1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 1998-2002
5 * Main function for a standalone Haskell program.
7 * ---------------------------------------------------------------------------*/
9 // PAPI uses caddr_t, which is not POSIX
11 #include "PosixSource.h"
18 #include "sm/Storage.h"
21 #include "Schedule.h" /* initScheduler */
22 #include "Stats.h" /* initStats */
23 #include "STM.h" /* initSTM */
24 #include "RtsSignals.h"
28 #include "Prelude.h" /* fixupRTStoPreludeRefs */
29 #include "ThreadLabels.h"
30 #include "sm/BlockAlloc.h"
34 #include "Profiling.h"
37 void exitLinker( void ); // there is no Linker.h file to include
39 #if defined(RTS_GTK_FRONTPANEL)
40 #include "FrontPanel.h"
43 #if defined(PROFILING)
44 # include "ProfHeap.h"
45 # include "RetainerProfile.h"
48 #if defined(mingw32_HOST_OS) && !defined(THREADED_RTS)
49 #include "win32/AsyncIO.h"
52 #if !defined(mingw32_HOST_OS)
53 #include "posix/TTY.h"
54 #include "posix/FileLock.h"
68 // Count of how many outstanding hs_init()s there have been.
69 static int hs_init_count = 0;
71 /* -----------------------------------------------------------------------------
72 Initialise floating point unit on x86 (currently disabled. why?)
73 (see comment in ghc/compiler/nativeGen/MachInstrs.lhs).
74 -------------------------------------------------------------------------- */
76 #define X86_INIT_FPU 0
82 __volatile unsigned short int fpu_cw;
84 // Grab the control word
85 __asm __volatile ("fnstcw %0" : "=m" (fpu_cw));
88 printf("fpu_cw: %x\n", fpu_cw);
91 // Set bits 8-9 to 10 (64-bit precision).
92 fpu_cw = (fpu_cw & 0xfcff) | 0x0200;
94 // Store the new control word back
95 __asm __volatile ("fldcw %0" : : "m" (fpu_cw));
99 /* -----------------------------------------------------------------------------
101 -------------------------------------------------------------------------- */
104 hs_init(int *argc, char **argv[])
107 if (hs_init_count > 1) {
108 // second and subsequent inits are ignored
112 setlocale(LC_CTYPE,"");
114 /* Initialise the stats department, phase 0 */
117 /* Next we do is grab the start time...just in case we're
118 * collecting timing statistics.
123 /* Start off by initialising the allocator debugging so we can
128 /* Set the RTS flags to default values. */
130 initRtsFlagsDefaults();
132 /* Call the user hook to reset defaults, if present */
135 /* Parse the flags, separating the RTS flags from the programs args */
136 if (argc != NULL && argv != NULL) {
137 setFullProgArgv(*argc,*argv);
138 setupRtsFlags(argc, *argv, &rts_argc, rts_argv);
139 setProgArgv(*argc,*argv);
142 /* Initialise the stats department, phase 1 */
149 /* initTracing must be after setupRtsFlags() */
153 /* Dtrace events are always enabled
155 dtraceEventStartup();
157 /* initialise scheduler data structures (needs to be done before
162 /* initialize the storage manager */
165 /* initialise the stable pointer table */
166 initStablePtrTable();
168 /* Add some GC roots for things in the base package that the RTS
169 * knows about. We don't know whether these turn out to be CAFs
170 * or refer to CAFs, but we have to assume that they might.
172 getStablePtr((StgPtr)runIO_closure);
173 getStablePtr((StgPtr)runNonIO_closure);
175 getStablePtr((StgPtr)runFinalizerBatch_closure);
177 getStablePtr((StgPtr)stackOverflow_closure);
178 getStablePtr((StgPtr)heapOverflow_closure);
179 getStablePtr((StgPtr)unpackCString_closure);
180 getStablePtr((StgPtr)blockedIndefinitelyOnMVar_closure);
181 getStablePtr((StgPtr)nonTermination_closure);
182 getStablePtr((StgPtr)blockedIndefinitelyOnSTM_closure);
183 getStablePtr((StgPtr)nestedAtomically_closure);
185 getStablePtr((StgPtr)runSparks_closure);
186 getStablePtr((StgPtr)ensureIOManagerIsRunning_closure);
187 #ifndef mingw32_HOST_OS
188 getStablePtr((StgPtr)runHandlers_closure);
191 /* initialise the shared Typeable store */
194 /* initialise file locking, if necessary */
195 #if !defined(mingw32_HOST_OS)
200 /* initialise thread label table (tso->char*) */
201 initThreadLabelTable();
206 /* start the virtual timer 'subsystem'. */
210 #if defined(RTS_USER_SIGNALS)
211 if (RtsFlags.MiscFlags.install_signal_handlers) {
212 /* Initialise the user signal handler set */
214 /* Set up handler to run on SIGINT, etc. */
215 initDefaultHandlers();
219 #if defined(mingw32_HOST_OS) && !defined(THREADED_RTS)
223 #ifdef RTS_GTK_FRONTPANEL
224 if (RtsFlags.GcFlags.frontpanel) {
233 /* Record initialization times */
237 // Compatibility interface
239 startupHaskell(int argc, char *argv[], void (*init_root)(void))
241 hs_init(&argc, &argv);
243 hs_add_root(init_root);
247 /* -----------------------------------------------------------------------------
248 Per-module initialisation
250 This process traverses all the compiled modules in the program
251 starting with "Main", and performing per-module initialisation for
254 So far, two things happen at initialisation time:
256 - we register stable names for each foreign-exported function
257 in that module. This prevents foreign-exported entities, and
258 things they depend on, from being garbage collected.
