| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| |
| #include "compiler.h" |
| |
| #include "bootstrapper.h" |
| #include "codegen.h" |
| #include "compilation-cache.h" |
| #include "debug.h" |
| #include "full-codegen.h" |
| #include "gdb-jit.h" |
| #include "hydrogen.h" |
| #include "isolate-inl.h" |
| #include "lithium.h" |
| #include "liveedit.h" |
| #include "parser.h" |
| #include "rewriter.h" |
| #include "runtime-profiler.h" |
| #include "scanner-character-streams.h" |
| #include "scopeinfo.h" |
| #include "scopes.h" |
| #include "vm-state-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| CompilationInfo::CompilationInfo(Handle<Script> script) |
| : isolate_(script->GetIsolate()), |
| flags_(LanguageModeField::encode(CLASSIC_MODE)), |
| function_(NULL), |
| scope_(NULL), |
| global_scope_(NULL), |
| script_(script), |
| extension_(NULL), |
| pre_parse_data_(NULL), |
| osr_ast_id_(AstNode::kNoNumber) { |
| Initialize(BASE); |
| } |
| |
| |
| CompilationInfo::CompilationInfo(Handle<SharedFunctionInfo> shared_info) |
| : isolate_(shared_info->GetIsolate()), |
| flags_(LanguageModeField::encode(CLASSIC_MODE) | |
| IsLazy::encode(true)), |
| function_(NULL), |
| scope_(NULL), |
| global_scope_(NULL), |
| shared_info_(shared_info), |
| script_(Handle<Script>(Script::cast(shared_info->script()))), |
| extension_(NULL), |
| pre_parse_data_(NULL), |
| osr_ast_id_(AstNode::kNoNumber) { |
| Initialize(BASE); |
| } |
| |
| |
| CompilationInfo::CompilationInfo(Handle<JSFunction> closure) |
| : isolate_(closure->GetIsolate()), |
| flags_(LanguageModeField::encode(CLASSIC_MODE) | |
| IsLazy::encode(true)), |
| function_(NULL), |
| scope_(NULL), |
| global_scope_(NULL), |
| closure_(closure), |
| shared_info_(Handle<SharedFunctionInfo>(closure->shared())), |
| script_(Handle<Script>(Script::cast(shared_info_->script()))), |
| extension_(NULL), |
| pre_parse_data_(NULL), |
| osr_ast_id_(AstNode::kNoNumber) { |
| Initialize(BASE); |
| } |
| |
| |
| // Disable optimization for the rest of the compilation pipeline. |
| void CompilationInfo::DisableOptimization() { |
| bool is_optimizable_closure = |
| FLAG_optimize_closures && |
| closure_.is_null() && |
| !scope_->HasTrivialOuterContext() && |
| !scope_->outer_scope_calls_non_strict_eval() && |
| !scope_->inside_with(); |
| SetMode(is_optimizable_closure ? BASE : NONOPT); |
| } |
| |
| |
| // Primitive functions are unlikely to be picked up by the stack-walking |
| // profiler, so they trigger their own optimization when they're called |
| // for the SharedFunctionInfo::kCallsUntilPrimitiveOptimization-th time. |
| bool CompilationInfo::ShouldSelfOptimize() { |
| return FLAG_self_optimization && |
| FLAG_crankshaft && |
| !function()->flags()->Contains(kDontSelfOptimize) && |
| !function()->flags()->Contains(kDontOptimize) && |
| function()->scope()->AllowsLazyRecompilation() && |
| (shared_info().is_null() || !shared_info()->optimization_disabled()); |
| } |
| |
| |
| void CompilationInfo::AbortOptimization() { |
| Handle<Code> code(shared_info()->code()); |
| SetCode(code); |
| } |
| |
| |
| // Determine whether to use the full compiler for all code. If the flag |
| // --always-full-compiler is specified this is the case. For the virtual frame |
| // based compiler the full compiler is also used if a debugger is connected, as |
| // the code from the full compiler supports mode precise break points. For the |
| // crankshaft adaptive compiler debugging the optimized code is not possible at |
| // all. However crankshaft support recompilation of functions, so in this case |
| // the full compiler need not be be used if a debugger is attached, but only if |
| // break points has actually been set. |
