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1 /*
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2 * Copyright 1999-2006 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 // ciObject
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26 //
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27 // This class represents an oop in the HotSpot virtual machine.
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28 // Its subclasses are structured in a hierarchy which mirrors
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29 // an aggregate of the VM's oop and klass hierarchies (see
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30 // oopHierarchy.hpp). Each instance of ciObject holds a handle
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31 // to a corresponding oop on the VM side and provides routines
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32 // for accessing the information in its oop. By using the ciObject
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33 // hierarchy for accessing oops in the VM, the compiler ensures
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34 // that it is safe with respect to garbage collection; that is,
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35 // GC and compilation can proceed independently without
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36 // interference.
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37 //
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38 // Within the VM, the oop and klass hierarchies are separate.
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39 // The compiler interface does not preserve this separation --
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40 // the distinction between `klassOop' and `Klass' are not
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41 // reflected in the interface and instead the Klass hierarchy
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42 // is directly modeled as the subclasses of ciKlass.
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43 class ciObject : public ResourceObj {
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44 CI_PACKAGE_ACCESS
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45 friend class ciEnv;
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46
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47 private:
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48 // A JNI handle referring to an oop in the VM. This
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49 // handle may, in a small set of cases, correctly be NULL.
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50 jobject _handle;
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51 ciKlass* _klass;
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52 uint _ident;
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53
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989
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54 enum { FLAG_BITS = 2 };
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0
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55 enum {
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989
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56 PERM_FLAG = 1,
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57 SCAVENGABLE_FLAG = 2
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0
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58 };
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59 protected:
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60 ciObject();
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61 ciObject(oop o);
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62 ciObject(Handle h);
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63 ciObject(ciKlass* klass);
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64
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65 jobject handle() const { return _handle; }
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66 // Get the VM oop that this object holds.
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67 oop get_oop() const {
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68 assert(_handle != NULL, "null oop");
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69 return JNIHandles::resolve_non_null(_handle);
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70 }
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71
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989
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72 void init_flags_from(oop x) {
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73 int flags = 0;
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74 if (x != NULL) {
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75 if (x->is_perm())
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76 flags |= PERM_FLAG;
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77 if (x->is_scavengable())
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78 flags |= SCAVENGABLE_FLAG;
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79 }
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80 _ident |= flags;
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0
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81 }
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82
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83 // Virtual behavior of the print() method.
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84 virtual void print_impl(outputStream* st) {}
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85
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86 virtual const char* type_string() { return "ciObject"; }
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87
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88 void set_ident(uint id);
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89 public:
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90 // The klass of this ciObject.
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91 ciKlass* klass();
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92
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93 // A number unique to this object.
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94 uint ident();
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95
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96 // Are two ciObjects equal?
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97 bool equals(ciObject* obj);
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98
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99 // A hash value for the convenience of compilers.
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100 int hash();
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101
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989
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102 // Tells if this oop has an encoding as a constant.
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103 // True if is_scavengable is false.
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104 // Also true if ScavengeRootsInCode is non-zero.
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0
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105 // If it does not have an encoding, the compiler is responsible for
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106 // making other arrangements for dealing with the oop.
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989
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107 // See ciEnv::make_array
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108 bool can_be_constant();
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109
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110 // Tells if this oop should be made a constant.
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111 // True if is_scavengable is false or ScavengeRootsInCode > 1.
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112 bool should_be_constant();
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0
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113
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114 // Is this object guaranteed to be in the permanent part of the heap?
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115 // If so, CollectedHeap::can_elide_permanent_oop_store_barriers is relevant.
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116 // If the answer is false, no guarantees are made.
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117 bool is_perm() { return (_ident & PERM_FLAG) != 0; }
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118
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989
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119 // Might this object possibly move during a scavenge operation?
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120 // If the answer is true and ScavengeRootsInCode==0, the oop cannot be embedded in code.
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121 bool is_scavengable() { return (_ident & SCAVENGABLE_FLAG) != 0; }
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122
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0
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123 // The address which the compiler should embed into the
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124 // generated code to represent this oop. This address
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125 // is not the true address of the oop -- it will get patched
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126 // during nmethod creation.
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127 //
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128 // Usage note: no address arithmetic allowed. Oop must
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129 // be registered with the oopRecorder.
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989
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130 jobject constant_encoding();
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0
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131
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132 // What kind of ciObject is this?
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133 virtual bool is_null_object() const { return false; }
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134 virtual bool is_instance() { return false; }
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135 virtual bool is_method() { return false; }
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136 virtual bool is_method_data() { return false; }
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137 virtual bool is_array() { return false; }
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138 virtual bool is_obj_array() { return false; }
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139 virtual bool is_type_array() { return false; }
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140 virtual bool is_symbol() { return false; }
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141 virtual bool is_type() { return false; }
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142 virtual bool is_return_address() { return false; }
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143 virtual bool is_klass() { return false; }
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144 virtual bool is_instance_klass() { return false; }
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145 virtual bool is_method_klass() { return false; }
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146 virtual bool is_array_klass() { return false; }
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147 virtual bool is_obj_array_klass() { return false; }
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148 virtual bool is_type_array_klass() { return false; }
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149 virtual bool is_symbol_klass() { return false; }
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150 virtual bool is_klass_klass() { return false; }
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151 virtual bool is_instance_klass_klass() { return false; }
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152 virtual bool is_array_klass_klass() { return false; }
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153 virtual bool is_obj_array_klass_klass() { return false; }
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154 virtual bool is_type_array_klass_klass() { return false; }
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155
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156 // Is this a type or value which has no associated class?
