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389 lines
13 KiB
C
389 lines
13 KiB
C
/*
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* Copyright (c) 1999-2007 Apple Inc. All Rights Reserved.
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*/
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#ifndef _OBJC_MESSAGE_H
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#define _OBJC_MESSAGE_H
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#include <objc/objc.h>
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#include <objc/runtime.h>
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#ifndef OBJC_SUPER
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#define OBJC_SUPER
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/// Specifies the superclass of an instance.
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struct objc_super {
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/// Specifies an instance of a class.
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__unsafe_unretained _Nonnull id receiver;
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/// Specifies the particular superclass of the instance to message.
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#if !defined(__cplusplus) && !__OBJC2__
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/* For compatibility with old objc-runtime.h header */
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__unsafe_unretained _Nonnull Class class;
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#else
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__unsafe_unretained _Nonnull Class super_class;
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#endif
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/* super_class is the first class to search */
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};
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#endif
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/* Basic Messaging Primitives
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*
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* On some architectures, use objc_msgSend_stret for some struct return types.
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* On some architectures, use objc_msgSend_fpret for some float return types.
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* On some architectures, use objc_msgSend_fp2ret for some float return types.
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*
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* These functions must be cast to an appropriate function pointer type
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* before being called.
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*/
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#if !OBJC_OLD_DISPATCH_PROTOTYPES
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wincompatible-library-redeclaration"
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OBJC_EXPORT void
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objc_msgSend(void /* id self, SEL op, ... */ )
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OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
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OBJC_EXPORT void
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objc_msgSendSuper(void /* struct objc_super *super, SEL op, ... */ )
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OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
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#pragma clang diagnostic pop
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#else
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/**
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* Sends a message with a simple return value to an instance of a class.
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*
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* @param self A pointer to the instance of the class that is to receive the message.
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* @param op The selector of the method that handles the message.
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* @param ...
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* A variable argument list containing the arguments to the method.
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*
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* @return The return value of the method.
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*
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* @note When it encounters a method call, the compiler generates a call to one of the
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* functions \c objc_msgSend, \c objc_msgSend_stret, \c objc_msgSendSuper, or \c objc_msgSendSuper_stret.
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* Messages sent to an object’s superclass (using the \c super keyword) are sent using \c objc_msgSendSuper;
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* other messages are sent using \c objc_msgSend. Methods that have data structures as return values
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* are sent using \c objc_msgSendSuper_stret and \c objc_msgSend_stret.
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*/
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OBJC_EXPORT id _Nullable
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objc_msgSend(id _Nullable self, SEL _Nonnull op, ...)
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OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
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/**
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* Sends a message with a simple return value to the superclass of an instance of a class.
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*
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* @param super A pointer to an \c objc_super data structure. Pass values identifying the
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* context the message was sent to, including the instance of the class that is to receive the
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* message and the superclass at which to start searching for the method implementation.
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* @param op A pointer of type SEL. Pass the selector of the method that will handle the message.
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* @param ...
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* A variable argument list containing the arguments to the method.
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*
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* @return The return value of the method identified by \e op.
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*
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* @see objc_msgSend
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*/
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OBJC_EXPORT id _Nullable
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objc_msgSendSuper(struct objc_super * _Nonnull super, SEL _Nonnull op, ...)
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OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
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#endif
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/* Struct-returning Messaging Primitives
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*
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* Use these functions to call methods that return structs on the stack.
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* On some architectures, some structures are returned in registers.
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* Consult your local function call ABI documentation for details.
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*
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* These functions must be cast to an appropriate function pointer type
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* before being called.
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*/
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#if !OBJC_OLD_DISPATCH_PROTOTYPES
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wincompatible-library-redeclaration"
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OBJC_EXPORT void
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objc_msgSend_stret(void /* id self, SEL op, ... */ )
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OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
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OBJC_ARM64_UNAVAILABLE;
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OBJC_EXPORT void
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objc_msgSendSuper_stret(void /* struct objc_super *super, SEL op, ... */ )
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OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
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OBJC_ARM64_UNAVAILABLE;
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#pragma clang diagnostic pop
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#else
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/**
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* Sends a message with a data-structure return value to an instance of a class.
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*
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* @see objc_msgSend
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*/
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OBJC_EXPORT void
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objc_msgSend_stret(id _Nullable self, SEL _Nonnull op, ...)