| static bool is_debugging_active() { |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| Isolate* isolate = Isolate::Current(); |
| return V8::UseCrankshaft() ? |
| isolate->debug()->has_break_points() : |
| isolate->debugger()->IsDebuggerActive(); |
| #else |
| return false; |
| #endif |
| } |
| |
| |
| static bool AlwaysFullCompiler() { |
| return FLAG_always_full_compiler || is_debugging_active(); |
| } |
| |
| |
| static void FinishOptimization(Handle<JSFunction> function, int64_t start) { |
| int opt_count = function->shared()->opt_count(); |
| function->shared()->set_opt_count(opt_count + 1); |
| double ms = static_cast<double>(OS::Ticks() - start) / 1000; |
| if (FLAG_trace_opt) { |
| PrintF("[optimizing: "); |
| function->PrintName(); |
| PrintF(" / %" V8PRIxPTR, reinterpret_cast<intptr_t>(*function)); |
| PrintF(" - took %0.3f ms]\n", ms); |
| } |
| if (FLAG_trace_opt_stats) { |
| static double compilation_time = 0.0; |
| static int compiled_functions = 0; |
| static int code_size = 0; |
| |
| compilation_time += ms; |
| compiled_functions++; |
| code_size += function->shared()->SourceSize(); |
| PrintF("Compiled: %d functions with %d byte source size in %fms.\n", |
| compiled_functions, |
| code_size, |
| compilation_time); |
| } |
| } |
| |
| |
| static bool MakeCrankshaftCode(CompilationInfo* info) { |
| // Test if we can optimize this function when asked to. We can only |
| // do this after the scopes are computed. |
| if (!V8::UseCrankshaft()) { |
| info->DisableOptimization(); |
| } |
| |
| // In case we are not optimizing simply return the code from |
| // the full code generator. |
| if (!info->IsOptimizing()) { |
| return FullCodeGenerator::MakeCode(info); |
| } |
| |
| // We should never arrive here if there is not code object on the |
| // shared function object. |
| Handle<Code> code(info->shared_info()->code()); |
| ASSERT(code->kind() == Code::FUNCTION); |
| |
| // We should never arrive here if optimization has been disabled on the |
| // shared function info. |
| ASSERT(!info->shared_info()->optimization_disabled()); |
| |
| // Fall back to using the full code generator if it's not possible |
| // to use the Hydrogen-based optimizing compiler. We already have |
| // generated code for this from the shared function object. |
| if (AlwaysFullCompiler()) { |
| info->SetCode(code); |
| return true; |
| } |
| |
| // Limit the number of times we re-compile a functions with |
| // the optimizing compiler. |
| const int kMaxOptCount = |
| FLAG_deopt_every_n_times == 0 ? Compiler::kDefaultMaxOptCount : 1000; |
| if (info->shared_info()->opt_count() > kMaxOptCount) { |
| info->AbortOptimization(); |
| info->shared_info()->DisableOptimization(); |
| // True indicates the compilation pipeline is still going, not |
| // necessarily that we optimized the code. |
| return true; |
| } |
| |
| // Due to an encoding limit on LUnallocated operands in the Lithium |
| // language, we cannot optimize functions with too many formal parameters |
| // or perform on-stack replacement for function with too many |
| // stack-allocated local variables. |
| // |
| // The encoding is as a signed value, with parameters and receiver using |
| // the negative indices and locals the non-negative ones. |
| const int parameter_limit = -LUnallocated::kMinFixedIndex; |
| const int locals_limit = LUnallocated::kMaxFixedIndex; |
| Scope* scope = info->scope(); |
| if ((scope->num_parameters() + 1) > parameter_limit || |
| (info->osr_ast_id() != AstNode::kNoNumber && |
| scope->num_parameters() + 1 + scope->num_stack_slots() > locals_limit)) { |
| info->AbortOptimization(); |
| info->shared_info()->DisableOptimization(); |
