Example usage for org.objectweb.asm MethodVisitor visitJumpInsn

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.spongepowered.lantern.event.filter.delegate.FirstCauseFilterSourceDelegate.java

License:MIT License

@Override
protected void insertCheck(MethodVisitor mv, Parameter param, Class<?> targetType, int local) {
    mv.visitVarInsn(ALOAD, local);/*from   ww w. j  av  a  2 s.  c om*/
    Label success = new Label();
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/util/Optional", "isPresent", "()Z", false);
    mv.visitJumpInsn(IFNE, success);
    mv.visitInsn(ACONST_NULL);
    mv.visitInsn(ARETURN);
    mv.visitLabel(success);
}

---

From source file:org.spongepowered.lantern.event.filter.delegate.RootCauseFilterSourceDelegate.java

License:MIT License

@Override
protected void insertCheck(MethodVisitor mv, Parameter param, Class<?> targetType, int local) {
    Label failure = new Label();
    Label success = new Label();
    mv.visitVarInsn(ALOAD, local);/*  www  . j  a  v a2 s  .  c  om*/
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/util/Optional", "isPresent", "()Z", false);
    mv.visitJumpInsn(IFEQ, failure);
    mv.visitLdcInsn(Type.getType(targetType));
    mv.visitVarInsn(ALOAD, local);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/util/Optional", "get", "()Ljava/lang/Object;", false);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;", false);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "isAssignableFrom", "(Ljava/lang/Class;)Z", false);
    mv.visitJumpInsn(IFNE, success);
    mv.visitLabel(failure);
    mv.visitInsn(ACONST_NULL);
    mv.visitInsn(ARETURN);
    mv.visitLabel(success);
}

---

From source file:org.spongepowered.mod.event.HandlerClassFactory.java

License:MIT License

public byte[] generateClass(Class<?> objectClass, Method method, Class<?> eventClass, boolean ignoreCancelled,
        String className) {//ww w .  j  a  va 2 s.com
    ClassWriter cw = new ClassWriter(COMPUTE_FRAMES | COMPUTE_MAXS);
    FieldVisitor fv;
    MethodVisitor mv;

    String createdInternalName = className.replace(".", "/");
    String invokedInternalName = Type.getInternalName(objectClass);
    String eventInternalName = Type.getInternalName(eventClass);

    cw.visit(Opcodes.V1_6, ACC_PUBLIC + ACC_SUPER, createdInternalName, null, "java/lang/Object",
            new String[] { Type.getInternalName(Handler.class) });

    {
        fv = cw.visitField(ACC_PRIVATE + ACC_FINAL, "object", "L" + invokedInternalName + ";", null, null);
        fv.visitEnd();
    }
    {
        fv = cw.visitField(ACC_PRIVATE + ACC_FINAL, "method", "Ljava/lang/reflect/Method;", null, null);
        fv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "(L" + invokedInternalName + ";Ljava/lang/reflect/Method;)V",
                null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitFieldInsn(PUTFIELD, createdInternalName, "object", "L" + invokedInternalName + ";");
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitFieldInsn(PUTFIELD, createdInternalName, "method", "Ljava/lang/reflect/Method;");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "handle", "(Lorg/spongepowered/api/util/event/Event;)V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, createdInternalName, "object", "L" + invokedInternalName + ";");
        mv.visitVarInsn(ALOAD, 1);
        mv.visitTypeInsn(CHECKCAST, eventInternalName);
        mv.visitMethodInsn(INVOKEVIRTUAL, "" + invokedInternalName + "", method.getName(),
                "(L" + eventInternalName + ";)V", false);
        mv.visitInsn(RETURN);
        mv.visitMaxs(2, 2);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "equals", "(Ljava/lang/Object;)Z", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(ALOAD, 1);
        Label l0 = new Label();
        mv.visitJumpInsn(IF_ACMPNE, l0);
        mv.visitInsn(ICONST_1);
        mv.visitInsn(IRETURN);
        mv.visitLabel(l0);
        mv.visitVarInsn(ALOAD, 1);
        Label l1 = new Label();
        mv.visitJumpInsn(IFNULL, l1);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;", false);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;", false);
        Label l2 = new Label();
        mv.visitJumpInsn(IF_ACMPEQ, l2);
        mv.visitLabel(l1);
        mv.visitInsn(ICONST_0);
        mv.visitInsn(IRETURN);
        mv.visitLabel(l2);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitTypeInsn(CHECKCAST, createdInternalName);
        mv.visitVarInsn(ASTORE, 2);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, createdInternalName, "method", "Ljava/lang/reflect/Method;");
        mv.visitVarInsn(ALOAD, 2);
        mv.visitFieldInsn(GETFIELD, createdInternalName, "method", "Ljava/lang/reflect/Method;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "equals", "(Ljava/lang/Object;)Z", false);
        Label l3 = new Label();
        mv.visitJumpInsn(IFNE, l3);
        mv.visitInsn(ICONST_0);
        mv.visitInsn(IRETURN);
        mv.visitLabel(l3);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, createdInternalName, "object", "L" + invokedInternalName + ";");
        mv.visitVarInsn(ALOAD, 2);
        mv.visitFieldInsn(GETFIELD, createdInternalName, "object", "L" + invokedInternalName + ";");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z", false);
        Label l4 = new Label();
        mv.visitJumpInsn(IFNE, l4);
        mv.visitInsn(ICONST_0);
        mv.visitInsn(IRETURN);
        mv.visitLabel(l4);
        mv.visitInsn(ICONST_1);
        mv.visitInsn(IRETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "hashCode", "()I", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, createdInternalName, "object", "L" + invokedInternalName + ";");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "hashCode", "()I", false);
        mv.visitVarInsn(ISTORE, 1);
        mv.visitIntInsn(BIPUSH, 31);
        mv.visitVarInsn(ILOAD, 1);
        mv.visitInsn(IMUL);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, createdInternalName, "method", "Ljava/lang/reflect/Method;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "hashCode", "()I", false);
        mv.visitInsn(IADD);
        mv.visitVarInsn(ISTORE, 1);
        mv.visitVarInsn(ILOAD, 1);
        mv.visitInsn(IRETURN);
        mv.visitMaxs(2, 2);
        mv.visitEnd();
    }
    cw.visitEnd();

