Wasm: Wire the Wasm language module up to the build system.

This allows to configure the Wasm module, e.g

  ./configure wasm --include-path=/path/to/wasmtime-v11.0.0-x86_64-linux-c-api/include --lib-path=/path/to/wasmtime-v11.0.0-x86_64-linux-c-api/lib --rpath

--rpath as above says to set the rpath to the value of --lib-path. You
can alternatively specify a directory to use as the rpath. Or simply
omit the option to not have an rpath set.

This is mostly useful for during development where you may not have the
Wasmtime stuff installed to system directories or you want to test with
newer/different versions.

See ./configure wasm --help for a full list of options.

Reviewed-by: Alejandro Colomar <alx@nginx.com>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

3 files changed, 214 insertions, 0 deletions

diff --git a/auto/help b/auto/help
index f2307e9c..f3c42661 100644
--- a/auto/help
+++ b/auto/help
@@ -75,4 +75,7 @@ cat << END
   java OPTIONS         configure Java module
                        run "./configure java --help" to see available options
 
+  wasm OPTIONS	       configure WebAssembly module
+		       run "./configure wasm --help" to see available options
+
 END
diff --git a/auto/modules/conf b/auto/modules/conf
index 7e004703..31be751f 100644
--- a/auto/modules/conf
+++ b/auto/modules/conf
@@ -33,6 +33,10 @@ case "$nxt_module" in
        . auto/modules/java
    ;;
 
