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+/*
+ * 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);
+ }
+ }
+}