diff options
Diffstat (limited to 'third_party/protobuf/3.6.0/src/google/protobuf/compiler/cpp/cpp_helpers.cc')
| -rw-r--r-- | third_party/protobuf/3.6.0/src/google/protobuf/compiler/cpp/cpp_helpers.cc | 867 |
1 files changed, 867 insertions, 0 deletions
diff --git a/third_party/protobuf/3.6.0/src/google/protobuf/compiler/cpp/cpp_helpers.cc b/third_party/protobuf/3.6.0/src/google/protobuf/compiler/cpp/cpp_helpers.cc new file mode 100644 index 0000000000..163dac0aa0 --- /dev/null +++ b/third_party/protobuf/3.6.0/src/google/protobuf/compiler/cpp/cpp_helpers.cc @@ -0,0 +1,867 @@ +// Protocol Buffers - Google's data interchange format +// Copyright 2008 Google Inc. All rights reserved. +// https://developers.google.com/protocol-buffers/ +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// Author: kenton@google.com (Kenton Varda) +// Based on original Protocol Buffers design by +// Sanjay Ghemawat, Jeff Dean, and others. + +#include <google/protobuf/stubs/hash.h> +#include <limits> +#include <map> +#include <queue> +#include <vector> + +#include <google/protobuf/stubs/logging.h> +#include <google/protobuf/stubs/common.h> +#include <google/protobuf/compiler/cpp/cpp_helpers.h> +#include <google/protobuf/io/printer.h> +#include <google/protobuf/io/zero_copy_stream.h> +#include <google/protobuf/stubs/strutil.h> +#include <google/protobuf/stubs/substitute.h> + + + + +namespace google { +namespace protobuf { +namespace compiler { +namespace cpp { + +namespace { + +static const char kAnyMessageName[] = "Any"; +static const char kAnyProtoFile[] = "google/protobuf/any.proto"; +static const char kGoogleProtobufPrefix[] = "google/protobuf/"; + +string DotsToUnderscores(const string& name) { + return StringReplace(name, ".", "_", true); +} + +string DotsToColons(const string& name) { + return StringReplace(name, ".", "::", true); +} + +const char* const kKeywordList[] = { + "alignas", "alignof", "and", "and_eq", "asm", "auto", "bitand", "bitor", + "bool", "break", "case", "catch", "char", "class", "compl", "const", + "constexpr", "const_cast", "continue", "decltype", "default", "delete", "do", + "double", "dynamic_cast", "else", "enum", "explicit", "export", "extern", + "false", "float", "for", "friend", "goto", "if", "inline", "int", "long", + "mutable", "namespace", "new", "noexcept", "not", "not_eq", "nullptr", + "operator", "or", "or_eq", "private", "protected", "public", "register", + "reinterpret_cast", "return", "short", "signed", "sizeof", "static", + "static_assert", "static_cast", "struct", "switch", "template", "this", + "thread_local", "throw", "true", "try", "typedef", "typeid", "typename", + "union", "unsigned", "using", "virtual", "void", "volatile", "wchar_t", + "while", "xor", "xor_eq" +}; + +hash_set<string> MakeKeywordsMap() { + hash_set<string> result; + for (int i = 0; i < GOOGLE_ARRAYSIZE(kKeywordList); i++) { + result.insert(kKeywordList[i]); + } + return result; +} + +hash_set<string> kKeywords = MakeKeywordsMap(); + +// Returns whether the provided descriptor has an extension. This includes its +// nested types. +bool HasExtension(const Descriptor* descriptor) { + if (descriptor->extension_count() > 0) { + return true; + } + for (int i = 0; i < descriptor->nested_type_count(); ++i) { + if (HasExtension(descriptor->nested_type(i))) { + return true; + } + } + return false; +} + +// Encode [0..63] as 'A'-'Z', 'a'-'z', '0'-'9', '_' +char Base63Char(int value) { + GOOGLE_CHECK_GE(value, 0); + if (value < 26) return 'A' + value; + value -= 26; + if (value < 26) return 'a' + value; + value -= 26; + if (value < 10) return '0' + value; + GOOGLE_CHECK_EQ(value, 10); + return '_'; +} + +// Given a c identifier has 63 legal characters we can't implement base64 +// encoding. So we return the k least significant "digits" in base 63. +template <typename I> +string Base63(I n, int k) { + string res; + while (k-- > 0) { + res += Base63Char(static_cast<int>(n % 63)); + n /= 63; + } + return res; +} + +} // namespace + +string UnderscoresToCamelCase(const string& input, bool cap_next_letter) { + string result; + // Note: I distrust ctype.h due to locales. + for (int i = 0; i < input.size(); i++) { + if ('a' <= input[i] && input[i] <= 'z') { + if (cap_next_letter) { + result += input[i] + ('A' - 'a'); + } else { + result += input[i]; + } + cap_next_letter = false; + } else if ('A' <= input[i] && input[i] <= 'Z') { + // Capital letters are left as-is. + result += input[i]; + cap_next_letter = false; + } else if ('0' <= input[i] && input[i] <= '9') { + result += input[i]; + cap_next_letter = true; + } else { + cap_next_letter = true; + } + } + return result; +} + +const char kThickSeparator[] = + "// ===================================================================\n"; +const char kThinSeparator[] = + "// -------------------------------------------------------------------\n"; + +bool CanInitializeByZeroing(const FieldDescriptor* field) { + if (field->is_repeated() || field->is_extension()) return false; + switch (field->cpp_type()) { + case FieldDescriptor::CPPTYPE_ENUM: + return field->default_value_enum()->number() == 0; + case FieldDescriptor::CPPTYPE_INT32: + return field->default_value_int32() == 0; + case FieldDescriptor::CPPTYPE_INT64: + return field->default_value_int64() == 0; + case FieldDescriptor::CPPTYPE_UINT32: + return field->default_value_uint32() == 0; + case FieldDescriptor::CPPTYPE_UINT64: + return field->default_value_uint64() == 0; + case FieldDescriptor::CPPTYPE_FLOAT: + return field->default_value_float() == 0; + case FieldDescriptor::CPPTYPE_DOUBLE: + return field->default_value_double() == 0; + case FieldDescriptor::CPPTYPE_BOOL: + return field->default_value_bool() == false; + default: + return false; + } +} + +string ClassName(const Descriptor* descriptor) { + const Descriptor* parent = descriptor->containing_type(); + string res; + if (parent) res += ClassName(parent) + "_"; + res += descriptor->name(); + if (IsMapEntryMessage(descriptor)) res += "_DoNotUse"; + return res; +} + +string ClassName(const EnumDescriptor* enum_descriptor) { + if (enum_descriptor->containing_type() == NULL) { + return enum_descriptor->name(); + } else { + return ClassName(enum_descriptor->containing_type()) + "_" + + enum_descriptor->name(); + } +} + +string Namespace(const string& package) { + if (package.empty()) return ""; + return "::" + DotsToColons(package); +} + +string DefaultInstanceName(const Descriptor* descriptor) { + string prefix = descriptor->file()->package().empty() ? "" : "::"; + return prefix + DotsToColons(descriptor->file()->package()) + "::_" + + ClassName(descriptor, false) + "_default_instance_"; +} + +string ReferenceFunctionName(const Descriptor* descriptor) { + return QualifiedClassName(descriptor) + "_ReferenceStrong"; +} + +string SuperClassName(const Descriptor* descriptor, const Options& options) { + return HasDescriptorMethods(descriptor->file(), options) + ? "::google::protobuf::Message" + : "::google::protobuf::MessageLite"; +} + +string FieldName(const FieldDescriptor* field) { + string result = field->name(); + LowerString(&result); + if (kKeywords.count(result) > 0) { + result.append("_"); + } + return result; +} + +string EnumValueName(const EnumValueDescriptor* enum_value) { + string result = enum_value->name(); + if (kKeywords.count(result) > 0) { + result.append("_"); + } + return result; +} + +int EstimateAlignmentSize(const FieldDescriptor* field) { + if (field == NULL) return 0; + if (field->is_repeated()) return 8; + switch (field->cpp_type()) { + case FieldDescriptor::CPPTYPE_BOOL: + return 1; + + case FieldDescriptor::CPPTYPE_INT32: + case FieldDescriptor::CPPTYPE_UINT32: + case FieldDescriptor::CPPTYPE_ENUM: + case FieldDescriptor::CPPTYPE_FLOAT: + return 4; + + case FieldDescriptor::CPPTYPE_INT64: + case FieldDescriptor::CPPTYPE_UINT64: + case FieldDescriptor::CPPTYPE_DOUBLE: + case FieldDescriptor::CPPTYPE_STRING: + case FieldDescriptor::CPPTYPE_MESSAGE: + return 