    return cw.toByteArray();
}

---

From source file:org.spongepowered.test.decompile.DoWhileTests.java

License:Open Source License

@Test
public void testDoWhile() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(I)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);//from   www  . j  a v a2 s  . c  o  m
    Label end = new Label();
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitVarInsn(ILOAD, 0);
    mv.visitInsn(ICONST_5);
    mv.visitJumpInsn(IF_ICMPLT, l1);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("i", "I", null, start, end, 0);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "do {\n" + "    org.spongepowered.test.decompile.DoWhileTests.body();\n" + "} while (i < 5);";
    Assert.assertEquals(good, insn);
}

---

From source file:org.spongepowered.test.decompile.DoWhileTests.java

License:Open Source License

@Test
public void testDoWhileAnd() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZZ)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);//from   w  w  w .  jav  a2s .com
    Label end = new Label();
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitVarInsn(ILOAD, 0);
    mv.visitJumpInsn(IFEQ, end);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitJumpInsn(IFNE, l1);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("a", "Z", null, start, end, 0);
    mv.visitLocalVariable("b", "Z", null, start, end, 1);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "do {\n" + "    org.spongepowered.test.decompile.DoWhileTests.body();\n"
            + "} while (a && b);";
    Assert.assertEquals(good, insn);
}

---

From source file:org.spongepowered.test.decompile.DoWhileTests.java

License:Open Source License

@Test
public void testDoWhileOr() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZZ)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);//from   w  w w.j a  va 2 s.co  m
    Label end = new Label();
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitVarInsn(ILOAD, 0);
    mv.visitJumpInsn(IFNE, l1);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitJumpInsn(IFNE, l1);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("a", "Z", null, start, end, 0);
    mv.visitLocalVariable("b", "Z", null, start, end, 1);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "do {\n" + "    org.spongepowered.test.decompile.DoWhileTests.body();\n"
            + "} while (a || b);";
    Assert.assertEquals(good, insn);
}

---

From source file:org.spongepowered.test.decompile.DoWhileTests.java

License:Open Source License

@Test
public void testDoWhileBreak() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(IZ)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);/* w  ww . ja v  a 2s .  c  om*/
    Label end = new Label();
    Label l1 = new Label();
    Label l2 = new Label();
    mv.visitLabel(l1);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitJumpInsn(IFEQ, l2);
    mv.visitJumpInsn(GOTO, end);
    mv.visitLabel(l2);
    mv.visitVarInsn(ILOAD, 0);
    mv.visitInsn(ICONST_5);
    mv.visitJumpInsn(IF_ICMPLT, l1);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("i", "I", null, start, end, 0);
    mv.visitLocalVariable("a", "Z", null, start, end, 1);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "do {\n" + "    org.spongepowered.test.decompile.DoWhileTests.body();\n" + "    if (a) {\n"
            + "        break;\n" + "    }\n" + "} while (i < 5);";
    Assert.assertEquals(good, insn);
}

---

From source file:org.spongepowered.test.decompile.DoWhileTests.java

License:Open Source License

public void testDoWhileContinue() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(IZ)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);/* w  w  w. j a  v a  2  s  . com*/
    Label end = new Label();
    Label l1 = new Label();
    Label l2 = new Label();
    mv.visitLabel(l1);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitJumpInsn(IFEQ, l2);
    mv.visitJumpInsn(GOTO, l1);
    mv.visitLabel(l2);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitVarInsn(ILOAD, 0);
    mv.visitInsn(ICONST_5);
    mv.visitJumpInsn(IF_ICMPLT, l1);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("i", "I", null, start, end, 0);
    mv.visitLocalVariable("a", "Z", null, start, end, 1);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "do {\n" + "    DoWhileTests.body();\n" + "    if (a) {\n" + "        continue;\n" + "    }\n"
            + "    DoWhileTests.body();\n" + "} while (i < 5);";
    Assert.assertEquals(good, insn);
}

---

From source file:org.spongepowered.test.decompile.IfTests.java

License:Open Source License

@Test
public void testSimple() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(Z)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);/*  ww w  . j a  v a 2 s  . co m*/
    Label end = new Label();
    mv.visitVarInsn(ILOAD, 0);
    mv.visitJumpInsn(IFEQ, end);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("a", "Z", null, start, end, 0);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "if (a) {\n" + "    org.spongepowered.test.decompile.IfTests.body();\n" + "}";
    Assert.assertEquals(good, insn);
}

---

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