eecde44f82
Fixes the TSAN issue. R=mstarzinger@chromium.org NOTRY=true BUG= Review URL: https://codereview.chromium.org/923573002 Cr-Commit-Position: refs/heads/master@{#26623}
240 lines
8.5 KiB
C++
240 lines
8.5 KiB
C++
// Copyright 2012 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_COMPILATION_CACHE_H_
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#define V8_COMPILATION_CACHE_H_
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namespace v8 {
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namespace internal {
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// The compilation cache consists of several generational sub-caches which uses
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// this class as a base class. A sub-cache contains a compilation cache tables
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// for each generation of the sub-cache. Since the same source code string has
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// different compiled code for scripts and evals, we use separate sub-caches
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// for different compilation modes, to avoid retrieving the wrong result.
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class CompilationSubCache {
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public:
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CompilationSubCache(Isolate* isolate, int generations)
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: isolate_(isolate),
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generations_(generations) {
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tables_ = NewArray<Object*>(generations);
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}
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~CompilationSubCache() { DeleteArray(tables_); }
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// Index for the first generation in the cache.
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static const int kFirstGeneration = 0;
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// Get the compilation cache tables for a specific generation.
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Handle<CompilationCacheTable> GetTable(int generation);
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// Accessors for first generation.
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Handle<CompilationCacheTable> GetFirstTable() {
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return GetTable(kFirstGeneration);
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}
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void SetFirstTable(Handle<CompilationCacheTable> value) {
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DCHECK(kFirstGeneration < generations_);
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tables_[kFirstGeneration] = *value;
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}
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// Age the sub-cache by evicting the oldest generation and creating a new
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// young generation.
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void Age();
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// GC support.
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void Iterate(ObjectVisitor* v);
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void IterateFunctions(ObjectVisitor* v);
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// Clear this sub-cache evicting all its content.
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void Clear();
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// Remove given shared function info from sub-cache.
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void Remove(Handle<SharedFunctionInfo> function_info);
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// Number of generations in this sub-cache.
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inline int generations() { return generations_; }
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protected:
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Isolate* isolate() { return isolate_; }
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private:
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Isolate* isolate_;
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int generations_; // Number of generations.
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Object** tables_; // Compilation cache tables - one for each generation.
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DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationSubCache);
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};
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// Sub-cache for scripts.
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class CompilationCacheScript : public CompilationSubCache {
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public:
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CompilationCacheScript(Isolate* isolate, int generations);
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Handle<SharedFunctionInfo> Lookup(Handle<String> source, Handle<Object> name,
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int line_offset, int column_offset,
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bool is_embedder_debug_script,
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bool is_shared_cross_origin,
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Handle<Context> context,
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LanguageMode language_mode);
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void Put(Handle<String> source,
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Handle<Context> context,
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LanguageMode language_mode,
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Handle<SharedFunctionInfo> function_info);
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private:
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bool HasOrigin(Handle<SharedFunctionInfo> function_info, Handle<Object> name,
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int line_offset, int column_offset,
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bool is_embedder_debug_script, bool is_shared_cross_origin);
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DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheScript);
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};
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// Sub-cache for eval scripts. Two caches for eval are used. One for eval calls
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// in native contexts and one for eval calls in other contexts. The cache
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// considers the following pieces of information when checking for matching
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// entries:
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// 1. The source string.
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// 2. The shared function info of the calling function.
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// 3. Whether the source should be compiled as strict code or as sloppy code.
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// Note: Currently there are clients of CompileEval that always compile
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// sloppy code even if the calling function is a strict mode function.
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// More specifically these are the CompileString, DebugEvaluate and
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// DebugEvaluateGlobal runtime functions.
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// 4. The start position of the calling scope.
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class CompilationCacheEval: public CompilationSubCache {
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public:
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CompilationCacheEval(Isolate* isolate, int generations)
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: CompilationSubCache(isolate, generations) { }
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MaybeHandle<SharedFunctionInfo> Lookup(Handle<String> source,
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Handle<SharedFunctionInfo> outer_info,
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LanguageMode language_mode,
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int scope_position);
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void Put(Handle<String> source, Handle<SharedFunctionInfo> outer_info,
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Handle<SharedFunctionInfo> function_info, int scope_position);
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheEval);
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};
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// Sub-cache for regular expressions.
