Example usage for org.objectweb.asm Label Label

List of usage examples for org.objectweb.asm Label Label

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Introduction

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

Prototype

public Label()

Source Link

Document

Constructs a new label.

Usage

From source file:co.paralleluniverse.fibers.instrument.InstrumentMethod.java

License:Open Source License

private void emitPopMethod(MethodVisitor mv) {
    //        emitVerifyInstrumentation(mv);

    final Label lbl = new Label();
    if (DUAL) {/*from www . j av a 2s  .c  om*/
        mv.visitVarInsn(Opcodes.ALOAD, lvarStack);
        mv.visitJumpInsn(Opcodes.IFNULL, lbl);
    }

    mv.visitVarInsn(Opcodes.ALOAD, lvarStack);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, STACK_NAME, "popMethod", "()V");

    if (DUAL)
        mv.visitLabel(lbl);
}

From source file:co.paralleluniverse.fibers.instrument.LabelSuspendableCallSitesClassVisitor.java

License:Open Source License

@Override
public MethodVisitor visitMethod(final int access, final String name, final String desc, final String signature,
        final String[] exceptions) {
    if ((access & Opcodes.ACC_NATIVE) == 0 && !isYieldMethod(className, name)) {
        // Bytecode-level AST of a method, being a MethodVisitor itself can be filled through delegation from another visitor
        // Analyze, fill and enqueue method ASTs
        final MethodVisitor outMV = super.visitMethod(access, name, desc, signature, exceptions);

        return new MethodVisitor(ASMAPI, outMV) {
            private int currLineNumber = -1;

            @Override/* ww  w.  j  av a 2s .  c o  m*/
            public void visitLineNumber(int i, Label label) {
                currLineNumber = i;
                super.visitLineNumber(i, label);
            }

            @Override
            public void visitMethodInsn(int opcode, String owner, String name, String desc,
                    boolean isInterface) {
                final int type = AbstractInsnNode.METHOD_INSN;
                if (InstrumentMethod.isSuspendableCall(db, type, opcode, owner, name, desc)) {
                    final Label l = new Label();
                    super.visitLabel(l);
                    super.visitLineNumber(currLineNumber, l); // Force label
                }
                super.visitMethodInsn(opcode, owner, name, desc, isInterface);
            }

            @Override
            public void visitInvokeDynamicInsn(String name, String desc, Handle handle, Object... objects) {
                final int type = AbstractInsnNode.INVOKE_DYNAMIC_INSN;
                final int opcode = Opcodes.INVOKEDYNAMIC;
                if (InstrumentMethod.isSuspendableCall(db, type, opcode, handle.getOwner(), name, desc)) {
                    final Label l = new Label();
                    super.visitLabel(l);
                    super.visitLineNumber(currLineNumber, l); // Force label
                }
                super.visitInvokeDynamicInsn(name, desc, handle, objects);
            }
        };
    }
    return super.visitMethod(access, name, desc, signature, exceptions);
}

From source file:com.alibaba.hotswap.processor.constructor.ConstructorVisitor.java

License:Open Source License

@SuppressWarnings({ "unchecked" })
private void addUniformConstructor(ClassMeta classMeta) {
    int access = Opcodes.ACC_PUBLIC + Opcodes.ACC_SYNTHETIC;
    String name = HotswapConstants.INIT;
    String desc = HotswapConstants.UNIFORM_CONSTRUCTOR_DESC;

    MethodVisitor hotswapInit = new ConstructorInvokeModifier(cv.visitMethod(access, name, desc, null, null),
            access, name, desc);/* w w w. j  av a  2  s  .c o m*/
    GeneratorAdapter hotswapInitAdapter = new GeneratorAdapter(hotswapInit, access, name, desc);

    hotswapInitAdapter.visitCode();

    TreeMap<MethodMeta, MethodNode> initMethodMap = new TreeMap<MethodMeta, MethodNode>(
            new ConstructorIndexComparator());

    for (MethodNode node : initNodes.values()) {
        MethodMeta meta = new MethodMeta(node.access, node.name, node.desc, node.signature,
                ((String[]) node.exceptions.toArray(new String[node.exceptions.size()])));
        meta.setIndex(HotswapMethodIndexHolder.getMethodIndex(className, node.name, node.desc));
        classMeta.refreshInitMeta(meta, true);
        initMethodMap.put(meta, node);
    }

