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CodeGenConditionalOperatorTests.cs
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CodeGenConditionalOperatorTests.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;
namespace Microsoft.CodeAnalysis.CSharp.UnitTests.CodeGen
{
public class CodeGenConditionalOperatorTests : CSharpTestBase
{
[Fact, WorkItem(61483, "https://github.com/dotnet/roslyn/issues/61483")]
public void Branchless_Compare()
{
var source = """
using static System.Console;
WriteLine(C.Compare(1, 2));
WriteLine(C.Compare(3, 3));
WriteLine(C.Compare(5, 4));
class C
{
public static int Compare(int x, int y)
{
int tmp1 = (x > y) ? 1 : 0;
int tmp2 = (x < y) ? 1 : 0;
return tmp1 - tmp2;
}
}
""";
var verifier = CompileAndVerify(source, expectedOutput: """
-1
0
1
""");
verifier.VerifyDiagnostics();
verifier.VerifyMethodBody("C.Compare", """
{
// Code size 12 (0xc)
.maxstack 3
.locals init (int V_0) //tmp2
// sequence point: int tmp1 = (x > y) ? 1 : 0;
IL_0000: ldarg.0
IL_0001: ldarg.1
IL_0002: cgt
// sequence point: int tmp2 = (x < y) ? 1 : 0;
IL_0004: ldarg.0
IL_0005: ldarg.1
IL_0006: clt
IL_0008: stloc.0
// sequence point: return tmp1 - tmp2;
IL_0009: ldloc.0
IL_000a: sub
IL_000b: ret
}
""");
}
[Fact, WorkItem(61483, "https://github.com/dotnet/roslyn/issues/61483")]
public void Branchless_Operations()
{
var source = """
using static System.Console;
class C
{
static void M(int x, int y, bool b)
{
Write(x == y ? 1 : 0);
Write(x == y ? 0 : 1);
Write(x < y ? 1 : 0);
Write(x < y ? 0 : 1);
Write(x > y ? 1 : 0);
Write(x > y ? 0 : 1);
Write(b ? 0 : 1);
Write(!b ? 0 : 1);
Write(x <= y ? true : false);
Write(x <= y ? false : true);
}
}
""";
var verifier = CompileAndVerify(source);
verifier.VerifyDiagnostics();
verifier.VerifyMethodBody("C.M", """
{
// Code size 100 (0x64)
.maxstack 2
// sequence point: Write(x == y ? 1 : 0);
IL_0000: ldarg.0
IL_0001: ldarg.1
IL_0002: ceq
IL_0004: call "void System.Console.Write(int)"
// sequence point: Write(x == y ? 0 : 1);
IL_0009: ldarg.0
IL_000a: ldarg.1
IL_000b: ceq
IL_000d: ldc.i4.0
IL_000e: ceq
IL_0010: call "void System.Console.Write(int)"
// sequence point: Write(x < y ? 1 : 0);
IL_0015: ldarg.0
IL_0016: ldarg.1
IL_0017: clt
IL_0019: call "void System.Console.Write(int)"
// sequence point: Write(x < y ? 0 : 1);
IL_001e: ldarg.0
IL_001f: ldarg.1
IL_0020: clt
IL_0022: ldc.i4.0
IL_0023: ceq
IL_0025: call "void System.Console.Write(int)"
// sequence point: Write(x > y ? 1 : 0);
IL_002a: ldarg.0
IL_002b: ldarg.1
IL_002c: cgt
IL_002e: call "void System.Console.Write(int)"
// sequence point: Write(x > y ? 0 : 1);
IL_0033: ldarg.0
IL_0034: ldarg.1
IL_0035: cgt
IL_0037: ldc.i4.0
IL_0038: ceq
IL_003a: call "void System.Console.Write(int)"
// sequence point: Write(b ? 0 : 1);
IL_003f: ldarg.2
IL_0040: ldc.i4.0
IL_0041: ceq
IL_0043: call "void System.Console.Write(int)"
// sequence point: Write(!b ? 0 : 1);
IL_0048: ldarg.2
IL_0049: call "void System.Console.Write(int)"
// sequence point: Write(x <= y ? true : false);
IL_004e: ldarg.0
IL_004f: ldarg.1
IL_0050: cgt
IL_0052: ldc.i4.0
IL_0053: ceq
IL_0055: call "void System.Console.Write(bool)"
