108
109 // This is an int because it needs atomic operation on the refcount. Mask hash
110 // in high half word. length is the number of UTF8 characters in the symbol
111 volatile uint32_t _hash_and_refcount;
112 u2 _length;
113 u1 _body[2];
114
115 enum {
116 max_symbol_length = 0xffff
117 };
118
119 static int byte_size(int length) {
120 // minimum number of natural words needed to hold these bits (no non-heap version)
121 return (int)(sizeof(Symbol) + (length > 2 ? length - 2 : 0));
122 }
123 static int size(int length) {
124 // minimum number of natural words needed to hold these bits (no non-heap version)
125 return (int)heap_word_size(byte_size(length));
126 }
127
128 void byte_at_put(int index, u1 value) {
129 assert(index >=0 && index < length(), "symbol index overflow");
130 _body[index] = value;
131 }
132
133 Symbol(const u1* name, int length, int refcount);
134 void* operator new(size_t size, int len) throw();
135 void* operator new(size_t size, int len, Arena* arena) throw();
136
137 void operator delete(void* p);
138
139 static short extract_hash(uint32_t value) { return (short)(value >> 16); }
140 static int extract_refcount(uint32_t value) { return value & 0xffff; }
141 static uint32_t pack_hash_and_refcount(short hash, int refcount);
142
143 int length() const { return _length; }
144
145 public:
146 // Low-level access (used with care, since not GC-safe)
147 const u1* base() const { return &_body[0]; }
148
149 int size() { return size(utf8_length()); }
150 int byte_size() { return byte_size(utf8_length()); }
151
152 // Symbols should be stored in the read-only region of CDS archive.
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108
109 // This is an int because it needs atomic operation on the refcount. Mask hash
110 // in high half word. length is the number of UTF8 characters in the symbol
111 volatile uint32_t _hash_and_refcount;
112 u2 _length;
113 u1 _body[2];
114
115 enum {
116 max_symbol_length = 0xffff
117 };
118
119 static int byte_size(int length) {
120 // minimum number of natural words needed to hold these bits (no non-heap version)
121 return (int)(sizeof(Symbol) + (length > 2 ? length - 2 : 0));
122 }
123 static int size(int length) {
124 // minimum number of natural words needed to hold these bits (no non-heap version)
125 return (int)heap_word_size(byte_size(length));
126 }
127
128 Symbol(const u1* name, int length, int refcount);
129 void* operator new(size_t size, int len) throw();
130 void* operator new(size_t size, int len, Arena* arena) throw();
131
132 void operator delete(void* p);
133
134 static short extract_hash(uint32_t value) { return (short)(value >> 16); }
135 static int extract_refcount(uint32_t value) { return value & 0xffff; }
136 static uint32_t pack_hash_and_refcount(short hash, int refcount);
137
138 int length() const { return _length; }
139
140 public:
141 // Low-level access (used with care, since not GC-safe)
142 const u1* base() const { return &_body[0]; }
143
144 int size() { return size(utf8_length()); }
145 int byte_size() { return byte_size(utf8_length()); }
146
147 // Symbols should be stored in the read-only region of CDS archive.
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