1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #include "v8.h" 29 30 #include "compiler.h" 31 32 #include "bootstrapper.h" 33 #include "codegen.h" 34 #include "compilation-cache.h" 35 #include "cpu-profiler.h" 36 #include "debug.h" 37 #include "deoptimizer.h" 38 #include "full-codegen.h" 39 #include "gdb-jit.h" 40 #include "typing.h" 41 #include "hydrogen.h" 42 #include "isolate-inl.h" 43 #include "lithium.h" 44 #include "liveedit.h" 45 #include "parser.h" 46 #include "rewriter.h" 47 #include "runtime-profiler.h" 48 #include "scanner-character-streams.h" 49 #include "scopeinfo.h" 50 #include "scopes.h" 51 #include "vm-state-inl.h" 52 53 namespace v8 { 54 namespace internal { 55 56 57 CompilationInfo::CompilationInfo(Handle<Script> script, 58 Zone* zone) 59 : flags_(LanguageModeField::encode(CLASSIC_MODE)), 60 script_(script), 61 osr_ast_id_(BailoutId::None()), 62 osr_pc_offset_(0), 63 parameter_count_(0) { 64 Initialize(script->GetIsolate(), BASE, zone); 65 } 66 67 68 CompilationInfo::CompilationInfo(Handle<SharedFunctionInfo> shared_info, 69 Zone* zone) 70 : flags_(LanguageModeField::encode(CLASSIC_MODE) | IsLazy::encode(true)), 71 shared_info_(shared_info), 72 script_(Handle<Script>(Script::cast(shared_info->script()))), 73 osr_ast_id_(BailoutId::None()), 74 osr_pc_offset_(0), 75 parameter_count_(0) { 76 Initialize(script_->GetIsolate(), BASE, zone); 77 } 78 79 80 CompilationInfo::CompilationInfo(Handle<JSFunction> closure, 81 Zone* zone) 82 : flags_(LanguageModeField::encode(CLASSIC_MODE) | IsLazy::encode(true)), 83 closure_(closure), 84 shared_info_(Handle<SharedFunctionInfo>(closure->shared())), 85 script_(Handle<Script>(Script::cast(shared_info_->script()))), 86 context_(closure->context()), 87 osr_ast_id_(BailoutId::None()), 88 osr_pc_offset_(0), 89 parameter_count_(0) { 90 Initialize(script_->GetIsolate(), BASE, zone); 91 } 92 93 94 CompilationInfo::CompilationInfo(HydrogenCodeStub* stub, 95 Isolate* isolate, 96 Zone* zone) 97 : flags_(LanguageModeField::encode(CLASSIC_MODE) | 98 IsLazy::encode(true)), 99 osr_ast_id_(BailoutId::None()), 100 osr_pc_offset_(0), 101 parameter_count_(0) { 102 Initialize(isolate, STUB, zone); 103 code_stub_ = stub; 104 } 105 106 107 void CompilationInfo::Initialize(Isolate* isolate, 108 Mode mode, 109 Zone* zone) { 110 isolate_ = isolate; 111 function_ = NULL; 112 scope_ = NULL; 113 global_scope_ = NULL; 114 extension_ = NULL; 115 pre_parse_data_ = NULL; 116 zone_ = zone; 117 deferred_handles_ = NULL; 118 code_stub_ = NULL; 119 prologue_offset_ = Code::kPrologueOffsetNotSet; 120 opt_count_ = shared_info().is_null() ? 0 : shared_info()->opt_count(); 121 no_frame_ranges_ = isolate->cpu_profiler()->is_profiling() 122 ? new List<OffsetRange>(2) : NULL; 123 for (int i = 0; i < DependentCode::kGroupCount; i++) { 124 dependencies_[i] = NULL; 125 } 126 if (mode == STUB) { 127 mode_ = STUB; 128 return; 129 } 130 mode_ = mode; 131 abort_due_to_dependency_ = false; 132 if (script_->type()->value() == Script::TYPE_NATIVE) { 133 MarkAsNative(); 134 } 135 if (!shared_info_.is_null()) { 136 ASSERT(language_mode() == CLASSIC_MODE); 137 SetLanguageMode(shared_info_->language_mode()); 138 } 139 set_bailout_reason(kUnknown); 140 } 141 142 143 CompilationInfo::~CompilationInfo() { 144 delete deferred_handles_; 145 delete no_frame_ranges_; 146 #ifdef DEBUG 147 // Check that no dependent maps have been added or added dependent maps have 148 // been rolled back or committed. 149 for (int i = 0; i < DependentCode::kGroupCount; i++) { 150 ASSERT_EQ(NULL, dependencies_[i]); 151 } 152 #endif // DEBUG 153 } 154 155 156 void CompilationInfo::CommitDependencies(Handle<Code> code) { 157 for (int i = 0; i < DependentCode::kGroupCount; i++) { 158 ZoneList<Handle<HeapObject> >* group_objects = dependencies_[i]; 159 if (group_objects == NULL) continue; 160 ASSERT(!object_wrapper_.is_null()); 161 for (int j = 0; j < group_objects->length(); j++) { 162 DependentCode::DependencyGroup group = 163 static_cast<DependentCode::DependencyGroup>(i); 164 DependentCode* dependent_code = 165 DependentCode::ForObject(group_objects->at(j), group); 166 dependent_code->UpdateToFinishedCode(group, this, *code); 167 } 168 dependencies_[i] = NULL; // Zone-allocated, no need to delete. 169 } 170 } 171 172 173 void CompilationInfo::RollbackDependencies() { 174 // Unregister from all dependent maps if not yet committed. 175 for (int i = 0; i < DependentCode::kGroupCount; i++) { 176 ZoneList<Handle<HeapObject> >* group_objects = dependencies_[i]; 177 if (group_objects == NULL) continue; 178 for (int j = 0; j < group_objects->length(); j++) { 179 DependentCode::DependencyGroup group = 180 static_cast<DependentCode::DependencyGroup>(i); 181 DependentCode* dependent_code = 182 DependentCode::ForObject(group_objects->at(j), group); 183 dependent_code->RemoveCompilationInfo(group, this); 184 } 185 dependencies_[i] = NULL; // Zone-allocated, no need to delete. 186 } 187 } 188 189 190 int CompilationInfo::num_parameters() const { 191 if (IsStub()) { 192 ASSERT(parameter_count_ > 0); 193 return parameter_count_; 194 } else { 195 return scope()->num_parameters(); 196 } 197 } 198 199 200 int CompilationInfo::num_heap_slots() const { 201 if (IsStub()) { 202 return 0; 203 } else { 204 return scope()->num_heap_slots(); 205 } 206 } 207 208 209 Code::Flags CompilationInfo::flags() const { 210 if (IsStub()) { 211 return Code::ComputeFlags(code_stub()->GetCodeKind(), 212 code_stub()->GetICState(), 213 code_stub()->GetExtraICState(), 214 code_stub()->GetStubType(), 215 code_stub()->GetStubFlags()); 216 } else { 217 return Code::ComputeFlags(Code::OPTIMIZED_FUNCTION); 218 } 219 } 220 221 222 // Disable optimization for the rest of the compilation pipeline. 