/* Sun-$Revision: 23.2 $ */
/* Copyright 1992-9 Sun Microsystems, Inc. and Stanford University.
See the LICENSE file for license information. */
# pragma interface
// Some machines (e.g. PPC) place a limit on fast branch spans
// This causes problems for backpatched calls which are normally
// short (within the zone) but are sometimes longer (e.g. SendMessage_stub)
// So, we put long branches to the stubs in the zone (the TRAPDOORS) and
// use short branches to the trapdoors in the nmethods.
// -- dmu 6/99
class Trapdoors: public CHeapObj {
private:
public:
Trapdoors(pc_t start_of_code, int32 code_size); // make trapdoors, put code at start_of_code
int32 trapdoor_bytes(); // size of trapdoor code
// stub addresses (first inst addr)
pc_t SendMessage_stub_td(Location tmp = IllegalLocation);
pc_t SendDIMessage_stub_td(Location tmp = IllegalLocation);
pc_t Recompile_stub_td(Location tmp = IllegalLocation);
pc_t DIRecompile_stub_td(Location tmp = IllegalLocation);
pc_t follow_trapdoors(pc_t); // if arg is trapdoor, return its destination
# include "_trapdoors_pd.h.incl"
};
