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Diffstat (limited to 'third_party/protobuf/objectivec/GPBRootObject.m')
| -rw-r--r-- | third_party/protobuf/objectivec/GPBRootObject.m | 237 |
1 files changed, 0 insertions, 237 deletions
diff --git a/third_party/protobuf/objectivec/GPBRootObject.m b/third_party/protobuf/objectivec/GPBRootObject.m deleted file mode 100644 index 585d205a21..0000000000 --- a/third_party/protobuf/objectivec/GPBRootObject.m +++ /dev/null @@ -1,237 +0,0 @@ -// 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. - -#import "GPBRootObject_PackagePrivate.h" - -#import <objc/runtime.h> - -#import <CoreFoundation/CoreFoundation.h> - -#import "GPBDescriptor.h" -#import "GPBExtensionRegistry.h" -#import "GPBUtilities_PackagePrivate.h" - -@interface GPBExtensionDescriptor (GPBRootObject) -// Get singletonName as a c string. -- (const char *)singletonNameC; -@end - -@implementation GPBRootObject - -// Taken from http://www.burtleburtle.net/bob/hash/doobs.html -// Public Domain -static uint32_t jenkins_one_at_a_time_hash(const char *key) { - uint32_t hash = 0; - for (uint32_t i = 0; key[i] != '\0'; ++i) { - hash += key[i]; - hash += (hash << 10); - hash ^= (hash >> 6); - } - hash += (hash << 3); - hash ^= (hash >> 11); - hash += (hash << 15); - return hash; -} - -// Key methods for our custom CFDictionary. -// Note that the dictionary lasts for the lifetime of our app, so no need -// to worry about deallocation. All of the items are added to it at -// startup, and so the keys don't need to be retained/released. -// Keys are NULL terminated char *. -static const void *GPBRootExtensionKeyRetain(CFAllocatorRef allocator, - const void *value) { -#pragma unused(allocator) - return value; -} - -static void GPBRootExtensionKeyRelease(CFAllocatorRef allocator, - const void *value) { -#pragma unused(allocator) -#pragma unused(value) -} - -static CFStringRef GPBRootExtensionCopyKeyDescription(const void *value) { - const char *key = (const char *)value; - return CFStringCreateWithCString(kCFAllocatorDefault, key, - kCFStringEncodingUTF8); -} - -static Boolean GPBRootExtensionKeyEqual(const void *value1, - const void *value2) { - const char *key1 = (const char *)value1; - const char *key2 = (const char *)value2; - return strcmp(key1, key2) == 0; -} - -static CFHashCode GPBRootExtensionKeyHash(const void *value) { - const char *key = (const char *)value; - return jenkins_one_at_a_time_hash(key); -} - -// NOTE: OSSpinLock may seem like a good fit here but Apple engineers have -// pointed out that they are vulnerable to live locking on iOS in cases of -// priority inversion: -// http://mjtsai.com/blog/2015/12/16/osspinlock-is-unsafe/ -// https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20151214/000372.html -static dispatch_semaphore_t gExtensionSingletonDictionarySemaphore; -static CFMutableDictionaryRef gExtensionSingletonDictionary = NULL; -static GPBExtensionRegistry *gDefaultExtensionRegistry = NULL; - -+ (void)initialize { - // Ensure the global is started up. - if (!gExtensionSingletonDictionary) { - gExtensionSingletonDictionarySemaphore = dispatch_semaphore_create(1); - CFDictionaryKeyCallBacks keyCallBacks = { - // See description above for reason for using custom dictionary. - 0, - GPBRootExtensionKeyRetain, - GPBRootExtensionKeyRelease, - GPBRootExtensionCopyKeyDescription, - GPBRootExtensionKeyEqual, - GPBRootExtensionKeyHash, - }; - gExtensionSingletonDictionary = - CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &keyCallBacks, - &kCFTypeDictionaryValueCallBacks); - gDefaultExtensionRegistry = [[GPBExtensionRegistry alloc] init]; - } - - if ([self superclass] == [GPBRootObject class]) { - // This is here to start up all the per file "Root" subclasses. - // This must be done in initialize to enforce thread safety of start up of - // the protocol buffer library. - [self extensionRegistry]; - } -} - -+ (GPBExtensionRegistry *)extensionRegistry { - // Is overridden in all the subclasses that provide extensions