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t/lib/ExtUtils/ParseXS.pm  view on Meta::CPAN

      }
      if ($mode eq 'Typemap') {
	chomp;
	my $line = $_ ;
	TrimWhitespace($_) ;
	# skip blank lines and comment lines
	next if /^$/ or /^#/ ;
	my($type,$kind, $proto) = /^\s*(.*?\S)\s+(\S+)\s*($proto_re*)\s*$/ or
	  warn("Warning: File '$typemap' Line $. '$line' TYPEMAP entry needs 2 or 3 columns\n"), next;
	$type = TidyType($type) ;
	$type_kind{$type} = $kind ;
	# prototype defaults to '$'
	$proto = "\$" unless $proto ;
	warn("Warning: File '$typemap' Line $. '$line' Invalid prototype '$proto'\n")
	  unless ValidProtoString($proto) ;
	$proto_letter{$type} = C_string($proto) ;
      } elsif (/^\s/) {
	$$current .= $_;
      } elsif ($mode eq 'Input') {
	s/\s+$//;
	$input_expr{$_} = '';
	$current = \$input_expr{$_};
      } else {
	s/\s+$//;
	$output_expr{$_} = '';
	$current = \$output_expr{$_};
      }
    }
    close(TYPEMAP);
    warn sprintf "typemaps: input %d, output %d\n", scalar keys %input_expr, scalar keys %output_expr
        if $verbose;
  }

  foreach my $key (keys %input_expr) {
    $input_expr{$key} =~ s/;*\s+\z//;
  }

  my ($cast, $size);
  our $bal = qr[(?:(?>[^()]+)|\((??{ $bal })\))*]; # ()-balanced
  $cast = qr[(?:\(\s*SV\s*\*\s*\)\s*)?]; # Optional (SV*) cast
  $size = qr[,\s* (??{ $bal }) ]x; # Third arg (to setpvn)

  foreach my $key (keys %output_expr) {
    BEGIN { $^H |= 0x00200000 }; # Equivalent to: use re 'eval', but hardcoded so we can compile re.xs

    my ($t, $with_size, $arg, $sarg) =
      ($output_expr{$key} =~
       m[^ \s+ sv_set ( [iunp] ) v (n)?	# Type, is_setpvn
	 \s* \( \s* $cast \$arg \s* ,
	 \s* ( (??{ $bal }) )	# Set from
	 ( (??{ $size }) )?	# Possible sizeof set-from
	 \) \s* ; \s* $
	]x);
    $targetable{$key} = [$t, $with_size, $arg, $sarg] if $t;
  }

  my $END = "!End!\n\n";		# "impossible" keyword (multiple newline)

  # Match an XS keyword
  $BLOCK_re= '\s*(' . join('|', qw(
				   REQUIRE BOOT CASE PREINIT INPUT INIT CODE PPCODE OUTPUT
				   CLEANUP ALIAS ATTRS PROTOTYPES PROTOTYPE VERSIONCHECK INCLUDE
				   SCOPE INTERFACE INTERFACE_MACRO C_ARGS POSTCALL OVERLOAD FALLBACK
				  )) . "|$END)\\s*:";

  
  our ($C_group_rex, $C_arg);
  # Group in C (no support for comments or literals)
  $C_group_rex = qr/ [({\[]
		       (?: (?> [^()\[\]{}]+ ) | (??{ $C_group_rex }) )*
		       [)}\]] /x ;
  # Chunk in C without comma at toplevel (no comments):
  $C_arg = qr/ (?: (?> [^()\[\]{},"']+ )
	     |   (??{ $C_group_rex })
	     |   " (?: (?> [^\\"]+ )
		   |   \\.
		   )* "		# String literal
			    |   ' (?: (?> [^\\']+ ) | \\. )* ' # Char literal
	     )* /xs;
  
