================
@@ -181,8 +181,26 @@ void X86AsmPrinter::emitKCFITypeId(const MachineFunction
&MF) {
// Embed the type hash in the X86::MOV32ri instruction to avoid special
// casing object file parsers.
EmitKCFITypePadding(MF);
+
+ Register MovReg = X86::EAX;
+ const auto &Triple = MF.getTarget().getTargetTriple();
+ if (Triple.isArch64Bit() && Triple.isOSLinux()) {
+ // Determine the function's arity (i.e., the number of arguments) at the
ABI
+ // level by counting the number of parameters that are passed
+ // as registers, such as pointers and 64-bit (or smaller) integers. The
+ // Linux x86-64 ABI allows up to 6 parameters to be passed in GPRs.
+ // Additional parameters or parameters larger than 64 bits may be passed on
+ // the stack, in which case the arity is denoted as 7.
+ const unsigned ArityToRegMap[8] = {X86::EAX, X86::ECX, X86::EDX, X86::EBX,
+ X86::ESP, X86::EBP, X86::ESI, X86::EDI};
----------------
phoebewang wrote:
Astonished ESP can be used to pass the hash.
https://github.com/llvm/llvm-project/pull/121070
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