223 void CompilationInfo::DisableOptimization() { 224 bool is_optimizable_closure = 225 FLAG_optimize_closures && 226 closure_.is_null() && 227 !scope_->HasTrivialOuterContext() && 228 !scope_->outer_scope_calls_non_strict_eval() && 229 !scope_->inside_with(); 230 SetMode(is_optimizable_closure ? BASE : NONOPT); 231 } 232 233 234 // Primitive functions are unlikely to be picked up by the stack-walking 235 // profiler, so they trigger their own optimization when they're called 236 // for the SharedFunctionInfo::kCallsUntilPrimitiveOptimization-th time. 237 bool CompilationInfo::ShouldSelfOptimize() { 238 return FLAG_self_optimization && 239 FLAG_crankshaft && 240 !function()->flags()->Contains(kDontSelfOptimize) && 241 !function()->dont_optimize() && 242 function()->scope()->AllowsLazyCompilation() && 243 (shared_info().is_null() || !shared_info()->optimization_disabled()); 244 } 245 246 247 // Determine whether to use the full compiler for all code. If the flag 248 // --always-full-compiler is specified this is the case. For the virtual frame 249 // based compiler the full compiler is also used if a debugger is connected, as 250 // the code from the full compiler supports mode precise break points. For the 251 // crankshaft adaptive compiler debugging the optimized code is not possible at 252 // all. However crankshaft support recompilation of functions, so in this case 253 // the full compiler need not be be used if a debugger is attached, but only if 254 // break points has actually been set. 255 static bool IsDebuggerActive(Isolate* isolate) { 256 #ifdef ENABLE_DEBUGGER_SUPPORT 257 return isolate->use_crankshaft() ? 258 isolate->debug()->has_break_points() : 259 isolate->debugger()->IsDebuggerActive(); 260 #else 261 return false; 262 #endif 263 } 264 265 266 static bool AlwaysFullCompiler(Isolate* isolate) { 267 return FLAG_always_full_compiler || IsDebuggerActive(isolate); 268 } 269 270 271 void RecompileJob::RecordOptimizationStats() { 272 Handle<JSFunction> function = info()->closure(); 273 if (!function->IsOptimized()) { 274 // Concurrent recompilation and OSR may race. Increment only once. 275 int opt_count = function->shared()->opt_count(); 276 function->shared()->set_opt_count(opt_count + 1); 277 } 278 double ms_creategraph = time_taken_to_create_graph_.InMillisecondsF(); 279 double ms_optimize = time_taken_to_optimize_.InMillisecondsF(); 280 double ms_codegen = time_taken_to_codegen_.InMillisecondsF(); 281 if (FLAG_trace_opt) { 282 PrintF("[optimizing "); 283 function->ShortPrint(); 284 PrintF(" - took %0.3f, %0.3f, %0.3f ms]\n", ms_creategraph, ms_optimize, 285 ms_codegen); 286 } 287 if (FLAG_trace_opt_stats) { 288 static double compilation_time = 0.0; 289 static int compiled_functions = 0; 290 static int code_size = 0; 291 292 compilation_time += (ms_creategraph + ms_optimize + ms_codegen); 293 compiled_functions++; 294 code_size += function->shared()->SourceSize(); 295 PrintF("Compiled: %d functions with %d byte source size in %fms.\n", 296 compiled_functions, 297 code_size, 298 compilation_time); 299 } 300 if (FLAG_hydrogen_stats) { 301 isolate()->GetHStatistics()->IncrementSubtotals(time_taken_to_create_graph_, 302 time_taken_to_optimize_, 303 time_taken_to_codegen_); 304 } 305 } 306 307 308 // A return value of true indicates the compilation pipeline is still 309 // going, not necessarily that we optimized the code. 310 static bool MakeCrankshaftCode(CompilationInfo* info) { 311 RecompileJob job(info); 312 RecompileJob::Status status = job.CreateGraph(); 313 314 if (status != RecompileJob::SUCCEEDED) { 315 return status != RecompileJob::FAILED; 316 } 317 status = job.OptimizeGraph(); 318 if (status != RecompileJob::SUCCEEDED) { 319 status = job.AbortOptimization(); 320 return status != RecompileJob::FAILED; 321 } 322 status = job.GenerateAndInstallCode(); 323 return status != RecompileJob::FAILED; 324 } 325 326 327 class HOptimizedGraphBuilderWithPositions: public HOptimizedGraphBuilder { 328 public: 329 explicit HOptimizedGraphBuilderWithPositions(CompilationInfo* info) 330 : HOptimizedGraphBuilder(info) { 331 } 332 333 #define DEF_VISIT(type) \ 334 virtual void Visit##type(type* node) V8_OVERRIDE { \ 335 if (node->position() != RelocInfo::kNoPosition) { \ 336 SetSourcePosition(node->position()); \ 337 } \ 338 HOptimizedGraphBuilder::Visit##type(node); \ 339 } 340 EXPRESSION_NODE_LIST(DEF_VISIT) 341 #undef DEF_VISIT 342 343 #define DEF_VISIT(type) \ 344 virtual void Visit##type(type* node) V8_OVERRIDE { \ 345 if (node->position() != RelocInfo::kNoPosition) { \ 346 SetSourcePosition(node->position()); \ 347 } \ 348 HOptimizedGraphBuilder::Visit##type(node); \ 349 } 350 STATEMENT_NODE_LIST(DEF_VISIT) 351 #undef DEF_VISIT 352 353 #define DEF_VISIT(type) \ 354 virtual void Visit##type(type* node) V8_OVERRIDE { \ 355 HOptimizedGraphBuilder::Visit##type(node); \ 356 } 357 MODULE_NODE_LIST(DEF_VISIT) 358 DECLARATION_NODE_LIST(DEF_VISIT) 359 AUXILIARY_NODE_LIST(DEF_VISIT) 360 #undef DEF_VISIT 361 }; 362 363 364 RecompileJob::Status RecompileJob::CreateGraph() { 365 ASSERT(isolate()->use_crankshaft()); 366 ASSERT(info()->IsOptimizing()); 367 ASSERT(!info()->IsCompilingForDebugging()); 368 369 // We should never arrive here if there is no code object on the 370 // shared function object. 371 ASSERT(info()->shared_info()->code()->kind() == Code::FUNCTION); 372 373 // We should never arrive here if optimization has been disabled on the 374 // shared function info. 375 ASSERT(!info()->shared_info()->optimization_disabled()); 376 377 // Fall back to using the full code generator if it's not possible 378 // to use the Hydrogen-based optimizing compiler. We already have 379 // generated code for this from the shared function object. 380 if (AlwaysFullCompiler(isolate())) { 381 info()->AbortOptimization(); 382 return SetLastStatus(BAILED_OUT); 383 } 384 385 // Limit the number of times we re-compile a functions with 386 // the optimizing compiler. 387 const int kMaxOptCount = 388 FLAG_deopt_every_n_times == 0 ? FLAG_max_opt_count : 1000; 389 if (info()->opt_count() > kMaxOptCount) { 390 info()->set_bailout_reason(kOptimizedTooManyTimes); 391 return AbortOptimization(); 392 } 393 394 // Due to an encoding limit on LUnallocated operands in the Lithium 395 // language, we cannot optimize functions with too many formal parameters 396 // or perform on-stack replacement for function with too many 397 // stack-allocated local variables. 