expose Function::getFunctionType to LLVM c api

Author: mikea

llvm/include/llvm-c/Core.h

@@ -3016,6 +3016,13 @@ LLVMValueRef LLVMGetFirstParam(LLVMValueRef Fn);
  */
 LLVMValueRef LLVMGetLastParam(LLVMValueRef Fn);
 
+/**
+ * Obtain function type.
+ *
+ * @see llvm::Function::getFunctionType()
+ */
+LLVMTypeRef LLVMGetFunctionType(LLVMValueRef Fn);
+
 /**
  * Obtain the next parameter to a function.
  *

llvm/lib/IR/Core.cpp

@@ -2658,6 +2658,10 @@ void LLVMSetParamAlignment(LLVMValueRef Arg, unsigned align) {
   A->addAttr(Attribute::getWithAlignment(A->getContext(), Align(align)));
 }
 
+LLVMTypeRef LLVMGetFunctionType(LLVMValueRef Fn) {
+  return wrap(unwrap<Function>(Fn)->getFunctionType());
+}
+
 /*--.. Operations on ifuncs ................................................--*/
 
 LLVMValueRef LLVMAddGlobalIFunc(LLVMModuleRef M,