Author: ebourg
Date: Fri Feb 20 11:11:54 2015
New Revision: 1661091
URL: http://svn.apache.org/r1661091
Log:
Reformatted the examples
Modified:
commons/proper/bcel/trunk/src/examples/HelloWorldBuilder.java
commons/proper/bcel/trunk/src/examples/JasminVisitor.java
commons/proper/bcel/trunk/src/examples/Package.java
commons/proper/bcel/trunk/src/examples/Peephole.java
commons/proper/bcel/trunk/src/examples/ProxyCreator.java
commons/proper/bcel/trunk/src/examples/TransitiveHull.java
commons/proper/bcel/trunk/src/examples/helloify.java
commons/proper/bcel/trunk/src/examples/id.java
commons/proper/bcel/trunk/src/examples/listclass.java
commons/proper/bcel/trunk/src/examples/maxstack.java
commons/proper/bcel/trunk/src/examples/patchclass.java
Modified: commons/proper/bcel/trunk/src/examples/HelloWorldBuilder.java
URL:
http://svn.apache.org/viewvc/commons/proper/bcel/trunk/src/examples/HelloWorldBuilder.java?rev=1661091&r1=1661090&r2=1661091&view=diff
==============================================================================
--- commons/proper/bcel/trunk/src/examples/HelloWorldBuilder.java (original)
+++ commons/proper/bcel/trunk/src/examples/HelloWorldBuilder.java Fri Feb 20
11:11:54 2015
@@ -15,6 +15,9 @@
* limitations under the License.
*
*/
+
+import java.io.IOException;
+
import org.apache.bcel.Constants;
import org.apache.bcel.generic.ALOAD;
import org.apache.bcel.generic.ASTORE;
@@ -38,162 +41,143 @@ import org.apache.bcel.generic.Type;
* import java.io.*;
*
* public class HelloWorld {
- * public static void main(String[] argv) {
- * BufferedReader in = new BufferedReader(new
InputStreamReader(System.in));
- * String name = null;
+ * public static void main(String[] argv) {
+ * BufferedReader in = new BufferedReader(new
InputStreamReader(System.in));
+ * String name = null;
*
- * try {
- * System.out.print("Please enter your name> ");
- * name = in.readLine();
- * } catch(IOException e) {
- * System.out.println(e);
- * return;
- * }
+ * try {
+ * System.out.print("Please enter your name> ");
+ * name = in.readLine();
+ * } catch(IOException e) {
+ * System.out.println(e);
+ * return;
+ * }
*
- * System.out.println("Hello, " + name);
- * }
+ * System.out.println("Hello, " + name);
+ * }
* }
* </PRE>
*
- * @version $Id$
* @author <A HREF="mailto:[email protected]";>M. Dahm</A>
+ * @version $Id$
*/
public class HelloWorldBuilder {
- public static void main(String[] argv) {
- ClassGen cg = new ClassGen("HelloWorld", "java.lang.Object",
- "<generated>", Constants.ACC_PUBLIC |
- Constants.ACC_SUPER,
- null);
- ConstantPoolGen cp = cg.getConstantPool(); // cg creates constant pool
- InstructionList il = new InstructionList();
- MethodGen mg = new MethodGen(Constants.ACC_STATIC |
- Constants.ACC_PUBLIC,// access flags
- Type.VOID, // return type
- new Type[] { // argument types
- new ArrayType(Type.STRING, 1)
- },
- new String[] { "argv" }, // arg names
- "main", "HelloWorld", // method, class
- il, cp);
- InstructionFactory factory = new InstructionFactory(cg);
-
- ObjectType i_stream = new ObjectType("java.io.InputStream");
- ObjectType p_stream = new ObjectType("java.io.PrintStream");
-
- /* Create BufferedReader object and store it in local variable `in'.
- */
- il.append(factory.createNew("java.io.BufferedReader"));
- il.append(InstructionConstants.DUP); // Use predefined constant, i.e.
flyweight
- il.append(factory.createNew("java.io.InputStreamReader"));
- il.append(InstructionConstants.DUP);
- il.append(factory.createFieldAccess("java.lang.System", "in", i_stream,
- Constants.GETSTATIC));
-
- /* Call constructors, i.e. BufferedReader(InputStreamReader())
- */
- il.append(factory.createInvoke("java.io.InputStreamReader", "<init>",
- Type.VOID, new Type[] { i_stream },
- Constants.INVOKESPECIAL));
- il.append(factory.createInvoke("java.io.BufferedReader", "<init>",
Type.VOID,
- new Type[] { new ObjectType("java.io.Reader") },
- Constants.INVOKESPECIAL));
-
- /* Create local variable `in'
- */
- LocalVariableGen lg = mg.addLocalVariable("in",
- new ObjectType("java.io.BufferedReader"),
- null, null);
- int in = lg.getIndex();
- lg.setStart(il.append(new ASTORE(in))); // `i' valid from here
-
- /* Create local variable `name'
- */
- lg = mg.addLocalVariable("name", Type.STRING, null, null);
- int name = lg.getIndex();
- il.append(InstructionConstants.ACONST_NULL);
- lg.setStart(il.append(new ASTORE(name))); // `name' valid from here
-
- /* try { ...
- */
- InstructionHandle try_start =
- il.append(factory.createFieldAccess("java.lang.System", "out", p_stream,
- Constants.GETSTATIC));
-
- il.append(new PUSH(cp, "Please enter your name> "));
- il.append(factory.createInvoke("java.io.PrintStream", "print", Type.VOID,
- new Type[] { Type.STRING }, Constants.INVOKEVIRTUAL));
- il.append(new ALOAD(in));
- il.append(factory.createInvoke("java.io.BufferedReader", "readLine",
- Type.STRING, Type.NO_ARGS, Constants.INVOKEVIRTUAL));
- il.append(new ASTORE(name));
-
- /* Upon normal execution we jump behind exception handler,
- * the target address is not known yet.
- */
- GOTO g = new GOTO(null);
- InstructionHandle try_end = il.append(g);
-
- /* } catch() { ... }
- * Add exception handler: print exception and return from method
- */
- InstructionHandle handler =
- il.append(factory.createFieldAccess("java.lang.System", "out", p_stream,
- Constants.GETSTATIC));
- // Little trick in order not to save exception object temporarily
- il.append(InstructionConstants.SWAP);
-
- il.append(factory.createInvoke("java.io.PrintStream", "println",
Type.VOID,
- new Type[] { Type.OBJECT }, Constants.INVOKEVIRTUAL));
- il.append(InstructionConstants.RETURN);
- mg.addExceptionHandler(try_start, try_end, handler,
- new ObjectType("java.io.IOException"));
-
- /* Normal code continues, now we can set the branch target of the GOTO
- * that jumps over the handler code.
- */
- InstructionHandle ih =
- il.append(factory.createFieldAccess("java.lang.System", "out", p_stream,
- Constants.GETSTATIC));
- g.setTarget(ih);
-
- /* String concatenation compiles to StringBuffer operations.
- */
- il.append(factory.createNew(Type.STRINGBUFFER));
- il.append(InstructionConstants.DUP);
- il.append(new PUSH(cp, "Hello, "));
- il.append(factory.createInvoke("java.lang.StringBuffer", "<init>",
- Type.VOID, new Type[] { Type.STRING },
- Constants.INVOKESPECIAL));
- il.append(new ALOAD(name));
-
- /* Concatenate strings using a StringBuffer and print them.
- */
- il.append(factory.createInvoke("java.lang.StringBuffer", "append",
- Type.STRINGBUFFER, new Type[] { Type.STRING },
- Constants.INVOKEVIRTUAL));
- il.append(factory.createInvoke("java.lang.StringBuffer", "toString",
- Type.STRING, Type.NO_ARGS,
- Constants.INVOKEVIRTUAL));
+ public static void main(String[] argv) {
+ ClassGen cg = new ClassGen("HelloWorld", "java.lang.Object",
+ "<generated>", Constants.ACC_PUBLIC |
+ Constants.ACC_SUPER,
+ null);
+ ConstantPoolGen cp = cg.getConstantPool(); // cg creates constant pool
+ InstructionList il = new InstructionList();
+ MethodGen mg = new MethodGen(Constants.ACC_STATIC |
+ Constants.ACC_PUBLIC,// access flags
+ Type.VOID, // return type
+ new Type[]{ // argument types
+ new ArrayType(Type.STRING, 1)
+ },
+ new String[]{"argv"}, // arg names
+ "main", "HelloWorld", // method, class
+ il, cp);
+ InstructionFactory factory = new InstructionFactory(cg);
+
+ ObjectType i_stream = new ObjectType("java.io.InputStream");
+ ObjectType p_stream = new ObjectType("java.io.PrintStream");
+
+ // Create BufferedReader object and store it in local variable `in'.
+ il.append(factory.createNew("java.io.BufferedReader"));
+ il.append(InstructionConstants.DUP); // Use predefined constant, i.e.
flyweight
+ il.append(factory.createNew("java.io.InputStreamReader"));
+ il.append(InstructionConstants.DUP);
+ il.append(factory.createFieldAccess("java.lang.System", "in",
i_stream, Constants.GETSTATIC));
+
+ // Call constructors, i.e. BufferedReader(InputStreamReader())
+ il.append(factory.createInvoke("java.io.InputStreamReader", "<init>",
+ Type.VOID, new Type[]{i_stream},
+ Constants.INVOKESPECIAL));
+ il.append(factory.createInvoke("java.io.BufferedReader", "<init>",
Type.VOID,
+ new Type[]{new ObjectType("java.io.Reader")},
+ Constants.INVOKESPECIAL));
+
+ // Create local variable `in'
+ LocalVariableGen lg = mg.addLocalVariable("in", new
ObjectType("java.io.BufferedReader"), null, null);
+ int in = lg.getIndex();
+ lg.setStart(il.append(new ASTORE(in))); // `i' valid from here
+
+ // Create local variable `name'
+ lg = mg.addLocalVariable("name", Type.STRING, null, null);
+ int name = lg.getIndex();
+ il.append(InstructionConstants.ACONST_NULL);
+ lg.setStart(il.append(new ASTORE(name))); // `name' valid from here
+
+ // try { ...
