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GPBMessage.m
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GPBMessage.m
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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#import <Foundation/Foundation.h>
#import "GPBMessage_PackagePrivate.h"
#import <objc/message.h>
#import <objc/runtime.h>
#import <os/lock.h>
#import <stdatomic.h>
#import "GPBArray_PackagePrivate.h"
#import "GPBCodedInputStream_PackagePrivate.h"
#import "GPBCodedOutputStream_PackagePrivate.h"
#import "GPBDescriptor_PackagePrivate.h"
#import "GPBDictionary_PackagePrivate.h"
#import "GPBExtensionInternals.h"
#import "GPBExtensionRegistry.h"
#import "GPBRootObject_PackagePrivate.h"
#import "GPBUnknownFieldSet_PackagePrivate.h"
#import "GPBUtilities_PackagePrivate.h"
// Returns a new instance that was automatically created by |autocreator| for
// its field |field|.
static GPBMessage *GPBCreateMessageWithAutocreator(Class msgClass, GPBMessage *autocreator,
GPBFieldDescriptor *field)
__attribute__((ns_returns_retained));
// Direct access is use for speed, to avoid even internally declaring things
// read/write, etc. The warning is enabled in the project to ensure code calling
// protos can turn on -Wdirect-ivar-access without issues.
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdirect-ivar-access"
NSString *const GPBMessageErrorDomain = GPBNSStringifySymbol(GPBMessageErrorDomain);
NSString *const GPBErrorReasonKey = @"Reason";
static NSString *const kGPBDataCoderKey = @"GPBData";
// Length-delimited has a max size of 2GB, and thus messages do also.
// src/google/protobuf/message_lite also does this enforcement on the C++ side. Validation for
// parsing is done with GPBCodedInputStream; but for messages, it is less checks to do it within
// the message side since the input stream code calls these same bottlenecks.
// https://protobuf.dev/programming-guides/encoding/#cheat-sheet
static const size_t kMaximumMessageSize = 0x7fffffff;
NSString *const GPBMessageExceptionMessageTooLarge =
GPBNSStringifySymbol(GPBMessageExceptionMessageTooLarge);
//
// PLEASE REMEMBER:
//
// This is the base class for *all* messages generated, so any selector defined,
// *public* or *private* could end up colliding with a proto message field. So
// avoid using selectors that could match a property, use C functions to hide
// them, etc.
//
@interface GPBMessage () {
@package
GPBUnknownFieldSet *unknownFields_;
NSMutableDictionary *extensionMap_;
// Readonly access to autocreatedExtensionMap_ is protected via readOnlyLock_.
NSMutableDictionary *autocreatedExtensionMap_;
// If the object was autocreated, we remember the creator so that if we get
// mutated, we can inform the creator to make our field visible.
GPBMessage *autocreator_;
GPBFieldDescriptor *autocreatorField_;
GPBExtensionDescriptor *autocreatorExtension_;
// Messages can only be mutated from one thread. But some *readonly* operations modify internal
// state because they autocreate things. The autocreatedExtensionMap_ is one such structure.
// Access during readonly operations is protected via this lock.
//
// Long ago, this was an OSSpinLock, but then it came to light that there were issues for that on
// iOS:
// http://mjtsai.com/blog/2015/12/16/osspinlock-is-unsafe/
// https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20151214/000372.html
// It was changed to a dispatch_semaphore_t, but that has potential for priority inversion issues.
