| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <stdlib.h> |
| |
| #include <limits> |
| #include <map> |
| #include <memory> |
| #include <set> |
| #include <string> |
| |
| #include <google/protobuf/compiler/code_generator.h> |
| #include <google/protobuf/compiler/plugin.h> |
| #include <google/protobuf/descriptor.h> |
| #include <google/protobuf/descriptor.pb.h> |
| #include <google/protobuf/io/printer.h> |
| #include <google/protobuf/io/zero_copy_stream.h> |
| |
| #include "perfetto/ext/base/string_utils.h" |
| |
| namespace protozero { |
| namespace { |
| |
| using google::protobuf::Descriptor; |
| using google::protobuf::EnumDescriptor; |
| using google::protobuf::EnumValueDescriptor; |
| using google::protobuf::FieldDescriptor; |
| using google::protobuf::FileDescriptor; |
| using google::protobuf::compiler::GeneratorContext; |
| using google::protobuf::io::Printer; |
| using google::protobuf::io::ZeroCopyOutputStream; |
| using perfetto::base::SplitString; |
| using perfetto::base::StripChars; |
| using perfetto::base::StripPrefix; |
| using perfetto::base::StripSuffix; |
| using perfetto::base::ToUpper; |
| using perfetto::base::Uppercase; |
| |
| // Keep this value in sync with ProtoDecoder::kMaxDecoderFieldId. If they go out |
| // of sync pbzero.h files will stop compiling, hitting the at() static_assert. |
| // Not worth an extra dependency. |
| constexpr int kMaxDecoderFieldId = 999; |
| |
| void Assert(bool condition) { |
| if (!condition) |
| abort(); |
| } |
| |
| struct FileDescriptorComp { |
| bool operator()(const FileDescriptor* lhs, const FileDescriptor* rhs) const { |
| int comp = lhs->name().compare(rhs->name()); |
| Assert(comp != 0 || lhs == rhs); |
| return comp < 0; |
| } |
| }; |
| |
| struct DescriptorComp { |
| bool operator()(const Descriptor* lhs, const Descriptor* rhs) const { |
| int comp = lhs->full_name().compare(rhs->full_name()); |
| Assert(comp != 0 || lhs == rhs); |
| return comp < 0; |
| } |
| }; |
| |
| struct EnumDescriptorComp { |
| bool operator()(const EnumDescriptor* lhs, const EnumDescriptor* rhs) const { |
| int comp = lhs->full_name().compare(rhs->full_name()); |
| Assert(comp != 0 || lhs == rhs); |
| return comp < 0; |
| } |
| }; |
| |
| inline std::string ProtoStubName(const FileDescriptor* proto) { |
| return StripSuffix(proto->name(), ".proto") + ".pbzero"; |
| } |
| |
| class GeneratorJob { |
| public: |
| GeneratorJob(const FileDescriptor* file, Printer* stub_h_printer) |
| : source_(file), stub_h_(stub_h_printer) {} |
| |
| bool GenerateStubs() { |
| Preprocess(); |
| GeneratePrologue(); |
| for (const EnumDescriptor* enumeration : enums_) |
| GenerateEnumDescriptor(enumeration); |
| for (const Descriptor* message : messages_) |
| GenerateMessageDescriptor(message); |
| for (const auto& key_value : extensions_) |
| GenerateExtension(key_value.first, key_value.second); |
| GenerateEpilogue(); |
| return error_.empty(); |
| } |
| |
| void SetOption(const std::string& name, const std::string& value) { |
| if (name == "wrapper_namespace") { |
| wrapper_namespace_ = value; |
| } else { |
| Abort(std::string() + "Unknown plugin option '" + name + "'."); |
| } |
| } |
| |
| // If generator fails to produce stubs for a particular proto definitions |
| // it finishes with undefined output and writes the first error occured. |
| const std::string& GetFirstError() const { return error_; } |
| |
| private: |
| // Only the first error will be recorded. |
| void Abort(const std::string& reason) { |
| if (error_.empty()) |
| error_ = reason; |
| } |
| |
| // Get full name (including outer descriptors) of proto descriptor. |
| template <class T> |
| inline std::string GetDescriptorName(const T* descriptor) { |
| if (!package_.empty()) { |
| return StripPrefix(descriptor->full_name(), package_ + "."); |
| } else { |
| return descriptor->full_name(); |
| } |
| } |
| |
| // Get C++ class name corresponding to proto descriptor. |
| // Nested names are splitted by underscores. Underscores in type names aren't |
| // prohibited but not recommended in order to avoid name collisions. |
| template <class T> |
| inline std::string GetCppClassName(const T* descriptor, bool full = false) { |
| std::string name = StripChars(GetDescriptorName(descriptor), ".", '_'); |
| if (full) |
| name = full_namespace_prefix_ + name; |
| return name; |
| } |
| |
| inline std::string GetFieldNumberConstant(const FieldDescriptor* field) { |
| std::string name = field->camelcase_name(); |
| if (!name.empty()) { |
| name.at(0) = Uppercase(name.at(0)); |
| name = "k" + name + "FieldNumber"; |
| } else { |
| // Protoc allows fields like 'bool _ = 1'. |
| Abort("Empty field name in camel case notation."); |
| } |
| return name; |
