Example usage for org.objectweb.asm Opcodes LDC

Introduction

In this page you can find the example usage for org.objectweb.asm Opcodes LDC.

Prototype

int LDC

To view the source code for org.objectweb.asm Opcodes LDC.

Click Source Link

Usage

From source file:com.codename1.tools.translator.bytecodes.Ldc.java

License:Open Source License

public Ldc(Object o) {
    super(Opcodes.LDC);
    cst = o;
}

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From source file:com.gargoylesoftware.js.nashorn.internal.ir.debug.NashornTextifier.java

License:Open Source License

@Override
public void visitLdcInsn(final Object cst) {
    final StringBuilder sb = new StringBuilder();
    appendOpcode(sb, Opcodes.LDC).append(' ');
    if (cst instanceof String) {
        appendStr(sb, (String) cst);
    } else if (cst instanceof Type) {
        sb.append(((Type) cst).getDescriptor()).append(".class");
    } else {/*from w w  w.j  a  va  2 s  .  c  om*/
        sb.append(cst);
    }
    sb.append('\n');
    addText(sb);
}

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From source file:com.googlecode.dex2jar.tools.DecryptStringCmd.java

License:Apache License

@Override
protected void doCommandLine() throws Exception {
    if (remainingArgs.length != 1) {
        usage();/*from ww  w  .  j av a  2s  .  c o  m*/
        return;
    }

    final Path jar = new File(remainingArgs[0]).toPath();
    if (!Files.exists(jar)) {
        System.err.println(jar + " is not exists");
        return;
    }
    if (methodName == null || methodOwner == null) {
        System.err.println("Please set --decrypt-method-owner and --decrypt-method-name");
        return;
    }

    if (output == null) {
        if (Files.isDirectory(jar)) {
            output = new File(jar.getFileName() + "-decrypted.jar").toPath();
        } else {
            output = new File(getBaseName(jar.getFileName().toString()) + "-decrypted.jar").toPath();
        }
    }

    if (Files.exists(output) && !forceOverwrite) {
        System.err.println(output + " exists, use --force to overwrite");
        return;
    }

    System.err.println(jar + " -> " + output);

    List<String> list = new ArrayList<String>();
    if (classpath != null) {
        list.addAll(Arrays.asList(classpath.split(";|:")));
    }
    list.add(jar.toAbsolutePath().toString());
    URL[] urls = new URL[list.size()];
    for (int i = 0; i < list.size(); i++) {
        urls[i] = new File(list.get(i)).toURI().toURL();
    }
    final Method jmethod;
    try {
        URLClassLoader cl = new URLClassLoader(urls);
        jmethod = cl.loadClass(methodOwner).getMethod(methodName, String.class);
        jmethod.setAccessible(true);
    } catch (Exception ex) {
        System.err.println("can't load method: String " + methodOwner + "." + methodName + "(String), message:"
                + ex.getMessage());
        return;
    }
    final String methodOwnerInternalType = this.methodOwner.replace('.', '/');
    try (FileSystem outputFileSystem = createZip(output)) {
        final Path outputBase = outputFileSystem.getPath("/");
        walkJarOrDir(jar, new FileVisitorX() {
            @Override
            public void visitFile(Path file, Path relative) throws IOException {
                if (file.getFileName().toString().endsWith(".class")) {

                    ClassReader cr = new ClassReader(Files.readAllBytes(file));
                    ClassNode cn = new ClassNode();
                    cr.accept(cn, 0);

                    for (Object m0 : cn.methods) {
                        MethodNode m = (MethodNode) m0;
                        if (m.instructions == null) {
                            continue;
                        }
                        AbstractInsnNode p = m.instructions.getFirst();
                        while (p != null) {
                            if (p.getOpcode() == Opcodes.LDC) {
                                LdcInsnNode ldc = (LdcInsnNode) p;
                                if (ldc.cst instanceof String) {
                                    String v = (String) ldc.cst;
                                    AbstractInsnNode q = p.getNext();
                                    if (q.getOpcode() == Opcodes.INVOKESTATIC) {
                                        MethodInsnNode mn = (MethodInsnNode) q;
                                        if (mn.name.equals(methodName)
                                                && mn.desc.equals("(Ljava/lang/String;)Ljava/lang/String;")
                                                && mn.owner.equals(methodOwnerInternalType)) {
                                            try {
                                                Object newValue = jmethod.invoke(null, v);
                                                ldc.cst = newValue;
                                            } catch (Exception e) {
                                                // ignore
                                            }
                                            m.instructions.remove(q);
                                        }
                                    }
                                }
                            }
                            p = p.getNext();
                        }
                    }