260 - we supply a unique integer to each statically declared cost
261 centre and cost centre stack in the program.
263 The code generator inserts a small function "__stginit_<module>" in each
264 module and calls the registration functions in each of the modules it
267 The init* functions are compiled in the same way as STG code,
268 i.e. without normal C call/return conventions. Hence we must use
269 StgRun to call this stuff.
270 -------------------------------------------------------------------------- */
272 /* The init functions use an explicit stack...
274 #define INIT_STACK_BLOCKS 4
275 static StgFunPtr *init_stack = NULL;
278 hs_add_root(void (*init_root)(void))
286 if (hs_init_count <= 0) {
287 barf("hs_add_root() must be called after hs_init()");
290 /* The initialisation stack grows downward, with sp pointing
291 to the last occupied word */
292 init_sp = INIT_STACK_BLOCKS*BLOCK_SIZE_W;
293 bd = allocGroup_lock(INIT_STACK_BLOCKS);
294 init_stack = (StgFunPtr *)bd->start;
295 init_stack[--init_sp] = (StgFunPtr)stg_init_finish;
296 if (init_root != NULL) {
297 init_stack[--init_sp] = (StgFunPtr)init_root;
300 cap->r.rSp = (P_)(init_stack + init_sp);
301 StgRun((StgFunPtr)stg_init, &cap->r);
307 // This must be done after module initialisation.
308 // ToDo: make this work in the presence of multiple hs_add_root()s.
314 #if defined(THREADED_RTS)
319 /* ----------------------------------------------------------------------------
320 * Shutting down the RTS
322 * The wait_foreign parameter means:
323 * True ==> wait for any threads doing foreign calls now.
324 * False ==> threads doing foreign calls may return in the
325 * future, but will immediately block on a mutex.
326 * (capability->lock).
328 * If this RTS is a DLL that we're about to unload, then you want
329 * safe=True, otherwise the thread might return to code that has been
330 * unloaded. If this is a standalone program that is about to exit,
331 * then you can get away with safe=False, which is better because we
332 * won't hang on exit if there is a blocked foreign call outstanding.
334 ------------------------------------------------------------------------- */
337 hs_exit_(rtsBool wait_foreign)
339 if (hs_init_count <= 0) {
340 errorBelch("warning: too many hs_exit()s");
344 if (hs_init_count > 0) {
345 // ignore until it's the last one
349 /* start timing the shutdown */
354 // Free the full argv storage
357 #if defined(THREADED_RTS)
361 /* stop all running tasks */
362 exitScheduler(wait_foreign);
364 /* run C finalizers for all active weak pointers */
365 runAllCFinalizers(weak_ptr_list);
367 #if defined(RTS_USER_SIGNALS)
368 if (RtsFlags.MiscFlags.install_signal_handlers) {
369 freeSignalHandlers();
373 /* stop the ticker */
375 exitTimer(wait_foreign);
377 // set the terminal settings back to what they were
378 #if !defined(mingw32_HOST_OS)
379 resetTerminalSettings();
382 // uninstall signal handlers
383 resetDefaultHandlers();
385 /* stop timing the shutdown, we're about to print stats */
388 /* shutdown the hpc support (if needed) */
391 // clean up things from the storage manager's point of view.
392 // also outputs the stats (+RTS -s) info.
398 /* free shared Typeable store */
401 /* free linker data */
404 /* free file locking tables, if necessary */
405 #if !defined(mingw32_HOST_OS)
409 /* free the stable pointer table */
410 exitStablePtrTable();
413 /* free the thread label table */
414 freeThreadLabelTable();
417 #ifdef RTS_GTK_FRONTPANEL
418 if (RtsFlags.GcFlags.frontpanel) {
423 #if defined(PROFILING)
424 reportCCSProfiling();
431 // Originally, this was in report_ccs_profiling(). Now, retainer
432 // profiling might tack some extra stuff on to the end of this file
433 // during endProfiling().
434 if (prof_file != NULL) fclose(prof_file);
442 #if defined(TICKY_TICKY)
443 if (RtsFlags.TickyFlags.showTickyStats) PrintTickyInfo();
446 #if defined(mingw32_HOST_OS) && !defined(THREADED_RTS)
447 shutdownAsyncIO(wait_foreign);
450 /* free hash table storage */
453 // Finally, free all our storage
457 /* and shut down the allocator debugging */
463 // The real hs_exit():
468 // be safe; this might be a DLL
471 // Compatibility interfaces
473 shutdownHaskell(void)
479 shutdownHaskellAndExit(int n)
481 // we're about to exit(), no need to wait for foreign calls to return.
484 if (hs_init_count == 0) {
489 #ifndef mingw32_HOST_OS
491 shutdownHaskellAndSignal(int sig)
499 * called from STG-land to exit the program
502 void (*exitFn)(int) = 0;