init basic

ccompiler/frontend/parser/ast/block.c

@@ -0,0 +1,50 @@
+
+#include "../parser.h"
+#include "ast.h"
+#include "../symtab/symtab.h"
+
+#ifndef BLOCK_MAX_NODE
+#define BLOCK_MAX_NODE (1024)
+#endif
+
+struct ASTNode* parse_block(struct Parser* parser) {
+    symtab_enter_scope(parser->symtab);
+
+    // parse_decl(parser); // decl_var
+    enum TokenType ttype;
+    struct ASTNode* node = new_ast_node();
+    node->type = NT_BLOCK;
+    flushpeektok(parser);
+    ttype = peektoktype(parser);
+    if (ttype != TOKEN_L_BRACE) {
+        error("block need '{' start");
+    }
+    poptok(parser);
+
+    node->block.children = malloc(sizeof(struct ASTNode*) * BLOCK_MAX_NODE);
+    struct ASTNode* child = NULL;
+    while (1) {
+        if (peek_decl(parser) == 1) {
+            child = parse_decl(parser);
+            goto ADD_CHILD;
+        }
+
+        flushpeektok(parser);
+        ttype = peektoktype(parser);
+        switch (ttype) {
+        case TOKEN_R_BRACE:
+            poptok(parser);
+            goto END;
+        default:
+            child = parse_stmt(parser);
+            goto ADD_CHILD;
+            break;
+        }
+        continue;
+    ADD_CHILD:
+        node->block.children[node->block.child_size++] = child;
+    }
+END:
+    symtab_leave_scope(parser->symtab);
+    return node;
+}