tests/web/wasm/memory_test.dart

// Copyright (c) 2026, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// dart2wasmOptions=--extra-compiler-option=--enable-experimental-wasm-interop

import 'dart:_wasm';

import 'package:expect/expect.dart';

@pragma('wasm:memory-type', MemoryType(limits: Limits(1, 10)))
external Memory get _memory;

void main() {
  _testSizeAndGrow();
  _testFill();

  _testFloat();
  _testInt();
  _testOffset();
}

void _testSizeAndGrow() {
  Expect.equals(1, _memory.size);
  Expect.equals(1, _memory.grow(1));
  Expect.equals(2, _memory.size);

  Expect.equals(0, _memory.loadInt32(Memory.pageSize + 1).toIntSigned());

  Expect.equals(-1, _memory.grow(20));
}

void _testFill() {
  _memory.fill(WasmI32.fromInt(42), 0, 1024);
  for (var i = 0; i < 1024; i++) {
    Expect.equals(42, _memory.loadUint8(i).toIntSigned());
  }
}

void _testFloat() {
  _memory.storeFloat64(0, WasmF64.fromDouble(1.5));
  Expect.equals(1.5, _memory.loadFloat64(0).toDouble());

  _memory.storeFloat32(0, WasmF32.fromDouble(1.5));
  Expect.equals(1.5, _memory.loadFloat32(0).toDouble());
}

void _testInt() {
  _memory.storeInt8(0, WasmI32.fromInt(-1));
  Expect.equals(-1, _memory.loadInt8(0).toIntSigned());
  Expect.equals(255, _memory.loadUint8(0).toIntUnsigned());
}

void _testOffset() {
  _memory.storeInt32(0, WasmI32.fromInt(0x01020304));
  Expect.equals(0x01, _memory.loadInt8(0, offset: 3).toIntSigned());
  Expect.equals(0x02, _memory.loadInt8(0, offset: 2).toIntSigned());
  Expect.equals(0x03, _memory.loadInt8(0, offset: 1).toIntSigned());
  Expect.equals(0x04, _memory.loadInt8(0, offset: 0).toIntSigned());
}