[clang][Interp][NFC] Make InlineDescriptor::Desc const

Author: tbaederr

clang/lib/AST/Interp/Descriptor.cpp

@@ -262,7 +262,7 @@ Descriptor::Descriptor(const DeclTy &D, PrimType Type, bool IsTemporary,
 }
 
 /// Arrays of composite elements.
-Descriptor::Descriptor(const DeclTy &D, Descriptor *Elem, MetadataSize MD,
+Descriptor::Descriptor(const DeclTy &D, const Descriptor *Elem, MetadataSize MD,
                        unsigned NumElems, bool IsConst, bool IsTemporary,
                        bool IsMutable)
     : Source(D), ElemSize(Elem->getAllocSize() + sizeof(InlineDescriptor)),

clang/lib/AST/Interp/Descriptor.h

@@ -72,7 +72,7 @@ struct InlineDescriptor {
   /// Flag indicating if the field is mutable (if in a record).
   unsigned IsFieldMutable : 1;
 
-  Descriptor *Desc;
+  const Descriptor *Desc;
 };
 
 /// Describes a memory block created by an allocation site.
@@ -102,7 +102,7 @@ struct Descriptor final {
   /// Pointer to the record, if block contains records.
   Record *const ElemRecord = nullptr;
   /// Descriptor of the array element.
-  Descriptor *const ElemDesc = nullptr;
+  const Descriptor *const ElemDesc = nullptr;
   /// Flag indicating if the block is mutable.
   const bool IsConst = false;
   /// Flag indicating if a field is mutable.
@@ -129,7 +129,7 @@ struct Descriptor final {
   Descriptor(const DeclTy &D, PrimType Type, bool IsTemporary, UnknownSize);
 
   /// Allocates a descriptor for an array of composites.
-  Descriptor(const DeclTy &D, Descriptor *Elem, MetadataSize MD,
+  Descriptor(const DeclTy &D, const Descriptor *Elem, MetadataSize MD,
              unsigned NumElems, bool IsConst, bool IsTemporary, bool IsMutable);
 
   /// Allocates a descriptor for an array of composites of unknown size.

clang/lib/AST/Interp/Pointer.cpp

@@ -94,7 +94,7 @@ APValue Pointer::toAPValue() const {
     Offset = CharUnits::Zero();
   } else {
     // Build the lvalue base from the block.
-    Descriptor *Desc = getDeclDesc();
+    const Descriptor *Desc = getDeclDesc();
     if (auto *VD = Desc->asValueDecl())
       Base = VD;
     else if (auto *E = Desc->asExpr())

clang/lib/AST/Interp/Pointer.h

@@ -184,7 +184,8 @@ class Pointer {
 
     // Step into the containing array, if inside one.
     unsigned Next = Base - getInlineDesc()->Offset;
-    Descriptor *Desc = Next == 0 ? getDeclDesc() : getDescriptor(Next)->Desc;
+    const Descriptor *Desc =
+        Next == 0 ? getDeclDesc() : getDescriptor(Next)->Desc;
     if (!Desc->IsArray)
       return *this;
     return Pointer(Pointee, Next, Offset);
@@ -198,7 +199,7 @@ class Pointer {
   bool isField() const { return Base != 0 && Base != RootPtrMark; }
 
   /// Accessor for information about the declaration site.
-  Descriptor *getDeclDesc() const { return Pointee->Desc; }
+  const Descriptor *getDeclDesc() const { return Pointee->Desc; }
   SourceLocation getDeclLoc() const { return getDeclDesc()->getLocation(); }
 
   /// Returns a pointer to the object of which this pointer is a field.
@@ -222,7 +223,7 @@ class Pointer {
   }
 
   /// Accessors for information about the innermost field.
-  Descriptor *getFieldDesc() const {
+  const Descriptor *getFieldDesc() const {
     if (Base == 0 || Base == RootPtrMark)
       return getDeclDesc();
     return getInlineDesc()->Desc;