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// -*- mode: c++ -*-
// Copyright (c) 2010 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// stackwalker_x86.h: x86-specific stackwalker.
//
// Provides stack frames given x86 register context and a memory region
// corresponding to an x86 stack.
//
// Author: Mark Mentovai
#ifndef PROCESSOR_STACKWALKER_X86_H__
#define PROCESSOR_STACKWALKER_X86_H__
#include "google_breakpad/common/breakpad_types.h"
#include "google_breakpad/common/minidump_format.h"
#include "google_breakpad/processor/stackwalker.h"
#include "google_breakpad/processor/stack_frame_cpu.h"
#include "processor/cfi_frame_info.h"
namespace google_breakpad {
class CodeModules;
class StackwalkerX86 : public Stackwalker {
public:
// context is an x86 context object that gives access to x86-specific
// register state corresponding to the innermost called frame to be
// included in the stack. The other arguments are passed directly through
// to the base Stackwalker constructor.
StackwalkerX86(const SystemInfo *system_info,
const MDRawContextX86 *context,
MemoryRegion *memory,
const CodeModules *modules,
SymbolSupplier *supplier,
SourceLineResolverInterface *resolver);
private:
// A STACK CFI-driven frame walker for the X86.
typedef SimpleCFIWalker<u_int32_t, MDRawContextX86> CFIWalker;
// Implementation of Stackwalker, using x86 context (%ebp, %esp, %eip) and
// stack conventions (saved %ebp at [%ebp], saved %eip at 4[%ebp], or
// alternate conventions as guided by any WindowsFrameInfo available for the
// code in question.).
virtual StackFrame *GetContextFrame();
virtual StackFrame *GetCallerFrame(const CallStack *stack);
// Use windows_frame_info (derived from STACK WIN and FUNC records)
// to construct the frame that called frames.back(). The caller
// takes ownership of the returned frame. Return NULL on failure.
StackFrameX86 *GetCallerByWindowsFrameInfo(
const vector<StackFrame*> &frames,
WindowsFrameInfo *windows_frame_info);
// Use cfi_frame_info (derived from STACK CFI records) to construct
// the frame that called frames.back(). The caller takes ownership
// of the returned frame. Return NULL on failure.
StackFrameX86 *GetCallerByCFIFrameInfo(const vector<StackFrame*> &frames,
CFIFrameInfo *cfi_frame_info);
// Assuming a traditional frame layout --- where the caller's %ebp
// has been pushed just after the return address and the callee's
// %ebp points to the saved %ebp --- construct the frame that called
// frames.back(). The caller takes ownership of the returned frame.
// Return NULL on failure.
StackFrameX86 *GetCallerByEBPAtBase(const vector<StackFrame*> &frames);
// Scan the stack starting at location_start, looking for an address
// that looks like a valid instruction pointer. Addresses must
// 1) be contained in the current stack memory
// 2) pass the checks in Stackwalker::InstructionAddressSeemsValid
//
// Returns true if a valid-looking instruction pointer was found.
// When returning true, sets location_found to the address at which
// the value was found, and eip_found to the value contained at that
// location in memory.
bool ScanForReturnAddress(u_int32_t location_start,
u_int32_t *location_found,
u_int32_t *eip_found);
// Stores the CPU context corresponding to the innermost stack frame to
// be returned by GetContextFrame.
const MDRawContextX86 *context_;
// Our register map, for cfi_walker_.
static const CFIWalker::RegisterSet cfi_register_map_[];
// Our CFI frame walker.
const CFIWalker cfi_walker_;
};
} // namespace google_breakpad
#endif // PROCESSOR_STACKWALKER_X86_H__
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