perl-5.16.2/regen_perly.pl - toolchain/perl - Git at Google

 #!/usr/bin/perl
 #
 # regen_perly.pl, DAPM 12-Feb-04
 #
 # Copyright (c) 2004, 2005, 2006, 2009, 2010, 2011 Larry Wall
 #
 # Given an input file perly.y, run bison on it and produce
 # the following output files:
 #
 # perly.h	standard bison header file with minor doctoring of
 #		#line directives plus adding a #ifdef PERL_CORE
 #
 # perly.tab	the parser table C definitions extracted from the bison output
 #		plus an extra table generated by this script.
 #
 # perly.act	the action case statements extracted from the bison output
 #
 # Note that perly.c is *not* regenerated - this is now a static file which
 # is not dependent on perly.y any more.
 #
 # If a filename of the form foo.y is given on the command line, then
 # this is used instead as the basename for all the files mentioned
 # above.
 #
 # Note that temporary files of the form perlytmp.h and perlytmp.c are
 # created and then deleted during this process
 #
 # Note also that this script is intended to be run on a UNIX system;
 # it may work elsewhere but no specific attempt has been made to make it
 # portable.

 use 5.006;
 sub usage { die "usage: $0 [ -b bison_executable ] [ file.y ]\n" }

 use warnings;
 use strict;

 BEGIN { require 'regen/regen_lib.pl'; }

 my $bison = 'bison';

 if (@ARGV >= 2 and $ARGV[0] eq '-b') {
     shift;
     $bison = shift;
 }

 my $y_file = shift || 'perly.y';

 usage unless @ARGV==0 && $y_file =~ /\.y$/;

 (my $h_file    = $y_file) =~ s/\.y$/.h/;
 (my $act_file  = $y_file) =~ s/\.y$/.act/;
 (my $tab_file  = $y_file) =~ s/\.y$/.tab/;
 (my $tmpc_file = $y_file) =~ s/\.y$/tmp.c/;
 (my $tmph_file = $y_file) =~ s/\.y$/tmp.h/;

 # the yytranslate[] table generated by bison is ASCII/EBCDIC sensitive

 die "$0: must be run on an ASCII system\n" unless ord 'A' == 65;

 # check for correct version number. The constraints are:
 #  * must be >= 1.24 to avoid licensing issues.
 #  * it must generate the yystos[] table. Version 1.28 doesn't generate
 #    this; 1.35+ does
 #  * Must produce output which is extractable by the regexes below
 #  * Must produce the right values.
 # These last two constraints  may well be met by earlier versions, but
 # I simply haven't tested them yet. If it works for you, then modify
 # the test below to allow that version too. DAPM Feb 04.

 my $version = `$bison -V`;
 unless ($version) { die <<EOF; }
 Could not find a version of bison in your path. Please install bison.
 EOF

 unless ($version =~ /\b(1\.875[a-z]?|2\.[0134])\b/) { die <<EOF; }

 You have the wrong version of bison in your path; currently 1.875
 2.0, 2.1, 2.3 or 2.4 is required.  Try installing
     http://ftp.gnu.org/gnu/bison/bison-2.4.1.tar.gz
 or similar.  Your bison identifies itself as:

 $version
 EOF

 # creates $tmpc_file and $tmph_file
 my_system("$bison -d -o $tmpc_file $y_file");

 open my $ctmp_fh, '<', $tmpc_file or die "Can't open $tmpc_file: $!\n";
 my $clines;
 { local $/; $clines = <$ctmp_fh>; }
 die "failed to read $tmpc_file: length mismatch\n"
     unless length $clines == -s $tmpc_file;
 close $ctmp_fh;

 my ($actlines, $tablines) = extract($clines);

 $tablines .= make_type_tab($y_file, $tablines);

 my ($act_fh, $tab_fh, $h_fh) = map {
     open_new($_, '>', { by => $0, from => $y_file });
 } $act_file, $tab_file, $h_file;

 print $act_fh $actlines;

 print $tab_fh $tablines;

 unlink $tmpc_file;

 # Wrap PERL_CORE round the symbol definitions. Also,  the
 # C<#line 30 "perly.y"> confuses the Win32 resource compiler and the
 # C<#line 188 "perlytmp.h"> gets picked up by make depend, so remove them.

