IR: Require DICompositeType for ODR uniquing type map

Tighten up the API for debug info ODR type uniquing in LLVMContext.  The
only reason to allow other DIType subclasses is to make the unit tests
prettier :/.

llvm-svn: 266737

include/llvm/IR/LLVMContext.h

@@ -26,7 +26,7 @@ class Twine;
 class Instruction;
 class Module;
 class MDString;
-class DIType;
+class DICompositeType;
 class SMDiagnostic;
 class DiagnosticInfo;
 template <typename T> class SmallVectorImpl;
@@ -121,16 +121,16 @@ public:
   void enableDebugTypeODRUniquing();
   void disableDebugTypeODRUniquing();
 
-  /// Get or insert the DIType mapped to the given string.
+  /// Get or insert the DICompositeType mapped to the given string.
   ///
-  /// Returns the address of the current \a DIType pointer mapped to \c S,
-  /// inserting a mapping to \c nullptr if \c S was not previously mapped.
-  /// This method has no effect (and returns \c nullptr instead of a valid
-  /// address) if \a isODRUniquingDebugTypes() is \c false.
+  /// Returns the address of the current \a DICompositeType pointer mapped to
+  /// \c S, inserting a mapping to \c nullptr if \c S was not previously
+  /// mapped.  This method has no effect (and returns \c nullptr instead of a
+  /// valid address) if \a isODRUniquingDebugTypes() is \c false.
   ///
   /// \post If \a isODRUniquingDebugTypes(), \c S will have a (possibly null)
   /// mapping.  \note The returned address is only valid until the next call.
-  DIType **getOrInsertODRUniquedType(const MDString &S);
+  DICompositeType **getOrInsertODRUniquedType(const MDString &S);
 
   typedef void (*InlineAsmDiagHandlerTy)(const SMDiagnostic&, void *Context,
                                          unsigned LocCookie);

lib/AsmParser/LLParser.cpp

@@ -3841,7 +3841,7 @@ bool LLParser::ParseDICompositeType(MDNode *&Result, bool IsDistinct) {
 
   // If this isn't a forward declaration and it has a UUID, check for it in the
   // type map in the context.
-  DIType **MappedT = nullptr;
+  DICompositeType **MappedT = nullptr;
   if (!(flags.Val & DINode::FlagFwdDecl) && identifier.Val &&
       (MappedT = Context.getOrInsertODRUniquedType(*identifier.Val)) &&
       *MappedT) {
@@ -3857,7 +3857,7 @@ bool LLParser::ParseDICompositeType(MDNode *&Result, bool IsDistinct) {
        size.Val, align.Val, offset.Val, flags.Val, elements.Val,
        runtimeLang.Val, vtableHolder.Val, templateParams.Val, identifier.Val));
   if (MappedT)
-    *MappedT = cast<DIType>(Result);
+    *MappedT = cast<DICompositeType>(Result);
   return false;
 }
 

lib/Bitcode/Reader/BitcodeReader.cpp

@@ -2192,12 +2192,12 @@ std::error_code BitcodeReader::parseMetadata(bool ModuleLevel) {
       // mapping.
       unsigned Flags = Record[10];
       auto *Identifier = getMDString(Record[15]);
-      DIType **MappedT = nullptr;
+      DICompositeType **MappedT = nullptr;
       if (!(Flags & DINode::FlagFwdDecl) && Identifier)
         MappedT = Context.getOrInsertODRUniquedType(*Identifier);
 
       // Use the mapped type node, or create a new one if necessary.
-      DIType *CT = MappedT ? *MappedT : nullptr;
+      DICompositeType *CT = MappedT ? *MappedT : nullptr;
       if (!CT) {
         CT = GET_OR_DISTINCT(
             DICompositeType, Record[0],

lib/IR/LLVMContext.cpp

@@ -317,12 +317,13 @@ void LLVMContext::enableDebugTypeODRUniquing() {
   if (pImpl->DITypeMap)
     return;
 
-  pImpl->DITypeMap = llvm::make_unique<DenseMap<const MDString *, DIType *>>();
+  pImpl->DITypeMap =
+      llvm::make_unique<DenseMap<const MDString *, DICompositeType *>>();
 }
 
 void LLVMContext::disableDebugTypeODRUniquing() { pImpl->DITypeMap.reset(); }
 
-DIType **LLVMContext::getOrInsertODRUniquedType(const MDString &S) {
+DICompositeType **LLVMContext::getOrInsertODRUniquedType(const MDString &S) {
   if (!isODRUniquingDebugTypes())
     return nullptr;
   return &(*pImpl->DITypeMap)[&S];

lib/IR/LLVMContextImpl.h

@@ -1022,7 +1022,7 @@ public:
 #include "llvm/IR/Metadata.def"
 
   // Optional map for looking up composite types by identifier.
-  std::unique_ptr<DenseMap<const MDString *, DIType *>> DITypeMap;
+  std::unique_ptr<DenseMap<const MDString *, DICompositeType *>> DITypeMap;
 
   // MDNodes may be uniqued or not uniqued.  When they're not uniqued, they
   // aren't in the MDNodeSet, but they're still shared between objects, so no

unittests/IR/LLVMContextTest.cpp

@@ -32,18 +32,20 @@ TEST(LLVMContextTest, getOrInsertODRUniquedType) {
 
   // Get the mapping.
   Context.enableDebugTypeODRUniquing();
-  DIType **Mapping = Context.getOrInsertODRUniquedType(S);
+  DICompositeType **Mapping = Context.getOrInsertODRUniquedType(S);
   ASSERT_TRUE(Mapping);
 
   // Create some type and add it to the mapping.
-  auto &BT =
-      *DIBasicType::get(Context, dwarf::DW_TAG_unspecified_type, S.getString());
-  *Mapping = &BT;
+  auto &CT = *DICompositeType::get(Context, dwarf::DW_TAG_class_type, "name",
+                                   nullptr, 0, nullptr, nullptr, 0, 0, 0, 0,
+                                   nullptr, 0, nullptr, nullptr, S.getString());
+  ASSERT_EQ(S.getString(), CT.getIdentifier());
+  *Mapping = &CT;
 
   // Check that we get it back.
   Mapping = Context.getOrInsertODRUniquedType(S);
   ASSERT_TRUE(Mapping);
-  EXPECT_EQ(&BT, *Mapping);
+  EXPECT_EQ(&CT, *Mapping);
 
   // Check that it's discarded with the type map.
   Context.disableDebugTypeODRUniquing();