feat(mir): 增加 Lab3 AArch64 MVP 后端与 --emit-asm 支持

src/main.cpp

@@ -7,6 +7,7 @@
 #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"
@@ -21,8 +22,10 @@ int main(int argc, char** argv) {
     }
     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
+      need_blank_line = true;
     }
     if (!opts.ast_dot_output.empty()) {
       std::ofstream dot_out(opts.ast_dot_output);
@@ -38,7 +41,21 @@ int main(int argc, char** argv) {
 
     if (opts.emit_ir) {
       ir::IRPrinter printer;
+      if (need_blank_line) {
+        std::cout << "\n";
+      }
       printer.Print(*module);
+      need_blank_line = true;
+    }
+
+    if (opts.emit_asm) {
+      auto machine_func = mir::LowerToMIR(*module);
+      mir::RunRegAlloc(*machine_func);
+      mir::RunFrameLowering(*machine_func);
+      if (need_blank_line) {
+        std::cout << "\n";
+      }
+      mir::PrintAsm(*machine_func, std::cout);
     }
   } catch (const std::exception& ex) {
     std::cerr << "error: " << ex.what() << "\n";