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. |
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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 |
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166 // objects in the shared archive file. |
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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 |
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171 // objects in the shared archive file. |
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172 // |
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173 // For this reason, THIS ALGORITHM MUST MATCH String.hashCode(). |
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174 static unsigned int hash_string(jchar* s, int len) { |
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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 } |
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178 static unsigned int to_hash(oop java_string); |
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179 |
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180 // This is the string hash code used by the StringTable, which may be |
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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 |