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Commit f0e0a108 authored by simonmar's avatar simonmar
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[project @ 2002-03-26 10:27:35 by simonmar] 

Changes to support powerpc-apple-macosx.

From Wolfgang Thaller <wolfgang.thaller@gmx.net>.
parent f8fa9e37
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ghc/driver/mangler/ghc-asm.lprl
View file @ f0e0a108
......@@ -269,32 +269,32 @@ sub init_TARGET_STUFF {
$T_create_word = "\t.word";
#--------------------------------------------------------#
} elsif ( $TargetPlatform =~ /^powerpc-.*|^rs6000-.*/ ) {
} elsif ( $TargetPlatform =~ /^powerpc-apple-.*/ ) {
# Apple PowerPC Darwin/MacOS X.
$T_STABBY = 0; # 1 iff .stab things (usually if a.out format)
$T_US = ''; # _ if symbols have an underscore on the front
$T_PRE_APP = 'NOT APPLICABLE'; # regexp that says what comes before APP/NO_APP
$T_CONST_LBL = 'NOT APPLICABLE'; # regexp for what such a lbl looks like
$T_US = '_'; # _ if symbols have an underscore on the front
$T_PRE_APP = 'WHAT IS THIS'; # regexp that says what comes before APP/NO_APP
$T_CONST_LBL = '^\LC\d+:'; # regexp for what such a lbl looks like
$T_POST_LBL = ':';
$T_MOVE_DIRVS = '^(\s*(\.toc|\.align \d+|\.csect \S+|\t\.?l?globl \S+)\n)';
$T_COPY_DIRVS = '\.(l?globl)';
$T_MOVE_DIRVS = '^(\s*(\.align \d+|\.text|\.data|\.cstring|\.non_lazy_symbol_pointer|\.const|\.static_const|\.literal4|\.literal8|\.static_data|\.globl \S+)\n)';
$T_COPY_DIRVS = '\.(globl)';
$T_hsc_cc_PAT = '\.byte.*\)(hsc|cc) (.*)"\n\t\.byte \d+\n\t\.byte "(.*)"\n\t\.byte \d+';
$T_DOT_WORD = '\.long';
$T_DOT_WORD = '\.(long|short|byte)';
$T_DOT_GLOBAL = '\.globl';
$T_HDR_toc = "\.toc\n";
$T_HDR_literal = "\.csect .data[RW]\n\t\.align 2\n"; #not RO!?
$T_HDR_misc = "# misc\n\.csect \.text[PR]\n\t\.align 2\n";
$T_HDR_data = "# data\n\.csect \.data[RW]\n\t\.align 2\n";
$T_HDR_consist = "# consist\n\.csect \.data[RW]\n\t\.align 2\n";
$T_HDR_closure = "# closure\n\.csect \.data[RW]\n\t\.align 2\n";
$T_HDR_srt = "# closure\n\.csect \.data[RW]\n\t\.align 2\n";
$T_HDR_info = "# info\n\.csect \.data[RW]\n\t\.align 2\n"; #not RO!?
$T_HDR_entry = "# entry\n\.csect \.text[PR]\n\t\.align 2\n";
$T_HDR_fast = "# fast\n\.csect \.text[PR]\n\t\.align 2\n";
$T_HDR_vector = "# vector\n\.csect \.data[RW]\n\t\.align 2\n"; #not RO!?
