mcs/class/System.Core/Test/System.Linq.Expressions/ExpressionTest_Call.cs

   1 //
   2 // ExpressionTest_Call.cs
   3 //
   4 // Author:
   5 //   Federico Di Gregorio <fog@initd.org>
   6 //   Jb Evain (jbevain@novell.com)
   7 //
   8 // (C) 2008 Novell, Inc. (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System;
  31 using System.Reflection;
  32 using System.Reflection.Emit;
  33 using System.Collections.Generic;
  34 using System.Linq;
  35 using System.Linq.Expressions;
  36 using NUnit.Framework;
  37
  38 namespace MonoTests.System.Linq.Expressions {
  39
  40         [TestFixture]
  41         public class ExpressionTest_Call {
  42
  43                 [Test]
  44                 [ExpectedException (typeof (ArgumentNullException))]
  45                 public void Arg1Null ()
  46                 {
  47                         Expression.Call ((Type)null, "TestMethod", null, Expression.Constant (1));
  48                 }
  49
  50                 [Test]
  51                 [ExpectedException (typeof (ArgumentNullException))]
  52                 public void Arg2Null ()
  53                 {
  54                         Expression.Call (typeof (MemberClass), null, null, Expression.Constant (1));
  55                 }
  56
  57                 [Test]
  58                 [ExpectedException (typeof (InvalidOperationException))]
  59                 public void Arg4WrongType ()
  60                 {
  61                         Expression.Call (typeof (MemberClass), "StaticMethod", null, Expression.Constant (true));
  62                 }
  63
  64                 [Test]
  65                 [ExpectedException (typeof (InvalidOperationException))]
  66                 public void InstanceMethod ()
  67                 {
  68                         Expression.Call (typeof (MemberClass), "TestMethod", null, Expression.Constant (1));
  69                 }
  70
  71                 [Test]
  72                 public void StaticMethod ()
  73                 {
  74                         Expression.Call (typeof (MemberClass), "StaticMethod", null, Expression.Constant (1));
  75                 }
  76
  77                 [Test]
  78                 public void StaticGenericMethod ()
  79                 {
  80                         Expression.Call (typeof (MemberClass), "StaticGenericMethod", new [] { typeof (int) }, Expression.Constant (1));
  81                 }
  82
  83                 [Test]
  84                 [ExpectedException (typeof (ArgumentNullException))]
  85                 public void ArgMethodNull ()
  86                 {
  87                         Expression.Call (Expression.Constant (new object ()), null);
  88                 }
  89
  90                 [Test]
  91                 [ExpectedException (typeof (ArgumentException))]
  92                 public void ArgInstanceNullForNonStaticMethod ()
  93                 {
  94                         Expression.Call (null, typeof (object).GetMethod ("ToString"));
  95                 }
  96
  97                 [Test]
  98                 [ExpectedException (typeof (ArgumentException))]
  99                 public void InstanceTypeDoesntMatchMethodDeclaringType ()
 100                 {
 101 #if MOBILE
 102                         // ensure that String.Intern won't be removed by the linker
 103                         string s = String.Intern (String.Empty);
 104 #endif
 105                         Expression.Call (Expression.Constant (1), typeof (string).GetMethod ("Intern"));
 106                 }
 107
 108                 [Test]
 109                 [ExpectedException (typeof (ArgumentException))]
 110                 public void MethodArgumentCountDoesnMatchParameterLength ()
 111                 {
 112                         Expression.Call (Expression.Constant (new object ()), typeof (object).GetMethod ("ToString"), Expression.Constant (new object ()));
 113                 }
 114
 115                 public class Foo {
 116                         public void Bar (string s)
 117                         {
 118                         }
 119                 }
 120
 121                 [Test]
 122                 [ExpectedException (typeof (ArgumentNullException))]
 123                 public void MethodHasNullArgument ()
 124                 {
 125                         Expression.Call (Expression.New (typeof (Foo)), typeof (Foo).GetMethod ("Bar"), null as Expression);
 126                 }
 127
 128                 [Test]
 129                 [ExpectedException (typeof (ArgumentException))]
 130                 public void MethodArgumentDoesntMatchParameterType ()
 131                 {
 132                         Expression.Call (Expression.New (typeof (Foo)), typeof (Foo).GetMethod ("Bar"), Expression.Constant (42));
 133                 }
 134
 135                 [Test]
 136                 public void CallToString ()
 137                 {
