upb_generator/protoc-gen-upb_minitable.cc - third_party/protobuf - Git at Google

 // 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

 #include "upb_generator/protoc-gen-upb_minitable.h"

 #include <string.h>

 #include <algorithm>
 #include <cstddef>
 #include <cstdint>
 #include <cstdio>
 #include <cstdlib>
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>

 #include "absl/container/flat_hash_set.h"
 #include "absl/log/absl_check.h"
 #include "absl/strings/str_cat.h"
 #include "absl/strings/string_view.h"
 #include "absl/strings/substitute.h"
 #include "upb/base/descriptor_constants.h"
 #include "upb/mini_table/enum.h"
 #include "upb/mini_table/field.h"
 #include "upb/mini_table/internal/field.h"
 #include "upb/mini_table/message.h"
 #include "upb/reflection/def.hpp"
 #include "upb/wire/types.h"
 #include "upb_generator/common.h"
 #include "upb_generator/file_layout.h"

 // Must be last.
 #include "upb/port/def.inc"
 #include "upb_generator/plugin.h"

 namespace upb {
 namespace generator {
 namespace {

 // Returns fields in order of "hotness", eg. how frequently they appear in
 // serialized payloads. Ideally this will use a profile. When we don't have
 // that, we assume that fields with smaller numbers are used more frequently.
 inline std::vector<upb::FieldDefPtr> FieldHotnessOrder(
     upb::MessageDefPtr message) {
   std::vector<upb::FieldDefPtr> fields;
   size_t field_count = message.field_count();
   fields.reserve(field_count);
   for (size_t i = 0; i < field_count; i++) {
     fields.push_back(message.field(i));
   }
   std::sort(fields.begin(), fields.end(),
             [](upb::FieldDefPtr a, upb::FieldDefPtr b) {
               return std::make_pair(!a.is_required(), a.number()) <
                      std::make_pair(!b.is_required(), b.number());
             });
   return fields;
 }

 std::string ExtensionIdentBase(upb::FieldDefPtr ext) {
   UPB_ASSERT(ext.is_extension());
   std::string ext_scope;
   if (ext.extension_scope()) {
     return MessageName(ext.extension_scope());
   } else {
     return ToCIdent(ext.file().package());
   }
 }

 std::string ExtensionLayout(upb::FieldDefPtr ext) {
   return absl::StrCat(ExtensionIdentBase(ext), "_", ext.name(), "_ext");
 }

 std::string MessagePtrName(upb::MessageDefPtr message) {
   return MessageInitName(message) + "_ptr";
 }

 const char* kEnumsInit = "enums_layout";
 const char* kExtensionsInit = "extensions_layout";
 const char* kMessagesInit = "messages_layout";

 typedef std::pair<std::string, uint64_t> TableEntry;

 uint32_t GetWireTypeForField(upb::FieldDefPtr field) {
   if (field.packed()) return kUpb_WireType_Delimited;
   switch (field.type()) {
     case kUpb_FieldType_Double:
     case kUpb_FieldType_Fixed64:
     case kUpb_FieldType_SFixed64:
       return kUpb_WireType_64Bit;
     case kUpb_FieldType_Float:
     case kUpb_FieldType_Fixed32:
     case kUpb_FieldType_SFixed32:
       return kUpb_WireType_32Bit;
     case kUpb_FieldType_Int64:
     case kUpb_FieldType_UInt64:
     case kUpb_FieldType_Int32:
     case kUpb_FieldType_Bool:
     case kUpb_FieldType_UInt32:
     case kUpb_FieldType_Enum:
     case kUpb_FieldType_SInt32:
     case kUpb_FieldType_SInt64:
       return kUpb_WireType_Varint;
     case kUpb_FieldType_Group:
       return kUpb_WireType_StartGroup;
     case kUpb_FieldType_Message:
     case kUpb_FieldType_String:
     case kUpb_FieldType_Bytes:
       return kUpb_WireType_Delimited;
   }
   UPB_UNREACHABLE();
 }

 uint32_t MakeTag(uint32_t field_number, uint32_t wire_type) {
   return field_number << 3 | wire_type;
 }

 size_t WriteVarint32ToArray(uint64_t val, char* buf) {
   size_t i = 0;
   do {
     uint8_t byte = val & 0x7fU;
     val >>= 7;
     if (val) byte |= 0x80U;
     buf[i++] = byte;
   } while (val);
   return i;
 }

 uint64_t GetEncodedTag(upb::FieldDefPtr field) {
   uint32_t wire_type = GetWireTypeForField(field);
   uint32_t unencoded_tag = MakeTag(field.number(), wire_type);
   char tag_bytes[10] = {0};
   WriteVarint32ToArray(unencoded_tag, tag_bytes);
   uint64_t encoded_tag = 0;
   memcpy(&encoded_tag, tag_bytes, sizeof(encoded_tag));
   // TODO: byte-swap for big endian.
   return encoded_tag;
 }

 int GetTableSlot(upb::FieldDefPtr field) {
   uint64_t tag = GetEncodedTag(field);
   if (tag > 0x7fff) {
     // Tag must fit within a two-byte varint.
     return -1;
   }
   return (tag & 0xf8) >> 3;
 }

 bool TryFillTableEntry(const DefPoolPair& pools, upb::FieldDefPtr field,
                        TableEntry& ent) {
   const upb_MiniTable* mt = pools.GetMiniTable64(field.containing_type());
   const upb_MiniTableField* mt_f =
       upb_MiniTable_FindFieldByNumber(mt, field.number());
   std::string type = "";
   std::string cardinality = "";
   switch (upb_MiniTableField_Type(mt_f)) {
     case kUpb_FieldType_Bool:
       type = "b1";
       break;
     case kUpb_FieldType_Enum:
       if (upb_MiniTableField_IsClosedEnum(mt_f)) {
         // We don't have the means to test proto2 enum fields for valid values.
         return false;
       }
       [[fallthrough]];
     case kUpb_FieldType_Int32:
     case kUpb_FieldType_UInt32:
       type = "v4";
       break;
     case kUpb_FieldType_Int64:
     case kUpb_FieldType_UInt64:
       type = "v8";
       break;
     case kUpb_FieldType_Fixed32:
     case kUpb_FieldType_SFixed32:
     case kUpb_FieldType_Float:
       type = "f4";
       break;
     case kUpb_FieldType_Fixed64:
     case kUpb_FieldType_SFixed64:
     case kUpb_FieldType_Double:
       type = "f8";
       break;
     case kUpb_FieldType_SInt32:
       type = "z4";
       break;
     case kUpb_FieldType_SInt64:
       type = "z8";
       break;
     case kUpb_FieldType_String:
       type = "s";
       break;
     case kUpb_FieldType_Bytes:
       type = "b";
       break;
     case kUpb_FieldType_Message:
       type = "m";
       break;
     default:
       return false;  // Not supported yet.
   }

   if (upb_MiniTableField_IsArray(mt_f)) {
     cardinality = upb_MiniTableField_IsPacked(mt_f) ? "p" : "r";
   } else if (upb_MiniTableField_IsScalar(mt_f)) {
     cardinality = upb_MiniTableField_IsInOneof(mt_f) ? "o" : "s";
   } else {
     return false;  // Not supported yet (ever?).
   }

   uint64_t expected_tag = GetEncodedTag(field);