+ InstructionHandle try_start =
+ il.append(factory.createFieldAccess("java.lang.System", "out",
p_stream, Constants.GETSTATIC));
+
+ il.append(new PUSH(cp, "Please enter your name> "));
+ il.append(factory.createInvoke("java.io.PrintStream", "print",
Type.VOID,
+ new Type[]{Type.STRING}, Constants.INVOKEVIRTUAL));
+ il.append(new ALOAD(in));
+ il.append(factory.createInvoke("java.io.BufferedReader", "readLine",
+ Type.STRING, Type.NO_ARGS, Constants.INVOKEVIRTUAL));
+ il.append(new ASTORE(name));
+
+ // Upon normal execution we jump behind exception handler, the target
address is not known yet.
+ GOTO g = new GOTO(null);
+ InstructionHandle try_end = il.append(g);
+
+ /* } catch() { ... }
+ * Add exception handler: print exception and return from method
+ */
+ InstructionHandle handler =
+ il.append(factory.createFieldAccess("java.lang.System", "out",
p_stream, Constants.GETSTATIC));
+ // Little trick in order not to save exception object temporarily
+ il.append(InstructionConstants.SWAP);
+
+ il.append(factory.createInvoke("java.io.PrintStream", "println",
Type.VOID, new Type[]{Type.OBJECT}, Constants.INVOKEVIRTUAL));
+ il.append(InstructionConstants.RETURN);
+ mg.addExceptionHandler(try_start, try_end, handler, new
ObjectType("java.io.IOException"));
+
+ // Normal code continues, now we can set the branch target of the GOTO
that jumps over the handler code.
+ InstructionHandle ih =
+ il.append(factory.createFieldAccess("java.lang.System", "out",
p_stream, Constants.GETSTATIC));
+ g.setTarget(ih);
+
+ // String concatenation compiles to StringBuffer operations.
+ il.append(factory.createNew(Type.STRINGBUFFER));
+ il.append(InstructionConstants.DUP);
+ il.append(new PUSH(cp, "Hello, "));
+ il.append(factory.createInvoke("java.lang.StringBuffer", "<init>",
+ Type.VOID, new Type[]{Type.STRING},
+ Constants.INVOKESPECIAL));
+ il.append(new ALOAD(name));
- il.append(factory.createInvoke("java.io.PrintStream", "println",
- Type.VOID, new Type[] { Type.STRING },
- Constants.INVOKEVIRTUAL));
-
- il.append(InstructionConstants.RETURN);
-
- mg.setMaxStack(5); // Needed stack size
- cg.addMethod(mg.getMethod());
-
- il.dispose(); // Reuse instruction handles
-
- /* Add public <init> method, i.e. empty constructor
- */
- cg.addEmptyConstructor(Constants.ACC_PUBLIC);
-
- /* Get JavaClass object and dump it to file.
- */
- try {
- cg.getJavaClass().dump("HelloWorld.class");
- } catch(java.io.IOException e) { System.err.println(e); }
- }
+ // Concatenate strings using a StringBuffer and print them.
+ il.append(factory.createInvoke("java.lang.StringBuffer", "append",
+ Type.STRINGBUFFER, new Type[]{Type.STRING},
+ Constants.INVOKEVIRTUAL));
+ il.append(factory.createInvoke("java.lang.StringBuffer", "toString",
+ Type.STRING, Type.NO_ARGS,
+ Constants.INVOKEVIRTUAL));
+
+ il.append(factory.createInvoke("java.io.PrintStream", "println",
+ Type.VOID, new Type[]{Type.STRING},
+ Constants.INVOKEVIRTUAL));
+
+ il.append(InstructionConstants.RETURN);
+
+ mg.setMaxStack(5); // Needed stack size
+ cg.addMethod(mg.getMethod());
+
+ il.dispose(); // Reuse instruction handles
+
+ // Add public <init> method, i.e. empty constructor
+ cg.addEmptyConstructor(Constants.ACC_PUBLIC);
+
+ // Get JavaClass object and dump it to file.
+ try {
+ cg.getJavaClass().dump("HelloWorld.class");
+ } catch (IOException e) {
+ System.err.println(e);
+ }
+ }
}
Modified: commons/proper/bcel/trunk/src/examples/JasminVisitor.java
URL:
http://svn.apache.org/viewvc/commons/proper/bcel/trunk/src/examples/JasminVisitor.java?rev=1661091&r1=1661090&r2=1661091&view=diff
==============================================================================
--- commons/proper/bcel/trunk/src/examples/JasminVisitor.java (original)
+++ commons/proper/bcel/trunk/src/examples/JasminVisitor.java Fri Feb 20
11:11:54 2015
@@ -15,6 +15,7 @@
* limitations under the License.
*
*/
+
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
@@ -22,6 +23,7 @@ import java.io.PrintWriter;
import java.util.Date;
import java.util.Hashtable;
import java.util.StringTokenizer;
+
import org.apache.bcel.Constants;
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.Attribute;
@@ -53,294 +55,282 @@ import org.apache.bcel.generic.TABLESWIT
* Disassemble Java class object into the <a
href="http://jasmin.sourceforge.net";>
* Jasmin</a> format.
*
- * @version $Id$
* @author <A HREF="mailto:[email protected]";>M. Dahm</A>
+ * @version $Id$
*/
public class JasminVisitor extends org.apache.bcel.classfile.EmptyVisitor {
- private JavaClass clazz;
- private PrintWriter out;
- private String class_name;
- private ConstantPoolGen cp;
-
- public JasminVisitor(JavaClass clazz, OutputStream out) {
- this.clazz = clazz;
- this.out = new PrintWriter(out);
- class_name = clazz.getClassName();
- cp = new ConstantPoolGen(clazz.getConstantPool());
- }
-
- /**
- * Start traversal using DefaultVisitor pattern.
- */
- public void disassemble() {
- new org.apache.bcel.classfile.DescendingVisitor(clazz, this).visit();
- out.close();
- }
-
- @Override
- public void visitJavaClass(JavaClass clazz) {
- out.println(";; Produced by JasminVisitor (BCEL)");
- out.println(";; http://commons.apache.org/bcel/";);
- out.println(";; " + new Date() + "\n");
-
- out.println(".source " + clazz.getSourceFileName());
- out.println("." + Utility.classOrInterface(clazz.getAccessFlags()) + " " +
- Utility.accessToString(clazz.getAccessFlags(), true) +
- " " + clazz.getClassName().replace('.', '/'));
- out.println(".super " + clazz.getSuperclassName().replace('.', '/'));
-
- String[] interfaces = clazz.getInterfaceNames();
-
- for(int i=0; i < interfaces.length; i++) {
- out.println(".implements " + interfaces[i].replace('.', '/'));
- }
-
- out.print("\n");
- }
-
- @Override
- public void visitField(Field field) {
- out.print(".field " + Utility.accessToString(field.getAccessFlags()) +
- " \"" +field.getName() + "\"" + field.getSignature());
- if(field.getAttributes().length == 0) {
+ private JavaClass clazz;
+ private PrintWriter out;
+ private String class_name;
+ private ConstantPoolGen cp;
+
+ public JasminVisitor(JavaClass clazz, OutputStream out) {
+ this.clazz = clazz;
+ this.out = new PrintWriter(out);
+ this.class_name = clazz.getClassName();
+ this.cp = new ConstantPoolGen(clazz.getConstantPool());
+ }
+
+ /**
+ * Start traversal using DefaultVisitor pattern.
+ */
+ public void disassemble() {
+ new org.apache.bcel.classfile.DescendingVisitor(clazz, this).visit();
+ out.close();
+ }
+
+ @Override
+ public void visitJavaClass(JavaClass clazz) {
+ out.println(";; Produced by JasminVisitor (BCEL)");
+ out.println(";; http://commons.apache.org/bcel/";);
+ out.println(";; " + new Date() + "\n");
+
+ out.println(".source " + clazz.getSourceFileName());
+ out.println("." + Utility.classOrInterface(clazz.getAccessFlags()) + "
" +
+ Utility.accessToString(clazz.getAccessFlags(), true) +
+ " " + clazz.getClassName().replace('.', '/'));
+ out.println(".super " + clazz.getSuperclassName().replace('.', '/'));
+
+ for (String iface : clazz.getInterfaceNames()) {
+ out.println(".implements " + iface.replace('.', '/'));
+ }
+
out.print("\n");
}
- }
- @Override
- public void visitConstantValue(ConstantValue cv) {
- out.println(" = " + cv);
- }
-
- private Method _method;
-
- /**
- * Unfortunately Jasmin expects ".end method" after each method. Thus we've
to check
- * for every of the method's attributes if it's the last one and print ".end
method"
- * then.
