Implement -XStaticValues
[ghc.git] / includes / Rts.h
1 /* -----------------------------------------------------------------------------
2 *
3 * (c) The GHC Team, 1998-2009
4 *
5 * RTS external APIs. This file declares everything that the GHC RTS
6 * exposes externally.
7 *
8 * To understand the structure of the RTS headers, see the wiki:
9 * http://ghc.haskell.org/trac/ghc/wiki/Commentary/SourceTree/Includes
10 *
11 * ---------------------------------------------------------------------------*/
12
13 #ifndef RTS_H
14 #define RTS_H
15
16 #ifdef __cplusplus
17 extern "C" {
18 #endif
19
20 /* We include windows.h very early, as on Win64 the CONTEXT type has
21 fields "R8", "R9" and "R10", which goes bad if we've already
22 #define'd those names for our own purposes (in stg/Regs.h) */
23 #if defined(HAVE_WINDOWS_H)
24 #include <windows.h>
25 #endif
26
27 #ifndef IN_STG_CODE
28 #define IN_STG_CODE 0
29 #endif
30 #include "Stg.h"
31
32 #include "HsFFI.h"
33 #include "RtsAPI.h"
34
35 // Turn off inlining when debugging - it obfuscates things
36 #ifdef DEBUG
37 # undef STATIC_INLINE
38 # define STATIC_INLINE static
39 #endif
40
41 #include "rts/Types.h"
42
43 #if __GNUC__ >= 3
44 /* Assume that a flexible array member at the end of a struct
45 * can be defined thus: T arr[]; */
46 #define FLEXIBLE_ARRAY
47 #else
48 /* Assume that it must be defined thus: T arr[0]; */
49 #define FLEXIBLE_ARRAY 0
50 #endif
51
52 #if __GNUC__ >= 3
53 #define ATTRIBUTE_ALIGNED(n) __attribute__((aligned(n)))
54 #else
55 #define ATTRIBUTE_ALIGNED(n) /*nothing*/
56 #endif
57
58 // Symbols that are extern, but private to the RTS, are declared
59 // with visibility "hidden" to hide them outside the RTS shared
60 // library.
61 #if defined(HAS_VISIBILITY_HIDDEN)
62 #define RTS_PRIVATE GNUC3_ATTRIBUTE(visibility("hidden"))
63 #else
64 #define RTS_PRIVATE /* disabled: RTS_PRIVATE */
65 #endif
66
67 #if __GNUC__ >= 4
68 #define RTS_UNLIKELY(p) __builtin_expect((p),0)
69 #else
70 #define RTS_UNLIKELY(p) p
71 #endif
72
73 /* Fix for mingw stat problem (done here so it's early enough) */
74 #ifdef mingw32_HOST_OS
75 #define __MSVCRT__ 1
76 #endif
77
78 /* Needed to get the macro version of errno on some OSs, and also to
79 get prototypes for the _r versions of C library functions. */
80 #ifndef _REENTRANT
81 #define _REENTRANT 1
82 #endif
83
84 /*
85 * We often want to know the size of something in units of an
86 * StgWord... (rounded up, of course!)
87 */
88 #define ROUNDUP_BYTES_TO_WDS(n) (((n) + sizeof(W_) - 1) / sizeof(W_))
89
90 #define sizeofW(t) ROUNDUP_BYTES_TO_WDS(sizeof(t))
91
92 /* -----------------------------------------------------------------------------
93 Assertions and Debuggery
94
95 CHECK(p) evaluates p and terminates with an error if p is false
96 ASSERT(p) like CHECK(p) if DEBUG is on, otherwise a no-op
97 -------------------------------------------------------------------------- */
98
99 void _assertFail(const char *filename, unsigned int linenum)
100 GNUC3_ATTRIBUTE(__noreturn__);
101
102 #define CHECK(predicate) \
103 if (predicate) \
104 /*null*/; \
105 else \
106 _assertFail(__FILE__, __LINE__)
107
108 #define CHECKM(predicate, msg, ...) \
109 if (predicate) \
110 /*null*/; \
111 else \
112 barf(msg, ##__VA_ARGS__)
113
114 #ifndef DEBUG
115 #define ASSERT(predicate) /* nothing */
116 #define ASSERTM(predicate,msg,...) /* nothing */
117 #else
118 #define ASSERT(predicate) CHECK(predicate)
119 #define ASSERTM(predicate,msg,...) CHECKM(predicate,msg,##__VA_ARGS__)
120 #endif /* DEBUG */
121
122 /*
123 * Use this on the RHS of macros which expand to nothing
124 * to make sure that the macro can be used in a context which
125 * demands a non-empty statement.
