fix(ast): 删掉ast结构

src/main.cpp

@@ -1,17 +1,12 @@
 #include <exception>
-#include <fstream>
 #include <iostream>
-#include <stdexcept>
 
 #include "frontend/AntlrDriver.h"
-#include "frontend/AstBuilder.h"
 #include "ir/IR.h"
 #include "irgen/IRGen.h"
 #include "mir/MIR.h"
-#include "sem/Sema.h"
 #include "utils/CLI.h"
 #include "utils/Log.h"
-#include "ast/AstNodes.h"
 
 int main(int argc, char** argv) {
   try {
@@ -20,25 +15,15 @@ int main(int argc, char** argv) {
       PrintHelp(std::cout);
       return 0;
     }
+
     auto antlr = ParseFileWithAntlr(opts.input);
-    auto ast = BuildAst(antlr.tree);
     bool need_blank_line = false;
-    if (opts.emit_ast) {
-      ast::PrintAST(*ast);  // 调试 AST
+    if (opts.emit_parse_tree) {
+      std::cout << antlr.tree->toStringTree(antlr.parser.get()) << "\n";
       need_blank_line = true;
     }
-    if (!opts.ast_dot_output.empty()) {
-      std::ofstream dot_out(opts.ast_dot_output);
-      if (!dot_out) {
-        throw std::runtime_error("无法写入 AST DOT 文件: " + opts.ast_dot_output);
-      }
-      ast::PrintASTDot(*ast, dot_out);
-    }
-    ast = RunSema(std::move(ast));
-    // IR 生成：当前使用 IRGenDriver.cpp 里的最小实现，
-    // 同学们可以在 irgen/ 目录下按提示自行完善或替换实现。
-    auto module = GenerateIR(*ast);
 
+    auto module = GenerateIR(antlr.tree);
     if (opts.emit_ir) {
       ir::IRPrinter printer;
       if (need_blank_line) {