  # Identify the version of xsubpp used
  print <<EOM ;
/*
 * This file was generated automatically by ExtUtils::ParseXS version $VERSION from the
 * contents of $filename. Do not edit this file, edit $filename instead.
 *
 *	ANY CHANGES MADE HERE WILL BE LOST! 
 *
 */

EOM


  print("#line 1 \"$filepathname\"\n")
    if $WantLineNumbers;

  firstmodule:
  while (<$FH>) {
    if (/^=/) {
      my $podstartline = $.;
      do {
	if (/^=cut\s*$/) {
	  # We can't just write out a /* */ comment, as our embedded
	  # POD might itself be in a comment. We can't put a /**/
	  # comment inside #if 0, as the C standard says that the source
	  # file is decomposed into preprocessing characters in the stage
	  # before preprocessing commands are executed.
	  # I don't want to leave the text as barewords, because the spec
	  # isn't clear whether macros are expanded before or after
	  # preprocessing commands are executed, and someone pathological
	  # may just have defined one of the 3 words as a macro that does
	  # something strange. Multiline strings are illegal in C, so
	  # the "" we write must be a string literal. And they aren't
	  # concatenated until 2 steps later, so we are safe.
	  #     - Nicholas Clark
	  print("#if 0\n  \"Skipped embedded POD.\"\n#endif\n");
	  printf("#line %d \"$filepathname\"\n", $. + 1)
	    if $WantLineNumbers;
	  next firstmodule
	}
	

t/lib/ExtUtils/ParseXS.pm  view on Meta::CPAN

	@args = split(/\s*,\s*/, $orig_args);
	Warn("Warning: cannot parse argument list '$orig_args', fallback to split");
      }
    } else {
      @args = split(/\s*,\s*/, $orig_args);
      for (@args) {
	if ($process_inout and s/^(IN|IN_OUTLIST|OUTLIST|IN_OUT|OUT)\s+//) {
	  my $out_type = $1;
	  next if $out_type eq 'IN';
	  $only_C_inlist{$_} = 1 if $out_type eq "OUTLIST";
	  push @outlist, $name if $out_type =~ /OUTLIST$/;
	  $in_out{$_} = $out_type;
	}
      }
    }
    if (defined($class)) {
      my $arg0 = ((defined($static) or $func_name eq 'new')
		  ? "CLASS" : "THIS");
      unshift(@args, $arg0);
      ($report_args = "$arg0, $report_args") =~ s/^\w+, $/$arg0/;
    }
    my $extra_args = 0;
    @args_num = ();
    $num_args = 0;
    my $report_args = '';
    foreach my $i (0 .. $#args) {
      if ($args[$i] =~ s/\.\.\.//) {
	$elipsis = 1;
	if ($args[$i] eq '' && $i == $#args) {
	  $report_args .= ", ...";
	  pop(@args);
	  last;
	}
      }
      if ($only_C_inlist{$args[$i]}) {
	push @args_num, undef;
      } else {
	push @args_num, ++$num_args;
	$report_args .= ", $args[$i]";
      }
      if ($args[$i] =~ /^([^=]*[^\s=])\s*=\s*(.*)/s) {
	$extra_args++;
	$args[$i] = $1;
	$defaults{$args[$i]} = $2;
	$defaults{$args[$i]} =~ s/"/\\"/g;
      }
      $proto_arg[$i+1] = '$' ;
    }
    $min_args = $num_args - $extra_args;
    $report_args =~ s/"/\\"/g;
    $report_args =~ s/^,\s+//;
    my @func_args = @args;
    shift @func_args if defined($class);

    for (@func_args) {
      s/^/&/ if $in_out{$_};
    }
    $func_args = join(", ", @func_args);
    @args_match{@args} = @args_num;