   // Data is:
   //
   //                  48                32                16                 0
   // |--------|--------|--------|--------|--------|--------|--------|--------|
   // |   offset (16)   |case offset (16) |presence| submsg |  exp. tag (16)  |
   // |--------|--------|--------|--------|--------|--------|--------|--------|
   //
   // - |presence| is either hasbit index or field number for oneofs.

   uint64_t data =
       static_cast<uint64_t>(mt_f->UPB_PRIVATE(offset)) << 48 | expected_tag;

   if (field.IsSequence()) {
     // No hasbit/oneof-related fields.
   }
   if (field.real_containing_oneof()) {
     uint64_t case_offset = ~mt_f->presence;
     if (case_offset > 0xffff || field.number() > 0xff) return false;
     data |= field.number() << 24;
     data |= case_offset << 32;
   } else {
     uint64_t hasbit_index = 63;  // No hasbit (set a high, unused bit).
     if (mt_f->presence) {
       hasbit_index = mt_f->presence;
       if (hasbit_index > 31) return false;
     }
     data |= hasbit_index << 24;
   }

   if (field.ctype() == kUpb_CType_Message) {
     uint64_t idx = mt_f->UPB_PRIVATE(submsg_index);
     if (idx > 255) return false;
     data |= idx << 16;

     std::string size_ceil = "max";
     size_t size = SIZE_MAX;
     if (field.message_type().file() == field.file()) {
       // We can only be guaranteed the size of the sub-message if it is in the
       // same file as us.  We could relax this to increase the speed of
       // cross-file sub-message parsing if we are comfortable requiring that
       // users compile all messages at the same time.
       const upb_MiniTable* sub_mt = pools.GetMiniTable64(field.message_type());
       size = sub_mt->UPB_PRIVATE(size) + 8;
     }
     std::vector<size_t> breaks = {64, 128, 192, 256};
     for (auto brk : breaks) {
       if (size <= brk) {
         size_ceil = std::to_string(brk);
         break;
       }
     }
     ent.first = absl::Substitute("upb_p$0$1_$2bt_max$3b", cardinality, type,
                                  expected_tag > 0xff ? "2" : "1", size_ceil);

   } else {
     ent.first = absl::Substitute("upb_p$0$1_$2bt", cardinality, type,
                                  expected_tag > 0xff ? "2" : "1");
   }
   ent.second = data;
   return true;
 }

 std::vector<TableEntry> FastDecodeTable(upb::MessageDefPtr message,
                                         const DefPoolPair& pools) {
   std::vector<TableEntry> table;
   for (const auto field : FieldHotnessOrder(message)) {
     TableEntry ent;
     int slot = GetTableSlot(field);
     // std::cerr << "table slot: " << field->number() << ": " << slot << "\n";
     if (slot < 0) {
       // Tag can't fit in the table.
       continue;
     }
     if (!TryFillTableEntry(pools, field, ent)) {
       // Unsupported field type or offset, hasbit index, etc. doesn't fit.
       continue;
     }
     while ((size_t)slot >= table.size()) {
       size_t size = std::max(static_cast<size_t>(1), table.size() * 2);
       table.resize(size, TableEntry{"_upb_FastDecoder_DecodeGeneric", 0});
     }
     if (table[slot].first != "_upb_FastDecoder_DecodeGeneric") {
       // A hotter field already filled this slot.
       continue;
     }
     table[slot] = ent;
   }
   return table;
 }

 std::string ArchDependentSize(int64_t size32, int64_t size64) {
   if (size32 == size64) return absl::StrCat(size32);
   return absl::Substitute("UPB_SIZE($0, $1)", size32, size64);
 }

 std::string FieldInitializer(const DefPoolPair& pools, upb::FieldDefPtr field) {
   return upb::generator::FieldInitializer(field, pools.GetField64(field),
                                           pools.GetField32(field));
 }

 // Writes a single field into a .upb.c source file.
 void WriteMessageField(upb::FieldDefPtr field,
                        const upb_MiniTableField* field64,
                        const upb_MiniTableField* field32, Output& output) {
   output("  $0,\n", upb::generator::FieldInitializer(field, field64, field32));
 }

 std::string GetSub(upb::FieldDefPtr field, bool is_extension) {
   if (auto message_def = field.message_type()) {
     return absl::Substitute("{.UPB_PRIVATE(submsg) = &$0}",
                             is_extension ? MessageInitName(message_def)
                                          : MessagePtrName(message_def));
   }

   if (auto enum_def = field.enum_subdef()) {
     if (enum_def.is_closed()) {
       return absl::Substitute("{.UPB_PRIVATE(subenum) = &$0}",
                               EnumInit(enum_def));
     }
   }

   return std::string("{.UPB_PRIVATE(submsg) = NULL}");
 }

 bool IsCrossFile(upb::FieldDefPtr field) {
   return field.message_type() != field.containing_type();
 }

 // Writes a single message into a .upb.c source file.
 void WriteMessage(upb::MessageDefPtr message, const DefPoolPair& pools,
                   const MiniTableOptions& options, Output& output) {
   std::string msg_name = ToCIdent(message.full_name());
   std::string fields_array_ref = "NULL";
   std::string submsgs_array_ref = "NULL";
   std::string subenums_array_ref = "NULL";
   const upb_MiniTable* mt_32 = pools.GetMiniTable32(message);
   const upb_MiniTable* mt_64 = pools.GetMiniTable64(message);
   std::map<int, std::string> subs;
   absl::flat_hash_set<const upb_MiniTable*> seen;

