[llvm] 5e7ad63 - [FuzzMutate] Match the callee's and callsite's calling conventions. (#139100)

[via llvm-commits]

Author: Manuel Carrasco
Date: 2025-05-12T10:14:59-07:00
New Revision: 5e7ad630b09b1c1f7e666f2432ba027a0879981e

URL: https://github.com/llvm/llvm-project/commit/5e7ad630b09b1c1f7e666f2432ba027a0879981e
DIFF: https://github.com/llvm/llvm-project/commit/5e7ad630b09b1c1f7e666f2432ba027a0879981e.diff

LOG: [FuzzMutate] Match the callee's and callsite's calling conventions. (#139100)

The mutator can generate calls with undefined behavior because it is not
matching the calling conventions.

Added: 
    

Modified: 
    llvm/lib/FuzzMutate/IRMutator.cpp

Removed: 
    


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diff  --git a/llvm/lib/FuzzMutate/IRMutator.cpp b/llvm/lib/FuzzMutate/IRMutator.cpp
index d5535ee9aaf66..672c666d4e052 100644
--- a/llvm/lib/FuzzMutate/IRMutator.cpp
+++ b/llvm/lib/FuzzMutate/IRMutator.cpp
@@ -391,6 +391,7 @@ void InsertFunctionStrategy::mutate(BasicBlock &BB, RandomIRBuilder &IB) {
                                          BasicBlock::iterator InsertPt) {
     StringRef Name = isRetVoid ? nullptr : "C";
     CallInst *Call = CallInst::Create(FTy, F, Srcs, Name, InsertPt);
+    Call->setCallingConv(F->getCallingConv());
     // Don't return this call inst if it return void as it can't be sinked.
     return isRetVoid ? nullptr : Call;
   };