/* 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, 2007
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)
+ the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
(void) obstack_alloc (ob, 0);
oalign = obstack_alignment_mask (ob);
obstack_alignment_mask (ob) = 0;
- ptr = (fragS *) obstack_alloc (ob, SIZEOF_STRUCT_FRAG);
+ ptr = obstack_alloc (ob, SIZEOF_STRUCT_FRAG);
obstack_alignment_mask (ob) = oalign;
memset (ptr, 0, SIZEOF_STRUCT_FRAG);
return ptr;
frag_wane (frag_now);
frag_new (0);
oldc = frchain_now->frch_obstack.chunk_size;
- frchain_now->frch_obstack.chunk_size = 2 * nchars + SIZEOF_STRUCT_FRAG;
+ /* Try to allocate a bit more than needed right now. But don't do
+ this if we would waste too much memory. Especially necessary
+ for extremely big (like 2GB initialized) frags. */
+ if (nchars < 0x10000)
+ frchain_now->frch_obstack.chunk_size = 2 * nchars;
+ else
+ frchain_now->frch_obstack.chunk_size = nchars + 0x10000;
+ frchain_now->frch_obstack.chunk_size += SIZEOF_STRUCT_FRAG;
if (frchain_now->frch_obstack.chunk_size > 0)
while ((n = obstack_room (&frchain_now->frch_obstack)) < nchars
&& (unsigned long) frchain_now->frch_obstack.chunk_size > nchars)
}
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 (const fragS *frag1, const fragS *frag2, bfd_vma *offset)
+{
+ const 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. */
+ off = frag1->fr_address - frag2->fr_address;
+ 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;
+}