stage1 指针计算类型的错误修复 as运算符优先级的修改 ir2vm的bug修复

stage1/spl_ast.c

@@ -148,6 +148,7 @@ static spl_ast_node_ref_t parse_param_decl_impl(parser_t *p);
 static spl_ast_node_ref_t parse_var_pattern(parser_t *p);
 static spl_ast_node_ref_t parse_match_pattern(parser_t *p);
 
+static spl_ast_node_ref_t parse_cast(parser_t *p);
 static spl_ast_node_ref_t parse_prefix(parser_t *p);
 static spl_ast_node_ref_t parse_postfix(parser_t *p);
 static spl_ast_node_ref_t parse_primary(parser_t *p);
@@ -1215,7 +1216,7 @@ static spl_binary_op_t token_to_binary_op(spl_tok_type_t tt) {
 }
 
 static spl_ast_node_ref_t parse_expr_prec(parser_t *p, int min_prec) {
-    spl_ast_node_ref_t left = parse_prefix(p);
+    spl_ast_node_ref_t left = parse_cast(p);
     if (p->failed)
         return left;
 
@@ -1259,6 +1260,22 @@ static spl_ast_node_ref_t parse_expr(parser_t *p) {
     return parse_expr_prec(p, 1); // 最低优先级
 }
 
+static spl_ast_node_ref_t parse_cast(parser_t *p) {
+    spl_ast_node_ref_t expr = parse_prefix(p);
+    while (!p->failed) {
+        const spl_tok_t *t = peek(p);
+        if (!t || t->type != KW_AS || p->stop_as)
+            break;
+        advance(p);
+        spl_ast_node_ref_t type = parse_type_expr(p);
+        spl_ast_node_ref_t ref = new_node(p, SPL_AST_EXPR_CAST, t);
+        node_at(p->ast, ref)->cast.expr = expr;
+        node_at(p->ast, ref)->cast.type = type;
+        expr = ref;
+    }
+    return expr;
+}
+
 static spl_ast_node_ref_t parse_prefix(parser_t *p) {
     const spl_tok_t *t = peek(p);
     if (!t)
@@ -1393,13 +1410,6 @@ static spl_ast_node_ref_t parse_postfix(parser_t *p) {
                 node_at(p->ast, ref)->index.index = begin;
                 expr = ref;
             }
-        } else if (t->type == KW_AS && !p->stop_as) {
-            advance(p);
-            spl_ast_node_ref_t type = parse_type_expr(p);
-            spl_ast_node_ref_t ref = new_node(p, SPL_AST_EXPR_CAST, t);
-            node_at(p->ast, ref)->cast.expr = expr;
-            node_at(p->ast, ref)->cast.type = type;
-            expr = ref;
         } else {
             break;
         }