8; + } + GOOGLE_LOG(FATAL) << "Can't get here."; + return -1; // Make compiler happy. +} + +string FieldConstantName(const FieldDescriptor *field) { + string field_name = UnderscoresToCamelCase(field->name(), true); + string result = "k" + field_name + "FieldNumber"; + + if (!field->is_extension() && + field->containing_type()->FindFieldByCamelcaseName( + field->camelcase_name()) != field) { + // This field's camelcase name is not unique. As a hack, add the field + // number to the constant name. This makes the constant rather useless, + // but what can we do? + result += "_" + SimpleItoa(field->number()); + } + + return result; +} + +string FieldMessageTypeName(const FieldDescriptor* field) { + // Note: The Google-internal version of Protocol Buffers uses this function + // as a hook point for hacks to support legacy code. + return ClassName(field->message_type(), true); +} + +string StripProto(const string& filename) { + if (HasSuffixString(filename, ".protodevel")) { + return StripSuffixString(filename, ".protodevel"); + } else { + return StripSuffixString(filename, ".proto"); + } +} + +const char* PrimitiveTypeName(FieldDescriptor::CppType type) { + switch (type) { + case FieldDescriptor::CPPTYPE_INT32 : return "::google::protobuf::int32"; + case FieldDescriptor::CPPTYPE_INT64 : return "::google::protobuf::int64"; + case FieldDescriptor::CPPTYPE_UINT32 : return "::google::protobuf::uint32"; + case FieldDescriptor::CPPTYPE_UINT64 : return "::google::protobuf::uint64"; + case FieldDescriptor::CPPTYPE_DOUBLE : return "double"; + case FieldDescriptor::CPPTYPE_FLOAT : return "float"; + case FieldDescriptor::CPPTYPE_BOOL : return "bool"; + case FieldDescriptor::CPPTYPE_ENUM : return "int"; + case FieldDescriptor::CPPTYPE_STRING : return "::std::string"; + case FieldDescriptor::CPPTYPE_MESSAGE: return NULL; + + // No default because we want the compiler to complain if any new + // CppTypes are added. + } + + GOOGLE_LOG(FATAL) << "Can't get here."; + return NULL; +} + +const char* DeclaredTypeMethodName(FieldDescriptor::Type type) { + switch (type) { + case FieldDescriptor::TYPE_INT32 : return "Int32"; + case FieldDescriptor::TYPE_INT64 : return "Int64"; + case FieldDescriptor::TYPE_UINT32 : return "UInt32"; + case FieldDescriptor::TYPE_UINT64 : return "UInt64"; + case FieldDescriptor::TYPE_SINT32 : return "SInt32"; + case FieldDescriptor::TYPE_SINT64 : return "SInt64"; + case FieldDescriptor::TYPE_FIXED32 : return "Fixed32"; + case FieldDescriptor::TYPE_FIXED64 : return "Fixed64"; + case FieldDescriptor::TYPE_SFIXED32: return "SFixed32"; + case FieldDescriptor::TYPE_SFIXED64: return "SFixed64"; + case FieldDescriptor::TYPE_FLOAT : return "Float"; + case FieldDescriptor::TYPE_DOUBLE : return "Double"; + + case FieldDescriptor::TYPE_BOOL : return "Bool"; + case FieldDescriptor::TYPE_ENUM : return "Enum"; + + case FieldDescriptor::TYPE_STRING : return "String"; + case FieldDescriptor::TYPE_BYTES : return "Bytes"; + case FieldDescriptor::TYPE_GROUP : return "Group"; + case FieldDescriptor::TYPE_MESSAGE : return "Message"; + + // No default because we want the compiler to complain if any new + // types are added. + } + GOOGLE_LOG(FATAL) << "Can't get here."; + return ""; +} + +string Int32ToString(int number) { + // gcc rejects the decimal form of kint32min. + if (number == kint32min) { + GOOGLE_COMPILE_ASSERT(kint32min == (~0x7fffffff), kint32min_value_error); + return "(~0x7fffffff)"; + } else { + return SimpleItoa(number); + } +} + +string Int64ToString(int64 number) { + // gcc rejects the decimal form of kint64min + if (number == kint64min) { + // Make sure we are in a 2's complement system. + GOOGLE_COMPILE_ASSERT(kint64min == GOOGLE_LONGLONG(~0x7fffffffffffffff), + kint64min_value_error); + return "GOOGLE_LONGLONG(~0x7fffffffffffffff)"; + } + return "GOOGLE_LONGLONG(" + SimpleItoa(number) + ")"; +} + +string DefaultValue(const FieldDescriptor* field) { + switch (field->cpp_type()) { + case FieldDescriptor::CPPTYPE_INT32: + return Int32ToString(field->default_value_int32()); + case FieldDescriptor::CPPTYPE_UINT32: + return SimpleItoa(field->default_value_uint32()) + "u"; + case FieldDescriptor::CPPTYPE_INT64: + return Int64ToString(field->default_value_int64()); + case FieldDescriptor::CPPTYPE_UINT64: + return "GOOGLE_ULONGLONG(" + SimpleItoa(field->default_value_uint64())+ ")"; + case FieldDescriptor::CPPTYPE_DOUBLE: { + double value = field->default_value_double(); + if (value == std::numeric_limits<double>::infinity()) { + return "::google::protobuf::internal::Infinity()"; + } else if (value == -std::numeric_limits<double>::infinity()) { + return "-::google::protobuf::internal::Infinity()"; + } else if (value != value) { + return "::google::protobuf::internal::NaN()"; + } else { + return SimpleDtoa(value); + } + } + case FieldDescriptor::CPPTYPE_FLOAT: + { + float value = field->default_value_float(); + if (value == std::numeric_limits<float>::infinity()) { + return "static_cast<float>(::google::protobuf::internal::Infinity())"; + } else if (value == -std::numeric_limits<float>::infinity()) { + return "static_cast<float>(-::google::protobuf::internal::Infinity())"; + } else if (value != value) { + return "static_cast<float>(::google::protobuf::internal::NaN())"; + } else { + string float_value = SimpleFtoa(value); + // If floating point value contains a period (.) or an exponent + // (either E or e), then append suffix 'f' to make it a float + // literal. + if (float_value.find_first_of(".eE") != string::npos) { + float_value.push_back('f'); + } + return float_value; + } + } + case FieldDescriptor::CPPTYPE_BOOL: + return field->default_value_bool() ? "true" : "false"; + case FieldDescriptor::CPPTYPE_ENUM: + // Lazy: Generate a static_cast because we don't have a helper function + // that constructs the full name of an enum value. + return strings::Substitute( + "static_cast< $0 >($1)", + ClassName(field->enum_type(), true), + Int32ToString(field->default_value_enum()->number())); + case FieldDescriptor::CPPTYPE_STRING: + return "\"" + EscapeTrigraphs( + CEscape(field->default_value_string())) + + "\""; + case FieldDescriptor::CPPTYPE_MESSAGE: + return "*" + FieldMessageTypeName(field) + + "::internal_default_instance()"; + } + // Can't actually get here; make compiler happy. (We could add a default + // case above but then we wouldn't get the nice compiler warning when a + // new type is added.) + GOOGLE_LOG(FATAL) << "Can't get here."; + return ""; +} + +// Convert a file name into a valid identifier. +string FilenameIdentifier(const string& filename) { + string result; + for (int i = 0; i < filename.size(); i++) { + if (ascii_isalnum(filename[i])) { + result.push_back(filename[i]); + } else { + // Not alphanumeric. To avoid any possibility of name conflicts we + // use the hex code for the character. + StrAppend(&result, "_", strings::Hex(static_cast<uint8>(filename[i]))); + } + } + return result; +} + +string FileLevelNamespace(const string& filename) { + return "protobuf_" + FilenameIdentifier(filename); +} + +// Return the qualified C++ name for a file level symbol. +string QualifiedFileLevelSymbol(const string& package, const string& name) { + if (package.empty()) { + return StrCat("::", name); + } + return StrCat("::", DotsToColons(package), "::", name); +} + +// Escape C++ trigraphs by escaping question marks to \? +string EscapeTrigraphs(const string& to_escape) { + return StringReplace(to_escape, "?", "\\?", true); +} + +// Escaped function name to eliminate naming conflict. +string SafeFunctionName(const Descriptor* descriptor, + const FieldDescriptor* field, + const string& prefix) { + // Do not use FieldName() since it will escape keywords. + string name = field->name(); + LowerString(&name); + string function_name = prefix + name; + if (descriptor->FindFieldByName(function_name)) { + // Single underscore will also make it conflicting with the private data + // member. We use double underscore to escape