                    ClassWriter cw = new ClassWriter(0);
                    cn.accept(cw);
                    Files.write(outputBase.resolve(relative), cw.toByteArray());
                } else {
                    Files.copy(file, outputBase.resolve(relative));
                }
            }
        });
    }
}

---

From source file:com.liferay.portal.nio.intraband.proxy.IntrabandProxyUtilTest.java

License:Open Source License

@Test
public void testRewriteGetProxyMethodSignaturesMethodNode() {
    class TestClass {

        @SuppressWarnings("unused")
        public final String[] PROXY_METHOD_SIGNATURES = _getProxyMethodSignatures();

        private String[] _getProxyMethodSignatures() {
            return new String[0];
        }//from   ww  w. j  ava 2  s.c o  m
    }

    ClassNode classNode = _loadClass(TestClass.class);

    String[] proxyMethodSignatures = { "testSignature1", "testSignature2", "testSignature3" };

    IntrabandProxyUtil.rewriteGetProxyMethodSignaturesMethodNode(classNode, proxyMethodSignatures);

    MethodNode methodNode = ASMUtil.findMethodNode(classNode.methods, "_getProxyMethodSignatures",
            Type.getType(String[].class));

    InsnList insnList = methodNode.instructions;

    Iterator<AbstractInsnNode> iterator = insnList.iterator();

    _assertInsnNode(iterator.next(), Opcodes.ICONST_3);

    _assertTypeInsnNode(iterator.next(), Opcodes.ANEWARRAY, String.class);

    for (int i = 0; i < proxyMethodSignatures.length; i++) {
        _assertInsnNode(iterator.next(), Opcodes.DUP);
        _assertInsnNode(iterator.next(), Opcodes.ICONST_0 + i);
        _assertLdcInsnNode(iterator.next(), Opcodes.LDC, proxyMethodSignatures[i]);
        _assertInsnNode(iterator.next(), Opcodes.AASTORE);
    }

    _assertInsnNode(iterator.next(), Opcodes.ARETURN);

    Assert.assertFalse(iterator.hasNext());
}

---

From source file:com.liferay.portal.nio.intraband.proxy.IntrabandProxyUtilTest.java

License:Open Source License

private void _doTestCreateProxyMethodNode(Method method, int index, String skeletonId,
        String stubInternalName) {

    MethodNode proxyMethodNode = IntrabandProxyUtil.createProxyMethodNode(method, index, skeletonId,
            Type.getType(stubInternalName));

    _assertMethodNodeSignature(proxyMethodNode, method.getModifiers() & ~Modifier.ABSTRACT, method.getName(),
            Type.getMethodDescriptor(method), method.getExceptionTypes());

    InsnList insnList = proxyMethodNode.instructions;

    Iterator<AbstractInsnNode> iterator = insnList.iterator();

    // NEW com/liferay/portal/kernel/io/Serializer

    _assertTypeInsnNode(iterator.next(), Opcodes.NEW, Serializer.class);

    // DUP//from   w ww  .  j av  a 2 s  .c om

    _assertInsnNode(iterator.next(), Opcodes.DUP);

    // INVOKESPECIAL com/liferay/portal/kernel/io/Serializer <init> ()V

    _assertMethodInsnNode(iterator.next(), Opcodes.INVOKESPECIAL, Type.getInternalName(Serializer.class),
            "<init>", Type.VOID_TYPE);