 138                         var call = Expression.Call (Expression.Constant (new object ()), typeof (object).GetMethod ("ToString"));
 139                         Assert.AreEqual ("value(System.Object).ToString()", call.ToString ());
 140                 }
 141
 142                 [Test]
 143                 public void CallStringIsNullOrEmpty ()
 144                 {
 145                         var call = Expression.Call (null, typeof (string).GetMethod ("IsNullOrEmpty"), Expression.Constant (""));
 146                         Assert.AreEqual ("IsNullOrEmpty(\"\")", call.ToString ());
 147                 }
 148
 149                 [Test]
 150                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
 151                 [ExpectedException (typeof (ArgumentException))]
 152                 public void CallStaticMethodWithInstanceArgument ()
 153                 {
 154                         Expression.Call (
 155                                 Expression.Parameter (GetType (), "t"),
 156                                 GetType ().GetMethod ("Identity"),
 157                                 Expression.Constant (null));
 158                 }
 159
 160                 public static object Identity (object o)
 161                 {
 162                         return o;
 163                 }
 164
 165                 [Test]
 166                 public void CompileSimpleStaticCall ()
 167                 {
 168                         var p = Expression.Parameter (typeof (object), "o");
 169                         var lambda = Expression.Lambda<Func<object, object>> (Expression.Call (GetType ().GetMethod ("Identity"), p), p);
 170
 171                         var i = lambda.Compile ();
 172
 173                         Assert.AreEqual (2, i (2));
 174                         Assert.AreEqual ("Foo", i ("Foo"));
 175                 }
 176
 177                 [Test]
 178                 public void CompileSimpleInstanceCall ()
 179                 {
 180                         var p = Expression.Parameter (typeof (string), "p");
 181                         var lambda = Expression.Lambda<Func<string, string>> (
 182                                 Expression.Call (
 183                                         p, typeof (string).GetMethod ("ToString", Type.EmptyTypes)),
 184                                 p);
 185
 186                         var ts = lambda.Compile ();
 187
 188                         Assert.AreEqual ("foo", ts ("foo"));
 189                         Assert.AreEqual ("bar", ts ("bar"));
 190                 }
 191
 192                 [Test]
 193                 [ExpectedException (typeof (InvalidOperationException))]
 194                 public void CheckTypeArgsIsNotUsedForParameterLookup ()
 195                 {
 196                         Expression.Call (GetType (), "EineMethod", new [] { typeof (string), typeof (int) }, "foo".ToConstant (), 2.ToConstant ());
 197                 }
 198
 199                 public static void EineGenericMethod<X, Y> (string foo, int bar)
 200                 {
 201                 }
 202
 203                 [Test]
 204                 public void CheckTypeArgsIsUsedForGenericArguments ()
 205                 {
 206                         var m = Expression.Call (GetType (), "EineGenericMethod", new [] { typeof (string), typeof (int) }, "foo".ToConstant (), 2.ToConstant ());
 207                         Assert.IsNotNull (m.Method);
 208                         Assert.AreEqual ("Void EineGenericMethod[String,Int32](System.String, Int32)", m.Method.ToString ());
 209                 }
 210
 211                 public struct EineStrukt {
 212
 213                         public string Foo;
 214
 215                         public EineStrukt (string foo)
 216                         {
 217                                 Foo = foo;
 218                         }
 219
 220                         public string GimmeFoo ()
 221                         {
 222                                 return Foo;
 223                         }
 224                 }
 225
 226                 [Test]
 227                 [Category ("NotWorkingInterpreter")]
 228                 public void CallMethodOnStruct ()
 229                 {
 230                         var param = Expression.Parameter (typeof (EineStrukt), "s");
 231                         var foo = Expression.Lambda<Func<EineStrukt, string>> (
 232                                 Expression.Call (param, typeof (EineStrukt).GetMethod ("GimmeFoo")), param).Compile ();
 233
 234                         var s = new EineStrukt ("foo");
 235                         Assert.AreEqual ("foo", foo (s));
 236                 }
 237
 238                 public static int OneStaticMethod ()
 239                 {
 240                         return 42;
 241                 }
 242
 243                 [Test]
 244                 public void CallMethodOnDateTime ()
 245                 {
