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1 /*
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2 * Copyright 1997-2006 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 // A klassVtable abstracts the variable-length vtable that is embedded in instanceKlass
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26 // and arrayKlass. klassVtable objects are used just as convenient transient accessors to the vtable,
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27 // not to actually hold the vtable data.
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28 // Note: the klassVtable should not be accessed before the class has been verified
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29 // (until that point, the vtable is uninitialized).
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30
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31 // Currently a klassVtable contains a direct reference to the vtable data, and is therefore
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32 // not preserved across GCs.
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33
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34 class vtableEntry;
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35
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36 class klassVtable : public ResourceObj {
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37 KlassHandle _klass; // my klass
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38 int _tableOffset; // offset of start of vtable data within klass
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39 int _length; // length of vtable (number of entries)
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40 #ifndef PRODUCT
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41 int _verify_count; // to make verify faster
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42 #endif
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43
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44 // Ordering important, so greater_than (>) can be used as an merge operator.
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45 enum AccessType {
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46 acc_private = 0,
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47 acc_package_private = 1,
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48 acc_publicprotected = 2
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49 };
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50
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51 public:
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52 klassVtable(KlassHandle h_klass, void* base, int length) : _klass(h_klass) {
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53 _tableOffset = (address)base - (address)h_klass(); _length = length;
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54 }
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55
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56 // accessors
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57 vtableEntry* table() const { return (vtableEntry*)(address(_klass()) + _tableOffset); }
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58 KlassHandle klass() const { return _klass; }
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59 int length() const { return _length; }
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60 inline methodOop method_at(int i) const;
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61 inline methodOop unchecked_method_at(int i) const;
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62 inline oop* adr_method_at(int i) const;
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63
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64 // searching; all methods return -1 if not found
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65 int index_of(methodOop m) const { return index_of(m, _length); }
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66 int index_of_miranda(symbolOop name, symbolOop signature);
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67
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68 void initialize_vtable(bool checkconstraints, TRAPS); // initialize vtable of a new klass
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69
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70 // conputes vtable length (in words) and the number of miranda methods
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71 static void compute_vtable_size_and_num_mirandas(int &vtable_length, int &num_miranda_methods,
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72 klassOop super, objArrayOop methods,
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73 AccessFlags class_flags, oop classloader,
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74 symbolOop classname, objArrayOop local_interfaces);
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75
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76 // RedefineClasses() API support:
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77 // If any entry of this vtable points to any of old_methods,
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78 // replace it with the corresponding new_method.
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79 // trace_name_printed is set to true if the current call has
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80 // printed the klass name so that other routines in the adjust_*
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81 // group don't print the klass name.
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82 void adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
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83 int methods_length, bool * trace_name_printed);
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84
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85 // Garbage collection
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86 void oop_follow_contents();
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87 void oop_adjust_pointers();
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88
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89 #ifndef SERIALGC
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90 // Parallel Old
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91 void oop_follow_contents(ParCompactionManager* cm);
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92 void oop_update_pointers(ParCompactionManager* cm);
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93 void oop_update_pointers(ParCompactionManager* cm,
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94 HeapWord* beg_addr, HeapWord* end_addr);
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95 #endif // SERIALGC
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96
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97 // Iterators
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98 void oop_oop_iterate(OopClosure* blk);
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99 void oop_oop_iterate_m(OopClosure* blk, MemRegion mr);
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100
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101 // Debugging code
