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be893fdf27
This adds the providesSymbol method to DynamicLibrary. It returns whether the library contains a function with the given name. As per dlsym(3), it is valid for dlsym to return nullptr in a success case if the symbol actually has a NULL value. So I've changed the logic to check for dlerror() after we invoke dlsym(), both in the existing lookup and in the new method. Closes https://github.com/dart-lang/sdk/issues/46192 TEST=tests/ffi(_2)/has_symbol_test.dart Change-Id: Ibcb1c051cc0cdd95a104fe86ef2fc76da5bafb5d Cq-Include-Trybots: luci.dart.try:vm-precomp-ffi-qemu-linux-release-arm-try,vm-ffi-android-debug-arm64-try,vm-ffi-android-debug-arm-try,vm-kernel-linux-debug-x64-try,vm-kernel-win-debug-x64-try,vm-kernel-mac-debug-x64-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/201900 Reviewed-by: Daco Harkes <dacoharkes@google.com> Commit-Queue: Daco Harkes <dacoharkes@google.com>
37 lines
1 KiB
Dart
37 lines
1 KiB
Dart
// Copyright (c) 2021, 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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// SharedObjects=ffi_test_functions
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// @dart=2.9
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import 'dart:ffi';
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import 'dart:io';
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import 'package:expect/expect.dart';
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import 'ffi_test_helpers.dart';
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void main() {
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testHasSymbol();
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}
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void testHasSymbol() {
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Expect.isTrue(ffiTestFunctions.providesSymbol('ReturnMaxUint8'));
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Expect.isFalse(ffiTestFunctions.providesSymbol('SymbolNotInLibrary'));
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if (Platform.isMacOS ||
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Platform.isIOS ||
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Platform.isAndroid ||
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Platform.isLinux) {
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DynamicLibrary p = DynamicLibrary.process();
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Expect.isTrue(p.providesSymbol('dlopen'));
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Expect.isFalse(p.providesSymbol('symbol_that_does_not_exist_in_process'));
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}
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DynamicLibrary e = DynamicLibrary.executable();
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Expect.isTrue(e.providesSymbol('Dart_Invoke'));
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Expect.isFalse(e.providesSymbol('symbol_that_does_not_exist_in_executable'));
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}
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