DuplicateFrameEliminator.java revision 049e60404d6797c8131addbc4e10b853be7bb1c6 
1/*******************************************************************************
2 * Copyright (c) 2009, 2012 Mountainminds GmbH & Co. KG and Contributors
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 *    Marc R. Hoffmann - initial API and implementation
10 *
11 *******************************************************************************/
12package org.jacoco.core.internal.instr;
13
14import org.objectweb.asm.Label;
15import org.objectweb.asm.MethodAdapter;
16import org.objectweb.asm.MethodVisitor;
17
18/**
19 * Eliminates consecutive stackmap frame definitions which causes ASM to create
20 * invalid class files. This situation occurs when the original class files
21 * contains additional stackmap frames at unexpected offsets, which is case for
22 * some class files compiled with ECJ.
23 */
24class DuplicateFrameEliminator extends MethodAdapter {
25
26	private boolean instruction;
27
28	public DuplicateFrameEliminator(final MethodVisitor mv) {
29		super(mv);
30		instruction = true;
31	}
32
33	@Override
34	public void visitFrame(final int type, final int nLocal,
35			final Object[] local, final int nStack, final Object[] stack) {
36		if (instruction) {
37			instruction = false;
38			mv.visitFrame(type, nLocal, local, nStack, stack);
39		}
40	}
41
42	@Override
43	public void visitInsn(final int opcode) {
44		instruction = true;
45		mv.visitInsn(opcode);
46	}
47
48	@Override
49	public void visitIntInsn(final int opcode, final int operand) {
50		instruction = true;
51		mv.visitIntInsn(opcode, operand);
52	}
53
54	@Override
55	public void visitVarInsn(final int opcode, final int var) {
56		instruction = true;
57		mv.visitVarInsn(opcode, var);
58	}
59
60	@Override
61	public void visitTypeInsn(final int opcode, final String type) {
62		instruction = true;
63		mv.visitTypeInsn(opcode, type);
64	}
65
66	@Override
67	public void visitFieldInsn(final int opcode, final String owner,
68			final String name, final String desc) {
69		instruction = true;
70		mv.visitFieldInsn(opcode, owner, name, desc);
71	}
72
73	@Override
74	public void visitMethodInsn(final int opcode, final String owner,
75			final String name, final String desc) {
76		instruction = true;
77		mv.visitMethodInsn(opcode, owner, name, desc);
78	}
79
80	@Override
81	public void visitJumpInsn(final int opcode, final Label label) {
82		instruction = true;
83		mv.visitJumpInsn(opcode, label);
84	}
85
86	@Override
87	public void visitLdcInsn(final Object cst) {
88		instruction = true;
89		mv.visitLdcInsn(cst);
90	}
91
92	@Override
93	public void visitIincInsn(final int var, final int increment) {
94		instruction = true;
95		mv.visitIincInsn(var, increment);
96	}
97
98	@Override
99	public void visitTableSwitchInsn(final int min, final int max,
100			final Label dflt, final Label[] labels) {
101		instruction = true;
102		mv.visitTableSwitchInsn(min, max, dflt, labels);
103	}
104
105	@Override
106	public void visitLookupSwitchInsn(final Label dflt, final int[] keys,
107			final Label[] labels) {
108		instruction = true;
109		mv.visitLookupSwitchInsn(dflt, keys, labels);
110	}
111
112	@Override
113	public void visitMultiANewArrayInsn(final String desc, final int dims) {
114		instruction = true;
115		mv.visitMultiANewArrayInsn(desc, dims);
116	}
117
118}
119