+   wasm)
+       . auto/modules/wasm
+   ;;
+
    *)
        echo
        echo $0: error: invalid module \"$nxt_module\".
diff --git a/auto/modules/wasm b/auto/modules/wasm
new file mode 100644
index 00000000..1f388de6
--- /dev/null
+++ b/auto/modules/wasm
@@ -0,0 +1,207 @@
+# Copyright (C) Andrew Clayton
+# Copyright (C) F5, Inc.
+
+
+NXT_WASM_RUNTIME=wasmtime
+
+shift
+
+for nxt_option; do
+
+    case "$nxt_option" in
+        -*=*) value=`echo "$nxt_option" | sed -e 's/[-_a-zA-Z0-9]*=//'`     ;;
+           *) value="" ;;
+    esac
+
+    case "$nxt_option" in
+
+        --runtime=*)		NXT_WASM_RUNTIME="$value"		    ;;
+        --module=*)		NXT_WASM_MODULE="$value"                    ;;
+        --include-path=*)	NXT_WASM_INCLUDE_PATH="$value"		    ;;
+        --lib-path=*)		NXT_WASM_LIB_PATH="$value"		    ;;
+        --rpath*)		NXT_WASM_RPATH="$value"			    ;;
+
+        --help)
+            cat << END
+
+    --runtime=RUNTIME		set the WASM runtime to use (default: wasmtime)
+    --module=NAME		set Unit WASM module name (default: wasm)
+    --include-path=DIRECTORY	set directory path to wasmtime includes
+    --lib-path=DIRECTORY	set directory path to libwasmtime.so library
+    --rpath[=DIRECTORY]		set the rpath (default: --lib-path)
+
+END
+            exit 0
+        ;;
+
+        *)
+            echo
+            echo $0: error: invalid wasm option \"$nxt_option\"
+            echo
+            exit 1
+        ;;
+    esac
+
+done
+
+
+if [ ! -f $NXT_AUTOCONF_DATA ]; then
+   echo
+   echo Please run common $0 before configuring module \"$nxt_module\".
+   echo
+   exit 1
+fi
+
+. $NXT_AUTOCONF_DATA
+
+NXT_WASM=wasm
+NXT_WASM_MODULE=${NXT_WASM_MODULE=${NXT_WASM##*/}}
+
+NXT_WASM_INCLUDE_PATH=${NXT_WASM_INCLUDE_PATH=}
+NXT_WASM_LIB_PATH=${NXT_WASM_LIB_PATH=}
+NXT_WASM_LDFLAGS=
+if [ "$NXT_WASM_RUNTIME" = "wasmtime" ]; then
+    NXT_WASM_LDFLAGS=-lwasmtime
+fi
+NXT_WASM_ADDITIONAL_FLAGS="-fno-strict-aliasing \
+ -Wno-missing-field-initializers \
+ -DNXT_HAVE_WASM_$(echo ${NXT_WASM_RUNTIME} | tr 'a-z' 'A-Z') \
+"
+
+# Set the RPATH/RUNPATH.
+#
+# We temporarily disable warning on unbound variables here as
+# NXT_WASM_RPATH may be legitimately unset, in which case we
+# don't set a RPATH.
+#
+# If NXT_WASM_RPATH is set but null then we set a RPATH of the
+# value of $NXT_WASM_LIB (--lib-path) otherwise use the value
+# provided.
+set +u
+if [ "${NXT_WASM_RPATH+set}" = set ]; then
+    if [ "$NXT_WASM_RPATH" = "" ]; then
+        NXT_WASM_RPATH=$NXT_WASM_LIB_PATH
+    fi
+
+    NXT_WASM_LDFLAGS="-Wl,-rpath,$NXT_WASM_RPATH $NXT_WASM_LDFLAGS"
+fi
+set -u
+
+$echo "configuring WASM module"
+$echo "configuring WASM module ..." >> $NXT_AUTOCONF_ERR
+
+nxt_found=no
+
+if [ "$NXT_WASM_RUNTIME" = "wasmtime" ]; then
+    nxt_feature="wasmtime"
+    nxt_feature_name=""
+    nxt_feature_run=no
+    nxt_feature_incs="-I${NXT_WASM_INCLUDE_PATH}"
+    nxt_feature_libs="-L${NXT_WASM_LIB_PATH} $NXT_WASM_LDFLAGS"
+    nxt_feature_test="
+        #include <wasm.h>
+        #include <wasi.h>
+        #include <wasmtime.h>
+
+        int main(void) {
+            wasm_config_t *c;
+
+            c = wasm_config_new();
+            wasm_config_delete(c);
+
+            return 0;
+        }"
+
+    . auto/feature
+fi
+
+if [ $nxt_found = no ]; then
+    $echo
+    $echo $0: error: no $NXT_WASM_RUNTIME found.
+    $echo
+    exit 1;
+fi
+
+
+if grep ^$NXT_WASM_MODULE: $NXT_MAKEFILE 2>&1 > /dev/null; then
+    $echo
+    $echo $0: error: duplicate \"$NXT_WASM_MODULE\" module configured.
+    $echo
+    exit 1;
+fi
+
+
+$echo " + WASM module: ${NXT_WASM_MODULE}.unit.so"
+
+. auto/cc/deps
+
+$echo >> $NXT_MAKEFILE
+
+NXT_WASM_MODULE_SRCS=" \
+    src/wasm/nxt_wasm.c \
+"
+
+if [ "$NXT_WASM_RUNTIME" = "wasmtime" ]; then
+    NXT_WASM_MODULE_SRCS="$NXT_WASM_MODULE_SRCS src/wasm/nxt_rt_wasmtime.c"
+fi
+
+
+# The wasm module object files.
+
+nxt_objs=$NXT_BUILD_DIR/src/nxt_unit.o
+
+for nxt_src in $NXT_WASM_MODULE_SRCS; do
+
+    nxt_obj=${nxt_src%.c}-$NXT_WASM_MODULE.o
+    nxt_dep=${nxt_src%.c}-$NXT_WASM_MODULE.dep
+    nxt_dep_flags=`nxt_gen_dep_flags`
+    nxt_dep_post=`nxt_gen_dep_post`
+    nxt_objs="$nxt_objs $NXT_BUILD_DIR/$nxt_obj"
+
+    cat << END >> $NXT_MAKEFILE
+
+$NXT_BUILD_DIR/$nxt_obj:	$nxt_src $NXT_VERSION_H
+	mkdir -p $NXT_BUILD_DIR/src/wasm
+	\$(CC) -c \$(CFLAGS) $NXT_WASM_ADDITIONAL_FLAGS \$(NXT_INCS) \\
+	    -I$NXT_WASM_INCLUDE_PATH \\
+	    $nxt_dep_flags \\
+	    -o $NXT_BUILD_DIR/$nxt_obj $nxt_src
+	$nxt_dep_post
+
+-include $NXT_BUILD_DIR/$nxt_dep
+
+END
+
+done
+
+
+cat << END >> $NXT_MAKEFILE
+
+.PHONY: ${NXT_WASM_MODULE}
+.PHONY: ${NXT_WASM_MODULE}-install
+.PHONY: ${NXT_WASM_MODULE}-uninstall
+
+all: ${NXT_WASM_MODULE}
+
+${NXT_WASM_MODULE}:	$NXT_BUILD_DIR/lib/unit/modules/${NXT_WASM_MODULE}.unit.so
+
+$NXT_BUILD_DIR/lib/unit/modules/${NXT_WASM_MODULE}.unit.so:	$nxt_objs
+	\$(NXT_MODULE_LINK) -o \$@ \\
+	    $nxt_objs -L${NXT_WASM_LIB_PATH} ${NXT_WASM_LDFLAGS} $NXT_LD_OPT
+
+
+install: ${NXT_WASM_MODULE}-install
+
+${NXT_WASM_MODULE}-install: ${NXT_WASM_MODULE} install-check
+	install -d \$(DESTDIR)$NXT_MODULESDIR
+	install -p $NXT_BUILD_DIR/lib/unit/modules/${NXT_WASM_MODULE}.unit.so \\
+		\$(DESTDIR)$NXT_MODULESDIR/
+
+
+uninstall: ${NXT_WASM_MODULE}-uninstall
+
+${NXT_WASM_MODULE}-uninstall:
+	rm -f \$(DESTDIR)$NXT_MODULESDIR/${NXT_WASM_MODULE}.unit.so
+	@rmdir -p \$(DESTDIR)$NXT_MODULESDIR 2>/dev/null || true
+
+END