Mercurial > hg > truffle
annotate src/share/vm/opto/parse1.cpp @ 1070:87b2fdd4bf98
6892079: live value must not be garbage failure after fix for 6854812
Reviewed-by: kvn
| author | never |
|---|---|
| date | Wed, 11 Nov 2009 23:39:17 -0800 |
| parents | 3a2aa26bdc58 |
| children | b2b6a9bf6238 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 844 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_parse1.cpp.incl" | |
| 27 | |
| 28 // Static array so we can figure out which bytecodes stop us from compiling | |
| 29 // the most. Some of the non-static variables are needed in bytecodeInfo.cpp | |
| 30 // and eventually should be encapsulated in a proper class (gri 8/18/98). | |
| 31 | |
|
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32 int nodes_created = 0; |
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33 int methods_parsed = 0; |
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34 int methods_seen = 0; |
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35 int blocks_parsed = 0; |
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36 int blocks_seen = 0; |
| 0 | 37 |
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38 int explicit_null_checks_inserted = 0; |
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39 int explicit_null_checks_elided = 0; |
| 0 | 40 int all_null_checks_found = 0, implicit_null_checks = 0; |
| 41 int implicit_null_throws = 0; | |
| 42 | |
| 43 int reclaim_idx = 0; | |
| 44 int reclaim_in = 0; | |
| 45 int reclaim_node = 0; | |
| 46 | |
| 47 #ifndef PRODUCT | |
| 48 bool Parse::BytecodeParseHistogram::_initialized = false; | |
| 49 uint Parse::BytecodeParseHistogram::_bytecodes_parsed [Bytecodes::number_of_codes]; | |
| 50 uint Parse::BytecodeParseHistogram::_nodes_constructed[Bytecodes::number_of_codes]; | |
| 51 uint Parse::BytecodeParseHistogram::_nodes_transformed[Bytecodes::number_of_codes]; | |
| 52 uint Parse::BytecodeParseHistogram::_new_values [Bytecodes::number_of_codes]; | |
| 53 #endif | |
| 54 | |
| 55 //------------------------------print_statistics------------------------------- | |
| 56 #ifndef PRODUCT | |
| 57 void Parse::print_statistics() { | |
| 58 tty->print_cr("--- Compiler Statistics ---"); | |
| 59 tty->print("Methods seen: %d Methods parsed: %d", methods_seen, methods_parsed); | |
| 60 tty->print(" Nodes created: %d", nodes_created); | |
| 61 tty->cr(); | |
| 62 if (methods_seen != methods_parsed) | |
| 63 tty->print_cr("Reasons for parse failures (NOT cumulative):"); | |
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64 tty->print_cr("Blocks parsed: %d Blocks seen: %d", blocks_parsed, blocks_seen); |
| 0 | 65 |
| 66 if( explicit_null_checks_inserted ) | |
| 67 tty->print_cr("%d original NULL checks - %d elided (%2d%%); optimizer leaves %d,", explicit_null_checks_inserted, explicit_null_checks_elided, (100*explicit_null_checks_elided)/explicit_null_checks_inserted, all_null_checks_found); | |
| 68 if( all_null_checks_found ) | |
| 69 tty->print_cr("%d made implicit (%2d%%)", implicit_null_checks, | |
| 70 (100*implicit_null_checks)/all_null_checks_found); | |
| 71 if( implicit_null_throws ) | |
| 72 tty->print_cr("%d implicit null exceptions at runtime", | |
| 73 implicit_null_throws); | |
| 74 | |
| 75 if( PrintParseStatistics && BytecodeParseHistogram::initialized() ) { | |
| 76 BytecodeParseHistogram::print(); | |
| 77 } | |
| 78 } | |
| 79 #endif | |
| 80 | |
| 81 //------------------------------ON STACK REPLACEMENT--------------------------- | |
| 82 | |
| 83 // Construct a node which can be used to get incoming state for | |
| 84 // on stack replacement. | |
| 85 Node *Parse::fetch_interpreter_state(int index, | |
| 86 BasicType bt, | |
| 87 Node *local_addrs, | |
| 88 Node *local_addrs_base) { | |
| 89 Node *mem = memory(Compile::AliasIdxRaw); | |
| 90 Node *adr = basic_plus_adr( local_addrs_base, local_addrs, -index*wordSize ); | |
| 91 | |
| 92 // Very similar to LoadNode::make, except we handle un-aligned longs and | |
| 93 // doubles on Sparc. Intel can handle them just fine directly. | |
| 94 Node *l; | |
| 95 switch( bt ) { // Signature is flattened | |
| 96 case T_INT: l = new (C, 3) LoadINode( 0, mem, adr, TypeRawPtr::BOTTOM ); break; | |
| 97 case T_FLOAT: l = new (C, 3) LoadFNode( 0, mem, adr, TypeRawPtr::BOTTOM ); break; | |
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98 case T_ADDRESS: l = new (C, 3) LoadPNode( 0, mem, adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ); break; |
| 0 | 99 case T_OBJECT: l = new (C, 3) LoadPNode( 0, mem, adr, TypeRawPtr::BOTTOM, TypeInstPtr::BOTTOM ); break; |
| 100 case T_LONG: | |
| 101 case T_DOUBLE: { | |
| 102 // Since arguments are in reverse order, the argument address 'adr' | |
| 103 // refers to the back half of the long/double. Recompute adr. | |
| 104 adr = basic_plus_adr( local_addrs_base, local_addrs, -(index+1)*wordSize ); | |
| 105 if( Matcher::misaligned_doubles_ok ) { | |
| 106 l = (bt == T_DOUBLE) | |
| 107 ? (Node*)new (C, 3) LoadDNode( 0, mem, adr, TypeRawPtr::BOTTOM ) | |
| 108 : (Node*)new (C, 3) LoadLNode( 0, mem, adr, TypeRawPtr::BOTTOM ); | |
| 109 } else { | |
| 110 l = (bt == T_DOUBLE) | |
| 111 ? (Node*)new (C, 3) LoadD_unalignedNode( 0, mem, adr, TypeRawPtr::BOTTOM ) | |
| 112 : (Node*)new (C, 3) LoadL_unalignedNode( 0, mem, adr, TypeRawPtr::BOTTOM ); | |
| 113 } | |
| 114 break; | |
| 115 } | |
| 116 default: ShouldNotReachHere(); | |
| 117 } | |
| 118 return _gvn.transform(l); | |
| 119 } | |
| 120 | |
| 121 // Helper routine to prevent the interpreter from handing | |
| 122 // unexpected typestate to an OSR method. | |
| 123 // The Node l is a value newly dug out of the interpreter frame. | |
| 124 // The type is the type predicted by ciTypeFlow. Note that it is | |
| 125 // not a general type, but can only come from Type::get_typeflow_type. | |
| 126 // The safepoint is a map which will feed an uncommon trap. | |
| 127 Node* Parse::check_interpreter_type(Node* l, const Type* type, | |
| 128 SafePointNode* &bad_type_exit) { | |
| 129 | |
| 130 const TypeOopPtr* tp = type->isa_oopptr(); | |
| 131 | |
| 132 // TypeFlow may assert null-ness if a type appears unloaded. | |
| 133 if (type == TypePtr::NULL_PTR || | |
| 134 (tp != NULL && !tp->klass()->is_loaded())) { | |
| 135 // Value must be null, not a real oop. | |
| 136 Node* chk = _gvn.transform( new (C, 3) CmpPNode(l, null()) ); | |
| 137 Node* tst = _gvn.transform( new (C, 2) BoolNode(chk, BoolTest::eq) ); | |
| 138 IfNode* iff = create_and_map_if(control(), tst, PROB_MAX, COUNT_UNKNOWN); | |
| 139 set_control(_gvn.transform( new (C, 1) IfTrueNode(iff) )); | |
| 140 Node* bad_type = _gvn.transform( new (C, 1) IfFalseNode(iff) ); | |
| 141 bad_type_exit->control()->add_req(bad_type); | |
| 142 l = null(); | |
| 143 } | |
| 144 | |
| 145 // Typeflow can also cut off paths from the CFG, based on | |
| 146 // types which appear unloaded, or call sites which appear unlinked. | |
| 147 // When paths are cut off, values at later merge points can rise | |
| 148 // toward more specific classes. Make sure these specific classes | |
| 149 // are still in effect. | |
| 150 if (tp != NULL && tp->klass() != C->env()->Object_klass()) { | |
| 151 // TypeFlow asserted a specific object type. Value must have that type. | |
| 152 Node* bad_type_ctrl = NULL; | |
| 153 l = gen_checkcast(l, makecon(TypeKlassPtr::make(tp->klass())), &bad_type_ctrl); | |
| 154 bad_type_exit->control()->add_req(bad_type_ctrl); | |
| 155 } | |
| 156 | |
| 157 BasicType bt_l = _gvn.type(l)->basic_type(); | |
| 158 BasicType bt_t = type->basic_type(); | |
| 159 assert(_gvn.type(l)->higher_equal(type), "must constrain OSR typestate"); | |
| 160 return l; | |
| 161 } | |
| 162 | |
| 163 // Helper routine which sets up elements of the initial parser map when | |
| 164 // performing a parse for on stack replacement. Add values into map. | |
| 165 // The only parameter contains the address of a interpreter arguments. | |
| 166 void Parse::load_interpreter_state(Node* osr_buf) { | |
| 167 int index; | |
| 168 int max_locals = jvms()->loc_size(); | |
| 169 int max_stack = jvms()->stk_size(); | |
| 170 | |
| 171 | |
| 172 // Mismatch between method and jvms can occur since map briefly held | |
| 173 // an OSR entry state (which takes up one RawPtr word). | |
| 174 assert(max_locals == method()->max_locals(), "sanity"); | |
| 175 assert(max_stack >= method()->max_stack(), "sanity"); | |
| 176 assert((int)jvms()->endoff() == TypeFunc::Parms + max_locals + max_stack, "sanity"); | |
| 177 assert((int)jvms()->endoff() == (int)map()->req(), "sanity"); | |
| 178 | |
| 179 // Find the start block. | |
| 180 Block* osr_block = start_block(); | |
| 181 assert(osr_block->start() == osr_bci(), "sanity"); | |
| 182 | |
| 183 // Set initial BCI. | |
| 184 set_parse_bci(osr_block->start()); | |
| 185 | |
| 186 // Set initial stack depth. | |
| 187 set_sp(osr_block->start_sp()); | |
| 188 | |
| 189 // Check bailouts. We currently do not perform on stack replacement | |
| 190 // of loops in catch blocks or loops which branch with a non-empty stack. | |
| 191 if (sp() != 0) { | |
| 192 C->record_method_not_compilable("OSR starts with non-empty stack"); | |
| 193 return; | |
| 194 } | |
| 195 // Do not OSR inside finally clauses: | |
| 196 if (osr_block->has_trap_at(osr_block->start())) { | |
| 197 C->record_method_not_compilable("OSR starts with an immediate trap"); | |
| 198 return; | |
| 199 } | |
| 200 | |
| 201 // Commute monitors from interpreter frame to compiler frame. | |
| 202 assert(jvms()->monitor_depth() == 0, "should be no active locks at beginning of osr"); | |
| 203 int mcnt = osr_block->flow()->monitor_count(); | |
| 204 Node *monitors_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals+mcnt*2-1)*wordSize); | |
| 205 for (index = 0; index < mcnt; index++) { | |
| 206 // Make a BoxLockNode for the monitor. | |
| 207 Node *box = _gvn.transform(new (C, 1) BoxLockNode(next_monitor())); | |
| 208 | |
| 209 | |
| 210 // Displaced headers and locked objects are interleaved in the | |
| 211 // temp OSR buffer. We only copy the locked objects out here. | |
| 212 // Fetch the locked object from the OSR temp buffer and copy to our fastlock node. | |
| 213 Node *lock_object = fetch_interpreter_state(index*2, T_OBJECT, monitors_addr, osr_buf); | |
| 214 // Try and copy the displaced header to the BoxNode | |
| 215 Node *displaced_hdr = fetch_interpreter_state((index*2) + 1, T_ADDRESS, monitors_addr, osr_buf); | |
| 216 | |
| 217 | |
| 218 store_to_memory(control(), box, displaced_hdr, T_ADDRESS, Compile::AliasIdxRaw); | |
| 219 | |
| 220 // Build a bogus FastLockNode (no code will be generated) and push the | |
| 221 // monitor into our debug info. | |
| 222 const FastLockNode *flock = _gvn.transform(new (C, 3) FastLockNode( 0, lock_object, box ))->as_FastLock(); | |
| 223 map()->push_monitor(flock); | |
| 224 | |
| 225 // If the lock is our method synchronization lock, tuck it away in | |
| 226 // _sync_lock for return and rethrow exit paths. | |
| 227 if (index == 0 && method()->is_synchronized()) { | |
| 228 _synch_lock = flock; | |
| 229 } | |
| 230 } | |
| 231 | |
| 991 | 232 // Use the raw liveness computation to make sure that unexpected |
| 233 // values don't propagate into the OSR frame. | |
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234 MethodLivenessResult live_locals = method()->liveness_at_bci(osr_bci()); |
| 0 | 235 if (!live_locals.is_valid()) { |
| 236 // Degenerate or breakpointed method. | |
| 237 C->record_method_not_compilable("OSR in empty or breakpointed method"); | |
| 238 return; | |
| 239 } | |
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240 MethodLivenessResult raw_live_locals = method()->raw_liveness_at_bci(osr_bci()); |
| 0 | 241 |
| 242 // Extract the needed locals from the interpreter frame. | |
| 243 Node *locals_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals-1)*wordSize); | |
| 244 | |
| 245 // find all the locals that the interpreter thinks contain live oops | |
| 246 const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci()); | |
| 247 for (index = 0; index < max_locals; index++) { | |
| 248 | |
| 249 if (!live_locals.at(index)) { | |
| 250 continue; | |
| 251 } | |
| 252 | |
| 253 const Type *type = osr_block->local_type_at(index); | |
| 254 | |
| 255 if (type->isa_oopptr() != NULL) { | |
| 256 | |
| 257 // 6403625: Verify that the interpreter oopMap thinks that the oop is live | |
| 258 // else we might load a stale oop if the MethodLiveness disagrees with the | |
| 259 // result of the interpreter. If the interpreter says it is dead we agree | |
| 260 // by making the value go to top. | |
| 261 // | |
| 262 | |
