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
47namespace google_breakpad {
48
49StackwalkerAddressList::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
61StackFrame* 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
71StackFrame* 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