    List<MethodMeta> keys = new ArrayList<MethodMeta>(initMethodMap.keySet());
    List<MethodNode> values = new ArrayList<MethodNode>(initMethodMap.values());

    Label defaultLabel = new Label();
    int[] indexes = new int[keys.size()];
    Label[] labels = new Label[keys.size()];

    for (int i = 0; i < keys.size(); i++) {
        indexes[i] = keys.get(i).getIndex();
        labels[i] = new Label();
    }

    for (int i = 0; i < values.size(); i++) {
        MethodNode node = values.get(i);
        for (int j = 0; j < node.tryCatchBlocks.size(); j++) {
            ((TryCatchBlockNode) node.tryCatchBlocks.get(j)).accept(hotswapInitAdapter);
        }
    }

    hotswapInitAdapter.loadArg(1);
    hotswapInitAdapter.visitLookupSwitchInsn(defaultLabel, indexes, labels);

    for (int i = 0; i < keys.size(); i++) {
        MethodMeta methodMeta = keys.get(i);
        hotswapInitAdapter.visitLabel(labels[i]);
        MethodNode node = values.get(i);

        storeArgs(hotswapInitAdapter, hotswapInit, methodMeta);
        MethodVisitor methodVisitor = new ConstructorLVTAdjustModifier(hotswapInit, 3);

        node.instructions.accept(methodVisitor);

        for (int j = 0; j < (node.localVariables == null ? 0 : node.localVariables.size()); j++) {
            ((LocalVariableNode) node.localVariables.get(j)).accept(methodVisitor);
        }
    }
    hotswapInitAdapter.mark(defaultLabel);

    hotswapInitAdapter.push(this.className);
    hotswapInitAdapter.loadArg(1);
    hotswapInitAdapter.invokeStatic(Type.getType(HotswapMethodUtil.class),
            Method.getMethod("Throwable noSuchMethodError(String, int)"));
    hotswapInitAdapter.throwException();
    hotswapInitAdapter.endMethod();
}

From source file:com.alibaba.hotswap.processor.jdk.classloader.modifier.DefineClassMethodModifier.java

License:Open Source License

@Override
public void visitCode() {
    super.visitCode();

    mv.visitVarInsn(Opcodes.ALOAD, 1);//from   www.  j a  v  a  2 s.c  om
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapConfiguration.class),
            "getClassPathInWorkspace", "(Ljava/lang/String;)Ljava/lang/String;");
    mv.visitInsn(Opcodes.DUP);
    Label old = new Label();
    mv.visitJumpInsn(Opcodes.IFNULL, old);

    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapRuntime.class), "updateClassMeta",
            "(Ljava/lang/String;Ljava/lang/ClassLoader;)V");

    mv.visitVarInsn(Opcodes.ALOAD, 1); // className
    mv.visitInsn(Opcodes.SWAP);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(CustomerLoadClassBytes.class),
            "loadBytesFromPath", "(Ljava/lang/String;Ljava/lang/String;)[B");
    mv.visitVarInsn(Opcodes.ASTORE, 2);// store class bytes into 2
    mv.visitVarInsn(Opcodes.ALOAD, 2);// load class bytes
    mv.visitInsn(Opcodes.ARRAYLENGTH); // length of the class bytes
    mv.visitVarInsn(Opcodes.ISTORE, 4);// store length into 4

    Label end = new Label();
    mv.visitJumpInsn(Opcodes.GOTO, end);

    mv.visitLabel(old);
    mv.visitInsn(Opcodes.POP);

    mv.visitLabel(end);
}

From source file:com.alibaba.hotswap.processor.jdk.classloader.modifier.DefineClassMethodModifier.java