| 263 if (!live_oops.at(index)) { | |
| 264 if (C->log() != NULL) { | |
| 265 C->log()->elem("OSR_mismatch local_index='%d'",index); | |
| 266 } | |
| 267 set_local(index, null()); | |
| 268 // and ignore it for the loads | |
| 269 continue; | |
| 270 } | |
| 271 } | |
| 272 | |
| 273 // Filter out TOP, HALF, and BOTTOM. (Cf. ensure_phi.) | |
| 274 if (type == Type::TOP || type == Type::HALF) { | |
| 275 continue; | |
| 276 } | |
| 277 // If the type falls to bottom, then this must be a local that | |
| 278 // is mixing ints and oops or some such. Forcing it to top | |
| 279 // makes it go dead. | |
| 280 if (type == Type::BOTTOM) { | |
| 281 continue; | |
| 282 } | |
| 283 // Construct code to access the appropriate local. | |
| 284 Node *value = fetch_interpreter_state(index, type->basic_type(), locals_addr, osr_buf); | |
| 285 set_local(index, value); | |
| 286 } | |
| 287 | |
| 288 // Extract the needed stack entries from the interpreter frame. | |
| 289 for (index = 0; index < sp(); index++) { | |
| 290 const Type *type = osr_block->stack_type_at(index); | |
| 291 if (type != Type::TOP) { | |
| 292 // Currently the compiler bails out when attempting to on stack replace | |
| 293 // at a bci with a non-empty stack. We should not reach here. | |
| 294 ShouldNotReachHere(); | |
| 295 } | |
| 296 } | |
| 297 | |
| 298 // End the OSR migration | |
| 299 make_runtime_call(RC_LEAF, OptoRuntime::osr_end_Type(), | |
| 300 CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end), | |
| 301 "OSR_migration_end", TypeRawPtr::BOTTOM, | |
| 302 osr_buf); | |
| 303 | |
| 304 // Now that the interpreter state is loaded, make sure it will match | |
| 305 // at execution time what the compiler is expecting now: | |
| 306 SafePointNode* bad_type_exit = clone_map(); | |
| 307 bad_type_exit->set_control(new (C, 1) RegionNode(1)); | |
| 308 | |
| 309 for (index = 0; index < max_locals; index++) { | |
| 310 if (stopped()) break; | |
| 311 Node* l = local(index); | |
| 312 if (l->is_top()) continue; // nothing here | |
| 313 const Type *type = osr_block->local_type_at(index); | |
| 314 if (type->isa_oopptr() != NULL) { | |
| 315 if (!live_oops.at(index)) { | |
| 316 // skip type check for dead oops | |
| 317 continue; | |
| 318 } | |
| 319 } | |
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320 if (type->basic_type() == T_ADDRESS && !raw_live_locals.at(index)) { |
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321 // Skip type check for dead address locals |
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322 continue; |
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323 } |
| 0 | 324 set_local(index, check_interpreter_type(l, type, bad_type_exit)); |
| 325 } | |
| 326 | |
| 327 for (index = 0; index < sp(); index++) { | |
| 328 if (stopped()) break; | |
| 329 Node* l = stack(index); | |
| 330 if (l->is_top()) continue; // nothing here | |
| 331 const Type *type = osr_block->stack_type_at(index); | |
| 332 set_stack(index, check_interpreter_type(l, type, bad_type_exit)); | |
| 333 } | |
| 334 | |
| 335 if (bad_type_exit->control()->req() > 1) { | |
| 336 // Build an uncommon trap here, if any inputs can be unexpected. | |
| 337 bad_type_exit->set_control(_gvn.transform( bad_type_exit->control() )); | |
| 338 record_for_igvn(bad_type_exit->control()); | |
| 339 SafePointNode* types_are_good = map(); | |
| 340 set_map(bad_type_exit); | |
| 341 // The unexpected type happens because a new edge is active | |
| 342 // in the CFG, which typeflow had previously ignored. | |
| 343 // E.g., Object x = coldAtFirst() && notReached()? "str": new Integer(123). | |
| 344 // This x will be typed as Integer if notReached is not yet linked. | |
| 345 uncommon_trap(Deoptimization::Reason_unreached, | |
| 346 Deoptimization::Action_reinterpret); | |
| 347 set_map(types_are_good); | |
| 348 } | |
| 349 } | |
| 350 | |
| 351 //------------------------------Parse------------------------------------------ | |
| 352 // Main parser constructor. | |
| 353 Parse::Parse(JVMState* caller, ciMethod* parse_method, float expected_uses) | |
| 354 : _exits(caller) | |
| 355 { | |
| 356 // Init some variables | |
| 357 _caller = caller; | |
| 358 _method = parse_method; | |
| 359 _expected_uses = expected_uses; | |
| 360 _depth = 1 + (caller->has_method() ? caller->depth() : 0); | |
| 361 _wrote_final = false; | |
| 362 _entry_bci = InvocationEntryBci; | |
| 363 _tf = NULL; | |
| 364 _block = NULL; | |
| 365 debug_only(_block_count = -1); | |
| 366 debug_only(_blocks = (Block*)-1); | |
| 367 #ifndef PRODUCT | |
| 368 if (PrintCompilation || PrintOpto) { | |
| 369 // Make sure I have an inline tree, so I can print messages about it. | |
| 370 JVMState* ilt_caller = is_osr_parse() ? caller->caller() : caller; | |
| 371 InlineTree::find_subtree_from_root(C->ilt(), ilt_caller, parse_method, true); | |
| 372 } | |
| 373 _max_switch_depth = 0; | |
| 374 _est_switch_depth = 0; | |
| 375 #endif | |
| 376 | |
| 377 _tf = TypeFunc::make(method()); | |
| 378 _iter.reset_to_method(method()); | |
| 379 _flow = method()->get_flow_analysis(); | |
| 380 if (_flow->failing()) { | |
| 381 C->record_method_not_compilable_all_tiers(_flow->failure_reason()); | |
| 382 } | |
| 383 | |
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384 #ifndef PRODUCT |
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385 if (_flow->has_irreducible_entry()) { |
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386 C->set_parsed_irreducible_loop(true); |
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387 } |
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388 #endif |
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389 |
| 0 | 390 if (_expected_uses <= 0) { |
| 391 _prof_factor = 1; | |
| 392 } else { | |
| 393 float prof_total = parse_method->interpreter_invocation_count(); | |
| 394 if (prof_total <= _expected_uses) { | |
| 395 _prof_factor = 1; | |
| 396 } else { | |
| 397 _prof_factor = _expected_uses / prof_total; | |
| 398 } | |
| 399 } | |
| 400 | |
| 401 CompileLog* log = C->log(); | |
| 402 if (log != NULL) { | |
| 403 log->begin_head("parse method='%d' uses='%g'", | |
| 404 log->identify(parse_method), expected_uses); | |
| 405 if (depth() == 1 && C->is_osr_compilation()) { | |
| 406 log->print(" osr_bci='%d'", C->entry_bci()); | |
| 407 } | |
| 408 log->stamp(); | |
| 409 log->end_head(); | |
| 410 } | |
| 411 | |
| 412 // Accumulate deoptimization counts. | |
| 413 // (The range_check and store_check counts are checked elsewhere.) | |
| 414 ciMethodData* md = method()->method_data(); | |
| 415 for (uint reason = 0; reason < md->trap_reason_limit(); reason++) { | |
| 416 uint md_count = md->trap_count(reason); | |
| 417 if (md_count != 0) { | |
| 418 if (md_count == md->trap_count_limit()) | |
| 419 md_count += md->overflow_trap_count(); | |
| 420 uint total_count = C->trap_count(reason); | |
| 421 uint old_count = total_count; | |
| 422 total_count += md_count; | |
| 423 // Saturate the add if it overflows. | |
| 424 if (total_count < old_count || total_count < md_count) | |
| 425 total_count = (uint)-1; | |
| 426 C->set_trap_count(reason, total_count); | |
| 427 if (log != NULL) | |
| 428 log->elem("observe trap='%s' count='%d' total='%d'", | |
| 429 Deoptimization::trap_reason_name(reason), | |
| 430 md_count, total_count); | |
| 431 } | |
| 432 } | |
| 433 // Accumulate total sum of decompilations, also. | |
| 434 C->set_decompile_count(C->decompile_count() + md->decompile_count()); | |
| 435 | |
| 436 _count_invocations = C->do_count_invocations(); | |
| 437 _method_data_update = C->do_method_data_update(); | |
| 438 | |
| 439 if (log != NULL && method()->has_exception_handlers()) { | |
| 440 log->elem("observe that='has_exception_handlers'"); | |
| 441 } | |
| 442 | |
| 443 assert(method()->can_be_compiled(), "Can not parse this method, cutout earlier"); | |
| 444 assert(method()->has_balanced_monitors(), "Can not parse unbalanced monitors, cutout earlier"); | |
| 445 | |
| 446 // Always register dependence if JVMTI is enabled, because | |
| 447 // either breakpoint setting or hotswapping of methods may | |
| 448 // cause deoptimization. | |
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449 if (C->env()->jvmti_can_hotswap_or_post_breakpoint()) { |
| 0 | 450 C->dependencies()->assert_evol_method(method()); |
| 451 } | |
| 452 | |
| 453 methods_seen++; | |
| 454 | |
| 455 // Do some special top-level things. | |
| 456 if (depth() == 1 && C->is_osr_compilation()) { | |
| 457 _entry_bci = C->entry_bci(); | |
| 458 _flow = method()->get_osr_flow_analysis(osr_bci()); | |
| 459 if (_flow->failing()) { | |
| 460 C->record_method_not_compilable(_flow->failure_reason()); | |
| 461 #ifndef PRODUCT | |
| 462 if (PrintOpto && (Verbose || WizardMode)) { | |
| 463 tty->print_cr("OSR @%d type flow bailout: %s", _entry_bci, _flow->failure_reason()); | |
| 464 if (Verbose) { | |
| 465 method()->print_oop(); | |
| 466 method()->print_codes(); | |
| 467 _flow->print(); | |
| 468 } | |
| 469 } | |
| 470 #endif | |
| 471 } | |
| 472 _tf = C->tf(); // the OSR entry type is different | |
| 473 } | |
| 474 | |
| 475 #ifdef ASSERT | |
| 476 if (depth() == 1) { | |
| 477 assert(C->is_osr_compilation() == this->is_osr_parse(), "OSR in sync"); | |
| 478 if (C->tf() != tf()) { | |
| 479 MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag); | |
| 480 assert(C->env()->system_dictionary_modification_counter_changed(), | |
| 481 "Must invalidate if TypeFuncs differ"); | |
| 482 } | |
| 483 } else { | |
| 484 assert(!this->is_osr_parse(), "no recursive OSR"); | |
| 485 } | |
| 486 #endif | |
| 487 | |
| 488 methods_parsed++; | |
| 489 #ifndef PRODUCT | |
| 490 // add method size here to guarantee that inlined methods are added too | |
| 491 if (TimeCompiler) | |
| 492 _total_bytes_compiled += method()->code_size(); | |
| 493 | |
| 494 show_parse_info(); | |
| 495 #endif | |
| 496 | |
| 497 if (failing()) { | |
| 498 if (log) log->done("parse"); | |
| 499 return; | |
| 500 } | |
| 501 | |
| 502 gvn().set_type(root(), root()->bottom_type()); | |
| 503 gvn().transform(top()); | |
| 504 | |
| 505 // Import the results of the ciTypeFlow. | |
| 506 init_blocks(); | |
| 507 | |
| 508 // Merge point for all normal exits | |
| 509 build_exits(); | |
| 510 | |
| 511 // Setup the initial JVM state map. | |
| 512 SafePointNode* entry_map = create_entry_map(); | |
| 513 | |
| 514 // Check for bailouts during map initialization | |
| 515 if (failing() || entry_map == NULL) { | |
| 516 if (log) log->done("parse"); | |
| 517 return; | |
| 518 } | |
| 519 | |
| 520 Node_Notes* caller_nn = C->default_node_notes(); | |
| 521 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls. | |
| 522 if (DebugInlinedCalls || depth() == 1) { | |
| 523 C->set_default_node_notes(make_node_notes(caller_nn)); | |
| 524 } | |
| 525 | |
| 526 if (is_osr_parse()) { | |
| 527 Node* osr_buf = entry_map->in(TypeFunc::Parms+0); | |
| 528 entry_map->set_req(TypeFunc::Parms+0, top()); | |
| 529 set_map(entry_map); | |
| 530 load_interpreter_state(osr_buf); | |
| 531 } else { | |
| 532 set_map(entry_map); | |
| 533 do_method_entry(); | |
| 534 } | |
| 535 | |
| 536 // Check for bailouts during method entry. | |
| 537 if (failing()) { | |
| 538 if (log) log->done("parse"); | |
| 539 C->set_default_node_notes(caller_nn); | |
| 540 return; | |
| 541 } | |
| 542 | |
| 543 entry_map = map(); // capture any changes performed by method setup code | |
| 544 assert(jvms()->endoff() == map()->req(), "map matches JVMS layout"); | |
| 545 | |
| 546 // We begin parsing as if we have just encountered a jump to the | |
| 547 // method entry. | |
| 548 Block* entry_block = start_block(); | |
| 549 assert(entry_block->start() == (is_osr_parse() ? osr_bci() : 0), ""); | |
| 550 set_map_clone(entry_map); | |
| 551 merge_common(entry_block, entry_block->next_path_num()); | |
| 552 | |
| 553 #ifndef PRODUCT | |
| 554 BytecodeParseHistogram *parse_histogram_obj = new (C->env()->arena()) BytecodeParseHistogram(this, C); | |
| 555 set_parse_histogram( parse_histogram_obj ); | |
| 556 #endif | |
| 557 | |
| 558 // Parse all the basic blocks. | |
| 559 do_all_blocks(); | |
| 560 | |
| 561 C->set_default_node_notes(caller_nn); | |
| 562 | |
| 563 // Check for bailouts during conversion to graph | |
| 564 if (failing()) { | |
| 565 if (log) log->done("parse"); | |
| 566 return; | |
| 567 } | |
| 568 | |
| 569 // Fix up all exiting control flow. | |
| 570 set_map(entry_map); | |
| 571 do_exits(); | |
| 572 | |
| 573 if (log) log->done("parse nodes='%d' memory='%d'", | |
| 574 C->unique(), C->node_arena()->used()); | |
| 575 } | |
| 576 | |
| 577 //---------------------------do_all_blocks------------------------------------- | |
