Pull in weval branch of SpiderMonkey and add build.

This pulls in a new bytecodealliance/gecko-dev commit hash with weval
support, and produces a new separate build of the engine with intrinsics
added so that we can apply the [weval](https://github.com/cfallin/weval)
tool to obtain speedups with AOT compilation/specialization.

This is a re-do of fastly#5, but with fixes from bytecodealliance/gecko-dev#5
applied.

.github/workflows/main.yml

@@ -31,11 +31,18 @@ jobs:
       run: |
         mkdir dist
         sudo apt-get update -y
-        bash ./build-engine.sh release
-        tar -a -cf dist/spidermonkey-wasm-static-lib_release.tar.gz release
-        rm -rf release obj-release
-        bash ./build-engine.sh debug
-        tar -a -cf dist/spidermonkey-wasm-static-lib_debug.tar.gz debug
+        bash ./build-engine.sh release normal
+        tar -a -cf dist/spidermonkey-wasm-static-lib_release_normal.tar.gz release-normal
+        rm -rf release-normal obj-release-normal
+        bash ./build-engine.sh release weval
+        tar -a -cf dist/spidermonkey-wasm-static-lib_release_weval.tar.gz release-weval
+        rm -rf release-weval obj-release-weval
+        bash ./build-engine.sh debug normal
+        tar -a -cf dist/spidermonkey-wasm-static-lib_debug_normal.tar.gz debug-normal
+        rm -rf debug-normal obj-debug-normal
+        bash ./build-engine.sh debug weval
+        tar -a -cf dist/spidermonkey-wasm-static-lib_debug_weval.tar.gz debug-weval
+        rm -rf debug-weval obj-debug-weval
 
     - name: Calculate tag name
       run: |

build-engine.sh

@@ -3,33 +3,44 @@
 set -euo pipefail
 set -x
 
+if (wasm-opt --version | grep -q "wasm-opt version" ); then
+    echo "wasm-opt corrupts the SpiderMonkey build; please remove it or alias it to /bin/true!"
+    exit 1
+fi
+
+if [ $# -lt 1 ]; then
+    echo "Usage: build.sh {release|debug} [{normal|weval}]"
+    exit 1
+fi
+
+if [ $# -eq 1 ]; then
+    $0 $1 normal
+    $0 $1 weval
+    exit 0
+fi
+
 working_dir="$(pwd)"
 script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
 
-mode="${1:-release}"
-mozconfig="${working_dir}/mozconfig-${mode}"
-objdir="obj-$mode"
-outdir="$mode"
-
-cat << EOF > "$mozconfig"
-ac_add_options --enable-project=js
-ac_add_options --enable-application=js
-ac_add_options --target=wasm32-unknown-wasi
-ac_add_options --without-system-zlib
-ac_add_options --without-intl-api
-ac_add_options --disable-jit
-ac_add_options --disable-shared-js
-ac_add_options --disable-shared-memory
-ac_add_options --disable-tests
-ac_add_options --disable-clang-plugin
-ac_add_options --enable-jitspew
-ac_add_options --enable-optimize
-ac_add_options --enable-js-streams
+# Mode: release or debug
+mode=$1
+# Variant: normal or weval
+variant=$2
+mozconfig="${working_dir}/mozconfig-${mode}-${variant}"
+objdir="obj-$mode-$variant"
+outdir="$mode-$variant"
+
+cat $script_dir/mozconfig.defaults > "$mozconfig"
+cat << EOF >> "$mozconfig"
 ac_add_options --prefix=${working_dir}/${objdir}/dist
 mk_add_options MOZ_OBJDIR=${working_dir}/${objdir}
 mk_add_options AUTOCLOBBER=1
 EOF
 
