Rationalize order of input files for gen_node_support.pl.

Per a question from Andres Freund.  While here, also make the
list of nodetag-only files easier to compare to the full list
of input files.

Discussion: https://postgr.es/m/20220710214622.haiektrjzisob6rl@awork3.anarazel.de

Author: tglsfdc

src/backend/nodes/Makefile

@@ -33,27 +33,31 @@ OBJS = \
 
 include $(top_srcdir)/src/backend/common.mk
 
+# The principal node-defining headers are listed in their inclusion order,
+# to ensure cross-file subtyping works correctly.  The rest can just be
+# listed alphabetically.
+# Caution: re-ordering this list risks ABI breakage!
 node_headers = \
 	nodes/nodes.h \
-	nodes/execnodes.h \
-	nodes/plannodes.h \
 	nodes/primnodes.h \
-	nodes/pathnodes.h \
-	nodes/extensible.h \
 	nodes/parsenodes.h \
-	nodes/replnodes.h \
-	nodes/value.h \
-	commands/trigger.h \
-	commands/event_trigger.h \
-	foreign/fdwapi.h \
+	nodes/pathnodes.h \
+	nodes/plannodes.h \
+	nodes/execnodes.h \
 	access/amapi.h \
+	access/sdir.h \
 	access/tableam.h \
 	access/tsmapi.h \
-	utils/rel.h \
-	nodes/supportnodes.h \
+	commands/event_trigger.h \
+	commands/trigger.h \
 	executor/tuptable.h \
+	foreign/fdwapi.h \
+	nodes/extensible.h \
 	nodes/lockoptions.h \
-	access/sdir.h
+	nodes/replnodes.h \
+	nodes/supportnodes.h \
+	nodes/value.h \
+	utils/rel.h
 
 # see also catalog/Makefile for an explanation of these make rules
 

src/backend/nodes/gen_node_support.pl

@@ -95,6 +95,22 @@ sub elem
 # currently not required.
 push @scalar_types, qw(QualCost);
 
+# Nodes from these input files don't need support functions, just node tags.
+my @nodetag_only_files = qw(
+  nodes/execnodes.h
+  access/amapi.h
+  access/sdir.h
+  access/tableam.h
+  access/tsmapi.h
+  commands/event_trigger.h
+  commands/trigger.h
+  executor/tuptable.h
+  foreign/fdwapi.h
+  nodes/lockoptions.h
+  nodes/replnodes.h
+  nodes/supportnodes.h
+);
+
 # XXX various things we are not publishing right now to stay level
 # with the manual system
 push @no_copy,  qw(CallContext InlineCodeBlock);
@@ -133,6 +149,9 @@ sub elem
 
 	open my $ifh, '<', $infile or die "could not open \"$infile\": $!";
 
+	# now shorten filename for use below
+	$infile =~ s!.*src/include/!!;
+
 	my $raw_file_content = do { local $/; <$ifh> };
 
 	# strip C comments, preserving newlines so we can count lines correctly
@@ -295,12 +314,8 @@ sub elem
 					$node_type_info{$in_struct}->{field_types} = \%ft;
 					$node_type_info{$in_struct}->{field_attrs} = \%fa;
 
-					# Nodes from these files don't need support functions,
-					# just node tags.
-					if (elem basename($infile),
-						qw(execnodes.h trigger.h event_trigger.h amapi.h tableam.h
-						tsmapi.h fdwapi.h tuptable.h replnodes.h supportnodes.h)
-					  )
+					# Exclude nodes in nodetag_only_files from support.
+					if (elem $infile, @nodetag_only_files)
 					{
 						push @no_copy,       $in_struct;
 						push @no_equal,      $in_struct;

src/tools/msvc/Solution.pm

@@ -843,29 +843,28 @@ EOF
 			'src/backend/nodes/node-support-stamp',
 			'src/backend/nodes/gen_node_support.pl'))
 	{
-		# XXX duplicates src/backend/nodes/Makefile
-
+		# XXX duplicates node_headers list in src/backend/nodes/Makefile
 		my @node_headers = qw(
 		  nodes/nodes.h
-		  nodes/execnodes.h
-		  nodes/plannodes.h
 		  nodes/primnodes.h
-		  nodes/pathnodes.h
-		  nodes/extensible.h
 		  nodes/parsenodes.h
-		  nodes/replnodes.h
-		  nodes/value.h
-		  commands/trigger.h
-		  commands/event_trigger.h
-		  foreign/fdwapi.h
+		  nodes/pathnodes.h
+		  nodes/plannodes.h
+		  nodes/execnodes.h
 		  access/amapi.h
+		  access/sdir.h
 		  access/tableam.h
 		  access/tsmapi.h
-		  utils/rel.h
-		  nodes/supportnodes.h
+		  commands/event_trigger.h
+		  commands/trigger.h
 		  executor/tuptable.h
+		  foreign/fdwapi.h
+		  nodes/extensible.h
 		  nodes/lockoptions.h
-		  access/sdir.h
+		  nodes/replnodes.h
+		  nodes/supportnodes.h
+		  nodes/value.h
+		  utils/rel.h
 		);
 
 		chdir('src/backend/nodes');