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Diffstat (limited to 'rts/RtsStartup.c')
| -rw-r--r-- | rts/RtsStartup.c | 457 |
1 files changed, 457 insertions, 0 deletions
diff --git a/rts/RtsStartup.c b/rts/RtsStartup.c new file mode 100644 index 0000000000..147de7b857 --- /dev/null +++ b/rts/RtsStartup.c @@ -0,0 +1,457 @@ +/* ----------------------------------------------------------------------------- + * + * (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 <stdlib.h> + +#ifdef HAVE_TERMIOS_H +#include <termios.h> +#endif +#ifdef HAVE_SIGNAL_H +#include <signal.h> +#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_<module>" 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); +} |