 open my $tmph_fh, '<', $tmph_file or die "Can't open $tmph_file: $!\n";

 my $endcore_done = 0;
 # Token macros need to be generated manually on bison 2.4
 my $gather_tokens = ($version =~ /\b2\.4\b/ ? undef : 0);
 my $tokens;
 while (<$tmph_fh>) {
     print $h_fh "#ifdef PERL_CORE\n" if $. == 1;
     if (!$endcore_done and /YYSTYPE_IS_DECLARED/) {
 	print $h_fh "#endif /* PERL_CORE */\n";
 	$endcore_done = 1;
     }
     next if /^#line \d+ ".*"/;
     if (not defined $gather_tokens) {
 	$gather_tokens = 1 if /^\s* enum \s* yytokentype \s* \{/x;
     }
     elsif ($gather_tokens) {
 	if (/^\# \s* endif/x) { # The #endif just after the end of the token enum
 	    $gather_tokens = 0;
 	    $_ .= "\n/* Tokens.  */\n$tokens";
 	}
 	else {
 	    my ($tok, $val) = /(\w+) \s* = \s* (\d+)/x;
 	    $tokens .= "#define $tok $val\n" if $tok;
 	}
     }
     print $h_fh $_;
 }
 close $tmph_fh;
 unlink $tmph_file;

 foreach ($act_fh, $tab_fh, $h_fh) {
     read_only_bottom_close_and_rename($_, ['regen_perly.pl', $y_file]);
 }

 exit 0;


 sub extract {
     my $clines = shift;
     my $tablines;
     my $actlines;

     $clines =~ m@
 	(?:
 	    ^/* YYFINAL[^\n]+\n		#optional comment
 	)?
 	\# \s* define \s* YYFINAL	# first #define
 	.*?				# other defines + most tables
 	yystos\[\]\s*=			# start of last table
 	.*?
 	}\s*;				# end of last table
     @xms
 	or die "Can't extract tables from $tmpc_file\n";
     $tablines = $&;


     $clines =~ m@
 	switch \s* \( \s* \w+ \s* \) \s* { \s*
 	(
 	    case \s* \d+ \s* :
 	    \s*
 	    (?: \s* /\* .*? \*/ \s* )*	# optional C-comments
 	    \s*
 	    \#line [^\n]+"\Q$y_file\E"
 	    .*?
 	)
 	}
 	\s*
 	(?: \s* /\* .*? \*/ \s* )*	# optional C-comments
 	\s*
 	(
 	    \#line[^\n]+\.c"
 	|
 	    \#line[^\n]+\.simple"
 	|
 	    YY_SYMBOL_PRINT
 	)
     @xms
 	or die "Can't extract actions from $tmpc_file\n";
     $actlines = $1;

     # Remove extraneous comments from bison 2.4
     $actlines =~ s!\s* /\* \s* Line \s* \d+ \s* of \s* yacc\.c \s* \*/!!gx;

     # C<#line 188 "perlytmp.c"> gets picked up by make depend, so remove them.
     $actlines =~ s/^#line \d+ "\Q$tmpc_file\E".*$//gm;

     # convert yyvsp[nnn] into ps[nnn].val

     $actlines =~ s/yyvsp\[(.*?)\]/ps[$1].val/g
 	or die "Can't convert value stack name\n";

     return $actlines. "\n", $tablines. "\n";
 }

 # Generate a table, yy_type_tab[], that specifies for each token, what
 # type of value it holds.
 #
 # Read the .y file and extract a list of all the token names and
 # non-terminal names; then scan the string $tablines for the table yytname,
 # which gives the token index of each token/non-terminal; then use this to
 # create yy_type_tab.
 #
 # ie given (in perly.y),
 #
 #   %token <opval> A
 #   %token <ival>  B
 #   %type  <pval>  C
 #   %type  <opval> D
 #
 # and (in $tablines),
 #
 #   yytname[] = { "A" "B", "C", "D", "E" };
 #
 # then return
 #
 #    typedef enum { toketype_ival, toketype_opval, toketype_pval } toketypes;
 #
 #    static const toketypes yy_type_tab[]
 #          = { toketype_opval, toketype_ival, toketype_pval,
 #                toketype_opval, toketype_ival }
 #
 # where "E" has the default type. The default type is determined
 # by the __DEFAULT__ comment  next to the appropriate union member in
 # perly.y

