1 /* ----------------------------------------------------------------------------
2 * $Id: ClosureMacros.h,v 1.5 1999/03/02 19:44:08 sof Exp $
4 * (c) The GHC Team, 1998-1999
6 * Macros for building and manipulating closures
8 * -------------------------------------------------------------------------- */
10 #ifndef CLOSUREMACROS_H
11 #define CLOSUREMACROS_H
13 /* -----------------------------------------------------------------------------
16 The compiler tries to abstract away from the actual value of this
18 -------------------------------------------------------------------------- */
20 #define _FHS sizeof(StgHeader)
22 /* -----------------------------------------------------------------------------
23 Info tables are slammed up against the entry code, and the label
24 for the info table is at the *end* of the table itself. This
25 inline function adjusts an info pointer to point to the beginning
26 of the table, so we can use standard C structure indexing on it.
28 Note: this works for SRT info tables as long as you don't want to
29 access the SRT, since they are laid out the same with the SRT
30 pointer as the first word in the table.
32 NOTES ABOUT MANGLED C VS. MINI-INTERPRETER:
34 A couple of definitions:
36 "info pointer" The first word of the closure. Might point
37 to either the end or the beginning of the
38 info table, depending on whether we're using
39 the mini interpretter or not. GET_INFO(c)
40 retrieves the info pointer of a closure.
42 "info table" The info table structure associated with a
43 closure. This is always a pointer to the
44 beginning of the structure, so we can
45 use standard C structure indexing to pull out
46 the fields. get_itbl(c) returns a pointer to
47 the info table for closure c.
49 An address of the form xxxx_info points to the end of the info
50 table or the beginning of the info table depending on whether we're
51 mangling or not respectively. So,
53 c->header.info = xxx_info
55 makes absolute sense, whether mangling or not.
57 -------------------------------------------------------------------------- */
59 #define INIT_INFO(i) info : &(i)
60 #define SET_INFO(c,i) ((c)->header.info = (i))
61 #define GET_INFO(c) ((c)->header.info)
63 #if USE_MINIINTERPRETER
64 #define INIT_ENTRY(e) entry : (F_)(e)
65 #define GET_ENTRY(c) ((c)->header.info->entry)
66 #define ENTRY_CODE(info) (stgCast(StgInfoTable*,info)->entry)
67 #define INFO_PTR_TO_STRUCT(info) (info)
68 #define get_itbl(c) ((c)->header.info)
69 static __inline__ StgFunPtr get_entry(const StgInfoTable *itbl) {
73 #define INIT_ENTRY(e) code : {}
74 #define GET_ENTRY(c) stgCast(StgFunPtr,((c)->header.info))
75 #define ENTRY_CODE(info) (info)
76 #define INFO_PTR_TO_STRUCT(info) (stgCast(StgInfoTable*,info) - 1)
77 #define get_itbl(c) (stgCast(StgInfoTable*,(c)->header.info) -1)
78 static __inline__ StgFunPtr get_entry(const StgInfoTable *itbl) {
79 return stgCast(StgFunPtr,itbl+1);
83 /* -----------------------------------------------------------------------------
84 Macros for distinguishing data pointers from code pointers
85 -------------------------------------------------------------------------- */
87 * We use some symbols inserted automatically by the linker to decide
88 * whether a pointer points to text, data, or user space. These tests
89 * assume that text is lower in the address space than data, which in
90 * turn is lower than user allocated memory.
92 * If this assumption is false (say on some strange architecture) then
93 * the tests IS_CODE_PTR and IS_DATA_PTR below will need to be
94 * modified (and that should be all that's necessary).
