stage1 重新实现ast2ir

stage1/spl_ast2ir.h

@@ -5,10 +5,22 @@
 #include "spl_sema.h"
 
 typedef MAP(spl_def_id_t, spl_ir_node_ref_t) spl_def2ir_map_t;
+
+typedef struct {
+    usize cont_blk;
+    usize brk_blk;
+    spl_ir_node_ref_vec_t breaks;
+} spl_loop_ctx_t;
+typedef VEC(spl_loop_ctx_t) spl_loop_ctx_vec_t;
+
+typedef VEC(spl_ast_node_ref_t) spl_defer_stack_t;
+
 typedef struct {
     const spl_sema_t *sema;
     spl_ir_builder_t *ir;
     spl_def2ir_map_t def2ir_map;
+    spl_loop_ctx_vec_t loop_stack;
+    spl_defer_stack_t defer_stack;
     int err_count;
 } spl_ast2ir_t;
 
@@ -17,4 +29,4 @@ void spl_ast2ir_drop(spl_ast2ir_t *ast2ir);
 
 void spl_ast2ir_run(spl_ast2ir_t *ast2ir);
 
-#endif /* __SPL_AST2IR_H__ */
+#endif /* __SPL_AST2IR_H__ */