Mercurial > hg > truffle
annotate src/share/vm/oops/generateOopMap.cpp @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 8104 | 2 * Copyright (c) 1997, 2013, 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 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "interpreter/bytecodeStream.hpp" | |
| 27 #include "oops/generateOopMap.hpp" | |
| 28 #include "oops/oop.inline.hpp" | |
|
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29 #include "oops/symbol.hpp" |
| 1972 | 30 #include "runtime/handles.inline.hpp" |
| 31 #include "runtime/java.hpp" | |
| 32 #include "runtime/relocator.hpp" | |
| 33 #include "utilities/bitMap.inline.hpp" | |
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34 #include "prims/methodHandles.hpp" |
| 1972 | 35 |
| 0 | 36 // |
| 37 // | |
| 38 // Compute stack layouts for each instruction in method. | |
| 39 // | |
| 40 // Problems: | |
| 41 // - What to do about jsr with different types of local vars? | |
| 42 // Need maps that are conditional on jsr path? | |
| 43 // - Jsr and exceptions should be done more efficiently (the retAddr stuff) | |
| 44 // | |
| 45 // Alternative: | |
| 46 // - Could extend verifier to provide this information. | |
| 47 // For: one fewer abstract interpreter to maintain. Against: the verifier | |
| 48 // solves a bigger problem so slower (undesirable to force verification of | |
| 49 // everything?). | |
| 50 // | |
| 51 // Algorithm: | |
| 52 // Partition bytecodes into basic blocks | |
| 53 // For each basic block: store entry state (vars, stack). For instructions | |
| 54 // inside basic blocks we do not store any state (instead we recompute it | |
| 55 // from state produced by previous instruction). | |
| 56 // | |
| 57 // Perform abstract interpretation of bytecodes over this lattice: | |
| 58 // | |
| 59 // _--'#'--_ | |
| 60 // / / \ \ | |
| 61 // / / \ \ | |
| 62 // / | | \ | |
| 63 // 'r' 'v' 'p' ' ' | |
| 64 // \ | | / | |
| 65 // \ \ / / | |
| 66 // \ \ / / | |
| 67 // -- '@' -- | |
| 68 // | |
| 69 // '#' top, result of conflict merge | |
| 70 // 'r' reference type | |
| 71 // 'v' value type | |
| 72 // 'p' pc type for jsr/ret | |
| 73 // ' ' uninitialized; never occurs on operand stack in Java | |
| 74 // '@' bottom/unexecuted; initial state each bytecode. | |
| 75 // | |
| 76 // Basic block headers are the only merge points. We use this iteration to | |
| 77 // compute the information: | |
| 78 // | |
| 79 // find basic blocks; | |
| 80 // initialize them with uninitialized state; | |
| 81 // initialize first BB according to method signature; | |
| 82 // mark first BB changed | |
| 83 // while (some BB is changed) do { | |
| 84 // perform abstract interpration of all bytecodes in BB; | |
| 85 // merge exit state of BB into entry state of all successor BBs, | |
| 86 // noting if any of these change; | |
| 87 // } | |
| 88 // | |
| 89 // One additional complication is necessary. The jsr instruction pushes | |
| 90 // a return PC on the stack (a 'p' type in the abstract interpretation). | |
| 91 // To be able to process "ret" bytecodes, we keep track of these return | |
| 92 // PC's in a 'retAddrs' structure in abstract interpreter context (when | |
| 93 // processing a "ret" bytecodes, it is not sufficient to know that it gets | |
| 94 // an argument of the right type 'p'; we need to know which address it | |
| 95 // returns to). | |
| 96 // | |
| 97 // (Note this comment is borrowed form the original author of the algorithm) | |
| 98 | |
| 99 // ComputeCallStack | |
| 100 // | |
| 101 // Specialization of SignatureIterator - compute the effects of a call | |
| 102 // | |
| 103 class ComputeCallStack : public SignatureIterator { | |
| 104 CellTypeState *_effect; | |
| 105 int _idx; | |
| 106 | |
| 107 void setup(); | |
| 108 void set(CellTypeState state) { _effect[_idx++] = state; } | |
| 109 int length() { return _idx; }; | |
| 110 | |
| 111 virtual void do_bool () { set(CellTypeState::value); }; | |
| 112 virtual void do_char () { set(CellTypeState::value); }; | |
| 113 virtual void do_float () { set(CellTypeState::value); }; | |
| 114 virtual void do_byte () { set(CellTypeState::value); }; | |
| 115 virtual void do_short () { set(CellTypeState::value); }; | |
| 116 virtual void do_int () { set(CellTypeState::value); }; | |
| 117 virtual void do_void () { set(CellTypeState::bottom);}; | |
| 118 virtual void do_object(int begin, int end) { set(CellTypeState::ref); }; | |
| 119 virtual void do_array (int begin, int end) { set(CellTypeState::ref); }; | |
| 120 | |
| 121 void do_double() { set(CellTypeState::value); | |
| 122 set(CellTypeState::value); } | |
| 123 void do_long () { set(CellTypeState::value); | |
| 124 set(CellTypeState::value); } | |
| 125 | |
| 126 public: | |
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127 ComputeCallStack(Symbol* signature) : SignatureIterator(signature) {}; |
| 0 | 128 |
| 129 // Compute methods | |
| 130 int compute_for_parameters(bool is_static, CellTypeState *effect) { | |
| 131 _idx = 0; | |
| 132 _effect = effect; | |
| 133 | |
| 134 if (!is_static) | |
| 135 effect[_idx++] = CellTypeState::ref; | |
| 136 | |
| 137 iterate_parameters(); | |
| 138 | |
| 139 return length(); | |
| 140 }; | |
| 141 | |
| 142 int compute_for_returntype(CellTypeState *effect) { | |
| 143 _idx = 0; | |
| 144 _effect = effect; | |
| 145 iterate_returntype(); | |
| 146 set(CellTypeState::bottom); // Always terminate with a bottom state, so ppush works | |
| 147 | |
| 148 return length(); | |
| 149 } | |
| 150 }; | |
| 151 | |
| 152 //========================================================================================= | |
| 153 // ComputeEntryStack | |
| 154 // | |
| 155 // Specialization of SignatureIterator - in order to set up first stack frame | |
| 156 // | |
| 157 class ComputeEntryStack : public SignatureIterator { | |
| 158 CellTypeState *_effect; | |
| 159 int _idx; | |
| 160 | |
| 161 void setup(); | |
| 162 void set(CellTypeState state) { _effect[_idx++] = state; } | |
| 163 int length() { return _idx; }; | |
| 164 | |
| 165 virtual void do_bool () { set(CellTypeState::value); }; | |
| 166 virtual void do_char () { set(CellTypeState::value); }; | |
| 167 virtual void do_float () { set(CellTypeState::value); }; | |
| 168 virtual void do_byte () { set(CellTypeState::value); }; | |
| 169 virtual void do_short () { set(CellTypeState::value); }; | |
| 170 virtual void do_int () { set(CellTypeState::value); }; | |
| 171 virtual void do_void () { set(CellTypeState::bottom);}; | |
| 172 virtual void do_object(int begin, int end) { set(CellTypeState::make_slot_ref(_idx)); } | |
| 173 virtual void do_array (int begin, int end) { set(CellTypeState::make_slot_ref(_idx)); } | |
| 174 | |
| 175 void do_double() { set(CellTypeState::value); | |
| 176 set(CellTypeState::value); } | |
| 177 void do_long () { set(CellTypeState::value); | |
| 178 set(CellTypeState::value); } | |
| 179 | |
| 180 public: | |
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181 ComputeEntryStack(Symbol* signature) : SignatureIterator(signature) {}; |
| 0 | 182 |
| 183 // Compute methods | |
| 184 int compute_for_parameters(bool is_static, CellTypeState *effect) { | |
| 185 _idx = 0; | |
| 186 _effect = effect; | |
| 187 | |
| 188 if (!is_static) | |
| 189 effect[_idx++] = CellTypeState::make_slot_ref(0); | |
| 190 | |
| 191 iterate_parameters(); | |
| 192 | |
| 193 return length(); | |
| 194 }; | |
| 195 | |
| 196 int compute_for_returntype(CellTypeState *effect) { | |
| 197 _idx = 0; | |
| 198 _effect = effect; | |
| 199 iterate_returntype(); | |
| 200 set(CellTypeState::bottom); // Always terminate with a bottom state, so ppush works | |
| 201 | |
| 202 return length(); | |
| 203 } | |
| 204 }; | |
| 205 | |
| 206 //===================================================================================== | |
| 207 // | |
| 208 // Implementation of RetTable/RetTableEntry | |
| 209 // | |
| 210 // Contains function to itereate through all bytecodes | |
| 211 // and find all return entry points | |
| 212 // | |
| 213 int RetTable::_init_nof_entries = 10; | |
| 214 int RetTableEntry::_init_nof_jsrs = 5; | |
| 215 | |
| 216 void RetTableEntry::add_delta(int bci, int delta) { | |
| 217 if (_target_bci > bci) _target_bci += delta; | |
| 218 | |
| 219 for (int k = 0; k < _jsrs->length(); k++) { | |
| 220 int jsr = _jsrs->at(k); | |
| 221 if (jsr > bci) _jsrs->at_put(k, jsr+delta); | |
| 222 } | |
| 223 } | |
| 224 | |
| 225 void RetTable::compute_ret_table(methodHandle method) { | |
| 226 BytecodeStream i(method); | |
| 227 Bytecodes::Code bytecode; | |
| 228 | |
| 229 while( (bytecode = i.next()) >= 0) { | |
| 230 switch (bytecode) { | |
| 231 case Bytecodes::_jsr: | |
| 232 add_jsr(i.next_bci(), i.dest()); | |
| 233 break; | |
| 234 case Bytecodes::_jsr_w: | |
| 235 add_jsr(i.next_bci(), i.dest_w()); | |
| 236 break; | |
| 237 } | |
| 238 } | |
| 239 } | |
| 240 | |
| 241 void RetTable::add_jsr(int return_bci, int target_bci) { | |
| 242 RetTableEntry* entry = _first; | |
| 243 | |
| 244 // Scan table for entry | |
| 245 for (;entry && entry->target_bci() != target_bci; entry = entry->next()); | |
| 246 | |
| 247 if (!entry) { | |
| 248 // Allocate new entry and put in list | |
| 249 entry = new RetTableEntry(target_bci, _first); | |
| 250 _first = entry; | |
| 251 } | |
| 252 | |
| 253 // Now "entry" is set. Make sure that the entry is initialized | |
| 254 // and has room for the new jsr. | |
| 255 entry->add_jsr(return_bci); | |
| 256 } | |
| 257 | |
| 258 RetTableEntry* RetTable::find_jsrs_for_target(int targBci) { | |
| 259 RetTableEntry *cur = _first; | |
| 260 | |
| 261 while(cur) { | |
| 262 assert(cur->target_bci() != -1, "sanity check"); | |
| 263 if (cur->target_bci() == targBci) return cur; | |
| 264 cur = cur->next(); | |
| 265 } | |
| 266 ShouldNotReachHere(); | |
| 267 return NULL; | |
| 268 } | |
| 269 | |
| 270 // The instruction at bci is changing size by "delta". Update the return map. | |
| 271 void RetTable::update_ret_table(int bci, int delta) { | |
| 272 RetTableEntry *cur = _first; | |
| 273 while(cur) { | |
| 274 cur->add_delta(bci, delta); | |
| 275 cur = cur->next(); | |
| 276 } | |
| 277 } | |
| 278 | |
| 279 // | |
| 280 // Celltype state | |
| 281 // | |
| 282 | |
| 283 CellTypeState CellTypeState::bottom = CellTypeState::make_bottom(); | |
| 284 CellTypeState CellTypeState::uninit = CellTypeState::make_any(uninit_value); | |
| 285 CellTypeState CellTypeState::ref = CellTypeState::make_any(ref_conflict); | |
| 286 CellTypeState CellTypeState::value = CellTypeState::make_any(val_value); | |
| 287 CellTypeState CellTypeState::refUninit = CellTypeState::make_any(ref_conflict | uninit_value); | |
| 288 CellTypeState CellTypeState::top = CellTypeState::make_top(); | |
| 289 CellTypeState CellTypeState::addr = CellTypeState::make_any(addr_conflict); | |
| 290 | |
| 291 // Commonly used constants | |
| 292 static CellTypeState epsilonCTS[1] = { CellTypeState::bottom }; | |
| 293 static CellTypeState refCTS = CellTypeState::ref; | |
| 294 static CellTypeState valCTS = CellTypeState::value; | |
| 295 static CellTypeState vCTS[2] = { CellTypeState::value, CellTypeState::bottom }; | |
| 296 static CellTypeState rCTS[2] = { CellTypeState::ref, CellTypeState::bottom }; | |
| 297 static CellTypeState rrCTS[3] = { CellTypeState::ref, CellTypeState::ref, CellTypeState::bottom }; | |
| 298 static CellTypeState vrCTS[3] = { CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; | |
| 299 static CellTypeState vvCTS[3] = { CellTypeState::value, CellTypeState::value, CellTypeState::bottom }; | |
| 300 static CellTypeState rvrCTS[4] = { CellTypeState::ref, CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; | |
| 301 static CellTypeState vvrCTS[4] = { CellTypeState::value, CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; | |
| 302 static CellTypeState vvvCTS[4] = { CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::bottom }; | |
| 303 static CellTypeState vvvrCTS[5] = { CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; | |
| 304 static CellTypeState vvvvCTS[5] = { CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::bottom }; | |
| 305 | |
| 306 char CellTypeState::to_char() const { | |
| 307 if (can_be_reference()) { | |
| 308 if (can_be_value() || can_be_address()) | |
| 309 return '#'; // Conflict that needs to be rewritten | |
| 310 else | |
| 311 return 'r'; | |
| 312 } else if (can_be_value()) | |
| 313 return 'v'; | |
| 314 else if (can_be_address()) | |
| 315 return 'p'; | |
| 316 else if (can_be_uninit()) | |
| 317 return ' '; | |
| 318 else | |
| 319 return '@'; | |
| 320 } | |
| 321 | |
| 322 | |
| 323 // Print a detailed CellTypeState. Indicate all bits that are set. If | |
| 324 // the CellTypeState represents an address or a reference, print the | |
| 325 // value of the additional information. | |
| 326 void CellTypeState::print(outputStream *os) { | |
| 327 if (can_be_address()) { | |
| 328 os->print("(p"); | |
| 329 } else { | |
| 330 os->print("( "); | |
| 331 } | |
| 332 if (can_be_reference()) { | |
| 333 os->print("r"); | |
| 334 } else { | |
| 335 os->print(" "); | |
| 336 } | |
| 337 if (can_be_value()) { | |
| 338 os->print("v"); | |
| 339 } else { | |
