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1 /* |
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2 * Copyright 2002-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 * |
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23 */ |
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24 // |
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25 // An object for encapsulating the machine/os dependent part of a JavaThread frame state |
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26 // |
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27 class JavaThread; |
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28 |
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29 class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC { |
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30 // Too many friends... |
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31 friend class CallNativeDirectNode; |
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32 friend class OptoRuntime; |
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33 friend class Runtime1; |
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34 friend class StubAssembler; |
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35 friend class CallRuntimeDirectNode; |
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36 friend class MacroAssembler; |
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37 friend class InterpreterGenerator; |
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38 friend class LIR_Assembler; |
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39 friend class GraphKit; |
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40 friend class StubGenerator; |
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41 friend class JavaThread; |
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42 friend class frame; |
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43 friend class VMStructs; |
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44 friend class BytecodeInterpreter; |
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45 friend class JavaCallWrapper; |
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46 |
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47 private: |
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48 // |
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49 // Whenever _last_Java_sp != NULL other anchor fields MUST be valid! |
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50 // The stack may not be walkable [check with walkable() ] but the values must be valid. |
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51 // The profiler apparently depends on this. |
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52 // |
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53 intptr_t* volatile _last_Java_sp; |
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54 |
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55 // Whenever we call from Java to native we can not be assured that the return |
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56 // address that composes the last_Java_frame will be in an accessible location |
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57 // so calls from Java to native store that pc (or one good enough to locate |
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58 // the oopmap) in the frame anchor. Since the frames that call from Java to |
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59 // native are never deoptimized we never need to patch the pc and so this |
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60 // is acceptable. |
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61 volatile address _last_Java_pc; |
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62 |
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63 // tells whether the last Java frame is set |
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64 // It is important that when last_Java_sp != NULL that the rest of the frame |
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65 // anchor (including platform specific) all be valid. |
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66 |
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67 bool has_last_Java_frame() const { return _last_Java_sp != NULL; } |
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68 // This is very dangerous unless sp == NULL |
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69 // Invalidate the anchor so that has_last_frame is false |
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70 // and no one should look at the other fields. |
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71 void zap(void) { _last_Java_sp = NULL; } |
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72 |
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73 #include "incls/_javaFrameAnchor_pd.hpp.incl" |
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74 |
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75 public: |
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76 JavaFrameAnchor() { clear(); } |
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77 JavaFrameAnchor(JavaFrameAnchor *src) { copy(src); } |
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78 |
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79 address last_Java_pc(void) { return _last_Java_pc; } |
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80 void set_last_Java_pc(address pc) { _last_Java_pc = pc; } |
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81 |
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82 // Assembly stub generation helpers |
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83 |
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84 static ByteSize last_Java_sp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); } |
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85 static ByteSize last_Java_pc_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); } |
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86 |
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87 }; |