From bb0840c0025a75dd3b85b746ebcec7deb7d9fe1c Mon Sep 17 00:00:00 2001
From: iddqd <iddqd@yandex-team.com>
Date: Thu, 19 Dec 2024 10:46:06 +0300
Subject: Add contib/libs/breakpad to export
commit_hash:9d85255f8d9249f14105e4626bf4484805b8aed4
---
.../breakpad/src/common/dwarf_line_to_module.h | 191 +++++++++++++++++++++
1 file changed, 191 insertions(+)
create mode 100644 contrib/libs/breakpad/src/common/dwarf_line_to_module.h
(limited to 'contrib/libs/breakpad/src/common/dwarf_line_to_module.h')
diff --git a/contrib/libs/breakpad/src/common/dwarf_line_to_module.h b/contrib/libs/breakpad/src/common/dwarf_line_to_module.h
new file mode 100644
index 0000000000..da2c5f0ec5
--- /dev/null
+++ b/contrib/libs/breakpad/src/common/dwarf_line_to_module.h
@@ -0,0 +1,191 @@
+// -*- 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
+// 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 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,
+ std::map<uint32_t, Module::File*>* files)
+ : module_(module),
+ compilation_dir_(compilation_dir),
+ lines_(lines),
+ files_(files),
+ 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_t dir_num);
+ void DefineFile(const string& name, int32_t file_num,
+ uint32_t dir_num, uint64_t mod_time,
+ uint64_t length);
+ void AddLine(uint64_t address, uint64_t length,
+ uint32_t file_num, uint32_t line_num, uint32_t column_num);
+
+ private:
+
+ typedef std::map<uint32_t, string> DirectoryTable;
+ typedef std::map<uint32_t, 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_t 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_t 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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