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Diffstat (limited to 'src/proguard/classfile/editor/VariableEditor.java')
-rw-r--r-- | src/proguard/classfile/editor/VariableEditor.java | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/src/proguard/classfile/editor/VariableEditor.java b/src/proguard/classfile/editor/VariableEditor.java deleted file mode 100644 index 2fd5471..0000000 --- a/src/proguard/classfile/editor/VariableEditor.java +++ /dev/null @@ -1,130 +0,0 @@ -/* - * 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.classfile.editor; - -import proguard.classfile.*; -import proguard.classfile.attribute.*; -import proguard.classfile.attribute.visitor.AttributeVisitor; -import proguard.classfile.util.SimplifiedVisitor; - -import java.util.Arrays; - -/** - * This AttributeVisitor accumulates specified changes to local variables, and - * then applies these accumulated changes to the code attributes that it visits. - * - * @author Eric Lafortune - */ -public class VariableEditor -extends SimplifiedVisitor -implements AttributeVisitor -{ - private boolean modified; - - private boolean[] deleted = new boolean[ClassConstants.TYPICAL_VARIABLES_SIZE]; - private int[] variableMap = new int[ClassConstants.TYPICAL_VARIABLES_SIZE]; - - private final VariableRemapper variableRemapper = new VariableRemapper(); - - - /** - * Resets the accumulated code changes. - * @param maxLocals the length of the local variable frame that will be - * edited next. - */ - public void reset(int maxLocals) - { - // Try to reuse the previous array. - if (deleted.length < maxLocals) - { - // Create a new array. - deleted = new boolean[maxLocals]; - } - else - { - // Reset the array. - Arrays.fill(deleted, 0, maxLocals, false); - } - - modified = false; - } - - - /** - * Remembers to delete the given variable. - * @param variableIndex the index of the variable to be deleted. - */ - public void deleteVariable(int variableIndex) - { - deleted[variableIndex] = true; - - modified = true; - } - - - /** - * Returns whether the given variable at the given offset has deleted. - */ - public boolean isDeleted(int instructionOffset) - { - return deleted[instructionOffset]; - } - - - // Implementations for AttributeVisitor. - - public void visitAnyAttribute(Clazz clazz, Attribute attribute) {} - - - public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute) - { - // Avoid doing any work if nothing is changing anyway. - if (!modified) - { - return; - } - - int oldMaxLocals = codeAttribute.u2maxLocals; - - // Make sure there is a sufficiently large variable map. - if (variableMap.length < oldMaxLocals) - { - variableMap = new int[oldMaxLocals]; - } - - // Fill out the variable map. - int newVariableIndex = 0; - for (int oldVariableIndex = 0; oldVariableIndex < oldMaxLocals; oldVariableIndex++) - { - variableMap[oldVariableIndex] = deleted[oldVariableIndex] ? - -1 : newVariableIndex++; - } - - // Set the map. - variableRemapper.setVariableMap(variableMap); - - // Remap the variables. - variableRemapper.visitCodeAttribute(clazz, method, codeAttribute); - - // Update the length of local variable frame. - codeAttribute.u2maxLocals = newVariableIndex; - } -} |