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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_HANDLES_INL_H_
#define V8_HANDLES_INL_H_
#include "api.h"
#include "apiutils.h"
#include "handles.h"
#include "isolate.h"
namespace v8 {
namespace internal {
inline Isolate* GetIsolateForHandle(Object* obj) {
return Isolate::Current();
}
inline Isolate* GetIsolateForHandle(HeapObject* obj) {
return obj->GetIsolate();
}
template<typename T>
Handle<T>::Handle(T* obj) {
ASSERT(!obj->IsFailure());
location_ = HandleScope::CreateHandle(obj, GetIsolateForHandle(obj));
}
template<typename T>
Handle<T>::Handle(T* obj, Isolate* isolate) {
ASSERT(!obj->IsFailure());
location_ = HandleScope::CreateHandle(obj, isolate);
}
template <typename T>
inline T* Handle<T>::operator*() const {
ASSERT(location_ != NULL);
ASSERT(reinterpret_cast<Address>(*location_) != kHandleZapValue);
return *BitCast<T**>(location_);
}
HandleScope::HandleScope() {
Isolate* isolate = Isolate::Current();
v8::ImplementationUtilities::HandleScopeData* current =
isolate->handle_scope_data();
isolate_ = isolate;
prev_next_ = current->next;
prev_limit_ = current->limit;
current->level++;
}
HandleScope::HandleScope(Isolate* isolate) {
ASSERT(isolate == Isolate::Current());
v8::ImplementationUtilities::HandleScopeData* current =
isolate->handle_scope_data();
isolate_ = isolate;
prev_next_ = current->next;
prev_limit_ = current->limit;
current->level++;
}
HandleScope::~HandleScope() {
CloseScope();
}
void HandleScope::CloseScope() {
ASSERT(isolate_ == Isolate::Current());
v8::ImplementationUtilities::HandleScopeData* current =
isolate_->handle_scope_data();
current->next = prev_next_;
current->level--;
if (current->limit != prev_limit_) {
current->limit = prev_limit_;
DeleteExtensions(isolate_);
}
#ifdef DEBUG
ZapRange(prev_next_, prev_limit_);
#endif
}
template <typename T>
Handle<T> HandleScope::CloseAndEscape(Handle<T> handle_value) {
T* value = *handle_value;
// Throw away all handles in the current scope.
CloseScope();
v8::ImplementationUtilities::HandleScopeData* current =
isolate_->handle_scope_data();
// Allocate one handle in the parent scope.
ASSERT(current->level > 0);
Handle<T> result(CreateHandle<T>(value, isolate_));
// Reinitialize the current scope (so that it's ready
// to be used or closed again).
prev_next_ = current->next;
prev_limit_ = current->limit;
current->level++;
return result;
}
template <typename T>
T** HandleScope::CreateHandle(T* value, Isolate* isolate) {
ASSERT(isolate == Isolate::Current());
v8::ImplementationUtilities::HandleScopeData* current =
isolate->handle_scope_data();
internal::Object** cur = current->next;
if (cur == current->limit) cur = Extend();
// Update the current next field, set the value in the created
// handle, and return the result.
ASSERT(cur < current->limit);
current->next = cur + 1;
T** result = reinterpret_cast<T**>(cur);
*result = value;
return result;
}
#ifdef DEBUG
inline NoHandleAllocation::NoHandleAllocation() {
Isolate* isolate = Isolate::Current();
v8::ImplementationUtilities::HandleScopeData* current =
isolate->handle_scope_data();
active_ = !isolate->optimizing_compiler_thread()->IsOptimizerThread();
if (active_) {
// Shrink the current handle scope to make it impossible to do
// handle allocations without an explicit handle scope.
current->limit = current->next;
level_ = current->level;
current->level = 0;
}
}
inline NoHandleAllocation::~NoHandleAllocation() {
if (active_) {
// Restore state in current handle scope to re-enable handle
// allocations.
v8::ImplementationUtilities::HandleScopeData* data =
Isolate::Current()->handle_scope_data();
ASSERT_EQ(0, data->level);
data->level = level_;
}
}
#endif
} } // namespace v8::internal
#endif // V8_HANDLES_INL_H_
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