$T_HDR_direct = "# direct\n";
$T_HDR_literal = "\t\.const_data\n\t\.align 2\n";
$T_HDR_misc = "\t\.text\n\t\.align 2\n";
$T_HDR_data = "\t\.data\n\t\.align 2\n";
$T_HDR_consist = "\t\.text\n\t\.align 2\n";
$T_HDR_closure = "\t\.const_data\n\t\.align 2\n";
$T_HDR_srt = "\t\.text\n\t\.align 2\n";
$T_HDR_info = "\t\.text\n\t\.align 2\n";
$T_HDR_entry = "\t\.text\n\t\.align 2\n";
$T_HDR_fast = "\t\.text\n\t\.align 2\n";
$T_HDR_vector = "\t\.text\n\t\.align 2\n";
$T_HDR_direct = "\t\.text\n\t\.align 2\n";
$T_create_word = "\t.long";
#--------------------------------------------------------#
......@@ -437,9 +437,7 @@ sub mangle_asm {
next if /${T_PRE_APP}(NO_)?APP/o;
next if /^;/ && $TargetPlatform =~ /^hppa/;
next if /(^$|^\t\.file\t|^ # )/ && $TargetPlatform =~ /^(mips|powerpc|rs6000)-/;
last if /^_section_\.text:$/ && $TargetPlatform =~ /^powerpc-|^rs6000-/;
next if /(^$|^\t\.file\t|^ # )/ && $TargetPlatform =~ /^(mips)-/;
if ( $TargetPlatform =~ /^mips-/
&& /^\t\.(globl\S+\.text|comm\t)/ ) {
......@@ -543,11 +541,6 @@ sub mangle_asm {
$chkcat[$i] = 'bss';
$chksymb[$i] = '';
} elsif ( $TargetPlatform =~ /^powerpc-|^rs6000-/ && /^LC\.\.([0-9]+)/ ) {
$chk[++$i] = $_;
$chkcat[$i] = 'toc';
$chksymb[$i] = $1;
} elsif ( /^${T_US}([A-Za-z0-9_]+)_cc(s)?${T_POST_LBL}$/o ) {
# all CC_ symbols go in the data section...
$chk[++$i] = $_;
......@@ -558,9 +551,6 @@ sub mangle_asm {
$chk[++$i] = $_;
$chkcat[$i] = 'misc';
$chksymb[$i] = '';
#$symbtmp = $1;
#$chksymb[$i] = $symbtmp if ($TargetPlatform =~ /^powerpc-|^rs6000-/) ; #rm andre
} elsif ( /^${T_US}([A-Za-z0-9_]+)_vtbl${T_POST_LBL}$/o ) {
$chk[++$i] = $_;
$chkcat[$i] = 'vector';
......@@ -592,9 +582,7 @@ sub mangle_asm {
} elsif ( /^${T_US}[A-Za-z0-9_]/o
&& ( $TargetPlatform !~ /^hppa/ # need to avoid local labels in this case
|| ! /^L\$\d+$/ )
&& ( $TargetPlatform !~ /^powerpc|^rs6000/ # ditto
|| ! /^(L\.\.\d+|LT\.\..*):$/ ) ) {
|| ! /^L\$\d+$/ ) ) {
local($thing);
chop($thing = $_);
print STDERR "Funny global thing?: $_"
......@@ -608,9 +596,7 @@ sub mangle_asm {
|| /^_uname:/o; # x86/Solaris2
$chk[++$i] = $_;
$chkcat[$i] = 'misc';
if ($TargetPlatform =~ /^powerpc-|^rs6000-/)
{ $chksymb[$i] = $thing; }
else { $chksymb[$i] = ''; };
$chksymb[$i] = '';
} else { # simple line (duplicated at the top)
......@@ -619,9 +605,11 @@ sub mangle_asm {
}
$numchks = $#chk + 1;
# open CHUNKS, ">/tmp/chunks1" or die "Cannot open /tmp/chunks1: $!\n";
# for (my $i = 0; $i < @chk; ++$i) { print CHUNKS "======= $i =======\n", $chk[$i] }
# close CHUNKS;
open CHUNKS, ">/tmp/chunks1" or die "Cannot open /tmp/chunks1: $!\n";
for (my $i = 0; $i < @chk; ++$i) { print CHUNKS "======= $i =======\n", $chk[$i] }
close CHUNKS;
