IRGen: Bind local type metadata from conformance's type in a conditional conformance's instantiation function

rdar://43096256
SR-8495

Author: aschwaighofer

lib/IRGen/GenProto.cpp

@@ -2031,6 +2031,8 @@ llvm::Constant *WitnessTableBuilder::buildInstantiationFunction() {
   Explosion params = IGF.collectParameters();
   Address wtable(params.claimNext(), PointerAlignment);
   llvm::Value *metadata = params.claimNext();
+  IGF.bindLocalTypeDataFromTypeMetadata(ConcreteType, IsExact, metadata,
+                                        MetadataState::Complete);
   llvm::Value *instantiationArgs = params.claimNext();
   Address conditionalTables(
       IGF.Builder.CreateBitCast(instantiationArgs,

test/IRGen/associated_type_witness.swift

@@ -195,8 +195,8 @@ struct GenericComputed<T: P> : DerivedFromSimpleAssoc {
 }
 
 //   Instantiation function for GenericComputed : DerivedFromSimpleAssoc.
-// CHECK-LABEL: define internal void @"$S23associated_type_witness15GenericComputedVyxGAA22DerivedFromSimpleAssocAAWI"(i8**, %swift.type*, i8**)
-// CHECK:         [[T0:%.*]] = call i8** @"$S23associated_type_witness15GenericComputedVyxGAA14HasSimpleAssocAAWa"(%swift.type* %1, i8*** undef)
+// CHECK-LABEL: define internal void @"$S23associated_type_witness15GenericComputedVyxGAA22DerivedFromSimpleAssocAAWI"(i8**, %swift.type* %"GenericComputed<T>", i8**)
+// CHECK:         [[T0:%.*]] = call i8** @"$S23associated_type_witness15GenericComputedVyxGAA14HasSimpleAssocAAWa"(%swift.type* %"GenericComputed<T>", i8*** undef)
 // CHECK-NEXT:    [[T1:%.*]] = bitcast i8** [[T0]] to i8*
 // CHECK-NEXT:    [[T2:%.*]] = getelementptr inbounds i8*, i8** %0, i32 1
 // CHECK-NEXT:    store i8* [[T1]], i8** [[T2]], align 8

test/Inputs/conditional_conformance_basic_conformances.swift

@@ -259,9 +259,9 @@ public func double_concrete_concrete() {
 
 // witness table instantiator for Single : P1
 
-// CHECK-LABEL: define internal void @"$S42conditional_conformance_basic_conformances6SingleVyxGAA2P1A2A2P2RzlWI"(i8**, %swift.type*, i8**)
+// CHECK-LABEL: define internal void @"$S42conditional_conformance_basic_conformances6SingleVyxGAA2P1A2A2P2RzlWI"(i8**, %swift.type* %"Single<A>", i8**)
 // CHECK-NEXT:  entry:
-// CHECK-NEXT:    [[TABLES:%.*]] = bitcast i8** %2 to i8***
+// CHECK-NEXT:    [[TABLES:%.*]] = bitcast i8** %1 to i8***
 
 // CHECK-NEXT:    [[A_P2_SRC:%.*]] = getelementptr inbounds i8**, i8*** [[TABLES]], i32 0
 // CHECK-NEXT:    [[A_P2_DEST:%.*]] = getelementptr inbounds i8*, i8** %0, i32 -1
@@ -274,9 +274,9 @@ public func double_concrete_concrete() {
 
 // witness table instantiator for Double : P1
 
-// CHECK-LABEL: define internal void @"$S42conditional_conformance_basic_conformances6DoubleVyxq_GAA2P1A2A2P2RzAA2P3R_rlWI"(i8**, %swift.type*, i8**)
+// CHECK-LABEL: define internal void @"$S42conditional_conformance_basic_conformances6DoubleVyxq_GAA2P1A2A2P2RzAA2P3R_rlWI"(i8**, %swift.type* %"Double<B, C>", i8**)
 // CHECK-NEXT:  entry:
-// CHECK-NEXT:    [[TABLES:%.*]] = bitcast i8** %2 to i8***
+// CHECK-NEXT:    [[TABLES:%.*]] = bitcast i8** %1 to i8***
 
