Example usage for org.objectweb.asm Opcodes INVOKEVIRTUAL

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

Prototype

int INVOKEVIRTUAL

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

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Usage

From source file:org.jacoco.core.internal.analysis.filter.KotlinCoroutineFilterTest.java

License:Open Source License

/**
 * <pre>/*  w w w . ja  v a  2 s. c o m*/
 *     runBlocking {
 *         val x = 42
 *         nop(x)
 *         suspendingFunction()
 *         nop(x)
 *     }
 * </pre>
 */
@Test
public void should_filter_suspending_lambdas() {
    final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0, "invokeSuspend",
            "(Ljava/lang/Object;)Ljava/lang/Object;", null, null);
    context.classAnnotations.add(KotlinGeneratedFilter.KOTLIN_METADATA_DESC);

    m.visitLabel(new Label());
    final Range range1 = new Range();
    range1.fromInclusive = m.instructions.getLast();
    m.visitMethodInsn(Opcodes.INVOKESTATIC, "kotlin/coroutines/intrinsics/IntrinsicsKt",
            "getCOROUTINE_SUSPENDED", "()Ljava/lang/Object;", false);
    m.visitVarInsn(Opcodes.ASTORE, 4);

    m.visitVarInsn(Opcodes.ALOAD, 0);
    // line of "runBlocking"
    m.visitFieldInsn(Opcodes.GETFIELD, "Target", "label", "I");
    final Label dflt = new Label();
    final Label state0 = new Label();
    final Label state1 = new Label();
    m.visitTableSwitchInsn(0, 1, dflt, state0, state1);

    m.visitLabel(state0);

    {
        m.visitVarInsn(Opcodes.ALOAD, 1);
        m.visitInsn(Opcodes.DUP);
        m.visitTypeInsn(Opcodes.INSTANCEOF, "kotlin/Result$Failure");
        Label label = new Label();
        m.visitJumpInsn(Opcodes.IFEQ, label);
        m.visitTypeInsn(Opcodes.CHECKCAST, "kotlin/Result$Failure");
        m.visitFieldInsn(Opcodes.GETFIELD, "kotlin/Result$Failure", "exception", "Ljava/lang/Throwable");
        m.visitInsn(Opcodes.ATHROW);
        m.visitInsn(Opcodes.POP);
        range1.toInclusive = m.instructions.getLast();
        m.visitLabel(label);
    }

    // line before "suspendingFunction"
    m.visitInsn(Opcodes.NOP);

    // line of "suspendingFunction"
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "", "suspendingFunction",
            "(Lkotlin/coroutines/Continuation;)Ljava/lang/Object;", false);

    m.visitInsn(Opcodes.DUP);
    final Range range2 = new Range();
    range2.fromInclusive = m.instructions.getLast();
    m.visitVarInsn(Opcodes.ALOAD, 4);
    final Label continuationLabelAfterLoadedResult = new Label();
    m.visitJumpInsn(Opcodes.IF_ACMPNE, continuationLabelAfterLoadedResult);
    // line of "runBlocking"
    m.visitVarInsn(Opcodes.ALOAD, 4);
    m.visitInsn(Opcodes.ARETURN);

    m.visitLabel(state1);

    m.visitVarInsn(Opcodes.ALOAD, 0);
    m.visitFieldInsn(Opcodes.GETFIELD, "Target", "I$0", "I");
    m.visitVarInsn(Opcodes.ISTORE, 3);

    {
        m.visitVarInsn(Opcodes.ALOAD, 1);
        m.visitInsn(Opcodes.DUP);
        m.visitTypeInsn(Opcodes.INSTANCEOF, "kotlin/Result$Failure");
        final Label label = new Label();
        m.visitJumpInsn(Opcodes.IFEQ, label);
        m.visitTypeInsn(Opcodes.CHECKCAST, "kotlin/Result$Failure");
        m.visitFieldInsn(Opcodes.GETFIELD, "kotlin/Result$Failure", "exception", "Ljava/lang/Throwable");
        m.visitInsn(Opcodes.ATHROW);
        m.visitInsn(Opcodes.POP);
        m.visitLabel(label);
    }
    m.visitVarInsn(Opcodes.ALOAD, 1);
    range2.toInclusive = m.instructions.getLast();
    m.visitLabel(continuationLabelAfterLoadedResult);

