================
@@ -218,6 +221,64 @@ Value
*CodeGenFunction::EmitWebAssemblyBuiltinExpr(unsigned BuiltinID,
Function *Callee = CGM.getIntrinsic(Intrinsic::wasm_ref_null_func);
return Builder.CreateCall(Callee);
}
+ case WebAssembly::BI__builtin_wasm_test_function_pointer_signature: {
+ Value *FuncRef = EmitScalarExpr(E->getArg(0));
+
+ // Get the function type from the argument's static type
+ QualType ArgType = E->getArg(0)->getType();
+ const PointerType *PtrTy = ArgType->getAs<PointerType>();
+ assert(PtrTy && "Sema should have ensured this is a function pointer");
+
+ const FunctionType *FuncTy =
PtrTy->getPointeeType()->getAs<FunctionType>();
+ assert(FuncTy && "Sema should have ensured this is a function pointer");
+
+ // In the llvm IR, we won't have access any more to the type of the
function
+ // pointer so we need to insert this type information somehow. The
+ // @llvm.wasm.ref.test.func takes varargs arguments whose values are unused
+ // to indicate the type of the function to test for. See the test here:
+ // llvm/test/CodeGen/WebAssembly/ref-test-func.ll
+ //
+ // The format is: first we include the return types (since this is a C
+ // function pointer, there will be 0 or one of these) then a token type to
+ // indicate the boundary between return types and param types, then the
+ // param types.
+
+ llvm::FunctionType *LLVMFuncTy =
+ cast<llvm::FunctionType>(ConvertType(QualType(FuncTy, 0)));
+
+ uint NParams = LLVMFuncTy->getNumParams();
+ std::vector<Value *> Args;
----------------
hoodmane wrote:
I just leave all this to clang-format...
https://github.com/llvm/llvm-project/pull/150201
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