 sub make_type_tab {
     my ($y_file, $tablines) = @_;
     my %tokens;
     my %types;
     my $default_token;
     open my $fh, '<', $y_file or die "Can't open $y_file: $!\n";
     while (<$fh>) {
 	if (/(\$\d+)\s*=/) {
 	    warn "$y_file:$.: dangerous assignment to $1: $_";
 	}

 	if (/__DEFAULT__/) {
 	    m{(\w+) \s* ; \s* /\* \s* __DEFAULT__}x
 		or die "$y_file: can't parse __DEFAULT__ line: $_";
 	    die "$y_file: duplicate __DEFAULT__ line: $_"
 		    if defined $default_token;
 	    $default_token = $1;
 	    next;
 	}

 	next unless /^%(token|type)/;
 	s/^%(token|type)\s+<(\w+)>\s+//
 	    or die "$y_file: unparseable token/type line: $_";
 	$tokens{$_} = $2 for (split ' ', $_);
 	$types{$2} = 1;
     }
     die "$y_file: no __DEFAULT__ token defined\n" unless $default_token;
     $types{$default_token} = 1;

     $tablines =~ /^\Qstatic const char *const yytname[] =\E\n
 	    {\n
 	    (.*?)
 	    ^};
 	    /xsm
 	or die "Can't extract yytname[] from table string\n";
     my $fields = $1;
     $fields =~ s{"([^"]+)"}
 		{ "toketype_" .
 		    (defined $tokens{$1} ? $tokens{$1} : $default_token)
 		}ge;
     $fields =~ s/, \s* 0 \s* $//x
 	or die "make_type_tab: couldn't delete trailing ',0'\n";

     return
 	  "\ntypedef enum {\n\t"
 	. join(", ", map "toketype_$_", sort keys %types)
 	. "\n} toketypes;\n\n"
 	. "/* type of each token/terminal */\n"
 	. "static const toketypes yy_type_tab[] =\n{\n"
 	. $fields
 	. "\n};\n";
 }


 sub my_system {
     system(@_);
     if ($? == -1) {
 	die "failed to execute command '@_': $!\n";
     }
     elsif ($? & 127) {
 	die sprintf "command '@_' died with signal %d\n",
 	    ($? & 127);
     }
     elsif ($? >> 8) {
 	die sprintf "command '@_' exited with value %d\n", $? >> 8;
     }
 }
	#!/usr/bin/perl
	#
	# regen_perly.pl, DAPM 12-Feb-04
	#
	# Copyright (c) 2004, 2005, 2006, 2009, 2010, 2011 Larry Wall
	#
	# Given an input file perly.y, run bison on it and produce
	# the following output files:
	#
	# perly.h standard bison header file with minor doctoring of
	# #line directives plus adding a #ifdef PERL_CORE
	#
	# perly.tab the parser table C definitions extracted from the bison output
	# plus an extra table generated by this script.
	#
	# perly.act the action case statements extracted from the bison output
	#
	# Note that perly.c is not regenerated - this is now a static file which
	# is not dependent on perly.y any more.
	#
	# If a filename of the form foo.y is given on the command line, then
	# this is used instead as the basename for all the files mentioned
	# above.
	#
	# Note that temporary files of the form perlytmp.h and perlytmp.c are
	# created and then deleted during this process
	#
	# Note also that this script is intended to be run on a UNIX system;
	# it may work elsewhere but no specific attempt has been made to make it
	# portable.

	use 5.006;
	sub usage { die "usage: $0 [ -b bison_executable ] [ file.y ]\n" }

	use warnings;
	use strict;

	BEGIN { require 'regen/regen_lib.pl'; }

	my $bison = 'bison';

	if (@ARGV >= 2 and $ARGV[0] eq '-b') {
	shift;
	$bison = shift;
	}

	my $y_file = shift \|\| 'perly.y';

	usage unless @ARGV==0 && $y_file =~ /\.y$/;

	(my $h_file = $y_file) =~ s/\.y$/.h/;
	(my $act_file = $y_file) =~ s/\.y$/.act/;
	(my $tab_file = $y_file) =~ s/\.y$/.tab/;
	(my $tmpc_file = $y_file) =~ s/\.y$/tmp.c/;
	(my $tmph_file = $y_file) =~ s/\.y$/tmp.h/;