96 * _start } start of read-only text space
97 * _etext } end of read-only text space
98 * _end } end of read-write data space
101 extern StgFun TEXT_SECTION_END_MARKER_DECL;
102 extern StgFun DATA_SECTION_END_MARKER_DECL;
104 #define IS_CODE_PTR(p) ((P_)(p) < (P_)&TEXT_SECTION_END_MARKER)
105 #define IS_DATA_PTR(p) ((P_)(p) >= (P_)&TEXT_SECTION_END_MARKER && (P_)(p) < (P_)&DATA_SECTION_END_MARKER)
106 #define IS_USER_PTR(p) ((P_)(p) >= (P_)&DATA_SECTION_END_MARKER)
108 #ifdef HAVE_WIN32_DLL_SUPPORT
110 extern char* base_non_committed;
111 #define HEAP_ALLOCED(x) (((char*)(x) >= base_non_committed) && ((char*)(x) <= (base_non_committed + 128 * 1024 * 1024)))
114 #ifndef HAVE_WIN32_DLL_SUPPORT
115 #define LOOKS_LIKE_STATIC(r) IS_DATA_PTR(r)
117 /* Static closures are 'identified' by being prefixed with a zero. This is
118 so that they can be distinguished from pointers to info tables. Relies
119 on the fact that info tables are reversed.
121 LOOKS_LIKE_STATIC_CLOSURE() - discriminates between static closures and info tbls
122 (needed by LOOKS_LIKE_GHC_INFO() below - [Win32 DLLs only.])
123 LOOKS_LIKE_STATIC() - distinguishes between static and heap allocated data.
125 #define LOOKS_LIKE_STATIC(r) (!(HEAP_ALLOCED(r)))
126 #define LOOKS_LIKE_STATIC_CLOSURE(r) ((*(((unsigned long *)(r))-1)) == 0)
130 /* -----------------------------------------------------------------------------
131 Macros for distinguishing infotables from closures.
133 You'd think it'd be easy to tell an info pointer from a closure pointer:
134 closures live on the heap and infotables are in read only memory. Right?
135 Wrong! Static closures live in read only memory and Hugs allocates
136 infotables for constructors on the (writable) C heap.
138 ToDo: in the combined Hugs-GHC system, the following are but crude
139 approximations. This absolutely has to be fixed.
140 -------------------------------------------------------------------------- */
142 #ifdef USE_MINIINTERPRETER
143 /* yoiks: one of the dreaded pointer equality tests */
144 #define IS_HUGS_CONSTR_INFO(info) (stgCast(StgInfoTable*,info)->entry == stgCast(StgFunPtr,&Hugs_CONSTR_entry))
146 #define IS_HUGS_CONSTR_INFO(info) 0 /* ToDo: more than mildly bogus */
149 #ifdef USE_MINIINTERPRETER
150 /* in the mininterpreter, we put infotables on closures */
151 #define LOOKS_LIKE_GHC_INFO(info) IS_CODE_PTR(info)
153 /* otherwise we have entry pointers on closures */
154 # ifdef HAVE_WIN32_DLL_SUPPORT
155 # define LOOKS_LIKE_GHC_INFO(info) (!HEAP_ALLOCED(info) && !LOOKS_LIKE_STATIC_CLOSURE(info))
157 # define LOOKS_LIKE_GHC_INFO(info) IS_CODE_PTR(info)
161 /* -----------------------------------------------------------------------------
162 Macros for calculating how big a closure will be (used during allocation)
163 -------------------------------------------------------------------------- */
165 /* ToDo: replace unsigned int by nat. The only fly in the ointment is that
166 * nat comes from Rts.h which many folk dont include. Sigh!