| } |
| |
| // Note: intentionally avoiding depending on protozero sources, as well as |
| // protobuf-internal WireFormat/WireFormatLite classes. |
| const char* FieldTypeToProtozeroWireType(FieldDescriptor::Type proto_type) { |
| switch (proto_type) { |
| case FieldDescriptor::TYPE_INT64: |
| case FieldDescriptor::TYPE_UINT64: |
| case FieldDescriptor::TYPE_INT32: |
| case FieldDescriptor::TYPE_BOOL: |
| case FieldDescriptor::TYPE_UINT32: |
| case FieldDescriptor::TYPE_ENUM: |
| case FieldDescriptor::TYPE_SINT32: |
| case FieldDescriptor::TYPE_SINT64: |
| return "::protozero::proto_utils::ProtoWireType::kVarInt"; |
| |
| case FieldDescriptor::TYPE_FIXED32: |
| case FieldDescriptor::TYPE_SFIXED32: |
| case FieldDescriptor::TYPE_FLOAT: |
| return "::protozero::proto_utils::ProtoWireType::kFixed32"; |
| |
| case FieldDescriptor::TYPE_FIXED64: |
| case FieldDescriptor::TYPE_SFIXED64: |
| case FieldDescriptor::TYPE_DOUBLE: |
| return "::protozero::proto_utils::ProtoWireType::kFixed64"; |
| |
| case FieldDescriptor::TYPE_STRING: |
| case FieldDescriptor::TYPE_MESSAGE: |
| case FieldDescriptor::TYPE_BYTES: |
| return "::protozero::proto_utils::ProtoWireType::kLengthDelimited"; |
| |
| case FieldDescriptor::TYPE_GROUP: |
| Abort("Groups not supported."); |
| } |
| Abort("Unrecognized FieldDescriptor::Type."); |
| return ""; |
| } |
| |
| const char* FieldTypeToPackedBufferType(FieldDescriptor::Type proto_type) { |
| switch (proto_type) { |
| case FieldDescriptor::TYPE_INT64: |
| case FieldDescriptor::TYPE_UINT64: |
| case FieldDescriptor::TYPE_INT32: |
| case FieldDescriptor::TYPE_BOOL: |
| case FieldDescriptor::TYPE_UINT32: |
| case FieldDescriptor::TYPE_ENUM: |
| case FieldDescriptor::TYPE_SINT32: |
| case FieldDescriptor::TYPE_SINT64: |
| return "::protozero::PackedVarInt"; |
| |
| case FieldDescriptor::TYPE_FIXED32: |
| return "::protozero::PackedFixedSizeInt<uint32_t>"; |
| case FieldDescriptor::TYPE_SFIXED32: |
| return "::protozero::PackedFixedSizeInt<int32_t>"; |
| case FieldDescriptor::TYPE_FLOAT: |
| return "::protozero::PackedFixedSizeInt<float>"; |
| |
| case FieldDescriptor::TYPE_FIXED64: |
| return "::protozero::PackedFixedSizeInt<uint64_t>"; |
| case FieldDescriptor::TYPE_SFIXED64: |
| return "::protozero::PackedFixedSizeInt<int64_t>"; |
| case FieldDescriptor::TYPE_DOUBLE: |
| return "::protozero::PackedFixedSizeInt<double>"; |
| |
| case FieldDescriptor::TYPE_STRING: |
| case FieldDescriptor::TYPE_MESSAGE: |
| case FieldDescriptor::TYPE_BYTES: |
| case FieldDescriptor::TYPE_GROUP: |
| Abort("Unexpected FieldDescritor::Type."); |
| } |
| Abort("Unrecognized FieldDescriptor::Type."); |
| return ""; |
| } |
| |
| const char* FieldToProtoSchemaType(const FieldDescriptor* field) { |
| switch (field->type()) { |
| case FieldDescriptor::TYPE_BOOL: |
| return "kBool"; |
| case FieldDescriptor::TYPE_INT32: |
| return "kInt32"; |
| case FieldDescriptor::TYPE_INT64: |
| return "kInt64"; |
| case FieldDescriptor::TYPE_UINT32: |
| return "kUint32"; |
| case FieldDescriptor::TYPE_UINT64: |
| return "kUint64"; |
| case FieldDescriptor::TYPE_SINT32: |
| return "kSint32"; |
| case FieldDescriptor::TYPE_SINT64: |
| return "kSint64"; |
| case FieldDescriptor::TYPE_FIXED32: |
| return "kFixed32"; |
| case FieldDescriptor::TYPE_FIXED64: |
| return "kFixed64"; |
| case FieldDescriptor::TYPE_SFIXED32: |
| return "kSfixed32"; |
| case FieldDescriptor::TYPE_SFIXED64: |
| return "kSfixed64"; |
| case FieldDescriptor::TYPE_FLOAT: |
| return "kFloat"; |
| case FieldDescriptor::TYPE_DOUBLE: |
| return "kDouble"; |
| case FieldDescriptor::TYPE_ENUM: |
| return "kEnum"; |
| case FieldDescriptor::TYPE_STRING: |
| return "kString"; |
| case FieldDescriptor::TYPE_MESSAGE: |
| return "kMessage"; |
| case FieldDescriptor::TYPE_BYTES: |
| return "kBytes"; |
| |
| case FieldDescriptor::TYPE_GROUP: |
| Abort("Groups not supported."); |
| return ""; |
| } |
| Abort("Unrecognized FieldDescriptor::Type."); |
| return ""; |
| } |
| |
| std::string FieldToCppTypeName(const FieldDescriptor* field) { |
| switch (field->type()) { |
| case FieldDescriptor::TYPE_BOOL: |
| return "bool"; |
| case FieldDescriptor::TYPE_INT32: |
| return "int32_t"; |
| case FieldDescriptor::TYPE_INT64: |
| return "int64_t"; |
| case FieldDescriptor::TYPE_UINT32: |
| return "uint32_t"; |
| case FieldDescriptor::TYPE_UINT64: |
| return "uint64_t"; |
| case FieldDescriptor::TYPE_SINT32: |
| return "int32_t"; |
| case FieldDescriptor::TYPE_SINT64: |
| return "int64_t"; |
| case FieldDescriptor::TYPE_FIXED32: |
| return "uint32_t"; |
| case FieldDescriptor::TYPE_FIXED64: |
| return "uint64_t"; |
| case FieldDescriptor::TYPE_SFIXED32: |
| return "int32_t"; |
| case FieldDescriptor::TYPE_SFIXED64: |
