Example usage for org.objectweb.asm MethodVisitor visitJumpInsn

List of usage examples for org.objectweb.asm MethodVisitor visitJumpInsn

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Introduction

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

Prototype

public void visitJumpInsn(final int opcode, final Label label)

Source Link

Document

Visits a jump instruction.

Usage

From source file:org.graalvm.compiler.replacements.test.DeoptimizeOnExceptionTest.java

License:Open Source License

private static byte[] makeClazz() {
    // Code generated the class below using asm.
    String clazzName = DeoptimizeOnExceptionTest.class.getName().replace('.', '/');
    final ClassWriter w = new ClassWriter(0);
    w.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC, "t/TestJSR", null, "java/lang/Object",
            new String[] { "java/lang/Runnable" });
    MethodVisitor mv = w.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, new String[] {});
    mv.visitCode();/* w ww.j av  a  2 s. com*/
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
    mv.visitInsn(Opcodes.RETURN);
    mv.visitMaxs(10, 10);
    mv.visitEnd();

    mv = w.visitMethod(Opcodes.ACC_PUBLIC, "run", "()V", null, null);
    mv.visitCode();
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, clazzName, "getM", "()Ljava/lang/Object;", false);
    Label l1 = new Label();
    mv.visitJumpInsn(Opcodes.JSR, l1);
    mv.visitInsn(Opcodes.RETURN);

    mv.visitLabel(l1);
    mv.visitVarInsn(Opcodes.ASTORE, 1);

    Label lElse = new Label();
    Label lEnd = new Label();
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/System", "currentTimeMillis", "()J", false);
    mv.visitInsn(Opcodes.POP2);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, clazzName, "getM", "()Ljava/lang/Object;", false);
    mv.visitInsn(Opcodes.DUP);
    mv.visitJumpInsn(Opcodes.IFNULL, lElse);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, clazzName, "methodA", "()V", false);
    mv.visitJumpInsn(Opcodes.GOTO, lEnd);
    mv.visitLabel(lElse);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, clazzName, "methodB", "()V", false);
    mv.visitLabel(lEnd);

    mv.visitVarInsn(Opcodes.RET, 1);
    mv.visitMaxs(10, 10);
    mv.visitEnd();
    return w.toByteArray();
}

From source file:org.gradle.model.internal.manage.schema.extract.ManagedProxyClassGenerator.java

License:Apache License

private void writeEqualsMethod(ClassVisitor cw, Type generatedType) {
    MethodVisitor methodVisitor = cw.visitMethod(Opcodes.ACC_PUBLIC, "equals", EQUALS_METHOD_DESCRIPTOR, null,
            null);/*  ww  w  .ja  v a 2 s  .  c  om*/
    methodVisitor.visitCode();

    // if (arg == this) { return true; }
    methodVisitor.visitVarInsn(ALOAD, 0);
    methodVisitor.visitVarInsn(ALOAD, 1);
    Label notSameLabel = new Label();
    methodVisitor.visitJumpInsn(IF_ACMPNE, notSameLabel);
    methodVisitor.visitInsn(ICONST_1);
    methodVisitor.visitInsn(IRETURN);

    // if (!(age instanceof GeneratedView)) { return false; }
    methodVisitor.visitLabel(notSameLabel);
    methodVisitor.visitVarInsn(ALOAD, 1);
    methodVisitor.visitTypeInsn(INSTANCEOF, GENERATED_VIEW_TYPE.getInternalName());
    Label generatedViewLabel = new Label();
    methodVisitor.visitJumpInsn(IFNE, generatedViewLabel);
    methodVisitor.visitInsn(ICONST_0);
    methodVisitor.visitInsn(IRETURN);

    // return state.equals(((GeneratedView)arg).__view_state());
    methodVisitor.visitLabel(generatedViewLabel);
    putStateFieldValueOnStack(methodVisitor, generatedType);
    methodVisitor.visitVarInsn(ALOAD, 1);
    methodVisitor.visitTypeInsn(CHECKCAST, GENERATED_VIEW_TYPE.getInternalName());
    methodVisitor.visitMethodInsn(INVOKEINTERFACE, GENERATED_VIEW_TYPE.getInternalName(), "__view_state__",
            GET_VIEW_STATE_METHOD_DESCRIPTOR, true);
    methodVisitor.visitMethodInsn(INVOKEINTERFACE, GENERATED_VIEW_STATE_TYPE_NAME, "equals",
            EQUALS_METHOD_DESCRIPTOR, true);
    finishVisitingMethod(methodVisitor, Opcodes.IRETURN);
}

From source file:org.gradle.model.internal.manage.schema.extract.ManagedProxyClassGenerator.java

