fix(frontend): 修复部分实现

src/main.cpp

@@ -1,10 +1,13 @@
 #include <exception>
 #include <iostream>
+#include <stdexcept>
 
 #include "frontend/AntlrDriver.h"
+#include "frontend/SyntaxTreePrinter.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"
 
@@ -19,10 +22,16 @@ int main(int argc, char** argv) {
     auto antlr = ParseFileWithAntlr(opts.input);
     bool need_blank_line = false;
     if (opts.emit_parse_tree) {
-      std::cout << antlr.tree->toStringTree(antlr.parser.get()) << "\n";
+      PrintSyntaxTree(antlr.tree, antlr.parser.get(), std::cout);
       need_blank_line = true;
     }
 
+    auto* comp_unit = dynamic_cast<SysYParser::CompUnitContext*>(antlr.tree);
+    if (!comp_unit) {
+      throw std::runtime_error("[main] 语法树根节点不是 compUnit");
+    }
+    RunSema(*comp_unit);
+
     auto module = GenerateIR(antlr.tree);
     if (opts.emit_ir) {
       ir::IRPrinter printer;