126 */
127
128 #define doNothing() do { } while (0)
129
130 #ifdef DEBUG
131 #define USED_IF_DEBUG
132 #define USED_IF_NOT_DEBUG STG_UNUSED
133 #else
134 #define USED_IF_DEBUG STG_UNUSED
135 #define USED_IF_NOT_DEBUG
136 #endif
137
138 #ifdef THREADED_RTS
139 #define USED_IF_THREADS
140 #define USED_IF_NOT_THREADS STG_UNUSED
141 #else
142 #define USED_IF_THREADS STG_UNUSED
143 #define USED_IF_NOT_THREADS
144 #endif
145
146 #define FMT_SizeT "zu"
147 #define FMT_HexSizeT "zx"
148
149 /* -----------------------------------------------------------------------------
150 Time values in the RTS
151 -------------------------------------------------------------------------- */
152
153 // For most time values in the RTS we use a fixed resolution of nanoseconds,
154 // normalising the time we get from platform-dependent APIs to this
155 // resolution.
156 #define TIME_RESOLUTION 1000000000
157 typedef StgInt64 Time;
158
159 #define TIME_MAX HS_INT64_MAX
160
161 #if TIME_RESOLUTION == 1000000000
162 // I'm being lazy, but it's awkward to define fully general versions of these
163 #define TimeToUS(t) ((t) / 1000)
164 #define TimeToNS(t) (t)
165 #define USToTime(t) ((Time)(t) * 1000)
166 #define NSToTime(t) ((Time)(t))
167 #else
168 #error Fix TimeToNS(), TimeToUS() etc.
169 #endif
170
171 #define SecondsToTime(t) ((Time)(t) * TIME_RESOLUTION)
172 #define TimeToSeconds(t) ((t) / TIME_RESOLUTION)
173
174 // Use instead of SecondsToTime() when we have a floating-point
175 // seconds value, to avoid truncating it.
176 INLINE_HEADER Time fsecondsToTime (double t)
177 {
178 return (Time)(t * TIME_RESOLUTION);
179 }
180
181 /* -----------------------------------------------------------------------------
182 Include everything STG-ish
183 -------------------------------------------------------------------------- */
184
185 /* System headers: stdlib.h is needed so that we can use NULL. It must
186 * come after MachRegs.h, because stdlib.h might define some inline
187 * functions which may only be defined after register variables have
188 * been declared.
189 */
190 #include <stdlib.h>
191
192 #include "rts/Config.h"
193
194 /* Global constaints */
195 #include "rts/Constants.h"
196
197 /* Profiling information */
198 #include "rts/prof/CCS.h"
199 #include "rts/prof/LDV.h"
200
201 /* Parallel information */
202 #include "rts/OSThreads.h"
203 #include "rts/SpinLock.h"
204
205 #include "rts/Messages.h"
206 #include "rts/Threads.h"
207
208 /* Storage format definitions */
209 #include "rts/storage/FunTypes.h"
210 #include "rts/storage/InfoTables.h"
211 #include "rts/storage/Closures.h"
212 #include "rts/storage/ClosureTypes.h"
213 #include "rts/storage/TSO.h"
214 #include "stg/MiscClosures.h" /* InfoTables, closures etc. defined in the RTS */
215 #include "rts/storage/SMPClosureOps.h"
216 #include "rts/storage/Block.h"
217 #include "rts/storage/ClosureMacros.h"
218 #include "rts/storage/MBlock.h"
219 #include "rts/storage/GC.h"
220
221 /* Other RTS external APIs */
222 #include "rts/Parallel.h"
223 #include "rts/Hooks.h"
224 #include "rts/Signals.h"
225 #include "rts/BlockSignals.h"
226 #include "rts/Hpc.h"
227 #include "rts/Flags.h"
228 #include "rts/Adjustor.h"
229 #include "rts/FileLock.h"
230 #include "rts/GetTime.h"
231 #include "rts/Globals.h"
232 #include "rts/IOManager.h"
233 #include "rts/Linker.h"
234 #include "rts/Ticky.h"
235 #include "rts/Timer.h"
236 #include "rts/Stable.h"
