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                 public void CallMethodOnStruct ()
 228                 {
 229                         var param = Expression.Parameter (typeof (EineStrukt), "s");
 230                         var foo = Expression.Lambda<Func<EineStrukt, string>> (
 231                                 Expression.Call (param, typeof (EineStrukt).GetMethod ("GimmeFoo")), param).Compile ();
 232
 233                         var s = new EineStrukt ("foo");
 234                         Assert.AreEqual ("foo", foo (s));
 235                 }
 236
 237                 public static int OneStaticMethod ()
 238                 {
 239                         return 42;
 240                 }
 241
 242                 [Test]
 243                 public void CallMethodOnDateTime ()
 244                 {
 245                         var left = Expression.Call (Expression.Constant (DateTime.Now), typeof(DateTime).GetMethod ("AddDays"), Expression.Constant (-5.0));
 246                         var right = Expression.Constant (DateTime.Today.AddDays (1));
 247                         var expr = Expression.GreaterThan (left, right);
 248
 249                         var eq = Expression.Lambda<Func<bool>> (expr).Compile ();
 250                         Assert.IsFalse (eq ());
 251                 }
 252
 253                 [Test]
 254                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
 255                 [ExpectedException (typeof (ArgumentException))]
 256                 public void CallStaticMethodOnNonSenseInstanceExpression ()
 257                 {
 258                         Expression.Call (
 259                                 Expression.Constant ("la la la"),
 260                                 this.GetType ().GetMethod ("OneStaticMethod"));
 261                 }
 262
 263                 public static int DoSomethingWith (ref int a)
 264                 {
 265                         return a + 4;
 266                 }
 267
 268                 public static string DoAnotherThing (ref int a, string s)
 269                 {
 270                         return s + a;
 271                 }
 272
 273                 [Test]
 274                 public void CallStaticMethodWithRefParameter ()
 275                 {
 276                         var p = Expression.Parameter (typeof (int), "i");
 277
 278                         var c = Expression.Lambda<Func<int, int>> (
 279                                 Expression.Call (GetType ().GetMethod ("DoSomethingWith"), p), p).Compile ();
 280
 281                         Assert.AreEqual (42, c (38));
 282                 }
 283
 284                 [Test]
 285                 public void CallStaticMethodWithRefParameterAndOtherParameter ()
 286                 {
 287                         var i = Expression.Parameter (typeof (int), "i");
 288                         var s = Expression.Parameter (typeof (string), "s");
 289
 290                         var lamda = Expression.Lambda<Func<int, string, string>> (
 291                                 Expression.Call (GetType ().GetMethod ("DoAnotherThing"), i, s), i, s).Compile ();
 292
 293                         Assert.AreEqual ("foo42", lamda (42, "foo"));
 294                 }
 295
 296 #if !FULL_AOT_RUNTIME
 297                 [Test]
 298                 public void CallDynamicMethod_ToString ()
 299                 {
 300                         // Regression test for #49686
 301                         var m = new DynamicMethod ("intIntId", typeof (int), new Type [] { typeof (int) });
 302                         var ilg = m.GetILGenerator ();
 303                         ilg.Emit (OpCodes.Ldarg_0);
 304                         ilg.Emit (OpCodes.Ret);
 305
 306                         var i = Expression.Parameter (typeof (int), "i");
 307                         var e = Expression.Call (m, i);
 308
 309                         Assert.IsNotNull (e.ToString ());
 310                 }
 311
 312                 [Test]
 313                 public void CallDynamicMethod_CompileInvoke ()
 314                 {
 315                         var m = new DynamicMethod ("intIntId", typeof (int), new Type [] { typeof (int) });
 316                         var ilg = m.GetILGenerator ();
 317                         ilg.Emit (OpCodes.Ldarg_0);
 318                         ilg.Emit (OpCodes.Ret);
 319
 320                         var i = Expression.Parameter (typeof (int), "i");
 321                         var e = Expression.Call (m, i);
 322
 323                         var lambda = Expression.Lambda<Func<int, int>> (e, i).Compile ();
 324                         Assert.AreEqual (42, lambda (42));
 325                 }
 326 #endif
 327
 328                 public static int Bang (Expression i)
 329                 {
 330                         return (int) (i as ConstantExpression).Value;
 331                 }
 332                 static bool fout_called = false;
 333
 334                 public static int FooOut (out int x)
 335                 {
 336                         fout_called = true;
 337                         return x = 0;