# ########
# the division into chunks is imperfect;
# we throw some things over the fence into the next
......@@ -644,37 +632,6 @@ sub mangle_asm {
# HPPAs, MIPSen: also start medding at chunk 1
if ($TargetPlatform =~ /^powerpc|^rs6000/) {
print OUTASM $T_HDR_toc; # yes, we have to put a .toc
# in the beginning of every file!
%tocequiv = (); # maps toc symbol number to toc symbol
%revtocequiv = (); # maps toc symbol to toc symbol number
for ($i = 1; $i < $numchks; $i++) {
$chk[$i] =~ s/\[RW\]//g;
$chk[$i] =~ s/\[DS\]//g;
$chk[$i] =~ s/^\.csect .*\[DS\]$//g;
if ( $chkcat[$i] eq 'toc' && $chk[$i] !~ /\.byte/ )
#ToDo: instead of all these changes, just fix mangle_powerpc_tailjump and delete/ignore these tocs?
{ $chk[$i] =~ s/$T_MOVE_DIRVS//g;
$chk[$i] =~ s/\t\.tc (\S+)\[TC\],(\S+_fast\d+)/\t\.tc \1\[TC\],\.\2/;
$chk[$i] =~ s/\t\.tc (\S+)\[TC\],(\S+_entry)\n/\t\.tc \1\[TC\],\.\2\n/;
$chk[$i] =~ s/\t\.tc (\S+)\[TC\],(ret_\S+)/\t\.tc \1\[TC\],\.\2/;
$chk[$i] =~ s/\t\.tc (\S+)\[TC\],(alt_\S+)/\t\.tc \1\[TC\],\.\2/;
$chk[$i] =~ s/\t\.tc (\S+)\[TC\],(vtbl_\S+)/\t\.tc \1\[TC\],\.\2/;
$tocnumber = $chksymb[$i];
$tocsymb = $chk[$i];
$tocsymb =~ s/^LC\.\.\d+:\n//;
$tocsymb =~ s/^\t\.tc \S+,(\S+)\n/\1/;
$tocequiv{$tocnumber} = $tocsymb;
} elsif ( $chkcat[$i] eq 'toc' && $chk[$i] =~ /\.byte/ ) {
$chkcat[$i] = 'literal';
}
}
};
for ($i = $FIRST_TOSSABLE; $i < $numchks; $i++) {
$c = $chk[$i]; # convenience copy
......@@ -718,25 +675,31 @@ sub mangle_asm {
$p =~ s/^\tsw\t\$fp,\d+\(\$sp\)\n//;
$p =~ s/^\tsw\t\$28,\d+\(\$sp\)\n//;
$p =~ s/__FRAME__/$FRAME/;
} elsif ($TargetPlatform =~ /^powerpc-|^rs6000/) {
$p =~ s/^\tmflr 0\n//;
$p =~ s/^\tstm \d+,-\d+\(1\)\n//;
$p =~ s/^\tstw? 0,\d+\(1\)\n//g;
$p =~ s/^\tstw? 1,\d+\(1\)\n//g; #mc
$p =~ s/^\tlw?z 0,0\(1\)\n//g; #mc
$p =~ s/^\tstw?u 1,-\d+\(1\)\n//;
$p =~ s/^\tstw? \d+,-\d+\(1\)\n//g;
$p =~ s/^\tstfd \d+,-\d+\(1\)\n//g;
} elsif ($TargetPlatform =~ /^powerpc-apple-.*/) {
$p =~ s/^\tmflr r0\n//;
$p =~ s/^\tbl saveFP # f\d+\n//;
$p =~ s/^\tstmw r\d+,-\d+\(r1\)\n//;
$p =~ s/^\tstfd f\d+,-\d+\(r1\)\n//g;
$p =~ s/^\tstw r0,\d+\(r1\)\n//g;
$p =~ s/^\tstwu r1,-\d+\(r1\)\n//;
$p =~ s/^\tstw r\d+,-\d+\(r1\)\n//g;
} else {
print STDERR "$Pgm: unknown prologue mangling? $TargetPlatform\n";
}
# HWL HACK: dont die, just print a warning
#print stderr "HWL: this should die! Prologue junk?: $p\n" if $p =~ /^\t[^\.]/