| return "int64_t"; |
| case FieldDescriptor::TYPE_FLOAT: |
| return "float"; |
| case FieldDescriptor::TYPE_DOUBLE: |
| return "double"; |
| case FieldDescriptor::TYPE_ENUM: |
| return GetCppClassName(field->enum_type(), true); |
| case FieldDescriptor::TYPE_STRING: |
| case FieldDescriptor::TYPE_BYTES: |
| return "std::string"; |
| case FieldDescriptor::TYPE_MESSAGE: |
| return GetCppClassName(field->message_type()); |
| case FieldDescriptor::TYPE_GROUP: |
| Abort("Groups not supported."); |
| return ""; |
| } |
| Abort("Unrecognized FieldDescriptor::Type."); |
| return ""; |
| } |
| |
| const char* FieldToRepetitionType(const FieldDescriptor* field) { |
| if (!field->is_repeated()) |
| return "kNotRepeated"; |
| if (field->is_packed()) |
| return "kRepeatedPacked"; |
| return "kRepeatedNotPacked"; |
| } |
| |
| void CollectDescriptors() { |
| // Collect message descriptors in DFS order. |
| std::vector<const Descriptor*> stack; |
| stack.reserve(static_cast<size_t>(source_->message_type_count())); |
| for (int i = 0; i < source_->message_type_count(); ++i) |
| stack.push_back(source_->message_type(i)); |
| |
| while (!stack.empty()) { |
| const Descriptor* message = stack.back(); |
| stack.pop_back(); |
| |
| if (message->extension_count() > 0) { |
| if (message->field_count() > 0 || message->nested_type_count() > 0 || |
| message->enum_type_count() > 0) { |
| Abort("message with extend blocks shouldn't contain anything else"); |
| } |
| |
| // Iterate over all fields in "extend" blocks. |
| for (int i = 0; i < message->extension_count(); ++i) { |
| const FieldDescriptor* extension = message->extension(i); |
| |
| // Protoc plugin API does not group fields in "extend" blocks. |
| // As the support for extensions in protozero is limited, the code |
| // assumes that extend blocks are located inside a wrapper message and |
| // name of this message is used to group them. |
| std::string extension_name = extension->extension_scope()->name(); |
| extensions_[extension_name].push_back(extension); |
| } |
| } else { |
| messages_.push_back(message); |
| for (int i = 0; i < message->nested_type_count(); ++i) { |
| stack.push_back(message->nested_type(i)); |
| // Emit a forward declaration of nested message types, as the outer |
| // class will refer to them when creating type aliases. |
| referenced_messages_.insert(message->nested_type(i)); |
| } |
| } |
| } |
| |
| // Collect enums. |
| for (int i = 0; i < source_->enum_type_count(); ++i) |
| enums_.push_back(source_->enum_type(i)); |
| |
| if (source_->extension_count() > 0) |
| Abort("top-level extension blocks are not supported"); |
| |
| for (const Descriptor* message : messages_) { |
| for (int i = 0; i < message->enum_type_count(); ++i) { |
| enums_.push_back(message->enum_type(i)); |
| } |
| } |
| } |
| |
| void CollectDependencies() { |
| // Public import basically means that callers only need to import this |
| // proto in order to use the stuff publicly imported by this proto. |
| for (int i = 0; i < source_->public_dependency_count(); ++i) |
| public_imports_.insert(source_->public_dependency(i)); |
| |
| if (source_->weak_dependency_count() > 0) |
| Abort("Weak imports are not supported."); |
| |
| // Validations. Collect public imports (of collected imports) in DFS order. |
| // Visibilty for current proto: |
| // - all imports listed in current proto, |
| // - public imports of everything imported (recursive). |
| std::vector<const FileDescriptor*> stack; |
| for (int i = 0; i < source_->dependency_count(); ++i) { |
| const FileDescriptor* import = source_->dependency(i); |
| stack.push_back(import); |
| if (public_imports_.count(import) == 0) { |
| private_imports_.insert(import); |
| } |
| } |
| |
| while (!stack.empty()) { |
| const FileDescriptor* import = stack.back(); |
| stack.pop_back(); |
| // Having imports under different packages leads to unnecessary |
| // complexity with namespaces. |
| if (import->package() != package_) |
| Abort("Imported proto must be in the same package."); |
| |
| for (int i = 0; i < import->public_dependency_count(); ++i) { |
| stack.push_back(import->public_dependency(i)); |
| } |
| } |
| |
| // Collect descriptors of messages and enums used in current proto. |
| // It will be used to generate necessary forward declarations and |
| // check that everything lays in the same namespace. |
| for (const Descriptor* message : messages_) { |
| for (int i = 0; i < message->field_count(); ++i) { |
| const FieldDescriptor* field = message->field(i); |
| |
| if (field->type() == FieldDescriptor::TYPE_MESSAGE) { |
| if (public_imports_.count(field->message_type()->file()) == 0) { |
| // Avoid multiple forward declarations since |
