| // 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. |
| |
| #ifndef RUNTIME_VM_THREAD_STATE_H_ |
| #define RUNTIME_VM_THREAD_STATE_H_ |
| |
| #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 { |
| public: |
| // The currently executing thread, or NULL if not yet initialized. |
| static ThreadState* Current() { |
| #if defined(HAS_C11_THREAD_LOCAL) |
| return OSThread::CurrentVMThread(); |
| #else |
| BaseThread* thread = OSThread::GetCurrentTLS(); |
| if (thread == NULL || thread->is_os_thread()) { |
| return NULL; |
| } |
| return static_cast<ThreadState*>(thread); |
| #endif |
| } |
| |
| 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_; |
| #else |
| return 0; |
| #endif |
| } |
| |
| void set_top_handle_scope(HandleScope* handle_scope) { |
| #if defined(DEBUG) |
| top_handle_scope_ = handle_scope; |
| #endif |
| } |
| |
| private: |
| 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 |
| |
| #endif // RUNTIME_VM_THREAD_STATE_H_ |