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// Copyright (C) 2006 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// stackwalker.cc: 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 "google/stack_frame.h"
#include "processor/memory_region.h"
namespace google_airbag {
class MinidumpModuleList;
class Stackwalker {
public:
virtual ~Stackwalker() {}
// Produces a vector of StackFrames by calling GetContextFrame and
// GetCallerFrame, and populating the returned frames with module
// offset and name information if possible. The caller takes ownership
// of the StackFrames object and is responsible for freeing it.
StackFrames* Walk();
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.
Stackwalker(MemoryRegion* memory, MinidumpModuleList* modules);
// The stack memory to walk. Subclasses will require this region to
// get information from the stack.
MemoryRegion* memory_;
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. 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) = 0;
// A list of modules, for populating each StackFrame's module information.
// This field is optional and may be NULL.
MinidumpModuleList* modules_;
};
} // namespace google_airbag
#endif // PROCESSOR_STACKWALKER_H__
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