diff --git a/mozilla/js/js2/tools/icode_query.pl b/mozilla/js/js2/tools/icode_query.pl
new file mode 100644
index 00000000000..32500fe72bb
--- /dev/null
+++ b/mozilla/js/js2/tools/icode_query.pl
@@ -0,0 +1,56 @@
+#!/usr/bin/perl
+#
+# The contents of this file are subject to the Netscape Public
+# License Version 1.1 (the "License"); you may not use this file
+# except in compliance with the License. You may obtain a copy of
+# the License at http://www.mozilla.org/NPL/
+#
+# Software distributed under the License is distributed on an "AS
+# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
+# implied. See the License for the specific language governing
+# rights and limitations under the License.
+#
+# The Original Code is JavaScript Core Tests.
+#
+# The Initial Developer of the Original Code is Netscape
+# Communications Corporation.  Portions created by Netscape are
+# Copyright (C) 1997-1999 Netscape Communications Corporation. All
+# Rights Reserved.
+#
+# Alternatively, the contents of this file may be used under the
+# terms of the GNU Public License (the "GPL"), in which case the
+# provisions of the GPL are applicable instead of those above.
+# If you wish to allow use of your version of this file only
+# under the terms of the GPL and not to allow others to use your
+# version of this file under the NPL, indicate your decision by
+# deleting the provisions above and replace them with the notice
+# and other provisions required by the GPL.  If you do not delete
+# the provisions above, a recipient may use your version of this
+# file under either the NPL or the GPL.
+#
+# Contributers:
+#
+
+use strict;
+use jsicodes;
+
+&query_types();
+
+sub query_types {
+    # shows types used by all icodes
+    my $k;
+    my %types;
+
+    for $k (sort(keys(%jsicodes::ops))) {
+        my $c = $jsicodes::ops{$k};
+        if ($c->{"params"}) {
+            my @params = @{$c->{"params"}};
+            my $p;
+            for $p (@params) {
+                $types{$p} = 1;
+            }
+        }
+    }
+    
+    print ("types used: " . join (", ", sort(keys(%types))) . "\n" );
+}
diff --git a/mozilla/js2/tools/icode_query.pl b/mozilla/js2/tools/icode_query.pl
new file mode 100644
index 00000000000..32500fe72bb
--- /dev/null
+++ b/mozilla/js2/tools/icode_query.pl
@@ -0,0 +1,56 @@
+#!/usr/bin/perl
+#
+# The contents of this file are subject to the Netscape Public
+# License Version 1.1 (the "License"); you may not use this file
+# except in compliance with the License. You may obtain a copy of
+# the License at http://www.mozilla.org/NPL/
+#
+# Software distributed under the License is distributed on an "AS
+# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
+# implied. See the License for the specific language governing
+# rights and limitations under the License.
+#
+# The Original Code is JavaScript Core Tests.
+#
+# The Initial Developer of the Original Code is Netscape
+# Communications Corporation.  Portions created by Netscape are
+# Copyright (C) 1997-1999 Netscape Communications Corporation. All
+# Rights Reserved.
+#
+# Alternatively, the contents of this file may be used under the
+# terms of the GNU Public License (the "GPL"), in which case the
+# provisions of the GPL are applicable instead of those above.
+# If you wish to allow use of your version of this file only
+# under the terms of the GPL and not to allow others to use your
+# version of this file under the NPL, indicate your decision by
+# deleting the provisions above and replace them with the notice
+# and other provisions required by the GPL.  If you do not delete
+# the provisions above, a recipient may use your version of this
+# file under either the NPL or the GPL.
+#
+# Contributers:
+#
+
+use strict;
+use jsicodes;
+
+&query_types();
+
+sub query_types {
+    # shows types used by all icodes
+    my $k;
+    my %types;
+
+    for $k (sort(keys(%jsicodes::ops))) {
+        my $c = $jsicodes::ops{$k};
+        if ($c->{"params"}) {
+            my @params = @{$c->{"params"}};
+            my $p;
+            for $p (@params) {
+                $types{$p} = 1;
+            }
+        }
+    }
+    
+    print ("types used: " . join (", ", sort(keys(%types))) . "\n" );
+}