| 340 os->print(" "); | |
| 341 } | |
| 342 if (can_be_uninit()) { | |
| 343 os->print("u|"); | |
| 344 } else { | |
| 345 os->print(" |"); | |
| 346 } | |
| 347 if (is_info_top()) { | |
| 348 os->print("Top)"); | |
| 349 } else if (is_info_bottom()) { | |
| 350 os->print("Bot)"); | |
| 351 } else { | |
| 352 if (is_reference()) { | |
| 353 int info = get_info(); | |
| 354 int data = info & ~(ref_not_lock_bit | ref_slot_bit); | |
| 355 if (info & ref_not_lock_bit) { | |
| 356 // Not a monitor lock reference. | |
| 357 if (info & ref_slot_bit) { | |
| 358 // slot | |
| 359 os->print("slot%d)", data); | |
| 360 } else { | |
| 361 // line | |
| 362 os->print("line%d)", data); | |
| 363 } | |
| 364 } else { | |
| 365 // lock | |
| 366 os->print("lock%d)", data); | |
| 367 } | |
| 368 } else { | |
| 369 os->print("%d)", get_info()); | |
| 370 } | |
| 371 } | |
| 372 } | |
| 373 | |
| 374 // | |
| 375 // Basicblock handling methods | |
| 376 // | |
| 377 | |
| 378 void GenerateOopMap ::initialize_bb() { | |
| 379 _gc_points = 0; | |
| 380 _bb_count = 0; | |
| 342 | 381 _bb_hdr_bits.clear(); |
| 382 _bb_hdr_bits.resize(method()->code_size()); | |
| 0 | 383 } |
| 384 | |
| 385 void GenerateOopMap::bb_mark_fct(GenerateOopMap *c, int bci, int *data) { | |
| 386 assert(bci>= 0 && bci < c->method()->code_size(), "index out of bounds"); | |
| 387 if (c->is_bb_header(bci)) | |
| 388 return; | |
| 389 | |
| 390 if (TraceNewOopMapGeneration) { | |
| 391 tty->print_cr("Basicblock#%d begins at: %d", c->_bb_count, bci); | |
| 392 } | |
| 393 c->set_bbmark_bit(bci); | |
| 394 c->_bb_count++; | |
| 395 } | |
| 396 | |
| 397 | |
| 398 void GenerateOopMap::mark_bbheaders_and_count_gc_points() { | |
| 399 initialize_bb(); | |
| 400 | |
| 401 bool fellThrough = false; // False to get first BB marked. | |
| 402 | |
| 403 // First mark all exception handlers as start of a basic-block | |
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404 ExceptionTable excps(method()); |
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405 for(int i = 0; i < excps.length(); i ++) { |
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406 bb_mark_fct(this, excps.handler_pc(i), NULL); |
| 0 | 407 } |
| 408 | |
| 409 // Then iterate through the code | |
| 410 BytecodeStream bcs(_method); | |
| 411 Bytecodes::Code bytecode; | |
| 412 | |
| 413 while( (bytecode = bcs.next()) >= 0) { | |
| 414 int bci = bcs.bci(); | |
| 415 | |
| 416 if (!fellThrough) | |
| 417 bb_mark_fct(this, bci, NULL); | |
| 418 | |
| 419 fellThrough = jump_targets_do(&bcs, &GenerateOopMap::bb_mark_fct, NULL); | |
| 420 | |
| 421 /* We will also mark successors of jsr's as basic block headers. */ | |
| 422 switch (bytecode) { | |
| 423 case Bytecodes::_jsr: | |
| 424 assert(!fellThrough, "should not happen"); | |
| 425 bb_mark_fct(this, bci + Bytecodes::length_for(bytecode), NULL); | |
| 426 break; | |
| 427 case Bytecodes::_jsr_w: | |
| 428 assert(!fellThrough, "should not happen"); | |
| 429 bb_mark_fct(this, bci + Bytecodes::length_for(bytecode), NULL); | |
| 430 break; | |
| 431 } | |
| 432 | |
| 433 if (possible_gc_point(&bcs)) | |
| 434 _gc_points++; | |
| 435 } | |
| 436 } | |
| 437 | |
| 438 void GenerateOopMap::reachable_basicblock(GenerateOopMap *c, int bci, int *data) { | |
| 439 assert(bci>= 0 && bci < c->method()->code_size(), "index out of bounds"); | |
| 440 BasicBlock* bb = c->get_basic_block_at(bci); | |
| 441 if (bb->is_dead()) { | |
| 442 bb->mark_as_alive(); | |
| 443 *data = 1; // Mark basicblock as changed | |
| 444 } | |
| 445 } | |
| 446 | |
| 447 | |
| 448 void GenerateOopMap::mark_reachable_code() { | |
| 449 int change = 1; // int to get function pointers to work | |
| 450 | |
| 451 // Mark entry basic block as alive and all exception handlers | |
| 452 _basic_blocks[0].mark_as_alive(); | |
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453 ExceptionTable excps(method()); |
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454 for(int i = 0; i < excps.length(); i++) { |
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455 BasicBlock *bb = get_basic_block_at(excps.handler_pc(i)); |
| 0 | 456 // If block is not already alive (due to multiple exception handlers to same bb), then |
| 457 // make it alive | |
| 458 if (bb->is_dead()) bb->mark_as_alive(); | |
| 459 } | |
| 460 | |
| 461 BytecodeStream bcs(_method); | |
| 462 | |
| 463 // Iterate through all basic blocks until we reach a fixpoint | |
| 464 while (change) { | |
| 465 change = 0; | |
| 466 | |
| 467 for (int i = 0; i < _bb_count; i++) { | |
| 468 BasicBlock *bb = &_basic_blocks[i]; | |
| 469 if (bb->is_alive()) { | |
| 470 // Position bytecodestream at last bytecode in basicblock | |
| 471 bcs.set_start(bb->_end_bci); | |
| 472 bcs.next(); | |
| 473 Bytecodes::Code bytecode = bcs.code(); | |
| 474 int bci = bcs.bci(); | |
| 475 assert(bci == bb->_end_bci, "wrong bci"); | |
| 476 | |
| 477 bool fell_through = jump_targets_do(&bcs, &GenerateOopMap::reachable_basicblock, &change); | |
| 478 | |
| 479 // We will also mark successors of jsr's as alive. | |
| 480 switch (bytecode) { | |
| 481 case Bytecodes::_jsr: | |
| 482 case Bytecodes::_jsr_w: | |
| 483 assert(!fell_through, "should not happen"); | |
| 484 reachable_basicblock(this, bci + Bytecodes::length_for(bytecode), &change); | |
| 485 break; | |
| 486 } | |
| 487 if (fell_through) { | |
| 488 // Mark successor as alive | |
| 489 if (bb[1].is_dead()) { | |
| 490 bb[1].mark_as_alive(); | |
| 491 change = 1; | |
| 492 } | |
| 493 } | |
| 494 } | |
| 495 } | |
| 496 } | |
| 497 } | |
| 498 | |
| 499 /* If the current instruction in "c" has no effect on control flow, | |
| 500 returns "true". Otherwise, calls "jmpFct" one or more times, with | |
| 501 "c", an appropriate "pcDelta", and "data" as arguments, then | |
| 502 returns "false". There is one exception: if the current | |
| 503 instruction is a "ret", returns "false" without calling "jmpFct". | |
| 504 Arrangements for tracking the control flow of a "ret" must be made | |
| 505 externally. */ | |
| 506 bool GenerateOopMap::jump_targets_do(BytecodeStream *bcs, jmpFct_t jmpFct, int *data) { | |
| 507 int bci = bcs->bci(); | |
| 508 | |
| 509 switch (bcs->code()) { | |
| 510 case Bytecodes::_ifeq: | |
| 511 case Bytecodes::_ifne: | |
| 512 case Bytecodes::_iflt: | |
| 513 case Bytecodes::_ifge: | |
| 514 case Bytecodes::_ifgt: | |
| 515 case Bytecodes::_ifle: | |
| 516 case Bytecodes::_if_icmpeq: | |
| 517 case Bytecodes::_if_icmpne: | |
| 518 case Bytecodes::_if_icmplt: | |
| 519 case Bytecodes::_if_icmpge: | |
| 520 case Bytecodes::_if_icmpgt: | |
| 521 case Bytecodes::_if_icmple: | |
| 522 case Bytecodes::_if_acmpeq: | |
| 523 case Bytecodes::_if_acmpne: | |
| 524 case Bytecodes::_ifnull: | |
| 525 case Bytecodes::_ifnonnull: | |
| 526 (*jmpFct)(this, bcs->dest(), data); | |
| 527 (*jmpFct)(this, bci + 3, data); | |
| 528 break; | |
| 529 | |
| 530 case Bytecodes::_goto: | |
| 531 (*jmpFct)(this, bcs->dest(), data); | |
| 532 break; | |
| 533 case Bytecodes::_goto_w: | |
| 534 (*jmpFct)(this, bcs->dest_w(), data); | |
| 535 break; | |
| 536 case Bytecodes::_tableswitch: | |
| 2142 | 537 { Bytecode_tableswitch tableswitch(method(), bcs->bcp()); |
| 538 int len = tableswitch.length(); | |
| 0 | 539 |
| 2142 | 540 (*jmpFct)(this, bci + tableswitch.default_offset(), data); /* Default. jump address */ |
| 0 | 541 while (--len >= 0) { |
| 2142 | 542 (*jmpFct)(this, bci + tableswitch.dest_offset_at(len), data); |
| 0 | 543 } |
| 544 break; | |
| 545 } | |
| 546 | |
| 547 case Bytecodes::_lookupswitch: | |
| 2142 | 548 { Bytecode_lookupswitch lookupswitch(method(), bcs->bcp()); |
| 549 int npairs = lookupswitch.number_of_pairs(); | |
| 550 (*jmpFct)(this, bci + lookupswitch.default_offset(), data); /* Default. */ | |
| 0 | 551 while(--npairs >= 0) { |
| 2142 | 552 LookupswitchPair pair = lookupswitch.pair_at(npairs); |
| 553 (*jmpFct)(this, bci + pair.offset(), data); | |
| 0 | 554 } |
| 555 break; | |
| 556 } | |
| 557 case Bytecodes::_jsr: | |
| 558 assert(bcs->is_wide()==false, "sanity check"); | |
| 559 (*jmpFct)(this, bcs->dest(), data); | |
| 560 | |
| 561 | |
| 562 | |
| 563 break; | |
| 564 case Bytecodes::_jsr_w: | |
| 565 (*jmpFct)(this, bcs->dest_w(), data); | |
| 566 break; | |
| 567 case Bytecodes::_wide: | |
| 568 ShouldNotReachHere(); | |
| 569 return true; | |
| 570 break; | |
| 571 case Bytecodes::_athrow: | |
| 572 case Bytecodes::_ireturn: | |
| 573 case Bytecodes::_lreturn: | |
| 574 case Bytecodes::_freturn: | |
| 575 case Bytecodes::_dreturn: | |
| 576 case Bytecodes::_areturn: | |
| 577 case Bytecodes::_return: | |
| 578 case Bytecodes::_ret: | |
| 579 break; | |
| 580 default: | |
| 581 return true; | |
| 582 } | |
| 583 return false; | |
| 584 } | |
| 585 | |
| 586 /* Requires "pc" to be the head of a basic block; returns that basic | |
| 587 block. */ | |
| 588 BasicBlock *GenerateOopMap::get_basic_block_at(int bci) const { | |
| 589 BasicBlock* bb = get_basic_block_containing(bci); | |
| 590 assert(bb->_bci == bci, "should have found BB"); | |
| 591 return bb; | |
| 592 } | |
| 593 | |
| 594 // Requires "pc" to be the start of an instruction; returns the basic | |
| 595 // block containing that instruction. */ | |
| 596 BasicBlock *GenerateOopMap::get_basic_block_containing(int bci) const { | |
| 597 BasicBlock *bbs = _basic_blocks; | |
| 598 int lo = 0, hi = _bb_count - 1; | |
| 599 | |
| 600 while (lo <= hi) { | |
| 601 int m = (lo + hi) / 2; | |
| 602 int mbci = bbs[m]._bci; | |
| 603 int nbci; | |
| 604 | |
| 605 if ( m == _bb_count-1) { | |
| 606 assert( bci >= mbci && bci < method()->code_size(), "sanity check failed"); | |
| 607 return bbs+m; | |
| 608 } else { | |
| 609 nbci = bbs[m+1]._bci; | |
| 610 } | |
| 611 | |
| 612 if ( mbci <= bci && bci < nbci) { | |
| 613 return bbs+m; | |
| 614 } else if (mbci < bci) { | |
| 615 lo = m + 1; | |
| 616 } else { | |
| 617 assert(mbci > bci, "sanity check"); | |
| 618 hi = m - 1; | |
| 619 } | |
| 620 } | |
| 621 | |
| 622 fatal("should have found BB"); | |
| 623 return NULL; | |
| 624 } | |
| 625 | |
| 626 void GenerateOopMap::restore_state(BasicBlock *bb) | |
| 627 { | |
| 628 memcpy(_state, bb->_state, _state_len*sizeof(CellTypeState)); | |
| 629 _stack_top = bb->_stack_top; | |
| 630 _monitor_top = bb->_monitor_top; | |
| 631 } | |
| 632 | |
| 633 int GenerateOopMap::next_bb_start_pc(BasicBlock *bb) { | |
| 634 int bbNum = bb - _basic_blocks + 1; | |
| 635 if (bbNum == _bb_count) | |
| 636 return method()->code_size(); | |
| 637 | |
| 638 return _basic_blocks[bbNum]._bci; | |
| 639 } | |
| 640 | |
| 641 // | |
| 642 // CellType handling methods | |
| 643 // | |
| 644 | |
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645 // Allocate memory and throw LinkageError if failure. |
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646 #define ALLOC_RESOURCE_ARRAY(var, type, count) \ |
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647 var = NEW_RESOURCE_ARRAY_RETURN_NULL(type, count); \ |
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648 if (var == NULL) { \ |
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649 report_error("Cannot reserve enough memory to analyze this method"); \ |
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650 return; \ |
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651 } |
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652 |
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653 |
| 0 | 654 void GenerateOopMap::init_state() { |
| 655 _state_len = _max_locals + _max_stack + _max_monitors; | |
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656 ALLOC_RESOURCE_ARRAY(_state, CellTypeState, _state_len); |
| 0 | 657 memset(_state, 0, _state_len * sizeof(CellTypeState)); |
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658 int count = MAX3(_max_locals, _max_stack, _max_monitors) + 1/*for null terminator char */; |
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659 ALLOC_RESOURCE_ARRAY(_state_vec_buf, char, count); |
| 0 | 660 } |
| 661 | |
| 662 void GenerateOopMap::make_context_uninitialized() { | |
| 663 CellTypeState* vs = vars(); | |
| 664 | |
| 665 for (int i = 0; i < _max_locals; i++) | |
| 666 vs[i] = CellTypeState::uninit; | |
| 667 | |
| 668 _stack_top = 0; | |
| 669 _monitor_top = 0; | |
| 670 } | |
| 671 | |
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672 int GenerateOopMap::methodsig_to_effect(Symbol* signature, bool is_static, CellTypeState* effect) { |
| 0 | 673 ComputeEntryStack ces(signature); |
| 674 return ces.compute_for_parameters(is_static, effect); | |
| 675 } | |
| 676 | |
| 677 // Return result of merging cts1 and cts2. | |
| 678 CellTypeState CellTypeState::merge(CellTypeState cts, int slot) const { | |
| 679 CellTypeState result; | |
| 680 | |
| 681 assert(!is_bottom() && !cts.is_bottom(), | |
| 682 "merge of bottom values is handled elsewhere"); | |
| 683 | |
| 684 result._state = _state | cts._state; | |
| 685 | |
| 686 // If the top bit is set, we don't need to do any more work. | |
| 687 if (!result.is_info_top()) { | |
| 688 assert((result.can_be_address() || result.can_be_reference()), | |
| 689 "only addresses and references have non-top info"); | |
