[opaque pointer type] Avoid using pointee types to retrieve InlineAsm's function type

As a stop-gap, retrieving the InlineAsm's function type was done via the
pointee type of its (pointer) Value type.

Instead, pass down and store the FunctionType in the InlineAsm object.

The only wrinkle with this is the ConstantUniqueMap, which then needs to
ferry the FunctionType down through the InlineAsmKeyType. This could be
done a bit differently if the ConstantInfo trait were broadened a bit to
provide an extension point for access to the TypeClass object from the
ValType objects, so that the ConstantUniqueMap<InlineAsm> would then be
keyed on FunctionTypes instead of PointerTypes that point to
FunctionTypes.

This drops the number of IR tests that don't roundtrip through bitcode*
without calling PointerType::getElementType from 416 to 8 (out of
10733). 3 of those crash when roundtripping at ToT anyway.

* modulo various unavoidable uses of pointer types when validating IR
  (for now) and in the way globals are parsed, unfortunately. These
  cases will either go away (because such validation will no longer be
  necessary or possible when pointee types are opaque), or have to be
  made simultaneously with the removal of pointee types.

llvm-svn: 243356

include/llvm/IR/InlineAsm.h

@@ -44,11 +44,12 @@ private:
   void operator=(const InlineAsm&) = delete;
 
   std::string AsmString, Constraints;
+  FunctionType *FTy;
   bool HasSideEffects;
   bool IsAlignStack;
   AsmDialect Dialect;
 
-  InlineAsm(PointerType *Ty, const std::string &AsmString,
+  InlineAsm(FunctionType *Ty, const std::string &AsmString,
             const std::string &Constraints, bool hasSideEffects,
             bool isAlignStack, AsmDialect asmDialect);
   ~InlineAsm() override;

lib/IR/ConstantsContext.h

@@ -373,41 +373,45 @@ template <class ConstantClass> struct ConstantAggrKeyType {
 struct InlineAsmKeyType {
   StringRef AsmString;
   StringRef Constraints;
+  FunctionType *FTy;
   bool HasSideEffects;
   bool IsAlignStack;
   InlineAsm::AsmDialect AsmDialect;
 
   InlineAsmKeyType(StringRef AsmString, StringRef Constraints,
-                   bool HasSideEffects, bool IsAlignStack,
+                   FunctionType *FTy, bool HasSideEffects, bool IsAlignStack,
                    InlineAsm::AsmDialect AsmDialect)
-      : AsmString(AsmString), Constraints(Constraints),
+      : AsmString(AsmString), Constraints(Constraints), FTy(FTy),
         HasSideEffects(HasSideEffects), IsAlignStack(IsAlignStack),
         AsmDialect(AsmDialect) {}
   InlineAsmKeyType(const InlineAsm *Asm, SmallVectorImpl<Constant *> &)
       : AsmString(Asm->getAsmString()), Constraints(Asm->getConstraintString()),
-        HasSideEffects(Asm->hasSideEffects()),
+        FTy(Asm->getFunctionType()), HasSideEffects(Asm->hasSideEffects()),
         IsAlignStack(Asm->isAlignStack()), AsmDialect(Asm->getDialect()) {}
 
   bool operator==(const InlineAsmKeyType &X) const {
     return HasSideEffects == X.HasSideEffects &&
            IsAlignStack == X.IsAlignStack && AsmDialect == X.AsmDialect &&
-           AsmString == X.AsmString && Constraints == X.Constraints;
+           AsmString == X.AsmString && Constraints == X.Constraints &&
+           FTy == X.FTy;
   }
   bool operator==(const InlineAsm *Asm) const {
     return HasSideEffects == Asm->hasSideEffects() &&
            IsAlignStack == Asm->isAlignStack() &&
            AsmDialect == Asm->getDialect() &&
            AsmString == Asm->getAsmString() &&
-           Constraints == Asm->getConstraintString();
+           Constraints == Asm->getConstraintString() &&
+           FTy == Asm->getFunctionType();
   }
   unsigned getHash() const {
     return hash_combine(AsmString, Constraints, HasSideEffects, IsAlignStack,
-                        AsmDialect);
+                        AsmDialect, FTy);
   }
 
   typedef ConstantInfo<InlineAsm>::TypeClass TypeClass;
   InlineAsm *create(TypeClass *Ty) const {
-    return new InlineAsm(Ty, AsmString, Constraints, HasSideEffects,
+    assert(PointerType::getUnqual(FTy) == Ty);
+    return new InlineAsm(FTy, AsmString, Constraints, HasSideEffects,
                          IsAlignStack, AsmDialect);
   }
 };

lib/IR/InlineAsm.cpp

@@ -24,23 +24,22 @@ using namespace llvm;
 InlineAsm::~InlineAsm() {
 }
 
-
-InlineAsm *InlineAsm::get(FunctionType *Ty, StringRef AsmString,
+InlineAsm *InlineAsm::get(FunctionType *FTy, StringRef AsmString,
                           StringRef Constraints, bool hasSideEffects,
                           bool isAlignStack, AsmDialect asmDialect) {
-  InlineAsmKeyType Key(AsmString, Constraints, hasSideEffects, isAlignStack,
-                       asmDialect);
-  LLVMContextImpl *pImpl = Ty->getContext().pImpl;
-  return pImpl->InlineAsms.getOrCreate(PointerType::getUnqual(Ty), Key);
+  InlineAsmKeyType Key(AsmString, Constraints, FTy, hasSideEffects,
+                       isAlignStack, asmDialect);
+  LLVMContextImpl *pImpl = FTy->getContext().pImpl;
+  return pImpl->InlineAsms.getOrCreate(PointerType::getUnqual(FTy), Key);
 }
 
-InlineAsm::InlineAsm(PointerType *Ty, const std::string &asmString,
+InlineAsm::InlineAsm(FunctionType *FTy, const std::string &asmString,
                      const std::string &constraints, bool hasSideEffects,
                      bool isAlignStack, AsmDialect asmDialect)
-  : Value(Ty, Value::InlineAsmVal),
-    AsmString(asmString), Constraints(constraints),
-    HasSideEffects(hasSideEffects), IsAlignStack(isAlignStack),
-    Dialect(asmDialect) {
+    : Value(PointerType::getUnqual(FTy), Value::InlineAsmVal),
+      AsmString(asmString), Constraints(constraints), FTy(FTy),
+      HasSideEffects(hasSideEffects), IsAlignStack(isAlignStack),
+      Dialect(asmDialect) {
 
   // Do various checks on the constraint string and type.
   assert(Verify(getFunctionType(), constraints) &&
@@ -53,7 +52,7 @@ void InlineAsm::destroyConstant() {
 }
 
 FunctionType *InlineAsm::getFunctionType() const {
-  return cast<FunctionType>(getType()->getElementType());
+  return FTy;
 }
     
 ///Default constructor.