    $PPCODE = grep(/^\s*PPCODE\s*:/, @line);
    $CODE = grep(/^\s*CODE\s*:/, @line);
    # Detect CODE: blocks which use ST(n)= or XST_m*(n,v)
    #   to set explicit return values.
    $EXPLICIT_RETURN = ($CODE &&
			("@line" =~ /(\bST\s*\([^;]*=) | (\bXST_m\w+\s*\()/x ));
    $ALIAS  = grep(/^\s*ALIAS\s*:/,  @line);
    $INTERFACE  = grep(/^\s*INTERFACE\s*:/,  @line);

    $xsreturn = 1 if $EXPLICIT_RETURN;

    $externC = $externC ? qq[extern "C"] : "";

    # print function header
    print Q(<<"EOF");
#$externC
#XS(XS_${Full_func_name}); /* prototype to pass -Wmissing-prototypes */
#XS(XS_${Full_func_name})
#[[
##ifdef dVAR
#    dVAR; dXSARGS;
##else
#    dXSARGS;
##endif
EOF
    print Q(<<"EOF") if $ALIAS ;
#    dXSI32;
EOF
    print Q(<<"EOF") if $INTERFACE ;
#    dXSFUNCTION($ret_type);
EOF
    if ($elipsis) {
      $cond = ($min_args ? qq(items < $min_args) : 0);
    } elsif ($min_args == $num_args) {
      $cond = qq(items != $min_args);
    } else {
      $cond = qq(items < $min_args || items > $num_args);
    }

    print Q(<<"EOF") if $except;
#    char errbuf[1024];
#    *errbuf = '\0';
EOF

    if ($ALIAS)
      { print Q(<<"EOF") if $cond }
#    if ($cond)
#       Perl_croak(aTHX_ "Usage: %s(%s)", GvNAME(CvGV(cv)), "$report_args");
EOF
    else
      { print Q(<<"EOF") if $cond }
#    if ($cond)
#       Perl_croak(aTHX_ "Usage: %s(%s)", "$pname", "$report_args");
EOF
    
     # cv doesn't seem to be used, in most cases unless we go in 
     # the if of this else
     print Q(<<"EOF");
#    PERL_UNUSED_VAR(cv); /* -W */
EOF

    #gcc -Wall: if an xsub has PPCODE is used
    #it is possible none of ST, XSRETURN or XSprePUSH macros are used
    #hence `ax' (setup by dXSARGS) is unused
    #XXX: could breakup the dXSARGS; into dSP;dMARK;dITEMS
    #but such a move could break third-party extensions
    print Q(<<"EOF") if $PPCODE;
#    PERL_UNUSED_VAR(ax); /* -Wall */
EOF

    print Q(<<"EOF") if $PPCODE;
#    SP -= items;
EOF

    # Now do a block of some sort.

    $condnum = 0;
    $cond = '';			# last CASE: condidional
    push(@line, "$END:");
    push(@line_no, $line_no[-1]);
    $_ = '';
    &check_cpp;
    while (@line) {
      &CASE_handler if check_keyword("CASE");
      print Q(<<"EOF");
#   $except [[
EOF

      # do initialization of input variables
      $thisdone = 0;
      $retvaldone = 0;
      %deferred;
      %arg_list = () ;
      $gotRETVAL = 0;
	
      INPUT_handler() ;
      process_keyword("INPUT|PREINIT|INTERFACE_MACRO|C_ARGS|ALIAS|ATTRS|PROTOTYPE|SCOPE|OVERLOAD") ;

      print Q(<<"EOF") if $ScopeThisXSUB;
#   ENTER;
#   [[
EOF
	
      if (!$thisdone && defined($class)) {
	if (defined($static) or $func_name eq 'new') {
	  print "\tchar *";
	  $var_types{"CLASS"} = "char *";
	  &generate_init("char *", 1, "CLASS");
	}
	else {
	  print "\t$class *";
	  $var_types{"THIS"} = "$class *";
	  &generate_init("$class *", 1, "THIS");
	}
      }
      