// The minOS versions are now high enough that os_unfair_lock can be used, and should provide
// all the support we need. For more information in the concurrency/locking space see:
// https://gist.github.com/tclementdev/6af616354912b0347cdf6db159c37057
// https://developer.apple.com/library/archive/documentation/Performance/Conceptual/EnergyGuide-iOS/PrioritizeWorkWithQoS.html
// https://developer.apple.com/videos/play/wwdc2017/706/
os_unfair_lock readOnlyLock_;
}
@end
static id CreateArrayForField(GPBFieldDescriptor *field, GPBMessage *autocreator)
__attribute__((ns_returns_retained));
static id GetOrCreateArrayIvarWithField(GPBMessage *self, GPBFieldDescriptor *field);
static id GetArrayIvarWithField(GPBMessage *self, GPBFieldDescriptor *field);
static id CreateMapForField(GPBFieldDescriptor *field, GPBMessage *autocreator)
__attribute__((ns_returns_retained));
static id GetOrCreateMapIvarWithField(GPBMessage *self, GPBFieldDescriptor *field);
static id GetMapIvarWithField(GPBMessage *self, GPBFieldDescriptor *field);
static NSMutableDictionary *CloneExtensionMap(NSDictionary *extensionMap, NSZone *zone)
__attribute__((ns_returns_retained));
static GPBUnknownFieldSet *GetOrMakeUnknownFields(GPBMessage *self);
#if defined(DEBUG) && DEBUG
static NSError *MessageError(NSInteger code, NSDictionary *userInfo) {
return [NSError errorWithDomain:GPBMessageErrorDomain code:code userInfo:userInfo];
}
#endif
static NSError *ErrorFromException(NSException *exception) {
NSError *error = nil;
if ([exception.name isEqual:GPBCodedInputStreamException]) {
NSDictionary *exceptionInfo = exception.userInfo;
error = exceptionInfo[GPBCodedInputStreamUnderlyingErrorKey];
}
if (!error) {
NSString *reason = exception.reason;
NSDictionary *userInfo = nil;
if ([reason length]) {
userInfo = @{GPBErrorReasonKey : reason};
}
error = [NSError errorWithDomain:GPBMessageErrorDomain
code:GPBMessageErrorCodeOther
userInfo:userInfo];
}
return error;
}
static void CheckExtension(GPBMessage *self, GPBExtensionDescriptor *extension) {
if (![self isKindOfClass:extension.containingMessageClass]) {
[NSException raise:NSInvalidArgumentException
format:@"Extension %@ used on wrong class (%@ instead of %@)",
extension.singletonName, [self class], extension.containingMessageClass];
}
}
static NSMutableDictionary *CloneExtensionMap(NSDictionary *extensionMap, NSZone *zone) {
if (extensionMap.count == 0) {
return nil;
}
NSMutableDictionary *result =
[[NSMutableDictionary allocWithZone:zone] initWithCapacity:extensionMap.count];
for (GPBExtensionDescriptor *extension in extensionMap) {
id value = [extensionMap objectForKey:extension];
BOOL isMessageExtension = GPBExtensionIsMessage(extension);
if (extension.repeated) {
if (isMessageExtension) {
NSMutableArray *list = [[NSMutableArray alloc] initWithCapacity:[value count]];
for (GPBMessage *listValue in value) {
GPBMessage *copiedValue = [listValue copyWithZone:zone];
[list addObject:copiedValue];
[copiedValue release];
}
[result setObject:list forKey:extension];
[list release];
} else {
NSMutableArray *copiedValue = [value mutableCopyWithZone:zone];
[result setObject:copiedValue forKey:extension];
[copiedValue release];
}
} else {
if (isMessageExtension) {
GPBMessage *copiedValue = [value copyWithZone:zone];
[result setObject:copiedValue forKey:extension];
[copiedValue release];
} else {
[result setObject:value forKey:extension];
}
}
}
return result;
}
static id CreateArrayForField(GPBFieldDescriptor *field, GPBMessage *autocreator) {
id result;
GPBDataType fieldDataType = GPBGetFieldDataType(field);
switch (fieldDataType) {
case GPBDataTypeBool:
result = [[GPBBoolArray alloc] init];
break;
case GPBDataTypeFixed32:
case GPBDataTypeUInt32:
result = [[GPBUInt32Array alloc] init];
break;
case GPBDataTypeInt32:
case GPBDataTypeSFixed32:
case GPBDataTypeSInt32:
result = [[GPBInt32Array alloc] init];
break;
case GPBDataTypeFixed64:
case GPBDataTypeUInt64:
result = [[GPBUInt64Array alloc] init];
break;
case GPBDataTypeInt64:
case GPBDataTypeSFixed64:
case GPBDataTypeSInt64:
result = [[GPBInt64Array alloc] init];
break;
case GPBDataTypeFloat:
result = [[GPBFloatArray alloc] init];
break;
case GPBDataTypeDouble:
result = [[GPBDoubleArray alloc] init];
