66 lines
2.5 KiB
C
66 lines
2.5 KiB
C
|
/* subsegs.h -> subsegs.c
|
||
|
|
Copyright (C) 1987 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
This file is part of GAS, the GNU Assembler.
|
||
|
|
|
||
|
|
GAS is free software; you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation; either version 1, or (at your option)
|
||
|
|
any later version.
|
||
|
|
|
||
|
|
GAS is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with GAS; see the file COPYING. If not, write to
|
||
|
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* For every sub-segment the user mentions in the ASsembler program,
|
||
|
|
* we make one struct frchain. Each sub-segment has exactly one struct frchain
|
||
|
|
* and vice versa.
|
||
|
|
*
|
||
|
|
* Struct frchain's are forward chained (in ascending order of sub-segment
|
||
|
|
* code number). The chain runs through frch_next of each subsegment.
|
||
|
|
* This makes it hard to find a subsegment's frags
|
||
|
|
* if programmer uses a lot of them. Most programs only use text0 and
|
||
|
|
* data0, so they don't suffer. At least this way:
|
||
|
|
* (1) There are no "arbitrary" restrictions on how many subsegments
|
||
|
|
* can be programmed;
|
||
|
|
* (2) Subsegments' frchain-s are (later) chained together in the order in
|
||
|
|
* which they are emitted for object file viz text then data.
|
||
|
|
*
|
||
|
|
* From each struct frchain dangles a chain of struct frags. The frags
|
||
|
|
* represent code fragments, for that sub-segment, forward chained.
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct frchain /* control building of a frag chain */
|
||
|
|
{ /* FRCH = FRagment CHain control */
|
||
|
|
struct frag * frch_root; /* 1st struct frag in chain, or NULL */
|
||
|
|
struct frag * frch_last; /* last struct frag in chain, or NULL */
|
||
|
|
struct frchain * frch_next; /* next in chain of struct frchain-s */
|
||
|
|
segT frch_seg; /* SEG_TEXT or SEG_DATA. */
|
||
|
|
subsegT frch_subseg; /* subsegment number of this chain */
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef struct frchain frchainS;
|
||
|
|
|
||
|
|
extern frchainS * frchain_root; /* NULL means no frchains yet. */
|
||
|
|
/* all subsegments' chains hang off here */
|
||
|
|
|
||
|
|
extern frchainS * frchain_now;
|
||
|
|
/* Frchain we are assembling into now */
|
||
|
|
/* That is, the current segment's frag */
|
||
|
|
/* chain, even if it contains no (complete) */
|
||
|
|
/* frags. */
|
||
|
|
|
||
|
|
extern frchainS * data0_frchainP;
|
||
|
|
/* Sentinel for frchain crawling. */
|
||
|
|
/* Points to the 1st data-segment frchain. */
|
||
|
|
/* (Which is pointed to by the last text- */
|
||
|
|
/* segment frchain.) */
|
||
|
|
|
||
|
|
/* end: subsegs.h */
|