License:Apache License

private void jumpToLabelIfStackEvaluatesToTrue(MethodVisitor methodVisitor, Label label) {
    methodVisitor.visitJumpInsn(IFNE, label);
}

From source file:org.gradle.model.internal.manage.schema.extract.ManagedProxyClassGenerator.java

License:Apache License

private void unboxType(MethodVisitor methodVisitor, Class<?> primitiveClass) {
    // Float f = (Float) tmp
    // f==null?0:f.floatValue()
    Class<?> boxedType = BOXED_TYPES.get(primitiveClass);
    Type primitiveType = Type.getType(primitiveClass);
    methodVisitor.visitTypeInsn(CHECKCAST, Type.getInternalName(boxedType));
    methodVisitor.visitInsn(DUP);/*  ww w  .  j a v  a  2s  .  c om*/
    Label exit = new Label();
    Label elseValue = new Label();
    methodVisitor.visitJumpInsn(IFNONNULL, elseValue);
    methodVisitor.visitInsn(POP);
    pushDefaultValue(methodVisitor, primitiveClass);
    methodVisitor.visitJumpInsn(GOTO, exit);
    methodVisitor.visitLabel(elseValue);
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, Type.getInternalName(boxedType),
            primitiveClass.getSimpleName() + "Value", Type.getMethodDescriptor(primitiveType), false);
    methodVisitor.visitLabel(exit);
}

From source file:org.jacoco.core.instr.ClassFileVersionsTest.java

License:Open Source License

/**
 * Creates a class that requires a frame before the return statement. Also
 * for this class instrumentation should insert another frame.
 *
 * <code><pre>//from www . j av a2s. c  o  m
 * public class Sample {
 *   public Sample(boolean b){
 *     if(b){
 *       toString();
 *     }
 *     return;
 *   }
 * }
 * </pre></code>
 */
private byte[] createClass(int version, boolean frames) {

    ClassWriter cw = new ClassWriter(0);
    MethodVisitor mv;

    cw.visit(version, ACC_PUBLIC + ACC_SUPER, "org/jacoco/test/Sample", null, "java/lang/Object", null);

    mv = cw.visitMethod(ACC_PUBLIC, "<init>", "(Z)V", null, null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
    mv.visitVarInsn(ILOAD, 1);
    Label l1 = new Label();
    mv.visitJumpInsn(IFEQ, l1);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "toString", "()Ljava/lang/String;", false);
    mv.visitInsn(POP);
    mv.visitLabel(l1);
    if (frames) {
        mv.visitFrame(F_NEW, 2, new Object[] { "org/jacoco/test/Sample", Opcodes.INTEGER }, 0, new Object[] {});
    }
    mv.visitInsn(RETURN);
    mv.visitMaxs(1, 2);
    mv.visitEnd();

    cw.visitEnd();

    return cw.toByteArray();
}

From source file:org.jacoco.core.instr.ResizeInstructionsTest.java

License:Open Source License

/**
 * Adds code that requires/*from www .jav  a 2 s . co m*/
 * {@link ClassWriter#getCommonSuperClass(String, String)}.
 *
 * <pre>
 * Object o = this;
 * while (true) {
 *    o = (Integer) null;
 * }
 * </pre>
 */
private static void addCauseOfGetCommonSuperClass(final MethodVisitor mv) {
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ASTORE, 1);
    Label label = new Label();
    mv.visitLabel(label);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Integer");
    mv.visitVarInsn(Opcodes.ASTORE, 1);
    mv.visitJumpInsn(Opcodes.GOTO, label);
}

From source file:org.jacoco.core.instr.ResizeInstructionsTest.java

License:Open Source License

/**
 * Adds code that triggers usage of// w w  w  . j a  va2s .c  o  m
 * {@link org.objectweb.asm.MethodWriter#COMPUTE_INSERTED_FRAMES} during
 * instrumentation.
 */
private static void addCauseOfResizeInstructions(final MethodVisitor mv) {
    mv.visitInsn(Opcodes.ICONST_0);
    mv.visitInsn(Opcodes.ICONST_1);
    final Label target = new Label();
    mv.visitJumpInsn(Opcodes.IFLE, target);
    for (int i = 0; i < Short.MAX_VALUE; i++) {
        mv.visitInsn(Opcodes.NOP);
    }
    mv.visitLabel(target);
}

From source file:org.jacoco.core.internal.instr.ClassFieldProbeArrayStrategy.java

License:Open Source License

private void createInitMethod(final ClassVisitor cv, final int probeCount) {
    final MethodVisitor mv = cv.visitMethod(InstrSupport.INITMETHOD_ACC, InstrSupport.INITMETHOD_NAME,
            InstrSupport.INITMETHOD_DESC, null, null);
    mv.visitCode();//  w w  w.  j  a  va2 s.  c om