break;
case GPBDataTypeEnum:
result = [[GPBEnumArray alloc] initWithValidationFunction:field.enumDescriptor.enumVerifier];
break;
case GPBDataTypeBytes:
case GPBDataTypeGroup:
case GPBDataTypeMessage:
case GPBDataTypeString:
if (autocreator) {
result = [[GPBAutocreatedArray alloc] init];
} else {
result = [[NSMutableArray alloc] init];
}
break;
}
if (autocreator) {
if (GPBDataTypeIsObject(fieldDataType)) {
GPBAutocreatedArray *autoArray = result;
autoArray->_autocreator = autocreator;
} else {
GPBInt32Array *gpbArray = result;
gpbArray->_autocreator = autocreator;
}
}
return result;
}
static id CreateMapForField(GPBFieldDescriptor *field, GPBMessage *autocreator) {
id result;
GPBDataType keyDataType = field.mapKeyDataType;
GPBDataType valueDataType = GPBGetFieldDataType(field);
switch (keyDataType) {
case GPBDataTypeBool:
switch (valueDataType) {
case GPBDataTypeBool:
result = [[GPBBoolBoolDictionary alloc] init];
break;
case GPBDataTypeFixed32:
case GPBDataTypeUInt32:
result = [[GPBBoolUInt32Dictionary alloc] init];
break;
case GPBDataTypeInt32:
case GPBDataTypeSFixed32:
case GPBDataTypeSInt32:
result = [[GPBBoolInt32Dictionary alloc] init];
break;
case GPBDataTypeFixed64:
case GPBDataTypeUInt64:
result = [[GPBBoolUInt64Dictionary alloc] init];
break;
case GPBDataTypeInt64:
case GPBDataTypeSFixed64:
case GPBDataTypeSInt64:
result = [[GPBBoolInt64Dictionary alloc] init];
break;
case GPBDataTypeFloat:
result = [[GPBBoolFloatDictionary alloc] init];
break;
case GPBDataTypeDouble:
result = [[GPBBoolDoubleDictionary alloc] init];
break;
case GPBDataTypeEnum:
result = [[GPBBoolEnumDictionary alloc]
initWithValidationFunction:field.enumDescriptor.enumVerifier];
break;
case GPBDataTypeBytes:
case GPBDataTypeMessage:
case GPBDataTypeString:
result = [[GPBBoolObjectDictionary alloc] init];
break;
case GPBDataTypeGroup:
NSCAssert(NO, @"shouldn't happen");
return nil;
}
break;
case GPBDataTypeFixed32:
case GPBDataTypeUInt32:
switch (valueDataType) {
case GPBDataTypeBool:
result = [[GPBUInt32BoolDictionary alloc] init];
break;
case GPBDataTypeFixed32:
case GPBDataTypeUInt32:
result = [[GPBUInt32UInt32Dictionary alloc] init];
break;
case GPBDataTypeInt32:
case GPBDataTypeSFixed32:
case GPBDataTypeSInt32:
result = [[GPBUInt32Int32Dictionary alloc] init];
break;
case GPBDataTypeFixed64:
case GPBDataTypeUInt64:
result = [[GPBUInt32UInt64Dictionary alloc] init];
break;
case GPBDataTypeInt64:
case GPBDataTypeSFixed64:
case GPBDataTypeSInt64:
result = [[GPBUInt32Int64Dictionary alloc] init];
break;
case GPBDataTypeFloat:
result = [[GPBUInt32FloatDictionary alloc] init];
break;
case GPBDataTypeDouble:
result = [[GPBUInt32DoubleDictionary alloc] init];
break;
case GPBDataTypeEnum:
result = [[GPBUInt32EnumDictionary alloc]
initWithValidationFunction:field.enumDescriptor.enumVerifier];
break;
case GPBDataTypeBytes:
case GPBDataTypeMessage:
case GPBDataTypeString:
result = [[GPBUInt32ObjectDictionary alloc] init];
break;
case GPBDataTypeGroup:
NSCAssert(NO, @"shouldn't happen");
return nil;
}
break;
case GPBDataTypeInt32:
case GPBDataTypeSFixed32:
case GPBDataTypeSInt32:
switch (valueDataType) {
case GPBDataTypeBool:
result = [[GPBInt32BoolDictionary alloc] init];
break;
case GPBDataTypeFixed32:
case GPBDataTypeUInt32:
result = [[GPBInt32UInt32Dictionary alloc] init];
break;
case GPBDataTypeInt32:
case GPBDataTypeSFixed32:
case GPBDataTypeSInt32:
result = [[GPBInt32Int32Dictionary alloc] init];
break;
case GPBDataTypeFixed64:
case GPBDataTypeUInt64:
result = [[GPBInt32UInt64Dictionary alloc] init];
break;
case GPBDataTypeInt64:
case GPBDataTypeSFixed64:
case GPBDataTypeSInt64:
result = [[GPBInt32Int64Dictionary alloc] init];
break;
case GPBDataTypeFloat:
result = [[GPBInt32FloatDictionary alloc] init];
break;
case GPBDataTypeDouble:
result = [[GPBInt32DoubleDictionary alloc] init];
break;
case GPBDataTypeEnum:
result = [[GPBInt32EnumDictionary alloc]
initWithValidationFunction:field.enumDescriptor.enumVerifier];
break;
case GPBDataTypeBytes:
case GPBDataTypeMessage:
case GPBDataTypeString:
result = [[GPBInt32ObjectDictionary alloc] init];
break;
case GPBDataTypeGroup:
NSCAssert(NO, @"shouldn't happen");
return nil;
}
break;
