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// 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_amd64.h: amd64-specific stackwalker.
//
// Provides stack frames given amd64 register context and a memory region
// corresponding to a amd64 stack.
//
// Author: Mark Mentovai, Ted Mielczarek
#ifndef PROCESSOR_STACKWALKER_AMD64_H__
#define PROCESSOR_STACKWALKER_AMD64_H__
#include <vector>
#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 StackwalkerAMD64 : public Stackwalker {
public:
// context is a amd64 context object that gives access to amd64-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.
StackwalkerAMD64(const SystemInfo* system_info,
const MDRawContextAMD64* context,
MemoryRegion* memory,
const CodeModules* modules,
StackFrameSymbolizer* frame_symbolizer);
private:
// A STACK CFI-driven frame walker for the AMD64
typedef SimpleCFIWalker<uint64_t, MDRawContextAMD64> CFIWalker;
// Implementation of Stackwalker, using amd64 context (stack pointer in %rsp,
// stack base in %rbp) and stack conventions (saved stack pointer at 0(%rbp))
virtual StackFrame* GetContextFrame();
virtual StackFrame* GetCallerFrame(const CallStack* stack,
bool stack_scan_allowed);
// 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.
StackFrameAMD64* GetCallerByCFIFrameInfo(const vector<StackFrame*> &frames,
CFIFrameInfo* cfi_frame_info);
// Checks whether end-of-stack is reached. An instruction address of 0 is an
// end-of-stack marker. If the stack pointer of the caller is at a lower
// address than the stack pointer of the callee, then that's clearly incorrect
// and it is treated as end-of-stack to enforce progress and avoid infinite
// loops.
bool IsEndOfStack(uint64_t caller_rip, uint64_t caller_rsp,
uint64_t callee_rsp);
// Assumes a traditional frame layout where the frame pointer has not been
// omitted. The expectation is that caller's %rbp is pushed to the stack
// after the return address of the callee, and that the callee's %rsp can
// be used to find the pushed %rbp.
// Caller owns the returned frame object. Returns NULL on failure.
StackFrameAMD64* GetCallerByFramePointerRecovery(
const vector<StackFrame*>& frames);
// Scan the stack for plausible return addresses. The caller takes ownership
// of the returned frame. Return NULL on failure.
StackFrameAMD64* GetCallerByStackScan(const vector<StackFrame*> &frames);
// Stores the CPU context corresponding to the innermost stack frame to
// be returned by GetContextFrame.
const MDRawContextAMD64* 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_AMD64_H__
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