ea910460bd
Change more functions used by the Compiler class to have a uniform interface: they get passed as argument an input/output pointer to a CompilationInfo that they mutate if they succeed, and they return a flag telling whether they succeeded. Also, remove some unnecessary timers. Review URL: http://codereview.chromium.org/3561012 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5583 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
575 lines
21 KiB
C++
Executable File
575 lines
21 KiB
C++
Executable File
// Copyright 2010 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "v8.h"
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#include "compiler.h"
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#include "bootstrapper.h"
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#include "codegen-inl.h"
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#include "compilation-cache.h"
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#include "data-flow.h"
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#include "debug.h"
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#include "full-codegen.h"
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#include "liveedit.h"
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#include "oprofile-agent.h"
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#include "parser.h"
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#include "rewriter.h"
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#include "scopeinfo.h"
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#include "scopes.h"
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namespace v8 {
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namespace internal {
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CompilationInfo::CompilationInfo(Handle<Script> script)
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: flags_(0),
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function_(NULL),
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scope_(NULL),
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script_(script),
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extension_(NULL),
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pre_parse_data_(NULL) {
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}
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CompilationInfo::CompilationInfo(Handle<SharedFunctionInfo> shared_info)
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: flags_(IsLazy::encode(true)),
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function_(NULL),
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scope_(NULL),
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shared_info_(shared_info),
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script_(Handle<Script>(Script::cast(shared_info->script()))),
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extension_(NULL),
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pre_parse_data_(NULL) {
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}
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CompilationInfo::CompilationInfo(Handle<JSFunction> closure)
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: flags_(IsLazy::encode(true)),
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function_(NULL),
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scope_(NULL),
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closure_(closure),
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shared_info_(Handle<SharedFunctionInfo>(closure->shared())),
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script_(Handle<Script>(Script::cast(shared_info_->script()))),
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extension_(NULL),
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pre_parse_data_(NULL) {
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}
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// For normal operation the syntax checker is used to determine whether to
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// use the full compiler for top level code or not. However if the flag
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// --always-full-compiler is specified or debugging is active the full
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// compiler will be used for all code.
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static bool AlwaysFullCompiler() {
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#ifdef ENABLE_DEBUGGER_SUPPORT
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return FLAG_always_full_compiler || Debugger::IsDebuggerActive();
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#else
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return FLAG_always_full_compiler;
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#endif
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}
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static bool MakeCode(CompilationInfo* info) {
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// Precondition: code has been parsed. Postcondition: the code field in
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// the compilation info is set if compilation succeeded.
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ASSERT(info->function() != NULL);
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if (Rewriter::Rewrite(info) &&
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Scope::Analyze(info) &&
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Rewriter::Analyze(info)) {
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// Generate code and return it. Code generator selection is governed by
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// which backends are enabled and whether the function is considered
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// run-once code or not.
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//
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// --full-compiler enables the dedicated backend for code we expect to
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// be run once
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//
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// The normal choice of backend can be overridden with the flags
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// --always-full-compiler.
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Handle<SharedFunctionInfo> shared = info->shared_info();
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bool is_run_once = (shared.is_null())
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? info->scope()->is_global_scope()
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: (shared->is_toplevel() || shared->try_full_codegen());
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bool can_use_full =
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FLAG_full_compiler && !info->function()->contains_loops();
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if (AlwaysFullCompiler() || (is_run_once && can_use_full)) {
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return FullCodeGenerator::MakeCode(info);
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} else {
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AssignedVariablesAnalyzer ava;
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return ava.Analyze(info) && CodeGenerator::MakeCode(info);
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}
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}
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return false;
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}
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#ifdef ENABLE_DEBUGGER_SUPPORT
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bool Compiler::MakeCodeForLiveEdit(CompilationInfo* info) {
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// Precondition: code has been parsed. Postcondition: the code field in
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// the compilation info is set if compilation succeeded.
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bool succeeded = MakeCode(info);
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if (!info->shared_info().is_null()) {
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Handle<SerializedScopeInfo> scope_info =
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SerializedScopeInfo::Create(info->scope());
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info->shared_info()->set_scope_info(*scope_info);
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}
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return succeeded;
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}
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#endif
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static Handle<SharedFunctionInfo> MakeFunctionInfo(CompilationInfo* info) {
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CompilationZoneScope zone_scope(DELETE_ON_EXIT);
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PostponeInterruptsScope postpone;
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ASSERT(!i::Top::global_context().is_null());
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Handle<Script> script = info->script();
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script->set_context_data((*i::Top::global_context())->data());
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#ifdef ENABLE_DEBUGGER_SUPPORT
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if (info->is_eval() || info->is_json()) {
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Script::CompilationType compilation_type = info->is_json()
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? Script::COMPILATION_TYPE_JSON
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: Script::COMPILATION_TYPE_EVAL;
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script->set_compilation_type(Smi::FromInt(compilation_type));
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// For eval scripts add information on the function from which eval was
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// called.