   // Construct map of sub messages by field number.
   for (int i = 0; i < mt_64->UPB_PRIVATE(field_count); i++) {
     const upb_MiniTableField* f = &mt_64->UPB_PRIVATE(fields)[i];
     uint32_t index = f->UPB_PRIVATE(submsg_index);
     if (index != kUpb_NoSub) {
       const int f_number = upb_MiniTableField_Number(f);
       upb::FieldDefPtr field = message.FindFieldByNumber(f_number);
       auto pair = subs.emplace(index, GetSub(field, false));
       ABSL_CHECK(pair.second);
       if (options.one_output_per_message && field.IsSubMessage() &&
           IsCrossFile(field) && !upb_MiniTableField_IsMap(f)) {
         if (seen.insert(pools.GetMiniTable64(field.message_type())).second) {
           output(
               "__attribute__((weak)) const upb_MiniTable* $0 ="
               " &UPB_PRIVATE(_kUpb_MiniTable_StaticallyTreeShaken);\n",
               MessagePtrName(field.message_type()));
         }
       }
     }
   }
   // Write upb_MiniTableSubInternal table for sub messages referenced from
   // fields.
   if (!subs.empty()) {
     std::string submsgs_array_name = msg_name + "_submsgs";
     submsgs_array_ref = "&" + submsgs_array_name + "[0]";
     output("static const upb_MiniTableSubInternal $0[$1] = {\n",
            submsgs_array_name, subs.size());

     int i = 0;
     for (const auto& pair : subs) {
       ABSL_CHECK(pair.first == i++);
       output("  $0,\n", pair.second);
     }

     output("};\n\n");
   }

   // Write upb_MiniTableField table.
   if (mt_64->UPB_PRIVATE(field_count) > 0) {
     std::string fields_array_name = msg_name + "__fields";
     fields_array_ref = "&" + fields_array_name + "[0]";
     output("static const upb_MiniTableField $0[$1] = {\n", fields_array_name,
            mt_64->UPB_PRIVATE(field_count));
     for (int i = 0; i < mt_64->UPB_PRIVATE(field_count); i++) {
       WriteMessageField(message.FindFieldByNumber(
                             mt_64->UPB_PRIVATE(fields)[i].UPB_PRIVATE(number)),
                         &mt_64->UPB_PRIVATE(fields)[i],
                         &mt_32->UPB_PRIVATE(fields)[i], output);
     }
     output("};\n\n");
   }

   std::vector<TableEntry> table;
   uint8_t table_mask = ~0;

   table = FastDecodeTable(message, pools);

   if (table.size() > 1) {
     UPB_ASSERT((table.size() & (table.size() - 1)) == 0);
     table_mask = (table.size() - 1) << 3;
   }

   std::string msgext = "kUpb_ExtMode_NonExtendable";

   if (message.extension_range_count()) {
     if (UPB_DESC(MessageOptions_message_set_wire_format)(message.options())) {
       msgext = "kUpb_ExtMode_IsMessageSet";
     } else {
       msgext = "kUpb_ExtMode_Extendable";
     }
   }

   output("const upb_MiniTable $0 = {\n", MessageInitName(message));
   output("  $0,\n", submsgs_array_ref);
   output("  $0,\n", fields_array_ref);
   output("  $0, $1, $2, $3, UPB_FASTTABLE_MASK($4), $5,\n",
          ArchDependentSize(mt_32->UPB_PRIVATE(size), mt_64->UPB_PRIVATE(size)),
          mt_64->UPB_PRIVATE(field_count), msgext,
          mt_64->UPB_PRIVATE(dense_below), table_mask,
          mt_64->UPB_PRIVATE(required_count));
   output("#ifdef UPB_TRACING_ENABLED\n");
   output("  \"$0\",\n", message.full_name());
   output("#endif\n");
   if (!table.empty()) {
     output("  UPB_FASTTABLE_INIT({\n");
     for (const auto& ent : table) {
       output("    {0x$1, &$0},\n", ent.first,
              absl::StrCat(absl::Hex(ent.second, absl::kZeroPad16)));
     }
     output("  })\n");
   }
   output("};\n\n");
   output("const upb_MiniTable* $0 = &$1;\n", MessagePtrName(message),
          MessageInitName(message));
 }

 void WriteEnum(upb::EnumDefPtr e, Output& output) {
   std::string values_init = "{\n";
   const upb_MiniTableEnum* mt = e.mini_table();
   uint32_t value_count =
       (mt->UPB_PRIVATE(mask_limit) / 32) + mt->UPB_PRIVATE(value_count);
   for (uint32_t i = 0; i < value_count; i++) {
     absl::StrAppend(&values_init, "                0x",
                     absl::Hex(mt->UPB_PRIVATE(data)[i]), ",\n");
   }
   values_init += "    }";

   output(
       R"cc(
         const upb_MiniTableEnum $0 = {
             $1,
             $2,
             $3,
         };
       )cc",
       EnumInit(e), mt->UPB_PRIVATE(mask_limit), mt->UPB_PRIVATE(value_count),
       values_init);
   output("\n");
 }

 void WriteExtension(const DefPoolPair& pools, upb::FieldDefPtr ext,
                     Output& output) {
   output("UPB_LINKARR_APPEND(upb_AllExts)\n");
   output("const upb_MiniTableExtension $0 = {\n  ", ExtensionLayout(ext));
   output("$0,\n", FieldInitializer(pools, ext));
   output("  &$0,\n", MessageInitName(ext.containing_type()));
   output("  $0,\n", GetSub(ext, true));
   output("\n};\n");
 }

