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1 /*
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2 * Copyright 2003-2006 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 enum {
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26 // As specifed in the JVM spec
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27 ITEM_Top = 0,
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28 ITEM_Integer = 1,
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29 ITEM_Float = 2,
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30 ITEM_Double = 3,
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31 ITEM_Long = 4,
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32 ITEM_Null = 5,
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33 ITEM_UninitializedThis = 6,
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34 ITEM_Object = 7,
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35 ITEM_Uninitialized = 8,
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36 ITEM_Bogus = (uint)-1
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37 };
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38
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39 class VerificationType VALUE_OBJ_CLASS_SPEC {
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40 private:
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41 // Least significant bits of _handle are always 0, so we use these as
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42 // the indicator that the _handle is valid. Otherwise, the _data field
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43 // contains encoded data (as specified below). Should the VM change
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44 // and the lower bits on oops aren't 0, the assert in the constructor
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45 // will catch this and we'll have to add a descriminator tag to this
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46 // structure.
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47 union {
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48 symbolOop* _handle;
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49 uintptr_t _data;
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50 } _u;
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51
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52 enum {
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53 // These rest are not found in classfiles, but used by the verifier
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54 ITEM_Boolean = 9, ITEM_Byte, ITEM_Short, ITEM_Char,
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55 ITEM_Long_2nd, ITEM_Double_2nd
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56 };
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57
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58 // Enum for the _data field
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59 enum {
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60 // Bottom two bits determine if the type is a reference, primitive,
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61 // uninitialized or a query-type.
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62 TypeMask = 0x00000003,
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63
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64 // Topmost types encoding
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65 Reference = 0x0, // _handle contains the name
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66 Primitive = 0x1, // see below for primitive list
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67 Uninitialized = 0x2, // 0x00ffff00 contains bci
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68 TypeQuery = 0x3, // Meta-types used for category testing
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69
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70 // Utility flags
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71 ReferenceFlag = 0x00, // For reference query types
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72 Category1Flag = 0x01, // One-word values
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73 Category2Flag = 0x02, // First word of a two-word value
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74 Category2_2ndFlag = 0x04, // Second word of a two-word value
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75
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76 // special reference values
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77 Null = 0x00000000, // A reference with a 0 handle is null
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78
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79 // Primitives categories (the second byte determines the category)
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80 Category1 = (Category1Flag << 1 * BitsPerByte) | Primitive,
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81 Category2 = (Category2Flag << 1 * BitsPerByte) | Primitive,
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82 Category2_2nd = (Category2_2ndFlag << 1 * BitsPerByte) | Primitive,
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83
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84 // Primitive values (type descriminator stored in most-signifcant bytes)
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85 Bogus = (ITEM_Bogus << 2 * BitsPerByte) | Category1,
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86 Boolean = (ITEM_Boolean << 2 * BitsPerByte) | Category1,
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87 Byte = (ITEM_Byte << 2 * BitsPerByte) | Category1,
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88 Short = (ITEM_Short << 2 * BitsPerByte) | Category1,
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89 Char = (ITEM_Char << 2 * BitsPerByte) | Category1,
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90 Integer = (ITEM_Integer << 2 * BitsPerByte) | Category1,
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91 Float = (ITEM_Float << 2 * BitsPerByte) | Category1,
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92 Long = (ITEM_Long << 2 * BitsPerByte) | Category2,
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93 Double = (ITEM_Double << 2 * BitsPerByte) | Category2,
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94 Long_2nd = (ITEM_Long_2nd << 2 * BitsPerByte) | Category2_2nd,
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95 Double_2nd = (ITEM_Double_2nd << 2 * BitsPerByte) | Category2_2nd,
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96
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97 // Used by Uninitialized (second and third bytes hold the bci)
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98 BciMask = 0xffff << 1 * BitsPerByte,
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99 BciForThis = ((u2)-1), // A bci of -1 is an Unintialized-This
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100
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101 // Query values
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102 ReferenceQuery = (ReferenceFlag << 1 * BitsPerByte) | TypeQuery,
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103 Category1Query = (Category1Flag << 1 * BitsPerByte) | TypeQuery,
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104 Category2Query = (Category2Flag << 1 * BitsPerByte) | TypeQuery,
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105 Category2_2ndQuery = (Category2_2ndFlag << 1 * BitsPerByte) | TypeQuery
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106 };
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107
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108 VerificationType(uintptr_t raw_data) {
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109 _u._data = raw_data;
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110 }
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111
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112 public:
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113
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114 VerificationType() { *this = bogus_type(); }
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115
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116 // Create verification types
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117 static VerificationType bogus_type() { return VerificationType(Bogus); }
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118 static VerificationType null_type() { return VerificationType(Null); }
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119 static VerificationType integer_type() { return VerificationType(Integer); }
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120 static VerificationType float_type() { return VerificationType(Float); }
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121 static VerificationType long_type() { return VerificationType(Long); }
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122 static VerificationType long2_type() { return VerificationType(Long_2nd); }
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123 static VerificationType double_type() { return VerificationType(Double); }
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124 static VerificationType boolean_type() { return VerificationType(Boolean); }
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125 static VerificationType byte_type() { return VerificationType(Byte); }
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126 static VerificationType char_type() { return VerificationType(Char); }
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127 static VerificationType short_type() { return VerificationType(Short); }
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128 static VerificationType double2_type()
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129 { return VerificationType(Double_2nd); }
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130
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131 // "check" types are used for queries. A "check" type is not assignable
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132 // to anything, but the specified types are assignable to a "check". For
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133 // example, any category1 primitive is assignable to category1_check and
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134 // any reference is assignable to reference_check.
