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 std::string Location::ToString() const {
  35   return std::string(function_name_) + "@" + file_name_ + ":" +
  36       base::IntToString(line_number_);
  37 }
  38
  39 void Location::Write(bool display_filename, bool display_function_name,
  40                      std::string* output) const {
  41   base::StringAppendF(output, "%s[%d] ",
  42       display_filename ? file_name_ : "line",
  43       line_number_);
  44
  45   if (display_function_name) {
  46     WriteFunctionName(output);
  47     output->push_back(' ');
  48   }
  49 }
  50
  51 void Location::WriteFunctionName(std::string* output) const {
  52   // Translate "<" to "&lt;" for HTML safety.
  53   // TODO(jar): Support ASCII or html for logging in ASCII.
  54   for (const char *p = function_name_; *p; p++) {
  55     switch (*p) {
  56       case '<':
  57         output->append("&lt;");
  58         break;
  59
  60       case '>':
  61         output->append("&gt;");
  62         break;
  63
  64       default:
  65         output->push_back(*p);
  66         break;
  67     }
  68   }
  69 }
  70
  71 //------------------------------------------------------------------------------
  72 LocationSnapshot::LocationSnapshot() : line_number(-1) {
  73 }
  74
  75 LocationSnapshot::LocationSnapshot(
  76     const tracked_objects::Location& location)
  77     : file_name(location.file_name()),
  78       function_name(location.function_name()),
  79       line_number(location.line_number()) {
  80 }
  81
  82 LocationSnapshot::~LocationSnapshot() {
  83 }
  84
  85 //------------------------------------------------------------------------------
  86 #if defined(COMPILER_MSVC)
  87 __declspec(noinline)
  88 #endif
  89 BASE_EXPORT const void* GetProgramCounter() {
  90 #if defined(COMPILER_MSVC)
  91   return _ReturnAddress();
  92 #elif defined(COMPILER_GCC) && !defined(OS_NACL)
  93   return __builtin_extract_return_addr(__builtin_return_address(0));
  94 #else
  95   return NULL;
  96 #endif
  97 }
  98
  99 }  // namespace tracked_objects