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