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135 static VerificationType reference_check()
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136 { return VerificationType(ReferenceQuery); }
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137 static VerificationType category1_check()
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138 { return VerificationType(Category1Query); }
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139 static VerificationType category2_check()
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140 { return VerificationType(Category2Query); }
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141 static VerificationType category2_2nd_check()
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142 { return VerificationType(Category2_2ndQuery); }
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143
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144 // For reference types, store the actual oop* handle
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145 static VerificationType reference_type(symbolHandle sh) {
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146 assert(((uintptr_t)sh.raw_value() & 0x3) == 0, "Oops must be aligned");
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147 // If the above assert fails in the future because oop* isn't aligned,
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148 // then this type encoding system will have to change to have a tag value
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149 // to descriminate between oops and primitives.
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150 return VerificationType((uintptr_t)((symbolOop*)sh.raw_value()));
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151 }
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152 static VerificationType reference_type(symbolOop s, TRAPS)
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153 { return reference_type(symbolHandle(THREAD, s)); }
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154
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155 static VerificationType uninitialized_type(u2 bci)
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156 { return VerificationType(bci << 1 * BitsPerByte | Uninitialized); }
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157 static VerificationType uninitialized_this_type()
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158 { return uninitialized_type(BciForThis); }
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159
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160 // Create based on u1 read from classfile
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161 static VerificationType from_tag(u1 tag);
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162
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163 bool is_bogus() const { return (_u._data == Bogus); }
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164 bool is_null() const { return (_u._data == Null); }
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165 bool is_boolean() const { return (_u._data == Boolean); }
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166 bool is_byte() const { return (_u._data == Byte); }
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167 bool is_char() const { return (_u._data == Char); }
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168 bool is_short() const { return (_u._data == Short); }
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169 bool is_integer() const { return (_u._data == Integer); }
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170 bool is_long() const { return (_u._data == Long); }
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171 bool is_float() const { return (_u._data == Float); }
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172 bool is_double() const { return (_u._data == Double); }
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173 bool is_long2() const { return (_u._data == Long_2nd); }
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174 bool is_double2() const { return (_u._data == Double_2nd); }
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175 bool is_reference() const { return ((_u._data & TypeMask) == Reference); }
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176 bool is_category1() const {
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177 // This should return true for all one-word types, which are category1
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178 // primitives, and references (including uninitialized refs). Though
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179 // the 'query' types should technically return 'false' here, if we
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180 // allow this to return true, we can perform the test using only
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181 // 2 operations rather than 8 (3 masks, 3 compares and 2 logical 'ands').
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182 // Since noone should call this on a query type anyway, this is ok.
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183 assert(!is_check(), "Must not be a check type (wrong value returned)");
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184 return ((_u._data & Category1) != Primitive);
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185 // should only return false if it's a primitive, and the category1 flag
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186 // is not set.
