/* frags.c - manage frags -
- Copyright (C) 1987, 1990, 1991 Free Software Foundation, Inc.
-
+
+ Copyright (C) 1987, 1990, 1991, 1992 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
+ the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "as.h"
#include "subsegs.h"
#include "obstack.h"
-struct obstack frags; /* All, and only, frags live here. */
+struct obstack frags; /* All, and only, frags live here. */
-fragS zero_address_frag = {
- 0, /* fr_address */
- NULL, /* fr_next */
- 0, /* fr_fix */
- 0, /* fr_var */
- 0, /* fr_symbol */
- 0, /* fr_offset */
- NULL, /* fr_opcode */
- rs_fill, /* fr_type */
- 0, /* fr_subtype */
- 0, /* fr_pcrel_adjust */
- 0, /* fr_bsr */
- 0 /* fr_literal [0] */
- };
-
-fragS bss_address_frag = {
- 0, /* fr_address. Gets filled in to make up
- sy_value-s. */
- NULL, /* fr_next */
- 0, /* fr_fix */
- 0, /* fr_var */
- 0, /* fr_symbol */
- 0, /* fr_offset */
- NULL, /* fr_opcode */
- rs_fill, /* fr_type */
- 0, /* fr_subtype */
- 0, /* fr_pcrel_adjust */
- 0, /* fr_bsr */
- 0 /* fr_literal [0] */
- };
+extern fragS zero_address_frag;
+extern fragS bss_address_frag;
+\f
+/* Initialization for frag routines. */
+void
+frag_init ()
+{
+ zero_address_frag.fr_type = rs_fill;
+ bss_address_frag.fr_type = rs_fill;
+ obstack_begin (&frags, 5000);
+}
\f
/*
* frag_grow()
*
- * Internal.
* Try to augment current frag by nchars chars.
* If there is no room, close of the current frag with a ".fill 0"
* and begin a new frag. Unless the new frag has nchars chars available
* do not return. Do not set up any fields of *now_frag.
*/
-static void frag_grow(nchars)
-unsigned int nchars;
+void
+frag_grow (nchars)
+ unsigned int nchars;
{
- if (obstack_room (&frags) < nchars) {
- unsigned int n,oldn;
- long oldc;
-
- frag_wane(frag_now);
- frag_new(0);
- oldn=(unsigned)-1;
- oldc=frags.chunk_size;
- frags.chunk_size=2*nchars;
- while((n=obstack_room(&frags))<nchars && n<oldn) {
- frag_wane(frag_now);
- frag_new(0);
- oldn=n;
- }
- frags.chunk_size=oldc;
+ if (obstack_room (&frags) < nchars)
+ {
+ unsigned int n, oldn;
+ long oldc;
+
+ frag_wane (frag_now);
+ frag_new (0);
+ oldn = (unsigned) -1;
+ oldc = frags.chunk_size;
+ frags.chunk_size = 2 * nchars;
+ while ((n = obstack_room (&frags)) < nchars && n < oldn)
+ {
+ frag_wane (frag_now);
+ frag_new (0);
+ oldn = n;
}
- if (obstack_room (&frags) < nchars)
- as_fatal("Can't extend frag %d. chars", nchars);
-} /* frag_grow() */
+ frags.chunk_size = oldc;
+ }
+ if (obstack_room (&frags) < nchars)
+ as_fatal ("Can't extend frag %d. chars", nchars);
+} /* frag_grow() */
\f
/*
* frag_new()
* Make a new frag, initialising some components. Link new frag at end
* of frchain_now.
