Remove all unsafe linker flags from Package.swift

.github/workflows/test.yml

@@ -6,11 +6,6 @@ jobs:
     strategy:
       matrix:
         os: [macOS-10.15, Ubuntu-18.04]
-        include:
-          - os: macOS-10.15
-            toolchain: https://github.com/swiftwasm/swift/releases/download/swift-wasm-5.3-SNAPSHOT-2020-08-10-a/swift-wasm-5.3-SNAPSHOT-2020-08-10-a-osx.tar.gz
-          - os: Ubuntu-18.04
-            toolchain: https://github.com/swiftwasm/swift/releases/download/swift-wasm-5.3-SNAPSHOT-2020-08-10-a/swift-wasm-5.3-SNAPSHOT-2020-08-10-a-linux.tar.gz
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
@@ -23,8 +18,5 @@ jobs:
           export SWIFTENV_ROOT="$HOME/.swiftenv"
           export PATH="$SWIFTENV_ROOT/bin:$PATH"
           eval "$(swiftenv init -)"
-          swiftenv install $TOOLCHAIN_DOWNLOAD
           make bootstrap
           make test
-        env:
-          TOOLCHAIN_DOWNLOAD: ${{ matrix.toolchain }}

.swift-version

@@ -1 +1 @@
-wasm-5.3-SNAPSHOT-2020-08-10-a
+wasm-5.3-SNAPSHOT-2020-10-02-a

Makefile

@@ -2,6 +2,7 @@ MAKEFILE_DIR := $(dir $(lastword $(MAKEFILE_LIST)))
 
 .PHONY: bootstrap
 bootstrap:
+	./scripts/install-toolchain.sh
 	npm install
 
 .PHONY: build

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.3
+// swift-tools-version:5.2
 
 import PackageDescription
 
@@ -10,34 +10,8 @@ let package = Package(
     targets: [
         .target(
             name: "JavaScriptKit",
-            dependencies: ["_CJavaScriptKit"],
-            linkerSettings: [
-                .unsafeFlags(
-                    [
-                        "-Xlinker",
-                        "--export=swjs_call_host_function",
-                        "-Xlinker",
-                        "--export=swjs_prepare_host_function_call",
-                        "-Xlinker",
-                        "--export=swjs_cleanup_host_function_call",
-                        "-Xlinker",
-                        "--export=swjs_library_version",
-                    ],
-                    .when(platforms: [.wasi])
-                ),
-            ]
-        ),
-        .target(
-            name: "_CJavaScriptKit",
-            linkerSettings: [
-                .unsafeFlags(
-                    [
-                        "-Xlinker",
-                        "--allow-undefined",
-                    ],
-                    .when(platforms: [.wasi])
-                ),
-            ]
+            dependencies: ["_CJavaScriptKit"]
         ),
+        .target(name: "_CJavaScriptKit"),
     ]
 )

Sources/JavaScriptKit/FundamentalObjects/JSFunction.swift

@@ -190,19 +190,8 @@ public class JSClosure: JSFunction {
 // │                     │                          │
 // └─────────────────────┴──────────────────────────┘
 
-@_cdecl("swjs_prepare_host_function_call")
-func _prepare_host_function_call(_ argc: Int32) -> UnsafeMutableRawPointer {
-    let argumentSize = MemoryLayout<RawJSValue>.size * Int(argc)
-    return malloc(Int(argumentSize))!
-}
-
-@_cdecl("swjs_cleanup_host_function_call")
-func _cleanup_host_function_call(_ pointer: UnsafeMutableRawPointer) {
-    free(pointer)
-}
-
-@_cdecl("swjs_call_host_function")
-func _call_host_function(
+@_cdecl("_call_host_function_impl")
+func _call_host_function_impl(
     _ hostFuncRef: JavaScriptHostFuncRef,
     _ argv: UnsafePointer<RawJSValue>, _ argc: Int32,
     _ callbackFuncRef: JavaScriptObjectRef

Sources/_CJavaScriptKit/_CJavaScriptKit.c

@@ -0,0 +1,35 @@
+#include "_CJavaScriptKit.h"
+#include <stdlib.h>
+
+#if __wasm32__
+
+void _call_host_function_impl(const JavaScriptHostFuncRef host_func_ref,
+                              const RawJSValue *argv, const int argc,
+                              const JavaScriptObjectRef callback_func);
+
+__attribute__((export_name("swjs_call_host_function")))
+void _call_host_function(const JavaScriptHostFuncRef host_func_ref,
+                         const RawJSValue *argv, const int argc,
+                         const JavaScriptObjectRef callback_func) {
+    _call_host_function_impl(host_func_ref, argv, argc, callback_func);
+}
+
+__attribute__((export_name("swjs_prepare_host_function_call")))
+void *_prepare_host_function_call(const int argc) {
+    return malloc(argc * sizeof(RawJSValue));
+}
+
+__attribute__((export_name("swjs_cleanup_host_function_call")))
+void _cleanup_host_function_call(void *argv_buffer) {
+    free(argv_buffer);
+}
+
+/// The compatibility runtime library version.
+/// Notes: If you change any interface of runtime library, please increment
+/// this and `SwiftRuntime.version` in `./Runtime/src/index.ts`.
+__attribute__((export_name("swjs_library_version")))
+int _library_version() {
+    return 700;
+}
+
+#endif

scripts/install-toolchain.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+set -eu
+
+scripts_dir="$(cd "$(dirname $0)" && pwd)"
+
+swift_version="$(cat $scripts_dir/../.swift-version)"
+swift_tag="swift-$swift_version"
+
+if [ -z "$(which swiftenv)" ]; then
+  echo "swiftenv not installed, please install it before this script."
+  exit 1
+fi
+
+if [ ! -z "$(swiftenv versions | grep $swift_version)" ]; then
+  echo "$swift_version is already installed."
+  exit 0
+fi
+
+case $(uname -s) in
+  Darwin)
+    toolchain_download="$swift_tag-osx.tar.gz"
+  ;;
+  Linux)
+    if [ $(grep RELEASE /etc/lsb-release) == "DISTRIB_RELEASE=18.04" ]; then
+      toolchain_download="$swift_tag-ubuntu18.04.tar.gz"
+    elif [ $(grep RELEASE /etc/lsb-release) == "DISTRIB_RELEASE=20.04" ]; then
+      toolchain_download="$swift_tag-ubuntu20.04.tar.gz"
+    else
+      echo "Unknown Ubuntu version"
+      exit 1
+    fi
+  ;;
+  *)
+    echo "Unrecognised platform $(uname -s)"
+    exit 1
+  ;;
+esac
+
+toolchain_download_url="https://github.com/swiftwasm/swift/releases/download/$swift_tag/$toolchain_download"
+
+swiftenv install "$toolchain_download_url"