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OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
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OBJC_ARM64_UNAVAILABLE;
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/**
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* Sends a message with a data-structure return value to the superclass of an instance of a class.
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*
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* @see objc_msgSendSuper
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*/
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OBJC_EXPORT void
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objc_msgSendSuper_stret(struct objc_super * _Nonnull super,
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SEL _Nonnull op, ...)
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OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
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OBJC_ARM64_UNAVAILABLE;
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#endif
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/* Floating-point-returning Messaging Primitives
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*
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* Use these functions to call methods that return floating-point values
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* on the stack.
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* Consult your local function call ABI documentation for details.
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*
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* arm: objc_msgSend_fpret not used
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* i386: objc_msgSend_fpret used for `float`, `double`, `long double`.
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* x86-64: objc_msgSend_fpret used for `long double`.
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*
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* arm: objc_msgSend_fp2ret not used
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* i386: objc_msgSend_fp2ret not used
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* x86-64: objc_msgSend_fp2ret used for `_Complex long double`.
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*
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* These functions must be cast to an appropriate function pointer type
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* before being called.
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*/
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#if !OBJC_OLD_DISPATCH_PROTOTYPES
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wincompatible-library-redeclaration"
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# if defined(__i386__)
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OBJC_EXPORT void
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objc_msgSend_fpret(void /* id self, SEL op, ... */ )
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OBJC_AVAILABLE(10.4, 2.0, 9.0, 1.0, 2.0);
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# elif defined(__x86_64__)
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OBJC_EXPORT void
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objc_msgSend_fpret(void /* id self, SEL op, ... */ )
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OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
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OBJC_EXPORT void
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objc_msgSend_fp2ret(void /* id self, SEL op, ... */ )
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OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
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#pragma clang diagnostic pop
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# endif
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// !OBJC_OLD_DISPATCH_PROTOTYPES
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#else
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// OBJC_OLD_DISPATCH_PROTOTYPES
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# if defined(__i386__)
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/**
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* Sends a message with a floating-point return value to an instance of a class.
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*
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* @see objc_msgSend
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* @note On the i386 platform, the ABI for functions returning a floating-point value is
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* incompatible with that for functions returning an integral type. On the i386 platform, therefore,
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* you must use \c objc_msgSend_fpret for functions returning non-integral type. For \c float or
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* \c long \c double return types, cast the function to an appropriate function pointer type first.
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*/
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wincompatible-library-redeclaration"
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OBJC_EXPORT double
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objc_msgSend_fpret(id _Nullable self, SEL _Nonnull op, ...)
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OBJC_AVAILABLE(10.4, 2.0, 9.0, 1.0, 2.0);
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#pragma clang diagnostic pop
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/* Use objc_msgSendSuper() for fp-returning messages to super. */
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/* See also objc_msgSendv_fpret() below. */
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# elif defined(__x86_64__)
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/**
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* Sends a message with a floating-point return value to an instance of a class.
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*
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* @see objc_msgSend
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*/
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OBJC_EXPORT long double
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objc_msgSend_fpret(id _Nullable self, SEL _Nonnull op, ...)
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OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
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# if __STDC_VERSION__ >= 199901L
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OBJC_EXPORT _Complex long double
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objc_msgSend_fp2ret(id _Nullable self, SEL _Nonnull op, ...)
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OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
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# else
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OBJC_EXPORT void objc_msgSend_fp2ret(id _Nullable self, SEL _Nonnull op, ...)
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OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
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# endif
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/* Use objc_msgSendSuper() for fp-returning messages to super. */
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/* See also objc_msgSendv_fpret() below. */
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# endif
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// OBJC_OLD_DISPATCH_PROTOTYPES
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#endif
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/* Direct Method Invocation Primitives
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* Use these functions to call the implementation of a given Method.
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* This is faster than calling method_getImplementation() and method_getName().
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*
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* The receiver must not be nil.
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*
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* These functions must be cast to an appropriate function pointer type
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* before being called.
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*/
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#if !OBJC_OLD_DISPATCH_PROTOTYPES
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wincompatible-library-redeclaration"
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OBJC_EXPORT void
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method_invoke(void /* id receiver, Method m, ... */ )
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OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
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OBJC_EXPORT void
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method_invoke_stret(void /* id receiver, Method m, ... */ )
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OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0)
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OBJC_ARM64_UNAVAILABLE;
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#pragma clang diagnostic pop
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#else
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OBJC_EXPORT id _Nullable
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method_invoke(id _Nullable receiver, Method _Nonnull m, ...)