 }  // namespace

 void WriteMiniTableHeader(const DefPoolPair& pools, upb::FileDefPtr file,
                           Output& output) {
   EmitFileWarning(file.name(), output);
   output(
       "#ifndef $0_UPB_MINITABLE_H_\n"
       "#define $0_UPB_MINITABLE_H_\n\n"
       "#include \"upb/generated_code_support.h\"\n",
       ToPreproc(file.name()));

   for (int i = 0; i < file.public_dependency_count(); i++) {
     if (i == 0) {
       output("/* Public Imports. */\n");
     }
     output("#include \"$0\"\n",
            MiniTableHeaderFilename(file.public_dependency(i)));
     if (i == file.public_dependency_count() - 1) {
       output("\n");
     }
   }

   output(
       "\n"
       "// Must be last.\n"
       "#include \"upb/port/def.inc\"\n"
       "\n"
       "#ifdef __cplusplus\n"
       "extern \"C\" {\n"
       "#endif\n"
       "\n");

   const std::vector<upb::MessageDefPtr> this_file_messages =
       SortedMessages(file);
   const std::vector<upb::FieldDefPtr> this_file_exts = SortedExtensions(file);

   for (auto message : this_file_messages) {
     output("extern const upb_MiniTable $0;\n", MessageInitName(message));
     output("extern const upb_MiniTable* $0;\n", MessagePtrName(message));
   }
   for (auto ext : this_file_exts) {
     output("extern const upb_MiniTableExtension $0;\n", ExtensionLayout(ext));
   }

   output("\n");

   std::vector<upb::EnumDefPtr> this_file_enums =
       SortedEnums(file, kClosedEnums);

   for (const auto enumdesc : this_file_enums) {
     output("extern const upb_MiniTableEnum $0;\n", EnumInit(enumdesc));
   }

   output("extern const upb_MiniTableFile $0;\n\n", FileLayoutName(file));

   output(
       "#ifdef __cplusplus\n"
       "}  /* extern \"C\" */\n"
       "#endif\n"
       "\n"
       "#include \"upb/port/undef.inc\"\n"
       "\n"
       "#endif  /* $0_UPB_MINITABLE_H_ */\n",
       ToPreproc(file.name()));
 }

 void WriteMiniTableSourceIncludes(upb::FileDefPtr file, Output& output) {
   EmitFileWarning(file.name(), output);

   output(
       "#include <stddef.h>\n"
       "#include \"upb/generated_code_support.h\"\n"
       "#include \"$0\"\n",
       MiniTableHeaderFilename(file));

   for (int i = 0; i < file.dependency_count(); i++) {
     output("#include \"$0\"\n", MiniTableHeaderFilename(file.dependency(i)));
   }

   output(
       "\n"
       "// Must be last.\n"
       "#include \"upb/port/def.inc\"\n"
       "\n");

   output(
       "extern const struct upb_MiniTable "
       "UPB_PRIVATE(_kUpb_MiniTable_StaticallyTreeShaken);\n");
 }

 void WriteMiniTableSource(const DefPoolPair& pools, upb::FileDefPtr file,
                           const MiniTableOptions& options, Output& output) {
   WriteMiniTableSourceIncludes(file, output);

   std::vector<upb::MessageDefPtr> messages = SortedMessages(file);
   std::vector<upb::FieldDefPtr> extensions = SortedExtensions(file);
   std::vector<upb::EnumDefPtr> enums = SortedEnums(file, kClosedEnums);

   if (options.one_output_per_message) {
     for (auto message : messages) {
       output("extern const upb_MiniTable* $0;\n", MessagePtrName(message));
     }
     for (const auto e : enums) {
       output("extern const upb_MiniTableEnum $0;\n", EnumInit(e));
     }
     for (const auto ext : extensions) {
       output("extern const upb_MiniTableExtension $0;\n", ExtensionLayout(ext));
     }
   } else {
     for (auto message : messages) {
       WriteMessage(message, pools, options, output);
     }
     for (const auto e : enums) {
       WriteEnum(e, output);
     }
     for (const auto ext : extensions) {
       WriteExtension(pools, ext, output);
     }
   }

   // Messages.
   if (!messages.empty()) {
     output("static const upb_MiniTable *$0[$1] = {\n", kMessagesInit,
            messages.size());
     for (auto message : messages) {
       output("  &$0,\n", MessageInitName(message));
     }
     output("};\n");
     output("\n");
   }

   // Enums.
   if (!enums.empty()) {
     output("static const upb_MiniTableEnum *$0[$1] = {\n", kEnumsInit,
            enums.size());
     for (const auto e : enums) {
       output("  &$0,\n", EnumInit(e));
     }
     output("};\n");
     output("\n");
   }

   if (!extensions.empty()) {
     // Extensions.
     output(
         "\n"
         "static const upb_MiniTableExtension *$0[$1] = {\n",
         kExtensionsInit, extensions.size());

     for (auto ext : extensions) {
       output("  &$0,\n", ExtensionLayout(ext));
     }

     output(
         "};\n"
         "\n");
   }

   output("const upb_MiniTableFile $0 = {\n", FileLayoutName(file));
   output("  $0,\n", messages.empty() ? "NULL" : kMessagesInit);
   output("  $0,\n", enums.empty() ? "NULL" : kEnumsInit);
   output("  $0,\n", extensions.empty() ? "NULL" : kExtensionsInit);
   output("  $0,\n", messages.size());
   output("  $0,\n", enums.size());
   output("  $0,\n", extensions.size());
   output("};\n\n");

   output("#include \"upb/port/undef.inc\"\n");
   output("\n");
 }

 std::string MultipleSourceFilename(upb::FileDefPtr file,
                                    absl::string_view full_name, int* i) {
   *i += 1;
   return absl::StrCat(StripExtension(file.name()), ".upb_weak_minitables/",
                       *i, ".upb.c");
 }

 void WriteMiniTableMultipleSources(const DefPoolPair& pools,
                                    upb::FileDefPtr file,
                                    const MiniTableOptions& options,
                                    Plugin* plugin) {
   std::vector<upb::MessageDefPtr> messages = SortedMessages(file);
   std::vector<upb::FieldDefPtr> extensions = SortedExtensions(file);
   std::vector<upb::EnumDefPtr> enums = SortedEnums(file, kClosedEnums);
   int i = 0;

   for (auto message : messages) {
     Output output;
     WriteMiniTableSourceIncludes(file, output);
     WriteMessage(message, pools, options, output);
     plugin->AddOutputFile(MultipleSourceFilename(file, message.full_name(), &i),
                           output.output());
   }
   for (const auto e : enums) {
     Output output;
     WriteMiniTableSourceIncludes(file, output);
     WriteEnum(e, output);
     plugin->AddOutputFile(MultipleSourceFilename(file, e.full_name(), &i),
                           output.output());
   }
   for (const auto ext : extensions) {
     Output output;
     WriteMiniTableSourceIncludes(file, output);
     WriteExtension(pools, ext, output);
     plugin->AddOutputFile(MultipleSourceFilename(file, ext.full_name(), &i),
                           output.output());
   }
 }