# && $TargetPlatform !~ /^powerpc-/; #ToDo: remove test
die "Prologue junk?: $p\n" if $p =~ /^\t[^\.]/
&& $TargetPlatform !~ /^powerpc-/; #ToDo: remove test
if ($TargetPlatform =~ /^powerpc-apple-.*/) {
# on PowerPC, we have to keep a part of the prologue
# (which loads the current instruction pointer into register r31)
$u_p = $p; # $u_p is for unexpected prologue
$u_p =~ s/^\tbcl 20,31,L\d+\$pb\n//;
$u_p =~ s/^L\d+\$pb:\n//;
$u_p =~ s/^\tmflr r31\n//;
die "Prologue junk?: $u_p\n" if $u_p =~ /^\t[^\.]/
} else {
# HWL HACK: dont die, just print a warning
#print stderr "HWL: this should die! Prologue junk?: $p\n" if $p =~ /^\t[^\.]/;
die "Prologue junk?: $p\n" if $p =~ /^\t[^\.]/;
}
# glue together what's left
$c = $p . $r;
$c =~ s/\n\t\n/\n/; # junk blank line
......@@ -767,18 +730,17 @@ sub mangle_asm {
$e =~ s/^\tlw\t\$fp,\d+\(\$sp\)\n//;
$e =~ s/^\taddu\t\$sp,\$sp,\d+\n//;
$e =~ s/^\tj\t\$31\n//;
} elsif ($TargetPlatform =~ /^powerpc-|^rs6000-/) {
$e =~ s/^\taddi 1,1,\d+\n//;
$e =~ s/^\tcal 1,\d+\(1\)\n//;
$e =~ s/^\tlw?z? \d+,\d+\(1\)\n//;
$e =~ s/^\tmtlr 0\n//;
$e =~ s/^\tbl?r\n//;
} elsif ($TargetPlatform =~ /^powerpc-apple-.*/) {
$e =~ s/^\taddi r1,r1,\d+\n//;
$e =~ s/^\tcal r1,\d+\(r1\)\n//;
$e =~ s/^\tlw?z? r\d+,\d+\(r1\)\n//;
$e =~ s/^\tmtlr r0\n//;
$e =~ s/^\tblr\n//;
} else {
print STDERR "$Pgm: unknown epilogue mangling? $TargetPlatform\n";
}
print STDERR "WARNING: Epilogue junk?: $e\n" if $e =~ /^\t\s*[^\.\s\n]/
&& $TargetPlatform !~ /^powerpc-/; #ToDo: remove test
print STDERR "WARNING: Epilogue junk?: $e\n" if $e =~ /^\t\s*[^\.\s\n]/;
# glue together what's left
$c = $r . $e;
......@@ -799,6 +761,7 @@ sub mangle_asm {
# toss all calls to __DISCARD__
$c =~ s/^\t(call|jbsr|jal)\s+${T_US}__DISCARD__\n//go;
# ###WTT### $c =~ s/^\tbl\s+L___DISCARD__\$stub\n//go if $TargetPlatform =~ /^powerpc-apple-.*/;
# MIPS: that may leave some gratuitous asm macros around
# (no harm done; but we get rid of them to be tidier)
......@@ -942,26 +905,7 @@ sub mangle_asm {
if ( $chkcat[$i] eq 'misc' ) {
if ($chk[$i] ne '') {
print OUTASM $T_HDR_misc;
if ($TargetPlatform =~ /^powerpc-|^rs6000/) {
$chksymb[$i] =~ s/://;
#new if ($chksymb[$i] =~ /ret.*upd/ || $KNOWN_FUNNY_THING{$chksymb[$i]}
#new || $chksymb[$i] =~ /^$.{T_US}_(PRIn|PRStart).*${T_POST_LBL}$/o )