| 690 | |
| 691 if (!equal(cts)) { | |
| 692 // The two values being merged are different. Raise to top. | |
| 693 if (result.is_reference()) { | |
| 694 result = CellTypeState::make_slot_ref(slot); | |
| 695 } else { | |
| 696 result._state |= info_conflict; | |
| 697 } | |
| 698 } | |
| 699 } | |
| 700 assert(result.is_valid_state(), "checking that CTS merge maintains legal state"); | |
| 701 | |
| 702 return result; | |
| 703 } | |
| 704 | |
| 705 // Merge the variable state for locals and stack from cts into bbts. | |
| 706 bool GenerateOopMap::merge_local_state_vectors(CellTypeState* cts, | |
| 707 CellTypeState* bbts) { | |
| 708 int i; | |
| 709 int len = _max_locals + _stack_top; | |
| 710 bool change = false; | |
| 711 | |
| 712 for (i = len - 1; i >= 0; i--) { | |
| 713 CellTypeState v = cts[i].merge(bbts[i], i); | |
| 714 change = change || !v.equal(bbts[i]); | |
| 715 bbts[i] = v; | |
| 716 } | |
| 717 | |
| 718 return change; | |
| 719 } | |
| 720 | |
| 721 // Merge the monitor stack state from cts into bbts. | |
| 722 bool GenerateOopMap::merge_monitor_state_vectors(CellTypeState* cts, | |
| 723 CellTypeState* bbts) { | |
| 724 bool change = false; | |
| 725 if (_max_monitors > 0 && _monitor_top != bad_monitors) { | |
| 726 // If there are no monitors in the program, or there has been | |
| 727 // a monitor matching error before this point in the program, | |
| 728 // then we do not merge in the monitor state. | |
| 729 | |
| 730 int base = _max_locals + _max_stack; | |
| 731 int len = base + _monitor_top; | |
| 732 for (int i = len - 1; i >= base; i--) { | |
| 733 CellTypeState v = cts[i].merge(bbts[i], i); | |
| 734 | |
| 735 // Can we prove that, when there has been a change, it will already | |
| 736 // have been detected at this point? That would make this equal | |
| 737 // check here unnecessary. | |
| 738 change = change || !v.equal(bbts[i]); | |
| 739 bbts[i] = v; | |
| 740 } | |
| 741 } | |
| 742 | |
| 743 return change; | |
| 744 } | |
| 745 | |
| 746 void GenerateOopMap::copy_state(CellTypeState *dst, CellTypeState *src) { | |
| 747 int len = _max_locals + _stack_top; | |
| 748 for (int i = 0; i < len; i++) { | |
| 749 if (src[i].is_nonlock_reference()) { | |
| 750 dst[i] = CellTypeState::make_slot_ref(i); | |
| 751 } else { | |
| 752 dst[i] = src[i]; | |
| 753 } | |
| 754 } | |
| 755 if (_max_monitors > 0 && _monitor_top != bad_monitors) { | |
| 756 int base = _max_locals + _max_stack; | |
| 757 len = base + _monitor_top; | |
| 758 for (int i = base; i < len; i++) { | |
| 759 dst[i] = src[i]; | |
| 760 } | |
| 761 } | |
| 762 } | |
| 763 | |
| 764 | |
| 765 // Merge the states for the current block and the next. As long as a | |
| 766 // block is reachable the locals and stack must be merged. If the | |
| 767 // stack heights don't match then this is a verification error and | |
| 768 // it's impossible to interpret the code. Simultaneously monitor | |
| 769 // states are being check to see if they nest statically. If monitor | |
| 770 // depths match up then their states are merged. Otherwise the | |
| 771 // mismatch is simply recorded and interpretation continues since | |
| 772 // monitor matching is purely informational and doesn't say anything | |
| 773 // about the correctness of the code. | |
| 774 void GenerateOopMap::merge_state_into_bb(BasicBlock *bb) { | |
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775 guarantee(bb != NULL, "null basicblock"); |
| 0 | 776 assert(bb->is_alive(), "merging state into a dead basicblock"); |
| 777 | |
| 778 if (_stack_top == bb->_stack_top) { | |
| 779 // always merge local state even if monitors don't match. | |
| 780 if (merge_local_state_vectors(_state, bb->_state)) { | |
| 781 bb->set_changed(true); | |
| 782 } | |
| 783 if (_monitor_top == bb->_monitor_top) { | |
| 784 // monitors still match so continue merging monitor states. | |
| 785 if (merge_monitor_state_vectors(_state, bb->_state)) { | |
| 786 bb->set_changed(true); | |
| 787 } | |
| 788 } else { | |
| 789 if (TraceMonitorMismatch) { | |
| 790 report_monitor_mismatch("monitor stack height merge conflict"); | |
| 791 } | |
| 792 // When the monitor stacks are not matched, we set _monitor_top to | |
| 793 // bad_monitors. This signals that, from here on, the monitor stack cannot | |
| 794 // be trusted. In particular, monitorexit bytecodes may throw | |
| 795 // exceptions. We mark this block as changed so that the change | |
| 796 // propagates properly. | |
| 797 bb->_monitor_top = bad_monitors; | |
| 798 bb->set_changed(true); | |
| 799 _monitor_safe = false; | |
| 800 } | |
| 801 } else if (!bb->is_reachable()) { | |
| 802 // First time we look at this BB | |
| 803 copy_state(bb->_state, _state); | |
| 804 bb->_stack_top = _stack_top; | |
| 805 bb->_monitor_top = _monitor_top; | |
| 806 bb->set_changed(true); | |
| 807 } else { | |
| 808 verify_error("stack height conflict: %d vs. %d", _stack_top, bb->_stack_top); | |
| 809 } | |
| 810 } | |
| 811 | |
| 812 void GenerateOopMap::merge_state(GenerateOopMap *gom, int bci, int* data) { | |
| 813 gom->merge_state_into_bb(gom->get_basic_block_at(bci)); | |
| 814 } | |
| 815 | |
| 816 void GenerateOopMap::set_var(int localNo, CellTypeState cts) { | |
| 817 assert(cts.is_reference() || cts.is_value() || cts.is_address(), | |
| 818 "wrong celltypestate"); | |
| 819 if (localNo < 0 || localNo > _max_locals) { | |
| 820 verify_error("variable write error: r%d", localNo); | |
| 821 return; | |
| 822 } | |
| 823 vars()[localNo] = cts; | |
| 824 } | |
| 825 | |
| 826 CellTypeState GenerateOopMap::get_var(int localNo) { | |
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827 assert(localNo < _max_locals + _nof_refval_conflicts, "variable read error"); |
| 0 | 828 if (localNo < 0 || localNo > _max_locals) { |
| 829 verify_error("variable read error: r%d", localNo); | |
| 830 return valCTS; // just to pick something; | |
| 831 } | |
| 832 return vars()[localNo]; | |
| 833 } | |
| 834 | |
| 835 CellTypeState GenerateOopMap::pop() { | |
| 836 if ( _stack_top <= 0) { | |
| 837 verify_error("stack underflow"); | |
| 838 return valCTS; // just to pick something | |
| 839 } | |
| 840 return stack()[--_stack_top]; | |
| 841 } | |
| 842 | |
| 843 void GenerateOopMap::push(CellTypeState cts) { | |
| 844 if ( _stack_top >= _max_stack) { | |
| 845 verify_error("stack overflow"); | |
| 846 return; | |
| 847 } | |
| 848 stack()[_stack_top++] = cts; | |
| 849 } | |
| 850 | |
| 851 CellTypeState GenerateOopMap::monitor_pop() { | |
| 852 assert(_monitor_top != bad_monitors, "monitor_pop called on error monitor stack"); | |
| 853 if (_monitor_top == 0) { | |
| 854 // We have detected a pop of an empty monitor stack. | |
| 855 _monitor_safe = false; | |
| 856 _monitor_top = bad_monitors; | |
| 857 | |
| 858 if (TraceMonitorMismatch) { | |
| 859 report_monitor_mismatch("monitor stack underflow"); | |
| 860 } | |
| 861 return CellTypeState::ref; // just to keep the analysis going. | |
| 862 } | |
| 863 return monitors()[--_monitor_top]; | |
| 864 } | |
| 865 | |
| 866 void GenerateOopMap::monitor_push(CellTypeState cts) { | |
| 867 assert(_monitor_top != bad_monitors, "monitor_push called on error monitor stack"); | |
| 868 if (_monitor_top >= _max_monitors) { | |
| 869 // Some monitorenter is being executed more than once. | |
| 870 // This means that the monitor stack cannot be simulated. | |
| 871 _monitor_safe = false; | |
| 872 _monitor_top = bad_monitors; | |
| 873 | |
| 874 if (TraceMonitorMismatch) { | |
| 875 report_monitor_mismatch("monitor stack overflow"); | |
| 876 } | |
| 877 return; | |
| 878 } | |
| 879 monitors()[_monitor_top++] = cts; | |
| 880 } | |
| 881 | |
| 882 // | |
| 883 // Interpretation handling methods | |
| 884 // | |
| 885 | |
| 886 void GenerateOopMap::do_interpretation() | |
| 887 { | |
| 888 // "i" is just for debugging, so we can detect cases where this loop is | |
| 889 // iterated more than once. | |
| 890 int i = 0; | |
| 891 do { | |
| 892 #ifndef PRODUCT | |
| 893 if (TraceNewOopMapGeneration) { | |
| 894 tty->print("\n\nIteration #%d of do_interpretation loop, method:\n", i); | |
| 895 method()->print_name(tty); | |
| 896 tty->print("\n\n"); | |
| 897 } | |
| 898 #endif | |
| 899 _conflict = false; | |
| 900 _monitor_safe = true; | |
| 901 // init_state is now called from init_basic_blocks. The length of a | |
| 902 // state vector cannot be determined until we have made a pass through | |
| 903 // the bytecodes counting the possible monitor entries. | |
| 904 if (!_got_error) init_basic_blocks(); | |
| 905 if (!_got_error) setup_method_entry_state(); | |
| 906 if (!_got_error) interp_all(); | |
| 907 if (!_got_error) rewrite_refval_conflicts(); | |
| 908 i++; | |
| 909 } while (_conflict && !_got_error); | |
| 910 } | |
| 911 | |
| 912 void GenerateOopMap::init_basic_blocks() { | |
| 913 // Note: Could consider reserving only the needed space for each BB's state | |
| 914 // (entry stack may not be of maximal height for every basic block). | |
| 915 // But cumbersome since we don't know the stack heights yet. (Nor the | |
| 916 // monitor stack heights...) | |
| 917 | |
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918 ALLOC_RESOURCE_ARRAY(_basic_blocks, BasicBlock, _bb_count); |
| 0 | 919 |
| 920 // Make a pass through the bytecodes. Count the number of monitorenters. | |
| 921 // This can be used an upper bound on the monitor stack depth in programs | |
| 922 // which obey stack discipline with their monitor usage. Initialize the | |
| 923 // known information about basic blocks. | |
| 924 BytecodeStream j(_method); | |
| 925 Bytecodes::Code bytecode; | |
| 926 | |
| 927 int bbNo = 0; | |
| 928 int monitor_count = 0; | |
| 929 int prev_bci = -1; | |
| 930 while( (bytecode = j.next()) >= 0) { | |
| 931 if (j.code() == Bytecodes::_monitorenter) { | |
| 932 monitor_count++; | |
| 933 } | |
| 934 | |
| 935 int bci = j.bci(); | |
| 936 if (is_bb_header(bci)) { | |
| 937 // Initialize the basicblock structure | |
| 938 BasicBlock *bb = _basic_blocks + bbNo; | |
| 939 bb->_bci = bci; | |
| 940 bb->_max_locals = _max_locals; | |
| 941 bb->_max_stack = _max_stack; | |
| 942 bb->set_changed(false); | |
| 943 bb->_stack_top = BasicBlock::_dead_basic_block; // Initialize all basicblocks are dead. | |
| 944 bb->_monitor_top = bad_monitors; | |
| 945 | |
| 946 if (bbNo > 0) { | |
| 947 _basic_blocks[bbNo - 1]._end_bci = prev_bci; | |
| 948 } | |
| 949 | |
| 950 bbNo++; | |
| 951 } | |
| 952 // Remember prevous bci. | |
| 953 prev_bci = bci; | |
| 954 } | |
| 955 // Set | |
| 956 _basic_blocks[bbNo-1]._end_bci = prev_bci; | |
| 957 | |
| 958 | |
| 342 | 959 // Check that the correct number of basicblocks was found |
| 960 if (bbNo !=_bb_count) { | |
| 961 if (bbNo < _bb_count) { | |
| 962 verify_error("jump into the middle of instruction?"); | |
| 963 return; | |
| 964 } else { | |
| 965 verify_error("extra basic blocks - should not happen?"); | |
| 966 return; | |
| 967 } | |
| 968 } | |
| 969 | |
| 0 | 970 _max_monitors = monitor_count; |
| 971 | |
| 972 // Now that we have a bound on the depth of the monitor stack, we can | |
| 973 // initialize the CellTypeState-related information. | |
| 974 init_state(); | |
| 975 | |
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977 // chunk. Then in the next part of the code, we set a pointer in each |
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978 // _basic_block that points to each piece. |
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979 |
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980 // The product of bbNo and _state_len can get large if there are lots of |
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981 // basic blocks and stack/locals/monitors. Need to check to make sure |
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982 // we don't overflow the capacity of a pointer. |
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983 if ((unsigned)bbNo > UINTPTR_MAX / sizeof(CellTypeState) / _state_len) { |
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984 report_error("The amount of memory required to analyze this method " |
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985 "exceeds addressable range"); |
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986 return; |
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987 } |
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988 |
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989 CellTypeState *basicBlockState; |
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990 ALLOC_RESOURCE_ARRAY(basicBlockState, CellTypeState, bbNo * _state_len); |
| 0 | 991 memset(basicBlockState, 0, bbNo * _state_len * sizeof(CellTypeState)); |
| 992 | |
| 993 // Make a pass over the basicblocks and assign their state vectors. | |
| 994 for (int blockNum=0; blockNum < bbNo; blockNum++) { | |
| 995 BasicBlock *bb = _basic_blocks + blockNum; | |
| 996 bb->_state = basicBlockState + blockNum * _state_len; | |
| 997 | |
| 998 #ifdef ASSERT | |
| 999 if (blockNum + 1 < bbNo) { | |
| 1000 address bcp = _method->bcp_from(bb->_end_bci); | |
| 2142 | 1001 int bc_len = Bytecodes::java_length_at(_method(), bcp); |