| // True indicates the compilation pipeline is still going, not |
| // necessarily that we optimized the code. |
| return true; |
| } |
| |
| // Take --hydrogen-filter into account. |
| Handle<String> name = info->function()->debug_name(); |
| if (*FLAG_hydrogen_filter != '\0') { |
| Vector<const char> filter = CStrVector(FLAG_hydrogen_filter); |
| if ((filter[0] == '-' |
| && name->IsEqualTo(filter.SubVector(1, filter.length()))) |
| || (filter[0] != '-' && !name->IsEqualTo(filter))) { |
| info->SetCode(code); |
| return true; |
| } |
| } |
| |
| // Recompile the unoptimized version of the code if the current version |
| // doesn't have deoptimization support. Alternatively, we may decide to |
| // run the full code generator to get a baseline for the compile-time |
| // performance of the hydrogen-based compiler. |
| int64_t start = OS::Ticks(); |
| bool should_recompile = !info->shared_info()->has_deoptimization_support(); |
| if (should_recompile || FLAG_hydrogen_stats) { |
| HPhase phase(HPhase::kFullCodeGen); |
| CompilationInfo unoptimized(info->shared_info()); |
| // Note that we use the same AST that we will use for generating the |
| // optimized code. |
| unoptimized.SetFunction(info->function()); |
| unoptimized.SetScope(info->scope()); |
| if (should_recompile) unoptimized.EnableDeoptimizationSupport(); |
| bool succeeded = FullCodeGenerator::MakeCode(&unoptimized); |
| if (should_recompile) { |
| if (!succeeded) return false; |
| Handle<SharedFunctionInfo> shared = info->shared_info(); |
| shared->EnableDeoptimizationSupport(*unoptimized.code()); |
| // The existing unoptimized code was replaced with the new one. |
| Compiler::RecordFunctionCompilation( |
| Logger::LAZY_COMPILE_TAG, &unoptimized, shared); |
| } |
| } |
| |
| // Check that the unoptimized, shared code is ready for |
| // optimizations. When using the always_opt flag we disregard the |
| // optimizable marker in the code object and optimize anyway. This |
| // is safe as long as the unoptimized code has deoptimization |
| // support. |
| ASSERT(FLAG_always_opt || code->optimizable()); |
| ASSERT(info->shared_info()->has_deoptimization_support()); |
| |
| if (FLAG_trace_hydrogen) { |
| PrintF("-----------------------------------------------------------\n"); |
| PrintF("Compiling method %s using hydrogen\n", *name->ToCString()); |
| HTracer::Instance()->TraceCompilation(info->function()); |
| } |
| |
| Handle<Context> global_context(info->closure()->context()->global_context()); |
| TypeFeedbackOracle oracle(code, global_context, info->isolate()); |
| HGraphBuilder builder(info, &oracle); |
| HPhase phase(HPhase::kTotal); |
| HGraph* graph = builder.CreateGraph(); |
| if (info->isolate()->has_pending_exception()) { |
| info->SetCode(Handle<Code>::null()); |
| return false; |
| } |
| |
| if (graph != NULL) { |
| Handle<Code> optimized_code = graph->Compile(info); |
| if (!optimized_code.is_null()) { |
| info->SetCode(optimized_code); |
| FinishOptimization(info->closure(), start); |
| return true; |
| } |
| } |
| |
| // Keep using the shared code. |
| info->AbortOptimization(); |
| if (!builder.inline_bailout()) { |
| // Mark the shared code as unoptimizable unless it was an inlined |
| // function that bailed out. |
| info->shared_info()->DisableOptimization(); |
| } |
| // True indicates the compilation pipeline is still going, not necessarily |
| // that we optimized the code. |
| return true; |
| } |
| |
| |
| static bool GenerateCode(CompilationInfo* info) { |
| return info->IsCompilingForDebugging() || !V8::UseCrankshaft() ? |
| FullCodeGenerator::MakeCode(info) : |
| MakeCrankshaftCode(info); |
| } |
| |
| |
| static bool MakeCode(CompilationInfo* info) { |
