Delete Tracked, and move Location to its own file.

base/location.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "build/build_config.h"
+
+#if defined(COMPILER_MSVC)
+// MSDN says to #include <intrin.h>, but that breaks the VS2005 build.
+extern "C" {
+  void* _ReturnAddress();
+}
+#endif
+
+#include "base/location.h"
+#include "base/string_number_conversions.h"
+#include "base/stringprintf.h"
+
+namespace tracked_objects {
+
+Location::Location(const char* function_name,
+                   const char* file_name,
+                   int line_number,
+                   const void* program_counter)
+    : function_name_(function_name),
+      file_name_(file_name),
+      line_number_(line_number),
+      program_counter_(program_counter) {
+}
+
+Location::Location()
+    : function_name_("Unknown"),
+      file_name_("Unknown"),
+      line_number_(-1),
+      program_counter_(NULL) {
+}
+
+std::string Location::ToString() const {
+  return std::string(function_name_) + "@" + file_name_ + ":" +
+      base::IntToString(line_number_);
+}
+
+void Location::Write(bool display_filename, bool display_function_name,
+                     std::string* output) const {
+  base::StringAppendF(output, "%s[%d] ",
+      display_filename ? file_name_ : "line",
+      line_number_);
+
+  if (display_function_name) {
+    WriteFunctionName(output);
+    output->push_back(' ');
+  }
+}
+
+void Location::WriteFunctionName(std::string* output) const {
+  // Translate "<" to "&lt;" for HTML safety.
+  // TODO(jar): Support ASCII or html for logging in ASCII.
+  for (const char *p = function_name_; *p; p++) {
+    switch (*p) {
+      case '<':
+        output->append("&lt;");
+        break;
+
+      case '>':
+        output->append("&gt;");
+        break;
+
+      default:
+        output->push_back(*p);
+        break;
+    }
+  }
+}
+
+#if defined(COMPILER_MSVC)
+__declspec(noinline)
+#endif
+BASE_EXPORT const void* GetProgramCounter() {
+#if defined(COMPILER_MSVC)
+  return _ReturnAddress();
+#elif defined(COMPILER_GCC)
+  return __builtin_extract_return_addr(__builtin_return_address(0));
+#endif  // COMPILER_GCC
+
+  return NULL;
+}
+
+}  // namespace tracked_objects