Long tuples

8c88d8f1 · VSadov · fa10f4ec · 8c88d8f1 · 8c88d8f1 · 8c88d8f1
3 changed file
--- a/src/Compilers/VisualBasic/Portable/Lowering/LocalRewriter/LocalRewriter_FieldAccess.vb
+++ b/src/Compilers/VisualBasic/Portable/Lowering/LocalRewriter/LocalRewriter_FieldAccess.vb
 ' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+Imports System.Collections.Immutable
 Imports System.Diagnostics
 Imports System.Runtime.InteropServices
 Imports Microsoft.CodeAnalysis.Text
@@ -10,8 +11,69 @@ Imports TypeKind = Microsoft.CodeAnalysis.TypeKind
 Namespace Microsoft.CodeAnalysis.VisualBasic
    Partial Friend NotInheritable Class LocalRewriter
        Public Overrides Function VisitFieldAccess(node As BoundFieldAccess) As BoundNode
-            Dim receiverOpt As BoundExpression = If(node.FieldSymbol.IsShared, Nothing, Me.VisitExpressionNode(node.ReceiverOpt))
+            Dim rewrittenReceiver As BoundExpression = If(node.FieldSymbol.IsShared, Nothing, Me.VisitExpressionNode(node.ReceiverOpt))
-            Return node.Update(receiverOpt, node.FieldSymbol, node.IsLValue, node.SuppressVirtualCalls, node.ConstantsInProgressOpt, node.Type)
+            If node.FieldSymbol.IsTupleField Then
+                Return MakeTupleFieldAccess(node.Syntax, node.FieldSymbol, rewrittenReceiver, node.ConstantValueOpt, node.IsLValue)
+            End If
+            Return node.Update(rewrittenReceiver, node.FieldSymbol, node.IsLValue, node.SuppressVirtualCalls, node.ConstantsInProgressOpt, node.Type)
+        End Function
+        ''' <summary>
+        ''' Converts access to a tuple instance into access into the underlying ValueTuple(s).
+        '''
+        ''' For instance, tuple.Item8
+        ''' produces fieldAccess(field=Item1, receiver=fieldAccess(field=Rest, receiver=ValueTuple for tuple))
+        ''' </summary>
+        Private Function MakeTupleFieldAccess(
+            syntax As VisualBasicSyntaxNode,
+            tupleField As FieldSymbol,
+            rewrittenReceiver As BoundExpression,
+            constantValueOpt As ConstantValue,
+            isLValue As Boolean) As BoundExpression
+            Dim tupleType = tupleField.ContainingType
+            Dim currentLinkType As NamedTypeSymbol = tupleType.TupleUnderlyingType
+            Dim underlyingField As FieldSymbol = tupleField.TupleUnderlyingField
+            If underlyingField Is Nothing Then
+                ' Use-site error must have been reported elsewhere.
+                Return MakeBadFieldAccess(syntax, tupleField, rewrittenReceiver)
+            End If
+            If underlyingField.ContainingType <> currentLinkType Then
+                Dim wellKnownTupleRest As WellKnownMember = TupleTypeSymbol.GetTupleTypeMember(TupleTypeSymbol.RestPosition, TupleTypeSymbol.RestPosition)
+                Dim tupleRestField = DirectCast(TupleTypeSymbol.GetWellKnownMemberInType(currentLinkType.OriginalDefinition, wellKnownTupleRest, _diagnostics, syntax), FieldSymbol)
+                If tupleRestField Is Nothing Then
+                    ' error tolerance for cases when Rest is missing
+                    Return MakeBadFieldAccess(syntax, tupleField, rewrittenReceiver)
+                End If
+                ' make nested field accesses to Rest
+                Do
+                    Dim nestedFieldSymbol As FieldSymbol = tupleRestField.AsMember(currentLinkType)
+                    rewrittenReceiver = New BoundFieldAccess(syntax, rewrittenReceiver, nestedFieldSymbol, isLValue, nestedFieldSymbol.Type)
+                    currentLinkType = currentLinkType.TypeArgumentsNoUseSiteDiagnostics(TupleTypeSymbol.RestPosition - 1).TupleUnderlyingType
+                Loop While underlyingField.ContainingType <> currentLinkType
+            End If
+            ' make a field access for the most local access
+            Return New BoundFieldAccess(syntax, rewrittenReceiver, underlyingField, isLValue, underlyingField.Type)
+        End Function
+        Private Shared Function MakeBadFieldAccess(syntax As VisualBasicSyntaxNode, tupleField As FieldSymbol, rewrittenReceiver As BoundExpression) As BoundBadExpression
+            Return New BoundBadExpression(
+                                    syntax,
+                                    LookupResultKind.Empty,
+                                    ImmutableArray.Create(Of Symbol)(tupleField),
+                                    ImmutableArray.Create(Of BoundNode)(rewrittenReceiver),
+                                    tupleField.Type,
+                                    hasErrors:=True)
        End Function
    End Class
 End Namespace
--- a/src/Compilers/VisualBasic/Portable/Symbols/Tuples/TupleTypeSymbol.vb
+++ b/src/Compilers/VisualBasic/Portable/Symbols/Tuples/TupleTypeSymbol.vb
@@ -407,7 +407,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.Symbols
                End If
            Next
-            If modifiers.IsDefault AndAlso Not modifiers(TupleTypeSymbol.RestPosition - 1).IsDefaultOrEmpty Then
+            If Not modifiers.IsDefault AndAlso Not modifiers(TupleTypeSymbol.RestPosition - 1).IsDefaultOrEmpty Then
