diff options
Diffstat (limited to 'src/proguard/optimize/evaluation/SimpleEnumArrayPropagator.java')
-rw-r--r-- | src/proguard/optimize/evaluation/SimpleEnumArrayPropagator.java | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/src/proguard/optimize/evaluation/SimpleEnumArrayPropagator.java b/src/proguard/optimize/evaluation/SimpleEnumArrayPropagator.java new file mode 100644 index 0000000..d6aaf7d --- /dev/null +++ b/src/proguard/optimize/evaluation/SimpleEnumArrayPropagator.java @@ -0,0 +1,94 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2014 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.evaluation; + +import proguard.classfile.*; +import proguard.classfile.util.SimplifiedVisitor; +import proguard.classfile.visitor.*; +import proguard.evaluation.value.*; +import proguard.optimize.info.*; + +/** + * This ClassVisitor propagates the value of the $VALUES field to the values() + * method in the simple enum classes that it visits. + * + * @see SimpleEnumMarker + * @author Eric Lafortune + */ +public class SimpleEnumArrayPropagator +extends SimplifiedVisitor +implements ClassVisitor, + MemberVisitor +{ + private final ValueFactory valueFactory = new ParticularValueFactory(); + + private Value array; + + + // Implementations for ClassVisitor. + + public void visitProgramClass(ProgramClass programClass) + { + // Update the return value of the "int[] values()" method. + programClass.methodsAccept(new MemberDescriptorFilter("()[I", this)); + } + + + // Implementations for MemberVisitor. + + public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) + { + // Find the array length of the "int[] $VALUES" field. + programClass.fieldsAccept(new MemberDescriptorFilter("[I", this)); + + if (array != null) + { + // Set the array value with the found array length. We can't use + // the original array, because its elements might get overwritten. + Value propagatedArray = + valueFactory.createArrayReferenceValue("I", + null, + array.referenceValue().arrayLength( + valueFactory)); + + setMethodReturnValue(programMethod, propagatedArray); + + array = null; + } + } + + public void visitProgramField(ProgramClass programClass, ProgramField programField) + { + array = StoringInvocationUnit.getFieldValue(programField); + } + + + // Small utility methods. + + private static void setMethodReturnValue(Method method, Value value) + { + MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); + if (info != null) + { + info.setReturnValue(value); + } + } +} |