License:Open Source License

@Override
public void visitInsn(int opcode) {
    if (opcode == Opcodes.ARETURN) {
        mv.visitVarInsn(Opcodes.ALOAD, 1);
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapRuntime.class), "hasClassMeta",
                "(Ljava/lang/String;)Z");
        Label end = new Label();
        mv.visitJumpInsn(Opcodes.IFEQ, end);

        mv.visitInsn(Opcodes.DUP);//from   w w w .  ja v a2  s .  c o  m
        mv.visitVarInsn(Opcodes.ALOAD, 1);
        mv.visitInsn(Opcodes.SWAP);
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapRuntime.class),
                "updateClassMetaClass", "(Ljava/lang/String;Ljava/lang/Class;)V");

        mv.visitLabel(end);
    }

    super.visitInsn(opcode);
}

From source file:com.alibaba.hotswap.processor.jdk.classloader.modifier.FindClassMethodModifier.java

License:Open Source License

@Override
public void visitCode() {
    super.visitCode();

    Label normal = new Label();

    mv.visitVarInsn(Opcodes.ALOAD, 0);/*from   w w  w  . j  a  v a2 s.  c  o  m*/
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(ClassLoaderHelper.class), "tryLoadVClass",
            "(Ljava/lang/ClassLoader;Ljava/lang/String;)Ljava/lang/Class;");
    mv.visitInsn(Opcodes.DUP);
    mv.visitJumpInsn(Opcodes.IFNULL, normal);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitLabel(normal);
    mv.visitInsn(Opcodes.POP);
}

From source file:com.alibaba.hotswap.processor.jdk.lang.modifier.ClassNewInstanceModifier.java

License:Open Source License

@Override
public void visitCode() {
    super.visitCode();

    mv.visitVarInsn(Opcodes.ALOAD, 0);/*from  w w w . ja va 2 s  .c  o m*/
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Class", "getName", "()Ljava/lang/String;");
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapRuntime.class), "hasClassMeta",
            "(Ljava/lang/String;)Z");
    Label old = new Label();
    mv.visitJumpInsn(Opcodes.IFEQ, old);

    // check it as a primary constructor
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Class", "getName", "()Ljava/lang/String;");
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapRuntime.class), "getClassMeta",
            "(Ljava/lang/String;)Lcom/alibaba/hotswap/meta/ClassMeta;");
    mv.visitLdcInsn(HotswapConstants.INIT);
    mv.visitLdcInsn("()V");
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(ClassMeta.class), "isPrimaryInitMethod",
            "(Ljava/lang/String;Ljava/lang/String;)Z");
    mv.visitJumpInsn(Opcodes.IFNE, old);

    // get uniform constructor
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapMethodUtil.class),
            "getConstructorParamTypes", "()[Ljava/lang/Class;");
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Class", "getConstructor",
            "([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;");

    // index and objs
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Class", "getName", "()Ljava/lang/String;");
    mv.visitLdcInsn(HotswapConstants.INIT);
    mv.visitLdcInsn("()V");
    loadArgs();
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapMethodUtil.class), "getMethodParams",
            "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;[Ljava/lang/Object;)[Ljava/lang/Object;");

    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/reflect/Constructor", "newInstance",
            "([Ljava/lang/Object;)Ljava/lang/Object;");
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitLabel(old);
}

From source file:com.alibaba.hotswap.processor.jdk.lang.modifier.PrivateGetDeclaredConstructors.java

License:Open Source License

@Override
public void visitMethodInsn(int opcode, String owner, String name, String desc) {

    if (opcode == Opcodes.INVOKESPECIAL && owner.equals("java/lang/Class")
            && name.equals("getDeclaredConstructors0") && desc.equals("(Z)[Ljava/lang/reflect/Constructor;")) {
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Class", "getName", "()Ljava/lang/String;");
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapRuntime.class), "hasClassMeta",
                "(Ljava/lang/String;)Z");
        Label old = new Label();
        mv.visitJumpInsn(Opcodes.IFEQ, old);

        mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(MethodReflectHelper.class),
                "getDeclaredConstructors0", "(Ljava/lang/Class;Z)[Ljava/lang/reflect/Constructor;");
        Label end = new Label();
        mv.visitJumpInsn(Opcodes.GOTO, end);
        mv.visitLabel(old);//w ww.  java2 s  .co  m
        super.visitMethodInsn(opcode, owner, name, desc);
        mv.visitLabel(end);
    } else {
        super.visitMethodInsn(opcode, owner, name, desc);
    }
}

