stage1 完成ast 定义sema

stage1/spl_sema.h

@@ -0,0 +1,33 @@
+#ifndef __SPL_SEMA_H__
+#define __SPL_SEMA_H__
+
+#include "spl_ast.h"
+#include "spl_type.h"
+
+typedef usize spl_scope_id_t; /* 0 is error */
+typedef struct {
+    spl_scope_id_t parent;
+    MAP(const char *, spl_type_id_t) symbols;
+} spl_scope_node_t;
+typedef VEC(spl_scope_node_t) spl_scope_node_vec_t;
+
+typedef struct {
+    spl_ast_t *ast;
+    spl_type_t type;
+    spl_scope_node_vec_t scopes;
+    spl_scope_id_t root_scope;
+    spl_scope_id_t current_scope;
+    int error_count;
+} spl_sema_t;
+
+void spl_sema_init(spl_sema_t *sema);
+void spl_sema_drop(spl_sema_t *sema);
+void spl_sema_run(spl_sema_t *sema);
+
+spl_scope_id_t spl_sema_scope_alloc(spl_sema_t *sema);
+bool spl_sema_scope_insert(spl_sema_t *sema, spl_scope_id_t id, const char *symbol_name,
+                           spl_type_id_t symbol_val);
+typedef VEC(const char *) spl_symbol_path_t;
+spl_type_id_t spl_sema_scope_find(spl_sema_t *sema, spl_symbol_path_t path);
+
+#endif /* __SPL_SEMA_H__ */