| // Precondition: code has been parsed. Postcondition: the code field in |
| // the compilation info is set if compilation succeeded. |
| ASSERT(info->function() != NULL); |
| return Rewriter::Rewrite(info) && Scope::Analyze(info) && GenerateCode(info); |
| } |
| |
| |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| bool Compiler::MakeCodeForLiveEdit(CompilationInfo* info) { |
| // Precondition: code has been parsed. Postcondition: the code field in |
| // the compilation info is set if compilation succeeded. |
| bool succeeded = MakeCode(info); |
| if (!info->shared_info().is_null()) { |
| Handle<ScopeInfo> scope_info = ScopeInfo::Create(info->scope()); |
| info->shared_info()->set_scope_info(*scope_info); |
| } |
| return succeeded; |
| } |
| #endif |
| |
| |
| static Handle<SharedFunctionInfo> MakeFunctionInfo(CompilationInfo* info) { |
| Isolate* isolate = info->isolate(); |
| ZoneScope zone_scope(isolate, DELETE_ON_EXIT); |
| PostponeInterruptsScope postpone(isolate); |
| |
| ASSERT(!isolate->global_context().is_null()); |
| Handle<Script> script = info->script(); |
| script->set_context_data((*isolate->global_context())->data()); |
| |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| if (info->is_eval()) { |
| Script::CompilationType compilation_type = Script::COMPILATION_TYPE_EVAL; |
| script->set_compilation_type(Smi::FromInt(compilation_type)); |
| // For eval scripts add information on the function from which eval was |
| // called. |
| if (info->is_eval()) { |
| StackTraceFrameIterator it(isolate); |
| if (!it.done()) { |
| script->set_eval_from_shared( |
| JSFunction::cast(it.frame()->function())->shared()); |
| Code* code = it.frame()->LookupCode(); |
| int offset = static_cast<int>( |
| it.frame()->pc() - code->instruction_start()); |
| script->set_eval_from_instructions_offset(Smi::FromInt(offset)); |
| } |
| } |
| } |
| |
| // Notify debugger |
| isolate->debugger()->OnBeforeCompile(script); |
| #endif |
| |
| // Only allow non-global compiles for eval. |
| ASSERT(info->is_eval() || info->is_global()); |
| ParsingFlags flags = kNoParsingFlags; |
| if (info->pre_parse_data() != NULL || |
| String::cast(script->source())->length() > FLAG_min_preparse_length) { |
| flags = kAllowLazy; |
| } |
| if (!ParserApi::Parse(info, flags)) { |
| return Handle<SharedFunctionInfo>::null(); |
| } |
| |
| // Measure how long it takes to do the compilation; only take the |
| // rest of the function into account to avoid overlap with the |
| // parsing statistics. |
| HistogramTimer* rate = info->is_eval() |
| ? info->isolate()->counters()->compile_eval() |
| : info->isolate()->counters()->compile(); |
| HistogramTimerScope timer(rate); |
| |
| // Compile the code. |
| FunctionLiteral* lit = info->function(); |
| LiveEditFunctionTracker live_edit_tracker(isolate, lit); |
| if (!MakeCode(info)) { |
| if (!isolate->has_pending_exception()) isolate->StackOverflow(); |
| return Handle<SharedFunctionInfo>::null(); |
| } |
| |
| // Allocate function. |
| ASSERT(!info->code().is_null()); |
| Handle<SharedFunctionInfo> result = |
| isolate->factory()->NewSharedFunctionInfo( |
| lit->name(), |
| lit->materialized_literal_count(), |
| info->code(), |
| ScopeInfo::Create(info->scope())); |
| |
| ASSERT_EQ(RelocInfo::kNoPosition, lit->function_token_position()); |
| Compiler::SetFunctionInfo(result, lit, true, script); |
| |
| if (script->name()->IsString()) { |
| PROFILE(isolate, CodeCreateEvent( |
| info->is_eval() |
| ? Logger::EVAL_TAG |
| : Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script), |
| *info->code(), |
| *result, |
| String::cast(script->name()))); |
| GDBJIT(AddCode(Handle<String>(String::cast(script->name())), |
| script, |
| info->code(), |