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class CompilationCacheRegExp: public CompilationSubCache {
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public:
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CompilationCacheRegExp(Isolate* isolate, int generations)
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: CompilationSubCache(isolate, generations) { }
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MaybeHandle<FixedArray> Lookup(Handle<String> source, JSRegExp::Flags flags);
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void Put(Handle<String> source,
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JSRegExp::Flags flags,
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Handle<FixedArray> data);
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheRegExp);
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};
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// The compilation cache keeps shared function infos for compiled
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// scripts and evals. The shared function infos are looked up using
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// the source string as the key. For regular expressions the
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// compilation data is cached.
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class CompilationCache {
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public:
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// Finds the script shared function info for a source
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// string. Returns an empty handle if the cache doesn't contain a
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// script for the given source string with the right origin.
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MaybeHandle<SharedFunctionInfo> LookupScript(
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Handle<String> source, Handle<Object> name, int line_offset,
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int column_offset, bool is_embedder_debug_script,
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bool is_shared_cross_origin, Handle<Context> context,
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LanguageMode language_mode);
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// Finds the shared function info for a source string for eval in a
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// given context. Returns an empty handle if the cache doesn't
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// contain a script for the given source string.
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MaybeHandle<SharedFunctionInfo> LookupEval(
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Handle<String> source, Handle<SharedFunctionInfo> outer_info,
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Handle<Context> context, LanguageMode language_mode, int scope_position);
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// Returns the regexp data associated with the given regexp if it
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// is in cache, otherwise an empty handle.
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MaybeHandle<FixedArray> LookupRegExp(
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Handle<String> source, JSRegExp::Flags flags);
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// Associate the (source, kind) pair to the shared function
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// info. This may overwrite an existing mapping.
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void PutScript(Handle<String> source,
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Handle<Context> context,
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LanguageMode language_mode,
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Handle<SharedFunctionInfo> function_info);
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// Associate the (source, context->closure()->shared(), kind) triple
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// with the shared function info. This may overwrite an existing mapping.
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void PutEval(Handle<String> source, Handle<SharedFunctionInfo> outer_info,
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Handle<Context> context,
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Handle<SharedFunctionInfo> function_info, int scope_position);
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// Associate the (source, flags) pair to the given regexp data.
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// This may overwrite an existing mapping.
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void PutRegExp(Handle<String> source,
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JSRegExp::Flags flags,
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Handle<FixedArray> data);
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// Clear the cache - also used to initialize the cache at startup.
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void Clear();
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// Remove given shared function info from all caches.
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void Remove(Handle<SharedFunctionInfo> function_info);
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// GC support.
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void Iterate(ObjectVisitor* v);
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void IterateFunctions(ObjectVisitor* v);
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// Notify the cache that a mark-sweep garbage collection is about to
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// take place. This is used to retire entries from the cache to
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// avoid keeping them alive too long without using them.
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void MarkCompactPrologue();
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// Enable/disable compilation cache. Used by debugger to disable compilation
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// cache during debugging to make sure new scripts are always compiled.
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void Enable();
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void Disable();
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private:
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explicit CompilationCache(Isolate* isolate);
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~CompilationCache();
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HashMap* EagerOptimizingSet();
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// The number of sub caches covering the different types to cache.
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static const int kSubCacheCount = 4;
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bool IsEnabled() { return FLAG_compilation_cache && enabled_; }
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Isolate* isolate() { return isolate_; }
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Isolate* isolate_;
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CompilationCacheScript script_;
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CompilationCacheEval eval_global_;
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CompilationCacheEval eval_contextual_;
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CompilationCacheRegExp reg_exp_;
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CompilationSubCache* subcaches_[kSubCacheCount];
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// Current enable state of the compilation cache.
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bool enabled_;
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friend class Isolate;
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DISALLOW_COPY_AND_ASSIGN(CompilationCache);
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};
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} } // namespace v8::internal
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#endif // V8_COMPILATION_CACHE_H_
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