237 #include "rts/TTY.h"
238 #include "rts/Utils.h"
239 #include "rts/PrimFloat.h"
240 #include "rts/Main.h"
241 #include "rts/StaticPtrTable.h"
242
243 /* Misc stuff without a home */
244 DLL_IMPORT_RTS extern char **prog_argv; /* so we can get at these from Haskell */
245 DLL_IMPORT_RTS extern int prog_argc;
246 DLL_IMPORT_RTS extern char *prog_name;
247
248 #ifdef mingw32_HOST_OS
249 // We need these two from Haskell too
250 void getWin32ProgArgv(int *argc, wchar_t **argv[]);
251 void setWin32ProgArgv(int argc, wchar_t *argv[]);
252 #endif
253
254 void stackOverflow(StgTSO* tso);
255
256 void stg_exit(int n) GNU_ATTRIBUTE(__noreturn__);
257
258 #ifndef mingw32_HOST_OS
259 int stg_sig_install (int, int, void *);
260 #endif
261
262 /* -----------------------------------------------------------------------------
263 Ways
264 -------------------------------------------------------------------------- */
265
266 // Returns non-zero if the RTS is a profiling version
267 int rts_isProfiled(void);
268
269 // Returns non-zero if the RTS is a dynamically-linked version
270 int rts_isDynamic(void);
271
272 /* -----------------------------------------------------------------------------
273 RTS Exit codes
274 -------------------------------------------------------------------------- */
275
276 /* 255 is allegedly used by dynamic linkers to report linking failure */
277 #define EXIT_INTERNAL_ERROR 254
278 #define EXIT_DEADLOCK 253
279 #define EXIT_INTERRUPTED 252
280 #define EXIT_HEAPOVERFLOW 251
281 #define EXIT_KILLED 250
282
283 /* -----------------------------------------------------------------------------
284 Miscellaneous garbage
285 -------------------------------------------------------------------------- */
286
287 #ifdef DEBUG
288 #define TICK_VAR(arity) \
289 extern StgInt SLOW_CALLS_##arity; \
290 extern StgInt RIGHT_ARITY_##arity; \
291 extern StgInt TAGGED_PTR_##arity;
292
293 extern StgInt TOTAL_CALLS;
294
295 TICK_VAR(1)
296 TICK_VAR(2)
297 #endif
298
299 /* -----------------------------------------------------------------------------
300 Assertions and Debuggery
301 -------------------------------------------------------------------------- */
302
303 #define IF_RTSFLAGS(c,s) if (RtsFlags.c) { s; }
304
305 #ifdef DEBUG
306 #if IN_STG_CODE
307 #define IF_DEBUG(c,s) if (RtsFlags[0].DebugFlags.c) { s; }
308 #else
309 #define IF_DEBUG(c,s) if (RtsFlags.DebugFlags.c) { s; }
310 #endif
311 #else
312 #define IF_DEBUG(c,s) doNothing()
313 #endif
314
315 #ifdef DEBUG
316 #define DEBUG_ONLY(s) s
317 #else
318 #define DEBUG_ONLY(s) doNothing()
319 #endif
320
321 #ifdef DEBUG
322 #define DEBUG_IS_ON 1
323 #else
324 #define DEBUG_IS_ON 0
325 #endif
326
327 /* -----------------------------------------------------------------------------
328 Useful macros and inline functions
329 -------------------------------------------------------------------------- */
330
331 #if defined(__GNUC__)
332 #define SUPPORTS_TYPEOF
333 #endif
334
335 #if defined(SUPPORTS_TYPEOF)
336 #define stg_min(a,b) ({typeof(a) _a = (a), _b = (b); _a <= _b ? _a : _b; })
337 #define stg_max(a,b) ({typeof(a) _a = (a), _b = (b); _a <= _b ? _b : _a; })
338 #else
339 #define stg_min(a,b) ((a) <= (b) ? (a) : (b))
340 #define stg_max(a,b) ((a) <= (b) ? (b) : (a))
341 #endif
342
343 /* -------------------------------------------------------------------------- */
344
345 #ifdef __cplusplus
346 }
347 #endif
348
349 #endif /* RTS_H */