blob: 58e57aae94a6dcb8f2d4235e89de6949ad6e5c76 [file] [log] [blame]
// Copyright (c) 2019, 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 "include/dart_api.h"
#include "vm/os_thread.h"
namespace dart {
class HandleScope;
class LongJumpScope;
class Zone;
// ThreadState is a container for auxiliary thread-local state: e.g. it
// owns a stack of Zones for allocation and a stack of StackResources
// for stack unwinding.
// Important: this class is shared between compiler and runtime and
// as such it should not expose any runtime internals due to layering
// restrictions.
class ThreadState : public BaseThread {
// The currently executing thread, or NULL if not yet initialized.
static ThreadState* Current() {
#if defined(HAS_C11_THREAD_LOCAL)
return OSThread::CurrentVMThread();
BaseThread* thread = OSThread::GetCurrentTLS();
if (thread == NULL || thread->is_os_thread()) {
return NULL;
return static_cast<ThreadState*>(thread);
explicit ThreadState(bool is_os_thread);
virtual ~ThreadState();
// OSThread corresponding to this thread.
OSThread* os_thread() const { return os_thread_; }
void set_os_thread(OSThread* os_thread) { os_thread_ = os_thread; }
// The topmost zone used for allocation in this thread.
Zone* zone() const { return zone_; }
bool ZoneIsOwnedByThread(Zone* zone) const;
void IncrementMemoryCapacity(uintptr_t value) {
current_zone_capacity_ += value;
void DecrementMemoryCapacity(uintptr_t value) {
ASSERT(current_zone_capacity_ >= value);
current_zone_capacity_ -= value;
uintptr_t current_zone_capacity() const { return current_zone_capacity_; }
StackResource* top_resource() const { return top_resource_; }
void set_top_resource(StackResource* value) { top_resource_ = value; }
static intptr_t top_resource_offset() {
return OFFSET_OF(ThreadState, top_resource_);
LongJumpScope* long_jump_base() const { return long_jump_base_; }
void set_long_jump_base(LongJumpScope* value) { long_jump_base_ = value; }
bool IsValidZoneHandle(Dart_Handle object) const;
intptr_t CountZoneHandles() const;
bool IsValidScopedHandle(Dart_Handle object) const;
intptr_t CountScopedHandles() const;
virtual bool MayAllocateHandles() = 0;
HandleScope* top_handle_scope() const {
#if defined(DEBUG)
return top_handle_scope_;
return 0;
void set_top_handle_scope(HandleScope* handle_scope) {
#if defined(DEBUG)
top_handle_scope_ = handle_scope;
void set_zone(Zone* zone) { zone_ = zone; }
OSThread* os_thread_ = nullptr;
Zone* zone_ = nullptr;
uintptr_t current_zone_capacity_ = 0;
StackResource* top_resource_ = nullptr;
LongJumpScope* long_jump_base_ = nullptr;
// This field is only used in the DEBUG builds, but we don't exclude it
// because it would cause RELEASE and DEBUG builds to have different
// offsets for various Thread fields that are used from generated code.
HandleScope* top_handle_scope_ = nullptr;
friend class ApiZone;
friend class StackZone;
} // namespace dart