#new { print OUTASM "\t\.globl $chksymb[$i]\n"; }
# if ($chksymb[$i] ne '' && $chksymb[$i] !~ /ret_[a-z]/ && $chksymb[$i] !~ /djn_[a-z]/)
if ($chksymb[$i] ne '')
{ print OUTASM "\t\.globl \.$chksymb[$i]\n"; };
if ($chk[$i] =~ /TOC\[tc0\], 0\n/)
{ ($p, $r) = split(/TOC\[tc0\], 0\n/, $chk[$i]); $printDS = 1;}
else { $r = $chk[$i]; $printDS = 0; };
$chk[$i] = &mangle_powerpc_tailjump($r);
};
&print_doctored($chk[$i], 0);
if ($TargetPlatform =~ /^powerpc-|^rs6000-/ && $printDS) {
#ok if ($chksymb[$i] !~ /\__stginit_Main/) {
print OUTASM "\.csect ${chksymb[$i]}[DS]\n";
print OUTASM "${p}TOC[tc0], 0\n";
#ok }
}
}
} elsif ( $chkcat[$i] eq 'toss' ) {
......@@ -1040,18 +984,8 @@ sub mangle_asm {
if ( defined($infochk{$symb}) ) {
print OUTASM $T_HDR_info;
if ($TargetPlatform =~ /^powerpc-|^rs6000-/) {
if ( !defined($slowchk{$symb}) && defined($fastchk{$symb}) ) {
$fastname = $chk[$fastchk{$symb}];
$fastname =~ s/([_A-Za-z]*_fast\d+):.*(.*\n)*/\1/;
$chk[$infochk{$symb}] =~ s/\.long StdErrorCode/\.long $fastname/;
}
$chk[$infochk{$symb}] =~ s/\.long ([_A-Za-z]\S+_entry)/\.long \.\1/;
$chk[$infochk{$symb}] =~ s/\.long ([A-Za-z]\S+_upd)/\.long \.\1/;
print OUTASM $chk[$infochk{$symb}];
} else {
print OUTASM &rev_tbl($symb, $chk[$infochk{$symb}], 1);
}
print OUTASM &rev_tbl($symb, $chk[$infochk{$symb}], 1);
# entry code will be put here!
$chkcat[$infochk{$symb}] = 'DONE ALREADY';
......@@ -1063,18 +997,6 @@ sub mangle_asm {
# teach it to drop through to the fast entry point:
$c = $chk[$slowchk{$symb}];
if ($TargetPlatform =~ /^powerpc-|^rs6000-/) {
($p, $r) = split(/TOC\[tc0\], 0\n/, $c);
if ($symb =~ /^[_A-Z]/)
{
print OUTASM "\t\.globl \.${chksymb[$i]}_entry\n";
print OUTASM "\.csect ${symb}_entry[DS]\n";
print OUTASM "${p}TOC[tc0], 0\n";
};
$r =~ s/\.csect \.text\[PR\]\n//; # todo: properly - andre
$c = &mangle_powerpc_tailjump($r);
};
if ( defined($fastchk{$symb}) ) {
if ( $TargetPlatform =~ /^alpha-/ ) {
$c =~ s/^\tjmp \$31,\(\$27\),0\n\t\.align 4\n\t\.end/\t.align 4\n\t.end/;
......@@ -1094,8 +1016,12 @@ sub mangle_asm {
} elsif ( $TargetPlatform =~ /^m68k-/ ) {
$c =~ s/^\tjmp ${T_US}${symb}_fast\d+.*\n\tnop\n//;
$c =~ s/^\tjmp ${T_US}${symb}_fast\d+.*\n//;
} elsif ( $TargetPlatform =~ /^powerpc-|^rs6000-/ ) {
$c =~ s/^\tb \.${T_US}${symb}_fast\d+\n//;
} elsif ( $TargetPlatform =~ /^powerpc-apple-.*/ ) {
