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