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1 /*
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2 * Copyright 2002-2007 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 class JavaThread;
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26
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27 //
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28 // RegisterMap
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29 //
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30 // A companion structure used for stack traversal. The RegisterMap contains
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31 // misc. information needed in order to do correct stack traversal of stack
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32 // frames. Hence, it must always be passed in as an argument to
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33 // frame::sender(RegisterMap*).
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34 //
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35 // In particular,
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36 // 1) It provides access to the thread for which the stack belongs. The
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37 // thread object is needed in order to get sender of a deoptimized frame.
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38 //
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39 // 2) It is used to pass information from a callee frame to its caller
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40 // frame about how the frame should be traversed. This is used to let
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41 // the caller frame take care of calling oops-do of out-going
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42 // arguments, when the callee frame is not instantiated yet. This
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43 // happens, e.g., when a compiled frame calls into
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44 // resolve_virtual_call. (Hence, it is critical that the same
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45 // RegisterMap object is used for the entire stack walk. Normally,
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46 // this is hidden by using the StackFrameStream.) This is used when
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47 // doing follow_oops and oops_do.
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48 //
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49 // 3) The RegisterMap keeps track of the values of callee-saved registers
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50 // from frame to frame (hence, the name). For some stack traversal the
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51 // values of the callee-saved registers does not matter, e.g., if you
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52 // only need the static properies such as frame type, pc, and such.
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53 // Updating of the RegisterMap can be turned off by instantiating the
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54 // register map as: RegisterMap map(thread, false);
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55
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56 class RegisterMap : public StackObj {
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57 public:
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58 typedef julong LocationValidType;
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59 enum {
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60 reg_count = ConcreteRegisterImpl::number_of_registers,
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61 location_valid_type_size = sizeof(LocationValidType)*8,
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62 location_valid_size = (reg_count+location_valid_type_size-1)/location_valid_type_size
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63 };
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64 private:
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65 intptr_t* _location[reg_count]; // Location of registers (intptr_t* looks better than address in the debugger)
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66 LocationValidType _location_valid[location_valid_size];
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67 bool _include_argument_oops; // Should include argument_oop marked locations for compiler
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68 JavaThread* _thread; // Reference to current thread
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69 bool _update_map; // Tells if the register map need to be
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70 // updated when traversing the stack
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71
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72 #ifdef ASSERT
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73 void check_location_valid();
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74 #else
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75 void check_location_valid() {}
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76 #endif
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77
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78 public:
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79 debug_only(intptr_t* _update_for_id;) // Assert that RegisterMap is not updated twice for same frame
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80 RegisterMap(JavaThread *thread, bool update_map = true);
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81 RegisterMap(const RegisterMap* map);
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82
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83 address location(VMReg reg) const {
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84 int index = reg->value() / location_valid_type_size;
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85 assert(0 <= reg->value() && reg->value() < reg_count, "range check");
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86 assert(0 <= index && index < location_valid_size, "range check");
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87 if (_location_valid[index] & ((LocationValidType)1 << (reg->value() % location_valid_type_size))) {
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88 return (address) _location[reg->value()];
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89 } else {
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90 return pd_location(reg);
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91 }
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92 }
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93
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94 void set_location(VMReg reg, address loc) {
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95 int index = reg->value() / location_valid_type_size;
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96 assert(0 <= reg->value() && reg->value() < reg_count, "range check");
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97 assert(0 <= index && index < location_valid_size, "range check");
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98 assert(_update_map, "updating map that does not need updating");
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99 _location[reg->value()] = (intptr_t*) loc;
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100 _location_valid[index] |= ((LocationValidType)1 << (reg->value() % location_valid_type_size));
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101 check_location_valid();
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102 }
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103
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104 // Called by an entry frame.
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105 void clear();
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106
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107 bool include_argument_oops() const { return _include_argument_oops; }
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108 void set_include_argument_oops(bool f) { _include_argument_oops = f; }
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109
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110 JavaThread *thread() const { return _thread; }
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111 bool update_map() const { return _update_map; }
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112
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113 void print_on(outputStream* st) const;
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114 void print() const;
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115
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116 // the following contains the definition of pd_xxx methods
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117 # include "incls/_registerMap_pd.hpp.incl"
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118 };
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