ("----- splitting and spilling interval: "); it->print()); | |
| 5108 TRACE_LINEAR_SCAN(2, tty->print_cr(" between %d and %d", min_split_pos, max_split_pos)); | |
| 5109 | |
| 5110 assert(it->state() == activeState, "why spill interval that is not active?"); | |
| 5111 assert(it->from() <= min_split_pos, "cannot split before start of interval"); | |
| 5112 assert(min_split_pos <= max_split_pos, "invalid order"); | |
| 5113 assert(max_split_pos < it->to(), "cannot split at end end of interval"); | |
| 5114 assert(current_position() < it->to(), "interval must not end before current position"); | |
| 5115 | |
| 5116 if (min_split_pos == it->from()) { | |
| 5117 // the whole interval is never used, so spill it entirely to memory | |
| 5118 TRACE_LINEAR_SCAN(2, tty->print_cr(" spilling entire interval because split pos is at beginning of interval")); | |
| 5119 assert(it->first_usage(shouldHaveRegister) > current_position(), "interval must not have use position before current_position"); | |
| 5120 | |
| 5121 allocator()->assign_spill_slot(it); | |
| 5122 allocator()->change_spill_state(it, min_split_pos); | |
| 5123 | |
| 5124 // Also kick parent intervals out of register to memory when they have no use | |
| 5125 // position. This avoids short interval in register surrounded by intervals in | |
| 5126 // memory -> avoid useless moves from memory to register and back | |
| 5127 Interval* parent = it; | |
| 5128 while (parent != NULL && parent->is_split_child()) { | |
| 5129 parent = parent->split_child_before_op_id(parent->from()); | |
| 5130 | |
| 5131 if (parent->assigned_reg() < LinearScan::nof_regs) { | |
| 5132 if (parent->first_usage(shouldHaveRegister) == max_jint) { | |
| 5133 // parent is never used, so kick it out of its assigned register | |
| 5134 TRACE_LINEAR_SCAN(4, tty->print_cr(" kicking out interval %d out of its register because it is never used", parent->reg_num())); | |
| 5135 allocator()->assign_spill_slot(parent); | |
| 5136 } else { | |
| 5137 // do not go further back because the register is actually used by the interval | |
| 5138 parent = NULL; | |
| 5139 } | |
| 5140 } | |
| 5141 } | |
| 5142 | |
| 5143 } else { | |
| 5144 // search optimal split pos, split interval and spill only the right hand part | |
| 5145 int optimal_split_pos = find_optimal_split_pos(it, min_split_pos, max_split_pos, false); | |
| 5146 | |
| 5147 assert(min_split_pos <= optimal_split_pos && optimal_split_pos <= max_split_pos, "out of range"); | |
| 5148 assert(optimal_split_pos < it->to(), "cannot split at end of interval"); | |
| 5149 assert(optimal_split_pos >= it->from(), "cannot split before start of interval"); | |
| 5150 | |
| 5151 if (!allocator()->is_block_begin(optimal_split_pos)) { | |
| 5152 // move position before actual instruction (odd op_id) | |
| 5153 optimal_split_pos = (optimal_split_pos - 1) | 1; | |
| 5154 } | |
| 5155 | |
| 5156 TRACE_LINEAR_SCAN(4, tty->print_cr(" splitting at position %d", optimal_split_pos)); | |
| 5157 assert(allocator()->is_block_begin(optimal_split_pos) || (optimal_split_pos % 2 == 1), "split pos must be odd when not on block boundary"); | |
| 5158 assert(!allocator()->is_block_begin(optimal_split_pos) || (optimal_split_pos % 2 == 0), "split pos must be even on block boundary"); | |
| 5159 | |
| 5160 Interval* spilled_part = it->split(optimal_split_pos); | |
| 5161 allocator()->append_interval(spilled_part); | |
| 5162 allocator()->assign_spill_slot(spilled_part); | |
| 5163 allocator()->change_spill_state(spilled_part, optimal_split_pos); | |
| 5164 | |
| 5165 if (!allocator()->is_block_begin(optimal_split_pos)) { | |
| 5166 TRACE_LINEAR_SCAN(4, tty->print_cr(" inserting move from interval %d to %d", it->reg_num(), spilled_part->reg_num())); | |
| 5167 insert_move(optimal_split_pos, it, spilled_part); | |
| 5168 } | |
| 5169 | |
| 5170 // the current_split_child is needed later when moves are inserted for reloading | |
| 5171 assert(spilled_part->current_split_child() == it, "overwriting wrong current_split_child"); | |
| 5172 spilled_part->make_current_split_child(); | |
| 5173 | |
| 5174 TRACE_LINEAR_SCAN(2, tty->print_cr(" split interval in two parts")); | |
| 5175 TRACE_LINEAR_SCAN(2, tty->print (" "); it->print()); | |
| 5176 TRACE_LINEAR_SCAN(2, tty->print (" "); spilled_part->print()); | |
| 5177 } | |
| 5178 } | |
| 5179 | |
| 5180 | |
| 5181 void LinearScanWalker::split_stack_interval(Interval* it) { | |
| 5182 int min_split_pos = current_position() + 1; | |
| 5183 int max_split_pos = MIN2(it->first_usage(shouldHaveRegister), it->to()); | |
| 5184 | |
| 5185 split_before_usage(it, min_split_pos, max_split_pos); | |
| 5186 } | |
| 5187 | |
| 5188 void LinearScanWalker::split_when_partial_register_available(Interval* it, int register_available_until) { | |
| 5189 int min_split_pos = MAX2(it->previous_usage(shouldHaveRegister, register_available_until), it->from() + 1); | |
| 5190 int max_split_pos = register_available_until; | |
| 5191 | |
| 5192 split_before_usage(it, min_split_pos, max_split_pos); | |
| 5193 } | |
| 5194 | |
| 5195 void LinearScanWalker::split_and_spill_interval(Interval* it) { | |
| 5196 assert(it->state() == activeState || it->state() == inactiveState, "other states not allowed"); | |
| 5197 | |
| 5198 int current_pos = current_position(); | |
| 5199 if (it->state() == inactiveState) { | |
| 5200 // the interval is currently inactive, so no spill slot is needed for now. | |
| 5201 // when the split part is activated, the interval has a new chance to get a register, | |
| 5202 // so in the best case no stack slot is necessary | |
| 5203 assert(it->has_hole_between(current_pos - 1, current_pos + 1), "interval can not be inactive otherwise"); | |
| 5204 split_before_usage(it, current_pos + 1, current_pos + 1); | |
| 5205 | |
| 5206 } else { | |
| 5207 // search the position where the interval must have a register and split | |
| 5208 // at the optimal position before. | |
| 5209 // The new created part is added to the unhandled list and will get a register | |
| 5210 // when it is activated | |
| 5211 int min_split_pos = current_pos + 1; | |
| 5212 int max_split_pos = MIN2(it->next_usage(mustHaveRegister, min_split_pos), it->to()); | |
| 5213 | |
| 5214 split_before_usage(it, min_split_pos, max_split_pos); | |
| 5215 | |
| 5216 assert(it->next_usage(mustHaveRegister, current_pos) == max_jint, "the remaining part is spilled to stack and therefore has no register"); | |
| 5217 split_for_spilling(it); | |
| 5218 } | |
| 5219 } | |
| 5220 | |
| 5221 | |
| 5222 int LinearScanWalker::find_free_reg(int reg_needed_until, int interval_to, int hint_reg, int ignore_reg, bool* need_split) { | |
| 5223 int min_full_reg = any_reg; | |
| 5224 int max_partial_reg = any_reg; | |
| 5225 | |
| 5226 for (int i = _first_reg; i <= _last_reg; i++) { | |
| 5227 if (i == ignore_reg) { | |
| 5228 // this register must be ignored | |
| 5229 | |
| 5230 } else if (_use_pos[i] >= interval_to) { | |
| 5231 // this register is free for the full interval | |
| 5232 if (min_full_reg == any_reg || i == hint_reg || (_use_pos[i] < _use_pos[min_full_reg] && min_full_reg != hint_reg)) { | |
| 5233 min_full_reg = i; | |
| 5234 } | |
| 5235 } else if (_use_pos[i] > reg_needed_until) { | |
| 5236 // this register is at least free until reg_needed_until | |
| 5237 if (max_partial_reg == any_reg || i == hint_reg || (_use_pos[i] > _use_pos[max_partial_reg] && max_partial_reg != hint_reg)) { | |
| 5238 max_partial_reg = i; | |
| 5239 } | |
| 5240 } | |
| 5241 } | |
| 5242 | |
| 5243 if (min_full_reg != any_reg) { | |
| 5244 return min_full_reg; | |
| 5245 } else if (max_partial_reg != any_reg) { | |
| 5246 *need_split = true; | |
| 5247 return max_partial_reg; | |
| 5248 } else { | |
| 5249 return any_reg; | |
| 5250 } | |
| 5251 } | |
| 5252 | |
| 5253 int LinearScanWalker::find_free_double_reg(int reg_needed_until, int interval_to, int hint_reg, bool* need_split) { | |
| 5254 assert((_last_reg - _first_reg + 1) % 2 == 0, "adjust algorithm"); | |
| 5255 | |
| 5256 int min_full_reg = any_reg; | |
| 5257 int max_partial_reg = any_reg; | |
| 5258 | |
| 5259 for (int i = _first_reg; i < _last_reg; i+=2) { | |
| 5260 if (_use_pos[i] >= interval_to && _use_pos[i + 1] >= interval_to) { | |
| 5261 // this register is free for the full interval | |
| 5262 if (min_full_reg == any_reg || i == hint_reg || (_use_pos[i] < _use_pos[min_full_reg] && min_full_reg != hint_reg)) { | |
| 5263 min_full_reg = i; | |
| 5264 } | |
| 5265 } else if (_use_pos[i] > reg_needed_until && _use_pos[i + 1] > reg_needed_until) { | |
| 5266 // this register is at least free until reg_needed_until | |
| 5267 if (max_partial_reg == any_reg || i == hint_reg || (_use_pos[i] > _use_pos[max_partial_reg] && max_partial_reg != hint_reg)) { | |
| 5268 max_partial_reg = i; | |
| 5269 } | |
