[clang] Migrate away from PointerUnion::{is,get} (NFC) (#119654)

Note that PointerUnion::{is,get} have been soft deprecated in
PointerUnion.h:

  // FIXME: Replace the uses of is(), get() and dyn_cast() with
  //        isa<T>, cast<T> and the llvm::dyn_cast<T>

I'm not touching PointerUnion::dyn_cast for now because it's a bit
complicated; we could blindly migrate it to dyn_cast_if_present, but
we should probably use dyn_cast when the operand is known to be
non-null.

Author: kazutakahirata

clang/include/clang/Lex/PreprocessingRecord.h

@@ -180,13 +180,13 @@ class Token;
     }
 
     /// True if it is a builtin macro.
-    bool isBuiltinMacro() const { return NameOrDef.is<IdentifierInfo *>(); }
+    bool isBuiltinMacro() const { return isa<IdentifierInfo *>(NameOrDef); }
 
     /// The name of the macro being expanded.
     const IdentifierInfo *getName() const {
       if (MacroDefinitionRecord *Def = getDefinition())
         return Def->getName();
-      return NameOrDef.get<IdentifierInfo *>();
+      return cast<IdentifierInfo *>(NameOrDef);
     }
 
     /// The definition of the macro being expanded. May return null if

clang/include/clang/Lex/Preprocessor.h

@@ -859,7 +859,7 @@ class Preprocessor {
       auto *Info = State.dyn_cast<ModuleMacroInfo*>();
       if (!Info) {
         Info = new (PP.getPreprocessorAllocator())
-            ModuleMacroInfo(State.get<MacroDirective *>());
+            ModuleMacroInfo(cast<MacroDirective *>(State));
         State = Info;
       }
 
@@ -892,7 +892,7 @@ class Preprocessor {
     MacroDirective *getLatest() const {
       if (auto *Info = State.dyn_cast<ModuleMacroInfo*>())
         return Info->MD;
-      return State.get<MacroDirective*>();
+      return cast<MacroDirective *>(State);
     }
 
     void setLatest(MacroDirective *MD) {
@@ -945,7 +945,7 @@ class Preprocessor {
         if (Overrides.empty())
           return;
         Info = new (PP.getPreprocessorAllocator())
-            ModuleMacroInfo(State.get<MacroDirective *>());
+            ModuleMacroInfo(cast<MacroDirective *>(State));
         State = Info;
       }
       Info->OverriddenMacros.clear();

clang/lib/Analysis/PathDiagnostic.cpp

@@ -484,10 +484,10 @@ SourceLocation PathDiagnosticLocation::getValidSourceLocation(
   // source code, so find an enclosing statement and use its location.
   if (!L.isValid()) {
     AnalysisDeclContext *ADC;
-    if (LAC.is<const LocationContext*>())
-      ADC = LAC.get<const LocationContext*>()->getAnalysisDeclContext();
+    if (auto *LC = dyn_cast<const LocationContext *>(LAC))
+      ADC = LC->getAnalysisDeclContext();
     else
-      ADC = LAC.get<AnalysisDeclContext*>();
+      ADC = cast<AnalysisDeclContext *>(LAC);
 
     ParentMap &PM = ADC->getParentMap();
 

clang/lib/Basic/FileManager.cpp

@@ -398,7 +398,7 @@ FileEntryRef FileManager::getVirtualFileRef(StringRef Filename, off_t Size,
       {Filename, std::errc::no_such_file_or_directory}).first;
   if (NamedFileEnt.second) {
     FileEntryRef::MapValue Value = *NamedFileEnt.second;
-    if (LLVM_LIKELY(Value.V.is<FileEntry *>()))
+    if (LLVM_LIKELY(isa<FileEntry *>(Value.V)))
       return FileEntryRef(NamedFileEnt);
     return FileEntryRef(*Value.V.get<const FileEntryRef::MapEntry *>());
   }

clang/lib/Index/FileIndexRecord.cpp

@@ -65,7 +65,7 @@ void FileIndexRecord::print(llvm::raw_ostream &OS, SourceManager &SM) const {
         OS << ' ' << ND->getDeclName();
       }
     } else {
-      const auto *MI = DclInfo.DeclOrMacro.get<const MacroInfo *>();
+      const auto *MI = cast<const MacroInfo *>(DclInfo.DeclOrMacro);
       SourceLocation Loc = SM.getFileLoc(MI->getDefinitionLoc());
       PresumedLoc PLoc = SM.getPresumedLoc(Loc);
       OS << llvm::sys::path::filename(PLoc.getFilename()) << ':'

