[wasm] Serialization/Deserialization of compiled module

test/mjsunit/wasm/compiled-module-serialization.js

+// Copyright 2015 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 --allow-natives-syntax --expose-gc
+
+load("test/mjsunit/wasm/wasm-constants.js");
+load("test/mjsunit/wasm/wasm-module-builder.js");
+
+(function SerializeAndDeserializeModule() {
+  var builder = new WasmModuleBuilder();
+  builder.addMemory(1,1, true);
+  var kSig_v_i = makeSig([kAstI32], []);
+  var signature = builder.addType(kSig_v_i);
+  builder.addImport("some_value", kSig_i);
+  builder.addImport("writer", signature);
+
+  builder.addFunction("main", kSig_i_i)
+    .addBody([
+      kExprI32Const, 1,
+      kExprGetLocal, 0,
+      kExprI32LoadMem, 0, 0,
+      kExprCallIndirect, kArity1, signature,
+      kExprGetLocal,0,
+      kExprI32LoadMem,0, 0,
+      kExprCallImport, kArity0, 0,
+      kExprI32Add
+    ]).exportFunc();
+
+  // writer(mem[i]);
+  // return mem[i] + some_value();
+  builder.addFunction("_wrap_writer", signature)
+    .addBody([
+      kExprGetLocal, 0,
+      kExprCallImport, kArity1, 1]);
+  builder.appendToTable([0, 1]);
+
+
+  var module = new WebAssembly.Module(builder.toBuffer());
+  var buff = %SerializeWasmModule(module);
+  module = null;
+  gc();
+  module = %DeserializeWasmModule(buff);
+
+  var mem_1 = new ArrayBuffer(4);
+  var view_1 = new Int32Array(mem_1);
+
+  view_1[0] = 42;
+
+  var outval_1;
+  var i1 = new WebAssembly.Instance(module, {some_value: () => 1,
+                                    writer: (x)=>outval_1 = x }, mem_1);
+
+  assertEquals(43, i1.exports.main(0));
+
+  assertEquals(42, outval_1);
+})();
+
+(function DeserializeInvalidObject() {
+  var invalid_buffer = new ArrayBuffer(10);
+
+  module = %DeserializeWasmModule(invalid_buffer);
+  assertEquals(module, undefined);
+})();
+
+(function RelationBetweenModuleAndClone() {
+  let builder = new WasmModuleBuilder();
+  builder.addFunction("main", kSig_i)
+    .addBody([kExprI8Const, 42])
+    .exportFunc();
+
+  var compiled_module = new WebAssembly.Module(builder.toBuffer());
+  var serialized = %SerializeWasmModule(compiled_module);
+  var clone = %DeserializeWasmModule(serialized);
+
+  assertNotNull(clone);
+  assertFalse(clone == undefined);
+  assertFalse(clone == compiled_module);
+  assertEquals(clone.constructor, compiled_module.constructor);
+})()