| 5270 } | |
| 5271 } | |
| 5272 | |
| 5273 if (min_full_reg != any_reg) { | |
| 5274 return min_full_reg; | |
| 5275 } else if (max_partial_reg != any_reg) { | |
| 5276 *need_split = true; | |
| 5277 return max_partial_reg; | |
| 5278 } else { | |
| 5279 return any_reg; | |
| 5280 } | |
| 5281 } | |
| 5282 | |
| 5283 | |
| 5284 bool LinearScanWalker::alloc_free_reg(Interval* cur) { | |
| 5285 TRACE_LINEAR_SCAN(2, tty->print("trying to find free register for "); cur->print()); | |
| 5286 | |
| 5287 init_use_lists(true); | |
| 5288 free_exclude_active_fixed(); | |
| 5289 free_exclude_active_any(); | |
| 5290 free_collect_inactive_fixed(cur); | |
| 5291 free_collect_inactive_any(cur); | |
| 5292 // free_collect_unhandled(fixedKind, cur); | |
| 5293 assert(unhandled_first(fixedKind) == Interval::end(), "must not have unhandled fixed intervals because all fixed intervals have a use at position 0"); | |
| 5294 | |
| 5295 // _use_pos contains the start of the next interval that has this register assigned | |
| 5296 // (either as a fixed register or a normal allocated register in the past) | |
| 5297 // only intervals overlapping with cur are processed, non-overlapping invervals can be ignored safely | |
| 5298 TRACE_LINEAR_SCAN(4, tty->print_cr(" state of registers:")); | |
| 5299 TRACE_LINEAR_SCAN(4, for (int i = _first_reg; i <= _last_reg; i++) tty->print_cr(" reg %d: use_pos: %d", i, _use_pos[i])); | |
| 5300 | |
| 5301 int hint_reg, hint_regHi; | |
| 5302 Interval* register_hint = cur->register_hint(); | |
| 5303 if (register_hint != NULL) { | |
| 5304 hint_reg = register_hint->assigned_reg(); | |
| 5305 hint_regHi = register_hint->assigned_regHi(); | |
| 5306 | |
| 5307 if (allocator()->is_precolored_cpu_interval(register_hint)) { | |
| 5308 assert(hint_reg != any_reg && hint_regHi == any_reg, "must be for fixed intervals"); | |
| 5309 hint_regHi = hint_reg + 1; // connect e.g. eax-edx | |
| 5310 } | |
| 5311 TRACE_LINEAR_SCAN(4, tty->print(" hint registers %d, %d from interval ", hint_reg, hint_regHi); register_hint->print()); | |
| 5312 | |
| 5313 } else { | |
| 5314 hint_reg = any_reg; | |
| 5315 hint_regHi = any_reg; | |
| 5316 } | |
| 5317 assert(hint_reg == any_reg || hint_reg != hint_regHi, "hint reg and regHi equal"); | |
| 5318 assert(cur->assigned_reg() == any_reg && cur->assigned_regHi() == any_reg, "register already assigned to interval"); | |
| 5319 | |
| 5320 // the register must be free at least until this position | |
| 5321 int reg_needed_until = cur->from() + 1; | |
| 5322 int interval_to = cur->to(); | |
| 5323 | |
| 5324 bool need_split = false; | |
| 5325 int split_pos = -1; | |
| 5326 int reg = any_reg; | |
| 5327 int regHi = any_reg; | |
| 5328 | |
| 5329 if (_adjacent_regs) { | |
| 5330 reg = find_free_double_reg(reg_needed_until, interval_to, hint_reg, &need_split); | |
| 5331 regHi = reg + 1; | |
| 5332 if (reg == any_reg) { | |
| 5333 return false; | |
| 5334 } | |
| 5335 split_pos = MIN2(_use_pos[reg], _use_pos[regHi]); | |
| 5336 | |
| 5337 } else { | |
| 5338 reg = find_free_reg(reg_needed_until, interval_to, hint_reg, any_reg, &need_split); | |
| 5339 if (reg == any_reg) { | |
| 5340 return false; | |
| 5341 } | |
| 5342 split_pos = _use_pos[reg]; | |
| 5343 | |
| 5344 if (_num_phys_regs == 2) { | |
| 5345 regHi = find_free_reg(reg_needed_until, interval_to, hint_regHi, reg, &need_split); | |
| 5346 | |
| 5347 if (_use_pos[reg] < interval_to && regHi == any_reg) { | |
| 5348 // do not split interval if only one register can be assigned until the split pos | |
| 5349 // (when one register is found for the whole interval, split&spill is only | |
| 5350 // performed for the hi register) | |
| 5351 return false; | |
| 5352 | |
| 5353 } else if (regHi != any_reg) { | |
| 5354 split_pos = MIN2(split_pos, _use_pos[regHi]); | |
| 5355 | |
| 5356 // sort register numbers to prevent e.g. a move from eax,ebx to ebx,eax | |
| 5357 if (reg > regHi) { | |
| 5358 int temp = reg; | |
| 5359 reg = regHi; | |
| 5360 regHi = temp; | |
| 5361 } | |
| 5362 } | |
| 5363 } | |
| 5364 } | |
| 5365 | |
| 5366 cur->assign_reg(reg, regHi); | |
| 5367 TRACE_LINEAR_SCAN(2, tty->print_cr("selected register %d, %d", reg, regHi)); | |
| 5368 | |
| 5369 assert(split_pos > 0, "invalid split_pos"); | |
| 5370 if (need_split) { | |
| 5371 // register not available for full interval, so split it | |
| 5372 split_when_partial_register_available(cur, split_pos); | |
| 5373 } | |
| 5374 | |
| 5375 // only return true if interval is completely assigned | |
| 5376 return _num_phys_regs == 1 || regHi != any_reg; | |
| 5377 } | |
| 5378 | |
| 5379 | |
| 5380 int LinearScanWalker::find_locked_reg(int reg_needed_until, int interval_to, int hint_reg, int ignore_reg, bool* need_split) { | |
| 5381 int max_reg = any_reg; | |
| 5382 | |
| 5383 for (int i = _first_reg; i <= _last_reg; i++) { | |
| 5384 if (i == ignore_reg) { | |
| 5385 // this register must be ignored | |
| 5386 | |
| 5387 } else if (_use_pos[i] > reg_needed_until) { | |
| 5388 if (max_reg == any_reg || i == hint_reg || (_use_pos[i] > _use_pos[max_reg] && max_reg != hint_reg)) { | |
| 5389 max_reg = i; | |
| 5390 } | |
| 5391 } | |
| 5392 } | |
| 5393 | |
| 5394 if (max_reg != any_reg && _block_pos[max_reg] <= interval_to) { | |
| 5395 *need_split = true; | |
| 5396 } | |
| 5397 | |
| 5398 return max_reg; | |
| 5399 } | |
| 5400 | |
| 5401 int LinearScanWalker::find_locked_double_reg(int reg_needed_until, int interval_to, int hint_reg, bool* need_split) { | |
| 5402 assert((_last_reg - _first_reg + 1) % 2 == 0, "adjust algorithm"); | |
| 5403 | |
| 5404 int max_reg = any_reg; | |
| 5405 | |
| 5406 for (int i = _first_reg; i < _last_reg; i+=2) { | |
| 5407 if (_use_pos[i] > reg_needed_until && _use_pos[i + 1] > reg_needed_until) { | |
| 5408 if (max_reg == any_reg || _use_pos[i] > _use_pos[max_reg]) { | |
| 5409 max_reg = i; | |
| 5410 } | |
| 5411 } | |
| 5412 } | |
| 5413 | |
| 5414 if (_block_pos[max_reg] <= interval_to || _block_pos[max_reg + 1] <= interval_to) { | |
| 5415 *need_split = true; | |
| 5416 } | |
| 5417 | |
| 5418 return max_reg; | |
| 5419 } | |
| 5420 | |
| 5421 void LinearScanWalker::split_and_spill_intersecting_intervals(int reg, int regHi) { | |
| 5422 assert(reg != any_reg, "no register assigned"); | |
| 5423 | |
| 5424 for (int i = 0; i < _spill_intervals[reg]->length(); i++) { | |
| 5425 Interval* it = _spill_intervals[reg]->at(i); | |
| 5426 remove_from_list(it); | |
| 5427 split_and_spill_interval(it); | |
| 5428 } | |
| 5429 | |
| 5430 if (regHi != any_reg) { | |
| 5431 IntervalList* processed = _spill_intervals[reg]; | |
| 5432 for (int i = 0; i < _spill_intervals[regHi]->length(); i++) { | |
| 5433 Interval* it = _spill_intervals[regHi]->at(i); | |
| 5434 if (processed->index_of(it) == -1) { | |
| 5435 remove_from_list(it); | |
| 5436 split_and_spill_interval(it); | |
| 5437 } | |
| 5438 } | |
| 5439 } | |
| 5440 } | |
| 5441 | |
| 5442 | |
| 5443 // Split an Interval and spill it to memory so that cur can be placed in a register | |
| 5444 void LinearScanWalker::alloc_locked_reg(Interval* cur) { | |
| 5445 TRACE_LINEAR_SCAN(2, tty->print("need to split and spill to get register for "); cur->print()); | |
| 5446 | |
| 5447 // collect current usage of registers | |
| 5448 init_use_lists(false); | |
| 5449 spill_exclude_active_fixed(); | |
| 5450 // spill_block_unhandled_fixed(cur); | |
| 5451 assert(unhandled_first(fixedKind) == Interval::end(), "must not have unhandled fixed intervals because all fixed intervals have a use at position 0"); | |
| 5452 spill_block_inactive_fixed(cur); | |
| 5453 spill_collect_active_any(); | |
| 5454 spill_collect_inactive_any(cur); | |
| 5455 | |
| 5456 #ifndef PRODUCT | |
| 5457 if (TraceLinearScanLevel >= 4) { | |
| 5458 tty->print_cr(" state of registers:"); | |
| 5459 for (int i = _first_reg; i <= _last_reg; i++) { | |
| 5460 tty->print(" reg %d: use_pos: %d, block_pos: %d, intervals: ", i, _use_pos[i], _block_pos[i]); | |
| 5461 for (int j = 0; j < _spill_intervals[i]->length(); j++) { | |
| 5462 tty->print("%d ", _spill_intervals[i]->at(j)->reg_num()); | |
| 5463 } | |
| 5464 tty->cr(); | |
| 5465 } | |
| 5466 } | |
| 5467 #endif | |
| 5468 | |
| 5469 // the register must be free at least until this position | |
| 5470 int reg_needed_until = MIN2(cur->first_usage(mustHaveRegister), cur->from() + 1); | |
| 5471 int interval_to = cur->to(); | |
| 5472 assert (reg_needed_until > 0 && reg_needed_until < max_jint, "interval has no use"); | |
| 5473 | |
| 5474 int split_pos = 0; | |
| 5475 int use_pos = 0; | |
| 5476 bool need_split = false; | |
| 5477 int reg, regHi; | |
| 5478 | |
| 5479 if (_adjacent_regs) { | |
| 5480 reg = find_locked_double_reg(reg_needed_until, interval_to, any_reg, &need_split); | |
| 5481 regHi = reg + 1; | |
| 5482 | |