case GPBDataTypeFixed64:
case GPBDataTypeUInt64:
switch (valueDataType) {
case GPBDataTypeBool:
result = [[GPBUInt64BoolDictionary alloc] init];
break;
case GPBDataTypeFixed32:
case GPBDataTypeUInt32:
result = [[GPBUInt64UInt32Dictionary alloc] init];
break;
case GPBDataTypeInt32:
case GPBDataTypeSFixed32:
case GPBDataTypeSInt32:
result = [[GPBUInt64Int32Dictionary alloc] init];
break;
case GPBDataTypeFixed64:
case GPBDataTypeUInt64:
result = [[GPBUInt64UInt64Dictionary alloc] init];
break;
case GPBDataTypeInt64:
case GPBDataTypeSFixed64:
case GPBDataTypeSInt64:
result = [[GPBUInt64Int64Dictionary alloc] init];
break;
case GPBDataTypeFloat:
result = [[GPBUInt64FloatDictionary alloc] init];
break;
case GPBDataTypeDouble:
result = [[GPBUInt64DoubleDictionary alloc] init];
break;
case GPBDataTypeEnum:
result = [[GPBUInt64EnumDictionary alloc]
initWithValidationFunction:field.enumDescriptor.enumVerifier];
break;
case GPBDataTypeBytes:
case GPBDataTypeMessage:
case GPBDataTypeString:
result = [[GPBUInt64ObjectDictionary alloc] init];
break;
case GPBDataTypeGroup:
NSCAssert(NO, @"shouldn't happen");
return nil;
}
break;
case GPBDataTypeInt64:
case GPBDataTypeSFixed64:
case GPBDataTypeSInt64:
switch (valueDataType) {
case GPBDataTypeBool:
result = [[GPBInt64BoolDictionary alloc] init];
break;
case GPBDataTypeFixed32:
case GPBDataTypeUInt32:
result = [[GPBInt64UInt32Dictionary alloc] init];
break;
case GPBDataTypeInt32:
case GPBDataTypeSFixed32:
case GPBDataTypeSInt32:
result = [[GPBInt64Int32Dictionary alloc] init];
break;
case GPBDataTypeFixed64:
case GPBDataTypeUInt64:
result = [[GPBInt64UInt64Dictionary alloc] init];
break;
case GPBDataTypeInt64:
case GPBDataTypeSFixed64:
case GPBDataTypeSInt64:
result = [[GPBInt64Int64Dictionary alloc] init];
break;
case GPBDataTypeFloat:
result = [[GPBInt64FloatDictionary alloc] init];
break;
case GPBDataTypeDouble:
result = [[GPBInt64DoubleDictionary alloc] init];
break;
case GPBDataTypeEnum:
result = [[GPBInt64EnumDictionary alloc]
initWithValidationFunction:field.enumDescriptor.enumVerifier];
break;
case GPBDataTypeBytes:
case GPBDataTypeMessage:
case GPBDataTypeString:
result = [[GPBInt64ObjectDictionary alloc] init];
break;
case GPBDataTypeGroup:
NSCAssert(NO, @"shouldn't happen");
return nil;
}
break;
case GPBDataTypeString:
switch (valueDataType) {
case GPBDataTypeBool:
result = [[GPBStringBoolDictionary alloc] init];
break;
case GPBDataTypeFixed32:
case GPBDataTypeUInt32:
result = [[GPBStringUInt32Dictionary alloc] init];
break;
case GPBDataTypeInt32:
case GPBDataTypeSFixed32:
case GPBDataTypeSInt32:
result = [[GPBStringInt32Dictionary alloc] init];
break;
case GPBDataTypeFixed64:
case GPBDataTypeUInt64:
result = [[GPBStringUInt64Dictionary alloc] init];
break;
case GPBDataTypeInt64:
case GPBDataTypeSFixed64:
case GPBDataTypeSInt64:
result = [[GPBStringInt64Dictionary alloc] init];
break;
case GPBDataTypeFloat:
result = [[GPBStringFloatDictionary alloc] init];
break;
case GPBDataTypeDouble:
result = [[GPBStringDoubleDictionary alloc] init];
break;
case GPBDataTypeEnum:
result = [[GPBStringEnumDictionary alloc]
initWithValidationFunction:field.enumDescriptor.enumVerifier];
break;
case GPBDataTypeBytes:
case GPBDataTypeMessage:
case GPBDataTypeString:
if (autocreator) {
result = [[GPBAutocreatedDictionary alloc] init];
} else {
result = [[NSMutableDictionary alloc] init];
}
break;
case GPBDataTypeGroup:
NSCAssert(NO, @"shouldn't happen");
return nil;
}
break;
case GPBDataTypeFloat:
case GPBDataTypeDouble:
case GPBDataTypeEnum:
case GPBDataTypeBytes:
case GPBDataTypeGroup:
case GPBDataTypeMessage:
NSCAssert(NO, @"shouldn't happen");
return nil;
}
if (autocreator) {
if ((keyDataType == GPBDataTypeString) && GPBDataTypeIsObject(valueDataType)) {
GPBAutocreatedDictionary *autoDict = result;
autoDict->_autocreator = autocreator;
} else {
GPBInt32Int32Dictionary *gpbDict = result;
gpbDict->_autocreator = autocreator;
}
}
return result;
}
#if !defined(__clang_analyzer__)
// These functions are blocked from the analyzer because the analyzer sees the
// GPBSetRetainedObjectIvarWithFieldPrivate() call as consuming the array/map,
// so use of the array/map after the call returns is flagged as a use after
// free.
