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// Copyright 2014 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.
#ifndef V8_BOOTSTRAPPER_H_
#define V8_BOOTSTRAPPER_H_
#include "src/factory.h"
namespace v8 {
namespace internal {
// A SourceCodeCache uses a FixedArray to store pairs of
// (OneByteString*, JSFunction*), mapping names of native code files
// (runtime.js, etc.) to precompiled functions. Instead of mapping
// names to functions it might make sense to let the JS2C tool
// generate an index for each native JS file.
class SourceCodeCache final BASE_EMBEDDED {
public:
explicit SourceCodeCache(Script::Type type): type_(type), cache_(NULL) { }
void Initialize(Isolate* isolate, bool create_heap_objects) {
cache_ = create_heap_objects ? isolate->heap()->empty_fixed_array() : NULL;
}
void Iterate(ObjectVisitor* v) {
v->VisitPointer(bit_cast<Object**, FixedArray**>(&cache_));
}
bool Lookup(Vector<const char> name, Handle<SharedFunctionInfo>* handle) {
for (int i = 0; i < cache_->length(); i+=2) {
SeqOneByteString* str = SeqOneByteString::cast(cache_->get(i));
if (str->IsUtf8EqualTo(name)) {
*handle = Handle<SharedFunctionInfo>(
SharedFunctionInfo::cast(cache_->get(i + 1)));
return true;
}
}
return false;
}
void Add(Vector<const char> name, Handle<SharedFunctionInfo> shared) {
Isolate* isolate = shared->GetIsolate();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
int length = cache_->length();
Handle<FixedArray> new_array = factory->NewFixedArray(length + 2, TENURED);
cache_->CopyTo(0, *new_array, 0, cache_->length());
cache_ = *new_array;
Handle<String> str =
factory->NewStringFromAscii(name, TENURED).ToHandleChecked();
DCHECK(!str.is_null());
cache_->set(length, *str);
cache_->set(length + 1, *shared);
Script::cast(shared->script())->set_type(Smi::FromInt(type_));
}
private:
Script::Type type_;
FixedArray* cache_;
DISALLOW_COPY_AND_ASSIGN(SourceCodeCache);
};
// The Boostrapper is the public interface for creating a JavaScript global
// context.
class Bootstrapper final {
public:
static void InitializeOncePerProcess();
static void TearDownExtensions();
// Requires: Heap::SetUp has been called.
void Initialize(bool create_heap_objects);
void TearDown();
// Creates a JavaScript Global Context with initial object graph.
// The returned value is a global handle casted to V8Environment*.
Handle<Context> CreateEnvironment(
MaybeHandle<JSGlobalProxy> maybe_global_proxy,
v8::Local<v8::ObjectTemplate> global_object_template,
v8::ExtensionConfiguration* extensions);
// Detach the environment from its outer global object.
void DetachGlobal(Handle<Context> env);
// Traverses the pointers for memory management.
void Iterate(ObjectVisitor* v);
// Accessor for the native scripts source code.
template <class Source>
Handle<String> SourceLookup(int index);
// Tells whether bootstrapping is active.
bool IsActive() const { return nesting_ != 0; }
// Support for thread preemption.
static int ArchiveSpacePerThread();
char* ArchiveState(char* to);
char* RestoreState(char* from);
void FreeThreadResources();
// Used for new context creation.
bool InstallExtensions(Handle<Context> native_context,
v8::ExtensionConfiguration* extensions);
SourceCodeCache* extensions_cache() { return &extensions_cache_; }
private:
Isolate* isolate_;
typedef int NestingCounterType;
NestingCounterType nesting_;
SourceCodeCache extensions_cache_;
friend class BootstrapperActive;
friend class Isolate;
friend class NativesExternalStringResource;
explicit Bootstrapper(Isolate* isolate);
static v8::Extension* free_buffer_extension_;
static v8::Extension* gc_extension_;
static v8::Extension* externalize_string_extension_;
static v8::Extension* statistics_extension_;
static v8::Extension* trigger_failure_extension_;
DISALLOW_COPY_AND_ASSIGN(Bootstrapper);
};
class BootstrapperActive final BASE_EMBEDDED {
public:
explicit BootstrapperActive(Bootstrapper* bootstrapper)
: bootstrapper_(bootstrapper) {
++bootstrapper_->nesting_;
}
~BootstrapperActive() {
--bootstrapper_->nesting_;
}
private:
Bootstrapper* bootstrapper_;
DISALLOW_COPY_AND_ASSIGN(BootstrapperActive);
};
class NativesExternalStringResource final
: public v8::String::ExternalOneByteStringResource {
public:
NativesExternalStringResource(const char* source, size_t length)
: data_(source), length_(length) {}
const char* data() const override { return data_; }
size_t length() const override { return length_; }
private:
const char* data_;
size_t length_;
};
}} // namespace v8::internal
#endif // V8_BOOTSTRAPPER_H_
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