utility class for dumping class files

1 files changed, 79 insertions, 0 deletions

diff --git a/bcel-builder/testsrc/Play.java b/bcel-builder/testsrc/Play.java
new file mode 100644
index 000000000..024ef7a6d
--- /dev/null
+++ b/bcel-builder/testsrc/Play.java
@@ -0,0 +1,79 @@
+import java.io.File;
+import java.io.FileInputStream;
+
+import org.aspectj.apache.bcel.classfile.Attribute;
+import org.aspectj.apache.bcel.classfile.ClassParser;
+import org.aspectj.apache.bcel.classfile.Field;
+import org.aspectj.apache.bcel.classfile.JavaClass;
+import org.aspectj.apache.bcel.classfile.Method;
+import org.aspectj.apache.bcel.classfile.Unknown;
+
+
+public class Play {
+	
+	public static void printBytes(byte[] bs) {
+		StringBuilder sb = new StringBuilder("Bytes:"+bs.length+"[");
+		for (int i=0;i<bs.length;i++) {
+			if (i>0) sb.append(" ");
+			sb.append(bs[i]);
+		}
+		sb.append("]");
+		System.out.println(sb);
+	}
+	
+	public static void main(String[] args) throws Exception {
+		if (args==null || args.length==0 ) {
+			System.out.println("Specify a file");
+			return;
+		}
+		if (!args[0].endsWith(".class")) {
+			args[0] = args[0]+".class";
+		}
+		FileInputStream fis = new FileInputStream(new File(args[0]));
+		ClassParser cp = new ClassParser(fis,args[0]);
+		JavaClass jc = cp.parse();
+		Attribute[] attributes = jc.getAttributes();
+		printUsefulAttributes(attributes);
+		System.out.println("Fields");
+		Field[] fs = jc.getFields();
+		if (fs!=null) {
+			for (Field f: fs) {
+				System.out.println(f);
+				printUsefulAttributes(f.getAttributes());
+			}
+		}
+		System.out.println("Methods");
+		Method[] ms = jc.getMethods();
+		if (ms!=null) {
+			for (Method m: ms) {
+				System.out.println(m);
+				printUsefulAttributes(m.getAttributes());
+				System.out.println("Code attributes:");
+				printUsefulAttributes(m.getCode().getAttributes());
+			}
+		}
+//		Method[] ms = jc.getMethods();
+//		for (Method m: ms) {
+//			System.out.println("==========");
+//			System.out.println("Method: "+m.getName()+" modifiers=0x"+Integer.toHexString(m.getModifiers()));
+//			Attribute[] as = m.getAttributes();
+//			for (Attribute a: as) {
+//				if (a.getName().toLowerCase().contains("synthetic")) {
+//					System.out.println("> "+a.getName());
+//				}
+//			}
+//		}
+	}
+
+	private static void printUsefulAttributes(Attribute[] attributes) {
+		for (Attribute attribute: attributes) {
+			String n = attribute.getName();
+			if (n.equals("RuntimeInvisibleTypeAnnotations") ||
+				n.equals("RuntimeVisibleTypeAnnotations")) {
+				Unknown unknown = (Unknown)attribute;
+				byte[] bs = unknown.getBytes();
+				printBytes(bs);
+			}
+		}
+	}
+}