0
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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 # include "incls/_precompiled.incl"
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26 # include "incls/_vmSymbols.cpp.incl"
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27
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28
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29 symbolOop vmSymbols::_symbols[vmSymbols::SID_LIMIT];
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30
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31 symbolOop vmSymbols::_type_signatures[T_VOID+1] = { NULL /*, NULL...*/ };
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32
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33 inline int compare_symbol(symbolOop a, symbolOop b) {
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34 if (a == b) return 0;
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35 // follow the natural address order:
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36 return (address)a > (address)b ? +1 : -1;
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37 }
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38
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39 static vmSymbols::SID vm_symbol_index[vmSymbols::SID_LIMIT];
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40 extern "C" {
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41 static int compare_vmsymbol_sid(const void* void_a, const void* void_b) {
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42 symbolOop a = vmSymbols::symbol_at(*((vmSymbols::SID*) void_a));
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43 symbolOop b = vmSymbols::symbol_at(*((vmSymbols::SID*) void_b));
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44 return compare_symbol(a, b);
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45 }
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46 }
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47
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48 #ifndef PRODUCT
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49 #define VM_SYMBOL_ENUM_NAME_BODY(name, string) #name "\0"
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50 static const char* vm_symbol_enum_names =
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51 VM_SYMBOLS_DO(VM_SYMBOL_ENUM_NAME_BODY, VM_ALIAS_IGNORE)
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52 "\0";
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53 static const char* vm_symbol_enum_name(vmSymbols::SID sid) {
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54 const char* string = &vm_symbol_enum_names[0];
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55 int skip = (int)sid - (int)vmSymbols::FIRST_SID;
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56 for (; skip != 0; skip--) {
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57 size_t skiplen = strlen(string);
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58 if (skiplen == 0) return "<unknown>"; // overflow
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59 string += skiplen+1;
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60 }
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61 return string;
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62 }
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63 #endif //PRODUCT
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64
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65 // Put all the VM symbol strings in one place.
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66 // Makes for a more compact libjvm.
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67 #define VM_SYMBOL_BODY(name, string) string "\0"
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68 static const char* vm_symbol_bodies = VM_SYMBOLS_DO(VM_SYMBOL_BODY, VM_ALIAS_IGNORE);
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69
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70 void vmSymbols::initialize(TRAPS) {
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71 assert((int)SID_LIMIT <= (1<<log2_SID_LIMIT), "must fit in this bitfield");
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72 assert((int)SID_LIMIT*5 > (1<<log2_SID_LIMIT), "make the bitfield smaller, please");
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73
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74 if (!UseSharedSpaces) {
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75 const char* string = &vm_symbol_bodies[0];
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76 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
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77 symbolOop sym = oopFactory::new_symbol(string, CHECK);
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78 _symbols[index] = sym;
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79 string += strlen(string); // skip string body
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80 string += 1; // skip trailing null
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81 }
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82
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83 _type_signatures[T_BYTE] = byte_signature();
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84 _type_signatures[T_CHAR] = char_signature();
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85 _type_signatures[T_DOUBLE] = double_signature();
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86 _type_signatures[T_FLOAT] = float_signature();
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87 _type_signatures[T_INT] = int_signature();
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88 _type_signatures[T_LONG] = long_signature();
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89 _type_signatures[T_SHORT] = short_signature();
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90 _type_signatures[T_BOOLEAN] = bool_signature();
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91 _type_signatures[T_VOID] = void_signature();
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92 // no single signatures for T_OBJECT or T_ARRAY
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93 }
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94
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95 #ifdef ASSERT
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96 // Check for duplicates:
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97 for (int i1 = (int)FIRST_SID; i1 < (int)SID_LIMIT; i1++) {
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98 symbolOop sym = symbol_at((SID)i1);
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99 for (int i2 = (int)FIRST_SID; i2 < i1; i2++) {
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100 if (symbol_at((SID)i2) == sym) {
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101 tty->print("*** Duplicate VM symbol SIDs %s(%d) and %s(%d): \"",
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102 vm_symbol_enum_name((SID)i2), i2,
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103 vm_symbol_enum_name((SID)i1), i1);
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104 sym->print_symbol_on(tty);
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105 tty->print_cr("\"");
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106 }
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107 }
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108 }
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109 #endif //ASSERT
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110
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111 // Create an index for find_id:
