1 /* ----------------------------------------------------------------------------
2 * $Id: ClosureMacros.h,v 1.7 1999/03/03 19:27:23 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
109 extern int is_heap_alloced(const void* x);
110 # define HEAP_ALLOCED(x) (is_heap_alloced(x))
112 # define HEAP_ALLOCED(x) IS_USER_PTR(x)
115 /* When working with Win32 DLLs, static closures are identified by
116 being prefixed with a zero word. This is needed so that we can
117 distinguish between pointers to static closures and (reversed!)
120 This 'scheme' breaks down for closure tables such as CHARLIKE,
121 so we catch these separately.
123 LOOKS_LIKE_STATIC_CLOSURE()
124 - discriminates between static closures and info tbls
125 (needed by LOOKS_LIKE_GHC_INFO() below - [Win32 DLLs only.])
127 - distinguishes between static and heap allocated data.
129 #ifdef HAVE_WIN32_DLL_SUPPORT
130 #define LOOKS_LIKE_STATIC(r) (!(HEAP_ALLOCED(r)))
132 /* Tiresome predicates needed to check for pointers into the closure tables */
133 #define IS_BOOL_CLOSURE(p) ( stgCast(StgPtr,p) >= stgCast(StgPtr,PrelBase_Bool_closure_tbl) && stgCast(char*,p) <= (stgCast(char*,PrelBase_Bool_closure_tbl) + 2 * sizeof(StgClosure)))
134 #define IS_CHARLIKE_CLOSURE(p) ( stgCast(StgPtr,p) >= stgCast(StgPtr,CHARLIKE_closure) && stgCast(char*,p) <= (stgCast(char*,CHARLIKE_closure) + 255 * sizeof(StgIntCharlikeClosure)))
135 #define IS_INTLIKE_CLOSURE(p) ( stgCast(StgPtr,p) >= stgCast(StgPtr,INTLIKE_closure) && stgCast(char*,p) <= (stgCast(char*,INTLIKE_closure) + 32 * sizeof(StgIntCharlikeClosure)))
137 #define LOOKS_LIKE_STATIC_CLOSURE(r) (((*(((unsigned long *)(r))-1)) == 0) || IS_CHARLIKE_CLOSURE(r) || IS_INTLIKE_CLOSURE(r) || IS_BOOL_CLOSURE(r))
139 #define LOOKS_LIKE_STATIC(r) IS_DATA_PTR(r)
140 #define LOOKS_LIKE_STATIC_CLOSURE(r) IS_DATA_PTR(r)
144 /* -----------------------------------------------------------------------------
145 Macros for distinguishing infotables from closures.
147 You'd think it'd be easy to tell an info pointer from a closure pointer:
148 closures live on the heap and infotables are in read only memory. Right?
149 Wrong! Static closures live in read only memory and Hugs allocates
150 infotables for constructors on the (writable) C heap.
152 ToDo: in the combined Hugs-GHC system, the following are but crude
153 approximations. This absolutely has to be fixed.
154 -------------------------------------------------------------------------- */
156 #ifdef USE_MINIINTERPRETER
157 /* yoiks: one of the dreaded pointer equality tests */
158 #define IS_HUGS_CONSTR_INFO(info) (stgCast(StgInfoTable*,info)->entry == stgCast(StgFunPtr,&Hugs_CONSTR_entry))
160 #define IS_HUGS_CONSTR_INFO(info) 0 /* ToDo: more than mildly bogus */
163 #ifdef USE_MINIINTERPRETER
164 /* in the mininterpreter, we put infotables on closures */
165 #define LOOKS_LIKE_GHC_INFO(info) IS_CODE_PTR(info)
167 /* otherwise we have entry pointers on closures */
168 # ifdef HAVE_WIN32_DLL_SUPPORT
169 # define LOOKS_LIKE_GHC_INFO(info) (!HEAP_ALLOCED(info) && !LOOKS_LIKE_STATIC_CLOSURE(info))
171 # define LOOKS_LIKE_GHC_INFO(info) IS_CODE_PTR(info)
175 /* -----------------------------------------------------------------------------
176 Macros for calculating how big a closure will be (used during allocation)
177 -------------------------------------------------------------------------- */
179 /* ToDo: replace unsigned int by nat. The only fly in the ointment is that
180 * nat comes from Rts.h which many folk dont include. Sigh!
