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// Copyright (c) 2006, 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.h: Generic stackwalker.
//
// The Stackwalker class is an abstract base class providing common generic
// methods that apply to stacks from all systems. Specific implementations
// will extend this class by providing GetContextFrame and GetCallerFrame
// methods to fill in system-specific data in a StackFrame structure.
// Stackwalker assembles these StackFrame strucutres into a vector of
// StackFrames.
//
// Author: Mark Mentovai
#ifndef PROCESSOR_STACKWALKER_H__
#define PROCESSOR_STACKWALKER_H__
#include <vector>
#include "google/stack_frame.h"
#include "processor/memory_region.h"
#include "processor/stack_frame_info.h"
namespace google_airbag {
class MinidumpContext;
class MinidumpModuleList;
class SymbolSupplier;
class Stackwalker {
public:
virtual ~Stackwalker() {}
// Fills the given vector of StackFrames by calling GetContextFrame and
// GetCallerFrame, and populating the returned frames with all available
// data.
void Walk(StackFrames *frames);
// Returns a new concrete subclass suitable for the CPU that a stack was
// generated on, according to the CPU type indicated by the context
// argument. If no suitable concrete subclass exists, returns NULL.
static Stackwalker* StackwalkerForCPU(MinidumpContext *context,
MemoryRegion *memory,
MinidumpModuleList *modules,
SymbolSupplier *supplier);
protected:
// memory identifies a MemoryRegion that provides the stack memory
// for the stack to walk. modules, if non-NULL, is a MinidumpModuleList
// that is used to look up which code module each stack frame is
// associated with. supplier is an optional caller-supplied SymbolSupplier
// implementation. If supplier is NULL, source line info will not be
// resolved.
Stackwalker(MemoryRegion *memory,
MinidumpModuleList *modules,
SymbolSupplier *supplier);
// The stack memory to walk. Subclasses will require this region to
// get information from the stack.
MemoryRegion *memory_;
// Additional debugging information for each stack frame. This vector
// parallels the StackFrames vector. Subclasses may use this information
// to walk the stack.
std::vector<StackFrameInfo> stack_frame_info_;
private:
// Obtains the context frame, the innermost called procedure in a stack
// trace. Returns false on failure.
virtual bool GetContextFrame(StackFrame *frame) = 0;
// Obtains a caller frame. Each call to GetCallerFrame should return the
// frame that called the last frame returned by GetContextFrame or
// GetCallerFrame. To aid this purpose, walked_frames contains the
// StackFrames vector of frames that have already been walked.
// GetCallerFrame should return false on failure or when there are no more
// caller frames (when the end of the stack has been reached).
virtual bool GetCallerFrame(StackFrame *frame,
const StackFrames *walked_frames) = 0;
// A list of modules, for populating each StackFrame's module information.
// This field is optional and may be NULL.
MinidumpModuleList *modules_;
// The optional SymbolSupplier for resolving source line info.
SymbolSupplier *supplier_;
};
} // namespace google_airbag
#endif // PROCESSOR_STACKWALKER_H__
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