add support for passing through sizeof & alignofs

1 files changed, 8 insertions, 0 deletions

diff --git a/codegen.c b/codegen.c
index 7acd2c9..b56a8b9 100644
--- a/codegen.c
+++ b/codegen.c
@@ -311,6 +311,14 @@ static void gen_addr(Node *node, int to_tmp) {
 // Generate code for a given node.
 static void gen_expr(Node *node, int to_tmp) {
   emit_line(node->tok);
+  if (opt_type_builtins && (node->is_sizeof || node->is_alignof)) {
+    decltmp(node->ty, to_tmp);
+    if (node->is_sizeof)  printnoln("\tt%d = sizeof ( ", to_tmp);
+    else                  printnoln("\tt%d = alignof ( ", to_tmp);
+    print_type(node->is_sizeof);
+    println(" ) ;");
+    return;
+  }
   switch (node->kind) {
   case ND_NULL_EXPR:
     return;