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if (info->is_eval()) {
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StackTraceFrameIterator it;
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if (!it.done()) {
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script->set_eval_from_shared(
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JSFunction::cast(it.frame()->function())->shared());
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int offset = static_cast<int>(
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it.frame()->pc() - it.frame()->code()->instruction_start());
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script->set_eval_from_instructions_offset(Smi::FromInt(offset));
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}
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}
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}
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// Notify debugger
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Debugger::OnBeforeCompile(script);
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#endif
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// Only allow non-global compiles for eval.
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ASSERT(info->is_eval() || info->is_global());
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if (!Parser::Parse(info)) return Handle<SharedFunctionInfo>::null();
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// Measure how long it takes to do the compilation; only take the
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// rest of the function into account to avoid overlap with the
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// parsing statistics.
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HistogramTimer* rate = info->is_eval()
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? &Counters::compile_eval
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: &Counters::compile;
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HistogramTimerScope timer(rate);
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// Compile the code.
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FunctionLiteral* lit = info->function();
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LiveEditFunctionTracker live_edit_tracker(lit);
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if (!MakeCode(info)) {
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Top::StackOverflow();
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return Handle<SharedFunctionInfo>::null();
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}
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ASSERT(!info->code().is_null());
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if (script->name()->IsString()) {
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PROFILE(CodeCreateEvent(
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info->is_eval()
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? Logger::EVAL_TAG
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: Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script),
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*info->code(),
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String::cast(script->name())));
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OPROFILE(CreateNativeCodeRegion(String::cast(script->name()),
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info->code()->instruction_start(),
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info->code()->instruction_size()));
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} else {
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PROFILE(CodeCreateEvent(
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info->is_eval()
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? Logger::EVAL_TAG
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: Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script),
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*info->code(),
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""));
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OPROFILE(CreateNativeCodeRegion(info->is_eval() ? "Eval" : "Script",
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info->code()->instruction_start(),
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info->code()->instruction_size()));
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}
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// Allocate function.
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Handle<SharedFunctionInfo> result =
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Factory::NewSharedFunctionInfo(
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lit->name(),
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lit->materialized_literal_count(),
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info->code(),
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SerializedScopeInfo::Create(info->scope()));
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ASSERT_EQ(RelocInfo::kNoPosition, lit->function_token_position());
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Compiler::SetFunctionInfo(result, lit, true, script);
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// Hint to the runtime system used when allocating space for initial
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// property space by setting the expected number of properties for
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// the instances of the function.
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SetExpectedNofPropertiesFromEstimate(result, lit->expected_property_count());
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#ifdef ENABLE_DEBUGGER_SUPPORT
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// Notify debugger
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Debugger::OnAfterCompile(script, Debugger::NO_AFTER_COMPILE_FLAGS);
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#endif
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live_edit_tracker.RecordFunctionInfo(result, lit);
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return result;
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}
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Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source,
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Handle<Object> script_name,
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int line_offset,
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int column_offset,
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v8::Extension* extension,
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ScriptDataImpl* input_pre_data,
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Handle<Object> script_data,
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NativesFlag natives) {
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int source_length = source->length();
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Counters::total_load_size.Increment(source_length);
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Counters::total_compile_size.Increment(source_length);
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// The VM is in the COMPILER state until exiting this function.
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VMState state(COMPILER);
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// Do a lookup in the compilation cache but not for extensions.
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Handle<SharedFunctionInfo> result;
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if (extension == NULL) {
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result = CompilationCache::LookupScript(source,
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script_name,
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line_offset,
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column_offset);
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}
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if (result.is_null()) {
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// No cache entry found. Do pre-parsing, if it makes sense, and compile
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// the script.
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// Building preparse data that is only used immediately after is only a
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// saving if we might skip building the AST for lazily compiled functions.
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// I.e., preparse data isn't relevant when the lazy flag is off, and
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// for small sources, odds are that there aren't many functions
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// that would be compiled lazily anyway, so we skip the preparse step
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// in that case too.
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ScriptDataImpl* pre_data = input_pre_data;
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if (pre_data == NULL
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&& FLAG_lazy
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&& source_length >= FLAG_min_preparse_length) {
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pre_data = Parser::PartialPreParse(source, NULL, extension);
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}
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// Create a script object describing the script to be compiled.
