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1 /*
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2 * Copyright 1997-2007 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 // OBJECT hierarchy
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26 // This hierarchy is a representation hierarchy, i.e. if A is a superclass
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27 // of B, A's representation is a prefix of B's representation.
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28
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29 #ifndef CHECK_UNHANDLED_OOPS
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30
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31 typedef class oopDesc* oop;
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32 typedef class instanceOopDesc* instanceOop;
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33 typedef class methodOopDesc* methodOop;
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34 typedef class constMethodOopDesc* constMethodOop;
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35 typedef class methodDataOopDesc* methodDataOop;
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36 typedef class arrayOopDesc* arrayOop;
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37 typedef class constantPoolOopDesc* constantPoolOop;
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38 typedef class constantPoolCacheOopDesc* constantPoolCacheOop;
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39 typedef class objArrayOopDesc* objArrayOop;
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40 typedef class typeArrayOopDesc* typeArrayOop;
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41 typedef class symbolOopDesc* symbolOop;
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42 typedef class klassOopDesc* klassOop;
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43 typedef class markOopDesc* markOop;
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44 typedef class compiledICHolderOopDesc* compiledICHolderOop;
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45
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46 #else
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47
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48
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49 // When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a
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50 // carefully chosen set of constructors and conversion operators to go
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51 // to and from the underlying oopDesc pointer type.
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52 //
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53 // Because oop and its subclasses <type>Oop are class types, arbitrary
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54 // conversions are not accepted by the compiler, and you may get a message
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55 // about overloading ambiguity (between long and int is common when converting
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56 // from a constant in 64 bit mode), or unable to convert from type to 'oop'.
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57 // Applying a cast to one of these conversion operators first will get to the
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58 // underlying oopDesc* type if appropriate.
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59 // Converting NULL to oop to Handle implicit is no longer accepted by the
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60 // compiler because there are too many steps in the conversion. Use Handle()
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61 // instead, which generates less code anyway.
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62
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63 class Thread;
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64 typedef class markOopDesc* markOop;
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65 class PromotedObject;
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66
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67
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68 class oop {
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69 oopDesc* _o;
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70
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71 void register_oop();
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72 void unregister_oop();
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73
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74 // friend class markOop;
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75 public:
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76 void set_obj(const void* p) {
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77 raw_set_obj(p);
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78 if (CheckUnhandledOops) register_oop();
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79 }
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80 void raw_set_obj(const void* p) { _o = (oopDesc*)p; }
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81
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82 oop() { set_obj(NULL); }
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83 oop(const volatile oop& o) { set_obj(o.obj()); }
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84 oop(const void* p) { set_obj(p); }
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85 oop(intptr_t i) { set_obj((void *)i); }
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86 #ifdef _LP64
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87 oop(int i) { set_obj((void *)i); }
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88 #endif
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89 ~oop() {
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90 if (CheckUnhandledOops) unregister_oop();
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91 }
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92
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93 oopDesc* obj() const volatile { return _o; }
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94
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95 // General access
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96 oopDesc* operator->() const { return obj(); }
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97 bool operator==(const oop o) const { return obj() == o.obj(); }
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98 bool operator==(void *p) const { return obj() == p; }
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99 bool operator!=(const oop o) const { return obj() != o.obj(); }
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100 bool operator!=(void *p) const { return obj() != p; }
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101 bool operator==(intptr_t p) const { return obj() == (oopDesc*)p; }
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102 bool operator!=(intptr_t p) const { return obj() != (oopDesc*)p; }
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103
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104 bool operator<(oop o) const { return obj() < o.obj(); }
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105 bool operator>(oop o) const { return obj() > o.obj(); }
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106 bool operator<=(oop o) const { return obj() <= o.obj(); }
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107 bool operator>=(oop o) const { return obj() >= o.obj(); }
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108 bool operator!() const { return !obj(); }
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109
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110 // Cast
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111 operator void* () const { return (void *)obj(); }
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112 operator HeapWord* () const { return (HeapWord*)obj(); }
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113 operator oopDesc* () const { return obj(); }
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114 operator intptr_t* () const { return (intptr_t*)obj(); }
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115 operator PromotedObject* () const { return (PromotedObject*)obj(); }
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116 operator markOop () const { return markOop(obj()); }
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117
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118 operator address () const { return (address)obj(); }
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119 operator intptr_t () const { return (intptr_t)obj(); }
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120
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121 // from javaCalls.cpp
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122 operator jobject () const { return (jobject)obj(); }
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123 // from javaClasses.cpp
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124 operator JavaThread* () const { return (JavaThread*)obj(); }
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125 // from jvm.cpp
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126 operator jlong* () const { return (jlong*)obj(); }
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127
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128 // from parNewGeneration and other things that want to get to the end of
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129 // an oop for stuff (like constMethodKlass.cpp, objArrayKlass.cpp)
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130 operator oop* () const { return (oop *)obj(); }
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131 };
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132
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133 #define DEF_OOP(type) \
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134 class type##OopDesc; \
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135 class type##Oop : public oop { \
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136 public: \
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137 type##Oop() : oop() {} \
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138 type##Oop(const volatile oop& o) : oop(o) {} \
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139 type##Oop(const void* p) : oop(p) {} \
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140 operator type##OopDesc* () const { return (type##OopDesc*)obj(); } \
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141 type##OopDesc* operator->() const { \
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142 return (type##OopDesc*)obj(); \
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143 } \
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144 }; \
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145
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146 DEF_OOP(instance);
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147 DEF_OOP(method);
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148 DEF_OOP(methodData);
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149 DEF_OOP(array);
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150 DEF_OOP(constMethod);
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151 DEF_OOP(constantPool);
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152 DEF_OOP(constantPoolCache);
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153 DEF_OOP(objArray);
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154 DEF_OOP(typeArray);
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155 DEF_OOP(symbol);
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156 DEF_OOP(klass);
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157 DEF_OOP(compiledICHolder);
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158
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159 #endif // CHECK_UNHANDLED_OOPS
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160
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161 // The klass hierarchy is separate from the oop hierarchy.
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162
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163 class Klass;
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164 class instanceKlass;
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165 class instanceRefKlass;
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166 class methodKlass;
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167 class constMethodKlass;
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168 class methodDataKlass;
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169 class klassKlass;
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170 class instanceKlassKlass;
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171 class arrayKlassKlass;
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172 class objArrayKlassKlass;
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173 class typeArrayKlassKlass;
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174 class arrayKlass;
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175 class constantPoolKlass;
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176 class constantPoolCacheKlass;
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177 class objArrayKlass;
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178 class typeArrayKlass;
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179 class symbolKlass;
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180 class compiledICHolderKlass;
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