// But GPBSetRetainedObjectIvarWithFieldPrivate() is "consuming" the retain
// count be holding onto the object (it is transferring it), the object is
// still valid after returning from the call. The other way to avoid this
// would be to add a -retain/-autorelease, but that would force every
// repeated/map field parsed into the autorelease pool which is both a memory
// and performance hit.
static id GetOrCreateArrayIvarWithField(GPBMessage *self, GPBFieldDescriptor *field) {
id array = GPBGetObjectIvarWithFieldNoAutocreate(self, field);
if (!array) {
// No lock needed, this is called from places expecting to mutate
// so no threading protection is needed.
array = CreateArrayForField(field, nil);
GPBSetRetainedObjectIvarWithFieldPrivate(self, field, array);
}
return array;
}
// This is like GPBGetObjectIvarWithField(), but for arrays, it should
// only be used to wire the method into the class.
static id GetArrayIvarWithField(GPBMessage *self, GPBFieldDescriptor *field) {
uint8_t *storage = (uint8_t *)self->messageStorage_;
_Atomic(id) *typePtr = (_Atomic(id) *)&storage[field->description_->offset];
id array = atomic_load(typePtr);
if (array) {
return array;
}
id expected = nil;
id autocreated = CreateArrayForField(field, self);
if (atomic_compare_exchange_strong(typePtr, &expected, autocreated)) {
// Value was set, return it.
return autocreated;
}
// Some other thread set it, release the one created and return what got set.
if (GPBFieldDataTypeIsObject(field)) {
GPBAutocreatedArray *autoArray = autocreated;
autoArray->_autocreator = nil;
} else {
GPBInt32Array *gpbArray = autocreated;
gpbArray->_autocreator = nil;
}
[autocreated release];
return expected;
}
static id GetOrCreateMapIvarWithField(GPBMessage *self, GPBFieldDescriptor *field) {
id dict = GPBGetObjectIvarWithFieldNoAutocreate(self, field);
if (!dict) {
// No lock needed, this is called from places expecting to mutate
// so no threading protection is needed.
dict = CreateMapForField(field, nil);
GPBSetRetainedObjectIvarWithFieldPrivate(self, field, dict);
}
return dict;
}
// This is like GPBGetObjectIvarWithField(), but for maps, it should
// only be used to wire the method into the class.
static id GetMapIvarWithField(GPBMessage *self, GPBFieldDescriptor *field) {
uint8_t *storage = (uint8_t *)self->messageStorage_;
_Atomic(id) *typePtr = (_Atomic(id) *)&storage[field->description_->offset];
id dict = atomic_load(typePtr);
if (dict) {
return dict;
}
id expected = nil;
id autocreated = CreateMapForField(field, self);
if (atomic_compare_exchange_strong(typePtr, &expected, autocreated)) {
// Value was set, return it.
return autocreated;
}
// Some other thread set it, release the one created and return what got set.