| 578 void Parse::do_all_blocks() { | |
|
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579 bool has_irreducible = flow()->has_irreducible_entry(); |
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580 |
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581 // Walk over all blocks in Reverse Post-Order. |
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582 while (true) { |
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583 bool progress = false; |
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584 for (int rpo = 0; rpo < block_count(); rpo++) { |
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585 Block* block = rpo_at(rpo); |
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586 |
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587 if (block->is_parsed()) continue; |
| 0 | 588 |
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589 if (!block->is_merged()) { |
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590 // Dead block, no state reaches this block |
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591 continue; |
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592 } |
| 0 | 593 |
|
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594 // Prepare to parse this block. |
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595 load_state_from(block); |
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596 |
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597 if (stopped()) { |
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598 // Block is dead. |
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599 continue; |
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600 } |
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601 |
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602 blocks_parsed++; |
| 0 | 603 |
|
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604 progress = true; |
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605 if (block->is_loop_head() || block->is_handler() || has_irreducible && !block->is_ready()) { |
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606 // Not all preds have been parsed. We must build phis everywhere. |
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607 // (Note that dead locals do not get phis built, ever.) |
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608 ensure_phis_everywhere(); |
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609 |
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610 // Leave behind an undisturbed copy of the map, for future merges. |
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611 set_map(clone_map()); |
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612 } |
| 0 | 613 |
|
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614 if (control()->is_Region() && !block->is_loop_head() && !has_irreducible && !block->is_handler()) { |
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615 // In the absence of irreducible loops, the Region and Phis |
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616 // associated with a merge that doesn't involve a backedge can |
| 605 | 617 // be simplified now since the RPO parsing order guarantees |
|
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618 // that any path which was supposed to reach here has already |
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619 // been parsed or must be dead. |
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620 Node* c = control(); |
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621 Node* result = _gvn.transform_no_reclaim(control()); |
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622 if (c != result && TraceOptoParse) { |
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623 tty->print_cr("Block #%d replace %d with %d", block->rpo(), c->_idx, result->_idx); |
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624 } |
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625 if (result != top()) { |
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626 record_for_igvn(result); |
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627 } |
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628 } |
| 0 | 629 |
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630 // Parse the block. |
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631 do_one_block(); |
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632 |
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633 // Check for bailouts. |
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634 if (failing()) return; |
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635 } |
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636 |
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637 // with irreducible loops multiple passes might be necessary to parse everything |
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638 if (!has_irreducible || !progress) { |
| 0 | 639 break; |
| 640 } | |
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641 } |
| 0 | 642 |
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643 blocks_seen += block_count(); |
| 0 | 644 |
| 645 #ifndef PRODUCT | |
| 646 // Make sure there are no half-processed blocks remaining. | |
| 647 // Every remaining unprocessed block is dead and may be ignored now. | |
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648 for (int rpo = 0; rpo < block_count(); rpo++) { |
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649 Block* block = rpo_at(rpo); |
| 0 | 650 if (!block->is_parsed()) { |
| 651 if (TraceOptoParse) { | |
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652 tty->print_cr("Skipped dead block %d at bci:%d", rpo, block->start()); |
| 0 | 653 } |
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654 assert(!block->is_merged(), "no half-processed blocks"); |
| 0 | 655 } |
| 656 } | |
| 657 #endif | |
| 658 } | |
| 659 | |
| 660 //-------------------------------build_exits---------------------------------- | |
| 661 // Build normal and exceptional exit merge points. | |
| 662 void Parse::build_exits() { | |
| 663 // make a clone of caller to prevent sharing of side-effects | |
| 664 _exits.set_map(_exits.clone_map()); | |
| 665 _exits.clean_stack(_exits.sp()); | |
| 666 _exits.sync_jvms(); | |
| 667 | |
| 668 RegionNode* region = new (C, 1) RegionNode(1); | |
| 669 record_for_igvn(region); | |
| 670 gvn().set_type_bottom(region); | |
| 671 _exits.set_control(region); | |
| 672 | |
| 673 // Note: iophi and memphi are not transformed until do_exits. | |
| 674 Node* iophi = new (C, region->req()) PhiNode(region, Type::ABIO); | |
| 675 Node* memphi = new (C, region->req()) PhiNode(region, Type::MEMORY, TypePtr::BOTTOM); | |
| 676 _exits.set_i_o(iophi); | |
| 677 _exits.set_all_memory(memphi); | |
| 678 | |
| 679 // Add a return value to the exit state. (Do not push it yet.) | |
| 680 if (tf()->range()->cnt() > TypeFunc::Parms) { | |
| 681 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms); | |
| 682 // Don't "bind" an unloaded return klass to the ret_phi. If the klass | |
| 683 // becomes loaded during the subsequent parsing, the loaded and unloaded | |
| 684 // types will not join when we transform and push in do_exits(). | |
| 685 const TypeOopPtr* ret_oop_type = ret_type->isa_oopptr(); | |
| 686 if (ret_oop_type && !ret_oop_type->klass()->is_loaded()) { | |
| 687 ret_type = TypeOopPtr::BOTTOM; | |
| 688 } | |
| 689 int ret_size = type2size[ret_type->basic_type()]; | |
| 690 Node* ret_phi = new (C, region->req()) PhiNode(region, ret_type); | |
| 691 _exits.ensure_stack(ret_size); | |
| 692 assert((int)(tf()->range()->cnt() - TypeFunc::Parms) == ret_size, "good tf range"); | |
| 693 assert(method()->return_type()->size() == ret_size, "tf agrees w/ method"); | |
| 694 _exits.set_argument(0, ret_phi); // here is where the parser finds it | |
| 695 // Note: ret_phi is not yet pushed, until do_exits. | |
| 696 } | |
| 697 } | |
| 698 | |
| 699 | |
| 700 //----------------------------build_start_state------------------------------- | |
| 701 // Construct a state which contains only the incoming arguments from an | |
| 702 // unknown caller. The method & bci will be NULL & InvocationEntryBci. | |
| 703 JVMState* Compile::build_start_state(StartNode* start, const TypeFunc* tf) { | |
| 704 int arg_size = tf->domain()->cnt(); | |
| 705 int max_size = MAX2(arg_size, (int)tf->range()->cnt()); | |
| 706 JVMState* jvms = new (this) JVMState(max_size - TypeFunc::Parms); | |
| 707 SafePointNode* map = new (this, max_size) SafePointNode(max_size, NULL); | |
| 708 record_for_igvn(map); | |
| 709 assert(arg_size == TypeFunc::Parms + (is_osr_compilation() ? 1 : method()->arg_size()), "correct arg_size"); | |
| 710 Node_Notes* old_nn = default_node_notes(); | |
| 711 if (old_nn != NULL && has_method()) { | |
| 712 Node_Notes* entry_nn = old_nn->clone(this); | |
| 713 JVMState* entry_jvms = new(this) JVMState(method(), old_nn->jvms()); | |
| 714 entry_jvms->set_offsets(0); | |
| 715 entry_jvms->set_bci(entry_bci()); | |
| 716 entry_nn->set_jvms(entry_jvms); | |
| 717 set_default_node_notes(entry_nn); | |
| 718 } | |
| 719 uint i; | |
| 720 for (i = 0; i < (uint)arg_size; i++) { | |
| 721 Node* parm = initial_gvn()->transform(new (this, 1) ParmNode(start, i)); | |
| 722 map->init_req(i, parm); | |
| 723 // Record all these guys for later GVN. | |
| 724 record_for_igvn(parm); | |
| 725 } | |
| 726 for (; i < map->req(); i++) { | |
| 727 map->init_req(i, top()); | |
| 728 } | |
| 729 assert(jvms->argoff() == TypeFunc::Parms, "parser gets arguments here"); | |
| 730 set_default_node_notes(old_nn); | |
| 731 map->set_jvms(jvms); | |
| 732 jvms->set_map(map); | |
| 733 return jvms; | |
| 734 } | |
| 735 | |
| 736 //-----------------------------make_node_notes--------------------------------- | |
| 737 Node_Notes* Parse::make_node_notes(Node_Notes* caller_nn) { | |
| 738 if (caller_nn == NULL) return NULL; | |
| 739 Node_Notes* nn = caller_nn->clone(C); | |
| 740 JVMState* caller_jvms = nn->jvms(); | |
| 741 JVMState* jvms = new (C) JVMState(method(), caller_jvms); | |
| 742 jvms->set_offsets(0); | |
| 743 jvms->set_bci(_entry_bci); | |
| 744 nn->set_jvms(jvms); | |
| 745 return nn; | |
| 746 } | |
| 747 | |
| 748 | |
| 749 //--------------------------return_values-------------------------------------- | |
| 750 void Compile::return_values(JVMState* jvms) { | |
| 751 GraphKit kit(jvms); | |
| 752 Node* ret = new (this, TypeFunc::Parms) ReturnNode(TypeFunc::Parms, | |
| 753 kit.control(), | |
| 754 kit.i_o(), | |
| 755 kit.reset_memory(), | |
| 756 kit.frameptr(), | |
| 757 kit.returnadr()); | |
| 758 // Add zero or 1 return values | |
| 759 int ret_size = tf()->range()->cnt() - TypeFunc::Parms; | |
| 760 if (ret_size > 0) { | |
| 761 kit.inc_sp(-ret_size); // pop the return value(s) | |
| 762 kit.sync_jvms(); | |
| 763 ret->add_req(kit.argument(0)); | |
| 764 // Note: The second dummy edge is not needed by a ReturnNode. | |
| 765 } | |
| 766 // bind it to root | |
| 767 root()->add_req(ret); | |
| 768 record_for_igvn(ret); | |
| 769 initial_gvn()->transform_no_reclaim(ret); | |
| 770 } | |
| 771 | |
| 772 //------------------------rethrow_exceptions----------------------------------- | |
| 773 // Bind all exception states in the list into a single RethrowNode. | |
| 774 void Compile::rethrow_exceptions(JVMState* jvms) { | |
| 775 GraphKit kit(jvms); | |
| 776 if (!kit.has_exceptions()) return; // nothing to generate | |
| 777 // Load my combined exception state into the kit, with all phis transformed: | |
| 778 SafePointNode* ex_map = kit.combine_and_pop_all_exception_states(); | |
| 779 Node* ex_oop = kit.use_exception_state(ex_map); | |
| 780 RethrowNode* exit = new (this, TypeFunc::Parms + 1) RethrowNode(kit.control(), | |
| 781 kit.i_o(), kit.reset_memory(), | |
| 782 kit.frameptr(), kit.returnadr(), | |
| 783 // like a return but with exception input | |
| 784 ex_oop); | |
| 785 // bind to root | |
| 786 root()->add_req(exit); | |
| 787 record_for_igvn(exit); | |
| 788 initial_gvn()->transform_no_reclaim(exit); | |
| 789 } | |
| 790 | |
| 791 bool Parse::can_rerun_bytecode() { | |
| 792 switch (bc()) { | |
| 793 case Bytecodes::_ldc: | |
| 794 case Bytecodes::_ldc_w: | |
| 795 case Bytecodes::_ldc2_w: | |
| 796 case Bytecodes::_getfield: | |
| 797 case Bytecodes::_putfield: | |
| 798 case Bytecodes::_getstatic: | |
| 799 case Bytecodes::_putstatic: | |
| 800 case Bytecodes::_arraylength: | |
| 801 case Bytecodes::_baload: | |
| 802 case Bytecodes::_caload: | |
| 803 case Bytecodes::_iaload: | |
| 804 case Bytecodes::_saload: | |
| 805 case Bytecodes::_faload: | |
| 806 case Bytecodes::_aaload: | |