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OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
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OBJC_EXPORT void
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method_invoke_stret(id _Nullable receiver, Method _Nonnull m, ...)
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OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0)
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OBJC_ARM64_UNAVAILABLE;
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#endif
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/* Message Forwarding Primitives
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* Use these functions to forward a message as if the receiver did not
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* respond to it.
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*
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* The receiver must not be nil.
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*
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* class_getMethodImplementation() may return (IMP)_objc_msgForward.
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* class_getMethodImplementation_stret() may return (IMP)_objc_msgForward_stret
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*
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* These functions must be cast to an appropriate function pointer type
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* before being called.
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*
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* Before Mac OS X 10.6, _objc_msgForward must not be called directly
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* but may be compared to other IMP values.
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*/
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#if !OBJC_OLD_DISPATCH_PROTOTYPES
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wincompatible-library-redeclaration"
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OBJC_EXPORT void
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_objc_msgForward(void /* id receiver, SEL sel, ... */ )
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OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
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OBJC_EXPORT void
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_objc_msgForward_stret(void /* id receiver, SEL sel, ... */ )
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OBJC_AVAILABLE(10.6, 3.0, 9.0, 1.0, 2.0)
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OBJC_ARM64_UNAVAILABLE;
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#pragma clang diagnostic pop
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#else
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OBJC_EXPORT id _Nullable
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_objc_msgForward(id _Nonnull receiver, SEL _Nonnull sel, ...)
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OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
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OBJC_EXPORT void
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_objc_msgForward_stret(id _Nonnull receiver, SEL _Nonnull sel, ...)
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OBJC_AVAILABLE(10.6, 3.0, 9.0, 1.0, 2.0)
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OBJC_ARM64_UNAVAILABLE;
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#endif
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/* Variable-argument Messaging Primitives
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*
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* Use these functions to call methods with a list of arguments, such
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* as the one passed to forward:: .
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*
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* The contents of the argument list are architecture-specific.
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* Consult your local function call ABI documentation for details.
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*
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* These functions must be cast to an appropriate function pointer type
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* before being called, except for objc_msgSendv_stret() which must not
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* be cast to a struct-returning type.
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*/
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typedef void* marg_list;
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OBJC_EXPORT id _Nullable
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objc_msgSendv(id _Nullable self, SEL _Nonnull op, size_t arg_size,
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marg_list _Nonnull arg_frame)
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OBJC2_UNAVAILABLE;
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OBJC_EXPORT void
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objc_msgSendv_stret(void * _Nonnull stretAddr, id _Nullable self,
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SEL _Nonnull op, size_t arg_size,
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marg_list _Nullable arg_frame)
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OBJC2_UNAVAILABLE;
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/* Note that objc_msgSendv_stret() does not return a structure type,
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* and should not be cast to do so. This is unlike objc_msgSend_stret()
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* and objc_msgSendSuper_stret().
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*/
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#if defined(__i386__)
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OBJC_EXPORT double
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objc_msgSendv_fpret(id _Nullable self, SEL _Nonnull op,
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unsigned arg_size, marg_list _Nullable arg_frame)
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OBJC2_UNAVAILABLE;
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#endif
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/* The following marg_list macros are of marginal utility. They
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* are included for compatibility with the old objc-class.h header. */
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#if !__OBJC2__
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#define marg_prearg_size 0
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#define marg_malloc(margs, method) \
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do { \
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margs = (marg_list *)malloc (marg_prearg_size + ((7 + method_getSizeOfArguments(method)) & ~7)); \
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} while (0)
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#define marg_free(margs) \
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do { \
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free(margs); \
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} while (0)
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#define marg_adjustedOffset(method, offset) \
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(marg_prearg_size + offset)
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#define marg_getRef(margs, offset, type) \
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( (type *)((char *)margs + marg_adjustedOffset(method,offset) ) )
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#define marg_getValue(margs, offset, type) \
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( *marg_getRef(margs, offset, type) )
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#define marg_setValue(margs, offset, type, value) \
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( marg_getValue(margs, offset, type) = (value) )
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#endif
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#endif
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