| /* 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 */ |