| 0 | 1002 assert(bb->_end_bci + bc_len == bb[1]._bci, "unmatched bci info in basicblock"); |
| 1003 } | |
| 1004 #endif | |
| 1005 } | |
| 1006 #ifdef ASSERT | |
| 1007 { BasicBlock *bb = &_basic_blocks[bbNo-1]; | |
| 1008 address bcp = _method->bcp_from(bb->_end_bci); | |
| 2142 | 1009 int bc_len = Bytecodes::java_length_at(_method(), bcp); |
| 0 | 1010 assert(bb->_end_bci + bc_len == _method->code_size(), "wrong end bci"); |
| 1011 } | |
| 1012 #endif | |
| 1013 | |
| 1014 // Mark all alive blocks | |
| 1015 mark_reachable_code(); | |
| 1016 } | |
| 1017 | |
| 1018 void GenerateOopMap::setup_method_entry_state() { | |
| 1019 | |
| 1020 // Initialize all locals to 'uninit' and set stack-height to 0 | |
| 1021 make_context_uninitialized(); | |
| 1022 | |
| 1023 // Initialize CellState type of arguments | |
| 1024 methodsig_to_effect(method()->signature(), method()->is_static(), vars()); | |
| 1025 | |
| 1026 // If some references must be pre-assigned to null, then set that up | |
| 1027 initialize_vars(); | |
| 1028 | |
| 1029 // This is the start state | |
| 1030 merge_state_into_bb(&_basic_blocks[0]); | |
| 1031 | |
| 1032 assert(_basic_blocks[0].changed(), "we are not getting off the ground"); | |
| 1033 } | |
| 1034 | |
| 1035 // The instruction at bci is changing size by "delta". Update the basic blocks. | |
| 1036 void GenerateOopMap::update_basic_blocks(int bci, int delta, | |
| 1037 int new_method_size) { | |
| 1038 assert(new_method_size >= method()->code_size() + delta, | |
| 1039 "new method size is too small"); | |
| 1040 | |
| 342 | 1041 BitMap::bm_word_t* new_bb_hdr_bits = |
| 1042 NEW_RESOURCE_ARRAY(BitMap::bm_word_t, | |
| 1043 BitMap::word_align_up(new_method_size)); | |
| 1044 _bb_hdr_bits.set_map(new_bb_hdr_bits); | |
| 1045 _bb_hdr_bits.set_size(new_method_size); | |
| 1046 _bb_hdr_bits.clear(); | |
| 0 | 1047 |
| 1048 | |
| 1049 for(int k = 0; k < _bb_count; k++) { | |
| 1050 if (_basic_blocks[k]._bci > bci) { | |
| 1051 _basic_blocks[k]._bci += delta; | |
| 1052 _basic_blocks[k]._end_bci += delta; | |
| 1053 } | |
| 342 | 1054 _bb_hdr_bits.at_put(_basic_blocks[k]._bci, true); |
| 0 | 1055 } |
| 1056 } | |
| 1057 | |
| 1058 // | |
| 1059 // Initvars handling | |
| 1060 // | |
| 1061 | |
| 1062 void GenerateOopMap::initialize_vars() { | |
| 1063 for (int k = 0; k < _init_vars->length(); k++) | |
| 1064 _state[_init_vars->at(k)] = CellTypeState::make_slot_ref(k); | |
| 1065 } | |
| 1066 | |
| 1067 void GenerateOopMap::add_to_ref_init_set(int localNo) { | |
| 1068 | |
| 1069 if (TraceNewOopMapGeneration) | |
| 1070 tty->print_cr("Added init vars: %d", localNo); | |
| 1071 | |
| 1072 // Is it already in the set? | |
| 1073 if (_init_vars->contains(localNo) ) | |
| 1074 return; | |
| 1075 | |
| 1076 _init_vars->append(localNo); | |
| 1077 } | |
| 1078 | |
| 1079 // | |
| 1080 // Interpreration code | |
| 1081 // | |
| 1082 | |
| 1083 void GenerateOopMap::interp_all() { | |
| 1084 bool change = true; | |
| 1085 | |
| 1086 while (change && !_got_error) { | |
| 1087 change = false; | |
| 1088 for (int i = 0; i < _bb_count && !_got_error; i++) { | |
| 1089 BasicBlock *bb = &_basic_blocks[i]; | |
| 1090 if (bb->changed()) { | |
| 1091 if (_got_error) return; | |
| 1092 change = true; | |
| 1093 bb->set_changed(false); | |
| 1094 interp_bb(bb); | |
| 1095 } | |
| 1096 } | |
| 1097 } | |
| 1098 } | |
| 1099 | |
| 1100 void GenerateOopMap::interp_bb(BasicBlock *bb) { | |
| 1101 | |
| 1102 // We do not want to do anything in case the basic-block has not been initialized. This | |
| 1103 // will happen in the case where there is dead-code hang around in a method. | |
| 1104 assert(bb->is_reachable(), "should be reachable or deadcode exist"); | |
| 1105 restore_state(bb); | |
| 1106 | |
| 1107 BytecodeStream itr(_method); | |
| 1108 | |
| 1109 // Set iterator interval to be the current basicblock | |
| 1110 int lim_bci = next_bb_start_pc(bb); | |
| 1111 itr.set_interval(bb->_bci, lim_bci); | |
| 1112 assert(lim_bci != bb->_bci, "must be at least one instruction in a basicblock"); | |
| 1113 itr.next(); // read first instruction | |
| 1114 | |
| 1115 // Iterates through all bytecodes except the last in a basic block. | |
| 1116 // We handle the last one special, since there is controlflow change. | |
| 1117 while(itr.next_bci() < lim_bci && !_got_error) { | |
| 1118 if (_has_exceptions || _monitor_top != 0) { | |
| 1119 // We do not need to interpret the results of exceptional | |
| 1120 // continuation from this instruction when the method has no | |
| 1121 // exception handlers and the monitor stack is currently | |
| 1122 // empty. | |
| 1123 do_exception_edge(&itr); | |
| 1124 } | |
| 1125 interp1(&itr); | |
| 1126 itr.next(); | |
| 1127 } | |
| 1128 | |
| 1129 // Handle last instruction. | |
| 1130 if (!_got_error) { | |
| 1131 assert(itr.next_bci() == lim_bci, "must point to end"); | |
| 1132 if (_has_exceptions || _monitor_top != 0) { | |
| 1133 do_exception_edge(&itr); | |
| 1134 } | |
| 1135 interp1(&itr); | |
| 1136 | |
| 1137 bool fall_through = jump_targets_do(&itr, GenerateOopMap::merge_state, NULL); | |
| 1138 if (_got_error) return; | |
| 1139 | |
| 1140 if (itr.code() == Bytecodes::_ret) { | |
| 1141 assert(!fall_through, "cannot be set if ret instruction"); | |
| 1142 // Automatically handles 'wide' ret indicies | |
| 1143 ret_jump_targets_do(&itr, GenerateOopMap::merge_state, itr.get_index(), NULL); | |
| 1144 } else if (fall_through) { | |
| 1145 // Hit end of BB, but the instr. was a fall-through instruction, | |
| 1146 // so perform transition as if the BB ended in a "jump". | |
| 1147 if (lim_bci != bb[1]._bci) { | |
| 1148 verify_error("bytecodes fell through last instruction"); | |
| 1149 return; | |
| 1150 } | |
| 1151 merge_state_into_bb(bb + 1); | |
| 1152 } | |
| 1153 } | |
| 1154 } | |
| 1155 | |
| 1156 void GenerateOopMap::do_exception_edge(BytecodeStream* itr) { | |
| 1157 // Only check exception edge, if bytecode can trap | |
| 1158 if (!Bytecodes::can_trap(itr->code())) return; | |
| 1159 switch (itr->code()) { | |
| 1160 case Bytecodes::_aload_0: | |
| 1161 // These bytecodes can trap for rewriting. We need to assume that | |
| 1162 // they do not throw exceptions to make the monitor analysis work. | |
| 1163 return; | |
| 1164 | |
| 1165 case Bytecodes::_ireturn: | |
| 1166 case Bytecodes::_lreturn: | |
| 1167 case Bytecodes::_freturn: | |
| 1168 case Bytecodes::_dreturn: | |
| 1169 case Bytecodes::_areturn: | |
| 1170 case Bytecodes::_return: | |
| 1171 // If the monitor stack height is not zero when we leave the method, | |
| 1172 // then we are either exiting with a non-empty stack or we have | |
| 1173 // found monitor trouble earlier in our analysis. In either case, | |
| 1174 // assume an exception could be taken here. | |
| 1175 if (_monitor_top == 0) { | |
| 1176 return; | |
| 1177 } | |
| 1178 break; | |
| 1179 | |
| 1180 case Bytecodes::_monitorexit: | |
| 1181 // If the monitor stack height is bad_monitors, then we have detected a | |
| 1182 // monitor matching problem earlier in the analysis. If the | |
| 1183 // monitor stack height is 0, we are about to pop a monitor | |
| 1184 // off of an empty stack. In either case, the bytecode | |
| 1185 // could throw an exception. | |
| 1186 if (_monitor_top != bad_monitors && _monitor_top != 0) { | |
| 1187 return; | |
| 1188 } | |
| 1189 break; | |
| 1190 } | |
| 1191 | |
| 1192 if (_has_exceptions) { | |
| 1193 int bci = itr->bci(); | |
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1194 ExceptionTable exct(method()); |
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1195 for(int i = 0; i< exct.length(); i++) { |
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1196 int start_pc = exct.start_pc(i); |
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1197 int end_pc = exct.end_pc(i); |
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1198 int handler_pc = exct.handler_pc(i); |
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1199 int catch_type = exct.catch_type_index(i); |
| 0 | 1200 |
| 1201 if (start_pc <= bci && bci < end_pc) { | |
| 1202 BasicBlock *excBB = get_basic_block_at(handler_pc); | |
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1203 guarantee(excBB != NULL, "no basic block for exception"); |
| 0 | 1204 CellTypeState *excStk = excBB->stack(); |
| 1205 CellTypeState *cOpStck = stack(); | |
| 1206 CellTypeState cOpStck_0 = cOpStck[0]; | |
| 1207 int cOpStackTop = _stack_top; | |
| 1208 | |
| 1209 // Exception stacks are always the same. | |
| 1210 assert(method()->max_stack() > 0, "sanity check"); | |
| 1211 | |
| 1212 // We remembered the size and first element of "cOpStck" | |
| 1213 // above; now we temporarily set them to the appropriate | |
| 1214 // values for an exception handler. */ | |
| 1215 cOpStck[0] = CellTypeState::make_slot_ref(_max_locals); | |
| 1216 _stack_top = 1; | |
| 1217 | |
| 1218 merge_state_into_bb(excBB); | |
| 1219 | |
| 1220 // Now undo the temporary change. | |
| 1221 cOpStck[0] = cOpStck_0; | |
| 1222 _stack_top = cOpStackTop; | |
| 1223 | |
| 1224 // If this is a "catch all" handler, then we do not need to | |
| 1225 // consider any additional handlers. | |
| 1226 if (catch_type == 0) { | |
| 1227 return; | |
| 1228 } | |
| 1229 } | |
| 1230 } | |
| 1231 } | |
| 1232 | |
| 1233 // It is possible that none of the exception handlers would have caught | |
| 1234 // the exception. In this case, we will exit the method. We must | |
| 1235 // ensure that the monitor stack is empty in this case. | |
| 1236 if (_monitor_top == 0) { | |
| 1237 return; | |
| 1238 } | |
| 1239 | |
| 1240 // We pessimistically assume that this exception can escape the | |
| 1241 // method. (It is possible that it will always be caught, but | |
| 1242 // we don't care to analyse the types of the catch clauses.) | |
| 1243 | |
| 1244 // We don't set _monitor_top to bad_monitors because there are no successors | |
| 1245 // to this exceptional exit. | |
| 1246 | |
| 1247 if (TraceMonitorMismatch && _monitor_safe) { | |
| 1248 // We check _monitor_safe so that we only report the first mismatched | |
| 1249 // exceptional exit. | |
| 1250 report_monitor_mismatch("non-empty monitor stack at exceptional exit"); | |
| 1251 } | |
| 1252 _monitor_safe = false; | |
| 1253 | |
| 1254 } | |
| 1255 | |
| 1256 void GenerateOopMap::report_monitor_mismatch(const char *msg) { | |
| 1257 #ifndef PRODUCT | |
| 1258 tty->print(" Monitor mismatch in method "); | |
| 1259 method()->print_short_name(tty); | |
| 1260 tty->print_cr(": %s", msg); | |
| 1261 #endif | |
| 1262 } | |
| 1263 | |
| 1264 void GenerateOopMap::print_states(outputStream *os, | |
| 1265 CellTypeState* vec, int num) { | |
| 1266 for (int i = 0; i < num; i++) { | |
| 1267 vec[i].print(tty); | |
| 1268 } | |
| 1269 } | |
| 1270 | |
| 1271 // Print the state values at the current bytecode. | |
| 1272 void GenerateOopMap::print_current_state(outputStream *os, | |
| 1273 BytecodeStream *currentBC, | |
| 1274 bool detailed) { | |
| 1275 | |
| 1276 if (detailed) { | |
| 1277 os->print(" %4d vars = ", currentBC->bci()); | |
| 1278 print_states(os, vars(), _max_locals); | |
| 1279 os->print(" %s", Bytecodes::name(currentBC->code())); | |
| 1280 switch(currentBC->code()) { | |
| 1281 case Bytecodes::_invokevirtual: | |
| 1282 case Bytecodes::_invokespecial: | |
| 1283 case Bytecodes::_invokestatic: | |
|
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1284 case Bytecodes::_invokedynamic: |
| 0 | 1285 case Bytecodes::_invokeinterface: |
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1286 int idx = currentBC->has_index_u4() ? currentBC->get_index_u4() : currentBC->get_index_u2_cpcache(); |
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1287 ConstantPool* cp = method()->constants(); |
| 0 | 1288 int nameAndTypeIdx = cp->name_and_type_ref_index_at(idx); |
| 1289 int signatureIdx = cp->signature_ref_index_at(nameAndTypeIdx); | |
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1290 Symbol* signature = cp->symbol_at(signatureIdx); |
| 0 | 1291 os->print("%s", signature->as_C_string()); |
| 1292 } | |
| 1293 os->cr(); | |
| 1294 os->print(" stack = "); | |
| 1295 print_states(os, stack(), _stack_top); | |
| 1296 os->cr(); | |
| 1297 if (_monitor_top != bad_monitors) { | |
| 1298 os->print(" monitors = "); | |
| 1299 print_states(os, monitors(), _monitor_top); | |
| 1300 } else { | |
| 1301 os->print(" [bad monitor stack]"); | |
| 1302 } | |
| 1303 os->cr(); | |
| 1304 } else { | |
| 1305 os->print(" %4d vars = '%s' ", currentBC->bci(), state_vec_to_string(vars(), _max_locals)); | |
| 1306 os->print(" stack = '%s' ", state_vec_to_string(stack(), _stack_top)); | |
| 1307 if (_monitor_top != bad_monitors) { | |
| 1308 os->print(" monitors = '%s' \t%s", state_vec_to_string(monitors(), _monitor_top), Bytecodes::name(currentBC->code())); | |
| 1309 } else { | |
| 1310 os->print(" [bad monitor stack]"); | |
| 1311 } | |
| 1312 switch(currentBC->code()) { | |
| 1313 case Bytecodes::_invokevirtual: | |
| 1314 case Bytecodes::_invokespecial: | |
| 1315 case Bytecodes::_invokestatic: | |
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1316 case Bytecodes::_invokedynamic: |
| 0 | 1317 case Bytecodes::_invokeinterface: |