| 5483 if (reg != any_reg) { | |
| 5484 use_pos = MIN2(_use_pos[reg], _use_pos[regHi]); | |
| 5485 split_pos = MIN2(_block_pos[reg], _block_pos[regHi]); | |
| 5486 } | |
| 5487 } else { | |
| 5488 reg = find_locked_reg(reg_needed_until, interval_to, any_reg, cur->assigned_reg(), &need_split); | |
| 5489 regHi = any_reg; | |
| 5490 | |
| 5491 if (reg != any_reg) { | |
| 5492 use_pos = _use_pos[reg]; | |
| 5493 split_pos = _block_pos[reg]; | |
| 5494 | |
| 5495 if (_num_phys_regs == 2) { | |
| 5496 if (cur->assigned_reg() != any_reg) { | |
| 5497 regHi = reg; | |
| 5498 reg = cur->assigned_reg(); | |
| 5499 } else { | |
| 5500 regHi = find_locked_reg(reg_needed_until, interval_to, any_reg, reg, &need_split); | |
| 5501 if (regHi != any_reg) { | |
| 5502 use_pos = MIN2(use_pos, _use_pos[regHi]); | |
| 5503 split_pos = MIN2(split_pos, _block_pos[regHi]); | |
| 5504 } | |
| 5505 } | |
| 5506 | |
| 5507 if (regHi != any_reg && reg > regHi) { | |
| 5508 // sort register numbers to prevent e.g. a move from eax,ebx to ebx,eax | |
| 5509 int temp = reg; | |
| 5510 reg = regHi; | |
| 5511 regHi = temp; | |
| 5512 } | |
| 5513 } | |
| 5514 } | |
| 5515 } | |
| 5516 | |
| 5517 if (reg == any_reg || (_num_phys_regs == 2 && regHi == any_reg) || use_pos <= cur->first_usage(mustHaveRegister)) { | |
| 5518 // the first use of cur is later than the spilling position -> spill cur | |
| 5519 TRACE_LINEAR_SCAN(4, tty->print_cr("able to spill current interval. first_usage(register): %d, use_pos: %d", cur->first_usage(mustHaveRegister), use_pos)); | |
| 5520 | |
| 5521 if (cur->first_usage(mustHaveRegister) <= cur->from() + 1) { | |
| 5522 assert(false, "cannot spill interval that is used in first instruction (possible reason: no register found)"); | |
| 5523 // assign a reasonable register and do a bailout in product mode to avoid errors | |
| 5524 allocator()->assign_spill_slot(cur); | |
| 5525 BAILOUT("LinearScan: no register found"); | |
| 5526 } | |
| 5527 | |
| 5528 split_and_spill_interval(cur); | |
| 5529 } else { | |
| 5530 TRACE_LINEAR_SCAN(4, tty->print_cr("decided to use register %d, %d", reg, regHi)); | |
| 5531 assert(reg != any_reg && (_num_phys_regs == 1 || regHi != any_reg), "no register found"); | |
| 5532 assert(split_pos > 0, "invalid split_pos"); | |
| 5533 assert(need_split == false || split_pos > cur->from(), "splitting interval at from"); | |
| 5534 | |
| 5535 cur->assign_reg(reg, regHi); | |
| 5536 if (need_split) { | |
| 5537 // register not available for full interval, so split it | |
| 5538 split_when_partial_register_available(cur, split_pos); | |
| 5539 } | |
| 5540 | |
| 5541 // perform splitting and spilling for all affected intervalls | |
| 5542 split_and_spill_intersecting_intervals(reg, regHi); | |
| 5543 } | |
| 5544 } | |
| 5545 | |
| 5546 bool LinearScanWalker::no_allocation_possible(Interval* cur) { | |
| 304 | 5547 #ifdef X86 |
| 0 | 5548 // fast calculation of intervals that can never get a register because the |
| 5549 // the next instruction is a call that blocks all registers | |
| 5550 // Note: this does not work if callee-saved registers are available (e.g. on Sparc) | |
| 5551 | |
| 5552 // check if this interval is the result of a split operation | |
| 5553 // (an interval got a register until this position) | |
| 5554 int pos = cur->from(); | |
| 5555 if ((pos & 1) == 1) { | |
| 5556 // the current instruction is a call that blocks all registers | |
| 5557 if (pos < allocator()->max_lir_op_id() && allocator()->has_call(pos + 1)) { | |
| 5558 TRACE_LINEAR_SCAN(4, tty->print_cr(" free register cannot be available because all registers blocked by following call")); | |
| 5559 | |
| 5560 // safety check that there is really no register available | |
| 5561 assert(alloc_free_reg(cur) == false, "found a register for this interval"); | |
| 5562 return true; | |
| 5563 } | |
| 5564 | |
| 5565 } | |
| 5566 #endif | |
| 5567 return false; | |
| 5568 } | |
| 5569 | |
| 5570 void LinearScanWalker::init_vars_for_alloc(Interval* cur) { | |
| 5571 BasicType type = cur->type(); | |
| 5572 _num_phys_regs = LinearScan::num_physical_regs(type); | |
| 5573 _adjacent_regs = LinearScan::requires_adjacent_regs(type); | |
| 5574 | |
| 5575 if (pd_init_regs_for_alloc(cur)) { | |
| 5576 // the appropriate register range was selected. | |
| 5577 } else if (type == T_FLOAT || type == T_DOUBLE) { | |
| 5578 _first_reg = pd_first_fpu_reg; | |
| 5579 _last_reg = pd_last_fpu_reg; | |
| 5580 } else { | |
| 5581 _first_reg = pd_first_cpu_reg; | |
| 5582 _last_reg = pd_last_cpu_reg; | |
| 5583 } | |
| 5584 | |
| 5585 assert(0 <= _first_reg && _first_reg < LinearScan::nof_regs, "out of range"); | |
| 5586 assert(0 <= _last_reg && _last_reg < LinearScan::nof_regs, "out of range"); | |
| 5587 } | |
| 5588 | |
| 5589 | |
| 5590 bool LinearScanWalker::is_move(LIR_Op* op, Interval* from, Interval* to) { | |
| 5591 if (op->code() != lir_move) { | |
| 5592 return false; | |
| 5593 } | |
| 5594 assert(op->as_Op1() != NULL, "move must be LIR_Op1"); | |
| 5595 | |
| 5596 LIR_Opr in = ((LIR_Op1*)op)->in_opr(); | |
| 5597 LIR_Opr res = ((LIR_Op1*)op)->result_opr(); | |
| 5598 return in->is_virtual() && res->is_virtual() && in->vreg_number() == from->reg_num() && res->vreg_number() == to->reg_num(); | |
| 5599 } | |
| 5600 | |
| 5601 // optimization (especially for phi functions of nested loops): | |
| 5602 // assign same spill slot to non-intersecting intervals | |
| 5603 void LinearScanWalker::combine_spilled_intervals(Interval* cur) { | |
| 5604 if (cur->is_split_child()) { | |
| 5605 // optimization is only suitable for split parents | |
| 5606 return; | |
| 5607 } | |
| 5608 | |
| 5609 Interval* register_hint = cur->register_hint(false); | |
| 5610 if (register_hint == NULL) { | |
| 5611 // cur is not the target of a move, otherwise register_hint would be set | |
| 5612 return; | |
| 5613 } | |
| 5614 assert(register_hint->is_split_parent(), "register hint must be split parent"); | |
| 5615 | |
| 5616 if (cur->spill_state() != noOptimization || register_hint->spill_state() != noOptimization) { | |
| 5617 // combining the stack slots for intervals where spill move optimization is applied | |
| 5618 // is not benefitial and would cause problems | |
| 5619 return; | |
| 5620 } | |
| 5621 | |
| 5622 int begin_pos = cur->from(); | |
| 5623 int end_pos = cur->to(); | |
| 5624 if (end_pos > allocator()->max_lir_op_id() || (begin_pos & 1) != 0 || (end_pos & 1) != 0) { | |
| 5625 // safety check that lir_op_with_id is allowed | |
| 5626 return; | |
| 5627 } | |
| 5628 | |
| 5629 if (!is_move(allocator()->lir_op_with_id(begin_pos), register_hint, cur) || !is_move(allocator()->lir_op_with_id(end_pos), cur, register_hint)) { | |
| 5630 // cur and register_hint are not connected with two moves | |
| 5631 return; | |
| 5632 } | |
| 5633 | |
| 5634 Interval* begin_hint = register_hint->split_child_at_op_id(begin_pos, LIR_OpVisitState::inputMode); | |
| 5635 Interval* end_hint = register_hint->split_child_at_op_id(end_pos, LIR_OpVisitState::outputMode); | |
| 5636 if (begin_hint == end_hint || begin_hint->to() != begin_pos || end_hint->from() != end_pos) { | |
| 5637 // register_hint must be split, otherwise the re-writing of use positions does not work | |
| 5638 return; | |
| 5639 } | |
| 5640 | |
| 5641 assert(begin_hint->assigned_reg() != any_reg, "must have register assigned"); | |
| 5642 assert(end_hint->assigned_reg() == any_reg, "must not have register assigned"); | |
| 5643 assert(cur->first_usage(mustHaveRegister) == begin_pos, "must have use position at begin of interval because of move"); | |
| 5644 assert(end_hint->first_usage(mustHaveRegister) == end_pos, "must have use position at begin of interval because of move"); | |
| 5645 | |
| 5646 if (begin_hint->assigned_reg() < LinearScan::nof_regs) { | |
| 5647 // register_hint is not spilled at begin_pos, so it would not be benefitial to immediately spill cur | |
| 5648 return; | |
| 5649 } | |
| 5650 assert(register_hint->canonical_spill_slot() != -1, "must be set when part of interval was spilled"); | |
| 5651 | |
| 5652 // modify intervals such that cur gets the same stack slot as register_hint | |
| 5653 // delete use positions to prevent the intervals to get a register at beginning | |
| 5654 cur->set_canonical_spill_slot(register_hint->canonical_spill_slot()); | |
| 5655 cur->remove_first_use_pos(); | |
| 5656 end_hint->remove_first_use_pos(); | |
| 5657 } | |
| 5658 | |
| 5659 | |
| 5660 // allocate a physical register or memory location to an interval | |
| 5661 bool LinearScanWalker::activate_current() { | |
| 5662 Interval* cur = current(); | |
| 5663 bool result = true; | |
| 5664 | |
| 5665 TRACE_LINEAR_SCAN(2, tty->print ("+++++ activating interval "); cur->print()); | |
