a2efd3ac7a
This new version doesn't require any specialized thread implementation, it uses the Current implementation to do its job. In addition, it runs much faster when multiple threads are trying to unwind at the same time since the global signal lock is held for only a small amount of time. Even running through the threads one at a time should be faster since it no longer requires two passes through the unwound stacks. The new code now allows multiple simultaneous unwinds of the same thread. Finally, add the ability to unwind from a ucontext_t passed in. This functionality doesn't work for remote unwinds yet. Change-Id: I4d181d7ca5ffd2acfd1686e668e6d21e36b425cb
75 lines
2.4 KiB
C++
Executable file
75 lines
2.4 KiB
C++
Executable file
/*
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* Copyright (C) 2013 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 _LIBBACKTRACE_BACKTRACE_IMPL_H
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#define _LIBBACKTRACE_BACKTRACE_IMPL_H
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#include <backtrace/Backtrace.h>
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#include <backtrace/BacktraceMap.h>
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#include <sys/types.h>
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#include <ucontext.h>
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class BacktraceImpl {
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public:
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virtual ~BacktraceImpl() { }
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virtual bool Unwind(size_t num_ignore_frames, ucontext_t* ucontext) = 0;
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// The name returned is not demangled, Backtrace::GetFunctionName()
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// takes care of demangling the name.
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virtual std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) = 0;
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void SetParent(Backtrace* backtrace) { backtrace_obj_ = backtrace; }
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inline pid_t Pid() { return backtrace_obj_->Pid(); }
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inline pid_t Tid() { return backtrace_obj_->Tid(); }
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inline const backtrace_map_t* FindMap(uintptr_t addr) {
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return backtrace_obj_->FindMap(addr);
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}
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inline std::string GetFunctionName(uintptr_t pc, uintptr_t* offset) {
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return backtrace_obj_->GetFunctionName(pc, offset);
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}
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inline BacktraceMap* GetMap() { return backtrace_obj_->GetMap(); }
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protected:
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inline std::vector<backtrace_frame_data_t>* GetFrames() { return &backtrace_obj_->frames_; }
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Backtrace* backtrace_obj_;
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};
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class BacktraceCurrent : public Backtrace {
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public:
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BacktraceCurrent(BacktraceImpl* impl, BacktraceMap* map);
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virtual ~BacktraceCurrent();
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bool ReadWord(uintptr_t ptr, word_t* out_value);
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};
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class BacktracePtrace : public Backtrace {
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public:
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BacktracePtrace(BacktraceImpl* impl, pid_t pid, pid_t tid, BacktraceMap* map);
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virtual ~BacktracePtrace();
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bool ReadWord(uintptr_t ptr, word_t* out_value);
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};
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Backtrace* CreateCurrentObj(BacktraceMap* map);
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Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, BacktraceMap* map);
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Backtrace* CreateThreadObj(pid_t tid, BacktraceMap* map);
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#endif // _LIBBACKTRACE_BACKTRACE_IMPL_H
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