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Classify pattern-matching temp as long-lived #18756

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merged 6 commits into from
Apr 19, 2017
Merged

Classify pattern-matching temp as long-lived #18756

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a142267
Classify pattern-matching temp as long-lived
gafter Apr 17, 2017
f83d864
Add test demonstrating correct code for spilling pattern termps.
gafter Apr 17, 2017
1e86626
Merge branch 'master' of https://github.com/dotnet/roslyn into master…
gafter Apr 17, 2017
ab4f844
Update test to reflect change in status of pattern temps.
gafter Apr 17, 2017
38a4af1
Test generated code for pattern switch (before temp change)
gafter Apr 18, 2017
437f0e8
Add test for precise IL for pattern switch.
gafter Apr 19, 2017
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31 changes: 31 additions & 0 deletions src/Compilers/CSharp/Test/Emit/CodeGen/CodeGenAsyncTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -4952,5 +4952,36 @@ namespace System.Runtime.CompilerServices { class AsyncMethodBuilderAttribute :
Diagnostic(ErrorCode.ERR_BadAsyncMethodBuilderTaskProperty, "{ await Task.Delay(5); throw null; }").WithArguments("MyTaskBuilder", "MyTask", "int").WithLocation(7, 29)
);
}

[Fact, WorkItem(18257, "https://github.com/dotnet/roslyn/issues/18257")]
public void PatternTempsAreLongLived()
{
var source = @"using System;

public class Foo {}

public class C {
public static void Main(string[] args)
{
var c = new C();
c.M(new Foo());
c.M(new object());
}
public async void M(object o) {
switch (o)
{
case Foo _:
Console.Write(0);
break;
default:
Console.Write(1);
break;
}
}
}";
var expectedOutput = @"01";
var compilation = CreateCompilation(source, options: TestOptions.ReleaseExe);
base.CompileAndVerify(compilation, expectedOutput: expectedOutput);
}
}
}
31 changes: 17 additions & 14 deletions src/Compilers/CSharp/Test/Emit/PDB/PDBTests.cs
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Expand Up @@ -2705,9 +2705,9 @@ class Student : Person { public double GPA; }
<customDebugInfo>
<forward declaringType=""Program"" methodName=""Main"" parameterNames=""args"" />
<encLocalSlotMap>
<slot kind=""temp"" />
<slot kind=""temp"" />
<slot kind=""temp"" />
<slot kind=""35"" offset=""11"" />
<slot kind=""35"" offset=""46"" />
<slot kind=""35"" offset=""237"" />
<slot kind=""temp"" />
<slot kind=""0"" offset=""59"" />
<slot kind=""0"" offset=""163"" />
Expand Down Expand Up @@ -2798,9 +2798,9 @@ class Student : Person { public double GPA; }
<encLocalSlotMap>
<slot kind=""30"" offset=""0"" />
<slot kind=""30"" offset=""383"" />
<slot kind=""temp"" />
<slot kind=""temp"" />
<slot kind=""temp"" />
<slot kind=""35"" offset=""11"" />
<slot kind=""35"" offset=""46"" />
<slot kind=""35"" offset=""249"" />
<slot kind=""temp"" />
<slot kind=""1"" offset=""11"" />
<slot kind=""21"" offset=""0"" />
Expand Down Expand Up @@ -5836,13 +5836,16 @@ static void M(object o)
<namespace usingCount=""0"" />
</using>
<encLocalSlotMap>
<slot kind=""temp"" />
<slot kind=""temp"" />
<slot kind=""35"" offset=""11"" />
<slot kind=""35"" offset=""46"" />
<slot kind=""temp"" />
<slot kind=""1"" offset=""11"" />
<slot kind=""temp"" />
<slot kind=""temp"" />
<slot kind=""35"" offset=""378"" />
<slot kind=""35"" offset=""413"" />
<slot kind=""1"" offset=""378"" />
<slot kind=""35"" offset=""511"" />
<slot kind=""1"" offset=""511"" />
</encLocalSlotMap>
</customDebugInfo>
Expand All @@ -5860,12 +5863,12 @@ static void M(object o)
<entry offset=""0x7a"" startLine=""18"" startColumn=""17"" endLine=""18"" endColumn=""23"" />
<entry offset=""0x7c"" startLine=""20"" startColumn=""9"" endLine=""20"" endColumn=""19"" />
<entry offset=""0x81"" hidden=""true"" />
<entry offset=""0xb5"" startLine=""23"" startColumn=""17"" endLine=""23"" endColumn=""23"" />
<entry offset=""0xb7"" startLine=""25"" startColumn=""17"" endLine=""25"" endColumn=""23"" />
<entry offset=""0xb9"" startLine=""27"" startColumn=""9"" endLine=""27"" endColumn=""19"" />
<entry offset=""0xbe"" hidden=""true"" />
<entry offset=""0xc8"" startLine=""30"" startColumn=""17"" endLine=""30"" endColumn=""23"" />
<entry offset=""0xca"" startLine=""32"" startColumn=""5"" endLine=""32"" endColumn=""6"" />
<entry offset=""0xba"" startLine=""23"" startColumn=""17"" endLine=""23"" endColumn=""23"" />
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The changes in sequence points suggest there are changes in IL. Seems like no other test covers the difference in IL. It would be good to have one.

<entry offset=""0xbc"" startLine=""25"" startColumn=""17"" endLine=""25"" endColumn=""23"" />
<entry offset=""0xbe"" startLine=""27"" startColumn=""9"" endLine=""27"" endColumn=""19"" />
<entry offset=""0xc3"" hidden=""true"" />
<entry offset=""0xcf"" startLine=""30"" startColumn=""17"" endLine=""30"" endColumn=""23"" />
<entry offset=""0xd1"" startLine=""32"" startColumn=""5"" endLine=""32"" endColumn=""6"" />
</sequencePoints>
</method>
</methods>
Expand Down
14 changes: 8 additions & 6 deletions src/Compilers/Core/Portable/SynthesizedLocalKind.cs
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Expand Up @@ -32,11 +32,6 @@ internal enum SynthesizedLocalKind
/// </summary>
FrameCache = -5,

/// <summary>
/// Temp created for pattern matching by type.
/// </summary>
PatternMatchingTemp = -4,

/// <summary>
/// Temp variable created by the optimizer.
/// </summary>
Expand All @@ -53,7 +48,9 @@ internal enum SynthesizedLocalKind
EmitterTemp = -1,

/// <summary>
/// The variable is not synthesized (C#, VB).
/// The variable is not synthesized (C#, VB). Note that SynthesizedLocalKind values
/// greater than or equal to this are considered long-lived;
/// see <see cref="SynthesizedLocalKindExtensions.IsLongLived"/>.
/// </summary>
UserDefined = 0,

Expand Down Expand Up @@ -206,6 +203,11 @@ internal enum SynthesizedLocalKind
/// </summary>
InstrumentationPayload = 34,

/// <summary>
/// Temp created for pattern matching by type.
/// </summary>
PatternMatchingTemp = 35,
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I'd remove "Temp" from the name. "Temp" suggests it's temporary, not long lived.
It would also be useful to mention in the comment what value is specifically stored in this variable. Is it the type object we are switching on?


/// <summary>
/// All values have to be less than or equal to <see cref="MaxValidValueForLocalVariableSerializedToDebugInformation"/>
/// (<see cref="EditAndContinueMethodDebugInformation"/>)
Expand Down