| 5666 TRACE_LINEAR_SCAN(4, tty->print_cr(" split_parent: %d, insert_move_when_activated: %d", cur->split_parent()->reg_num(), cur->insert_move_when_activated())); | |
| 5667 | |
| 5668 if (cur->assigned_reg() >= LinearScan::nof_regs) { | |
| 5669 // activating an interval that has a stack slot assigned -> split it at first use position | |
| 5670 // used for method parameters | |
| 5671 TRACE_LINEAR_SCAN(4, tty->print_cr(" interval has spill slot assigned (method parameter) -> split it before first use")); | |
| 5672 | |
| 5673 split_stack_interval(cur); | |
| 5674 result = false; | |
| 5675 | |
| 5676 } else if (allocator()->gen()->is_vreg_flag_set(cur->reg_num(), LIRGenerator::must_start_in_memory)) { | |
| 5677 // activating an interval that must start in a stack slot, but may get a register later | |
| 5678 // used for lir_roundfp: rounding is done by store to stack and reload later | |
| 5679 TRACE_LINEAR_SCAN(4, tty->print_cr(" interval must start in stack slot -> split it before first use")); | |
| 5680 assert(cur->assigned_reg() == any_reg && cur->assigned_regHi() == any_reg, "register already assigned"); | |
| 5681 | |
| 5682 allocator()->assign_spill_slot(cur); | |
| 5683 split_stack_interval(cur); | |
| 5684 result = false; | |
| 5685 | |
| 5686 } else if (cur->assigned_reg() == any_reg) { | |
| 5687 // interval has not assigned register -> normal allocation | |
| 5688 // (this is the normal case for most intervals) | |
| 5689 TRACE_LINEAR_SCAN(4, tty->print_cr(" normal allocation of register")); | |
| 5690 | |
| 5691 // assign same spill slot to non-intersecting intervals | |
| 5692 combine_spilled_intervals(cur); | |
| 5693 | |
| 5694 init_vars_for_alloc(cur); | |
| 5695 if (no_allocation_possible(cur) || !alloc_free_reg(cur)) { | |
| 5696 // no empty register available. | |
| 5697 // split and spill another interval so that this interval gets a register | |
| 5698 alloc_locked_reg(cur); | |
| 5699 } | |
| 5700 | |
| 5701 // spilled intervals need not be move to active-list | |
| 5702 if (cur->assigned_reg() >= LinearScan::nof_regs) { | |
| 5703 result = false; | |
| 5704 } | |
| 5705 } | |
| 5706 | |
| 5707 // load spilled values that become active from stack slot to register | |
| 5708 if (cur->insert_move_when_activated()) { | |
| 5709 assert(cur->is_split_child(), "must be"); | |
| 5710 assert(cur->current_split_child() != NULL, "must be"); | |
| 5711 assert(cur->current_split_child()->reg_num() != cur->reg_num(), "cannot insert move between same interval"); | |
| 5712 TRACE_LINEAR_SCAN(4, tty->print_cr("Inserting move from interval %d to %d because insert_move_when_activated is set", cur->current_split_child()->reg_num(), cur->reg_num())); | |
| 5713 | |
| 5714 insert_move(cur->from(), cur->current_split_child(), cur); | |
| 5715 } | |
| 5716 cur->make_current_split_child(); | |
| 5717 | |
| 5718 return result; // true = interval is moved to active list | |
| 5719 } | |
| 5720 | |
| 5721 | |
| 5722 // Implementation of EdgeMoveOptimizer | |
| 5723 | |
| 5724 EdgeMoveOptimizer::EdgeMoveOptimizer() : | |
| 5725 _edge_instructions(4), | |
| 5726 _edge_instructions_idx(4) | |
| 5727 { | |
| 5728 } | |
| 5729 | |
| 5730 void EdgeMoveOptimizer::optimize(BlockList* code) { | |
| 5731 EdgeMoveOptimizer optimizer = EdgeMoveOptimizer(); | |
| 5732 | |
| 5733 // ignore the first block in the list (index 0 is not processed) | |
| 5734 for (int i = code->length() - 1; i >= 1; i--) { | |
| 5735 BlockBegin* block = code->at(i); | |
| 5736 | |
| 5737 if (block->number_of_preds() > 1 && !block->is_set(BlockBegin::exception_entry_flag)) { | |
| 5738 optimizer.optimize_moves_at_block_end(block); | |
| 5739 } | |
| 5740 if (block->number_of_sux() == 2) { | |
| 5741 optimizer.optimize_moves_at_block_begin(block); | |
| 5742 } | |
| 5743 } | |
| 5744 } | |
| 5745 | |
| 5746 | |
| 5747 // clear all internal data structures | |
| 5748 void EdgeMoveOptimizer::init_instructions() { | |
| 5749 _edge_instructions.clear(); | |
| 5750 _edge_instructions_idx.clear(); | |
| 5751 } | |
| 5752 | |
| 5753 // append a lir-instruction-list and the index of the current operation in to the list | |
| 5754 void EdgeMoveOptimizer::append_instructions(LIR_OpList* instructions, int instructions_idx) { | |
| 5755 _edge_instructions.append(instructions); | |
| 5756 _edge_instructions_idx.append(instructions_idx); | |
| 5757 } | |
| 5758 | |
| 5759 // return the current operation of the given edge (predecessor or successor) | |
| 5760 LIR_Op* EdgeMoveOptimizer::instruction_at(int edge) { | |
| 5761 LIR_OpList* instructions = _edge_instructions.at(edge); | |
| 5762 int idx = _edge_instructions_idx.at(edge); | |
| 5763 | |
| 5764 if (idx < instructions->length()) { | |
| 5765 return instructions->at(idx); | |
| 5766 } else { | |
| 5767 return NULL; | |
| 5768 } | |
| 5769 } | |
| 5770 | |
| 5771 // removes the current operation of the given edge (predecessor or successor) | |
| 5772 void EdgeMoveOptimizer::remove_cur_instruction(int edge, bool decrement_index) { | |
| 5773 LIR_OpList* instructions = _edge_instructions.at(edge); | |
| 5774 int idx = _edge_instructions_idx.at(edge); | |
| 5775 instructions->remove_at(idx); | |
| 5776 | |
| 5777 if (decrement_index) { | |
| 5778 _edge_instructions_idx.at_put(edge, idx - 1); | |
| 5779 } | |
| 5780 } | |
| 5781 | |
| 5782 | |
| 5783 bool EdgeMoveOptimizer::operations_different(LIR_Op* op1, LIR_Op* op2) { | |
| 5784 if (op1 == NULL || op2 == NULL) { | |
| 5785 // at least one block is already empty -> no optimization possible | |
| 5786 return true; | |
| 5787 } | |
| 5788 | |
| 5789 if (op1->code() == lir_move && op2->code() == lir_move) { | |
| 5790 assert(op1->as_Op1() != NULL, "move must be LIR_Op1"); | |
| 5791 assert(op2->as_Op1() != NULL, "move must be LIR_Op1"); | |
| 5792 LIR_Op1* move1 = (LIR_Op1*)op1; | |
| 5793 LIR_Op1* move2 = (LIR_Op1*)op2; | |
| 5794 if (move1->info() == move2->info() && move1->in_opr() == move2->in_opr() && move1->result_opr() == move2->result_opr()) { | |
| 5795 // these moves are exactly equal and can be optimized | |
| 5796 return false; | |
| 5797 } | |
| 5798 | |
| 5799 } else if (op1->code() == lir_fxch && op2->code() == lir_fxch) { | |
| 5800 assert(op1->as_Op1() != NULL, "fxch must be LIR_Op1"); | |
| 5801 assert(op2->as_Op1() != NULL, "fxch must be LIR_Op1"); | |
| 5802 LIR_Op1* fxch1 = (LIR_Op1*)op1; | |
| 5803 LIR_Op1* fxch2 = (LIR_Op1*)op2; | |
| 5804 if (fxch1->in_opr()->as_jint() == fxch2->in_opr()->as_jint()) { | |
| 5805 // equal FPU stack operations can be optimized | |
| 5806 return false; | |
| 5807 } | |
| 5808 | |
| 5809 } else if (op1->code() == lir_fpop_raw && op2->code() == lir_fpop_raw) { | |
| 5810 // equal FPU stack operations can be optimized | |
| 5811 return false; | |
| 5812 } | |
| 5813 | |
| 5814 // no optimization possible | |
| 5815 return true; | |
| 5816 } | |
| 5817 | |
| 5818 void EdgeMoveOptimizer::optimize_moves_at_block_end(BlockBegin* block) { | |
| 5819 TRACE_LINEAR_SCAN(4, tty->print_cr("optimizing moves at end of block B%d", block->block_id())); | |
| 5820 | |
| 5821 if (block->is_predecessor(block)) { | |
| 5822 // currently we can't handle this correctly. | |
| 5823 return; | |
| 5824 } | |
| 5825 | |
| 5826 init_instructions(); | |
| 5827 int num_preds = block->number_of_preds(); | |
| 5828 assert(num_preds > 1, "do not call otherwise"); | |
| 5829 assert(!block->is_set(BlockBegin::exception_entry_flag), "exception handlers not allowed"); | |
| 5830 | |
| 5831 // setup a list with the lir-instructions of all predecessors | |
| 5832 int i; | |
| 5833 for (i = 0; i < num_preds; i++) { | |
| 5834 BlockBegin* pred = block->pred_at(i); | |
| 5835 LIR_OpList* pred_instructions = pred->lir()->instructions_list(); | |
| 5836 | |
| 5837 if (pred->number_of_sux() != 1) { | |
| 5838 // this can happen with switch-statements where multiple edges are between | |
| 5839 // the same blocks. | |
| 5840 return; | |
| 5841 } | |
| 5842 | |
| 5843 assert(pred->number_of_sux() == 1, "can handle only one successor"); | |
| 5844 assert(pred->sux_at(0) == block, "invalid control flow"); | |
| 5845 assert(pred_instructions->last()->code() == lir_branch, "block with successor must end with branch"); | |
| 5846 assert(pred_instructions->last()->as_OpBranch() != NULL, "branch must be LIR_OpBranch"); | |
| 5847 assert(pred_instructions->last()->as_OpBranch()->cond() == lir_cond_always, "block must end with unconditional branch"); | |
| 5848 | |
| 5849 if (pred_instructions->last()->info() != NULL) { | |
| 5850 // can not optimize instructions when debug info is needed | |
| 5851 return; | |
| 5852 } | |
| 5853 | |
| 5854 // ignore the unconditional branch at the end of the block | |
| 5855 append_instructions(pred_instructions, pred_instructions->length() - 2); | |
| 5856 } | |
| 5857 | |
| 5858 | |
| 5859 // process lir-instructions while all predecessors end with the same instruction | |