- */
- private void printEndMethod(Attribute attr) {
- Attribute[] attributes = _method.getAttributes();
-
- if(attr == attributes[attributes.length - 1]) {
- out.println(".end method");
- }
- }
-
- @Override
- public void visitDeprecated(Deprecated attribute) {
printEndMethod(attribute); }
-
- @Override
- public void visitSynthetic(Synthetic attribute) {
- if(_method != null) {
- printEndMethod(attribute);
+ @Override
+ public void visitField(Field field) {
+ out.print(".field " + Utility.accessToString(field.getAccessFlags()) +
+ " \"" + field.getName() + "\"" + field.getSignature());
+ if (field.getAttributes().length == 0) {
+ out.print("\n");
+ }
}
- }
- @Override
- public void visitMethod(Method method) {
- this._method = method; // Remember for use in subsequent visitXXX calls
+ @Override
+ public void visitConstantValue(ConstantValue cv) {
+ out.println(" = " + cv);
+ }
- out.println("\n.method " +
Utility.accessToString(_method.getAccessFlags()) +
- " " + _method.getName() + _method.getSignature());
+ private Method _method;
- Attribute[] attributes = _method.getAttributes();
- if((attributes == null) || (attributes.length == 0)) {
- out.println(".end method");
+ /**
+ * Unfortunately Jasmin expects ".end method" after each method. Thus
we've to check
+ * for every of the method's attributes if it's the last one and print
".end method"
+ * then.
+ */
+ private void printEndMethod(Attribute attr) {
+ Attribute[] attributes = _method.getAttributes();
+
+ if (attr == attributes[attributes.length - 1]) {
+ out.println(".end method");
+ }
}
- }
- @Override
- public void visitExceptionTable(ExceptionTable e) {
- String[] names = e.getExceptionNames();
- for(int i=0; i < names.length; i++) {
- out.println(".throws " + names[i].replace('.', '/'));
+ @Override
+ public void visitDeprecated(Deprecated attribute) {
+ printEndMethod(attribute);
}
- printEndMethod(e);
- }
+ @Override
+ public void visitSynthetic(Synthetic attribute) {
+ if (_method != null) {
+ printEndMethod(attribute);
+ }
+ }
- private Hashtable<InstructionHandle, String> map;
+ @Override
+ public void visitMethod(Method method) {
+ this._method = method; // Remember for use in subsequent visitXXX calls
+
+ out.println("\n.method " +
Utility.accessToString(_method.getAccessFlags()) +
+ " " + _method.getName() + _method.getSignature());
+
+ Attribute[] attributes = _method.getAttributes();
+ if ((attributes == null) || (attributes.length == 0)) {
+ out.println(".end method");
+ }
+ }
- @Override
- public void visitCode(Code code) {
- int label_counter = 0;
+ @Override
+ public void visitExceptionTable(ExceptionTable e) {
+ for (String name : e.getExceptionNames()) {
+ out.println(".throws " + name.replace('.', '/'));
+ }
+
+ printEndMethod(e);
+ }
- out.println(".limit stack " + code.getMaxStack());
- out.println(".limit locals " + code.getMaxLocals());
+ private Hashtable<InstructionHandle, String> map;
- MethodGen mg = new MethodGen(_method, class_name, cp);
- InstructionList il = mg.getInstructionList();
- InstructionHandle[] ihs = il.getInstructionHandles();
+ @Override
+ public void visitCode(Code code) {
+ int label_counter = 0;
+
+ out.println(".limit stack " + code.getMaxStack());
+ out.println(".limit locals " + code.getMaxLocals());
+
+ MethodGen mg = new MethodGen(_method, class_name, cp);
+ InstructionList il = mg.getInstructionList();
+ InstructionHandle[] ihs = il.getInstructionHandles();
/* Pass 1: Give all referenced instruction handles a symbolic name, i.e. a
* label.
*/
- map = new Hashtable<InstructionHandle, String>();
+ map = new Hashtable<InstructionHandle, String>();
+
+ for (InstructionHandle ih1 : ihs) {
+ if (ih1 instanceof BranchHandle) {
+ BranchInstruction bi = (BranchInstruction)
ih1.getInstruction();
+
+ if (bi instanceof Select) { // Special cases LOOKUPSWITCH and
TABLESWITCH
+ for (InstructionHandle target : ((Select)
bi).getTargets()) {
+ put(target, "Label" + label_counter++ + ":");
+ }
+ }
+
+ InstructionHandle ih = bi.getTarget();
+ put(ih, "Label" + label_counter++ + ":");
+ }
+ }
+
+ LocalVariableGen[] lvs = mg.getLocalVariables();
+ for (LocalVariableGen lv : lvs) {
+ InstructionHandle ih = lv.getStart();
+ put(ih, "Label" + label_counter++ + ":");
+ ih = lv.getEnd();
+ put(ih, "Label" + label_counter++ + ":");
+ }
+
+ CodeExceptionGen[] ehs = mg.getExceptionHandlers();
+ for (CodeExceptionGen c : ehs) {
+ InstructionHandle ih = c.getStartPC();
+
+ put(ih, "Label" + label_counter++ + ":");
+ ih = c.getEndPC();
+ put(ih, "Label" + label_counter++ + ":");
+ ih = c.getHandlerPC();
+ put(ih, "Label" + label_counter++ + ":");
+ }
+
+ LineNumberGen[] lns = mg.getLineNumbers();
+ for (LineNumberGen ln : lns) {
+ InstructionHandle ih = ln.getInstruction();
+ put(ih, ".line " + ln.getSourceLine());
+ }
- for(int i=0; i < ihs.length; i++) {
- if(ihs[i] instanceof BranchHandle) {
- BranchInstruction bi = (BranchInstruction)ihs[i].getInstruction();
-
- if(bi instanceof Select) { // Special cases LOOKUPSWITCH and TABLESWITCH
- InstructionHandle[] targets = ((Select)bi).getTargets();
-
- for(int j=0; j < targets.length; j++) {
- put(targets[j], "Label" + label_counter++ + ":");
+ // Pass 2: Output code.
+ for (LocalVariableGen l : lvs) {
+ out.println(".var " + l.getIndex() + " is " + l.getName() + " " +
+ l.getType().getSignature() +
+ " from " + get(l.getStart()) +
+ " to " + get(l.getEnd()));
+ }
+
+ out.print("\n");
+
+ for (InstructionHandle ih : ihs) {
+ Instruction inst = ih.getInstruction();
+ String str = map.get(ih);
+
+ if (str != null) {
+ out.println(str);
+ }
+
+ if (inst instanceof BranchInstruction) {
+ if (inst instanceof Select) { // Special cases LOOKUPSWITCH
and TABLESWITCH
+ Select s = (Select) inst;
+ int[] matchs = s.getMatchs();
+ InstructionHandle[] targets = s.getTargets();
+
+ if (s instanceof TABLESWITCH) {
+ out.println("\ttableswitch " + matchs[0] + " " +
matchs[matchs.length - 1]);
+
+ for (InstructionHandle target : targets) {
+ out.println("\t\t" + get(target));
+ }
+
+ } else { // LOOKUPSWITCH
+ out.println("\tlookupswitch ");
+
+ for (int j = 0; j < targets.length; j++) {
+ out.println("\t\t" + matchs[j] + " : " +
get(targets[j]));
+ }
+ }
+
+ out.println("\t\tdefault: " + get(s.getTarget())); //
Applies for both
+ } else {
+ BranchInstruction bi = (BranchInstruction) inst;
+ ih = bi.getTarget();
+ str = get(ih);
+ out.println("\t" + Constants.OPCODE_NAMES[bi.getOpcode()]
+ " " + str);
+ }
+ } else {
+ out.println("\t" + inst.toString(cp.getConstantPool()));
+ }
+ }
+
+ out.print("\n");
+
+ for (CodeExceptionGen c : ehs) {
+ ObjectType caught = c.getCatchType();
+ String class_name = (caught == null) ? // catch any exception,
used when compiling finally
+ "all" : caught.getClassName().replace('.', '/');
+
+ out.println(".catch " + class_name + " from " +
+ get(c.getStartPC()) + " to " + get(c.getEndPC()) +
+ " using " + get(c.getHandlerPC()));
+ }
+
+ printEndMethod(code);
}
+
+ private String get(InstructionHandle ih) {
+ String str = new StringTokenizer(map.get(ih), "\n").nextToken();
+ return str.substring(0, str.length() - 1);
}
- InstructionHandle ih = bi.getTarget();
- put(ih, "Label" + label_counter++ + ":");
- }
- }
-
- LocalVariableGen[] lvs = mg.getLocalVariables();
- for(int i=0; i < lvs.length; i++) {
- InstructionHandle ih = lvs[i].getStart();
- put(ih, "Label" + label_counter++ + ":");
- ih = lvs[i].getEnd();
- put(ih, "Label" + label_counter++ + ":");
- }
-
- CodeExceptionGen[] ehs = mg.getExceptionHandlers();
- for(int i=0; i < ehs.length; i++) {
- CodeExceptionGen c = ehs[i];
- InstructionHandle ih = c.getStartPC();
-
- put(ih, "Label" + label_counter++ + ":");
- ih = c.getEndPC();
- put(ih, "Label" + label_counter++ + ":");
- ih = c.getHandlerPC();
- put(ih, "Label" + label_counter++ + ":");
- }
-
- LineNumberGen[] lns = mg.getLineNumbers();
- for(int i=0; i < lns.length; i++) {
- InstructionHandle ih = lns[i].getInstruction();
- put(ih, ".line " + lns[i].getSourceLine());
+ private void put(InstructionHandle ih, String line) {
+ String str = map.get(ih);
+
+ if (str == null) {
+ map.put(ih, line);
+ } else {
+ if (line.startsWith("Label") || str.endsWith(line)) {
+ return;
+ }
+
+ map.put(ih, str + "\n" + line); // append
+ }
}
-
- /* Pass 2: Output code.
