[compiler] Add ObjectRef::IsCodeT and ObjectRef::AsCodeT

Change-Id: I951bdf428a7429b3500757ae3fcfb029c814001a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3845631Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Darius Mercadier <dmercadier@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82669}

src/compiler/heap-refs.cc

@@ -1037,6 +1037,22 @@ ObjectData* JSHeapBroker::TryGetOrCreateData(Handle<Object> object,
 HEAP_BROKER_OBJECT_LIST(DEFINE_IS_AND_AS)
 #undef DEFINE_IS_AND_AS
 
+bool ObjectRef::IsCodeT() const {
+#ifdef V8_EXTERNAL_CODE_SPACE
+  return IsCodeDataContainer();
+#else
+  return IsCode();
+#endif
+}
+
+CodeTRef ObjectRef::AsCodeT() const {
+#ifdef V8_EXTERNAL_CODE_SPACE
+  return AsCodeDataContainer();
+#else
+  return AsCode();
+#endif
+}
+
 bool ObjectRef::IsSmi() const { return data()->is_smi(); }
 
 int ObjectRef::AsSmi() const {

src/compiler/heap-refs.h

@@ -237,6 +237,14 @@ class V8_EXPORT_PRIVATE ObjectRef {
   HEAP_BROKER_OBJECT_LIST(HEAP_AS_METHOD_DECL)
 #undef HEAP_AS_METHOD_DECL
 
+  // CodeT is defined as an alias to either CodeDataContainer or Code, depending
+  // on the architecture. We can't put it in HEAP_BROKER_OBJECT_LIST, because
+  // this list already contains CodeDataContainer and Code. Still, defining
+  // IsCodeT and AsCodeT is useful to write code that is independent of
+  // V8_EXTERNAL_CODE_SPACE.
+  bool IsCodeT() const;
+  CodeTRef AsCodeT() const;
+
   bool IsNull() const;
   bool IsNullOrUndefined() const;
   bool IsTheHole() const;