326 lines
12 KiB
C
326 lines
12 KiB
C
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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This header is private to the ProtobolBuffers library and must NOT be
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// included by any sources outside this library. The contents of this file are
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// subject to change at any time without notice.
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#import "GPBDescriptor.h"
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#import "GPBWireFormat.h"
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// Describes attributes of the field.
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typedef NS_OPTIONS(uint16_t, GPBFieldFlags) {
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GPBFieldNone = 0,
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// These map to standard protobuf concepts.
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GPBFieldRequired = 1 << 0,
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GPBFieldRepeated = 1 << 1,
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GPBFieldPacked = 1 << 2,
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GPBFieldOptional = 1 << 3,
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GPBFieldHasDefaultValue = 1 << 4,
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// Indicates the field needs custom handling for the TextFormat name, if not
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// set, the name can be derived from the ObjC name.
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GPBFieldTextFormatNameCustom = 1 << 6,
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// Indicates the field has an enum descriptor.
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GPBFieldHasEnumDescriptor = 1 << 7,
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// These are not standard protobuf concepts, they are specific to the
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// Objective C runtime.
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// These bits are used to mark the field as a map and what the key
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// type is.
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GPBFieldMapKeyMask = 0xF << 8,
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GPBFieldMapKeyInt32 = 1 << 8,
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GPBFieldMapKeyInt64 = 2 << 8,
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GPBFieldMapKeyUInt32 = 3 << 8,
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GPBFieldMapKeyUInt64 = 4 << 8,
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GPBFieldMapKeySInt32 = 5 << 8,
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GPBFieldMapKeySInt64 = 6 << 8,
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GPBFieldMapKeyFixed32 = 7 << 8,
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GPBFieldMapKeyFixed64 = 8 << 8,
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GPBFieldMapKeySFixed32 = 9 << 8,
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GPBFieldMapKeySFixed64 = 10 << 8,
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GPBFieldMapKeyBool = 11 << 8,
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GPBFieldMapKeyString = 12 << 8,
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};
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// NOTE: The structures defined here have their members ordered to minimize
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// their size. This directly impacts the size of apps since these exist per
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// field/extension.
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// Describes a single field in a protobuf as it is represented as an ivar.
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typedef struct GPBMessageFieldDescription {
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// Name of ivar.
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const char *name;
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union {
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const char *className; // Name for message class.
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// For enums only: If EnumDescriptors are compiled in, it will be that,
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// otherwise it will be the verifier.
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GPBEnumDescriptorFunc enumDescFunc;
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GPBEnumValidationFunc enumVerifier;
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} dataTypeSpecific;
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// The field number for the ivar.
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uint32_t number;
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// The index (in bits) into _has_storage_.
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// >= 0: the bit to use for a value being set.
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// = GPBNoHasBit(INT32_MAX): no storage used.
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// < 0: in a oneOf, use a full int32 to record the field active.
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int32_t hasIndex;
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// Offset of the variable into it's structure struct.
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uint32_t offset;
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// Field flags. Use accessor functions below.
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GPBFieldFlags flags;
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// Data type of the ivar.
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GPBDataType dataType;
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} GPBMessageFieldDescription;
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// Fields in messages defined in a 'proto2' syntax file can provide a default
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// value. This struct provides the default along with the field info.
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typedef struct GPBMessageFieldDescriptionWithDefault {
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// Default value for the ivar.
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GPBGenericValue defaultValue;
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GPBMessageFieldDescription core;
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} GPBMessageFieldDescriptionWithDefault;
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// Describes attributes of the extension.
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typedef NS_OPTIONS(uint8_t, GPBExtensionOptions) {
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GPBExtensionNone = 0,
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// These map to standard protobuf concepts.