    // line after "suspendingFunction"
    m.visitInsn(Opcodes.NOP);
    m.visitInsn(Opcodes.ARETURN);

    m.visitLabel(dflt);
    final Range range0 = new Range();
    range0.fromInclusive = m.instructions.getLast();
    m.visitTypeInsn(Opcodes.NEW, "java/lang/IllegalStateException");
    m.visitInsn(Opcodes.DUP);
    m.visitLdcInsn("call to 'resume' before 'invoke' with coroutine");
    m.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/IllegalStateException", "<init>",
            "(Ljava/lang/String;)V", false);
    m.visitInsn(Opcodes.ATHROW);
    range0.toInclusive = m.instructions.getLast();

    filter.filter(m, context, output);

    assertIgnored(range0, range1, range2);
}

---

From source file:org.jacoco.core.internal.analysis.filter.KotlinCoroutineFilterTest.java

License:Open Source License

/**
 * <pre>/*w  w  w.  j  a  va2 s  .  co m*/
 *     suspend fun example() {
 *         suspendingFunction()
 *         nop()
 *     }
 * </pre>
 */
@Test
public void should_filter_suspending_functions() {
    final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, Opcodes.ACC_STATIC, "example",
            "(Lkotlin/coroutines/Continuation;)Ljava/lang/Object;", null, null);
    context.classAnnotations.add(KotlinGeneratedFilter.KOTLIN_METADATA_DESC);

    final int continuationArgumentIndex = 0;
    final int continuationIndex = 2;

    m.visitVarInsn(Opcodes.ALOAD, continuationArgumentIndex);
    final Range range1 = new Range();
    range1.fromInclusive = m.instructions.getLast();
    m.visitTypeInsn(Opcodes.INSTANCEOF, "ExampleKt$example$1");
    final Label createStateInstance = new Label();
    m.visitJumpInsn(Opcodes.IFEQ, createStateInstance);

    m.visitVarInsn(Opcodes.ALOAD, continuationArgumentIndex);
    m.visitTypeInsn(Opcodes.CHECKCAST, "ExampleKt$example$1");
    m.visitVarInsn(Opcodes.ASTORE, continuationIndex);

    m.visitVarInsn(Opcodes.ALOAD, continuationIndex);
    m.visitFieldInsn(Opcodes.GETFIELD, "ExampleKt$example$1", "label", "I");

    m.visitLdcInsn(Integer.valueOf(Integer.MIN_VALUE));
    m.visitInsn(Opcodes.IAND);
    m.visitJumpInsn(Opcodes.IFEQ, createStateInstance);

    m.visitVarInsn(Opcodes.ALOAD, continuationIndex);
    m.visitInsn(Opcodes.DUP);
    m.visitFieldInsn(Opcodes.GETFIELD, "ExampleKt$example$1", "label", "I");

    m.visitLdcInsn(Integer.valueOf(Integer.MIN_VALUE));
    m.visitInsn(Opcodes.ISUB);
    m.visitFieldInsn(Opcodes.PUTFIELD, "ExampleKt$example$1", "label", "I");

    final Label afterCoroutineStateCreated = new Label();
    m.visitJumpInsn(Opcodes.GOTO, afterCoroutineStateCreated);

    m.visitLabel(createStateInstance);

    m.visitTypeInsn(Opcodes.NEW, "ExampleKt$example$1");
    m.visitInsn(Opcodes.DUP);
    m.visitVarInsn(Opcodes.ALOAD, continuationArgumentIndex);
    m.visitMethodInsn(Opcodes.INVOKESPECIAL, "ExampleKt$example$1", "<init>",
            "(Lkotlin/coroutines/Continuation;)V", false);

    m.visitVarInsn(Opcodes.ASTORE, continuationIndex);

    m.visitLabel(afterCoroutineStateCreated);

    m.visitVarInsn(Opcodes.ALOAD, continuationIndex);
    m.visitFieldInsn(Opcodes.GETFIELD, "ExampleKt$example$1", "result", "Ljava/lang/Object;");
    m.visitVarInsn(Opcodes.ASTORE, 1);

    m.visitMethodInsn(Opcodes.INVOKESTATIC, "kotlin/coroutines/intrinsics/IntrinsicsKt",
            "getCOROUTINE_SUSPENDED", "()Ljava/lang/Object;", false);

