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Add NSConstantString implementation for v2 ABI.

Browse source 
This is largely the version from the newabi branch, but with a few
cleanups made possible by other bug fixes in the GSString
implementations.
This commit is contained in:
David Chisnall 2018-12-27 13:42:12 +00:00
parent 00472f14d0
commit 3847c54f3f
2 changed files with 196 additions and 0 deletions
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41
Headers/Foundation/NSString.h
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@ -881,6 +881,12 @@ typedef NSUInteger NSStringEncodingConversionOptions;
@end
#ifdef __OBJC_GNUSTEP_RUNTIME_ABI__
# if __OBJC_GNUSTEP_RUNTIME_ABI__ >= 20
# define GNUSTEP_NEW_STRING_ABI
# endif
#endif
/**
* <p>The NXConstantString class is used to hold constant 8-bit character
* string objects produced by the compiler where it sees @"..." in the
@ -908,8 +914,43 @@ typedef NSUInteger NSStringEncodingConversionOptions;
@interface NXConstantString : NSString
{
@public
#ifdef GNUSTEP_NEW_STRING_ABI
/**
* Flags. The low 16 bits are reserved for the compiler, the top 16 for use
* by the Foundation Framework. Currently only the low 2 bits are used, to
* indicate the encoding of the string, with the following values:
*
* 0. ASCII (UTF-8 using only 7-bit characters)
* 1. UTF-8
* 2. UTF-16
* 3. UTF-32
*
*/
uint32_t flags;
/**
* The number of characters (UTF-16 code units) in the string.
*/
uint32_t nxcslen;
/**
* The number of bytes in the string. For fixed-length encodings, this is a
* fixed multiple of nxcslen, but for UTF-8 it can be different.
*/
uint32_t size;
/**
* Hash value.
*/
uint32_t hash;
/**
* Pointer to the byte data of the string. Note that `char*` is the correct
* type only if the low two bits of the flags indicate that this is an ASCII
* or UTF-8 string, otherwise it is a pointer to 16- or 32-bit characters in
* native byte order.
*/
const char * const nxcsptr;
#else
const char * const nxcsptr;
const unsigned int nxcslen;
#endif
}
@end