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annotate src/share/vm/code/pcDesc.hpp @ 1014:8e954aedbb81

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6889869: assert(!Interpreter::bytecode_should_reexecute(code),"should not reexecute") Reviewed-by: jrose, kvn, cfang, twisti
author never
date Wed, 14 Oct 2009 10:36:57 -0700
parents 72088be4b386
children e66fd840cb6b
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1 /*
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2 * Copyright 1997-2009 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 // PcDescs map a physical PC (given as offset from start of nmethod) to
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26 // the corresponding source scope and byte code index.
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27
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28 class nmethod;
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29
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30 class PcDesc VALUE_OBJ_CLASS_SPEC {
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31 friend class VMStructs;
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32 private:
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33 int _pc_offset; // offset from start of nmethod
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34 int _scope_decode_offset; // offset for scope in nmethod
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35 int _obj_decode_offset;
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36
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37 union PcDescFlags {
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38 int word;
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39 struct {
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40 unsigned int reexecute: 1;
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41 } bits;
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42 bool operator ==(const PcDescFlags& other) { return word == other.word; }
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43 } _flags;
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44
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45 public:
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46 int pc_offset() const { return _pc_offset; }
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47 int scope_decode_offset() const { return _scope_decode_offset; }
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48 int obj_decode_offset() const { return _obj_decode_offset; }
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49
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50 void set_pc_offset(int x) { _pc_offset = x; }
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51 void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
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52 void set_obj_decode_offset(int x) { _obj_decode_offset = x; }
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53
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54 // Constructor (only used for static in nmethod.cpp)
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55 // Also used by ScopeDesc::sender()]
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56 PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
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57
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58 enum {
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59 // upper and lower exclusive limits real offsets:
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60 lower_offset_limit = -1,
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61 upper_offset_limit = (unsigned int)-1 >> 1
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62 };
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63
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64 // Flags
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65 bool should_reexecute() const { return _flags.bits.reexecute; }
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66 void set_should_reexecute(bool z) { _flags.bits.reexecute = z; }
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67
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68 // Does pd refer to the same information as pd?
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69 bool is_same_info(const PcDesc* pd) {
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70 return _scope_decode_offset == pd->_scope_decode_offset &&
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71 _obj_decode_offset == pd->_obj_decode_offset &&
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72 _flags == pd->_flags;
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73 }
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74
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75 // Returns the real pc
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76 address real_pc(const nmethod* code) const;
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77
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78 void print(nmethod* code);
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79 bool verify(nmethod* code);
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80 };