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GPBExtensionRepeated = 1 << 0,
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GPBExtensionPacked = 1 << 1,
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GPBExtensionSetWireFormat = 1 << 2,
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};
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// An extension
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typedef struct GPBExtensionDescription {
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GPBGenericValue defaultValue;
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const char *singletonName;
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const char *extendedClass;
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const char *messageOrGroupClassName;
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GPBEnumDescriptorFunc enumDescriptorFunc;
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int32_t fieldNumber;
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GPBDataType dataType;
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GPBExtensionOptions options;
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} GPBExtensionDescription;
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typedef NS_OPTIONS(uint32_t, GPBDescriptorInitializationFlags) {
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GPBDescriptorInitializationFlag_None = 0,
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GPBDescriptorInitializationFlag_FieldsWithDefault = 1 << 0,
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GPBDescriptorInitializationFlag_WireFormat = 1 << 1,
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};
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@interface GPBDescriptor () {
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@package
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NSArray *fields_;
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NSArray *oneofs_;
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uint32_t storageSize_;
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}
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// fieldDescriptions have to be long lived, they are held as raw pointers.
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+ (instancetype)
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allocDescriptorForClass:(Class)messageClass
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rootClass:(Class)rootClass
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file:(GPBFileDescriptor *)file
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fields:(void *)fieldDescriptions
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fieldCount:(uint32_t)fieldCount
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storageSize:(uint32_t)storageSize
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flags:(GPBDescriptorInitializationFlags)flags;
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- (instancetype)initWithClass:(Class)messageClass
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file:(GPBFileDescriptor *)file
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fields:(NSArray *)fields
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storageSize:(uint32_t)storage
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wireFormat:(BOOL)wireFormat;
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// Called right after init to provide extra information to avoid init having
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// an explosion of args. These pointers are recorded, so they are expected
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// to live for the lifetime of the app.
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- (void)setupOneofs:(const char **)oneofNames
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count:(uint32_t)count
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firstHasIndex:(int32_t)firstHasIndex;
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- (void)setupExtraTextInfo:(const char *)extraTextFormatInfo;
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- (void)setupExtensionRanges:(const GPBExtensionRange *)ranges count:(int32_t)count;
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- (void)setupContainingMessageClassName:(const char *)msgClassName;
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- (void)setupMessageClassNameSuffix:(NSString *)suffix;
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@end
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@interface GPBFileDescriptor ()
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- (instancetype)initWithPackage:(NSString *)package
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objcPrefix:(NSString *)objcPrefix
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syntax:(GPBFileSyntax)syntax;
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- (instancetype)initWithPackage:(NSString *)package
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syntax:(GPBFileSyntax)syntax;
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@end
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@interface GPBOneofDescriptor () {
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@package
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const char *name_;
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NSArray *fields_;
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SEL caseSel_;
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}
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// name must be long lived.
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- (instancetype)initWithName:(const char *)name fields:(NSArray *)fields;
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@end
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@interface GPBFieldDescriptor () {
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@package
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GPBMessageFieldDescription *description_;
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GPB_UNSAFE_UNRETAINED GPBOneofDescriptor *containingOneof_;
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SEL getSel_;
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SEL setSel_;
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SEL hasOrCountSel_; // *Count for map<>/repeated fields, has* otherwise.
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SEL setHasSel_;
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}
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// Single initializer
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// description has to be long lived, it is held as a raw pointer.
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- (instancetype)initWithFieldDescription:(void *)description
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includesDefault:(BOOL)includesDefault
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syntax:(GPBFileSyntax)syntax;
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@end
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@interface GPBEnumDescriptor ()
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// valueNames, values and extraTextFormatInfo have to be long lived, they are
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// held as raw pointers.
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+ (instancetype)
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allocDescriptorForName:(NSString *)name
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valueNames:(const char *)valueNames
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values:(const int32_t *)values
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count:(uint32_t)valueCount
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enumVerifier:(GPBEnumValidationFunc)enumVerifier;
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+ (instancetype)
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allocDescriptorForName:(NSString *)name
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valueNames:(const char *)valueNames
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values:(const int32_t *)values
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count:(uint32_t)valueCount
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enumVerifier:(GPBEnumValidationFunc)enumVerifier
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extraTextFormatInfo:(const char *)extraTextFormatInfo;
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- (instancetype)initWithName:(NSString *)name
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valueNames:(const char *)valueNames
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values:(const int32_t *)values
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count:(uint32_t)valueCount
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enumVerifier:(GPBEnumValidationFunc)enumVerifier;
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@end
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@interface GPBExtensionDescriptor () {
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@package
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GPBExtensionDescription *description_;
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}
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@property(nonatomic, readonly) GPBWireFormat wireType;
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// For repeated extensions, alternateWireType is the wireType with the opposite
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// value for the packable property. i.e. - if the extension was marked packed
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// it would be the wire type for unpacked; if the extension was marked unpacked,
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// it would be the wire type for packed.