function names. + function_name.append("__"); + } else if (kKeywords.count(name) > 0) { + // If the field name is a keyword, we append the underscore back to keep it + // consistent with other function names. + function_name.append("_"); + } + return function_name; +} + + +static bool HasMapFields(const Descriptor* descriptor) { + for (int i = 0; i < descriptor->field_count(); ++i) { + if (descriptor->field(i)->is_map()) { + return true; + } + } + for (int i = 0; i < descriptor->nested_type_count(); ++i) { + if (HasMapFields(descriptor->nested_type(i))) return true; + } + return false; +} + +bool HasMapFields(const FileDescriptor* file) { + for (int i = 0; i < file->message_type_count(); ++i) { + if (HasMapFields(file->message_type(i))) return true; + } + return false; +} + +static bool HasEnumDefinitions(const Descriptor* message_type) { + if (message_type->enum_type_count() > 0) return true; + for (int i = 0; i < message_type->nested_type_count(); ++i) { + if (HasEnumDefinitions(message_type->nested_type(i))) return true; + } + return false; +} + +bool HasEnumDefinitions(const FileDescriptor* file) { + if (file->enum_type_count() > 0) return true; + for (int i = 0; i < file->message_type_count(); ++i) { + if (HasEnumDefinitions(file->message_type(i))) return true; + } + return false; +} + +bool IsStringOrMessage(const FieldDescriptor* field) { + switch (field->cpp_type()) { + case FieldDescriptor::CPPTYPE_INT32: + case FieldDescriptor::CPPTYPE_INT64: + case FieldDescriptor::CPPTYPE_UINT32: + case FieldDescriptor::CPPTYPE_UINT64: + case FieldDescriptor::CPPTYPE_DOUBLE: + case FieldDescriptor::CPPTYPE_FLOAT: + case FieldDescriptor::CPPTYPE_BOOL: + case FieldDescriptor::CPPTYPE_ENUM: + return false; + case FieldDescriptor::CPPTYPE_STRING: + case FieldDescriptor::CPPTYPE_MESSAGE: + return true; + } + + GOOGLE_LOG(FATAL) << "Can't get here."; + return false; +} + +FieldOptions::CType EffectiveStringCType(const FieldDescriptor* field) { + GOOGLE_DCHECK(field->cpp_type() == FieldDescriptor::CPPTYPE_STRING); + // Open-source protobuf release only supports STRING ctype. + return FieldOptions::STRING; + +} + +bool IsAnyMessage(const FileDescriptor* descriptor) { + return descriptor->name() == kAnyProtoFile; +} + +bool IsAnyMessage(const Descriptor* descriptor) { + return descriptor->name() == kAnyMessageName && + descriptor->file()->name() == kAnyProtoFile; +} + +bool IsWellKnownMessage(const FileDescriptor* descriptor) { + return !descriptor->name().compare(0, 16, kGoogleProtobufPrefix); +} + +enum Utf8CheckMode { + STRICT = 0, // Parsing will fail if non UTF-8 data is in string fields. + VERIFY = 1, // Only log an error but parsing will succeed. + NONE = 2, // No UTF-8 check. +}; + +// Which level of UTF-8 enforcemant is placed on this file. +static Utf8CheckMode GetUtf8CheckMode(const FieldDescriptor* field, + const Options& options) { + if (field->file()->syntax() == FileDescriptor::SYNTAX_PROTO3) { + return STRICT; + } else if (GetOptimizeFor(field->file(), options) != + FileOptions::LITE_RUNTIME) { + return VERIFY; + } else { + return NONE; + } +} + +static void GenerateUtf8CheckCode(const FieldDescriptor* field, + const Options& options, bool for_parse, + const std::map<string, string>& variables, + const char* parameters, + const char* strict_function, + const char* verify_function, + io::Printer* printer) { + switch (GetUtf8CheckMode(field, options)) { + case STRICT: { + if (for_parse) { + printer->Print("DO_("); + } + printer->Print( + "::google::protobuf::internal::WireFormatLite::$function$(\n", + "function", strict_function); + printer->Indent(); + printer->Print(variables, parameters); + if (for_parse) { + printer->Print("::google::protobuf::internal::WireFormatLite::PARSE,\n"); + } else { + printer->Print("::google::protobuf::internal::WireFormatLite::SERIALIZE,\n"); + } + printer->Print("\"$full_name$\")", "full_name", field->full_name()); + if (for_parse) { + printer->Print(")"); + } + printer->Print(";\n"); + printer->Outdent(); + break; + } + case