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![Vyacheslav Egorov](/assets/img/avatar_default.png)
- Introduce a slimmed down version of thread.h, which just depends on the Zone and StackResource. - Introduce a layering check that would prevent the coupling in the future. This is the first step towards decoupling compiler from runtime. There are multiple reasons to introduce the decoupling but the main reason currently is to introduce a controlled surface through which compiler reaches into runtime to catch any places where runtime word size might influence the compiler and then enable building compiler that targets 32-bit runtime but is embedded into a 64-bit runtime. Issue https://github.com/dart-lang/sdk/issues/31709 Change-Id: Id63ebbaddca55dd097298e51c90d957a73fa476e Reviewed-on: https://dart-review.googlesource.com/c/87182 Commit-Queue: Vyacheslav Egorov <vegorov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
// Copyright (c) 2012, 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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#include "vm/allocation.h"
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#include "platform/assert.h"
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#include "vm/isolate.h"
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#include "vm/thread.h"
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#include "vm/zone.h"
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namespace dart {
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static void* Allocate(uword size, Zone* zone) {
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ASSERT(zone != NULL);
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if (size > static_cast<uword>(kIntptrMax)) {
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FATAL1("ZoneAllocated object has unexpectedly large size %" Pu "", size);
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}
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return reinterpret_cast<void*>(zone->AllocUnsafe(size));
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}
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void* ZoneAllocated::operator new(uword size) {
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return Allocate(size, Thread::Current()->zone());
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}
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void* ZoneAllocated::operator new(uword size, Zone* zone) {
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ASSERT(Thread::Current()->ZoneIsOwnedByThread(zone));
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return Allocate(size, zone);
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}
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StackResource::~StackResource() {
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if (thread_ != NULL) {
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StackResource* top = thread_->top_resource();
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ASSERT(top == this);
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thread_->set_top_resource(previous_);
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}
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#if defined(DEBUG)
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if (thread_ != NULL) {
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ASSERT(Thread::Current() == thread_);
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}
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#endif
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}
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void StackResource::Init(ThreadState* thread) {
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// We can only have longjumps and exceptions when there is a current
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// thread and isolate. If there is no current thread, we don't need to
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// protect this case.
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// TODO(23807): Eliminate this special case.
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if (thread != NULL) {
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ASSERT(Thread::Current() == thread);
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thread_ = thread;
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previous_ = thread_->top_resource();
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ASSERT((previous_ == NULL) || (previous_->thread_ == thread));
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thread_->set_top_resource(this);
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}
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}
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void StackResource::UnwindAbove(ThreadState* thread, StackResource* new_top) {
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StackResource* current_resource = thread->top_resource();
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while (current_resource != new_top) {
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current_resource->~StackResource();
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current_resource = thread->top_resource();
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}
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}
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} // namespace dart
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