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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/handles.h"
#include "platform/assert.h"
#include "platform/utils.h"
#include "vm/dart_api_state.h"
#include "vm/flags.h"
#include "vm/os.h"
#include "vm/raw_object.h"
#include "vm/visitor.h"
#include "vm/zone.h"
#include "vm/handles_impl.h"
namespace dart {
void VMHandles::VisitObjectPointers(ObjectPointerVisitor* visitor) {
return Handles<kVMHandleSizeInWords, kVMHandlesPerChunk,
kOffsetOfRawPtr>::VisitObjectPointers(visitor);
}
#if defined(DEBUG)
static bool IsCurrentApiNativeScope(Zone* zone) {
ApiNativeScope* scope = ApiNativeScope::Current();
return (scope != nullptr) && (scope->zone() == zone);
}
#endif // DEBUG
uword VMHandles::AllocateHandle(Zone* zone) {
DEBUG_ASSERT(!IsCurrentApiNativeScope(zone));
uword handle = Handles<kVMHandleSizeInWords, kVMHandlesPerChunk,
kOffsetOfRawPtr>::AllocateHandle(zone);
#if defined(DEBUG)
*reinterpret_cast<uword*>(handle + kOffsetOfIsZoneHandle * kWordSize) = 0;
#endif
return handle;
}
uword VMHandles::AllocateZoneHandle(Zone* zone) {
DEBUG_ASSERT(!IsCurrentApiNativeScope(zone));
uword handle = Handles<kVMHandleSizeInWords, kVMHandlesPerChunk,
kOffsetOfRawPtr>::AllocateZoneHandle(zone);
#if defined(DEBUG)
*reinterpret_cast<uword*>(handle + kOffsetOfIsZoneHandle * kWordSize) = 1;
#endif
return handle;
}
#if defined(DEBUG)
bool VMHandles::IsZoneHandle(uword handle) {
return *reinterpret_cast<uword*>(handle +
kOffsetOfIsZoneHandle * kWordSize) != 0;
}
#endif
int VMHandles::ScopedHandleCount() {
Thread* thread = Thread::Current();
ASSERT(thread->zone() != nullptr);
VMHandles* handles = thread->zone()->handles();
return handles->CountScopedHandles();
}
int VMHandles::ZoneHandleCount() {
Thread* thread = Thread::Current();
ASSERT(thread->zone() != nullptr);
VMHandles* handles = thread->zone()->handles();
return handles->CountZoneHandles();
}
void HandleScope::Initialize() {
ASSERT(thread()->MayAllocateHandles());
VMHandles* handles = thread()->zone()->handles();
ASSERT(handles != nullptr);
saved_handle_block_ = handles->scoped_blocks_;
saved_handle_slot_ = handles->scoped_blocks_->next_handle_slot();
#if defined(DEBUG)
link_ = thread()->top_handle_scope();
thread()->set_top_handle_scope(this);
#endif
}
HandleScope::HandleScope(ThreadState* thread) : StackResource(thread) {
Initialize();
}
HandleScope::~HandleScope() {
ASSERT(thread()->zone() != nullptr);
VMHandles* handles = thread()->zone()->handles();
ASSERT(handles != nullptr);
#if defined(DEBUG)
VMHandles::HandlesBlock* last = handles->scoped_blocks_;
#endif
handles->scoped_blocks_ = saved_handle_block_;
handles->scoped_blocks_->set_next_handle_slot(saved_handle_slot_);
#if defined(DEBUG)
VMHandles::HandlesBlock* block = handles->scoped_blocks_;
for (;;) {
block->ZapFreeHandles();
if (block == last) break;
block = block->next_block();
}
ASSERT(thread()->top_handle_scope() == this);
thread()->set_top_handle_scope(link_);
#endif
}
} // namespace dart