      # do code
      if (/^\s*NOT_IMPLEMENTED_YET/) {
	print "\n\tPerl_croak(aTHX_ \"$pname: not implemented yet\");\n";
	$_ = '' ;
      } else {
	if ($ret_type ne "void") {
	  print "\t" . &map_type($ret_type, 'RETVAL') . ";\n"
	    if !$retvaldone;
	  $args_match{"RETVAL"} = 0;
	  $var_types{"RETVAL"} = $ret_type;
	  print "\tdXSTARG;\n"
	    if $WantOptimize and $targetable{$type_kind{$ret_type}};
	}
	
	if (@fake_INPUT or @fake_INPUT_pre) {
	  unshift @line, @fake_INPUT_pre, @fake_INPUT, $_;
	  $_ = "";
	  $processing_arg_with_types = 1;
	  INPUT_handler() ;
	}
	print delete $deferred{post_input};
	
        process_keyword("INIT|ALIAS|ATTRS|PROTOTYPE|INTERFACE_MACRO|INTERFACE|C_ARGS|OVERLOAD") ;
	
	print delete $deferred{pre_call};
	print delete $deferred{auto_length_init};

	if (check_keyword("PPCODE")) {
	  print_section();
	  death ("PPCODE must be last thing") if @line;
	  print "\tLEAVE;\n" if $ScopeThisXSUB;
	  print "\tPUTBACK;\n\treturn;\n";
	} elsif (check_keyword("CODE")) {
	  print_section() ;
	} elsif (defined($class) and $func_name eq "DESTROY") {
	  print "\n\t";
	  print "delete THIS;\n";
	} else {
	  print "\n\t";
	  if ($ret_type ne "void") {
	    print "RETVAL = ";
	    $wantRETVAL = 1;
	  }
	  if (defined($static)) {
	    if ($func_name eq 'new') {
	      $func_name = "$class";
	    } else {
	      print "${class}::";
	    }
	  } elsif (defined($class)) {
	    if ($func_name eq 'new') {
	      $func_name .= " $class";
	    } else {
	      print "THIS->";
	    }
	  }
	  $func_name =~ s/^\Q$args{'s'}//
	    if exists $args{'s'};
	  $func_name = 'XSFUNCTION' if $interface;
	  print "$func_name($func_args);\n";
	}
      }
      
      # do output variables
      $gotRETVAL = 0;		# 1 if RETVAL seen in OUTPUT section;
      undef $RETVAL_code ;	# code to set RETVAL (from OUTPUT section);
      # $wantRETVAL set if 'RETVAL =' autogenerated
      ($wantRETVAL, $ret_type) = (0, 'void') if $RETVAL_no_return;
      undef %outargs ;
      process_keyword("POSTCALL|OUTPUT|ALIAS|ATTRS|PROTOTYPE|OVERLOAD");
      
      &generate_output($var_types{$_}, $args_match{$_}, $_, $DoSetMagic)
	for grep $in_out{$_} =~ /OUT$/, keys %in_out;
      
      # all OUTPUT done, so now push the return value on the stack
      if ($gotRETVAL && $RETVAL_code) {
	print "\t$RETVAL_code\n";
      } elsif ($gotRETVAL || $wantRETVAL) {
	my $t = $WantOptimize && $targetable{$type_kind{$ret_type}};
	my $var = 'RETVAL';
	my $type = $ret_type;
	
	# 0: type, 1: with_size, 2: how, 3: how_size
	if ($t and not $t->[1] and $t->[0] eq 'p') {
	  # PUSHp corresponds to setpvn.  Treate setpv directly
	  my $what = eval qq("$t->[2]");
	  warn $@ if $@;
	  
	  print "\tsv_setpv(TARG, $what); XSprePUSH; PUSHTARG;\n";
	  $prepush_done = 1;
	}
	elsif ($t) {
	  my $what = eval qq("$t->[2]");
	  warn $@ if $@;
	  
	  my $size = $t->[3];
	  $size = '' unless defined $size;
	  $size = eval qq("$size");
	  warn $@ if $@;
	  print "\tXSprePUSH; PUSH$t->[0]($what$size);\n";
	  $prepush_done = 1;
	}
	else {
	  # RETVAL almost never needs SvSETMAGIC()
	  &generate_output($ret_type, 0, 'RETVAL', 0);
	}
      }
      