- */
- for(int i=0; i < lvs.length; i++) {
- LocalVariableGen l = lvs[i];
- out.println(".var " + l.getIndex() + " is " + l.getName() + " " +
- l.getType().getSignature() +
- " from " + get(l.getStart()) +
- " to " + get(l.getEnd()));
- }
-
- out.print("\n");
-
- for(int i=0; i < ihs.length; i++) {
- InstructionHandle ih = ihs[i];
- Instruction inst = ih.getInstruction();
- String str = map.get(ih);
-
- if(str != null) {
- out.println(str);
- }
-
- if(inst instanceof BranchInstruction) {
- if(inst instanceof Select) { // Special cases LOOKUPSWITCH and TABLESWITCH
- Select s = (Select)inst;
- int[] matchs = s.getMatchs();
- InstructionHandle[] targets = s.getTargets();
-
- if(s instanceof TABLESWITCH) {
- out.println("\ttableswitch " + matchs[0] + " " +
- matchs[matchs.length - 1]);
-
- for(int j=0; j < targets.length; j++) {
- out.println("\t\t" + get(targets[j]));
- }
-
- } else { // LOOKUPSWITCH
- out.println("\tlookupswitch ");
-
- for(int j=0; j < targets.length; j++) {
- out.println("\t\t" + matchs[j] + " : " + get(targets[j]));
- }
- }
-
- out.println("\t\tdefault: " + get(s.getTarget())); // Applies for both
- } else {
- BranchInstruction bi = (BranchInstruction)inst;
- ih = bi.getTarget();
- str = get(ih);
- out.println("\t" + Constants.OPCODE_NAMES[bi.getOpcode()] + " " + str);
- }
- } else {
- out.println("\t" + inst.toString(cp.getConstantPool()));
- }
- }
-
- out.print("\n");
-
- for(int i=0; i < ehs.length; i++) {
- CodeExceptionGen c = ehs[i];
- ObjectType caught = c.getCatchType();
- String class_name = (caught == null)? // catch any exception, used when
compiling finally
- "all" : caught.getClassName().replace('.', '/');
-
- out.println(".catch " + class_name + " from " +
- get(c.getStartPC()) + " to " + get(c.getEndPC()) +
- " using " + get(c.getHandlerPC()));
- }
-
- printEndMethod(code);
- }
-
- private String get(InstructionHandle ih) {
- String str = new StringTokenizer(map.get(ih), "\n").nextToken();
- return str.substring(0, str.length() - 1);
- }
-
- private void put(InstructionHandle ih, String line) {
- String str = map.get(ih);
-
- if(str == null) {
- map.put(ih, line);
- } else {
- if(line.startsWith("Label") || str.endsWith(line)) {
- return;
- }
-
- map.put(ih, str + "\n" + line); // append
- }
- }
-
- public static void main(String[] argv) {
- JavaClass java_class;
-
- try {
- if(argv.length == 0) {
- System.err.println("disassemble: No input files specified");
- } else {
- for(int i=0; i < argv.length; i++) {
- if((java_class = Repository.lookupClass(argv[i])) == null) {
- java_class = new ClassParser(argv[i]).parse();
- }
-
- String class_name = java_class.getClassName();
- int index = class_name.lastIndexOf('.');
- String path = class_name.substring(0, index + 1).replace('.',
File.separatorChar);
- class_name = class_name.substring(index + 1);
-
- if(!path.equals("")) {
- File f = new File(path);
- f.mkdirs();
- }
-
- String name = path + class_name + ".j";
- FileOutputStream out = new FileOutputStream(name);
- new JasminVisitor(java_class, out).disassemble();
- System.out.println("File dumped to: " + name);
- }
- }
- } catch(Exception e) {
- e.printStackTrace();
+
+ public static void main(String[] argv) throws Exception {
+ JavaClass java_class;
+
+ if (argv.length == 0) {
+ System.err.println("disassemble: No input files specified");
+ return;
+ }
+
+ for (String arg : argv) {
+ if ((java_class = Repository.lookupClass(arg)) == null) {
+ java_class = new ClassParser(arg).parse();
+ }
+
+ String class_name = java_class.getClassName();
+ int index = class_name.lastIndexOf('.');
+ String path = class_name.substring(0, index + 1).replace('.',
File.separatorChar);
+ class_name = class_name.substring(index + 1);
+
+ if (!path.equals("")) {
+ File f = new File(path);
+ f.mkdirs();
+ }
+
+ String name = path + class_name + ".j";
+ FileOutputStream out = new FileOutputStream(name);
+ new JasminVisitor(java_class, out).disassemble();
+ System.out.println("File dumped to: " + name);
+ }
}
- }
}
Modified: commons/proper/bcel/trunk/src/examples/Package.java
URL:
http://svn.apache.org/viewvc/commons/proper/bcel/trunk/src/examples/Package.java?rev=1661091&r1=1661090&r2=1661091&view=diff
==============================================================================
--- commons/proper/bcel/trunk/src/examples/Package.java (original)
+++ commons/proper/bcel/trunk/src/examples/Package.java Fri Feb 20 11:11:54 2015
@@ -15,6 +15,7 @@
* limitations under the License.
*
*/
+
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
@@ -36,235 +37,247 @@ import org.apache.bcel.classfile.JavaCla
import org.apache.bcel.util.ClassPath;
/**
- * Package the client. Creates a jar file in the current directory
+ * Package the client. Creates a jar file in the current directory
* that contains a minimal set of classes needed to run the client.
*
* Use BCEL to extract class names and read/write classes
+ *
* @author First Hop Ltd / Torsten Rueger
*/
public class Package {
-
- /**
- * The name of the resulting jar is Client.jar
- */
- static String defaultJar = "Client.jar";
-
- /*
- * See usage() for arguments. Create an instance and run that
- *(just so not all members have to be static)
- */
- static void main(String args[]) {
- Package instance = new Package();
- try{
- instance.go(args);
- }catch(Exception e){
- e.printStackTrace();
- instance.usage();
- }
- }
-
- /**
- * We use a "default ClassPath object which uses the environments
- * CLASSPATH
- */
- ClassPath classPath = ClassPath.SYSTEM_CLASS_PATH;
-
- /**
- * A map for all Classes, the ones we're going to package.
- * Store class name against the JavaClass. From the JavaClass
- * we get the bytes to create the jar.
- */
- Map<String, JavaClass> allClasses = new TreeMap<String, JavaClass>();
- /**
- * We start at the root classes, put them in here, then go through
- * this list, putting dependent classes in here and from there
- * into allClasses. Store class names against class names of their dependents
- */
- TreeMap<String, String> dependents = new TreeMap<String, String>();
- /**
- * Collect all classes that could not be found in the classpath.
- * Store class names against class names of their dependents
- */
- TreeMap<String, String> notFound = new TreeMap<String, String>();
- /**
- * See wheather we print the classes that were not found (default = false)
- */
- boolean showNotFound = false ;
- /**
- * Remember wheather to print allClasses at the end (default = false)
- */
- boolean printClasses = false ;
- /**
- * Wheather we log classes during processing (default = false)
- */
- boolean log = false ;
-
- public void usage(){
- System.out.println(" This program packages classes and all their
dependents");
- System.out.println(" into one jar. Give all starting classes (your main)");
- System.out.println(" on the command line. Use / as separator, the .class
is");
- System.out.println(" optional. We use the environments CLASSPATH to
resolve");
- System.out.println(" classes. Anything but java.* packages are packaged.");
- System.out.println(" If you use Class.forName (or similar), be sure to");
- System.out.println(" include the classes that you load dynamically on
the");
- System.out.println(" command line.\n");
- System.out.println(" These options are recognized:");
- System.out.println(" -e -error Show errors, meaning classes that could
not ");
- System.out.println(" resolved + the classes that referenced them.");
- System.out.println(" -l -log Show classes as they are processed. This
will");
- System.out.println(" include doubles, java classes and is difficult to");
- System.out.println(" read. I use it as a sort of progress monitor");
- System.out.println(" -s -show Prints all the classes that were packaged");
- System.out.println(" in alphabetical order, which is ordered by
package");
- System.out.println(" for the most part.");
- }
- /**
- * the main of this class
- */
- void go(String[] args) throws IOException {
- JavaClass clazz ;
- // sort the options
- for(int i = 0 ; i < args.length ; i++ ){
- if( args[i].startsWith("-e") ) {
- showNotFound = true;
- continue;
- }
- if( args[i].startsWith("-s") ) {
- printClasses = true ;
- continue;
- }
- if( args[i].startsWith("-l") ) {
- log = true ;
- continue;
- }
- String clName = args[i];
- if(clName.endsWith(".class")) {
- clName = clName.substring(0,clName.length()-6);
- }
- clName = clName.replace('.','/');
- clazz = new ClassParser(classPath.getInputStream(clName),clName).parse();
- // here we create the root set of classes to process
- addDependents(clazz);
- System.out.println("Packaging for class: " + clName );
- }
- if( dependents.isEmpty() ){
- usage();
- return ;
- }
- System.out.println("Creating jar file: " + defaultJar );
- // starting processing: Grab from the dependents list an add back to it
- // and the allClasses list. see addDependents
- while(!dependents.isEmpty() ){
- String name = dependents.firstKey();
- String from = dependents.remove(name);
- if(allClasses.get(name) == null){
- try{
- InputStream is = classPath.getInputStream(name);
- clazz = new ClassParser(is, name).parse();
- addDependents(clazz);
- }catch( IOException e){
- //System.err.println("Error, class not found " + name );
- notFound.put(name,from);
- }
- }
- }
- if(printClasses) { // if wanted show all classes
- printAllClasses();
- }
- // create the jar
- JarOutputStream jarFile = new JarOutputStream(new
FileOutputStream(defaultJar));
- jarFile.setLevel(5); // use compression
- int written = 0;
- for (String name : allClasses.keySet()) { // add entries for every class
- JavaClass claz = allClasses.get(name);
- ZipEntry zipEntry = new ZipEntry(name+".class");
- byte[] bytes = claz.getBytes() ;
- int length = bytes.length ;
- jarFile.putNextEntry(zipEntry);
- jarFile.write( bytes , 0 , length );
- written += length; // for logging
- }
- jarFile.close();
- System.err.println("The jar file contains " + allClasses.size()
- +" classes and contains " +written+ " bytes");
- if( !notFound.isEmpty() ){
- System.err.println( notFound.size() +" classes could not be found");
- if(showNotFound){ // if wanted show the actual classes that we not found
- while(!notFound.isEmpty()){
- String name = notFound.firstKey();
- System.err.println( name+ " (" + notFound.remove(name)+")");
- }
- }else{
- System.err.println("Use '-e' option to view classes that were not found");
- }
+
+ /**
+ * The name of the resulting jar is Client.jar
+ */
+ static String defaultJar = "Client.jar";
+
+ /*
+ * See usage() for arguments. Create an instance and run that
+ *(just so not all members have to be static)
+ */
+ static void main(String args[]) {
+ Package instance = new Package();
+ try {
+ instance.go(args);
+ } catch (Exception e) {
+ e.printStackTrace();
+ instance.usage();
+ }
}
- }
- /**
- * Print all classes that were packaged. Sort alphabetically for better
- * overview. Enabled by -s option
- */
- void printAllClasses(){
- List<String> names = new ArrayList<String>(allClasses.keySet());
- Collections.sort(names);
- for( int i = 0 ; i < names.size() ; i ++ ){
- String cl = names.get(i);
- System.err.println(cl);
+ /**
+ * We use a "default ClassPath object which uses the environments
+ * CLASSPATH
+ */
+ ClassPath classPath = ClassPath.SYSTEM_CLASS_PATH;
+
+ /**
+ * A map for all Classes, the ones we're going to package.