398 // 399 // The encoding is as a signed value, with parameters and receiver using 400 // the negative indices and locals the non-negative ones. 401 const int parameter_limit = -LUnallocated::kMinFixedSlotIndex; 402 Scope* scope = info()->scope(); 403 if ((scope->num_parameters() + 1) > parameter_limit) { 404 info()->set_bailout_reason(kTooManyParameters); 405 return AbortOptimization(); 406 } 407 408 const int locals_limit = LUnallocated::kMaxFixedSlotIndex; 409 if (info()->is_osr() && 410 scope->num_parameters() + 1 + scope->num_stack_slots() > locals_limit) { 411 info()->set_bailout_reason(kTooManyParametersLocals); 412 return AbortOptimization(); 413 } 414 415 // Take --hydrogen-filter into account. 416 if (!info()->closure()->PassesFilter(FLAG_hydrogen_filter)) { 417 info()->AbortOptimization(); 418 return SetLastStatus(BAILED_OUT); 419 } 420 421 // Recompile the unoptimized version of the code if the current version 422 // doesn't have deoptimization support. Alternatively, we may decide to 423 // run the full code generator to get a baseline for the compile-time 424 // performance of the hydrogen-based compiler. 425 bool should_recompile = !info()->shared_info()->has_deoptimization_support(); 426 if (should_recompile || FLAG_hydrogen_stats) { 427 ElapsedTimer timer; 428 if (FLAG_hydrogen_stats) { 429 timer.Start(); 430 } 431 CompilationInfoWithZone unoptimized(info()->shared_info()); 432 // Note that we use the same AST that we will use for generating the 433 // optimized code. 434 unoptimized.SetFunction(info()->function()); 435 unoptimized.SetScope(info()->scope()); 436 unoptimized.SetContext(info()->context()); 437 if (should_recompile) unoptimized.EnableDeoptimizationSupport(); 438 bool succeeded = FullCodeGenerator::MakeCode(&unoptimized); 439 if (should_recompile) { 440 if (!succeeded) return SetLastStatus(FAILED); 441 Handle<SharedFunctionInfo> shared = info()->shared_info(); 442 shared->EnableDeoptimizationSupport(*unoptimized.code()); 443 // The existing unoptimized code was replaced with the new one. 444 Compiler::RecordFunctionCompilation( 445 Logger::LAZY_COMPILE_TAG, &unoptimized, shared); 446 } 447 if (FLAG_hydrogen_stats) { 448 isolate()->GetHStatistics()->IncrementFullCodeGen(timer.Elapsed()); 449 } 450 } 451 452 // Check that the unoptimized, shared code is ready for 453 // optimizations. When using the always_opt flag we disregard the 454 // optimizable marker in the code object and optimize anyway. This 455 // is safe as long as the unoptimized code has deoptimization 456 // support. 457 ASSERT(FLAG_always_opt || info()->shared_info()->code()->optimizable()); 458 ASSERT(info()->shared_info()->has_deoptimization_support()); 459 460 if (FLAG_trace_hydrogen) { 461 Handle<String> name = info()->function()->debug_name(); 462 PrintF("-----------------------------------------------------------\n"); 463 PrintF("Compiling method %s using hydrogen\n", *name->ToCString()); 464 isolate()->GetHTracer()->TraceCompilation(info()); 465 } 466 467 // Type-check the function. 468 AstTyper::Run(info()); 469 470 graph_builder_ = FLAG_emit_opt_code_positions 471 ? new(info()->zone()) HOptimizedGraphBuilderWithPositions(info()) 472 : new(info()->zone()) HOptimizedGraphBuilder(info()); 473 474 Timer t(this, &time_taken_to_create_graph_); 475 graph_ = graph_builder_->CreateGraph(); 476 477 if (isolate()->has_pending_exception()) { 478 info()->SetCode(Handle<Code>::null()); 479 return SetLastStatus(FAILED); 480 } 481 482 // The function being compiled may have bailed out due to an inline 483 // candidate bailing out. In such a case, we don't disable 484 // optimization on the shared_info. 485 ASSERT(!graph_builder_->inline_bailout() || graph_ == NULL); 486 if (graph_ == NULL) { 487 if (graph_builder_->inline_bailout()) { 488 info_->AbortOptimization(); 489 return SetLastStatus(BAILED_OUT); 490 } else { 491 return AbortOptimization(); 492 } 493 } 494 495 if (info()->HasAbortedDueToDependencyChange()) { 496 info_->set_bailout_reason(kBailedOutDueToDependencyChange); 497 info_->AbortOptimization(); 498 return SetLastStatus(BAILED_OUT); 499 } 500 501 return SetLastStatus(SUCCEEDED); 502 } 503 504 505 RecompileJob::Status RecompileJob::OptimizeGraph() { 506 DisallowHeapAllocation no_allocation; 507 DisallowHandleAllocation no_handles; 508 DisallowHandleDereference no_deref; 509 DisallowCodeDependencyChange no_dependency_change; 510 511 ASSERT(last_status() == SUCCEEDED); 512 Timer t(this, &time_taken_to_optimize_); 513 ASSERT(graph_ != NULL); 514 BailoutReason bailout_reason = kNoReason; 515 if (!graph_->Optimize(&bailout_reason)) { 516 if (bailout_reason != kNoReason) graph_builder_->Bailout(bailout_reason); 517 return SetLastStatus(BAILED_OUT); 518 } else { 519 chunk_ = LChunk::NewChunk(graph_); 520 if (chunk_ == NULL) { 521 return SetLastStatus(BAILED_OUT); 522 } 523 } 524 return SetLastStatus(SUCCEEDED); 525 } 526 527 528 RecompileJob::Status RecompileJob::GenerateAndInstallCode() { 529 ASSERT(last_status() == SUCCEEDED); 530 ASSERT(!info()->HasAbortedDueToDependencyChange()); 531 DisallowCodeDependencyChange no_dependency_change; 532 { // Scope for timer. 533 Timer timer(this, &time_taken_to_codegen_); 534 ASSERT(chunk_ != NULL); 535 ASSERT(graph_ != NULL); 536 // Deferred handles reference objects that were accessible during 537 // graph creation. To make sure that we don't encounter inconsistencies 538 // between graph creation and code generation, we disallow accessing 539 // objects through deferred handles during the latter, with exceptions. 540 DisallowDeferredHandleDereference no_deferred_handle_deref; 541 Handle<Code> optimized_code = chunk_->Codegen(); 542 if (optimized_code.is_null()) { 543 if (info()->bailout_reason() == kNoReason) { 544 info()->set_bailout_reason(kCodeGenerationFailed); 545 } 546 return AbortOptimization(); 547 } 548 info()->SetCode(optimized_code); 549 } 550 RecordOptimizationStats(); 551 // Add to the weak list of optimized code objects. 