| 807 case Bytecodes::_laload: | |
| 808 case Bytecodes::_daload: | |
| 809 case Bytecodes::_bastore: | |
| 810 case Bytecodes::_castore: | |
| 811 case Bytecodes::_iastore: | |
| 812 case Bytecodes::_sastore: | |
| 813 case Bytecodes::_fastore: | |
| 814 case Bytecodes::_aastore: | |
| 815 case Bytecodes::_lastore: | |
| 816 case Bytecodes::_dastore: | |
| 817 case Bytecodes::_irem: | |
| 818 case Bytecodes::_idiv: | |
| 819 case Bytecodes::_lrem: | |
| 820 case Bytecodes::_ldiv: | |
| 821 case Bytecodes::_frem: | |
| 822 case Bytecodes::_fdiv: | |
| 823 case Bytecodes::_drem: | |
| 824 case Bytecodes::_ddiv: | |
| 825 case Bytecodes::_checkcast: | |
| 826 case Bytecodes::_instanceof: | |
| 827 case Bytecodes::_athrow: | |
| 828 case Bytecodes::_anewarray: | |
| 829 case Bytecodes::_newarray: | |
| 830 case Bytecodes::_multianewarray: | |
| 831 case Bytecodes::_new: | |
| 832 case Bytecodes::_monitorenter: // can re-run initial null check, only | |
| 833 case Bytecodes::_return: | |
| 834 return true; | |
| 835 break; | |
| 836 | |
| 837 case Bytecodes::_invokestatic: | |
|
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838 case Bytecodes::_invokedynamic: |
| 0 | 839 case Bytecodes::_invokespecial: |
| 840 case Bytecodes::_invokevirtual: | |
| 841 case Bytecodes::_invokeinterface: | |
| 842 return false; | |
| 843 break; | |
| 844 | |
| 845 default: | |
| 846 assert(false, "unexpected bytecode produced an exception"); | |
| 847 return true; | |
| 848 } | |
| 849 } | |
| 850 | |
| 851 //---------------------------do_exceptions------------------------------------- | |
| 852 // Process exceptions arising from the current bytecode. | |
| 853 // Send caught exceptions to the proper handler within this method. | |
| 854 // Unhandled exceptions feed into _exit. | |
| 855 void Parse::do_exceptions() { | |
| 856 if (!has_exceptions()) return; | |
| 857 | |
| 858 if (failing()) { | |
| 859 // Pop them all off and throw them away. | |
| 860 while (pop_exception_state() != NULL) ; | |
| 861 return; | |
| 862 } | |
| 863 | |
| 864 // Make sure we can classify this bytecode if we need to. | |
| 865 debug_only(can_rerun_bytecode()); | |
| 866 | |
| 867 PreserveJVMState pjvms(this, false); | |
| 868 | |
| 869 SafePointNode* ex_map; | |
| 870 while ((ex_map = pop_exception_state()) != NULL) { | |
| 871 if (!method()->has_exception_handlers()) { | |
| 872 // Common case: Transfer control outward. | |
| 873 // Doing it this early allows the exceptions to common up | |
| 874 // even between adjacent method calls. | |
| 875 throw_to_exit(ex_map); | |
| 876 } else { | |
| 877 // Have to look at the exception first. | |
| 878 assert(stopped(), "catch_inline_exceptions trashes the map"); | |
| 879 catch_inline_exceptions(ex_map); | |
| 880 stop_and_kill_map(); // we used up this exception state; kill it | |
| 881 } | |
| 882 } | |
| 883 | |
| 884 // We now return to our regularly scheduled program: | |
| 885 } | |
| 886 | |
| 887 //---------------------------throw_to_exit------------------------------------- | |
| 888 // Merge the given map into an exception exit from this method. | |
| 889 // The exception exit will handle any unlocking of receiver. | |
| 890 // The ex_oop must be saved within the ex_map, unlike merge_exception. | |
| 891 void Parse::throw_to_exit(SafePointNode* ex_map) { | |
| 892 // Pop the JVMS to (a copy of) the caller. | |
| 893 GraphKit caller; | |
| 894 caller.set_map_clone(_caller->map()); | |
| 895 caller.set_bci(_caller->bci()); | |
| 896 caller.set_sp(_caller->sp()); | |
| 897 // Copy out the standard machine state: | |
| 898 for (uint i = 0; i < TypeFunc::Parms; i++) { | |
| 899 caller.map()->set_req(i, ex_map->in(i)); | |
| 900 } | |
| 901 // ...and the exception: | |
| 902 Node* ex_oop = saved_ex_oop(ex_map); | |
| 903 SafePointNode* caller_ex_map = caller.make_exception_state(ex_oop); | |
| 904 // Finally, collect the new exception state in my exits: | |
| 905 _exits.add_exception_state(caller_ex_map); | |
| 906 } | |
| 907 | |
| 908 //------------------------------do_exits--------------------------------------- | |
| 909 void Parse::do_exits() { | |
| 910 set_parse_bci(InvocationEntryBci); | |
| 911 | |
| 912 // Now peephole on the return bits | |
| 913 Node* region = _exits.control(); | |
| 914 _exits.set_control(gvn().transform(region)); | |
| 915 | |
| 916 Node* iophi = _exits.i_o(); | |
| 917 _exits.set_i_o(gvn().transform(iophi)); | |
| 918 | |
| 919 if (wrote_final()) { | |
| 920 // This method (which must be a constructor by the rules of Java) | |
| 921 // wrote a final. The effects of all initializations must be | |
| 922 // committed to memory before any code after the constructor | |
| 923 // publishes the reference to the newly constructor object. | |
| 924 // Rather than wait for the publication, we simply block the | |
| 925 // writes here. Rather than put a barrier on only those writes | |
| 926 // which are required to complete, we force all writes to complete. | |
| 927 // | |
| 928 // "All bets are off" unless the first publication occurs after a | |
| 929 // normal return from the constructor. We do not attempt to detect | |
| 930 // such unusual early publications. But no barrier is needed on | |
| 931 // exceptional returns, since they cannot publish normally. | |
| 932 // | |
| 933 _exits.insert_mem_bar(Op_MemBarRelease); | |
| 934 #ifndef PRODUCT | |
| 935 if (PrintOpto && (Verbose || WizardMode)) { | |
| 936 method()->print_name(); | |
| 937 tty->print_cr(" writes finals and needs a memory barrier"); | |
| 938 } | |
| 939 #endif | |
| 940 } | |
| 941 | |
| 942 for (MergeMemStream mms(_exits.merged_memory()); mms.next_non_empty(); ) { | |
| 943 // transform each slice of the original memphi: | |
| 944 mms.set_memory(_gvn.transform(mms.memory())); | |
| 945 } | |
| 946 | |
| 947 if (tf()->range()->cnt() > TypeFunc::Parms) { | |
| 948 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms); | |
| 949 Node* ret_phi = _gvn.transform( _exits.argument(0) ); | |
| 950 assert(_exits.control()->is_top() || !_gvn.type(ret_phi)->empty(), "return value must be well defined"); | |
| 951 _exits.push_node(ret_type->basic_type(), ret_phi); | |
| 952 } | |
| 953 | |
| 954 // Note: Logic for creating and optimizing the ReturnNode is in Compile. | |
| 955 | |
| 956 // Unlock along the exceptional paths. | |
| 957 // This is done late so that we can common up equivalent exceptions | |
| 958 // (e.g., null checks) arising from multiple points within this method. | |
| 959 // See GraphKit::add_exception_state, which performs the commoning. | |
| 960 bool do_synch = method()->is_synchronized() && GenerateSynchronizationCode; | |
| 961 | |
| 962 // record exit from a method if compiled while Dtrace is turned on. | |
|
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963 if (do_synch || C->env()->dtrace_method_probes()) { |
| 0 | 964 // First move the exception list out of _exits: |
| 965 GraphKit kit(_exits.transfer_exceptions_into_jvms()); | |
| 966 SafePointNode* normal_map = kit.map(); // keep this guy safe | |
| 967 // Now re-collect the exceptions into _exits: | |
| 968 SafePointNode* ex_map; | |
| 969 while ((ex_map = kit.pop_exception_state()) != NULL) { | |
| 970 Node* ex_oop = kit.use_exception_state(ex_map); | |
| 971 // Force the exiting JVM state to have this method at InvocationEntryBci. | |
| 972 // The exiting JVM state is otherwise a copy of the calling JVMS. | |
| 973 JVMState* caller = kit.jvms(); | |
| 974 JVMState* ex_jvms = caller->clone_shallow(C); | |
| 975 ex_jvms->set_map(kit.clone_map()); | |
| 976 ex_jvms->map()->set_jvms(ex_jvms); | |
| 977 ex_jvms->set_bci( InvocationEntryBci); | |
| 978 kit.set_jvms(ex_jvms); | |
| 979 if (do_synch) { | |
| 980 // Add on the synchronized-method box/object combo | |
| 981 kit.map()->push_monitor(_synch_lock); | |
| 982 // Unlock! | |
| 983 kit.shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node()); | |
| 984 } | |
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985 if (C->env()->dtrace_method_probes()) { |
| 0 | 986 kit.make_dtrace_method_exit(method()); |
| 987 } | |
| 988 // Done with exception-path processing. | |
| 989 ex_map = kit.make_exception_state(ex_oop); | |
| 990 assert(ex_jvms->same_calls_as(ex_map->jvms()), "sanity"); | |
| 991 // Pop the last vestige of this method: | |
| 992 ex_map->set_jvms(caller->clone_shallow(C)); | |
| 993 ex_map->jvms()->set_map(ex_map); | |
| 994 _exits.push_exception_state(ex_map); | |
| 995 } | |
| 996 assert(_exits.map() == normal_map, "keep the same return state"); | |
| 997 } | |
| 998 | |
| 999 { | |
| 1000 // Capture very early exceptions (receiver null checks) from caller JVMS | |
| 1001 GraphKit caller(_caller); | |
| 1002 SafePointNode* ex_map; | |
| 1003 while ((ex_map = caller.pop_exception_state()) != NULL) { | |
| 1004 _exits.add_exception_state(ex_map); | |
| 1005 } | |
| 1006 } | |
| 1007 } | |
| 1008 | |
| 1009 //-----------------------------create_entry_map------------------------------- | |
| 1010 // Initialize our parser map to contain the types at method entry. | |
| 1011 // For OSR, the map contains a single RawPtr parameter. | |
| 1012 // Initial monitor locking for sync. methods is performed by do_method_entry. | |
| 1013 SafePointNode* Parse::create_entry_map() { | |
| 1014 // Check for really stupid bail-out cases. | |
| 1015 uint len = TypeFunc::Parms + method()->max_locals() + method()->max_stack(); | |
| 1016 if (len >= 32760) { | |
| 1017 C->record_method_not_compilable_all_tiers("too many local variables"); | |
| 1018 return NULL; | |
| 1019 } | |
| 1020 | |
| 1021 // If this is an inlined method, we may have to do a receiver null check. | |
| 1022 if (_caller->has_method() && is_normal_parse() && !method()->is_static()) { | |
| 1023 GraphKit kit(_caller); | |
| 1024 kit.null_check_receiver(method()); | |
| 1025 _caller = kit.transfer_exceptions_into_jvms(); | |
| 1026 if (kit.stopped()) { | |
| 1027 _exits.add_exception_states_from(_caller); | |
| 1028 _exits.set_jvms(_caller); | |
| 1029 return NULL; | |
| 1030 } | |
| 1031 } | |
| 1032 | |
| 1033 assert(method() != NULL, "parser must have a method"); | |
| 1034 | |
| 1035 // Create an initial safepoint to hold JVM state during parsing | |
| 1036 JVMState* jvms = new (C) JVMState(method(), _caller->has_method() ? _caller : NULL); | |
| 1037 set_map(new (C, len) SafePointNode(len, jvms)); | |
| 1038 jvms->set_map(map()); | |
| 1039 record_for_igvn(map()); | |
| 1040 assert(jvms->endoff() == len, "correct jvms sizing"); | |
| 1041 | |
| 1042 SafePointNode* inmap = _caller->map(); | |
| 1043 assert(inmap != NULL, "must have inmap"); | |
| 1044 | |
| 1045 uint i; | |
| 1046 | |
| 1047 // Pass thru the predefined input parameters. | |
| 1048 for (i = 0; i < TypeFunc::Parms; i++) { | |
| 1049 map()->init_req(i, inmap->in(i)); | |
| 1050 } | |
| 1051 | |
| 1052 if (depth() == 1) { | |
| 1053 assert(map()->memory()->Opcode() == Op_Parm, ""); | |
| 1054 // Insert the memory aliasing node | |
| 1055 set_all_memory(reset_memory()); | |
| 1056 } | |
| 1057 assert(merged_memory(), ""); | |
| 1058 | |
| 1059 // Now add the locals which are initially bound to arguments: | |
| 1060 uint arg_size = tf()->domain()->cnt(); | |
| 1061 ensure_stack(arg_size - TypeFunc::Parms); // OSR methods have funny args | |
| 1062 for (i = TypeFunc::Parms; i < arg_size; i++) { | |
| 1063 map()->init_req(i, inmap->argument(_caller, i - TypeFunc::Parms)); | |
| 1064 } | |
| 1065 | |
| 1066 // Clear out the rest of the map (locals and stack) | |
| 1067 for (i = arg_size; i < len; i++) { | |
| 1068 map()->init_req(i, top()); | |
| 1069 } | |
| 1070 | |
| 1071 SafePointNode* entry_map = stop(); | |
| 1072 return entry_map; | |
| 1073 } | |
| 1074 | |
| 1075 //-----------------------------do_method_entry-------------------------------- | |
| 1076 // Emit any code needed in the pseudo-block before BCI zero. | |
| 1077 // The main thing to do is lock the receiver of a synchronized method. | |
| 1078 void Parse::do_method_entry() { | |
| 1079 set_parse_bci(InvocationEntryBci); // Pseudo-BCP | |
| 1080 set_sp(0); // Java Stack Pointer | |
| 1081 | |
| 1082 NOT_PRODUCT( count_compiled_calls(true/*at_method_entry*/, false/*is_inline*/); ) | |
| 1083 | |
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1084 if (C->env()->dtrace_method_probes()) { |
| 0 | 1085 make_dtrace_method_entry(method()); |
| 1086 } | |
| 1087 | |
| 1088 // If the method is synchronized, we need to construct a lock node, attach | |
| 1089 // it to the Start node, and pin it there. | |
| 1090 if (method()->is_synchronized()) { | |
| 1091 // Insert a FastLockNode right after the Start which takes as arguments | |