+ * Store class name against the JavaClass. From the JavaClass
+ * we get the bytes to create the jar.
+ */
+ Map<String, JavaClass> allClasses = new TreeMap<String, JavaClass>();
+
+ /**
+ * We start at the root classes, put them in here, then go through
+ * this list, putting dependent classes in here and from there
+ * into allClasses. Store class names against class names of their
dependents
+ */
+ TreeMap<String, String> dependents = new TreeMap<String, String>();
+
+ /**
+ * Collect all classes that could not be found in the classpath.
+ * Store class names against class names of their dependents
+ */
+ TreeMap<String, String> notFound = new TreeMap<String, String>();
+
+ /**
+ * See wheather we print the classes that were not found (default = false)
+ */
+ boolean showNotFound = false;
+ /**
+ * Remember wheather to print allClasses at the end (default = false)
+ */
+ boolean printClasses = false;
+ /**
+ * Wheather we log classes during processing (default = false)
+ */
+ boolean log = false;
+
+ public void usage() {
+ System.out.println(" This program packages classes and all their
dependents");
+ System.out.println(" into one jar. Give all starting classes (your
main)");
+ System.out.println(" on the command line. Use / as separator, the
.class is");
+ System.out.println(" optional. We use the environments CLASSPATH to
resolve");
+ System.out.println(" classes. Anything but java.* packages are
packaged.");
+ System.out.println(" If you use Class.forName (or similar), be sure
to");
+ System.out.println(" include the classes that you load dynamically on
the");
+ System.out.println(" command line.\n");
+ System.out.println(" These options are recognized:");
+ System.out.println(" -e -error Show errors, meaning classes that
could not ");
+ System.out.println(" resolved + the classes that referenced them.");
+ System.out.println(" -l -log Show classes as they are processed. This
will");
+ System.out.println(" include doubles, java classes and is difficult
to");
+ System.out.println(" read. I use it as a sort of progress monitor");
+ System.out.println(" -s -show Prints all the classes that were
packaged");
+ System.out.println(" in alphabetical order, which is ordered by
package");
+ System.out.println(" for the most part.");
}
- }
-
- /**
- *Add this class to allClasses. Then go through all its dependents
- * and add them to the dependents list if they are not in allClasses
- */
- void addDependents( JavaClass clazz ) throws IOException {
- String name = clazz.getClassName().replace('.', '/');
- allClasses.put( name , clazz );
- ConstantPool pool = clazz.getConstantPool();
- for( int i = 1 ; i < pool.getLength() ; i++){
- Constant cons = pool.getConstant(i);
- //System.out.println("("+i+") " + cons );
- if( cons!=null && cons.getTag() == Constants.CONSTANT_Class ){
- int idx = ((ConstantClass)pool.getConstant(i)).getNameIndex();
- String clas = ((ConstantUtf8)pool.getConstant(idx)).getBytes();
- addClassString(clas,name);
- }
+
+ /**
+ * the main of this class
+ */
+ void go(String[] args) throws IOException {
+ JavaClass clazz;
+ // sort the options
+ for (String arg : args) {
+ if (arg.startsWith("-e")) {
+ showNotFound = true;
+ continue;
+ }
+ if (arg.startsWith("-s")) {
+ printClasses = true;
+ continue;
+ }
+ if (arg.startsWith("-l")) {
+ log = true;
+ continue;
+ }
+ String clName = arg;
+ if (clName.endsWith(".class")) {
+ clName = clName.substring(0, clName.length() - 6);
+ }
+ clName = clName.replace('.', '/');
+ clazz = new ClassParser(classPath.getInputStream(clName),
clName).parse();
+ // here we create the root set of classes to process
+ addDependents(clazz);
+ System.out.println("Packaging for class: " + clName);
+ }
+
+ if (dependents.isEmpty()) {
+ usage();
+ return;
+ }
+
+ System.out.println("Creating jar file: " + defaultJar);
+
+ // starting processing: Grab from the dependents list an add back to it
+ // and the allClasses list. see addDependents
+ while (!dependents.isEmpty()) {
+ String name = dependents.firstKey();
+ String from = dependents.remove(name);
+ if (allClasses.get(name) == null) {
+ try {
+ InputStream is = classPath.getInputStream(name);
+ clazz = new ClassParser(is, name).parse();
+ addDependents(clazz);
+ } catch (IOException e) {
+ //System.err.println("Error, class not found " + name );
+ notFound.put(name, from);
+ }
+ }
+ }
+
+ if (printClasses) { // if wanted show all classes
+ printAllClasses();
+ }
+
+ // create the jar
+ JarOutputStream jarFile = new JarOutputStream(new
FileOutputStream(defaultJar));
+ jarFile.setLevel(5); // use compression
+ int written = 0;
+ for (String name : allClasses.keySet()) { // add entries for every
class
+ JavaClass claz = allClasses.get(name);
+ ZipEntry zipEntry = new ZipEntry(name + ".class");
+ byte[] bytes = claz.getBytes();
+ int length = bytes.length;
+ jarFile.putNextEntry(zipEntry);
+ jarFile.write(bytes, 0, length);
+ written += length; // for logging
+ }
+ jarFile.close();
+ System.err.println("The jar file contains " + allClasses.size()
+ + " classes and contains " + written + " bytes");
+
+ if (!notFound.isEmpty()) {
+ System.err.println(notFound.size() + " classes could not be
found");
+ if (showNotFound) { // if wanted show the actual classes that we
not found
+ while (!notFound.isEmpty()) {
+ String name = notFound.firstKey();
+ System.err.println(name + " (" + notFound.remove(name) +
")");
+ }
+ } else {
+ System.err.println("Use '-e' option to view classes that were
not found");
+ }
+ }
}
- }
- /**
- * add given class to dependents (from is where its dependent from)
- * some fiddeling to be done because of array class notation
- */
- void addClassString(String clas,String from) throws IOException{
- if(log){
- System.out.println("processing: " + clas +" referenced by " + from);
+ /**
+ * Print all classes that were packaged. Sort alphabetically for better
+ * overview. Enabled by -s option
+ */
+ void printAllClasses() {
+ List<String> names = new ArrayList<String>(allClasses.keySet());
+ Collections.sort(names);
+ for (int i = 0; i < names.size(); i++) {
+ String cl = names.get(i);
+ System.err.println(cl);
+ }
}
- // must check if it's an arrary (start with "[")
- if(clas.startsWith("[")) {
- if(clas.length() == 2 ) {
- // it's an array of built in type, ignore
- return;
- }
- if( 'L' == clas.charAt(1) ){
- // it's an array of objects, the class name is between [L and ;
- // like [Ljava/lang/Object;
- addClassString(clas.substring(2,clas.length()-1),from);
- return;
- }
- if( '[' == clas.charAt(1) ){
- // it's an array of arrays, call recursive
- addClassString(clas.substring(1),from);
- return ;
- }
- throw new IOException("Can't recognize class name =" + clas);
+
+ /**
+ * Add this class to allClasses. Then go through all its dependents
+ * and add them to the dependents list if they are not in allClasses
+ */
+ void addDependents(JavaClass clazz) throws IOException {
+ String name = clazz.getClassName().replace('.', '/');
+ allClasses.put(name, clazz);
+ ConstantPool pool = clazz.getConstantPool();
+ for (int i = 1; i < pool.getLength(); i++) {
+ Constant cons = pool.getConstant(i);
+ //System.out.println("("+i+") " + cons );
+ if (cons != null && cons.getTag() == Constants.CONSTANT_Class) {
+ int idx = ((ConstantClass) pool.getConstant(i)).getNameIndex();
+ String clas = ((ConstantUtf8)
pool.getConstant(idx)).getBytes();
+ addClassString(clas, name);
+ }
+ }
}
- if( !clas.startsWith("java/") && allClasses.get(clas) == null) {
- dependents.put(clas,from);
- // System.out.println(" yes" );
- } else {
- // System.out.println(" no" );
+ /**
+ * add given class to dependents (from is where its dependent from)
+ * some fiddeling to be done because of array class notation
+ */
+ void addClassString(String clas, String from) throws IOException {
+ if (log) {
+ System.out.println("processing: " + clas + " referenced by " +
from);
+ }
+
+ // must check if it's an arrary (start with "[")
+ if (clas.startsWith("[")) {
+ if (clas.length() == 2) {
+ // it's an array of built in type, ignore
+ return;
+ }
+ if ('L' == clas.charAt(1)) {
+ // it's an array of objects, the class name is between [L and ;
+ // like [Ljava/lang/Object;
+ addClassString(clas.substring(2, clas.length() - 1), from);
+ return;
+ }
+ if ('[' == clas.charAt(1)) {
+ // it's an array of arrays, call recursive
+ addClassString(clas.substring(1), from);
+ return;
+ }
+ throw new IOException("Can't recognize class name =" + clas);
+ }
+
+ if (!clas.startsWith("java/") && allClasses.get(clas) == null) {
+ dependents.put(clas, from);
+ // System.out.println(" yes" );
+ } else {
+ // System.out.println(" no" );
+ }
}
- }
}
Modified: commons/proper/bcel/trunk/src/examples/Peephole.java
URL:
http://svn.apache.org/viewvc/commons/proper/bcel/trunk/src/examples/Peephole.java?rev=1661091&r1=1661090&r2=1661091&view=diff
==============================================================================
--- commons/proper/bcel/trunk/src/examples/Peephole.java (original)
+++ commons/proper/bcel/trunk/src/examples/Peephole.java Fri Feb 20 11:11:54
2015
@@ -15,7 +15,9 @@
* limitations under the License.
