blob: 6ee6bafe9b5374c4d19aa4b98ba473905d85d31d [file] [log] [blame]
// 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 <memory>
#include "google/protobuf/descriptor.upb.h"
#include "upb/reflection/def.hpp"
#include "upb/util/def_to_proto.h"
#include "upb_generator/common.h"
#include "upb_generator/file_layout.h"
#include "upb_generator/plugin.h"
namespace upb {
namespace generator {
namespace {
std::string DefInitSymbol(upb::FileDefPtr file) {
return ToCIdent(file.name()) + "_upbdefinit";
}
static std::string DefHeaderFilename(upb::FileDefPtr file) {
return StripExtension(file.name()) + ".upbdefs.h";
}
static std::string DefSourceFilename(upb::FileDefPtr file) {
return StripExtension(file.name()) + ".upbdefs.c";
}
void GenerateMessageDefAccessor(upb::MessageDefPtr d, Output& output) {
output("UPB_INLINE const upb_MessageDef *$0_getmsgdef(upb_DefPool *s) {\n",
ToCIdent(d.full_name()));
output(" _upb_DefPool_LoadDefInit(s, &$0);\n", DefInitSymbol(d.file()));
output(" return upb_DefPool_FindMessageByName(s, \"$0\");\n", d.full_name());
output("}\n");
output("\n");
}
void WriteDefHeader(upb::FileDefPtr file, Output& output) {
EmitFileWarning(file.name(), output);
output(
"#ifndef $0_UPBDEFS_H_\n"
"#define $0_UPBDEFS_H_\n\n"
"#include \"upb/reflection/def.h\"\n"
"#include \"upb/reflection/internal/def_pool.h\"\n"
"\n"
"#include \"upb/port/def.inc\" // Must be last.\n"
"#ifdef __cplusplus\n"
"extern \"C\" {\n"
"#endif\n\n",
ToPreproc(file.name()));
output("extern _upb_DefPool_Init $0;\n", DefInitSymbol(file));
output("\n");
for (auto msg : SortedMessages(file)) {
GenerateMessageDefAccessor(msg, output);
}
output(
"#ifdef __cplusplus\n"
"} /* extern \"C\" */\n"
"#endif\n"
"\n"
"#include \"upb/port/undef.inc\"\n"
"\n"
"#endif /* $0_UPBDEFS_H_ */\n",
ToPreproc(file.name()));
}
void WriteDefSource(upb::FileDefPtr file, Output& output) {
EmitFileWarning(file.name(), output);
output("#include \"upb/reflection/def.h\"\n");
output("#include \"$0\"\n", DefHeaderFilename(file));
output("#include \"$0\"\n", MiniTableHeaderFilename(file));
output("\n");
for (int i = 0; i < file.dependency_count(); i++) {
output("extern _upb_DefPool_Init $0;\n", DefInitSymbol(file.dependency(i)));
}
upb::Arena arena;
google_protobuf_FileDescriptorProto* file_proto =
upb_FileDef_ToProto(file.ptr(), arena.ptr());
size_t serialized_size;
const char* serialized = google_protobuf_FileDescriptorProto_serialize(
file_proto, arena.ptr(), &serialized_size);
absl::string_view file_data(serialized, serialized_size);
output("static const char descriptor[$0] = {", serialized_size);
// C90 only guarantees that strings can be up to 509 characters, and some
// implementations have limits here (for example, MSVC only allows 64k:
// https://docs.microsoft.com/en-us/cpp/error-messages/compiler-errors-1/fatal-error-c1091.
// So we always emit an array instead of a string.
for (size_t i = 0; i < serialized_size;) {
for (size_t j = 0; j < 25 && i < serialized_size; ++i, ++j) {
output("'$0', ", absl::CEscape(file_data.substr(i, 1)));
}
output("\n");
}
output("};\n\n");
output("static _upb_DefPool_Init *deps[$0] = {\n",
file.dependency_count() + 1);
for (int i = 0; i < file.dependency_count(); i++) {
output(" &$0,\n", DefInitSymbol(file.dependency(i)));
}
output(" NULL\n");
output("};\n");
output("\n");
output("_upb_DefPool_Init $0 = {\n", DefInitSymbol(file));
output(" deps,\n");
output(" &$0,\n", FileLayoutName(file));
output(" \"$0\",\n", file.name());
output(" UPB_STRINGVIEW_INIT(descriptor, $0)\n", file_data.size());
output("};\n");
}
void GenerateFile(upb::FileDefPtr file, Plugin* plugin) {
Output h_def_output;
WriteDefHeader(file, h_def_output);
plugin->AddOutputFile(DefHeaderFilename(file), h_def_output.output());
Output c_def_output;
WriteDefSource(file, c_def_output);
plugin->AddOutputFile(DefSourceFilename(file), c_def_output.output());
}
} // namespace
} // namespace generator
} // namespace upb
int main(int argc, char** argv) {
upb::generator::Plugin plugin;
if (!plugin.parameter().empty()) {
plugin.SetError(
absl::StrCat("Expected no parameters, got: ", plugin.parameter()));
return 0;
}
plugin.GenerateFiles([&](upb::FileDefPtr file) {
upb::generator::GenerateFile(file, &plugin);
});
return 0;
}