| // 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 |