Vyacheslav Egorov
a9ce969e53
- 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>
79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
// Copyright (c) 2013, 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_ALLOCATION_H_
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#define RUNTIME_VM_ALLOCATION_H_
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#include "platform/allocation.h"
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#include "platform/assert.h"
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#include "vm/base_isolate.h"
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#include "vm/globals.h"
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namespace dart {
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// Forward declarations.
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class ThreadState;
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// Stack resources subclass from this base class. The VM will ensure that the
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// destructors of these objects are called before the stack is unwound past the
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// objects location on the stack. Use stack resource objects if objects
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// need to be destroyed even in the case of exceptions when a Longjump is done
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// to a stack frame above the frame where these objects were allocated.
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class StackResource {
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public:
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explicit StackResource(ThreadState* thread) : thread_(NULL), previous_(NULL) {
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Init(thread);
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}
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virtual ~StackResource();
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// The thread that owns this resource.
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ThreadState* thread() const { return thread_; }
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// Destroy stack resources of thread until top exit frame.
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static void Unwind(ThreadState* thread) { UnwindAbove(thread, NULL); }
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// Destroy stack resources of thread above new_top, exclusive.
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static void UnwindAbove(ThreadState* thread, StackResource* new_top);
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private:
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void Init(ThreadState* thread);
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ThreadState* thread_;
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StackResource* previous_;
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DISALLOW_ALLOCATION();
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DISALLOW_IMPLICIT_CONSTRUCTORS(StackResource);
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};
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// Zone allocated objects cannot be individually deallocated, but have
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// to rely on the destructor of Zone which is called when the Zone
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// goes out of scope to reclaim memory.
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class ZoneAllocated {
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public:
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ZoneAllocated() {}
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// Implicitly allocate the object in the current zone.
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void* operator new(uword size);
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// Allocate the object in the given zone, which must be the current zone.
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void* operator new(uword size, Zone* zone);
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// Ideally, the delete operator should be protected instead of
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// public, but unfortunately the compiler sometimes synthesizes
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// (unused) destructors for classes derived from ZoneObject, which
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// require the operator to be visible. MSVC requires the delete
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// operator to be public.
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// Disallow explicit deallocation of nodes. Nodes can only be
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// deallocated by invoking DeleteAll() on the zone they live in.
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void operator delete(void* pointer) { UNREACHABLE(); }
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private:
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DISALLOW_COPY_AND_ASSIGN(ZoneAllocated);
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};
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} // namespace dart
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#endif // RUNTIME_VM_ALLOCATION_H_
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