v8/test/mjsunit/wasm/gc-js-interop-helpers.js

// Copyright 2022 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.

// Helpers to test interoperability of Wasm objects in JavaScript.

d8.file.execute('test/mjsunit/wasm/wasm-module-builder.js');

function CreateWasmObjects() {
  let builder = new WasmModuleBuilder();
  let struct_type = builder.addStruct([makeField(kWasmI32, true)]);
  let array_type = builder.addArray(kWasmI32, true);
  builder.addFunction('MakeStruct', makeSig([], [kWasmExternRef]))
      .exportFunc()
      .addBody([
        kExprI32Const, 42,                       // --
        kGCPrefix, kExprStructNew, struct_type,  // --
        kGCPrefix, kExprExternExternalize        // --
      ]);
  builder.addFunction('MakeArray', makeSig([], [kWasmExternRef]))
      .exportFunc()
      .addBody([
        kExprI32Const, 2,                             // length
        kGCPrefix, kExprArrayNewDefault, array_type,  // --
        kGCPrefix, kExprExternExternalize             // --
      ]);

  let instance = builder.instantiate();
  return {
    struct: instance.exports.MakeStruct(),
    array: instance.exports.MakeArray(),
  };
}

function testThrowsRepeated(fn, ErrorType) {
  %PrepareFunctionForOptimization(fn);
  for (let i = 0; i < 5; i++) assertThrows(fn, ErrorType);
  %OptimizeFunctionOnNextCall(fn);
  assertThrows(fn, ErrorType);
  // TODO(7748): This assertion doesn't hold true, as some cases run into
  // deopt loops.
  // assertTrue(%ActiveTierIsTurbofan(fn));
}

function repeated(fn) {
  %PrepareFunctionForOptimization(fn);
  for (let i = 0; i < 5; i++) fn();
  %OptimizeFunctionOnNextCall(fn);
  fn();
  // TODO(7748): This assertion doesn't hold true, as some cases run into
  // deopt loops.
  // assertTrue(%ActiveTierIsTurbofan(fn));
}