1 files changed, 103 insertions, 0 deletions
diff --git a/src/proguard/optimize/BootstrapMethodArgumentShrinker.java b/src/proguard/optimize/BootstrapMethodArgumentShrinker.java
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+++ b/src/proguard/optimize/BootstrapMethodArgumentShrinker.java
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+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2013 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);
+    }
+}