*
*/
+
import java.util.Iterator;
+
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Method;
@@ -30,83 +32,76 @@ import org.apache.bcel.util.InstructionF
/**
* Remove NOPs from given class
*
- * @version $Id$
* @author <A HREF="mailto:[email protected]";>M. Dahm</A>
+ * @version $Id$
*/
public class Peephole {
- public static void main(String[] argv) {
- try {
- /* Load the class from CLASSPATH.
- */
- JavaClass clazz = Repository.lookupClass(argv[0]);
- Method[] methods = clazz.getMethods();
- ConstantPoolGen cp = new ConstantPoolGen(clazz.getConstantPool());
-
- for(int i=0; i < methods.length; i++) {
- if(!(methods[i].isAbstract() || methods[i].isNative())) {
- MethodGen mg = new MethodGen(methods[i],
- clazz.getClassName(), cp);
- Method stripped = removeNOPs(mg);
-
- if(stripped != null) {
- methods[i] = stripped; // Overwrite with stripped method
- }
- }
- }
- /* Dump the class to <class name>_.class
- */
- clazz.setConstantPool(cp.getFinalConstantPool());
- clazz.dump(clazz.getClassName() + "_.class");
- } catch(Exception e) { e.printStackTrace(); }
- }
-
- private static Method removeNOPs(MethodGen mg) {
- InstructionList il = mg.getInstructionList();
- InstructionFinder f = new InstructionFinder(il);
- String pat = "NOP+"; // Find at least one NOP
- InstructionHandle next = null;
- int count = 0;
-
- for(Iterator<InstructionHandle[]> e = f.search(pat); e.hasNext(); ) {
- InstructionHandle[] match = e.next();
- InstructionHandle first = match[0];
- InstructionHandle last = match[match.length - 1];
-
- /* Some nasty Java compilers may add NOP at end of method.
- */
- if((next = last.getNext()) == null) {
- break;
- }
+ public static void main(String[] argv) {
+ try {
+ // Load the class from CLASSPATH.
+ JavaClass clazz = Repository.lookupClass(argv[0]);
+ Method[] methods = clazz.getMethods();
+ ConstantPoolGen cp = new ConstantPoolGen(clazz.getConstantPool());
+
+ for (int i = 0; i < methods.length; i++) {
+ if (!(methods[i].isAbstract() || methods[i].isNative())) {
+ MethodGen mg = new MethodGen(methods[i],
clazz.getClassName(), cp);
+ Method stripped = removeNOPs(mg);
+
+ if (stripped != null) {
+ methods[i] = stripped; // Overwrite with stripped
method
+ }
+ }
+ }
+
+ // Dump the class to <class name>_.class
+ clazz.setConstantPool(cp.getFinalConstantPool());
+ clazz.dump(clazz.getClassName() + "_.class");
+ } catch (Exception e) {
+ e.printStackTrace();
+ }
+ }
+
+ private static Method removeNOPs(MethodGen mg) {
+ InstructionList il = mg.getInstructionList();
+ InstructionFinder f = new InstructionFinder(il);
+ String pat = "NOP+"; // Find at least one NOP
+ InstructionHandle next = null;
+ int count = 0;
+
+ for (Iterator<InstructionHandle[]> e = f.search(pat); e.hasNext(); ) {
+ InstructionHandle[] match = e.next();
+ InstructionHandle first = match[0];
+ InstructionHandle last = match[match.length - 1];
+
+ // Some nasty Java compilers may add NOP at end of method.
+ if ((next = last.getNext()) == null) {
+ break;
+ }
+
+ count += match.length;
+
+ // Delete NOPs and redirect any references to them to the
following (non-nop) instruction.
+ try {
+ il.delete(first, last);
+ } catch (TargetLostException e2) {
+ for (InstructionHandle target : e2.getTargets()) {
+ for (InstructionTargeter targeter : target.getTargeters())
{
+ targeter.updateTarget(target, next);
+ }
+ }
+ }
+ }
+
+ Method m = null;
+
+ if (count > 0) {
+ System.out.println("Removed " + count + " NOP instructions from
method " + mg.getName());
+ m = mg.getMethod();
+ }
- count += match.length;
-
- /* Delete NOPs and redirect any references to them to the following
- * (non-nop) instruction.
- */
- try {
- il.delete(first, last);
- } catch(TargetLostException e2) {
- InstructionHandle[] targets = e2.getTargets();
- for(int i=0; i < targets.length; i++) {
- InstructionTargeter[] targeters = targets[i].getTargeters();
-
- for(int j=0; j < targeters.length; j++) {
- targeters[j].updateTarget(targets[i], next);
- }
- }
- }
+ il.dispose(); // Reuse instruction handles
+ return m;
}
-
- Method m = null;
-
- if(count > 0) {
- System.out.println("Removed " + count + " NOP instructions from method "
+
- mg.getName());
- m = mg.getMethod();
- }
-
- il.dispose(); // Reuse instruction handles
- return m;
- }
}
Modified: commons/proper/bcel/trunk/src/examples/ProxyCreator.java
URL:
http://svn.apache.org/viewvc/commons/proper/bcel/trunk/src/examples/ProxyCreator.java?rev=1661091&r1=1661090&r2=1661091&view=diff
==============================================================================
--- commons/proper/bcel/trunk/src/examples/ProxyCreator.java (original)
+++ commons/proper/bcel/trunk/src/examples/ProxyCreator.java Fri Feb 20
11:11:54 2015
@@ -15,8 +15,10 @@
* limitations under the License.
*
*/
+
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
+
import org.apache.bcel.Constants;
import org.apache.bcel.classfile.Utility;
import org.apache.bcel.generic.ALOAD;
@@ -44,88 +46,91 @@ import org.apache.bcel.generic.Type;
* comparable to the mechanism provided via
* {@code java.lang.reflect.Proxy}, but much more flexible.
*
- * @version $Id$
* @author <A HREF="mailto:[email protected]";>M. Dahm</A>
+ * @version $Id$
* @see org.apache.bcel.util.JavaWrapper
* @see org.apache.bcel.util.ClassLoader
* @see Utility
*/
public class ProxyCreator {
- /** Load class and create instance
- */
- public static Object createProxy(String pack, String class_name) {
- try {
- Class<?> cl = Class.forName(pack + "$$BCEL$$" + class_name);
- return cl.newInstance();
- } catch(Exception e) {
- e.printStackTrace();
- }
- return null;
- }
+ /**
+ * Load class and create instance
+ */
+ public static Object createProxy(String pack, String class_name) {
+ try {
+ Class<?> cl = Class.forName(pack + "$$BCEL$$" + class_name);
+ return cl.newInstance();
+ } catch (Exception e) {
+ e.printStackTrace();
+ }
+
+ return null;
+ }
- /** Create JavaClass object for a simple proxy for an
java.awt.event.ActionListener
- * that just prints the passed arguments, load and use it via the class
loader
- * mechanism.
- */
- public static void main(String[] argv) throws Exception {
- ClassLoader loader = ProxyCreator.class.getClassLoader();
-
- // instanceof won't work here ...
