annotate src/share/vm/code/pcDesc.hpp @ 3018:5857923e563c

Fixed an issue with frame states in exception dispatch chains (now we are correctly rethrowing the exception immediately at entering the interpreter).
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Sat, 18 Jun 2011 19:13:55 +0200
parents f95d63e2154a
children 04b9a2566eec
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1 /*
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2 * Copyright (c) 1997, 2010, 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 #ifndef SHARE_VM_CODE_PCDESC_HPP
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26 #define SHARE_VM_CODE_PCDESC_HPP
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27
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28 #include "memory/allocation.hpp"
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29
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30 // PcDescs map a physical PC (given as offset from start of nmethod) to
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31 // the corresponding source scope and byte code index.
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32
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33 class nmethod;
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34
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35 class PcDesc VALUE_OBJ_CLASS_SPEC {
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36 friend class VMStructs;
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37 private:
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38 int _pc_offset; // offset from start of nmethod
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39 int _scope_decode_offset; // offset for scope in nmethod
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40 int _obj_decode_offset;
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41
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42 union PcDescFlags {
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43 int word;
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44 struct {
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45 unsigned int reexecute: 1;
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46 unsigned int rethrow_exception: 1;
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47 unsigned int is_method_handle_invoke: 1;
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48 unsigned int return_oop: 1;
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49 } bits;
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50 bool operator ==(const PcDescFlags& other) { return word == other.word; }
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51 } _flags;
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52
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53 public:
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54 int pc_offset() const { return _pc_offset; }
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55 int scope_decode_offset() const { return _scope_decode_offset; }
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56 int obj_decode_offset() const { return _obj_decode_offset; }
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57
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58 void set_pc_offset(int x) { _pc_offset = x; }
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59 void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
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60 void set_obj_decode_offset(int x) { _obj_decode_offset = x; }
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61
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62 // Constructor (only used for static in nmethod.cpp)
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63 // Also used by ScopeDesc::sender()]
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64 PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
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65
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66 enum {
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67 // upper and lower exclusive limits real offsets:
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68 lower_offset_limit = -1,
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69 upper_offset_limit = (unsigned int)-1 >> 1
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70 };
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71
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72 // Flags
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73 bool should_reexecute() const { return _flags.bits.reexecute; }
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74 void set_should_reexecute(bool z) { _flags.bits.reexecute = z; }
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75 bool rethrow_exception() const { return _flags.bits.rethrow_exception; }
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76 void set_rethrow_exception(bool z) { _flags.bits.rethrow_exception = z; }
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77
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78 // Does pd refer to the same information as pd?
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79 bool is_same_info(const PcDesc* pd) {
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80 return _scope_decode_offset == pd->_scope_decode_offset &&
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81 _obj_decode_offset == pd->_obj_decode_offset &&
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82 _flags == pd->_flags;
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83 }
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84
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85 bool is_method_handle_invoke() const { return _flags.bits.is_method_handle_invoke; }
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86 void set_is_method_handle_invoke(bool z) { _flags.bits.is_method_handle_invoke = z; }
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87
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88 bool return_oop() const { return _flags.bits.return_oop; }
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89 void set_return_oop(bool z) { _flags.bits.return_oop = z; }
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90
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91 // Returns the real pc
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92 address real_pc(const nmethod* code) const;
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93
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94 void print(nmethod* code);
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95 bool verify(nmethod* code);
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96 };
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97
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98 #endif // SHARE_VM_CODE_PCDESC_HPP