// Copyright 2011 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "src/codegen/compilation-cache.h" #include "src/common/globals.h" #include "src/heap/factory.h" #include "src/logging/counters.h" #include "src/logging/log.h" #include "src/objects/compilation-cache-inl.h" #include "src/objects/objects-inl.h" #include "src/objects/slots.h" #include "src/objects/visitors.h" namespace v8 { namespace internal { // The number of generations for each sub cache. static const int kRegExpGenerations = 2; // Initial size of each compilation cache table allocated. static const int kInitialCacheSize = 64; CompilationCache::CompilationCache(Isolate* isolate) : isolate_(isolate), script_(isolate), eval_global_(isolate), eval_contextual_(isolate), reg_exp_(isolate, kRegExpGenerations), code_(isolate), enabled_script_and_eval_(true) { CompilationSubCache* subcaches[kSubCacheCount] = { &script_, &eval_global_, &eval_contextual_, ®_exp_, &code_}; for (int i = 0; i < kSubCacheCount; ++i) { subcaches_[i] = subcaches[i]; } } Handle<CompilationCacheTable> CompilationSubCache::GetTable(int generation) { DCHECK_LT(generation, generations()); Handle<CompilationCacheTable> result; if (tables_[generation].IsUndefined(isolate())) { result = CompilationCacheTable::New(isolate(), kInitialCacheSize); tables_[generation] = *result; } else { CompilationCacheTable table = CompilationCacheTable::cast(tables_[generation]); result = Handle<CompilationCacheTable>(table, isolate()); } return result; } // static void CompilationSubCache::AgeByGeneration(CompilationSubCache* c) { DCHECK_GT(c->generations(), 1); // Age the generations implicitly killing off the oldest. for (int i = c->generations() - 1; i > 0; i--) { c->tables_[i] = c->tables_[i - 1]; } // Set the first generation as unborn. c->tables_[0] = ReadOnlyRoots(c->isolate()).undefined_value(); } // static void CompilationSubCache::AgeCustom(CompilationSubCache* c) { DCHECK_EQ(c->generations(), 1); if (c->tables_[0].IsUndefined(c->isolate())) return; CompilationCacheTable::cast(c->tables_[0]).Age(); } void CompilationCacheScript::Age() { AgeCustom(this); } void CompilationCacheEval::Age() { AgeCustom(this); } void CompilationCacheRegExp::Age() { AgeByGeneration(this); } void CompilationCacheCode::Age() { if (FLAG_trace_turbo_nci) CompilationCacheCode::TraceAgeing(); AgeByGeneration(this); } void CompilationSubCache::Iterate(RootVisitor* v) { v->VisitRootPointers(Root::kCompilationCache, nullptr, FullObjectSlot(&tables_[0]), FullObjectSlot(&tables_[generations()])); } void CompilationSubCache::Clear() { MemsetPointer(reinterpret_cast<Address*>(tables_), ReadOnlyRoots(isolate()).undefined_value().ptr(), generations()); } void CompilationSubCache::Remove(Handle<SharedFunctionInfo> function_info) { // Probe the script generation tables. Make sure not to leak handles // into the caller's handle scope. { HandleScope scope(isolate()); for (int generation = 0; generation < generations(); generation++) { Handle<CompilationCacheTable> table = GetTable(generation); table->Remove(*function_info); } } } CompilationCacheScript::CompilationCacheScript(Isolate* isolate) : CompilationSubCache(isolate, 1) {} // We only re-use a cached function for some script source code if the // script originates from the same place. This is to avoid issues // when reporting errors, etc. bool CompilationCacheScript::HasOrigin(Handle<SharedFunctionInfo> function_info, MaybeHandle<Object> maybe_name, int line_offset, int column_offset, ScriptOriginOptions resource_options) { Handle<Script> script = Handle<Script>(Script::cast(function_info->script()), isolate()); // If the script name isn't set, the boilerplate script should have // an undefined name to have the same origin. Handle<Object> name; if (!maybe_name.ToHandle(&name)) { return script->name().IsUndefined(isolate()); } // Do the fast bailout checks first. if (line_offset != script->line_offset()) return false; if (column_offset != script->column_offset()) return false; // Check that both names are strings. If not, no match. if (!name->IsString() || !script->name().IsString()) return false; // Are the origin_options same? if (resource_options.Flags() != script->origin_options().Flags()) return false; // Compare the two name strings for equality. return String::Equals( isolate(), Handle<String>::cast(name), Handle<String>(String::cast(script->name()), isolate())); } // TODO(245): Need to allow identical code from different contexts to // be cached in the same script generation. Currently the first use // will be cached, but subsequent code from different source / line // won't. MaybeHandle<SharedFunctionInfo> CompilationCacheScript::Lookup( Handle<String> source, MaybeHandle<Object> name, int line_offset, int column_offset, ScriptOriginOptions resource_options, Handle<Context> native_context, LanguageMode