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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 programing for testing that optimizations do wrongly assume loads
// from and stores to C memory are not aliased.
//
// SharedObjects=ffi_test_functions
// VMOptions=--deterministic --optimization-counter-threshold=50
library FfiTest;
import 'dart:ffi';
import "package:expect/expect.dart";
import 'dylib_utils.dart';
void main() {
for (int i = 0; i < 100; ++i) {
testNonAlias();
testAliasCast();
testAliasCast2();
testAliasOffsetBy();
testAliasOffsetBy2();
testAliasElementAt();
testAliasElementAt2();
testAliasFromAddress();
testAliasFromAddress2();
testAliasFromAddressViaMemory();
testAliasFromAddressViaMemory2();
testAliasFromAddressViaNativeFunction();
testAliasFromAddressViaNativeFunction2();
testPartialOverlap();
}
}
void testNonAlias() {
final source = Pointer<Int64>.allocate();
source.store(42);
final int a = source.load();
source.store(1984);
// alias.load() should be re-executed, as we wrote to alias.
Expect.notEquals(a, source.load<int>());
source.free();
}
void testAliasCast() {
final source = Pointer<Int64>.allocate();
final alias = source.cast<Int8>().cast<Int64>();
source.store(42);
final int a = source.load();
alias.store(1984);
// source.load() should be re-executed, we wrote alias which aliases source.
Expect.notEquals(a, source.load<int>());
source.free();
}
void testAliasCast2() {
final source = Pointer<Int64>.allocate();
final alias = source.cast<Int16>().cast<Int64>();
final alias2 = source.cast<Int8>().cast<Int64>();
alias.store(42);
final int a = alias.load();
alias2.store(1984);
// alias.load() should be re-executed, we wrote alias2 which aliases alias.
Expect.notEquals(a, alias.load<int>());
source.free();
}
void testAliasOffsetBy() {
final source = Pointer<Int64>.allocate(count: 2);
final alias = source.offsetBy(8).offsetBy(-8);
source.store(42);
final int a = source.load();
alias.store(1984);
// source.load() should be re-executed, we wrote alias which aliases source.
Expect.notEquals(a, source.load<int>());
source.free();
}
void testAliasOffsetBy2() {
final source = Pointer<Int64>.allocate(count: 3);
final alias = source.offsetBy(16).offsetBy(-16);
final alias2 = source.offsetBy(8).offsetBy(-8);
alias.store(42);
final int a = alias.load();
alias2.store(1984);
// alias.load() should be re-executed, we wrote alias2 which aliases alias.
Expect.notEquals(a, alias.load<int>());
source.free();
}
void testAliasElementAt() {
final source = Pointer<Int64>.allocate(count: 2);
final alias = source.elementAt(1).elementAt(-1);
source.store(42);
final int a = source.load();
alias.store(1984);
// source.load() should be re-executed, we wrote alias which aliases source.
Expect.notEquals(a, source.load<int>());
source.free();
}
void testAliasElementAt2() {
final source = Pointer<Int64>.allocate(count: 3);
final alias = source.elementAt(2).elementAt(-2);
final alias2 = source.elementAt(1).elementAt(-1);
alias.store(42);
final int a = alias.load();
alias2.store(1984);
// alias.load() should be re-executed, we wrote alias2 which aliases alias.
Expect.notEquals(a, alias.load<int>());
source.free();
}
void testAliasFromAddress() {
final source = Pointer<Int64>.allocate();
final alias = Pointer<Int64>.fromAddress(source.address);
source.store(42);
final int a = source.load();
alias.store(1984);
// source.load() should be re-executed, we wrote alias which aliases source.
Expect.notEquals(a, source.load<int>());
source.free();
}
void testAliasFromAddress2() {
final source = Pointer<Int64>.allocate();
final alias = Pointer<Int64>.fromAddress(source.address);
final alias2 = Pointer<Int64>.fromAddress(source.address);
alias.store(42);
final int a = alias.load();
alias2.store(1984);
// alias.load() should be re-executed, we wrote alias2 which aliases alias.
Expect.notEquals(a, alias.load<int>());
source.free();
}
void testAliasFromAddressViaMemory() {
final helper = Pointer<IntPtr>.allocate();
final source = Pointer<Int64>.allocate();
helper.store(source.address);
final alias = Pointer<Int64>.fromAddress(helper.load());
source.store(42);
final int a = source.load();
alias.store(1984);
// source.load() should be re-executed, we wrote alias which aliases source.
Expect.notEquals(a, source.load<int>());
helper.free();
source.free();
}
void testAliasFromAddressViaMemory2() {
final helper = Pointer<IntPtr>.allocate();
final source = Pointer<Int64>.allocate();
helper.store(source.address);
final alias = Pointer<Int64>.fromAddress(helper.load());
final alias2 = Pointer<Int64>.fromAddress(helper.load());
alias.store(42);
final int a = alias.load();
alias2.store(1984);
// alias.load() should be re-executed, we wrote alias2 which aliases alias.
Expect.notEquals(a, alias.load<int>());
helper.free();
source.free();
}
typedef NativeQuadOpSigned = Int64 Function(Int8, Int16, Int32, Int64);
typedef QuadOp = int Function(int, int, int, int);
DynamicLibrary ffiTestFunctions = dlopenPlatformSpecific("ffi_test_functions");
QuadOp intComputation = ffiTestFunctions
.lookupFunction<NativeQuadOpSigned, QuadOp>("IntComputation");
void testAliasFromAddressViaNativeFunction() {
final source = Pointer<Int64>.allocate();
final alias =
Pointer<Int64>.fromAddress(intComputation(0, 0, 0, source.address));
source.store(42);
final int a = source.load();
alias.store(1984);
// source.load() should be re-executed, we wrote alias which aliases source.
Expect.notEquals(a, source.load<int>());
source.free();
}
void testAliasFromAddressViaNativeFunction2() {
final source = Pointer<Int64>.allocate();
final alias =
Pointer<Int64>.fromAddress(intComputation(0, 0, 0, source.address));
final alias2 =
Pointer<Int64>.fromAddress(intComputation(0, 0, 0, source.address));
alias.store(42);
final int a = alias.load();
alias2.store(1984);
// alias.load() should be re-executed, we wrote alias2 which aliases alias.
Expect.notEquals(a, alias.load<int>());
source.free();
}
@pragma('vm:never-inline')
Pointer<Int8> makeDerived(Pointer<Int64> source) =>
source.offsetBy(7).cast<Int8>();
testPartialOverlap() {
final source = Pointer<Int64>.allocate(count: 2);
final derived = makeDerived(source);
source.store(0x1122334455667788);
final int value = source.load();
derived.store(0xaa);
Expect.notEquals(value, source.load<int>());
source.free();
}