clang/lib/Index/IndexDecl.cpp

@@ -665,9 +665,9 @@ class IndexingDeclVisitor : public ConstDeclVisitor<IndexingDeclVisitor, bool> {
                        ClassTemplatePartialSpecializationDecl *>
         Template = D->getSpecializedTemplateOrPartial();
     const Decl *SpecializationOf =
-        Template.is<ClassTemplateDecl *>()
+        isa<ClassTemplateDecl *>(Template)
             ? (Decl *)Template.get<ClassTemplateDecl *>()
-            : Template.get<ClassTemplatePartialSpecializationDecl *>();
+            : cast<ClassTemplatePartialSpecializationDecl *>(Template);
     if (!D->isThisDeclarationADefinition())
       IndexCtx.indexNestedNameSpecifierLoc(D->getQualifierLoc(), D);
     IndexCtx.indexTagDecl(

clang/tools/libclang/CIndex.cpp

@@ -5270,7 +5270,7 @@ CXString clang_getCursorSpelling(CXCursor C) {
       if (const OverloadExpr *E = Storage.dyn_cast<const OverloadExpr *>())
         return cxstring::createDup(E->getName().getAsString());
       OverloadedTemplateStorage *Ovl =
-          Storage.get<OverloadedTemplateStorage *>();
+          cast<OverloadedTemplateStorage *>(Storage);
       if (Ovl->size() == 0)
         return cxstring::createEmpty();
       return cxstring::createDup((*Ovl->begin())->getNameAsString());
@@ -7309,7 +7309,7 @@ unsigned clang_getNumOverloadedDecls(CXCursor C) {
           Storage.dyn_cast<OverloadedTemplateStorage *>())
     return S->size();
 
-  const Decl *D = Storage.get<const Decl *>();
+  const Decl *D = cast<const Decl *>(Storage);
   if (const UsingDecl *Using = dyn_cast<UsingDecl>(D))
     return Using->shadow_size();
 
@@ -7332,7 +7332,7 @@ CXCursor clang_getOverloadedDecl(CXCursor cursor, unsigned index) {
           Storage.dyn_cast<OverloadedTemplateStorage *>())
     return MakeCXCursor(S->begin()[index], TU);
 
-  const Decl *D = Storage.get<const Decl *>();
+  const Decl *D = cast<const Decl *>(Storage);
   if (const UsingDecl *Using = dyn_cast<UsingDecl>(D)) {
     // FIXME: This is, unfortunately, linear time.
     UsingDecl::shadow_iterator Pos = Using->shadow_begin();

clang/tools/libclang/CIndexCXX.cpp

@@ -101,11 +101,11 @@ CXCursor clang_getSpecializedCursorTemplate(CXCursor C) {
       llvm::PointerUnion<ClassTemplateDecl *,
                          ClassTemplatePartialSpecializationDecl *> Result
         = ClassSpec->getSpecializedTemplateOrPartial();
-      if (Result.is<ClassTemplateDecl *>())
-        Template = Result.get<ClassTemplateDecl *>();
+      if (isa<ClassTemplateDecl *>(Result))
+        Template = cast<ClassTemplateDecl *>(Result);
       else
-        Template = Result.get<ClassTemplatePartialSpecializationDecl *>();
-      
+        Template = cast<ClassTemplatePartialSpecializationDecl *>(Result);
+
     } else 
       Template = CXXRecord->getInstantiatedFromMemberClass();
   } else if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {

clang/utils/TableGen/ClangDiagnosticsEmitter.cpp

@@ -362,7 +362,7 @@ void InferPedantic::compute(VecOrSet DiagsInPedantic,
     if (auto *V = DiagsInPedantic.dyn_cast<RecordVec *>())
       V->push_back(R);
     else
-      DiagsInPedantic.get<RecordSet *>()->insert(R);
+      cast<RecordSet *>(DiagsInPedantic)->insert(R);
   }
 
   if (!GroupsInPedantic)
@@ -389,7 +389,7 @@ void InferPedantic::compute(VecOrSet DiagsInPedantic,
     if (auto *V = GroupsInPedantic.dyn_cast<RecordVec *>())
       V->push_back(Group);
     else
-      GroupsInPedantic.get<RecordSet *>()->insert(Group);
+      cast<RecordSet *>(GroupsInPedantic)->insert(Group);
   }
 }