 246                         var left = Expression.Call (Expression.Constant (DateTime.Now), typeof(DateTime).GetMethod ("AddDays"), Expression.Constant (-5.0));
 247                         var right = Expression.Constant (DateTime.Today.AddDays (1));
 248                         var expr = Expression.GreaterThan (left, right);
 249
 250                         var eq = Expression.Lambda<Func<bool>> (expr).Compile ();
 251                         Assert.IsFalse (eq ());
 252                 }
 253
 254                 [Test]
 255                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
 256                 [ExpectedException (typeof (ArgumentException))]
 257                 public void CallStaticMethodOnNonSenseInstanceExpression ()
 258                 {
 259                         Expression.Call (
 260                                 Expression.Constant ("la la la"),
 261                                 this.GetType ().GetMethod ("OneStaticMethod"));
 262                 }
 263
 264                 public static int DoSomethingWith (ref int a)
 265                 {
 266                         return a + 4;
 267                 }
 268
 269                 public static string DoAnotherThing (ref int a, string s)
 270                 {
 271                         return s + a;
 272                 }
 273
 274                 [Test]
 275                 [Category ("NotWorkingInterpreter")]
 276                 public void CallStaticMethodWithRefParameter ()
 277                 {
 278                         var p = Expression.Parameter (typeof (int), "i");
 279
 280                         var c = Expression.Lambda<Func<int, int>> (
 281                                 Expression.Call (GetType ().GetMethod ("DoSomethingWith"), p), p).Compile ();
 282
 283                         Assert.AreEqual (42, c (38));
 284                 }
 285
 286                 [Test]
 287                 [Category ("NotWorkingInterpreter")]
 288                 public void CallStaticMethodWithRefParameterAndOtherParameter ()
 289                 {
 290                         var i = Expression.Parameter (typeof (int), "i");
 291                         var s = Expression.Parameter (typeof (string), "s");
 292
 293                         var lamda = Expression.Lambda<Func<int, string, string>> (
 294                                 Expression.Call (GetType ().GetMethod ("DoAnotherThing"), i, s), i, s).Compile ();
 295
 296                         Assert.AreEqual ("foo42", lamda (42, "foo"));
 297                 }
 298
 299                 [Test]
 300                 public void CallDynamicMethod_ToString ()
 301                 {
 302                         // Regression test for #49686
 303                         var m = new DynamicMethod ("intIntId", typeof (int), new Type [] { typeof (int) });
 304                         var ilg = m.GetILGenerator ();
 305                         ilg.Emit (OpCodes.Ldarg_0);
 306                         ilg.Emit (OpCodes.Ret);
 307
 308                         var i = Expression.Parameter (typeof (int), "i");
 309                         var e = Expression.Call (m, i);
 310
 311                         Assert.IsNotNull (e.ToString ());
 312                 }
 313
 314                 [Test]
 315                 public void CallDynamicMethod_CompileInvoke ()
 316                 {
 317                         var m = new DynamicMethod ("intIntId", typeof (int), new Type [] { typeof (int) });
 318                         var ilg = m.GetILGenerator ();
 319                         ilg.Emit (OpCodes.Ldarg_0);
 320                         ilg.Emit (OpCodes.Ret);
 321
 322                         var i = Expression.Parameter (typeof (int), "i");
 323                         var e = Expression.Call (m, i);
 324
 325                         var lambda = Expression.Lambda<Func<int, int>> (e, i).Compile ();
 326                         Assert.AreEqual (42, lambda (42));
 327                 }
 328
 329                 public static int Bang (Expression i)
 330                 {
 331                         return (int) (i as ConstantExpression).Value;
 332                 }
 333                 static bool fout_called = false;
 334
 335                 public static int FooOut (out int x)
 336                 {
 337                         fout_called = true;
 338                         return x = 0;
 339                 }
 340
 341                 [Test]
 342                 [Category ("NotWorkingInterpreter")]
 343                 public void Connect282729 ()
 344                 {
 345                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=282729
 346
 347                         var p = Expression.Parameter (typeof (int), "p");
 348                         var lambda = Expression.Lambda<Func<int, int>> (
 349                                 Expression.Call (
 350                                         GetType ().GetMethod ("FooOut"),
 351                                         Expression.ArrayIndex(