    // line of "fun"
    m.visitVarInsn(Opcodes.ASTORE, 3);

    m.visitVarInsn(Opcodes.ALOAD, continuationIndex);
    m.visitFieldInsn(Opcodes.GETFIELD, "ExampleKt$example$1", "label", "I");
    final Label dflt = new Label();
    final Label state0 = new Label();
    final Label state1 = new Label();
    m.visitTableSwitchInsn(0, 1, dflt, state0, state1);

    m.visitLabel(state0);

    {
        m.visitVarInsn(Opcodes.ALOAD, 1);
        m.visitInsn(Opcodes.DUP);
        m.visitTypeInsn(Opcodes.INSTANCEOF, "kotlin/Result$Failure");
        Label label = new Label();
        m.visitJumpInsn(Opcodes.IFEQ, label);
        m.visitTypeInsn(Opcodes.CHECKCAST, "kotlin/Result$Failure");
        m.visitFieldInsn(Opcodes.GETFIELD, "kotlin/Result$Failure", "exception", "Ljava/lang/Throwable");
        m.visitInsn(Opcodes.ATHROW);
        m.visitInsn(Opcodes.POP);
        range1.toInclusive = m.instructions.getLast();
        m.visitLabel(label);
    }

    // line of "suspendingFunction"
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "", "suspendingFunction",
            "(Lkotlin/coroutines/Continuation;)Ljava/lang/Object;", false);

    m.visitInsn(Opcodes.DUP);
    final Range range2 = new Range();
    range2.fromInclusive = m.instructions.getLast();
    m.visitVarInsn(Opcodes.ALOAD, 3);
    final Label continuationLabelAfterLoadedResult = new Label();
    m.visitJumpInsn(Opcodes.IF_ACMPNE, continuationLabelAfterLoadedResult);
    // line of "fun"
    m.visitVarInsn(Opcodes.ALOAD, 3);
    m.visitInsn(Opcodes.ARETURN);

    m.visitLabel(state1);

    {
        m.visitVarInsn(Opcodes.ALOAD, 1);
        m.visitInsn(Opcodes.DUP);
        m.visitTypeInsn(Opcodes.INSTANCEOF, "kotlin/Result$Failure");
        final Label label = new Label();
        m.visitJumpInsn(Opcodes.IFEQ, label);
        m.visitTypeInsn(Opcodes.CHECKCAST, "kotlin/Result$Failure");
        m.visitFieldInsn(Opcodes.GETFIELD, "kotlin/Result$Failure", "exception", "Ljava/lang/Throwable");
        m.visitInsn(Opcodes.ATHROW);
        m.visitInsn(Opcodes.POP);
        m.visitLabel(label);
    }
    m.visitVarInsn(Opcodes.ALOAD, 1);
    range2.toInclusive = m.instructions.getLast();
    m.visitLabel(continuationLabelAfterLoadedResult);

    // line after "suspendingFunction"
    m.visitInsn(Opcodes.NOP);
    m.visitInsn(Opcodes.ARETURN);

    m.visitLabel(dflt);
    final Range range0 = new Range();
    range0.fromInclusive = m.instructions.getLast();
    m.visitTypeInsn(Opcodes.NEW, "java/lang/IllegalStateException");
    m.visitInsn(Opcodes.DUP);
    m.visitLdcInsn("call to 'resume' before 'invoke' with coroutine");
    m.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/IllegalStateException", "<init>",
            "(Ljava/lang/String;)V", false);
    m.visitInsn(Opcodes.ATHROW);
    range0.toInclusive = m.instructions.getLast();

    filter.filter(m, context, output);

    assertIgnored(range0, range1, range2);
}

---

From source file:org.jacoco.core.internal.analysis.filter.KotlinLateinitFilterTest.java

License:Open Source License

@Test
public void testLateinitBranchIsFiltered() {
    final Label l1 = new Label();
    final Label l2 = new Label();

    m.visitLabel(l1);//from  w  w  w  . j  a va 2 s  .co  m
    m.visitVarInsn(Opcodes.ALOAD, 0);
    m.visitFieldInsn(Opcodes.GETFIELD, "com/better/alarm/background/VibrationService", "wakeLock",
            "Landroid/os/PowerManager$WakeLock;");
    m.visitInsn(Opcodes.DUP);
    m.visitJumpInsn(Opcodes.IFNONNULL, l2);

    final AbstractInsnNode expectedFrom = m.instructions.getLast();

