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/*******************************************************************************
* Copyright (c) 2009, 2016 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.jacoco.core.JaCoCo;
import org.objectweb.asm.Handle;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
/**
* 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(JaCoCo.ASM_API_VERSION, 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, final boolean itf) {
instruction = true;
mv.visitMethodInsn(opcode, owner, name, desc, itf);
}
@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);
}
}
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