// sequence point: Write(x <= y ? false : true);
IL_005a: ldarg.0
IL_005b: ldarg.1
IL_005c: cgt
IL_005e: call "void System.Console.Write(bool)"
// sequence point: }
IL_0063: ret
}
""");
}
[Fact, WorkItem(638289, "http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/638289")]
public void ConditionalDelegateInterfaceUnification1()
{
var src =
@"using System;
using System.Security;
[assembly: SecurityTransparent()]
interface I {}
class A : I {}
class C : I
{
static Func<I> Tester(bool a)
{
return a
? (Func<I>)(() => new A())
: () => new C();
}
static void Main()
{
System.Console.Write(Tester(false)().GetType());
}
}";
var verify = CompileAndVerify(src,
options: TestOptions.DebugExe,
expectedOutput: "C");
verify.VerifyIL("C.Tester", @"
{
// Code size 73 (0x49)
.maxstack 2
.locals init (System.Func<I> V_0)
IL_0000: nop
IL_0001: ldarg.0
IL_0002: brtrue.s IL_0025
IL_0004: ldsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_0009: dup
IL_000a: brtrue.s IL_0023
IL_000c: pop
IL_000d: ldsfld ""C.<>c C.<>c.<>9""
IL_0012: ldftn ""I C.<>c.<Tester>b__0_1()""
IL_0018: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_001d: dup
IL_001e: stsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_0023: br.s IL_0044
IL_0025: ldsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_002a: dup
IL_002b: brtrue.s IL_0044
IL_002d: pop
IL_002e: ldsfld ""C.<>c C.<>c.<>9""
IL_0033: ldftn ""I C.<>c.<Tester>b__0_0()""
IL_0039: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_003e: dup
IL_003f: stsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_0044: stloc.0
IL_0045: br.s IL_0047
IL_0047: ldloc.0
IL_0048: ret
}
");
verify = CompileAndVerify(src,
expectedOutput: "C");
verify.VerifyIL("C.Tester", @"
{
// Code size 67 (0x43)
.maxstack 2
IL_0000: ldarg.0
IL_0001: brtrue.s IL_0023
IL_0003: ldsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_0008: dup
IL_0009: brtrue.s IL_0042
IL_000b: pop
IL_000c: ldsfld ""C.<>c C.<>c.<>9""
IL_0011: ldftn ""I C.<>c.<Tester>b__0_1()""
IL_0017: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_001c: dup
IL_001d: stsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_0022: ret
IL_0023: ldsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_0028: dup
IL_0029: brtrue.s IL_0042
IL_002b: pop
IL_002c: ldsfld ""C.<>c C.<>c.<>9""
IL_0031: ldftn ""I C.<>c.<Tester>b__0_0()""
IL_0037: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_003c: dup
IL_003d: stsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_0042: ret
}
");
}
[Fact, WorkItem(20266, "https://github.com/dotnet/roslyn/issues/20266")]
public void ConditionalAccessInMethodGroupConversion()
{
var source = @"
class C
{
void M(object o)
{
System.Func<int, string> filter = new C(o?.ToString()).Method;
filter(0);
}
string Method(int x)
{
throw null;
}
C(string x)
{
}
}
";
var comp = CreateCompilation(source);
comp.VerifyDiagnostics();
CompileAndVerify(comp);
}
[Fact, WorkItem(638289, "http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/638289")]
public void ConditionalDelegateInterfaceUnification2()
{
var src =
@"using System;
using System.Security;
[assembly: SecurityTransparent()]
interface I {}
