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// Copyright 2006-2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_BOOTSTRAPPER_H_
#define V8_BOOTSTRAPPER_H_
#include "allocation.h"
namespace v8 {
namespace internal {
// A SourceCodeCache uses a FixedArray to store pairs of
// (AsciiString*, 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 BASE_EMBEDDED {
public:
explicit SourceCodeCache(Script::Type type): type_(type), cache_(NULL) { }
void Initialize(bool create_heap_objects) {
cache_ = create_heap_objects ? HEAP->empty_fixed_array() : NULL;
}
void Iterate(ObjectVisitor* v) {
v->VisitPointer(BitCast<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);
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 {
public:
static void InitializeOncePerProcess();
// 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(
Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions);
// Detach the environment from its outer global object.
void DetachGlobal(Handle<Context> env);
// Reattach an outer global object to an environment.
void ReattachGlobal(Handle<Context> env, Handle<JSGlobalProxy> global_proxy);
// Traverses the pointers for memory management.
void Iterate(ObjectVisitor* v);
// Accessor for the native scripts source code.
Handle<String> NativesSourceLookup(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();
// This will allocate a char array that is deleted when V8 is shut down.
// It should only be used for strictly finite allocations.
char* AllocateAutoDeletedArray(int bytes);
// 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_;
// This is for delete, not delete[].
List<char*>* delete_these_non_arrays_on_tear_down_;
// This is for delete[]
List<char*>* delete_these_arrays_on_tear_down_;
friend class BootstrapperActive;
friend class Isolate;
friend class NativesExternalStringResource;
explicit Bootstrapper(Isolate* isolate);
DISALLOW_COPY_AND_ASSIGN(Bootstrapper);
};
class BootstrapperActive BASE_EMBEDDED {
public:
explicit BootstrapperActive(Bootstrapper* bootstrapper)
: bootstrapper_(bootstrapper) {
++bootstrapper_->nesting_;
}
~BootstrapperActive() {
--bootstrapper_->nesting_;
}
private:
Bootstrapper* bootstrapper_;
DISALLOW_COPY_AND_ASSIGN(BootstrapperActive);
};
class NativesExternalStringResource
: public v8::String::ExternalAsciiStringResource {
public:
NativesExternalStringResource(Bootstrapper* bootstrapper,
const char* source,
size_t length);
const char* data() const {
return data_;
}
size_t length() const {
return length_;
}
private:
const char* data_;
size_t length_;
};
}} // namespace v8::internal
#endif // V8_BOOTSTRAPPER_H_
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