Examples of org.ow2.asm.Label

org.ow2.asm.Label
A label represents a position in the bytecode of a method. Labels are used for jump, goto, and switch instructions, and for try catch blocks. A label designates the instruction that is just after. Note however that there can be other elements between a label and the instruction it designates (such as other labels, stack map frames, line numbers, etc.). @author Eric Bruneton


    public void testIllegalTableSwitchParameters1() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitTableSwitchInsn(1, 0, new Label(), new Label[0]);
            fail();
        } catch (Exception e) {
        }
    }

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    public void testIllegalTableSwitchParameters3() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitTableSwitchInsn(0, 1, new Label(), (Label[])null);
            fail();
        } catch (Exception e) {
        }
    }

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    public void testIllegalTableSwitchParameters4() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitTableSwitchInsn(0, 1, new Label(), new Label[0]);
            fail();
        } catch (Exception e) {
        }
    }

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    public void testIllegalLookupSwitchParameters1() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitLookupSwitchInsn(new Label(), null, new Label[0]);
            fail();
        } catch (Exception e) {
        }
    }

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    public void testIllegalLookupSwitchParameters2() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitLookupSwitchInsn(new Label(), new int[0], null);
            fail();
        } catch (Exception e) {
        }
    }

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    public void testIllegalLookupSwitchParameters3() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitLookupSwitchInsn(new Label(), new int[0], new Label[1]);
            fail();
        } catch (Exception e) {
        }
    }

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    }


    public void testIllegalTryCatchBlock() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        Label m = new Label();
        Label n = new Label();
        mv.visitLabel(m);
        try {
            mv.visitTryCatchBlock(m, n, n, null);
            fail();
        } catch (Exception e) {

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    }


    public void testIllegalLocalVariableLabels() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        Label m = new Label();
        Label n = new Label();
        mv.visitLabel(n);
        mv.visitInsn(NOP);
        mv.visitLabel(m);
        try {
            mv.visitLocalVariable("i", "I", null, m, n, 0);

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    public void testIllegalLineNumerLabel() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitLineNumber(0, new Label());
            fail();
        } catch (Exception e) {
        }
    }

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        mv.visitMaxs(0, 0);
        mv.visitEnd();


        mv = cw.visitMethod(ACC_PUBLIC, "wideLocals", "(I)I", null, null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        mv.visitJumpInsn(GOTO, l1); // will give GOTO_W


        mv.visitLabel(l0);
        mv.visitIincInsn(300, 1); // covers 'update maxlocals' in MethodWriter
        mv.visitVarInsn(ILOAD, 300); // will give wide form

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