182 static __inline__ StgOffset AP_sizeW ( unsigned int n_args )
183 { return sizeofW(StgAP_UPD) + n_args; }
185 static __inline__ StgOffset PAP_sizeW ( unsigned int n_args )
186 { return sizeofW(StgPAP) + n_args; }
188 static __inline__ StgOffset CONSTR_sizeW( unsigned int p, unsigned int np )
189 { return sizeofW(StgHeader) + p + np; }
191 static __inline__ StgOffset BCO_sizeW ( unsigned int p, unsigned int np, unsigned int is )
192 { return sizeofW(StgBCO) + p + np + (is+sizeof(StgWord)-1)/sizeof(StgWord); }
194 static __inline__ StgOffset THUNK_SELECTOR_sizeW ( void )
195 { return sizeofW(StgHeader) + MIN_UPD_SIZE; }
197 static __inline__ StgOffset BLACKHOLE_sizeW ( void )
198 { return sizeofW(StgHeader) + MIN_UPD_SIZE; }
200 static __inline__ StgOffset CAF_sizeW ( void )
201 { return sizeofW(StgCAF); }
203 /* --------------------------------------------------------------------------
205 * ------------------------------------------------------------------------*/
207 static __inline__ StgOffset size_fromITBL( const StgInfoTable* itbl )
208 { return sizeof(StgClosure)
209 + sizeof(StgPtr) * itbl->layout.payload.ptrs
210 + sizeof(StgWord) * itbl->layout.payload.nptrs; }
212 static __inline__ StgOffset sizeW_fromITBL( const StgInfoTable* itbl )
213 { return sizeofW(StgClosure)
214 + sizeofW(StgPtr) * itbl->layout.payload.ptrs
215 + sizeofW(StgWord) * itbl->layout.payload.nptrs; }
217 static __inline__ StgOffset pap_size( StgPAP* x )
218 { return sizeof(StgPAP)
219 + sizeof(StgWord) * x->n_args; }
221 static __inline__ StgOffset pap_sizeW( StgPAP* x )
222 { return PAP_sizeW(x->n_args); }
224 /* These two functions give the same result - but have slightly
227 static __inline__ StgOffset arr_words_sizeW( StgArrWords* x )
228 { return sizeofW(StgArrWords) + x->words; }
229 static __inline__ StgOffset mut_arr_ptrs_sizeW( StgMutArrPtrs* x )
230 { return sizeofW(StgMutArrPtrs) + x->ptrs; }
232 static __inline__ StgWord bco_sizeW( StgBCO* bco )
233 { return BCO_sizeW(bco->n_ptrs,bco->n_words,bco->n_instrs); }
235 static __inline__ StgWord tso_sizeW ( StgTSO *tso )
236 { return TSO_STRUCT_SIZEW + tso->stack_size; }
238 /* -----------------------------------------------------------------------------
239 Macros for building closures
240 -------------------------------------------------------------------------- */
243 #define SET_PROF_HDR(c,ccs_) (c)->header.prof.ccs = ccs_
244 #define SET_STATIC_PROF_HDR(ccs_) prof : { ccs : ccs_ },
246 #define SET_PROF_HDR(c,ccs)
247 #define SET_STATIC_PROF_HDR(ccs)
251 #define SET_GRAN_HDR(c,pe) (c)->header.gran.procs = pe
252 #define SET_STATIC_GRAN_HDR gran : { procs : Everywhere },
254 #define SET_GRAN_HDR(c,pe)
255 #define SET_STATIC_GRAN_HDR
258 /* there is no PAR header, as far as I can tell -- SDM */
261 #define SET_PAR_HDR(c,stuff)
262 #define SET_STATIC_PAR_HDR(stuff)
264 #define SET_PAR_HDR(c,stuff)
265 #define SET_STATIC_PAR_HDR(stuff)
269 #define SET_TICKY_HDR(c,stuff) (c)->header.ticky.updated = stuff
270 #define SET_STATIC_TICKY_HDR(stuff) ticky : { updated : stuff }
272 #define SET_TICKY_HDR(c,stuff)
273 #define SET_STATIC_TICKY_HDR(stuff)
275 #define SET_HDR(c,info,ccs) \
278 SET_GRAN_HDR((StgClosure *)(c),ThisPE); \
279 SET_PAR_HDR((StgClosure *)(c),LOCAL_GA); \
280 SET_PROF_HDR((StgClosure *)(c),ccs); \
281 SET_TICKY_HDR((StgClosure *)(c),0); \
284 #define SET_ARR_HDR(c,info,costCentreStack,n_words) \
285 SET_HDR(c,info,costCentreStack); \
286 (c)->words = n_words;
288 /* -----------------------------------------------------------------------------
289 Static closures are defined as follows:
292 SET_STATIC_HDR(PrelBase_CZh_closure,PrelBase_CZh_info,costCentreStack,const);
294 The info argument must have type 'StgInfoTable' or
295 'StgSRTInfoTable', since we use '&' to get its address in the macro.
