1 /* 2 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.debugger.cdbg.basic.x86; 26 27 import sun.jvm.hotspot.debugger.*; 28 import sun.jvm.hotspot.debugger.cdbg.*; 29 import sun.jvm.hotspot.debugger.cdbg.basic.*; 30 31 /** Basic X86 frame functionality providing sender() functionality. */ 32 33 public class X86CFrame extends BasicCFrame { 34 private Address ebp; 35 private Address pc; 36 37 private static final int ADDRESS_SIZE = 4; 38 39 /** Constructor for topmost frame */ 40 public X86CFrame(CDebugger dbg, Address ebp, Address pc) { 41 super(dbg); 42 this.ebp = ebp; 43 this.pc = pc; 44 } 45 46 public CFrame sender() { 47 if (ebp == null) { 48 return null; 49 } 50 51 Address nextEBP = ebp.getAddressAt( 0 * ADDRESS_SIZE); 52 if (nextEBP == null) { 53 return null; 54 } 55 Address nextPC = ebp.getAddressAt( 1 * ADDRESS_SIZE); 56 if (nextPC == null) { 57 return null; 58 } 59 return new X86CFrame(dbg(), nextEBP, nextPC); 60 } 61 62 public Address pc() { 63 return pc; 64 } 65 66 public Address localVariableBase() { 67 return ebp; 68 } 69 }