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1318 int idx = currentBC->has_index_u4() ? currentBC->get_index_u4() : currentBC->get_index_u2_cpcache(); |
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1319 ConstantPool* cp = method()->constants(); |
| 0 | 1320 int nameAndTypeIdx = cp->name_and_type_ref_index_at(idx); |
| 1321 int signatureIdx = cp->signature_ref_index_at(nameAndTypeIdx); | |
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1322 Symbol* signature = cp->symbol_at(signatureIdx); |
| 0 | 1323 os->print("%s", signature->as_C_string()); |
| 1324 } | |
| 1325 os->cr(); | |
| 1326 } | |
| 1327 } | |
| 1328 | |
| 1329 // Sets the current state to be the state after executing the | |
| 1330 // current instruction, starting in the current state. | |
| 1331 void GenerateOopMap::interp1(BytecodeStream *itr) { | |
| 1332 if (TraceNewOopMapGeneration) { | |
| 1333 print_current_state(tty, itr, TraceNewOopMapGenerationDetailed); | |
| 1334 } | |
| 1335 | |
| 1336 // Should we report the results? Result is reported *before* the instruction at the current bci is executed. | |
| 1337 // However, not for calls. For calls we do not want to include the arguments, so we postpone the reporting until | |
| 1338 // they have been popped (in method ppl). | |
| 1339 if (_report_result == true) { | |
| 1340 switch(itr->code()) { | |
| 1341 case Bytecodes::_invokevirtual: | |
| 1342 case Bytecodes::_invokespecial: | |
| 1343 case Bytecodes::_invokestatic: | |
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1344 case Bytecodes::_invokedynamic: |
| 0 | 1345 case Bytecodes::_invokeinterface: |
| 1346 _itr_send = itr; | |
| 1347 _report_result_for_send = true; | |
| 1348 break; | |
| 1349 default: | |
| 1350 fill_stackmap_for_opcodes(itr, vars(), stack(), _stack_top); | |
| 1351 break; | |
| 1352 } | |
| 1353 } | |
| 1354 | |
| 1355 // abstract interpretation of current opcode | |
| 1356 switch(itr->code()) { | |
| 1357 case Bytecodes::_nop: break; | |
| 1358 case Bytecodes::_goto: break; | |
| 1359 case Bytecodes::_goto_w: break; | |
| 1360 case Bytecodes::_iinc: break; | |
| 1361 case Bytecodes::_return: do_return_monitor_check(); | |
| 1362 break; | |
| 1363 | |
| 1364 case Bytecodes::_aconst_null: | |
| 1365 case Bytecodes::_new: ppush1(CellTypeState::make_line_ref(itr->bci())); | |
| 1366 break; | |
| 1367 | |
| 1368 case Bytecodes::_iconst_m1: | |
| 1369 case Bytecodes::_iconst_0: | |
| 1370 case Bytecodes::_iconst_1: | |
| 1371 case Bytecodes::_iconst_2: | |
| 1372 case Bytecodes::_iconst_3: | |
| 1373 case Bytecodes::_iconst_4: | |
| 1374 case Bytecodes::_iconst_5: | |
| 1375 case Bytecodes::_fconst_0: | |
| 1376 case Bytecodes::_fconst_1: | |
| 1377 case Bytecodes::_fconst_2: | |
| 1378 case Bytecodes::_bipush: | |
| 1379 case Bytecodes::_sipush: ppush1(valCTS); break; | |
| 1380 | |
| 1381 case Bytecodes::_lconst_0: | |
| 1382 case Bytecodes::_lconst_1: | |
| 1383 case Bytecodes::_dconst_0: | |
| 1384 case Bytecodes::_dconst_1: ppush(vvCTS); break; | |
| 1385 | |
| 1386 case Bytecodes::_ldc2_w: ppush(vvCTS); break; | |
| 1387 | |
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6981788: GC map generator sometimes picks up the wrong kind of instruction operand
jrose
parents:
1681
diff
changeset
|
1388 case Bytecodes::_ldc: // fall through: |
|
d1896d1dda3e
6981788: GC map generator sometimes picks up the wrong kind of instruction operand
jrose
parents:
1681
diff
changeset
|
1389 case Bytecodes::_ldc_w: do_ldc(itr->bci()); break; |
| 0 | 1390 |
| 1391 case Bytecodes::_iload: | |
| 1392 case Bytecodes::_fload: ppload(vCTS, itr->get_index()); break; | |
| 1393 | |
| 1394 case Bytecodes::_lload: | |
| 1395 case Bytecodes::_dload: ppload(vvCTS,itr->get_index()); break; | |
| 1396 | |
| 1397 case Bytecodes::_aload: ppload(rCTS, itr->get_index()); break; | |
| 1398 | |
| 1399 case Bytecodes::_iload_0: | |
| 1400 case Bytecodes::_fload_0: ppload(vCTS, 0); break; | |
| 1401 case Bytecodes::_iload_1: | |
| 1402 case Bytecodes::_fload_1: ppload(vCTS, 1); break; | |
| 1403 case Bytecodes::_iload_2: | |
| 1404 case Bytecodes::_fload_2: ppload(vCTS, 2); break; | |
| 1405 case Bytecodes::_iload_3: | |
| 1406 case Bytecodes::_fload_3: ppload(vCTS, 3); break; | |
| 1407 | |
| 1408 case Bytecodes::_lload_0: | |
| 1409 case Bytecodes::_dload_0: ppload(vvCTS, 0); break; | |
| 1410 case Bytecodes::_lload_1: | |
| 1411 case Bytecodes::_dload_1: ppload(vvCTS, 1); break; | |
| 1412 case Bytecodes::_lload_2: | |
| 1413 case Bytecodes::_dload_2: ppload(vvCTS, 2); break; | |
| 1414 case Bytecodes::_lload_3: | |
| 1415 case Bytecodes::_dload_3: ppload(vvCTS, 3); break; | |
| 1416 | |
| 1417 case Bytecodes::_aload_0: ppload(rCTS, 0); break; | |
| 1418 case Bytecodes::_aload_1: ppload(rCTS, 1); break; | |
| 1419 case Bytecodes::_aload_2: ppload(rCTS, 2); break; | |
| 1420 case Bytecodes::_aload_3: ppload(rCTS, 3); break; | |
| 1421 | |
| 1422 case Bytecodes::_iaload: | |
| 1423 case Bytecodes::_faload: | |
| 1424 case Bytecodes::_baload: | |
| 1425 case Bytecodes::_caload: | |
| 1426 case Bytecodes::_saload: pp(vrCTS, vCTS); break; | |
| 1427 | |
| 1428 case Bytecodes::_laload: pp(vrCTS, vvCTS); break; | |
| 1429 case Bytecodes::_daload: pp(vrCTS, vvCTS); break; | |
| 1430 | |
| 1431 case Bytecodes::_aaload: pp_new_ref(vrCTS, itr->bci()); break; | |
| 1432 | |
| 1433 case Bytecodes::_istore: | |
| 1434 case Bytecodes::_fstore: ppstore(vCTS, itr->get_index()); break; | |
| 1435 | |
| 1436 case Bytecodes::_lstore: | |
| 1437 case Bytecodes::_dstore: ppstore(vvCTS, itr->get_index()); break; | |
| 1438 | |
| 1439 case Bytecodes::_astore: do_astore(itr->get_index()); break; | |
| 1440 | |
| 1441 case Bytecodes::_istore_0: | |
| 1442 case Bytecodes::_fstore_0: ppstore(vCTS, 0); break; | |
| 1443 case Bytecodes::_istore_1: | |
| 1444 case Bytecodes::_fstore_1: ppstore(vCTS, 1); break; | |
| 1445 case Bytecodes::_istore_2: | |
| 1446 case Bytecodes::_fstore_2: ppstore(vCTS, 2); break; | |
| 1447 case Bytecodes::_istore_3: | |
| 1448 case Bytecodes::_fstore_3: ppstore(vCTS, 3); break; | |
| 1449 | |
| 1450 case Bytecodes::_lstore_0: | |
| 1451 case Bytecodes::_dstore_0: ppstore(vvCTS, 0); break; | |
| 1452 case Bytecodes::_lstore_1: | |
| 1453 case Bytecodes::_dstore_1: ppstore(vvCTS, 1); break; | |
| 1454 case Bytecodes::_lstore_2: | |
| 1455 case Bytecodes::_dstore_2: ppstore(vvCTS, 2); break; | |
| 1456 case Bytecodes::_lstore_3: | |
| 1457 case Bytecodes::_dstore_3: ppstore(vvCTS, 3); break; | |
| 1458 | |
| 1459 case Bytecodes::_astore_0: do_astore(0); break; | |
| 1460 case Bytecodes::_astore_1: do_astore(1); break; | |
| 1461 case Bytecodes::_astore_2: do_astore(2); break; | |
| 1462 case Bytecodes::_astore_3: do_astore(3); break; | |
| 1463 | |
| 1464 case Bytecodes::_iastore: | |
| 1465 case Bytecodes::_fastore: | |
| 1466 case Bytecodes::_bastore: | |
| 1467 case Bytecodes::_castore: | |
| 1468 case Bytecodes::_sastore: ppop(vvrCTS); break; | |
| 1469 case Bytecodes::_lastore: | |
| 1470 case Bytecodes::_dastore: ppop(vvvrCTS); break; | |
| 1471 case Bytecodes::_aastore: ppop(rvrCTS); break; | |
| 1472 | |
| 1473 case Bytecodes::_pop: ppop_any(1); break; | |
| 1474 case Bytecodes::_pop2: ppop_any(2); break; | |
| 1475 | |
| 1476 case Bytecodes::_dup: ppdupswap(1, "11"); break; | |
| 1477 case Bytecodes::_dup_x1: ppdupswap(2, "121"); break; | |
| 1478 case Bytecodes::_dup_x2: ppdupswap(3, "1321"); break; | |
| 1479 case Bytecodes::_dup2: ppdupswap(2, "2121"); break; | |
| 1480 case Bytecodes::_dup2_x1: ppdupswap(3, "21321"); break; | |
| 1481 case Bytecodes::_dup2_x2: ppdupswap(4, "214321"); break; | |
| 1482 case Bytecodes::_swap: ppdupswap(2, "12"); break; | |
| 1483 | |
| 1484 case Bytecodes::_iadd: | |
| 1485 case Bytecodes::_fadd: | |
| 1486 case Bytecodes::_isub: | |
| 1487 case Bytecodes::_fsub: | |
| 1488 case Bytecodes::_imul: | |
| 1489 case Bytecodes::_fmul: | |
| 1490 case Bytecodes::_idiv: | |
| 1491 case Bytecodes::_fdiv: | |
| 1492 case Bytecodes::_irem: | |
| 1493 case Bytecodes::_frem: | |
| 1494 case Bytecodes::_ishl: | |
| 1495 case Bytecodes::_ishr: | |
| 1496 case Bytecodes::_iushr: | |
| 1497 case Bytecodes::_iand: | |
| 1498 case Bytecodes::_ior: | |
| 1499 case Bytecodes::_ixor: | |
| 1500 case Bytecodes::_l2f: | |
| 1501 case Bytecodes::_l2i: | |
| 1502 case Bytecodes::_d2f: | |
| 1503 case Bytecodes::_d2i: | |
| 1504 case Bytecodes::_fcmpl: | |
| 1505 case Bytecodes::_fcmpg: pp(vvCTS, vCTS); break; | |
| 1506 | |
| 1507 case Bytecodes::_ladd: | |
| 1508 case Bytecodes::_dadd: | |
| 1509 case Bytecodes::_lsub: | |
| 1510 case Bytecodes::_dsub: | |
| 1511 case Bytecodes::_lmul: | |
| 1512 case Bytecodes::_dmul: | |
| 1513 case Bytecodes::_ldiv: | |
| 1514 case Bytecodes::_ddiv: | |
| 1515 case Bytecodes::_lrem: | |
| 1516 case Bytecodes::_drem: | |
| 1517 case Bytecodes::_land: | |
| 1518 case Bytecodes::_lor: | |
| 1519 case Bytecodes::_lxor: pp(vvvvCTS, vvCTS); break; | |
| 1520 | |
| 1521 case Bytecodes::_ineg: | |
| 1522 case Bytecodes::_fneg: | |
| 1523 case Bytecodes::_i2f: | |
| 1524 case Bytecodes::_f2i: | |
| 1525 case Bytecodes::_i2c: | |
| 1526 case Bytecodes::_i2s: | |
| 1527 case Bytecodes::_i2b: pp(vCTS, vCTS); break; | |
| 1528 | |
| 1529 case Bytecodes::_lneg: | |
| 1530 case Bytecodes::_dneg: | |
| 1531 case Bytecodes::_l2d: | |
| 1532 case Bytecodes::_d2l: pp(vvCTS, vvCTS); break; | |
| 1533 | |
| 1534 case Bytecodes::_lshl: | |
| 1535 case Bytecodes::_lshr: | |
| 1536 case Bytecodes::_lushr: pp(vvvCTS, vvCTS); break; | |
| 1537 | |
| 1538 case Bytecodes::_i2l: | |
| 1539 case Bytecodes::_i2d: | |
| 1540 case Bytecodes::_f2l: | |
| 1541 case Bytecodes::_f2d: pp(vCTS, vvCTS); break; | |
| 1542 | |
| 1543 case Bytecodes::_lcmp: pp(vvvvCTS, vCTS); break; | |
| 1544 case Bytecodes::_dcmpl: | |
| 1545 case Bytecodes::_dcmpg: pp(vvvvCTS, vCTS); break; | |
| 1546 | |
| 1547 case Bytecodes::_ifeq: | |
| 1548 case Bytecodes::_ifne: | |
| 1549 case Bytecodes::_iflt: | |
| 1550 case Bytecodes::_ifge: | |
| 1551 case Bytecodes::_ifgt: | |
| 1552 case Bytecodes::_ifle: | |
| 1553 case Bytecodes::_tableswitch: ppop1(valCTS); | |
| 1554 break; | |
| 1555 case Bytecodes::_ireturn: | |
| 1556 case Bytecodes::_freturn: do_return_monitor_check(); | |
| 1557 ppop1(valCTS); | |
| 1558 break; | |
| 1559 case Bytecodes::_if_icmpeq: | |
| 1560 case Bytecodes::_if_icmpne: | |
| 1561 case Bytecodes::_if_icmplt: | |
| 1562 case Bytecodes::_if_icmpge: | |
| 1563 case Bytecodes::_if_icmpgt: | |
| 1564 case Bytecodes::_if_icmple: ppop(vvCTS); | |
| 1565 break; | |
| 1566 | |
| 1567 case Bytecodes::_lreturn: do_return_monitor_check(); | |
| 1568 ppop(vvCTS); | |
| 1569 break; | |
| 1570 | |
| 1571 case Bytecodes::_dreturn: do_return_monitor_check(); | |
| 1572 ppop(vvCTS); | |
| 1573 break; | |
| 1574 | |
| 1575 case Bytecodes::_if_acmpeq: | |
| 1576 case Bytecodes::_if_acmpne: ppop(rrCTS); break; | |
| 1577 | |
| 1578 case Bytecodes::_jsr: do_jsr(itr->dest()); break; | |
| 1579 case Bytecodes::_jsr_w: do_jsr(itr->dest_w()); break; | |
| 1580 | |
|
3838
6a991dcb52bb
7012081: JSR 292: SA-JDI can't read MH/MT/Indy ConstantPool entries
never
parents:
2177
diff
changeset
|
1581 case Bytecodes::_getstatic: do_field(true, true, itr->get_index_u2_cpcache(), itr->bci()); break; |
| 1565 | 1582 case Bytecodes::_putstatic: do_field(false, true, itr->get_index_u2_cpcache(), itr->bci()); break; |
| 1583 case Bytecodes::_getfield: do_field(true, false, itr->get_index_u2_cpcache(), itr->bci()); break; | |
| 1584 case Bytecodes::_putfield: do_field(false, false, itr->get_index_u2_cpcache(), itr->bci()); break; | |
| 0 | 1585 |
|
1138
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
1059
diff
changeset
|
1586 case Bytecodes::_invokevirtual: |
| 1565 | 1587 case Bytecodes::_invokespecial: do_method(false, false, itr->get_index_u2_cpcache(), itr->bci()); break; |
| 1588 case Bytecodes::_invokestatic: do_method(true, false, itr->get_index_u2_cpcache(), itr->bci()); break; | |
| 1589 case Bytecodes::_invokedynamic: do_method(true, false, itr->get_index_u4(), itr->bci()); break; | |
| 1590 case Bytecodes::_invokeinterface: do_method(false, true, itr->get_index_u2_cpcache(), itr->bci()); break; | |
|
1138
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
1059
diff
changeset
|
1591 case Bytecodes::_newarray: |
|
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
1059
diff
changeset
|
1592 case Bytecodes::_anewarray: pp_new_ref(vCTS, itr->bci()); break; |
| 0 | 1593 case Bytecodes::_checkcast: do_checkcast(); break; |
| 1594 case Bytecodes::_arraylength: | |
| 1595 case Bytecodes::_instanceof: pp(rCTS, vCTS); break; | |
| 1596 case Bytecodes::_monitorenter: do_monitorenter(itr->bci()); break; | |
| 1597 case Bytecodes::_monitorexit: do_monitorexit(itr->bci()); break; | |
| 1598 | |
| 1599 case Bytecodes::_athrow: // handled by do_exception_edge() BUT ... | |
| 1600 // vlh(apple): do_exception_edge() does not get | |
| 1601 // called if method has no exception handlers | |
| 1602 if ((!_has_exceptions) && (_monitor_top > 0)) { | |
| 1603 _monitor_safe = false; | |
| 1604 } | |
| 1605 break; | |
| 1606 | |
| 1607 case Bytecodes::_areturn: do_return_monitor_check(); | |
| 1608 ppop1(refCTS); | |
| 1609 break; | |
