Move MessageInit function to cc_library

This allows rust generator to use this function directly in order to generate symbol names for Message MiniTables.

PiperOrigin-RevId: 584054361

upb_generator/BUILD

@@ -102,6 +102,7 @@ bootstrap_cc_library(
     copts = UPB_DEFAULT_CPPOPTS,
     visibility = ["//protos_generator:__pkg__"],
     deps = [
+        ":mangle",
         "//upb:mini_table",
         "//upb:mini_table_internal",
         "//upb:port",
@@ -190,6 +191,20 @@ bootstrap_cc_library(
     ],
 )
 
+cc_library(
+    name = "mangle",
+    srcs = ["mangle.cc"],
+    hdrs = ["mangle.h"],
+    copts = UPB_DEFAULT_CPPOPTS,
+    visibility = [
+        "//rust:__subpackages__",
+        "//upb:friends",
+    ],
+    deps = [
+        "@com_google_absl//absl/strings",
+    ],
+)
+
 cc_binary(
     name = "libupb_generator.so",
     srcs = ["upb_generator_so.c"],

upb_generator/common.cc

@@ -21,15 +21,11 @@
 #include "upb/mini_table/field.h"
 #include "upb/mini_table/internal/field.h"
 #include "upb/reflection/def.hpp"
+#include "upb_generator/mangle.h"
 
 // Must be last
 #include "upb/port/def.inc"
 
-// Generate a mangled C name for a proto object.
-static std::string MangleName(absl::string_view name) {
-  return absl::StrReplaceAll(name, {{"_", "_0"}, {".", "__"}});
-}
-
 namespace upb {
 namespace generator {
 
@@ -60,10 +56,6 @@ void EmitFileWarning(absl::string_view name, Output& output) {
       name);
 }
 
-std::string MessageInit(absl::string_view full_name) {
-  return MangleName(full_name) + "_msg_init";
-}
-
 std::string MessageInitName(upb::MessageDefPtr descriptor) {
   return MessageInit(descriptor.full_name());
 }

upb_generator/mangle.cc

@@ -0,0 +1,21 @@
+#include "upb_generator/mangle.h"
+
+#include <string>
+
+#include "absl/strings/str_replace.h"
+#include "absl/strings/string_view.h"
+
+// Generate a mangled C name for a proto object.
+static std::string MangleName(absl::string_view name) {
+  return absl::StrReplaceAll(name, {{"_", "_0"}, {".", "__"}});
+}
+
+namespace upb {
+namespace generator {
+
+std::string MessageInit(absl::string_view full_name) {
+  return MangleName(full_name) + "_msg_init";
+}
+
+}  // namespace generator
+}  // namespace upb

upb_generator/mangle.h

@@ -0,0 +1,16 @@
+#ifndef THIRD_PARTY_UPB_UPB_GENERATOR_MANGLE_H_
+#define THIRD_PARTY_UPB_UPB_GENERATOR_MANGLE_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+namespace upb {
+namespace generator {
+
+std::string MessageInit(absl::string_view full_name);
+
+}  // namespace generator
+}  // namespace upb
+
+#endif  // THIRD_PARTY_UPB_UPB_GENERATOR_MANGLE_H_