296 -------------------------------------------------------------------------- */
298 #define SET_STATIC_HDR(label,info,costCentreStack,closure_class,info_class) \
300 closure_class StgClosure label = { \
301 STATIC_HDR(info,costCentreStack)
303 #define STATIC_HDR(info,ccs) \
306 SET_STATIC_GRAN_HDR \
307 SET_STATIC_PAR_HDR(LOCAL_GA) \
308 SET_STATIC_PROF_HDR(ccs) \
309 SET_STATIC_TICKY_HDR(0) \
312 /* how to get hold of the static link field for a static closure.
314 * Note that we have to use (*cast(T*,&e)) instead of cast(T,e)
315 * because C won't let us take the address of a casted expression. Huh?
317 #define STATIC_LINK(info,p) \
318 (*stgCast(StgClosure**,&((p)->payload[info->layout.payload.ptrs + \
319 info->layout.payload.nptrs])))
320 #define STATIC_LINK2(info,p) \
321 (*stgCast(StgClosure**,&((p)->payload[info->layout.payload.ptrs + \
322 info->layout.payload.nptrs + 1])))
324 /* -----------------------------------------------------------------------------
325 INTLIKE and CHARLIKE closures.
326 -------------------------------------------------------------------------- */
328 #define CHARLIKE_CLOSURE(n) ((P_)&CHARLIKE_closure[n])
329 #define INTLIKE_CLOSURE(n) ((P_)&INTLIKE_closure[(n)-MIN_INTLIKE])
331 /* -----------------------------------------------------------------------------
333 -------------------------------------------------------------------------- */
335 #define payloadPtr( c, i ) (*stgCast(StgPtr*, ((c)->payload+(i))))
336 #define payloadCPtr( c, i ) (*stgCast(StgClosure**, ((c)->payload+(i))))
337 #define payloadWord( c, i ) (*stgCast(StgWord*, ((c)->payload+(i))))
339 /* -----------------------------------------------------------------------------
341 -------------------------------------------------------------------------- */
343 /* constructors don't have SRTs */
344 #define GET_TAG(info) (INFO_PTR_TO_STRUCT(info)->srt_len)
346 /* -----------------------------------------------------------------------------
348 -------------------------------------------------------------------------- */
350 #define bcoConstPtr( bco, i ) (*stgCast(StgPtr*, ((bco)->payload+(i))))
351 #define bcoConstCPtr( bco, i ) (*stgCast(StgClosurePtr*,((bco)->payload+(i))))
352 #define bcoConstInfoPtr( bco, i )(*stgCast(StgInfoTable**,((bco)->payload+(bco)->n_ptrs+i)))
353 #define bcoConstInt( bco, i ) (*stgCast(StgInt*, ((bco)->payload+(bco)->n_ptrs+i)))
354 #define bcoConstInt64( bco, i ) (PK_Int64(stgCast(StgWord*,(bco)->payload+(bco)->n_ptrs+i)))
355 #define bcoConstWord( bco, i ) (*stgCast(StgWord*, ((bco)->payload+(bco)->n_ptrs+i)))
356 #define bcoConstAddr( bco, i ) (*stgCast(StgAddr*, ((bco)->payload+(bco)->n_ptrs+i)))
357 #define bcoConstChar( bco, i ) (*stgCast(StgChar*, ((bco)->payload+(bco)->n_ptrs+i)))
358 #define bcoConstFloat( bco, i ) (PK_FLT(stgCast(StgWord*,(bco)->payload+(bco)->n_ptrs+i)))
359 #define bcoConstDouble( bco, i ) (PK_DBL(stgCast(StgWord*,(bco)->payload+(bco)->n_ptrs+i)))
360 #define bcoInstr( bco, i ) (stgCast(StgWord8*, ((bco)->payload+(bco)->n_ptrs+(bco)->n_words))[i])
362 #endif /* CLOSUREMACROS_H */