107 lines
3 KiB
C++
107 lines
3 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_MANAGED_STACK_H_
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#define ART_RUNTIME_MANAGED_STACK_H_
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#include <cstring>
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#include <stdint.h>
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#include <string>
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#include "base/logging.h"
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#include "base/macros.h"
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#include "base/mutex.h"
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namespace art {
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namespace mirror {
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class Object;
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} // namespace mirror
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class ArtMethod;
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class ShadowFrame;
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template <typename T> class StackReference;
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// The managed stack is used to record fragments of managed code stacks. Managed code stacks
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// may either be shadow frames or lists of frames using fixed frame sizes. Transition records are
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// necessary for transitions between code using different frame layouts and transitions into native
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// code.
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class PACKED(4) ManagedStack {
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public:
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ManagedStack()
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: top_quick_frame_(nullptr), link_(nullptr), top_shadow_frame_(nullptr) {}
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void PushManagedStackFragment(ManagedStack* fragment) {
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// Copy this top fragment into given fragment.
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memcpy(fragment, this, sizeof(ManagedStack));
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// Clear this fragment, which has become the top.
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memset(this, 0, sizeof(ManagedStack));
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// Link our top fragment onto the given fragment.
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link_ = fragment;
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}
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void PopManagedStackFragment(const ManagedStack& fragment) {
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DCHECK(&fragment == link_);
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// Copy this given fragment back to the top.
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memcpy(this, &fragment, sizeof(ManagedStack));
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}
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ManagedStack* GetLink() const {
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return link_;
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}
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ArtMethod** GetTopQuickFrame() const {
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return top_quick_frame_;
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}
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void SetTopQuickFrame(ArtMethod** top) {
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DCHECK(top_shadow_frame_ == nullptr);
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top_quick_frame_ = top;
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}
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static size_t TopQuickFrameOffset() {
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return OFFSETOF_MEMBER(ManagedStack, top_quick_frame_);
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}
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ALWAYS_INLINE ShadowFrame* PushShadowFrame(ShadowFrame* new_top_frame);
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ALWAYS_INLINE ShadowFrame* PopShadowFrame();
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ShadowFrame* GetTopShadowFrame() const {
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return top_shadow_frame_;
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}
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void SetTopShadowFrame(ShadowFrame* top) {
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DCHECK(top_quick_frame_ == nullptr);
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top_shadow_frame_ = top;
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}
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static size_t TopShadowFrameOffset() {
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return OFFSETOF_MEMBER(ManagedStack, top_shadow_frame_);
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}
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size_t NumJniShadowFrameReferences() const REQUIRES_SHARED(Locks::mutator_lock_);
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bool ShadowFramesContain(StackReference<mirror::Object>* shadow_frame_entry) const;
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private:
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ArtMethod** top_quick_frame_;
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ManagedStack* link_;
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ShadowFrame* top_shadow_frame_;
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};
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} // namespace art
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#endif // ART_RUNTIME_MANAGED_STACK_H_
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