Add a util to print tag easily

runtime/core/tag.h

@@ -38,6 +38,20 @@ enum class Tag : uint32_t {
 #undef DEFINE_TAG
 };
 
+#if ET_ENABLE_ENUM_STRINGS
+inline const char* tag_to_string(Tag tag) {
+  switch (tag) {
+#define CASE_TAG(x) \
+  case Tag::x:      \
+    return #x;
+    EXECUTORCH_FORALL_TAGS(CASE_TAG)
+#undef CASE_TAG
+    default:
+      return "Unknown";
+  }
+}
+#endif // ET_ENABLE_ENUM_STRINGS
+
 /**
  * Convert a tag value to a string representation. If ET_ENABLE_ENUM_STRINGS is
  * set (it is on by default), this will return a string name (for example,

runtime/core/test/tag_test.cpp

@@ -37,6 +37,20 @@ TEST(TagToString, TagValues) {
   EXPECT_STREQ("Bool", name.data());
 }
 
+TEST(TagToString, PrintTag) {
+  const char* name = tag_to_string(Tag::Tensor);
+  EXPECT_STREQ("Tensor", name);
+
+  name = tag_to_string(Tag::Int);
+  EXPECT_STREQ("Int", name);
+
+  name = tag_to_string(Tag::Double);
+  EXPECT_STREQ("Double", name);
+
+  name = tag_to_string(Tag::Bool);
+  EXPECT_STREQ("Bool", name);
+}
+
 TEST(TagToString, TagNameBufferSize) {
   // Validate that kTagNameBufferSize is large enough to hold the all tag
   // strings without truncation.

runtime/core/test/targets.bzl

@@ -91,6 +91,9 @@ def define_common_targets():
         deps = [
             "//executorch/runtime/core:tag",
         ],
+        preprocessor_flags = [
+            "-DET_ENABLE_ENUM_STRINGS"
+        ],
     )
 
     if True in get_aten_mode_options():