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Diffstat (limited to 'gas/subsegs.c')
| -rw-r--r-- | gas/subsegs.c | 618 |
1 files changed, 0 insertions, 618 deletions
diff --git a/gas/subsegs.c b/gas/subsegs.c deleted file mode 100644 index 70dda27903b..00000000000 --- a/gas/subsegs.c +++ /dev/null @@ -1,618 +0,0 @@ -/* subsegs.c - subsegments - - Copyright (C) 1987, 90, 91, 92, 93, 94, 95, 96, 97, 98, 1999 - 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. */ - -/* - * Segments & sub-segments. - */ - -#include "as.h" - -#include "subsegs.h" -#include "obstack.h" - -frchainS *frchain_root, *frchain_now; - -static struct obstack frchains; - -#ifndef BFD_ASSEMBLER -#ifdef MANY_SEGMENTS -segment_info_type segment_info[SEG_MAXIMUM_ORDINAL]; - -#else -/* Commented in "subsegs.h". */ -frchainS *data0_frchainP, *bss0_frchainP; - -#endif /* MANY_SEGMENTS */ -char const *const seg_name[] = -{ - "absolute", -#ifdef MANY_SEGMENTS - "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9", - "e10", "e11", "e12", "e13", "e14", "e15", "e16", "e17", "e18", "e19", - "e20", "e21", "e22", "e23", "e24", "e25", "e26", "e27", "e28", "e29", - "e30", "e31", "e32", "e33", "e34", "e35", "e36", "e37", "e38", "e39", -#else - "text", - "data", - "bss", -#endif /* MANY_SEGMENTS */ - "unknown", - "ASSEMBLER-INTERNAL-LOGIC-ERROR!", - "expr", - "debug", - "transfert vector preload", - "transfert vector postload", - "register", - "", -}; /* Used by error reporters, dumpers etc. */ -#else /* BFD_ASSEMBLER */ - -/* Gas segment information for bfd_abs_section_ptr and - bfd_und_section_ptr. */ -static segment_info_type *abs_seg_info; -static segment_info_type *und_seg_info; - -#endif /* BFD_ASSEMBLER */ - -static void subseg_set_rest PARAMS ((segT, subsegT)); - -static fragS dummy_frag; - -static frchainS absolute_frchain; - -void -subsegs_begin () -{ - /* Check table(s) seg_name[], seg_N_TYPE[] is in correct order */ -#if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER) - know (SEG_ABSOLUTE == 0); - know (SEG_TEXT == 1); - know (SEG_DATA == 2); - know (SEG_BSS == 3); - know (SEG_UNKNOWN == 4); - know (SEG_GOOF == 5); - know (SEG_EXPR == 6); - know (SEG_DEBUG == 7); - know (SEG_NTV == 8); - know (SEG_PTV == 9); - know (SEG_REGISTER == 10); - know (SEG_MAXIMUM_ORDINAL == SEG_REGISTER); -#endif - - obstack_begin (&frchains, chunksize); -#if __GNUC__ >= 2 - obstack_alignment_mask (&frchains) = __alignof__ (frchainS) - 1; -#endif - - frchain_root = NULL; - frchain_now = NULL; /* Warn new_subseg() that we are booting. */ - - frag_now = &dummy_frag; - -#ifndef BFD_ASSEMBLER - now_subseg = 42; /* Lie for 1st call to subseg_new. */ -#ifdef MANY_SEGMENTS - { - int i; - for (i = SEG_E0; i < SEG_UNKNOWN; i++) - { - subseg_set (i, 0); - segment_info[i].frchainP = frchain_now; - } - } -#else - subseg_set (SEG_DATA, 0); /* .data 0 */ - data0_frchainP = frchain_now; - - subseg_set (SEG_BSS, 0); - bss0_frchainP = frchain_now; - -#endif /* ! MANY_SEGMENTS */ -#endif /* ! BFD_ASSEMBLER */ - - absolute_frchain.frch_seg = absolute_section; - absolute_frchain.frch_subseg = 0; -#ifdef BFD_ASSEMBLER - absolute_frchain.fix_root = absolute_frchain.fix_tail = 0; -#endif - absolute_frchain.frch_frag_now = &zero_address_frag; - absolute_frchain.frch_root = absolute_frchain.frch_last = &zero_address_frag; -} - -/* - * subseg_change() - * - * Change the subsegment we are in, BUT DO NOT MAKE A NEW FRAG for the - * subsegment. If we are already in the correct subsegment, change nothing. - * This is used eg as a worker for subseg_set [which does make a new frag_now] - * and for changing segments