diff options
Diffstat (limited to 'src/proguard/obfuscate/Utf8Shrinker.java')
-rw-r--r-- | src/proguard/obfuscate/Utf8Shrinker.java | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/src/proguard/obfuscate/Utf8Shrinker.java b/src/proguard/obfuscate/Utf8Shrinker.java deleted file mode 100644 index 87ada80..0000000 --- a/src/proguard/obfuscate/Utf8Shrinker.java +++ /dev/null @@ -1,110 +0,0 @@ -/* - * ProGuard -- shrinking, optimization, obfuscation, and preverification - * of Java bytecode. - * - * Copyright (c) 2002-2009 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.obfuscate; - -import proguard.classfile.*; -import proguard.classfile.constant.Constant; -import proguard.classfile.editor.ConstantPoolRemapper; -import proguard.classfile.visitor.ClassVisitor; - - -/** - * This ClassVisitor removes UTF-8 constant pool entries that are not marked - * as being used. - * - * @see Utf8UsageMarker - * - * @author Eric Lafortune - */ -public class Utf8Shrinker implements ClassVisitor -{ - private int[] constantIndexMap = new int[ClassConstants.TYPICAL_CONSTANT_POOL_SIZE]; - private final ConstantPoolRemapper constantPoolRemapper = new ConstantPoolRemapper(); - - - // Implementations for ClassVisitor. - - public void visitProgramClass(ProgramClass programClass) - { - // Shift the used constant pool entries together, filling out the - // index map. - programClass.u2constantPoolCount = - shrinkConstantPool(programClass.constantPool, - programClass.u2constantPoolCount); - - // Remap all constant pool references. - constantPoolRemapper.setConstantIndexMap(constantIndexMap); - constantPoolRemapper.visitProgramClass(programClass); - } - - - public void visitLibraryClass(LibraryClass libraryClass) - { - } - - - // Small utility methods. - - /** - * Removes all UTF-8 entries that are not marked as being used - * from the given constant pool. - * @return the new number of entries. - */ - private int shrinkConstantPool(Constant[] constantPool, int length) - { - // Create a new index map, if necessary. - if (constantIndexMap.length < length) - { - constantIndexMap = new int[length]; - } - - int counter = 1; - boolean isUsed = false; - - // Shift the used constant pool entries together. - for (int index = 1; index < length; index++) - { - constantIndexMap[index] = counter; - - Constant constant = constantPool[index]; - - // Don't update the flag if this is the second half of a long entry. - if (constant != null) - { - isUsed = constant.getTag() != ClassConstants.CONSTANT_Utf8 || - Utf8UsageMarker.isUsed(constant); - } - - if (isUsed) - { - constantPool[counter++] = constant; - } - } - - // Clear the remaining constant pool elements. - for (int index = counter; index < length; index++) - { - constantPool[index] = null; - } - - return counter; - } -} |