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102 void print() PRODUCT_RETURN;
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103 void verify(outputStream* st, bool force = false);
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104 static void print_statistics() PRODUCT_RETURN;
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105
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106 #ifndef PRODUCT
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107 bool check_no_old_entries();
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108 void dump_vtable();
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109 #endif
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110
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111 protected:
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112 friend class vtableEntry;
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113 private:
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114 void copy_vtable_to(vtableEntry* start);
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115 int initialize_from_super(KlassHandle super);
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116 int index_of(methodOop m, int len) const; // same as index_of, but search only up to len
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117 void put_method_at(methodOop m, int index);
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118 static bool needs_new_vtable_entry(methodOop m, klassOop super, oop classloader, symbolOop classname, AccessFlags access_flags);
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119 AccessType vtable_accessibility_at(int i);
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120
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121 bool update_super_vtable(instanceKlass* klass, methodHandle target_method, int super_vtable_len, bool checkconstraints, TRAPS);
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122
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123 // support for miranda methods
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124 bool is_miranda_entry_at(int i);
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125 void fill_in_mirandas(int& initialized);
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126 static bool is_miranda(methodOop m, objArrayOop class_methods, klassOop super);
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127 static void add_new_mirandas_to_list(GrowableArray<methodOop>* list_of_current_mirandas, objArrayOop current_interface_methods, objArrayOop class_methods, klassOop super);
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128 static void get_mirandas(GrowableArray<methodOop>* mirandas, klassOop super, objArrayOop class_methods, objArrayOop local_interfaces);
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129 static int get_num_mirandas(klassOop super, objArrayOop class_methods, objArrayOop local_interfaces);
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130
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131
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132 void verify_against(outputStream* st, klassVtable* vt, int index);
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133 inline instanceKlass* ik() const;
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134 };
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135
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136
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137 // private helper class for klassVtable
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138 // description of entry points:
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139 // destination is interpreted:
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140 // from_compiled_code_entry_point -> c2iadapter
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141 // from_interpreter_entry_point -> interpreter entry point
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142 // destination is compiled:
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143 // from_compiled_code_entry_point -> nmethod entry point
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144 // from_interpreter_entry_point -> i2cadapter
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145 class vtableEntry VALUE_OBJ_CLASS_SPEC {
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146 public:
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147 // size in words
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148 static int size() {
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149 return sizeof(vtableEntry) / sizeof(HeapWord);
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150 }
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151 static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); }
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152 methodOop method() const { return _method; }
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153
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154 private:
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155 methodOop _method;
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156 void set(methodOop method) { assert(method != NULL, "use clear"); _method = method; }
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157 void clear() { _method = NULL; }
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158 void print() PRODUCT_RETURN;
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159 void verify(klassVtable* vt, outputStream* st);
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160
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161 friend class klassVtable;
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162 };
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163
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164
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165 inline methodOop klassVtable::method_at(int i) const {
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166 assert(i >= 0 && i < _length, "index out of bounds");
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167 assert(table()[i].method() != NULL, "should not be null");
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168 assert(oop(table()[i].method())->is_method(), "should be method");
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169 return table()[i].method();
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170 }
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171
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172 inline methodOop klassVtable::unchecked_method_at(int i) const {
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173 assert(i >= 0 && i < _length, "index out of bounds");
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174 return table()[i].method();
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175 }
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176
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177 inline oop* klassVtable::adr_method_at(int i) const {
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178 // Allow one past the last entry to be referenced; useful for loop bounds.
