1 /* -----------------------------------------------------------------------------
2 * $Id: PrimOps.h,v 1.99 2002/10/22 11:01:18 simonmar Exp $
4 * (c) The GHC Team, 1998-2000
6 * Macros for primitive operations in STG-ish C code.
8 * ---------------------------------------------------------------------------*/
10 /* As of 5 Dec 01, this file no longer implements the primops, since they are
11 translated into standard C in compiler/absCSyn/AbsCUtils during the absC
12 flattening pass. Only {add,sub,mul}IntCzh remain untranslated. Most of
13 what is here is now EXTFUN_RTS declarations for the out-of-line primop
14 implementations which live in compiler/rts/PrimOps.hc.
22 #if WORD_SIZE_IN_BITS < 32
23 #error GHC C backend requires 32+-bit words
27 /* -----------------------------------------------------------------------------
28 * Int operations with carry.
29 * -------------------------------------------------------------------------- */
31 /* Multiply with overflow checking.
33 * This is tricky - the usual sign rules for add/subtract don't apply.
35 * On 32-bit machines we use gcc's 'long long' types, finding
36 * overflow with some careful bit-twiddling.
38 * On 64-bit machines where gcc's 'long long' type is also 64-bits,
39 * we use a crude approximation, testing whether either operand is
40 * larger than 32-bits; if neither is, then we go ahead with the
43 * Return non-zero if there is any possibility that the signed multiply
44 * of a and b might overflow. Return zero only if you are absolutely sure
45 * that it won't overflow. If in doubt, return non-zero.
48 #if SIZEOF_VOID_P == 4
50 #ifdef WORDS_BIGENDIAN
51 #define RTS_CARRY_IDX__ 0
52 #define RTS_REM_IDX__ 1
54 #define RTS_CARRY_IDX__ 1
55 #define RTS_REM_IDX__ 0
63 #define mulIntMayOflo(a,b) \
67 z.l = (StgInt64)a * (StgInt64)b; \
68 r = z.i[RTS_REM_IDX__]; \
69 c = z.i[RTS_CARRY_IDX__]; \
70 if (c == 0 || c == -1) { \
71 c = ((StgWord)((a^b) ^ r)) \
72 >> (BITS_IN (I_) - 1); \
77 /* Careful: the carry calculation above is extremely delicate. Make sure
78 * you test it thoroughly after changing it.
83 #define HALF_INT (((I_)1) << (BITS_IN (I_) / 2))
85 #define stg_abs(a) (((I_)(a)) < 0 ? -((I_)(a)) : ((I_)(a)))
87 #define mulIntMayOflo(a,b) \
90 if (stg_abs(a) >= HALF_INT || \
91 stg_abs(b) >= HALF_INT) { \
101 /* -----------------------------------------------------------------------------
103 -------------------------------------------------------------------------- */
105 /* NOTE: gcdIntzh and gcdIntegerIntzh work only for positive inputs! */
107 /* Some of these are out-of-line: -------- */
109 /* Integer arithmetic */
110 EXTFUN_RTS(plusIntegerzh_fast);
111 EXTFUN_RTS(minusIntegerzh_fast);
112 EXTFUN_RTS(timesIntegerzh_fast);
113 EXTFUN_RTS(gcdIntegerzh_fast);
114 EXTFUN_RTS(quotRemIntegerzh_fast);
115 EXTFUN_RTS(quotIntegerzh_fast);
116 EXTFUN_RTS(remIntegerzh_fast);
117 EXTFUN_RTS(divExactIntegerzh_fast);
118 EXTFUN_RTS(divModIntegerzh_fast);
120 EXTFUN_RTS(cmpIntegerIntzh_fast);
121 EXTFUN_RTS(cmpIntegerzh_fast);
122 EXTFUN_RTS(integer2Intzh_fast);
123 EXTFUN_RTS(integer2Wordzh_fast);
124 EXTFUN_RTS(gcdIntegerIntzh_fast);
125 EXTFUN_RTS(gcdIntzh_fast);
128 EXTFUN_RTS(int2Integerzh_fast);
129 EXTFUN_RTS(word2Integerzh_fast);
131 /* Floating-point decodings */
132 EXTFUN_RTS(decodeFloatzh_fast);
133 EXTFUN_RTS(decodeDoublezh_fast);
136 EXTFUN_RTS(andIntegerzh_fast);
137 EXTFUN_RTS(orIntegerzh_fast);
138 EXTFUN_RTS(xorIntegerzh_fast);
139 EXTFUN_RTS(complementIntegerzh_fast);
142 /* -----------------------------------------------------------------------------
144 -------------------------------------------------------------------------- */
146 #ifdef SUPPORT_LONG_LONGS
149 EXTFUN_RTS(int64ToIntegerzh_fast);
150 EXTFUN_RTS(word64ToIntegerzh_fast);
154 /* -----------------------------------------------------------------------------
156 -------------------------------------------------------------------------- */
158 /* We cast to void* instead of StgChar* because this avoids a warning
159 * about increasing the alignment requirements.
