[compiler-rt] [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 llvm-commits]

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@@ -92,6 +92,19 @@ INSTR_PROF_DATA(const uint16_t, Int16ArrayTy, NumValueSites[IPVK_Last+1], \
 /* INSTR_PROF_DATA end. */
 
 
+#ifndef INSTR_PROF_VTABLE_DATA
+#define INSTR_PROF_VTABLE_DATA(Type, LLVMType, Name, Initializer)
+#else
+#define INSTR_PROF_VTABLE_DATA_DEFINED
+#endif
+INSTR_PROF_VTABLE_DATA(const uint64_t, llvm::Type::getInt64Ty(Ctx), VTableNameHash, \
+                      ConstantInt::get(llvm::Type::getInt64Ty(Ctx), IndexedInstrProf::ComputeHash(VTableName)))
+INSTR_PROF_VTABLE_DATA(const IntPtrT, llvm::Type::getInt8PtrTy(Ctx), VTablePointer, VTableAddr)
+INSTR_PROF_VTABLE_DATA(const uint32_t, llvm::Type::getInt32Ty(Ctx), VTableSize, \
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minglotus-6 wrote:

yes, recording the beginning and end of the vtable addresses helps mapping instrumented addresses (which is in the middle more accurately)

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