Revert "Merge pull request #6092 from swiftix/wip-generics-inlining-flag-4"

This reverts commit 1b3d29a, reversing
changes made to b324249.

We're seeing a handful of issues from turning on inlining of generics,
so I'm reverting to unblock the bots.

Author: jrose-apple

include/swift/SIL/SILModule.h

@@ -430,19 +430,12 @@ class SILModule {
   bool linkFunction(StringRef Name,
                     LinkingMode LinkAll = LinkingMode::LinkNormal);
 
-  /// Check if a given function exists in any of the modules with a
-  /// required linkage, i.e. it can be linked by linkFunction.
-  ///
-  /// If linkage parameter is none, then the linkage of the function
-  /// with a given name does not matter.
+  /// Check if a given function exists in the module,
+  /// i.e. it can be linked by linkFunction.
   ///
   /// \return null if this module has no such function. Otherwise
   /// the declaration of a function.
-  SILFunction *findFunction(StringRef Name, Optional<SILLinkage> Linkage);
-
-  /// Check if a given function exists in the module,
-  /// i.e. it can be linked by linkFunction.
-  bool hasFunction(StringRef Name);
+  SILFunction *hasFunction(StringRef Name, SILLinkage Linkage);
 
   /// Link in all Witness Tables in the module.
   void linkAllWitnessTables();

include/swift/SILOptimizer/Utils/Devirtualize.h

@@ -46,7 +46,6 @@ typedef std::pair<ValueBase *, ApplySite> DevirtualizationResult;
 DevirtualizationResult tryDevirtualizeApply(FullApplySite AI);
 DevirtualizationResult tryDevirtualizeApply(FullApplySite AI,
                                             ClassHierarchyAnalysis *CHA);
-bool canDevirtualizeApply(FullApplySite AI, ClassHierarchyAnalysis *CHA);
 bool isNominalTypeWithUnboundGenericParameters(SILType Ty, SILModule &M);
 bool canDevirtualizeClassMethod(FullApplySite AI, SILType ClassInstanceType);
 SILFunction *getTargetClassMethod(SILModule &M, SILType ClassOrMetatypeType,

include/swift/Serialization/SerializedSILLoader.h

@@ -92,8 +92,8 @@ class SerializedSILLoader {
   SILFunction *lookupSILFunction(SILFunction *Callee);
   SILFunction *
   lookupSILFunction(StringRef Name, bool declarationOnly = false,
-                    Optional<SILLinkage> linkage = None);
-  bool hasSILFunction(StringRef Name, Optional<SILLinkage> linkage = None);
+                    SILLinkage linkage = SILLinkage::Private);
+  bool hasSILFunction(StringRef Name, SILLinkage linkage = SILLinkage::Private);
   SILVTable *lookupVTable(Identifier Name);
   SILVTable *lookupVTable(const ClassDecl *C) {
     return lookupVTable(C->getName());

lib/AST/Substitution.cpp

@@ -97,26 +97,13 @@ Substitution Substitution::subst(ModuleDecl *module,
     // conformances from thin air.  FIXME: gross.
     if (!conformance &&
         proto->isSpecificProtocol(KnownProtocolKind::AnyObject)) {
-      auto archetype =
-        dyn_cast<ArchetypeType>(substReplacement->getCanonicalType());
-      // If classDecl is not nullptr, it is a concrete class.
-      auto classDecl = substReplacement->getClassOrBoundGenericClass();
-      if (!classDecl && archetype->getSuperclass()) {
-        // Replacement type is an archetype with a superclass constraint.
-        classDecl = archetype->getSuperclass()->getClassOrBoundGenericClass();
-        assert(classDecl);
-      }
-      if (classDecl) {
-        // Create a concrete conformance based on the conforming class.
-        SmallVector<ProtocolConformance *, 1> lookupResults;
-        classDecl->lookupConformance(classDecl->getParentModule(), proto,
-                                     lookupResults);
-        conformance = ProtocolConformanceRef(lookupResults.front());
-      } else if (archetype && archetype->requiresClass()) {
-        // Replacement type is an archetype with a class constraint.
-        // Create an abstract conformance.
-        conformance = ProtocolConformanceRef(proto);
-      }
+      auto classDecl
+        = substReplacement->getClassOrBoundGenericClass();
+      assert(classDecl);
+      SmallVector<ProtocolConformance *, 1> lookupResults;
+      classDecl->lookupConformance(classDecl->getParentModule(),
+                                   proto, lookupResults);
+      conformance = ProtocolConformanceRef(lookupResults.front());
     }
 
     assert(conformance);

lib/IRGen/IRGenSIL.cpp

@@ -731,34 +731,19 @@ class IRGenSILFunction :
     copy.push_back(alloca.getAddress());
   }
 