class A : I {}
class B : I {}
class C : I
{
static Func<I> Tester(int a)
{
return a > 0
? a == 1
? (Func<I>)(() => new A())
: () => new B()
: (() => new C());
}
static void Main()
{
System.Console.Write(Tester(1)().GetType());
}
}";
var verify = CompileAndVerify(src,
options: TestOptions.DebugExe,
expectedOutput: "A");
verify.VerifyIL("C.Tester", @"
{
// Code size 111 (0x6f)
.maxstack 2
.locals init (System.Func<I> V_0)
IL_0000: nop
IL_0001: ldarg.0
IL_0002: ldc.i4.0
IL_0003: bgt.s IL_0026
IL_0005: ldsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_000a: dup
IL_000b: brtrue.s IL_0024
IL_000d: pop
IL_000e: ldsfld ""C.<>c C.<>c.<>9""
IL_0013: ldftn ""I C.<>c.<Tester>b__0_2()""
IL_0019: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_001e: dup
IL_001f: stsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_0024: br.s IL_006a
IL_0026: ldarg.0
IL_0027: ldc.i4.1
IL_0028: beq.s IL_004b
IL_002a: ldsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_002f: dup
IL_0030: brtrue.s IL_0049
IL_0032: pop
IL_0033: ldsfld ""C.<>c C.<>c.<>9""
IL_0038: ldftn ""I C.<>c.<Tester>b__0_1()""
IL_003e: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0043: dup
IL_0044: stsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_0049: br.s IL_006a
IL_004b: ldsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_0050: dup
IL_0051: brtrue.s IL_006a
IL_0053: pop
IL_0054: ldsfld ""C.<>c C.<>c.<>9""
IL_0059: ldftn ""I C.<>c.<Tester>b__0_0()""
IL_005f: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0064: dup
IL_0065: stsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_006a: stloc.0
IL_006b: br.s IL_006d
IL_006d: ldloc.0
IL_006e: ret
}
");
verify = CompileAndVerify(src,
expectedOutput: "A");
verify.VerifyIL("C.Tester", @"
{
// Code size 104 (0x68)
.maxstack 2
IL_0000: ldarg.0
IL_0001: ldc.i4.0
IL_0002: bgt.s IL_0024
IL_0004: ldsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_0009: dup
IL_000a: brtrue.s IL_0067
IL_000c: pop
IL_000d: ldsfld ""C.<>c C.<>c.<>9""
IL_0012: ldftn ""I C.<>c.<Tester>b__0_2()""
IL_0018: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_001d: dup
IL_001e: stsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_0023: ret
IL_0024: ldarg.0
IL_0025: ldc.i4.1
IL_0026: beq.s IL_0048
IL_0028: ldsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_002d: dup
IL_002e: brtrue.s IL_0067
IL_0030: pop
IL_0031: ldsfld ""C.<>c C.<>c.<>9""
IL_0036: ldftn ""I C.<>c.<Tester>b__0_1()""
IL_003c: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0041: dup
IL_0042: stsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_0047: ret
IL_0048: ldsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_004d: dup
IL_004e: brtrue.s IL_0067
IL_0050: pop
IL_0051: ldsfld ""C.<>c C.<>c.<>9""
IL_0056: ldftn ""I C.<>c.<Tester>b__0_0()""
IL_005c: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0061: dup
IL_0062: stsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_0067: ret
}
");
}
[Fact, WorkItem(638289, "http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/638289")]
public void ConditionalDelegateInterfaceUnification3()
{
var src =
@"using System;
using System.Security;