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112 {
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113 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
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114 vm_symbol_index[index] = (SID)index;
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115 }
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116 int num_sids = SID_LIMIT-FIRST_SID;
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117 qsort(&vm_symbol_index[FIRST_SID], num_sids, sizeof(vm_symbol_index[0]),
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118 compare_vmsymbol_sid);
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119 }
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120
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121 #ifdef ASSERT
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122 {
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123 // Spot-check correspondence between strings, symbols, and enums:
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124 assert(_symbols[NO_SID] == NULL, "must be");
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125 const char* str = "java/lang/Object";
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126 symbolOop sym = oopFactory::new_symbol(str, CHECK);
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127 assert(strcmp(str, (char*)sym->base()) == 0, "");
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128 assert(sym == java_lang_Object(), "");
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129 SID sid = VM_SYMBOL_ENUM_NAME(java_lang_Object);
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130 assert(find_sid(sym) == sid, "");
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131 assert(symbol_at(sid) == sym, "");
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132
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133 // Make sure find_sid produces the right answer in each case.
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134 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
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135 sym = symbol_at((SID)index);
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136 sid = find_sid(sym);
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137 assert(sid == (SID)index, "symbol index works");
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138 // Note: If there are duplicates, this assert will fail.
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139 // A "Duplicate VM symbol" message will have already been printed.
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140 }
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141
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142 // The string "format" happens (at the moment) not to be a vmSymbol,
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143 // though it is a method name in java.lang.String.
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144 str = "format";
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145 sym = oopFactory::new_symbol(str, CHECK);
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146 sid = find_sid(sym);
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147 assert(sid == NO_SID, "symbol index works (negative test)");
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148 }
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149 #endif
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150 }
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151
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152
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153 #ifndef PRODUCT
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154 const char* vmSymbols::name_for(vmSymbols::SID sid) {
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155 if (sid == NO_SID)
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156 return "NO_SID";
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157 const char* string = &vm_symbol_bodies[0];
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158 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
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159 if (index == (int)sid)
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160 return string;
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161 string += strlen(string); // skip string body
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162 string += 1; // skip trailing null
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163 }
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164 return "BAD_SID";
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165 }
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166 #endif
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167
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168
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169
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170 void vmSymbols::oops_do(OopClosure* f, bool do_all) {
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171 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
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172 f->do_oop((oop*) &_symbols[index]);
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173 }
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174 for (int i = 0; i < T_VOID+1; i++) {
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175 if (_type_signatures[i] != NULL) {
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176 assert(i >= T_BOOLEAN, "checking");
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177 f->do_oop((oop*)&_type_signatures[i]);
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178 } else if (do_all) {
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179 f->do_oop((oop*)&_type_signatures[i]);
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180 }
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181 }
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182 }
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183
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184
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185 BasicType vmSymbols::signature_type(symbolOop s) {
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186 assert(s != NULL, "checking");
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187 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
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188 if (s == _type_signatures[i]) {
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189 return (BasicType)i;
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190 }
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191 }
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192 return T_OBJECT;
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193 }
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194
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195
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196 static int mid_hint = (int)vmSymbols::FIRST_SID+1;
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197
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198 #ifndef PRODUCT
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199 static int find_sid_calls, find_sid_probes;
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200 // (Typical counts are calls=7000 and probes=17000.)
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201 #endif
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202
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203 vmSymbols::SID vmSymbols::find_sid(symbolOop symbol) {
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204 // Handle the majority of misses by a bounds check.