                typeArgumentsBuilder.Add(New TypeWithModifiers(extensionTuple, modifiers(TupleTypeSymbol.RestPosition - 1)))
            Else
                typeArgumentsBuilder.Add(New TypeWithModifiers(extensionTuple))
@@ -630,7 +630,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.Symbols
            Dim namesOfVirtualFields = ArrayBuilder(Of String).GetInstance(_elementTypes.Length)
            If _elementNames.IsDefault Then
-                For i As Integer = 1 To _elementTypes.Length - 1
+                For i As Integer = 1 To _elementTypes.Length
                    namesOfVirtualFields.Add(TupleMemberName(i))
                Next
            Else

--- a/src/Compilers/VisualBasic/Test/Emit/CodeGen/CodeGenTuples.vb
+++ b/src/Compilers/VisualBasic/Test/Emit/CodeGen/CodeGenTuples.vb
@@ -104,6 +104,56 @@ End Namespace
 ]]>)
        End Sub
+        <Fact()>
+        Public Sub TupleFieldBindingLong()
+            Dim verifier = CompileAndVerify(
+<compilation>
+    <file name="a.vb">
+Imports System
+Module C
+    Sub Main()
+        Dim t as (Integer, Integer, Integer, integer, integer, integer, integer, integer, integer, Integer, Integer, Integer, integer, integer, integer, integer, integer, integer)
+        t.Item17 = 42
+        t.Item12 = t.Item17
+        console.writeline(t.Item12)            
+    End Sub
+End Module
+    </file>
+</compilation>, expectedOutput:=<![CDATA[
+42
+            ]]>, additionalRefs:={ValueTupleRef, SystemRuntimeFacadeRef})
+            verifier.VerifyIL("C.Main", <![CDATA[
+{
+  // Code size       64 (0x40)
+  .maxstack  2
+  .locals init (System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)) V_0) //t
+  IL_0000:  ldloca.s   V_0
+  IL_0002:  ldflda     "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)"
+  IL_0007:  ldflda     "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer)"
+  IL_000c:  ldc.i4.s   42
+  IL_000e:  stfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer).Item3 As Integer"
+  IL_0013:  ldloca.s   V_0
+  IL_0015:  ldflda     "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)"
+  IL_001a:  ldloc.0
+  IL_001b:  ldfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)"
+  IL_0020:  ldfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer)"
+  IL_0025:  ldfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer).Item3 As Integer"
+  IL_002a:  stfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer)).Item5 As Integer"
+  IL_002f:  ldloc.0
+  IL_0030:  ldfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)"
+  IL_0035:  ldfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer)).Item5 As Integer"
+  IL_003a:  call       "Sub System.Console.WriteLine(Integer)"
+  IL_003f:  ret
+}
+]]>)
+        End Sub
        <Fact()>
        Public Sub TupleNamedFieldBinding()
@@ -152,6 +202,59 @@ End Namespace
  IL_001c:  call       "Sub System.Console.WriteLine(Integer)"
  IL_0021:  ret
 }
+]]>)
+        End Sub
+        <Fact()>
+        Public Sub TupleNamedFieldBindingLong()
+            Dim verifier = CompileAndVerify(
+<compilation>
+    <file name="a.vb">
+Imports System
+Module C
+    Sub Main()
+        Dim t as (a1 as Integer, a2 as Integer, a3 as Integer, a4 as integer, 
+                    a5 as integer, a6 as integer, a7 as integer, a8 as integer, 
+                    a9 as integer, a10 as Integer, a11 as Integer, a12 as Integer, 
+                    a13 as integer, a14 as integer, a15 as integer, a16 as integer, 
+                    a17 as integer, a18 as integer)
+        t.a17 = 42
+        t.a12 = t.a17
+        console.writeline(t.a12)            
+    End Sub
+End Module
+    </file>
+</compilation>, expectedOutput:=<![CDATA[
+42
+            ]]>, additionalRefs:={ValueTupleRef, SystemRuntimeFacadeRef})
+            verifier.VerifyIL("C.Main", <![CDATA[
+{
+  // Code size       64 (0x40)
+  .maxstack  2
+  .locals init (System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)) V_0) //t
+  IL_0000:  ldloca.s   V_0
+  IL_0002:  ldflda     "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)"
+  IL_0007:  ldflda     "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer)"
+  IL_000c:  ldc.i4.s   42
+  IL_000e:  stfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer).Item3 As Integer"
+  IL_0013:  ldloca.s   V_0
+  IL_0015:  ldflda     "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)"
+  IL_001a:  ldloc.0
+  IL_001b:  ldfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)"
+  IL_0020:  ldfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer)"
+  IL_0025:  ldfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer).Item3 As Integer"
+  IL_002a:  stfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer)).Item5 As Integer"
+  IL_002f:  ldloc.0
+  IL_0030:  ldfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)).Rest As (Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer)"
+  IL_0035:  ldfld      "System.ValueTuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, (Integer, Integer, Integer, Integer)).Item5 As Integer"
+  IL_003a:  call       "Sub System.Console.WriteLine(Integer)"
+  IL_003f:  ret
+}
 ]]>)
        End Sub