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+// 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 <unordered_map>
+#include <string>
+
+#include "common/windows/omap.h"
+
+struct IDiaEnumLineNumbers;
+struct IDiaSession;
+struct IDiaSymbol;
+
+namespace google_breakpad {
+
+using std::wstring;
+using std::unordered_map;
+
+// A structure that carries information that identifies a pdb file.
+struct PDBModuleInfo {
+ public:
+  // The basename of the pdb file from which information was loaded.
+  wstring debug_file;
+
+  // The pdb's identifier.  For recent pdb files, the identifier consists
+  // of the pdb's guid, in uppercase hexadecimal form without any dashes
+  // or separators, followed immediately by the pdb's age, also in
+  // uppercase hexadecimal form.  For older pdb files which have no guid,
+  // the identifier is the pdb's 32-bit signature value, in zero-padded
+  // hexadecimal form, followed immediately by the pdb's age, in lowercase
+  // hexadecimal form.
+  wstring debug_identifier;
+
+  // A string identifying the cpu that the pdb is associated with.
+  // Currently, this may be "x86" or "unknown".
+  wstring cpu;
+};
+
+// A structure that carries information that identifies a PE file,
+// either an EXE or a DLL.
+struct PEModuleInfo {
+  // The basename of the PE file.
+  wstring code_file;
+
+  // The PE file's code identifier, which consists of its timestamp
+  // and file size concatenated together into a single hex string.
+  // (The fields IMAGE_OPTIONAL_HEADER::SizeOfImage and
+  // IMAGE_FILE_HEADER::TimeDateStamp, as defined in the ImageHlp
+  // documentation.) This is not well documented, if it's documented
+  // at all, but it's what symstore does and what DbgHelp supports.
+  wstring code_identifier;
+};
+
+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);
+
+  // 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 map file from the current pdb file to the given file stream.
+  // Returns true on success.
+  bool WriteMap(FILE *map_file);
+
+  // Closes the current pdb file and its associated resources.
+  void Close();
+
+  // 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.
+  // Returns true on success.
+  bool PrintFunction(IDiaSymbol *function, IDiaSymbol *block);
+
+  // 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.
+  bool PrintCodePublicSymbol(IDiaSymbol *symbol);
+
+  // 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_