161 #define REAL_BYTE_ARR_CTS(a) ((void *) (((StgArrWords *)(a))->payload))
162 #define REAL_PTRS_ARR_CTS(a) ((P_) (((StgMutArrPtrs *)(a))->payload))
165 #define BYTE_ARR_CTS(a) \
166 ({ ASSERT(GET_INFO((StgArrWords *)(a)) == &stg_ARR_WORDS_info); \
167 REAL_BYTE_ARR_CTS(a); })
168 #define PTRS_ARR_CTS(a) \
169 ({ ASSERT((GET_INFO((StgMutArrPtrs *)(a)) == &stg_MUT_ARR_PTRS_FROZEN_info) \
170 || (GET_INFO((StgMutArrPtrs *)(a)) == &stg_MUT_ARR_PTRS_info)); \
171 REAL_PTRS_ARR_CTS(a); })
173 #define BYTE_ARR_CTS(a) REAL_BYTE_ARR_CTS(a)
174 #define PTRS_ARR_CTS(a) REAL_PTRS_ARR_CTS(a)
178 extern I_ genSymZh(void);
179 extern I_ resetGenSymZh(void);
181 /*--- Almost everything in line. */
183 EXTFUN_RTS(unsafeThawArrayzh_fast);
184 EXTFUN_RTS(newByteArrayzh_fast);
185 EXTFUN_RTS(newPinnedByteArrayzh_fast);
186 EXTFUN_RTS(newArrayzh_fast);
188 /* The decode operations are out-of-line because they need to allocate
192 /* We only support IEEE floating point formats. */
193 #include "ieee-flpt.h"
194 EXTFUN_RTS(decodeFloatzh_fast);
195 EXTFUN_RTS(decodeDoublezh_fast);
197 /* grimy low-level support functions defined in StgPrimFloat.c */
198 extern StgDouble __encodeDouble (I_ size, StgByteArray arr, I_ e);
199 extern StgDouble __int_encodeDouble (I_ j, I_ e);
200 extern StgFloat __encodeFloat (I_ size, StgByteArray arr, I_ e);
201 extern StgFloat __int_encodeFloat (I_ j, I_ e);
202 extern void __decodeDouble (MP_INT *man, I_ *_exp, StgDouble dbl);
203 extern void __decodeFloat (MP_INT *man, I_ *_exp, StgFloat flt);
204 extern StgInt isDoubleNaN(StgDouble d);
205 extern StgInt isDoubleInfinite(StgDouble d);
206 extern StgInt isDoubleDenormalized(StgDouble d);
207 extern StgInt isDoubleNegativeZero(StgDouble d);
208 extern StgInt isFloatNaN(StgFloat f);
209 extern StgInt isFloatInfinite(StgFloat f);
210 extern StgInt isFloatDenormalized(StgFloat f);
211 extern StgInt isFloatNegativeZero(StgFloat f);
214 /* -----------------------------------------------------------------------------
217 newMutVar is out of line.
218 -------------------------------------------------------------------------- */
220 EXTFUN_RTS(newMutVarzh_fast);
221 EXTFUN_RTS(atomicModifyMutVarzh_fast);
223 /* -----------------------------------------------------------------------------
226 All out of line, because they either allocate or may block.
227 -------------------------------------------------------------------------- */
229 EXTFUN_RTS(isEmptyMVarzh_fast);
230 EXTFUN_RTS(newMVarzh_fast);
231 EXTFUN_RTS(takeMVarzh_fast);
232 EXTFUN_RTS(putMVarzh_fast);
233 EXTFUN_RTS(tryTakeMVarzh_fast);
234 EXTFUN_RTS(tryPutMVarzh_fast);
237 /* -----------------------------------------------------------------------------
239 -------------------------------------------------------------------------- */
241 EXTFUN_RTS(waitReadzh_fast);
242 EXTFUN_RTS(waitWritezh_fast);
243 EXTFUN_RTS(delayzh_fast);
246 /* -----------------------------------------------------------------------------
247 Primitive I/O, error-handling PrimOps
248 -------------------------------------------------------------------------- */
250 EXTFUN_RTS(catchzh_fast);
251 EXTFUN_RTS(raisezh_fast);
253 extern void stg_exit(I_ n) __attribute__ ((noreturn));
256 /* -----------------------------------------------------------------------------
257 Stable Name / Stable Pointer PrimOps
258 -------------------------------------------------------------------------- */
260 EXTFUN_RTS(makeStableNamezh_fast);
261 EXTFUN_RTS(makeStablePtrzh_fast);
262 EXTFUN_RTS(deRefStablePtrzh_fast);
265 /* -----------------------------------------------------------------------------
266 Concurrency/Exception PrimOps.
267 -------------------------------------------------------------------------- */
269 EXTFUN_RTS(forkzh_fast);
270 EXTFUN_RTS(forkProcesszh_fast);
271 EXTFUN_RTS(yieldzh_fast);
272 EXTFUN_RTS(killThreadzh_fast);
273 EXTFUN_RTS(seqzh_fast);
274 EXTFUN_RTS(blockAsyncExceptionszh_fast);
275 EXTFUN_RTS(unblockAsyncExceptionszh_fast);
276 EXTFUN_RTS(myThreadIdzh_fast);
277 EXTFUN_RTS(labelThreadzh_fast);
279 extern int cmp_thread(StgPtr tso1, StgPtr tso2);
280 extern int rts_getThreadId(StgPtr tso);
282 /* -----------------------------------------------------------------------------
