From 5e4bf8292ef0531f2b1aab45e3e4ee2b1d53527e Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu@google.com>
Date: Mon, 27 Jan 2025 11:46:26 -0800
Subject: [PATCH] [AST] Migrate away from PointerUnion::dyn_cast (NFC)

Note that PointerUnion::dyn_cast has 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>

This patch migrates uses of PointerUnion::dyn_cast to
dyn_cast_if_present (see the definition of PointerUnion::dyn_cast).
Note that we already have dyn_cast_if_present<T*>(ExplicitInfo)
elsewhere in ClassTemplateSpecializationDecl and
VarTemplateSpecializationDecl, meaning that ExplicitInfo is not
guaranteed to be nonnull in those classes.
---
 clang/include/clang/AST/DeclTemplate.h | 15 ++++++++++-----
 clang/lib/AST/DeclTemplate.cpp         |  4 ++--
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/clang/include/clang/AST/DeclTemplate.h b/clang/include/clang/AST/DeclTemplate.h
index caaa47d0a297c..9ecff2c898acd 100644
--- a/clang/include/clang/AST/DeclTemplate.h
+++ b/clang/include/clang/AST/DeclTemplate.h
@@ -2018,7 +2018,8 @@ class ClassTemplateSpecializationDecl : public CXXRecordDecl,
   /// Set the template argument list as written in the sources.
   void
   setTemplateArgsAsWritten(const ASTTemplateArgumentListInfo *ArgsWritten) {
-    if (auto *Info = ExplicitInfo.dyn_cast<ExplicitInstantiationInfo *>())
+    if (auto *Info =
+            dyn_cast_if_present<ExplicitInstantiationInfo *>(ExplicitInfo))
       Info->TemplateArgsAsWritten = ArgsWritten;
     else
       ExplicitInfo = ArgsWritten;
@@ -2032,7 +2033,8 @@ class ClassTemplateSpecializationDecl : public CXXRecordDecl,
 
   /// Gets the location of the extern keyword, if present.
   SourceLocation getExternKeywordLoc() const {
-    if (auto *Info = ExplicitInfo.dyn_cast<ExplicitInstantiationInfo *>())
+    if (auto *Info =
+            dyn_cast_if_present<ExplicitInstantiationInfo *>(ExplicitInfo))
       return Info->ExternKeywordLoc;
     return SourceLocation();
   }
@@ -2780,7 +2782,8 @@ class VarTemplateSpecializationDecl : public VarDecl,
   /// Retrieve the template argument list as written in the sources,
   /// if any.
   const ASTTemplateArgumentListInfo *getTemplateArgsAsWritten() const {
-    if (auto *Info = ExplicitInfo.dyn_cast<ExplicitInstantiationInfo *>())
+    if (auto *Info =
+            dyn_cast_if_present<ExplicitInstantiationInfo *>(ExplicitInfo))
       return Info->TemplateArgsAsWritten;
     return cast<const ASTTemplateArgumentListInfo *>(ExplicitInfo);
   }
@@ -2803,7 +2806,8 @@ class VarTemplateSpecializationDecl : public VarDecl,
 
   /// Gets the location of the extern keyword, if present.
   SourceLocation getExternKeywordLoc() const {
-    if (auto *Info = ExplicitInfo.dyn_cast<ExplicitInstantiationInfo *>())
+    if (auto *Info =
+            dyn_cast_if_present<ExplicitInstantiationInfo *>(ExplicitInfo))
       return Info->ExternKeywordLoc;
     return SourceLocation();
   }
@@ -2813,7 +2817,8 @@ class VarTemplateSpecializationDecl : public VarDecl,
 
   /// Gets the location of the template keyword, if present.
   SourceLocation getTemplateKeywordLoc() const {
-    if (auto *Info = ExplicitInfo.dyn_cast<ExplicitInstantiationInfo *>())
+    if (auto *Info =
+            dyn_cast_if_present<ExplicitInstantiationInfo *>(ExplicitInfo))
       return Info->TemplateKeywordLoc;
     return SourceLocation();
   }
diff --git a/clang/lib/AST/DeclTemplate.cpp b/clang/lib/AST/DeclTemplate.cpp
index de81bc64106f1..2e1ed9e10713a 100644
--- a/clang/lib/AST/DeclTemplate.cpp
+++ b/clang/lib/AST/DeclTemplate.cpp
@@ -1496,7 +1496,7 @@ SourceRange VarTemplateSpecializationDecl::getSourceRange() const {
 }
 
 void VarTemplateSpecializationDecl::setExternKeywordLoc(SourceLocation Loc) {
-  auto *Info = ExplicitInfo.dyn_cast<ExplicitInstantiationInfo *>();
+  auto *Info = dyn_cast_if_present<ExplicitInstantiationInfo *>(ExplicitInfo);
   if (!Info) {
     // Don't allocate if the location is invalid.
     if (Loc.isInvalid())
@@ -1509,7 +1509,7 @@ void VarTemplateSpecializationDecl::setExternKeywordLoc(SourceLocation Loc) {
 }
 
 void VarTemplateSpecializationDecl::setTemplateKeywordLoc(SourceLocation Loc) {
-  auto *Info = ExplicitInfo.dyn_cast<ExplicitInstantiationInfo *>();
+  auto *Info = dyn_cast_if_present<ExplicitInstantiationInfo *>(ExplicitInfo);
   if (!Info) {
     // Don't allocate if the location is invalid.
     if (Loc.isInvalid())