| 1610 case Bytecodes::_ifnull: | |
| 1611 case Bytecodes::_ifnonnull: ppop1(refCTS); break; | |
| 1612 case Bytecodes::_multianewarray: do_multianewarray(*(itr->bcp()+3), itr->bci()); break; | |
| 1613 | |
| 1614 case Bytecodes::_wide: fatal("Iterator should skip this bytecode"); break; | |
| 1615 case Bytecodes::_ret: break; | |
| 1616 | |
| 1617 // Java opcodes | |
| 1618 case Bytecodes::_lookupswitch: ppop1(valCTS); break; | |
| 1619 | |
| 1620 default: | |
| 1621 tty->print("unexpected opcode: %d\n", itr->code()); | |
| 1622 ShouldNotReachHere(); | |
| 1623 break; | |
| 1624 } | |
| 1625 } | |
| 1626 | |
| 1627 void GenerateOopMap::check_type(CellTypeState expected, CellTypeState actual) { | |
| 1628 if (!expected.equal_kind(actual)) { | |
| 1629 verify_error("wrong type on stack (found: %c expected: %c)", actual.to_char(), expected.to_char()); | |
| 1630 } | |
| 1631 } | |
| 1632 | |
| 1633 void GenerateOopMap::ppstore(CellTypeState *in, int loc_no) { | |
| 1634 while(!(*in).is_bottom()) { | |
| 1635 CellTypeState expected =*in++; | |
| 1636 CellTypeState actual = pop(); | |
| 1637 check_type(expected, actual); | |
| 1638 assert(loc_no >= 0, "sanity check"); | |
| 1639 set_var(loc_no++, actual); | |
| 1640 } | |
| 1641 } | |
| 1642 | |
| 1643 void GenerateOopMap::ppload(CellTypeState *out, int loc_no) { | |
| 1644 while(!(*out).is_bottom()) { | |
| 1645 CellTypeState out1 = *out++; | |
| 1646 CellTypeState vcts = get_var(loc_no); | |
| 1647 assert(out1.can_be_reference() || out1.can_be_value(), | |
| 1648 "can only load refs. and values."); | |
| 1649 if (out1.is_reference()) { | |
| 1650 assert(loc_no>=0, "sanity check"); | |
| 1651 if (!vcts.is_reference()) { | |
| 1652 // We were asked to push a reference, but the type of the | |
| 1653 // variable can be something else | |
| 1654 _conflict = true; | |
| 1655 if (vcts.can_be_uninit()) { | |
| 1656 // It is a ref-uninit conflict (at least). If there are other | |
| 1657 // problems, we'll get them in the next round | |
| 1658 add_to_ref_init_set(loc_no); | |
| 1659 vcts = out1; | |
| 1660 } else { | |
| 1661 // It wasn't a ref-uninit conflict. So must be a | |
| 1662 // ref-val or ref-pc conflict. Split the variable. | |
| 1663 record_refval_conflict(loc_no); | |
| 1664 vcts = out1; | |
| 1665 } | |
| 1666 push(out1); // recover... | |
| 1667 } else { | |
| 1668 push(vcts); // preserve reference. | |
| 1669 } | |
| 1670 // Otherwise it is a conflict, but one that verification would | |
| 1671 // have caught if illegal. In particular, it can't be a topCTS | |
| 1672 // resulting from mergeing two difference pcCTS's since the verifier | |
| 1673 // would have rejected any use of such a merge. | |
| 1674 } else { | |
| 1675 push(out1); // handle val/init conflict | |
| 1676 } | |
| 1677 loc_no++; | |
| 1678 } | |
| 1679 } | |
| 1680 | |
| 1681 void GenerateOopMap::ppdupswap(int poplen, const char *out) { | |
| 1682 CellTypeState actual[5]; | |
| 1683 assert(poplen < 5, "this must be less than length of actual vector"); | |
| 1684 | |
| 1685 // pop all arguments | |
| 1686 for(int i = 0; i < poplen; i++) actual[i] = pop(); | |
| 1687 | |
| 1688 // put them back | |
| 1689 char push_ch = *out++; | |
| 1690 while (push_ch != '\0') { | |
| 1691 int idx = push_ch - '1'; | |
| 1692 assert(idx >= 0 && idx < poplen, "wrong arguments"); | |
| 1693 push(actual[idx]); | |
| 1694 push_ch = *out++; | |
| 1695 } | |
| 1696 } | |
| 1697 | |
| 1698 void GenerateOopMap::ppop1(CellTypeState out) { | |
| 1699 CellTypeState actual = pop(); | |
| 1700 check_type(out, actual); | |
| 1701 } | |
| 1702 | |
| 1703 void GenerateOopMap::ppop(CellTypeState *out) { | |
| 1704 while (!(*out).is_bottom()) { | |
| 1705 ppop1(*out++); | |
| 1706 } | |
| 1707 } | |
| 1708 | |
| 1709 void GenerateOopMap::ppush1(CellTypeState in) { | |
| 1710 assert(in.is_reference() | in.is_value(), "sanity check"); | |
| 1711 push(in); | |
| 1712 } | |
| 1713 | |
| 1714 void GenerateOopMap::ppush(CellTypeState *in) { | |
| 1715 while (!(*in).is_bottom()) { | |
| 1716 ppush1(*in++); | |
| 1717 } | |
| 1718 } | |
| 1719 | |
| 1720 void GenerateOopMap::pp(CellTypeState *in, CellTypeState *out) { | |
| 1721 ppop(in); | |
| 1722 ppush(out); | |
| 1723 } | |
| 1724 | |
| 1725 void GenerateOopMap::pp_new_ref(CellTypeState *in, int bci) { | |
| 1726 ppop(in); | |
| 1727 ppush1(CellTypeState::make_line_ref(bci)); | |
| 1728 } | |
| 1729 | |
| 1730 void GenerateOopMap::ppop_any(int poplen) { | |
| 1731 if (_stack_top >= poplen) { | |
| 1732 _stack_top -= poplen; | |
| 1733 } else { | |
| 1734 verify_error("stack underflow"); | |
| 1735 } | |
| 1736 } | |
| 1737 | |
| 1738 // Replace all occurences of the state 'match' with the state 'replace' | |
| 1739 // in our current state vector. | |
| 1740 void GenerateOopMap::replace_all_CTS_matches(CellTypeState match, | |
| 1741 CellTypeState replace) { | |
| 1742 int i; | |
| 1743 int len = _max_locals + _stack_top; | |
| 1744 bool change = false; | |
| 1745 | |
| 1746 for (i = len - 1; i >= 0; i--) { | |
| 1747 if (match.equal(_state[i])) { | |
| 1748 _state[i] = replace; | |
| 1749 } | |
| 1750 } | |
| 1751 | |
| 1752 if (_monitor_top > 0) { | |
| 1753 int base = _max_locals + _max_stack; | |
| 1754 len = base + _monitor_top; | |
| 1755 for (i = len - 1; i >= base; i--) { | |
| 1756 if (match.equal(_state[i])) { | |
| 1757 _state[i] = replace; | |
| 1758 } | |
| 1759 } | |
| 1760 } | |
| 1761 } | |
| 1762 | |
| 1763 void GenerateOopMap::do_checkcast() { | |
| 1764 CellTypeState actual = pop(); | |
| 1765 check_type(refCTS, actual); | |
| 1766 push(actual); | |
| 1767 } | |
| 1768 | |
| 1769 void GenerateOopMap::do_monitorenter(int bci) { | |
| 1770 CellTypeState actual = pop(); | |
| 1771 if (_monitor_top == bad_monitors) { | |
| 1772 return; | |
| 1773 } | |
| 1774 | |
| 1775 // Bail out when we get repeated locks on an identical monitor. This case | |
| 1776 // isn't too hard to handle and can be made to work if supporting nested | |
| 1777 // redundant synchronized statements becomes a priority. | |
| 1778 // | |
| 1779 // See also "Note" in do_monitorexit(), below. | |
| 1780 if (actual.is_lock_reference()) { | |
| 1781 _monitor_top = bad_monitors; | |
| 1782 _monitor_safe = false; | |
| 1783 | |
| 1784 if (TraceMonitorMismatch) { | |
| 1785 report_monitor_mismatch("nested redundant lock -- bailout..."); | |
| 1786 } | |
| 1787 return; | |
| 1788 } | |
| 1789 | |
| 1790 CellTypeState lock = CellTypeState::make_lock_ref(bci); | |
| 1791 check_type(refCTS, actual); | |
| 1792 if (!actual.is_info_top()) { | |
| 1793 replace_all_CTS_matches(actual, lock); | |
| 1794 monitor_push(lock); | |
| 1795 } | |
| 1796 } | |
| 1797 | |
| 1798 void GenerateOopMap::do_monitorexit(int bci) { | |
| 1799 CellTypeState actual = pop(); | |
| 1800 if (_monitor_top == bad_monitors) { | |
| 1801 return; | |
| 1802 } | |
| 1803 check_type(refCTS, actual); | |
| 1804 CellTypeState expected = monitor_pop(); | |
| 1805 if (!actual.is_lock_reference() || !expected.equal(actual)) { | |
| 1806 // The monitor we are exiting is not verifiably the one | |
| 1807 // on the top of our monitor stack. This causes a monitor | |
| 1808 // mismatch. | |
| 1809 _monitor_top = bad_monitors; | |
| 1810 _monitor_safe = false; | |
| 1811 | |
| 1812 // We need to mark this basic block as changed so that | |
| 1813 // this monitorexit will be visited again. We need to | |
| 1814 // do this to ensure that we have accounted for the | |
| 1815 // possibility that this bytecode will throw an | |
| 1816 // exception. | |
| 1817 BasicBlock* bb = get_basic_block_containing(bci); | |
|
8773
2eef6d34833b
8009022: [parfait] Null pointer deference in hotspot/src/share/vm/oops/generateOopMap.cpp
morris
parents:
8104
diff
changeset
|
1818 guarantee(bb != NULL, "no basic block for bci"); |
| 0 | 1819 bb->set_changed(true); |
| 1820 bb->_monitor_top = bad_monitors; | |
| 1821 | |
| 1822 if (TraceMonitorMismatch) { | |
| 1823 report_monitor_mismatch("improper monitor pair"); | |
| 1824 } | |
| 1825 } else { | |
| 1826 // This code is a fix for the case where we have repeated | |
| 1827 // locking of the same object in straightline code. We clear | |
| 1828 // out the lock when it is popped from the monitor stack | |
| 1829 // and replace it with an unobtrusive reference value that can | |
| 1830 // be locked again. | |
| 1831 // | |
| 1832 // Note: when generateOopMap is fixed to properly handle repeated, | |
| 1833 // nested, redundant locks on the same object, then this | |
| 1834 // fix will need to be removed at that time. | |
| 1835 replace_all_CTS_matches(actual, CellTypeState::make_line_ref(bci)); | |
| 1836 } | |
| 1837 } | |
| 1838 | |
| 1839 void GenerateOopMap::do_return_monitor_check() { | |
| 1840 if (_monitor_top > 0) { | |
| 1841 // The monitor stack must be empty when we leave the method | |
| 1842 // for the monitors to be properly matched. | |
| 1843 _monitor_safe = false; | |
| 1844 | |
| 1845 // Since there are no successors to the *return bytecode, it | |
| 1846 // isn't necessary to set _monitor_top to bad_monitors. | |
| 1847 | |
| 1848 if (TraceMonitorMismatch) { | |
| 1849 report_monitor_mismatch("non-empty monitor stack at return"); | |
| 1850 } | |
| 1851 } | |
| 1852 } | |
| 1853 | |
| 1854 void GenerateOopMap::do_jsr(int targ_bci) { | |
| 1855 push(CellTypeState::make_addr(targ_bci)); | |
| 1856 } | |
| 1857 | |
| 1858 | |
| 1859 | |
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1860 void GenerateOopMap::do_ldc(int bci) { |
| 2142 | 1861 Bytecode_loadconstant ldc(method(), bci); |
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1862 ConstantPool* cp = method()->constants(); |
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1863 constantTag tag = cp->tag_at(ldc.pool_index()); // idx is index in resolved_references |
| 2142 | 1864 BasicType bt = ldc.result_type(); |
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1865 CellTypeState cts; |
| 17524 | 1866 if (tag.basic_type() == T_OBJECT) { |
| 1867 assert(!tag.is_string_index() && !tag.is_klass_index(), "Unexpected index tag"); | |
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1868 assert(bt == T_OBJECT, "Guard is incorrect"); |
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1869 cts = CellTypeState::make_line_ref(bci); |
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1870 } else { |
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1871 assert(bt != T_OBJECT, "Guard is incorrect"); |
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1872 cts = valCTS; |
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1873 } |
| 0 | 1874 ppush1(cts); |
| 1875 } | |
| 1876 | |
| 1877 void GenerateOopMap::do_multianewarray(int dims, int bci) { | |
| 1878 assert(dims >= 1, "sanity check"); | |
| 1879 for(int i = dims -1; i >=0; i--) { | |
| 1880 ppop1(valCTS); | |
| 1881 } | |
| 1882 ppush1(CellTypeState::make_line_ref(bci)); | |
| 1883 } | |
| 1884 | |
| 1885 void GenerateOopMap::do_astore(int idx) { | |
| 1886 CellTypeState r_or_p = pop(); | |
| 1887 if (!r_or_p.is_address() && !r_or_p.is_reference()) { | |
| 1888 // We actually expected ref or pc, but we only report that we expected a ref. It does not | |
| 1889 // really matter (at least for now) | |
| 1890 verify_error("wrong type on stack (found: %c, expected: {pr})", r_or_p.to_char()); | |
| 1891 return; | |
| 1892 } | |
| 1893 set_var(idx, r_or_p); | |
| 1894 } | |
| 1895 | |
| 1896 // Copies bottom/zero terminated CTS string from "src" into "dst". | |
| 1897 // Does NOT terminate with a bottom. Returns the number of cells copied. | |
| 1898 int GenerateOopMap::copy_cts(CellTypeState *dst, CellTypeState *src) { | |
| 1899 int idx = 0; | |
| 1900 while (!src[idx].is_bottom()) { | |
| 1901 dst[idx] = src[idx]; | |
| 1902 idx++; | |
| 1903 } | |
| 1904 return idx; | |
| 1905 } | |
| 1906 | |
| 1907 void GenerateOopMap::do_field(int is_get, int is_static, int idx, int bci) { | |
| 1908 // Dig up signature for field in constant pool | |
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1909 ConstantPool* cp = method()->constants(); |
| 0 | 1910 int nameAndTypeIdx = cp->name_and_type_ref_index_at(idx); |
| 1911 int signatureIdx = cp->signature_ref_index_at(nameAndTypeIdx); | |
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1912 Symbol* signature = cp->symbol_at(signatureIdx); |
| 0 | 1913 |
| 1914 // Parse signature (espcially simple for fields) | |
| 1915 assert(signature->utf8_length() > 0, "field signatures cannot have zero length"); | |
| 1916 // The signature is UFT8 encoded, but the first char is always ASCII for signatures. | |
| 1917 char sigch = (char)*(signature->base()); | |
| 1918 CellTypeState temp[4]; | |
| 1919 CellTypeState *eff = sigchar_to_effect(sigch, bci, temp); | |
| 1920 | |
| 1921 CellTypeState in[4]; | |
| 1922 CellTypeState *out; | |
| 1923 int i = 0; | |
| 1924 | |
| 1925 if (is_get) { | |
| 1926 out = eff; | |
| 1927 } else { | |
| 1928 out = epsilonCTS; | |
| 1929 i = copy_cts(in, eff); | |
| 1930 } | |
| 1931 if (!is_static) in[i++] = CellTypeState::ref; | |
| 1932 in[i] = CellTypeState::bottom; | |
| 1933 assert(i<=3, "sanity check"); | |
| 1934 pp(in, out); | |
| 1935 } | |
| 1936 | |
