From 74992929a79e2606fbc4d579c3fad04a890eda04 Mon Sep 17 00:00:00 2001 From: Thomas Munro Date: Wed, 10 Apr 2024 10:46:15 +1200 Subject: [PATCH] Fix illegal attribute propagation in LLVM JIT. Commit 72559438 started copying more attributes from AttributeTemplate to the functions we generate on the fly. In the case of deform functions, which return void, this meant that "noundef", from AttributeTemplate's return value (a Datum) was copied to a void type. Older LLVM releases were OK with that, but LLVM 18 crashes. Update our llvm_copy_attributes() function to skip copying the attribute for the return value, if the target function returns void. Thanks to Dmitry Dolgov for help chasing this down. Back-patch to all supported releases, like 72559438. Reported-by: Pavel Stehule Reviewed-by: Dmitry Dolgov <9erthalion6@gmail.com> Discussion: https://postgr.es/m/CAFj8pRACpVFr7LMdVYENUkScG5FCYMZDDdSGNU-tch%2Bw98OxYg%40mail.gmail.com --- src/backend/jit/llvm/llvmjit.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/src/backend/jit/llvm/llvmjit.c b/src/backend/jit/llvm/llvmjit.c index a4b9ede1f6..8b00d98112 100644 --- a/src/backend/jit/llvm/llvmjit.c +++ b/src/backend/jit/llvm/llvmjit.c @@ -565,8 +565,11 @@ llvm_copy_attributes(LLVMValueRef v_from, LLVMValueRef v_to) /* copy function attributes */ llvm_copy_attributes_at_index(v_from, v_to, LLVMAttributeFunctionIndex); - /* and the return value attributes */ - llvm_copy_attributes_at_index(v_from, v_to, LLVMAttributeReturnIndex); + if (LLVMGetTypeKind(LLVMGetFunctionReturnType(v_to)) != LLVMVoidTypeKind) + { + /* and the return value attributes */ + llvm_copy_attributes_at_index(v_from, v_to, LLVMAttributeReturnIndex); + } /* and each function parameter's attribute */ param_count = LLVMCountParams(v_from);