| // public imports have been already included. |
| referenced_messages_.insert(field->message_type()); |
| } |
| } else if (field->type() == FieldDescriptor::TYPE_ENUM) { |
| if (public_imports_.count(field->enum_type()->file()) == 0) { |
| referenced_enums_.insert(field->enum_type()); |
| } |
| } |
| } |
| } |
| } |
| |
| void Preprocess() { |
| // Package name maps to a series of namespaces. |
| package_ = source_->package(); |
| namespaces_ = SplitString(package_, "."); |
| if (!wrapper_namespace_.empty()) |
| namespaces_.push_back(wrapper_namespace_); |
| |
| full_namespace_prefix_ = "::"; |
| for (const std::string& ns : namespaces_) |
| full_namespace_prefix_ += ns + "::"; |
| |
| CollectDescriptors(); |
| CollectDependencies(); |
| } |
| |
| std::string GetNamespaceNameForInnerEnum(const EnumDescriptor* enumeration) { |
| return "perfetto_pbzero_enum_" + |
| GetCppClassName(enumeration->containing_type()); |
| } |
| |
| // Print top header, namespaces and forward declarations. |
| void GeneratePrologue() { |
| std::string greeting = |
| "// Autogenerated by the ProtoZero compiler plugin. DO NOT EDIT.\n"; |
| std::string guard = package_ + "_" + source_->name() + "_H_"; |
| guard = ToUpper(guard); |
| guard = StripChars(guard, ".-/\\", '_'); |
| |
| stub_h_->Print( |
| "$greeting$\n" |
| "#ifndef $guard$\n" |
| "#define $guard$\n\n" |
| "#include <stddef.h>\n" |
| "#include <stdint.h>\n\n" |
| "#include \"perfetto/protozero/field_writer.h\"\n" |
| "#include \"perfetto/protozero/message.h\"\n" |
| "#include \"perfetto/protozero/packed_repeated_fields.h\"\n" |
| "#include \"perfetto/protozero/proto_decoder.h\"\n" |
| "#include \"perfetto/protozero/proto_utils.h\"\n", |
| "greeting", greeting, "guard", guard); |
| |
| // Print includes for public imports. |
| for (const FileDescriptor* dependency : public_imports_) { |
| // Dependency name could contain slashes but importing from upper-level |
| // directories is not possible anyway since build system processes each |
| // proto file individually. Hence proto lookup path is always equal to the |
| // directory where particular proto file is located and protoc does not |
| // allow reference to upper directory (aka ..) in import path. |
| // |
| // Laconically said: |
| // - source_->name() may never have slashes, |
| // - dependency->name() may have slashes but always refers to inner path. |
| stub_h_->Print("#include \"$name$.h\"\n", "name", |
| ProtoStubName(dependency)); |
| } |
| stub_h_->Print("\n"); |
| |
| // Print namespaces. |
| for (const std::string& ns : namespaces_) { |
| stub_h_->Print("namespace $ns$ {\n", "ns", ns); |
| } |
| stub_h_->Print("\n"); |
| |
| // Print forward declarations. |
| for (const Descriptor* message : referenced_messages_) { |
| stub_h_->Print("class $class$;\n", "class", GetCppClassName(message)); |
| } |
| for (const EnumDescriptor* enumeration : referenced_enums_) { |
| if (enumeration->containing_type()) { |
| stub_h_->Print("namespace $namespace_name$ {\n", "namespace_name", |
| GetNamespaceNameForInnerEnum(enumeration)); |
| } |
| stub_h_->Print("enum $class$ : int32_t;\n", "class", enumeration->name()); |
| |
| if (enumeration->containing_type()) { |
| stub_h_->Print("} // namespace $namespace_name$\n", "namespace_name", |
| GetNamespaceNameForInnerEnum(enumeration)); |
| stub_h_->Print("using $alias$ = $namespace_name$::$short_name$;\n", |
| "alias", GetCppClassName(enumeration), "namespace_name", |
| GetNamespaceNameForInnerEnum(enumeration), "short_name", |
| enumeration->name()); |
| } |
| } |
| stub_h_->Print("\n"); |
| } |
| |
| void GenerateEnumDescriptor(const EnumDescriptor* enumeration) { |
| bool is_inner_enum = !!enumeration->containing_type(); |
| if (is_inner_enum) { |
| stub_h_->Print("namespace $namespace_name$ {\n", "namespace_name", |
| GetNamespaceNameForInnerEnum(enumeration)); |
| } |
| |
| stub_h_->Print("enum $class$ : int32_t {\n", "class", enumeration->name()); |
| stub_h_->Indent(); |
| |
| std::string min_name, max_name; |
| int min_val = std::numeric_limits<int>::max(); |
| int max_val = -1; |
| for (int i = 0; i < enumeration->value_count(); ++i) { |
| const EnumValueDescriptor* value = enumeration->value(i); |
| const std::string value_name = value->name(); |
| stub_h_->Print("$name$ = $number$,\n", "name", value_name, "number", |
| std::to_string(value->number())); |
| if (value->number() < min_val) { |
| min_val = value->number(); |
| min_name = value_name; |
| } |
| if (value->number() > max_val) { |
| max_val = value->number(); |
| max_name = value_name; |
| } |
| } |
| stub_h_->Outdent(); |
| stub_h_->Print("};\n"); |
| if (is_inner_enum) { |
| const std::string namespace_name = |
| GetNamespaceNameForInnerEnum(enumeration); |
