hpb: Migrate MoveMessage out of internal to interop

PiperOrigin-RevId: 673115936

hpb/BUILD

@@ -82,53 +82,19 @@ cc_library(
     copts = UPB_DEFAULT_CPPOPTS,
 )
 
-cc_library(
-    name = "internal",
-    hdrs = ["internal.h"],
-    copts = UPB_DEFAULT_CPPOPTS,
-    visibility = ["//upb:friends"],
-    deps = [
-        ":hpb",
-        "//upb:mem",
-        "//upb:message",
-        "//upb:mini_table",
-        "@com_google_absl//absl/status",
-        "@com_google_absl//absl/status:statusor",
-        "@com_google_absl//absl/strings:str_format",
-    ],
-)
-
 # Common support code for C++ generated code.
 cc_library(
     name = "generated_hpb_support",
-    hdrs = [
-        "internal.h",
-    ],
     copts = UPB_DEFAULT_CPPOPTS,
     visibility = ["//hpb/bazel:__pkg__"],
     deps = [
         ":hpb",
-        ":internal",
         ":repeated_field",
         "//upb:mem",
         "//upb:message",
     ],
 )
 
-cc_test(
-    name = "internal_test",
-    srcs = ["internal_test.cc"],
-    copts = UPB_DEFAULT_CPPOPTS,
-    deps = [
-        ":internal",
-        "//src/google/protobuf/compiler/hpb/tests:test_model_upb_cc_proto",
-        "//src/google/protobuf/compiler/hpb/tests:test_model_upb_proto",
-        "//upb:mem",
-        "@com_google_googletest//:gtest",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
 upb_cc_proto_library_copts(
     name = "upb_cc_proto_library_copts",
     copts = UPB_DEFAULT_CPPOPTS,

hpb/backend/upb/BUILD

@@ -5,6 +5,11 @@
 # license that can be found in the LICENSE file or at
 # https://developers.google.com/open-source/licenses/bsd
 
+load(
+    "//upb/bazel:build_defs.bzl",
+    "UPB_DEFAULT_CPPOPTS",
+)
+
 package(default_applicable_licenses = ["//:license"])
 
 cc_library(
@@ -35,3 +40,18 @@ cc_library(
         "//upb:mini_table",
     ],
 )
+
+cc_test(
+    name = "interop_test",
+    srcs = ["interop_test.cc"],
+    copts = UPB_DEFAULT_CPPOPTS,
+    deps = [
+        ":interop",
+        "//src/google/protobuf/compiler/hpb/tests:test_model_upb_cc_proto",
+        "//src/google/protobuf/compiler/hpb/tests:test_model_upb_proto",
+        "//upb:mem",
+        "//upb:message",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)

hpb/backend/upb/interop.h

@@ -18,6 +18,20 @@
 
 namespace hpb::interop::upb {
 
+/**
+ * Moves ownership of a message created in a source arena.
+ *
+ * Utility function to provide a way to move ownership across languages or VMs.
+ *
+ * Warning: any minitable skew will incur arbitrary memory access. Ensuring
+ * minitable compatibility is the responsibility of the caller.
+ */
+// TODO: b/365824801 - consider rename to OwnMessage
+template <typename T>
+T MoveMessage(upb_Message* msg, upb_Arena* arena) {
+  return T(msg, arena);
+}
+
 template <typename T>
 const upb_MiniTable* GetMiniTable(const T*) {
   return T::minitable();

hpb/backend/upb/interop_test.cc

@@ -5,19 +5,19 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
-#include "google/protobuf/hpb/internal.h"
+#include "google/protobuf/hpb/backend/upb/interop.h"
 
-#include <gmock/gmock.h>
 #include <gtest/gtest.h>
 #include "google/protobuf/compiler/hpb/tests/test_model.upb.h"
 #include "google/protobuf/compiler/hpb/tests/test_model.upb.proto.h"
 #include "upb/mem/arena.h"
+#include "upb/message/message.h"
 
 namespace hpb::testing {
 namespace {
 using ::hpb_unittest::protos::TestModel;
 
-TEST(CppGeneratedCode, InternalMoveMessage) {
+TEST(CppGeneratedCode, InteropMoveMessage) {
   // Generate message (simulating message created in another VM/language)
   upb_Arena* source_arena = upb_Arena_New();
   hpb_unittest_TestModel* message = hpb_unittest_TestModel_new(source_arena);
@@ -25,8 +25,8 @@ TEST(CppGeneratedCode, InternalMoveMessage) {
   hpb_unittest_TestModel_set_int_value_with_default(message, 123);
 
   // Move ownership.
-  TestModel model = hpb::internal::MoveMessage<TestModel>((upb_Message*)message,
-                                                          source_arena);
+  TestModel model = hpb::interop::upb::MoveMessage<TestModel>(
+      (upb_Message*)message, source_arena);
   // Now that we have moved ownership, free original arena.
   upb_Arena_Free(source_arena);
   EXPECT_EQ(model.int_value_with_default(), 123);

hpb/internal.h

@@ -1,25 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2023 Google LLC.  All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-
-#ifndef PROTOBUF_HPB_INTERNAL_H_
-#define PROTOBUF_HPB_INTERNAL_H_
-
-#include "upb/mem/arena.h"
-#include "upb/message/message.h"
-
-namespace hpb::internal {
-
-// Moves ownership of a message created in a source arena.
-//
-// Utility function to provide a way to move ownership across languages or VMs.
-template <typename T>
-T MoveMessage(upb_Message* msg, upb_Arena* arena) {
-  return T(msg, arena);
-}
-
-}  // namespace hpb::internal
-#endif

hpb_generator/gen_messages.cc

@@ -252,7 +252,8 @@ void WriteModelPublicDeclaration(
             const ::hpb::ExtensionRegistry& extension_registry, int options));
         friend upb_Arena* hpb::interop::upb::GetArena<$0>($0* message);
         friend upb_Arena* hpb::interop::upb::GetArena<$0>(::hpb::Ptr<$0> message);
-        friend $0(::hpb::internal::MoveMessage<$0>(upb_Message* msg, upb_Arena* arena));
+        friend $0(hpb::interop::upb::MoveMessage<$0>(upb_Message* msg,
+                                                     upb_Arena* arena));
       )cc",
       ClassName(descriptor), MessageName(descriptor),
       QualifiedClassName(descriptor));

hpb_generator/protoc-gen-upb-protos.cc

@@ -134,7 +134,6 @@ void WriteHeader(const protobuf::FileDescriptor* file, Output& output,
 #ifndef $0_HPB_PROTO_H_
 #define $0_HPB_PROTO_H_
 
-#include "google/protobuf/hpb/internal.h"
 #include "google/protobuf/hpb/repeated_field.h"
 
 #include "protos/protos.h"