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PR 997

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* frags.c (frag_offset_fixed_p): New function.
	* frags.h (frag_offset_fixed_p): Declare.
	* expr.c (expr): Use frag_offset_fixed_p when simplifying subtraction.
	(resolve_expression): Likewise.
This commit is contained in:
Alan Modra
2006-04-04 08:04:57 +00:00
parent bb3af66b41
commit 9963077898
4 changed files with 77 additions and 7 deletions
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54
gas/frags.c
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@ -1,6 +1,6 @@
/* frags.c - manage frags -
Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
1999, 2000, 2001, 2003, 2004
1999, 2000, 2001, 2003, 2004, 2005, 2006
Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
@ -383,3 +383,55 @@ frag_append_1_char (int datum)
}
obstack_1grow (&frchain_now->frch_obstack, datum);
}
/* Return TRUE if FRAG1 and FRAG2 have a fixed relationship between
their start addresses. Set OFFSET to the difference in address
not already accounted for in the frag FR_ADDRESS. */
bfd_boolean
frag_offset_fixed_p (fragS *frag1, fragS *frag2, bfd_vma *offset)
{
fragS *frag;
bfd_vma off;
/* Start with offset initialised to difference between the two frags.
Prior to assigning frag addresses this will be zero. */
off = frag1->fr_address - frag2->fr_address;
if (frag1 == frag2)
{
*offset = off;
return TRUE;
}
/* Maybe frag2 is after frag1. */
frag = frag1;
while (frag->fr_type == rs_fill)
{
off += frag->fr_fix + frag->fr_offset * frag->fr_var;
frag = frag->fr_next;
if (frag == NULL)
break;
if (frag == frag2)
{
*offset = off;
return TRUE;
}
}
/* Maybe frag1 is after frag2. */
frag = frag2;
while (frag->fr_type == rs_fill)
{
off -= frag->fr_fix + frag->fr_offset * frag->fr_var;
frag = frag->fr_next;
if (frag == NULL)
break;
if (frag == frag1)
{
*offset = off;
return TRUE;
}
}
return FALSE;
}