[assembly: SecurityTransparent()]
interface I {}
class A : I {}
class B : I {}
class C : I
{
static Func<I> Tester(int a)
{
return a > 0
? (() => new A())
: a == -1
? (Func<I>)(() => new B())
: (() => new C());
}
static void Main()
{
System.Console.Write(Tester(-1)().GetType());
}
}";
var verify = CompileAndVerify(src,
options: TestOptions.DebugExe,
expectedOutput: "B");
verify.VerifyIL("C.Tester", @"
{
// Code size 111 (0x6f)
.maxstack 2
.locals init (System.Func<I> V_0)
IL_0000: nop
IL_0001: ldarg.0
IL_0002: ldc.i4.0
IL_0003: bgt.s IL_004b
IL_0005: ldarg.0
IL_0006: ldc.i4.m1
IL_0007: beq.s IL_002a
IL_0009: ldsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_000e: dup
IL_000f: brtrue.s IL_0028
IL_0011: pop
IL_0012: ldsfld ""C.<>c C.<>c.<>9""
IL_0017: ldftn ""I C.<>c.<Tester>b__0_2()""
IL_001d: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0022: dup
IL_0023: stsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_0028: br.s IL_0049
IL_002a: ldsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_002f: dup
IL_0030: brtrue.s IL_0049
IL_0032: pop
IL_0033: ldsfld ""C.<>c C.<>c.<>9""
IL_0038: ldftn ""I C.<>c.<Tester>b__0_1()""
IL_003e: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0043: dup
IL_0044: stsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_0049: br.s IL_006a
IL_004b: ldsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_0050: dup
IL_0051: brtrue.s IL_006a
IL_0053: pop
IL_0054: ldsfld ""C.<>c C.<>c.<>9""
IL_0059: ldftn ""I C.<>c.<Tester>b__0_0()""
IL_005f: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0064: dup
IL_0065: stsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_006a: stloc.0
IL_006b: br.s IL_006d
IL_006d: ldloc.0
IL_006e: ret
}
");
verify = CompileAndVerify(src,
expectedOutput: "B");
verify.VerifyIL("C.Tester", @"
{
// Code size 104 (0x68)
.maxstack 2
IL_0000: ldarg.0
IL_0001: ldc.i4.0
IL_0002: bgt.s IL_0048
IL_0004: ldarg.0
IL_0005: ldc.i4.m1
IL_0006: beq.s IL_0028
IL_0008: ldsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_000d: dup
IL_000e: brtrue.s IL_0067
IL_0010: pop
IL_0011: ldsfld ""C.<>c C.<>c.<>9""
IL_0016: ldftn ""I C.<>c.<Tester>b__0_2()""
IL_001c: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0021: dup
IL_0022: stsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_0027: ret
IL_0028: ldsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_002d: dup
IL_002e: brtrue.s IL_0067
IL_0030: pop
IL_0031: ldsfld ""C.<>c C.<>c.<>9""
IL_0036: ldftn ""I C.<>c.<Tester>b__0_1()""
IL_003c: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0041: dup
IL_0042: stsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_0047: ret
IL_0048: ldsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_004d: dup
IL_004e: brtrue.s IL_0067
IL_0050: pop
IL_0051: ldsfld ""C.<>c C.<>c.<>9""
IL_0056: ldftn ""I C.<>c.<Tester>b__0_0()""
IL_005c: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0061: dup
IL_0062: stsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_0067: ret
}");
}
[Fact, WorkItem(638289, "http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/638289")]
public void ConditionalDelegateInterfaceUnification4()
{
var src =
@"using System;