    m.visitLdcInsn("wakelock");
    m.visitMethodInsn(Opcodes.INVOKESTATIC, "kotlin/jvm/internal/Intrinsics",
            "throwUninitializedPropertyAccessException", "(Ljava/lang/String;)V", false);
    final AbstractInsnNode expectedTo = m.instructions.getLast();
    m.visitLabel(l2);
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "android/os/PowerManager$WakeLock", "acquire", "", false);

    filter.filter(m, context, output);

    assertIgnored(new Range(expectedFrom, expectedTo));
}

---

From source file:org.jacoco.core.internal.analysis.filter.KotlinNotNullOperatorFilterTest.java

License:Open Source License

/**
 * <pre>//from w ww.  j ava  2 s  .co  m
 *     return x!!.length
 * </pre>
 */
@Test
public void should_filter() {
    m.visitVarInsn(Opcodes.ALOAD, 1);
    m.visitInsn(Opcodes.DUP);

    final Range range = new Range();
    final Label label = new Label();
    m.visitJumpInsn(Opcodes.IFNONNULL, label);
    range.fromInclusive = m.instructions.getLast();
    // no line number here and hence no probe
    m.visitMethodInsn(Opcodes.INVOKESTATIC, "kotlin/jvm/internal/Intrinsics", "throwNpe", "()V", false);
    range.toInclusive = m.instructions.getLast();

    m.visitLabel(label);
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "length", "()I", false);
    m.visitInsn(Opcodes.IRETURN);

    filter.filter(m, context, output);

    assertIgnored(range);
}

---

From source file:org.jacoco.core.internal.analysis.filter.KotlinWhenStringFilterTest.java

License:Open Source License

@Test
public void should_filter() {
    final Set<AbstractInsnNode> expectedNewTargets = new HashSet<AbstractInsnNode>();

    final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0, "name", "()V", null, null);

    final Label h1 = new Label();
    final Label sameHash = new Label();
    final Label h2 = new Label();
    final Label case1 = new Label();
    final Label case2 = new Label();
    final Label case3 = new Label();
    final Label defaultCase = new Label();

    // filter should not remember this unrelated slot
    m.visitLdcInsn("");
    m.visitVarInsn(Opcodes.ASTORE, 1);//from w w  w .j  a v  a  2 s .c o m
    m.visitVarInsn(Opcodes.ALOAD, 1);

    // switch (...)
    m.visitVarInsn(Opcodes.ASTORE, 2);
    m.visitVarInsn(Opcodes.ALOAD, 2);
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode", "()I", false);
    m.visitTableSwitchInsn(97, 98, defaultCase, h1, h2);

    // case "a"
    m.visitLabel(h1);
    final AbstractInsnNode expectedFromInclusive = m.instructions.getLast();

    m.visitVarInsn(Opcodes.ALOAD, 2);
    m.visitLdcInsn("a");
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
    m.visitJumpInsn(Opcodes.IFEQ, sameHash);
    m.visitJumpInsn(Opcodes.GOTO, case1);

    // case "\u0000a"
    m.visitLabel(sameHash);
    m.visitVarInsn(Opcodes.ALOAD, 2);
    m.visitLdcInsn("\u0000a");
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
    m.visitJumpInsn(Opcodes.IFEQ, defaultCase);
    m.visitJumpInsn(Opcodes.GOTO, case2);

    // case "b"
    m.visitLabel(h2);
    m.visitVarInsn(Opcodes.ALOAD, 2);
    m.visitLdcInsn("\u0000a");
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
    m.visitJumpInsn(Opcodes.IFEQ, defaultCase);
    m.visitJumpInsn(Opcodes.GOTO, case3);
    final AbstractInsnNode expectedToInclusive = m.instructions.getLast();

    m.visitLabel(case1);
    m.visitInsn(Opcodes.RETURN);
    expectedNewTargets.add(m.instructions.getLast());
    m.visitLabel(case2);
    m.visitInsn(Opcodes.RETURN);
    expectedNewTargets.add(m.instructions.getLast());
    m.visitLabel(case3);
    m.visitInsn(Opcodes.RETURN);
    expectedNewTargets.add(m.instructions.getLast());
    m.visitLabel(defaultCase);
    m.visitInsn(Opcodes.RETURN);
    expectedNewTargets.add(m.instructions.getLast());

    filter.filter(m, context, output);

    assertReplacedBranches(expectedFromInclusive.getPrevious(), expectedNewTargets);
    assertIgnored(new Range(expectedFromInclusive, expectedToInclusive));
}

