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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