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Handle<Script> script = Factory::NewScript(source);
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if (natives == NATIVES_CODE) {
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script->set_type(Smi::FromInt(Script::TYPE_NATIVE));
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}
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if (!script_name.is_null()) {
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script->set_name(*script_name);
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script->set_line_offset(Smi::FromInt(line_offset));
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script->set_column_offset(Smi::FromInt(column_offset));
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}
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script->set_data(script_data.is_null() ? Heap::undefined_value()
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: *script_data);
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// Compile the function and add it to the cache.
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CompilationInfo info(script);
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info.MarkAsGlobal();
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info.SetExtension(extension);
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info.SetPreParseData(pre_data);
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result = MakeFunctionInfo(&info);
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if (extension == NULL && !result.is_null()) {
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CompilationCache::PutScript(source, result);
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}
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// Get rid of the pre-parsing data (if necessary).
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if (input_pre_data == NULL && pre_data != NULL) {
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delete pre_data;
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}
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}
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if (result.is_null()) Top::ReportPendingMessages();
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return result;
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}
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Handle<SharedFunctionInfo> Compiler::CompileEval(Handle<String> source,
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Handle<Context> context,
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bool is_global,
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ValidationState validate) {
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// Note that if validation is required then no path through this function
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// is allowed to return a value without validating that the input is legal
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// json.
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bool is_json = (validate == VALIDATE_JSON);
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int source_length = source->length();
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Counters::total_eval_size.Increment(source_length);
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Counters::total_compile_size.Increment(source_length);
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// The VM is in the COMPILER state until exiting this function.
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VMState state(COMPILER);
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// Do a lookup in the compilation cache; if the entry is not there, invoke
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// the compiler and add the result to the cache. If we're evaluating json
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// we bypass the cache since we can't be sure a potential value in the
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// cache has been validated.
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Handle<SharedFunctionInfo> result;
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if (!is_json) {
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result = CompilationCache::LookupEval(source, context, is_global);
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}
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if (result.is_null()) {
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// Create a script object describing the script to be compiled.
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Handle<Script> script = Factory::NewScript(source);
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CompilationInfo info(script);
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info.MarkAsEval();
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if (is_global) info.MarkAsGlobal();
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if (is_json) info.MarkAsJson();
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info.SetCallingContext(context);
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result = MakeFunctionInfo(&info);
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if (!result.is_null() && !is_json) {
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// For json it's unlikely that we'll ever see exactly the same string
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// again so we don't use the compilation cache.
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CompilationCache::PutEval(source, context, is_global, result);
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}
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}
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return result;
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}
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bool Compiler::CompileLazy(CompilationInfo* info) {
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CompilationZoneScope zone_scope(DELETE_ON_EXIT);
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// The VM is in the COMPILER state until exiting this function.
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VMState state(COMPILER);
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PostponeInterruptsScope postpone;
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Handle<SharedFunctionInfo> shared = info->shared_info();
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int compiled_size = shared->end_position() - shared->start_position();
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Counters::total_compile_size.Increment(compiled_size);
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// Generate the AST for the lazily compiled function.
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if (Parser::Parse(info)) {
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// Measure how long it takes to do the lazy compilation; only take the
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// rest of the function into account to avoid overlap with the lazy
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// parsing statistics.
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HistogramTimerScope timer(&Counters::compile_lazy);
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// Compile the code.
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if (!MakeCode(info)) {
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Top::StackOverflow();
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} else {
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ASSERT(!info->code().is_null());
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RecordFunctionCompilation(Logger::LAZY_COMPILE_TAG,
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Handle<String>(shared->DebugName()),
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shared->start_position(),
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info);
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// Update the shared function info with the compiled code and the
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// scope info. Please note, that the order of the sharedfunction
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// initialization is important since SerializedScopeInfo::Create might
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// trigger a GC, causing the ASSERT below to be invalid if the code
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// was flushed. By setting the code object last we avoid this.
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Handle<SerializedScopeInfo> scope_info =
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SerializedScopeInfo::Create(info->scope());
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shared->set_scope_info(*scope_info);
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shared->set_code(*info->code());
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if (!info->closure().is_null()) {
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info->closure()->set_code(*info->code());
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}
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// Set the expected number of properties for instances.
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FunctionLiteral* lit = info->function();
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SetExpectedNofPropertiesFromEstimate(shared,
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lit->expected_property_count());
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// Set the optimization hints after performing lazy compilation, as
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// these are not set when the function is set up as a lazily compiled
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// function.
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shared->SetThisPropertyAssignmentsInfo(
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lit->has_only_simple_this_property_assignments(),
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*lit->this_property_assignments());
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// Check the function has compiled code.