+if [ "$variant" == "weval" ]; then
+    cat $script_dir/mozconfig.weval >> "$mozconfig"
+fi
+
 target="$(uname)"
 case "$target" in
   Linux)

download-engine.sh

@@ -7,14 +7,11 @@ script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
 # # Get github repository url
 gh_url='https://github.'$(cd "$script_dir" && git remote get-url origin | cut -f2 -d. | tr ':' /)
 
-mode="release"
-if [[ $1 == "debug" ]]
-then
-  mode="debug"
-fi
+mode=${1:release}
+variant=${2:normal}
 
 git_rev="$(git -C "$script_dir" rev-parse HEAD)"
-file="spidermonkey-wasm-static-lib_${mode}.tar.gz"
+file="spidermonkey-wasm-static-lib_${mode}_${variant}.tar.gz"
 bundle_url="${gh_url}/releases/download/rev_${git_rev}/${file}"
 
 curl --fail -L -O "$bundle_url"

gecko-repository

@@ -1 +1 @@
-https://github.com/bytecodealliance/gecko-dev
+https://github.com/bytecodealliance/gecko-dev

gecko-revision

@@ -1 +1 @@
-69d3daaa3aa4589ac8e60a94c7c7e0592882d272
+f0dc4ca253349a4b8bd3bd253fa8421e76888326

mozconfig.defaults

@@ -0,0 +1,13 @@
+ac_add_options --enable-project=js
+ac_add_options --enable-application=js
+ac_add_options --target=wasm32-unknown-wasi
+ac_add_options --without-system-zlib
+ac_add_options --without-intl-api
+ac_add_options --disable-jit
+ac_add_options --disable-shared-js
+ac_add_options --disable-shared-memory
+ac_add_options --disable-tests
+ac_add_options --disable-clang-plugin
+ac_add_options --enable-jitspew
+ac_add_options --enable-optimize
+ac_add_options --enable-js-streams

mozconfig.weval

@@ -0,0 +1,3 @@
+ac_add_options --enable-js-interp-native-callstack
+ac_add_options --enable-js-interp-specialization
+ac_add_options --enable-js-interp-weval

rebuild.sh

@@ -3,33 +3,36 @@
 set -euo pipefail
 set -x
 
+if [ $# -lt 2 ]; then
+    echo "Usage: rebuild.sh {release|debug} {normal|weval}"
+    exit 1
+fi
+
+if (wasm-opt --version | grep -q "wasm-opt version" ); then
+    echo "wasm-opt corrupts the SpiderMonkey build; please remove it or alias it to /bin/true!"
+    exit 1
+fi
+
 working_dir="$(pwd)"
 script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
 
-mode="${1:-release}"
-mozconfig="${working_dir}/mozconfig-${mode}"
-objdir="obj-$mode"
-outdir="$mode"
-
-cat << EOF > "$mozconfig"
-ac_add_options --enable-project=js
-ac_add_options --enable-application=js
-ac_add_options --target=wasm32-unknown-wasi
-ac_add_options --without-system-zlib
-ac_add_options --without-intl-api
-ac_add_options --disable-jit
-ac_add_options --disable-shared-js
-ac_add_options --disable-shared-memory
-ac_add_options --disable-tests
-ac_add_options --disable-clang-plugin
-ac_add_options --enable-jitspew
-ac_add_options --enable-optimize
-ac_add_options --enable-js-streams
+mode=$1
+variant=$2
+mozconfig="${working_dir}/mozconfig-${mode}-${variant}"
+objdir="obj-$mode-$variant"
+outdir="$mode-$variant"
+
+cat $script_dir/mozconfig.defaults > "$mozconfig"
+cat << EOF >> "$mozconfig"
 ac_add_options --prefix=${working_dir}/${objdir}/dist
 mk_add_options MOZ_OBJDIR=${working_dir}/${objdir}
 mk_add_options AUTOCLOBBER=1
 EOF
 
+if [ "$variant" == "weval" ]; then
+    cat $script_dir/mozconfig.weval >> "$mozconfig"
+fi
+
 target="$(uname)"
 case "$target" in
   Linux)