| stub_h_->Print("} // namespace $namespace_name$\n", "namespace_name", |
| namespace_name); |
| stub_h_->Print( |
| "using $full_enum_name$ = $namespace_name$::$enum_name$;\n\n", |
| "full_enum_name", GetCppClassName(enumeration), "enum_name", |
| enumeration->name(), "namespace_name", namespace_name); |
| } |
| stub_h_->Print("\n"); |
| stub_h_->Print("constexpr $class$ $class$_MIN = $class$::$min$;\n", "class", |
| GetCppClassName(enumeration), "min", min_name); |
| stub_h_->Print("constexpr $class$ $class$_MAX = $class$::$max$;\n", "class", |
| GetCppClassName(enumeration), "max", max_name); |
| stub_h_->Print("\n"); |
| |
| GenerateEnumToStringConversion(enumeration); |
| } |
| |
| void GenerateEnumToStringConversion(const EnumDescriptor* enumeration) { |
| std::string fullClassName = |
| full_namespace_prefix_ + GetCppClassName(enumeration); |
| const char* function_header_stub = R"( |
| PERFETTO_PROTOZERO_CONSTEXPR14_OR_INLINE |
| const char* $class_name$_Name($full_class$ value) { |
| )"; |
| stub_h_->Print(function_header_stub, "full_class", fullClassName, |
| "class_name", GetCppClassName(enumeration)); |
| stub_h_->Indent(); |
| stub_h_->Print("switch (value) {"); |
| for (int index = 0; index < enumeration->value_count(); ++index) { |
| const EnumValueDescriptor* value = enumeration->value(index); |
| const char* switch_stub = R"( |
| case $full_class$::$value_name$: |
| return "$value_name$"; |
| )"; |
| stub_h_->Print(switch_stub, "full_class", fullClassName, "value_name", |
| value->name()); |
| } |
| stub_h_->Print("}\n"); |
| stub_h_->Print(R"(return "PBZERO_UNKNOWN_ENUM_VALUE";)"); |
| stub_h_->Print("\n"); |
| stub_h_->Outdent(); |
| stub_h_->Print("}\n\n"); |
| } |
| |
| // Packed repeated fields are encoded as a length-delimited field on the wire, |
| // where the payload is the concatenation of invidually encoded elements. |
| void GeneratePackedRepeatedFieldDescriptor(const FieldDescriptor* field) { |
| std::map<std::string, std::string> setter; |
| setter["name"] = field->lowercase_name(); |
| setter["field_metadata"] = GetFieldMetadataTypeName(field); |
| setter["action"] = "set"; |
| setter["buffer_type"] = FieldTypeToPackedBufferType(field->type()); |
| stub_h_->Print( |
| setter, |
| "void $action$_$name$(const $buffer_type$& packed_buffer) {\n" |
| " AppendBytes($field_metadata$::kFieldId, packed_buffer.data(),\n" |
| " packed_buffer.size());\n" |
| "}\n"); |
| } |
| |
| void GenerateSimpleFieldDescriptor(const FieldDescriptor* field) { |
| std::map<std::string, std::string> setter; |
| setter["id"] = std::to_string(field->number()); |
| setter["name"] = field->lowercase_name(); |
| setter["field_metadata"] = GetFieldMetadataTypeName(field); |
| setter["action"] = field->is_repeated() ? "add" : "set"; |
| setter["cpp_type"] = FieldToCppTypeName(field); |
| setter["proto_field_type"] = FieldToProtoSchemaType(field); |
| |
| const char* code_stub = |
| "void $action$_$name$($cpp_type$ value) {\n" |
| " static constexpr uint32_t field_id = $field_metadata$::kFieldId;\n" |
| " // Call the appropriate protozero::Message::Append(field_id, ...)\n" |
| " // method based on the type of the field.\n" |
| " ::protozero::internal::FieldWriter<\n" |
| " ::protozero::proto_utils::ProtoSchemaType::$proto_field_type$>\n" |
| " ::Append(*this, field_id, value);\n" |
| "}\n"; |
| |
| if (field->type() == FieldDescriptor::TYPE_STRING) { |
| // Strings and bytes should have an additional accessor which specifies |
| // the length explicitly. |
| const char* additional_method = |
| "void $action$_$name$(const char* data, size_t size) {\n" |
| " AppendBytes($field_metadata$::kFieldId, data, size);\n" |
| "}\n" |
| "void $action$_$name$(::protozero::ConstChars chars) {\n" |
| " AppendBytes($field_metadata$::kFieldId, chars.data, chars.size);\n" |
| "}\n"; |
| stub_h_->Print(setter, additional_method); |
| } else if (field->type() == FieldDescriptor::TYPE_BYTES) { |
| const char* additional_method = |
| "void $action$_$name$(const uint8_t* data, size_t size) {\n" |
| " AppendBytes($field_metadata$::kFieldId, data, size);\n" |
| "}\n" |
| "void $action$_$name$(::protozero::ConstBytes bytes) {\n" |
| " AppendBytes($field_metadata$::kFieldId, bytes.data, bytes.size);\n" |
| "}\n"; |
| stub_h_->Print(setter, additional_method); |
| } else if (field->type() == FieldDescriptor::TYPE_GROUP || |
| field->type() == FieldDescriptor::TYPE_MESSAGE) { |
| Abort("Unsupported field type."); |
| return; |
| } |
| |
| stub_h_->Print(setter, code_stub); |
| } |
| |
| void GenerateNestedMessageFieldDescriptor(const FieldDescriptor* field) { |
| std::string action = field->is_repeated() ? "add" : "set"; |
| std::string inner_class = GetCppClassName(field->message_type()); |