283 Weak Pointer PrimOps.
284 -------------------------------------------------------------------------- */
286 EXTFUN_RTS(mkWeakzh_fast);
287 EXTFUN_RTS(finalizzeWeakzh_fast);
288 EXTFUN_RTS(deRefWeakzh_fast);
291 /* -----------------------------------------------------------------------------
292 Foreign Object PrimOps.
293 -------------------------------------------------------------------------- */
295 EXTFUN_RTS(mkForeignObjzh_fast);
298 /* -----------------------------------------------------------------------------
300 -------------------------------------------------------------------------- */
303 * This macro is only used when compiling unregisterised code (see
304 * AbsCUtils.dsCOpStmt for motivation & the Story).
306 #ifndef TABLES_NEXT_TO_CODE
307 # define dataToTagzh(r,a) r=(GET_TAG(((StgClosure *)a)->header.info))
310 /* -----------------------------------------------------------------------------
312 -------------------------------------------------------------------------- */
314 EXTFUN_RTS(newBCOzh_fast);
315 EXTFUN_RTS(mkApUpd0zh_fast);
317 /* ------------------------------------------------------------------------
320 A par in the Haskell code is ultimately translated to a parzh macro
321 (with a case wrapped around it to guarantee that the macro is actually
322 executed; see compiler/prelude/PrimOps.lhs)
323 In GUM and SMP we only add a pointer to the spark pool.
324 In GranSim we call an RTS fct, forwarding additional parameters which
325 supply info on granularity of the computation, size of the result value
326 and the degree of parallelism in the sparked expression.
327 ---------------------------------------------------------------------- */
331 #define parzh(r,node) parAny(r,node,1,0,0,0,0,0)
334 #define parAtzh(r,node,where,identifier,gran_info,size_info,par_info,rest) \
335 parAT(r,node,where,identifier,gran_info,size_info,par_info,rest,1)
338 #define parAtAbszh(r,node,proc,identifier,gran_info,size_info,par_info,rest) \
339 parAT(r,node,proc,identifier,gran_info,size_info,par_info,rest,2)
342 #define parAtRelzh(r,node,proc,identifier,gran_info,size_info,par_info,rest) \
343 parAT(r,node,proc,identifier,gran_info,size_info,par_info,rest,3)
345 //@cindex _parAtForNow_
346 #define parAtForNowzh(r,node,where,identifier,gran_info,size_info,par_info,rest) \
347 parAT(r,node,where,identifier,gran_info,size_info,par_info,rest,0)
349 #define parAT(r,node,where,identifier,gran_info,size_info,par_info,rest,local) \
351 if (closure_SHOULD_SPARK((StgClosure*)node)) { \
355 STGCALL6(newSpark, node,identifier,gran_info,size_info,par_info,local); \
357 case 2: p = where; /* parAtAbs means absolute PE no. expected */ \
359 case 3: p = CurrentProc+where; /* parAtRel means rel PE no. expected */\
361 default: p = where_is(where); /* parAt means closure expected */ \
364 /* update GranSim state according to this spark */ \
365 STGCALL3(GranSimSparkAtAbs, result, (I_)p, identifier); \
370 #define parLocalzh(r,node,identifier,gran_info,size_info,par_info,rest) \
371 parAny(r,node,rest,identifier,gran_info,size_info,par_info,1)
373 //@cindex _parGlobal_
374 #define parGlobalzh(r,node,identifier,gran_info,size_info,par_info,rest) \
375 parAny(r,node,rest,identifier,gran_info,size_info,par_info,0)
377 #define parAny(r,node,rest,identifier,gran_info,size_info,par_info,local) \
379 if (closure_SHOULD_SPARK((StgClosure*)node)) { \
381 result = RET_STGCALL6(rtsSpark*, newSpark, \
382 node,identifier,gran_info,size_info,par_info,local);\
383 STGCALL1(add_to_spark_queue,result); \
384 STGCALL2(GranSimSpark, local,(P_)node); \
388 #define copyablezh(r,node) \
389 /* copyable not yet implemented!! */
391 #define noFollowzh(r,node) \
392 /* noFollow not yet implemented!! */
394 #elif defined(SMP) || defined(PAR)
396 #define parzh(r,node) \
398 extern unsigned int context_switch; \
399 if (closure_SHOULD_SPARK((StgClosure *)node) && \
400 SparkTl < SparkLim) { \
401 *SparkTl++ = (StgClosure *)(node); \
403 r = context_switch = 1; \
405 #else /* !GRAN && !SMP && !PAR */
406 #define parzh(r,node) r = 1
409 /* -----------------------------------------------------------------------------
410 ForeignObj - the C backend still needs this.
411 -------------------------------------------------------------------------- */
412 #define ForeignObj_CLOSURE_DATA(c) (((StgForeignObj *)c)->data)
414 #endif /* PRIMOPS_H */