[infra] Support Mac in pkg/dart2wasm/tool/run_benchmark

[email protected]

Change-Id: I4f0604468402437a3361269a244f9b32dd8969f2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/411302
Reviewed-by: Martin Kustermann <[email protected]>
Commit-Queue: Slava Egorov <[email protected]>

Author: mraleph

pkg/dart2wasm/tool/run_benchmark

@@ -26,8 +26,31 @@ SDK_DIR="$(cd "${PROG_DIR}/../../.." ; pwd -P)"
 
 RUN_WASM="$SDK_DIR/pkg/dart2wasm/bin/run_wasm.js"
 
-# Hardcoded to x64 Linux for now.
-D8_BIN="$SDK_DIR/third_party/d8/linux/x64/d8"
+function host_arch() {
+  # Use uname to determine the host architecture.
+  case `uname -m` in
+    x86_64)
+    echo "x64"
+    ;;
+    aarch64 | arm64 | armv8*)
+    echo "arm64"
+    ;;
+    *)
+    echo "Unsupported host architecture" `uname -m` >&2
+    exit 1
+    ;;
+  esac
+}
+
+function host_os() {
+  if [[ `uname` == 'Darwin' ]]; then
+    echo 'macos'
+  else
+    echo 'linux'
+  fi
+}
+
+D8_BIN="$SDK_DIR/third_party/d8/$(host_os)/$(host_arch)/d8"
 JSSHELL_BIN="$SDK_DIR/third_party/firefox_jsshell/js"
 JSC_BIN="$SDK_DIR/third_party/jsc/jsc"