| /* |
| * 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.attribute.preverification; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.attribute.CodeAttribute; |
| import proguard.classfile.attribute.preverification.visitor.StackMapFrameVisitor; |
| |
| /** |
| * This abstract class represents a stack map frame. Specific types |
| * of entries are subclassed from it. |
| * |
| * @author Eric Lafortune |
| */ |
| public abstract class StackMapFrame implements VisitorAccepter |
| { |
| public static final int SAME_ZERO_FRAME = 0; |
| public static final int SAME_ONE_FRAME = 64; |
| public static final int SAME_ONE_FRAME_EXTENDED = 247; |
| public static final int LESS_ZERO_FRAME = 248; |
| public static final int SAME_ZERO_FRAME_EXTENDED = 251; |
| public static final int MORE_ZERO_FRAME = 252; |
| public static final int FULL_FRAME = 255; |
| |
| |
| public int u2offsetDelta; |
| |
| /** |
| * An extra field in which visitors can store information. |
| */ |
| public Object visitorInfo; |
| |
| |
| |
| /** |
| * Returns the bytecode offset delta relative to the previous stack map |
| * frame. |
| */ |
| public int getOffsetDelta() |
| { |
| return u2offsetDelta; |
| } |
| |
| |
| // Abstract methods to be implemented by extensions. |
| |
| /** |
| * Returns the stack map frame tag that specifies the entry type. |
| */ |
| public abstract int getTag(); |
| |
| |
| /** |
| * Accepts the given visitor. |
| */ |
| public abstract void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, StackMapFrameVisitor stackMapFrameVisitor); |
| |
| |
| // Implementations for VisitorAccepter. |
| |
| public Object getVisitorInfo() |
| { |
| return visitorInfo; |
| } |
| |
| public void setVisitorInfo(Object visitorInfo) |
| { |
| this.visitorInfo = visitorInfo; |
| } |
| |
| |
| // Implementations for Object. |
| |
| public boolean equals(Object object) |
| { |
| if (object == null || |
| this.getClass() != object.getClass()) |
| { |
| return false; |
| } |
| |
| StackMapFrame other = (StackMapFrame)object; |
| |
| return this.u2offsetDelta == other.u2offsetDelta; |
| } |
| |
| |
| public int hashCode() |
| { |
| return getClass().hashCode() ^ |
| u2offsetDelta; |
| } |
| |
| |
| public String toString() |
| { |
| return "[" + u2offsetDelta + "] "; |
| } |
| } |