- if(loader.getClass().toString().equals("class
org.apache.bcel.util.ClassLoader")) {
- // Real class name will be set by the class loader
- ClassGen cg = new ClassGen("foo", "java.lang.Object", "",
Constants.ACC_PUBLIC,
- new String[] {"java.awt.event.ActionListener"});
-
- // That's important, otherwise newInstance() won't work
- cg.addEmptyConstructor(Constants.ACC_PUBLIC);
-
- InstructionList il = new InstructionList();
- ConstantPoolGen cp = cg.getConstantPool();
- InstructionFactory factory = new InstructionFactory(cg);
-
- int out = cp.addFieldref("java.lang.System", "out",
- "Ljava/io/PrintStream;");
- int println = cp.addMethodref("java.io.PrintStream", "println",
- "(Ljava/lang/Object;)V");
- MethodGen mg = new MethodGen(Constants.ACC_PUBLIC, Type.VOID,
- new Type[] {
- new ObjectType("java.awt.event.ActionEvent")
- }, null, "actionPerformed", "foo", il, cp);
-
- // System.out.println("actionPerformed:" + event);
- il.append(new GETSTATIC(out));
- il.append(factory.createNew("java.lang.StringBuffer"));
- il.append(InstructionConstants.DUP);
- il.append(new PUSH(cp, "actionPerformed:"));
- il.append(factory.createInvoke("java.lang.StringBuffer", "<init>",
Type.VOID,
- new Type[] {Type.STRING}, Constants.INVOKESPECIAL));
-
- il.append(new ALOAD(1));
- il.append(factory.createAppend(Type.OBJECT));
- il.append(new INVOKEVIRTUAL(println));
- il.append(InstructionConstants.RETURN);
-
- mg.stripAttributes(true);
- mg.setMaxStack();
- mg.setMaxLocals();
- cg.addMethod(mg.getMethod());
-
- byte[] bytes = cg.getJavaClass().getBytes();
-
- System.out.println("Uncompressed class: " + bytes.length);
-
- String s = Utility.encode(bytes, true);
- System.out.println("Encoded class: " + s.length());
-
- System.out.print("Creating proxy ... ");
- ActionListener a = (ActionListener)createProxy("foo.bar.", s);
- System.out.println("Done. Now calling actionPerformed()");
-
- a.actionPerformed(new ActionEvent(a, ActionEvent.ACTION_PERFORMED,
"hello"));
- } else {
- System.err.println("Call me with java org.apache.bcel.util.JavaWrapper
ProxyCreator");
+ /**
+ * Create JavaClass object for a simple proxy for an
java.awt.event.ActionListener
+ * that just prints the passed arguments, load and use it via the class
loader
+ * mechanism.
+ */
+ public static void main(String[] argv) throws Exception {
+ ClassLoader loader = ProxyCreator.class.getClassLoader();
+
+ // instanceof won't work here ...
+ if (loader.getClass().toString().equals("class
org.apache.bcel.util.ClassLoader")) {
+ // Real class name will be set by the class loader
+ ClassGen cg = new ClassGen("foo", "java.lang.Object", "",
Constants.ACC_PUBLIC,
+ new String[]{"java.awt.event.ActionListener"});
+
+ // That's important, otherwise newInstance() won't work
+ cg.addEmptyConstructor(Constants.ACC_PUBLIC);
+
+ InstructionList il = new InstructionList();
+ ConstantPoolGen cp = cg.getConstantPool();
+ InstructionFactory factory = new InstructionFactory(cg);
+
+ int out = cp.addFieldref("java.lang.System", "out",
+ "Ljava/io/PrintStream;");
+ int println = cp.addMethodref("java.io.PrintStream", "println",
+ "(Ljava/lang/Object;)V");
+ MethodGen mg = new MethodGen(Constants.ACC_PUBLIC, Type.VOID,
+ new Type[]{
+ new ObjectType("java.awt.event.ActionEvent")
+ }, null, "actionPerformed", "foo", il, cp);
+
+ // System.out.println("actionPerformed:" + event);
+ il.append(new GETSTATIC(out));
+ il.append(factory.createNew("java.lang.StringBuffer"));
+ il.append(InstructionConstants.DUP);
+ il.append(new PUSH(cp, "actionPerformed:"));
+ il.append(factory.createInvoke("java.lang.StringBuffer", "<init>",
Type.VOID,
+ new Type[]{Type.STRING}, Constants.INVOKESPECIAL));
+
+ il.append(new ALOAD(1));
+ il.append(factory.createAppend(Type.OBJECT));
+ il.append(new INVOKEVIRTUAL(println));
+ il.append(InstructionConstants.RETURN);
+
+ mg.stripAttributes(true);
+ mg.setMaxStack();
+ mg.setMaxLocals();
+ cg.addMethod(mg.getMethod());
+
+ byte[] bytes = cg.getJavaClass().getBytes();
+
+ System.out.println("Uncompressed class: " + bytes.length);
+
+ String s = Utility.encode(bytes, true);
+ System.out.println("Encoded class: " + s.length());
+
+ System.out.print("Creating proxy ... ");
+ ActionListener a = (ActionListener) createProxy("foo.bar.", s);
+ System.out.println("Done. Now calling actionPerformed()");
+
+ a.actionPerformed(new ActionEvent(a, ActionEvent.ACTION_PERFORMED,
"hello"));
+ } else {
+ System.err.println("Call me with java
org.apache.bcel.util.JavaWrapper ProxyCreator");
+ }
}
- }
}
Modified: commons/proper/bcel/trunk/src/examples/TransitiveHull.java
URL:
http://svn.apache.org/viewvc/commons/proper/bcel/trunk/src/examples/TransitiveHull.java?rev=1661091&r1=1661090&r2=1661091&view=diff
==============================================================================
--- commons/proper/bcel/trunk/src/examples/TransitiveHull.java (original)
+++ commons/proper/bcel/trunk/src/examples/TransitiveHull.java Fri Feb 20
11:11:54 2015
@@ -15,8 +15,10 @@
* limitations under the License.
*
*/
+
import java.util.Arrays;
import java.util.regex.Pattern;
+
import org.apache.bcel.Constants;
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.ClassParser;
@@ -46,41 +48,42 @@ import org.apache.bcel.util.ClassSet;
* <p>
* You'll need Apache's regular expression library supplied together with BCEL
* to use this class.
- *
- * @version $Id$
+ *
* @author <A HREF="mailto:[email protected]";>M. Dahm</A>
+ * @version $Id$
*/
public class TransitiveHull extends org.apache.bcel.classfile.EmptyVisitor {
- private ClassQueue _queue;
- private ClassSet _set;
- private ConstantPool _cp;
- private String[] _ignored = IGNORED;
- public static final String[] IGNORED = { "java[.].*",
"javax[.].*", "sun[.].*", "sunw[.].*",
- "com[.]sun[.].*", "org[.]omg[.].*", "org[.]w3c[.].*",
"org[.]xml[.].*", "net[.]jini[.].*" };
+ private ClassQueue queue;
+ private ClassSet set;
+ private ConstantPool cp;
+ private String[] ignored = IGNORED;
+
+ public static final String[] IGNORED = {"java[.].*", "javax[.].*",
"sun[.].*", "sunw[.].*",
+ "com[.]sun[.].*", "org[.]omg[.].*", "org[.]w3c[.].*",
"org[.]xml[.].*", "net[.]jini[.].*"};
public TransitiveHull(JavaClass clazz) {
- _queue = new ClassQueue();
- _queue.enqueue(clazz);
- _set = new ClassSet();
- _set.add(clazz);
+ queue = new ClassQueue();
+ queue.enqueue(clazz);
+ set = new ClassSet();
+ set.add(clazz);
}
public JavaClass[] getClasses() {
- return _set.toArray();
+ return set.toArray();
}
public String[] getClassNames() {
- return _set.getClassNames();
+ return set.getClassNames();
}
/**
* Start traversal using DescendingVisitor pattern.
*/
public void start() {
- while (!_queue.empty()) {
- JavaClass clazz = _queue.dequeue();
- _cp = clazz.getConstantPool();
+ while (!queue.empty()) {
+ JavaClass clazz = queue.dequeue();
+ cp = clazz.getConstantPool();
new org.apache.bcel.classfile.DescendingVisitor(clazz,
this).visit();
}
@@ -89,8 +92,8 @@ public class TransitiveHull extends org.
private void add(String class_name) {
class_name = class_name.replace('/', '.');
- for (int i = 0; i < _ignored.length; i++) {
- if (Pattern.matches(_ignored[i], class_name)) {
+ for (String anIgnored : ignored) {
+ if (Pattern.matches(anIgnored, class_name)) {
return;
}
}
@@ -98,8 +101,8 @@ public class TransitiveHull extends org.
try {
JavaClass clazz = Repository.lookupClass(class_name);
- if (_set.add(clazz)) {
- _queue.enqueue(clazz);
+ if (set.add(clazz)) {
+ queue.enqueue(clazz);
}
} catch (ClassNotFoundException e) {
throw new IllegalStateException("Missing class: " + e.toString());
@@ -108,7 +111,7 @@ public class TransitiveHull extends org.
@Override
public void visitConstantClass(ConstantClass cc) {
- String class_name = (String) cc.getConstantValue(_cp);
+ String class_name = (String) cc.getConstantValue(cp);
add(class_name);
}
@@ -123,23 +126,21 @@ public class TransitiveHull extends org.
}
private void visitRef(ConstantCP ccp, boolean method) {
- String class_name = ccp.getClass(_cp);
+ String class_name = ccp.getClass(cp);
add(class_name);
- ConstantNameAndType cnat = (ConstantNameAndType)
_cp.getConstant(ccp.getNameAndTypeIndex(),
+ ConstantNameAndType cnat = (ConstantNameAndType)
cp.getConstant(ccp.getNameAndTypeIndex(),
Constants.CONSTANT_NameAndType);
- String signature = cnat.getSignature(_cp);
+ String signature = cnat.getSignature(cp);
if (method) {
Type type = Type.getReturnType(signature);
checkType(type);
- Type[] types = Type.getArgumentTypes(signature);
-
- for (int i = 0; i < types.length; i++) {
- checkType(types[i]);
+ for (Type type1 : Type.getArgumentTypes(signature)) {
+ checkType(type1);
}
} else {
checkType(Type.getType(signature));
@@ -162,17 +163,16 @@ public class TransitiveHull extends org.
}
public String[] getIgnored() {
- return _ignored;
+ return ignored;
}
/**
- * Set the value of _ignored.
- *
- * @param v
- * Value to assign to _ignored.
+ * Set the value of ignored.
+ *
+ * @param v Value to assign to ignored.