| info)); |
| } else { |
| PROFILE(isolate, CodeCreateEvent( |
| info->is_eval() |
| ? Logger::EVAL_TAG |
| : Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script), |
| *info->code(), |
| *result, |
| isolate->heap()->empty_string())); |
| GDBJIT(AddCode(Handle<String>(), script, info->code(), info)); |
| } |
| |
| // Hint to the runtime system used when allocating space for initial |
| // property space by setting the expected number of properties for |
| // the instances of the function. |
| SetExpectedNofPropertiesFromEstimate(result, lit->expected_property_count()); |
| |
| script->set_compilation_state( |
| Smi::FromInt(Script::COMPILATION_STATE_COMPILED)); |
| |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| // Notify debugger |
| isolate->debugger()->OnAfterCompile( |
| script, Debugger::NO_AFTER_COMPILE_FLAGS); |
| #endif |
| |
| live_edit_tracker.RecordFunctionInfo(result, lit); |
| |
| return result; |
| } |
| |
| |
| Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source, |
| Handle<Object> script_name, |
| int line_offset, |
| int column_offset, |
| v8::Extension* extension, |
| ScriptDataImpl* pre_data, |
| Handle<Object> script_data, |
| NativesFlag natives) { |
| Isolate* isolate = source->GetIsolate(); |
| int source_length = source->length(); |
| isolate->counters()->total_load_size()->Increment(source_length); |
| isolate->counters()->total_compile_size()->Increment(source_length); |
| |
| // The VM is in the COMPILER state until exiting this function. |
| VMState state(isolate, COMPILER); |
| |
| CompilationCache* compilation_cache = isolate->compilation_cache(); |
| |
| // Do a lookup in the compilation cache but not for extensions. |
| Handle<SharedFunctionInfo> result; |
| if (extension == NULL) { |
| result = compilation_cache->LookupScript(source, |
| script_name, |
| line_offset, |
| column_offset); |
| } |
| |
| if (result.is_null()) { |
| // No cache entry found. Do pre-parsing, if it makes sense, and compile |
| // the script. |
| // Building preparse data that is only used immediately after is only a |
| // saving if we might skip building the AST for lazily compiled functions. |
| // I.e., preparse data isn't relevant when the lazy flag is off, and |
| // for small sources, odds are that there aren't many functions |
| // that would be compiled lazily anyway, so we skip the preparse step |
| // in that case too. |
| |
| // Create a script object describing the script to be compiled. |
| Handle<Script> script = FACTORY->NewScript(source); |
| if (natives == NATIVES_CODE) { |
| script->set_type(Smi::FromInt(Script::TYPE_NATIVE)); |
| } |
| if (!script_name.is_null()) { |
| script->set_name(*script_name); |
| script->set_line_offset(Smi::FromInt(line_offset)); |
| script->set_column_offset(Smi::FromInt(column_offset)); |
| } |
| |
| script->set_data(script_data.is_null() ? HEAP->undefined_value() |
| : *script_data); |
| |
| // Compile the function and add it to the cache. |
| CompilationInfo info(script); |
| info.MarkAsGlobal(); |
| info.SetExtension(extension); |
| info.SetPreParseData(pre_data); |
| if (FLAG_use_strict) { |
| info.SetLanguageMode(FLAG_harmony_scoping ? EXTENDED_MODE : STRICT_MODE); |
| } |
| result = MakeFunctionInfo(&info); |
| if (extension == NULL && !result.is_null()) { |
| compilation_cache->PutScript(source, result); |
| } |
| } else { |
| if (result->ic_age() != HEAP->global_ic_age()) { |
| result->ResetForNewContext(HEAP->global_ic_age()); |
| } |
| } |
| |
| if (result.is_null()) isolate->ReportPendingMessages(); |
| return result; |
| } |
| |
| |
| Handle<SharedFunctionInfo> Compiler::CompileEval(Handle<String> source, |
| Handle<Context> context, |
| bool is_global, |
