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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.
import 'dart:ffi';
import 'dart:io';
import 'package:ffi/ffi.dart';
const arm = 'arm';
const arm64 = 'arm64';
const ia32 = 'ia32';
const x64 = 'x64';
// https://stackoverflow.com/questions/45125516/possible-values-for-uname-m
final _unames = {
'arm': arm,
'arm64': arm64,
'aarch64_be': arm64,
'aarch64': arm64,
'armv8b': arm64,
'armv8l': arm64,
'i386': ia32,
'i686': ia32,
'x86_64': x64,
};
String _checkRunningMode(String architecture) {
// Check if we're running in 32bit mode.
final int pointerSize = sizeOf<IntPtr>();
if (pointerSize == 4 && architecture == x64) return ia32;
if (pointerSize == 4 && architecture == arm64) return arm;
return architecture;
}
String _architecture() {
final String uname = Process.runSync('uname', ['-m']).stdout.trim();
final String? architecture = _unames[uname];
if (architecture == null) {
throw Exception('Unrecognized architecture: "$uname"');
}
// Check if we're running in 32bit mode.
return _checkRunningMode(architecture);
}
String _platformPath(String name, String path) {
if (Platform.isMacOS || Platform.isIOS) {
return '${path}mac/${_architecture()}/lib$name.dylib';
}
if (Platform.isWindows) {
return '${path}win/${_checkRunningMode(x64)}/$name.dll';
}
// Unknown platforms default to Unix implementation.
return '${path}linux/${_architecture()}/lib$name.so';
}
DynamicLibrary dlopenPlatformSpecific(String name, {String path = ''}) {
final String fullPath = _platformPath(name, path);
return DynamicLibrary.open(fullPath);
}
/// On Linux and Android.
const RTLD_LAZY = 0x00001;
/// On Android Arm.
const RTLD_GLOBAL_android_arm32 = 0x00002;
/// On Linux and Android Arm64.
const RTLD_GLOBAL_rest = 0x00100;
final RTLD_GLOBAL = Abi.current() == Abi.androidArm
? RTLD_GLOBAL_android_arm32
: RTLD_GLOBAL_rest;
@Native<Pointer<Void> Function(Pointer<Char>, Int)>()
external Pointer<Void> dlopen(Pointer<Char> file, int mode);
Object dlopenGlobalPlatformSpecific(String name, {String path = ''}) {
if (Platform.isLinux || Platform.isAndroid) {
// TODO(https://dartbug.com/50105): enable dlopen global via package:ffi.
return using((arena) {
final dylibHandle = dlopen(
_platformPath(name, path).toNativeUtf8(allocator: arena).cast(),
RTLD_LAZY | RTLD_GLOBAL);
return dylibHandle;
});
}
return dlopenPlatformSpecific(name, path: path);
}