/* ----------------------------------------------------------------------------- * * (c) The GHC Team, 1998-2002 * * Main function for a standalone Haskell program. * * ---------------------------------------------------------------------------*/ #include "PosixSource.h" #include "Rts.h" #include "RtsAPI.h" #include "RtsUtils.h" #include "RtsFlags.h" #include "OSThreads.h" #include "Storage.h" /* initStorage, exitStorage */ #include "Schedule.h" /* initScheduler */ #include "Stats.h" /* initStats */ #include "STM.h" /* initSTM */ #include "Signals.h" #include "RtsSignals.h" #include "Timer.h" /* startTimer, stopTimer */ #include "Weak.h" #include "Ticky.h" #include "StgRun.h" #include "Prelude.h" /* fixupRTStoPreludeRefs */ #include "HsFFI.h" #include "Linker.h" #include "ThreadLabels.h" #include "BlockAlloc.h" #if defined(RTS_GTK_FRONTPANEL) #include "FrontPanel.h" #endif #if defined(PROFILING) || defined(DEBUG) # include "Profiling.h" # include "ProfHeap.h" # include "RetainerProfile.h" #endif #if defined(GRAN) # include "GranSimRts.h" #endif #if defined(GRAN) || defined(PAR) # include "ParallelRts.h" #endif #if defined(PAR) # include "Parallel.h" # include "LLC.h" #endif #if defined(mingw32_HOST_OS) #include "win32/AsyncIO.h" #endif #include #ifdef HAVE_TERMIOS_H #include #endif #ifdef HAVE_SIGNAL_H #include #endif // Count of how many outstanding hs_init()s there have been. static int hs_init_count = 0; // Here we save the terminal settings on the standard file // descriptors, if we need to change them (eg. to support NoBuffering // input). static void *saved_termios[3] = {NULL,NULL,NULL}; void* __hscore_get_saved_termios(int fd) { return (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) ? saved_termios[fd] : NULL; } void __hscore_set_saved_termios(int fd, void* ts) { if (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) { saved_termios[fd] = ts; } } /* ----------------------------------------------------------------------------- Initialise floating point unit on x86 (currently disabled. why?) (see comment in ghc/compiler/nativeGen/MachInstrs.lhs). -------------------------------------------------------------------------- */ #define X86_INIT_FPU 0 #if X86_INIT_FPU static void x86_init_fpu ( void ) { __volatile unsigned short int fpu_cw; // Grab the control word __asm __volatile ("fnstcw %0" : "=m" (fpu_cw)); #if 0 printf("fpu_cw: %x\n", fpu_cw); #endif // Set bits 8-9 to 10 (64-bit precision). fpu_cw = (fpu_cw & 0xfcff) | 0x0200; // Store the new control word back __asm __volatile ("fldcw %0" : : "m" (fpu_cw)); } #endif /* ----------------------------------------------------------------------------- Starting up the RTS -------------------------------------------------------------------------- */ void hs_init(int *argc, char **argv[]) { hs_init_count++; if (hs_init_count > 1) { // second and subsequent inits are ignored return; } /* The very first thing we do is grab the start time...just in case we're * collecting timing statistics. */ stat_startInit(); #ifdef PAR /* * The parallel system needs to be initialised and synchronised before * the program is run. */ startupParallelSystem(argv); if (*argv[0] == '-') { /* Strip off mainPE flag argument */ argv++; argc--; } argv[1] = argv[0]; /* ignore the nPEs argument */ argv++; argc--; #endif /* Set the RTS flags to default values. */ initRtsFlagsDefaults(); /* Call the user hook to reset defaults, if present */ defaultsHook(); /* Parse the flags, separating the RTS flags from the programs args */ if (argc != NULL && argv != NULL) { setupRtsFlags(argc, *argv, &rts_argc, rts_argv); setProgArgv(*argc,*argv); } #if defined(PAR) /* NB: this really must be done after processing the RTS flags */ IF_PAR_DEBUG(verbose, debugBelch("==== Synchronising system (%d PEs)\n", nPEs)); synchroniseSystem(); // calls initParallelSystem etc #endif /* PAR */ /* Perform initialisation of adjustor thunk layer. */ initAdjustor(); /* initialise scheduler data structures (needs to be done before * initStorage()). */ initScheduler(); #if defined(GRAN) /* And start GranSim profiling if required: */ if (RtsFlags.GranFlags.GranSimStats.Full) init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv); #elif defined(PAR) /* And start GUM profiling if required: */ if (RtsFlags.ParFlags.ParStats.Full) init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv); #endif /* PAR || GRAN */ /* initialize the storage manager */ initStorage(); /* initialise the stable pointer table */ initStablePtrTable(); #if defined(DEBUG) /* initialise thread label table (tso->char*) */ initThreadLabelTable(); #endif #if defined(PROFILING) || defined(DEBUG) initProfiling1(); #endif /* start the virtual timer 'subsystem'. */ startTimer(TICK_MILLISECS); /* Initialise the stats department */ initStats(); #if defined(RTS_USER_SIGNALS) /* Initialise the user signal handler set */ initUserSignals(); /* Set up handler to run on SIGINT, etc. */ initDefaultHandlers(); #endif #if defined(mingw32_HOST_OS) startupAsyncIO(); #endif #ifdef RTS_GTK_FRONTPANEL if (RtsFlags.GcFlags.frontpanel) { initFrontPanel(); } #endif #if X86_INIT_FPU x86_init_fpu(); #endif /* Record initialization times */ stat_endInit(); } // Compatibility interface void startupHaskell(int argc, char *argv[], void (*init_root)(void)) { hs_init(&argc, &argv); if(init_root) hs_add_root(init_root); } /* ----------------------------------------------------------------------------- Per-module initialisation This process traverses all the compiled modules in the program starting with "Main", and performing per-module initialisation for each one. So far, two things happen at initialisation time: - we register stable names for each foreign-exported function in that module. This prevents foreign-exported entities, and things they depend on, from being garbage collected. - we supply a unique integer to each statically declared cost centre and cost centre stack in the program. The code generator inserts a small function "__stginit_" in each module and calls the registration functions in each of the modules it imports. The init* functions are compiled in the same way as STG code, i.e. without normal C call/return conventions. Hence we must use StgRun to call this stuff. -------------------------------------------------------------------------- */ /* The init functions use an explicit stack... */ #define INIT_STACK_BLOCKS 4 static F_ *init_stack = NULL; void hs_add_root(void (*init_root)(void)) { bdescr *bd; nat init_sp; Capability *cap = &MainCapability; if (hs_init_count <= 0) { barf("hs_add_root() must be called after hs_init()"); } /* The initialisation stack grows downward, with sp pointing to the last occupied word */ init_sp = INIT_STACK_BLOCKS*BLOCK_SIZE_W; bd = allocGroup_lock(INIT_STACK_BLOCKS); init_stack = (F_ *)bd->start; init_stack[--init_sp] = (F_)stg_init_finish; if (init_root != NULL) { init_stack[--init_sp] = (F_)init_root; } cap->r.rSp = (P_)(init_stack + init_sp); StgRun((StgFunPtr)stg_init, &cap->r); freeGroup_lock(bd); #if defined(PROFILING) || defined(DEBUG) // This must be done after module initialisation. // ToDo: make this work in the presence of multiple hs_add_root()s. initProfiling2(); #endif } /* ----------------------------------------------------------------------------- Shutting down the RTS -------------------------------------------------------------------------- */ void hs_exit(void) { if (hs_init_count <= 0) { errorBelch("warning: too many hs_exit()s"); return; } hs_init_count--; if (hs_init_count > 0) { // ignore until it's the last one return; } /* start timing the shutdown */ stat_startExit(); /* stop all running tasks */ exitScheduler(); #if defined(GRAN) /* end_gr_simulation prints global stats if requested -- HWL */ if (!RtsFlags.GranFlags.GranSimStats.Suppressed) end_gr_simulation(); #endif /* stop the ticker */ stopTimer(); /* reset the standard file descriptors to blocking mode */ resetNonBlockingFd(0); resetNonBlockingFd(1); resetNonBlockingFd(2); #if HAVE_TERMIOS_H // Reset the terminal settings on the standard file descriptors, // if we changed them. See System.Posix.Internals.tcSetAttr for // more details, including the reason we termporarily disable // SIGTTOU here. { int fd; sigset_t sigset, old_sigset; sigemptyset(&sigset); sigaddset(&sigset, SIGTTOU); sigprocmask(SIG_BLOCK, &sigset, &old_sigset); for (fd = 0; fd <= 2; fd++) { struct termios* ts = (struct termios*)__hscore_get_saved_termios(fd); if (ts != NULL) { tcsetattr(fd,TCSANOW,ts); } } sigprocmask(SIG_SETMASK, &old_sigset, NULL); } #endif #if defined(PAR) /* controlled exit; good thread! */ shutdownParallelSystem(0); /* global statistics in parallel system */ PAR_TICKY_PAR_END(); #endif /* stop timing the shutdown, we're about to print stats */ stat_endExit(); // clean up things from the storage manager's point of view. // also outputs the stats (+RTS -s) info. exitStorage(); #ifdef RTS_GTK_FRONTPANEL if (RtsFlags.GcFlags.frontpanel) { stopFrontPanel(); } #endif #if defined(PROFILING) reportCCSProfiling(); #endif #if defined(PROFILING) || defined(DEBUG) endProfiling(); #endif #ifdef PROFILING // Originally, this was in report_ccs_profiling(). Now, retainer // profiling might tack some extra stuff on to the end of this file // during endProfiling(). fclose(prof_file); #endif #if defined(TICKY_TICKY) if (RtsFlags.TickyFlags.showTickyStats) PrintTickyInfo(); #endif #if defined(mingw32_HOST_OS) shutdownAsyncIO(); #endif // Finally, free all our storage. freeStorage(); } // Compatibility interfaces void shutdownHaskell(void) { hs_exit(); } void shutdownHaskellAndExit(int n) { if (hs_init_count == 1) { OnExitHook(); hs_exit(); #if defined(PAR) /* really exit (stg_exit() would call shutdownParallelSystem() again) */ exit(n); #else stg_exit(n); #endif } } /* * called from STG-land to exit the program */ #ifdef PAR static int exit_started=rtsFalse; #endif void stg_exit(int n) { #ifdef PAR /* HACK: avoid a loop when exiting due to a stupid error */ if (exit_started) return; exit_started=rtsTrue; IF_PAR_DEBUG(verbose, debugBelch("==-- stg_exit %d on [%x]...", n, mytid)); shutdownParallelSystem(n); #endif exit(n); }