 338                 }
 339
 340                 [Test]
 341                 public void Connect282729 ()
 342                 {
 343                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=282729
 344
 345                         var p = Expression.Parameter (typeof (int), "p");
 346                         var lambda = Expression.Lambda<Func<int, int>> (
 347                                 Expression.Call (
 348                                         GetType ().GetMethod ("FooOut"),
 349                                         Expression.ArrayIndex(
 350                                                 Expression.NewArrayBounds (
 351                                                         typeof(int),
 352                                                         1.ToConstant ()),
 353                                                 0.ToConstant ())),
 354                                 p).Compile ();
 355
 356                         Assert.AreEqual (0, lambda (0));
 357                         Assert.IsTrue (fout_called);
 358                 }
 359
 360                 public static int FooOut2 (out int x)
 361                 {
 362                         x = 2;
 363                         return 3;
 364                 }
 365
 366                 [Test]
 367                 public void Connect290278 ()
 368                 {
 369                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=290278
 370
 371                         var p = Expression.Parameter (typeof (int [,]), "p");
 372                         var lambda = Expression.Lambda<Func<int [,], int>> (
 373                                 Expression.Call (
 374                                         GetType ().GetMethod ("FooOut2"),
 375                                         Expression.ArrayIndex (p, 0.ToConstant (), 0.ToConstant ())),
 376                                 p).Compile ();
 377
 378                         int [,] data = { { 1 } };
 379
 380                         Assert.AreEqual (3, lambda (data));
 381                         Assert.AreEqual (2, data [0, 0]);
 382                 }
 383
 384                 public static void FooRef (ref string s)
 385                 {
 386                 }
 387
 388                 [Test]
 389                 public void Connect297597 ()
 390                 {
 391                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=297597
 392
 393                         var strings = new string [1];
 394
 395                         var lambda = Expression.Lambda<Action> (
 396                                 Expression.Call (
 397                                         GetType ().GetMethod ("FooRef"),
 398                                         Expression.ArrayIndex (
 399                                                 Expression.Constant (strings), 0.ToConstant ()))).Compile ();
 400
 401                         lambda ();
 402                 }
 403
 404                 [Test]
 405                 [Category ("NotDotNet")] // https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=319190
 406                 [Category ("NotWorkingInterpreter")]
 407                 public void Connect319190 ()
 408                 {
 409                         var lambda = Expression.Lambda<Func<bool>> (
 410                                 Expression.TypeIs (
 411                                         Expression.New (typeof (TypedReference)),
 412                                         typeof (object))).Compile ();
 413
 414                         Assert.IsTrue (lambda ());
 415                 }
 416
 417                 public static int Truc ()
 418                 {
 419                         return 42;
 420                 }
 421
 422                 [Test]
 423                 public void Connect282702 ()
 424                 {
 425                         var lambda = Expression.Lambda<Func<Func<int>>> (
 426                                 Expression.Convert (
 427                                         Expression.Call (
 428                                                 typeof (Delegate).GetMethod ("CreateDelegate", new [] { typeof (Type), typeof (object), typeof (MethodInfo) }),
 429                                                 Expression.Constant (typeof (Func<int>), typeof (Type)),
 430                                                 Expression.Constant (null, typeof (object)),
 431                                                 Expression.Constant (GetType ().GetMethod ("Truc"))),
 432                                         typeof (Func<int>))).Compile ();
 433
 434                         Assert.AreEqual (42, lambda ().Invoke ());
 435                 }
 436
 437                 [Test]
 438                 public void CallQueryableWhere ()
 439                 {
 440                         var queryable = new [] { 1, 2, 3 }.AsQueryable ();
 441
 442                         var parameter = Expression.Parameter (typeof (int), "i");
 443                         var lambda = Expression.Lambda<Func<int, bool>> (
 444                                 Expression.LessThan (parameter, Expression.Constant (2)),
