1 // Copyright (c) 2013 Google Inc.
2 // All rights reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
6 // met:
7 //
8 // * Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // * Redistributions in binary form must reproduce the above
11 // copyright notice, this list of conditions and the following disclaimer
12 // in the documentation and/or other materials provided with the
13 // distribution.
14 // * Neither the name of Google Inc. nor the names of its
15 // contributors may be used to endorse or promote products derived from
16 // this software without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30 // stackwalker_address_list.cc: a pseudo stack walker.
31 //
32 // See stackwalker_address_list.h for documentation.
33 //
34 // Author: Chris Hamilton <chrisha@chromium.org>
35
36 #include <assert.h>
37
38 #include <vector>
39
40 #include "google_breakpad/processor/call_stack.h"
41 #include "google_breakpad/processor/memory_region.h"
42 #include "google_breakpad/processor/source_line_resolver_interface.h"
43 #include "google_breakpad/processor/stack_frame.h"
44 #include "processor/logging.h"
45 #include "processor/stackwalker_address_list.h"
46
47 namespace google_breakpad {
48
StackwalkerAddressList(const uint64_t * frames,size_t frame_count,const CodeModules * modules,StackFrameSymbolizer * frame_symbolizer)49 StackwalkerAddressList::StackwalkerAddressList(
50 const uint64_t* frames,
51 size_t frame_count,
52 const CodeModules* modules,
53 StackFrameSymbolizer* frame_symbolizer)
54 : Stackwalker(NULL, NULL, modules, frame_symbolizer),
55 frames_(frames),
56 frame_count_(frame_count) {
57 assert(frames);
58 assert(frame_symbolizer);
59 }
60
GetContextFrame()61 StackFrame* StackwalkerAddressList::GetContextFrame() {
62 if (frame_count_ == 0)
63 return NULL;
64
65 StackFrame* frame = new StackFrame();
66 frame->instruction = frames_[0];
67 frame->trust = StackFrame::FRAME_TRUST_PREWALKED;
68 return frame;
69 }
70
GetCallerFrame(const CallStack * stack,bool stack_scan_allowed)71 StackFrame* StackwalkerAddressList::GetCallerFrame(const CallStack* stack,
72 bool stack_scan_allowed) {
73 if (!stack) {
74 BPLOG(ERROR) << "Can't get caller frame without stack";
75 return NULL;
76 }
77
78 size_t frame_index = stack->frames()->size();
79
80 // There are no more frames to fetch.
81 if (frame_index >= frame_count_)
82 return NULL;
83
84 // All frames have the highest level of trust because they were
85 // explicitly provided.
86 StackFrame* frame = new StackFrame();
87 frame->instruction = frames_[frame_index];
88 frame->trust = StackFrame::FRAME_TRUST_PREWALKED;
89 return frame;
90 }
91
92 } // namespace google_breakpad
93