[m-rev.] diff: initialization function

[Zoltan Somogyi]

This has already been reviewed by Ralph.

Zoltan.

util/mkinit.c:
	Provide a mechanism that allows the user to specify that a certain
	function should always be executed on Mercury startup. This is intended
	to be used to initialize global variables that point to Mercury data.
	This is useful e.g. in constraint solvers, because it removes the need
	for the solver to check, on every access to its state, whether it has
	been initialized yet.

scripts/parse_ml_options-sh-subr.in:
scripts/c2init.in:
	Pass along the required option to mkinit.

scripts/Mmakefile:
	Provide a mechanism to automatically rebuild c2init and other
	configured files when ../config.status changes.

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Index: scripts/Mmakefile
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/scripts/Mmakefile,v
retrieving revision 1.35
diff -u -b -r1.35 Mmakefile
--- scripts/Mmakefile	17 Mar 2005 02:29:44 -0000	1.35
+++ scripts/Mmakefile	30 Apr 2005 06:54:11 -0000
@@ -23,12 +23,21 @@
 
 #-----------------------------------------------------------------------------#
 
-.SUFFIXES: .in
+# ensure there were no mispelt autoconf variable names \
 
-.in:
-	CONFIG_FILES=$@ CONFIG_HEADERS= $(MERCURY_DIR)/config.status
-	# check to ensure there were no mispelt autoconf variable names
-	if grep -n '[^$$]@' $@; then false; else true; fi
+# .SUFFIXES: .in
+
+# we test membership of SCRIPTS, because testing $(@D) (the directory part
+# of $*) does the wrong thing for Mercury.config. Not testing anything would
+# make this rule apply even to ../Mmake.common.
+
+%::	%.in $(MERCURY_DIR)/config.status
+	@for script in $(SCRIPTS) ; do \
+		if test "$*" = "$$script" ; then \
+		$(MERCURY_DIR)/config.status --file=$* ; \
+		if grep -n '[^$$]@' $@; then false; else true; fi \
+		fi \
+	done
 
 #-----------------------------------------------------------------------------#
 
Index: scripts/c2init.in
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/scripts/c2init.in,v
retrieving revision 1.45
diff -u -b -r1.45 c2init.in
--- scripts/c2init.in	15 Feb 2005 05:22:35 -0000	1.45
+++ scripts/c2init.in	30 Apr 2005 06:20:43 -0000
@@ -101,14 +101,15 @@
 	0) exec $MKINIT $aditi_opt -c"$maxcalls" $init_opt $trace_opt \
 		$library_opt $defentry_opt $extra_inits_opt \
 		-g "$GRADE" -o "$init_c_file" $experimental_complexity_opt \
-		$extra_init_dirs $EXTRA_INIT_FILES $TRACE_INIT_FILES \
-		$MERCURY_ALL_LIB_MODS
+		$extra_init_dirs $always_exec_init_opts \
+		$EXTRA_INIT_FILES $TRACE_INIT_FILES $MERCURY_ALL_LIB_MODS
 	   ;;
 	*) exec $MKINIT $aditi_opt -c"$maxcalls" $init_opt $trace_opt \
 		$library_opt $defentry_opt $extra_inits_opt \
 		-g "$GRADE" -o "$init_c_file" $experimental_complexity_opt \
 		-r "$runtime_flags" \
-		$extra_init_dirs "$@" $EXTRA_INIT_FILES $TRACE_INIT_FILES \
-		$MERCURY_ALL_LIB_MODS
+		$extra_init_dirs $always_exec_init_opts \
+		"$@" \
+		$EXTRA_INIT_FILES $TRACE_INIT_FILES $MERCURY_ALL_LIB_MODS
 	   ;;
 esac
Index: scripts/parse_ml_options.sh-subr.in
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/scripts/parse_ml_options.sh-subr.in,v
retrieving revision 1.9
diff -u -b -r1.9 parse_ml_options.sh-subr.in
--- scripts/parse_ml_options.sh-subr.in	15 Feb 2005 05:22:35 -0000	1.9
+++ scripts/parse_ml_options.sh-subr.in	30 Apr 2005 06:25:56 -0000
@@ -60,6 +60,7 @@
 library_opt=""
 extra_inits_opt=""
 aditi_opt=""
+always_exec_init_opts=""
 extra_init_dirs=""
 trace_init_files=""
 init_c_file="-"
@@ -195,6 +196,9 @@
 		Generate a function to upload Aditi-RL data to a database.
 		This option is needed when interfacing with the Aditi
 		deductive database system.
+	-A <funcname>
+		Always execute the named void function (which must take no
+		arguments) when the Mercury runtime is initialized.
 	-x, --extra-inits
 		Search \`.c' files for extra initialization functions.
 		(This may be necessary if the C files contain
@@ -419,6 +423,10 @@
 		aditi_opt="-a";;	
 	-a-|--no-aditi)
 		aditi_opt="";;	
+
+	-A)
+		always_exec_init_opts="$always_exec_init_opts -A $2"; shift;;
+
 	-c|--max-calls)
 		maxcalls="$2"; shift;;
 
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