From da68aacaa08db4154fecc1c85379b3eb59c9f9a2 Mon Sep 17 00:00:00 2001
From: i22007 <d.gosse2@gmx.de>
Date: Tue, 7 May 2024 19:13:40 +0200
Subject: [PATCH] Generate byteode for empty class without typecheck

---
 pom.xml                                       | 12 +++++++
 src/main/java/bytecode/ByteCodeGenerator.java | 33 +++++++++++++++++++
 src/main/java/parser/Main.java                |  3 ++
 3 files changed, 48 insertions(+)
 create mode 100644 src/main/java/bytecode/ByteCodeGenerator.java

diff --git a/pom.xml b/pom.xml
index f1dc834..9ee63e3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,6 +22,18 @@
             <version>5.9.3</version> <!-- Change the version as needed -->
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.antlr</groupId>
+            <artifactId>antlr4-runtime</artifactId>
+            <version>4.13.1</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.ow2.asm</groupId>
+            <artifactId>asm</artifactId>
+            <version>9.7</version>
+        </dependency>
+
     </dependencies>
 
     <build>
diff --git a/src/main/java/bytecode/ByteCodeGenerator.java b/src/main/java/bytecode/ByteCodeGenerator.java
new file mode 100644
index 0000000..8b07bbb
--- /dev/null
+++ b/src/main/java/bytecode/ByteCodeGenerator.java
@@ -0,0 +1,33 @@
+package bytecode;
+
+import java.io.FileOutputStream;
+import java.io.IOException;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.Opcodes;
+import parser.ClassDeclarationNode;
+import parser.ProgramNode;
+
+public class ByteCodeGenerator {
+
+  public void generateByteCode(ProgramNode ast) {
+    for (ClassDeclarationNode classDeclarationNode : ast.classes) {
+      ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
+      cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC, classDeclarationNode.identifier, null,
+          "java/lang/Object", null);
+      cw.visitEnd();
+      printIntoClassFile(cw.toByteArray(), classDeclarationNode.identifier);
+    }
+  }
+
+  private void printIntoClassFile(byte[] byteCode, String name) {
+    String filePath = name + ".class";
+
+    try {
+      FileOutputStream fileOutputStream = new FileOutputStream(filePath);
+      fileOutputStream.write(byteCode);
+      fileOutputStream.close();
+    } catch (IOException e) {
+      e.printStackTrace();
+    }
+  }
+}
diff --git a/src/main/java/parser/Main.java b/src/main/java/parser/Main.java
index ca8554f..64a1c8b 100644
--- a/src/main/java/parser/Main.java
+++ b/src/main/java/parser/Main.java
@@ -23,5 +23,8 @@ public class Main {
         // Optionally print or process the AST
         System.out.println("Parsed " + ast.classes.size() + " classes.");
         System.out.println(ast.classes.get(0).identifier);
+
+        //ByteCodeGenerator byteCodeGenerator = new ByteCodeGenerator();
+        //byteCodeGenerator.generateByteCode(ast);
     }
 }
\ No newline at end of file