turnidge@google.com
5f30febb45
This yields a 29% improvement on the Benchmark_UseDartApi microbenchmark. To do this, I had to split a few fields from Isolate into a BaseIsolate class. Sort of yucky. Review URL: https://chromiumcodereview.appspot.com//10008030 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@6288 260f80e4-7a28-3924-810f-c04153c831b5
117 lines
3.6 KiB
C++
117 lines
3.6 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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#ifndef VM_ALLOCATION_H_
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#define VM_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 Isolate;
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// Stack allocated objects subclass from this base class. Objects of this type
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// cannot be allocated on either the C or object heaps. Destructors for objects
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// of this type will not be run unless the stack is unwound through normal
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// program control flow.
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class ValueObject {
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public:
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ValueObject() { }
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~ValueObject() { }
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private:
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DISALLOW_ALLOCATION();
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// TODO(5411081): Add DISALLOW_COPY_AND_ASSIGN(ValueObject) once the mac
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// build issue is resolved.
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};
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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(BaseIsolate* isolate)
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: isolate_(isolate), previous_(NULL) {
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// We can only have longjumps and exceptions when there is a current
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// isolate. If there is no current isolate, we don't need to
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// protect this case.
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if (isolate) {
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previous_ = isolate->top_resource();
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isolate->set_top_resource(this);
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}
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}
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virtual ~StackResource() {
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if (isolate()) {
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StackResource* top = isolate()->top_resource();
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ASSERT(top == this);
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isolate()->set_top_resource(previous_);
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}
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#if defined(DEBUG)
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BaseIsolate::AssertCurrent(isolate());
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#endif
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}
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BaseIsolate* isolate() const { return isolate_; }
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// The delete operator should be private instead of public, but unfortunately
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// the compiler complains when compiling the destructors for subclasses.
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void operator delete(void* pointer) { UNREACHABLE(); }
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private:
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BaseIsolate* isolate_; // Current isolate for this stack resource.
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StackResource* previous_;
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void* operator new(uword size);
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DISALLOW_IMPLICIT_CONSTRUCTORS(StackResource);
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};
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// Static allocated classes only contain static members and can never
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// be instantiated in the heap or on the stack.
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class AllStatic {
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private:
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DISALLOW_ALLOCATION();
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DISALLOW_IMPLICIT_CONSTRUCTORS(AllStatic);
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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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// It would be ideal if the destructor method could be made private,
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// but the g++ compiler complains when this is subclassed.
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virtual ~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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// 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 // VM_ALLOCATION_H_
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