* Copyright (c) 1980 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
static char sccsid
[] = "@(#)address.c 5.1 (Berkeley) %G%";
* Some machine and runtime dependent manipulation of a symbol.
* Calculate the address of a symbol.
* If frame is not NIL, then it is the frame associated with the
* activation in which the symbol we're interested in is defined.
ADDRESS
address(s
, frame
)
offs
= f
->symvalue
.offset
;
offs
= s
->symvalue
.offset
;
r
= (ADDRESS
) dispval(MAINBLK
) + offs
;
} else if (f
== curfunc
&& frame
== NIL
) {
r
= (ADDRESS
) disp
+ offs
;
frp
= findframe(s
->func
);
panic("address: findframe returned NIL");
r
= stkaddr(frp
, s
->blkno
) + offs
;
* The next three routines assume the procedure entry code is
* B: <code for first line>
* Pi gives f, we compute and store A with "findbeginning(f)",
* (retrieved by "codeloc(f)"), B is computed by "firstline(f)".
* The procedure "runtofirst" assumes you're at A and want to step to B.
* It should be changed to a nop if A is equal to B.
* Find the beginning of a procedure or function. This is a destructive
* routine, it changes the value associated with the procedure symbol.
* Should only be called once per symbol.
f
->symvalue
.funcv
.codeloc
= nextaddr(f
->symvalue
.funcv
.codeloc
, FALSE
);
* Find the object code associated with the first line of a block.
while (linelookup(addr
) == 0) {
addr
= nextaddr(addr
, FALSE
);
* Catcher drops strike three ...
stepto(firstline(curfunc
));
* Calculate the address of the last line in the program.
* This is assumed to be at the physical end.
panic("lastaddr: objsize = 0!");
return(objsize
- sizeof(short));