chore: add sema checker source and reference pdf

doc/实验进度与测试方法.md

@@ -124,7 +124,7 @@ g++ -std=c++17 \
   -Isrc \
   -Ibuild-sema/generated/antlr4 \
   -Ithird_party/antlr4-runtime-4.13.2/runtime/src \
-  build-sema/sema_check.cpp \
+  tools/sema_check.cpp \
   build-sema/src/sem/libsem.a \
   build-sema/src/frontend/libfrontend.a \
   build-sema/src/utils/libutils.a \

tools/sema_check.cpp

@@ -0,0 +1,34 @@
+#include <exception>
+#include <iostream>
+#include <string>
+
+#include "frontend/AntlrDriver.h"
+#include "sem/Sema.h"
+#include "utils/Log.h"
+
+int main(int argc, char** argv) {
+  if (argc < 2) {
+    std::cerr << "usage: sema_check <input.sy> [more.sy...]\n";
+    return 2;
+  }
+
+  bool failed = false;
+  for (int i = 1; i < argc; ++i) {
+    const std::string path = argv[i];
+    try {
+      auto antlr = ParseFileWithAntlr(path);
+      auto* comp_unit = dynamic_cast<SysYParser::CompUnitContext*>(antlr.tree);
+      if (!comp_unit) {
+        throw std::runtime_error(FormatError("sema_check", "语法树根节点不是 compUnit"));
+      }
+      (void)RunSema(*comp_unit);
+      std::cout << "OK " << path << "\n";
+    } catch (const std::exception& ex) {
+      failed = true;
+      std::cout << "ERR " << path << "\n";
+      PrintException(std::cout, ex);
+    }
+  }
+
+  return failed ? 1 : 0;
+}