| stub_h_->Print( |
| "template <typename T = $inner_class$> T* $action$_$name$() {\n" |
| " return BeginNestedMessage<T>($id$);\n" |
| "}\n\n", |
| "id", std::to_string(field->number()), "name", field->lowercase_name(), |
| "action", action, "inner_class", inner_class); |
| if (field->options().lazy()) { |
| stub_h_->Print( |
| "void $action$_$name$_raw(const std::string& raw) {\n" |
| " return AppendBytes($id$, raw.data(), raw.size());\n" |
| "}\n\n", |
| "id", std::to_string(field->number()), "name", |
| field->lowercase_name(), "action", action, "inner_class", |
| inner_class); |
| } |
| } |
| |
| void GenerateDecoder(const Descriptor* message) { |
| int max_field_id = 0; |
| bool has_nonpacked_repeated_fields = false; |
| for (int i = 0; i < message->field_count(); ++i) { |
| const FieldDescriptor* field = message->field(i); |
| if (field->number() > kMaxDecoderFieldId) |
| continue; |
| max_field_id = std::max(max_field_id, field->number()); |
| if (field->is_repeated() && !field->is_packed()) |
| has_nonpacked_repeated_fields = true; |
| } |
| |
| std::string class_name = GetCppClassName(message) + "_Decoder"; |
| stub_h_->Print( |
| "class $name$ : public " |
| "::protozero::TypedProtoDecoder</*MAX_FIELD_ID=*/$max$, " |
| "/*HAS_NONPACKED_REPEATED_FIELDS=*/$rep$> {\n", |
| "name", class_name, "max", std::to_string(max_field_id), "rep", |
| has_nonpacked_repeated_fields ? "true" : "false"); |
| stub_h_->Print(" public:\n"); |
| stub_h_->Indent(); |
| stub_h_->Print( |
| "$name$(const uint8_t* data, size_t len) " |
| ": TypedProtoDecoder(data, len) {}\n", |
| "name", class_name); |
| stub_h_->Print( |
| "explicit $name$(const std::string& raw) : " |
| "TypedProtoDecoder(reinterpret_cast<const uint8_t*>(raw.data()), " |
| "raw.size()) {}\n", |
| "name", class_name); |
| stub_h_->Print( |
| "explicit $name$(const ::protozero::ConstBytes& raw) : " |
| "TypedProtoDecoder(raw.data, raw.size) {}\n", |
| "name", class_name); |
| |
| for (int i = 0; i < message->field_count(); ++i) { |
| const FieldDescriptor* field = message->field(i); |
| if (field->number() > max_field_id) { |
| stub_h_->Print("// field $name$ omitted because its id is too high\n", |
| "name", field->name()); |
| continue; |
| } |
| std::string getter; |
| std::string cpp_type; |
| switch (field->type()) { |
| case FieldDescriptor::TYPE_BOOL: |
| getter = "as_bool"; |
| cpp_type = "bool"; |
| break; |
| case FieldDescriptor::TYPE_SFIXED32: |
| case FieldDescriptor::TYPE_SINT32: |
| case FieldDescriptor::TYPE_INT32: |
| getter = "as_int32"; |
| cpp_type = "int32_t"; |
| break; |
| case FieldDescriptor::TYPE_SFIXED64: |
| case FieldDescriptor::TYPE_SINT64: |
| case FieldDescriptor::TYPE_INT64: |
| getter = "as_int64"; |
| cpp_type = "int64_t"; |
| break; |
| case FieldDescriptor::TYPE_FIXED32: |
| case FieldDescriptor::TYPE_UINT32: |
| getter = "as_uint32"; |
| cpp_type = "uint32_t"; |
| break; |
| case FieldDescriptor::TYPE_FIXED64: |
| case FieldDescriptor::TYPE_UINT64: |
| getter = "as_uint64"; |
| cpp_type = "uint64_t"; |
| break; |
| case FieldDescriptor::TYPE_FLOAT: |
| getter = "as_float"; |
| cpp_type = "float"; |
| break; |
| case FieldDescriptor::TYPE_DOUBLE: |
| getter = "as_double"; |
| cpp_type = "double"; |
| break; |
| case FieldDescriptor::TYPE_ENUM: |
| getter = "as_int32"; |
| cpp_type = "int32_t"; |
| break; |
| case FieldDescriptor::TYPE_STRING: |
| getter = "as_string"; |
| cpp_type = "::protozero::ConstChars"; |
| break; |
| case FieldDescriptor::TYPE_MESSAGE: |
| case FieldDescriptor::TYPE_BYTES: |
| getter = "as_bytes"; |
| cpp_type = "::protozero::ConstBytes"; |
| break; |
| case FieldDescriptor::TYPE_GROUP: |
| continue; |
| } |
| |
| stub_h_->Print("bool has_$name$() const { return at<$id$>().valid(); }\n", |
| "name", field->lowercase_name(), "id", |
| std::to_string(field->number())); |
| |
| if (field->is_packed()) { |
| const char* protozero_wire_type = |
| FieldTypeToProtozeroWireType(field->type()); |
| stub_h_->Print( |
| "::protozero::PackedRepeatedFieldIterator<$wire_type$, $cpp_type$> " |
| "$name$(bool* parse_error_ptr) const { return " |
| "GetPackedRepeated<$wire_type$, $cpp_type$>($id$, " |
| "parse_error_ptr); }\n", |
| "wire_type", protozero_wire_type, "cpp_type", cpp_type, "name", |
| field->lowercase_name(), "id", std::to_string(field->number())); |
| } else if (field->is_repeated()) { |
| stub_h_->Print( |
| "::protozero::RepeatedFieldIterator<$cpp_type$> $name$() const { " |
| "return " |
| "GetRepeated<$cpp_type$>($id$); }\n", |
| "name", field->lowercase_name(), "cpp_type", cpp_type, "id", |
| std::to_string(field->number())); |
| } else { |
| stub_h_->Print( |
