v8/test/mjsunit/wasm/async-compile.js

// Copyright 2017 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: --wasm-async-compilation --expose-wasm --allow-natives-syntax

load("test/mjsunit/wasm/wasm-constants.js");
load("test/mjsunit/wasm/wasm-module-builder.js");

function assertCompiles(buffer) {
  return assertPromiseFulfills(WebAssembly.compile(buffer))
    .then(module => assertTrue(module instanceof WebAssembly.Module));
}

function assertCompileError(buffer) {
  return assertPromiseRejects(WebAssembly.compile(buffer))
    .then(ex => assertTrue(ex instanceof WebAssembly.CompileError));
}

let ok_buffer = (() => {
  var builder = new WasmModuleBuilder();
  builder.addFunction('f', kSig_i_v)
      .addBody([kExprI32Const, 42])
      .exportAs('f');
  return builder.toBuffer();
})();

// The OK buffer validates and can be made into a module.
assertTrue(WebAssembly.validate(ok_buffer));
let ok_module = new WebAssembly.Module(ok_buffer);
assertTrue(ok_module instanceof WebAssembly.Module);

// The bad buffer does not validate and cannot be made into a module.
let bad_buffer = new ArrayBuffer(0);
assertFalse(WebAssembly.validate(bad_buffer));
assertThrows(
    () => new WebAssembly.Module(bad_buffer), WebAssembly.CompileError);

const kNumCompiles = 3;

// TODO(wasm): Remove assertPromiseFulfills once top-level await is a thing.
assertPromiseFulfills(async function basicCompile() {
  // Three compilations of the OK module should succeed.
  for (var i = 0; i < kNumCompiles; i++) {
    await assertCompiles(ok_buffer);
  }

  // Three compilations of the bad module should fail.
  for (var i = 0; i < kNumCompiles; i++) {
    await assertCompileError(bad_buffer);
  }
}());

assertPromiseFulfills(async function badFunctionInTheMiddle() {
  // We had an error where an exception was generated by a background task and
  // later thrown in a foreground task. The handle to the exception died
  // between, since the HandleScope was left.
  // This test reproduced that error.
  let builder = new WasmModuleBuilder();
  let sig = builder.addType(kSig_i_v);
  for (var i = 0; i < 10; ++i) {
    builder.addFunction('a' + i, sig).addBody([kExprI32Const, 42]);
  }
  builder.addFunction('bad', sig).addBody([]);
  for (var i = 0; i < 10; ++i) {
    builder.addFunction('b' + i, sig).addBody([kExprI32Const, 42]);
  }
  let buffer = builder.toBuffer();
  await assertCompileError(buffer);
}());