| 5860 while (true) { | |
| 5861 LIR_Op* op = instruction_at(0); | |
| 5862 for (i = 1; i < num_preds; i++) { | |
| 5863 if (operations_different(op, instruction_at(i))) { | |
| 5864 // these instructions are different and cannot be optimized -> | |
| 5865 // no further optimization possible | |
| 5866 return; | |
| 5867 } | |
| 5868 } | |
| 5869 | |
| 5870 TRACE_LINEAR_SCAN(4, tty->print("found instruction that is equal in all %d predecessors: ", num_preds); op->print()); | |
| 5871 | |
| 5872 // insert the instruction at the beginning of the current block | |
| 5873 block->lir()->insert_before(1, op); | |
| 5874 | |
| 5875 // delete the instruction at the end of all predecessors | |
| 5876 for (i = 0; i < num_preds; i++) { | |
| 5877 remove_cur_instruction(i, true); | |
| 5878 } | |
| 5879 } | |
| 5880 } | |
| 5881 | |
| 5882 | |
| 5883 void EdgeMoveOptimizer::optimize_moves_at_block_begin(BlockBegin* block) { | |
| 5884 TRACE_LINEAR_SCAN(4, tty->print_cr("optimization moves at begin of block B%d", block->block_id())); | |
| 5885 | |
| 5886 init_instructions(); | |
| 5887 int num_sux = block->number_of_sux(); | |
| 5888 | |
| 5889 LIR_OpList* cur_instructions = block->lir()->instructions_list(); | |
| 5890 | |
| 5891 assert(num_sux == 2, "method should not be called otherwise"); | |
| 5892 assert(cur_instructions->last()->code() == lir_branch, "block with successor must end with branch"); | |
| 5893 assert(cur_instructions->last()->as_OpBranch() != NULL, "branch must be LIR_OpBranch"); | |
| 5894 assert(cur_instructions->last()->as_OpBranch()->cond() == lir_cond_always, "block must end with unconditional branch"); | |
| 5895 | |
| 5896 if (cur_instructions->last()->info() != NULL) { | |
| 5897 // can no optimize instructions when debug info is needed | |
| 5898 return; | |
| 5899 } | |
| 5900 | |
| 5901 LIR_Op* branch = cur_instructions->at(cur_instructions->length() - 2); | |
| 5902 if (branch->info() != NULL || (branch->code() != lir_branch && branch->code() != lir_cond_float_branch)) { | |
| 5903 // not a valid case for optimization | |
| 5904 // currently, only blocks that end with two branches (conditional branch followed | |
| 5905 // by unconditional branch) are optimized | |
| 5906 return; | |
| 5907 } | |
| 5908 | |
| 5909 // now it is guaranteed that the block ends with two branch instructions. | |
| 5910 // the instructions are inserted at the end of the block before these two branches | |
| 5911 int insert_idx = cur_instructions->length() - 2; | |
| 5912 | |
| 5913 int i; | |
| 5914 #ifdef ASSERT | |
| 5915 for (i = insert_idx - 1; i >= 0; i--) { | |
| 5916 LIR_Op* op = cur_instructions->at(i); | |
| 5917 if ((op->code() == lir_branch || op->code() == lir_cond_float_branch) && ((LIR_OpBranch*)op)->block() != NULL) { | |
| 5918 assert(false, "block with two successors can have only two branch instructions"); | |
| 5919 } | |
| 5920 } | |
| 5921 #endif | |
| 5922 | |
| 5923 // setup a list with the lir-instructions of all successors | |
| 5924 for (i = 0; i < num_sux; i++) { | |
| 5925 BlockBegin* sux = block->sux_at(i); | |
| 5926 LIR_OpList* sux_instructions = sux->lir()->instructions_list(); | |
| 5927 | |
| 5928 assert(sux_instructions->at(0)->code() == lir_label, "block must start with label"); | |
| 5929 | |
| 5930 if (sux->number_of_preds() != 1) { | |
| 5931 // this can happen with switch-statements where multiple edges are between | |
| 5932 // the same blocks. | |
| 5933 return; | |
| 5934 } | |
| 5935 assert(sux->pred_at(0) == block, "invalid control flow"); | |
| 5936 assert(!sux->is_set(BlockBegin::exception_entry_flag), "exception handlers not allowed"); | |
| 5937 | |
| 5938 // ignore the label at the beginning of the block | |
| 5939 append_instructions(sux_instructions, 1); | |
| 5940 } | |
| 5941 | |
| 5942 // process lir-instructions while all successors begin with the same instruction | |
| 5943 while (true) { | |
| 5944 LIR_Op* op = instruction_at(0); | |
| 5945 for (i = 1; i < num_sux; i++) { | |
| 5946 if (operations_different(op, instruction_at(i))) { | |
| 5947 // these instructions are different and cannot be optimized -> | |
| 5948 // no further optimization possible | |
| 5949 return; | |
| 5950 } | |
| 5951 } | |
| 5952 | |
| 5953 TRACE_LINEAR_SCAN(4, tty->print("----- found instruction that is equal in all %d successors: ", num_sux); op->print()); | |
| 5954 | |
| 5955 // insert instruction at end of current block | |
| 5956 block->lir()->insert_before(insert_idx, op); | |
| 5957 insert_idx++; | |
| 5958 | |
| 5959 // delete the instructions at the beginning of all successors | |
| 5960 for (i = 0; i < num_sux; i++) { | |
| 5961 remove_cur_instruction(i, false); | |
| 5962 } | |
| 5963 } | |
| 5964 } | |
| 5965 | |
| 5966 | |
| 5967 // Implementation of ControlFlowOptimizer | |
| 5968 | |
| 5969 ControlFlowOptimizer::ControlFlowOptimizer() : | |
| 5970 _original_preds(4) | |
| 5971 { | |
| 5972 } | |
| 5973 | |
| 5974 void ControlFlowOptimizer::optimize(BlockList* code) { | |
| 5975 ControlFlowOptimizer optimizer = ControlFlowOptimizer(); | |
| 5976 | |
| 5977 // push the OSR entry block to the end so that we're not jumping over it. | |
| 5978 BlockBegin* osr_entry = code->at(0)->end()->as_Base()->osr_entry(); | |
| 5979 if (osr_entry) { | |
| 5980 int index = osr_entry->linear_scan_number(); | |
| 5981 assert(code->at(index) == osr_entry, "wrong index"); | |
| 5982 code->remove_at(index); | |
| 5983 code->append(osr_entry); | |
| 5984 } | |
| 5985 | |
| 5986 optimizer.reorder_short_loops(code); | |
| 5987 optimizer.delete_empty_blocks(code); | |
| 5988 optimizer.delete_unnecessary_jumps(code); | |
| 5989 optimizer.delete_jumps_to_return(code); | |
| 5990 } | |
| 5991 | |
| 5992 void ControlFlowOptimizer::reorder_short_loop(BlockList* code, BlockBegin* header_block, int header_idx) { | |
| 5993 int i = header_idx + 1; | |
| 5994 int max_end = MIN2(header_idx + ShortLoopSize, code->length()); | |
| 5995 while (i < max_end && code->at(i)->loop_depth() >= header_block->loop_depth()) { | |
| 5996 i++; | |
| 5997 } | |
| 5998 | |
| 5999 if (i == code->length() || code->at(i)->loop_depth() < header_block->loop_depth()) { | |
| 6000 int end_idx = i - 1; | |
| 6001 BlockBegin* end_block = code->at(end_idx); | |
| 6002 | |
| 6003 if (end_block->number_of_sux() == 1 && end_block->sux_at(0) == header_block) { | |
| 6004 // short loop from header_idx to end_idx found -> reorder blocks such that | |
| 6005 // the header_block is the last block instead of the first block of the loop | |
| 6006 TRACE_LINEAR_SCAN(1, tty->print_cr("Reordering short loop: length %d, header B%d, end B%d", | |
| 6007 end_idx - header_idx + 1, | |
| 6008 header_block->block_id(), end_block->block_id())); | |
| 6009 | |
| 6010 for (int j = header_idx; j < end_idx; j++) { | |
| 6011 code->at_put(j, code->at(j + 1)); | |
| 6012 } | |
| 6013 code->at_put(end_idx, header_block); | |
| 6014 | |
| 6015 // correct the flags so that any loop alignment occurs in the right place. | |
| 6016 assert(code->at(end_idx)->is_set(BlockBegin::backward_branch_target_flag), "must be backward branch target"); | |
| 6017 code->at(end_idx)->clear(BlockBegin::backward_branch_target_flag); | |
| 6018 code->at(header_idx)->set(BlockBegin::backward_branch_target_flag); | |
| 6019 } | |
| 6020 } | |
| 6021 } | |
| 6022 | |
| 6023 void ControlFlowOptimizer::reorder_short_loops(BlockList* code) { | |
| 6024 for (int i = code->length() - 1; i >= 0; i--) { | |
| 6025 BlockBegin* block = code->at(i); | |
| 6026 | |
| 6027 if (block->is_set(BlockBegin::linear_scan_loop_header_flag)) { | |
| 6028 reorder_short_loop(code, block, i); | |
| 6029 } | |
| 6030 } | |
| 6031 | |
| 6032 DEBUG_ONLY(verify(code)); | |
| 6033 } | |
| 6034 | |
| 6035 // only blocks with exactly one successor can be deleted. Such blocks | |
| 6036 // must always end with an unconditional branch to this successor | |
| 6037 bool ControlFlowOptimizer::can_delete_block(BlockBegin* block) { | |
| 6038 if (block->number_of_sux() != 1 || block->number_of_exception_handlers() != 0 || block->is_entry_block()) { | |
| 6039 return false; | |
| 6040 } | |
| 6041 | |
| 6042 LIR_OpList* instructions = block->lir()->instructions_list(); | |
| 6043 | |
| 6044 assert(instructions->length() >= 2, "block must have label and branch"); | |
| 6045 assert(instructions->at(0)->code() == lir_label, "first instruction must always be a label"); | |
| 6046 assert(instructions->last()->as_OpBranch() != NULL, "last instrcution must always be a branch"); | |
| 6047 assert(instructions->last()->as_OpBranch()->cond() == lir_cond_always, "branch must be unconditional"); | |
| 6048 assert(instructions->last()->as_OpBranch()->block() == block->sux_at(0), "branch target must be the successor"); | |
| 6049 | |
