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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.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 CallStack.
//
// Author: Mark Mentovai
#ifndef GOOGLE_BREAKPAD_PROCESSOR_STACKWALKER_H__
#define GOOGLE_BREAKPAD_PROCESSOR_STACKWALKER_H__
#include <set>
#include <string>
#include "google_breakpad/common/breakpad_types.h"
#include "google_breakpad/processor/code_modules.h"
#include "google_breakpad/processor/memory_region.h"
namespace google_breakpad {
class CallStack;
class MinidumpContext;
class SourceLineResolverInterface;
struct StackFrame;
class SymbolSupplier;
struct SystemInfo;
using std::set;
class Stackwalker {
public:
virtual ~Stackwalker() {}
// Populates the given CallStack by calling GetContextFrame and
// GetCallerFrame. The frames are further processed to fill all available
// data. Returns true if the stackwalk completed, or false if it was
// interrupted by SymbolSupplier::GetSymbolFile().
bool Walk(CallStack *stack);
// 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(const SystemInfo *system_info,
MinidumpContext *context,
MemoryRegion *memory,
const CodeModules *modules,
SymbolSupplier *supplier,
SourceLineResolverInterface *resolver);
static void set_max_frames(u_int32_t max_frames) { max_frames_ = max_frames; }
static u_int32_t max_frames() { return max_frames_; }
protected:
// system_info identifies the operating system, NULL or empty if unknown.
// memory identifies a MemoryRegion that provides the stack memory
// for the stack to walk. modules, if non-NULL, is a CodeModules
// object 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. resolver is an instance of SourceLineResolverInterface
// (see source_line_resolver_interface.h and basic_source_line_resolver.h).
// If resolver is NULL, source line info will not be resolved.
Stackwalker(const SystemInfo *system_info,
MemoryRegion *memory,
const CodeModules *modules,
SymbolSupplier *supplier,
SourceLineResolverInterface *resolver);
// This can be used to filter out potential return addresses when
// the stack walker resorts to stack scanning.
// Returns true if any of:
// * This address is within a loaded module, but we don't have symbols
// for that module.
// * This address is within a loaded module for which we have symbols,
// and falls inside a function in that module.
// Returns false otherwise.
bool InstructionAddressSeemsValid(u_int64_t address);
template<typename InstructionType>
bool ScanForReturnAddress(InstructionType location_start,
InstructionType *location_found,
InstructionType *ip_found) {
const int kRASearchWords = 30;
return ScanForReturnAddress(location_start, location_found, ip_found,
kRASearchWords);
}
// 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 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 ip_found to the value contained at that
// location in memory.
template<typename InstructionType>
bool ScanForReturnAddress(InstructionType location_start,
InstructionType *location_found,
InstructionType *ip_found,
int searchwords) {
for (InstructionType location = location_start;
location <= location_start + searchwords * sizeof(InstructionType);
location += sizeof(InstructionType)) {
InstructionType ip;
if (!memory_->GetMemoryAtAddress(location, &ip))
break;
if (modules_ && modules_->GetModuleForAddress(ip) &&
InstructionAddressSeemsValid(ip)) {
*ip_found = ip;
*location_found = location;
return true;
}
}
// nothing found
return false;
}
// Information about the system that produced the minidump. Subclasses
// and the SymbolSupplier may find this information useful.
const SystemInfo *system_info_;
// The stack memory to walk. Subclasses will require this region to
// get information from the stack.
MemoryRegion *memory_;
// A list of modules, for populating each StackFrame's module information.
// This field is optional and may be NULL.
const CodeModules *modules_;
protected:
// The SourceLineResolver implementation.
SourceLineResolverInterface *resolver_;
private:
// Obtains the context frame, the innermost called procedure in a stack
// trace. Returns NULL on failure. GetContextFrame allocates a new
// StackFrame (or StackFrame subclass), ownership of which is taken by
// the caller.
virtual StackFrame* GetContextFrame() = 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, stack contains the CallStack
// made of frames that have already been walked. GetCallerFrame should
// return NULL on failure or when there are no more caller frames (when
// the end of the stack has been reached). GetCallerFrame allocates a new
// StackFrame (or StackFrame subclass), ownership of which is taken by
// the caller.
virtual StackFrame* GetCallerFrame(const CallStack *stack) = 0;
// The optional SymbolSupplier for resolving source line info.
SymbolSupplier *supplier_;
// A list of modules that we haven't found symbols for. We track
// this in order to avoid repeatedly looking them up again within
// one minidump.
set<std::string> no_symbol_modules_;
// The maximum number of frames Stackwalker will walk through.
// This defaults to 1024 to prevent infinite loops.
static u_int32_t max_frames_;
};
} // namespace google_breakpad
#endif // GOOGLE_BREAKPAD_PROCESSOR_STACKWALKER_H__
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