-  /// Determine whether a generic variable has been inlined.
-  static bool isInlinedGeneric(VarDecl *VarDecl, const SILDebugScope *DS) {
-    if (!DS->InlinedCallSite)
-      return false;
-    if (VarDecl->hasType())
-      return VarDecl->getType()->hasArchetype();
-    return VarDecl->getInterfaceType()->hasTypeParameter();
-  }
-
   /// Emit debug info for a function argument or a local variable.
   template <typename StorageType>
   void emitDebugVariableDeclaration(StorageType Storage,
                                     DebugTypeInfo Ty,
                                     SILType SILTy,
                                     const SILDebugScope *DS,
-                                    VarDecl *VarDecl,
+                                    ValueDecl *VarDecl,
                                     StringRef Name,
                                     unsigned ArgNo = 0,
                                     IndirectionKind Indirection = DirectValue) {
     // Force all archetypes referenced by the type to be bound by this point.
     // TODO: just make sure that we have a path to them that the debug info
     //       can follow.
-
-    // FIXME: The debug info type of all inlined instances of a variable must be
-    // the same as the type of the abstract variable.
-    if (isInlinedGeneric(VarDecl, DS))
-      return;
-
     auto runtimeTy = getRuntimeReifiedType(IGM,
                                            Ty.getType()->getCanonicalType());
     if (!IGM.IRGen.Opts.Optimize && runtimeTy->hasArchetype())
@@ -3769,10 +3754,6 @@ void IRGenSILFunction::visitAllocBoxInst(swift::AllocBoxInst *i) {
         CurSILFn->getDeclContext(), Decl,
         i->getBoxType()->getFieldType(IGM.getSILModule(), 0).getSwiftType(),
           type, /*Unwrap=*/false);
-
-    if (isInlinedGeneric(Decl, i->getDebugScope()))
-      return;
-
     IGM.DebugInfo->emitVariableDeclaration(
         Builder,
         emitShadowCopy(boxWithAddr.getAddress(), i->getDebugScope(), Name, 0),

lib/SIL/Linker.cpp

@@ -117,8 +117,7 @@ SILFunction *SILLinkerVisitor::lookupFunction(StringRef Name,
 }
 
 /// Process Decl, recursively deserializing any thing Decl may reference.
-bool SILLinkerVisitor::hasFunction(StringRef Name,
-                                   Optional<SILLinkage> Linkage) {
+bool SILLinkerVisitor::hasFunction(StringRef Name, SILLinkage Linkage) {
   return Loader->hasSILFunction(Name, Linkage);
 }
 

lib/SIL/Linker.h

@@ -60,7 +60,7 @@ class SILLinkerVisitor : public SILInstructionVisitor<SILLinkerVisitor, bool> {
 
   /// Process Name, try to check if there is a declaration of a function
   /// with this Name.
-  bool hasFunction(StringRef Name, Optional<SILLinkage> Linkage = None);
+  bool hasFunction(StringRef Name, SILLinkage Linkage);
 
   /// Deserialize the VTable mapped to C if it exists and all SIL the VTable
   /// transitively references.

lib/SIL/SILModule.cpp

@@ -499,39 +499,23 @@ bool SILModule::linkFunction(StringRef Name, SILModule::LinkingMode Mode) {
   return SILLinkerVisitor(*this, getSILLoader(), Mode).processFunction(Name);
 }
 
-/// Check if a given SIL linkage matches the required linkage.
-/// If the required linkage is Private, then anything matches it.
-static bool isMatchingLinkage(SILLinkage ActualLinkage,
-                              Optional<SILLinkage> Linkage) {
-  if (!Linkage)
-    return true;
-  return ActualLinkage == Linkage;
-}
-
-bool SILModule::hasFunction(StringRef Name) {
-  if (lookUpFunction(Name))
-    return true;
-  SILLinkerVisitor Visitor(*this, getSILLoader(),
-                           SILModule::LinkingMode::LinkNormal);
-  return Visitor.hasFunction(Name);
-}
-
-SILFunction *SILModule::findFunction(StringRef Name,
-                                     Optional<SILLinkage> Linkage) {
+SILFunction *SILModule::hasFunction(StringRef Name, SILLinkage Linkage) {
+  assert((Linkage == SILLinkage::Public ||
+          Linkage == SILLinkage::PublicExternal) &&
+         "Only a lookup of public functions is supported currently");
 
