pdb_source_line_writer.h

// Copyright (c) 2006, 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.

// PDBSourceLineWriter uses a pdb file produced by Visual C++ to output

// a line/address map for use with BasicSourceLineResolver.

#ifndef COMMON_WINDOWS_PDB_SOURCE_LINE_WRITER_H_

#define COMMON_WINDOWS_PDB_SOURCE_LINE_WRITER_H_

#include <atlcomcli.h>

#include <string>

#include <unordered_map>

#include "common/windows/module_info.h"

#include "common/windows/omap.h"

struct IDiaEnumLineNumbers;

struct IDiaSession;

struct IDiaSymbol;

namespace google_breakpad {

using std::wstring;

using std::unordered_map;

class PDBSourceLineWriter {

 public:

  enum FileFormat {

    PDB_FILE,  // a .pdb file containing debug symbols

    EXE_FILE,  // a .exe or .dll file

    ANY_FILE   // try PDB_FILE and then EXE_FILE

};

  explicit PDBSourceLineWriter();

  ~PDBSourceLineWriter();

  // Opens the given file.  For executable files, the corresponding pdb

  // file must be available; Open will be if it is not.

  // If there is already a pdb file open, it is automatically closed.

  // Returns true on success.

  bool Open(const wstring &file, FileFormat format);

  // Closes the current pdb file and its associated resources.

  void Close();

  // Sets the code file full path.  This is optional for 32-bit modules.  It is

  // also optional for 64-bit modules when there is an executable file stored

  // in the same directory as the PDB file.  It is only required for 64-bit

  // modules when the executable file is not in the same location as the PDB

  // file and it must be called after Open() and before WriteMap().

  // If Open() was called for an executable file, then it is an error to call

  // SetCodeFile() with a different file path and it will return false.

  bool SetCodeFile(const wstring &exe_file);

  // Writes a Breakpad symbol file from the current pdb file to |symbol_file|.

  // Returns true on success.

  bool WriteSymbols(FILE *symbol_file);

  // Retrieves information about the module's debugging file.  Returns

  // true on success and false on failure.

  bool GetModuleInfo(PDBModuleInfo *info);

  // Retrieves information about the module's PE file.  Returns

  // true on success and false on failure.

  bool GetPEInfo(PEModuleInfo *info);

  // Sets uses_guid to true if the opened file uses a new-style CodeView

  // record with a 128-bit GUID, or false if the opened file uses an old-style

  // CodeView record.  When no GUID is available, a 32-bit signature should be

  // used to identify the module instead.  If the information cannot be

  // determined, this method returns false.

  bool UsesGUID(bool *uses_guid);

 private:

  // Outputs the line/address pairs for each line in the enumerator.

  // Returns true on success.

  bool PrintLines(IDiaEnumLineNumbers *lines);

  // Outputs a function address and name, followed by its source line list.

  // block can be the same object as function, or it can be a reference to a

  // code block that is lexically part of this function, but resides at a

  // separate address. If has_multiple_symbols is true, this function's

  // instructions correspond to multiple symbols. Returns true on success.

  bool PrintFunction(IDiaSymbol *function, IDiaSymbol *block,

                     bool has_multiple_symbols);

  // Outputs all functions as described above.  Returns true on success.

  bool PrintFunctions();

  // Outputs all of the source files in the session's pdb file.

  // Returns true on success.

  bool PrintSourceFiles();

  // Outputs all of the frame information necessary to construct stack

  // backtraces in the absence of frame pointers. For x86 data stored in

  // .pdb files. Returns true on success.

  bool PrintFrameDataUsingPDB();

  // Outputs all of the frame information necessary to construct stack

  // backtraces in the absence of frame pointers. For x64 data stored in

  // .exe, .dll files. Returns true on success.

  bool PrintFrameDataUsingEXE();

  // Outputs all of the frame information necessary to construct stack

  // backtraces in the absence of frame pointers.  Returns true on success.

  bool PrintFrameData();

  // Outputs a single public symbol address and name, if the symbol corresponds

  // to a code address.  Returns true on success.  If symbol is does not

  // correspond to code, returns true without outputting anything. If

  // has_multiple_symbols is true, the symbol corresponds to a code address and

  // the instructions correspond to multiple symbols.

  bool PrintCodePublicSymbol(IDiaSymbol *symbol, bool has_multiple_symbols);

  // Outputs a line identifying the PDB file that is being dumped, along with

  // its uuid and age.

  bool PrintPDBInfo();

  // Outputs a line identifying the PE file corresponding to the PDB

  // file that is being dumped, along with its code identifier,

  // which consists of its timestamp and file size.

  bool PrintPEInfo();

  // Returns true if this filename has already been seen,

  // and an ID is stored for it, or false if it has not.

  bool FileIDIsCached(const wstring &file) {

    return unique_files_.find(file) != unique_files_.end();

  // Cache this filename and ID for later reuse.

  void CacheFileID(const wstring &file, DWORD id) {

    unique_files_[file] = id;

  // Store this ID in the cache as a duplicate for this filename.

  void StoreDuplicateFileID(const wstring &file, DWORD id) {

    unordered_map<wstring, DWORD>::iterator iter = unique_files_.find(file);

    if (iter != unique_files_.end()) {

      // map this id to the previously seen one

      file_ids_[id] = iter->second;

  // Given a file's unique ID, return the ID that should be used to

  // reference it. There may be multiple files with identical filenames

  // but different unique IDs. The cache attempts to coalesce these into

  // one ID per unique filename.

  DWORD GetRealFileID(DWORD id) {

    unordered_map<DWORD, DWORD>::iterator iter = file_ids_.find(id);

    if (iter == file_ids_.end())

      return id;

    return iter->second;

  // Find the PE file corresponding to the loaded PDB file, and

  // set the code_file_ member. Returns false on failure.

  bool FindPEFile();

  // Returns the function name for a symbol.  If possible, the name is

  // undecorated.  If the symbol's decorated form indicates the size of

  // parameters on the stack, this information is returned in stack_param_size.

  // Returns true on success.  If the symbol doesn't encode parameter size

  // information, stack_param_size is set to -1.

  static bool GetSymbolFunctionName(IDiaSymbol *function, BSTR *name,

                                    int *stack_param_size);

  // Returns the number of bytes of stack space used for a function's

  // parameters.  function must have the tag SymTagFunction.  In the event of

  // a failure, returns 0, which is also a valid number of bytes.

  static int GetFunctionStackParamSize(IDiaSymbol *function);

  // The filename of the PE file corresponding to the currently-open

  // pdb file.

  wstring code_file_;

  // The session for the currently-open pdb file.

  CComPtr<IDiaSession> session_;

  // The current output file for this WriteMap invocation.

  FILE *output_;

  // There may be many duplicate filenames with different IDs.

  // This maps from the DIA "unique ID" to a single ID per unique

  // filename.

  unordered_map<DWORD, DWORD> file_ids_;

  // This maps unique filenames to file IDs.

  unordered_map<wstring, DWORD> unique_files_;

  // This is used for calculating post-transform symbol addresses and lengths.

  ImageMap image_map_;

  // Disallow copy ctor and operator=

  PDBSourceLineWriter(const PDBSourceLineWriter&);

  void operator=(const PDBSourceLineWriter&);

};

}  // namespace google_breakpad

#endif  // COMMON_WINDOWS_PDB_SOURCE_LINE_WRITER_H_

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