| "$cpp_type$ $name$() const { return at<$id$>().$getter$(); }\n", |
| "name", field->lowercase_name(), "id", |
| std::to_string(field->number()), "cpp_type", cpp_type, "getter", |
| getter); |
| } |
| } |
| stub_h_->Outdent(); |
| stub_h_->Print("};\n\n"); |
| } |
| |
| void GenerateConstantsForMessageFields(const Descriptor* message) { |
| const bool has_fields = (message->field_count() > 0); |
| |
| // Field number constants. |
| if (has_fields) { |
| stub_h_->Print("enum : int32_t {\n"); |
| stub_h_->Indent(); |
| |
| for (int i = 0; i < message->field_count(); ++i) { |
| const FieldDescriptor* field = message->field(i); |
| stub_h_->Print("$name$ = $id$,\n", "name", |
| GetFieldNumberConstant(field), "id", |
| std::to_string(field->number())); |
| } |
| stub_h_->Outdent(); |
| stub_h_->Print("};\n"); |
| } |
| } |
| |
| void GenerateMessageDescriptor(const Descriptor* message) { |
| GenerateDecoder(message); |
| |
| stub_h_->Print( |
| "class $name$ : public ::protozero::Message {\n" |
| " public:\n", |
| "name", GetCppClassName(message)); |
| stub_h_->Indent(); |
| |
| stub_h_->Print("using Decoder = $name$_Decoder;\n", "name", |
| GetCppClassName(message)); |
| |
| GenerateConstantsForMessageFields(message); |
| |
| stub_h_->Print( |
| "static constexpr const char* GetName() { return \".$name$\"; }\n\n", |
| "name", message->full_name()); |
| |
| // Using statements for nested messages. |
| for (int i = 0; i < message->nested_type_count(); ++i) { |
| const Descriptor* nested_message = message->nested_type(i); |
| stub_h_->Print("using $local_name$ = $global_name$;\n", "local_name", |
| nested_message->name(), "global_name", |
| GetCppClassName(nested_message, true)); |
| } |
| |
| // Using statements for nested enums. |
| for (int i = 0; i < message->enum_type_count(); ++i) { |
| const EnumDescriptor* nested_enum = message->enum_type(i); |
| const char* stub = R"( |
| using $local_name$ = $global_name$; |
| static inline const char* $local_name$_Name($local_name$ value) { |
| return $global_name$_Name(value); |
| } |
| )"; |
| stub_h_->Print(stub, "local_name", nested_enum->name(), "global_name", |
| GetCppClassName(nested_enum, true)); |
| } |
| |
| // Values of nested enums. |
| for (int i = 0; i < message->enum_type_count(); ++i) { |
| const EnumDescriptor* nested_enum = message->enum_type(i); |
| |
| for (int j = 0; j < nested_enum->value_count(); ++j) { |
| const EnumValueDescriptor* value = nested_enum->value(j); |
| stub_h_->Print("static const $class$ $name$ = $class$::$name$;\n", |
| "class", nested_enum->name(), "name", value->name()); |
| } |
| } |
| |
| // Field descriptors. |
| for (int i = 0; i < message->field_count(); ++i) { |
| GenerateFieldDescriptor(GetCppClassName(message), message->field(i)); |
| } |
| |
| stub_h_->Outdent(); |
| stub_h_->Print("};\n\n"); |
| } |
| |
| std::string GetFieldMetadataTypeName(const FieldDescriptor* field) { |
| std::string name = field->camelcase_name(); |
| if (isalpha(name[0])) |
| name[0] = static_cast<char>(toupper(name[0])); |
| return "FieldMetadata_" + name; |
| } |
| |
| std::string GetFieldMetadataVariableName(const FieldDescriptor* field) { |
| std::string name = field->camelcase_name(); |
| if (isalpha(name[0])) |
| name[0] = static_cast<char>(toupper(name[0])); |
| return "k" + name; |
| } |
| |
| void GenerateFieldMetadata(const std::string& message_cpp_type, |
| const FieldDescriptor* field) { |
| const char* code_stub = R"( |
| using $field_metadata_type$ = |
| ::protozero::proto_utils::FieldMetadata< |
| $field_id$, |
| ::protozero::proto_utils::RepetitionType::$repetition_type$, |
| ::protozero::proto_utils::ProtoSchemaType::$proto_field_type$, |
| $cpp_type$, |
| $message_cpp_type$>; |
| |
| // Ceci n'est pas une pipe. |
| // This is actually a variable of FieldMetadataHelper<FieldMetadata<...>> |
| // type (and users are expected to use it as such, hence kCamelCase name). |
| // It is declared as a function to keep protozero bindings header-only as |
| // inline constexpr variables are not available until C++17 (while inline |
| // functions are). |
| // TODO(altimin): Use inline variable instead after adopting C++17. |
| static constexpr $field_metadata_type$ $field_metadata_var$() { return {}; } |
| )"; |
| |
| stub_h_->Print(code_stub, "field_id", std::to_string(field->number()), |
| "repetition_type", FieldToRepetitionType(field), |
| "proto_field_type", FieldToProtoSchemaType(field), |
| "cpp_type", FieldToCppTypeName(field), "message_cpp_type", |
| message_cpp_type, "field_metadata_type", |
| GetFieldMetadataTypeName(field), "field_metadata_var", |
| GetFieldMetadataVariableName(field)); |
| } |
| |
| void GenerateFieldDescriptor(const std::string& message_cpp_type, |