From source file:com.alibaba.hotswap.processor.jdk.lang.modifier.PrivateGetDeclaredFieldsModifier.java

License:Open Source License

@Override
public void visitMethodInsn(int opcode, String owner, String name, String desc) {

    if (opcode == Opcodes.INVOKESPECIAL && owner.equals("java/lang/Class") && name.equals("getDeclaredFields0")
            && desc.equals("(Z)[Ljava/lang/reflect/Field;")) {
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Class", "getName", "()Ljava/lang/String;");
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapRuntime.class), "hasClassMeta",
                "(Ljava/lang/String;)Z");
        Label old = new Label();
        mv.visitJumpInsn(Opcodes.IFEQ, old);

        // mv.visitInsn(Opcodes.POP2);
        // mv.visitVarInsn(Opcodes.ALOAD, 0);
        // mv.visitVarInsn(Opcodes.ILOAD, 1);
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(FieldReflectHelper.class),
                "privateGetDeclaredFields0", "(Ljava/lang/Class;Z)[Ljava/lang/reflect/Field;");
        Label end = new Label();
        mv.visitJumpInsn(Opcodes.GOTO, end);
        mv.visitLabel(old);//from   w  w  w  .j  a  v  a 2 s.  c  om
        super.visitMethodInsn(opcode, owner, name, desc);
        mv.visitLabel(end);
    } else {
        super.visitMethodInsn(opcode, owner, name, desc);
    }
}

From source file:com.alibaba.hotswap.processor.jdk.reflect.modifier.ConstructorNewInstanceModifier.java

License:Open Source License

@Override
public void visitCode() {
    super.visitCode();
    Label old = new Label();

    mv.visitVarInsn(Opcodes.ALOAD, 0);/*w  w  w. jav  a 2  s . c  om*/
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/lang/reflect/Constructor", "parameterTypes",
            "[Ljava/lang/Class;");
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(MethodReflectHelper.class),
            "isUniformConstructorArgsType", "([Ljava/lang/Class;)Z");
    ifZCmp(NE, old);

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/lang/reflect/Constructor", "clazz", "Ljava/lang/Class;");
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Class", "getName", "()Ljava/lang/String;");
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapRuntime.class), "hasClassMeta",
            "(Ljava/lang/String;)Z");
    mv.visitJumpInsn(Opcodes.IFEQ, old);

    // check it as a primary constructor
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/lang/reflect/Constructor", "clazz", "Ljava/lang/Class;");
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Class", "getName", "()Ljava/lang/String;");
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapRuntime.class), "getClassMeta",
            "(Ljava/lang/String;)Lcom/alibaba/hotswap/meta/ClassMeta;");
    mv.visitLdcInsn(HotswapConstants.INIT);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(Type.class), "getConstructorDescriptor",
            "(Ljava/lang/reflect/Constructor;)Ljava/lang/String;");
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(ClassMeta.class), "isPrimaryInitMethod",
            "(Ljava/lang/String;Ljava/lang/String;)Z");
    mv.visitJumpInsn(Opcodes.IFNE, old);

    // get uniform constructor
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/lang/reflect/Constructor", "clazz", "Ljava/lang/Class;");
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapMethodUtil.class),
            "getConstructorParamTypes", "()[Ljava/lang/Class;");
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Class", "getConstructor",
            "([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;");

    // index and objs
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/lang/reflect/Constructor", "clazz", "Ljava/lang/Class;");
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Class", "getName", "()Ljava/lang/String;");
    mv.visitLdcInsn(HotswapConstants.INIT);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(Type.class), "getConstructorDescriptor",
            "(Ljava/lang/reflect/Constructor;)Ljava/lang/String;");
    loadArgs();
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(HotswapMethodUtil.class), "getMethodParams",
            "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;[Ljava/lang/Object;)[Ljava/lang/Object;");

    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/reflect/Constructor", "newInstance",
            "([Ljava/lang/Object;)Ljava/lang/Object;");
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitLabel(old);
}