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// Copyright (c) 2019, 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.
//
// Dart test program for testing dart:ffi struct pointers.
//
// VMOptions=--deterministic --optimization-counter-threshold=50
// @dart = 2.9
import 'dart:ffi';
import "package:expect/expect.dart";
import "package:ffi/ffi.dart";
import 'coordinate.dart';
void main() {
for (int i = 0; i < 100; i++) {
testStructAllocate();
testStructFromAddress();
testStructIndexedAccess();
testStructWithNulls();
testTypeTest();
testUtf8();
testDotDotRef();
}
}
/// Allocates each coordinate separately in c memory.
void testStructAllocate() {
final c1 = calloc<Coordinate>()
..ref.x = 10.0
..ref.y = 10.0;
final c2 = calloc<Coordinate>()
..ref.x = 20.0
..ref.y = 20.0
..ref.next = c1;
final c3 = calloc<Coordinate>()
..ref.x = 30.0
..ref.y = 30.0
..ref.next = c2;
c1.ref.next = c3;
Coordinate currentCoordinate = c1.ref;
Expect.equals(10.0, currentCoordinate.x);
currentCoordinate = currentCoordinate.next.ref;
Expect.equals(30.0, currentCoordinate.x);
currentCoordinate = currentCoordinate.next.ref;
Expect.equals(20.0, currentCoordinate.x);
currentCoordinate = currentCoordinate.next.ref;
Expect.equals(10.0, currentCoordinate.x);
calloc.free(c1);
calloc.free(c2);
calloc.free(c3);
}
/// Allocates coordinates consecutively in c memory.
void testStructFromAddress() {
Pointer<Coordinate> c1 = calloc(3);
Pointer<Coordinate> c2 = c1.elementAt(1);
Pointer<Coordinate> c3 = c1.elementAt(2);
c1.ref
..x = 10.0
..y = 10.0
..next = c3;
c2.ref
..x = 20.0
..y = 20.0
..next = c1;
c3.ref
..x = 30.0
..y = 30.0
..next = c2;
Coordinate currentCoordinate = c1.ref;
Expect.equals(10.0, currentCoordinate.x);
currentCoordinate = currentCoordinate.next.ref;
Expect.equals(30.0, currentCoordinate.x);
currentCoordinate = currentCoordinate.next.ref;
Expect.equals(20.0, currentCoordinate.x);
currentCoordinate = currentCoordinate.next.ref;
Expect.equals(10.0, currentCoordinate.x);
calloc.free(c1);
}
/// Allocates coordinates consecutively in c memory.
void testStructIndexedAccess() {
Pointer<Coordinate> cs = calloc(3);
cs[0]
..x = 10.0
..y = 10.0
..next = cs.elementAt(2);
cs[1]
..x = 20.0
..y = 20.0
..next = cs;
cs[2]
..x = 30.0
..y = 30.0
..next = cs.elementAt(1);
Coordinate currentCoordinate = cs.ref;
Expect.equals(10.0, currentCoordinate.x);
currentCoordinate = currentCoordinate.next.ref;
Expect.equals(30.0, currentCoordinate.x);
currentCoordinate = currentCoordinate.next.ref;
Expect.equals(20.0, currentCoordinate.x);
currentCoordinate = currentCoordinate.next.ref;
Expect.equals(10.0, currentCoordinate.x);
calloc.free(cs);
}
void testStructWithNulls() {
final coordinate = calloc<Coordinate>()
..ref.x = 10.0
..ref.y = 10.0;
Expect.equals(coordinate.ref.next, nullptr);
coordinate.ref.next = coordinate;
Expect.notEquals(coordinate.ref.next, nullptr);
coordinate.ref.next = nullptr;
Expect.equals(coordinate.ref.next, nullptr);
calloc.free(coordinate);
}
void testTypeTest() {
final pointer = calloc<Coordinate>();
Coordinate c = pointer.ref;
Expect.isTrue(c is Struct);
calloc.free(pointer);
}
void testUtf8() {
final String test = 'Hasta MaƱana';
final Pointer<Utf8> medium = test.toNativeUtf8();
Expect.equals(test, medium.toDartString());
calloc.free(medium);
}
void testDotDotRef() {
final pointer = calloc<Coordinate>()
..ref.x = 1
..ref.y = 1;
calloc.free(pointer);
}