1 eval "exec perl -S $0 $*"
2 if $running_under_some_random_shell;
4 # reads CPP output and turns #line things into appropriate Haskell
7 # considered to be GHC-project specific
10 # OPTIONALLY processes GENERATE_SPECS pragmas
11 # when give flag -genSPECS
15 # {-# GENERATE_SPECS a b #-}
21 # {-# SPECIALIZE fn :: type[ a/a,u1/b] #-}
22 # {-# SPECIALIZE fn :: type[ a/a,u2/b] #-}
23 # {-# SPECIALIZE fn :: type[u1/a, b/b] #-}
24 # {-# SPECIALIZE fn :: type[u1/a,u1/b] #-}
25 # {-# SPECIALIZE fn :: type[u1/a,u2/b] #-}
26 # {-# SPECIALIZE fn :: type[u2/a, b/b] #-}
27 # {-# SPECIALIZE fn :: type[u2/a,u1/b] #-}
28 # {-# SPECIALIZE fn :: type[u2/a,u2/b] #-}
30 # where the u's are extracted from a predetermined
31 # set of unboxed types $SpecingString
33 # The types to substitute can be specified explicitly in { }s following
38 # {-# GENERATE_SPECS a{ty1,ty2...} b{+,ty1,ty2...} c{~,ty1,ty2,...} d{~,+,ty1,ty2,...} #-}
42 # ~ indicates that no specialisations are to be left polymorhphic in this type variable
43 # (this is required for overloaded tyvars which must have ground specialisations)
44 # + indicates that the predetermined types are to be added to the list
46 # Note: There must be no white space between { }s
47 # Use ( )s around type names when separation is required
51 while ($#ARGV >= 0 && $ARGV[0] eq '-v' || $ARGV[0] =~ /^-genSPECS/) {
52 if ($ARGV[0] eq '-v') {
54 } elsif ( $ARGV[0] eq '-genSPECS0' ) { # do it, but no SpecingString
60 $SpecingString = $ARGV[0];
61 @SpecingTypes = split(/,/, $SpecingString);
66 #ToDo: print a version number ?
68 $OrigCpp = '$(RAWCPP)';
70 if ( $OrigCpp =~ /(\S+)\s+(.*)/ ) {
73 if ( -x $cmd ) { # cool
75 } else { # oops; try to guess
76 $GccV = `gcc -v 2>&1`;
77 if ( $GccV =~ /Reading specs from (.*)\/specs/ ) {
78 $Cpp = "$1/cpp $rest";
80 die "hscpp: don't know how to run cpp: $OrigCpp\n";
87 print STDERR "hscpp:CPP invoked: $Cpp @ARGV\n" if $Verbose;
89 open(INPIPE, "$Cpp @ARGV |") || die "Can't open C pre-processor pipe\n";
93 # line directives come in flavo[u]rs:
94 # s/^#\s*line\s+\d+$/\{\-# LINE \-\}/; IGNORE THIS ONE FOR NOW
95 s/^#\s*line\s+(\d+)\s+(\".+\")$/\{\-# LINE \1 \2 \-\}/;
96 s/^#\s*(\d+)\s+(\".*\").*/\{\-# LINE \1 \2 \-\}/;
99 if ( /^\s*\{-#\s*GENERATE_SPECS/ ) {
105 if ( /^\s*\{-#\s*GENERATE_SPECS\s+(data)\s+(\S.*)\s*::(.*)#-\}\s*$/ ) {
110 } elsif ( /^\s*\{-#\s*GENERATE_SPECS\s+(instance)\s+(\S.*)\s*::(.*)#-\}\s*$/ ) {
115 } elsif ( /^\s*\{-#\s*GENERATE_SPECS\s+(\S+)\s+(.*)\s*#-\}\s*$/ ) {
121 while ( $tysig =~ /^\s*$/ ) {
125 $funpat = $fun; # quote non alphanumeric characters in pattern
126 $funpat =~ s/(\W)/\\\1/g;
127 $tysig =~ /^\s*$funpat\s*::(.*)$/ || die "Error: GENERATE_SPECS not followed by type signature for $fun:\n$line$tysig\n";
129 $type =~ s/^(.*)=>//; # remove context from type
131 die "Error: invlaid GENERATE_SPECS pragma:\n $_";
134 @tyvars = split(/\s+/, $vars);
136 foreach $var (@tyvars) {
139 if ( $var =~ /^(\w+)\{(.*)\}$/ ) {
141 @specing_types = split(/,/, $2);
142 if ($specing_types[0] eq '~') {
143 shift(@specing_types);
144 @tospec = (); # remove specs polymorphic in this tyvar
147 if ($specing_types[0] eq '+') {
148 shift(@specing_types);
149 unshift(@specing_types, @SpecingTypes);
152 @specing_types = @SpecingTypes;
155 foreach $uty (@specing_types) {
157 foreach $i (0..$#speced) {
158 $speced[$i] =~ s/\b$var\b/$uty/g ;
160 push(@tospec, @speced);
163 shift(@tospec) if $remove_poly; # remove fully polymorphic spec
166 $specty = shift(@tospec);
167 print ($data_or_inst ? "{-# SPECIALIZE $data_inst_str $specty #-}" : "{-# SPECIALIZE $fun :: $specty");
168 while ($#tospec >= 0) {
169 $specty = shift(@tospec);
170 print ($data_or_inst ? "; {-# SPECIALIZE $data_inst_str $specty #-}" : ", $specty");
172 print ($data_or_inst ? "\n" : " #-}\n");
174 print "{-# NO_SPECS_GENERATED ", $data_or_inst ? $specty : $fun, " #-}\n";
176 print $tysig if ! $data_or_inst;
178 print STDERR "Warning: GENERATE_SPECS pre-processing pragma ignored:\n $_";
186 close(INPIPE) || exit(1); # exit is so we reflect any errors.