1 // Copyright 2013 Google LLC
2 //
3 // Redistribution and use in source and binary forms, with or without
4 // modification, are permitted provided that the following conditions are
5 // met:
6 //
7 // * Redistributions of source code must retain the above copyright
8 // notice, this list of conditions and the following disclaimer.
9 // * Redistributions in binary form must reproduce the above
10 // copyright notice, this list of conditions and the following disclaimer
11 // in the documentation and/or other materials provided with the
12 // distribution.
13 // * Neither the name of Google LLC nor the names of its
14 // contributors may be used to endorse or promote products derived from
15 // this software without specific prior written permission.
16 //
17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29 // stackwalker_address_list.cc: a pseudo stack walker.
30 //
31 // See stackwalker_address_list.h for documentation.
32 //
33 // Author: Chris Hamilton <[email protected]>
34
35 #ifdef HAVE_CONFIG_H
36 #include <config.h> // Must come first
37 #endif
38
39 #include <assert.h>
40
41 #include <vector>
42
43 #include "google_breakpad/processor/call_stack.h"
44 #include "google_breakpad/processor/memory_region.h"
45 #include "google_breakpad/processor/source_line_resolver_interface.h"
46 #include "google_breakpad/processor/stack_frame.h"
47 #include "processor/logging.h"
48 #include "processor/stackwalker_address_list.h"
49
50 namespace google_breakpad {
51
StackwalkerAddressList(const uint64_t * frames,size_t frame_count,const CodeModules * modules,StackFrameSymbolizer * frame_symbolizer)52 StackwalkerAddressList::StackwalkerAddressList(
53 const uint64_t* frames,
54 size_t frame_count,
55 const CodeModules* modules,
56 StackFrameSymbolizer* frame_symbolizer)
57 : Stackwalker(NULL, NULL, modules, frame_symbolizer),
58 frames_(frames),
59 frame_count_(frame_count) {
60 assert(frames);
61 assert(frame_symbolizer);
62 }
63
GetContextFrame()64 StackFrame* StackwalkerAddressList::GetContextFrame() {
65 if (frame_count_ == 0)
66 return NULL;
67
68 StackFrame* frame = new StackFrame();
69 frame->instruction = frames_[0];
70 frame->trust = StackFrame::FRAME_TRUST_PREWALKED;
71 return frame;
72 }
73
GetCallerFrame(const CallStack * stack,bool stack_scan_allowed)74 StackFrame* StackwalkerAddressList::GetCallerFrame(const CallStack* stack,
75 bool stack_scan_allowed) {
76 if (!stack) {
77 BPLOG(ERROR) << "Can't get caller frame without stack";
78 return NULL;
79 }
80
81 size_t frame_index = stack->frames()->size();
82
83 // There are no more frames to fetch.
84 if (frame_index >= frame_count_)
85 return NULL;
86
87 // All frames have the highest level of trust because they were
88 // explicitly provided.
89 StackFrame* frame = new StackFrame();
90 frame->instruction = frames_[frame_index];
91 frame->trust = StackFrame::FRAME_TRUST_PREWALKED;
92 return frame;
93 }
94
95 } // namespace google_breakpad
96