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179 assert(i >= 0 && i <= _length, "index out of bounds");
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180 return (oop*)(address(table() + i) + vtableEntry::method_offset_in_bytes());
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181 }
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182
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183 // --------------------------------------------------------------------------------
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184 class klassItable;
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185 class itableMethodEntry;
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186
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187 class itableOffsetEntry VALUE_OBJ_CLASS_SPEC {
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188 private:
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189 klassOop _interface;
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190 int _offset;
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191 public:
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192 klassOop interface_klass() const { return _interface; }
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193 int offset() const { return _offset; }
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194
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195 static itableMethodEntry* method_entry(klassOop k, int offset) { return (itableMethodEntry*)(((address)k) + offset); }
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196 itableMethodEntry* first_method_entry(klassOop k) { return method_entry(k, _offset); }
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197
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198 void initialize(klassOop interf, int offset) { _interface = interf; _offset = offset; }
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199
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200 // Static size and offset accessors
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201 static int size() { return sizeof(itableOffsetEntry) / HeapWordSize; } // size in words
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202 static int interface_offset_in_bytes() { return offset_of(itableOffsetEntry, _interface); }
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203 static int offset_offset_in_bytes() { return offset_of(itableOffsetEntry, _offset); }
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204
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205 friend class klassItable;
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206 };
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207
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208
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209 class itableMethodEntry VALUE_OBJ_CLASS_SPEC {
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210 private:
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211 methodOop _method;
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212
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213 public:
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214 methodOop method() const { return _method; }
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215
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216 void clear() { _method = NULL; }
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217
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218 void initialize(methodOop method);
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219
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220 // Static size and offset accessors
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221 static int size() { return sizeof(itableMethodEntry) / HeapWordSize; } // size in words
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222 static int method_offset_in_bytes() { return offset_of(itableMethodEntry, _method); }
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223
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224 friend class klassItable;
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225 };
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226
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227 //
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228 // Format of an itable
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229 //
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230 // ---- offset table ---
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231 // klassOop of interface 1 \
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232 // offset to vtable from start of oop / offset table entry
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233 // ...
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234 // klassOop of interface n \
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235 // offset to vtable from start of oop / offset table entry
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236 // --- vtable for interface 1 ---
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237 // methodOop \
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238 // compiler entry point / method table entry
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239 // ...
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240 // methodOop \
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241 // compiler entry point / method table entry
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242 // -- vtable for interface 2 ---
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243 // ...
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244 //
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245 class klassItable : public ResourceObj {
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246 private:
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247 instanceKlassHandle _klass; // my klass
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248 int _table_offset; // offset of start of itable data within klass (in words)
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249 int _size_offset_table; // size of offset table (in itableOffset entries)
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250 int _size_method_table; // size of methodtable (in itableMethodEntry entries)
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251
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252 void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS);
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253 public:
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254 klassItable(instanceKlassHandle klass);
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255
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256 itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds");
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257 return &((itableOffsetEntry*)vtable_start())[i]; }
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258
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259 itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds");
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260 return &((itableMethodEntry*)method_start())[i]; }
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261
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262 int nof_interfaces() { return _size_offset_table; }
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263
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264 // Initialization
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265 void initialize_itable(bool checkconstraints, TRAPS);
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266
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267 // Updates
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268 void initialize_with_method(methodOop m);
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269
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270 // RedefineClasses() API support:
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271 // if any entry of this itable points to any of old_methods,
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272 // replace it with the corresponding new_method.
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273 // trace_name_printed is set to true if the current call has
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274 // printed the klass name so that other routines in the adjust_*
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275 // group don't print the klass name.
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276 void adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
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277 int methods_length, bool * trace_name_printed);
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278
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279 // Garbage collection
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280 void oop_follow_contents();
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281 void oop_adjust_pointers();
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282
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283 #ifndef SERIALGC
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284 // Parallel Old
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285 void oop_follow_contents(ParCompactionManager* cm);
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286 void oop_update_pointers(ParCompactionManager* cm);
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287 void oop_update_pointers(ParCompactionManager* cm,
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288 HeapWord* beg_addr, HeapWord* end_addr);
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289 #endif // SERIALGC
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290
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291 // Iterators
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292 void oop_oop_iterate(OopClosure* blk);
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293 void oop_oop_iterate_m(OopClosure* blk, MemRegion mr);
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294
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295 // Setup of itable
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296 static int compute_itable_size(objArrayHandle transitive_interfaces);
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297 static void setup_itable_offset_table(instanceKlassHandle klass);
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298
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299 // Resolving of method to index
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300 static int compute_itable_index(methodOop m);
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301
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302 // Debugging/Statistics
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303 static void print_statistics() PRODUCT_RETURN;
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304 private:
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305 intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; }
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306 intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); }
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307
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308 // Helper methods
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309 static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); }
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310
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311 // Statistics
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312 NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables
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313 NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables
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314
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315 static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; })
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316 };
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