m3core/src/runtime/common/RTMachine.i3

 Copyright (C) 1994, Digital Equipment Corporation.       
 All rights reserved.                                     
 See the file COPYRIGHT for a full description.           
                                                          
 Last modified on Tue May  2 11:42:57 PDT 1995 by kalsow  


 This interface defines platform (machine + OS) dependent
   types and constants. 


INTERFACE RTMachine;

------------------------------------------------------------------ heap ---


CONST

 The heap page size used to be machine-dependent, since it could depend
   on the architecture's VM page size (if VM was TRUE). VM is now always
   FALSE. Otherwise, 8192 bytes is a reasonable page size. The page size must
   be a power of two. 

  BytesPerHeapPage    = 8192;               (* bytes per page *)
  LogBytesPerHeapPage = 13;
  AdrPerHeapPage      = BytesPerHeapPage;   (* addresses per page *)
  LogAdrPerHeapPage   = LogBytesPerHeapPage;

--------------------------------------------------------- thread stacks ---


  
PointerAlignment = BYTESIZE(INTEGER);
  (* The C compiler allocates all pointers on 'PointerAlignment'-byte
     boundaries. The garbage collector scans thread stacks, but only
     looks at these possible pointer locations. Setting this value
     smaller than is needed will only make your system run slower.
     Setting it too large will cause the collector to collect storage
     that is not free. *)

----------------------------------------------- exception stack walking ---
 The FrameInfo type must minimally include fields named pc and sp. 


  
Has_stack_walker = FALSE;
  (* Indicates whether this platform supports the stack walking functions
     defined in the "RTStack" interface. *)

TYPE FrameInfo = RECORD pc, sp: ADDRESS END;

END RTMachine.