| 6050 // block must have exactly one successor | |
| 6051 | |
| 6052 if (instructions->length() == 2 && instructions->last()->info() == NULL) { | |
| 6053 return true; | |
| 6054 } | |
| 6055 return false; | |
| 6056 } | |
| 6057 | |
| 6058 // substitute branch targets in all branch-instructions of this blocks | |
| 6059 void ControlFlowOptimizer::substitute_branch_target(BlockBegin* block, BlockBegin* target_from, BlockBegin* target_to) { | |
| 6060 TRACE_LINEAR_SCAN(3, tty->print_cr("Deleting empty block: substituting from B%d to B%d inside B%d", target_from->block_id(), target_to->block_id(), block->block_id())); | |
| 6061 | |
| 6062 LIR_OpList* instructions = block->lir()->instructions_list(); | |
| 6063 | |
| 6064 assert(instructions->at(0)->code() == lir_label, "first instruction must always be a label"); | |
| 6065 for (int i = instructions->length() - 1; i >= 1; i--) { | |
| 6066 LIR_Op* op = instructions->at(i); | |
| 6067 | |
| 6068 if (op->code() == lir_branch || op->code() == lir_cond_float_branch) { | |
| 6069 assert(op->as_OpBranch() != NULL, "branch must be of type LIR_OpBranch"); | |
| 6070 LIR_OpBranch* branch = (LIR_OpBranch*)op; | |
| 6071 | |
| 6072 if (branch->block() == target_from) { | |
| 6073 branch->change_block(target_to); | |
| 6074 } | |
| 6075 if (branch->ublock() == target_from) { | |
| 6076 branch->change_ublock(target_to); | |
| 6077 } | |
| 6078 } | |
| 6079 } | |
| 6080 } | |
| 6081 | |
| 6082 void ControlFlowOptimizer::delete_empty_blocks(BlockList* code) { | |
| 6083 int old_pos = 0; | |
| 6084 int new_pos = 0; | |
| 6085 int num_blocks = code->length(); | |
| 6086 | |
| 6087 while (old_pos < num_blocks) { | |
| 6088 BlockBegin* block = code->at(old_pos); | |
| 6089 | |
| 6090 if (can_delete_block(block)) { | |
| 6091 BlockBegin* new_target = block->sux_at(0); | |
| 6092 | |
| 6093 // propagate backward branch target flag for correct code alignment | |
| 6094 if (block->is_set(BlockBegin::backward_branch_target_flag)) { | |
| 6095 new_target->set(BlockBegin::backward_branch_target_flag); | |
| 6096 } | |
| 6097 | |
| 6098 // collect a list with all predecessors that contains each predecessor only once | |
| 6099 // the predecessors of cur are changed during the substitution, so a copy of the | |
| 6100 // predecessor list is necessary | |
| 6101 int j; | |
| 6102 _original_preds.clear(); | |
| 6103 for (j = block->number_of_preds() - 1; j >= 0; j--) { | |
| 6104 BlockBegin* pred = block->pred_at(j); | |
| 6105 if (_original_preds.index_of(pred) == -1) { | |
| 6106 _original_preds.append(pred); | |
| 6107 } | |
| 6108 } | |
| 6109 | |
| 6110 for (j = _original_preds.length() - 1; j >= 0; j--) { | |
| 6111 BlockBegin* pred = _original_preds.at(j); | |
| 6112 substitute_branch_target(pred, block, new_target); | |
| 6113 pred->substitute_sux(block, new_target); | |
| 6114 } | |
| 6115 } else { | |
| 6116 // adjust position of this block in the block list if blocks before | |
| 6117 // have been deleted | |
| 6118 if (new_pos != old_pos) { | |
| 6119 code->at_put(new_pos, code->at(old_pos)); | |
| 6120 } | |
| 6121 new_pos++; | |
| 6122 } | |
| 6123 old_pos++; | |
| 6124 } | |
| 6125 code->truncate(new_pos); | |
| 6126 | |
| 6127 DEBUG_ONLY(verify(code)); | |
| 6128 } | |
| 6129 | |
| 6130 void ControlFlowOptimizer::delete_unnecessary_jumps(BlockList* code) { | |
| 6131 // skip the last block because there a branch is always necessary | |
| 6132 for (int i = code->length() - 2; i >= 0; i--) { | |
| 6133 BlockBegin* block = code->at(i); | |
| 6134 LIR_OpList* instructions = block->lir()->instructions_list(); | |
| 6135 | |
| 6136 LIR_Op* last_op = instructions->last(); | |
| 6137 if (last_op->code() == lir_branch) { | |
| 6138 assert(last_op->as_OpBranch() != NULL, "branch must be of type LIR_OpBranch"); | |
| 6139 LIR_OpBranch* last_branch = (LIR_OpBranch*)last_op; | |
| 6140 | |
| 6141 assert(last_branch->block() != NULL, "last branch must always have a block as target"); | |
| 6142 assert(last_branch->label() == last_branch->block()->label(), "must be equal"); | |
| 6143 | |
| 6144 if (last_branch->info() == NULL) { | |
| 6145 if (last_branch->block() == code->at(i + 1)) { | |
| 6146 | |
| 6147 TRACE_LINEAR_SCAN(3, tty->print_cr("Deleting unconditional branch at end of block B%d", block->block_id())); | |
| 6148 | |
| 6149 // delete last branch instruction | |
| 6150 instructions->truncate(instructions->length() - 1); | |
| 6151 | |
| 6152 } else { | |
| 6153 LIR_Op* prev_op = instructions->at(instructions->length() - 2); | |
| 6154 if (prev_op->code() == lir_branch || prev_op->code() == lir_cond_float_branch) { | |
| 6155 assert(prev_op->as_OpBranch() != NULL, "branch must be of type LIR_OpBranch"); | |
| 6156 LIR_OpBranch* prev_branch = (LIR_OpBranch*)prev_op; | |
| 6157 | |
|
1681
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diff
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6158 LIR_Op2* prev_cmp = NULL; |
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6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
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6159 |
|
126ea7725993
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parents:
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diff
changeset
|
6160 for(int j = instructions->length() - 3; j >= 0 && prev_cmp == NULL; j--) { |
|
126ea7725993
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bobv
parents:
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diff
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|
6161 prev_op = instructions->at(j); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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6162 if(prev_op->code() == lir_cmp) { |
|
126ea7725993
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6163 assert(prev_op->as_Op2() != NULL, "branch must be of type LIR_Op2"); |
|
126ea7725993
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|
6164 prev_cmp = (LIR_Op2*)prev_op; |
|
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|
6165 assert(prev_branch->cond() == prev_cmp->condition(), "should be the same"); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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|
6166 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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|
6167 } |
|
126ea7725993
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parents:
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|
6168 assert(prev_cmp != NULL, "should have found comp instruction for branch"); |
| 0 | 6169 if (prev_branch->block() == code->at(i + 1) && prev_branch->info() == NULL) { |
| 6170 | |
| 6171 TRACE_LINEAR_SCAN(3, tty->print_cr("Negating conditional branch and deleting unconditional branch at end of block B%d", block->block_id())); | |
| 6172 | |
| 6173 // eliminate a conditional branch to the immediate successor | |
| 6174 prev_branch->change_block(last_branch->block()); | |
| 6175 prev_branch->negate_cond(); | |
|
1681
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|
6176 prev_cmp->set_condition(prev_branch->cond()); |
| 0 | 6177 instructions->truncate(instructions->length() - 1); |
| 6178 } | |
| 6179 } | |
| 6180 } | |
| 6181 } | |
| 6182 } | |
| 6183 } | |
| 6184 | |
| 6185 DEBUG_ONLY(verify(code)); | |
| 6186 } | |
| 6187 | |
| 6188 void ControlFlowOptimizer::delete_jumps_to_return(BlockList* code) { | |
| 6189 #ifdef ASSERT | |
| 6190 BitMap return_converted(BlockBegin::number_of_blocks()); | |
| 6191 return_converted.clear(); | |
| 6192 #endif | |
| 6193 | |
| 6194 for (int i = code->length() - 1; i >= 0; i--) { | |
| 6195 BlockBegin* block = code->at(i); | |
| 6196 LIR_OpList* cur_instructions = block->lir()->instructions_list(); | |
| 6197 LIR_Op* cur_last_op = cur_instructions->last(); | |
| 6198 | |
| 6199 assert(cur_instructions->at(0)->code() == lir_label, "first instruction must always be a label"); | |
| 6200 if (cur_instructions->length() == 2 && cur_last_op->code() == lir_return) { | |
| 6201 // the block contains only a label and a return | |
| 6202 // if a predecessor ends with an unconditional jump to this block, then the jump | |
| 6203 // can be replaced with a return instruction | |
| 6204 // | |
| 6205 // Note: the original block with only a return statement cannot be deleted completely | |
| 6206 // because the predecessors might have other (conditional) jumps to this block | |
| 6207 // -> this may lead to unnecesary return instructions in the final code | |
| 6208 | |
| 6209 assert(cur_last_op->info() == NULL, "return instructions do not have debug information"); | |
| 6210 assert(block->number_of_sux() == 0 || | |
| 6211 (return_converted.at(block->block_id()) && block->number_of_sux() == 1), | |
| 6212 "blocks that end with return must not have successors"); | |
| 6213 | |
