[clang][bytecode][NFC] Minor cleanups (llvm#129553)

Pull local variables in to the closest scope, remove some unnecessary
calls to getLocation() and remove an outdated comment.

Author: tbaederr

clang/lib/AST/ByteCode/Interp.cpp

@@ -551,8 +551,8 @@ bool CheckInitialized(InterpState &S, CodePtr OpPC, const Pointer &Ptr,
 
   if (const auto *VD = Ptr.getDeclDesc()->asVarDecl();
       VD && (VD->isConstexpr() || VD->hasGlobalStorage())) {
-    const SourceInfo &Loc = S.Current->getSource(OpPC);
     if (VD->getAnyInitializer()) {
+      const SourceInfo &Loc = S.Current->getSource(OpPC);
       S.FFDiag(Loc, diag::note_constexpr_var_init_non_constant, 1) << VD;
       S.Note(VD->getLocation(), diag::note_declared_at);
     } else {
@@ -722,7 +722,6 @@ bool CheckCallable(InterpState &S, CodePtr OpPC, const Function *F) {
   if (F->isLambdaStaticInvoker())
     return true;
 
-  const SourceLocation &Loc = S.Current->getLocation(OpPC);
   if (S.getLangOpts().CPlusPlus11) {
     const FunctionDecl *DiagDecl = F->getDecl();
 
@@ -748,7 +747,8 @@ bool CheckCallable(InterpState &S, CodePtr OpPC, const Function *F) {
     // or an inheriting constructor, we should be much more explicit about why
     // it's not constexpr.
     if (CD && CD->isInheritingConstructor()) {
-      S.FFDiag(Loc, diag::note_constexpr_invalid_inhctor, 1)
+      S.FFDiag(S.Current->getLocation(OpPC),
+               diag::note_constexpr_invalid_inhctor, 1)
           << CD->getInheritedConstructor().getConstructor()->getParent();
       S.Note(DiagDecl->getLocation(), diag::note_declared_at);
     } else {
@@ -766,7 +766,8 @@ bool CheckCallable(InterpState &S, CodePtr OpPC, const Function *F) {
           DiagDecl->hasBody())
         return false;
 
-      S.FFDiag(Loc, diag::note_constexpr_invalid_function, 1)
+      S.FFDiag(S.Current->getLocation(OpPC),
+               diag::note_constexpr_invalid_function, 1)
           << DiagDecl->isConstexpr() << (bool)CD << DiagDecl;
 
       if (DiagDecl->getDefinition())
@@ -776,7 +777,8 @@ bool CheckCallable(InterpState &S, CodePtr OpPC, const Function *F) {
         S.Note(DiagDecl->getLocation(), diag::note_declared_at);
     }
   } else {
-    S.FFDiag(Loc, diag::note_invalid_subexpr_in_const_expr);
+    S.FFDiag(S.Current->getLocation(OpPC),
+             diag::note_invalid_subexpr_in_const_expr);
   }
 
   return false;
@@ -980,11 +982,6 @@ bool CheckNonNullArgs(InterpState &S, CodePtr OpPC, const Function *F,
   return true;
 }
 
-// FIXME: This is similar to code we already have in Compiler.cpp.
-// I think it makes sense to instead add the field and base destruction stuff
-// to the destructor Function itself. Then destroying a record would really
-// _just_ be calling its destructor. That would also help with the diagnostic
-// difference when the destructor or a field/base fails.
 static bool runRecordDestructor(InterpState &S, CodePtr OpPC,
                                 const Pointer &BasePtr,
                                 const Descriptor *Desc) {
@@ -1095,8 +1092,8 @@ bool Free(InterpState &S, CodePtr OpPC, bool DeleteIsArrayForm,
 
     // For a class type with a virtual destructor, the selected operator delete
     // is the one looked up when building the destructor.
-    QualType AllocType = Ptr.getType();
     if (!DeleteIsArrayForm && !IsGlobalDelete) {
+      QualType AllocType = Ptr.getType();
       auto getVirtualOperatorDelete = [](QualType T) -> const FunctionDecl * {
         if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
           if (const CXXDestructorDecl *DD = RD->getDestructor())

clang/lib/AST/ByteCode/Pointer.cpp

@@ -384,7 +384,6 @@ void Pointer::initialize() const {
     return;
 
   assert(PointeeStorage.BS.Pointee && "Cannot initialize null pointer");
-  const Descriptor *Desc = getFieldDesc();
 
   if (isRoot() && PointeeStorage.BS.Base == sizeof(GlobalInlineDescriptor)) {
     GlobalInlineDescriptor &GD = *reinterpret_cast<GlobalInlineDescriptor *>(
@@ -393,6 +392,7 @@ void Pointer::initialize() const {
     return;
   }
 
+  const Descriptor *Desc = getFieldDesc();
   assert(Desc);
   if (Desc->isPrimitiveArray()) {
     // Primitive global arrays don't have an initmap.