| LanguageMode language_mode, |
| int scope_position) { |
| Isolate* isolate = source->GetIsolate(); |
| int source_length = source->length(); |
| isolate->counters()->total_eval_size()->Increment(source_length); |
| isolate->counters()->total_compile_size()->Increment(source_length); |
| |
| // The VM is in the COMPILER state until exiting this function. |
| VMState state(isolate, COMPILER); |
| |
| // Do a lookup in the compilation cache; if the entry is not there, invoke |
| // the compiler and add the result to the cache. |
| Handle<SharedFunctionInfo> result; |
| CompilationCache* compilation_cache = isolate->compilation_cache(); |
| result = compilation_cache->LookupEval(source, |
| context, |
| is_global, |
| language_mode, |
| scope_position); |
| |
| if (result.is_null()) { |
| // Create a script object describing the script to be compiled. |
| Handle<Script> script = isolate->factory()->NewScript(source); |
| CompilationInfo info(script); |
| info.MarkAsEval(); |
| if (is_global) info.MarkAsGlobal(); |
| info.SetLanguageMode(language_mode); |
| info.SetCallingContext(context); |
| result = MakeFunctionInfo(&info); |
| if (!result.is_null()) { |
| // Explicitly disable optimization for eval code. We're not yet prepared |
| // to handle eval-code in the optimizing compiler. |
| result->DisableOptimization(); |
| |
| // If caller is strict mode, the result must be in strict mode or |
| // extended mode as well, but not the other way around. Consider: |
| // eval("'use strict'; ..."); |
| ASSERT(language_mode != STRICT_MODE || !result->is_classic_mode()); |
| // If caller is in extended mode, the result must also be in |
| // extended mode. |
| ASSERT(language_mode != EXTENDED_MODE || |
| result->is_extended_mode()); |
| compilation_cache->PutEval( |
| source, context, is_global, result, scope_position); |
| } |
| } else { |
| if (result->ic_age() != HEAP->global_ic_age()) { |
| result->ResetForNewContext(HEAP->global_ic_age()); |
| } |
| } |
| |
| return result; |
| } |
| |
| |
| bool Compiler::CompileLazy(CompilationInfo* info) { |
| Isolate* isolate = info->isolate(); |
| |
| ZoneScope zone_scope(isolate, DELETE_ON_EXIT); |
| |
| // The VM is in the COMPILER state until exiting this function. |
| VMState state(isolate, COMPILER); |
| |
| PostponeInterruptsScope postpone(isolate); |
| |
| Handle<SharedFunctionInfo> shared = info->shared_info(); |
| int compiled_size = shared->end_position() - shared->start_position(); |
| isolate->counters()->total_compile_size()->Increment(compiled_size); |
| |
| // Generate the AST for the lazily compiled function. |
| if (ParserApi::Parse(info, kNoParsingFlags)) { |
| // Measure how long it takes to do the lazy compilation; only take the |
| // rest of the function into account to avoid overlap with the lazy |
| // parsing statistics. |
| HistogramTimerScope timer(isolate->counters()->compile_lazy()); |
| |
| // After parsing we know the function's language mode. Remember it. |
| LanguageMode language_mode = info->function()->language_mode(); |
| info->SetLanguageMode(language_mode); |
| shared->set_language_mode(language_mode); |
| |
| // Compile the code. |
| if (!MakeCode(info)) { |
| if (!isolate->has_pending_exception()) { |
| isolate->StackOverflow(); |
| } |
| } else { |
| ASSERT(!info->code().is_null()); |
| Handle<Code> code = info->code(); |
| // Set optimizable to false if this is disallowed by the shared |
| // function info, e.g., we might have flushed the code and must |
| // reset this bit when lazy compiling the code again. |
| if (shared->optimization_disabled()) code->set_optimizable(false); |
| |
| Handle<JSFunction> function = info->closure(); |