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157 // It is true of primitive types and null objects.
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158 virtual bool is_classless() const { return false; }
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159
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160 // Is this ciObject a Java Language Object? That is,
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161 // is the ciObject an instance or an array
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162 virtual bool is_java_object() { return false; }
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163
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164 // Does this ciObject represent a Java Language class?
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165 // That is, is the ciObject an instanceKlass or arrayKlass?
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166 virtual bool is_java_klass() { return false; }
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167
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168 // Is this ciObject the ciInstanceKlass representing
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169 // java.lang.Object()?
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170 virtual bool is_java_lang_Object() { return false; }
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171
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172 // Does this ciObject refer to a real oop in the VM?
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173 //
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174 // Note: some ciObjects refer to oops which have yet to be
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175 // created. We refer to these as "unloaded". Specifically,
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176 // there are unloaded ciMethods, ciObjArrayKlasses, and
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177 // ciInstanceKlasses. By convention the ciNullObject is
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178 // considered loaded, and primitive types are considered loaded.
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179 bool is_loaded() const {
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180 return handle() != NULL || is_classless();
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181 }
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182
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183 // Subclass casting with assertions.
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184 ciNullObject* as_null_object() {
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185 assert(is_null_object(), "bad cast");
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186 return (ciNullObject*)this;
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187 }
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188 ciInstance* as_instance() {
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189 assert(is_instance(), "bad cast");
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190 return (ciInstance*)this;
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191 }
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192 ciMethod* as_method() {
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193 assert(is_method(), "bad cast");
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194 return (ciMethod*)this;
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195 }
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196 ciMethodData* as_method_data() {
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197 assert(is_method_data(), "bad cast");
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198 return (ciMethodData*)this;
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199 }
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200 ciArray* as_array() {
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201 assert(is_array(), "bad cast");
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202 return (ciArray*)this;
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203 }
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204 ciObjArray* as_obj_array() {
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205 assert(is_obj_array(), "bad cast");
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206 return (ciObjArray*)this;
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207 }
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208 ciTypeArray* as_type_array() {
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209 assert(is_type_array(), "bad cast");
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210 return (ciTypeArray*)this;
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211 }
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212 ciSymbol* as_symbol() {
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213 assert(is_symbol(), "bad cast");
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214 return (ciSymbol*)this;
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215 }
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216 ciType* as_type() {
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217 assert(is_type(), "bad cast");
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218 return (ciType*)this;
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219 }
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220 ciReturnAddress* as_return_address() {
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221 assert(is_return_address(), "bad cast");
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222 return (ciReturnAddress*)this;
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223 }
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224 ciKlass* as_klass() {
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225 assert(is_klass(), "bad cast");
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226 return (ciKlass*)this;
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227 }
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228 ciInstanceKlass* as_instance_klass() {
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229 assert(is_instance_klass(), "bad cast");
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230 return (ciInstanceKlass*)this;
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231 }
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232 ciMethodKlass* as_method_klass() {
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233 assert(is_method_klass(), "bad cast");
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234 return (ciMethodKlass*)this;
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235 }
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236 ciArrayKlass* as_array_klass() {
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237 assert(is_array_klass(), "bad cast");
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238 return (ciArrayKlass*)this;
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239 }
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240 ciObjArrayKlass* as_obj_array_klass() {
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241 assert(is_obj_array_klass(), "bad cast");
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242 return (ciObjArrayKlass*)this;
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243 }
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244 ciTypeArrayKlass* as_type_array_klass() {
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245 assert(is_type_array_klass(), "bad cast");
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246 return (ciTypeArrayKlass*)this;
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247 }
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248 ciSymbolKlass* as_symbol_klass() {
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249 assert(is_symbol_klass(), "bad cast");
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250 return (ciSymbolKlass*)this;
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251 }
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252 ciKlassKlass* as_klass_klass() {
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253 assert(is_klass_klass(), "bad cast");
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254 return (ciKlassKlass*)this;
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255 }
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256 ciInstanceKlassKlass* as_instance_klass_klass() {
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257 assert(is_instance_klass_klass(), "bad cast");
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258 return (ciInstanceKlassKlass*)this;
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259 }
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260 ciArrayKlassKlass* as_array_klass_klass() {
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261 assert(is_array_klass_klass(), "bad cast");
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262 return (ciArrayKlassKlass*)this;
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263 }
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264 ciObjArrayKlassKlass* as_obj_array_klass_klass() {
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265 assert(is_obj_array_klass_klass(), "bad cast");
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266 return (ciObjArrayKlassKlass*)this;
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267 }
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268 ciTypeArrayKlassKlass* as_type_array_klass_klass() {
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269 assert(is_type_array_klass_klass(), "bad cast");
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270 return (ciTypeArrayKlassKlass*)this;
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271 }
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272
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273 // Print debugging output about this ciObject.
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274 void print(outputStream* st = tty);
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275
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276 // Print debugging output about the oop this ciObject represents.
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277 void print_oop(outputStream* st = tty);
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278 };
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