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

third_party/tcmalloc/chromium/src/gperftools/type_profiler_map.h

Index: third_party/tcmalloc/chromium/src/gperftools/type_profiler_map.h
diff --git a/third_party/tcmalloc/chromium/src/gperftools/type_profiler_map.h b/third_party/tcmalloc/chromium/src/gperftools/type_profiler_map.h
new file mode 100644
index 0000000000000000000000000000000000000000..f5b0946998714ea973843def98408ba349f0d61b
--- /dev/null
+++ b/third_party/tcmalloc/chromium/src/gperftools/type_profiler_map.h
@@ -0,0 +1,22 @@
+// 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.
+
+#ifndef TYPE_PROFILER_MAP_H_
+#define TYPE_PROFILER_MAP_H_
+
+#include <typeinfo>
+
+// We don't use PERFTOOLS_DLL_DECL since TypeProfilerMap works only on Linux.
+
+namespace base {
+namespace type_profiler {
+
+void InsertType(void* address, unsigned int size, const std::type_info& type);

[Ryan Sleevi, 2012/09/13 09:13:25]

BUG: Your interposed __op_delete_intercept__ function takes its parameters as a
size_t ( see
http://codereview.chromium.org/10411047/diff/133036/base/allocator/type_profi...
)

You're potentially downcasting here to an unsigned int here. On an LP64 system,
you're converting a 64-bit size to a 32-bit size.

While I doubt we'll be allocating more than 4 gigs in a Chromium process any
time soon (well, unless it's a gmail tab...), I think you should try to maintain
accuracy here with relation to your types.

If you are going to shear off 32 bits, please make this explicit in every call,
as this will be a subtlety that will affect every developer who has to
read/maintain this code (which is why just using size_t is likely better)

[Dai Mikurube (NOT FULLTIME), 2012/09/13 10:45:05]

Good catch.  Switched to size_t.

+void EraseType(void* address);
+const std::type_info* LookupType(const void* address);
+
+}  // namespace type_profiler
+}  // namespace base
+
+#endif  // TYPE_PROFILER_MAP_H_