michael@0: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "build/build_config.h"
michael@0: 
michael@0: #if defined(COMPILER_MSVC)
michael@0: // MSDN says to #include <intrin.h>, but that breaks the VS2005 build.
michael@0: extern "C" {
michael@0:   void* _ReturnAddress();
michael@0: }
michael@0: #endif
michael@0: 
michael@0: #include "base/location.h"
michael@0: #include "base/strings/string_number_conversions.h"
michael@0: #include "base/strings/stringprintf.h"
michael@0: 
michael@0: namespace tracked_objects {
michael@0: 
michael@0: Location::Location(const char* function_name,
michael@0:                    const char* file_name,
michael@0:                    int line_number,
michael@0:                    const void* program_counter)
michael@0:     : function_name_(function_name),
michael@0:       file_name_(file_name),
michael@0:       line_number_(line_number),
michael@0:       program_counter_(program_counter) {
michael@0: }
michael@0: 
michael@0: Location::Location()
michael@0:     : function_name_("Unknown"),
michael@0:       file_name_("Unknown"),
michael@0:       line_number_(-1),
michael@0:       program_counter_(NULL) {
michael@0: }
michael@0: 
michael@0: std::string Location::ToString() const {
michael@0:   return std::string(function_name_) + "@" + file_name_ + ":" +
michael@0:       base::IntToString(line_number_);
michael@0: }
michael@0: 
michael@0: void Location::Write(bool display_filename, bool display_function_name,
michael@0:                      std::string* output) const {
michael@0:   base::StringAppendF(output, "%s[%d] ",
michael@0:       display_filename ? file_name_ : "line",
michael@0:       line_number_);
michael@0: 
michael@0:   if (display_function_name) {
michael@0:     WriteFunctionName(output);
michael@0:     output->push_back(' ');
michael@0:   }
michael@0: }
michael@0: 
michael@0: void Location::WriteFunctionName(std::string* output) const {
michael@0:   // Translate "<" to "&lt;" for HTML safety.
michael@0:   // TODO(jar): Support ASCII or html for logging in ASCII.
michael@0:   for (const char *p = function_name_; *p; p++) {
michael@0:     switch (*p) {
michael@0:       case '<':
michael@0:         output->append("&lt;");
michael@0:         break;
michael@0: 
michael@0:       case '>':
michael@0:         output->append("&gt;");
michael@0:         break;
michael@0: 
michael@0:       default:
michael@0:         output->push_back(*p);
michael@0:         break;
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: //------------------------------------------------------------------------------
michael@0: LocationSnapshot::LocationSnapshot() : line_number(-1) {
michael@0: }
michael@0: 
michael@0: LocationSnapshot::LocationSnapshot(
michael@0:     const tracked_objects::Location& location)
michael@0:     : file_name(location.file_name()),
michael@0:       function_name(location.function_name()),
michael@0:       line_number(location.line_number()) {
michael@0: }
michael@0: 
michael@0: LocationSnapshot::~LocationSnapshot() {
michael@0: }
michael@0: 
michael@0: //------------------------------------------------------------------------------
michael@0: #if defined(COMPILER_MSVC)
michael@0: __declspec(noinline)
michael@0: #endif
michael@0: BASE_EXPORT const void* GetProgramCounter() {
michael@0: #if defined(COMPILER_MSVC)
michael@0:   return _ReturnAddress();
michael@0: #elif defined(COMPILER_GCC)
michael@0:   return __builtin_extract_return_addr(__builtin_return_address(0));
michael@0: #endif  // COMPILER_GCC
michael@0: 
michael@0:   return NULL;
michael@0: }
michael@0: 
michael@0: }  // namespace tracked_objects