*/
public void setIgnored(String[] v) {
- _ignored = v;
+ ignored = v;
}
public static void main(String[] argv) {
Modified: commons/proper/bcel/trunk/src/examples/helloify.java
URL:
http://svn.apache.org/viewvc/commons/proper/bcel/trunk/src/examples/helloify.java?rev=1661091&r1=1661090&r2=1661091&view=diff
==============================================================================
--- commons/proper/bcel/trunk/src/examples/helloify.java (original)
+++ commons/proper/bcel/trunk/src/examples/helloify.java Fri Feb 20 11:11:54
2015
@@ -15,6 +15,7 @@
* limitations under the License.
*
*/
+
import org.apache.bcel.Constants;
import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.classfile.Code;
@@ -37,108 +38,99 @@ import org.apache.bcel.generic.PUSH;
* Read class file(s) and patch all of its methods, so that they print
* "hello" and their name and signature before doing anything else.
*
- * @version $Id$
* @author <A HREF="mailto:[email protected]";>M. Dahm</A>
+ * @version $Id$
*/
public final class helloify implements Constants {
- private static String class_name;
- private static ConstantPoolGen cp;
- private static int out; // reference to System.out
- private static int println; // reference to PrintStream.println
-
- public static void main(String[] argv) {
- try {
- for(int i=0; i < argv.length; i++) {
- if(argv[i].endsWith(".class")) {
- JavaClass java_class = new ClassParser(argv[i]).parse();
- ConstantPool constants = java_class.getConstantPool();
- String file_name = argv[i].substring(0, argv[i].length() -
6) +
- "_hello.class";
- cp = new ConstantPoolGen(constants);
-
- helloifyClassName(java_class);
-
- out = cp.addFieldref("java.lang.System", "out",
- "Ljava/io/PrintStream;");
- println = cp.addMethodref("java.io.PrintStream", "println",
- "(Ljava/lang/String;)V");
- /* Patch all methods.
- */
- Method[] methods = java_class.getMethods();
- for(int j=0; j < methods.length; j++) {
- methods[j] = helloifyMethod(methods[j]);
+ private static String class_name;
+ private static ConstantPoolGen cp;
+ private static int out; // reference to System.out
+ private static int println; // reference to PrintStream.println
+
+ public static void main(String[] argv) throws Exception {
+ for (String arg : argv) {
+ if (arg.endsWith(".class")) {
+ JavaClass java_class = new ClassParser(arg).parse();
+ ConstantPool constants = java_class.getConstantPool();
+ String file_name = arg.substring(0, arg.length() - 6) +
"_hello.class";
+ cp = new ConstantPoolGen(constants);
+
+ helloifyClassName(java_class);
+
+ out = cp.addFieldref("java.lang.System", "out",
"Ljava/io/PrintStream;");
+ println = cp.addMethodref("java.io.PrintStream", "println",
"(Ljava/lang/String;)V");
+ // Patch all methods.
+ Method[] methods = java_class.getMethods();
+
+ for (int j = 0; j < methods.length; j++) {
+ methods[j] = helloifyMethod(methods[j]);
+ }
+
+ // Finally dump it back to a file.
+ java_class.setConstantPool(cp.getFinalConstantPool());
+ java_class.dump(file_name);
+ }
+ }
}
- /* Finally dump it back to a file.
- */
- java_class.setConstantPool(cp.getFinalConstantPool());
- java_class.dump(file_name);
- }
- }
- } catch(Exception e) {
- e.printStackTrace();
- }
- }
-
- /** Change class name to <old_name>_hello
- */
- private static void helloifyClassName(JavaClass java_class ) {
- class_name = java_class.getClassName() + "_hello";
- int index = java_class.getClassNameIndex();
-
- index = ((ConstantClass)cp.getConstant(index)).getNameIndex();
- cp.setConstant(index, new ConstantUtf8(class_name.replace('.', '/')));
- }
-
- /**
- * Patch a method.
- */
- private static Method helloifyMethod(Method m) {
- Code code = m.getCode();
- int flags = m.getAccessFlags();
- String name = m.getName();
-
- // Sanity check
- if(m.isNative() || m.isAbstract() || (code == null)) {
- return m;
- }
-
- /* Create instruction list to be inserted at method start.
+ /**
+ * Change class name to <old_name>_hello
*/
- String mesg = "Hello from " +
Utility.methodSignatureToString(m.getSignature(),
- name,
- Utility.accessToString(flags));
- InstructionList patch = new InstructionList();
- patch.append(new GETSTATIC(out));
- patch.append(new PUSH(cp, mesg));
- patch.append(new INVOKEVIRTUAL(println));
-
- MethodGen mg = new MethodGen(m, class_name, cp);
- InstructionList il = mg.getInstructionList();
- InstructionHandle[] ihs = il.getInstructionHandles();
-
- if(name.equals("<init>")) { // First let the super or other constructor be
called
- for(int j=1; j < ihs.length; j++) {
- if(ihs[j].getInstruction() instanceof INVOKESPECIAL) {
- il.append(ihs[j], patch); // Should check: method name == "<init>"
- break;
- }
- }
- } else {
- il.insert(ihs[0], patch);
+ private static void helloifyClassName(JavaClass java_class) {
+ class_name = java_class.getClassName() + "_hello";
+ int index = java_class.getClassNameIndex();
+
+ index = ((ConstantClass) cp.getConstant(index)).getNameIndex();
+ cp.setConstant(index, new ConstantUtf8(class_name.replace('.', '/')));
}
- /* Stack size must be at least 2, since the println method takes 2
argument.
+ /**
+ * Patch a method.
*/
- if(code.getMaxStack() < 2) {
- mg.setMaxStack(2);
- }
+ private static Method helloifyMethod(Method m) {
+ Code code = m.getCode();
+ int flags = m.getAccessFlags();
+ String name = m.getName();
+
+ // Sanity check
+ if (m.isNative() || m.isAbstract() || (code == null)) {
+ return m;
+ }
+
+ // Create instruction list to be inserted at method start.
+ String mesg = "Hello from " +
Utility.methodSignatureToString(m.getSignature(),
+ name,
+ Utility.accessToString(flags));
+ InstructionList patch = new InstructionList();
+ patch.append(new GETSTATIC(out));
+ patch.append(new PUSH(cp, mesg));
+ patch.append(new INVOKEVIRTUAL(println));
+
+ MethodGen mg = new MethodGen(m, class_name, cp);
+ InstructionList il = mg.getInstructionList();
+ InstructionHandle[] ihs = il.getInstructionHandles();
+
+ if (name.equals("<init>")) { // First let the super or other
constructor be called
+ for (int j = 1; j < ihs.length; j++) {
+ if (ihs[j].getInstruction() instanceof INVOKESPECIAL) {
+ il.append(ihs[j], patch); // Should check: method name ==
"<init>"
+ break;
+ }
+ }
+ } else {
+ il.insert(ihs[0], patch);
+ }
+
+ // Stack size must be at least 2, since the println method takes 2
argument.
+ if (code.getMaxStack() < 2) {
+ mg.setMaxStack(2);
+ }
- m = mg.getMethod();
+ m = mg.getMethod();
- il.dispose(); // Reuse instruction handles
-
- return m;
- }
+ il.dispose(); // Reuse instruction handles
+
+ return m;
+ }
}
Modified: commons/proper/bcel/trunk/src/examples/id.java
URL:
http://svn.apache.org/viewvc/commons/proper/bcel/trunk/src/examples/id.java?rev=1661091&r1=1661090&r2=1661091&view=diff
==============================================================================
--- commons/proper/bcel/trunk/src/examples/id.java (original)
+++ commons/proper/bcel/trunk/src/examples/id.java Fri Feb 20 11:11:54 2015
@@ -15,6 +15,7 @@
* limitations under the License.
*
*/
+
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.classfile.Field;
@@ -31,39 +32,36 @@ import org.apache.bcel.generic.MethodGen
*
* Try to:
* <pre>
-% java id <someclass>
-% java listclass -code <someclass> > foo
-% java listclass -code <someclass>.clazz > bar
-% diff foo bar | more
+ * % java id <someclass>
+ * % java listclass -code <someclass> > foo
+ * % java listclass -code <someclass>.clazz > bar
+ * % diff foo bar | more
* <pre>
*
- * @version $Id$
* @author <A HREF="mailto:[email protected]";>M. Dahm</A>
+ * @version $Id$
*/
public class id {
- public static void main(String[] argv) throws Exception {
- JavaClass clazz = null;
-
- if((clazz = Repository.lookupClass(argv[0])) == null) {
- clazz = new ClassParser(argv[0]).parse(); // May throw IOException
- }
- ClassGen cg = new ClassGen(clazz);
+ public static void main(String[] argv) throws Exception {
+ JavaClass clazz;
- Method[] methods = clazz.getMethods();
+ if ((clazz = Repository.lookupClass(argv[0])) == null) {
+ clazz = new ClassParser(argv[0]).parse(); // May throw IOException
+ }
+
+ ClassGen cg = new ClassGen(clazz);
+
+ for (Method method : clazz.getMethods()) {
+ MethodGen mg = new MethodGen(method, cg.getClassName(),
cg.getConstantPool());
+ cg.replaceMethod(method, mg.getMethod());
+ }
+
+ for (Field field : clazz.getFields()) {
+ FieldGen fg = new FieldGen(field, cg.getConstantPool());
+ cg.replaceField(field, fg.getField());
+ }
- for(int i=0; i < methods.length; i++) {
- MethodGen mg = new MethodGen(methods[i], cg.getClassName(),
cg.getConstantPool());
- cg.replaceMethod(methods[i], mg.getMethod());
+ cg.getJavaClass().dump(clazz.getClassName() + ".clazz");
}
-
- Field[] fields = clazz.getFields();
-
- for(int i=0; i < fields.length; i++) {
- FieldGen fg = new FieldGen(fields[i], cg.getConstantPool());
- cg.replaceField(fields[i], fg.getField());
- }
-
- cg.getJavaClass().dump(clazz.getClassName() + ".clazz");
- }
}
