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/*******************************************************************************
* Copyright (c) 2009, 2021 Mountainminds GmbH & Co. KG and Contributors
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Evgeny Mandrikov - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.instr;
import org.jacoco.core.runtime.IExecutionDataAccessorGenerator;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* This strategy for Java 8 interfaces adds a static method requesting the probe
* array from the runtime, a static field to hold the probe array and adds code
* for its initialization into interface initialization method.
*/
class InterfaceFieldProbeArrayStrategy implements IProbeArrayStrategy {
/**
* Frame stack with a single boolean array.
*/
private static final Object[] FRAME_STACK_ARRZ = new Object[] {
InstrSupport.DATAFIELD_DESC_UNQUALIFIED };
/**
* Empty frame locals.
*/
private static final Object[] FRAME_LOCALS_EMPTY = new Object[0];
private final String className;
private final long classId;
private final int probeCount;
private final IExecutionDataAccessorGenerator accessorGenerator;
private boolean seenClinit = false;
InterfaceFieldProbeArrayStrategy(final String className, final long classId,
final int probeCount,
final IExecutionDataAccessorGenerator accessorGenerator) {
this.className = className;
this.classId = classId;
this.probeCount = probeCount;
this.accessorGenerator = accessorGenerator;
}
public int storeInstance(final MethodVisitor mv, final boolean clinit,
final int variable) {
if (clinit) {
final int maxStack = accessorGenerator.generateDataAccessor(classId,
className, probeCount, mv);
// Stack[0]: [Z
mv.visitInsn(Opcodes.DUP);
// Stack[1]: [Z
// Stack[0]: [Z
mv.visitFieldInsn(Opcodes.PUTSTATIC, className,
InstrSupport.DATAFIELD_NAME, InstrSupport.DATAFIELD_DESC);
// Stack[0]: [Z
mv.visitVarInsn(Opcodes.ASTORE, variable);
seenClinit = true;
return Math.max(maxStack, 2);
} else {
mv.visitMethodInsn(Opcodes.INVOKESTATIC, className,
InstrSupport.INITMETHOD_NAME, InstrSupport.INITMETHOD_DESC,
true);
mv.visitVarInsn(Opcodes.ASTORE, variable);
return 1;
}
}
public void addMembers(final ClassVisitor cv, final int probeCount) {
createDataField(cv);
createInitMethod(cv, probeCount);
if (!seenClinit) {
createClinitMethod(cv, probeCount);
}
}
private void createDataField(final ClassVisitor cv) {
cv.visitField(InstrSupport.DATAFIELD_INTF_ACC,
InstrSupport.DATAFIELD_NAME, InstrSupport.DATAFIELD_DESC, null,
null);
}
private void createInitMethod(final ClassVisitor cv, final int probeCount) {
final MethodVisitor mv = cv.visitMethod(InstrSupport.INITMETHOD_ACC,
InstrSupport.INITMETHOD_NAME, InstrSupport.INITMETHOD_DESC,
null, null);
mv.visitCode();
// Load the value of the static data field:
mv.visitFieldInsn(Opcodes.GETSTATIC, className,
InstrSupport.DATAFIELD_NAME, InstrSupport.DATAFIELD_DESC);
mv.visitInsn(Opcodes.DUP);
// Stack[1]: [Z
// Stack[0]: [Z
// Skip initialization when we already have a data array:
final Label alreadyInitialized = new Label();
mv.visitJumpInsn(Opcodes.IFNONNULL, alreadyInitialized);
// Stack[0]: [Z
mv.visitInsn(Opcodes.POP);
final int size = accessorGenerator.generateDataAccessor(classId,
className, probeCount, mv);
// Stack[0]: [Z
// Return the class' probe array:
mv.visitFrame(Opcodes.F_NEW, 0, FRAME_LOCALS_EMPTY, 1,
FRAME_STACK_ARRZ);
mv.visitLabel(alreadyInitialized);
mv.visitInsn(Opcodes.ARETURN);
mv.visitMaxs(Math.max(size, 2), 0); // Maximum local stack size is 2
mv.visitEnd();
}
private void createClinitMethod(final ClassVisitor cv,
final int probeCount) {
final MethodVisitor mv = cv.visitMethod(InstrSupport.CLINIT_ACC,
InstrSupport.CLINIT_NAME, InstrSupport.CLINIT_DESC, null, null);
mv.visitCode();
final int maxStack = accessorGenerator.generateDataAccessor(classId,
className, probeCount, mv);
// Stack[0]: [Z
mv.visitFieldInsn(Opcodes.PUTSTATIC, className,
InstrSupport.DATAFIELD_NAME, InstrSupport.DATAFIELD_DESC);
mv.visitInsn(Opcodes.RETURN);
mv.visitMaxs(maxStack, 0);
mv.visitEnd();
}
}
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