X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=build-aux%2Fuseless-if-before-free;h=b8f5a2635e89cf4246bedcbd3e0e4709947b6325;hb=4bf2b800b24ba0b0cfd069b8ec7ac173714c734d;hp=9f237d6c91fe0892d5462d34110948551d41f82c;hpb=a0e17c2bc3eebd9abe9967c7bdb5efdcd21253af;p=gnulib.git

diff --git a/build-aux/useless-if-before-free b/build-aux/useless-if-before-free
index 9f237d6c9..b8f5a2635 100755
--- a/build-aux/useless-if-before-free
+++ b/build-aux/useless-if-before-free
@@ -1,14 +1,16 @@
-#!/usr/bin/perl -T
+eval '(exit $?0)' && eval 'exec perl -wST "$0" ${1+"$@"}'
+  & eval 'exec perl -wST "$0" $argv:q'
+    if 0;
 # Detect instances of "if (p) free (p);".
-# Likewise for "if (p != NULL) free (p);".  And with braces.
+# Likewise "if (p != 0)", "if (0 != p)", or with NULL; and with braces.
 
-my $VERSION = '2008-05-25 16:16'; # UTC
+my $VERSION = '2011-04-20 13:43'; # UTC
 # The definition above must lie within the first 8 lines in order
 # for the Emacs time-stamp write hook (at end) to update it.
 # If you change this file with Emacs, please let the write hook
 # do its job.  Otherwise, update this string manually.
 
-# Copyright (C) 2008 Free Software Foundation, Inc.
+# Copyright (C) 2008-2011 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -59,8 +61,8 @@ detect free-like functions named FOO and BAR.
 
 OPTIONS:
 
-   --list       print only the name of each matching FILE (\0-terminated)
-   --name=N     add name N to the list of `free'-like functions to detect;
+   --list       print only the name of each matching FILE (\\0-terminated)
+   --name=N     add name N to the list of \`free\'-like functions to detect;
                   may be repeated
 
    --help       display this help and exit
@@ -84,6 +86,12 @@ EOF
   exit $exit_code;
 }
 
+sub is_NULL ($)
+{
+  my ($expr) = @_;
+  return ($expr eq 'NULL' || $expr eq '0');
+}
+
 {
   sub EXIT_MATCH {0}
   sub EXIT_NO_MATCH {1}
@@ -122,14 +130,32 @@ EOF
       while (defined (my $line = <FH>))
         {
           while ($line =~
-              /\b(if\s*\(\s*(?:\S+?)(?:\s*!=\s*NULL)?\s*\)
-               (?:   \s*$regexp\s*\((?:\s*\([^)]+\))?\s*\1\s*\)|
-                \s*\{\s*$regexp\s*\((?:\s*\([^)]+\))?\s*\1\s*\)\s*;\s*\}))/sxg)
+              /\b(if\s*\(\s*([^)]+?)(?:\s*!=\s*([^)]+?))?\s*\)
+              #  1          2                  3
+               (?:   \s*$regexp\s*\((?:\s*\([^)]+\))?\s*([^)]+)\)\s*;|
+                \s*\{\s*$regexp\s*\((?:\s*\([^)]+\))?\s*([^)]+)\)\s*;\s*\}))/sxg)
             {
-              $found_match = 1;
-              $list
-                and (print "$file\0"), next FILE;
-              print "$file: $1\n";
+              my $all = $1;
+              my ($lhs, $rhs) = ($2, $3);
+              my ($free_opnd, $braced_free_opnd) = ($4, $5);
+              my $non_NULL;
+              if (!defined $rhs) { $non_NULL = $lhs }
+              elsif (is_NULL $rhs) { $non_NULL = $lhs }
+              elsif (is_NULL $lhs) { $non_NULL = $rhs }
+              else { next }
+
+              # Compare the non-NULL part of the "if" expression and the
+              # free'd expression, without regard to white space.
+              $non_NULL =~ tr/ \t//d;
+              my $e2 = defined $free_opnd ? $free_opnd : $braced_free_opnd;
+              $e2 =~ tr/ \t//d;
+              if ($non_NULL eq $e2)
+                {
+                  $found_match = 1;
+                  $list
+                    and (print "$file\0"), next FILE;
+                  print "$file: $all\n";
+                }
             }
         }
     }
@@ -149,12 +175,20 @@ my $foo = <<'EOF';
 # This adjusts them, removing the unnecessary "if (p)" part.
 
 # FIXME: do something like this as an option (doesn't do braces):
-useless-if-before-free -l $(lid -knone free) | xargs -0 \
-  perl -0x3b -pi -e \
-   's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)\s+(free\s*\((?:\s*\([^)]+\))?\s*\1\s*\))/$2/s'
-
-# Or, with git:
-git ls-files -z |xargs -0 perl -0x3b -pi -e '...'
+free=xfree
+git grep -l -z "$free *(" \
+  | xargs -0 useless-if-before-free -l --name="$free" \
+  | xargs -0 perl -0x3b -pi -e \
+   's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*(?:0|NULL))?\s*\)\s+('"$free"'\s*\((?:\s*\([^)]+\))?\s*\1\s*\)\s*;)/$2/s'
+
+# Use the following to remove redundant uses of kfree inside braces.
+# Note that -0777 puts perl in slurp-whole-file mode;
+# but we have plenty of memory, these days...
+free=kfree
+git grep -l -z "$free *(" \
+  | xargs -0 useless-if-before-free -l --name="$free" \
+  | xargs -0 perl -0777 -pi -e \
+     's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*(?:0|NULL))?\s*\)\s*\{\s*('"$free"'\s*\((?:\s*\([^)]+\))?\s*\1\s*\);)\s*\}[^\n]*$/$2/gms'
 
 Be careful that the result of the above transformation is valid.
 If the matched string is followed by "else", then obviously, it won't be.
@@ -163,6 +197,7 @@ When modifying files, refuse to process anything other than a regular file.
 EOF
 
 ## Local Variables:
+## mode: perl
 ## indent-tabs-mode: nil
 ## eval: (add-hook 'write-file-hooks 'time-stamp)
 ## time-stamp-start: "my $VERSION = '"