[clang] [IRPGO][ValueProfile] Instrument virtual table address that could be used to do virtual table address comparision for indirect-call-promotion. (PR #66825)

[Mingming Liu via cfe-commits]

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@@ -18,11 +18,16 @@
  * pointers to the live data in memory.  This function is probably not what you
  * want.  Use __llvm_profile_get_size_for_buffer instead.  Use this function if
  * your program has a custom memory layout.
+ * NOTE: The change of function signature requires modifying c source code
+ * as demonstrated by the existing tests. If this is causing backward
+ * compatible issues, considering adding another function for new use cases.
  */
 uint64_t __llvm_profile_get_size_for_buffer_internal(
     const __llvm_profile_data *DataBegin, const __llvm_profile_data *DataEnd,
     const char *CountersBegin, const char *CountersEnd, const char *NamesBegin,
-    const char *NamesEnd);
+    const char *NamesEnd, const VTableProfData *VTableBegin,
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minglotus-6 wrote:

IIUC, this function is used in `llvm-profdata merge` when converting from raw profiles to indexed profiles. I'll add some logs to double check.

https://github.com/llvm/llvm-project/pull/66825