---

From source file:org.jacoco.core.internal.analysis.filter.KotlinWhenStringFilterTest.java

License:Open Source License

@Test
public void should_not_filter_empty_lookup_switch() {
    final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0, "name", "(Ljava/lang/String;)V", null,
            null);// w w  w  .  j a  v  a2 s . c  o  m
    m.visitVarInsn(Opcodes.ALOAD, 1);
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode", "()I", false);
    final Label defaultCase = new Label();
    m.visitLookupSwitchInsn(defaultCase, null, new Label[] {});
    m.visitLabel(defaultCase);
    m.visitInsn(Opcodes.RETURN);

    filter.filter(m, context, output);

    assertIgnored();
}

---

From source file:org.jacoco.core.internal.analysis.filter.StringSwitchEcjFilterTest.java

License:Open Source License

@Test
public void should_filter() {
    final Set<AbstractInsnNode> expectedNewTargets = new HashSet<AbstractInsnNode>();

    final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0, "name", "()V", null, null);

    final Label case1 = new Label();
    final Label case2 = new Label();
    final Label case3 = new Label();
    final Label caseDefault = new Label();
    final Label h1 = new Label();
    final Label h2 = new Label();

    // filter should not remember this unrelated slot
    m.visitLdcInsn("");
    m.visitVarInsn(Opcodes.ASTORE, 1);/*from   w  ww  .  j av a2s.  c  o  m*/
    m.visitVarInsn(Opcodes.ALOAD, 1);

    // switch (...)
    m.visitInsn(Opcodes.DUP);
    m.visitVarInsn(Opcodes.ASTORE, 2);
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode", "()I", false);
    m.visitTableSwitchInsn(97, 98, caseDefault, h1, h2);
    final AbstractInsnNode switchNode = m.instructions.getLast();

    m.visitLabel(h1);

    m.visitVarInsn(Opcodes.ALOAD, 2);
    m.visitLdcInsn("a");
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
    // if equal "a", then goto its case
    m.visitJumpInsn(Opcodes.IFNE, case1);

    m.visitVarInsn(Opcodes.ALOAD, 2);
    m.visitLdcInsn("\0a");
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
    // if equal "\0a", then goto its case
    m.visitJumpInsn(Opcodes.IFNE, case2);

    // goto default case
    m.visitJumpInsn(Opcodes.GOTO, caseDefault);

    m.visitLabel(h2);

    m.visitVarInsn(Opcodes.ALOAD, 2);
    m.visitLdcInsn("b");
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
    // if equal "b", then goto its case
    m.visitJumpInsn(Opcodes.IFNE, case3);

    // goto default case
    m.visitJumpInsn(Opcodes.GOTO, caseDefault);
    final AbstractInsnNode expectedToInclusive = m.instructions.getLast();

    m.visitLabel(case1);
    m.visitInsn(Opcodes.RETURN);
    expectedNewTargets.add(m.instructions.getLast());
    m.visitLabel(case2);
    m.visitInsn(Opcodes.RETURN);
    expectedNewTargets.add(m.instructions.getLast());
    m.visitLabel(case3);
    m.visitInsn(Opcodes.RETURN);
    expectedNewTargets.add(m.instructions.getLast());
    m.visitLabel(caseDefault);
    m.visitInsn(Opcodes.RETURN);
    expectedNewTargets.add(m.instructions.getLast());

    filter.filter(m, context, output);

    assertReplacedBranches(switchNode, expectedNewTargets);
    assertIgnored(new Range(switchNode.getNext(), expectedToInclusive));
}

---

From source file:org.jacoco.core.internal.analysis.filter.StringSwitchEcjFilterTest.java

License:Open Source License

@Test
public void should_filter_when_default_is_first() {
    final Set<AbstractInsnNode> expectedNewTargets = new HashSet<AbstractInsnNode>();

    final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0, "name", "()V", null, null);

    final Label case1 = new Label();
    final Label caseDefault = new Label();
    final Label h1 = new Label();

    // filter should not remember this unrelated slot
    m.visitLdcInsn("");
    m.visitVarInsn(Opcodes.ASTORE, 1);//from  w w  w .j av a2s  .c  om
    m.visitVarInsn(Opcodes.ALOAD, 1);

