[wasm] Support anyref for external calls in interpreter.

This adds support for passing/returning reference type parameter/return
values when the interpreter is calling extern functions. It expands the
existing test coverage to the interpreter.

R=clemensh@chromium.org
TEST=mjsunit/wasm/anyref-interpreter,mjsunit/wasm/anyfunc-interpreter
BUG=v8:8091,v8:7581

Change-Id: I377e9d28aa36866c0441683ffd6a48160b721ec1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1559853Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60715}

src/wasm/wasm-interpreter.cc

@@ -3517,6 +3517,12 @@ class ThreadImpl {
         case kWasmF64:
           WriteUnalignedValue(address, arg.to<double>());
           break;
+        case kWasmAnyRef:
+        case kWasmAnyFunc:
+        case kWasmExceptRef:
+          DCHECK_EQ(kSystemPointerSize, param_size);
+          WriteUnalignedValue<Object>(address, *arg.to_anyref());
+          break;
         default:
           UNIMPLEMENTED();
       }
@@ -3588,6 +3594,13 @@ class ThreadImpl {
         case kWasmF64:
           Push(WasmValue(ReadUnalignedValue<double>(address)));
           break;
+        case kWasmAnyRef:
+        case kWasmAnyFunc:
+        case kWasmExceptRef: {
+          Handle<Object> ref(ReadUnalignedValue<Object>(address), isolate);
+          Push(WasmValue(ref));
+          break;
+        }
         default:
           UNIMPLEMENTED();
       }

test/mjsunit/wasm/anyfunc-interpreter.js

+// Copyright 2019 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.
+
+// Flags: --expose-wasm --experimental-wasm-anyref --expose-gc
+// Flags: --wasm-interpret-all
+
+// This is just a wrapper for an existing reference types test case that runs
+// with the --wasm-interpret-all flag added. If we ever decide to add a test
+// variant for this, then we can remove this file.
+
+load("test/mjsunit/wasm/anyfunc.js");

test/mjsunit/wasm/anyref-interpreter.js

+// Copyright 2019 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.
+
+// Flags: --expose-wasm --experimental-wasm-anyref --expose-gc
+// Flags: --wasm-interpret-all
+
+// This is just a wrapper for an existing reference types test case that runs
+// with the --wasm-interpret-all flag added. If we ever decide to add a test
+// variant for this, then we can remove this file.
+
+load("test/mjsunit/wasm/anyref.js");