    // ASTORE argumentsSize

    Type methodType = Type.getType(method);

    int argumentsAndReturnSizes = methodType.getArgumentsAndReturnSizes();

    int argumentsSize = argumentsAndReturnSizes >> 2;

    _assertVarInsnNode(iterator.next(), Opcodes.ASTORE, argumentsSize);

    // ALOAD argumentsSize

    _assertVarInsnNode(iterator.next(), Opcodes.ALOAD, argumentsSize);

    // LDC skeletonId

    _assertLdcInsnNode(iterator.next(), Opcodes.LDC, skeletonId);

    // INVOKEVIRTUAL com/liferay/portal/kernel/io/Serializer writeString
    // (Ljava/lang/String;)V

    _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL, Type.getInternalName(Serializer.class),
            "writeString", Type.VOID_TYPE, Type.getType(String.class));

    // ALOAD argumentsSize

    _assertVarInsnNode(iterator.next(), Opcodes.ALOAD, argumentsSize);

    // ALOAD 0

    _assertVarInsnNode(iterator.next(), Opcodes.ALOAD, 0);

    // GETFIELD stubInternalName _id Ljava/lang/String;

    _assertFieldInsnNode(iterator.next(), Opcodes.GETFIELD, stubInternalName, "_id", String.class);

    // INVOKEVIRTUAL com/liferay/portal/kernel/io/Serializer writeString
    // (Ljava/lang/String;)V

    _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL, Type.getInternalName(Serializer.class),
            "writeString", Type.VOID_TYPE, Type.getType(String.class));

    // ALOAD argumentsSize

    _assertVarInsnNode(iterator.next(), Opcodes.ALOAD, argumentsSize);

    if (index <= 5) {

        // ICONST_index

        _assertInsnNode(iterator.next(), Opcodes.ICONST_0 + index);
    } else {

        // BIPUSH index

        _assertIntInsnNode(iterator.next(), Opcodes.BIPUSH, index);
    }

    // INVOKEVIRTUAL com/liferay/portal/kernel/io/Serializer writeInt (I)V

    _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL, Type.getInternalName(Serializer.class),
            "writeInt", Type.VOID_TYPE, Type.INT_TYPE);

    Class<?>[] parameterTypes = method.getParameterTypes();

    int offset = 1;

    for (int i = 0; i < parameterTypes.length; i++) {
        Class<?> parameterClass = parameterTypes[i];

        // ALOAD argumentsSize

        _assertVarInsnNode(iterator.next(), Opcodes.ALOAD, argumentsSize);

        // xLOAD i

        Type parameterType = Type.getType(parameterClass);

        _assertVarInsnNode(iterator.next(), parameterType.getOpcode(Opcodes.ILOAD), offset);

        offset += parameterType.getSize();

        if (parameterClass.isPrimitive() || (parameterClass == String.class)) {

            String name = TextFormatter.format(parameterClass.getSimpleName(), TextFormatter.G);

            _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL,
                    Type.getInternalName(Serializer.class), "write".concat(name), Type.VOID_TYPE,
                    parameterType);
        } else {
            _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL,
                    Type.getInternalName(Serializer.class), "writeObject", Type.VOID_TYPE,
                    Type.getType(Serializable.class));
        }
    }

    // ALOAD 0

    _assertVarInsnNode(iterator.next(), Opcodes.ALOAD, 0);

    // ALOAD argumentsSize

    _assertVarInsnNode(iterator.next(), Opcodes.ALOAD, argumentsSize);

    Class<?> returnClass = method.getReturnType();

    Type returnType = Type.getType(returnClass);

    if (returnClass == void.class) {

        // INVOKESPECIAL stubInternalName _send
        // (Lcom/liferay/portal/kernel/io/Serializer;)V

        _assertMethodInsnNode(iterator.next(), Opcodes.INVOKESPECIAL, stubInternalName, "_send", Type.VOID_TYPE,
                Type.getType(Serializer.class));

        _assertInsnNode(iterator.next(), Opcodes.RETURN);
    } else {

        // INVOKESPECIAL stubInternalName _syncSend
        // (Lcom/liferay/portal/kernel/io/Serializer;)Ljava/io/Serializable;

