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dw-cfa-advance-loc.diff
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File dw-cfa-advance-loc.diff of Package libbfd_2_19
2008-11-19 Jakub Jelinek <jakub@redhat.com> * Makefile.am (ehopt.o): Add struc-symbol.h. * Makefile.in: Regenerated. * ehopt.c: Include struc-symbol.h. (check_eh_frame): For very small O_constant DW_CFA_advance_loc4 create correct DW_CFA_advance_loc. Handle O_subtract only for code alignment factor 1, otherwise handle O_divide or O_right_shift of O_subtract and O_constant. (eh_frame_estimate_size_before_relax): Always divide by ca. (eh_frame_convert_frag): Likewise. 2008-11-18 John David Anglin <dave.anglin@nrc-cnrc.gc.ca> * dw2gencfi.c (output_cfi_insn): Scale DW_CFA_advance_loc1, DW_CFA_advance_loc2 and DW_CFA_advance_loc4 outputs. --- gas/Makefile.am.jj 2008-11-19 15:50:40.000000000 +0100 +++ gas/Makefile.am 2008-11-19 16:57:49.000000000 +0100 @@ -2159,7 +2159,8 @@ dwarf2dbg.o: dwarf2dbg.c $(INCDIR)/safe- dw2gencfi.o: dw2gencfi.c dw2gencfi.h $(INCDIR)/elf/dwarf2.h \ subsegs.h $(INCDIR)/obstack.h ecoff.o: ecoff.c ecoff.h -ehopt.o: ehopt.c subsegs.h $(INCDIR)/obstack.h $(INCDIR)/elf/dwarf2.h +ehopt.o: ehopt.c subsegs.h $(INCDIR)/obstack.h $(INCDIR)/elf/dwarf2.h \ + struc-symbol.h expr.o: expr.c $(INCDIR)/safe-ctype.h $(INCDIR)/obstack.h flonum-copy.o: flonum-copy.c flonum-konst.o: flonum-konst.c --- gas/Makefile.in.jj 2008-11-19 15:50:40.000000000 +0100 +++ gas/Makefile.in 2008-11-19 16:58:03.000000000 +0100 @@ -3015,7 +3015,8 @@ dwarf2dbg.o: dwarf2dbg.c $(INCDIR)/safe- dw2gencfi.o: dw2gencfi.c dw2gencfi.h $(INCDIR)/elf/dwarf2.h \ subsegs.h $(INCDIR)/obstack.h ecoff.o: ecoff.c ecoff.h -ehopt.o: ehopt.c subsegs.h $(INCDIR)/obstack.h $(INCDIR)/elf/dwarf2.h +ehopt.o: ehopt.c subsegs.h $(INCDIR)/obstack.h $(INCDIR)/elf/dwarf2.h \ + struc-symbol.h expr.o: expr.c $(INCDIR)/safe-ctype.h $(INCDIR)/obstack.h flonum-copy.o: flonum-copy.c flonum-konst.o: flonum-konst.c --- gas/dw2gencfi.c 9 Oct 2008 17:31:43 -0000 1.39 +++ gas/dw2gencfi.c 18 Nov 2008 02:50:24 -0000 @@ -972,20 +972,20 @@ output_cfi_insn (struct cfi_insn_data *i if (scaled <= 0x3F) out_one (DW_CFA_advance_loc + scaled); - else if (delta <= 0xFF) + else if (scaled <= 0xFF) { out_one (DW_CFA_advance_loc1); - out_one (delta); + out_one (scaled); } - else if (delta <= 0xFFFF) + else if (scaled <= 0xFFFF) { out_one (DW_CFA_advance_loc2); - out_two (delta); + out_two (scaled); } else { out_one (DW_CFA_advance_loc4); - out_four (delta); + out_four (scaled); } } else --- gas/ehopt.c.jj 2007-12-28 09:31:47.000000000 +0100 +++ gas/ehopt.c 2008-11-19 17:03:48.000000000 +0100 @@ -1,5 +1,6 @@ /* ehopt.c--optimize gcc exception frame information. - Copyright 1998, 2000, 2001, 2003, 2005, 2007 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. @@ -21,6 +22,7 @@ #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 @@ -398,13 +400,10 @@ check_eh_frame (expressionS *exp, unsign 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; } @@ -419,23 +418,39 @@ check_eh_frame (expressionS *exp, unsign *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) + == 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: @@ -459,7 +474,9 @@ eh_frame_estimate_size_before_relax (fra 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; @@ -496,21 +513,21 @@ eh_frame_convert_frag (fragS *frag) { 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:
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