// --- generate
address MethodStubBlob::generate( heapRef moop, address c2i_adapter ) {
// NativeMethodStubs must be jumped-to directly and are packed back-to-back.
// Hence they start CodeEntryAligned, and each later one has to be
// CodeEntryAligned so we expect the instruction_size to be a multiple.
assert0( round_to(NativeMethodStub::instruction_size,CodeEntryAlignment) == NativeMethodStub::instruction_size );
NativeMethodStub *nms;
do {
// The _free_list is a racing CAS-managed link-list. Must read the
// _free_list exactly ONCE before the CAS attempt below, or otherwise know
// we have something that used to be on the free_list and is not-null. In
// generally, if we re-read the free_list we have to null-check the result.
nms = _free_list;
if( !nms ) {
// CodeCache makes CodeBlobs. Make a CodeBlob typed as a methodCodeStub.
CodeBlob *cb = CodeCache::malloc_CodeBlob( CodeBlob::methodstub, 256*NativeMethodStub::instruction_size );
address adr = (address)round_to((intptr_t)cb->code_begins(),CodeEntryAlignment);
cb->_code_start_offset = adr-(address)cb->_code_begins;
while( adr+NativeMethodStub::instruction_size < cb->end() ) {
free_stub((NativeMethodStub*)adr);
adr += NativeMethodStub::instruction_size;
}
// The last not-null thing jammed on the freelist.
nms = (NativeMethodStub*)(adr-NativeMethodStub::instruction_size);
}
} while( Atomic::cmpxchg_ptr(*(NativeMethodStub**)nms,&_free_list,nms) != nms );
nms->fill( moop, c2i_adapter );
return(address)nms;
}
