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7115199: Add event tracing hooks and Java Flight Recorder infrastructure

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Added a nop tracing infrastructure, JFR makefile changes and other infrastructure used only by JFR.

Reviewed-by: acorn, sspitsyn
This commit is contained in:
Markus Gronlund 2012-01-11 17:34:02 -05:00 • committed by Paul Hohensee
parent 849571d5b3
commit 007126d010
29 changed files with 352 additions and 11 deletions
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18
hotspot/src/share/vm/classfile/symbolTable.cpp
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@ -204,6 +204,24 @@ Symbol* SymbolTable::lookup_only(const char* name, int len,
return s;
}
// Look up the address of the literal in the SymbolTable for this Symbol*
// Do not create any new symbols
// Do not increment the reference count to keep this alive
Symbol** SymbolTable::lookup_symbol_addr(Symbol* sym){
unsigned int hash = hash_symbol((char*)sym->bytes(), sym->utf8_length());
int index = the_table()->hash_to_index(hash);
for (HashtableEntry<Symbol*>* e = the_table()->bucket(index); e != NULL; e = e->next()) {
if (e->hash() == hash) {
Symbol* literal_sym = e->literal();
if (sym == literal_sym) {
return e->literal_addr();
}
}
}
return NULL;
}
// Suggestion: Push unicode-based lookup all the way into the hashing
// and probing logic, so there is no need for convert_to_utf8 until
// an actual new Symbol* is created.