 }  // namespace generator
 }  // namespace upb
	// 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

	#include "upb_generator/protoc-gen-upb_minitable.h"

	#include <string.h>

	#include <algorithm>
	#include <cstddef>
	#include <cstdint>
	#include <cstdio>
	#include <cstdlib>
	#include <map>
	#include <string>
	#include <utility>
	#include <vector>

	#include "absl/container/flat_hash_set.h"
	#include "absl/log/absl_check.h"
	#include "absl/strings/str_cat.h"
	#include "absl/strings/string_view.h"
	#include "absl/strings/substitute.h"
	#include "upb/base/descriptor_constants.h"
	#include "upb/mini_table/enum.h"
	#include "upb/mini_table/field.h"
	#include "upb/mini_table/internal/field.h"
	#include "upb/mini_table/message.h"
	#include "upb/reflection/def.hpp"
	#include "upb/wire/types.h"
	#include "upb_generator/common.h"
	#include "upb_generator/file_layout.h"

	// Must be last.
	#include "upb/port/def.inc"
	#include "upb_generator/plugin.h"

	namespace upb {
	namespace generator {
	namespace {

	// Returns fields in order of "hotness", eg. how frequently they appear in
	// serialized payloads. Ideally this will use a profile. When we don't have
	// that, we assume that fields with smaller numbers are used more frequently.
	inline std::vector<upb::FieldDefPtr> FieldHotnessOrder(
	upb::MessageDefPtr message) {
	std::vector<upb::FieldDefPtr> fields;
	size_t field_count = message.field_count();
	fields.reserve(field_count);
	for (size_t i = 0; i < field_count; i++) {
	fields.push_back(message.field(i));
	}
	std::sort(fields.begin(), fields.end(),
	[](upb::FieldDefPtr a, upb::FieldDefPtr b) {
	return std::make_pair(!a.is_required(), a.number()) <
	std::make_pair(!b.is_required(), b.number());
	});
	return fields;
	}

	std::string ExtensionIdentBase(upb::FieldDefPtr ext) {
	UPB_ASSERT(ext.is_extension());
	std::string ext_scope;
	if (ext.extension_scope()) {
	return MessageName(ext.extension_scope());
	} else {
	return ToCIdent(ext.file().package());
	}
	}

	std::string ExtensionLayout(upb::FieldDefPtr ext) {
	return absl::StrCat(ExtensionIdentBase(ext), "_", ext.name(), "_ext");
	}

	std::string MessagePtrName(upb::MessageDefPtr message) {
	return MessageInitName(message) + "_ptr";
	}

	const char* kEnumsInit = "enums_layout";
	const char* kExtensionsInit = "extensions_layout";
	const char* kMessagesInit = "messages_layout";

	typedef std::pair<std::string, uint64_t> TableEntry;

	uint32_t GetWireTypeForField(upb::FieldDefPtr field) {
	if (field.packed()) return kUpb_WireType_Delimited;
	switch (field.type()) {
	case kUpb_FieldType_Double:
	case kUpb_FieldType_Fixed64:
	case kUpb_FieldType_SFixed64:
	return kUpb_WireType_64Bit;
	case kUpb_FieldType_Float:
	case kUpb_FieldType_Fixed32:
	case kUpb_FieldType_SFixed32:
	return kUpb_WireType_32Bit;
	case kUpb_FieldType_Int64:
	case kUpb_FieldType_UInt64:
	case kUpb_FieldType_Int32:
	case kUpb_FieldType_Bool:
	case kUpb_FieldType_UInt32:
	case kUpb_FieldType_Enum:
	case kUpb_FieldType_SInt32:
	case kUpb_FieldType_SInt64:
	return kUpb_WireType_Varint;
	case kUpb_FieldType_Group:
	return kUpb_WireType_StartGroup;
	case kUpb_FieldType_Message:
	case kUpb_FieldType_String:
	case kUpb_FieldType_Bytes:
	return kUpb_WireType_Delimited;
	}
	UPB_UNREACHABLE();
	}

	uint32_t MakeTag(uint32_t field_number, uint32_t wire_type) {
	return field_number << 3 \| wire_type;
	}

	size_t WriteVarint32ToArray(uint64_t val, char* buf) {
	size_t i = 0;
	do {
	uint8_t byte = val & 0x7fU;
	val >>= 7;
	if (val) byte \|= 0x80U;
	buf[i++] = byte;
	} while (val);
	return i;
	}

	uint64_t GetEncodedTag(upb::FieldDefPtr field) {
	uint32_t wire_type = GetWireTypeForField(field);
	uint32_t unencoded_tag = MakeTag(field.number(), wire_type);
	char tag_bytes[10] = {0};
	WriteVarint32ToArray(unencoded_tag, tag_bytes);
	uint64_t encoded_tag = 0;
	memcpy(&encoded_tag, tag_bytes, sizeof(encoded_tag));
	// TODO: byte-swap for big endian.
	return encoded_tag;
	}

	int GetTableSlot(upb::FieldDefPtr field) {
	uint64_t tag = GetEncodedTag(field);
	if (tag > 0x7fff) {
	// Tag must fit within a two-byte varint.
	return -1;
	}
	return (tag & 0xf8) >> 3;
	}

	bool TryFillTableEntry(const DefPoolPair& pools, upb::FieldDefPtr field,
	TableEntry& ent) {
	const upb_MiniTable* mt = pools.GetMiniTable64(field.containing_type());
	const upb_MiniTableField* mt_f =
	upb_MiniTable_FindFieldByNumber(mt, field.number());
	std::string type = "";
	std::string cardinality = "";
	switch (upb_MiniTableField_Type(mt_f)) {
	case kUpb_FieldType_Bool:
	type = "b1";
	break;
	case kUpb_FieldType_Enum:
	if (upb_MiniTableField_IsClosedEnum(mt_f)) {
	// We don't have the means to test proto2 enum fields for valid values.
	return false;
	}
	[[fallthrough]];
	case kUpb_FieldType_Int32:
	case kUpb_FieldType_UInt32:
	type = "v4";
	break;
	case kUpb_FieldType_Int64:
	case kUpb_FieldType_UInt64:
	type = "v8";
	break;
	case kUpb_FieldType_Fixed32:
	case kUpb_FieldType_SFixed32:
	case kUpb_FieldType_Float:
	type = "f4";
	break;
	case kUpb_FieldType_Fixed64:
	case kUpb_FieldType_SFixed64:
	case kUpb_FieldType_Double:
	type = "f8";
	break;
	case kUpb_FieldType_SInt32:
	type = "z4";
	break;
	case kUpb_FieldType_SInt64:
	type = "z8";
	break;
	case kUpb_FieldType_String:
	type = "s";
	break;
	case kUpb_FieldType_Bytes:
	type = "b";
	break;
	case kUpb_FieldType_Message:
	type = "m";
	break;
	default:
	return false; // Not supported yet.
	}

	if (upb_MiniTableField_IsArray(mt_f)) {
	cardinality = upb_MiniTableField_IsPacked(mt_f) ? "p" : "r";
	} else if (upb_MiniTableField_IsScalar(mt_f)) {
	cardinality = upb_MiniTableField_IsInOneof(mt_f) ? "o" : "s";
	} else {
	return false; // Not supported yet (ever?).
	}

	uint64_t expected_tag = GetEncodedTag(field);

