static void emit_return(Node *node) {
SAVE;
if (node->retval) {
emit_expr(node->retval);
maybe_booleanize_retval(node->retval->ctype);
}
emit_ret();
}
static void emit_func_call(Node *node) {
SAVE;
int opos = stackpos;
bool isptr = (node->type == AST_FUNCPTR_CALL);
Ctype *ftype = isptr ? node->fptr->ctype->ptr : node->ftype;
List *ints = make_list();
List *floats = make_list();
List *rest = make_list();
classify_args(ints, floats, rest, node->args);
save_arg_regs(list_len(ints), list_len(floats));
bool padding = stackpos % 16;
if (padding) {
emit("sub $8, %%rsp");
stackpos += 8;
}
emit_args(list_reverse(rest));
if (isptr) {
emit_expr(node->fptr);
push("rax");
}
emit_args(ints);
emit_args(floats);
pop_float_args(list_len(floats));
pop_int_args(list_len(ints));
if (isptr) pop("r11");
if (ftype->hasva)
emit("mov $%d, %%eax", list_len(floats));
if (isptr)
emit("call *%%r11");
else
emit("call %s", node->fname);
maybe_booleanize_retval(node->ctype);
if (list_len(rest) > 0) {
emit("add $%d, %%rsp", list_len(rest) * 8);
stackpos -= list_len(rest) * 8;
}
if (padding) {
emit("add $8, %%rsp");
stackpos -= 8;
}
restore_arg_regs(list_len(ints), list_len(floats));
assert(opos == stackpos);
}
static void emit_func_call(Node *node) {
SAVE;
int opos = stackpos;
bool isptr = (node->kind == AST_FUNCPTR_CALL);
Type *ftype = isptr ? node->fptr->ty->ptr : node->ftype;
Vector *ints = make_vector();
Vector *floats = make_vector();
Vector *rest = make_vector();
classify_args(ints, floats, rest, node->args);
save_arg_regs(vec_len(ints), vec_len(floats));
bool padding = stackpos % 16;
if (padding) {
emit("sub $8, #rsp");
stackpos += 8;
}
int restsize = emit_args(vec_reverse(rest));
if (isptr) {
emit_expr(node->fptr);
push("rax");
}
emit_args(ints);
emit_args(floats);
pop_float_args(vec_len(floats));
pop_int_args(vec_len(ints));
if (isptr) pop("r11");
if (ftype->hasva)
emit("mov $%u, #eax", vec_len(floats));
if (isptr)
emit("call *#r11");
else
emit("call %s", node->fname);
maybe_booleanize_retval(node->ty);
if (restsize > 0) {
emit("add $%d, #rsp", restsize);
stackpos -= restsize;
}
if (padding) {
emit("add $8, #rsp");
stackpos -= 8;
}
restore_arg_regs(vec_len(ints), vec_len(floats));
assert(opos == stackpos);
}