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![Leaf Petersen](/assets/img/avatar_default.png)
Change-Id: Ib33169c3e0ffc870915c189404074a1dea472546 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196548 Reviewed-by: Bob Nystrom <rnystrom@google.com> Commit-Queue: Leaf Petersen <leafp@google.com>
84 lines
2.2 KiB
Dart
84 lines
2.2 KiB
Dart
// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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//
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// Truncation and sign extension of small ints, tested with something else than
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// equality.
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//
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// SharedObjects=ffi_test_functions
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// @dart = 2.9
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import 'dart:ffi';
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import "package:expect/expect.dart";
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import "dylib_utils.dart";
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main() {
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variant1Negative();
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variant1Positive();
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variant2Negative();
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variant2Positive();
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variant3Negative();
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}
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/// `return x == 249 ? 1 : 0`.
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///
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/// This doesn't catch the error.
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final regress40537 = ffiTestFunctions
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.lookupFunction<IntPtr Function(Uint8), int Function(int)>("Regress40537");
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variant1Negative() {
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// 0xF9 = -7 in 2s complement.
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// 0xF9 = 249 in unsinged.
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final result = regress40537(-7);
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print(result);
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Expect.equals(1, result);
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}
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variant1Positive() {
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// 0xF9 = 249 in unsinged.
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final result = regress40537(0xFFFFFFF9);
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print(result);
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Expect.equals(1, result);
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}
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/// `return x`.
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///
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/// This does.
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final regress40537Variant2 =
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ffiTestFunctions.lookupFunction<IntPtr Function(Uint8), int Function(int)>(
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"Regress40537Variant2");
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variant2Negative() {
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// The 32 bit representation of -7 is 0xFFFFFFF9.
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// Only the lowest byte, 0xF9, should be interpreted by calling convention,
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// or it should be truncated and zero extended before calling.
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final result = regress40537Variant2(-7);
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print(result);
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Expect.equals(249, result);
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}
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variant2Positive() {
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// Only the lowest byte, 0xF9, should be interpreted by calling convention,
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// or it should be truncated and zero extended before calling.
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final result = regress40537Variant2(0xFFFFFFF9);
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print(result);
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Expect.equals(249, result);
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}
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/// `return x`.
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final regress40537Variant3 =
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ffiTestFunctions.lookupFunction<Uint8 Function(IntPtr), int Function(int)>(
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"Regress40537Variant3");
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variant3Negative() {
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// This really passes -7 its intptr_t.
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final result = regress40537Variant3(-7);
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print(result);
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Expect.equals(249, result);
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}
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final ffiTestFunctions = dlopenPlatformSpecific("ffi_test_functions");
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