168 static __inline__ StgOffset AP_sizeW ( unsigned int n_args )
169 { return sizeofW(StgAP_UPD) + n_args; }
171 static __inline__ StgOffset PAP_sizeW ( unsigned int n_args )
172 { return sizeofW(StgPAP) + n_args; }
174 static __inline__ StgOffset CONSTR_sizeW( unsigned int p, unsigned int np )
175 { return sizeofW(StgHeader) + p + np; }
177 static __inline__ StgOffset BCO_sizeW ( unsigned int p, unsigned int np, unsigned int is )
178 { return sizeofW(StgBCO) + p + np + (is+sizeof(StgWord)-1)/sizeof(StgWord); }
180 static __inline__ StgOffset THUNK_SELECTOR_sizeW ( void )
181 { return sizeofW(StgHeader) + MIN_UPD_SIZE; }
183 static __inline__ StgOffset BLACKHOLE_sizeW ( void )
184 { return sizeofW(StgHeader) + MIN_UPD_SIZE; }
186 static __inline__ StgOffset CAF_sizeW ( void )
187 { return sizeofW(StgCAF); }
189 /* --------------------------------------------------------------------------
191 * ------------------------------------------------------------------------*/
193 static __inline__ StgOffset size_fromITBL( const StgInfoTable* itbl )
194 { return sizeof(StgClosure)
195 + sizeof(StgPtr) * itbl->layout.payload.ptrs
196 + sizeof(StgWord) * itbl->layout.payload.nptrs; }
198 static __inline__ StgOffset sizeW_fromITBL( const StgInfoTable* itbl )
199 { return sizeofW(StgClosure)
200 + sizeofW(StgPtr) * itbl->layout.payload.ptrs
201 + sizeofW(StgWord) * itbl->layout.payload.nptrs; }
203 static __inline__ StgOffset pap_size( StgPAP* x )
204 { return sizeof(StgPAP)
205 + sizeof(StgWord) * x->n_args; }
207 static __inline__ StgOffset pap_sizeW( StgPAP* x )
208 { return PAP_sizeW(x->n_args); }
210 /* These two functions give the same result - but have slightly
213 static __inline__ StgOffset arr_words_sizeW( StgArrWords* x )
214 { return sizeofW(StgArrWords) + x->words; }
215 static __inline__ StgOffset mut_arr_ptrs_sizeW( StgMutArrPtrs* x )
216 { return sizeofW(StgMutArrPtrs) + x->ptrs; }
218 static __inline__ StgWord bco_sizeW( StgBCO* bco )
219 { return BCO_sizeW(bco->n_ptrs,bco->n_words,bco->n_instrs); }
221 static __inline__ StgWord tso_sizeW ( StgTSO *tso )
222 { return TSO_STRUCT_SIZEW + tso->stack_size; }
224 /* -----------------------------------------------------------------------------
225 Macros for building closures
226 -------------------------------------------------------------------------- */
229 #define SET_PROF_HDR(c,ccs_) (c)->header.prof.ccs = ccs_
230 #define SET_STATIC_PROF_HDR(ccs_) prof : { ccs : ccs_ },
232 #define SET_PROF_HDR(c,ccs)
233 #define SET_STATIC_PROF_HDR(ccs)
237 #define SET_GRAN_HDR(c,pe) (c)->header.gran.procs = pe
238 #define SET_STATIC_GRAN_HDR gran : { procs : Everywhere },
240 #define SET_GRAN_HDR(c,pe)
241 #define SET_STATIC_GRAN_HDR
244 /* there is no PAR header, as far as I can tell -- SDM */
247 #define SET_PAR_HDR(c,stuff)
248 #define SET_STATIC_PAR_HDR(stuff)
250 #define SET_PAR_HDR(c,stuff)
251 #define SET_STATIC_PAR_HDR(stuff)
255 #define SET_TICKY_HDR(c,stuff) (c)->header.ticky.updated = stuff
256 #define SET_STATIC_TICKY_HDR(stuff) ticky : { updated : stuff }
258 #define SET_TICKY_HDR(c,stuff)
259 #define SET_STATIC_TICKY_HDR(stuff)
261 #define SET_HDR(c,info,ccs) \
264 SET_GRAN_HDR((StgClosure *)(c),ThisPE); \
265 SET_PAR_HDR((StgClosure *)(c),LOCAL_GA); \
266 SET_PROF_HDR((StgClosure *)(c),ccs); \
267 SET_TICKY_HDR((StgClosure *)(c),0); \
270 #define SET_ARR_HDR(c,info,costCentreStack,n_words) \
271 SET_HDR(c,info,costCentreStack); \
272 (c)->words = n_words;
274 /* -----------------------------------------------------------------------------
275 Static closures are defined as follows:
278 SET_STATIC_HDR(PrelBase_CZh_closure,PrelBase_CZh_info,costCentreStack,const);
280 The info argument must have type 'StgInfoTable' or
281 'StgSRTInfoTable', since we use '&' to get its address in the macro.
