1 /*
2  * Copyright (C) 2015 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 _DEBUGGERD_TEST_BACKTRACE_MOCK_H
18 #define _DEBUGGERD_TEST_BACKTRACE_MOCK_H
19 
20 #include <stdint.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sys/ucontext.h>
24 
25 #include <string>
26 #include <vector>
27 
28 #include <backtrace/Backtrace.h>
29 #include <backtrace/BacktraceMap.h>
30 
31 class BacktraceMapMock : public BacktraceMap {
32  public:
BacktraceMapMock()33   BacktraceMapMock() : BacktraceMap(0) {}
~BacktraceMapMock()34   virtual ~BacktraceMapMock() {}
35 
AddMap(backtrace_map_t & map)36   void AddMap(backtrace_map_t& map) {
37     maps_.push_back(map);
38   }
39 };
40 
41 
42 class BacktraceMock : public Backtrace {
43  public:
BacktraceMock(BacktraceMapMock * map)44   explicit BacktraceMock(BacktraceMapMock* map) : Backtrace(0, 0, map) {
45     if (map_ == nullptr) {
46       abort();
47     }
48   }
~BacktraceMock()49   virtual ~BacktraceMock() {}
50 
Unwind(size_t,ucontext_t *)51   virtual bool Unwind(size_t, ucontext_t*) { return false; }
ReadWord(uintptr_t,word_t *)52   virtual bool ReadWord(uintptr_t, word_t*) { return false;}
53 
GetFunctionNameRaw(uintptr_t,uintptr_t *)54   virtual std::string GetFunctionNameRaw(uintptr_t, uintptr_t*) { return ""; }
55 
Read(uintptr_t addr,uint8_t * buffer,size_t bytes)56   virtual size_t Read(uintptr_t addr, uint8_t* buffer, size_t bytes) {
57     size_t offset = 0;
58     if (last_read_addr_ > 0) {
59       offset = addr - last_read_addr_;
60     }
61     size_t bytes_available = buffer_.size() - offset;
62 
63     if (do_partial_read_) {
64       // Do a partial read.
65       if (bytes > bytes_partial_read_) {
66         bytes = bytes_partial_read_;
67       }
68       bytes_partial_read_ -= bytes;
69       // Only support a single partial read.
70       do_partial_read_ = false;
71     } else if (bytes > bytes_available) {
72       bytes = bytes_available;
73     }
74 
75     if (bytes > 0) {
76       memcpy(buffer, buffer_.data() + offset, bytes);
77     }
78 
79     last_read_addr_ = addr;
80     return bytes;
81   }
82 
SetReadData(uint8_t * buffer,size_t bytes)83   void SetReadData(uint8_t* buffer, size_t bytes) {
84     buffer_.resize(bytes);
85     memcpy(buffer_.data(), buffer, bytes);
86     bytes_partial_read_ = 0;
87     do_partial_read_ = false;
88     last_read_addr_ = 0;
89   }
90 
SetPartialReadAmount(size_t bytes)91   void SetPartialReadAmount(size_t bytes) {
92     if (bytes > buffer_.size()) {
93       abort();
94     }
95     bytes_partial_read_ = bytes;
96     do_partial_read_ = true;
97   }
98 
99  private:
100   std::vector<uint8_t> buffer_;
101   size_t bytes_partial_read_ = 0;
102   uintptr_t last_read_addr_ = 0;
103   bool do_partial_read_ = false;
104 };
105 
106 #endif //  _DEBUGGERD_TEST_BACKTRACE_MOCK_H
107