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1 /*
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2 * Copyright 1997-2005 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 symbolOop is a canonicalized string.
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26 // All symbolOops reside in global symbolTable.
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27 // See oopFactory::new_symbol for how to allocate a symbolOop
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28
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29 class symbolOopDesc : public oopDesc {
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30 friend class VMStructs;
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31 private:
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32 unsigned short _length; // number of UTF8 characters in the symbol
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33 jbyte _body[1];
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34
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35 enum {
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36 // max_symbol_length is constrained by type of _length
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37 max_symbol_length = (1 << 16) -1
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38 };
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39 public:
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40
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41 // Low-level access (used with care, since not GC-safe)
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42 jbyte* base() { return &_body[0]; }
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43
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44
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45 // Returns the largest size symbol we can safely hold.
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46 static int max_length() {
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47 return max_symbol_length;
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48 }
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49
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50 static int object_size(int length) {
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51 int size = header_size() + (sizeof(unsigned short) + length + HeapWordSize - 1) / HeapWordSize;
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52 return align_object_size(size);
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53 }
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54
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55 int object_size() { return object_size(utf8_length()); }
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56
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57 int byte_at(int index) const {
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58 assert(index >=0 && index < _length, "symbol index overflow");
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59 return ((symbolOopDesc*)this)->base()[index];
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60 }
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61
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62 void byte_at_put(int index, int value) {
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63 assert(index >=0 && index < _length, "symbol index overflow");
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64 ((symbolOopDesc*)this)->base()[index] = value;
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65 }
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66
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67 jbyte* bytes() { return base(); }
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68
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69 int utf8_length() const { return _length; }
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70
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71 void set_utf8_length(int len) { _length = len; }
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72
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73 // Compares the symbol with a string
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74 bool equals(const char* str, int len) const;
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75
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76 // Three-way compare for sorting; returns -1/0/1 if receiver is </==/> than arg
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77 // note that the ordering is not alfabetical
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78 inline int fast_compare(symbolOop other) const;
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79
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80 // Returns receiver converted to null-terminated UTF-8 string; string is
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81 // allocated in resource area, or in the char buffer provided by caller.
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82 char* as_C_string() const;
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83 char* as_C_string(char* buf, int size) const;
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84 // Use buf if needed buffer length is <= size.
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85 char* as_C_string_flexible_buffer(Thread* t, char* buf, int size) const;
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86
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87
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88 // Returns a null terminated utf8 string in a resource array
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89 char* as_utf8() const { return as_C_string(); }
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90 char* as_utf8_flexible_buffer(Thread* t, char* buf, int size) const {
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91 return as_C_string_flexible_buffer(t, buf, size);
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92 }
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93
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94 jchar* as_unicode(int& length) const;
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95
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96 // Treating this symbol as a class name, returns the Java name for the class.
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97 // String is allocated in resource area if buffer is not provided.
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98 // See Klass::external_name()
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99 const char* as_klass_external_name() const;
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100 const char* as_klass_external_name(char* buf, int size) const;
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101
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102 bool object_is_parsable() const {
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103 return (utf8_length() > 0 || (oop)this == Universe::emptySymbol());
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104 }
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105
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106 // Printing
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107 void print_symbol_on(outputStream* st = NULL);
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108 };
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109
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110
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111 // Note: this comparison is used for vtable sorting only; it doesn't matter
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112 // what order it defines, as long as it is a total, time-invariant order
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113 // Since symbolOops are in permSpace, their relative order in memory never changes,
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114 // so use address comparison for speed
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115 int symbolOopDesc::fast_compare(symbolOop other) const {
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116 return (((uintptr_t)this < (uintptr_t)other) ? -1
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117 : ((uintptr_t)this == (uintptr_t) other) ? 0 : 1);
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118 }
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