282 -------------------------------------------------------------------------- */
284 #define SET_STATIC_HDR(label,info,costCentreStack,closure_class,info_class) \
286 closure_class StgClosure label = { \
287 STATIC_HDR(info,costCentreStack)
289 #define STATIC_HDR(info,ccs) \
292 SET_STATIC_GRAN_HDR \
293 SET_STATIC_PAR_HDR(LOCAL_GA) \
294 SET_STATIC_PROF_HDR(ccs) \
295 SET_STATIC_TICKY_HDR(0) \
298 /* how to get hold of the static link field for a static closure.
300 * Note that we have to use (*cast(T*,&e)) instead of cast(T,e)
301 * because C won't let us take the address of a casted expression. Huh?
303 #define STATIC_LINK(info,p) \
304 (*stgCast(StgClosure**,&((p)->payload[info->layout.payload.ptrs + \
305 info->layout.payload.nptrs])))
306 #define STATIC_LINK2(info,p) \
307 (*stgCast(StgClosure**,&((p)->payload[info->layout.payload.ptrs + \
308 info->layout.payload.nptrs + 1])))
310 /* -----------------------------------------------------------------------------
311 INTLIKE and CHARLIKE closures.
312 -------------------------------------------------------------------------- */
314 #define CHARLIKE_CLOSURE(n) ((P_)&CHARLIKE_closure[n])
315 #define INTLIKE_CLOSURE(n) ((P_)&INTLIKE_closure[(n)-MIN_INTLIKE])
317 /* -----------------------------------------------------------------------------
319 -------------------------------------------------------------------------- */
321 #define payloadPtr( c, i ) (*stgCast(StgPtr*, ((c)->payload+(i))))
322 #define payloadCPtr( c, i ) (*stgCast(StgClosure**, ((c)->payload+(i))))
323 #define payloadWord( c, i ) (*stgCast(StgWord*, ((c)->payload+(i))))
325 /* -----------------------------------------------------------------------------
327 -------------------------------------------------------------------------- */
329 /* constructors don't have SRTs */
330 #define GET_TAG(info) (INFO_PTR_TO_STRUCT(info)->srt_len)
332 /* -----------------------------------------------------------------------------
334 -------------------------------------------------------------------------- */
336 #define bcoConstPtr( bco, i ) (*stgCast(StgPtr*, ((bco)->payload+(i))))
337 #define bcoConstCPtr( bco, i ) (*stgCast(StgClosurePtr*,((bco)->payload+(i))))
338 #define bcoConstInfoPtr( bco, i )(*stgCast(StgInfoTable**,((bco)->payload+(bco)->n_ptrs+i)))
339 #define bcoConstInt( bco, i ) (*stgCast(StgInt*, ((bco)->payload+(bco)->n_ptrs+i)))
340 #define bcoConstInt64( bco, i ) (PK_Int64(stgCast(StgWord*,(bco)->payload+(bco)->n_ptrs+i)))
341 #define bcoConstWord( bco, i ) (*stgCast(StgWord*, ((bco)->payload+(bco)->n_ptrs+i)))
342 #define bcoConstAddr( bco, i ) (*stgCast(StgAddr*, ((bco)->payload+(bco)->n_ptrs+i)))
343 #define bcoConstChar( bco, i ) (*stgCast(StgChar*, ((bco)->payload+(bco)->n_ptrs+i)))
344 #define bcoConstFloat( bco, i ) (PK_FLT(stgCast(StgWord*,(bco)->payload+(bco)->n_ptrs+i)))
345 #define bcoConstDouble( bco, i ) (PK_DBL(stgCast(StgWord*,(bco)->payload+(bco)->n_ptrs+i)))
346 #define bcoInstr( bco, i ) (stgCast(StgWord8*, ((bco)->payload+(bco)->n_ptrs+(bco)->n_words))[i])
348 #endif /* CLOSUREMACROS_H */