LibTest/ffi/Pointer/IntPtrPointer_A02_t02.dart

// Copyright (c) 2021, 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.

/// @assertion void operator []=(int index, int value)
///
/// The 32 or 64-bit two's complement integer at address + (4 or 8) * index.
///
/// On 32-bit platforms this is a 32-bit integer, and on 64-bit platforms this
/// is a 64-bit integer.
///
/// On 32-bit platforms a Dart integer is truncated to 32 bits (as if by
/// .toSigned(32)) before being stored, and the 32-bit value is sign-extended
/// when it is loaded.
///
/// On 32-bit platforms the address must be 4-byte aligned, and on 64-bit
/// platforms the address must be 8-byte aligned.
///
/// @description Check that on 32-bit platforms a Dart integer is truncated to
/// 32 bits and on 64-bit platforms a Dart integer is not truncated before being
/// stored
/// @author sgrekhov@unipro.ru

import "dart:ffi";
import "package:ffi/ffi.dart";
import '../../../Utils/expect.dart';

void main() {
  if (sizeOf<IntPtr>() == 4) {
    Pointer<Int32> p1 = calloc<Int32>(2);
    try {
      Pointer<IntPtr> p2 =
          new Pointer.fromAddress(p1.address + sizeOf<IntPtr>());
      p1[0] = 5000000000;
      p1[1] = -5000000000;
      Expect.equals(5000000000.toSigned(32), p1[0]);
      Expect.equals(-5000000000.toSigned(32), p1[1]);
      Expect.equals(-5000000000.toSigned(32), p2.value);
    } finally {
      calloc.free(p1);
    }
  } else {
    Pointer<Int64> p1 = calloc<Int64>(2);
    try {
      Pointer<IntPtr> p2 =
          new Pointer.fromAddress(p1.address + sizeOf<IntPtr>());
      p1[0] = 0x7FFFFFFFFFFFFFFF;
      p1[1] = 0xFFFFFFFFFFFFFFFF;
      Expect.equals(0x7FFFFFFFFFFFFFFF, p1[0]);
      Expect.equals(0xFFFFFFFFFFFFFFFF, p1[1]);
      Expect.equals(0xFFFFFFFFFFFFFFFF, p2.value);
    } finally {
      calloc.free(p1);
    }
  }
}