| /* |
| * 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.classfile.editor; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.attribute.*; |
| import proguard.classfile.attribute.visitor.AttributeVisitor; |
| import proguard.classfile.instruction.*; |
| import proguard.classfile.instruction.visitor.InstructionVisitor; |
| import proguard.classfile.util.*; |
| |
| /** |
| * This AttributeVisitor computes and updates the maximum local variable frame |
| * size of the code attributes that it visits. |
| * |
| * @author Eric Lafortune |
| */ |
| public class VariableSizeUpdater |
| extends SimplifiedVisitor |
| implements AttributeVisitor, |
| InstructionVisitor |
| { |
| //* |
| private static final boolean DEBUG = false; |
| /*/ |
| private static boolean DEBUG = true; |
| //*/ |
| |
| |
| // Implementations for AttributeVisitor. |
| |
| public void visitAnyAttribute(Clazz clazz, Attribute attribute) {} |
| |
| |
| public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute) |
| { |
| // DEBUG = |
| // clazz.getName().equals("abc/Def") && |
| // method.getName(clazz).equals("abc"); |
| |
| // The minimum variable size is determined by the arguments. |
| codeAttribute.u2maxLocals = |
| ClassUtil.internalMethodParameterSize(method.getDescriptor(clazz), |
| method.getAccessFlags()); |
| |
| if (DEBUG) |
| { |
| System.out.println("VariableSizeUpdater: "+clazz.getName()+"."+method.getName(clazz)+method.getDescriptor(clazz)); |
| System.out.println(" Max locals: "+codeAttribute.u2maxLocals+" <- parameters"); |
| } |
| |
| // Go over all instructions. |
| codeAttribute.instructionsAccept(clazz, method, this); |
| } |
| |
| |
| // Implementations for InstructionVisitor. |
| |
| public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {} |
| |
| |
| public void visitVariableInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, VariableInstruction variableInstruction) |
| { |
| int variableSize = variableInstruction.variableIndex + 1; |
| if (variableInstruction.isCategory2()) |
| { |
| variableSize++; |
| } |
| |
| if (codeAttribute.u2maxLocals < variableSize) |
| { |
| codeAttribute.u2maxLocals = variableSize; |
| |
| if (DEBUG) |
| { |
| System.out.println("Max locals: "+codeAttribute.u2maxLocals+" <- "+variableInstruction.toString(offset)); |
| } |
| } |
| } |
| } |