	# the yytranslate[] table generated by bison is ASCII/EBCDIC sensitive

	die "$0: must be run on an ASCII system\n" unless ord 'A' == 65;

	# check for correct version number. The constraints are:
	# * must be >= 1.24 to avoid licensing issues.
	# * it must generate the yystos[] table. Version 1.28 doesn't generate
	# this; 1.35+ does
	# * Must produce output which is extractable by the regexes below
	# * Must produce the right values.
	# These last two constraints may well be met by earlier versions, but
	# I simply haven't tested them yet. If it works for you, then modify
	# the test below to allow that version too. DAPM Feb 04.

	my $version = `$bison -V`;
	unless ($version) { die <<EOF; }
	Could not find a version of bison in your path. Please install bison.
	EOF

	unless ($version =~ /\b(1\.875[a-z]?\|2\.[0134])\b/) { die <<EOF; }

	You have the wrong version of bison in your path; currently 1.875
	2.0, 2.1, 2.3 or 2.4 is required. Try installing
	http://ftp.gnu.org/gnu/bison/bison-2.4.1.tar.gz
	or similar. Your bison identifies itself as:

	$version
	EOF

	# creates $tmpc_file and $tmph_file
	my_system("$bison -d -o $tmpc_file $y_file");

	open my $ctmp_fh, '<', $tmpc_file or die "Can't open $tmpc_file: $!\n";
	my $clines;
	{ local $/; $clines = <$ctmp_fh>; }
	die "failed to read $tmpc_file: length mismatch\n"
	unless length $clines == -s $tmpc_file;
	close $ctmp_fh;

	my ($actlines, $tablines) = extract($clines);

	$tablines .= make_type_tab($y_file, $tablines);

	my ($act_fh, $tab_fh, $h_fh) = map {
	open_new($_, '>', { by => $0, from => $y_file });
	} $act_file, $tab_file, $h_file;

	print $act_fh $actlines;

	print $tab_fh $tablines;

	unlink $tmpc_file;

	# Wrap PERL_CORE round the symbol definitions. Also, the
	# C<#line 30 "perly.y"> confuses the Win32 resource compiler and the
	# C<#line 188 "perlytmp.h"> gets picked up by make depend, so remove them.

	open my $tmph_fh, '<', $tmph_file or die "Can't open $tmph_file: $!\n";

	my $endcore_done = 0;
	# Token macros need to be generated manually on bison 2.4
	my $gather_tokens = ($version =~ /\b2\.4\b/ ? undef : 0);
	my $tokens;
	while (<$tmph_fh>) {
	print $h_fh "#ifdef PERL_CORE\n" if $. == 1;
	if (!$endcore_done and /YYSTYPE_IS_DECLARED/) {
	print $h_fh "#endif /* PERL_CORE */\n";
	$endcore_done = 1;
	}
	next if /^#line \d+ ".*"/;
	if (not defined $gather_tokens) {
	$gather_tokens = 1 if /^\s* enum \s* yytokentype \s* \{/x;
	}
	elsif ($gather_tokens) {
	if (/^\# \s* endif/x) { # The #endif just after the end of the token enum
	$gather_tokens = 0;
	$_ .= "\n/* Tokens. */\n$tokens";
	}
	else {
	my ($tok, $val) = /(\w+) \s* = \s* (\d+)/x;
	$tokens .= "#define $tok $val\n" if $tok;
	}
	}
	print $h_fh $_;
	}
	close $tmph_fh;
	unlink $tmph_file;

	foreach ($act_fh, $tab_fh, $h_fh) {
	read_only_bottom_close_and_rename($_, ['regen_perly.pl', $y_file]);
	}

	exit 0;


	sub extract {
	my $clines = shift;
	my $tablines;
	my $actlines;

	$clines =~ m@
	(?:
	^/* YYFINAL[^\n]+\n #optional comment
	)?
	\# \s* define \s* YYFINAL # first #define
	.*? # other defines + most tables
	yystos\[\]\s*= # start of last table
	.*?
	}\s*; # end of last table
	@xms
	or die "Can't extract tables from $tmpc_file\n";
	$tablines = $&;


