Revert "Merge pull request #304 from swiftwasm/yt/remove-cdecls"

This reverts commit 1de7acc, reversing
changes made to e36e93c.

Author: kateinoigakukun

Diff for: Examples/Embedded/Sources/EmbeddedApp/_thingsThatShouldNotBeNeeded.swift

@@ -1,5 +1,12 @@
 import JavaScriptKit
 
+// NOTE: it seems the embedded tree shaker gets rid of these exports if they are not used somewhere
+func _i_need_to_be_here_for_wasm_exports_to_work() {
+    _ = _swjs_library_features
+    _ = _swjs_call_host_function
+    _ = _swjs_free_host_function
+}
+
 // TODO: why do I need this? and surely this is not ideal... figure this out, or at least have this come from a C lib
 @_cdecl("strlen")
 func strlen(_ s: UnsafePointer<Int8>) -> Int {

Diff for: Runtime/src/index.ts

@@ -56,6 +56,14 @@ export class SwiftRuntime {
                 `
             );
         }
+        if (this.exports.swjs_library_version() != this.version) {
+            throw new Error(
+                `The versions of JavaScriptKit are incompatible.
+                WebAssembly runtime ${this.exports.swjs_library_version()} != JS runtime ${
+                    this.version
+                }`
+            );
+        }
     }
 
     main() {

Diff for: Runtime/src/types.ts

@@ -7,6 +7,7 @@ export type JavaScriptValueKind = number;
 export type JavaScriptValueKindAndFlags = number;
 
 export interface ExportedFunctions {
+    swjs_library_version(): number;
     swjs_library_features(): number;
     swjs_prepare_host_function_call(size: number): pointer;
     swjs_cleanup_host_function_call(argv: pointer): void;

Diff for: Sources/JavaScriptKit/Features.swift

@@ -2,13 +2,17 @@ enum LibraryFeatures {
     static let weakRefs: Int32 = 1 << 0
 }
 
-@_expose(wasm, "swjs_library_features")
-@_cdecl("_swjs_library_features")
-@available(*, unavailable)
-public func _swjs_library_features() -> Int32 {
+@_cdecl("_library_features")
+func _library_features() -> Int32 {
     var features: Int32 = 0
 #if !JAVASCRIPTKIT_WITHOUT_WEAKREFS
     features |= LibraryFeatures.weakRefs
 #endif
     return features
 }
+
+#if compiler(>=6.0) && hasFeature(Embedded)
+// cdecls currently don't work in embedded, and expose for wasm only works >=6.0
+@_expose(wasm, "swjs_library_features")
+public func _swjs_library_features() -> Int32 { _library_features() }
+#endif

Diff for: Sources/JavaScriptKit/FundamentalObjects/JSClosure.swift

@@ -197,10 +197,8 @@ private func makeAsyncClosure(
 // └─────────────────────┴──────────────────────────┘
 
 /// Returns true if the host function has been already released, otherwise false.
-@_expose(wasm, "swjs_call_host_function")
-@_cdecl("_swjs_call_host_function")
-@available(*, unavailable)
-public func _swjs_call_host_function(
+@_cdecl("_call_host_function_impl")
+func _call_host_function_impl(
     _ hostFuncRef: JavaScriptHostFuncRef,
     _ argv: UnsafePointer<RawJSValue>, _ argc: Int32,
     _ callbackFuncRef: JavaScriptObjectRef
@@ -233,10 +231,9 @@ extension JSClosure {
     }
 }
 
-@_expose(wasm, "swjs_free_host_function")
-@_cdecl("_swjs_free_host_function")
-@available(*, unavailable)
-func _swjs_free_host_function(_ hostFuncRef: JavaScriptHostFuncRef) {}
+
+@_cdecl("_free_host_function_impl")
+func _free_host_function_impl(_ hostFuncRef: JavaScriptHostFuncRef) {}
 
 #else
 
@@ -247,10 +244,25 @@ extension JSClosure {
 
 }
 
-@_expose(wasm, "swjs_free_host_function")
-@_cdecl("_swjs_free_host_function")
-@available(*, unavailable)
-func _swjs_free_host_function(_ hostFuncRef: JavaScriptHostFuncRef) {
+@_cdecl("_free_host_function_impl")
+func _free_host_function_impl(_ hostFuncRef: JavaScriptHostFuncRef) {
     JSClosure.sharedClosures.wrappedValue[hostFuncRef] = nil
 }
 #endif
+
+#if compiler(>=6.0) && hasFeature(Embedded)
+// cdecls currently don't work in embedded, and expose for wasm only works >=6.0
+@_expose(wasm, "swjs_call_host_function")
+public func _swjs_call_host_function(
+        _ hostFuncRef: JavaScriptHostFuncRef,
+        _ argv: UnsafePointer<RawJSValue>, _ argc: Int32,
+        _ callbackFuncRef: JavaScriptObjectRef) -> Bool {
+
+    _call_host_function_impl(hostFuncRef, argv, argc, callbackFuncRef) 
+}
+
+@_expose(wasm, "swjs_free_host_function")
+public func _swjs_free_host_function(_ hostFuncRef: JavaScriptHostFuncRef) {
+    _free_host_function_impl(hostFuncRef)
+}
+#endif

Diff for: Sources/JavaScriptKit/Runtime/index.js

@@ -13,6 +13,13 @@ extern void *memcpy (void *__restrict, const void *__restrict, size_t);
 #include <stdbool.h>
 
 #endif
+/// 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 swjs_library_version(void) {
+    return 708;
+}
 
 __attribute__((export_name("swjs_prepare_host_function_call")))
 void *swjs_prepare_host_function_call(const int argc) {
@@ -28,6 +35,31 @@ void swjs_cleanup_host_function_call(void *argv_buffer) {
 // cdecls don't work in Embedded, but @_expose(wasm) can be used with Swift >=6.0
 // the previously used `#if __Embedded` did not play well with SwiftPM (defines needed to be on every target up the chain)
 #ifdef __wasi__
+bool _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")))
+bool swjs_call_host_function(const JavaScriptHostFuncRef host_func_ref,
+                             const RawJSValue *argv, const int argc,
+                             const JavaScriptObjectRef callback_func) {
+    return _call_host_function_impl(host_func_ref, argv, argc, callback_func);
+}
+
+void _free_host_function_impl(const JavaScriptHostFuncRef host_func_ref);
+
+__attribute__((export_name("swjs_free_host_function")))
+void swjs_free_host_function(const JavaScriptHostFuncRef host_func_ref) {
+    _free_host_function_impl(host_func_ref);
+}
+
+int _library_features(void);
+
+__attribute__((export_name("swjs_library_features")))
+int swjs_library_features(void) {
+    return _library_features();
+}
+
 int swjs_get_worker_thread_id_cached(void) {
     _Thread_local static int tid = 0;
     if (tid == 0) {