feature.pl: Move hint-checking code up

This puts it with the other code that generates ‘global’ variables
used by generation code.

diff --git a/regen/feature.pl b/regen/feature.pl
index 914040e..b4ad36a 100755 (executable)
--- a/regen/feature.pl
+++ b/regen/feature.pl
@@ -79,6 +79,30 @@ for my $bund (
     }
 }
 
+my $HintShift;
+
+open "perl.h", "perl.h" or die "$0 cannot open perl.h: $!";
+perlh: {
+    while (readline "perl.h") {
+       next unless /#define\s+HINT_FEATURE_MASK/;
+       /(0x[A-Fa-f0-9]+)/ or die "No hex number in:\n\n$_\n ";
+       my $hex = $1;
+       my $bits = sprintf "%b", oct $1;
+       $bits =~ /^0*1+(0*)\z/
+        or die "Non-contiguous bits in $bits (binary for $hex):\n\n$_\n ";
+       $HintShift = length $1;
+       my $bits_needed =
+           length sprintf "%b", scalar keys %UniqueBundles;
+       $bits =~ /1{$bits_needed}/
+           or die "Not enough bits (need $bits_needed)"
+                . " in $bits (binary for $hex):\n\n$_\n";
+       last perlh;
+    }
+    die "No HINT_FEATURE_MASK defined in perl.h";
+}
+close "perl.h";
+
+
 ###########################################################################
 
 
@@ -140,29 +164,6 @@ while (<DATA>) {
 
 read_only_bottom_close_and_rename($pm);
 
-my $HintShift;
-
-open "perl.h", "perl.h" or die "$0 cannot open perl.h: $!";
-perlh: {
-    while (readline "perl.h") {
-       next unless /#define\s+HINT_FEATURE_MASK/;
-       /(0x[A-Fa-f0-9]+)/ or die "No hex number in:\n\n$_\n ";
-       my $hex = $1;
-       my $bits = sprintf "%b", oct $1;
-       $bits =~ /^0*1+(0*)\z/
-        or die "Non-contiguous bits in $bits (binary for $hex):\n\n$_\n ";
-       $HintShift = length $1;
-       my $bits_needed =
-           length sprintf "%b", scalar keys %UniqueBundles;
-       $bits =~ /1{$bits_needed}/
-           or die "Not enough bits (need $bits_needed)"
-                . " in $bits (binary for $hex):\n\n$_\n";
-       last perlh;
-    }
-    die "No HINT_FEATURE_MASK defined in perl.h";
-}
-close "perl.h";
-
 my $first_bit = sprintf "0x%08x", 1 << $HintShift;
 print $h <<EOH;