*/
-void frag_new(old_frags_var_max_size)
-int old_frags_var_max_size; /* Number of chars (already allocated on
+void
+frag_new (old_frags_var_max_size)
+ int old_frags_var_max_size;/* Number of chars (already allocated on
obstack frags) */
-/* in variable_length part of frag. */
+ /* in variable_length part of frag. */
{
- register fragS * former_last_fragP;
- /* char *throw_away_pointer; JF unused */
- register frchainS * frchP;
- long tmp; /* JF */
-
- frag_now->fr_fix = (char *) (obstack_next_free (&frags)) -
- (frag_now->fr_literal) - old_frags_var_max_size;
- /* Fix up old frag's fr_fix. */
-
- obstack_finish (&frags);
- /* This will align the obstack so the */
- /* next struct we allocate on it will */
- /* begin at a correct boundary. */
- frchP = frchain_now;
- know (frchP);
- former_last_fragP = frchP->frch_last;
- know (former_last_fragP);
- know (former_last_fragP == frag_now);
- obstack_blank (&frags, SIZEOF_STRUCT_FRAG);
- /* We expect this will begin at a correct */
- /* boundary for a struct. */
- tmp=obstack_alignment_mask(&frags);
- obstack_alignment_mask(&frags)=0; /* Turn off alignment */
- /* If we ever hit a machine
- where strings must be
- aligned, we Lose Big */
- frag_now=(fragS *)obstack_finish(&frags);
- obstack_alignment_mask(&frags)=tmp; /* Restore alignment */
-
- /* Just in case we don't get zero'd bytes */
- bzero(frag_now, SIZEOF_STRUCT_FRAG);
-
- /* obstack_unaligned_done (&frags, &frag_now); */
- /* know (frags.obstack_c_next_free == frag_now->fr_literal); */
- /* Generally, frag_now->points to an */
- /* address rounded up to next alignment. */
- /* However, characters will add to obstack */
- /* frags IMMEDIATELY after the struct frag, */
- /* even if they are not starting at an */
- /* alignment address. */
- former_last_fragP->fr_next = frag_now;
- frchP->frch_last = frag_now;
-
+ register fragS *former_last_fragP;
+ register frchainS *frchP;
+ long tmp;
+
+ frag_now->fr_fix = frag_now_fix () - old_frags_var_max_size;
+ /* Fix up old frag's fr_fix. */
+
+ obstack_finish (&frags);
+ /* This will align the obstack so the next struct we allocate on it
+ will begin at a correct boundary. */
+ frchP = frchain_now;
+ know (frchP);
+ former_last_fragP = frchP->frch_last;
+ know (former_last_fragP);
+ know (former_last_fragP == frag_now);
+ obstack_blank (&frags, SIZEOF_STRUCT_FRAG);
+ /* We expect this will begin at a correct boundary for a struct. */
+ tmp = obstack_alignment_mask (&frags);
+ obstack_alignment_mask (&frags) = 0; /* Turn off alignment */
+ /* If we ever hit a machine where strings must be aligned, we Lose
+ Big. */
+ frag_now = (fragS *) obstack_finish (&frags);
+ obstack_alignment_mask (&frags) = tmp; /* Restore alignment */
+
+ /* Just in case we don't get zero'd bytes */
+ memset (frag_now, '\0', SIZEOF_STRUCT_FRAG);
+
+ /* Generally, frag_now->points to an address rounded up to next
+ alignment. However, characters will add to obstack frags
+ IMMEDIATELY after the struct frag, even if they are not starting
+ at an alignment address. */
+ former_last_fragP->fr_next = frag_now;
+ frchP->frch_last = frag_now;
+
#ifndef NO_LISTING
- {
- extern struct list_info_struct *listing_tail;
- frag_now->line = listing_tail;
- }
+ {
+ extern struct list_info_struct *listing_tail;
+ frag_now->line = listing_tail;
+ }
#endif
-
- frag_now->fr_next = NULL;
+
+ frag_now->fr_next = NULL;
} /* frag_new() */
\f
/*
* frag_now_growth past the new chars.
*/
-char *frag_more (nchars)
-int nchars;
+char *
+frag_more (nchars)
+ int nchars;
{
- register char *retval;
-
- frag_grow (nchars);
- retval = obstack_next_free (&frags);
- obstack_blank_fast (&frags, nchars);
- return (retval);
+ register char *retval;
+
+ if (now_seg == absolute_section)
+ {
+ as_bad ("attempt to allocate data in absolute section");
+ subseg_set (text_section, 0);
+ }
+
+ if (mri_common_symbol != NULL)
+ {
+ as_bad ("attempt to allocate data in common section");
+ mri_common_symbol = NULL;
+ }
+
+ frag_grow (nchars);
+ retval = obstack_next_free (&frags);
+ obstack_blank_fast (&frags, nchars);
+ return (retval);
} /* frag_more() */
\f
/*
* to write into.