after we have read the source. We construct eg - * fixSs even after the source file is read, so we do have to keep the - * segment context correct. - */ -void -subseg_change (seg, subseg) - register segT seg; - register int subseg; -{ - now_seg = seg; - now_subseg = subseg; - - if (now_seg == absolute_section) - return; - -#ifdef BFD_ASSEMBLER - { - segment_info_type *seginfo; - seginfo = (segment_info_type *) bfd_get_section_userdata (stdoutput, seg); - if (! seginfo) - { - seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo)); - memset ((PTR) seginfo, 0, sizeof (*seginfo)); - seginfo->fix_root = NULL; - seginfo->fix_tail = NULL; - seginfo->bfd_section = seg; - seginfo->sym = 0; - if (seg == bfd_abs_section_ptr) - abs_seg_info = seginfo; - else if (seg == bfd_und_section_ptr) - und_seg_info = seginfo; - else - bfd_set_section_userdata (stdoutput, seg, (PTR) seginfo); - } - } -#else -#ifdef MANY_SEGMENTS - seg_fix_rootP = &segment_info[seg].fix_root; - seg_fix_tailP = &segment_info[seg].fix_tail; -#else - if (seg == SEG_DATA) - { - seg_fix_rootP = &data_fix_root; - seg_fix_tailP = &data_fix_tail; - } - else if (seg == SEG_TEXT) - { - seg_fix_rootP = &text_fix_root; - seg_fix_tailP = &text_fix_tail; - } - else - { - know (seg == SEG_BSS); - seg_fix_rootP = &bss_fix_root; - seg_fix_tailP = &bss_fix_tail; - } - -#endif -#endif -} - -static void -subseg_set_rest (seg, subseg) - segT seg; - subsegT subseg; -{ - register frchainS *frcP; /* crawl frchain chain */ - register frchainS **lastPP; /* address of last pointer */ - frchainS *newP; /* address of new frchain */ - - mri_common_symbol = NULL; - - if (frag_now && frchain_now) - frchain_now->frch_frag_now = frag_now; - - assert (frchain_now == 0 - || now_seg == undefined_section - || now_seg == absolute_section - || frchain_now->frch_last == frag_now); - - subseg_change (seg, (int) subseg); - - if (seg == absolute_section) - { - frchain_now = &absolute_frchain; - frag_now = &zero_address_frag; - return; - } - - assert (frchain_now == 0 - || now_seg == undefined_section - || frchain_now->frch_last == frag_now); - - /* - * Attempt to find or make a frchain for that sub seg. - * Crawl along chain of frchainSs, begins @ frchain_root. - * If we need to make a frchainS, link it into correct - * position of chain rooted in frchain_root. - */ - for (frcP = *(lastPP = &frchain_root); - frcP && frcP->frch_seg <= seg; - frcP = *(lastPP = &frcP->frch_next)) - { - if (frcP->frch_seg == seg - && frcP->frch_subseg >= subseg) - { - break; - } - } - /* - * frcP: Address of the 1st frchainS in correct segment with - * frch_subseg >= subseg. - * We want to either use this frchainS, or we want - * to insert a new frchainS just before it. - * - * If frcP==NULL, then we are at the end of the chain - * of frchainS-s. A NULL frcP means we fell off the end - * of the chain looking for a - * frch_subseg >= subseg, so we - * must make a new frchainS. - * - * If we ever maintain a pointer to - * the last frchainS in the chain, we change that pointer - * ONLY when frcP==NULL. - * - * lastPP: Address of the pointer with value frcP; - * Never NULL. - * May point to frchain_root. - * - */ - if (!frcP - || (frcP->frch_seg > seg - || frcP->frch_subseg > subseg)) /* Kinky logic only works with 2 segments. */ - { - /* - * This should be the only code that creates a frchainS. - */ - newP = (frchainS *) obstack_alloc (&frchains, sizeof (frchainS)); - newP->frch_subseg = subseg; - newP->frch_seg = seg; -#ifdef BFD_ASSEMBLER - newP->fix_root = NULL; - newP->fix_tail = NULL; -#endif - obstack_begin (&newP->frch_obstack, chunksize); -#if __GNUC__ >= 2 - obstack_alignment_mask (&newP->frch_obstack) = __alignof__ (fragS) - 1; -#endif - newP->frch_frag_now = frag_alloc (&newP->frch_obstack); - newP->frch_frag_now->fr_type = rs_fill; - - newP->frch_root = newP->frch_last = newP->frch_frag_now; - - *lastPP = newP; - newP->frch_next = frcP; /* perhaps NULL */ - -#ifdef BFD_ASSEMBLER - { - segment_info_type *seginfo; - seginfo = seg_info (seg); - if (seginfo && seginfo->frchainP == frcP) - seginfo->frchainP = newP; - } -#endif - - frcP = newP; - } - /* - * Here with frcP pointing to the frchainS for subseg. - */ - frchain_now = frcP; - frag_now = frcP->frch_frag_now; - - assert (frchain_now->frch_last == frag_now); -} - -/* - * subseg_set(segT, subsegT) - * - * If you attempt to change to the current subsegment, nothing happens. - * - * In: segT, subsegT code for new subsegment. - * frag_now -> incomplete frag for current subsegment. - * If frag_now==NULL, then there is no old, incomplete frag, so - * the old frag is not closed off. - * - * Out: now_subseg, now_seg updated. - * Frchain_now points to the (possibly new) struct frchain for this - * sub-segment. - * Frchain_root updated if needed. - */ - -#ifndef BFD_ASSEMBLER - -segT -subseg_new (segname, subseg) - const char *segname; - subsegT subseg; -{ - int i; - - for (i = 0; i < (int) SEG_MAXIMUM_ORDINAL; i++) - { - const char *s; - - s = segment_name ((segT) i); - if (strcmp (segname, s) == 0 - || (segname[0] == '.' - && strcmp (segname + 1, s) == 0)) - { - subseg_set ((segT) i, subseg); - return (segT) i; - } -#ifdef obj_segment_name - s = obj_segment_name ((segT) i); - if (strcmp (segname, s) == 0 - || (segname[0] == '.' - && strcmp (segname + 1, s) == 0)) - { - subseg_set ((segT) i, subseg); - return (segT) i; - } -#endif - } - -#ifdef obj_add_segment - { - segT new_seg; - new_seg = obj_add_segment (segname); - subseg_set (new_seg, subseg); - return new_seg; - } -#else - as_bad (_("Attempt to switch to nonexistent segment \"%s\""), segname); - return now_seg; -#endif -} - -void -subseg_set (seg, subseg) /* begin assembly for a new sub-segment */ - register segT seg; /* SEG_DATA or SEG_TEXT */ - register subsegT subseg; -{ -#ifndef MANY_SEGMENTS - know (seg == SEG_DATA - || seg == SEG_TEXT - || seg == SEG_BSS - || seg == SEG_ABSOLUTE); -#endif - - if (seg != now_seg || subseg != now_subseg) - { /* we just changed sub-segments */ - subseg_set_rest (seg, subseg); - } - mri_common_symbol = NULL; -} - -#else /* BFD_ASSEMBLER */ - -segT -subseg_get (segname, force_new) - const char *segname; - int force_new; -{ - segT secptr; - segment_info_type *seginfo; - const char *now_seg_name = (now_seg - ? bfd_get_section_name (stdoutput, now_seg) - : 0); - - if (!force_new - && now_seg_name - && (now_seg_name == segname - || !strcmp (now_seg_name, segname))) - return now_seg; - - if (!force_new) - secptr = bfd_make_section_old_way (stdoutput, segname); - else - secptr = bfd_make_section_anyway (stdoutput, segname); - - seginfo = seg_info (secptr); - if (! seginfo) - { - /* Check whether output_section is set first because secptr may - be bfd_abs_section_ptr. */ - if (secptr->output_section != secptr) - secptr->output_section = secptr; - seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo)); - memset ((PTR) seginfo, 0, sizeof (*seginfo)); - seginfo->fix_root = NULL; - seginfo->fix_tail = NULL; - seginfo->bfd_section = secptr; - if (secptr == bfd_abs_section_ptr) - abs_seg_info = seginfo; - else if (secptr == bfd_und_section_ptr) - und_seg_info = seginfo; - else - bfd_set_section_userdata (stdoutput, secptr, (PTR) seginfo); - seginfo->frchainP = NULL; - seginfo->lineno_list_head = seginfo->lineno_list_tail = NULL; - seginfo->sym = NULL; - seginfo->dot = NULL; - } - return secptr; -} - -segT -subseg_new (segname, subseg) - const char *segname; - subsegT subseg; -{ - segT secptr; - segment_info_type *seginfo; - - secptr = subseg_get (segname, 0); - subseg_set_rest (secptr, subseg); - seginfo = seg_info (secptr); - if (! seginfo->frchainP) - seginfo->frchainP = frchain_now; - return secptr; -} - -/* Like subseg_new, except a new section is always created, even if - a section with that name already exists. */ -segT -subseg_force_new (segname, subseg) - const char *segname; - subsegT subseg; -{ - segT secptr; - segment_info_type *seginfo; - - secptr = subseg_get (segname, 1); - subseg_set_rest (secptr, subseg); - seginfo = seg_info (secptr); - if (! seginfo->frchainP) - seginfo->frchainP = frchain_now; - return secptr; -} - -void -subseg_set (secptr, subseg) - segT secptr; - subsegT subseg; -{ - if (! (secptr == now_seg && subseg == now_subseg)) - subseg_set_rest (secptr, subseg); - mri_common_symbol = NULL; -} - -#ifndef obj_sec_sym_ok_for_reloc -#define obj_sec_sym_ok_for_reloc(SEC) 0 -#endif - -/* Get the gas information we are storing for a section. */ - -segment_info_type * -seg_info (sec) - segT sec; -{ - if (sec == bfd_abs_section_ptr) - return abs_seg_info; - else if (sec == bfd_und_section_ptr) - return und_seg_info; - else - return (segment_info_type *) bfd_get_section_userdata (stdoutput, sec); -} - -symbolS * -section_symbol (sec) - segT sec; -{ - segment_info_type *seginfo = seg_info (sec); - symbolS *s; - - if (seginfo == 0) - abort (); - if (seginfo->sym) - return seginfo->sym; - -#ifndef EMIT_SECTION_SYMBOLS -#define EMIT_SECTION_SYMBOLS 1 -#endif - - if (! EMIT_SECTION_SYMBOLS -#ifdef BFD_ASSEMBLER - || symbol_table_frozen -#endif - ) - { - /* Here we know it won't be going into the symbol table. */ - s = symbol_create (sec->name, sec, 0, &zero_address_frag); - } - else - { - s = symbol_find_base (sec->name, 0); - if (s == NULL) - s = symbol_new (sec->name, sec, 0, &zero_address_frag); - else - { - if (S_GET_SEGMENT (s) == undefined_section) - { - S_SET_SEGMENT (s, sec); - symbol_set_frag (s, &zero_address_frag); - } - } - } - - S_CLEAR_EXTERNAL (s); - - /* Use the BFD section symbol, if possible. */ - if (obj_sec_sym_ok_for_reloc (sec)) - symbol_set_bfdsym (s, sec->symbol); - - seginfo->sym = s; - return s; -} - -#endif /* BFD_ASSEMBLER */ - -void -subsegs_print_statistics (file) - FILE *file; -{ - frchainS *frchp; - fprintf (file, "frag chains:\n"); - for (frchp = frchain_root; frchp; frchp = frchp->frch_next) - { - int count = 0; - fragS *fragp; - - /* If frch_subseg is non-zero, it's probably been chained onto - the end of a previous subsection. Don't count it again. */ - if (frchp->frch_subseg != 0) - continue; - - /* Skip gas-internal sections. */ - if (segment_name (frchp->frch_seg)[0] == '*') - continue; - - for (fragp = frchp->frch_root; fragp; fragp = fragp->fr_next) - { -#if 0 - switch (fragp->fr_type) - { - case rs_fill: - fprintf (file, "f"); break; - case rs_align: - fprintf (file, "a"); break; - case rs_align_code: - fprintf (file, "c"); break; - case rs_org: - fprintf (file, "o"); break; - case rs_machine_dependent: - fprintf (file, "m"); break; - case rs_space: - fprintf (file, "s"); break; - case 0: - fprintf (file, "0"); break; - default: - fprintf (file, "?"); break; - } -#endif - count++; - } - fprintf (file, "\n"); - fprintf (file, "\t%p %-10s\t%10d frags\n", frchp, - segment_name (frchp->frch_seg), count); - } -} - -/* end of subsegs.c */ |