552 info()->context()->native_context()->AddOptimizedCode(*info()->code()); 553 return SetLastStatus(SUCCEEDED); 554 } 555 556 557 static bool GenerateCode(CompilationInfo* info) { 558 bool is_optimizing = info->isolate()->use_crankshaft() && 559 !info->IsCompilingForDebugging() && 560 info->IsOptimizing(); 561 if (is_optimizing) { 562 Logger::TimerEventScope timer( 563 info->isolate(), Logger::TimerEventScope::v8_recompile_synchronous); 564 return MakeCrankshaftCode(info); 565 } else { 566 if (info->IsOptimizing()) { 567 // Have the CompilationInfo decide if the compilation should be 568 // BASE or NONOPT. 569 info->DisableOptimization(); 570 } 571 Logger::TimerEventScope timer( 572 info->isolate(), Logger::TimerEventScope::v8_compile_full_code); 573 return FullCodeGenerator::MakeCode(info); 574 } 575 } 576 577 578 static bool MakeCode(CompilationInfo* info) { 579 // Precondition: code has been parsed. Postcondition: the code field in 580 // the compilation info is set if compilation succeeded. 581 ASSERT(info->function() != NULL); 582 return Rewriter::Rewrite(info) && Scope::Analyze(info) && GenerateCode(info); 583 } 584 585 586 #ifdef ENABLE_DEBUGGER_SUPPORT 587 bool Compiler::MakeCodeForLiveEdit(CompilationInfo* info) { 588 // Precondition: code has been parsed. Postcondition: the code field in 589 // the compilation info is set if compilation succeeded. 590 bool succeeded = MakeCode(info); 591 if (!info->shared_info().is_null()) { 592 Handle<ScopeInfo> scope_info = ScopeInfo::Create(info->scope(), 593 info->zone()); 594 info->shared_info()->set_scope_info(*scope_info); 595 } 596 return succeeded; 597 } 598 #endif 599 600 601 static bool DebuggerWantsEagerCompilation(CompilationInfo* info, 602 bool allow_lazy_without_ctx = false) { 603 return LiveEditFunctionTracker::IsActive(info->isolate()) || 604 (info->isolate()->DebuggerHasBreakPoints() && !allow_lazy_without_ctx); 605 } 606 607 608 // Sets the expected number of properties based on estimate from compiler. 609 void SetExpectedNofPropertiesFromEstimate(Handle<SharedFunctionInfo> shared, 610 int estimate) { 611 // See the comment in SetExpectedNofProperties. 612 if (shared->live_objects_may_exist()) return; 613 614 // If no properties are added in the constructor, they are more likely 615 // to be added later. 616 if (estimate == 0) estimate = 2; 617 618 // TODO(yangguo): check whether those heuristics are still up-to-date. 619 // We do not shrink objects that go into a snapshot (yet), so we adjust 620 // the estimate conservatively. 621 if (Serializer::enabled()) { 622 estimate += 2; 623 } else if (FLAG_clever_optimizations) { 624 // Inobject slack tracking will reclaim redundant inobject space later, 625 // so we can afford to adjust the estimate generously. 626 estimate += 8; 627 } else { 628 estimate += 3; 629 } 630 631 shared->set_expected_nof_properties(estimate); 632 } 633 634 635 static Handle<SharedFunctionInfo> MakeFunctionInfo(CompilationInfo* info) { 636 Isolate* isolate = info->isolate(); 637 PostponeInterruptsScope postpone(isolate); 638 639 ASSERT(!isolate->native_context().is_null()); 640 Handle<Script> script = info->script(); 641 // TODO(svenpanne) Obscure place for this, perhaps move to OnBeforeCompile? 642 FixedArray* array = isolate->native_context()->embedder_data(); 643 script->set_context_data(array->get(0)); 644 645 #ifdef ENABLE_DEBUGGER_SUPPORT 646 if (info->is_eval()) { 647 script->set_compilation_type(Script::COMPILATION_TYPE_EVAL); 648 // For eval scripts add information on the function from which eval was 649 // called. 650 if (info->is_eval()) { 651 StackTraceFrameIterator it(isolate); 652 if (!it.done()) { 653 script->set_eval_from_shared(it.frame()->function()->shared()); 654 Code* code = it.frame()->LookupCode(); 655 int offset = static_cast<int>( 656 it.frame()->pc() - code->instruction_start()); 657 script->set_eval_from_instructions_offset(Smi::FromInt(offset)); 658 } 659 } 660 } 661 662 // Notify debugger 663 isolate->debugger()->OnBeforeCompile(script); 664 #endif 665 666 // Only allow non-global compiles for eval. 667 ASSERT(info->is_eval() || info->is_global()); 668 { 669 Parser parser(info); 670 if ((info->pre_parse_data() != NULL || 671 String::cast(script->source())->length() > FLAG_min_preparse_length) && 672 !DebuggerWantsEagerCompilation(info)) 673 parser.set_allow_lazy(true); 674 if (!parser.Parse()) { 675 return Handle<SharedFunctionInfo>::null(); 676 } 677 } 678 679 FunctionLiteral* lit = info->function(); 680 LiveEditFunctionTracker live_edit_tracker(isolate, lit); 681 Handle<SharedFunctionInfo> result; 682 { 683 // Measure how long it takes to do the compilation; only take the 684 // rest of the function into account to avoid overlap with the 685 // parsing statistics. 686 HistogramTimer* rate = info->is_eval() 687 ? info->isolate()->counters()->compile_eval() 688 : info->isolate()->counters()->compile(); 689 HistogramTimerScope timer(rate); 690 691 // Compile the code. 692 if (!MakeCode(info)) { 693 if (!isolate->has_pending_exception()) isolate->StackOverflow(); 694 return Handle<SharedFunctionInfo>::null(); 695 } 696 697 // Allocate function. 698 ASSERT(!info->code().is_null()); 699 result = 700 isolate->factory()->NewSharedFunctionInfo( 701 lit->name(), 702 lit->materialized_literal_count(), 703 lit->is_generator(), 704 info->code(), 705 ScopeInfo::Create(info->scope(), info->zone())); 706 707 ASSERT_EQ(RelocInfo::kNoPosition, lit->function_token_position()); 708 Compiler::SetFunctionInfo(result, lit, true, script); 709 710 if (script->name()->IsString()) { 711 PROFILE(isolate, CodeCreateEvent( 712 info->is_eval() 713 ? Logger::EVAL_TAG 714 : Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script), 715 *info->code(), 716 *result, 717 info, 718 String::cast(script->name()))); 719 GDBJIT(AddCode(Handle<String>(String::cast(script->name())), 720 script, 721 info->code(), 722 info)); 723 } else { 724 PROFILE(isolate, CodeCreateEvent( 725 info->is_eval() 726 ? Logger::EVAL_TAG 727 : Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script), 728 *info->code(), 729 *result, 730 info, 731 isolate->heap()->empty_string())); 732 GDBJIT(AddCode(Handle<String>(), script, info->code(), info)); 733 } 734 735 // Hint to the runtime system used when allocating space for initial 736 // property space by setting the expected number of properties for 737 // the instances of the function. 