*/
-char *frag_var(type, max_chars, var, subtype, symbol, offset, opcode)
-relax_stateT type;
-int max_chars;
-int var;
-relax_substateT subtype;
-symbolS *symbol;
-long offset;
-char *opcode;
+char *
+frag_var (type, max_chars, var, subtype, symbol, offset, opcode)
+ relax_stateT type;
+ int max_chars;
+ int var;
+ relax_substateT subtype;
+ symbolS *symbol;
+ long offset;
+ char *opcode;
{
- register char *retval;
-
- frag_grow (max_chars);
- retval = obstack_next_free (&frags);
- obstack_blank_fast (&frags, max_chars);
- frag_now->fr_var = var;
- frag_now->fr_type = type;
- frag_now->fr_subtype = subtype;
- frag_now->fr_symbol = symbol;
- frag_now->fr_offset = offset;
- frag_now->fr_opcode = opcode;
- /* default these to zero. */
- frag_now->fr_pcrel_adjust = 0;
- frag_now->fr_bsr = 0;
- frag_new (max_chars);
- return (retval);
-} /* frag_var() */
+ register char *retval;
+
+ frag_grow (max_chars);
+ retval = obstack_next_free (&frags);
+ obstack_blank_fast (&frags, max_chars);
+ frag_now->fr_var = var;
+ frag_now->fr_type = type;
+ frag_now->fr_subtype = subtype;
+ frag_now->fr_symbol = symbol;
+ frag_now->fr_offset = offset;
+ frag_now->fr_opcode = opcode;
+ /* default these to zero. */
+ frag_now->fr_pcrel_adjust = 0;
+ frag_now->fr_bsr = 0;
+ frag_new (max_chars);
+ return (retval);
+}
\f
/*
* frag_variant()
* Two new arguments have been added.
*/
-char *frag_variant(type, max_chars, var, subtype, symbol, offset, opcode, pcrel_adjust,bsr)
-relax_stateT type;
-int max_chars;
-int var;
-relax_substateT subtype;
-symbolS *symbol;
-long offset;
-char *opcode;
-int pcrel_adjust;
-char bsr;
+char *
+frag_variant (type, max_chars, var, subtype, symbol, offset, opcode)
+ relax_stateT type;
+ int max_chars;
+ int var;
+ relax_substateT subtype;
+ symbolS *symbol;
+ long offset;
+ char *opcode;
{
- register char *retval;
-
- /* frag_grow (max_chars); */
- retval = obstack_next_free (&frags);
- /* obstack_blank_fast (&frags, max_chars); */ /* OVE: so far the only diff */
- frag_now->fr_var = var;
- frag_now->fr_type = type;
- frag_now->fr_subtype = subtype;
- frag_now->fr_symbol = symbol;
- frag_now->fr_offset = offset;
- frag_now->fr_opcode = opcode;
- frag_now->fr_pcrel_adjust = pcrel_adjust;
- frag_now->fr_bsr = bsr;
- frag_new (max_chars);
- return (retval);
+ register char *retval;
+
+ retval = obstack_next_free (&frags);
+ frag_now->fr_var = var;
+ frag_now->fr_type = type;
+ frag_now->fr_subtype = subtype;
+ frag_now->fr_symbol = symbol;
+ frag_now->fr_offset = offset;
+ frag_now->fr_opcode = opcode;
+ frag_now->fr_pcrel_adjust = 0;
+ frag_now->fr_bsr = 0;
+ frag_new (max_chars);
+ return (retval);
} /* frag_variant() */
\f
/*
*
* Reduce the variable end of a frag to a harmless state.
*/
-void frag_wane(fragP)
-register fragS * fragP;
+void
+frag_wane (fragP)
+ register fragS *fragP;
{
- fragP->fr_type = rs_fill;
- fragP->fr_offset = 0;
- fragP->fr_var = 0;
+ fragP->fr_type = rs_fill;
+ fragP->fr_offset = 0;
+ fragP->fr_var = 0;
}
\f
/*
* (so far empty) frag, in the same subsegment as the last frag.
*/
-void frag_align(alignment, fill_character)
-int alignment;
-int fill_character;
+void
+frag_align (alignment, fill_character)
+ int alignment;
+ int fill_character;
{
- *(frag_var (rs_align, 1, 1, (relax_substateT)0, (symbolS *)0,
- (long)alignment, (char *)0)) = fill_character;
-} /* frag_align() */
+ char *p;
+ p = frag_var (rs_align, 1, 1, (relax_substateT) 0,
+ (symbolS *) 0, (long) alignment, (char *) 0);
+ *p = fill_character;
+}
+
+void
+frag_align_pattern (alignment, fill_pattern, n_fill)
+ int alignment;
+ const char *fill_pattern;
+ int n_fill;
+{
+ char *p;
+ p = frag_var (rs_align, n_fill, n_fill, (relax_substateT) 0,
+ (symbolS *) 0, (long) alignment, (char *) 0);
+ memcpy (p, fill_pattern, n_fill);
+}
+
+int
+frag_now_fix ()
+{
+ if (now_seg == absolute_section)
+ return abs_section_offset;
+ return (char*)obstack_next_free (&frags) - frag_now->fr_literal;
+}
+
+void
+frag_append_1_char (datum)
+ int datum;
+{
+ if (obstack_room (&frags) <= 1)
+ {
+ frag_wane (frag_now);
+ frag_new (0);
+ }
+ obstack_1grow (&frags, datum);
+}
-/* end: frags.c */
+/* end of frags.c */
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