if ((field.mapKeyDataType == GPBDataTypeString) && GPBFieldDataTypeIsObject(field)) {
GPBAutocreatedDictionary *autoDict = autocreated;
autoDict->_autocreator = nil;
} else {
GPBInt32Int32Dictionary *gpbDict = autocreated;
gpbDict->_autocreator = nil;
}
[autocreated release];
return expected;
}
#endif // !defined(__clang_analyzer__)
static void DecodeSingleValueFromInputStream(GPBExtensionDescriptor *extension,
GPBMessage *messageToGetExtension,
GPBCodedInputStream *input,
id<GPBExtensionRegistry> extensionRegistry,
BOOL isRepeated, GPBMessage *targetMessage) {
GPBExtensionDescription *description = extension->description_;
#if defined(DEBUG) && DEBUG && !defined(NS_BLOCK_ASSERTIONS)
if (GPBDataTypeIsMessage(description->dataType)) {
NSCAssert(targetMessage != nil, @"Internal error: must have a target message");
} else {
NSCAssert(targetMessage == nil, @"Internal error: should not have a target message");
}
#endif
GPBCodedInputStreamState *state = &input->state_;
id nsValue;
switch (description->dataType) {
case GPBDataTypeBool: {
BOOL value = GPBCodedInputStreamReadBool(state);
nsValue = [[NSNumber alloc] initWithBool:value];
break;
}
case GPBDataTypeFixed32: {
uint32_t value = GPBCodedInputStreamReadFixed32(state);
nsValue = [[NSNumber alloc] initWithUnsignedInt:value];
break;
}
case GPBDataTypeSFixed32: {
int32_t value = GPBCodedInputStreamReadSFixed32(state);
nsValue = [[NSNumber alloc] initWithInt:value];
break;
}
case GPBDataTypeFloat: {
float value = GPBCodedInputStreamReadFloat(state);
nsValue = [[NSNumber alloc] initWithFloat:value];
break;
}
case GPBDataTypeFixed64: {
uint64_t value = GPBCodedInputStreamReadFixed64(state);
nsValue = [[NSNumber alloc] initWithUnsignedLongLong:value];
break;
}
case GPBDataTypeSFixed64: {
int64_t value = GPBCodedInputStreamReadSFixed64(state);
nsValue = [[NSNumber alloc] initWithLongLong:value];
break;
}
case GPBDataTypeDouble: {
double value = GPBCodedInputStreamReadDouble(state);
nsValue = [[NSNumber alloc] initWithDouble:value];
break;
}
case GPBDataTypeInt32: {
int32_t value = GPBCodedInputStreamReadInt32(state);
nsValue = [[NSNumber alloc] initWithInt:value];
break;
}
case GPBDataTypeInt64: {
int64_t value = GPBCodedInputStreamReadInt64(state);
nsValue = [[NSNumber alloc] initWithLongLong:value];
break;
}
case GPBDataTypeSInt32: {
int32_t value = GPBCodedInputStreamReadSInt32(state);
nsValue = [[NSNumber alloc] initWithInt:value];
break;
}
case GPBDataTypeSInt64: {
int64_t value = GPBCodedInputStreamReadSInt64(state);
nsValue = [[NSNumber alloc] initWithLongLong:value];
break;
}
case GPBDataTypeUInt32: {
uint32_t value = GPBCodedInputStreamReadUInt32(state);
nsValue = [[NSNumber alloc] initWithUnsignedInt:value];
break;
}
case GPBDataTypeUInt64: {
uint64_t value = GPBCodedInputStreamReadUInt64(state);
nsValue = [[NSNumber alloc] initWithUnsignedLongLong:value];
break;
}
case GPBDataTypeBytes:
nsValue = GPBCodedInputStreamReadRetainedBytes(state);
break;
case GPBDataTypeString:
nsValue = GPBCodedInputStreamReadRetainedString(state);
break;
case GPBDataTypeEnum: {
int32_t val = GPBCodedInputStreamReadEnum(&input->state_);
GPBEnumDescriptor *enumDescriptor = extension.enumDescriptor;
// If run with source generated before the closed enum support, all enums
// will be considers not closed, so casing to the enum type for a switch
// could cause things to fall off the end of a switch.
if (!enumDescriptor.isClosed || enumDescriptor.enumVerifier(val)) {
nsValue = [[NSNumber alloc] initWithInt:val];
} else {
GPBUnknownFieldSet *unknownFields = GetOrMakeUnknownFields(messageToGetExtension);
[unknownFields mergeVarintField:extension->description_->fieldNumber value:val];
nsValue = nil;
}
break;
}
case GPBDataTypeGroup:
case GPBDataTypeMessage: {
if (description->dataType == GPBDataTypeGroup) {
[input readGroup:description->fieldNumber
message:targetMessage
extensionRegistry:extensionRegistry];
} else {
// description->dataType == GPBDataTypeMessage
if (GPBExtensionIsWireFormat(description)) {
// For MessageSet fields the message length will have already been
// read.
