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https://github.com/dart-lang/sdk
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f496e538f4
This is the next step towards preventing compiler from directly peeking into runtime and instead interact with runtime through a well defined surface. The goal of the refactoring to locate all places where compiler accesses some runtime information and partion those accesses into two categories: - creating objects in the host runtime (e.g. allocating strings, numbers, etc) during compilation; - accessing properties of the target runtime (e.g. offsets of fields) to embed those into the generated code; This change introduces dart::compiler and dart::compiler::target namespaces. All code in the compiler will gradually be moved into dart::compiler namespace. One of the motivations for this change is to be able to prevent access to globally defined host constants like kWordSize by shadowing them in the dart::compiler namespace. The nested namespace dart::compiler::target hosts all information about target runtime that compiler could access, e.g. compiler::target::kWordSize defines word size of the target which will eventually be made different from the host kWordSize (defined by dart::kWordSize). The API for compiler to runtime interaction is placed into compiler_api.h. Note that we still permit runtime to access compiler internals directly - this is not going to be decoupled as part of this work. Issue https://github.com/dart-lang/sdk/issues/31709 Change-Id: If4396d295879391becfa6c38d4802bbff81f5b20 Reviewed-on: https://dart-review.googlesource.com/c/90242 Commit-Queue: Vyacheslav Egorov <vegorov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
120 lines
3.5 KiB
C++
120 lines
3.5 KiB
C++
// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_THREAD_STATE_H_
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#define RUNTIME_VM_THREAD_STATE_H_
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#include "include/dart_api.h"
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#include "vm/os_thread.h"
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namespace dart {
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class HandleScope;
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class LongJumpScope;
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class Zone;
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// ThreadState is a container for auxiliary thread-local state: e.g. it
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// owns a stack of Zones for allocation and a stack of StackResources
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// for stack unwinding.
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//
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// Important: this class is shared between compiler and runtime and
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// as such it should not expose any runtime internals due to layering
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// restrictions.
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class ThreadState : public BaseThread {
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public:
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// The currently executing thread, or NULL if not yet initialized.
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static ThreadState* Current() {
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#if defined(HAS_C11_THREAD_LOCAL)
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return OSThread::CurrentVMThread();
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#else
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BaseThread* thread = OSThread::GetCurrentTLS();
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if (thread == NULL || thread->is_os_thread()) {
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return NULL;
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}
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return static_cast<ThreadState*>(thread);
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#endif
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}
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explicit ThreadState(bool is_os_thread);
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virtual ~ThreadState();
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// OSThread corresponding to this thread.
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OSThread* os_thread() const { return os_thread_; }
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void set_os_thread(OSThread* os_thread) { os_thread_ = os_thread; }
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// The topmost zone used for allocation in this thread.
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Zone* zone() const { return zone_; }
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bool ZoneIsOwnedByThread(Zone* zone) const;
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void IncrementMemoryCapacity(uintptr_t value) {
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current_zone_capacity_ += value;
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if (current_zone_capacity_ > zone_high_watermark_) {
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zone_high_watermark_ = current_zone_capacity_;
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}
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}
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void DecrementMemoryCapacity(uintptr_t value) {
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ASSERT(current_zone_capacity_ >= value);
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current_zone_capacity_ -= value;
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}
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uintptr_t current_zone_capacity() const { return current_zone_capacity_; }
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uintptr_t zone_high_watermark() const { return zone_high_watermark_; }
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void ResetHighWatermark() { zone_high_watermark_ = current_zone_capacity_; }
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StackResource* top_resource() const { return top_resource_; }
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void set_top_resource(StackResource* value) { top_resource_ = value; }
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static intptr_t top_resource_offset() {
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return OFFSET_OF(ThreadState, top_resource_);
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}
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LongJumpScope* long_jump_base() const { return long_jump_base_; }
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void set_long_jump_base(LongJumpScope* value) { long_jump_base_ = value; }
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bool IsValidZoneHandle(Dart_Handle object) const;
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intptr_t CountZoneHandles() const;
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bool IsValidScopedHandle(Dart_Handle object) const;
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intptr_t CountScopedHandles() const;
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virtual bool MayAllocateHandles() = 0;
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HandleScope* top_handle_scope() const {
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#if defined(DEBUG)
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return top_handle_scope_;
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#else
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return 0;
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#endif
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}
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void set_top_handle_scope(HandleScope* handle_scope) {
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#if defined(DEBUG)
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top_handle_scope_ = handle_scope;
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#endif
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}
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private:
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void set_zone(Zone* zone) { zone_ = zone; }
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OSThread* os_thread_ = nullptr;
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Zone* zone_ = nullptr;
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uintptr_t current_zone_capacity_ = 0;
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uintptr_t zone_high_watermark_ = 0;
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StackResource* top_resource_ = nullptr;
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LongJumpScope* long_jump_base_ = nullptr;
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// This field is only used in the DEBUG builds, but we don't exclude it
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// because it would cause RELEASE and DEBUG builds to have different
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// offsets for various Thread fields that are used from generated code.
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HandleScope* top_handle_scope_ = nullptr;
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friend class ApiZone;
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friend class StackZone;
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};
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} // namespace dart
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#endif // RUNTIME_VM_THREAD_STATE_H_
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