	// Data is:
	//
	// 48 32 16 0
	// \|--------\|--------\|--------\|--------\|--------\|--------\|--------\|--------\|
	// \| offset (16) \|case offset (16) \|presence\| submsg \| exp. tag (16) \|
	// \|--------\|--------\|--------\|--------\|--------\|--------\|--------\|--------\|
	//
	// - \|presence\| is either hasbit index or field number for oneofs.

	uint64_t data =
	static_cast<uint64_t>(mt_f->UPB_PRIVATE(offset)) << 48 \| expected_tag;

	if (field.IsSequence()) {
	// No hasbit/oneof-related fields.
	}
	if (field.real_containing_oneof()) {
	uint64_t case_offset = ~mt_f->presence;
	if (case_offset > 0xffff \|\| field.number() > 0xff) return false;
	data \|= field.number() << 24;
	data \|= case_offset << 32;
	} else {
	uint64_t hasbit_index = 63; // No hasbit (set a high, unused bit).
	if (mt_f->presence) {
	hasbit_index = mt_f->presence;
	if (hasbit_index > 31) return false;
	}
	data \|= hasbit_index << 24;
	}

	if (field.ctype() == kUpb_CType_Message) {
	uint64_t idx = mt_f->UPB_PRIVATE(submsg_index);
	if (idx > 255) return false;
	data \|= idx << 16;

	std::string size_ceil = "max";
	size_t size = SIZE_MAX;
	if (field.message_type().file() == field.file()) {
	// We can only be guaranteed the size of the sub-message if it is in the
	// same file as us. We could relax this to increase the speed of
	// cross-file sub-message parsing if we are comfortable requiring that
	// users compile all messages at the same time.
	const upb_MiniTable* sub_mt = pools.GetMiniTable64(field.message_type());
	size = sub_mt->UPB_PRIVATE(size) + 8;
	}
	std::vector<size_t> breaks = {64, 128, 192, 256};
	for (auto brk : breaks) {
	if (size <= brk) {
	size_ceil = std::to_string(brk);
	break;
	}
	}
	ent.first = absl::Substitute("upb_p$0$1_$2bt_max$3b", cardinality, type,
	expected_tag > 0xff ? "2" : "1", size_ceil);

	} else {
	ent.first = absl::Substitute("upb_p$0$1_$2bt", cardinality, type,
	expected_tag > 0xff ? "2" : "1");
	}
	ent.second = data;
	return true;
	}

	std::vector<TableEntry> FastDecodeTable(upb::MessageDefPtr message,
	const DefPoolPair& pools) {
	std::vector<TableEntry> table;
	for (const auto field : FieldHotnessOrder(message)) {
	TableEntry ent;
	int slot = GetTableSlot(field);
	// std::cerr << "table slot: " << field->number() << ": " << slot << "\n";
	if (slot < 0) {
	// Tag can't fit in the table.
	continue;
	}
	if (!TryFillTableEntry(pools, field, ent)) {
	// Unsupported field type or offset, hasbit index, etc. doesn't fit.
	continue;
	}
	while ((size_t)slot >= table.size()) {
	size_t size = std::max(static_cast<size_t>(1), table.size() * 2);
	table.resize(size, TableEntry{"_upb_FastDecoder_DecodeGeneric", 0});
	}
	if (table[slot].first != "_upb_FastDecoder_DecodeGeneric") {
	// A hotter field already filled this slot.
	continue;
	}
	table[slot] = ent;
	}
	return table;
	}

	std::string ArchDependentSize(int64_t size32, int64_t size64) {
	if (size32 == size64) return absl::StrCat(size32);
	return absl::Substitute("UPB_SIZE($0, $1)", size32, size64);
	}

	std::string FieldInitializer(const DefPoolPair& pools, upb::FieldDefPtr field) {
	return upb::generator::FieldInitializer(field, pools.GetField64(field),
	pools.GetField32(field));
	}

	// Writes a single field into a .upb.c source file.
	void WriteMessageField(upb::FieldDefPtr field,
	const upb_MiniTableField* field64,
	const upb_MiniTableField* field32, Output& output) {
	output(" $0,\n", upb::generator::FieldInitializer(field, field64, field32));
	}

	std::string GetSub(upb::FieldDefPtr field, bool is_extension) {
	if (auto message_def = field.message_type()) {
	return absl::Substitute("{.UPB_PRIVATE(submsg) = &$0}",
	is_extension ? MessageInitName(message_def)
	: MessagePtrName(message_def));
	}

	if (auto enum_def = field.enum_subdef()) {
	if (enum_def.is_closed()) {
	return absl::Substitute("{.UPB_PRIVATE(subenum) = &$0}",
	EnumInit(enum_def));
	}
	}

	return std::string("{.UPB_PRIVATE(submsg) = NULL}");
	}

	bool IsCrossFile(upb::FieldDefPtr field) {
	return field.message_type() != field.containing_type();
	}

	// Writes a single message into a .upb.c source file.
	void WriteMessage(upb::MessageDefPtr message, const DefPoolPair& pools,
	const MiniTableOptions& options, Output& output) {
	std::string msg_name = ToCIdent(message.full_name());
	std::string fields_array_ref = "NULL";
	std::string submsgs_array_ref = "NULL";
	std::string subenums_array_ref = "NULL";
	const upb_MiniTable* mt_32 = pools.GetMiniTable32(message);
	const upb_MiniTable* mt_64 = pools.GetMiniTable64(message);
	std::map<int, std::string> subs;
	absl::flat_hash_set<const upb_MiniTable*> seen;