[targetMessage mergeFromCodedInputStream:input extensionRegistry:extensionRegistry];
} else {
[input readMessage:targetMessage extensionRegistry:extensionRegistry];
}
}
// Nothing to add below since the caller provided the message (and added it).
nsValue = nil;
break;
}
} // switch
if (nsValue) {
if (isRepeated) {
[messageToGetExtension addExtension:extension value:nsValue];
} else {
[messageToGetExtension setExtension:extension value:nsValue];
}
[nsValue release];
}
}
static void ExtensionMergeFromInputStream(GPBExtensionDescriptor *extension, BOOL isPackedOnStream,
GPBCodedInputStream *input,
id<GPBExtensionRegistry> extensionRegistry,
GPBMessage *message) {
GPBExtensionDescription *description = extension->description_;
GPBCodedInputStreamState *state = &input->state_;
if (isPackedOnStream) {
#if defined(DEBUG) && DEBUG && !defined(NS_BLOCK_ASSERTIONS)
NSCAssert(GPBExtensionIsRepeated(description), @"How was it packed if it isn't repeated?");
#endif
int32_t length = GPBCodedInputStreamReadInt32(state);
size_t limit = GPBCodedInputStreamPushLimit(state, length);
while (GPBCodedInputStreamBytesUntilLimit(state) > 0) {
DecodeSingleValueFromInputStream(extension, message, input, extensionRegistry,
/*isRepeated=*/YES, nil);
}
GPBCodedInputStreamPopLimit(state, limit);
} else {
BOOL isRepeated = GPBExtensionIsRepeated(description);
GPBMessage *targetMessage = nil;
if (GPBDataTypeIsMessage(description->dataType)) {
// For messages/groups create the targetMessage out here and add it to the objects graph in
// advance, that way if DecodeSingleValueFromInputStream() throw for a parsing issue, the
// object won't be leaked.
if (isRepeated) {
GPBDescriptor *descriptor = [extension.msgClass descriptor];
targetMessage = [[descriptor.messageClass alloc] init];
[message addExtension:extension value:targetMessage];
[targetMessage release];
} else {
targetMessage = [message getExistingExtension:extension];
if (!targetMessage) {
GPBDescriptor *descriptor = [extension.msgClass descriptor];
targetMessage = [[descriptor.messageClass alloc] init];
[message setExtension:extension value:targetMessage];
[targetMessage release];
}
}
}
DecodeSingleValueFromInputStream(extension, message, input, extensionRegistry, isRepeated,
targetMessage);
}
}
static GPBMessage *GPBCreateMessageWithAutocreator(Class msgClass, GPBMessage *autocreator,
GPBFieldDescriptor *field) {
GPBMessage *message = [[msgClass alloc] init];
message->autocreator_ = autocreator;
message->autocreatorField_ = [field retain];
return message;
}
static GPBMessage *CreateMessageWithAutocreatorForExtension(Class msgClass, GPBMessage *autocreator,
GPBExtensionDescriptor *extension)
__attribute__((ns_returns_retained));
static GPBMessage *CreateMessageWithAutocreatorForExtension(Class msgClass, GPBMessage *autocreator,
GPBExtensionDescriptor *extension) {
GPBMessage *message = [[msgClass alloc] init];
message->autocreator_ = autocreator;
message->autocreatorExtension_ = [extension retain];
return message;
}
BOOL GPBWasMessageAutocreatedBy(GPBMessage *message, GPBMessage *parent) {
return (message->autocreator_ == parent);
}
void GPBBecomeVisibleToAutocreator(GPBMessage *self) {
// Message objects that are implicitly created by accessing a message field
// are initially not visible via the hasX selector. This method makes them
// visible.
if (self->autocreator_) {
// This will recursively make all parent messages visible until it reaches a
// super-creator that's visible.
if (self->autocreatorField_) {
GPBSetObjectIvarWithFieldPrivate(self->autocreator_, self->autocreatorField_, self);
} else {
[self->autocreator_ setExtension:self->autocreatorExtension_ value:self];
}
}
}
void GPBAutocreatedArrayModified(GPBMessage *self, id array) {
// When one of our autocreated arrays adds elements, make it visible.
GPBDescriptor *descriptor = [[self class] descriptor];
for (GPBFieldDescriptor *field in descriptor->fields_) {
if (field.fieldType == GPBFieldTypeRepeated) {
id curArray = GPBGetObjectIvarWithFieldNoAutocreate(self, field);
if (curArray == array) {
if (GPBFieldDataTypeIsObject(field)) {
GPBAutocreatedArray *autoArray = array;
autoArray->_autocreator = nil;
} else {
GPBInt32Array *gpbArray = array;
gpbArray->_autocreator = nil;
}
GPBBecomeVisibleToAutocreator(self);
return;
}
}
}
NSCAssert(NO, @"Unknown autocreated %@ for %@.", [array class], self);
}
void GPBAutocreatedDictionaryModified(GPBMessage *self, id dictionary) {
// When one of our autocreated dicts adds elements, make it visible.
