| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2011 Eric Lafortune (eric@graphics.cornell.edu) |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| package proguard.optimize; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.attribute.*; |
| import proguard.classfile.attribute.annotation.*; |
| import proguard.classfile.attribute.visitor.*; |
| import proguard.classfile.constant.*; |
| import proguard.classfile.constant.visitor.ConstantVisitor; |
| import proguard.classfile.editor.ConstantPoolEditor; |
| import proguard.classfile.util.*; |
| import proguard.classfile.visitor.MemberVisitor; |
| import proguard.optimize.info.*; |
| import proguard.optimize.peephole.VariableShrinker; |
| |
| /** |
| * This BootstrapMethodInfoVisitor removes unused constant arguments from |
| * bootstrap method entries that it visits. |
| * |
| * @see ParameterUsageMarker |
| * @see VariableUsageMarker |
| * @see VariableShrinker |
| * @author Eric Lafortune |
| */ |
| public class BootstrapMethodArgumentShrinker |
| extends SimplifiedVisitor |
| implements BootstrapMethodInfoVisitor, |
| ConstantVisitor, |
| MemberVisitor |
| { |
| private long usedParameters; |
| |
| |
| // Implementations for BootstrapMethodInfoVisitor. |
| |
| public void visitBootstrapMethodInfo(Clazz clazz, BootstrapMethodInfo bootstrapMethodInfo) |
| { |
| // Check which method parameters are used. |
| usedParameters = -1L; |
| clazz.constantPoolEntryAccept(bootstrapMethodInfo.u2methodHandleIndex, this); |
| |
| // Remove the unused arguments. |
| int methodArgumentCount = bootstrapMethodInfo.u2methodArgumentCount; |
| int[] methodArguments = bootstrapMethodInfo.u2methodArguments; |
| |
| int newArgumentIndex = 0; |
| |
| for (int argumentIndex = 0; argumentIndex < methodArgumentCount; argumentIndex++) |
| { |
| if (argumentIndex >= 64 || |
| (usedParameters & (1L << argumentIndex)) != 0L) |
| { |
| methodArguments[newArgumentIndex++] = methodArguments[argumentIndex]; |
| } |
| } |
| |
| // Update the number of arguments. |
| bootstrapMethodInfo.u2methodArgumentCount = newArgumentIndex; |
| } |
| |
| |
| // Implementations for ConstantVisitor. |
| |
| public void visitMethodHandleConstant(Clazz clazz, MethodHandleConstant methodHandleConstant) |
| { |
| // Check the referenced bootstrap method. |
| clazz.constantPoolEntryAccept(methodHandleConstant.u2referenceIndex, this); |
| } |
| |
| |
| public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant) |
| { |
| // Check the referenced class member itself. |
| refConstant.referencedMemberAccept(this); |
| } |
| |
| |
| // Implementations for MemberVisitor. |
| |
| public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) |
| { |
| usedParameters = ParameterUsageMarker.getUsedParameters(programMethod); |
| } |
| } |