| 1092 // the current thread pointer, the "this" pointer & the address of the | |
| 1093 // stack slot pair used for the lock. The "this" pointer is a projection | |
| 1094 // off the start node, but the locking spot has to be constructed by | |
| 1095 // creating a ConLNode of 0, and boxing it with a BoxLockNode. The BoxLockNode | |
| 1096 // becomes the second argument to the FastLockNode call. The | |
| 1097 // FastLockNode becomes the new control parent to pin it to the start. | |
| 1098 | |
| 1099 // Setup Object Pointer | |
| 1100 Node *lock_obj = NULL; | |
| 1101 if(method()->is_static()) { | |
| 1102 ciInstance* mirror = _method->holder()->java_mirror(); | |
| 1103 const TypeInstPtr *t_lock = TypeInstPtr::make(mirror); | |
| 1104 lock_obj = makecon(t_lock); | |
| 1105 } else { // Else pass the "this" pointer, | |
| 1106 lock_obj = local(0); // which is Parm0 from StartNode | |
| 1107 } | |
| 1108 // Clear out dead values from the debug info. | |
| 1109 kill_dead_locals(); | |
| 1110 // Build the FastLockNode | |
| 1111 _synch_lock = shared_lock(lock_obj); | |
| 1112 } | |
| 1113 | |
| 1114 if (depth() == 1) { | |
| 1115 increment_and_test_invocation_counter(Tier2CompileThreshold); | |
| 1116 } | |
| 1117 } | |
| 1118 | |
| 1119 //------------------------------init_blocks------------------------------------ | |
| 1120 // Initialize our parser map to contain the types/monitors at method entry. | |
| 1121 void Parse::init_blocks() { | |
| 1122 // Create the blocks. | |
| 1123 _block_count = flow()->block_count(); | |
| 1124 _blocks = NEW_RESOURCE_ARRAY(Block, _block_count); | |
| 1125 Copy::zero_to_bytes(_blocks, sizeof(Block)*_block_count); | |
| 1126 | |
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1127 int rpo; |
| 0 | 1128 |
| 1129 // Initialize the structs. | |
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1130 for (rpo = 0; rpo < block_count(); rpo++) { |
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1131 Block* block = rpo_at(rpo); |
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1132 block->init_node(this, rpo); |
| 0 | 1133 } |
| 1134 | |
| 1135 // Collect predecessor and successor information. | |
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1136 for (rpo = 0; rpo < block_count(); rpo++) { |
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1137 Block* block = rpo_at(rpo); |
| 0 | 1138 block->init_graph(this); |
| 1139 } | |
| 1140 } | |
| 1141 | |
| 1142 //-------------------------------init_node------------------------------------- | |
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1143 void Parse::Block::init_node(Parse* outer, int rpo) { |
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1144 _flow = outer->flow()->rpo_at(rpo); |
| 0 | 1145 _pred_count = 0; |
| 1146 _preds_parsed = 0; | |
| 1147 _count = 0; | |
| 1148 assert(pred_count() == 0 && preds_parsed() == 0, "sanity"); | |
| 1149 assert(!(is_merged() || is_parsed() || is_handler()), "sanity"); | |
| 1150 assert(_live_locals.size() == 0, "sanity"); | |
| 1151 | |
| 1152 // entry point has additional predecessor | |
| 1153 if (flow()->is_start()) _pred_count++; | |
| 1154 assert(flow()->is_start() == (this == outer->start_block()), ""); | |
| 1155 } | |
| 1156 | |
| 1157 //-------------------------------init_graph------------------------------------ | |
| 1158 void Parse::Block::init_graph(Parse* outer) { | |
| 1159 // Create the successor list for this parser block. | |
| 1160 GrowableArray<ciTypeFlow::Block*>* tfs = flow()->successors(); | |
| 1161 GrowableArray<ciTypeFlow::Block*>* tfe = flow()->exceptions(); | |
| 1162 int ns = tfs->length(); | |
| 1163 int ne = tfe->length(); | |
| 1164 _num_successors = ns; | |
| 1165 _all_successors = ns+ne; | |
| 1166 _successors = (ns+ne == 0) ? NULL : NEW_RESOURCE_ARRAY(Block*, ns+ne); | |
| 1167 int p = 0; | |
| 1168 for (int i = 0; i < ns+ne; i++) { | |
| 1169 ciTypeFlow::Block* tf2 = (i < ns) ? tfs->at(i) : tfe->at(i-ns); | |
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1170 Block* block2 = outer->rpo_at(tf2->rpo()); |
| 0 | 1171 _successors[i] = block2; |
| 1172 | |
| 1173 // Accumulate pred info for the other block, too. | |
| 1174 if (i < ns) { | |
| 1175 block2->_pred_count++; | |
| 1176 } else { | |
| 1177 block2->_is_handler = true; | |
| 1178 } | |
| 1179 | |
| 1180 #ifdef ASSERT | |
| 1181 // A block's successors must be distinguishable by BCI. | |
| 1182 // That is, no bytecode is allowed to branch to two different | |
| 1183 // clones of the same code location. | |
| 1184 for (int j = 0; j < i; j++) { | |
| 1185 Block* block1 = _successors[j]; | |
| 1186 if (block1 == block2) continue; // duplicates are OK | |
| 1187 assert(block1->start() != block2->start(), "successors have unique bcis"); | |
| 1188 } | |
| 1189 #endif | |
| 1190 } | |
| 1191 | |
| 1192 // Note: We never call next_path_num along exception paths, so they | |
| 1193 // never get processed as "ready". Also, the input phis of exception | |
| 1194 // handlers get specially processed, so that | |
| 1195 } | |
| 1196 | |
| 1197 //---------------------------successor_for_bci--------------------------------- | |
| 1198 Parse::Block* Parse::Block::successor_for_bci(int bci) { | |
| 1199 for (int i = 0; i < all_successors(); i++) { | |
| 1200 Block* block2 = successor_at(i); | |
| 1201 if (block2->start() == bci) return block2; | |
| 1202 } | |
| 1203 // We can actually reach here if ciTypeFlow traps out a block | |
| 1204 // due to an unloaded class, and concurrently with compilation the | |
| 1205 // class is then loaded, so that a later phase of the parser is | |
| 1206 // able to see more of the bytecode CFG. Or, the flow pass and | |
| 1207 // the parser can have a minor difference of opinion about executability | |
| 1208 // of bytecodes. For example, "obj.field = null" is executable even | |
| 1209 // if the field's type is an unloaded class; the flow pass used to | |
| 1210 // make a trap for such code. | |
| 1211 return NULL; | |
| 1212 } | |
| 1213 | |
| 1214 | |
| 1215 //-----------------------------stack_type_at----------------------------------- | |
| 1216 const Type* Parse::Block::stack_type_at(int i) const { | |
| 1217 return get_type(flow()->stack_type_at(i)); | |
| 1218 } | |
| 1219 | |
| 1220 | |
| 1221 //-----------------------------local_type_at----------------------------------- | |
| 1222 const Type* Parse::Block::local_type_at(int i) const { | |
| 1223 // Make dead locals fall to bottom. | |
| 1224 if (_live_locals.size() == 0) { | |
| 1225 MethodLivenessResult live_locals = flow()->outer()->method()->liveness_at_bci(start()); | |
| 1226 // This bitmap can be zero length if we saw a breakpoint. | |
| 1227 // In such cases, pretend they are all live. | |
| 1228 ((Block*)this)->_live_locals = live_locals; | |
| 1229 } | |
| 1230 if (_live_locals.size() > 0 && !_live_locals.at(i)) | |
| 1231 return Type::BOTTOM; | |
| 1232 | |
| 1233 return get_type(flow()->local_type_at(i)); | |
| 1234 } | |
| 1235 | |
| 1236 | |
| 1237 #ifndef PRODUCT | |
| 1238 | |
| 1239 //----------------------------name_for_bc-------------------------------------- | |
| 1240 // helper method for BytecodeParseHistogram | |
| 1241 static const char* name_for_bc(int i) { | |
| 1242 return Bytecodes::is_defined(i) ? Bytecodes::name(Bytecodes::cast(i)) : "xxxunusedxxx"; | |
| 1243 } | |
| 1244 | |
| 1245 //----------------------------BytecodeParseHistogram------------------------------------ | |
| 1246 Parse::BytecodeParseHistogram::BytecodeParseHistogram(Parse *p, Compile *c) { | |
| 1247 _parser = p; | |
| 1248 _compiler = c; | |
| 1249 if( ! _initialized ) { _initialized = true; reset(); } | |
| 1250 } | |
| 1251 | |
| 1252 //----------------------------current_count------------------------------------ | |
| 1253 int Parse::BytecodeParseHistogram::current_count(BPHType bph_type) { | |
| 1254 switch( bph_type ) { | |
| 1255 case BPH_transforms: { return _parser->gvn().made_progress(); } | |
| 1256 case BPH_values: { return _parser->gvn().made_new_values(); } | |
| 1257 default: { ShouldNotReachHere(); return 0; } | |
| 1258 } | |
| 1259 } | |
| 1260 | |
| 1261 //----------------------------initialized-------------------------------------- | |
| 1262 bool Parse::BytecodeParseHistogram::initialized() { return _initialized; } | |
| 1263 | |
| 1264 //----------------------------reset-------------------------------------------- | |
| 1265 void Parse::BytecodeParseHistogram::reset() { | |
| 1266 int i = Bytecodes::number_of_codes; | |
| 1267 while (i-- > 0) { _bytecodes_parsed[i] = 0; _nodes_constructed[i] = 0; _nodes_transformed[i] = 0; _new_values[i] = 0; } | |
| 1268 } | |
| 1269 | |
| 1270 //----------------------------set_initial_state-------------------------------- | |
| 1271 // Record info when starting to parse one bytecode | |
| 1272 void Parse::BytecodeParseHistogram::set_initial_state( Bytecodes::Code bc ) { | |
| 1273 if( PrintParseStatistics && !_parser->is_osr_parse() ) { | |
| 1274 _initial_bytecode = bc; | |
| 1275 _initial_node_count = _compiler->unique(); | |
| 1276 _initial_transforms = current_count(BPH_transforms); | |
| 1277 _initial_values = current_count(BPH_values); | |
| 1278 } | |
| 1279 } | |
| 1280 | |
| 1281 //----------------------------record_change-------------------------------- | |
| 1282 // Record results of parsing one bytecode | |
| 1283 void Parse::BytecodeParseHistogram::record_change() { | |
| 1284 if( PrintParseStatistics && !_parser->is_osr_parse() ) { | |
| 1285 ++_bytecodes_parsed[_initial_bytecode]; | |
| 1286 _nodes_constructed [_initial_bytecode] += (_compiler->unique() - _initial_node_count); | |
| 1287 _nodes_transformed [_initial_bytecode] += (current_count(BPH_transforms) - _initial_transforms); | |
| 1288 _new_values [_initial_bytecode] += (current_count(BPH_values) - _initial_values); | |
| 1289 } | |
| 1290 } | |
| 1291 | |
| 1292 | |
| 1293 //----------------------------print-------------------------------------------- | |
| 1294 void Parse::BytecodeParseHistogram::print(float cutoff) { | |
| 1295 ResourceMark rm; | |
| 1296 // print profile | |
| 1297 int total = 0; | |
| 1298 int i = 0; | |
| 1299 for( i = 0; i < Bytecodes::number_of_codes; ++i ) { total += _bytecodes_parsed[i]; } | |
| 1300 int abs_sum = 0; | |
| 1301 tty->cr(); //0123456789012345678901234567890123456789012345678901234567890123456789 | |
| 1302 tty->print_cr("Histogram of %d parsed bytecodes:", total); | |
| 1303 if( total == 0 ) { return; } | |
| 1304 tty->cr(); | |
| 1305 tty->print_cr("absolute: count of compiled bytecodes of this type"); | |
| 1306 tty->print_cr("relative: percentage contribution to compiled nodes"); | |
| 1307 tty->print_cr("nodes : Average number of nodes constructed per bytecode"); | |
| 1308 tty->print_cr("rnodes : Significance towards total nodes constructed, (nodes*relative)"); | |
| 1309 tty->print_cr("transforms: Average amount of tranform progress per bytecode compiled"); | |
| 1310 tty->print_cr("values : Average number of node values improved per bytecode"); | |
| 1311 tty->print_cr("name : Bytecode name"); | |
| 1312 tty->cr(); | |
| 1313 tty->print_cr(" absolute relative nodes rnodes transforms values name"); | |
| 1314 tty->print_cr("----------------------------------------------------------------------"); | |
| 1315 while (--i > 0) { | |
| 1316 int abs = _bytecodes_parsed[i]; | |
| 1317 float rel = abs * 100.0F / total; | |
| 1318 float nodes = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_constructed[i])/_bytecodes_parsed[i]; | |
| 1319 float rnodes = _bytecodes_parsed[i] == 0 ? 0 : rel * nodes; | |
| 1320 float xforms = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_transformed[i])/_bytecodes_parsed[i]; | |
| 1321 float values = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _new_values [i])/_bytecodes_parsed[i]; | |
| 1322 if (cutoff <= rel) { | |
| 1323 tty->print_cr("%10d %7.2f%% %6.1f %6.2f %6.1f %6.1f %s", abs, rel, nodes, rnodes, xforms, values, name_for_bc(i)); | |
| 1324 abs_sum += abs; | |
| 1325 } | |
| 1326 } | |
| 1327 tty->print_cr("----------------------------------------------------------------------"); | |
| 1328 float rel_sum = abs_sum * 100.0F / total; | |
| 1329 tty->print_cr("%10d %7.2f%% (cutoff = %.2f%%)", abs_sum, rel_sum, cutoff); | |
| 1330 tty->print_cr("----------------------------------------------------------------------"); | |
| 1331 tty->cr(); | |
| 1332 } | |
| 1333 #endif | |
| 1334 | |
| 1335 //----------------------------load_state_from---------------------------------- | |
| 1336 // Load block/map/sp. But not do not touch iter/bci. | |
| 1337 void Parse::load_state_from(Block* block) { | |
| 1338 set_block(block); | |
| 1339 // load the block's JVM state: | |
