1 // ASM: a very small and fast Java bytecode manipulation framework 2 // Copyright (c) 2000-2011 INRIA, France Telecom 3 // All rights reserved. 4 // 5 // Redistribution and use in source and binary forms, with or without 6 // modification, are permitted provided that the following conditions 7 // are met: 8 // 1. Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // 2. Redistributions in binary form must reproduce the above copyright 11 // notice, this list of conditions and the following disclaimer in the 12 // documentation and/or other materials provided with the distribution. 13 // 3. Neither the name of the copyright holders nor the names of its 14 // contributors may be used to endorse or promote products derived from 15 // this software without specific prior written permission. 16 // 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 18 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 21 // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 // THE POSSIBILITY OF SUCH DAMAGE. 28 29 package org.objectweb.asm; 30 31 /** 32 * Information about the input stack map frame at the "current" instruction of a method. This is 33 * implemented as a Frame subclass for a "basic block" containing only one instruction. 34 * 35 * @author Eric Bruneton 36 */ 37 final class CurrentFrame extends Frame { 38 CurrentFrame(final Label owner)39 CurrentFrame(final Label owner) { 40 super(owner); 41 } 42 43 /** 44 * Sets this CurrentFrame to the input stack map frame of the next "current" instruction, i.e. the 45 * instruction just after the given one. It is assumed that the value of this object when this 46 * method is called is the stack map frame status just before the given instruction is executed. 47 */ 48 @Override execute( final int opcode, final int arg, final Symbol symbolArg, final SymbolTable symbolTable)49 void execute( 50 final int opcode, final int arg, final Symbol symbolArg, final SymbolTable symbolTable) { 51 super.execute(opcode, arg, symbolArg, symbolTable); 52 Frame successor = new Frame(null); 53 merge(symbolTable, successor, 0); 54 copyFrom(successor); 55 } 56 } 57