        _assertMethodInsnNode(iterator.next(), Opcodes.INVOKESPECIAL, stubInternalName, "_syncSend",
                Type.getType(Serializable.class), Type.getType(Serializer.class));

        if (returnClass.isPrimitive()) {

            // ASTORE argumentsSize + 1

            _assertVarInsnNode(iterator.next(), Opcodes.ASTORE, argumentsSize + 1);

            // ALOAD argumentsSize + 1

            _assertVarInsnNode(iterator.next(), Opcodes.ALOAD, argumentsSize + 1);

            // IFNULL nullCheckLabel

            LabelNode nullCheckLabelNode = _assertJumpInsnNode(iterator.next(), Opcodes.IFNULL);

            // ALOAD argumentsSize + 1

            _assertVarInsnNode(iterator.next(), Opcodes.ALOAD, argumentsSize + 1);

            // CHECKCAST returnType

            _assertTypeInsnNode(iterator.next(), Opcodes.CHECKCAST, _autoboxingMap.get(returnClass));

            if (returnClass == boolean.class) {

                // INVOKEVIRTUAL java/lang/Boolean booleanValue ()Z

                _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL,
                        Type.getInternalName(Boolean.class), "booleanValue", Type.BOOLEAN_TYPE);
            } else if (returnClass == byte.class) {

                // INVOKEVIRTUAL java/lang/Number intValue ()I

                _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL,
                        Type.getInternalName(Number.class), "intValue", Type.INT_TYPE);
            } else if (returnClass == char.class) {

                // INVOKEVIRTUAL java/lang/Character charValue ()C

                _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL,
                        Type.getInternalName(Character.class), "charValue", Type.CHAR_TYPE);
            } else if (returnClass == double.class) {

                // INVOKEVIRTUAL java/lang/Number doubleValue ()D

                _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL,
                        Type.getInternalName(Number.class), "doubleValue", Type.DOUBLE_TYPE);
            } else if (returnClass == float.class) {

                // INVOKEVIRTUAL java/lang/Number floatValue ()F

                _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL,
                        Type.getInternalName(Number.class), "floatValue", Type.FLOAT_TYPE);
            } else if (returnClass == int.class) {

                // INVOKEVIRTUAL java/lang/Number intValue ()I

                _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL,
                        Type.getInternalName(Number.class), "intValue", Type.INT_TYPE);
            } else if (returnClass == long.class) {

                // INVOKEVIRTUAL java/lang/Number longValue ()J

                _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL,
                        Type.getInternalName(Number.class), "longValue", Type.LONG_TYPE);
            } else if (returnClass == short.class) {

                // INVOKEVIRTUAL java/lang/Number intValue ()I

                _assertMethodInsnNode(iterator.next(), Opcodes.INVOKEVIRTUAL,
                        Type.getInternalName(Number.class), "intValue", Type.INT_TYPE);
            }

            // xRETURN

            _assertInsnNode(iterator.next(), returnType.getOpcode(Opcodes.IRETURN));

            // nullCheckLabel

            Assert.assertSame(nullCheckLabelNode, iterator.next());

            // xRETURN null/0

            if (!returnClass.isPrimitive()) {
                _assertInsnNode(iterator.next(), Opcodes.ACONST_NULL);
                _assertInsnNode(iterator.next(), Opcodes.ARETURN);
            } else if (returnClass == void.class) {
                _assertInsnNode(iterator.next(), Opcodes.RETURN);
            } else if (returnClass == float.class) {
                _assertInsnNode(iterator.next(), Opcodes.FCONST_0);
                _assertInsnNode(iterator.next(), Opcodes.FRETURN);
            } else if (returnClass == double.class) {
                _assertInsnNode(iterator.next(), Opcodes.DCONST_0);
                _assertInsnNode(iterator.next(), Opcodes.DRETURN);
            } else if (returnClass == long.class) {
                _assertInsnNode(iterator.next(), Opcodes.LCONST_0);
                _assertInsnNode(iterator.next(), Opcodes.LRETURN);
            } else {
                _assertInsnNode(iterator.next(), Opcodes.ICONST_0);
                _assertInsnNode(iterator.next(), Opcodes.IRETURN);
            }
        } else {
            if (returnClass != Object.class) {

