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 #include <intrin.h>
   9 #endif
  10
  11 #include "base/location.h"
  12 #include "base/strings/string_number_conversions.h"
  13 #include "base/strings/stringprintf.h"
  14
  15 namespace tracked_objects {
  16
  17 Location::Location(const char* function_name,
  18                    const char* file_name,
  19                    int line_number,
  20                    const void* program_counter)
  21     : function_name_(function_name),
  22       file_name_(file_name),
  23       line_number_(line_number),
  24       program_counter_(program_counter) {
  25 }
  26
  27 Location::Location()
  28     : function_name_("Unknown"),
  29       file_name_("Unknown"),
  30       line_number_(-1),
  31       program_counter_(NULL) {
  32 }
  33
  34 Location::Location(const Location& other)
  35     : function_name_(other.function_name_),
  36       file_name_(other.file_name_),
  37       line_number_(other.line_number_),
  38       program_counter_(other.program_counter_) {
  39 }
  40
  41 std::string Location::ToString() const {
  42   return std::string(function_name_) + "@" + file_name_ + ":" +
  43       base::IntToString(line_number_);
  44 }
  45
  46 void Location::Write(bool display_filename, bool display_function_name,
  47                      std::string* output) const {
  48   base::StringAppendF(output, "%s[%d] ",
  49       display_filename ? file_name_ : "line",
  50       line_number_);
  51
  52   if (display_function_name) {
  53     WriteFunctionName(output);
  54     output->push_back(' ');
  55   }
  56 }
  57
  58 void Location::WriteFunctionName(std::string* output) const {
  59   // Translate "<" to "&lt;" for HTML safety.
  60   // TODO(jar): Support ASCII or html for logging in ASCII.
  61   for (const char *p = function_name_; *p; p++) {
  62     switch (*p) {
  63       case '<':
  64         output->append("&lt;");
  65         break;
  66
  67       case '>':
  68         output->append("&gt;");
  69         break;
  70
  71       default:
  72         output->push_back(*p);
  73         break;
  74     }
  75   }
  76 }
  77
  78 //------------------------------------------------------------------------------
  79 LocationSnapshot::LocationSnapshot() : line_number(-1) {
  80 }
  81
  82 LocationSnapshot::LocationSnapshot(
  83     const tracked_objects::Location& location)
  84     : file_name(location.file_name()),
  85       function_name(location.function_name()),
  86       line_number(location.line_number()) {
  87 }
  88
  89 LocationSnapshot::~LocationSnapshot() {
  90 }
  91
  92 //------------------------------------------------------------------------------
  93 #if defined(COMPILER_MSVC)
  94 __declspec(noinline)
  95 #endif
  96 BASE_EXPORT const void* GetProgramCounter() {
  97 #if defined(COMPILER_MSVC)
  98   return _ReturnAddress();
  99 #elif defined(COMPILER_GCC) && !defined(OS_NACL)
 100   return __builtin_extract_return_addr(__builtin_return_address(0));
 101 #else
 102   return NULL;
 103 #endif
 104 }
 105
 106 }  // namespace tracked_objects