	// Construct map of sub messages by field number.
	for (int i = 0; i < mt_64->UPB_PRIVATE(field_count); i++) {
	const upb_MiniTableField* f = &mt_64->UPB_PRIVATE(fields)[i];
	uint32_t index = f->UPB_PRIVATE(submsg_index);
	if (index != kUpb_NoSub) {
	const int f_number = upb_MiniTableField_Number(f);
	upb::FieldDefPtr field = message.FindFieldByNumber(f_number);
	auto pair = subs.emplace(index, GetSub(field, false));
	ABSL_CHECK(pair.second);
	if (options.one_output_per_message && field.IsSubMessage() &&
	IsCrossFile(field) && !upb_MiniTableField_IsMap(f)) {
	if (seen.insert(pools.GetMiniTable64(field.message_type())).second) {
	output(
	"__attribute__((weak)) const upb_MiniTable* $0 ="
	" &UPB_PRIVATE(_kUpb_MiniTable_StaticallyTreeShaken);\n",
	MessagePtrName(field.message_type()));
	}
	}
	}
	}
	// Write upb_MiniTableSubInternal table for sub messages referenced from
	// fields.
	if (!subs.empty()) {
	std::string submsgs_array_name = msg_name + "_submsgs";
	submsgs_array_ref = "&" + submsgs_array_name + "[0]";
	output("static const upb_MiniTableSubInternal $0[$1] = {\n",
	submsgs_array_name, subs.size());

	int i = 0;
	for (const auto& pair : subs) {
	ABSL_CHECK(pair.first == i++);
	output(" $0,\n", pair.second);
	}

	output("};\n\n");
	}

	// Write upb_MiniTableField table.
	if (mt_64->UPB_PRIVATE(field_count) > 0) {
	std::string fields_array_name = msg_name + "__fields";
	fields_array_ref = "&" + fields_array_name + "[0]";
	output("static const upb_MiniTableField $0[$1] = {\n", fields_array_name,
	mt_64->UPB_PRIVATE(field_count));
	for (int i = 0; i < mt_64->UPB_PRIVATE(field_count); i++) {
	WriteMessageField(message.FindFieldByNumber(
	mt_64->UPB_PRIVATE(fields)[i].UPB_PRIVATE(number)),
	&mt_64->UPB_PRIVATE(fields)[i],
	&mt_32->UPB_PRIVATE(fields)[i], output);
	}
	output("};\n\n");
	}

	std::vector<TableEntry> table;
	uint8_t table_mask = ~0;

	table = FastDecodeTable(message, pools);

	if (table.size() > 1) {
	UPB_ASSERT((table.size() & (table.size() - 1)) == 0);
	table_mask = (table.size() - 1) << 3;
	}

	std::string msgext = "kUpb_ExtMode_NonExtendable";

	if (message.extension_range_count()) {
	if (UPB_DESC(MessageOptions_message_set_wire_format)(message.options())) {
	msgext = "kUpb_ExtMode_IsMessageSet";
	} else {
	msgext = "kUpb_ExtMode_Extendable";
	}
	}

	output("const upb_MiniTable $0 = {\n", MessageInitName(message));
	output(" $0,\n", submsgs_array_ref);
	output(" $0,\n", fields_array_ref);
	output(" $0, $1, $2, $3, UPB_FASTTABLE_MASK($4), $5,\n",
	ArchDependentSize(mt_32->UPB_PRIVATE(size), mt_64->UPB_PRIVATE(size)),
	mt_64->UPB_PRIVATE(field_count), msgext,
	mt_64->UPB_PRIVATE(dense_below), table_mask,
	mt_64->UPB_PRIVATE(required_count));
	output("#ifdef UPB_TRACING_ENABLED\n");
	output(" \"$0\",\n", message.full_name());
	output("#endif\n");
	if (!table.empty()) {
	output(" UPB_FASTTABLE_INIT({\n");
	for (const auto& ent : table) {
	output(" {0x$1, &$0},\n", ent.first,
	absl::StrCat(absl::Hex(ent.second, absl::kZeroPad16)));
	}
	output(" })\n");
	}
	output("};\n\n");
	output("const upb_MiniTable* $0 = &$1;\n", MessagePtrName(message),
	MessageInitName(message));
	}

	void WriteEnum(upb::EnumDefPtr e, Output& output) {
	std::string values_init = "{\n";
	const upb_MiniTableEnum* mt = e.mini_table();
	uint32_t value_count =
	(mt->UPB_PRIVATE(mask_limit) / 32) + mt->UPB_PRIVATE(value_count);
	for (uint32_t i = 0; i < value_count; i++) {
	absl::StrAppend(&values_init, " 0x",
	absl::Hex(mt->UPB_PRIVATE(data)[i]), ",\n");
	}
	values_init += " }";

	output(
	R"cc(
	const upb_MiniTableEnum $0 = {
	$1,
	$2,
	$3,
	};
	)cc",
	EnumInit(e), mt->UPB_PRIVATE(mask_limit), mt->UPB_PRIVATE(value_count),
	values_init);
	output("\n");
	}

	void WriteExtension(const DefPoolPair& pools, upb::FieldDefPtr ext,
	Output& output) {
	output("UPB_LINKARR_APPEND(upb_AllExts)\n");
	output("const upb_MiniTableExtension $0 = {\n ", ExtensionLayout(ext));
	output("$0,\n", FieldInitializer(pools, ext));
	output(" &$0,\n", MessageInitName(ext.containing_type()));
	output(" $0,\n", GetSub(ext, true));
	output("\n};\n");
	}