| RecordFunctionCompilation(Logger::LAZY_COMPILE_TAG, info, shared); |
| |
| if (info->IsOptimizing()) { |
| ASSERT(shared->scope_info() != ScopeInfo::Empty()); |
| function->ReplaceCode(*code); |
| } else { |
| // Update the shared function info with the compiled code and the |
| // scope info. Please note, that the order of the shared function |
| // info initialization is important since set_scope_info might |
| // trigger a GC, causing the ASSERT below to be invalid if the code |
| // was flushed. By setting the code object last we avoid this. |
| Handle<ScopeInfo> scope_info = ScopeInfo::Create(info->scope()); |
| shared->set_scope_info(*scope_info); |
| shared->set_code(*code); |
| if (!function.is_null()) { |
| function->ReplaceCode(*code); |
| ASSERT(!function->IsOptimized()); |
| } |
| |
| // Set the expected number of properties for instances. |
| FunctionLiteral* lit = info->function(); |
| int expected = lit->expected_property_count(); |
| SetExpectedNofPropertiesFromEstimate(shared, expected); |
| |
| // Set the optimization hints after performing lazy compilation, as |
| // these are not set when the function is set up as a lazily |
| // compiled function. |
| shared->SetThisPropertyAssignmentsInfo( |
| lit->has_only_simple_this_property_assignments(), |
| *lit->this_property_assignments()); |
| |
| // Check the function has compiled code. |
| ASSERT(shared->is_compiled()); |
| shared->set_code_age(0); |
| shared->set_dont_optimize(lit->flags()->Contains(kDontOptimize)); |
| shared->set_dont_inline(lit->flags()->Contains(kDontInline)); |
| shared->set_ast_node_count(lit->ast_node_count()); |
| |
| if (V8::UseCrankshaft()&& |
| !function.is_null() && |
| !shared->optimization_disabled()) { |
| // If we're asked to always optimize, we compile the optimized |
| // version of the function right away - unless the debugger is |
| // active as it makes no sense to compile optimized code then. |
| if (FLAG_always_opt && |
| !Isolate::Current()->DebuggerHasBreakPoints()) { |
| CompilationInfo optimized(function); |
| optimized.SetOptimizing(AstNode::kNoNumber); |
| return CompileLazy(&optimized); |
| } |
| } |
| } |
| |
| return true; |
| } |
| } |
| |
| ASSERT(info->code().is_null()); |
| return false; |
| } |
| |
| |
| Handle<SharedFunctionInfo> Compiler::BuildFunctionInfo(FunctionLiteral* literal, |
| Handle<Script> script) { |
| // Precondition: code has been parsed and scopes have been analyzed. |
| CompilationInfo info(script); |
| info.SetFunction(literal); |
| info.SetScope(literal->scope()); |
| info.SetLanguageMode(literal->scope()->language_mode()); |
| |
| LiveEditFunctionTracker live_edit_tracker(info.isolate(), literal); |
| // Determine if the function can be lazily compiled. This is necessary to |
| // allow some of our builtin JS files to be lazily compiled. These |
| // builtins cannot be handled lazily by the parser, since we have to know |
| // if a function uses the special natives syntax, which is something the |
| // parser records. |
| bool allow_lazy = literal->AllowsLazyCompilation() && |
| !LiveEditFunctionTracker::IsActive(info.isolate()); |
| |
| Handle<ScopeInfo> scope_info(ScopeInfo::Empty()); |
| |
| // Generate code |
| if (FLAG_lazy && allow_lazy) { |
| Handle<Code> code = info.isolate()->builtins()->LazyCompile(); |
| info.SetCode(code); |
| } else if ((V8::UseCrankshaft() && MakeCrankshaftCode(&info)) || |
| (!V8::UseCrankshaft() && FullCodeGenerator::MakeCode(&info))) { |
| ASSERT(!info.code().is_null()); |
| scope_info = ScopeInfo::Create(info.scope()); |
| } else { |
| return Handle<SharedFunctionInfo>::null(); |
| } |
| |
| // Create a shared function info object. |
| Handle<SharedFunctionInfo> result = |