$c =~ s/^\taddis r9,r31,ha16\(L_${symb}_fast\d*\$non_lazy_ptr-L\d+\$pb\)\n\tlwz r9,lo16\(L_${symb}_fast\d*\$non_lazy_ptr-L\d+\$pb\)\(r9\)\n\tmtctr r9\n\tbctr\n//;
# addis r9,r31,ha16(L_XXXX_fast3$non_lazy_ptr-L32$pb)
# lwz r9,lo16(L_XXXX_fast3$non_lazy_ptr-L32$pb)(r9)
# mtctr r9
# bctr
} elsif ( $TargetPlatform =~ /^sparc-/ ) {
$c =~ s/^\tcall\s+${T_US}${symb}_fast\d+,.*\n\t\s*nop\n//;
$c =~ s/^\tcall\s+${T_US}${symb}_fast\d+,.*\n(\t\s*[a-z].*\n)/$1/;
......@@ -1104,7 +1030,7 @@ sub mangle_asm {
}
}
if ( $TargetPlatform !~ /^(alpha-|hppa|mips-)/ ) {
if ( $TargetPlatform !~ /^(alpha-|hppa|mips-|powerpc-apple-)/) {
# On alphas, hppa: no very good way to look for "dangling"
# references to fast-entry point.
# (questionable re hppa and mips...)
......@@ -1129,18 +1055,7 @@ sub mangle_asm {
) {
print OUTASM $T_HDR_fast;
}
if ($TargetPlatform =~ /^powerpc-|^rs6000-/) {
local(@lbls) = split(/:/, $c);
$fullname = $lbls[0];
$fullname =~ s/$T_MOVE_DIRVS//g;
if ( $fullname =~ /^[A-Z]/)
{ print OUTASM "\t\.globl \.${fullname}\n";
} else {
# print OUTASM "\t\.lglobl \.${fullname}\n"; #todo: rm - andre
};
$c =~ s/((.*\n)*)\t.long \S+, TOC\[tc0\], 0\n\.csect \.text\[PR\]\n((.*\n)*)/\1\3/;
$c = &mangle_powerpc_tailjump($c);
};
&print_doctored($c, 0);
$chkcat[$fastchk{$symb}] = 'DONE ALREADY';
}
......@@ -1152,16 +1067,8 @@ sub mangle_asm {
# VECTOR TABLE
if ( defined($vectorchk{$symb}) ) {
print OUTASM $T_HDR_vector;
if ($TargetPlatform =~ /^powerpc-|^rs6000-/) {
if ( $symb =~ /^[A-Z]/) {
print OUTASM "\t\.globl \.${symb}_vtbl\n";
print OUTASM "\t\.globl ${symb}_vtbl\n";
};
$chk[$vectorchk{$symb}] =~ s/\.long (\S+)/\.long \.\1/g;
print OUTASM ".${symb}_vtbl:\n";
print OUTASM $chk[$vectorchk{$symb}];
} else {
print OUTASM &rev_tbl($symb, $chk[$vectorchk{$symb}], 0);
print OUTASM &rev_tbl($symb, $chk[$vectorchk{$symb}], 0);
# DO NOT DELETE THE NEXT LINE. It fixes a rather subtle GC bug
# which showed up as a segfault reported by Ryszard Kubiak.
# Problem is with vector tables. They wind up as follows:
......@@ -1180,8 +1087,8 @@ sub mangle_asm {
# ensure that the label is in the same segment as the vtbl proper.
# The native code generator has an analogous fix; see
# ghc/compiler/nativeGen/AbsCStixGen.lhs line 107.
print OUTASM "${T_create_word} 0\n";
}
print OUTASM "${T_create_word} 0\n";