	$clines =~ m@
	switch \s* \( \s* \w+ \s* \) \s* { \s*
	(
	case \s* \d+ \s* :
	\s*
	(?: \s* /\* .? \/ \s* )* # optional C-comments
	\s*
	\#line [^\n]+"\Q$y_file\E"
	.*?
	)
	}
	\s*
	(?: \s* /\* .? \/ \s* )* # optional C-comments
	\s*
	(
	\#line[^\n]+\.c"
	\|
	\#line[^\n]+\.simple"
	\|
	YY_SYMBOL_PRINT
	)
	@xms
	or die "Can't extract actions from $tmpc_file\n";
	$actlines = $1;

	# Remove extraneous comments from bison 2.4
	$actlines =~ s!\s* /\* \s* Line \s* \d+ \s* of \s* yacc\.c \s* \*/!!gx;

	# C<#line 188 "perlytmp.c"> gets picked up by make depend, so remove them.
	$actlines =~ s/^#line \d+ "\Q$tmpc_file\E".*$//gm;

	# convert yyvsp[nnn] into ps[nnn].val

	$actlines =~ s/yyvsp\[(.*?)\]/ps[$1].val/g
	or die "Can't convert value stack name\n";

	return $actlines. "\n", $tablines. "\n";
	}

	# Generate a table, yy_type_tab[], that specifies for each token, what
	# type of value it holds.
	#
	# Read the .y file and extract a list of all the token names and
	# non-terminal names; then scan the string $tablines for the table yytname,
	# which gives the token index of each token/non-terminal; then use this to
	# create yy_type_tab.
	#
	# ie given (in perly.y),
	#
	# %token <opval> A
	# %token <ival> B
	# %type <pval> C
	# %type <opval> D
	#
	# and (in $tablines),
	#
	# yytname[] = { "A" "B", "C", "D", "E" };
	#
	# then return
	#
	# typedef enum { toketype_ival, toketype_opval, toketype_pval } toketypes;
	#
	# static const toketypes yy_type_tab[]
	# = { toketype_opval, toketype_ival, toketype_pval,
	# toketype_opval, toketype_ival }
	#
	# where "E" has the default type. The default type is determined
	# by the __DEFAULT__ comment next to the appropriate union member in
	# perly.y

	sub make_type_tab {
	my ($y_file, $tablines) = @_;
	my %tokens;
	my %types;
	my $default_token;
	open my $fh, '<', $y_file or die "Can't open $y_file: $!\n";
	while (<$fh>) {
	if (/(\$\d+)\s*=/) {
	warn "$y_file:$.: dangerous assignment to $1: $_";
	}

	if (/__DEFAULT__/) {
	m{(\w+) \s* ; \s* /\* \s* __DEFAULT__}x
	or die "$y_file: can't parse __DEFAULT__ line: $_";
	die "$y_file: duplicate __DEFAULT__ line: $_"
	if defined $default_token;
	$default_token = $1;
	next;
	}

	next unless /^%(token\|type)/;
	s/^%(token\|type)\s+<(\w+)>\s+//
	or die "$y_file: unparseable token/type line: $_";
	$tokens{$_} = $2 for (split ' ', $_);
	$types{$2} = 1;
	}
	die "$y_file: no __DEFAULT__ token defined\n" unless $default_token;
	$types{$default_token} = 1;

	$tablines =~ /^\Qstatic const char *const yytname[] =\E\n
	{\n
	(.*?)
	^};
	/xsm
	or die "Can't extract yytname[] from table string\n";
	my $fields = $1;
	$fields =~ s{"([^"]+)"}
	{ "toketype_" .
	(defined $tokens{$1} ? $tokens{$1} : $default_token)
	}ge;
	$fields =~ s/, \s* 0 \s* $//x
	or die "make_type_tab: couldn't delete trailing ',0'\n";

	return
	"\ntypedef enum {\n\t"
	. join(", ", map "toketype_$_", sort keys %types)
	. "\n} toketypes;\n\n"
	. "/* type of each token/terminal */\n"
	. "static const toketypes yy_type_tab[] =\n{\n"
	. $fields
	. "\n};\n";
	}


	sub my_system {
	system(@_);
	if ($? == -1) {
	die "failed to execute command '@_': $!\n";
	}
	elsif ($? & 127) {
	die sprintf "command '@_' died with signal %d\n",
	($? & 127);
	}
	elsif ($? >> 8) {
	die sprintf "command '@_' exited with value %d\n", $? >> 8;
	}
	}