GPBDescriptor *descriptor = [[self class] descriptor];
for (GPBFieldDescriptor *field in descriptor->fields_) {
if (field.fieldType == GPBFieldTypeMap) {
id curDict = GPBGetObjectIvarWithFieldNoAutocreate(self, field);
if (curDict == dictionary) {
if ((field.mapKeyDataType == GPBDataTypeString) && GPBFieldDataTypeIsObject(field)) {
GPBAutocreatedDictionary *autoDict = dictionary;
autoDict->_autocreator = nil;
} else {
GPBInt32Int32Dictionary *gpbDict = dictionary;
gpbDict->_autocreator = nil;
}
GPBBecomeVisibleToAutocreator(self);
return;
}
}
}
NSCAssert(NO, @"Unknown autocreated %@ for %@.", [dictionary class], self);
}
void GPBClearMessageAutocreator(GPBMessage *self) {
if ((self == nil) || !self->autocreator_) {
return;
}
#if defined(DEBUG) && DEBUG && !defined(NS_BLOCK_ASSERTIONS)
// Either the autocreator must have its "has" flag set to YES, or it must be
// NO and not equal to ourselves.
BOOL autocreatorHas =
(self->autocreatorField_ ? GPBGetHasIvarField(self->autocreator_, self->autocreatorField_)
: [self->autocreator_ hasExtension:self->autocreatorExtension_]);
GPBMessage *autocreatorFieldValue =
(self->autocreatorField_
? GPBGetObjectIvarWithFieldNoAutocreate(self->autocreator_, self->autocreatorField_)
: [self->autocreator_->autocreatedExtensionMap_
objectForKey:self->autocreatorExtension_]);
NSCAssert(autocreatorHas || autocreatorFieldValue != self,
@"Cannot clear autocreator because it still refers to self, self: %@.", self);
#endif // DEBUG && !defined(NS_BLOCK_ASSERTIONS)
self->autocreator_ = nil;
[self->autocreatorField_ release];
self->autocreatorField_ = nil;
[self->autocreatorExtension_ release];
self->autocreatorExtension_ = nil;
}
static GPBUnknownFieldSet *GetOrMakeUnknownFields(GPBMessage *self) {
if (!self->unknownFields_) {
self->unknownFields_ = [[GPBUnknownFieldSet alloc] init];
GPBBecomeVisibleToAutocreator(self);
}
return self->unknownFields_;
}
@implementation GPBMessage
+ (void)initialize {
Class pbMessageClass = [GPBMessage class];
if ([self class] == pbMessageClass) {
// This is here to start up the "base" class descriptor.
[self descriptor];
// Message shares extension method resolving with GPBRootObject so insure
// it is started up at the same time.
(void)[GPBRootObject class];
} else if ([self superclass] == pbMessageClass) {
// This is here to start up all the "message" subclasses. Just needs to be
// done for the messages, not any of the subclasses.
// This must be done in initialize to enforce thread safety of start up of
// the protocol buffer library.
// Note: The generated code for -descriptor calls
// +[GPBDescriptor allocDescriptorForClass:...], passing the GPBRootObject
// subclass for the file. That call chain is what ensures that *Root class
// is started up to support extension resolution off the message class
// (+resolveClassMethod: below) in a thread safe manner.
[self descriptor];
}
}
+ (instancetype)allocWithZone:(NSZone *)zone {
// Override alloc to allocate our classes with the additional storage
// required for the instance variables.
GPBDescriptor *descriptor = [self descriptor];
return NSAllocateObject(self, descriptor->storageSize_, zone);
}
+ (instancetype)alloc {
return [self allocWithZone:nil];
}
+ (GPBDescriptor *)descriptor {
// This is thread safe because it is called from +initialize.
static GPBDescriptor *descriptor = NULL;
static GPBFileDescriptor *fileDescriptor = NULL;
if (!descriptor) {
fileDescriptor = [[GPBFileDescriptor alloc] initWithPackage:@"internal"
syntax:GPBFileSyntaxProto2];
descriptor = [GPBDescriptor allocDescriptorForClass:[GPBMessage class]
rootClass:Nil
file:fileDescriptor
fields:NULL
fieldCount:0
storageSize:0
flags:0];
}
return descriptor;
}
+ (instancetype)message {
return [[[self alloc] init] autorelease];
}
- (instancetype)init {
if ((self = [super init])) {
messageStorage_ =
(GPBMessage_StoragePtr)(((uint8_t *)self) + class_getInstanceSize([self class]));
readOnlyLock_ = OS_UNFAIR_LOCK_INIT;
}
return self;
}
- (instancetype)initWithData:(NSData *)data error:(NSError **)errorPtr {