VERIFY: { + printer->Print( + "::google::protobuf::internal::WireFormat::$function$(\n", + "function", verify_function); + printer->Indent(); + printer->Print(variables, parameters); + if (for_parse) { + printer->Print("::google::protobuf::internal::WireFormat::PARSE,\n"); + } else { + printer->Print("::google::protobuf::internal::WireFormat::SERIALIZE,\n"); + } + printer->Print("\"$full_name$\");\n", "full_name", field->full_name()); + printer->Outdent(); + break; + } + case NONE: + break; + } +} + +void GenerateUtf8CheckCodeForString(const FieldDescriptor* field, + const Options& options, bool for_parse, + const std::map<string, string>& variables, + const char* parameters, + io::Printer* printer) { + GenerateUtf8CheckCode(field, options, for_parse, variables, parameters, + "VerifyUtf8String", "VerifyUTF8StringNamedField", + printer); +} + +void GenerateUtf8CheckCodeForCord(const FieldDescriptor* field, + const Options& options, bool for_parse, + const std::map<string, string>& variables, + const char* parameters, + io::Printer* printer) { + GenerateUtf8CheckCode(field, options, for_parse, variables, parameters, + "VerifyUtf8Cord", "VerifyUTF8CordNamedField", printer); +} + +namespace { + +void Flatten(const Descriptor* descriptor, + std::vector<const Descriptor*>* flatten) { + for (int i = 0; i < descriptor->nested_type_count(); i++) + Flatten(descriptor->nested_type(i), flatten); + flatten->push_back(descriptor); +} + +} // namespace + +void FlattenMessagesInFile(const FileDescriptor* file, + std::vector<const Descriptor*>* result) { + for (int i = 0; i < file->message_type_count(); i++) { + Flatten(file->message_type(i), result); + } +} + +bool HasWeakFields(const Descriptor* descriptor) { + return false; +} + +bool HasWeakFields(const FileDescriptor* file) { + return false; +} + +bool UsingImplicitWeakFields(const FileDescriptor* file, + const Options& options) { + return options.lite_implicit_weak_fields && + GetOptimizeFor(file, options) == FileOptions::LITE_RUNTIME; +} + +bool IsImplicitWeakField(const FieldDescriptor* field, const Options& options, + SCCAnalyzer* scc_analyzer) { + return UsingImplicitWeakFields(field->file(), options) && + field->type() == FieldDescriptor::TYPE_MESSAGE && + !field->is_required() && !field->is_map() && + field->containing_oneof() == NULL && + !IsWellKnownMessage(field->message_type()->file()) && + // We do not support implicit weak fields between messages in the same + // strongly-connected component. + scc_analyzer->GetSCC(field->containing_type()) != + scc_analyzer->GetSCC(field->message_type()); +} + +struct CompareDescriptors { + bool operator()(const Descriptor* a, const Descriptor* b) { + return a->full_name() < b->full_name(); + } +}; + +SCCAnalyzer::NodeData SCCAnalyzer::DFS(const Descriptor* descriptor) { + // Must not have visited already. + GOOGLE_DCHECK_EQ(cache_.count(descriptor), 0); + + // Mark visited by inserting in map. + NodeData& result = cache_[descriptor]; + // Initialize data structures. + result.index = result.lowlink = index_++; + stack_.push_back(descriptor); + + // Recurse the fields / nodes in graph + for (int i = 0; i < descriptor->field_count(); i++) { + const Descriptor* child = descriptor->field(i)->message_type(); + if (child) { + if (cache_.count(child) == 0) { + // unexplored node + NodeData child_data = DFS(child); + result.lowlink = std::min(result.lowlink, child_data.lowlink); + } else { + NodeData child_data = cache_[child]; + if (child_data.scc == NULL) { + // Still in the stack_ so we found a back edge + result.lowlink = std::min(result.lowlink, child_data.index); + } + } + } + } + if (result.index == result.lowlink) { + // This is the root of a strongly connected component + SCC* scc = CreateSCC(); + while (true) { + const Descriptor* scc_desc = stack_.back(); + scc->descriptors.push_back(scc_desc); + // Remove from stack + stack_.pop_back(); + cache_[scc_desc].scc = scc; + + if (scc_desc == descriptor) break; + } + + // The order of descriptors is random and depends how this SCC was + // discovered. In-order to ensure maximum stability we sort it by name. + std::sort(scc->descriptors.begin(), scc->descriptors.end(), + CompareDescriptors()); + AddChildren(scc); + } + return result; +} + +void SCCAnalyzer::AddChildren(SCC* scc) { + std::set<const SCC*> seen; + for (int i = 0; i < scc->descriptors.size(); i++) { + const Descriptor* descriptor = scc->descriptors[i]; + for (int j = 0; j < descriptor->field_count(); j++) { + const Descriptor* child_msg = descriptor->field(j)->message_type(); + if (child_msg) { + const SCC* child = GetSCC(child_msg); + if (child == scc) continue; + if (seen.insert(child).second) { + scc->children.push_back(child); + } + } + } + } +} + +MessageAnalysis SCCAnalyzer::GetSCCAnalysis(const SCC* scc) { + if (analysis_cache_.count(scc)) return analysis_cache_[scc]; + MessageAnalysis result = MessageAnalysis(); + for (int i = 0; i < scc->descriptors.size(); i++) { + const Descriptor* descriptor = scc->descriptors[i]; + if (descriptor->extension_range_count() > 0) { + result.contains_extension = true; + } + for (int i = 0; i < descriptor->field_count(); i++) { + const FieldDescriptor* field = descriptor->field(i); + if (field->is_required()) { + result.contains_required = true; + } + switch (field->type()) { + case FieldDescriptor::TYPE_STRING: + case FieldDescriptor::TYPE_BYTES: { + if (field->options().ctype() == FieldOptions::CORD) { + result.contains_cord = true; + } + break; + } + case FieldDescriptor::TYPE_GROUP: + case FieldDescriptor::TYPE_MESSAGE: { + const SCC* child = GetSCC(field->message_type()); + if (child != scc) { + MessageAnalysis analysis = GetSCCAnalysis(child); + result.contains_cord |= analysis.contains_cord; + result.contains_extension |= analysis.contains_extension; + if (!ShouldIgnoreRequiredFieldCheck(field, options_)) { + result.contains_required |= analysis.contains_required; + } + } else { + // This field points back into the same SCC hence the messages + // in the SCC are recursive. Note if SCC contains more than two + // nodes it has to be recursive, however this test also works for + // a single node that is recursive. + result.is_recursive = true; + } + break; + } + default: + break; + } + } + } + // We deliberately only insert the result here. After we contracted the SCC + // in the graph, the graph should be a DAG. Hence we shouldn't need to mark + // nodes visited as we can never return to them. By inserting them here + // we will go in an infinite loop if the SCC is not correct. + return analysis_cache_[scc] = result; +} + +void ListAllFields(const Descriptor* d, + std::vector<const FieldDescriptor*>* fields) { + // Collect sub messages + for (int i = 0; i < d->nested_type_count(); i++) { + ListAllFields(d->nested_type(i), fields); + } + // Collect message level extensions. + for (int i = 0; i < d->extension_count(); i++) { + fields->push_back(d->extension(i)); + } + // Add types of fields necessary + for (int i = 0; i < d->field_count(); i++) { + fields->push_back(d->field(i)); + } +} + +void ListAllFields(const FileDescriptor* d, + std::vector<const FieldDescriptor*>* fields) { + // Collect file level message. + for (int i = 0; i < d->message_type_count(); i++) { + ListAllFields(d->message_type(i), fields); + } + // Collect message level extensions. + for (int i = 0; i < d->extension_count(); i++) { + fields->push_back(d->extension(i)); + } +} + +void ListAllTypesForServices(const FileDescriptor* fd, + std::vector<const Descriptor*>* types) { + for (int i = 0; i < fd->service_count(); i++) { + const ServiceDescriptor* sd = fd->service(i); + for (int j = 0; j < sd->method_count(); j++) { + const MethodDescriptor* method = sd->method(j); + types->push_back(method->input_type()); + types->push_back(method->output_type()); + } + } +} + + +} // namespace cpp +} // namespace compiler +} // namespace protobuf +} // namespace google |