 352                                                 Expression.NewArrayBounds (
 353                                                         typeof(int),
 354                                                         1.ToConstant ()),
 355                                                 0.ToConstant ())),
 356                                 p).Compile ();
 357
 358                         Assert.AreEqual (0, lambda (0));
 359                         Assert.IsTrue (fout_called);
 360                 }
 361
 362                 public static int FooOut2 (out int x)
 363                 {
 364                         x = 2;
 365                         return 3;
 366                 }
 367
 368                 [Test]
 369                 [Category ("NotWorking")]
 370                 [Category ("NotWorkingInterpreter")]
 371                 public void Connect290278 ()
 372                 {
 373                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=290278
 374
 375                         var p = Expression.Parameter (typeof (int [,]), "p");
 376                         var lambda = Expression.Lambda<Func<int [,], int>> (
 377                                 Expression.Call (
 378                                         GetType ().GetMethod ("FooOut2"),
 379                                         Expression.ArrayIndex (p, 0.ToConstant (), 0.ToConstant ())),
 380                                 p).Compile ();
 381
 382                         int [,] data = { { 1 } };
 383
 384                         Assert.AreEqual (3, lambda (data));
 385                         Assert.AreEqual (2, data [0, 0]);
 386                 }
 387
 388                 public static void FooRef (ref string s)
 389                 {
 390                 }
 391
 392                 [Test]
 393                 [Category ("NotWorkingInterpreter")]
 394                 public void Connect297597 ()
 395                 {
 396                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=297597
 397
 398                         var strings = new string [1];
 399
 400                         var lambda = Expression.Lambda<Action> (
 401                                 Expression.Call (
 402                                         GetType ().GetMethod ("FooRef"),
 403                                         Expression.ArrayIndex (
 404                                                 Expression.Constant (strings), 0.ToConstant ()))).Compile ();
 405
 406                         lambda ();
 407                 }
 408
 409                 [Test]
 410                 [Category ("NotDotNet")] // https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=319190
 411                 public void Connect319190 ()
 412                 {
 413                         var lambda = Expression.Lambda<Func<bool>> (
 414                                 Expression.TypeIs (
 415                                         Expression.New (typeof (TypedReference)),
 416                                         typeof (object))).Compile ();
 417
 418                         Assert.IsTrue (lambda ());
 419                 }
 420
 421                 public static int Truc ()
 422                 {
 423                         return 42;
 424                 }
 425
 426                 [Test]
 427                 public void Connect282702 ()
 428                 {
 429                         var lambda = Expression.Lambda<Func<Func<int>>> (
 430                                 Expression.Convert (
 431                                         Expression.Call (
 432                                                 typeof (Delegate).GetMethod ("CreateDelegate", new [] { typeof (Type), typeof (object), typeof (MethodInfo) }),
 433                                                 Expression.Constant (typeof (Func<int>), typeof (Type)),
 434                                                 Expression.Constant (null, typeof (object)),
 435                                                 Expression.Constant (GetType ().GetMethod ("Truc"))),
 436                                         typeof (Func<int>))).Compile ();
 437
 438                         Assert.AreEqual (42, lambda ().Invoke ());
 439                 }
 440
 441                 [Test]
 442                 public void CallQueryableWhere ()
 443                 {
 444                         var queryable = new [] { 1, 2, 3 }.AsQueryable ();
 445
 446                         var parameter = Expression.Parameter (typeof (int), "i");
 447                         var lambda = Expression.Lambda<Func<int, bool>> (
 448                                 Expression.LessThan (parameter, Expression.Constant (2)),
 449                                 parameter);
 450
 451                         var selector = Expression.Quote (lambda);
 452
 453                         var call = Expression.Call (
 454                                 typeof (Queryable),