738 SetExpectedNofPropertiesFromEstimate(result, 739 lit->expected_property_count()); 740 741 script->set_compilation_state(Script::COMPILATION_STATE_COMPILED); 742 } 743 744 #ifdef ENABLE_DEBUGGER_SUPPORT 745 // Notify debugger 746 isolate->debugger()->OnAfterCompile( 747 script, Debugger::NO_AFTER_COMPILE_FLAGS); 748 #endif 749 750 live_edit_tracker.RecordFunctionInfo(result, lit, info->zone()); 751 752 return result; 753 } 754 755 756 Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source, 757 Handle<Object> script_name, 758 int line_offset, 759 int column_offset, 760 bool is_shared_cross_origin, 761 Handle<Context> context, 762 v8::Extension* extension, 763 ScriptDataImpl* pre_data, 764 Handle<Object> script_data, 765 NativesFlag natives) { 766 Isolate* isolate = source->GetIsolate(); 767 int source_length = source->length(); 768 isolate->counters()->total_load_size()->Increment(source_length); 769 isolate->counters()->total_compile_size()->Increment(source_length); 770 771 // The VM is in the COMPILER state until exiting this function. 772 VMState<COMPILER> state(isolate); 773 774 CompilationCache* compilation_cache = isolate->compilation_cache(); 775 776 // Do a lookup in the compilation cache but not for extensions. 777 Handle<SharedFunctionInfo> result; 778 if (extension == NULL) { 779 result = compilation_cache->LookupScript(source, 780 script_name, 781 line_offset, 782 column_offset, 783 is_shared_cross_origin, 784 context); 785 } 786 787 if (result.is_null()) { 788 // No cache entry found. Do pre-parsing, if it makes sense, and compile 789 // the script. 790 // Building preparse data that is only used immediately after is only a 791 // saving if we might skip building the AST for lazily compiled functions. 792 // I.e., preparse data isn't relevant when the lazy flag is off, and 793 // for small sources, odds are that there aren't many functions 794 // that would be compiled lazily anyway, so we skip the preparse step 795 // in that case too. 796 797 // Create a script object describing the script to be compiled. 798 Handle<Script> script = isolate->factory()->NewScript(source); 799 if (natives == NATIVES_CODE) { 800 script->set_type(Smi::FromInt(Script::TYPE_NATIVE)); 801 } 802 if (!script_name.is_null()) { 803 script->set_name(*script_name); 804 script->set_line_offset(Smi::FromInt(line_offset)); 805 script->set_column_offset(Smi::FromInt(column_offset)); 806 } 807 script->set_is_shared_cross_origin(is_shared_cross_origin); 808 809 script->set_data(script_data.is_null() ? isolate->heap()->undefined_value() 810 : *script_data); 811 812 // Compile the function and add it to the cache. 813 CompilationInfoWithZone info(script); 814 info.MarkAsGlobal(); 815 info.SetExtension(extension); 816 info.SetPreParseData(pre_data); 817 info.SetContext(context); 818 if (FLAG_use_strict) { 819 info.SetLanguageMode(FLAG_harmony_scoping ? EXTENDED_MODE : STRICT_MODE); 820 } 821 result = MakeFunctionInfo(&info); 822 if (extension == NULL && !result.is_null() && !result->dont_cache()) { 823 compilation_cache->PutScript(source, context, result); 824 } 825 } else { 826 if (result->ic_age() != isolate->heap()->global_ic_age()) { 827 result->ResetForNewContext(isolate->heap()->global_ic_age()); 828 } 829 } 830 831 if (result.is_null()) isolate->ReportPendingMessages(); 832 return result; 833 } 834 835 836 Handle<SharedFunctionInfo> Compiler::CompileEval(Handle<String> source, 837 Handle<Context> context, 838 bool is_global, 839 LanguageMode language_mode, 840 ParseRestriction restriction, 841 int scope_position) { 842 Isolate* isolate = source->GetIsolate(); 843 int source_length = source->length(); 844 isolate->counters()->total_eval_size()->Increment(source_length); 845 isolate->counters()->total_compile_size()->Increment(source_length); 846 847 // The VM is in the COMPILER state until exiting this function. 848 VMState<COMPILER> state(isolate); 849 850 // Do a lookup in the compilation cache; if the entry is not there, invoke 851 // the compiler and add the result to the cache. 852 Handle<SharedFunctionInfo> result; 853 CompilationCache* compilation_cache = isolate->compilation_cache(); 854 result = compilation_cache->LookupEval(source, 855 context, 856 is_global, 857 language_mode, 858 scope_position); 859 860 if (result.is_null()) { 861 // Create a script object describing the script to be compiled. 862 Handle<Script> script = isolate->factory()->NewScript(source); 863 CompilationInfoWithZone info(script); 864 info.MarkAsEval(); 865 if (is_global) info.MarkAsGlobal(); 866 info.SetLanguageMode(language_mode); 867 info.SetParseRestriction(restriction); 868 info.SetContext(context); 869 result = MakeFunctionInfo(&info); 870 if (!result.is_null()) { 871 // Explicitly disable optimization for eval code. We're not yet prepared 872 // to handle eval-code in the optimizing compiler. 873 result->DisableOptimization(kEval); 874 875 // If caller is strict mode, the result must be in strict mode or 876 // extended mode as well, but not the other way around. Consider: 877 // eval("'use strict'; ..."); 878 ASSERT(language_mode != STRICT_MODE || !result->is_classic_mode()); 879 // If caller is in extended mode, the result must also be in 880 // extended mode. 881 ASSERT(language_mode != EXTENDED_MODE || 882 result->is_extended_mode()); 883 if (!result->dont_cache()) { 884 compilation_cache->PutEval( 885 source, context, is_global, result, scope_position); 886 } 887 } 888 } else { 889 if (result->ic_age() != isolate->heap()->global_ic_age()) { 890 result->ResetForNewContext(isolate->heap()->global_ic_age()); 891 } 892 } 893 894 return result; 895 } 896 897 898 static bool InstallFullCode(CompilationInfo* info) { 899 // Update the shared function info with the compiled code and the 900 // scope info. Please note, that the order of the shared function 901 // info initialization is important since set_scope_info might 902 // trigger a GC, causing the ASSERT below to be invalid if the code 903 // was flushed. By setting the code object last we avoid this. 904 Handle<SharedFunctionInfo> shared = info->shared_info(); 905 Handle<Code> code = info->code(); 906 CHECK(code->kind() == Code::FUNCTION); 907 Handle<JSFunction> function = info->closure(); 908 Handle<ScopeInfo> scope_info = 909 ScopeInfo::Create(info->scope(), info->zone()); 910 shared->set_scope_info(*scope_info); 911 shared->ReplaceCode(*code); 912 if (!function.is_null()) { 913 function->ReplaceCode(*code); 914 ASSERT(!function->IsOptimized()); 915 } 916 917 // Set the expected number of properties for instances. 