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comparison src/share/vm/classfile/javaClasses.hpp @ 6166:58ad5f22317e

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Merge
author sla
date Mon, 18 Jun 2012 11:33:17 +0200
parents 8b0a4867acf0 e9140bf80b4a
children 1d7922586cf6
comparison
equal deleted inserted replaced
6161:1c280e5b8d31 6166:58ad5f22317e
156 static char* as_utf8_string(oop java_string, int start, int len); 156 static char* as_utf8_string(oop java_string, int start, int len);
157 static char* as_platform_dependent_str(Handle java_string, TRAPS); 157 static char* as_platform_dependent_str(Handle java_string, TRAPS);
158 static jchar* as_unicode_string(oop java_string, int& length); 158 static jchar* as_unicode_string(oop java_string, int& length);
159 159
160 // Compute the hash value for a java.lang.String object which would 160 // Compute the hash value for a java.lang.String object which would
161 // contain the characters passed in. This hash value is used for at 161 // contain the characters passed in.
162 // least two purposes.
163 // 162 //
164 // (a) As the hash value used by the StringTable for bucket selection 163 // As the hash value used by the String object itself, in
165 // and comparison (stored in the HashtableEntry structures). This 164 // String.hashCode(). This value is normally calculated in Java code
166 // is used in the String.intern() method. 165 // in the String.hashCode method(), but is precomputed for String
166 // objects in the shared archive file.
167 // hash P(31) from Kernighan & Ritchie
167 // 168 //
168 // (b) As the hash value used by the String object itself, in 169 // For this reason, THIS ALGORITHM MUST MATCH String.toHash().
169 // String.hashCode(). This value is normally calculate in Java code 170 template <typename T> static unsigned int to_hash(T* s, int len) {
170 // in the String.hashCode method(), but is precomputed for String
171 // objects in the shared archive file.
172 //
173 // For this reason, THIS ALGORITHM MUST MATCH String.hashCode().
174 static unsigned int hash_string(jchar* s, int len) {
175 unsigned int h = 0; 171 unsigned int h = 0;
176 while (len-- > 0) { 172 while (len-- > 0) {
177 h = 31*h + (unsigned int) *s; 173 h = 31*h + (unsigned int) *s;
178 s++; 174 s++;
179 } 175 }
180 return h; 176 return h;
181 } 177 }
178 static unsigned int to_hash(oop java_string);
179
180 // This is the string hash code used by the StringTable, which may be
181 // the same as String.toHash or an alternate hash code.
182 static unsigned int hash_string(oop java_string); 182 static unsigned int hash_string(oop java_string);
183 183
184 static bool equals(oop java_string, jchar* chars, int len); 184 static bool equals(oop java_string, jchar* chars, int len);
185 185
186 // Conversion between '.' and '/' formats 186 // Conversion between '.' and '/' formats