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7158800: Improve storage of symbol tables

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Use an alternate version of hashing algorithm for symbol string tables and after a certain bucket size to improve performance

Reviewed-by: pbk, kamg, dlong, kvn, fparain
This commit is contained in:
Coleen Phillimore 2012-06-13 19:52:59 -04:00
parent 7c17e9e75b
commit 55b09e7016
17 changed files with 32031 additions and 55 deletions
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22
hotspot/src/share/vm/classfile/javaClasses.cpp
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@ -23,6 +23,7 @@
*/
#include "precompiled.hpp"
#include "classfile/altHashing.hpp"
#include "classfile/javaClasses.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/vmSymbols.hpp"
@ -347,13 +348,26 @@ jchar* java_lang_String::as_unicode_string(oop java_string, int& length) {
return result;
}
unsigned int java_lang_String::hash_string(oop java_string) {
unsigned int java_lang_String::to_hash(oop java_string) {
int length = java_lang_String::length(java_string);
// Zero length string will hash to zero with String.toHash() function.
if (length == 0) return 0;
typeArrayOop value = java_lang_String::value(java_string);
int offset = java_lang_String::offset(java_string);
int length = java_lang_String::length(java_string);
return java_lang_String::to_hash(value->char_at_addr(offset), length);
}
if (length == 0) return 0;
return hash_string(value->char_at_addr(offset), length);
unsigned int java_lang_String::hash_string(oop java_string) {
int length = java_lang_String::length(java_string);
// Zero length string doesn't hash necessarily hash to zero.
if (length == 0) {
return StringTable::hash_string(NULL, 0);
}
typeArrayOop value = java_lang_String::value(java_string);
int offset = java_lang_String::offset(java_string);
return StringTable::hash_string(value->char_at_addr(offset), length);
}
Symbol* java_lang_String::as_symbol(Handle java_string, TRAPS) {