/* ehopt.c--optimize gcc exception frame information.
- Copyright 1998, 2000, 2001, 2003 Free Software Foundation, Inc.
+ Copyright 1998, 2000, 2001, 2003, 2005, 2007, 2008
+ Free Software Foundation, Inc.
Written by Ian Lance Taylor <ian@cygnus.com>.
-This file is part of GAS, the GNU Assembler.
+ 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 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 3, 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.
+ 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. */
+ 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, 51 Franklin Street - Fifth Floor, Boston, MA
+ 02110-1301, USA. */
#include "as.h"
#include "subsegs.h"
+#include "struc-symbol.h"
/* We include this ELF file, even though we may not be assembling for
ELF, since the exception frame information is always in a format
/* We should find the CIE at the start of the section. */
-#if defined (BFD_ASSEMBLER) || defined (MANY_SEGMENTS)
f = seg_info (now_seg)->frchainP->frch_root;
-#else
- f = frchain_now->frch_root;
-#endif
-#ifdef BFD_ASSEMBLER
fix = seg_info (now_seg)->frchainP->fix_root;
-#else
- fix = *seg_fix_rootP;
-#endif
/* Look through the frags of the section to find the code alignment. */
if (flag_traditional_format)
return 0;
+#ifdef md_allow_eh_opt
+ if (! md_allow_eh_opt)
+ return 0;
+#endif
+
/* Select the proper section data. */
if (strcmp (segment_name (now_seg), ".eh_frame") == 0)
d = &eh_frame_data;
subtracted were in the same frag and the expression was
reduced to a constant. We can do the optimization entirely
in this function. */
- if (d->cie_info.code_alignment > 0
- && exp->X_add_number % d->cie_info.code_alignment == 0
- && exp->X_add_number / d->cie_info.code_alignment < 0x40)
+ if (exp->X_add_number < 0x40)
{
d->loc4_frag->fr_literal[d->loc4_fix]
- = DW_CFA_advance_loc
- | (exp->X_add_number / d->cie_info.code_alignment);
+ = DW_CFA_advance_loc | exp->X_add_number;
/* No more bytes needed. */
return 1;
}
*pnbytes = 2;
}
}
- else if (exp->X_op == O_subtract)
+ else if (exp->X_op == O_subtract && d->cie_info.code_alignment == 1)
{
/* This is a case we can optimize. The expression was not
reduced, so we can not finish the optimization until the end
of the assembly. We set up a variant frag which we handle
later. */
- int fr_subtype;
-
- if (d->cie_info.code_alignment > 0)
- fr_subtype = d->cie_info.code_alignment << 3;
- else
- fr_subtype = 0;
-
- frag_var (rs_cfa, 4, 0, fr_subtype, make_expr_symbol (exp),
+ frag_var (rs_cfa, 4, 0, 1 << 3, make_expr_symbol (exp),
d->loc4_fix, (char *) d->loc4_frag);
return 1;
}
+ else if ((exp->X_op == O_divide
+ || exp->X_op == O_right_shift)
+ && d->cie_info.code_alignment > 1)
+ {
+ if (exp->X_add_symbol->bsym
+ && exp->X_op_symbol->bsym
+ && exp->X_add_symbol->sy_value.X_op == O_subtract
+ && exp->X_op_symbol->sy_value.X_op == O_constant
+ && ((exp->X_op == O_divide
+ ? exp->X_op_symbol->sy_value.X_add_number
+ : (offsetT) 1 << exp->X_op_symbol->sy_value.X_add_number)
+ == (offsetT) d->cie_info.code_alignment))
+ {
+ /* This is a case we can optimize as well. The expression was
+ not reduced, so we can not finish the optimization until the
+ end of the assembly. We set up a variant frag which we
+ handle later. */
+ frag_var (rs_cfa, 4, 0, d->cie_info.code_alignment << 3,
+ make_expr_symbol (&exp->X_add_symbol->sy_value),
+ d->loc4_fix, (char *) d->loc4_frag);
+ return 1;
+ }
+ }
break;
case state_error:
diff = resolve_symbol_value (frag->fr_symbol);
- if (ca > 0 && diff % ca == 0 && diff / ca < 0x40)
+ assert (ca > 0);
+ diff /= ca;
+ if (diff < 0x40)
ret = 0;
else if (diff < 0x100)
ret = 1;
{
offsetT diff;
fragS *loc4_frag;
- int loc4_fix;
+ int loc4_fix, ca;
loc4_frag = (fragS *) frag->fr_opcode;
loc4_fix = (int) frag->fr_offset;
diff = resolve_symbol_value (frag->fr_symbol);
+ ca = frag->fr_subtype >> 3;
+ assert (ca > 0);
+ diff /= ca;
switch (frag->fr_subtype & 7)
{
case 0:
- {
- int ca = frag->fr_subtype >> 3;
- assert (ca > 0 && diff % ca == 0 && diff / ca < 0x40);
- loc4_frag->fr_literal[loc4_fix] = DW_CFA_advance_loc | (diff / ca);
- }
+ assert (diff < 0x40);
+ loc4_frag->fr_literal[loc4_fix] = DW_CFA_advance_loc | diff;
break;
case 1:
projects / binutils-gdb.git / blobdiff