[llvm] [X86][KCFI] Do not require linux triple for kcfi-arity (PR #148207)
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Fri Jul 11 03:54:16 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-x86
Author: Nikita Popov (nikic)
<details>
<summary>Changes</summary>
This code doesn't assume the Linux ABI, but the standard x86-64 SysV ABI, which is used (with minor variations) by all non-Windows targets.
Requiring "linux" as the OS here is problematic, because the actual OS (as opposed to users of the OS) is generally compiled against the "none" target.
---
Full diff: https://github.com/llvm/llvm-project/pull/148207.diff
2 Files Affected:
- (modified) llvm/lib/Target/X86/X86AsmPrinter.cpp (+2-2)
- (modified) llvm/test/CodeGen/X86/kcfi-arity.ll (+1)
``````````diff
diff --git a/llvm/lib/Target/X86/X86AsmPrinter.cpp b/llvm/lib/Target/X86/X86AsmPrinter.cpp
index 50c20fcde49ce..d406277e440bb 100644
--- a/llvm/lib/Target/X86/X86AsmPrinter.cpp
+++ b/llvm/lib/Target/X86/X86AsmPrinter.cpp
@@ -192,9 +192,9 @@ void X86AsmPrinter::emitKCFITypeId(const MachineFunction &MF) {
unsigned DestReg = X86::EAX;
if (F.getParent()->getModuleFlag("kcfi-arity")) {
- // The ArityToRegMap assumes the 64-bit Linux kernel ABI
+ // The ArityToRegMap assumes the 64-bit SysV ABI.
[[maybe_unused]] const auto &Triple = MF.getTarget().getTargetTriple();
- assert(Triple.isArch64Bit() && Triple.isOSLinux());
+ assert(Triple.isArch64Bit() && !Triple.isOSWindows());
// Determine the function's arity (i.e., the number of arguments) at the ABI
// level by counting the number of parameters that are passed
diff --git a/llvm/test/CodeGen/X86/kcfi-arity.ll b/llvm/test/CodeGen/X86/kcfi-arity.ll
index 009fa7d2dc0a4..5a19bcd7835ea 100644
--- a/llvm/test/CodeGen/X86/kcfi-arity.ll
+++ b/llvm/test/CodeGen/X86/kcfi-arity.ll
@@ -1,4 +1,5 @@
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -verify-machineinstrs < %s | FileCheck %s --check-prefix=ASM
+; RUN: llc -mtriple=x86_64-unknown-none -verify-machineinstrs < %s | FileCheck %s --check-prefix=ASM
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -verify-machineinstrs -stop-after=finalize-isel < %s | FileCheck %s --check-prefixes=MIR,ISEL
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -verify-machineinstrs -stop-after=kcfi < %s | FileCheck %s --check-prefixes=MIR,KCFI
``````````
</details>
https://github.com/llvm/llvm-project/pull/148207
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