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205 // Then, use a binary search over the index.
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206 // Expected trip count is less than log2_SID_LIMIT, about eight.
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207 // This is slow but acceptable, given that calls are not
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208 // dynamically common. (methodOop::intrinsic_id has a cache.)
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209 NOT_PRODUCT(find_sid_calls++);
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210 int min = (int)FIRST_SID, max = (int)SID_LIMIT - 1;
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211 SID sid = NO_SID, sid1;
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212 int cmp1;
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213 sid1 = vm_symbol_index[min];
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214 cmp1 = compare_symbol(symbol, symbol_at(sid1));
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215 if (cmp1 <= 0) { // before the first
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216 if (cmp1 == 0) sid = sid1;
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217 } else {
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218 sid1 = vm_symbol_index[max];
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219 cmp1 = compare_symbol(symbol, symbol_at(sid1));
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220 if (cmp1 >= 0) { // after the last
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221 if (cmp1 == 0) sid = sid1;
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222 } else {
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223 // After checking the extremes, do a binary search.
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224 ++min; --max; // endpoints are done
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225 int mid = mid_hint; // start at previous success
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226 while (max >= min) {
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227 assert(mid >= min && mid <= max, "");
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228 NOT_PRODUCT(find_sid_probes++);
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229 sid1 = vm_symbol_index[mid];
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230 cmp1 = compare_symbol(symbol, symbol_at(sid1));
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231 if (cmp1 == 0) {
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232 mid_hint = mid;
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233 sid = sid1;
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234 break;
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235 }
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236 if (cmp1 < 0)
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237 max = mid - 1; // symbol < symbol_at(sid)
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238 else
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239 min = mid + 1;
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240
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241 // Pick a new probe point:
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242 mid = (max + min) / 2;
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243 }
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244 }
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245 }
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246
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247 #ifdef ASSERT
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248 // Perform the exhaustive self-check the first 1000 calls,
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249 // and every 100 calls thereafter.
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250 static int find_sid_check_count = -2000;
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251 if ((uint)++find_sid_check_count > (uint)100) {
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252 if (find_sid_check_count > 0) find_sid_check_count = 0;
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253
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254 // Make sure this is the right answer, using linear search.
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255 // (We have already proven that there are no duplicates in the list.)
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256 SID sid2 = NO_SID;
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257 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
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258 symbolOop sym2 = symbol_at((SID)index);
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259 if (sym2 == symbol) {
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260 sid2 = (SID)index;
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261 break;
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262 }
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263 }
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264 // Unless it's a duplicate, assert that the sids are the same.
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265 if (_symbols[sid] != _symbols[sid2]) {
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266 assert(sid == sid2, "binary same as linear search");
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267 }
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268 }
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269 #endif //ASSERT
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270
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271 return sid;
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272 }
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273
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274
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275 #define VM_INTRINSIC_INITIALIZE(id, klass, name, sig, flags) #id "\0"
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276 static const char* vm_intrinsic_name_bodies =
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277 VM_INTRINSICS_DO(VM_INTRINSIC_INITIALIZE,
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278 VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
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279
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280 static const char* vm_intrinsic_name_table[vmIntrinsics::ID_LIMIT];
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281
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282 const char* vmIntrinsics::name_at(vmIntrinsics::ID id) {
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283 const char** nt = &vm_intrinsic_name_table[0];
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284 if (nt[_none] == NULL) {
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285 char* string = (char*) &vm_intrinsic_name_bodies[0];
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286 for (int index = FIRST_ID; index < ID_LIMIT; index++) {
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287 nt[index] = string;
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288 string += strlen(string); // skip string body
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289 string += 1; // skip trailing null
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290 }
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291 assert(!strcmp(nt[_hashCode], "_hashCode"), "lined up");
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292 nt[_none] = "_none";
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293 }
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294 if ((uint)id < (uint)ID_LIMIT)
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295 return vm_intrinsic_name_table[(uint)id];
