1 files changed, 172 insertions, 0 deletions
diff --git a/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/util/StringSharer.java b/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/util/StringSharer.java
new file mode 100644
index 0000000000..d2d5023dfa
--- /dev/null
+++ b/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/util/StringSharer.java
@@ -0,0 +1,172 @@
+/*
+ * 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.classfile.util;
+
+import proguard.classfile.*;
+import proguard.classfile.attribute.Attribute;
+import proguard.classfile.attribute.visitor.AttributeVisitor;
+import proguard.classfile.constant.*;
+import proguard.classfile.constant.visitor.ConstantVisitor;
+import proguard.classfile.visitor.ClassVisitor;
+
+/**
+ * This ClassVisitor shares strings in the class files that it visits.
+ *
+ * @author Eric Lafortune
+ */
+public class StringSharer
+extends      SimplifiedVisitor
+implements   ClassVisitor,
+             ConstantVisitor,
+             AttributeVisitor
+{
+    // A fields acting as an argument for the visitor methods.
+    private String name;
+    private String type;
+
+
+    // Implementations for ClassVisitor.
+
+    public void visitProgramClass(ProgramClass programClass)
+    {
+        // Replace name strings in the constant pool by shared strings.
+        programClass.constantPoolEntriesAccept(this);
+
+        // Replace attribute name strings in the constant pool by internalized
+        // strings.
+        programClass.attributesAccept(this);
+    }
+
+
+    public void visitLibraryClass(LibraryClass libraryClass)
+    {
+        // Replace the super class name string by the shared name string.
+        Clazz superClass = libraryClass.superClass;
+        if (superClass != null)
+        {
+            libraryClass.superClassName = superClass.getName();
+        }
+
+        // Replace the interface name strings by the shared name strings.
+        if (libraryClass.interfaceNames != null)
+        {
+            String[] interfaceNames   = libraryClass.interfaceNames;
+            Clazz[]  interfaceClasses = new Clazz[interfaceNames.length];
+
+            for (int index = 0; index < interfaceNames.length; index++)
+            {
+                // Keep a reference to the interface class.
+                Clazz interfaceClass = interfaceClasses[index];
+                if (interfaceClass != null)
+                {
+                    interfaceNames[index] = interfaceClass.getName();
+                }
+            }
+        }
+    }
+
+
+    // Implementations for ConstantVisitor.
+
+
+    public void visitAnyConstant(Clazz clazz, Constant constant) {}
+
+
+    public void visitStringConstant(Clazz clazz, StringConstant stringConstant)
+    {
+        Member referencedMember = stringConstant.referencedMember;
+        if (referencedMember != null)
+        {
+            Clazz referencedClass = stringConstant.referencedClass;
+
+            // Put the actual class member's name in the class pool.
+            name = referencedMember.getName(referencedClass);
+            clazz.constantPoolEntryAccept(stringConstant.u2stringIndex, this);
+        }
+    }
+
+
+    public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant)
+    {
+        Member referencedMember = refConstant.referencedMember;
+        if (referencedMember != null)
+        {
+            Clazz referencedClass = refConstant.referencedClass;
+
+            // Put the actual class member's name and type strings in the class
+            // pool.
+            name = referencedMember.getName(referencedClass);
+            type = referencedMember.getDescriptor(referencedClass);
+            clazz.constantPoolEntryAccept(refConstant.u2nameAndTypeIndex, this);
+        }
+    }
+
+
+    public void visitNameAndTypeConstant(Clazz clazz, NameAndTypeConstant nameAndTypeConstant)
+    {
+        if (name != null)
+        {
+            // Put the actual class member's name and type strings in the class
+            // pool.
+            clazz.constantPoolEntryAccept(nameAndTypeConstant.u2nameIndex, this);
+            name = type;
+            clazz.constantPoolEntryAccept(nameAndTypeConstant.u2descriptorIndex, this);
+        }
+    }
+
+
+    public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
+    {
+        Clazz referencedClass = classConstant.referencedClass;
+        if (referencedClass != null)
+        {
+            // Put the actual class's name string in the class pool.
+            name = referencedClass.getName();
+            clazz.constantPoolEntryAccept(classConstant.u2nameIndex, this);
+        }
+    }
+
+
+    public void visitUtf8Constant(Clazz clazz, Utf8Constant utf8Constant)
+    {
+        // Do we have a new string to put into this constant?
+        if (name != null)
+        {
+            // Replace the string, if it's actually the same.
+            if (name.equals(utf8Constant.getString()))
+            {
+                utf8Constant.setString(name);
+            }
+
+            name = null;
+        }
+    }
+
+
+    // Implementations for AttributeVisitor.
+
+    public void visitAnyAttribute(Clazz clazz, Attribute attribute)
+    {
+        // Put the internalized attribute's name string in the class pool.
+        name = attribute.getAttributeName(clazz).intern();
+        clazz.constantPoolEntryAccept(attribute.u2attributeNameIndex, this);
+    }
+}