[clang] [Index] Migrate away from PointerUnion::dyn_cast (NFC) (PR #124389)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

Note that PointerUnion::dyn_cast has been soft deprecated in
PointerUnion.h:

  // FIXME: Replace the uses of is(), get() and dyn_cast() with
  //        isa&lt;T&gt;, cast&lt;T&gt; and the llvm::dyn_cast&lt;T&gt;

Literal migration would result in dyn_cast_if_present (see the
definition of PointerUnion::dyn_cast), but this patch uses dyn_cast
because we expect DclInfo.DeclOrMacro to be nonnull.


---
Full diff: https://github.com/llvm/llvm-project/pull/124389.diff


1 Files Affected:

- (modified) clang/lib/Index/FileIndexRecord.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/Index/FileIndexRecord.cpp 
b/clang/lib/Index/FileIndexRecord.cpp
index 449c33637eb7e8..cf40a596f50943 100644
--- a/clang/lib/Index/FileIndexRecord.cpp
+++ b/clang/lib/Index/FileIndexRecord.cpp
@@ -55,7 +55,7 @@ void FileIndexRecord::removeHeaderGuardMacros() {
 void FileIndexRecord::print(llvm::raw_ostream &OS, SourceManager &SM) const {
   OS << "DECLS BEGIN ---\n";
   for (auto &DclInfo : Decls) {
-    if (const auto *D = DclInfo.DeclOrMacro.dyn_cast<const Decl *>()) {
+    if (const auto *D = dyn_cast<const Decl *>(DclInfo.DeclOrMacro)) {
       SourceLocation Loc = SM.getFileLoc(D->getLocation());
       PresumedLoc PLoc = SM.getPresumedLoc(Loc);
       OS << llvm::sys::path::filename(PLoc.getFilename()) << ':'

``````````

</details>


https://github.com/llvm/llvm-project/pull/124389
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