| /******************************************************************************* |
| * Copyright (c) 2009, 2018 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.runtime.IExecutionDataAccessorGenerator; |
| import org.objectweb.asm.ClassVisitor; |
| import org.objectweb.asm.Label; |
| import org.objectweb.asm.MethodVisitor; |
| import org.objectweb.asm.Opcodes; |
| |
| /** |
| * The strategy for regular classes adds a static field to hold the probe array |
| * and a static initialization method requesting the probe array from the |
| * runtime. |
| */ |
| class ClassFieldProbeArrayStrategy implements IProbeArrayStrategy { |
| |
| /** |
| * Frame stack with a single boolean array. |
| */ |
| private static final Object[] FRAME_STACK_ARRZ = new Object[] { InstrSupport.DATAFIELD_DESC }; |
| |
| /** |
| * Empty frame locals. |
| */ |
| private static final Object[] FRAME_LOCALS_EMPTY = new Object[0]; |
| |
| private final String className; |
| private final long classId; |
| private final boolean withFrames; |
| private final IExecutionDataAccessorGenerator accessorGenerator; |
| |
| ClassFieldProbeArrayStrategy(final String className, final long classId, |
| final boolean withFrames, |
| final IExecutionDataAccessorGenerator accessorGenerator) { |
| this.className = className; |
| this.classId = classId; |
| this.withFrames = withFrames; |
| this.accessorGenerator = accessorGenerator; |
| } |
| |
| public int storeInstance(final MethodVisitor mv, final boolean clinit, |
| final int variable) { |
| mv.visitMethodInsn(Opcodes.INVOKESTATIC, className, |
| InstrSupport.INITMETHOD_NAME, InstrSupport.INITMETHOD_DESC, |
| false); |
| mv.visitVarInsn(Opcodes.ASTORE, variable); |
| return 1; |
| } |
| |
| public void addMembers(final ClassVisitor cv, final int probeCount) { |
| createDataField(cv); |
| createInitMethod(cv, probeCount); |
| } |
| |
| private void createDataField(final ClassVisitor cv) { |
| cv.visitField(InstrSupport.DATAFIELD_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 = genInitializeDataField(mv, probeCount); |
| |
| // Stack[0]: [Z |
| |
| // Return the class' probe array: |
| if (withFrames) { |
| 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(); |
| } |
| |
| /** |
| * Generates the byte code to initialize the static coverage data field |
| * within this class. |
| * |
| * The code will push the [Z data array on the operand stack. |
| * |
| * @param mv |
| * generator to emit code to |
| */ |
| private int genInitializeDataField(final MethodVisitor mv, |
| final int probeCount) { |
| final int size = 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 |
| |
| return Math.max(size, 2); // Maximum local stack size is 2 |
| } |
| |
| } |