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/*
* Copyright (C) 2012 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_NTH_CALLER_VISITOR_H_
#define ART_RUNTIME_NTH_CALLER_VISITOR_H_
#include "art_method.h"
#include "base/mutex.h"
#include "stack.h"
namespace art {
class Thread;
// Walks up the stack 'n' callers, when used with Thread::WalkStack.
struct NthCallerVisitor : public StackVisitor {
NthCallerVisitor(Thread* thread, size_t n_in, bool include_runtime_and_upcalls = false)
: StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames),
n(n_in),
include_runtime_and_upcalls_(include_runtime_and_upcalls),
count(0),
caller(nullptr) {}
bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
ArtMethod* m = GetMethod();
bool do_count = false;
if (m == nullptr || m->IsRuntimeMethod()) {
// Upcall.
do_count = include_runtime_and_upcalls_;
} else {
do_count = true;
}
if (do_count) {
DCHECK(caller == nullptr);
if (count == n) {
caller = m;
return false;
}
count++;
}
return true;
}
const size_t n;
const bool include_runtime_and_upcalls_;
size_t count;
ArtMethod* caller;
};
} // namespace art
#endif // ART_RUNTIME_NTH_CALLER_VISITOR_H_
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