base/location.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "build/build_config.h"
   6
   7 #if defined(COMPILER_MSVC)
   8 // MSDN says to #include <intrin.h>, but that breaks the VS2005 build.
   9 extern "C" {
  10   void* _ReturnAddress();
  11 }
  12 #endif
  13
  14 #include "base/location.h"
  15 #include "base/stringprintf.h"
  16 #include "base/strings/string_number_conversions.h"
  17
  18 namespace tracked_objects {
  19
  20 Location::Location(const char* function_name,
  21                    const char* file_name,
  22                    int line_number,
  23                    const void* program_counter)
  24     : function_name_(function_name),
  25       file_name_(file_name),
  26       line_number_(line_number),
  27       program_counter_(program_counter) {
  28 }
  29
  30 Location::Location()
  31     : function_name_("Unknown"),
  32       file_name_("Unknown"),
  33       line_number_(-1),
  34       program_counter_(NULL) {
  35 }
  36
  37 std::string Location::ToString() const {
  38   return std::string(function_name_) + "@" + file_name_ + ":" +
  39       base::IntToString(line_number_);
  40 }
  41
  42 void Location::Write(bool display_filename, bool display_function_name,
  43                      std::string* output) const {
  44   base::StringAppendF(output, "%s[%d] ",
  45       display_filename ? file_name_ : "line",
  46       line_number_);
  47
  48   if (display_function_name) {
  49     WriteFunctionName(output);
  50     output->push_back(' ');
  51   }
  52 }
  53
  54 void Location::WriteFunctionName(std::string* output) const {
  55   // Translate "<" to "&lt;" for HTML safety.
  56   // TODO(jar): Support ASCII or html for logging in ASCII.
  57   for (const char *p = function_name_; *p; p++) {
  58     switch (*p) {
  59       case '<':
  60         output->append("&lt;");
  61         break;
  62
  63       case '>':
  64         output->append("&gt;");
  65         break;
  66
  67       default:
  68         output->push_back(*p);
  69         break;
  70     }
  71   }
  72 }
  73
  74 //------------------------------------------------------------------------------
  75 LocationSnapshot::LocationSnapshot() : line_number(-1) {
  76 }
  77
  78 LocationSnapshot::LocationSnapshot(
  79     const tracked_objects::Location& location)
  80     : file_name(location.file_name()),
  81       function_name(location.function_name()),
  82       line_number(location.line_number()) {
  83 }
  84
  85 LocationSnapshot::~LocationSnapshot() {
  86 }
  87
  88 //------------------------------------------------------------------------------
  89 #if defined(COMPILER_MSVC)
  90 __declspec(noinline)
  91 #endif
  92 BASE_EXPORT const void* GetProgramCounter() {
  93 #if defined(COMPILER_MSVC)
  94   return _ReturnAddress();
  95 #elif defined(COMPILER_GCC)
  96   return __builtin_extract_return_addr(__builtin_return_address(0));
  97 #endif  // COMPILER_GCC
  98
  99   return NULL;
 100 }
 101
 102 }  // namespace tracked_objects