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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 static java.lang.String.format;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* Constants and utilities for byte code instrumentation.
*/
public final class InstrSupport {
private InstrSupport() {
}
// === Data Field ===
/**
* Name of the field that stores coverage information of a class.
*/
public static final String DATAFIELD_NAME = "$jacocoData";
/**
* Access modifiers of the field that stores coverage information of a
* class.
*/
public static final int DATAFIELD_ACC = Opcodes.ACC_SYNTHETIC
| Opcodes.ACC_PRIVATE | Opcodes.ACC_STATIC | Opcodes.ACC_TRANSIENT
| Opcodes.ACC_FINAL;
/**
* Access modifiers of the field that stores coverage information of a Java
* 8 interface.
*/
public static final int DATAFIELD_INTF_ACC = Opcodes.ACC_SYNTHETIC
| Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC | Opcodes.ACC_FINAL;
/**
* Data type of the field that stores coverage information for a class (
* <code>boolean[]</code>).
*/
public static final String DATAFIELD_DESC = "[Z";
// === Init Method ===
/**
* Name of the initialization method.
*/
public static final String INITMETHOD_NAME = "$jacocoInit";
/**
* Descriptor of the initialization method.
*/
public static final String INITMETHOD_DESC = "()[Z";
/**
* Access modifiers of the initialization method.
*/
public static final int INITMETHOD_ACC = Opcodes.ACC_SYNTHETIC
| Opcodes.ACC_PRIVATE | Opcodes.ACC_STATIC;
/**
* Ensures that the given member does not correspond to a internal member
* created by the instrumentation process. This would mean that the class is
* already instrumented.
*
* @param member
* name of the member to check
* @param owner
* name of the class owning the member
* @throws IllegalStateException
* thrown if the member has the same name than the
* instrumentation member
*/
public static void assertNotInstrumented(final String member,
final String owner) throws IllegalStateException {
if (member.equals(DATAFIELD_NAME) || member.equals(INITMETHOD_NAME)) {
throw new IllegalStateException(format(
"Class %s is already instrumented.", owner));
}
}
/**
* Generates the instruction to push the given int value on the stack.
* Implementation taken from
* {@link org.objectweb.asm.commons.GeneratorAdapter#push(int)}.
*
* @param mv
* visitor to emit the instruction
* @param value
* the value to be pushed on the stack.
*/
public static void push(final MethodVisitor mv, final int value) {
if (value >= -1 && value <= 5) {
mv.visitInsn(Opcodes.ICONST_0 + value);
} else if (value >= Byte.MIN_VALUE && value <= Byte.MAX_VALUE) {
mv.visitIntInsn(Opcodes.BIPUSH, value);
} else if (value >= Short.MIN_VALUE && value <= Short.MAX_VALUE) {
mv.visitIntInsn(Opcodes.SIPUSH, value);
} else {
mv.visitLdcInsn(Integer.valueOf(value));
}
}
}
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