The Tor Browser: toolkit/crashreporter/google-breakpad/src/common/dwarf_line_to

toolkit/crashreporter/google-breakpad/src/common/dwarf_line_to_module.h@129ffea94266 (annotated)

toolkit/crashreporter/google-breakpad/src/common/dwarf_line_to_module.h

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 // -*- 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>
 // The DwarfLineToModule class accepts line number information from a
 // DWARF parser and adds it to a google_breakpad::Module. The Module
 // can write that data out as a Breakpad symbol file.
 #ifndef COMMON_LINUX_DWARF_LINE_TO_MODULE_H
 #define COMMON_LINUX_DWARF_LINE_TO_MODULE_H
 #include <string>
 #include "common/module.h"
 #include "common/dwarf/dwarf2reader.h"
 #include "common/using_std_string.h"
 namespace google_breakpad {
 // A class for producing a vector of google_breakpad::Module::Line
 // instances from parsed DWARF line number data.
 //
 // An instance of this class can be provided as a handler to a
 // dwarf2reader::LineInfo DWARF line number information parser. The
 // handler accepts source location information from the parser and
 // uses it to produce a vector of google_breakpad::Module::Line
 // objects, referring to google_breakpad::Module::File objects added
 // to a particular google_breakpad::Module.
 //
 // GNU toolchain omitted sections support:
 // ======================================
 //
 // Given the right options, the GNU toolchain will omit unreferenced
 // functions from the final executable. Unfortunately, when it does so, it
 // does not remove the associated portions of the DWARF line number
 // program; instead, it gives the DW_LNE_set_address instructions referring
 // to the now-deleted code addresses of zero. Given this input, the DWARF
 // line parser will call AddLine with a series of lines starting at address
 // zero. For example, here is the output from 'readelf -wl' for a program
 // with four functions, the first three of which have been omitted:
 //
 //   Line Number Statements:
 //    Extended opcode 2: set Address to 0x0
 //    Advance Line by 14 to 15
 //    Copy
 //    Special opcode 48: advance Address by 3 to 0x3 and Line by 1 to 16
 //    Special opcode 119: advance Address by 8 to 0xb and Line by 2 to 18
 //    Advance PC by 2 to 0xd
 //    Extended opcode 1: End of Sequence
 //
 //    Extended opcode 2: set Address to 0x0
 //    Advance Line by 14 to 15
 //    Copy
 //    Special opcode 48: advance Address by 3 to 0x3 and Line by 1 to 16
 //    Special opcode 119: advance Address by 8 to 0xb and Line by 2 to 18
 //    Advance PC by 2 to 0xd
 //    Extended opcode 1: End of Sequence
 //
 //    Extended opcode 2: set Address to 0x0
 //    Advance Line by 19 to 20
 //    Copy
 //    Special opcode 48: advance Address by 3 to 0x3 and Line by 1 to 21
 //    Special opcode 76: advance Address by 5 to 0x8 and Line by 1 to 22
 //    Advance PC by 2 to 0xa
 //    Extended opcode 1: End of Sequence
 //
 //    Extended opcode 2: set Address to 0x80483a4
 //    Advance Line by 23 to 24
 //    Copy
 //    Special opcode 202: advance Address by 14 to 0x80483b2 and Line by 1 to 25
 //    Special opcode 76: advance Address by 5 to 0x80483b7 and Line by 1 to 26
 //    Advance PC by 6 to 0x80483bd
 //    Extended opcode 1: End of Sequence
 //
 // Instead of collecting runs of lines describing code that is not there,
 // we try to recognize and drop them. Since the linker doesn't explicitly
 // distinguish references to dropped sections from genuine references to
 // code at address zero, we must use a heuristic. We have chosen:
 //
 // - If a line starts at address zero, omit it. (On the platforms
 //   breakpad targets, it is extremely unlikely that there will be code
 //   at address zero.)
 //
 // - If a line starts immediately after an omitted line, omit it too.
 class DwarfLineToModule: public dwarf2reader::LineInfoHandler {
  public:
   // As the DWARF line info parser passes us line records, add source
   // files to MODULE, and add all lines to the end of LINES. LINES
   // need not be empty. If the parser hands us a zero-length line, we
   // omit it. If the parser hands us a line that extends beyond the
   // end of the address space, we clip it. It's up to our client to
   // sort out which lines belong to which functions; we don't add them
   // to any particular function in MODULE ourselves.
   DwarfLineToModule(Module *module, const string& compilation_dir,
                     vector<Module::Line> *lines)
       : module_(module),
         compilation_dir_(compilation_dir),
         lines_(lines),
         highest_file_number_(-1),
         omitted_line_end_(0),
         warned_bad_file_number_(false),
         warned_bad_directory_number_(false) { }
   ~DwarfLineToModule() { }
   void DefineDir(const string &name, uint32 dir_num);
   void DefineFile(const string &name, int32 file_num,
                   uint32 dir_num, uint64 mod_time,
                   uint64 length);
   void AddLine(uint64 address, uint64 length,
                uint32 file_num, uint32 line_num, uint32 column_num);
  private:
   typedef std::map<uint32, string> DirectoryTable;
   typedef std::map<uint32, Module::File *> FileTable;
   // The module we're contributing debugging info to. Owned by our
   // client.
   Module *module_;
   // The compilation directory for the current compilation unit whose
   // lines are being accumulated.
   string compilation_dir_;
   // The vector of lines we're accumulating. Owned by our client.
   //
   // In a Module, as in a breakpad symbol file, lines belong to
   // specific functions, but DWARF simply assigns lines to addresses;
   // one must infer the line/function relationship using the
   // functions' beginning and ending addresses. So we can't add these
   // to the appropriate function from module_ until we've read the
   // function info as well. Instead, we accumulate lines here, and let
   // whoever constructed this sort it all out.
   vector<Module::Line> *lines_;
   // A table mapping directory numbers to paths.
   DirectoryTable directories_;
   // A table mapping file numbers to Module::File pointers.
   FileTable files_;
   // The highest file number we've seen so far, or -1 if we've seen
   // none.  Used for dynamically defined file numbers.
   int32 highest_file_number_;
   // This is the ending address of the last line we omitted, or zero if we
   // didn't omit the previous line. It is zero before we have received any
   // AddLine calls.
   uint64 omitted_line_end_;
   // True if we've warned about:
   bool warned_bad_file_number_; // bad file numbers
   bool warned_bad_directory_number_; // bad directory numbers
 };
 } // namespace google_breakpad
 #endif // COMMON_LINUX_DWARF_LINE_TO_MODULE_H

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toolkit/crashreporter/google-breakpad/src/common/dwarf_line_to_module.h@129ffea94266 (annotated)

toolkit/crashreporter/google-breakpad/src/common/dwarf_line_to_module.h