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120 lines
6.7 KiB
C++
120 lines
6.7 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_REUSABLE_HANDLES_H_
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#define RUNTIME_VM_REUSABLE_HANDLES_H_
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#include "vm/allocation.h"
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#include "vm/handles.h"
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#include "vm/object.h"
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namespace dart {
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// Classes registered in REUSABLE_HANDLE_LIST have an thread specific reusable
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// handle. A guard class (Reusable*ClassName*HandleScope) should be used in
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// regions of the virtual machine where the thread specific reusable handle
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// of that type is used. The class asserts that we do not add code that will
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// result in recursive uses of the class's reusable handle.
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//
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// Below is an example of a reusable array handle via the
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// REUSABLE_*CLASSNAME*_HANDLESCOPE macro:
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//
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// {
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// REUSABLE_ARRAY_HANDLESCOPE(thread);
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// ....
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// ....
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// Array& funcs = reused_array_handle.Handle();
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// code that uses funcs
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// ....
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// }
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//
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#if defined(DEBUG)
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#define REUSABLE_SCOPE(name) \
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class Reusable##name##HandleScope : public ValueObject { \
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public: \
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explicit Reusable##name##HandleScope(Thread* thread) : thread_(thread) { \
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ASSERT(!thread->reusable_##name##_handle_scope_active()); \
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thread->set_reusable_##name##_handle_scope_active(true); \
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} \
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Reusable##name##HandleScope() : thread_(Thread::Current()) { \
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ASSERT(!thread_->reusable_##name##_handle_scope_active()); \
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thread_->set_reusable_##name##_handle_scope_active(true); \
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} \
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~Reusable##name##HandleScope() { \
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ASSERT(thread_->reusable_##name##_handle_scope_active()); \
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thread_->set_reusable_##name##_handle_scope_active(false); \
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Handle().raw_ = name::null(); \
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} \
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name& Handle() const { \
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ASSERT(thread_->name##_handle_ != NULL); \
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return *thread_->name##_handle_; \
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} \
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\
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private: \
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Thread* thread_; \
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DISALLOW_COPY_AND_ASSIGN(Reusable##name##HandleScope); \
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};
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#else
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#define REUSABLE_SCOPE(name) \
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class Reusable##name##HandleScope : public ValueObject { \
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public: \
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explicit Reusable##name##HandleScope(Thread* thread) \
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: handle_(thread->name##_handle_) {} \
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Reusable##name##HandleScope() \
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: handle_(Thread::Current()->name##_handle_) {} \
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~Reusable##name##HandleScope() { handle_->raw_ = name::null(); } \
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name& Handle() const { \
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ASSERT(handle_ != NULL); \
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return *handle_; \
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} \
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\
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private: \
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name* handle_; \
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DISALLOW_COPY_AND_ASSIGN(Reusable##name##HandleScope); \
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};
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#endif // defined(DEBUG)
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REUSABLE_HANDLE_LIST(REUSABLE_SCOPE)
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#undef REUSABLE_SCOPE
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#define REUSABLE_ABSTRACT_TYPE_HANDLESCOPE(thread) \
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ReusableAbstractTypeHandleScope reused_abstract_type(thread);
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#define REUSABLE_ARRAY_HANDLESCOPE(thread) \
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ReusableArrayHandleScope reused_array_handle(thread);
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#define REUSABLE_CLASS_HANDLESCOPE(thread) \
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ReusableClassHandleScope reused_class_handle(thread);
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#define REUSABLE_CODE_HANDLESCOPE(thread) \
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ReusableCodeHandleScope reused_code_handle(thread);
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#define REUSABLE_ERROR_HANDLESCOPE(thread) \
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ReusableErrorHandleScope reused_error_handle(thread);
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#define REUSABLE_EXCEPTION_HANDLERS_HANDLESCOPE(thread) \
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ReusableExceptionHandlersHandleScope reused_exception_handlers_handle(thread);
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#define REUSABLE_FIELD_HANDLESCOPE(thread) \
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ReusableFieldHandleScope reused_field_handle(thread);
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#define REUSABLE_FUNCTION_HANDLESCOPE(thread) \
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ReusableFunctionHandleScope reused_function_handle(thread);
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#define REUSABLE_GROWABLE_OBJECT_ARRAY_HANDLESCOPE(thread) \
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ReusableGrowableObjectArrayHandleScope reused_growable_object_array_handle( \
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thread)
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#define REUSABLE_INSTANCE_HANDLESCOPE(thread) \
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ReusableInstanceHandleScope reused_instance_handle(thread);
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#define REUSABLE_LIBRARY_HANDLESCOPE(thread) \
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ReusableLibraryHandleScope reused_library_handle(thread);
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#define REUSABLE_OBJECT_HANDLESCOPE(thread) \
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ReusableObjectHandleScope reused_object_handle(thread);
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#define REUSABLE_PC_DESCRIPTORS_HANDLESCOPE(thread) \
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ReusablePcDescriptorsHandleScope reused_pc_descriptors_handle(thread);
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#define REUSABLE_SMI_HANDLESCOPE(thread) \
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ReusableSmiHandleScope reused_smi_handle(thread);
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#define REUSABLE_STRING_HANDLESCOPE(thread) \
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ReusableStringHandleScope reused_string_handle(thread);
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#define REUSABLE_TYPE_ARGUMENTS_HANDLESCOPE(thread) \
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ReusableTypeArgumentsHandleScope reused_type_arguments_handle(thread);
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#define REUSABLE_TYPE_PARAMETER_HANDLESCOPE(thread) \
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ReusableTypeParameterHandleScope reused_type_parameter(thread);
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} // namespace dart
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#endif // RUNTIME_VM_REUSABLE_HANDLES_H_
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