language_mode) { MaybeHandle<SharedFunctionInfo> result; // Probe the script generation tables. Make sure not to leak handles // into the caller's handle scope. { HandleScope scope(isolate()); const int generation = 0; DCHECK_EQ(generations(), 1); Handle<CompilationCacheTable> table = GetTable(generation); MaybeHandle<SharedFunctionInfo> probe = CompilationCacheTable::LookupScript( table, source, native_context, language_mode); Handle<SharedFunctionInfo> function_info; if (probe.ToHandle(&function_info)) { // Break when we've found a suitable shared function info that // matches the origin. if (HasOrigin(function_info, name, line_offset, column_offset, resource_options)) { result = scope.CloseAndEscape(function_info); } } } // Once outside the manacles of the handle scope, we need to recheck // to see if we actually found a cached script. If so, we return a // handle created in the caller's handle scope. Handle<SharedFunctionInfo> function_info; if (result.ToHandle(&function_info)) { #ifdef DEBUG // Since HasOrigin can allocate, we need to protect the SharedFunctionInfo // with handles during the call. DCHECK(HasOrigin(function_info, name, line_offset, column_offset, resource_options)); #endif isolate()->counters()->compilation_cache_hits()->Increment(); LOG(isolate(), CompilationCacheEvent("hit", "script", *function_info)); } else { isolate()->counters()->compilation_cache_misses()->Increment(); } return result; } void CompilationCacheScript::Put(Handle<String> source, Handle<Context> native_context, LanguageMode language_mode, Handle<SharedFunctionInfo> function_info) { HandleScope scope(isolate()); Handle<CompilationCacheTable> table = GetFirstTable(); SetFirstTable(CompilationCacheTable::PutScript(table, source, native_context, language_mode, function_info)); } InfoCellPair CompilationCacheEval::Lookup(Handle<String> source, Handle<SharedFunctionInfo> outer_info, Handle<Context> native_context, LanguageMode language_mode, int position) { HandleScope scope(isolate()); // Make sure not to leak the table into the surrounding handle // scope. Otherwise, we risk keeping old tables around even after // having cleared the cache. InfoCellPair result; const int generation = 0; DCHECK_EQ(generations(), 1); Handle<CompilationCacheTable> table = GetTable(generation); result = CompilationCacheTable::LookupEval( table, source, outer_info, native_context, language_mode, position); if (result.has_shared()) { isolate()->counters()->compilation_cache_hits()->Increment(); } else { isolate()->counters()->compilation_cache_misses()->Increment(); } return result; } void CompilationCacheEval::Put(Handle<String> source, Handle<SharedFunctionInfo> outer_info, Handle<SharedFunctionInfo> function_info, Handle<Context> native_context, Handle<FeedbackCell> feedback_cell, int position) { HandleScope scope(isolate()); Handle<CompilationCacheTable> table = GetFirstTable(); table = CompilationCacheTable::PutEval(table, source, outer_info, function_info, native_context, feedback_cell, position); SetFirstTable(table); } MaybeHandle<FixedArray> CompilationCacheRegExp::Lookup(Handle<String> source, JSRegExp::Flags flags) { HandleScope scope(isolate()); // Make sure not to leak the table into the surrounding handle // scope. Otherwise, we risk keeping old tables around even after // having cleared the cache. Handle<Object> result = isolate()->factory()->undefined_value(); int generation; for (generation = 0; generation < generations(); generation++) { Handle<CompilationCacheTable> table = GetTable(generation); result = table->LookupRegExp(source, flags); if (result->IsFixedArray()) break; } if (result->IsFixedArray()) { Handle<FixedArray> data = Handle<FixedArray>::cast(result); if (generation != 0) { Put(source, flags, data); } isolate()->counters()->compilation_cache_hits()->Increment(); return scope.CloseAndEscape(data); } else { isolate()->counters()->compilation_cache_misses()->Increment(); return MaybeHandle<FixedArray>(); } } void CompilationCacheRegExp::Put(Handle<String> source, JSRegExp::Flags flags, Handle<FixedArray> data) { HandleScope scope(isolate()); Handle<CompilationCacheTable> table = GetFirstTable(); SetFirstTable( CompilationCacheTable::PutRegExp(isolate(), table, source, flags, data)); } MaybeHandle<Code> CompilationCacheCode::Lookup(Handle<SharedFunctionInfo> key) { // Make sure not to leak the table into the surrounding handle // scope. Otherwise, we risk keeping old tables around even after // having cleared the cache. HandleScope scope(isolate()); MaybeHandle<Code> maybe_value; int generation = 0; for (; generation < generations(); generation++) { Handle<CompilationCacheTable> table = GetTable(generation); maybe_value = table->LookupCode(key); if (!maybe_value.is_null()) break; } if (maybe_value.is_null()) { isolate()->counters()->compilation_cache_misses()->Increment(); return MaybeHandle<Code>(); } Handle<Code> value = maybe_value.ToHandleChecked(); if (generation != 0) Put(key, value); // Add to the first generation. isolate()->counters()->compilation_cache_hits()->Increment(); return scope.CloseAndEscape(value); } void CompilationCacheCode::Put(Handle<SharedFunctionInfo> key, Handle<Code> value) { HandleScope scope(isolate()); Handle<CompilationCacheTable> table = GetFirstTable(); SetFirstTable(CompilationCacheTable::PutCode(isolate(), table, key, value)); } void CompilationCacheCode::TraceAgeing() { DCHECK(FLAG_trace_turbo_nci); StdoutStream os; os << "NCI cache ageing: Removing oldest generation" << std::endl; } void CompilationCacheCode::TraceInsertion(Handle<SharedFunctionInfo> key, Handle<Code> value) { DCHECK(FLAG_trace_turbo_nci); StdoutStream os; os << "NCI cache insertion: " << Brief(*key) << ", " << Brief(*value) << std::endl; } void CompilationCacheCode::TraceHit(Handle<SharedFunctionInfo> key, Handle<Code> value) { DCHECK(FLAG_trace_turbo_nci); StdoutStream os; os << "NCI cache hit: " << Brief(*key) << ", " << Brief(*value) << std::endl; } void CompilationCache::Remove(Handle<SharedFunctionInfo> function_info) { if (!IsEnabledScriptAndEval()) return; eval_global_.Remove(function_info); eval_contextual_.Remove(function_info); script_.Remove(function_info); } MaybeHandle<SharedFunctionInfo> CompilationCache::LookupScript( Handle<String> source, MaybeHandle<Object> name, int line_offset, int column_offset, ScriptOriginOptions resource_options, Handle<Context> native_context, LanguageMode language_mode) { if (!IsEnabledScriptAndEval()) return MaybeHandle<SharedFunctionInfo>(); return script_.Lookup(source, name, line_offset, column_offset, resource_options, native_context, language_mode); } InfoCellPair CompilationCache::LookupEval(Handle<String> source, Handle<SharedFunctionInfo> outer_info, Handle<Context> context, LanguageMode language_mode, int position) { InfoCellPair result; if (!IsEnabledScriptAndEval()) return result; const char* cache_type; if (context->IsNativeContext()) { result = eval_global_.Lookup(source, outer_info, context, language_mode, position); cache_type = "eval-global"; } else { DCHECK_NE(position, kNoSourcePosition); Handle<Context> native_context(context->native_context(), isolate()); result = eval_contextual_.Lookup(source, outer_info, native_context, language_mode, position); cache_type = "eval-contextual"; } if (result.has_shared()) { LOG(isolate(), CompilationCacheEvent("hit", cache_type, result.shared())); } return result; } MaybeHandle<FixedArray> CompilationCache::LookupRegExp(Handle<String> source, JSRegExp::Flags flags) { return reg_exp_.Lookup(source, flags); } MaybeHandle<Code> CompilationCache::LookupCode(Handle<SharedFunctionInfo> sfi) { return code_.Lookup(sfi); } void CompilationCache::PutScript(Handle<String> source, Handle<Context> native_context, LanguageMode language_mode, Handle<SharedFunctionInfo> function_info) { if (!IsEnabledScriptAndEval()) return; LOG(isolate(), CompilationCacheEvent("put", "script", *function_info)); script_.Put(source, native_context, language_mode, function_info); } void CompilationCache::PutEval(Handle<String> source, Handle<SharedFunctionInfo> outer_info, Handle<Context> context, Handle<SharedFunctionInfo> function_info, Handle<FeedbackCell> feedback_cell, int position) { if (!IsEnabledScriptAndEval()) return; const char* cache_type; HandleScope scope(isolate()); if (context->IsNativeContext()) { eval_global_.Put(source, outer_info, function_info, context, feedback_cell, position); cache_type = "eval-global"; } else { DCHECK_NE(position, kNoSourcePosition); Handle<Context> native_context(context->native_context(), isolate()); eval_contextual_.Put(source, outer_info, function_info, native_context, feedback_cell, position); cache_type = "eval-contextual"; } LOG(isolate(), CompilationCacheEvent("put", cache_type, *function_info)); } void CompilationCache::PutRegExp(Handle<String> source, JSRegExp::Flags flags, Handle<FixedArray> data) { reg_exp_.Put(source, flags, data); } void CompilationCache::PutCode(Handle<SharedFunctionInfo> shared, Handle<Code> code) { code_.Put(shared, code); } void CompilationCache::Clear() { for (int i = 0; i < kSubCacheCount; i++) { subcaches_[i]->Clear(); } } void CompilationCache::Iterate(RootVisitor* v) { for (int i = 0; i < kSubCacheCount; i++) { subcaches_[i]->Iterate(v); } } void CompilationCache::MarkCompactPrologue() { for (int i = 0; i < kSubCacheCount; i++) { subcaches_[i]->Age(); } } void CompilationCache::EnableScriptAndEval() { enabled_script_and_eval_ = true; } void CompilationCache::DisableScriptAndEval() { enabled_script_and_eval_ = false; Clear(); } } // namespace internal } // namespace v8