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// Copyright (c) 2020, 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.
//
// Truncation and sign extension of small ints, tested with something else than
// equality.
//
// SharedObjects=ffi_test_functions
import 'dart:ffi';
import "package:expect/expect.dart";
import "dylib_utils.dart";
main() {
variant1Negative();
variant1Positive();
variant2Negative();
variant2Positive();
variant3Negative();
}
/// `return x == 249 ? 1 : 0`.
///
/// This doesn't catch the error.
final regress40537 = ffiTestFunctions
.lookupFunction<IntPtr Function(Uint8), int Function(int)>("Regress40537");
variant1Negative() {
// 0xF9 = -7 in 2s complement.
// 0xF9 = 249 in unsigned.
final result = regress40537(-7);
print(result);
Expect.equals(1, result);
}
variant1Positive() {
// 0xF9 = 249 in unsigned.
final result = regress40537(0xFFFFFFF9);
print(result);
Expect.equals(1, result);
}
/// `return x`.
///
/// This does.
final regress40537Variant2 =
ffiTestFunctions.lookupFunction<IntPtr Function(Uint8), int Function(int)>(
"Regress40537Variant2");
variant2Negative() {
// The 32 bit representation of -7 is 0xFFFFFFF9.
// Only the lowest byte, 0xF9, should be interpreted by calling convention,
// or it should be truncated and zero extended before calling.
final result = regress40537Variant2(-7);
print(result);
Expect.equals(249, result);
}
variant2Positive() {
// Only the lowest byte, 0xF9, should be interpreted by calling convention,
// or it should be truncated and zero extended before calling.
final result = regress40537Variant2(0xFFFFFFF9);
print(result);
Expect.equals(249, result);
}
/// `return x`.
final regress40537Variant3 =
ffiTestFunctions.lookupFunction<Uint8 Function(IntPtr), int Function(int)>(
"Regress40537Variant3");
variant3Negative() {
// This really passes -7 its intptr_t.
final result = regress40537Variant3(-7);
print(result);
Expect.equals(249, result);
}
final ffiTestFunctions = dlopenPlatformSpecific("ffi_test_functions");