Type profiler by intercepting 'new' and 'delete' expressions.

base/allocator/type_profiler.cc

+// Copyright 2012 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.
+
+#if defined(TYPE_PROFILING)
+
+#include "base/allocator/type_profiler.h"
+
+#include <assert.h>
+
+namespace {
+
+void* NopIntercept(void* ptr, size_t size, const std::type_info& type) {
+  return ptr;
+}
+
+base::type_profiler::InterceptFunction* g_new_intercept = NopIntercept;
+base::type_profiler::InterceptFunction* g_delete_intercept = NopIntercept;
+
+}
+
+void* __op_new_intercept__(void* ptr,
+                           size_t size,
+                           const std::type_info& type) {
+  return g_new_intercept(ptr, size, type);
+}
+
+void* __op_delete_intercept__(void* ptr,
+                              size_t size,
+                              const std::type_info& type) {
+  return g_delete_intercept(ptr, size, type);
+}
+
+namespace base {
+namespace type_profiler {
+
+// static
+void InterceptFunctions::SetFunctions(InterceptFunction* new_intercept,
+                                      InterceptFunction* delete_intercept) {
+  // Don't use DCHECK, as this file is injected into targets
+  // that do not and should not depend on base/base.gyp:base
+  assert(g_new_intercept == NopIntercept);
+  assert(g_delete_intercept == NopIntercept);
+
+  g_new_intercept = new_intercept;
+  g_delete_intercept = delete_intercept;
+}
+
+// static
+void InterceptFunctions::ResetFunctions() {
+  g_new_intercept = NopIntercept;
+  g_delete_intercept = NopIntercept;
+}
+
+// static
+bool InterceptFunctions::IsAvailable() {
+  return g_new_intercept != NopIntercept || g_delete_intercept != NopIntercept;
+}
+
+}  // namespace type_profiler
+}  // namespace base
+
+#endif  // defined(TYPE_PROFILING)