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8150752: Share Class Data

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Reviewed-by: acorn, hseigel, mschoene
This commit is contained in:
Ioi Lam 2016-04-06 21:53:44 -07:00
parent 99c24f5f1c
commit 2a09a3923a
8 changed files with 98 additions and 26 deletions
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23
hotspot/src/share/vm/classfile/symbolTable.cpp
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@ -238,6 +238,29 @@ Symbol* SymbolTable::lookup(int index, const char* name,
}
}
u4 SymbolTable::encode_shared(Symbol* sym) {
assert(DumpSharedSpaces, "called only during dump time");
uintx base_address = uintx(MetaspaceShared::shared_rs()->base());
uintx offset = uintx(sym) - base_address;
assert(offset < 0x7fffffff, "sanity");
return u4(offset);
}
Symbol* SymbolTable::decode_shared(u4 offset) {
assert(!DumpSharedSpaces, "called only during runtime");
uintx base_address = _shared_table.base_address();
Symbol* sym = (Symbol*)(base_address + offset);
#ifndef PRODUCT
const char* s = (const char*)sym->bytes();
int len = sym->utf8_length();
unsigned int hash = hash_symbol(s, len);
assert(sym == lookup_shared(s, len, hash), "must be shared symbol");
#endif
return sym;
}
// Pick hashing algorithm.
unsigned int SymbolTable::hash_symbol(const char* s, int len) {
return use_alternate_hashcode() ?