# direct return code will be put here!
$chkcat[$vectorchk{$symb}] = 'DONE ALREADY';
......@@ -1216,10 +1123,6 @@ sub mangle_asm {
print OUTASM $EXTERN_DECLS if $TargetPlatform =~ /^mips-/;
if ($TargetPlatform =~ /^powerpc-|^rs6000-/) {
print OUTASM ".csect .text[PR]\n_section_.text:\n.csect .data[RW]\n\t.long _section_.text\n"
};
# finished
close(OUTASM) || &tidy_up_and_die(1,"Failed writing to $out_asmf\n");
close(INASM) || &tidy_up_and_die(1,"Failed reading from $in_asmf\n");
......@@ -1530,54 +1433,6 @@ sub mini_mangle_asm_hppa {
}
\end{code}
\begin{code}
sub mini_mangle_asm_powerpc {
local($in_asmf, $out_asmf) = @_;
open(INASM, "< $in_asmf")
|| &tidy_up_and_die(1,"$Pgm: failed to open `$in_asmf' (to read)\n");
open(OUTASM,"> $out_asmf")
|| &tidy_up_and_die(1,"$Pgm: failed to open `$out_asmf' (to write)\n");
while (<INASM>) {
s/long _PRStart/long ._PRStart/;
s/long _PRIn_/long ._PRIn_/;
s/long _Dummy_(\S+)_entry/long ._Dummy_\1_entry/;
s/long _PRMarking_MarkNextRoot\[DS\]/long ._PRMarking_MarkNextRoot/;
s/long _PRMarking_MarkNextCAF\[DS\]/long ._PRMarking_MarkNextCAF/;
s/long _PRMarking_MarkNextAStack\[DS\]/long ._PRMarking_MarkNextAStack/;
s/long _PRMarking_MarkNextBStack\[DS\]/long ._PRMarking_MarkNextBStack/;
s/\.tc EnterNodeCode\[TC]\,EnterNodeCode\[DS\]/\.tc EnterNodeCode\[TC]\,.EnterNodeCode/; # CONC
s/\.tc CheckHeapCode\[TC]\,CheckHeapCode\[DS\]/\.tc CheckHeapCode\[TC]\,.CheckHeapCode/; # CONC
print OUTASM;
}
# finished:
close(OUTASM) || &tidy_up_and_die(1,"Failed writing to $out_asmf\n");
close(INASM) || &tidy_up_and_die(1,"Failed reading from $in_asmf\n");
}
sub mangle_powerpc_tailjump {
local($c) = @_;
local($maybe_more) = 1;
while (($c =~ /\tlw?z? \d+,LC\.\.\d+\(2\)\n\tmtctr \d+\n\tbctr\n/) && $maybe_more)
{ $maybe_more = 0;
$lcsymb = $c;
$lcsymb =~ s/(.*\n)*\tlw?z? \d+,LC\.\.(\d+)\(2\)\n\tmtctr \d+\n\tbctr\n(.*\n)*/\2/;
# the checks for r1 and r2 are mostly paranoia...
$r1 = $c;
$r1 =~ s/(.*\n)*\tlw?z? (\d+),LC\.\.\d+\(2\)\n\tmtctr \d+\n\tbctr\n(.*\n)*/\2/;
$r2 = $c;
$r2 =~ s/(.*\n)*\tlw?z? \d+,LC\.\.(\d+)\(2\)\n\tmtctr (\d+)\n\tbctr\n(.*\n)*/\3/;
if (r1 == r2)
{ $maybe_more = 1;
$c =~ s/((.*\n)*)\tlw?z? \d+,LC\.\.\d+\(2\)\n\tmtctr \d+\n\tbctr\n((.*\n)*)/\1\tb $tocequiv{$lcsymb}\n\3/;
}
};
$c;
}
\end{code}
\begin{code}
sub tidy_up_and_die {
......
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