    // switch (...)
    m.visitInsn(Opcodes.DUP);
    m.visitVarInsn(Opcodes.ASTORE, 2);
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode", "()I", false);
    m.visitLookupSwitchInsn(caseDefault, new int[] { 97 }, new Label[] { h1 });
    final AbstractInsnNode switchNode = m.instructions.getLast();

    m.visitLabel(h1);

    m.visitVarInsn(Opcodes.ALOAD, 2);
    m.visitLdcInsn("a");
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
    // if equal "a", then goto its case
    m.visitJumpInsn(Opcodes.IFNE, case1);

    final AbstractInsnNode expectedToInclusive = m.instructions.getLast();

    m.visitLabel(caseDefault);
    m.visitInsn(Opcodes.RETURN);
    expectedNewTargets.add(m.instructions.getLast());
    m.visitLabel(case1);
    m.visitInsn(Opcodes.RETURN);
    expectedNewTargets.add(m.instructions.getLast());

    filter.filter(m, context, output);

    assertReplacedBranches(switchNode, expectedNewTargets);
    assertIgnored(new Range(switchNode.getNext(), expectedToInclusive));
}

---

From source file:org.jacoco.core.internal.analysis.filter.StringSwitchEcjFilterTest.java

License:Open Source License

@Test
public void should_not_filter_empty_lookup_switch() {
    final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0, "name", "(Ljava/lang/String;)V", null,
            null);//w w w.  j  a v a 2s .  c o m
    m.visitVarInsn(Opcodes.ALOAD, 1);
    m.visitVarInsn(Opcodes.ASTORE, 2);
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode", "()I", false);
    final Label defaultCase = new Label();
    m.visitLookupSwitchInsn(defaultCase, null, new Label[] {});
    m.visitLabel(defaultCase);
    m.visitInsn(Opcodes.RETURN);

    filter.filter(m, context, output);

    assertIgnored();
}

---

From source file:org.jacoco.core.internal.analysis.filter.StringSwitchJavacFilterTest.java

License:Open Source License

private void createFirstSwitch() {
    final Label h1 = new Label();
    final Label h1_2 = new Label();
    final Label h2 = new Label();
    final Label secondSwitch = new Label();

    m.visitInsn(Opcodes.ICONST_M1);/* w w  w.j  a  va2s . c o  m*/
    m.visitVarInsn(Opcodes.ISTORE, 2);

    m.visitVarInsn(Opcodes.ALOAD, 1);
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode", "()I", false);
    m.visitLookupSwitchInsn(secondSwitch, new int[] { 97, 98 }, new Label[] { h1, h2 });
    expectedFromInclusive = m.instructions.getLast();

    m.visitLabel(h1);
    m.visitVarInsn(Opcodes.ALOAD, 1);
    m.visitLdcInsn("a");
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
    // if not equal "a", then goto next comparison
    m.visitJumpInsn(Opcodes.IFEQ, h1_2);
    m.visitInsn(Opcodes.ICONST_0);
    m.visitVarInsn(Opcodes.ISTORE, 2);

    // goto secondSwitch
    m.visitJumpInsn(Opcodes.GOTO, secondSwitch);

    m.visitLabel(h1_2);
    m.visitVarInsn(Opcodes.ALOAD, 1);
    m.visitLdcInsn("\0a");
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
    // if not equal "\0a", then goto second switch
    m.visitJumpInsn(Opcodes.IFEQ, secondSwitch);
    m.visitInsn(Opcodes.ICONST_1);
    m.visitVarInsn(Opcodes.ISTORE, 2);

    // goto secondSwitch
    m.visitJumpInsn(Opcodes.GOTO, secondSwitch);

    m.visitLabel(h2);
    m.visitVarInsn(Opcodes.ALOAD, 1);
    m.visitLdcInsn("b");
    m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
    // if not equal "b", then goto second switch
    m.visitJumpInsn(Opcodes.IFEQ, secondSwitch);
    m.visitInsn(Opcodes.ICONST_2);
    m.visitVarInsn(Opcodes.ISTORE, 2);

    m.visitLabel(secondSwitch);
    expectedToInclusive = m.instructions.getLast();
    m.visitVarInsn(Opcodes.ILOAD, 2);
}

---

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