    // Load the value of the static data field:
    mv.visitFieldInsn(Opcodes.GETSTATIC, className, InstrSupport.DATAFIELD_NAME, InstrSupport.DATAFIELD_DESC);
    mv.visitInsn(Opcodes.DUP);

    // Stack[1]: [Z
    // Stack[0]: [Z

    // Skip initialization when we already have a data array:
    final Label alreadyInitialized = new Label();
    mv.visitJumpInsn(Opcodes.IFNONNULL, alreadyInitialized);

    // Stack[0]: [Z

    mv.visitInsn(Opcodes.POP);
    final int size = genInitializeDataField(mv, probeCount);

    // Stack[0]: [Z

    // Return the class' probe array:
    if (withFrames) {
        mv.visitFrame(Opcodes.F_NEW, 0, FRAME_LOCALS_EMPTY, 1, FRAME_STACK_ARRZ);
    }
    mv.visitLabel(alreadyInitialized);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitMaxs(Math.max(size, 2), 0); // Maximum local stack size is 2
    mv.visitEnd();
}

From source file:org.jacoco.core.internal.instr.InterfaceFieldProbeArrayStrategy.java

License:Open Source License

private void createInitMethod(final ClassVisitor cv, final int probeCount) {
    final MethodVisitor mv = cv.visitMethod(InstrSupport.INITMETHOD_ACC, InstrSupport.INITMETHOD_NAME,
            InstrSupport.INITMETHOD_DESC, null, null);
    mv.visitCode();//from  ww  w .  ja  va  2 s  . c om

    // Load the value of the static data field:
    mv.visitFieldInsn(Opcodes.GETSTATIC, className, InstrSupport.DATAFIELD_NAME, InstrSupport.DATAFIELD_DESC);
    mv.visitInsn(Opcodes.DUP);

    // Stack[1]: [Z
    // Stack[0]: [Z

    // Skip initialization when we already have a data array:
    final Label alreadyInitialized = new Label();
    mv.visitJumpInsn(Opcodes.IFNONNULL, alreadyInitialized);

    // Stack[0]: [Z

    mv.visitInsn(Opcodes.POP);
    final int size = accessorGenerator.generateDataAccessor(classId, className, probeCount, mv);

    // Stack[0]: [Z

    // Return the class' probe array:
    mv.visitFrame(Opcodes.F_NEW, 0, FRAME_LOCALS_EMPTY, 1, FRAME_STACK_ARRZ);
    mv.visitLabel(alreadyInitialized);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitMaxs(Math.max(size, 2), 0); // Maximum local stack size is 2
    mv.visitEnd();
}

From source file:org.javachannel.examples.brokenverifier.VerifierTest.java

License:Apache License

@Test
public void generateComparator() {
    final String slashName = "test/Verifier";
    final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
    ClassWriter cw = new ClassWriter(0);
    cw.visit(V1_7, ACC_PUBLIC | ACC_SYNTHETIC, slashName, null, "java/util/HashSet", null);

    Label lOtherSuper = new Label();
    Label lDoSomething = new Label();

    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();/*from  ww w  .  j av a  2s . co m*/
    mv.visitFrame(F_NEW, 1, new Object[] { UNINITIALIZED_THIS }, 0, EMPTY_OBJECT_ARRAY);
    mv.visitJumpInsn(GOTO, lOtherSuper);

    mv.visitFrame(F_NEW, 1, new Object[] { UNINITIALIZED_THIS }, 0, EMPTY_OBJECT_ARRAY);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, "java/util/HashSet", "<init>", "()V", false);

    mv.visitFrame(F_NEW, 1, new Object[] { slashName }, 0, EMPTY_OBJECT_ARRAY);
    mv.visitLabel(lDoSomething);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/util/HashSet", "size", "()I", false);
    mv.visitInsn(POP);
    mv.visitInsn(RETURN);

    mv.visitFrame(F_NEW, 1, new Object[] { UNINITIALIZED_THIS }, 0, EMPTY_OBJECT_ARRAY);
    mv.visitLabel(lOtherSuper);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitIntInsn(BIPUSH, 1);
    mv.visitMethodInsn(INVOKESPECIAL, "java/util/HashSet", "<init>", "(I)V", false);
    mv.visitJumpInsn(GOTO, lDoSomething);

    mv.visitMaxs(3, 1);
    mv.visitEnd();
    cw.visitEnd();

    byte[] b = cw.toByteArray();

    MyClassLoader cl = new MyClassLoader();
    Class c = cl.defineClass(slashName.replace('/', '.'), b);
    Method[] m = c.getMethods();

}