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ASSERT(shared->is_compiled());
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shared->set_code_age(0);
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ASSERT(!info->code().is_null());
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return true;
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}
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}
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ASSERT(info->code().is_null());
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return false;
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}
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Handle<SharedFunctionInfo> Compiler::BuildFunctionInfo(FunctionLiteral* literal,
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Handle<Script> script) {
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#ifdef DEBUG
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// We should not try to compile the same function literal more than
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// once.
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literal->mark_as_compiled();
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#endif
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// Precondition: code has been parsed and scopes have been analyzed.
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CompilationInfo info(script);
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info.SetFunction(literal);
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info.SetScope(literal->scope());
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LiveEditFunctionTracker live_edit_tracker(literal);
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// Determine if the function can be lazily compiled. This is necessary to
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// allow some of our builtin JS files to be lazily compiled. These
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// builtins cannot be handled lazily by the parser, since we have to know
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// if a function uses the special natives syntax, which is something the
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// parser records.
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bool allow_lazy = literal->AllowsLazyCompilation() &&
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!LiveEditFunctionTracker::IsActive();
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Handle<SerializedScopeInfo> scope_info(SerializedScopeInfo::Empty());
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// Generate code
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if (FLAG_lazy && allow_lazy) {
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Handle<Code> code(Builtins::builtin(Builtins::LazyCompile));
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info.SetCode(code);
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} else {
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// Generate code and return it. The way that the compilation mode
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// is controlled by the command-line flags is described in
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// the static helper function MakeCode.
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//
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// The bodies of function literals have not yet been visited by
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// the AST analyzer.
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if (!Rewriter::Analyze(&info)) return Handle<SharedFunctionInfo>::null();
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bool is_run_once = literal->try_full_codegen();
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bool use_full = FLAG_full_compiler && !literal->contains_loops();
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if (AlwaysFullCompiler() || (use_full && is_run_once)) {
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if (!FullCodeGenerator::MakeCode(&info)) {
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return Handle<SharedFunctionInfo>::null();
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}
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} else {
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// We fall back to the classic V8 code generator.
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AssignedVariablesAnalyzer ava;
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if (!ava.Analyze(&info)) return Handle<SharedFunctionInfo>::null();
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if (!CodeGenerator::MakeCode(&info)) {
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return Handle<SharedFunctionInfo>::null();
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}
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}
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// Function compilation complete.
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RecordFunctionCompilation(Logger::FUNCTION_TAG,
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literal->debug_name(),
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literal->start_position(),
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&info);
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scope_info = SerializedScopeInfo::Create(info.scope());
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}
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// Create a shared function info object.
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Handle<SharedFunctionInfo> result =
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Factory::NewSharedFunctionInfo(literal->name(),
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literal->materialized_literal_count(),
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info.code(),
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scope_info);
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SetFunctionInfo(result, literal, false, script);
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// 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->num_parameters());
|
|
function_info->set_formal_parameter_count(lit->num_parameters());
|
|
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_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_try_full_codegen(lit->try_full_codegen());
|
|
function_info->set_allows_lazy_compilation(lit->AllowsLazyCompilation());
|
|
}
|
|
|
|
|
|
void Compiler::RecordFunctionCompilation(Logger::LogEventsAndTags tag,
|
|
Handle<String> name,
|
|
int start_position,
|
|
CompilationInfo* info) {
|
|
// 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 (Logger::is_logging() ||
|
|
OProfileAgent::is_enabled() ||
|
|
CpuProfiler::is_profiling()) {
|
|
Handle<Script> script = info->script();
|
|
Handle<Code> code = info->code();
|
|
if (script->name()->IsString()) {
|
|
int line_num = GetScriptLineNumber(script, start_position) + 1;
|
|
USE(line_num);
|
|
PROFILE(CodeCreateEvent(Logger::ToNativeByScript(tag, *script),
|
|
*code,
|
|
*name,
|
|
String::cast(script->name()),
|
|
line_num));
|
|
OPROFILE(CreateNativeCodeRegion(*name,
|
|
String::cast(script->name()),
|
|
line_num,
|
|
code->instruction_start(),
|
|
code->instruction_size()));
|
|
} else {
|
|
PROFILE(CodeCreateEvent(Logger::ToNativeByScript(tag, *script),
|
|
*code,
|
|
*name));
|
|
OPROFILE(CreateNativeCodeRegion(*name,
|
|
code->instruction_start(),
|
|
code->instruction_size()));
|
|
}
|
|
}
|
|
}
|
|
|
|
} } // namespace v8::internal
|