   SILFunction *F = nullptr;
-  SILLinkage RequiredLinkage = Linkage ? *Linkage : SILLinkage::Private;
 
   // First, check if there is a function with a required name in the
   // current module.
   SILFunction *CurF = lookUpFunction(Name);
 
   // Nothing to do if the current module has a required function
   // with a proper linkage already.
-  if (CurF && isMatchingLinkage(CurF->getLinkage(), Linkage)) {
+  if (CurF && CurF->getLinkage() == Linkage) {
     F = CurF;
   } else {
-    assert((!CurF || CurF->getLinkage() != RequiredLinkage) &&
+    assert((!CurF || CurF->getLinkage() != Linkage) &&
            "hasFunction should be only called for functions that are not "
            "contained in the SILModule yet or do not have a required linkage");
   }
@@ -544,7 +528,7 @@ SILFunction *SILModule::findFunction(StringRef Name,
       // name is present in the current module.
       // This is done to reduce the amount of IO from the
       // swift module file.
-      if (!Visitor.hasFunction(Name, RequiredLinkage))
+      if (!Visitor.hasFunction(Name, Linkage))
         return nullptr;
       // The function in the current module will be changed.
       F = CurF;
@@ -554,14 +538,13 @@ SILFunction *SILModule::findFunction(StringRef Name,
     // or if it is known to exist, perform a lookup.
     if (!F) {
       // Try to load the function from other modules.
-      F = Visitor.lookupFunction(Name, RequiredLinkage);
+      F = Visitor.lookupFunction(Name, Linkage);
       // Bail if nothing was found and we are not sure if
       // this function exists elsewhere.
       if (!F)
         return nullptr;
       assert(F && "SILFunction should be present in one of the modules");
-      assert(isMatchingLinkage(F->getLinkage(), Linkage) &&
-             "SILFunction has a wrong linkage");
+      assert(F->getLinkage() == Linkage && "SILFunction has a wrong linkage");
     }
   }
 
@@ -573,19 +556,9 @@ SILFunction *SILModule::findFunction(StringRef Name,
           SILOptions::SILOptMode::Optimize) {
     F->convertToDeclaration();
   }
-  if (F->isExternalDeclaration()) {
+  if (F->isExternalDeclaration())
     F->setFragile(IsFragile_t::IsNotFragile);
-    if (isAvailableExternally(F->getLinkage()) &&
-        !hasPublicVisibility(F->getLinkage()) && !Linkage) {
-      // We were just asked if a given function exists anywhere.
-      // It is not going to be used by the current module.
-      // Since external non-public function declarations should not
-      // exist, strip the "external" part from the linkage.
-      F->setLinkage(stripExternalFromLinkage(F->getLinkage()));
-    }
-  }
-  if (Linkage)
-    F->setLinkage(RequiredLinkage);
+  F->setLinkage(Linkage);
   return F;
 }
 

lib/SILOptimizer/IPO/EagerSpecializer.cpp

@@ -287,7 +287,7 @@ class EagerDispatch {
         substConv(ReInfo.getSubstitutedType(), GenericFunc->getModule()),
         Builder(*GenericFunc), Loc(GenericFunc->getLocation()) {
     Builder.setCurrentDebugScope(GenericFunc->getDebugScope());
-    IsClassF = Builder.getModule().findFunction(
+    IsClassF = Builder.getModule().hasFunction(
       "_swift_isClassOrObjCExistentialType", SILLinkage::PublicExternal);
     assert(IsClassF);
   }

lib/SILOptimizer/Transforms/FunctionSignatureOpts.cpp

@@ -93,7 +93,7 @@ static SILInstruction *findOnlyApply(SILFunction *F) {
 ///
 /// TODO: we should teach the demangler to understand this suffix.
 static std::string getUniqueName(std::string Name, SILModule &M) {
-  if (!M.hasFunction(Name))
+  if (!M.lookUpFunction(Name))
     return Name;
   return getUniqueName(Name + "_unique_suffix", M);
 }
@@ -372,7 +372,7 @@ std::string FunctionSignatureTransform::createOptimizedSILFunctionName() {
   do {
     New = NewFM.mangle(UniqueID);
     ++UniqueID;
-  } while (M.hasFunction(New));
+  } while (M.lookUpFunction(New));
 
   return NewMangling::selectMangling(Old, New);
 }