	} // namespace

	void WriteMiniTableHeader(const DefPoolPair& pools, upb::FileDefPtr file,
	Output& output) {
	EmitFileWarning(file.name(), output);
	output(
	"#ifndef $0_UPB_MINITABLE_H_\n"
	"#define $0_UPB_MINITABLE_H_\n\n"
	"#include \"upb/generated_code_support.h\"\n",
	ToPreproc(file.name()));

	for (int i = 0; i < file.public_dependency_count(); i++) {
	if (i == 0) {
	output("/* Public Imports. */\n");
	}
	output("#include \"$0\"\n",
	MiniTableHeaderFilename(file.public_dependency(i)));
	if (i == file.public_dependency_count() - 1) {
	output("\n");
	}
	}

	output(
	"\n"
	"// Must be last.\n"
	"#include \"upb/port/def.inc\"\n"
	"\n"
	"#ifdef __cplusplus\n"
	"extern \"C\" {\n"
	"#endif\n"
	"\n");

	const std::vector<upb::MessageDefPtr> this_file_messages =
	SortedMessages(file);
	const std::vector<upb::FieldDefPtr> this_file_exts = SortedExtensions(file);

	for (auto message : this_file_messages) {
	output("extern const upb_MiniTable $0;\n", MessageInitName(message));
	output("extern const upb_MiniTable* $0;\n", MessagePtrName(message));
	}
	for (auto ext : this_file_exts) {
	output("extern const upb_MiniTableExtension $0;\n", ExtensionLayout(ext));
	}

	output("\n");

	std::vector<upb::EnumDefPtr> this_file_enums =
	SortedEnums(file, kClosedEnums);

	for (const auto enumdesc : this_file_enums) {
	output("extern const upb_MiniTableEnum $0;\n", EnumInit(enumdesc));
	}

	output("extern const upb_MiniTableFile $0;\n\n", FileLayoutName(file));

	output(
	"#ifdef __cplusplus\n"
	"} /* extern \"C\" */\n"
	"#endif\n"
	"\n"
	"#include \"upb/port/undef.inc\"\n"
	"\n"
	"#endif /* $0_UPB_MINITABLE_H_ */\n",
	ToPreproc(file.name()));
	}

	void WriteMiniTableSourceIncludes(upb::FileDefPtr file, Output& output) {
	EmitFileWarning(file.name(), output);

	output(
	"#include <stddef.h>\n"
	"#include \"upb/generated_code_support.h\"\n"
	"#include \"$0\"\n",
	MiniTableHeaderFilename(file));

	for (int i = 0; i < file.dependency_count(); i++) {
	output("#include \"$0\"\n", MiniTableHeaderFilename(file.dependency(i)));
	}

	output(
	"\n"
	"// Must be last.\n"
	"#include \"upb/port/def.inc\"\n"
	"\n");

	output(
	"extern const struct upb_MiniTable "
	"UPB_PRIVATE(_kUpb_MiniTable_StaticallyTreeShaken);\n");
	}

	void WriteMiniTableSource(const DefPoolPair& pools, upb::FileDefPtr file,
	const MiniTableOptions& options, Output& output) {
	WriteMiniTableSourceIncludes(file, output);

	std::vector<upb::MessageDefPtr> messages = SortedMessages(file);
	std::vector<upb::FieldDefPtr> extensions = SortedExtensions(file);
	std::vector<upb::EnumDefPtr> enums = SortedEnums(file, kClosedEnums);

	if (options.one_output_per_message) {
	for (auto message : messages) {
	output("extern const upb_MiniTable* $0;\n", MessagePtrName(message));
	}
	for (const auto e : enums) {
	output("extern const upb_MiniTableEnum $0;\n", EnumInit(e));
	}
	for (const auto ext : extensions) {
	output("extern const upb_MiniTableExtension $0;\n", ExtensionLayout(ext));
	}
	} else {
	for (auto message : messages) {
	WriteMessage(message, pools, options, output);
	}
	for (const auto e : enums) {
	WriteEnum(e, output);
	}
	for (const auto ext : extensions) {
	WriteExtension(pools, ext, output);
	}
	}

	// Messages.
	if (!messages.empty()) {
	output("static const upb_MiniTable *$0[$1] = {\n", kMessagesInit,
	messages.size());
	for (auto message : messages) {
	output(" &$0,\n", MessageInitName(message));
	}
	output("};\n");
	output("\n");
	}

	// Enums.
	if (!enums.empty()) {
	output("static const upb_MiniTableEnum *$0[$1] = {\n", kEnumsInit,
	enums.size());
	for (const auto e : enums) {
	output(" &$0,\n", EnumInit(e));
	}
	output("};\n");
	output("\n");
	}

	if (!extensions.empty()) {
	// Extensions.
	output(
	"\n"
	"static const upb_MiniTableExtension *$0[$1] = {\n",
	kExtensionsInit, extensions.size());

	for (auto ext : extensions) {
	output(" &$0,\n", ExtensionLayout(ext));
	}

	output(
	"};\n"
	"\n");
	}

	output("const upb_MiniTableFile $0 = {\n", FileLayoutName(file));
	output(" $0,\n", messages.empty() ? "NULL" : kMessagesInit);
	output(" $0,\n", enums.empty() ? "NULL" : kEnumsInit);
	output(" $0,\n", extensions.empty() ? "NULL" : kExtensionsInit);
	output(" $0,\n", messages.size());
	output(" $0,\n", enums.size());
	output(" $0,\n", extensions.size());
	output("};\n\n");

	output("#include \"upb/port/undef.inc\"\n");
	output("\n");
	}

	std::string MultipleSourceFilename(upb::FileDefPtr file,
	absl::string_view full_name, int* i) {
	*i += 1;
	return absl::StrCat(StripExtension(file.name()), ".upb_weak_minitables/",
	*i, ".upb.c");
	}

	void WriteMiniTableMultipleSources(const DefPoolPair& pools,
	upb::FileDefPtr file,
	const MiniTableOptions& options,
	Plugin* plugin) {
	std::vector<upb::MessageDefPtr> messages = SortedMessages(file);
	std::vector<upb::FieldDefPtr> extensions = SortedExtensions(file);
	std::vector<upb::EnumDefPtr> enums = SortedEnums(file, kClosedEnums);
	int i = 0;

	for (auto message : messages) {
	Output output;
	WriteMiniTableSourceIncludes(file, output);
	WriteMessage(message, pools, options, output);
	plugin->AddOutputFile(MultipleSourceFilename(file, message.full_name(), &i),
	output.output());
	}
	for (const auto e : enums) {
	Output output;
	WriteMiniTableSourceIncludes(file, output);
	WriteEnum(e, output);
	plugin->AddOutputFile(MultipleSourceFilename(file, e.full_name(), &i),
	output.output());
	}
	for (const auto ext : extensions) {
	Output output;
	WriteMiniTableSourceIncludes(file, output);
	WriteExtension(pools, ext, output);
	plugin->AddOutputFile(MultipleSourceFilename(file, ext.full_name(), &i),
	output.output());
	}
	}

	} // namespace generator
	} // namespace upb