 455                                 "Where",
 456                                 new [] { typeof (int) },
 457                                 queryable.Expression,
 458                                 selector);
 459
 460                         Assert.IsNotNull (call);
 461                         Assert.IsNotNull (call.Method);
 462                 }
 463
 464                 [Test]
 465                 public void CallAsQueryable () // #537768
 466                 {
 467                         var constant = Expression.Constant (
 468                                 new List<string> (),
 469                                 typeof (IEnumerable<string>));
 470
 471                         var call = Expression.Call (
 472                                 typeof (Queryable),
 473                                 "AsQueryable",
 474                                 new [] { typeof (string) },
 475                                 constant);
 476
 477                         Assert.IsNotNull (call);
 478                         Assert.AreEqual (1, call.Arguments.Count);
 479                         Assert.AreEqual (constant, call.Arguments [0]);
 480
 481                         var method = call.Method;
 482
 483                         Assert.AreEqual ("AsQueryable", method.Name);
 484                         Assert.IsTrue (method.IsGenericMethod);
 485                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 486                 }
 487
 488
 489                 [Test]
 490                 public void CallQueryableSelect () // #536637
 491                 {
 492                         var parameter = Expression.Parameter (typeof (string), "s");
 493                         var string_length = Expression.Property (parameter, typeof (string).GetProperty ("Length"));
 494                         var lambda = Expression.Lambda (string_length, parameter);
 495
 496                         var strings = new [] { "1", "22", "333" };
 497
 498                         var call = Expression.Call (
 499                                 typeof (Queryable),
 500                                 "Select",
 501                                 new [] { typeof (string), typeof (int) },
 502                                 Expression.Constant (strings.AsQueryable ()),
 503                                 lambda);
 504
 505                         Assert.IsNotNull (call);
 506
 507                         var method = call.Method;
 508
 509                         Assert.AreEqual ("Select", method.Name);
 510                         Assert.IsTrue (method.IsGenericMethod);
 511                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 512                         Assert.AreEqual (typeof (int), method.GetGenericArguments () [1]);
 513                 }
 514
 515                 [Test]
 516                 [Category ("NotWorkingInterpreter")]
 517                 public void CallNullableGetValueOrDefault () // #568989
 518                 {
 519                         var value = Expression.Parameter (typeof (int?), "value");
 520                         var default_parameter = Expression.Parameter (typeof (int), "default");
 521
 522                         var getter = Expression.Lambda<Func<int?, int, int>> (
 523                                 Expression.Call (
 524                                         value,
 525                                         "GetValueOrDefault",
 526                                         Type.EmptyTypes,
 527                                         default_parameter),
 528                                 value,
 529                                 default_parameter).Compile ();
 530
 531                         Assert.AreEqual (2, getter (null, 2));
 532                         Assert.AreEqual (4, getter (4, 2));
 533                 }
 534
 535                 [Test]
 536                 public void CallToStringOnEnum () // #625367
 537                 {
 538                         var lambda = Expression.Lambda<Func<string>> (
 539                                 Expression.Call (
 540                                         Expression.Constant (TypeCode.Boolean, typeof (TypeCode)),
 541                                         typeof (object).GetMethod ("ToString"))).Compile ();
 542
 543                         Assert.AreEqual ("Boolean", lambda ());
 544                 }
 545
 546                 public static void AcceptsIEnumerable(IEnumerable<object> o)
 547                 {
 548                 }
 549
 550                 [Test]
 551                 public void CallIQueryableMethodWithNewArrayBoundExpression () // #2304
 552                 {
 553                         Expression.Call (
 554                                 GetType ().GetMethod ("AcceptsIEnumerable", BindingFlags.Public | BindingFlags.Static),
 555                                 Expression.NewArrayBounds (typeof (object), Expression.Constant (0)));
 556                 }
 557         }
 558 }