fix(optimizer): destroy ast dead code

Co-authored-by: Copilot <[email protected]>

Author: BeyondMagic

src/ast.c

@@ -37,7 +37,7 @@ static void ensure_capacity(void **buffer, size_t elem_size, size_t *capacity, s
 }
 
 static void ast_expr_destroy(AstExpr *expr);
-static void ast_stmt_destroy(AstStmt *stmt);
+void ast_stmt_destroy(AstStmt *stmt);
 
 AstProgram *ast_program_create(void)
 {
@@ -229,7 +229,7 @@ void ast_stmt_list_destroy(AstStmtList *list)
 	list->capacity = 0;
 }
 
-static void ast_stmt_destroy(AstStmt *stmt)
+void ast_stmt_destroy(AstStmt *stmt)
 {
 	if (!stmt)
 	{

src/ast.h

@@ -223,6 +223,7 @@ void ast_expr_list_destroy(AstExprList *list);
 AstStmtList ast_stmt_list_make(void);
 void ast_stmt_list_push(AstStmtList *list, AstStmt *stmt);
 void ast_stmt_list_destroy(AstStmtList *list);
+void ast_stmt_destroy(AstStmt *stmt);
 
 AstBlock ast_block_from_list(AstStmtList *list);
 

src/optimizer.c

@@ -613,22 +613,26 @@ static char *expr_make_key(const AstExpr *expr)
 
 static void eliminate_unreachable(AstStmtList *list)
 {
-    if (!list) return;
-
-    int after_return = 0;
-    size_t write = 0;
-
-    for (size_t i = 0; i < list->count; i++) {
-        AstStmt *s = list->items[i];
-        if (after_return) {
-            continue;
-        }
-        list->items[write++] = s;
-        if (s->kind == STMT_RETURN) {
-            after_return = 1;
-        }
-    }
-
-    list->count = write;
-}
+	if (!list)
+		return;
+
+	int after_return = 0;
+	size_t write = 0;
 
+	for (size_t i = 0; i < list->count; i++)
+	{
+		AstStmt *s = list->items[i];
+		if (after_return)
+		{
+			ast_stmt_destroy(s);
+			continue;
+		}
+		list->items[write++] = s;
+		if (s->kind == STMT_RETURN)
+		{
+			after_return = 1;
+		}
+	}
+
+	list->count = write;
+}