1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 package sun.jvm.hotspot.debugger.cdbg.basic.x86; |
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26 |
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27 import sun.jvm.hotspot.debugger.*; |
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28 import sun.jvm.hotspot.debugger.x86.*; |
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29 import sun.jvm.hotspot.debugger.cdbg.*; |
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30 import sun.jvm.hotspot.debugger.cdbg.basic.*; |
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31 |
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32 /** Basic X86 frame functionality providing sender() functionality. */ |
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33 |
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34 public class X86CFrame extends BasicCFrame { |
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35 private Address ebp; |
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36 private Address pc; |
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37 |
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38 private static final int ADDRESS_SIZE = 4; |
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39 |
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40 /** Constructor for topmost frame */ |
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41 public X86CFrame(CDebugger dbg, Address ebp, Address pc) { |
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42 super(dbg); |
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43 this.ebp = ebp; |
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44 this.pc = pc; |
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45 } |
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46 |
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47 public CFrame sender(ThreadProxy thread) { |
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48 X86ThreadContext context = (X86ThreadContext) thread.getContext(); |
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49 Address esp = context.getRegisterAsAddress(X86ThreadContext.ESP); |
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50 |
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51 if ( (ebp == null) || ebp.lessThan(esp) ) { |
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52 return null; |
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53 } |
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54 |
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55 Address nextEBP = ebp.getAddressAt( 0 * ADDRESS_SIZE); |
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56 if (nextEBP == null) { |
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57 return null; |
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58 } |
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59 Address nextPC = ebp.getAddressAt( 1 * ADDRESS_SIZE); |
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60 if (nextPC == null) { |
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61 return null; |
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62 } |
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63 return new X86CFrame(dbg(), nextEBP, nextPC); |
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64 } |
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65 |
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66 public Address pc() { |
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67 return pc; |
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68 } |
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69 |
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70 public Address localVariableBase() { |
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71 return ebp; |
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72 } |
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73 } |
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