| 6214 assert(cur_last_op->as_Op1() != NULL, "return must be LIR_Op1"); | |
| 6215 LIR_Opr return_opr = ((LIR_Op1*)cur_last_op)->in_opr(); | |
| 6216 | |
| 6217 for (int j = block->number_of_preds() - 1; j >= 0; j--) { | |
| 6218 BlockBegin* pred = block->pred_at(j); | |
| 6219 LIR_OpList* pred_instructions = pred->lir()->instructions_list(); | |
| 6220 LIR_Op* pred_last_op = pred_instructions->last(); | |
| 6221 | |
| 6222 if (pred_last_op->code() == lir_branch) { | |
| 6223 assert(pred_last_op->as_OpBranch() != NULL, "branch must be LIR_OpBranch"); | |
| 6224 LIR_OpBranch* pred_last_branch = (LIR_OpBranch*)pred_last_op; | |
| 6225 | |
| 6226 if (pred_last_branch->block() == block && pred_last_branch->cond() == lir_cond_always && pred_last_branch->info() == NULL) { | |
| 6227 // replace the jump to a return with a direct return | |
| 6228 // Note: currently the edge between the blocks is not deleted | |
| 6229 pred_instructions->at_put(pred_instructions->length() - 1, new LIR_Op1(lir_return, return_opr)); | |
| 6230 #ifdef ASSERT | |
| 6231 return_converted.set_bit(pred->block_id()); | |
| 6232 #endif | |
| 6233 } | |
| 6234 } | |
| 6235 } | |
| 6236 } | |
| 6237 } | |
| 6238 } | |
| 6239 | |
| 6240 | |
| 6241 #ifdef ASSERT | |
| 6242 void ControlFlowOptimizer::verify(BlockList* code) { | |
| 6243 for (int i = 0; i < code->length(); i++) { | |
| 6244 BlockBegin* block = code->at(i); | |
| 6245 LIR_OpList* instructions = block->lir()->instructions_list(); | |
| 6246 | |
| 6247 int j; | |
| 6248 for (j = 0; j < instructions->length(); j++) { | |
| 6249 LIR_OpBranch* op_branch = instructions->at(j)->as_OpBranch(); | |
| 6250 | |
| 6251 if (op_branch != NULL) { | |
| 6252 assert(op_branch->block() == NULL || code->index_of(op_branch->block()) != -1, "branch target not valid"); | |
| 6253 assert(op_branch->ublock() == NULL || code->index_of(op_branch->ublock()) != -1, "branch target not valid"); | |
| 6254 } | |
| 6255 } | |
| 6256 | |
| 6257 for (j = 0; j < block->number_of_sux() - 1; j++) { | |
| 6258 BlockBegin* sux = block->sux_at(j); | |
| 6259 assert(code->index_of(sux) != -1, "successor not valid"); | |
| 6260 } | |
| 6261 | |
| 6262 for (j = 0; j < block->number_of_preds() - 1; j++) { | |
| 6263 BlockBegin* pred = block->pred_at(j); | |
| 6264 assert(code->index_of(pred) != -1, "successor not valid"); | |
| 6265 } | |
| 6266 } | |
| 6267 } | |
| 6268 #endif | |
| 6269 | |
| 6270 | |
| 6271 #ifndef PRODUCT | |
| 6272 | |
| 6273 // Implementation of LinearStatistic | |
| 6274 | |
| 6275 const char* LinearScanStatistic::counter_name(int counter_idx) { | |
| 6276 switch (counter_idx) { | |
| 6277 case counter_method: return "compiled methods"; | |
| 6278 case counter_fpu_method: return "methods using fpu"; | |
| 6279 case counter_loop_method: return "methods with loops"; | |
| 6280 case counter_exception_method:return "methods with xhandler"; | |
| 6281 | |
| 6282 case counter_loop: return "loops"; | |
| 6283 case counter_block: return "blocks"; | |
| 6284 case counter_loop_block: return "blocks inside loop"; | |
| 6285 case counter_exception_block: return "exception handler entries"; | |
| 6286 case counter_interval: return "intervals"; | |
| 6287 case counter_fixed_interval: return "fixed intervals"; | |
| 6288 case counter_range: return "ranges"; | |
| 6289 case counter_fixed_range: return "fixed ranges"; | |
| 6290 case counter_use_pos: return "use positions"; | |
| 6291 case counter_fixed_use_pos: return "fixed use positions"; | |
| 6292 case counter_spill_slots: return "spill slots"; | |
| 6293 | |
| 6294 // counter for classes of lir instructions | |
| 6295 case counter_instruction: return "total instructions"; | |
| 6296 case counter_label: return "labels"; | |
| 6297 case counter_entry: return "method entries"; | |
| 6298 case counter_return: return "method returns"; | |
| 6299 case counter_call: return "method calls"; | |
| 6300 case counter_move: return "moves"; | |
| 6301 case counter_cmp: return "compare"; | |
| 6302 case counter_cond_branch: return "conditional branches"; | |
| 6303 case counter_uncond_branch: return "unconditional branches"; | |
| 6304 case counter_stub_branch: return "branches to stub"; | |
| 6305 case counter_alu: return "artithmetic + logic"; | |
| 6306 case counter_alloc: return "allocations"; | |
| 6307 case counter_sync: return "synchronisation"; | |
| 6308 case counter_throw: return "throw"; | |
| 6309 case counter_unwind: return "unwind"; | |
| 6310 case counter_typecheck: return "type+null-checks"; | |
| 6311 case counter_fpu_stack: return "fpu-stack"; | |
| 6312 case counter_misc_inst: return "other instructions"; | |
| 6313 case counter_other_inst: return "misc. instructions"; | |
| 6314 | |
| 6315 // counter for different types of moves | |
| 6316 case counter_move_total: return "total moves"; | |
| 6317 case counter_move_reg_reg: return "register->register"; | |
| 6318 case counter_move_reg_stack: return "register->stack"; | |
| 6319 case counter_move_stack_reg: return "stack->register"; | |
| 6320 case counter_move_stack_stack:return "stack->stack"; | |
| 6321 case counter_move_reg_mem: return "register->memory"; | |
| 6322 case counter_move_mem_reg: return "memory->register"; | |
| 6323 case counter_move_const_any: return "constant->any"; | |
| 6324 | |
| 6325 case blank_line_1: return ""; | |
| 6326 case blank_line_2: return ""; | |
| 6327 | |
| 6328 default: ShouldNotReachHere(); return ""; | |
| 6329 } | |
| 6330 } | |
| 6331 | |
| 6332 LinearScanStatistic::Counter LinearScanStatistic::base_counter(int counter_idx) { | |
| 6333 if (counter_idx == counter_fpu_method || counter_idx == counter_loop_method || counter_idx == counter_exception_method) { | |
| 6334 return counter_method; | |
| 6335 } else if (counter_idx == counter_loop_block || counter_idx == counter_exception_block) { | |
| 6336 return counter_block; | |
| 6337 } else if (counter_idx >= counter_instruction && counter_idx <= counter_other_inst) { | |
| 6338 return counter_instruction; | |
| 6339 } else if (counter_idx >= counter_move_total && counter_idx <= counter_move_const_any) { | |
| 6340 return counter_move_total; | |
| 6341 } | |
| 6342 return invalid_counter; | |
| 6343 } | |
| 6344 | |
| 6345 LinearScanStatistic::LinearScanStatistic() { | |
| 6346 for (int i = 0; i < number_of_counters; i++) { | |
| 6347 _counters_sum[i] = 0; | |
| 6348 _counters_max[i] = -1; | |
| 6349 } | |
| 6350 | |
| 6351 } | |
| 6352 | |
| 6353 // add the method-local numbers to the total sum | |
| 6354 void LinearScanStatistic::sum_up(LinearScanStatistic &method_statistic) { | |
| 6355 for (int i = 0; i < number_of_counters; i++) { | |
| 6356 _counters_sum[i] += method_statistic._counters_sum[i]; | |
| 6357 _counters_max[i] = MAX2(_counters_max[i], method_statistic._counters_sum[i]); | |
| 6358 } | |
| 6359 } | |
| 6360 | |
| 6361 void LinearScanStatistic::print(const char* title) { | |
| 6362 if (CountLinearScan || TraceLinearScanLevel > 0) { | |
| 6363 tty->cr(); | |
| 6364 tty->print_cr("***** LinearScan statistic - %s *****", title); | |
| 6365 | |
| 6366 for (int i = 0; i < number_of_counters; i++) { | |
| 6367 if (_counters_sum[i] > 0 || _counters_max[i] >= 0) { | |
| 6368 tty->print("%25s: %8d", counter_name(i), _counters_sum[i]); | |
| 6369 | |
| 6370 if (base_counter(i) != invalid_counter) { | |
| 6371 tty->print(" (%5.1f%%) ", _counters_sum[i] * 100.0 / _counters_sum[base_counter(i)]); | |
| 6372 } else { | |
| 6373 tty->print(" "); | |
| 6374 } | |
| 6375 | |
| 6376 if (_counters_max[i] >= 0) { | |
| 6377 tty->print("%8d", _counters_max[i]); | |
| 6378 } | |
| 6379 } | |
| 6380 tty->cr(); | |
| 6381 } | |
| 6382 } | |
| 6383 } | |
| 6384 | |
| 6385 void LinearScanStatistic::collect(LinearScan* allocator) { | |
| 6386 inc_counter(counter_method); | |
| 6387 if (allocator->has_fpu_registers()) { | |
| 6388 inc_counter(counter_fpu_method); | |
| 6389 } | |
| 6390 if (allocator->num_loops() > 0) { | |
| 6391 inc_counter(counter_loop_method); | |
| 6392 } | |
| 6393 inc_counter(counter_loop, allocator->num_loops()); | |
| 6394 inc_counter(counter_spill_slots, allocator->max_spills()); | |
| 6395 | |
| 6396 int i; | |
| 6397 for (i = 0; i < allocator->interval_count(); i++) { | |
| 6398 Interval* cur = allocator->interval_at(i); | |
| 6399 | |
| 6400 if (cur != NULL) { | |
| 6401 inc_counter(counter_interval); | |
| 6402 inc_counter(counter_use_pos, cur->num_use_positions()); | |
| 6403 if (LinearScan::is_precolored_interval(cur)) { | |
| 6404 inc_counter(counter_fixed_interval); | |
| 6405 inc_counter(counter_fixed_use_pos, cur->num_use_positions()); | |
| 6406 } | |
| 6407 | |
| 6408 Range* range = cur->first(); | |
| 6409 while (range != Range::end()) { | |
| 6410 inc_counter(counter_range); | |
| 6411 if (LinearScan::is_precolored_interval(cur)) { | |
| 6412 inc_counter(counter_fixed_range); | |
