b90c98fc29
BUG=v8:5402 Change-Id: If5f763e6a11d446e36719277a18b00a0cd8df8fa Reviewed-on: https://chromium-review.googlesource.com/517162 Commit-Queue: Marja Hölttä <marja@chromium.org> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> Cr-Commit-Position: refs/heads/master@{#45565}
173 lines
5.5 KiB
C++
173 lines
5.5 KiB
C++
// Copyright 2014 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_BOOTSTRAPPER_H_
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#define V8_BOOTSTRAPPER_H_
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#include "src/factory.h"
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#include "src/objects/shared-function-info.h"
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#include "src/snapshot/natives.h"
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#include "src/visitors.h"
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namespace v8 {
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namespace internal {
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// A SourceCodeCache uses a FixedArray to store pairs of
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// (OneByteString*, JSFunction*), mapping names of native code files
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// (array.js, etc.) to precompiled functions. Instead of mapping
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// names to functions it might make sense to let the JS2C tool
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// generate an index for each native JS file.
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class SourceCodeCache final BASE_EMBEDDED {
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public:
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explicit SourceCodeCache(Script::Type type): type_(type), cache_(NULL) { }
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void Initialize(Isolate* isolate, bool create_heap_objects) {
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cache_ = create_heap_objects ? isolate->heap()->empty_fixed_array() : NULL;
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}
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void Iterate(RootVisitor* v) {
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v->VisitRootPointer(Root::kExtensions,
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bit_cast<Object**, FixedArray**>(&cache_));
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}
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bool Lookup(Vector<const char> name, Handle<SharedFunctionInfo>* handle) {
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for (int i = 0; i < cache_->length(); i+=2) {
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SeqOneByteString* str = SeqOneByteString::cast(cache_->get(i));
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if (str->IsUtf8EqualTo(name)) {
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*handle = Handle<SharedFunctionInfo>(
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SharedFunctionInfo::cast(cache_->get(i + 1)));
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return true;
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}
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}
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return false;
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}
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void Add(Vector<const char> name, Handle<SharedFunctionInfo> shared) {
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Isolate* isolate = shared->GetIsolate();
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Factory* factory = isolate->factory();
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HandleScope scope(isolate);
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int length = cache_->length();
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Handle<FixedArray> new_array = factory->NewFixedArray(length + 2, TENURED);
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cache_->CopyTo(0, *new_array, 0, cache_->length());
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cache_ = *new_array;
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Handle<String> str =
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factory
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->NewStringFromOneByte(Vector<const uint8_t>::cast(name), TENURED)
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.ToHandleChecked();
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DCHECK(!str.is_null());
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cache_->set(length, *str);
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cache_->set(length + 1, *shared);
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Script::cast(shared->script())->set_type(type_);
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}
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private:
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Script::Type type_;
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FixedArray* cache_;
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DISALLOW_COPY_AND_ASSIGN(SourceCodeCache);
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};
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enum GlobalContextType { FULL_CONTEXT, DEBUG_CONTEXT };
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// The Boostrapper is the public interface for creating a JavaScript global
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// context.
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class Bootstrapper final {
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public:
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static void InitializeOncePerProcess();
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static void TearDownExtensions();
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// Requires: Heap::SetUp has been called.
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void Initialize(bool create_heap_objects);
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void TearDown();
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// Creates a JavaScript Global Context with initial object graph.
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// The returned value is a global handle casted to V8Environment*.
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Handle<Context> CreateEnvironment(
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MaybeHandle<JSGlobalProxy> maybe_global_proxy,
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v8::Local<v8::ObjectTemplate> global_object_template,
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v8::ExtensionConfiguration* extensions, size_t context_snapshot_index,
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v8::DeserializeEmbedderFieldsCallback embedder_fields_deserializer,
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GlobalContextType context_type = FULL_CONTEXT);
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Handle<JSGlobalProxy> NewRemoteContext(
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MaybeHandle<JSGlobalProxy> maybe_global_proxy,
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v8::Local<v8::ObjectTemplate> global_object_template);
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// Detach the environment from its outer global object.
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void DetachGlobal(Handle<Context> env);
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// Traverses the pointers for memory management.
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void Iterate(RootVisitor* v);
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// Accessor for the native scripts source code.
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Handle<String> GetNativeSource(NativeType type, int index);
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// Tells whether bootstrapping is active.
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bool IsActive() const { return nesting_ != 0; }
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// Support for thread preemption.
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static int ArchiveSpacePerThread();
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char* ArchiveState(char* to);
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char* RestoreState(char* from);
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void FreeThreadResources();
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// Used for new context creation.
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bool InstallExtensions(Handle<Context> native_context,
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v8::ExtensionConfiguration* extensions);
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SourceCodeCache* extensions_cache() { return &extensions_cache_; }
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static bool CompileNative(Isolate* isolate, Vector<const char> name,
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Handle<String> source, int argc,
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Handle<Object> argv[], NativesFlag natives_flag);
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static bool CompileBuiltin(Isolate* isolate, int index);
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static bool CompileExtraBuiltin(Isolate* isolate, int index);
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static bool CompileExperimentalExtraBuiltin(Isolate* isolate, int index);
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static void ExportFromRuntime(Isolate* isolate, Handle<JSObject> container);
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private:
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Isolate* isolate_;
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typedef int NestingCounterType;
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NestingCounterType nesting_;
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SourceCodeCache extensions_cache_;
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friend class BootstrapperActive;
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friend class Isolate;
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friend class NativesExternalStringResource;
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explicit Bootstrapper(Isolate* isolate);
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static v8::Extension* free_buffer_extension_;
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static v8::Extension* gc_extension_;
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static v8::Extension* externalize_string_extension_;
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static v8::Extension* statistics_extension_;
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static v8::Extension* trigger_failure_extension_;
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static v8::Extension* ignition_statistics_extension_;
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DISALLOW_COPY_AND_ASSIGN(Bootstrapper);
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};
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class BootstrapperActive final BASE_EMBEDDED {
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public:
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explicit BootstrapperActive(Bootstrapper* bootstrapper)
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: bootstrapper_(bootstrapper) {
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++bootstrapper_->nesting_;
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}
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~BootstrapperActive() {
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--bootstrapper_->nesting_;
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}
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private:
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Bootstrapper* bootstrapper_;
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DISALLOW_COPY_AND_ASSIGN(BootstrapperActive);
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_BOOTSTRAPPER_H_
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