using System.Security;
[assembly: SecurityTransparent()]
interface I {}
class A : I {}
class B : I {}
class D : I {}
class C : I
{
static Func<I> Tester(int a)
{
return a > 0
? a == 1
? (Func<I>)(() => new A())
: () => new B()
: a == -1
? () => new C()
: (Func<I>)(() => new D());
}
static void Main()
{
System.Console.Write(Tester(-2)().GetType());
}
}";
var verify = CompileAndVerify(src,
options: TestOptions.DebugExe,
expectedOutput: "D");
verify.VerifyIL("C.Tester", @"
{
// Code size 148 (0x94)
.maxstack 2
.locals init (System.Func<I> V_0)
IL_0000: nop
IL_0001: ldarg.0
IL_0002: ldc.i4.0
IL_0003: bgt.s IL_004b
IL_0005: ldarg.0
IL_0006: ldc.i4.m1
IL_0007: beq.s IL_002a
IL_0009: ldsfld ""System.Func<I> C.<>c.<>9__0_3""
IL_000e: dup
IL_000f: brtrue.s IL_0028
IL_0011: pop
IL_0012: ldsfld ""C.<>c C.<>c.<>9""
IL_0017: ldftn ""I C.<>c.<Tester>b__0_3()""
IL_001d: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0022: dup
IL_0023: stsfld ""System.Func<I> C.<>c.<>9__0_3""
IL_0028: br.s IL_0049
IL_002a: ldsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_002f: dup
IL_0030: brtrue.s IL_0049
IL_0032: pop
IL_0033: ldsfld ""C.<>c C.<>c.<>9""
IL_0038: ldftn ""I C.<>c.<Tester>b__0_2()""
IL_003e: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0043: dup
IL_0044: stsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_0049: br.s IL_008f
IL_004b: ldarg.0
IL_004c: ldc.i4.1
IL_004d: beq.s IL_0070
IL_004f: ldsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_0054: dup
IL_0055: brtrue.s IL_006e
IL_0057: pop
IL_0058: ldsfld ""C.<>c C.<>c.<>9""
IL_005d: ldftn ""I C.<>c.<Tester>b__0_1()""
IL_0063: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0068: dup
IL_0069: stsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_006e: br.s IL_008f
IL_0070: ldsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_0075: dup
IL_0076: brtrue.s IL_008f
IL_0078: pop
IL_0079: ldsfld ""C.<>c C.<>c.<>9""
IL_007e: ldftn ""I C.<>c.<Tester>b__0_0()""
IL_0084: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0089: dup
IL_008a: stsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_008f: stloc.0
IL_0090: br.s IL_0092
IL_0092: ldloc.0
IL_0093: ret
}
");
verify = CompileAndVerify(src,
expectedOutput: "D");
verify.VerifyIL("C.Tester", @"
{
// Code size 140 (0x8c)
.maxstack 2
IL_0000: ldarg.0
IL_0001: ldc.i4.0
IL_0002: bgt.s IL_0048
IL_0004: ldarg.0
IL_0005: ldc.i4.m1
IL_0006: beq.s IL_0028
IL_0008: ldsfld ""System.Func<I> C.<>c.<>9__0_3""
IL_000d: dup
IL_000e: brtrue.s IL_008b
IL_0010: pop
IL_0011: ldsfld ""C.<>c C.<>c.<>9""
IL_0016: ldftn ""I C.<>c.<Tester>b__0_3()""
IL_001c: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0021: dup
IL_0022: stsfld ""System.Func<I> C.<>c.<>9__0_3""
IL_0027: ret
IL_0028: ldsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_002d: dup
IL_002e: brtrue.s IL_008b
IL_0030: pop
IL_0031: ldsfld ""C.<>c C.<>c.<>9""
IL_0036: ldftn ""I C.<>c.<Tester>b__0_2()""
IL_003c: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0041: dup
IL_0042: stsfld ""System.Func<I> C.<>c.<>9__0_2""
IL_0047: ret
IL_0048: ldarg.0
IL_0049: ldc.i4.1
IL_004a: beq.s IL_006c