                // CHECKCAST

                _assertTypeInsnNode(iterator.next(), Opcodes.CHECKCAST, returnClass);
            }

            // ARETURN

            _assertInsnNode(iterator.next(), Opcodes.ARETURN);
        }
    }

    Assert.assertFalse(iterator.hasNext());
}

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From source file:com.mebigfatguy.baremetal4j.Sourcifier.java

License:Apache License

public void visitLdcInsn(Object cst) {
    lines.add("\t\tBCO = " + String.format("%05d", byteOffset) + "; // " + Printer.OPCODES[Opcodes.LDC] + " "
            + cst);/*from   www.j  av a2 s.  c o  m*/
    byteOffset += 2;
}

---

From source file:com.microsoft.Malmo.OverclockingClassTransformer.java

License:Open Source License

private static void overclockServer(ClassNode node, boolean isObfuscated) {
    // We're attempting to replace this code (from the heart of MinecraftServer.run):
    /*       /*from w w  w .  jav  a 2 s  . c  o m*/
    {
        while (i > 50L)
        {
            i -= 50L;
            this.tick();
        }
    }
            
    Thread.sleep(Math.max(1L, 50L - i));
    */

    // With this:
    /*       
    {
    while (i > TimeHelper.serverTickLength)
    {
        i -= TimeHelper.serverTickLength;
        this.tick();
    }
    }
            
    Thread.sleep(Math.max(1L, TimeHelper.serverTickLength - i));
    */
    // This allows us to alter the tick length via TimeHelper.

    final String methodName = "run";
    final String methodDescriptor = "()V"; // No params, returns void.

    System.out.println("MALMO: Found MinecraftServer, attempting to transform it");

    for (MethodNode method : node.methods) {
        if (method.name.equals(methodName) && method.desc.equals(methodDescriptor)) {
            System.out.println("MALMO: Found MinecraftServer.run() method, attempting to transform it");
            for (AbstractInsnNode instruction : method.instructions.toArray()) {
                if (instruction.getOpcode() == Opcodes.LDC) {
                    Object cst = ((LdcInsnNode) instruction).cst;
                    if ((cst instanceof Long) && (Long) cst == 50) {
                        System.out.println("MALMO: Transforming LDC");
                        AbstractInsnNode replacement = new FieldInsnNode(Opcodes.GETSTATIC,
                                "com/microsoft/Malmo/Utils/TimeHelper", "serverTickLength", "J");
                        method.instructions.set(instruction, replacement);
                    }
                }
            }
        }
    }
}

---

From source file:de.loskutov.bco.asm.CommentedASMifierClassVisitor.java

License:Open Source License

@Override
public void visitLdcInsn(final Object cst) {
    addIndex(Opcodes.LDC);
    super.visitLdcInsn(cst);
}

---

From source file:de.unisb.cs.st.javaslicer.common.classRepresentation.instructions.LdcInstruction.java

License:Open Source License

public LdcInstruction(final ReadMethod readMethod, final int lineNumber, final Object constant) {
    super(readMethod, Opcodes.LDC, lineNumber);
    assert constant instanceof Number || constant instanceof String
            || constant instanceof org.objectweb.asm.Type;
    this.constant = constant;
    this.isLongObject = constant instanceof Long || constant instanceof Double;
}

---

From source file:de.unisb.cs.st.javaslicer.common.classRepresentation.instructions.LdcInstruction.java

License:Open Source License

private LdcInstruction(final ReadMethod readMethod, final int lineNumber, final Object constant,
        final int index) {
    super(readMethod, Opcodes.LDC, lineNumber, index);
    assert constant instanceof Number || constant instanceof String
            || constant instanceof org.objectweb.asm.Type;
    this.constant = constant;
    this.isLongObject = constant instanceof Long || constant instanceof Double;
}

---

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