 445                                 parameter);
 446
 447                         var selector = Expression.Quote (lambda);
 448
 449                         var call = Expression.Call (
 450                                 typeof (Queryable),
 451                                 "Where",
 452                                 new [] { typeof (int) },
 453                                 queryable.Expression,
 454                                 selector);
 455
 456                         Assert.IsNotNull (call);
 457                         Assert.IsNotNull (call.Method);
 458                 }
 459
 460                 [Test]
 461                 public void CallAsQueryable () // #537768
 462                 {
 463                         var constant = Expression.Constant (
 464                                 new List<string> (),
 465                                 typeof (IEnumerable<string>));
 466
 467                         var call = Expression.Call (
 468                                 typeof (Queryable),
 469                                 "AsQueryable",
 470                                 new [] { typeof (string) },
 471                                 constant);
 472
 473                         Assert.IsNotNull (call);
 474                         Assert.AreEqual (1, call.Arguments.Count);
 475                         Assert.AreEqual (constant, call.Arguments [0]);
 476
 477                         var method = call.Method;
 478
 479                         Assert.AreEqual ("AsQueryable", method.Name);
 480                         Assert.IsTrue (method.IsGenericMethod);
 481                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 482                 }
 483
 484
 485                 [Test]
 486                 public void CallQueryableSelect () // #536637
 487                 {
 488                         var parameter = Expression.Parameter (typeof (string), "s");
 489                         var string_length = Expression.Property (parameter, typeof (string).GetProperty ("Length"));
 490                         var lambda = Expression.Lambda (string_length, parameter);
 491
 492                         var strings = new [] { "1", "22", "333" };
 493
 494                         var call = Expression.Call (
 495                                 typeof (Queryable),
 496                                 "Select",
 497                                 new [] { typeof (string), typeof (int) },
 498                                 Expression.Constant (strings.AsQueryable ()),
 499                                 lambda);
 500
 501                         Assert.IsNotNull (call);
 502
 503                         var method = call.Method;
 504
 505                         Assert.AreEqual ("Select", method.Name);
 506                         Assert.IsTrue (method.IsGenericMethod);
 507                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 508                         Assert.AreEqual (typeof (int), method.GetGenericArguments () [1]);
 509                 }
 510
 511                 [Test]
 512                 public void CallNullableGetValueOrDefault () // #568989
 513                 {
 514                         var value = Expression.Parameter (typeof (int?), "value");
 515                         var default_parameter = Expression.Parameter (typeof (int), "default");
 516
 517                         var getter = Expression.Lambda<Func<int?, int, int>> (
 518                                 Expression.Call (
 519                                         value,
 520                                         "GetValueOrDefault",
 521                                         Type.EmptyTypes,
 522                                         default_parameter),
 523                                 value,
 524                                 default_parameter).Compile ();
 525
 526                         Assert.AreEqual (2, getter (null, 2));
 527                         Assert.AreEqual (4, getter (4, 2));
 528                 }
 529
 530                 [Test]
 531                 public void CallToStringOnEnum () // #625367
 532                 {
 533                         var lambda = Expression.Lambda<Func<string>> (
 534                                 Expression.Call (
 535                                         Expression.Constant (TypeCode.Boolean, typeof (TypeCode)),
 536                                         typeof (object).GetMethod ("ToString"))).Compile ();
 537
 538                         Assert.AreEqual ("Boolean", lambda ());
 539                 }
 540
 541                 public static void AcceptsIEnumerable(IEnumerable<object> o)
 542                 {
 543                 }
 544
 545                 [Test]
 546                 public void CallIQueryableMethodWithNewArrayBoundExpression () // #2304
 547                 {
 548                         Expression.Call (
 549                                 GetType ().GetMethod ("AcceptsIEnumerable", BindingFlags.Public | BindingFlags.Static),
 550                                 Expression.NewArrayBounds (typeof (object), Expression.Constant (0)));
 551                 }
 552         }
 553 }