IL_004c: ldsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_0051: dup
IL_0052: brtrue.s IL_008b
IL_0054: pop
IL_0055: ldsfld ""C.<>c C.<>c.<>9""
IL_005a: ldftn ""I C.<>c.<Tester>b__0_1()""
IL_0060: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0065: dup
IL_0066: stsfld ""System.Func<I> C.<>c.<>9__0_1""
IL_006b: ret
IL_006c: ldsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_0071: dup
IL_0072: brtrue.s IL_008b
IL_0074: pop
IL_0075: ldsfld ""C.<>c C.<>c.<>9""
IL_007a: ldftn ""I C.<>c.<Tester>b__0_0()""
IL_0080: newobj ""System.Func<I>..ctor(object, System.IntPtr)""
IL_0085: dup
IL_0086: stsfld ""System.Func<I> C.<>c.<>9__0_0""
IL_008b: ret
}
");
}
[Fact(), WorkItem(638289, "http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/638289")]
public void NestedConditional1()
{
var src =
@"using System.Security;
[assembly: SecurityTransparent()]
public interface I {}
class A : I {}
class B : I {}
public class C : I
{
static I Tester(int x, int y)
{
return x == 0
? (y == 0 ? (I)new A() : new B())
: new C();
}
static void Main()
{
System.Console.Write(Tester(1, 0).GetType());
}
}";
var verify = CompileAndVerify(src,
options: TestOptions.DebugExe,
expectedOutput: "C");
verify.VerifyIL("C.Tester", @"
{
// Code size 37 (0x25)
.maxstack 1
.locals init (I V_0,
I V_1)
IL_0000: nop
IL_0001: ldarg.0
IL_0002: brfalse.s IL_000d
IL_0004: newobj ""C..ctor()""
IL_0009: stloc.0
IL_000a: ldloc.0
IL_000b: br.s IL_0020
IL_000d: ldarg.1
IL_000e: brfalse.s IL_0019
IL_0010: newobj ""B..ctor()""
IL_0015: stloc.0
IL_0016: ldloc.0
IL_0017: br.s IL_0020
IL_0019: newobj ""A..ctor()""
IL_001e: stloc.0
IL_001f: ldloc.0
IL_0020: stloc.1
IL_0021: br.s IL_0023
IL_0023: ldloc.1
IL_0024: ret
}");
// Optimized
verify = CompileAndVerify(src,
expectedOutput: "C");
verify.VerifyIL("C.Tester", @"
{
// Code size 30 (0x1e)
.maxstack 1
.locals init (I V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000b
IL_0003: newobj ""C..ctor()""
IL_0008: stloc.0
IL_0009: ldloc.0
IL_000a: ret
IL_000b: ldarg.1
IL_000c: brfalse.s IL_0016
IL_000e: newobj ""B..ctor()""
IL_0013: stloc.0
IL_0014: ldloc.0
IL_0015: ret
IL_0016: newobj ""A..ctor()""
IL_001b: stloc.0
IL_001c: ldloc.0
IL_001d: ret
}");
}
[Fact(), WorkItem(638289, "http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/638289")]
public void NestedConditional2()
{
var src =
@"using System.Security;
[assembly: SecurityTransparent()]
public interface I {}
class A : I {}
class B : I {}
public class C : I
{
static I Tester(int x)
{
return x > 0
? new C()
: (x < 0 ? (I)new A() : new B());
}
static void Main()
{
System.Console.Write(Tester(0).GetType());
}
}";
var verify = CompileAndVerify(src,
options: TestOptions.DebugExe,
expectedOutput: "B");
verify.VerifyIL("C.Tester", @"
{
// Code size 39 (0x27)
.maxstack 2
.locals init (I V_0,
I V_1)
IL_0000: nop
IL_0001: ldarg.0
IL_0002: ldc.i4.0
IL_0003: bgt.s IL_001b
IL_0005: ldarg.0
IL_0006: ldc.i4.0
IL_0007: blt.s IL_0012
IL_0009: newobj ""B..ctor()""
IL_000e: stloc.0
IL_000f: ldloc.0
IL_0010: br.s IL_0019
IL_0012: newobj ""A..ctor()""
IL_0017: stloc.0
IL_0018: ldloc.0
IL_0019: br.s IL_0022
IL_001b: newobj ""C..ctor()""
IL_0020: stloc.0
IL_0021: ldloc.0