| 1340 set_map(block->start_map()); | |
| 1341 set_sp( block->start_sp()); | |
| 1342 } | |
| 1343 | |
| 1344 | |
| 1345 //-----------------------------record_state------------------------------------ | |
| 1346 void Parse::Block::record_state(Parse* p) { | |
| 1347 assert(!is_merged(), "can only record state once, on 1st inflow"); | |
| 1348 assert(start_sp() == p->sp(), "stack pointer must agree with ciTypeFlow"); | |
| 1349 set_start_map(p->stop()); | |
| 1350 } | |
| 1351 | |
| 1352 | |
| 1353 //------------------------------do_one_block----------------------------------- | |
| 1354 void Parse::do_one_block() { | |
| 1355 if (TraceOptoParse) { | |
| 1356 Block *b = block(); | |
| 1357 int ns = b->num_successors(); | |
| 1358 int nt = b->all_successors(); | |
| 1359 | |
| 1360 tty->print("Parsing block #%d at bci [%d,%d), successors: ", | |
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1361 block()->rpo(), block()->start(), block()->limit()); |
| 0 | 1362 for (int i = 0; i < nt; i++) { |
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1363 tty->print((( i < ns) ? " %d" : " %d(e)"), b->successor_at(i)->rpo()); |
| 0 | 1364 } |
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1365 if (b->is_loop_head()) tty->print(" lphd"); |
| 0 | 1366 tty->print_cr(""); |
| 1367 } | |
| 1368 | |
| 1369 assert(block()->is_merged(), "must be merged before being parsed"); | |
| 1370 block()->mark_parsed(); | |
| 1371 ++_blocks_parsed; | |
| 1372 | |
| 1373 // Set iterator to start of block. | |
| 1374 iter().reset_to_bci(block()->start()); | |
| 1375 | |
| 1376 CompileLog* log = C->log(); | |
| 1377 | |
| 1378 // Parse bytecodes | |
| 1379 while (!stopped() && !failing()) { | |
| 1380 iter().next(); | |
| 1381 | |
| 1382 // Learn the current bci from the iterator: | |
| 1383 set_parse_bci(iter().cur_bci()); | |
| 1384 | |
| 1385 if (bci() == block()->limit()) { | |
| 1386 // Do not walk into the next block until directed by do_all_blocks. | |
| 1387 merge(bci()); | |
| 1388 break; | |
| 1389 } | |
| 1390 assert(bci() < block()->limit(), "bci still in block"); | |
| 1391 | |
| 1392 if (log != NULL) { | |
| 1393 // Output an optional context marker, to help place actions | |
| 1394 // that occur during parsing of this BC. If there is no log | |
| 1395 // output until the next context string, this context string | |
| 1396 // will be silently ignored. | |
| 1397 log->context()->reset(); | |
| 1398 log->context()->print_cr("<bc code='%d' bci='%d'/>", (int)bc(), bci()); | |
| 1399 } | |
| 1400 | |
| 1401 if (block()->has_trap_at(bci())) { | |
| 1402 // We must respect the flow pass's traps, because it will refuse | |
| 1403 // to produce successors for trapping blocks. | |
| 1404 int trap_index = block()->flow()->trap_index(); | |
| 1405 assert(trap_index != 0, "trap index must be valid"); | |
| 1406 uncommon_trap(trap_index); | |
| 1407 break; | |
| 1408 } | |
| 1409 | |
| 1410 NOT_PRODUCT( parse_histogram()->set_initial_state(bc()); ); | |
| 1411 | |
| 1412 #ifdef ASSERT | |
| 1413 int pre_bc_sp = sp(); | |
| 1414 int inputs, depth; | |
| 1415 bool have_se = !stopped() && compute_stack_effects(inputs, depth); | |
| 1416 assert(!have_se || pre_bc_sp >= inputs, "have enough stack to execute this BC"); | |
| 1417 #endif //ASSERT | |
| 1418 | |
| 1419 do_one_bytecode(); | |
| 1420 | |
| 1421 assert(!have_se || stopped() || failing() || (sp() - pre_bc_sp) == depth, "correct depth prediction"); | |
| 1422 | |
| 1423 do_exceptions(); | |
| 1424 | |
| 1425 NOT_PRODUCT( parse_histogram()->record_change(); ); | |
| 1426 | |
| 1427 if (log != NULL) log->context()->reset(); // done w/ this one | |
| 1428 | |
| 1429 // Fall into next bytecode. Each bytecode normally has 1 sequential | |
| 1430 // successor which is typically made ready by visiting this bytecode. | |
| 1431 // If the successor has several predecessors, then it is a merge | |
| 1432 // point, starts a new basic block, and is handled like other basic blocks. | |
| 1433 } | |
| 1434 } | |
| 1435 | |
| 1436 | |
| 1437 //------------------------------merge------------------------------------------ | |
| 1438 void Parse::set_parse_bci(int bci) { | |
| 1439 set_bci(bci); | |
| 1440 Node_Notes* nn = C->default_node_notes(); | |
| 1441 if (nn == NULL) return; | |
| 1442 | |
| 1443 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls. | |
| 1444 if (!DebugInlinedCalls && depth() > 1) { | |
| 1445 return; | |
| 1446 } | |
| 1447 | |
| 1448 // Update the JVMS annotation, if present. | |
| 1449 JVMState* jvms = nn->jvms(); | |
| 1450 if (jvms != NULL && jvms->bci() != bci) { | |
| 1451 // Update the JVMS. | |
| 1452 jvms = jvms->clone_shallow(C); | |
| 1453 jvms->set_bci(bci); | |
| 1454 nn->set_jvms(jvms); | |
| 1455 } | |
| 1456 } | |
| 1457 | |
| 1458 //------------------------------merge------------------------------------------ | |
| 1459 // Merge the current mapping into the basic block starting at bci | |
| 1460 void Parse::merge(int target_bci) { | |
| 1461 Block* target = successor_for_bci(target_bci); | |
| 1462 if (target == NULL) { handle_missing_successor(target_bci); return; } | |
| 1463 assert(!target->is_ready(), "our arrival must be expected"); | |
| 1464 int pnum = target->next_path_num(); | |
| 1465 merge_common(target, pnum); | |
| 1466 } | |
| 1467 | |
| 1468 //-------------------------merge_new_path-------------------------------------- | |
| 1469 // Merge the current mapping into the basic block, using a new path | |
| 1470 void Parse::merge_new_path(int target_bci) { | |
| 1471 Block* target = successor_for_bci(target_bci); | |
| 1472 if (target == NULL) { handle_missing_successor(target_bci); return; } | |
| 1473 assert(!target->is_ready(), "new path into frozen graph"); | |
| 1474 int pnum = target->add_new_path(); | |
| 1475 merge_common(target, pnum); | |
| 1476 } | |
| 1477 | |
| 1478 //-------------------------merge_exception------------------------------------- | |
| 1479 // Merge the current mapping into the basic block starting at bci | |
| 1480 // The ex_oop must be pushed on the stack, unlike throw_to_exit. | |
| 1481 void Parse::merge_exception(int target_bci) { | |
| 1482 assert(sp() == 1, "must have only the throw exception on the stack"); | |
| 1483 Block* target = successor_for_bci(target_bci); | |
| 1484 if (target == NULL) { handle_missing_successor(target_bci); return; } | |
| 1485 assert(target->is_handler(), "exceptions are handled by special blocks"); | |
| 1486 int pnum = target->add_new_path(); | |
| 1487 merge_common(target, pnum); | |
| 1488 } | |
| 1489 | |
| 1490 //--------------------handle_missing_successor--------------------------------- | |
| 1491 void Parse::handle_missing_successor(int target_bci) { | |
| 1492 #ifndef PRODUCT | |
| 1493 Block* b = block(); | |
| 1494 int trap_bci = b->flow()->has_trap()? b->flow()->trap_bci(): -1; | |
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1495 tty->print_cr("### Missing successor at bci:%d for block #%d (trap_bci:%d)", target_bci, b->rpo(), trap_bci); |
| 0 | 1496 #endif |
| 1497 ShouldNotReachHere(); | |
| 1498 } | |
| 1499 | |
| 1500 //--------------------------merge_common--------------------------------------- | |
| 1501 void Parse::merge_common(Parse::Block* target, int pnum) { | |
| 1502 if (TraceOptoParse) { | |
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1503 tty->print("Merging state at block #%d bci:%d", target->rpo(), target->start()); |
| 0 | 1504 } |
| 1505 | |
| 1506 // Zap extra stack slots to top | |
| 1507 assert(sp() == target->start_sp(), ""); | |
| 1508 clean_stack(sp()); | |
| 1509 | |
| 1510 if (!target->is_merged()) { // No prior mapping at this bci | |
| 1511 if (TraceOptoParse) { tty->print(" with empty state"); } | |
| 1512 | |
| 1513 // If this path is dead, do not bother capturing it as a merge. | |
| 1514 // It is "as if" we had 1 fewer predecessors from the beginning. | |
| 1515 if (stopped()) { | |
| 1516 if (TraceOptoParse) tty->print_cr(", but path is dead and doesn't count"); | |
| 1517 return; | |
| 1518 } | |
| 1519 | |
| 1520 // Record that a new block has been merged. | |
| 1521 ++_blocks_merged; | |
| 1522 | |
| 1523 // Make a region if we know there are multiple or unpredictable inputs. | |
| 1524 // (Also, if this is a plain fall-through, we might see another region, | |
| 1525 // which must not be allowed into this block's map.) | |
| 1526 if (pnum > PhiNode::Input // Known multiple inputs. | |
| 1527 || target->is_handler() // These have unpredictable inputs. | |
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1528 || target->is_loop_head() // Known multiple inputs |
| 0 | 1529 || control()->is_Region()) { // We must hide this guy. |
| 1530 // Add a Region to start the new basic block. Phis will be added | |
| 1531 // later lazily. | |
| 1532 int edges = target->pred_count(); | |
| 1533 if (edges < pnum) edges = pnum; // might be a new path! | |
| 1534 Node *r = new (C, edges+1) RegionNode(edges+1); | |
| 1535 gvn().set_type(r, Type::CONTROL); | |
| 1536 record_for_igvn(r); | |
| 1537 // zap all inputs to NULL for debugging (done in Node(uint) constructor) | |
| 1538 // for (int j = 1; j < edges+1; j++) { r->init_req(j, NULL); } | |
| 1539 r->init_req(pnum, control()); | |
| 1540 set_control(r); | |
| 1541 } | |
| 1542 | |
| 1543 // Convert the existing Parser mapping into a mapping at this bci. | |
| 1544 store_state_to(target); | |
| 1545 assert(target->is_merged(), "do not come here twice"); | |
| 1546 | |
| 1547 } else { // Prior mapping at this bci | |
| 1548 if (TraceOptoParse) { tty->print(" with previous state"); } | |
| 1549 | |
| 1550 // We must not manufacture more phis if the target is already parsed. | |
| 1551 bool nophi = target->is_parsed(); | |
| 1552 | |
| 1553 SafePointNode* newin = map();// Hang on to incoming mapping | |
| 1554 Block* save_block = block(); // Hang on to incoming block; | |
| 1555 load_state_from(target); // Get prior mapping | |
| 1556 | |
| 1557 assert(newin->jvms()->locoff() == jvms()->locoff(), "JVMS layouts agree"); | |
| 1558 assert(newin->jvms()->stkoff() == jvms()->stkoff(), "JVMS layouts agree"); | |
| 1559 assert(newin->jvms()->monoff() == jvms()->monoff(), "JVMS layouts agree"); | |
| 1560 assert(newin->jvms()->endoff() == jvms()->endoff(), "JVMS layouts agree"); | |
| 1561 | |
| 1562 // Iterate over my current mapping and the old mapping. | |
| 1563 // Where different, insert Phi functions. | |
| 1564 // Use any existing Phi functions. | |
| 1565 assert(control()->is_Region(), "must be merging to a region"); | |
| 1566 RegionNode* r = control()->as_Region(); | |
| 1567 | |
| 1568 // Compute where to merge into | |
| 1569 // Merge incoming control path | |
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1570 r->init_req(pnum, newin->control()); |
| 0 | 1571 |
| 1572 if (pnum == 1) { // Last merge for this Region? | |
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1573 if (!block()->flow()->is_irreducible_entry()) { |
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1574 Node* result = _gvn.transform_no_reclaim(r); |
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1575 if (r != result && TraceOptoParse) { |
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1576 tty->print_cr("Block #%d replace %d with %d", block()->rpo(), r->_idx, result->_idx); |
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1577 } |
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1578 } |
| 0 | 1579 record_for_igvn(r); |
| 1580 } | |
| 1581 | |
| 1582 // Update all the non-control inputs to map: | |
| 1583 assert(TypeFunc::Parms == newin->jvms()->locoff(), "parser map should contain only youngest jvms"); | |
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1584 bool check_elide_phi = target->is_SEL_backedge(save_block); |
| 0 | 1585 for (uint j = 1; j < newin->req(); j++) { |
| 1586 Node* m = map()->in(j); // Current state of target. | |
| 1587 Node* n = newin->in(j); // Incoming change to target state. | |
| 1588 PhiNode* phi; | |
| 1589 if (m->is_Phi() && m->as_Phi()->region() == r) | |
| 1590 phi = m->as_Phi(); | |
| 1591 else | |
| 1592 phi = NULL; | |
| 1593 if (m != n) { // Different; must merge | |
| 1594 switch (j) { | |
| 1595 // Frame pointer and Return Address never changes | |
| 1596 case TypeFunc::FramePtr:// Drop m, use the original value | |
| 1597 case TypeFunc::ReturnAdr: | |
| 1598 break; | |
| 1599 case TypeFunc::Memory: // Merge inputs to the MergeMem node | |
| 1600 assert(phi == NULL, "the merge contains phis, not vice versa"); | |
| 1601 merge_memory_edges(n->as_MergeMem(), pnum, nophi); | |
| 1602 continue; | |
| 1603 default: // All normal stuff | |
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1604 if (phi == NULL) { |