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@property(nonatomic, readonly) GPBWireFormat alternateWireType;
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// description has to be long lived, it is held as a raw pointer.
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- (instancetype)initWithExtensionDescription:
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(GPBExtensionDescription *)description;
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- (NSComparisonResult)compareByFieldNumber:(GPBExtensionDescriptor *)other;
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@end
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CF_EXTERN_C_BEGIN
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// Direct access is use for speed, to avoid even internally declaring things
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// read/write, etc. The warning is enabled in the project to ensure code calling
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// protos can turn on -Wdirect-ivar-access without issues.
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdirect-ivar-access"
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GPB_INLINE BOOL GPBFieldIsMapOrArray(GPBFieldDescriptor *field) {
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return (field->description_->flags &
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(GPBFieldRepeated | GPBFieldMapKeyMask)) != 0;
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}
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GPB_INLINE GPBDataType GPBGetFieldDataType(GPBFieldDescriptor *field) {
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return field->description_->dataType;
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}
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GPB_INLINE int32_t GPBFieldHasIndex(GPBFieldDescriptor *field) {
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return field->description_->hasIndex;
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}
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GPB_INLINE uint32_t GPBFieldNumber(GPBFieldDescriptor *field) {
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return field->description_->number;
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}
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#pragma clang diagnostic pop
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uint32_t GPBFieldTag(GPBFieldDescriptor *self);
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// For repeated fields, alternateWireType is the wireType with the opposite
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// value for the packable property. i.e. - if the field was marked packed it
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// would be the wire type for unpacked; if the field was marked unpacked, it
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// would be the wire type for packed.
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uint32_t GPBFieldAlternateTag(GPBFieldDescriptor *self);
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GPB_INLINE BOOL GPBHasPreservingUnknownEnumSemantics(GPBFileSyntax syntax) {
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return syntax == GPBFileSyntaxProto3;
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}
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GPB_INLINE BOOL GPBExtensionIsRepeated(GPBExtensionDescription *description) {
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return (description->options & GPBExtensionRepeated) != 0;
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}
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GPB_INLINE BOOL GPBExtensionIsPacked(GPBExtensionDescription *description) {
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return (description->options & GPBExtensionPacked) != 0;
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}
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GPB_INLINE BOOL GPBExtensionIsWireFormat(GPBExtensionDescription *description) {
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return (description->options & GPBExtensionSetWireFormat) != 0;
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}
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// Helper for compile time assets.
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#ifndef GPBInternalCompileAssert
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#if __has_feature(c_static_assert) || __has_extension(c_static_assert)
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#define GPBInternalCompileAssert(test, msg) _Static_assert((test), #msg)
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#else
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// Pre-Xcode 7 support.
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#define GPBInternalCompileAssertSymbolInner(line, msg) GPBInternalCompileAssert ## line ## __ ## msg
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#define GPBInternalCompileAssertSymbol(line, msg) GPBInternalCompileAssertSymbolInner(line, msg)
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#define GPBInternalCompileAssert(test, msg) \
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typedef char GPBInternalCompileAssertSymbol(__LINE__, msg) [ ((test) ? 1 : -1) ]
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#endif // __has_feature(c_static_assert) || __has_extension(c_static_assert)
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#endif // GPBInternalCompileAssert
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// Sanity check that there isn't padding between the field description
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// structures with and without a default.
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GPBInternalCompileAssert(sizeof(GPBMessageFieldDescriptionWithDefault) ==
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(sizeof(GPBGenericValue) +
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sizeof(GPBMessageFieldDescription)),
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DescriptionsWithDefault_different_size_than_expected);
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CF_EXTERN_C_END
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