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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 };
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