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296 else
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297 return "(unknown intrinsic)";
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298 }
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299
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300 // These are flag-matching functions:
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301 inline bool match_F_R(jshort flags) {
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302 const int req = 0;
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303 const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED;
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304 return (flags & (req | neg)) == req;
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305 }
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306 inline bool match_F_RN(jshort flags) {
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307 const int req = JVM_ACC_NATIVE;
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308 const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED;
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309 return (flags & (req | neg)) == req;
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310 }
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311 inline bool match_F_S(jshort flags) {
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312 const int req = JVM_ACC_STATIC;
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313 const int neg = JVM_ACC_SYNCHRONIZED;
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314 return (flags & (req | neg)) == req;
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315 }
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316 inline bool match_F_SN(jshort flags) {
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317 const int req = JVM_ACC_STATIC | JVM_ACC_NATIVE;
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318 const int neg = JVM_ACC_SYNCHRONIZED;
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319 return (flags & (req | neg)) == req;
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320 }
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321
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322 // These are for forming case labels:
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323 #define ID3(x, y, z) (( jint)(z) + \
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324 ((jint)(y) << vmSymbols::log2_SID_LIMIT) + \
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325 ((jint)(x) << (2*vmSymbols::log2_SID_LIMIT)) )
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326 #define SID_ENUM(n) vmSymbols::VM_SYMBOL_ENUM_NAME(n)
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327
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328 vmIntrinsics::ID vmIntrinsics::find_id(vmSymbols::SID holder,
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329 vmSymbols::SID name,
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330 vmSymbols::SID sig,
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331 jshort flags) {
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332 assert((int)vmSymbols::SID_LIMIT <= (1<<vmSymbols::log2_SID_LIMIT), "must fit");
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333
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334 // Let the C compiler build the decision tree.
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335
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336 #define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
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337 case ID3(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig)): \
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338 if (!match_##fcode(flags)) break; \
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339 return id;
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340
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341 switch (ID3(holder, name, sig)) {
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342 VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
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343 VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
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344 }
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345 return vmIntrinsics::_none;
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346
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347 #undef VM_INTRINSIC_CASE
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348 }
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349
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350
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351 const char* vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID id, char* buf, int buflen) {
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352 const char* str = name_at(id);
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353 #ifndef PRODUCT
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354 const char* kname = vmSymbols::name_for(class_for(id));
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355 const char* mname = vmSymbols::name_for(name_for(id));
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356 const char* sname = vmSymbols::name_for(signature_for(id));
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357 const char* fname = "";
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358 switch (flags_for(id)) {
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359 case F_RN: fname = "native "; break;
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360 case F_SN: fname = "native static "; break;
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361 case F_S: fname = "static "; break;
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362 }
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363 const char* kptr = strrchr(kname, '/');
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364 if (kptr != NULL) kname = kptr + 1;
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365 int len = jio_snprintf(buf, buflen, "%s: %s%s.%s%s",
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366 str, fname, kname, mname, sname);
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367 if (len < buflen)
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368 str = buf;
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369 #endif //PRODUCT
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370 return str;
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371 }
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372
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373
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374 // These are for friendly printouts of intrinsics:
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375
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376 vmSymbols::SID vmIntrinsics::class_for(vmIntrinsics::ID id) {
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377 #ifndef PRODUCT
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378 #define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
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379 case id: return SID_ENUM(klass);
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380
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381 switch (id) {
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382 VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
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383 VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
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384 }
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385 #undef VM_INTRINSIC_CASE
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386 #endif //PRODUCT