| 6413 } | |
| 6414 range = range->next(); | |
| 6415 } | |
| 6416 } | |
| 6417 } | |
| 6418 | |
| 6419 bool has_xhandlers = false; | |
| 6420 // Note: only count blocks that are in code-emit order | |
| 6421 for (i = 0; i < allocator->ir()->code()->length(); i++) { | |
| 6422 BlockBegin* cur = allocator->ir()->code()->at(i); | |
| 6423 | |
| 6424 inc_counter(counter_block); | |
| 6425 if (cur->loop_depth() > 0) { | |
| 6426 inc_counter(counter_loop_block); | |
| 6427 } | |
| 6428 if (cur->is_set(BlockBegin::exception_entry_flag)) { | |
| 6429 inc_counter(counter_exception_block); | |
| 6430 has_xhandlers = true; | |
| 6431 } | |
| 6432 | |
| 6433 LIR_OpList* instructions = cur->lir()->instructions_list(); | |
| 6434 for (int j = 0; j < instructions->length(); j++) { | |
| 6435 LIR_Op* op = instructions->at(j); | |
| 6436 | |
| 6437 inc_counter(counter_instruction); | |
| 6438 | |
| 6439 switch (op->code()) { | |
| 6440 case lir_label: inc_counter(counter_label); break; | |
| 6441 case lir_std_entry: | |
| 6442 case lir_osr_entry: inc_counter(counter_entry); break; | |
| 6443 case lir_return: inc_counter(counter_return); break; | |
| 6444 | |
| 6445 case lir_rtcall: | |
| 6446 case lir_static_call: | |
| 6447 case lir_optvirtual_call: | |
| 6448 case lir_virtual_call: inc_counter(counter_call); break; | |
| 6449 | |
| 6450 case lir_move: { | |
| 6451 inc_counter(counter_move); | |
| 6452 inc_counter(counter_move_total); | |
| 6453 | |
| 6454 LIR_Opr in = op->as_Op1()->in_opr(); | |
| 6455 LIR_Opr res = op->as_Op1()->result_opr(); | |
| 6456 if (in->is_register()) { | |
| 6457 if (res->is_register()) { | |
| 6458 inc_counter(counter_move_reg_reg); | |
| 6459 } else if (res->is_stack()) { | |
| 6460 inc_counter(counter_move_reg_stack); | |
| 6461 } else if (res->is_address()) { | |
| 6462 inc_counter(counter_move_reg_mem); | |
| 6463 } else { | |
| 6464 ShouldNotReachHere(); | |
| 6465 } | |
| 6466 } else if (in->is_stack()) { | |
| 6467 if (res->is_register()) { | |
| 6468 inc_counter(counter_move_stack_reg); | |
| 6469 } else { | |
| 6470 inc_counter(counter_move_stack_stack); | |
| 6471 } | |
| 6472 } else if (in->is_address()) { | |
| 6473 assert(res->is_register(), "must be"); | |
| 6474 inc_counter(counter_move_mem_reg); | |
| 6475 } else if (in->is_constant()) { | |
| 6476 inc_counter(counter_move_const_any); | |
| 6477 } else { | |
| 6478 ShouldNotReachHere(); | |
| 6479 } | |
| 6480 break; | |
| 6481 } | |
| 6482 | |
| 6483 case lir_cmp: inc_counter(counter_cmp); break; | |
| 6484 | |
| 6485 case lir_branch: | |
| 6486 case lir_cond_float_branch: { | |
| 6487 LIR_OpBranch* branch = op->as_OpBranch(); | |
| 6488 if (branch->block() == NULL) { | |
| 6489 inc_counter(counter_stub_branch); | |
| 6490 } else if (branch->cond() == lir_cond_always) { | |
| 6491 inc_counter(counter_uncond_branch); | |
| 6492 } else { | |
| 6493 inc_counter(counter_cond_branch); | |
| 6494 } | |
| 6495 break; | |
| 6496 } | |
| 6497 | |
| 6498 case lir_neg: | |
| 6499 case lir_add: | |
| 6500 case lir_sub: | |
| 6501 case lir_mul: | |
| 6502 case lir_mul_strictfp: | |
| 6503 case lir_div: | |
| 6504 case lir_div_strictfp: | |
| 6505 case lir_rem: | |
| 6506 case lir_sqrt: | |
| 6507 case lir_sin: | |
| 6508 case lir_cos: | |
| 6509 case lir_abs: | |
| 6510 case lir_log10: | |
| 6511 case lir_log: | |
| 6512 case lir_logic_and: | |
| 6513 case lir_logic_or: | |
| 6514 case lir_logic_xor: | |
| 6515 case lir_shl: | |
| 6516 case lir_shr: | |
| 6517 case lir_ushr: inc_counter(counter_alu); break; | |
| 6518 | |
| 6519 case lir_alloc_object: | |
| 6520 case lir_alloc_array: inc_counter(counter_alloc); break; | |
| 6521 | |
| 6522 case lir_monaddr: | |
| 6523 case lir_lock: | |
| 6524 case lir_unlock: inc_counter(counter_sync); break; | |
| 6525 | |
| 6526 case lir_throw: inc_counter(counter_throw); break; | |
| 6527 | |
| 6528 case lir_unwind: inc_counter(counter_unwind); break; | |
| 6529 | |
| 6530 case lir_null_check: | |
| 6531 case lir_leal: | |
| 6532 case lir_instanceof: | |
| 6533 case lir_checkcast: | |
| 6534 case lir_store_check: inc_counter(counter_typecheck); break; | |
| 6535 | |
| 6536 case lir_fpop_raw: | |
| 6537 case lir_fxch: | |
| 6538 case lir_fld: inc_counter(counter_fpu_stack); break; | |
| 6539 | |
| 6540 case lir_nop: | |
| 6541 case lir_push: | |
| 6542 case lir_pop: | |
| 6543 case lir_convert: | |
| 6544 case lir_roundfp: | |
| 6545 case lir_cmove: inc_counter(counter_misc_inst); break; | |
| 6546 | |
| 6547 default: inc_counter(counter_other_inst); break; | |
| 6548 } | |
| 6549 } | |
| 6550 } | |
| 6551 | |
| 6552 if (has_xhandlers) { | |
| 6553 inc_counter(counter_exception_method); | |
| 6554 } | |
| 6555 } | |
| 6556 | |
| 6557 void LinearScanStatistic::compute(LinearScan* allocator, LinearScanStatistic &global_statistic) { | |
| 6558 if (CountLinearScan || TraceLinearScanLevel > 0) { | |
| 6559 | |
| 6560 LinearScanStatistic local_statistic = LinearScanStatistic(); | |
| 6561 | |
| 6562 local_statistic.collect(allocator); | |
| 6563 global_statistic.sum_up(local_statistic); | |
| 6564 | |
| 6565 if (TraceLinearScanLevel > 2) { | |
| 6566 local_statistic.print("current local statistic"); | |
| 6567 } | |
| 6568 } | |
| 6569 } | |
| 6570 | |
| 6571 | |
| 6572 // Implementation of LinearTimers | |
| 6573 | |
| 6574 LinearScanTimers::LinearScanTimers() { | |
| 6575 for (int i = 0; i < number_of_timers; i++) { | |
| 6576 timer(i)->reset(); | |
| 6577 } | |
| 6578 } | |
| 6579 | |
| 6580 const char* LinearScanTimers::timer_name(int idx) { | |
| 6581 switch (idx) { | |
| 6582 case timer_do_nothing: return "Nothing (Time Check)"; | |
| 6583 case timer_number_instructions: return "Number Instructions"; | |
| 6584 case timer_compute_local_live_sets: return "Local Live Sets"; | |
| 6585 case timer_compute_global_live_sets: return "Global Live Sets"; | |
| 6586 case timer_build_intervals: return "Build Intervals"; | |
| 6587 case timer_sort_intervals_before: return "Sort Intervals Before"; | |
| 6588 case timer_allocate_registers: return "Allocate Registers"; | |
| 6589 case timer_resolve_data_flow: return "Resolve Data Flow"; | |
| 6590 case timer_sort_intervals_after: return "Sort Intervals After"; | |
| 6591 case timer_eliminate_spill_moves: return "Spill optimization"; | |
| 6592 case timer_assign_reg_num: return "Assign Reg Num"; | |
| 6593 case timer_allocate_fpu_stack: return "Allocate FPU Stack"; | |
| 6594 case timer_optimize_lir: return "Optimize LIR"; | |
| 6595 default: ShouldNotReachHere(); return ""; | |
| 6596 } | |
| 6597 } | |
| 6598 | |
| 6599 void LinearScanTimers::begin_method() { | |
| 6600 if (TimeEachLinearScan) { | |
| 6601 // reset all timers to measure only current method | |
| 6602 for (int i = 0; i < number_of_timers; i++) { | |
| 6603 timer(i)->reset(); | |
| 6604 } | |
| 6605 } | |
| 6606 } | |
| 6607 | |
| 6608 void LinearScanTimers::end_method(LinearScan* allocator) { | |
| 6609 if (TimeEachLinearScan) { | |
| 6610 | |
| 6611 double c = timer(timer_do_nothing)->seconds(); | |
| 6612 double total = 0; | |
| 6613 for (int i = 1; i < number_of_timers; i++) { | |
| 6614 total += timer(i)->seconds() - c; | |
| 6615 } | |
| 6616 | |
| 6617 if (total >= 0.0005) { | |
| 6618 // print all information in one line for automatic processing | |
| 6619 tty->print("@"); allocator->compilation()->method()->print_name(); | |
| 6620 | |
| 6621 tty->print("@ %d ", allocator->compilation()->method()->code_size()); | |
| 6622 tty->print("@ %d ", allocator->block_at(allocator->block_count() - 1)->last_lir_instruction_id() / 2); | |
| 6623 tty->print("@ %d ", allocator->block_count()); | |
| 6624 tty->print("@ %d ", allocator->num_virtual_regs()); | |
| 6625 tty->print("@ %d ", allocator->interval_count()); | |
| 6626 tty->print("@ %d ", allocator->_num_calls); | |
| 6627 tty->print("@ %d ", allocator->num_loops()); | |
| 6628 | |
| 6629 tty->print("@ %6.6f ", total); | |
| 6630 for (int i = 1; i < number_of_timers; i++) { | |
| 6631 tty->print("@ %4.1f ", ((timer(i)->seconds() - c) / total) * 100); | |
| 6632 } | |
| 6633 tty->cr(); | |
| 6634 } | |
| 6635 } | |
| 6636 } | |
| 6637 | |
| 6638 void LinearScanTimers::print(double total_time) { | |
| 6639 if (TimeLinearScan) { | |
| 6640 // correction value: sum of dummy-timer that only measures the time that | |
| 6641 // is necesary to start and stop itself | |
| 6642 double c = timer(timer_do_nothing)->seconds(); | |
| 6643 | |
| 6644 for (int i = 0; i < number_of_timers; i++) { | |
| 6645 double t = timer(i)->seconds(); | |
| 6646 tty->print_cr(" %25s: %6.3f s (%4.1f%%) corrected: %6.3f s (%4.1f%%)", timer_name(i), t, (t / total_time) * 100.0, t - c, (t - c) / (total_time - 2 * number_of_timers * c) * 100); | |
| 6647 } | |
| 6648 } | |
| 6649 } | |
| 6650 | |
| 6651 #endif // #ifndef PRODUCT |