| 1937 void GenerateOopMap::do_method(int is_static, int is_interface, int idx, int bci) { | |
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1938 // Dig up signature for field in constant pool |
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1939 ConstantPool* cp = _method->constants(); |
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1940 Symbol* signature = cp->signature_ref_at(idx); |
| 0 | 1941 |
| 1942 // Parse method signature | |
| 1943 CellTypeState out[4]; | |
| 1944 CellTypeState in[MAXARGSIZE+1]; // Includes result | |
| 1945 ComputeCallStack cse(signature); | |
| 1946 | |
| 1947 // Compute return type | |
| 1948 int res_length= cse.compute_for_returntype(out); | |
| 1949 | |
| 1950 // Temporary hack. | |
| 1951 if (out[0].equal(CellTypeState::ref) && out[1].equal(CellTypeState::bottom)) { | |
| 1952 out[0] = CellTypeState::make_line_ref(bci); | |
| 1953 } | |
| 1954 | |
| 1955 assert(res_length<=4, "max value should be vv"); | |
| 1956 | |
| 1957 // Compute arguments | |
| 1958 int arg_length = cse.compute_for_parameters(is_static != 0, in); | |
| 1959 assert(arg_length<=MAXARGSIZE, "too many locals"); | |
| 1960 | |
| 1961 // Pop arguments | |
| 1962 for (int i = arg_length - 1; i >= 0; i--) ppop1(in[i]);// Do args in reverse order. | |
| 1963 | |
| 1964 // Report results | |
| 1965 if (_report_result_for_send == true) { | |
| 1966 fill_stackmap_for_opcodes(_itr_send, vars(), stack(), _stack_top); | |
| 1967 _report_result_for_send = false; | |
| 1968 } | |
| 1969 | |
| 1970 // Push return address | |
| 1971 ppush(out); | |
| 1972 } | |
| 1973 | |
| 1974 // This is used to parse the signature for fields, since they are very simple... | |
| 1975 CellTypeState *GenerateOopMap::sigchar_to_effect(char sigch, int bci, CellTypeState *out) { | |
| 1976 // Object and array | |
| 1977 if (sigch=='L' || sigch=='[') { | |
| 1978 out[0] = CellTypeState::make_line_ref(bci); | |
| 1979 out[1] = CellTypeState::bottom; | |
| 1980 return out; | |
| 1981 } | |
| 1982 if (sigch == 'J' || sigch == 'D' ) return vvCTS; // Long and Double | |
| 1983 if (sigch == 'V' ) return epsilonCTS; // Void | |
| 1984 return vCTS; // Otherwise | |
| 1985 } | |
| 1986 | |
| 1987 long GenerateOopMap::_total_byte_count = 0; | |
| 1988 elapsedTimer GenerateOopMap::_total_oopmap_time; | |
| 1989 | |
| 1990 // This function assumes "bcs" is at a "ret" instruction and that the vars | |
| 1991 // state is valid for that instruction. Furthermore, the ret instruction | |
| 1992 // must be the last instruction in "bb" (we store information about the | |
| 1993 // "ret" in "bb"). | |
| 1994 void GenerateOopMap::ret_jump_targets_do(BytecodeStream *bcs, jmpFct_t jmpFct, int varNo, int *data) { | |
| 1995 CellTypeState ra = vars()[varNo]; | |
| 1996 if (!ra.is_good_address()) { | |
| 1997 verify_error("ret returns from two jsr subroutines?"); | |
| 1998 return; | |
| 1999 } | |
| 2000 int target = ra.get_info(); | |
| 2001 | |
| 2002 RetTableEntry* rtEnt = _rt.find_jsrs_for_target(target); | |
| 2003 int bci = bcs->bci(); | |
| 2004 for (int i = 0; i < rtEnt->nof_jsrs(); i++) { | |
| 2005 int target_bci = rtEnt->jsrs(i); | |
| 2006 // Make sure a jrtRet does not set the changed bit for dead basicblock. | |
| 2007 BasicBlock* jsr_bb = get_basic_block_containing(target_bci - 1); | |
| 2008 debug_only(BasicBlock* target_bb = &jsr_bb[1];) | |
| 2009 assert(target_bb == get_basic_block_at(target_bci), "wrong calc. of successor basicblock"); | |
| 2010 bool alive = jsr_bb->is_alive(); | |
| 2011 if (TraceNewOopMapGeneration) { | |
| 2012 tty->print("pc = %d, ret -> %d alive: %s\n", bci, target_bci, alive ? "true" : "false"); | |
| 2013 } | |
| 2014 if (alive) jmpFct(this, target_bci, data); | |
| 2015 } | |
| 2016 } | |
| 2017 | |
| 2018 // | |
| 2019 // Debug method | |
| 2020 // | |
| 2021 char* GenerateOopMap::state_vec_to_string(CellTypeState* vec, int len) { | |
| 2022 #ifdef ASSERT | |
| 2023 int checklen = MAX3(_max_locals, _max_stack, _max_monitors) + 1; | |
| 2024 assert(len < checklen, "state_vec_buf overflow"); | |
| 2025 #endif | |
| 2026 for (int i = 0; i < len; i++) _state_vec_buf[i] = vec[i].to_char(); | |
| 2027 _state_vec_buf[len] = 0; | |
| 2028 return _state_vec_buf; | |
| 2029 } | |
| 2030 | |
| 2031 void GenerateOopMap::print_time() { | |
| 2032 tty->print_cr ("Accumulated oopmap times:"); | |
| 2033 tty->print_cr ("---------------------------"); | |
| 2034 tty->print_cr (" Total : %3.3f sec.", GenerateOopMap::_total_oopmap_time.seconds()); | |
| 2035 tty->print_cr (" (%3.0f bytecodes per sec) ", | |
| 2036 GenerateOopMap::_total_byte_count / GenerateOopMap::_total_oopmap_time.seconds()); | |
| 2037 } | |
| 2038 | |
| 2039 // | |
| 2040 // ============ Main Entry Point =========== | |
| 2041 // | |
| 2042 GenerateOopMap::GenerateOopMap(methodHandle method) { | |
| 605 | 2043 // We have to initialize all variables here, that can be queried directly |
| 0 | 2044 _method = method; |
| 2045 _max_locals=0; | |
| 2046 _init_vars = NULL; | |
| 2047 | |
| 2048 #ifndef PRODUCT | |
| 2049 // If we are doing a detailed trace, include the regular trace information. | |
| 2050 if (TraceNewOopMapGenerationDetailed) { | |
| 2051 TraceNewOopMapGeneration = true; | |
| 2052 } | |
| 2053 #endif | |
| 2054 } | |
| 2055 | |
| 2056 void GenerateOopMap::compute_map(TRAPS) { | |
| 2057 #ifndef PRODUCT | |
| 2058 if (TimeOopMap2) { | |
| 2059 method()->print_short_name(tty); | |
| 2060 tty->print(" "); | |
| 2061 } | |
| 2062 if (TimeOopMap) { | |
| 2063 _total_byte_count += method()->code_size(); | |
| 2064 } | |
| 2065 #endif | |
| 2066 TraceTime t_single("oopmap time", TimeOopMap2); | |
| 2067 TraceTime t_all(NULL, &_total_oopmap_time, TimeOopMap); | |
| 2068 | |
| 2069 // Initialize values | |
| 2070 _got_error = false; | |
| 2071 _conflict = false; | |
| 2072 _max_locals = method()->max_locals(); | |
| 2073 _max_stack = method()->max_stack(); | |
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2074 _has_exceptions = (method()->has_exception_handler()); |
| 0 | 2075 _nof_refval_conflicts = 0; |
| 2076 _init_vars = new GrowableArray<intptr_t>(5); // There are seldom more than 5 init_vars | |
| 2077 _report_result = false; | |
| 2078 _report_result_for_send = false; | |
| 2079 _new_var_map = NULL; | |
| 2080 _ret_adr_tos = new GrowableArray<intptr_t>(5); // 5 seems like a good number; | |
| 2081 _did_rewriting = false; | |
| 2082 _did_relocation = false; | |
| 2083 | |
| 2084 if (TraceNewOopMapGeneration) { | |
| 2085 tty->print("Method name: %s\n", method()->name()->as_C_string()); | |
| 2086 if (Verbose) { | |
| 2087 _method->print_codes(); | |
| 2088 tty->print_cr("Exception table:"); | |
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2089 ExceptionTable excps(method()); |
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2090 for(int i = 0; i < excps.length(); i ++) { |
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2091 tty->print_cr("[%d - %d] -> %d", |
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2092 excps.start_pc(i), excps.end_pc(i), excps.handler_pc(i)); |
| 0 | 2093 } |
| 2094 } | |
| 2095 } | |
| 2096 | |
| 2097 // if no code - do nothing | |
| 2098 // compiler needs info | |
| 2099 if (method()->code_size() == 0 || _max_locals + method()->max_stack() == 0) { | |
| 2100 fill_stackmap_prolog(0); | |
| 2101 fill_stackmap_epilog(); | |
| 2102 return; | |
| 2103 } | |
| 2104 // Step 1: Compute all jump targets and their return value | |
| 2105 if (!_got_error) | |
| 2106 _rt.compute_ret_table(_method); | |
| 2107 | |
| 2108 // Step 2: Find all basic blocks and count GC points | |
| 2109 if (!_got_error) | |
| 2110 mark_bbheaders_and_count_gc_points(); | |
| 2111 | |
| 2112 // Step 3: Calculate stack maps | |
| 2113 if (!_got_error) | |
| 2114 do_interpretation(); | |
| 2115 | |
| 2116 // Step 4:Return results | |
| 2117 if (!_got_error && report_results()) | |
| 2118 report_result(); | |
| 2119 | |
| 2120 if (_got_error) { | |
| 2121 THROW_HANDLE(_exception); | |
| 2122 } | |
| 2123 } | |
| 2124 | |
| 2125 // Error handling methods | |
| 2126 // These methods create an exception for the current thread which is thrown | |
| 2127 // at the bottom of the call stack, when it returns to compute_map(). The | |
| 2128 // _got_error flag controls execution. NOT TODO: The VM exception propagation | |
| 2129 // mechanism using TRAPS/CHECKs could be used here instead but it would need | |
| 2130 // to be added as a parameter to every function and checked for every call. | |
| 2131 // The tons of extra code it would generate didn't seem worth the change. | |
| 2132 // | |
| 2133 void GenerateOopMap::error_work(const char *format, va_list ap) { | |
| 2134 _got_error = true; | |
| 2135 char msg_buffer[512]; | |
| 2136 vsnprintf(msg_buffer, sizeof(msg_buffer), format, ap); | |
| 2137 // Append method name | |
| 2138 char msg_buffer2[512]; | |
| 2139 jio_snprintf(msg_buffer2, sizeof(msg_buffer2), "%s in method %s", msg_buffer, method()->name()->as_C_string()); | |
| 2140 _exception = Exceptions::new_exception(Thread::current(), | |
| 2141 vmSymbols::java_lang_LinkageError(), msg_buffer2); | |
| 2142 } | |
| 2143 | |
| 2144 void GenerateOopMap::report_error(const char *format, ...) { | |
| 2145 va_list ap; | |
| 2146 va_start(ap, format); | |
| 2147 error_work(format, ap); | |
| 2148 } | |
| 2149 | |
| 2150 void GenerateOopMap::verify_error(const char *format, ...) { | |
| 2151 // We do not distinguish between different types of errors for verification | |
| 2152 // errors. Let the verifier give a better message. | |
| 2153 const char *msg = "Illegal class file encountered. Try running with -Xverify:all"; | |
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2154 _got_error = true; |
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2155 // Append method name |
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2156 char msg_buffer2[512]; |
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2157 jio_snprintf(msg_buffer2, sizeof(msg_buffer2), "%s in method %s", msg, |
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2158 method()->name()->as_C_string()); |
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2159 _exception = Exceptions::new_exception(Thread::current(), |
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2160 vmSymbols::java_lang_LinkageError(), msg_buffer2); |
| 0 | 2161 } |
| 2162 | |
| 2163 // | |
| 2164 // Report result opcodes | |
| 2165 // | |
| 2166 void GenerateOopMap::report_result() { | |
| 2167 | |
| 2168 if (TraceNewOopMapGeneration) tty->print_cr("Report result pass"); | |
| 2169 | |
| 2170 // We now want to report the result of the parse | |
| 2171 _report_result = true; | |
| 2172 | |
| 2173 // Prolog code | |
| 2174 fill_stackmap_prolog(_gc_points); | |
| 2175 | |
| 2176 // Mark everything changed, then do one interpretation pass. | |
| 2177 for (int i = 0; i<_bb_count; i++) { | |
| 2178 if (_basic_blocks[i].is_reachable()) { | |
| 2179 _basic_blocks[i].set_changed(true); | |
| 2180 interp_bb(&_basic_blocks[i]); | |
| 2181 } | |
| 2182 } | |
| 2183 | |
| 2184 // Note: Since we are skipping dead-code when we are reporting results, then | |
| 2185 // the no. of encountered gc-points might be fewer than the previously number | |
| 2186 // we have counted. (dead-code is a pain - it should be removed before we get here) | |
| 2187 fill_stackmap_epilog(); | |
| 2188 | |
| 2189 // Report initvars | |
| 2190 fill_init_vars(_init_vars); | |
| 2191 | |
| 2192 _report_result = false; | |
| 2193 } | |
| 2194 | |
| 2195 void GenerateOopMap::result_for_basicblock(int bci) { | |
| 2196 if (TraceNewOopMapGeneration) tty->print_cr("Report result pass for basicblock"); | |
| 2197 | |
| 2198 // We now want to report the result of the parse | |
| 2199 _report_result = true; | |
| 2200 | |
| 2201 // Find basicblock and report results | |
| 2202 BasicBlock* bb = get_basic_block_containing(bci); | |
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2203 guarantee(bb != NULL, "no basic block for bci"); |
| 0 | 2204 assert(bb->is_reachable(), "getting result from unreachable basicblock"); |
| 2205 bb->set_changed(true); | |
| 2206 interp_bb(bb); | |
| 2207 } | |
| 2208 | |
| 2209 // | |
| 2210 // Conflict handling code | |
| 2211 // | |
| 2212 | |
| 2213 void GenerateOopMap::record_refval_conflict(int varNo) { | |
| 2214 assert(varNo>=0 && varNo< _max_locals, "index out of range"); | |
| 2215 | |
| 2216 if (TraceOopMapRewrites) { | |
| 2217 tty->print("### Conflict detected (local no: %d)\n", varNo); | |
| 2218 } | |
| 2219 | |
| 2220 if (!_new_var_map) { | |
| 2221 _new_var_map = NEW_RESOURCE_ARRAY(int, _max_locals); | |
| 2222 for (int k = 0; k < _max_locals; k++) _new_var_map[k] = k; | |
| 2223 } | |
| 2224 | |
| 2225 if ( _new_var_map[varNo] == varNo) { | |
| 2226 // Check if max. number of locals has been reached | |
| 2227 if (_max_locals + _nof_refval_conflicts >= MAX_LOCAL_VARS) { | |
| 2228 report_error("Rewriting exceeded local variable limit"); | |
| 2229 return; | |
| 2230 } | |
| 2231 _new_var_map[varNo] = _max_locals + _nof_refval_conflicts; | |
| 2232 _nof_refval_conflicts++; | |
| 2233 } | |
| 2234 } | |
| 2235 | |
| 2236 void GenerateOopMap::rewrite_refval_conflicts() | |