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187 }
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188 bool is_category2() const { return ((_u._data & Category2) == Category2); }
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189 bool is_category2_2nd() const {
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190 return ((_u._data & Category2_2nd) == Category2_2nd);
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191 }
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192 bool is_reference_check() const { return _u._data == ReferenceQuery; }
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193 bool is_category1_check() const { return _u._data == Category1Query; }
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194 bool is_category2_check() const { return _u._data == Category2Query; }
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195 bool is_category2_2nd_check() const { return _u._data == Category2_2ndQuery; }
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196 bool is_check() const { return (_u._data & TypeQuery) == TypeQuery; }
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197
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198 bool is_x_array(char sig) const {
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199 return is_null() || (is_array() && (name()->byte_at(1) == sig));
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200 }
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201 bool is_int_array() const { return is_x_array('I'); }
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202 bool is_byte_array() const { return is_x_array('B'); }
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203 bool is_bool_array() const { return is_x_array('Z'); }
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204 bool is_char_array() const { return is_x_array('C'); }
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205 bool is_short_array() const { return is_x_array('S'); }
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206 bool is_long_array() const { return is_x_array('J'); }
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207 bool is_float_array() const { return is_x_array('F'); }
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208 bool is_double_array() const { return is_x_array('D'); }
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209 bool is_object_array() const { return is_x_array('L'); }
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210 bool is_array_array() const { return is_x_array('['); }
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211 bool is_reference_array() const
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212 { return is_object_array() || is_array_array(); }
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213 bool is_object() const
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214 { return (is_reference() && !is_null() && name()->utf8_length() >= 1 &&
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215 name()->byte_at(0) != '['); }
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216 bool is_array() const
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217 { return (is_reference() && !is_null() && name()->utf8_length() >= 2 &&
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218 name()->byte_at(0) == '['); }
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219 bool is_uninitialized() const
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220 { return ((_u._data & Uninitialized) == Uninitialized); }
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221 bool is_uninitialized_this() const
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222 { return is_uninitialized() && bci() == BciForThis; }
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223
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224 VerificationType to_category2_2nd() const {
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225 assert(is_category2(), "Must be a double word");
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226 return VerificationType(is_long() ? Long_2nd : Double_2nd);
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227 }
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228
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229 u2 bci() const {
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230 assert(is_uninitialized(), "Must be uninitialized type");
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231 return ((_u._data & BciMask) >> 1 * BitsPerByte);
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232 }
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233
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234 symbolHandle name_handle() const {
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235 assert(is_reference() && !is_null(), "Must be a non-null reference");
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236 return symbolHandle(_u._handle, true);
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237 }
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238 symbolOop name() const {
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239 assert(is_reference() && !is_null(), "Must be a non-null reference");
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240 return *(_u._handle);
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241 }
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242
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243 bool equals(const VerificationType& t) const {
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244 return (_u._data == t._u._data ||
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245 (is_reference() && t.is_reference() && !is_null() && !t.is_null() &&
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246 name() == t.name()));
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247 }
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248
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249 bool operator ==(const VerificationType& t) const {
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250 return equals(t);
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251 }
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252
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253 bool operator !=(const VerificationType& t) const {
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254 return !equals(t);
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255 }
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256
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257 // The whole point of this type system - check to see if one type
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258 // is assignable to another. Returns true if one can assign 'from' to
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259 // this.
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260 bool is_assignable_from(
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261 const VerificationType& from, instanceKlassHandle context, TRAPS) const {
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262 if (equals(from) || is_bogus()) {
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263 return true;
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264 } else {
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265 switch(_u._data) {
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266 case Category1Query:
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267 return from.is_category1();
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268 case Category2Query:
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269 return from.is_category2();
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270 case Category2_2ndQuery:
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271 return from.is_category2_2nd();
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272 case ReferenceQuery:
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273 return from.is_reference() || from.is_uninitialized();
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274 case Boolean:
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275 case Byte:
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276 case Char:
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277 case Short:
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278 // An int can be assigned to boolean, byte, char or short values.
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279 return from.is_integer();
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280 default:
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281 if (is_reference() && from.is_reference()) {
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282 return is_reference_assignable_from(from, context, CHECK_false);
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283 } else {
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284 return false;
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285 }
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286 }
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287 }
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288 }
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289
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290 VerificationType get_component(TRAPS) const;
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291
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292 int dimensions() const {
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293 assert(is_array(), "Must be an array");
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294 int index = 0;
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295 while (name()->byte_at(index++) == '[');
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296 return index;
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297 }
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298
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299 void print_on(outputStream* st) const PRODUCT_RETURN;
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300
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301 private:
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302
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303 bool is_reference_assignable_from(
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304 const VerificationType&, instanceKlassHandle, TRAPS) const;
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305 };
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