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387 return vmSymbols::NO_SID;
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388 }
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389
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390 vmSymbols::SID vmIntrinsics::name_for(vmIntrinsics::ID id) {
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391 #ifndef PRODUCT
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392 #define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
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393 case id: return SID_ENUM(name);
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394
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395 switch (id) {
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396 VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
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397 VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
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398 }
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399 #undef VM_INTRINSIC_CASE
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400 #endif //PRODUCT
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401 return vmSymbols::NO_SID;
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402 }
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403
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404 vmSymbols::SID vmIntrinsics::signature_for(vmIntrinsics::ID id) {
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405 #ifndef PRODUCT
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406 #define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
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407 case id: return SID_ENUM(sig);
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408
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409 switch (id) {
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410 VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
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411 VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
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412 }
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413 #undef VM_INTRINSIC_CASE
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414 #endif //PRODUCT
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415 return vmSymbols::NO_SID;
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416 }
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417
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418 vmIntrinsics::Flags vmIntrinsics::flags_for(vmIntrinsics::ID id) {
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419 #ifndef PRODUCT
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420 #define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
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421 case id: return fcode;
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422
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423 switch (id) {
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424 VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
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425 VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
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426 }
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427 #undef VM_INTRINSIC_CASE
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428 #endif //PRODUCT
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429 return F_none;
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430 }
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431
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432
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433 #ifndef PRODUCT
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434 // verify_method performs an extra check on a matched intrinsic method
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435
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436 static bool match_method(methodOop m, symbolOop n, symbolOop s) {
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437 return (m->name() == n &&
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438 m->signature() == s);
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439 }
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440
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441 static vmIntrinsics::ID match_method_with_klass(methodOop m, symbolOop mk) {
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442 #define VM_INTRINSIC_MATCH(id, klassname, namepart, sigpart, flags) \
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443 { symbolOop k = vmSymbols::klassname(); \
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444 if (mk == k) { \
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445 symbolOop n = vmSymbols::namepart(); \
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446 symbolOop s = vmSymbols::sigpart(); \
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447 if (match_method(m, n, s)) \
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448 return vmIntrinsics::id; \
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449 } }
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450 VM_INTRINSICS_DO(VM_INTRINSIC_MATCH,
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451 VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
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452 return vmIntrinsics::_none;
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453 #undef VM_INTRINSIC_MATCH
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454 }
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455
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456 void vmIntrinsics::verify_method(ID actual_id, methodOop m) {
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457 symbolOop mk = Klass::cast(m->method_holder())->name();
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458 ID declared_id = match_method_with_klass(m, mk);
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459
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460 if (declared_id == actual_id) return; // success
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461
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462 if (declared_id == _none && actual_id != _none && mk == vmSymbols::java_lang_StrictMath()) {
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463 // Here are a few special cases in StrictMath not declared in vmSymbols.hpp.
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464 switch (actual_id) {
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465 case _min:
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466 case _max:
|
|
467 case _dsqrt:
|
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468 declared_id = match_method_with_klass(m, vmSymbols::java_lang_Math());
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469 if (declared_id == actual_id) return; // acceptable alias
|
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470 break;
|
|
471 }
|
|
472 }
|
|
473
|
|
474 const char* declared_name = name_at(declared_id);
|
|
475 const char* actual_name = name_at(actual_id);
|
|
476 methodHandle mh = m;
|
|
477 m = NULL;
|
|
478 ttyLocker ttyl;
|
|
479 if (xtty != NULL) {
|
|
480 xtty->begin_elem("intrinsic_misdeclared actual='%s' declared='%s'",
|
|
481 actual_name, declared_name);
|
|
482 xtty->method(mh);
|
|
483 xtty->end_elem("");
|
|
484 }
|
|
485 if (PrintMiscellaneous && (WizardMode || Verbose)) {
|
|
486 tty->print_cr("*** misidentified method; %s(%d) should be %s(%d):",
|
|
487 declared_name, declared_id, actual_name, actual_id);
|
|
488 m->print_short_name(tty);
|
|
489 tty->cr();
|
|
490 }
|
|
491 }
|
|
492 #endif //PRODUCT
|