| 2237 { | |
| 2238 // We can get here two ways: Either a rewrite conflict was detected, or | |
| 2239 // an uninitialize reference was detected. In the second case, we do not | |
| 2240 // do any rewriting, we just want to recompute the reference set with the | |
| 2241 // new information | |
| 2242 | |
| 2243 int nof_conflicts = 0; // Used for debugging only | |
| 2244 | |
| 2245 if ( _nof_refval_conflicts == 0 ) | |
| 2246 return; | |
| 2247 | |
| 2248 // Check if rewrites are allowed in this parse. | |
| 2249 if (!allow_rewrites() && !IgnoreRewrites) { | |
| 2250 fatal("Rewriting method not allowed at this stage"); | |
| 2251 } | |
| 2252 | |
| 2253 | |
| 2254 // This following flag is to tempoary supress rewrites. The locals that might conflict will | |
| 2255 // all be set to contain values. This is UNSAFE - however, until the rewriting has been completely | |
| 2256 // tested it is nice to have. | |
| 2257 if (IgnoreRewrites) { | |
| 2258 if (Verbose) { | |
| 2259 tty->print("rewrites suppressed for local no. "); | |
| 2260 for (int l = 0; l < _max_locals; l++) { | |
| 2261 if (_new_var_map[l] != l) { | |
| 2262 tty->print("%d ", l); | |
| 2263 vars()[l] = CellTypeState::value; | |
| 2264 } | |
| 2265 } | |
| 2266 tty->cr(); | |
| 2267 } | |
| 2268 | |
| 2269 // That was that... | |
| 2270 _new_var_map = NULL; | |
| 2271 _nof_refval_conflicts = 0; | |
| 2272 _conflict = false; | |
| 2273 | |
| 2274 return; | |
| 2275 } | |
| 2276 | |
| 2277 // Tracing flag | |
| 2278 _did_rewriting = true; | |
| 2279 | |
| 2280 if (TraceOopMapRewrites) { | |
| 2281 tty->print_cr("ref/value conflict for method %s - bytecodes are getting rewritten", method()->name()->as_C_string()); | |
| 2282 method()->print(); | |
| 2283 method()->print_codes(); | |
| 2284 } | |
| 2285 | |
| 2286 assert(_new_var_map!=NULL, "nothing to rewrite"); | |
| 2287 assert(_conflict==true, "We should not be here"); | |
| 2288 | |
| 2289 compute_ret_adr_at_TOS(); | |
| 2290 if (!_got_error) { | |
| 2291 for (int k = 0; k < _max_locals && !_got_error; k++) { | |
| 2292 if (_new_var_map[k] != k) { | |
| 2293 if (TraceOopMapRewrites) { | |
| 2294 tty->print_cr("Rewriting: %d -> %d", k, _new_var_map[k]); | |
| 2295 } | |
| 2296 rewrite_refval_conflict(k, _new_var_map[k]); | |
| 2297 if (_got_error) return; | |
| 2298 nof_conflicts++; | |
| 2299 } | |
| 2300 } | |
| 2301 } | |
| 2302 | |
| 2303 assert(nof_conflicts == _nof_refval_conflicts, "sanity check"); | |
| 2304 | |
| 2305 // Adjust the number of locals | |
| 2306 method()->set_max_locals(_max_locals+_nof_refval_conflicts); | |
| 2307 _max_locals += _nof_refval_conflicts; | |
| 2308 | |
| 2309 // That was that... | |
| 2310 _new_var_map = NULL; | |
| 2311 _nof_refval_conflicts = 0; | |
| 2312 } | |
| 2313 | |
| 2314 void GenerateOopMap::rewrite_refval_conflict(int from, int to) { | |
| 2315 bool startOver; | |
| 2316 do { | |
| 2317 // Make sure that the BytecodeStream is constructed in the loop, since | |
| 2318 // during rewriting a new method oop is going to be used, and the next time | |
| 2319 // around we want to use that. | |
| 2320 BytecodeStream bcs(_method); | |
| 2321 startOver = false; | |
| 2322 | |
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2323 while( !startOver && !_got_error && |
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2324 // test bcs in case method changed and it became invalid |
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2325 bcs.next() >=0) { |
| 0 | 2326 startOver = rewrite_refval_conflict_inst(&bcs, from, to); |
| 2327 } | |
| 2328 } while (startOver && !_got_error); | |
| 2329 } | |
| 2330 | |
| 2331 /* If the current instruction is one that uses local variable "from" | |
| 2332 in a ref way, change it to use "to". There's a subtle reason why we | |
| 2333 renumber the ref uses and not the non-ref uses: non-ref uses may be | |
| 2334 2 slots wide (double, long) which would necessitate keeping track of | |
| 2335 whether we should add one or two variables to the method. If the change | |
| 2336 affected the width of some instruction, returns "TRUE"; otherwise, returns "FALSE". | |
| 2337 Another reason for moving ref's value is for solving (addr, ref) conflicts, which | |
| 2338 both uses aload/astore methods. | |
| 2339 */ | |
| 2340 bool GenerateOopMap::rewrite_refval_conflict_inst(BytecodeStream *itr, int from, int to) { | |
| 2341 Bytecodes::Code bc = itr->code(); | |
| 2342 int index; | |
| 2343 int bci = itr->bci(); | |
| 2344 | |
| 2345 if (is_aload(itr, &index) && index == from) { | |
| 2346 if (TraceOopMapRewrites) { | |
| 2347 tty->print_cr("Rewriting aload at bci: %d", bci); | |
| 2348 } | |
| 2349 return rewrite_load_or_store(itr, Bytecodes::_aload, Bytecodes::_aload_0, to); | |
| 2350 } | |
| 2351 | |
| 2352 if (is_astore(itr, &index) && index == from) { | |
| 2353 if (!stack_top_holds_ret_addr(bci)) { | |
| 2354 if (TraceOopMapRewrites) { | |
| 2355 tty->print_cr("Rewriting astore at bci: %d", bci); | |
| 2356 } | |
| 2357 return rewrite_load_or_store(itr, Bytecodes::_astore, Bytecodes::_astore_0, to); | |
| 2358 } else { | |
| 2359 if (TraceOopMapRewrites) { | |
| 2360 tty->print_cr("Supress rewriting of astore at bci: %d", bci); | |
| 2361 } | |
| 2362 } | |
| 2363 } | |
| 2364 | |
| 2365 return false; | |
| 2366 } | |
| 2367 | |
| 2368 // The argument to this method is: | |
| 2369 // bc : Current bytecode | |
| 2370 // bcN : either _aload or _astore | |
| 2371 // bc0 : either _aload_0 or _astore_0 | |
| 2372 bool GenerateOopMap::rewrite_load_or_store(BytecodeStream *bcs, Bytecodes::Code bcN, Bytecodes::Code bc0, unsigned int varNo) { | |
| 2373 assert(bcN == Bytecodes::_astore || bcN == Bytecodes::_aload, "wrong argument (bcN)"); | |
| 2374 assert(bc0 == Bytecodes::_astore_0 || bc0 == Bytecodes::_aload_0, "wrong argument (bc0)"); | |
| 2142 | 2375 int ilen = Bytecodes::length_at(_method(), bcs->bcp()); |
| 0 | 2376 int newIlen; |
| 2377 | |
| 2378 if (ilen == 4) { | |
| 2379 // Original instruction was wide; keep it wide for simplicity | |
| 2380 newIlen = 4; | |
| 2381 } else if (varNo < 4) | |
| 2382 newIlen = 1; | |
| 2383 else if (varNo >= 256) | |
| 2384 newIlen = 4; | |
| 2385 else | |
| 2386 newIlen = 2; | |
| 2387 | |
| 2388 // If we need to relocate in order to patch the byte, we | |
| 2389 // do the patching in a temp. buffer, that is passed to the reloc. | |
| 2390 // The patching of the bytecode stream is then done by the Relocator. | |
| 2391 // This is neccesary, since relocating the instruction at a certain bci, might | |
| 2392 // also relocate that instruction, e.g., if a _goto before it gets widen to a _goto_w. | |
| 2393 // Hence, we do not know which bci to patch after relocation. | |
| 2394 | |
| 2395 assert(newIlen <= 4, "sanity check"); | |
| 2396 u_char inst_buffer[4]; // Max. instruction size is 4. | |
| 2397 address bcp; | |
| 2398 | |
| 2399 if (newIlen != ilen) { | |
| 2400 // Relocation needed do patching in temp. buffer | |
| 2401 bcp = (address)inst_buffer; | |
| 2402 } else { | |
| 2403 bcp = _method->bcp_from(bcs->bci()); | |
| 2404 } | |
| 2405 | |
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2406 // Patch either directly in Method* or in temp. buffer |
| 0 | 2407 if (newIlen == 1) { |
| 2408 assert(varNo < 4, "varNo too large"); | |
| 2409 *bcp = bc0 + varNo; | |
| 2410 } else if (newIlen == 2) { | |
| 2411 assert(varNo < 256, "2-byte index needed!"); | |
| 2412 *(bcp + 0) = bcN; | |
| 2413 *(bcp + 1) = varNo; | |
| 2414 } else { | |
| 2415 assert(newIlen == 4, "Wrong instruction length"); | |
| 2416 *(bcp + 0) = Bytecodes::_wide; | |
| 2417 *(bcp + 1) = bcN; | |
| 2418 Bytes::put_Java_u2(bcp+2, varNo); | |
| 2419 } | |
| 2420 | |
| 2421 if (newIlen != ilen) { | |
| 2422 expand_current_instr(bcs->bci(), ilen, newIlen, inst_buffer); | |
| 2423 } | |
| 2424 | |
| 2425 | |
| 2426 return (newIlen != ilen); | |
| 2427 } | |
| 2428 | |
| 2429 class RelocCallback : public RelocatorListener { | |
| 2430 private: | |
| 2431 GenerateOopMap* _gom; | |
| 2432 public: | |
| 2433 RelocCallback(GenerateOopMap* gom) { _gom = gom; }; | |
| 2434 | |
| 2435 // Callback method | |
| 2436 virtual void relocated(int bci, int delta, int new_code_length) { | |
| 2437 _gom->update_basic_blocks (bci, delta, new_code_length); | |
| 2438 _gom->update_ret_adr_at_TOS(bci, delta); | |
| 2439 _gom->_rt.update_ret_table (bci, delta); | |
| 2440 } | |
| 2441 }; | |
| 2442 | |
| 2443 // Returns true if expanding was succesful. Otherwise, reports an error and | |
| 2444 // returns false. | |
| 2445 void GenerateOopMap::expand_current_instr(int bci, int ilen, int newIlen, u_char inst_buffer[]) { | |
| 2446 Thread *THREAD = Thread::current(); // Could really have TRAPS argument. | |
| 2447 RelocCallback rcb(this); | |
| 2448 Relocator rc(_method, &rcb); | |
| 2449 methodHandle m= rc.insert_space_at(bci, newIlen, inst_buffer, THREAD); | |
| 2450 if (m.is_null() || HAS_PENDING_EXCEPTION) { | |
| 2451 report_error("could not rewrite method - exception occurred or bytecode buffer overflow"); | |
| 2452 return; | |
| 2453 } | |
| 2454 | |
| 2455 // Relocator returns a new method oop. | |
| 2456 _did_relocation = true; | |
| 2457 _method = m; | |
| 2458 } | |
| 2459 | |
| 2460 | |
| 2461 bool GenerateOopMap::is_astore(BytecodeStream *itr, int *index) { | |
| 2462 Bytecodes::Code bc = itr->code(); | |
| 2463 switch(bc) { | |
| 2464 case Bytecodes::_astore_0: | |
| 2465 case Bytecodes::_astore_1: | |
| 2466 case Bytecodes::_astore_2: | |
| 2467 case Bytecodes::_astore_3: | |
| 2468 *index = bc - Bytecodes::_astore_0; | |
| 2469 return true; | |
| 2470 case Bytecodes::_astore: | |
| 2471 *index = itr->get_index(); | |
| 2472 return true; | |
| 2473 } | |
| 2474 return false; | |
| 2475 } | |
| 2476 | |
| 2477 bool GenerateOopMap::is_aload(BytecodeStream *itr, int *index) { | |
| 2478 Bytecodes::Code bc = itr->code(); | |
| 2479 switch(bc) { | |
| 2480 case Bytecodes::_aload_0: | |
| 2481 case Bytecodes::_aload_1: | |
| 2482 case Bytecodes::_aload_2: | |
| 2483 case Bytecodes::_aload_3: | |
| 2484 *index = bc - Bytecodes::_aload_0; | |
| 2485 return true; | |
| 2486 | |
| 2487 case Bytecodes::_aload: | |
| 2488 *index = itr->get_index(); | |
| 2489 return true; | |
| 2490 } | |
| 2491 return false; | |
| 2492 } | |
| 2493 | |
| 2494 | |
| 2495 // Return true iff the top of the operand stack holds a return address at | |
| 2496 // the current instruction | |
| 2497 bool GenerateOopMap::stack_top_holds_ret_addr(int bci) { | |
| 2498 for(int i = 0; i < _ret_adr_tos->length(); i++) { | |
| 2499 if (_ret_adr_tos->at(i) == bci) | |
| 2500 return true; | |
| 2501 } | |
| 2502 | |
| 2503 return false; | |
| 2504 } | |
| 2505 | |
| 2506 void GenerateOopMap::compute_ret_adr_at_TOS() { | |
| 2507 assert(_ret_adr_tos != NULL, "must be initialized"); | |
| 2508 _ret_adr_tos->clear(); | |
| 2509 | |
| 2510 for (int i = 0; i < bb_count(); i++) { | |
| 2511 BasicBlock* bb = &_basic_blocks[i]; | |
| 2512 | |
| 2513 // Make sure to only check basicblocks that are reachable | |
| 2514 if (bb->is_reachable()) { | |
| 2515 | |
| 2516 // For each Basic block we check all instructions | |
| 2517 BytecodeStream bcs(_method); | |
| 2518 bcs.set_interval(bb->_bci, next_bb_start_pc(bb)); | |
| 2519 | |
| 2520 restore_state(bb); | |
| 2521 | |
| 2522 while (bcs.next()>=0 && !_got_error) { | |
| 2523 // TDT: should this be is_good_address() ? | |
| 2524 if (_stack_top > 0 && stack()[_stack_top-1].is_address()) { | |
| 2525 _ret_adr_tos->append(bcs.bci()); | |
| 2526 if (TraceNewOopMapGeneration) { | |
| 2527 tty->print_cr("Ret_adr TOS at bci: %d", bcs.bci()); | |
| 2528 } | |
| 2529 } | |
| 2530 interp1(&bcs); | |
| 2531 } | |
| 2532 } | |
| 2533 } | |
| 2534 } | |
| 2535 | |
| 2536 void GenerateOopMap::update_ret_adr_at_TOS(int bci, int delta) { | |
| 2537 for(int i = 0; i < _ret_adr_tos->length(); i++) { | |
| 2538 int v = _ret_adr_tos->at(i); | |
| 2539 if (v > bci) _ret_adr_tos->at_put(i, v + delta); | |
| 2540 } | |
| 2541 } | |
| 2542 | |
| 2543 // =================================================================== | |
| 2544 | |
| 2545 #ifndef PRODUCT | |
| 2546 int ResolveOopMapConflicts::_nof_invocations = 0; | |
| 2547 int ResolveOopMapConflicts::_nof_rewrites = 0; | |
| 2548 int ResolveOopMapConflicts::_nof_relocations = 0; | |
| 2549 #endif | |
| 2550 | |
| 2551 methodHandle ResolveOopMapConflicts::do_potential_rewrite(TRAPS) { | |
| 2552 compute_map(CHECK_(methodHandle())); | |
| 2553 | |
| 2554 #ifndef PRODUCT | |
| 2555 // Tracking and statistics | |
| 2556 if (PrintRewrites) { | |
| 2557 _nof_invocations++; | |
| 2558 if (did_rewriting()) { | |
| 2559 _nof_rewrites++; | |
| 2560 if (did_relocation()) _nof_relocations++; | |
| 2561 tty->print("Method was rewritten %s: ", (did_relocation()) ? "and relocated" : ""); | |
| 2562 method()->print_value(); tty->cr(); | |
| 2563 tty->print_cr("Cand.: %d rewrts: %d (%d%%) reloc.: %d (%d%%)", | |
| 2564 _nof_invocations, | |
| 2565 _nof_rewrites, (_nof_rewrites * 100) / _nof_invocations, | |
| 2566 _nof_relocations, (_nof_relocations * 100) / _nof_invocations); | |
| 2567 } | |
| 2568 } | |
| 2569 #endif | |
| 2570 return methodHandle(THREAD, method()); | |
| 2571 } |