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Comparing libecb/ecb.h (file contents):
Revision 1.92 by root, Tue May 29 17:17:56 2012 UTC vs.
Revision 1.101 by root, Thu Jun 28 14:50:01 2012 UTC

… …
54 #else 54 #else
55 #define ECB_PTRSIZE 4 55 #define ECB_PTRSIZE 4
56 typedef uint32_t uintptr_t; 56 typedef uint32_t uintptr_t;
57 typedef int32_t intptr_t; 57 typedef int32_t intptr_t;
58 #endif 58 #endif
59 typedef intptr_t ptrdiff_t;
60#else 59#else
61 #include <inttypes.h> 60 #include <inttypes.h>
62 #if UINTMAX_MAX > 0xffffffffU 61 #if UINTMAX_MAX > 0xffffffffU
63 #define ECB_PTRSIZE 8 62 #define ECB_PTRSIZE 8
64 #else 63 #else
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83 82
84#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */ 83#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
85#define ECB_C99 (__STDC_VERSION__ >= 199901L) 84#define ECB_C99 (__STDC_VERSION__ >= 199901L)
86#define ECB_C11 (__STDC_VERSION__ >= 201112L) 85#define ECB_C11 (__STDC_VERSION__ >= 201112L)
87#define ECB_CPP (__cplusplus+0) 86#define ECB_CPP (__cplusplus+0)
88#define ECB_CPP98 (__cplusplus >= 199711L)
89#define ECB_CPP11 (__cplusplus >= 201103L) 87#define ECB_CPP11 (__cplusplus >= 201103L)
90 88
91/*****************************************************************************/ 89/*****************************************************************************/
92 90
93/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 91/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
94/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ 92/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
95 93
96#if ECB_NO_THREADS 94#if ECB_NO_THREADS
97# define ECB_NO_SMP 1 95 #define ECB_NO_SMP 1
98#endif 96#endif
99 97
100#if ECB_NO_THREADS || ECB_NO_SMP 98#if ECB_NO_SMP
101 #define ECB_MEMORY_FENCE do { } while (0) 99 #define ECB_MEMORY_FENCE do { } while (0)
102#endif
103
104#ifndef ECB_MEMORY_FENCE
105 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
106 /* we assume that these memory fences work on all variables/all memory accesses, */
107 /* not just C11 atomics and atomic accesses */
108 #include <stdatomic.h>
109 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_acq_rel)
110 #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
111 #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
112 #endif
113#endif
114
115#ifndef ECB_MEMORY_FENCE_RELEASE
116 #if ECB_GCC_VERSION(4,7)
117 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_ACQ_REL)
118 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
119 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
120 #endif
121#endif 100#endif
122 101
123#ifndef ECB_MEMORY_FENCE 102#ifndef ECB_MEMORY_FENCE
124 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 103 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
125 #if __i386 || __i386__ 104 #if __i386 || __i386__
126 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 105 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
127 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ 106 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
128 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ 107 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
129 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ 108 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
130 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 109 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
131 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 110 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
132 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ 111 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
133 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ 112 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
134 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 113 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
135 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ 114 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
136 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ 115 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
137 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") 116 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
138 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ 117 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
139 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ 118 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
140 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 119 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
141 #elif __sparc || __sparc__ 120 #elif __sparc || __sparc__
142 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory") 121 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
143 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 122 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
144 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 123 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
145 #elif defined __s390__ || defined __s390x__ 124 #elif defined __s390__ || defined __s390x__
146 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 125 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
147 #elif defined __mips__ 126 #elif defined __mips__
148 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 127 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
149 #elif defined __alpha__ 128 #elif defined __alpha__
150 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") 129 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
130 #elif defined __hppa__
131 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
132 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
133 #elif defined __ia64__
134 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
151 #endif 135 #endif
152 #endif 136 #endif
153#endif 137#endif
154 138
155#ifndef ECB_MEMORY_FENCE 139#ifndef ECB_MEMORY_FENCE
140 #if ECB_GCC_VERSION(4,7)
141 /* see comment below (stdatomic.h) about the C11 memory model. */
142 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
143 #elif defined __clang && __has_feature (cxx_atomic)
144 /* see comment below (stdatomic.h) about the C11 memory model. */
145 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
156 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 146 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
157 #define ECB_MEMORY_FENCE __sync_synchronize () 147 #define ECB_MEMORY_FENCE __sync_synchronize ()
158 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
159 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
160 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 148 #elif _MSC_VER >= 1400 /* VC++ 2005 */
161 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 149 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
162 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 150 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
163 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 151 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
164 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 152 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
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174 #define ECB_MEMORY_FENCE __sync () 162 #define ECB_MEMORY_FENCE __sync ()
175 #endif 163 #endif
176#endif 164#endif
177 165
178#ifndef ECB_MEMORY_FENCE 166#ifndef ECB_MEMORY_FENCE
167 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
168 /* we assume that these memory fences work on all variables/all memory accesses, */
169 /* not just C11 atomics and atomic accesses */
170 #include <stdatomic.h>
171 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
172 /* any fence other than seq_cst, which isn't very efficient for us. */
173 /* Why that is, we don't know - either the C11 memory model is quite useless */
174 /* for most usages, or gcc and clang have a bug */
175 /* I *currently* lean towards the latter, and inefficiently implement */
176 /* all three of ecb's fences as a seq_cst fence */
177 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
178 #endif
179#endif
180
181#ifndef ECB_MEMORY_FENCE
179 #if !ECB_AVOID_PTHREADS 182 #if !ECB_AVOID_PTHREADS
180 /* 183 /*
181 * if you get undefined symbol references to pthread_mutex_lock, 184 * if you get undefined symbol references to pthread_mutex_lock,
182 * or failure to find pthread.h, then you should implement 185 * or failure to find pthread.h, then you should implement
183 * the ECB_MEMORY_FENCE operations for your cpu/compiler 186 * the ECB_MEMORY_FENCE operations for your cpu/compiler
… …
455 ecb_inline void ecb_unreachable (void) ecb_noreturn; 458 ecb_inline void ecb_unreachable (void) ecb_noreturn;
456 ecb_inline void ecb_unreachable (void) { } 459 ecb_inline void ecb_unreachable (void) { }
457#endif 460#endif
458 461
459/* try to tell the compiler that some condition is definitely true */ 462/* try to tell the compiler that some condition is definitely true */
460#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 463#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
461 464
462ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; 465ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
463ecb_inline unsigned char 466ecb_inline unsigned char
464ecb_byteorder_helper (void) 467ecb_byteorder_helper (void)
465{ 468{
466 const uint32_t u = 0x11223344; 469 /* the union code still generates code under pressure in gcc, */
467 return *(unsigned char *)&u; 470 /* but less than using pointers, and always seem to */
471 /* successfully return a constant. */
472 /* the reason why we have this horrible preprocessor mess */
473 /* is to avoid it in all cases, at least on common architectures */
474 /* and yes, gcc defines __BYTE_ORDER__, g++ does not */
475#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
476 return 0x44;
477#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
478 return 0x44;
479#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
480 retrurn 0x11;
481#else
482 union
483 {
484 uint32_t i;
485 uint8_t c;
486 } u = { 0x11223344 };
487 return u.c;
488#endif
468} 489}
469 490
470ecb_inline ecb_bool ecb_big_endian (void) ecb_const; 491ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
471ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 492ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
472ecb_inline ecb_bool ecb_little_endian (void) ecb_const; 493ecb_inline ecb_bool ecb_little_endian (void) ecb_const;

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