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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.
// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
// dwarf_cfi_to_module.h: Define the DwarfCFIToModule class, which
// accepts parsed DWARF call frame info and adds it to a
// google_breakpad::Module object, which can write that information to
// a Breakpad symbol file.
#ifndef COMMON_LINUX_DWARF_CFI_TO_MODULE_H
#define COMMON_LINUX_DWARF_CFI_TO_MODULE_H
#include <cassert>
#include <string>
#include <vector>
#include "common/module.h"
#include "common/dwarf/dwarf2reader.h"
namespace google_breakpad {
using dwarf2reader::CallFrameInfo;
using google_breakpad::Module;
using std::string;
using std::vector;
// A class that accepts parsed call frame information from the DWARF
// CFI parser and populates a google_breakpad::Module object with the
// contents.
class DwarfCFIToModule: public CallFrameInfo::Handler {
public:
// DwarfCFIToModule uses an instance of this class to report errors
// detected while converting DWARF CFI to Breakpad STACK CFI records.
class Reporter {
public:
// Create a reporter that writes messages to the standard error
// stream. FILE is the name of the file we're processing, and
// SECTION is the name of the section within that file that we're
// looking at (.debug_frame, .eh_frame, etc.).
Reporter(const string &file, const string §ion)
: file_(file), section_(section) { }
virtual ~Reporter() { }
// The DWARF CFI entry at OFFSET cites register REG, but REG is not
// covered by the vector of register names passed to the
// DwarfCFIToModule constructor, nor does it match the return
// address column number for this entry.
virtual void UnnamedRegister(size_t offset, int reg);
// The DWARF CFI entry at OFFSET says that REG is undefined, but the
// Breakpad symbol file format cannot express this.
virtual void UndefinedNotSupported(size_t offset, const string ®);
// The DWARF CFI entry at OFFSET says that REG uses a DWARF
// expression to find its value, but DwarfCFIToModule is not
// capable of translating DWARF expressions to Breakpad postfix
// expressions.
virtual void ExpressionsNotSupported(size_t offset, const string ®);
protected:
string file_, section_;
};
// Create a handler for the dwarf2reader::CallFrameInfo parser that
// records the stack unwinding information it receives in MODULE.
//
// Use REGISTER_NAMES[I] as the name of register number I; *this
// keeps a reference to the vector, so the vector should remain
// alive for as long as the DwarfCFIToModule does.
//
// Use REPORTER for reporting problems encountered in the conversion
// process.
DwarfCFIToModule(Module *module, const vector<string> ®ister_names,
Reporter *reporter)
: module_(module), register_names_(register_names), reporter_(reporter),
entry_(NULL), return_address_(-1) { }
virtual ~DwarfCFIToModule() { delete entry_; }
virtual bool Entry(size_t offset, uint64 address, uint64 length,
uint8 version, const string &augmentation,
unsigned return_address);
virtual bool UndefinedRule(uint64 address, int reg);
virtual bool SameValueRule(uint64 address, int reg);
virtual bool OffsetRule(uint64 address, int reg,
int base_register, long offset);
virtual bool ValOffsetRule(uint64 address, int reg,
int base_register, long offset);
virtual bool RegisterRule(uint64 address, int reg, int base_register);
virtual bool ExpressionRule(uint64 address, int reg,
const string &expression);
virtual bool ValExpressionRule(uint64 address, int reg,
const string &expression);
virtual bool End();
private:
// Return the name to use for register REG.
string RegisterName(int i);
// Record RULE for register REG at ADDRESS.
void Record(Module::Address address, int reg, const string &rule);
// The module to which we should add entries.
Module *module_;
// Map from register numbers to register names.
const vector<string> ®ister_names_;
// The reporter to use to report problems.
Reporter *reporter_;
// The current entry we're constructing.
Module::StackFrameEntry *entry_;
// The section offset of the current frame description entry, for
// use in error messages.
size_t entry_offset_;
// The return address column for that entry.
unsigned return_address_;
};
} // namespace google_breakpad
#endif // COMMON_LINUX_DWARF_CFI_TO_MODULE_H
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