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31
32// stackwalker_x86.h: x86-specific stackwalker.
33//
34// Provides stack frames given x86 register context and a memory region
35// corresponding to an x86 stack.
36//
37// Author: Mark Mentovai
38
39
40#ifndef PROCESSOR_STACKWALKER_X86_H__
41#define PROCESSOR_STACKWALKER_X86_H__
42
43#include <vector>
44
45#include "google_breakpad/common/breakpad_types.h"
46#include "google_breakpad/common/minidump_format.h"
47#include "google_breakpad/processor/stackwalker.h"
48#include "google_breakpad/processor/stack_frame_cpu.h"
49#include "processor/cfi_frame_info.h"
50
51namespace google_breakpad {
52
53class CodeModules;
54
55
56class StackwalkerX86 : public Stackwalker {
57 public:
58 // context is an x86 context object that gives access to x86-specific
59 // register state corresponding to the innermost called frame to be
60 // included in the stack. The other arguments are passed directly through
61 // to the base Stackwalker constructor.
62 StackwalkerX86(const SystemInfo* system_info,
63 const MDRawContextX86* context,
64 MemoryRegion* memory,
65 const CodeModules* modules,
66 StackFrameSymbolizer* frame_symbolizer);
67
68 private:
69 // A STACK CFI-driven frame walker for the X86.
70 typedef SimpleCFIWalker<uint32_t, MDRawContextX86> CFIWalker;
71
72 // Implementation of Stackwalker, using x86 context (%ebp, %esp, %eip) and
73 // stack conventions (saved %ebp at [%ebp], saved %eip at 4[%ebp], or
74 // alternate conventions as guided by any WindowsFrameInfo available for the
75 // code in question.).
76 virtual StackFrame* GetContextFrame();
77 virtual StackFrame* GetCallerFrame(const CallStack* stack,
78 bool stack_scan_allowed);
79
80 // Use windows_frame_info (derived from STACK WIN and FUNC records)
81 // to construct the frame that called frames.back(). The caller
82 // takes ownership of the returned frame. Return NULL on failure.
83 StackFrameX86* GetCallerByWindowsFrameInfo(
84 const vector<StackFrame*>& frames,
85 WindowsFrameInfo* windows_frame_info,
86 bool stack_scan_allowed);
87
88 // Use cfi_frame_info (derived from STACK CFI records) to construct
89 // the frame that called frames.back(). The caller takes ownership
90 // of the returned frame. Return NULL on failure.
91 StackFrameX86* GetCallerByCFIFrameInfo(const vector<StackFrame*>& frames,
92 CFIFrameInfo* cfi_frame_info);
93
94 // Assuming a traditional frame layout --- where the caller's %ebp
95 // has been pushed just after the return address and the callee's
96 // %ebp points to the saved %ebp --- construct the frame that called
97 // frames.back(). The caller takes ownership of the returned frame.
98 // Return NULL on failure.
99 StackFrameX86* GetCallerByEBPAtBase(const vector<StackFrame*>& frames,
100 bool stack_scan_allowed);
101
102 // Stores the CPU context corresponding to the innermost stack frame to
103 // be returned by GetContextFrame.
104 const MDRawContextX86* context_;
105
106 // Our register map, for cfi_walker_.
107 static const CFIWalker::RegisterSet cfi_register_map_[];
108
109 // Our CFI frame walker.
110 const CFIWalker cfi_walker_;
111};
112
113
114} // namespace google_breakpad
115
116
117#endif // PROCESSOR_STACKWALKER_X86_H__
118