      $xsreturn = 1 if $ret_type ne "void";
      my $num = $xsreturn;
      my $c = @outlist;
      print "\tXSprePUSH;" if $c and not $prepush_done;
      print "\tEXTEND(SP,$c);\n" if $c;
      $xsreturn += $c;
      generate_output($var_types{$_}, $num++, $_, 0, 1) for @outlist;
      
      # do cleanup
      process_keyword("CLEANUP|ALIAS|ATTRS|PROTOTYPE|OVERLOAD") ;
      
      print Q(<<"EOF") if $ScopeThisXSUB;
#   ]]
EOF
      print Q(<<"EOF") if $ScopeThisXSUB and not $PPCODE;
#   LEAVE;
EOF
      
      # print function trailer
      print Q(<<"EOF");
#    ]]
EOF
      print Q(<<"EOF") if $except;
#    BEGHANDLERS
#    CATCHALL
#	sprintf(errbuf, "%s: %s\\tpropagated", Xname, Xreason);
#    ENDHANDLERS
EOF
      if (check_keyword("CASE")) {
	blurt ("Error: No `CASE:' at top of function")
	  unless $condnum;
	$_ = "CASE: $_";	# Restore CASE: label
	next;
      }
      last if $_ eq "$END:";
      death(/^$BLOCK_re/o ? "Misplaced `$1:'" : "Junk at end of function");
      warn "internal error: deferred '$_' not consumed\n" for keys %deferred;
    }
    
    print Q(<<"EOF") if $except;
#    if (errbuf[0])
#	Perl_croak(aTHX_ errbuf);
EOF
    
    if ($xsreturn) {
      print Q(<<"EOF") unless $PPCODE;
#    XSRETURN($xsreturn);
EOF
    } else {
      print Q(<<"EOF") unless $PPCODE;
#    XSRETURN_EMPTY;
EOF
    }

    print Q(<<"EOF");
#]]
#
EOF

    my $newXS = "newXS" ;
    my $proto = "" ;
    
    # Build the prototype string for the xsub
    if ($ProtoThisXSUB) {
      $newXS = "newXSproto";
      
      if ($ProtoThisXSUB eq 2) {
	# User has specified empty prototype
      }
      elsif ($ProtoThisXSUB eq 1) {
	my $s = ';';
	if ($min_args < $num_args)  {
	  $s = '';
	  $proto_arg[$min_args] .= ";" ;
	}
	push @proto_arg, "$s\@"
	  if $elipsis ;
	
	$proto = join ("", grep defined, @proto_arg);
      }
      else {
	# User has specified a prototype
	$proto = $ProtoThisXSUB;
      }
      $proto = qq{, "$proto"};
    }
    
    if (%XsubAliases) {
      $XsubAliases{$pname} = 0
	unless defined $XsubAliases{$pname} ;
      while ( ($name, $value) = each %XsubAliases) {
	push(@InitFileCode, Q(<<"EOF"));
#        cv = newXS(\"$name\", XS_$Full_func_name, file);
#        XSANY.any_i32 = $value ;
EOF
	push(@InitFileCode, Q(<<"EOF")) if $proto;
#        sv_setpv((SV*)cv$proto) ;
EOF
      }
    }
    elsif (@Attributes) {
      push(@InitFileCode, Q(<<"EOF"));
#        cv = newXS(\"$pname\", XS_$Full_func_name, file);
#        apply_attrs_string("$Package", cv, "@Attributes", 0);
EOF
    }
    elsif ($interface) {
      while ( ($name, $value) = each %Interfaces) {
	$name = "$Package\::$name" unless $name =~ /::/;
	push(@InitFileCode, Q(<<"EOF"));