 // CHECK-NEXT:    [[B_P2_SRC:%.*]] = getelementptr inbounds i8**, i8*** [[TABLES]], i32 0
 // CHECK-NEXT:    [[B_P2_DEST:%.*]] = getelementptr inbounds i8*, i8** %0, i32 -1

test/Inputs/conditional_conformance_subclass.swift

@@ -178,9 +178,9 @@ public func subclassgenericconcrete() {
 
 // witness tabel instantiation function for Base : P1
 
-// CHECK-LABEL: define internal void @"$S32conditional_conformance_subclass4BaseCyxGAA2P1A2A2P2RzlWI"(i8**, %swift.type*, i8**)
+// CHECK-LABEL: define internal void @"$S32conditional_conformance_subclass4BaseCyxGAA2P1A2A2P2RzlWI"(i8**, %swift.type* %"Base<A>", i8**)
 // CHECK-NEXT:  entry:
-// CHECK-NEXT:    [[TABLES:%.*]] = bitcast i8** %2 to i8***
+// CHECK-NEXT:    [[TABLES:%.*]] = bitcast i8** %1 to i8***
 
 // CHECK-NEXT:    [[A_P2_SRC:%.*]] = getelementptr inbounds i8**, i8*** [[TABLES]], i32 0
 // CHECK-NEXT:    [[A_P2_DEST:%.*]] = getelementptr inbounds i8*, i8** %0, i32 -1

test/Inputs/conditional_conformance_with_assoc.swift

@@ -222,9 +222,9 @@ public func concrete_concrete() {
 
 // witness table instantiator for Double : P1
 
-// CHECK-LABEL: define internal void @"$S34conditional_conformance_with_assoc6DoubleVyxq_GAA2P1A2A2P3R_AA2P23AT2RpzAafH_AhaGP3AT3RPzrlWI"(i8**, %swift.type*, i8**)
+// CHECK-LABEL: define internal void @"$S34conditional_conformance_with_assoc6DoubleVyxq_GAA2P1A2A2P3R_AA2P23AT2RpzAafH_AhaGP3AT3RPzrlWI"(i8**, %swift.type* %"Double<B, C>", i8**)
 // CHECK-NEXT:  entry:
-// CHECK-NEXT:    [[TABLES:%.*]] = bitcast i8** %2 to i8***
+// CHECK-NEXT:    [[TABLES:%.*]] = bitcast i8** %1 to i8***
 
 // CHECK-NEXT:    [[C_P3_SRC:%.*]] = getelementptr inbounds i8**, i8*** [[TABLES]], i32 0
 // CHECK-NEXT:    [[C_P3_DEST:%.*]] = getelementptr inbounds i8*, i8** %0, i32 -1
@@ -247,3 +247,27 @@ public func concrete_concrete() {
 // CHECK-NEXT:    ret void
 // CHECK-NEXT:  }
 
+protocol Base {
+}
+
+protocol Sub : Base {
+  associatedtype S : Base
+}
+
+struct X<T> {
+}
+
+extension X: Base where T: Base { }
+extension X: Sub where T: Sub, T.S == T {
+   typealias S = X<T>
+}
+
+// Make sure we can recover the type metadata from X<T>.Type.
+// CHECK: define internal void @"$S34conditional_conformance_with_assoc1XVyxGAA3SubA2aERz1SQzRszlWI"(i8**, %swift.type* %"X<T>", i8**)
+// CHECK: entry:
+// CHECK:   [[XT_TYPE:%.*]] = bitcast %swift.type* %"X<T>" to %swift.type**
+// CHECK:   [[ADDR:%.*]] = getelementptr inbounds %swift.type*, %swift.type** [[XT_TYPE]], i64 2
+// CHECK:   [[T:%.*]] = load %swift.type*, %swift.type** [[ADDR]]
+// CHECK:   %T.Base = call swiftcc i8** {{.*}}(%swift.type* %T, %swift.type* %T, i8** {{.*}})
+// CHECK:   ret void
+// CHECK: }