nodejs/deps/v8/test/mjsunit/regress/wasm/regress-12945.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.

// Flags: --no-liftoff --allow-natives-syntax

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

let builder = new WasmModuleBuilder();
let i32_field = makeField(kWasmI32, true);
builder.startRecGroup();
let supertype = builder.addStruct([i32_field]);
let sub1 = builder.addStruct([i32_field, i32_field], supertype);
let sub2 = builder.addStruct([i32_field, makeField(kWasmF64, true)], supertype);
builder.endRecGroup();
let sig = makeSig([wasmRefNullType(supertype)], [kWasmI32]);

let callee = builder.addFunction("callee", sig).addBody([
  kExprLocalGet, 0,
  kGCPrefix, kExprRefTest, sub1,
  kExprIf, kWasmVoid,
  kExprLocalGet, 0,
  kGCPrefix, kExprRefCast, sub1,
  kGCPrefix, kExprStructGet, sub1, 0,
  kExprReturn,
  kExprElse,
  kExprLocalGet, 0,
  kGCPrefix, kExprRefCast, sub2,
  // This {ref.as_non_null} initially believes that it operates on a
  // (ref null sub2), and when getting inlined into {crash} realizes
  // that its actual type is {bottom} because this branch is unreachable.
  kExprRefAsNonNull,
  kGCPrefix, kExprStructGet, sub2, 0,
  kExprReturn,
  kExprEnd,
  kExprI32Const, 42,
]);

builder.addFunction("crash", kSig_i_v).addBody([
  kGCPrefix, kExprStructNewDefault, sub1,
  kExprCallFunction, callee.index,
]).exportFunc();

let instance = builder.instantiate();
instance.exports.crash();