918 FunctionLiteral* lit = info->function(); 919 int expected = lit->expected_property_count(); 920 SetExpectedNofPropertiesFromEstimate(shared, expected); 921 922 // Check the function has compiled code. 923 ASSERT(shared->is_compiled()); 924 shared->set_dont_optimize_reason(lit->dont_optimize_reason()); 925 shared->set_dont_inline(lit->flags()->Contains(kDontInline)); 926 shared->set_ast_node_count(lit->ast_node_count()); 927 928 if (info->isolate()->use_crankshaft() && 929 !function.is_null() && 930 !shared->optimization_disabled()) { 931 // If we're asked to always optimize, we compile the optimized 932 // version of the function right away - unless the debugger is 933 // active as it makes no sense to compile optimized code then. 934 if (FLAG_always_opt && 935 !info->isolate()->DebuggerHasBreakPoints()) { 936 CompilationInfoWithZone optimized(function); 937 optimized.SetOptimizing(BailoutId::None()); 938 return Compiler::CompileLazy(&optimized); 939 } 940 } 941 return true; 942 } 943 944 945 static void InstallCodeCommon(CompilationInfo* info) { 946 Handle<SharedFunctionInfo> shared = info->shared_info(); 947 Handle<Code> code = info->code(); 948 ASSERT(!code.is_null()); 949 950 // Set optimizable to false if this is disallowed by the shared 951 // function info, e.g., we might have flushed the code and must 952 // reset this bit when lazy compiling the code again. 953 if (shared->optimization_disabled()) code->set_optimizable(false); 954 955 if (shared->code() == *code) { 956 // Do not send compilation event for the same code twice. 957 return; 958 } 959 Compiler::RecordFunctionCompilation(Logger::LAZY_COMPILE_TAG, info, shared); 960 } 961 962 963 static void InsertCodeIntoOptimizedCodeMap(CompilationInfo* info) { 964 Handle<Code> code = info->code(); 965 if (code->kind() != Code::OPTIMIZED_FUNCTION) return; // Nothing to do. 966 967 // Cache non-OSR optimized code. 968 if (FLAG_cache_optimized_code && !info->is_osr()) { 969 Handle<JSFunction> function = info->closure(); 970 Handle<SharedFunctionInfo> shared(function->shared()); 971 Handle<FixedArray> literals(function->literals()); 972 Handle<Context> native_context(function->context()->native_context()); 973 SharedFunctionInfo::AddToOptimizedCodeMap( 974 shared, native_context, code, literals); 975 } 976 } 977 978 979 static bool InstallCodeFromOptimizedCodeMap(CompilationInfo* info) { 980 if (!info->IsOptimizing()) return false; // Nothing to look up. 981 982 // Lookup non-OSR optimized code. 983 if (FLAG_cache_optimized_code && !info->is_osr()) { 984 Handle<SharedFunctionInfo> shared = info->shared_info(); 985 Handle<JSFunction> function = info->closure(); 986 ASSERT(!function.is_null()); 987 Handle<Context> native_context(function->context()->native_context()); 988 int index = shared->SearchOptimizedCodeMap(*native_context); 989 if (index > 0) { 990 if (FLAG_trace_opt) { 991 PrintF("[found optimized code for "); 992 function->ShortPrint(); 993 PrintF("]\n"); 994 } 995 // Caching of optimized code enabled and optimized code found. 996 shared->InstallFromOptimizedCodeMap(*function, index); 997 return true; 998 } 999 } 1000 return false; 1001 } 1002 1003 1004 bool Compiler::CompileLazy(CompilationInfo* info) { 1005 Isolate* isolate = info->isolate(); 1006 1007 // The VM is in the COMPILER state until exiting this function. 1008 VMState<COMPILER> state(isolate); 1009 1010 PostponeInterruptsScope postpone(isolate); 1011 1012 Handle<SharedFunctionInfo> shared = info->shared_info(); 1013 int compiled_size = shared->end_position() - shared->start_position(); 1014 isolate->counters()->total_compile_size()->Increment(compiled_size); 1015 1016 if (InstallCodeFromOptimizedCodeMap(info)) return true; 1017 1018 // Generate the AST for the lazily compiled function. 1019 if (Parser::Parse(info)) { 1020 // Measure how long it takes to do the lazy compilation; only take the 1021 // rest of the function into account to avoid overlap with the lazy 1022 // parsing statistics. 1023 HistogramTimerScope timer(isolate->counters()->compile_lazy()); 1024 1025 // After parsing we know the function's language mode. Remember it. 1026 LanguageMode language_mode = info->function()->language_mode(); 1027 info->SetLanguageMode(language_mode); 1028 shared->set_language_mode(language_mode); 1029 1030 // Compile the code. 1031 if (!MakeCode(info)) { 1032 if (!isolate->has_pending_exception()) { 1033 isolate->StackOverflow(); 1034 } 1035 } else { 1036 InstallCodeCommon(info); 1037 1038 if (info->IsOptimizing()) { 1039 // Optimized code successfully created. 1040 Handle<Code> code = info->code(); 1041 ASSERT(shared->scope_info() != ScopeInfo::Empty(isolate)); 1042 // TODO(titzer): Only replace the code if it was not an OSR compile. 1043 info->closure()->ReplaceCode(*code); 1044 InsertCodeIntoOptimizedCodeMap(info); 1045 return true; 1046 } else if (!info->is_osr()) { 1047 // Compilation failed. Replace with full code if not OSR compile. 1048 return InstallFullCode(info); 1049 } 1050 } 1051 } 1052 1053 ASSERT(info->code().is_null()); 1054 return false; 1055 } 1056 1057 1058 bool Compiler::RecompileConcurrent(Handle<JSFunction> closure, 1059 uint32_t osr_pc_offset) { 1060 bool compiling_for_osr = (osr_pc_offset != 0); 1061 1062 Isolate* isolate = closure->GetIsolate(); 1063 // Here we prepare compile data for the concurrent recompilation thread, but 1064 // this still happens synchronously and interrupts execution. 