[wasm] Allow import function to be any kind of callables.

src/runtime/runtime-test.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include <memory>
 
 #include "src/arguments.h"
 #include "src/deoptimizer.h"
@@ skipping 251 matching lines @@
 
   Local<v8::ObjectTemplate> desc = v8::ObjectTemplate::New(v8_isolate);
   desc->MarkAsUndetectable();
   Local<v8::Object> obj;
   if (!desc->NewInstance(v8_isolate->GetCurrentContext()).ToLocal(&obj)) {
     return nullptr;
   }
   return *Utils::OpenHandle(*obj);
 }
 
+static void call_as_function(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  double v1 = args[0]
+                  ->NumberValue(v8::Isolate::GetCurrent()->GetCurrentContext())
+                  .ToChecked();
+  double v2 = args[1]
+                  ->NumberValue(v8::Isolate::GetCurrent()->GetCurrentContext())
+                  .ToChecked();
+  args.GetReturnValue().Set(
+      v8::Number::New(v8::Isolate::GetCurrent(), v1 - v2));
+}
+
+// Returns a callable object. The object returns the difference of its two
+// parameters when it is called.
+RUNTIME_FUNCTION(Runtime_GetCallable) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 0);
+  v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
+  Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New(v8_isolate);
+  Local<ObjectTemplate> instance_template = t->InstanceTemplate();
+  instance_template->SetCallAsFunctionHandler(call_as_function);
+  v8_isolate->GetCurrentContext();
+  Local<v8::Object> instance =
+      t->GetFunction(v8_isolate->GetCurrentContext())
+          .ToLocalChecked()
+          ->NewInstance(v8_isolate->GetCurrentContext())
+          .ToLocalChecked();
+  return *Utils::OpenHandle(*instance);
+}
 
 RUNTIME_FUNCTION(Runtime_ClearFunctionTypeFeedback) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
   function->ClearTypeFeedbackInfo();
   Code* unoptimized = function->shared()->code();
   if (unoptimized->kind() == Code::FUNCTION) {
     unoptimized->ClearInlineCaches();
   }
@@ skipping 354 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_SpeciesProtector) {
   SealHandleScope shs(isolate);
   DCHECK_EQ(0, args.length());
   return isolate->heap()->ToBoolean(isolate->IsArraySpeciesLookupChainIntact());
 }
 
 
 }  // namespace internal
 }  // namespace v8