1 files changed, 120 insertions, 0 deletions
diff --git a/third_party/java/proguard/proguard5.3.3/src/proguard/obfuscate/AttributeShrinker.java b/third_party/java/proguard/proguard5.3.3/src/proguard/obfuscate/AttributeShrinker.java
new file mode 100644
index 0000000000..1916797a37
--- /dev/null
+++ b/third_party/java/proguard/proguard5.3.3/src/proguard/obfuscate/AttributeShrinker.java
@@ -0,0 +1,120 @@
+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare
+ *
+ * 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.obfuscate;
+
+import proguard.classfile.*;
+import proguard.classfile.attribute.*;
+import proguard.classfile.attribute.visitor.AttributeVisitor;
+import proguard.classfile.util.SimplifiedVisitor;
+import proguard.classfile.visitor.*;
+
+import java.util.Arrays;
+
+/**
+ * This ClassVisitor removes attributes that are not marked as being used or
+ * required.
+ *
+ * @see AttributeUsageMarker
+ *
+ * @author Eric Lafortune
+ */
+public class AttributeShrinker
+extends      SimplifiedVisitor
+implements   ClassVisitor,
+             MemberVisitor,
+             AttributeVisitor
+{
+    // Implementations for ClassVisitor.
+
+    public void visitProgramClass(ProgramClass programClass)
+    {
+        // Compact the array for class attributes.
+        programClass.u2attributesCount =
+            shrinkArray(programClass.attributes,
+                        programClass.u2attributesCount);
+
+        // Compact the attributes in fields, methods, and class attributes,
+        programClass.fieldsAccept(this);
+        programClass.methodsAccept(this);
+        programClass.attributesAccept(this);
+    }
+
+
+    public void visitLibraryClass(LibraryClass libraryClass)
+    {
+        // Library classes are left unchanged.
+    }
+
+
+    // Implementations for MemberVisitor.
+
+    public void visitProgramMember(ProgramClass programClass, ProgramMember programMember)
+    {
+        // Compact the attributes array.
+        programMember.u2attributesCount =
+            shrinkArray(programMember.attributes,
+                        programMember.u2attributesCount);
+
+        // Compact any attributes of the remaining attributes.
+        programMember.attributesAccept(programClass, this);
+    }
+
+
+    // Implementations for AttributeVisitor.
+
+    public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
+
+
+    public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
+    {
+        // Compact the attributes array.
+        codeAttribute.u2attributesCount =
+            shrinkArray(codeAttribute.attributes,
+                        codeAttribute.u2attributesCount);
+    }
+
+
+    // Small utility methods.
+
+    /**
+     * Removes all VisitorAccepter objects that are not marked as being used
+     * from the given array.
+     * @return the new number of VisitorAccepter objects.
+     */
+    private static int shrinkArray(VisitorAccepter[] array, int length)
+    {
+        int counter = 0;
+
+        // Shift the used objects together.
+        for (int index = 0; index < length; index++)
+        {
+            if (AttributeUsageMarker.isUsed(array[index]))
+            {
+                array[counter++] = array[index];
+            }
+        }
+
+        // Clear the remaining array elements.
+        Arrays.fill(array, counter, length, null);
+
+        return counter;
+    }
+}