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1605 if (!check_elide_phi || !target->can_elide_SEL_phi(j)) { |
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1606 phi = ensure_phi(j, nophi); |
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1607 } |
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1608 } |
| 0 | 1609 break; |
| 1610 } | |
| 1611 } | |
| 1612 // At this point, n might be top if: | |
| 1613 // - there is no phi (because TypeFlow detected a conflict), or | |
| 1614 // - the corresponding control edges is top (a dead incoming path) | |
| 1615 // It is a bug if we create a phi which sees a garbage value on a live path. | |
| 1616 | |
| 1617 if (phi != NULL) { | |
| 1618 assert(n != top() || r->in(pnum) == top(), "live value must not be garbage"); | |
| 1619 assert(phi->region() == r, ""); | |
| 1620 phi->set_req(pnum, n); // Then add 'n' to the merge | |
| 1621 if (pnum == PhiNode::Input) { | |
| 1622 // Last merge for this Phi. | |
| 1623 // So far, Phis have had a reasonable type from ciTypeFlow. | |
| 1624 // Now _gvn will join that with the meet of current inputs. | |
| 1625 // BOTTOM is never permissible here, 'cause pessimistically | |
| 1626 // Phis of pointers cannot lose the basic pointer type. | |
| 1627 debug_only(const Type* bt1 = phi->bottom_type()); | |
| 1628 assert(bt1 != Type::BOTTOM, "should not be building conflict phis"); | |
| 1629 map()->set_req(j, _gvn.transform_no_reclaim(phi)); | |
| 1630 debug_only(const Type* bt2 = phi->bottom_type()); | |
| 1631 assert(bt2->higher_equal(bt1), "must be consistent with type-flow"); | |
| 1632 record_for_igvn(phi); | |
| 1633 } | |
| 1634 } | |
| 1635 } // End of for all values to be merged | |
| 1636 | |
| 1637 if (pnum == PhiNode::Input && | |
| 1638 !r->in(0)) { // The occasional useless Region | |
| 1639 assert(control() == r, ""); | |
| 1640 set_control(r->nonnull_req()); | |
| 1641 } | |
| 1642 | |
| 1643 // newin has been subsumed into the lazy merge, and is now dead. | |
| 1644 set_block(save_block); | |
| 1645 | |
| 1646 stop(); // done with this guy, for now | |
| 1647 } | |
| 1648 | |
| 1649 if (TraceOptoParse) { | |
| 1650 tty->print_cr(" on path %d", pnum); | |
| 1651 } | |
| 1652 | |
| 1653 // Done with this parser state. | |
| 1654 assert(stopped(), ""); | |
| 1655 } | |
| 1656 | |
| 1657 | |
| 1658 //--------------------------merge_memory_edges--------------------------------- | |
| 1659 void Parse::merge_memory_edges(MergeMemNode* n, int pnum, bool nophi) { | |
| 1660 // (nophi means we must not create phis, because we already parsed here) | |
| 1661 assert(n != NULL, ""); | |
| 1662 // Merge the inputs to the MergeMems | |
| 1663 MergeMemNode* m = merged_memory(); | |
| 1664 | |
| 1665 assert(control()->is_Region(), "must be merging to a region"); | |
| 1666 RegionNode* r = control()->as_Region(); | |
| 1667 | |
| 1668 PhiNode* base = NULL; | |
| 1669 MergeMemNode* remerge = NULL; | |
| 1670 for (MergeMemStream mms(m, n); mms.next_non_empty2(); ) { | |
| 1671 Node *p = mms.force_memory(); | |
| 1672 Node *q = mms.memory2(); | |
| 1673 if (mms.is_empty() && nophi) { | |
| 1674 // Trouble: No new splits allowed after a loop body is parsed. | |
| 1675 // Instead, wire the new split into a MergeMem on the backedge. | |
| 1676 // The optimizer will sort it out, slicing the phi. | |
| 1677 if (remerge == NULL) { | |
| 1678 assert(base != NULL, ""); | |
| 1679 assert(base->in(0) != NULL, "should not be xformed away"); | |
| 1680 remerge = MergeMemNode::make(C, base->in(pnum)); | |
| 1681 gvn().set_type(remerge, Type::MEMORY); | |
| 1682 base->set_req(pnum, remerge); | |
| 1683 } | |
| 1684 remerge->set_memory_at(mms.alias_idx(), q); | |
| 1685 continue; | |
| 1686 } | |
| 1687 assert(!q->is_MergeMem(), ""); | |
| 1688 PhiNode* phi; | |
| 1689 if (p != q) { | |
| 1690 phi = ensure_memory_phi(mms.alias_idx(), nophi); | |
| 1691 } else { | |
| 1692 if (p->is_Phi() && p->as_Phi()->region() == r) | |
| 1693 phi = p->as_Phi(); | |
| 1694 else | |
| 1695 phi = NULL; | |
| 1696 } | |
| 1697 // Insert q into local phi | |
| 1698 if (phi != NULL) { | |
| 1699 assert(phi->region() == r, ""); | |
| 1700 p = phi; | |
| 1701 phi->set_req(pnum, q); | |
| 1702 if (mms.at_base_memory()) { | |
| 1703 base = phi; // delay transforming it | |
| 1704 } else if (pnum == 1) { | |
| 1705 record_for_igvn(phi); | |
| 1706 p = _gvn.transform_no_reclaim(phi); | |
| 1707 } | |
| 1708 mms.set_memory(p);// store back through the iterator | |
| 1709 } | |
| 1710 } | |
| 1711 // Transform base last, in case we must fiddle with remerging. | |
| 1712 if (base != NULL && pnum == 1) { | |
| 1713 record_for_igvn(base); | |
| 1714 m->set_base_memory( _gvn.transform_no_reclaim(base) ); | |
| 1715 } | |
| 1716 } | |
| 1717 | |
| 1718 | |
| 1719 //------------------------ensure_phis_everywhere------------------------------- | |
| 1720 void Parse::ensure_phis_everywhere() { | |
| 1721 ensure_phi(TypeFunc::I_O); | |
| 1722 | |
| 1723 // Ensure a phi on all currently known memories. | |
| 1724 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) { | |
| 1725 ensure_memory_phi(mms.alias_idx()); | |
| 1726 debug_only(mms.set_memory()); // keep the iterator happy | |
| 1727 } | |
| 1728 | |
| 1729 // Note: This is our only chance to create phis for memory slices. | |
| 1730 // If we miss a slice that crops up later, it will have to be | |
| 1731 // merged into the base-memory phi that we are building here. | |
| 1732 // Later, the optimizer will comb out the knot, and build separate | |
| 1733 // phi-loops for each memory slice that matters. | |
| 1734 | |
| 1735 // Monitors must nest nicely and not get confused amongst themselves. | |
| 1736 // Phi-ify everything up to the monitors, though. | |
| 1737 uint monoff = map()->jvms()->monoff(); | |
| 1738 uint nof_monitors = map()->jvms()->nof_monitors(); | |
| 1739 | |
| 1740 assert(TypeFunc::Parms == map()->jvms()->locoff(), "parser map should contain only youngest jvms"); | |
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1741 bool check_elide_phi = block()->is_SEL_head(); |
| 0 | 1742 for (uint i = TypeFunc::Parms; i < monoff; i++) { |
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1743 if (!check_elide_phi || !block()->can_elide_SEL_phi(i)) { |
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1744 ensure_phi(i); |
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1745 } |
| 0 | 1746 } |
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1747 |
| 0 | 1748 // Even monitors need Phis, though they are well-structured. |
| 1749 // This is true for OSR methods, and also for the rare cases where | |
| 1750 // a monitor object is the subject of a replace_in_map operation. | |
| 1751 // See bugs 4426707 and 5043395. | |
| 1752 for (uint m = 0; m < nof_monitors; m++) { | |
| 1753 ensure_phi(map()->jvms()->monitor_obj_offset(m)); | |
| 1754 } | |
| 1755 } | |
| 1756 | |
| 1757 | |
| 1758 //-----------------------------add_new_path------------------------------------ | |
| 1759 // Add a previously unaccounted predecessor to this block. | |
| 1760 int Parse::Block::add_new_path() { | |
| 1761 // If there is no map, return the lowest unused path number. | |
| 1762 if (!is_merged()) return pred_count()+1; // there will be a map shortly | |
| 1763 | |
| 1764 SafePointNode* map = start_map(); | |
| 1765 if (!map->control()->is_Region()) | |
| 1766 return pred_count()+1; // there may be a region some day | |
| 1767 RegionNode* r = map->control()->as_Region(); | |
| 1768 | |
| 1769 // Add new path to the region. | |
| 1770 uint pnum = r->req(); | |
| 1771 r->add_req(NULL); | |
| 1772 | |
| 1773 for (uint i = 1; i < map->req(); i++) { | |
| 1774 Node* n = map->in(i); | |
| 1775 if (i == TypeFunc::Memory) { | |
| 1776 // Ensure a phi on all currently known memories. | |
| 1777 for (MergeMemStream mms(n->as_MergeMem()); mms.next_non_empty(); ) { | |
| 1778 Node* phi = mms.memory(); | |
| 1779 if (phi->is_Phi() && phi->as_Phi()->region() == r) { | |
| 1780 assert(phi->req() == pnum, "must be same size as region"); | |
| 1781 phi->add_req(NULL); | |
| 1782 } | |
| 1783 } | |
| 1784 } else { | |
| 1785 if (n->is_Phi() && n->as_Phi()->region() == r) { | |
| 1786 assert(n->req() == pnum, "must be same size as region"); | |
| 1787 n->add_req(NULL); | |
| 1788 } | |
| 1789 } | |
| 1790 } | |
| 1791 | |
| 1792 return pnum; | |
| 1793 } | |
| 1794 | |
| 1795 //------------------------------ensure_phi------------------------------------- | |
| 1796 // Turn the idx'th entry of the current map into a Phi | |
| 1797 PhiNode *Parse::ensure_phi(int idx, bool nocreate) { | |
| 1798 SafePointNode* map = this->map(); | |
| 1799 Node* region = map->control(); | |
| 1800 assert(region->is_Region(), ""); | |
| 1801 | |
| 1802 Node* o = map->in(idx); | |
| 1803 assert(o != NULL, ""); | |
| 1804 | |
| 1805 if (o == top()) return NULL; // TOP always merges into TOP | |
| 1806 | |
| 1807 if (o->is_Phi() && o->as_Phi()->region() == region) { | |
| 1808 return o->as_Phi(); | |
| 1809 } | |
| 1810 | |
| 1811 // Now use a Phi here for merging | |
| 1812 assert(!nocreate, "Cannot build a phi for a block already parsed."); | |
| 1813 const JVMState* jvms = map->jvms(); | |
| 1814 const Type* t; | |
| 1815 if (jvms->is_loc(idx)) { | |
| 1816 t = block()->local_type_at(idx - jvms->locoff()); | |
| 1817 } else if (jvms->is_stk(idx)) { | |
| 1818 t = block()->stack_type_at(idx - jvms->stkoff()); | |
| 1819 } else if (jvms->is_mon(idx)) { | |
| 1820 assert(!jvms->is_monitor_box(idx), "no phis for boxes"); | |
| 1821 t = TypeInstPtr::BOTTOM; // this is sufficient for a lock object | |
| 1822 } else if ((uint)idx < TypeFunc::Parms) { | |
| 1823 t = o->bottom_type(); // Type::RETURN_ADDRESS or such-like. | |
| 1824 } else { | |
| 1825 assert(false, "no type information for this phi"); | |
| 1826 } | |
| 1827 | |
| 1828 // If the type falls to bottom, then this must be a local that | |
| 1829 // is mixing ints and oops or some such. Forcing it to top | |
| 1830 // makes it go dead. | |
| 1831 if (t == Type::BOTTOM) { | |
| 1832 map->set_req(idx, top()); | |
| 1833 return NULL; | |
| 1834 } | |
| 1835 | |
| 1836 // Do not create phis for top either. | |
| 1837 // A top on a non-null control flow must be an unused even after the.phi. | |
| 1838 if (t == Type::TOP || t == Type::HALF) { | |
| 1839 map->set_req(idx, top()); | |
| 1840 return NULL; | |
| 1841 } | |
| 1842 | |
| 1843 PhiNode* phi = PhiNode::make(region, o, t); | |
| 1844 gvn().set_type(phi, t); | |
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1845 if (C->do_escape_analysis()) record_for_igvn(phi); |
| 0 | 1846 map->set_req(idx, phi); |
| 1847 return phi; | |
| 1848 } | |
| 1849 | |
| 1850 //--------------------------ensure_memory_phi---------------------------------- | |
| 1851 // Turn the idx'th slice of the current memory into a Phi | |
| 1852 PhiNode *Parse::ensure_memory_phi(int idx, bool nocreate) { | |
| 1853 MergeMemNode* mem = merged_memory(); | |
| 1854 Node* region = control(); | |
| 1855 assert(region->is_Region(), ""); | |
| 1856 | |
| 1857 Node *o = (idx == Compile::AliasIdxBot)? mem->base_memory(): mem->memory_at(idx); | |
| 1858 assert(o != NULL && o != top(), ""); | |
| 1859 | |
| 1860 PhiNode* phi; | |
| 1861 if (o->is_Phi() && o->as_Phi()->region() == region) { | |
| 1862 phi = o->as_Phi(); | |
| 1863 if (phi == mem->base_memory() && idx >= Compile::AliasIdxRaw) { | |
| 1864 // clone the shared base memory phi to make a new memory split | |
| 1865 assert(!nocreate, "Cannot build a phi for a block already parsed."); | |
| 1866 const Type* t = phi->bottom_type(); | |
| 1867 const TypePtr* adr_type = C->get_adr_type(idx); | |
| 1868 phi = phi->slice_memory(adr_type); | |
| 1869 gvn().set_type(phi, t); | |
| 1870 } | |
| 1871 return phi; | |
| 1872 } | |
| 1873 | |
| 1874 // Now use a Phi here for merging | |
| 1875 assert(!nocreate, "Cannot build a phi for a block already parsed."); | |
| 1876 const Type* t = o->bottom_type(); | |
| 1877 const TypePtr* adr_type = C->get_adr_type(idx); | |
| 1878 phi = PhiNode::make(region, o, t, adr_type); | |
| 1879 gvn().set_type(phi, t); | |
| 1880 if (idx == Compile::AliasIdxBot) | |
| 1881 mem->set_base_memory(phi); | |
| 1882 else | |
| 1883 mem->set_memory_at(idx, phi); | |
| 1884 return phi; | |
| 1885 } | |
| 1886 | |
| 1887 //------------------------------call_register_finalizer----------------------- | |
| 1888 // Check the klass of the receiver and call register_finalizer if the | |
| 1889 // class need finalization. | |
| 1890 void Parse::call_register_finalizer() { | |
| 1891 Node* receiver = local(0); | |
| 1892 assert(receiver != NULL && receiver->bottom_type()->isa_instptr() != NULL, | |
