[ADT] Deprecate PointerUnion::{is,get} (NFC)

[kazutakahirata]

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

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

This patch actually deprecates them with [[deprecated]].

I'm not touching PointerUnion::dyn_cast for now because we have not
migrated away from it yet.

[llvmbot]

@llvm/pr-subscribers-llvm-adt

Author: Kazu Hirata (kazutakahirata)

Changes

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>

This patch actually deprecates them with LLVM_DEPRECATED.

I'm not touching PointerUnion::dyn_cast for now because we have not
migrated away from it yet.

---

Full diff: https://github.com/llvm/llvm-project/pull/122623.diff

1 Files Affected:

• (modified) llvm/include/llvm/ADT/PointerUnion.h (+8-2)

diff --git a/llvm/include/llvm/ADT/PointerUnion.h b/llvm/include/llvm/ADT/PointerUnion.h
index 7d4ed02b622626..ac733066a0ac82 100644
--- a/llvm/include/llvm/ADT/PointerUnion.h
+++ b/llvm/include/llvm/ADT/PointerUnion.h
@@ -147,12 +147,18 @@ class PointerUnion
   //        isa<T>, cast<T> and the llvm::dyn_cast<T>
 
   /// Test if the Union currently holds the type matching T.
-  template <typename T> inline bool is() const { return isa<T>(*this); }
+  template <typename T>
+  LLVM_DEPRECATED("Use isa instead", "isa")
+  inline bool is() const {
+    return isa<T>(*this);
+  }
 
   /// Returns the value of the specified pointer type.
   ///
   /// If the specified pointer type is incorrect, assert.
-  template <typename T> inline T get() const {
+  template <typename T>
+  LLVM_DEPRECATED("Use cast instead", "cast")
+  inline T get() const {
     assert(isa<T>(*this) && "Invalid accessor called");
     return cast<T>(*this);
   }

[kazutakahirata]

This PR needs to be merged after #122622.

[nikic]

LGTM