IL_0022: stloc.1
IL_0023: br.s IL_0025
IL_0025: ldloc.1
IL_0026: ret
}");
// Optimized
verify = CompileAndVerify(src,
expectedOutput: "B");
verify.VerifyIL("C.Tester", @"
{
// Code size 32 (0x20)
.maxstack 2
.locals init (I V_0)
IL_0000: ldarg.0
IL_0001: ldc.i4.0
IL_0002: bgt.s IL_0018
IL_0004: ldarg.0
IL_0005: ldc.i4.0
IL_0006: blt.s IL_0010
IL_0008: newobj ""B..ctor()""
IL_000d: stloc.0
IL_000e: ldloc.0
IL_000f: ret
IL_0010: newobj ""A..ctor()""
IL_0015: stloc.0
IL_0016: ldloc.0
IL_0017: ret
IL_0018: newobj ""C..ctor()""
IL_001d: stloc.0
IL_001e: ldloc.0
IL_001f: ret
}");
}
[Fact(), WorkItem(638289, "http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/638289")]
public void NestedConditional3()
{
var src =
@"using System.Security;
[assembly: SecurityTransparent()]
public interface I {}
class A : I {}
class B : I {}
class D : I {}
public class C : I
{
static I Tester(int x)
{
return x > 0
? x == 1 ? (I)new A() : new B()
: x == 0 ? (I)new C() : new D();
}
static void Main()
{
System.Console.Write(Tester(1).GetType());
}
}";
var verify = CompileAndVerify(src,
options: TestOptions.DebugExe,
expectedOutput: "A");
verify.VerifyIL("C.Tester", @"
{
// Code size 51 (0x33)
.maxstack 2
.locals init (I V_0,
I V_1)
IL_0000: nop
IL_0001: ldarg.0
IL_0002: ldc.i4.0
IL_0003: bgt.s IL_001a
IL_0005: ldarg.0
IL_0006: brfalse.s IL_0011
IL_0008: newobj ""D..ctor()""
IL_000d: stloc.0
IL_000e: ldloc.0
IL_000f: br.s IL_0018
IL_0011: newobj ""C..ctor()""
IL_0016: stloc.0
IL_0017: ldloc.0
IL_0018: br.s IL_002e
IL_001a: ldarg.0
IL_001b: ldc.i4.1
IL_001c: beq.s IL_0027
IL_001e: newobj ""B..ctor()""
IL_0023: stloc.0
IL_0024: ldloc.0
IL_0025: br.s IL_002e
IL_0027: newobj ""A..ctor()""
IL_002c: stloc.0
IL_002d: ldloc.0
IL_002e: stloc.1
IL_002f: br.s IL_0031
IL_0031: ldloc.1
IL_0032: ret
}");
// Optimized
verify = CompileAndVerify(src,
expectedOutput: "A");
verify.VerifyIL("C.Tester", @"
{
// Code size 43 (0x2b)
.maxstack 2
.locals init (I V_0)
IL_0000: ldarg.0
IL_0001: ldc.i4.0
IL_0002: bgt.s IL_0017
IL_0004: ldarg.0
IL_0005: brfalse.s IL_000f
IL_0007: newobj ""D..ctor()""
IL_000c: stloc.0
IL_000d: ldloc.0
IL_000e: ret
IL_000f: newobj ""C..ctor()""
IL_0014: stloc.0
IL_0015: ldloc.0
IL_0016: ret
IL_0017: ldarg.0
IL_0018: ldc.i4.1
IL_0019: beq.s IL_0023
IL_001b: newobj ""B..ctor()""
IL_0020: stloc.0
IL_0021: ldloc.0
IL_0022: ret
IL_0023: newobj ""A..ctor()""
IL_0028: stloc.0
IL_0029: ldloc.0
IL_002a: ret
}");
}
[Fact(), WorkItem(638289, "http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/638289")]
public void NestedConditional4()
{
var src =
@"using System.Security;
[assembly: SecurityTransparent()]
public interface I {}
class A : I {}
class B : I {}
class D : I {}
public class C : I
{
static I Tester(int x)
{
return x > 0
? x > 1
? x > 2
? (I)new A()
: new B()
: new C()
: new D();
}
static void Main()
{
System.Console.Write(Tester(0).GetType());
}
}";
var verify = CompileAndVerify(src,
options: TestOptions.DebugExe,
expectedOutput: "D");
verify.VerifyIL("C.Tester", @"
{
// Code size 52 (0x34)
.maxstack 2
.locals init (I V_0,
I V_1)
IL_0000: nop
IL_0001: ldarg.0
IL_0002: ldc.i4.0
IL_0003: bgt.s IL_000e