| 1893 "must have non-null instance type"); | |
| 1894 | |
| 1895 const TypeInstPtr *tinst = receiver->bottom_type()->isa_instptr(); | |
| 1896 if (tinst != NULL && tinst->klass()->is_loaded() && !tinst->klass_is_exact()) { | |
| 1897 // The type isn't known exactly so see if CHA tells us anything. | |
| 1898 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); | |
| 1899 if (!Dependencies::has_finalizable_subclass(ik)) { | |
| 1900 // No finalizable subclasses so skip the dynamic check. | |
| 1901 C->dependencies()->assert_has_no_finalizable_subclasses(ik); | |
| 1902 return; | |
| 1903 } | |
| 1904 } | |
| 1905 | |
| 1906 // Insert a dynamic test for whether the instance needs | |
| 1907 // finalization. In general this will fold up since the concrete | |
| 1908 // class is often visible so the access flags are constant. | |
| 1909 Node* klass_addr = basic_plus_adr( receiver, receiver, oopDesc::klass_offset_in_bytes() ); | |
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1910 Node* klass = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), klass_addr, TypeInstPtr::KLASS) ); |
| 0 | 1911 |
| 1912 Node* access_flags_addr = basic_plus_adr(klass, klass, Klass::access_flags_offset_in_bytes() + sizeof(oopDesc)); | |
| 1913 Node* access_flags = make_load(NULL, access_flags_addr, TypeInt::INT, T_INT); | |
| 1914 | |
| 1915 Node* mask = _gvn.transform(new (C, 3) AndINode(access_flags, intcon(JVM_ACC_HAS_FINALIZER))); | |
| 1916 Node* check = _gvn.transform(new (C, 3) CmpINode(mask, intcon(0))); | |
| 1917 Node* test = _gvn.transform(new (C, 2) BoolNode(check, BoolTest::ne)); | |
| 1918 | |
| 1919 IfNode* iff = create_and_map_if(control(), test, PROB_MAX, COUNT_UNKNOWN); | |
| 1920 | |
| 1921 RegionNode* result_rgn = new (C, 3) RegionNode(3); | |
| 1922 record_for_igvn(result_rgn); | |
| 1923 | |
| 1924 Node *skip_register = _gvn.transform(new (C, 1) IfFalseNode(iff)); | |
| 1925 result_rgn->init_req(1, skip_register); | |
| 1926 | |
| 1927 Node *needs_register = _gvn.transform(new (C, 1) IfTrueNode(iff)); | |
| 1928 set_control(needs_register); | |
| 1929 if (stopped()) { | |
| 1930 // There is no slow path. | |
| 1931 result_rgn->init_req(2, top()); | |
| 1932 } else { | |
| 1933 Node *call = make_runtime_call(RC_NO_LEAF, | |
| 1934 OptoRuntime::register_finalizer_Type(), | |
| 1935 OptoRuntime::register_finalizer_Java(), | |
| 1936 NULL, TypePtr::BOTTOM, | |
| 1937 receiver); | |
| 1938 make_slow_call_ex(call, env()->Throwable_klass(), true); | |
| 1939 | |
| 1940 Node* fast_io = call->in(TypeFunc::I_O); | |
| 1941 Node* fast_mem = call->in(TypeFunc::Memory); | |
| 1942 // These two phis are pre-filled with copies of of the fast IO and Memory | |
| 1943 Node* io_phi = PhiNode::make(result_rgn, fast_io, Type::ABIO); | |
| 1944 Node* mem_phi = PhiNode::make(result_rgn, fast_mem, Type::MEMORY, TypePtr::BOTTOM); | |
| 1945 | |
| 1946 result_rgn->init_req(2, control()); | |
| 1947 io_phi ->init_req(2, i_o()); | |
| 1948 mem_phi ->init_req(2, reset_memory()); | |
| 1949 | |
| 1950 set_all_memory( _gvn.transform(mem_phi) ); | |
| 1951 set_i_o( _gvn.transform(io_phi) ); | |
| 1952 } | |
| 1953 | |
| 1954 set_control( _gvn.transform(result_rgn) ); | |
| 1955 } | |
| 1956 | |
| 1957 //------------------------------return_current--------------------------------- | |
| 1958 // Append current _map to _exit_return | |
| 1959 void Parse::return_current(Node* value) { | |
| 1960 if (RegisterFinalizersAtInit && | |
| 1961 method()->intrinsic_id() == vmIntrinsics::_Object_init) { | |
| 1962 call_register_finalizer(); | |
| 1963 } | |
| 1964 | |
| 1965 // Do not set_parse_bci, so that return goo is credited to the return insn. | |
| 1966 set_bci(InvocationEntryBci); | |
| 1967 if (method()->is_synchronized() && GenerateSynchronizationCode) { | |
| 1968 shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node()); | |
| 1969 } | |
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1970 if (C->env()->dtrace_method_probes()) { |
| 0 | 1971 make_dtrace_method_exit(method()); |
| 1972 } | |
| 1973 SafePointNode* exit_return = _exits.map(); | |
| 1974 exit_return->in( TypeFunc::Control )->add_req( control() ); | |
| 1975 exit_return->in( TypeFunc::I_O )->add_req( i_o () ); | |
| 1976 Node *mem = exit_return->in( TypeFunc::Memory ); | |
| 1977 for (MergeMemStream mms(mem->as_MergeMem(), merged_memory()); mms.next_non_empty2(); ) { | |
| 1978 if (mms.is_empty()) { | |
| 1979 // get a copy of the base memory, and patch just this one input | |
| 1980 const TypePtr* adr_type = mms.adr_type(C); | |
| 1981 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type); | |
| 1982 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), ""); | |
| 1983 gvn().set_type_bottom(phi); | |
| 1984 phi->del_req(phi->req()-1); // prepare to re-patch | |
| 1985 mms.set_memory(phi); | |
| 1986 } | |
| 1987 mms.memory()->add_req(mms.memory2()); | |
| 1988 } | |
| 1989 | |
| 1990 // frame pointer is always same, already captured | |
| 1991 if (value != NULL) { | |
| 1992 // If returning oops to an interface-return, there is a silent free | |
| 1993 // cast from oop to interface allowed by the Verifier. Make it explicit | |
| 1994 // here. | |
| 1995 Node* phi = _exits.argument(0); | |
| 1996 const TypeInstPtr *tr = phi->bottom_type()->isa_instptr(); | |
| 1997 if( tr && tr->klass()->is_loaded() && | |
| 1998 tr->klass()->is_interface() ) { | |
| 1999 const TypeInstPtr *tp = value->bottom_type()->isa_instptr(); | |
| 2000 if (tp && tp->klass()->is_loaded() && | |
| 2001 !tp->klass()->is_interface()) { | |
| 2002 // sharpen the type eagerly; this eases certain assert checking | |
| 2003 if (tp->higher_equal(TypeInstPtr::NOTNULL)) | |
| 2004 tr = tr->join(TypeInstPtr::NOTNULL)->is_instptr(); | |
| 2005 value = _gvn.transform(new (C, 2) CheckCastPPNode(0,value,tr)); | |
| 2006 } | |
| 2007 } | |
| 2008 phi->add_req(value); | |
| 2009 } | |
| 2010 | |
| 2011 stop_and_kill_map(); // This CFG path dies here | |
| 2012 } | |
| 2013 | |
| 2014 | |
| 2015 //------------------------------add_safepoint---------------------------------- | |
| 2016 void Parse::add_safepoint() { | |
| 2017 // See if we can avoid this safepoint. No need for a SafePoint immediately | |
| 2018 // after a Call (except Leaf Call) or another SafePoint. | |
| 2019 Node *proj = control(); | |
| 2020 bool add_poll_param = SafePointNode::needs_polling_address_input(); | |
| 2021 uint parms = add_poll_param ? TypeFunc::Parms+1 : TypeFunc::Parms; | |
| 2022 if( proj->is_Proj() ) { | |
| 2023 Node *n0 = proj->in(0); | |
| 2024 if( n0->is_Catch() ) { | |
| 2025 n0 = n0->in(0)->in(0); | |
| 2026 assert( n0->is_Call(), "expect a call here" ); | |
| 2027 } | |
| 2028 if( n0->is_Call() ) { | |
| 2029 if( n0->as_Call()->guaranteed_safepoint() ) | |
| 2030 return; | |
| 2031 } else if( n0->is_SafePoint() && n0->req() >= parms ) { | |
| 2032 return; | |
| 2033 } | |
| 2034 } | |
| 2035 | |
| 2036 // Clear out dead values from the debug info. | |
| 2037 kill_dead_locals(); | |
| 2038 | |
| 2039 // Clone the JVM State | |
| 2040 SafePointNode *sfpnt = new (C, parms) SafePointNode(parms, NULL); | |
| 2041 | |
| 2042 // Capture memory state BEFORE a SafePoint. Since we can block at a | |
| 2043 // SafePoint we need our GC state to be safe; i.e. we need all our current | |
| 2044 // write barriers (card marks) to not float down after the SafePoint so we | |
| 2045 // must read raw memory. Likewise we need all oop stores to match the card | |
| 2046 // marks. If deopt can happen, we need ALL stores (we need the correct JVM | |
| 2047 // state on a deopt). | |
| 2048 | |
| 2049 // We do not need to WRITE the memory state after a SafePoint. The control | |
| 2050 // edge will keep card-marks and oop-stores from floating up from below a | |
| 2051 // SafePoint and our true dependency added here will keep them from floating | |
| 2052 // down below a SafePoint. | |
| 2053 | |
| 2054 // Clone the current memory state | |
| 2055 Node* mem = MergeMemNode::make(C, map()->memory()); | |
| 2056 | |
| 2057 mem = _gvn.transform(mem); | |
| 2058 | |
| 2059 // Pass control through the safepoint | |
| 2060 sfpnt->init_req(TypeFunc::Control , control()); | |
| 2061 // Fix edges normally used by a call | |
| 2062 sfpnt->init_req(TypeFunc::I_O , top() ); | |
| 2063 sfpnt->init_req(TypeFunc::Memory , mem ); | |
| 2064 sfpnt->init_req(TypeFunc::ReturnAdr, top() ); | |
| 2065 sfpnt->init_req(TypeFunc::FramePtr , top() ); | |
| 2066 | |
| 2067 // Create a node for the polling address | |
| 2068 if( add_poll_param ) { | |
| 2069 Node *polladr = ConPNode::make(C, (address)os::get_polling_page()); | |
| 2070 sfpnt->init_req(TypeFunc::Parms+0, _gvn.transform(polladr)); | |
| 2071 } | |
| 2072 | |
| 2073 // Fix up the JVM State edges | |
| 2074 add_safepoint_edges(sfpnt); | |
| 2075 Node *transformed_sfpnt = _gvn.transform(sfpnt); | |
| 2076 set_control(transformed_sfpnt); | |
| 2077 | |
| 2078 // Provide an edge from root to safepoint. This makes the safepoint | |
| 2079 // appear useful until the parse has completed. | |
| 2080 if( OptoRemoveUseless && transformed_sfpnt->is_SafePoint() ) { | |
| 2081 assert(C->root() != NULL, "Expect parse is still valid"); | |
| 2082 C->root()->add_prec(transformed_sfpnt); | |
| 2083 } | |
| 2084 } | |
| 2085 | |
| 2086 #ifndef PRODUCT | |
| 2087 //------------------------show_parse_info-------------------------------------- | |
| 2088 void Parse::show_parse_info() { | |
| 2089 InlineTree* ilt = NULL; | |
| 2090 if (C->ilt() != NULL) { | |
| 2091 JVMState* caller_jvms = is_osr_parse() ? caller()->caller() : caller(); | |
| 2092 ilt = InlineTree::find_subtree_from_root(C->ilt(), caller_jvms, method()); | |
| 2093 } | |
| 2094 if (PrintCompilation && Verbose) { | |
| 2095 if (depth() == 1) { | |
| 2096 if( ilt->count_inlines() ) { | |
| 2097 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(), | |
| 2098 ilt->count_inline_bcs()); | |
| 2099 tty->cr(); | |
| 2100 } | |
| 2101 } else { | |
| 2102 if (method()->is_synchronized()) tty->print("s"); | |
| 2103 if (method()->has_exception_handlers()) tty->print("!"); | |
| 2104 // Check this is not the final compiled version | |
| 2105 if (C->trap_can_recompile()) { | |
| 2106 tty->print("-"); | |
| 2107 } else { | |
| 2108 tty->print(" "); | |
| 2109 } | |
| 2110 method()->print_short_name(); | |
| 2111 if (is_osr_parse()) { | |
| 2112 tty->print(" @ %d", osr_bci()); | |
| 2113 } | |
| 2114 tty->print(" (%d bytes)",method()->code_size()); | |
| 2115 if (ilt->count_inlines()) { | |
| 2116 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(), | |
| 2117 ilt->count_inline_bcs()); | |
| 2118 } | |
| 2119 tty->cr(); | |
| 2120 } | |
| 2121 } | |
| 2122 if (PrintOpto && (depth() == 1 || PrintOptoInlining)) { | |
| 2123 // Print that we succeeded; suppress this message on the first osr parse. | |
| 2124 | |
| 2125 if (method()->is_synchronized()) tty->print("s"); | |
| 2126 if (method()->has_exception_handlers()) tty->print("!"); | |
| 2127 // Check this is not the final compiled version | |
| 2128 if (C->trap_can_recompile() && depth() == 1) { | |
| 2129 tty->print("-"); | |
| 2130 } else { | |
| 2131 tty->print(" "); | |
| 2132 } | |
| 2133 if( depth() != 1 ) { tty->print(" "); } // missing compile count | |
| 2134 for (int i = 1; i < depth(); ++i) { tty->print(" "); } | |
| 2135 method()->print_short_name(); | |
| 2136 if (is_osr_parse()) { | |
| 2137 tty->print(" @ %d", osr_bci()); | |
| 2138 } | |
| 2139 if (ilt->caller_bci() != -1) { | |
| 2140 tty->print(" @ %d", ilt->caller_bci()); | |
| 2141 } | |
| 2142 tty->print(" (%d bytes)",method()->code_size()); | |
| 2143 if (ilt->count_inlines()) { | |
| 2144 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(), | |
| 2145 ilt->count_inline_bcs()); | |
| 2146 } | |
| 2147 tty->cr(); | |
| 2148 } | |
| 2149 } | |
| 2150 | |
| 2151 | |
| 2152 //------------------------------dump------------------------------------------- | |
| 2153 // Dump information associated with the bytecodes of current _method | |
| 2154 void Parse::dump() { | |
| 2155 if( method() != NULL ) { | |
| 2156 // Iterate over bytecodes | |
| 2157 ciBytecodeStream iter(method()); | |
| 2158 for( Bytecodes::Code bc = iter.next(); bc != ciBytecodeStream::EOBC() ; bc = iter.next() ) { | |
| 2159 dump_bci( iter.cur_bci() ); | |
| 2160 tty->cr(); | |
| 2161 } | |
| 2162 } | |
| 2163 } | |
| 2164 | |
| 2165 // Dump information associated with a byte code index, 'bci' | |
| 2166 void Parse::dump_bci(int bci) { | |
| 2167 // Output info on merge-points, cloning, and within _jsr..._ret | |
| 2168 // NYI | |
| 2169 tty->print(" bci:%d", bci); | |
| 2170 } | |
| 2171 | |
| 2172 #endif |