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annotate src/share/vm/code/pcDesc.hpp @ 4138:82af018d61db

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Merge fixes.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 22:03:44 +0100
parents 04b9a2566eec
children 51111665eda6
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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 enum {
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43 PCDESC_reexecute = 1 << 0,
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44 PCDESC_is_method_handle_invoke = 1 << 1,
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45 PCDESC_return_oop = 1 << 2,
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46 PCDESC_rethrow_exception = 1 << 3
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47 };
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48
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49 int _flags;
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50
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51 void set_flag(int mask, bool z) {
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52 _flags = z ? (_flags | mask) : (_flags & ~mask);
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53 }
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54
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55 public:
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56 int pc_offset() const { return _pc_offset; }
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57 int scope_decode_offset() const { return _scope_decode_offset; }
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58 int obj_decode_offset() const { return _obj_decode_offset; }
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59
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60 void set_pc_offset(int x) { _pc_offset = x; }
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61 void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
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62 void set_obj_decode_offset(int x) { _obj_decode_offset = x; }
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63
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64 // Constructor (only used for static in nmethod.cpp)
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65 // Also used by ScopeDesc::sender()]
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66 PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
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67
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68 enum {
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69 // upper and lower exclusive limits real offsets:
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70 lower_offset_limit = -1,
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71 upper_offset_limit = (unsigned int)-1 >> 1
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72 };
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73
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74 // Flags
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75 bool rethrow_exception() const { return (_flags & PCDESC_rethrow_exception) != 0; }
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76 void set_rethrow_exception(bool z) { set_flag(PCDESC_rethrow_exception, z); }
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77 bool should_reexecute() const { return (_flags & PCDESC_reexecute) != 0; }
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78 void set_should_reexecute(bool z) { set_flag(PCDESC_reexecute, z); }
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79
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80 // Does pd refer to the same information as pd?
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81 bool is_same_info(const PcDesc* pd) {
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82 return _scope_decode_offset == pd->_scope_decode_offset &&
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83 _obj_decode_offset == pd->_obj_decode_offset &&
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84 _flags == pd->_flags;
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85 }
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86
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87 bool is_method_handle_invoke() const { return (_flags & PCDESC_is_method_handle_invoke) != 0; }
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88 void set_is_method_handle_invoke(bool z) { set_flag(PCDESC_is_method_handle_invoke, z); }
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90 bool return_oop() const { return (_flags & PCDESC_return_oop) != 0; }
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91 void set_return_oop(bool z) { set_flag(PCDESC_return_oop, z); }
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92
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93 // Returns the real pc
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94 address real_pc(const nmethod* code) const;
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95
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96 void print(nmethod* code);
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97 bool verify(nmethod* code);
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98 };
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99
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100 #endif // SHARE_VM_CODE_PCDESC_HPP