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1 /*
2  * Copyright (C) 2013 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef _LIBBACKTRACE_BACKTRACE_IMPL_H
18 #define _LIBBACKTRACE_BACKTRACE_IMPL_H
19 
20 #include <backtrace/Backtrace.h>
21 #include <backtrace/BacktraceMap.h>
22 
23 #include <sys/types.h>
24 
25 class BacktraceImpl {
26 public:
~BacktraceImpl()27   virtual ~BacktraceImpl() { }
28 
29   virtual bool Unwind(size_t num_ignore_frames, ucontext_t* ucontext) = 0;
30 
31   // The name returned is not demangled, Backtrace::GetFunctionName()
32   // takes care of demangling the name.
33   virtual std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) = 0;
34 
SetParent(Backtrace * backtrace)35   void SetParent(Backtrace* backtrace) { backtrace_obj_ = backtrace; }
36 
Pid()37   inline pid_t Pid() { return backtrace_obj_->Pid(); }
Tid()38   inline pid_t Tid() { return backtrace_obj_->Tid(); }
39 
FindMap(uintptr_t addr)40   inline const backtrace_map_t* FindMap(uintptr_t addr) {
41     return backtrace_obj_->FindMap(addr);
42   }
GetFunctionName(uintptr_t pc,uintptr_t * offset)43   inline std::string GetFunctionName(uintptr_t pc, uintptr_t* offset) {
44     return backtrace_obj_->GetFunctionName(pc, offset);
45   }
GetMap()46   inline BacktraceMap* GetMap() { return backtrace_obj_->GetMap(); }
47 
48 protected:
GetFrames()49   inline std::vector<backtrace_frame_data_t>* GetFrames() { return &backtrace_obj_->frames_; }
50 
51   Backtrace* backtrace_obj_;
52 };
53 
54 class BacktraceCurrent : public Backtrace {
55 public:
56   BacktraceCurrent(BacktraceImpl* impl, BacktraceMap* map);
57   virtual ~BacktraceCurrent();
58 
59   bool ReadWord(uintptr_t ptr, word_t* out_value);
60 };
61 
62 class BacktracePtrace : public Backtrace {
63 public:
64   BacktracePtrace(BacktraceImpl* impl, pid_t pid, pid_t tid, BacktraceMap* map);
65   virtual ~BacktracePtrace();
66 
67   bool ReadWord(uintptr_t ptr, word_t* out_value);
68 };
69 
70 Backtrace* CreateCurrentObj(BacktraceMap* map);
71 Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, BacktraceMap* map);
72 Backtrace* CreateThreadObj(pid_t tid, BacktraceMap* map);
73 
74 #endif // _LIBBACKTRACE_BACKTRACE_IMPL_H
75