Clean up how procedures are typed in LLVM's dumb type system

src/llvm_backend.cpp

@@ -739,11 +739,11 @@ lbProcedure *lb_create_startup_runtime(lbModule *main_module, lbProcedure *start
 	lb_begin_procedure_body(p);
 
 	if (startup_type_info) {
-		LLVMBuildCall2(p->builder, lb_type_internal_for_procedures_raw(main_module, startup_type_info->type), startup_type_info->value, nullptr, 0, "");
+		OdinLLVMBuildCall(p, {startup_type_info->value, startup_type_info->type}, nullptr, 0);
 	}
 
 	if (objc_names) {
-		LLVMBuildCall2(p->builder, lb_type_internal_for_procedures_raw(main_module, objc_names->type), objc_names->value, nullptr, 0, "");
+		OdinLLVMBuildCall(p, {objc_names->value, objc_names->type}, nullptr, 0);
 	}
 
 	for_array(i, global_variables) {

src/llvm_backend_general.cpp

@@ -861,39 +861,6 @@ void lb_const_store(lbValue ptr, lbValue value) {
 	LLVMSetInitializer(ptr.value, value.value);
 }
 
-
-bool lb_is_type_proc_recursive(Type *t) {
-	for (;;) {
-		if (t == nullptr) {
-			return false;
-		}
-		switch (t->kind) {
-		case Type_Named:
-			t = t->Named.base;
-			break;
-		case Type_Pointer:
-			t = t->Pointer.elem;
-			break;
-		case Type_Array:
-			t = t->Array.elem;
-			break;
-		case Type_EnumeratedArray:
-			t = t->EnumeratedArray.elem;
-			break;
-		case Type_Slice:
-			t = t->Slice.elem;
-			break;
-		case Type_DynamicArray:
-			t = t->DynamicArray.elem;
-			break;
-		case Type_Proc:
-			return true;
-		default:
-			return false;
-		}
-	}
-}
-
 void lb_emit_store(lbProcedure *p, lbValue ptr, lbValue value) {
 	GB_ASSERT(value.value != nullptr);
 	Type *a = type_deref(ptr.type);
@@ -953,7 +920,7 @@ void lb_emit_store(lbProcedure *p, lbValue ptr, lbValue value) {
 		}
 	}
 
-	if (lb_is_type_proc_recursive(a)) {
+	if (is_type_proc(a)) {
 		// NOTE(bill, 2020-11-11): Because of certain LLVM rules, a procedure value may be
 		// stored as regular pointer with no procedure information
 
@@ -1551,7 +1518,7 @@ LLVMTypeRef lb_type_internal_for_procedures_raw(lbModule *m, Type *type) {
 			if (e->flags & EntityFlag_ByPtr) {
 				param_type = lb_type(m, alloc_type_pointer(e_type));
 			} else if (is_type_boolean(e_type) &&
-			    type_size_of(e_type) <= 1) {
+			           type_size_of(e_type) <= 1) {
 				param_type = LLVMInt1TypeInContext(m->ctx);
 			} else {
 				if (is_type_proc(e_type)) {
@@ -2098,15 +2065,13 @@ LLVMTypeRef lb_type_internal(lbModule *m, Type *type) {
 		}
 
 	case Type_Proc:
-		// if (m->internal_type_level > 256) { // TODO HACK(bill): is this really enough?
-		if (m->internal_type_level > 1) { // TODO HACK(bill): is this really enough?
-			return LLVMPointerType(LLVMIntTypeInContext(m->ctx, 8), 0);
-		} else {
+		{
+			// NOTE(bill): we do an explicit cast to the correct procedure type when calling the procedure
 			LLVMTypeRef proc_raw_type = lb_type_internal_for_procedures_raw(m, type);
-			return LLVMPointerType(proc_raw_type, 0);
+			gb_unused(proc_raw_type);
+			return lb_type(m, t_rawptr);
 		}
 
-		break;
 	case Type_BitSet:
 		{
 			Type *ut = bit_set_to_int(type);

src/llvm_backend_proc.cpp

@@ -1,6 +1,11 @@
+LLVMValueRef OdinLLVMBuildCall(lbProcedure *p, lbValue const &value, LLVMValueRef *args, unsigned arg_count) {
+	GB_ASSERT(is_type_proc(value.type));
+	LLVMTypeRef type = lb_type_internal_for_procedures_raw(p->module, value.type);
+	LLVMValueRef func = LLVMBuildPointerCast(p->builder, value.value, LLVMPointerType(type, 0), "");
+	return LLVMBuildCall2(p->builder, type, func, args, arg_count, "");
+}
 
-LLVMValueRef lb_call_intrinsic(lbProcedure *p, const char *name, LLVMValueRef* args, unsigned arg_count, LLVMTypeRef* types, unsigned type_count)
-{
+LLVMValueRef lb_call_intrinsic(lbProcedure *p, const char *name, LLVMValueRef* args, unsigned arg_count, LLVMTypeRef* types, unsigned type_count) {
 	unsigned id = LLVMLookupIntrinsicID(name, gb_strlen(name));
 	GB_ASSERT_MSG(id != 0, "Unable to find %s", name);
 	LLVMValueRef ip = LLVMGetIntrinsicDeclaration(p->module->mod, id, types, type_count);
@@ -740,6 +745,11 @@ lbValue lb_emit_call_internal(lbProcedure *p, lbValue value, lbValue return_ptr,
 	}
 	for_array(i, processed_args) {
 		lbValue arg = processed_args[i];
+		if (is_type_proc(arg.type)) {
+			// NOTE(bill): all procedure types (function pointers) are typed as if they are `rawptr`
+			// and then the correct type is set at the call site
+			arg.value = LLVMBuildPointerCast(p->builder, arg.value, lb_type(p->module, arg.type), "");
+		}
 		args[arg_index++] = arg.value;
 	}
 	if (context_ptr.addr.value != nullptr) {
@@ -752,11 +762,7 @@ lbValue lb_emit_call_internal(lbProcedure *p, lbValue value, lbValue return_ptr,
 
 	{
 		LLVMTypeRef fnp = lb_type_internal_for_procedures_raw(p->module, value.type);
-		LLVMTypeRef ftp = LLVMPointerType(fnp, 0);
-		LLVMValueRef fn = value.value;
-		if (!lb_is_type_kind(LLVMTypeOf(value.value), LLVMFunctionTypeKind)) {
-			fn = LLVMBuildPointerCast(p->builder, fn, ftp, "");
-		}
+
 		GB_ASSERT_MSG(lb_is_type_kind(fnp, LLVMFunctionTypeKind), "%s", LLVMPrintTypeToString(fnp));
 
 		{
@@ -780,7 +786,7 @@ lbValue lb_emit_call_internal(lbProcedure *p, lbValue value, lbValue return_ptr,
 			}
 		}
 
-		LLVMValueRef ret = LLVMBuildCall2(p->builder, fnp, fn, args, arg_count, "");
+		LLVMValueRef ret = OdinLLVMBuildCall(p, value, args, arg_count);
 
 		if (return_ptr.value != nullptr) {
 			LLVMAddCallSiteAttribute(ret, 1, lb_create_enum_attribute_with_type(p->module->ctx, "sret", LLVMTypeOf(args[0])));