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74 lines
2.0 KiB
Objective-C
74 lines
2.0 KiB
Objective-C
//
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// FLEXObjcInternal.h
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// FLEX
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//
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// Created by Tanner Bennett on 11/1/18.
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//
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#import <Foundation/Foundation.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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// The macros below are copied straight from
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// objc-internal.h, objc-private.h, objc-object.h, and objc-config.h with
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// as few modifications as possible. Changes are noted in boxed comments.
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// https://opensource.apple.com/source/objc4/objc4-723/
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// https://opensource.apple.com/source/objc4/objc4-723/runtime/objc-internal.h.auto.html
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// https://opensource.apple.com/source/objc4/objc4-723/runtime/objc-object.h.auto.html
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/////////////////////
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// objc-internal.h //
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/////////////////////
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#if __LP64__
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#define OBJC_HAVE_TAGGED_POINTERS 1
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#endif
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#if OBJC_HAVE_TAGGED_POINTERS
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#if TARGET_OS_OSX && __x86_64__
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// 64-bit Mac - tag bit is LSB
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# define OBJC_MSB_TAGGED_POINTERS 0
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#else
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// Everything else - tag bit is MSB
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# define OBJC_MSB_TAGGED_POINTERS 1
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#endif
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#if OBJC_MSB_TAGGED_POINTERS
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# define _OBJC_TAG_MASK (1UL<<63)
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# define _OBJC_TAG_EXT_MASK (0xfUL<<60)
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#else
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# define _OBJC_TAG_MASK 1UL
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# define _OBJC_TAG_EXT_MASK 0xfUL
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#endif
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#endif // OBJC_HAVE_TAGGED_POINTERS
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//////////////////////////////////////
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// originally _objc_isTaggedPointer //
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//////////////////////////////////////
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NS_INLINE BOOL flex_isTaggedPointer(const void *ptr) {
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#if OBJC_HAVE_TAGGED_POINTERS
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return ((uintptr_t)ptr & _OBJC_TAG_MASK) == _OBJC_TAG_MASK;
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#else
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return NO;
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#endif
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}
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#define FLEXPointerIsTaggedPointer(obj) flex_isTaggedPointer((__bridge void *)obj)
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BOOL FLEXPointerIsReadable(const void * ptr);
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/// @brief Assumes memory is valid and readable.
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/// @discussion objc-internal.h, objc-private.h, and objc-config.h
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/// https://blog.timac.org/2016/1124-testing-if-an-arbitrary-pointer-is-a-valid-objective-c-object/
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/// https://llvm.org/svn/llvm-project/lldb/trunk/examples/summaries/cocoa/objc_runtime.py
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/// https://blog.timac.org/2016/1124-testing-if-an-arbitrary-pointer-is-a-valid-objective-c-object/
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BOOL FLEXPointerIsValidObjcObject(const void * ptr);
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#ifdef __cplusplus
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}
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#endif
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