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-rw-r--r--src/proguard/classfile/editor/VariableEditor.java130
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diff --git a/src/proguard/classfile/editor/VariableEditor.java b/src/proguard/classfile/editor/VariableEditor.java
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--- a/src/proguard/classfile/editor/VariableEditor.java
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-/*
- * 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;
- }
-}