1065 Logger::TimerEventScope timer( 1066 isolate, Logger::TimerEventScope::v8_recompile_synchronous); 1067 1068 if (!isolate->optimizing_compiler_thread()->IsQueueAvailable()) { 1069 if (FLAG_trace_concurrent_recompilation) { 1070 PrintF(" ** Compilation queue full, will retry optimizing "); 1071 closure->PrintName(); 1072 PrintF(" on next run.\n"); 1073 } 1074 return false; 1075 } 1076 1077 SmartPointer<CompilationInfo> info(new CompilationInfoWithZone(closure)); 1078 Handle<SharedFunctionInfo> shared = info->shared_info(); 1079 1080 if (compiling_for_osr) { 1081 BailoutId osr_ast_id = 1082 shared->code()->TranslatePcOffsetToAstId(osr_pc_offset); 1083 ASSERT(!osr_ast_id.IsNone()); 1084 info->SetOptimizing(osr_ast_id); 1085 info->set_osr_pc_offset(osr_pc_offset); 1086 1087 if (FLAG_trace_osr) { 1088 PrintF("[COSR - attempt to queue "); 1089 closure->PrintName(); 1090 PrintF(" at AST id %d]\n", osr_ast_id.ToInt()); 1091 } 1092 } else { 1093 info->SetOptimizing(BailoutId::None()); 1094 } 1095 1096 VMState<COMPILER> state(isolate); 1097 PostponeInterruptsScope postpone(isolate); 1098 1099 int compiled_size = shared->end_position() - shared->start_position(); 1100 isolate->counters()->total_compile_size()->Increment(compiled_size); 1101 1102 { 1103 CompilationHandleScope handle_scope(*info); 1104 1105 if (!compiling_for_osr && InstallCodeFromOptimizedCodeMap(*info)) { 1106 return true; 1107 } 1108 1109 if (Parser::Parse(*info)) { 1110 LanguageMode language_mode = info->function()->language_mode(); 1111 info->SetLanguageMode(language_mode); 1112 shared->set_language_mode(language_mode); 1113 info->SaveHandles(); 1114 1115 if (Rewriter::Rewrite(*info) && Scope::Analyze(*info)) { 1116 RecompileJob* job = new(info->zone()) RecompileJob(*info); 1117 RecompileJob::Status status = job->CreateGraph(); 1118 if (status == RecompileJob::SUCCEEDED) { 1119 info.Detach(); 1120 shared->code()->set_profiler_ticks(0); 1121 isolate->optimizing_compiler_thread()->QueueForOptimization(job); 1122 ASSERT(!isolate->has_pending_exception()); 1123 return true; 1124 } else if (status == RecompileJob::BAILED_OUT) { 1125 isolate->clear_pending_exception(); 1126 InstallFullCode(*info); 1127 } 1128 } 1129 } 1130 } 1131 1132 if (isolate->has_pending_exception()) isolate->clear_pending_exception(); 1133 return false; 1134 } 1135 1136 1137 Handle<Code> Compiler::InstallOptimizedCode(RecompileJob* job) { 1138 SmartPointer<CompilationInfo> info(job->info()); 1139 // The function may have already been optimized by OSR. Simply continue. 1140 // Except when OSR already disabled optimization for some reason. 1141 if (info->shared_info()->optimization_disabled()) { 1142 info->AbortOptimization(); 1143 InstallFullCode(*info); 1144 if (FLAG_trace_concurrent_recompilation) { 1145 PrintF(" ** aborting optimization for "); 1146 info->closure()->PrintName(); 1147 PrintF(" as it has been disabled.\n"); 1148 } 1149 ASSERT(!info->closure()->IsInRecompileQueue()); 1150 return Handle<Code>::null(); 1151 } 1152 1153 Isolate* isolate = info->isolate(); 1154 VMState<COMPILER> state(isolate); 1155 Logger::TimerEventScope timer( 1156 isolate, Logger::TimerEventScope::v8_recompile_synchronous); 1157 // If crankshaft succeeded, install the optimized code else install 1158 // the unoptimized code. 1159 RecompileJob::Status status = job->last_status(); 1160 if (info->HasAbortedDueToDependencyChange()) { 1161 info->set_bailout_reason(kBailedOutDueToDependencyChange); 1162 status = job->AbortOptimization(); 1163 } else if (status != RecompileJob::SUCCEEDED) { 1164 info->set_bailout_reason(kFailedBailedOutLastTime); 1165 status = job->AbortOptimization(); 1166 } else if (isolate->DebuggerHasBreakPoints()) { 1167 info->set_bailout_reason(kDebuggerIsActive); 1168 status = job->AbortOptimization(); 1169 } else { 1170 status = job->GenerateAndInstallCode(); 1171 ASSERT(status == RecompileJob::SUCCEEDED || 1172 status == RecompileJob::BAILED_OUT); 1173 } 1174 1175 InstallCodeCommon(*info); 1176 if (status == RecompileJob::SUCCEEDED) { 1177 Handle<Code> code = info->code(); 1178 ASSERT(info->shared_info()->scope_info() != ScopeInfo::Empty(isolate)); 1179 info->closure()->ReplaceCode(*code); 1180 if (info->shared_info()->SearchOptimizedCodeMap( 1181 info->closure()->context()->native_context()) == -1) { 1182 InsertCodeIntoOptimizedCodeMap(*info); 1183 } 1184 if (FLAG_trace_concurrent_recompilation) { 1185 PrintF(" ** Optimized code for "); 1186 info->closure()->PrintName(); 1187 PrintF(" installed.\n"); 1188 } 1189 } else { 1190 info->AbortOptimization(); 1191 InstallFullCode(*info); 1192 } 1193 // Optimized code is finally replacing unoptimized code. Reset the latter's 1194 // profiler ticks to prevent too soon re-opt after a deopt. 1195 info->shared_info()->code()->set_profiler_ticks(0); 1196 ASSERT(!info->closure()->IsInRecompileQueue()); 1197 return (status == RecompileJob::SUCCEEDED) ? info->code() 1198 : Handle<Code>::null(); 1199 } 1200 1201 1202 Handle<SharedFunctionInfo> Compiler::BuildFunctionInfo(FunctionLiteral* literal, 1203 Handle<Script> script) { 1204 // Precondition: code has been parsed and scopes have been analyzed. 1205 CompilationInfoWithZone info(script); 1206 info.SetFunction(literal); 1207 info.SetScope(literal->scope()); 1208 info.SetLanguageMode(literal->scope()->language_mode()); 1209 1210 Isolate* isolate = info.isolate(); 1211 Factory* factory = isolate->factory(); 1212 LiveEditFunctionTracker live_edit_tracker(isolate, literal); 1213 // Determine if the function can be lazily compiled. This is necessary to 1214 // allow some of our builtin JS files to be lazily compiled. These 1215 // builtins cannot be handled lazily by the parser, since we have to know 1216 // if a function uses the special natives syntax, which is something the 1217 // parser records. 1218 // If the debugger requests compilation for break points, we cannot be 1219 // aggressive about lazy compilation, because it might trigger compilation 1220 // of functions without an outer context when setting a breakpoint through 1221 // Debug::FindSharedFunctionInfoInScript. 