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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_JAVA_FRAME_ROOT_INFO_H_
#define ART_RUNTIME_JAVA_FRAME_ROOT_INFO_H_
#include <iosfwd>
#include <limits>
#include "base/locks.h"
#include "base/macros.h"
#include "gc_root.h"
namespace art {
class StackVisitor;
class JavaFrameRootInfo final : public RootInfo {
public:
static_assert(std::numeric_limits<size_t>::max() > std::numeric_limits<uint16_t>::max(),
"No extra space in vreg to store meta-data");
// Unable to determine what register number the root is from.
static constexpr size_t kUnknownVreg = -1;
// The register number for the root might be determinable but we did not attempt to find that
// information.
static constexpr size_t kImpreciseVreg = -2;
// The root is from the declaring class of the current method.
static constexpr size_t kMethodDeclaringClass = -3;
// The root is from the argument to a Proxy invoke.
static constexpr size_t kProxyReferenceArgument = -4;
// The root is from the argument to a native invoke.
static constexpr size_t kNativeReferenceArgument = -5;
// The maximum precise vreg number
static constexpr size_t kMaxVReg = std::numeric_limits<uint16_t>::max();
JavaFrameRootInfo(uint32_t thread_id, const StackVisitor* stack_visitor, size_t vreg)
: RootInfo(kRootJavaFrame, thread_id), stack_visitor_(stack_visitor), vreg_(vreg) {
}
void Describe(std::ostream& os) const override
REQUIRES_SHARED(Locks::mutator_lock_);
size_t GetVReg() const {
return vreg_;
}
const StackVisitor* GetVisitor() const {
return stack_visitor_;
}
private:
const StackVisitor* const stack_visitor_;
const size_t vreg_;
};
} // namespace art
#endif // ART_RUNTIME_JAVA_FRAME_ROOT_INFO_H_