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      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/strings/string_number_conversions.h"
     16 #include "base/strings/stringprintf.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
    103