Change how we keep track of which types are in the dest module.

Instead of keeping an explicit set, just drop the names of types we choose
to map to some other type.

This has the advantage that the name of the unused will not cause the context
to rename types on module read.

llvm-svn: 222986

1 files changed, 10 insertions, 13 deletions

diff --git a/llvm/lib/Linker/LinkModules.cpp b/llvm/lib/Linker/LinkModules.cpp
index 8822a3ae0a5..e1dd2e12d72 100644
--- a/llvm/lib/Linker/LinkModules.cpp
+++ b/llvm/lib/Linker/LinkModules.cpp
@@ -58,9 +58,8 @@ class TypeMapTy : public ValueMapTypeRemapper {
   SmallPtrSet<StructType*, 16> DstResolvedOpaqueTypes;
 
 public:
-  TypeMapTy(TypeSet &Set) : DstStructTypesSet(Set) {}
+  TypeMapTy() {}
 
-  TypeSet &DstStructTypesSet;
   /// Indicate that the specified type in the destination module is conceptually
   /// equivalent to the specified type in the source module.
   void addTypeMapping(Type *DstTy, Type *SrcTy);
@@ -111,6 +110,11 @@ void TypeMapTy::addTypeMapping(Type *DstTy, Type *SrcTy) {
                                    SpeculativeDstOpaqueTypes.size());
     for (StructType *Ty : SpeculativeDstOpaqueTypes)
       DstResolvedOpaqueTypes.erase(Ty);
+  } else {
+    for (Type *Ty : SpeculativeTypes)
+      if (auto *STy = dyn_cast<StructType>(Ty))
+        if (STy->hasName())
+          STy->setName("");
   }
   SpeculativeTypes.clear();
   SpeculativeDstOpaqueTypes.clear();
@@ -306,7 +310,6 @@ Type *TypeMapTy::get(Type *Ty) {
   if (STy->isOpaque()) {
     // A named structure type from src module is used. Add it to the Set of
     // identified structs in the destination module.
-    DstStructTypesSet.insert(STy);
     return *Entry = STy;
   }
 
@@ -314,7 +317,6 @@ Type *TypeMapTy::get(Type *Ty) {
   StructType *DTy = StructType::create(STy->getContext());
   // A new identified structure type was created. Add it to the set of
   // identified structs in the destination module.
-  DstStructTypesSet.insert(DTy);
   *Entry = DTy;
 
   SmallVector<Type*, 4> ElementTypes;
@@ -400,9 +402,9 @@ class ModuleLinker {
   Linker::DiagnosticHandlerFunction DiagnosticHandler;
 
 public:
-  ModuleLinker(Module *dstM, TypeSet &Set, Module *srcM,
+  ModuleLinker(Module *dstM, Module *srcM,
                Linker::DiagnosticHandlerFunction DiagnosticHandler)
-      : DstM(dstM), SrcM(srcM), TypeMap(Set),
+      : DstM(dstM), SrcM(srcM),
         ValMaterializer(TypeMap, DstM, LazilyLinkFunctions),
         DiagnosticHandler(DiagnosticHandler) {}
 
@@ -814,7 +816,7 @@ void ModuleLinker::computeTypeMapping() {
       // we prefer to take the '%C' version. So we are then left with both
       // '%C.1' and '%C' being used for the same types. This leads to some
       // variables using one type and some using the other.
-      if (!SrcStructTypesSet.count(DST) && TypeMap.DstStructTypesSet.count(DST))
+      if (!SrcStructTypesSet.count(DST))
         TypeMap.addTypeMapping(DST, ST);
   }
 
@@ -1576,10 +1578,6 @@ bool ModuleLinker::run() {
 void Linker::init(Module *M, DiagnosticHandlerFunction DiagnosticHandler) {
   this->Composite = M;
   this->DiagnosticHandler = DiagnosticHandler;
-
-  TypeFinder StructTypes;
-  StructTypes.run(*M, true);
-  IdentifiedStructTypes.insert(StructTypes.begin(), StructTypes.end());
 }
 
 Linker::Linker(Module *M, DiagnosticHandlerFunction DiagnosticHandler) {
@@ -1601,8 +1599,7 @@ void Linker::deleteModule() {
 }
 
 bool Linker::linkInModule(Module *Src) {
-  ModuleLinker TheLinker(Composite, IdentifiedStructTypes, Src,
-                         DiagnosticHandler);
+  ModuleLinker TheLinker(Composite, Src, DiagnosticHandler);
   return TheLinker.run();
 }