Vyacheslav Egorov
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>
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/globals.h"
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namespace dart {
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// Forward declarations.
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class ThreadState;
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class Zone;
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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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