1222 bool allow_lazy_without_ctx = literal->AllowsLazyCompilationWithoutContext(); 1223 bool allow_lazy = literal->AllowsLazyCompilation() && 1224 !DebuggerWantsEagerCompilation(&info, allow_lazy_without_ctx); 1225 1226 Handle<ScopeInfo> scope_info(ScopeInfo::Empty(isolate)); 1227 1228 // Generate code 1229 if (FLAG_lazy && allow_lazy && !literal->is_parenthesized()) { 1230 Handle<Code> code = isolate->builtins()->LazyCompile(); 1231 info.SetCode(code); 1232 } else if (GenerateCode(&info)) { 1233 ASSERT(!info.code().is_null()); 1234 scope_info = ScopeInfo::Create(info.scope(), info.zone()); 1235 } else { 1236 return Handle<SharedFunctionInfo>::null(); 1237 } 1238 1239 // Create a shared function info object. 1240 Handle<SharedFunctionInfo> result = 1241 factory->NewSharedFunctionInfo(literal->name(), 1242 literal->materialized_literal_count(), 1243 literal->is_generator(), 1244 info.code(), 1245 scope_info); 1246 SetFunctionInfo(result, literal, false, script); 1247 RecordFunctionCompilation(Logger::FUNCTION_TAG, &info, result); 1248 result->set_allows_lazy_compilation(allow_lazy); 1249 result->set_allows_lazy_compilation_without_context(allow_lazy_without_ctx); 1250 1251 // Set the expected number of properties for instances and return 1252 // the resulting function. 1253 SetExpectedNofPropertiesFromEstimate(result, 1254 literal->expected_property_count()); 1255 live_edit_tracker.RecordFunctionInfo(result, literal, info.zone()); 1256 return result; 1257 } 1258 1259 1260 // Sets the function info on a function. 1261 // The start_position points to the first '(' character after the function name 1262 // in the full script source. When counting characters in the script source the 1263 // the first character is number 0 (not 1). 1264 void Compiler::SetFunctionInfo(Handle<SharedFunctionInfo> function_info, 1265 FunctionLiteral* lit, 1266 bool is_toplevel, 1267 Handle<Script> script) { 1268 function_info->set_length(lit->parameter_count()); 1269 function_info->set_formal_parameter_count(lit->parameter_count()); 1270 function_info->set_script(*script); 1271 function_info->set_function_token_position(lit->function_token_position()); 1272 function_info->set_start_position(lit->start_position()); 1273 function_info->set_end_position(lit->end_position()); 1274 function_info->set_is_expression(lit->is_expression()); 1275 function_info->set_is_anonymous(lit->is_anonymous()); 1276 function_info->set_is_toplevel(is_toplevel); 1277 function_info->set_inferred_name(*lit->inferred_name()); 1278 function_info->set_allows_lazy_compilation(lit->AllowsLazyCompilation()); 1279 function_info->set_allows_lazy_compilation_without_context( 1280 lit->AllowsLazyCompilationWithoutContext()); 1281 function_info->set_language_mode(lit->language_mode()); 1282 function_info->set_uses_arguments(lit->scope()->arguments() != NULL); 1283 function_info->set_has_duplicate_parameters(lit->has_duplicate_parameters()); 1284 function_info->set_ast_node_count(lit->ast_node_count()); 1285 function_info->set_is_function(lit->is_function()); 1286 function_info->set_dont_optimize_reason(lit->dont_optimize_reason()); 1287 function_info->set_dont_inline(lit->flags()->Contains(kDontInline)); 1288 function_info->set_dont_cache(lit->flags()->Contains(kDontCache)); 1289 function_info->set_is_generator(lit->is_generator()); 1290 } 1291 1292 1293 void Compiler::RecordFunctionCompilation(Logger::LogEventsAndTags tag, 1294 CompilationInfo* info, 1295 Handle<SharedFunctionInfo> shared) { 1296 // SharedFunctionInfo is passed separately, because if CompilationInfo 1297 // was created using Script object, it will not have it. 1298 1299 // Log the code generation. If source information is available include 1300 // script name and line number. Check explicitly whether logging is 1301 // enabled as finding the line number is not free. 1302 if (info->isolate()->logger()->is_logging_code_events() || 1303 info->isolate()->cpu_profiler()->is_profiling()) { 1304 Handle<Script> script = info->script(); 1305 Handle<Code> code = info->code(); 1306 if (*code == info->isolate()->builtins()->builtin(Builtins::kLazyCompile)) 1307 return; 1308 int line_num = GetScriptLineNumber(script, shared->start_position()) + 1; 1309 int column_num = 1310 GetScriptColumnNumber(script, shared->start_position()) + 1; 1311 USE(line_num); 1312 if (script->name()->IsString()) { 1313 PROFILE(info->isolate(), 1314 CodeCreateEvent(Logger::ToNativeByScript(tag, *script), 1315 *code, 1316 *shared, 1317 info, 1318 String::cast(script->name()), 1319 line_num, 1320 column_num)); 1321 } else { 1322 PROFILE(info->isolate(), 1323 CodeCreateEvent(Logger::ToNativeByScript(tag, *script), 1324 *code, 1325 *shared, 1326 info, 1327 info->isolate()->heap()->empty_string(), 1328 line_num, 1329 column_num)); 1330 } 1331 } 1332 1333 GDBJIT(AddCode(Handle<String>(shared->DebugName()), 1334 Handle<Script>(info->script()), 1335 Handle<Code>(info->code()), 1336 info)); 1337 } 1338 1339 1340 CompilationPhase::CompilationPhase(const char* name, CompilationInfo* info) 1341 : name_(name), info_(info), zone_(info->isolate()) { 1342 if (FLAG_hydrogen_stats) { 1343 info_zone_start_allocation_size_ = info->zone()->allocation_size(); 1344 timer_.Start(); 1345 } 1346 } 1347 1348 1349 CompilationPhase::~CompilationPhase() { 1350 if (FLAG_hydrogen_stats) { 1351 unsigned size = zone()->allocation_size(); 1352 size += info_->zone()->allocation_size() - info_zone_start_allocation_size_; 1353 isolate()->GetHStatistics()->SaveTiming(name_, timer_.Elapsed(), size); 1354 } 1355 } 1356 1357 1358 bool CompilationPhase::ShouldProduceTraceOutput() const { 1359 // Trace if the appropriate trace flag is set and the phase name's first 1360 // character is in the FLAG_trace_phase command line parameter. 1361 AllowHandleDereference allow_deref; 1362 bool tracing_on = info()->IsStub() 1363 ? FLAG_trace_hydrogen_stubs 1364 : (FLAG_trace_hydrogen && 1365 info()->closure()->PassesFilter(FLAG_trace_hydrogen_filter)); 1366 return (tracing_on && 1367 OS::StrChr(const_cast<char*>(FLAG_trace_phase), name_[0]) != NULL); 1368 } 1369 1370 } } // namespace v8::internal 1371
