Import google-glog's Symbolize() and use it in debug_util_posix.cc.

base/third_party/symbolize/symbolize.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.
+//
+// Author: Satoru Takabayashi
+//
+// This library provides Symbolize() function that symbolizes program
+// counters to their corresponding symbol names on linux platforms.
+// This library has a minimal implementation of an ELF symbol table
+// reader (i.e. it doesn't depend on libelf, etc.).
+//
+// The algorithm used in Symbolize() is as follows.
+//
+//   1. Go through a list of maps in /proc/self/maps and find the map
+//   containing the program counter.
+//
+//   2. Open the mapped file and find a regular symbol table inside.
+//   Iterate over symbols in the symbol table and look for the symbol
+//   containing the program counter.  If such a symbol is found,
+//   obtain the symbol name, and demangle the symbol if possible.
+//   If the symbol isn't found in the regular symbol table (binary is
+//   stripped), try the same thing with a dynamic symbol table.
+//
+// Note that Symbolize() is originally implemented to be used in
+// FailureSignalHandler() in base/google.cc.  Hence it doesn't use
+// malloc() and other unsafe operations.  It should be both
+// thread-safe and async-signal-safe.
+
+#ifndef BASE_SYMBOLIZE_H_
+#define BASE_SYMBOLIZE_H_
+
+#include "utilities.h"
+#include "config.h"
+#include "glog/logging.h"
+
+#ifdef HAVE_SYMBOLIZE
+
+#if defined(__ELF__)  // defined by gcc on Linux
+#include <elf.h>
+#include <link.h>  // For ElfW() macro.
+
+// If there is no ElfW macro, let's define it by ourself.
+#ifndef ElfW
+# if SIZEOF_VOID_P == 4
+#  define ElfW(type) Elf32_##type
+# elif SIZEOF_VOID_P == 8
+#  define ElfW(type) Elf64_##type
+# else
+#  error "Unknown sizeof(void *)"
+# endif
+#endif
+
+_START_GOOGLE_NAMESPACE_
+
+// Gets the section header for the given name, if it exists. Returns true on
+// success. Otherwise, returns false.
+bool GetSectionHeaderByName(int fd, const char *name, size_t name_len,
+                            ElfW(Shdr) *out);
+
+_END_GOOGLE_NAMESPACE_
+
+#endif  /* __ELF__ */
+
+_START_GOOGLE_NAMESPACE_
+
+// Installs a callback function, which will be called right before a symbol name
+// is printed. The callback is intended to be used for showing a file name and a
+// line number preceding a symbol name.
+// "fd" is a file descriptor of the object file containing the program
+// counter "pc". The callback function should write output to "out"
+// and return the size of the output written. On error, the callback
+// function should return -1.
+typedef int (*SymbolizeCallback)(int fd, void *pc, char *out, size_t out_size,
+                                 uint64 relocation);
+void InstallSymbolizeCallback(SymbolizeCallback callback);
+
+_END_GOOGLE_NAMESPACE_
+
+#endif
+
+_START_GOOGLE_NAMESPACE_
+
+// Symbolizes a program counter.  On success, returns true and write the
+// symbol name to "out".  The symbol name is demangled if possible
+// (supports symbols generated by GCC 3.x or newer).  Otherwise,
+// returns false.
+bool Symbolize(void *pc, char *out, int out_size);
+
+_END_GOOGLE_NAMESPACE_
+
+#endif  // BASE_SYMBOLIZE_H_