| FACTORY->NewSharedFunctionInfo(literal->name(), |
| literal->materialized_literal_count(), |
| info.code(), |
| scope_info); |
| SetFunctionInfo(result, literal, false, script); |
| RecordFunctionCompilation(Logger::FUNCTION_TAG, &info, result); |
| result->set_allows_lazy_compilation(allow_lazy); |
| |
| // Set the expected number of properties for instances and return |
| // the resulting function. |
| SetExpectedNofPropertiesFromEstimate(result, |
| literal->expected_property_count()); |
| live_edit_tracker.RecordFunctionInfo(result, literal); |
| return result; |
| } |
| |
| |
| // Sets the function info on a function. |
| // The start_position points to the first '(' character after the function name |
| // in the full script source. When counting characters in the script source the |
| // the first character is number 0 (not 1). |
| void Compiler::SetFunctionInfo(Handle<SharedFunctionInfo> function_info, |
| FunctionLiteral* lit, |
| bool is_toplevel, |
| Handle<Script> script) { |
| function_info->set_length(lit->parameter_count()); |
| function_info->set_formal_parameter_count(lit->parameter_count()); |
| function_info->set_script(*script); |
| function_info->set_function_token_position(lit->function_token_position()); |
| function_info->set_start_position(lit->start_position()); |
| function_info->set_end_position(lit->end_position()); |
| function_info->set_is_expression(lit->is_expression()); |
| function_info->set_is_anonymous(lit->is_anonymous()); |
| function_info->set_is_toplevel(is_toplevel); |
| function_info->set_inferred_name(*lit->inferred_name()); |
| function_info->SetThisPropertyAssignmentsInfo( |
| lit->has_only_simple_this_property_assignments(), |
| *lit->this_property_assignments()); |
| function_info->set_allows_lazy_compilation(lit->AllowsLazyCompilation()); |
| function_info->set_language_mode(lit->language_mode()); |
| function_info->set_uses_arguments(lit->scope()->arguments() != NULL); |
| function_info->set_has_duplicate_parameters(lit->has_duplicate_parameters()); |
| function_info->set_ast_node_count(lit->ast_node_count()); |
| function_info->set_is_function(lit->is_function()); |
| function_info->set_dont_optimize(lit->flags()->Contains(kDontOptimize)); |
| function_info->set_dont_inline(lit->flags()->Contains(kDontInline)); |
| } |
| |
| |
| void Compiler::RecordFunctionCompilation(Logger::LogEventsAndTags tag, |
| CompilationInfo* info, |
| Handle<SharedFunctionInfo> shared) { |
| // SharedFunctionInfo is passed separately, because if CompilationInfo |
| // was created using Script object, it will not have it. |
| |
| // Log the code generation. If source information is available include |
| // script name and line number. Check explicitly whether logging is |
| // enabled as finding the line number is not free. |
| if (info->isolate()->logger()->is_logging() || |
| CpuProfiler::is_profiling(info->isolate())) { |
| Handle<Script> script = info->script(); |
| Handle<Code> code = info->code(); |
| if (*code == info->isolate()->builtins()->builtin(Builtins::kLazyCompile)) |
| return; |
| if (script->name()->IsString()) { |
| int line_num = GetScriptLineNumber(script, shared->start_position()) + 1; |
| USE(line_num); |
| PROFILE(info->isolate(), |
| CodeCreateEvent(Logger::ToNativeByScript(tag, *script), |
| *code, |
| *shared, |
| String::cast(script->name()), |
| line_num)); |
| } else { |
| PROFILE(info->isolate(), |
| CodeCreateEvent(Logger::ToNativeByScript(tag, *script), |
| *code, |
| *shared, |
| shared->DebugName())); |
| } |
| } |
| |
| GDBJIT(AddCode(Handle<String>(shared->DebugName()), |
| Handle<Script>(info->script()), |
| Handle<Code>(info->code()), |
| info)); |
| } |
| |
| } } // namespace v8::internal |
