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// Copyright (c) 2009, Google Inc. -*- mode: C++ -*-
// 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.
// dump_stabs.h: A StabsHandler that populates a Module.
#ifndef COMMON_LINUX_DUMP_STABS_H__
#define COMMON_LINUX_DUMP_STABS_H__
#include <stdint.h>
#include <string>
#include <vector>
#include "common/linux/module.h"
#include "common/linux/stabs_reader.h"
namespace google_breakpad {
using std::string;
using std::vector;
// A DumpStabsHandler is a handler that receives parsed STABS
// debugging information from a StabsReader, and uses that to populate
// a Module. (All classes are in the google_breakpad namespace.) A
// Module represents the contents of a Breakpad symbol file, and knows
// how to write itself out as such. A DumpStabsHandler thus acts as
// the bridge between STABS and Breakpad data.
class DumpStabsHandler: public google_breakpad::StabsHandler {
public:
// Receive parsed debugging information from a StabsReader, and
// store it all in MODULE.
DumpStabsHandler(Module *module) :
module_(module),
comp_unit_base_address_(0),
current_function_(NULL),
current_source_file_(NULL),
current_source_file_name_(NULL) { }
// The standard StabsHandler virtual member functions.
bool StartCompilationUnit(const char *name, uint64_t address,
const char *build_directory);
bool EndCompilationUnit(uint64_t address);
bool StartFunction(const string &name, uint64_t address);
bool EndFunction(uint64_t address);
bool Line(uint64_t address, const char *name, int number);
void Warning(const char *format, ...);
// Do any final processing necessary to make module_ contain all the
// data provided by the STABS reader.
//
// Because STABS does not provide reliable size information for
// functions and lines, we need to make a pass over the data after
// processing all the STABS to compute those sizes. We take care of
// that here.
void Finalize();
private:
// An arbitrary, but very large, size to use for functions whose
// size we can't compute properly.
static const uint64_t kFallbackSize = 0x10000000;
// The module we're contributing debugging info to.
Module *module_;
// The functions we've generated so far. We don't add these to
// module_ as we parse them. Instead, we wait until we've computed
// their ending address, and their lines' ending addresses.
//
// We could just stick them in module_ from the outset, but if
// module_ already contains data gathered from other debugging
// formats, that would complicate the size computation.
vector<Module::Function *> functions_;
// Boundary addresses. STABS doesn't necessarily supply sizes for
// functions and lines, so we need to compute them ourselves by
// finding the next object.
vector<Module::Address> boundaries_;
// The base address of the current compilation unit. We use this to
// recognize functions we should omit from the symbol file. (If you
// know the details of why we omit these, please patch this
// comment.)
Module::Address comp_unit_base_address_;
// The function we're currently contributing lines to.
Module::Function *current_function_;
// The last Module::File we got a line number in.
Module::File *current_source_file_;
// The pointer in the .stabstr section of the name that
// current_source_file_ is built from. This allows us to quickly
// recognize when the current line is in the same file as the
// previous one (which it usually is).
const char *current_source_file_name_;
};
} // namespace google_breakpad
#endif // COMMON_LINUX_DUMP_STABS_H__
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