org.jacoco.core.internal.instr.DuplicateFrameEliminator.java Source code

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Here is the source code for org.jacoco.core.internal.instr.DuplicateFrameEliminator.java

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/*******************************************************************************
 * Copyright (c) 2009, 2013 Mountainminds GmbH & Co. KG and Contributors
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Marc R. Hoffmann - initial API and implementation
 *    
 *******************************************************************************/
package org.jacoco.core.internal.instr;

import org.objectweb.asm.Handle;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

/**
 * Eliminates consecutive stackmap frame definitions which causes ASM to create
 * invalid class files. This situation occurs when the original class files
 * contains additional stackmap frames at unexpected offsets, which is case for
 * some class files compiled with ECJ.
 */
class DuplicateFrameEliminator extends MethodVisitor {

    private boolean instruction;

    public DuplicateFrameEliminator(final MethodVisitor mv) {
        super(Opcodes.ASM4, mv);
        instruction = true;
    }

    @Override
    public void visitFrame(final int type, final int nLocal, final Object[] local, final int nStack,
            final Object[] stack) {
        if (instruction) {
            instruction = false;
            mv.visitFrame(type, nLocal, local, nStack, stack);
        }
    }

    @Override
    public void visitInsn(final int opcode) {
        instruction = true;
        mv.visitInsn(opcode);
    }

    @Override
    public void visitIntInsn(final int opcode, final int operand) {
        instruction = true;
        mv.visitIntInsn(opcode, operand);
    }

    @Override
    public void visitVarInsn(final int opcode, final int var) {
        instruction = true;
        mv.visitVarInsn(opcode, var);
    }

    @Override
    public void visitTypeInsn(final int opcode, final String type) {
        instruction = true;
        mv.visitTypeInsn(opcode, type);
    }

    @Override
    public void visitFieldInsn(final int opcode, final String owner, final String name, final String desc) {
        instruction = true;
        mv.visitFieldInsn(opcode, owner, name, desc);
    }

    @Override
    public void visitMethodInsn(final int opcode, final String owner, final String name, final String desc) {
        instruction = true;
        mv.visitMethodInsn(opcode, owner, name, desc);
    }

    @Override
    public void visitInvokeDynamicInsn(final String name, final String desc, final Handle bsm,
            final Object... bsmArgs) {
        instruction = true;
        mv.visitInvokeDynamicInsn(name, desc, bsm, bsmArgs);
    }

    @Override
    public void visitJumpInsn(final int opcode, final Label label) {
        instruction = true;
        mv.visitJumpInsn(opcode, label);
    }

    @Override
    public void visitLdcInsn(final Object cst) {
        instruction = true;
        mv.visitLdcInsn(cst);
    }

    @Override
    public void visitIincInsn(final int var, final int increment) {
        instruction = true;
        mv.visitIincInsn(var, increment);
    }

    @Override
    public void visitTableSwitchInsn(final int min, final int max, final Label dflt, final Label... labels) {
        instruction = true;
        mv.visitTableSwitchInsn(min, max, dflt, labels);
    }

    @Override
    public void visitLookupSwitchInsn(final Label dflt, final int[] keys, final Label[] labels) {
        instruction = true;
        mv.visitLookupSwitchInsn(dflt, keys, labels);
    }

    @Override
    public void visitMultiANewArrayInsn(final String desc, final int dims) {
        instruction = true;
        mv.visitMultiANewArrayInsn(desc, dims);
    }

}