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Diffstat (limited to 'gas/subsegs.h')
| -rw-r--r-- | gas/subsegs.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/gas/subsegs.h b/gas/subsegs.h new file mode 100644 index 0000000..4840d5b --- /dev/null +++ b/gas/subsegs.h @@ -0,0 +1,159 @@ +/* subsegs.h -> subsegs.c + Copyright (C) 1987, 92, 93, 94, 95, 96, 1998 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 2, 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, 59 Temple Place - Suite 330, Boston, MA + 02111-1307, 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. + */ + +#include "obstack.h" + +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 */ +#ifdef BFD_ASSEMBLER + fixS *fix_root; /* Root of fixups for this subsegment. */ + fixS *fix_tail; /* Last fixup for this subsegment. */ +#endif + struct obstack frch_obstack; /* for objects in this frag chain */ + fragS *frch_frag_now; /* frag_now for this subsegment */ +}; + +typedef struct frchain frchainS; + +/* All subsegments' chains hang off here. NULL means no frchains yet. */ +extern frchainS *frchain_root; + +/* Frchain we are assembling into now. That is, the current segment's + frag chain, even if it contains no (complete) frags. */ +extern frchainS *frchain_now; + + +typedef struct segment_info_struct +{ + frchainS *frchainP; + unsigned int hadone : 1; + + /* This field is set if this is a .bss section which does not really + have any contents. Once upon a time a .bss section did not have + any frags, but that is no longer true. This field prevent the + SEC_HAS_CONTENTS flag from being set for the section even if + there are frags. */ + unsigned int bss : 1; + + int user_stuff; + + /* Fixups for this segment. If BFD_ASSEMBLER, this is only valid + after the frchains are run together. */ + fixS *fix_root; + fixS *fix_tail; + +#if defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER) + struct internal_scnhdr scnhdr; + enum linkonce_type linkonce; + const char *name; +#endif + + symbolS *dot; + + struct lineno_list *lineno_list_head; + struct lineno_list *lineno_list_tail; + +#ifdef BFD_ASSEMBLER + /* Which BFD section does this gas segment correspond to? */ + asection *bfd_section; + + /* NULL, or pointer to the gas symbol that is the section symbol for + this section. sym->bsym and bfd_section->symbol should be the same. */ + symbolS *sym; +#endif + + union + { + /* Current size of section holding stabs strings. */ + unsigned long stab_string_size; + /* Initial frag for ELF. */ + char *p; + } + stabu; + +#ifdef NEED_LITERAL_POOL + unsigned long literal_pool_size; +#endif + +#ifdef TC_SEGMENT_INFO_TYPE + TC_SEGMENT_INFO_TYPE tc_segment_info_data; +#endif +} segment_info_type; + +#ifdef BFD_ASSEMBLER + +extern segment_info_type *seg_info PARAMS ((segT)); +extern symbolS *section_symbol PARAMS ((segT)); + +#else /* ! BFD_ASSEMBLER */ + +#ifdef MANY_SEGMENTS + +extern segment_info_type segment_info[]; + +#define seg_info(SEC) (&segment_info[SEC]) + +#else + +/* Sentinel for frchain crawling. Points to the 1st data-segment + frchain. (Which is pointed to by the last text-segment frchain.) */ +extern frchainS *data0_frchainP; +extern frchainS *bss0_frchainP; + +/* Dummy so stuff can compile. Should never be used. */ +struct seg_info_trash { + struct { + unsigned stab_string_size : 1; + } stabu; + unsigned hadone : 1; +}; +#define seg_info(S) (abort (), (struct seg_info_trash *) 0) + +#endif + +#endif /* ! BFD_ASSEMBLER */ + +extern void subsegs_print_statistics PARAMS ((FILE *)); + +/* end of subsegs.h */ |