| const FieldDescriptor* field) { |
| GenerateFieldMetadata(message_cpp_type, field); |
| if (field->is_packed()) { |
| GeneratePackedRepeatedFieldDescriptor(field); |
| } else if (field->type() != FieldDescriptor::TYPE_MESSAGE) { |
| GenerateSimpleFieldDescriptor(field); |
| } else { |
| GenerateNestedMessageFieldDescriptor(field); |
| } |
| } |
| |
| // Generate extension class for a group of FieldDescriptor instances |
| // representing one "extend" block in proto definition. For example: |
| // |
| // message SpecificExtension { |
| // extend GeneralThing { |
| // optional Fizz fizz = 101; |
| // optional Buzz buzz = 102; |
| // } |
| // } |
| // |
| // This is going to be passed as a vector of two elements, "fizz" and |
| // "buzz". Wrapping message is used to provide a name for generated |
| // extension class. |
| // |
| // In the example above, generated code is going to look like: |
| // |
| // class SpecificExtension : public GeneralThing { |
| // Fizz* set_fizz(); |
| // Buzz* set_buzz(); |
| // } |
| void GenerateExtension( |
| const std::string& extension_name, |
| const std::vector<const FieldDescriptor*>& descriptors) { |
| // Use an arbitrary descriptor in order to get generic information not |
| // specific to any of them. |
| const FieldDescriptor* descriptor = descriptors[0]; |
| const Descriptor* base_message = descriptor->containing_type(); |
| |
| // TODO(ddrone): ensure that this code works when containing_type located in |
| // other file or namespace. |
| stub_h_->Print("class $name$ : public $extendee$ {\n", "name", |
| extension_name, "extendee", |
| GetCppClassName(base_message, /*full=*/true)); |
| stub_h_->Print(" public:\n"); |
| stub_h_->Indent(); |
| for (const FieldDescriptor* field : descriptors) { |
| if (field->containing_type() != base_message) { |
| Abort("one wrapper should extend only one message"); |
| return; |
| } |
| GenerateFieldDescriptor(extension_name, field); |
| } |
| stub_h_->Outdent(); |
| stub_h_->Print("};\n"); |
| } |
| |
| void GenerateEpilogue() { |
| for (unsigned i = 0; i < namespaces_.size(); ++i) { |
| stub_h_->Print("} // Namespace.\n"); |
| } |
| stub_h_->Print("#endif // Include guard.\n"); |
| } |
| |
| const FileDescriptor* const source_; |
| Printer* const stub_h_; |
| std::string error_; |
| |
| std::string package_; |
| std::string wrapper_namespace_; |
| std::vector<std::string> namespaces_; |
| std::string full_namespace_prefix_; |
| std::vector<const Descriptor*> messages_; |
| std::vector<const EnumDescriptor*> enums_; |
| std::map<std::string, std::vector<const FieldDescriptor*>> extensions_; |
| |
| // The custom *Comp comparators are to ensure determinism of the generator. |
| std::set<const FileDescriptor*, FileDescriptorComp> public_imports_; |
| std::set<const FileDescriptor*, FileDescriptorComp> private_imports_; |
| std::set<const Descriptor*, DescriptorComp> referenced_messages_; |
| std::set<const EnumDescriptor*, EnumDescriptorComp> referenced_enums_; |
| }; |
| |
| class ProtoZeroGenerator : public ::google::protobuf::compiler::CodeGenerator { |
| public: |
| explicit ProtoZeroGenerator(); |
| ~ProtoZeroGenerator() override; |
| |
| // CodeGenerator implementation |
| bool Generate(const google::protobuf::FileDescriptor* file, |
| const std::string& options, |
| GeneratorContext* context, |
| std::string* error) const override; |
| }; |
| |
| ProtoZeroGenerator::ProtoZeroGenerator() {} |
| |
| ProtoZeroGenerator::~ProtoZeroGenerator() {} |
| |
| bool ProtoZeroGenerator::Generate(const FileDescriptor* file, |
| const std::string& options, |
| GeneratorContext* context, |
| std::string* error) const { |
| const std::unique_ptr<ZeroCopyOutputStream> stub_h_file_stream( |
| context->Open(ProtoStubName(file) + ".h")); |
| const std::unique_ptr<ZeroCopyOutputStream> stub_cc_file_stream( |
| context->Open(ProtoStubName(file) + ".cc")); |
| |
| // Variables are delimited by $. |
| Printer stub_h_printer(stub_h_file_stream.get(), '$'); |
| GeneratorJob job(file, &stub_h_printer); |
| |
| Printer stub_cc_printer(stub_cc_file_stream.get(), '$'); |
| stub_cc_printer.Print("// Intentionally empty (crbug.com/998165)\n"); |
| |
| // Parse additional options. |
| for (const std::string& option : SplitString(options, ",")) { |
| std::vector<std::string> option_pair = SplitString(option, "="); |
| job.SetOption(option_pair[0], option_pair[1]); |
| } |
| |
| if (!job.GenerateStubs()) { |
| *error = job.GetFirstError(); |
| return false; |
| } |
| return true; |
| } |
| |
| } // namespace |
| } // namespace protozero |
| |
| int main(int argc, char* argv[]) { |
| ::protozero::ProtoZeroGenerator generator; |
| return google::protobuf::compiler::PluginMain(argc, argv, &generator); |
| } |
