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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>
+
+// dump_stabs.h: Define the StabsToModule class, which receives
+// STABS debugging information from a parser and adds it to a Breakpad
+// symbol file.
+
+#ifndef BREAKPAD_COMMON_STABS_TO_MODULE_H_
+#define BREAKPAD_COMMON_STABS_TO_MODULE_H_
+
+#include <stdint.h>
+
+#include <string>
+#include <vector>
+
+#include "common/module.h"
+#include "common/stabs_reader.h"
+#include "common/using_std_string.h"
+
+namespace google_breakpad {
+
+using std::vector;
+
+// A StabsToModule 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 StabsToModule thus acts as
+// the bridge between STABS and Breakpad data.
+// When processing Darwin Mach-O files, this also receives public linker
+// symbols, like those found in system libraries.
+class StabsToModule: public google_breakpad::StabsHandler {
+ public:
+  // Receive parsed debugging information from a StabsReader, and
+  // store it all in MODULE.
+  StabsToModule(Module *module) :
+      module_(module),
+      in_compilation_unit_(false),
+      comp_unit_base_address_(0),
+      current_function_(NULL),
+      current_source_file_(NULL),
+      current_source_file_name_(NULL) { }
+  ~StabsToModule();
+
+  // 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);
+  bool Extern(const string &name, uint64_t address);
+  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_;
+
+  // True if we are currently within a compilation unit: we have gotten a
+  // StartCompilationUnit call, but no matching EndCompilationUnit call
+  // yet. We use this for sanity checks.
+  bool in_compilation_unit_;
+
+  // 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  // BREAKPAD_COMMON_STABS_TO_MODULE_H_