to provide the - // per class one. - return gDefaultExtensionRegistry; -} - -+ (void)globallyRegisterExtension:(GPBExtensionDescriptor *)field { - const char *key = [field singletonNameC]; - dispatch_semaphore_wait(gExtensionSingletonDictionarySemaphore, - DISPATCH_TIME_FOREVER); - CFDictionarySetValue(gExtensionSingletonDictionary, key, field); - dispatch_semaphore_signal(gExtensionSingletonDictionarySemaphore); -} - -static id ExtensionForName(id self, SEL _cmd) { - // Really fast way of doing "classname_selName". - // This came up as a hotspot (creation of NSString *) when accessing a - // lot of extensions. - const char *selName = sel_getName(_cmd); - if (selName[0] == '_') { - return nil; // Apple internal selector. - } - size_t selNameLen = 0; - while (1) { - char c = selName[selNameLen]; - if (c == '\0') { // String end. - break; - } - if (c == ':') { - return nil; // Selector took an arg, not one of the runtime methods. - } - ++selNameLen; - } - - const char *className = class_getName(self); - size_t classNameLen = strlen(className); - char key[classNameLen + selNameLen + 2]; - memcpy(key, className, classNameLen); - key[classNameLen] = '_'; - memcpy(&key[classNameLen + 1], selName, selNameLen); - key[classNameLen + 1 + selNameLen] = '\0'; - - // NOTE: Even though this method is called from another C function, - // gExtensionSingletonDictionarySemaphore and gExtensionSingletonDictionary - // will always be initialized. This is because this call flow is just to - // lookup the Extension, meaning the code is calling an Extension class - // message on a Message or Root class. This guarantees that the class was - // initialized and Message classes ensure their Root was also initialized. - NSAssert(gExtensionSingletonDictionary, @"Startup order broken!"); - - dispatch_semaphore_wait(gExtensionSingletonDictionarySemaphore, - DISPATCH_TIME_FOREVER); - id extension = (id)CFDictionaryGetValue(gExtensionSingletonDictionary, key); - // We can't remove the key from the dictionary here (as an optimization), - // two threads could have gone into +resolveClassMethod: for the same method, - // and ended up here; there's no way to ensure both return YES without letting - // both try to wire in the method. - dispatch_semaphore_signal(gExtensionSingletonDictionarySemaphore); - return extension; -} - -BOOL GPBResolveExtensionClassMethod(Class self, SEL sel) { - // Another option would be to register the extensions with the class at - // globallyRegisterExtension: - // Timing the two solutions, this solution turned out to be much faster - // and reduced startup time, and runtime memory. - // The advantage to globallyRegisterExtension is that it would reduce the - // size of the protos somewhat because the singletonNameC wouldn't need - // to include the class name. For a class with a lot of extensions it - // can add up. You could also significantly reduce the code complexity of this - // file. - id extension = ExtensionForName(self, sel); - if (extension != nil) { - const char *encoding = - GPBMessageEncodingForSelector(@selector(getClassValue), NO); - Class metaClass = objc_getMetaClass(class_getName(self)); - IMP imp = imp_implementationWithBlock(^(id obj) { -#pragma unused(obj) - return extension; - }); - BOOL methodAdded = class_addMethod(metaClass, sel, imp, encoding); - // class_addMethod() is documented as also failing if the method was already - // added; so we check if the method is already there and return success so - // the method dispatch will still happen. Why would it already be added? - // Two threads could cause the same method to be bound at the same time, - // but only one will actually bind it; the other still needs to return true - // so things will dispatch. - if (!methodAdded) { - methodAdded = GPBClassHasSel(metaClass, sel); - } - return methodAdded; - } - return NO; -} - - -+ (BOOL)resolveClassMethod:(SEL)sel { - if (GPBResolveExtensionClassMethod(self, sel)) { - return YES; - } - return [super resolveClassMethod:sel]; -} - -@end |