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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team 1998-2000
*
* Main function for a standalone Haskell program.
*
* ---------------------------------------------------------------------------*/
#define COMPILING_RTS_MAIN
#include "rts/PosixSource.h"
#include "Rts.h"
#include "RtsAPI.h"
#include "RtsUtils.h"
#include "RtsFlags.h"
#include "Prelude.h"
#include "Task.h"
#include "Excn.h"
#if defined(DEBUG)
# include "Printer.h" /* for printing */
#endif
// Hack: we assume that we're building a batch-mode system unless
// INTERPRETER is set
#if !defined(INTERPRETER) /* Hack */
// The rts entry point from a compiled program using a Haskell main
// function. This gets called from a tiny main function generated by
// GHC and linked into each compiled Haskell program that uses a
// Haskell main function.
//
// We expect the caller to pass ZCMain_main_closure for
// main_closure. The reason we cannot refer to this symbol directly
// is because we're inside the rts and we do not know for sure that
// we'll be using a Haskell main function.
//
// NOTE: This function is marked as _noreturn_ in Main.h
int hs_main ( int argc, char *argv[], // program args
StgClosure *main_closure, // closure for Main.main
RtsConfig rts_config) // RTS configuration
{
int exit_status;
SchedulerStatus status;
// See Note: [Windows Unicode Arguments] in rts/RtsFlags.c
#if defined(mingw32_HOST_OS)
{
argv = getUTF8Args(&argc);
}
#endif
hs_init_ghc(&argc, &argv, rts_config);
BEGIN_WINDOWS_VEH_HANDLER
// kick off the computation by creating the main thread with a pointer
// to mainIO_closure representing the computation of the overall program;
// then enter the scheduler with this thread and off we go;
//
// in a parallel setup, where we have many instances of this code
// running on different PEs, we should do this only for the main PE
// (IAmMainThread is set in startupHaskell)
// ToDo: want to start with a larger stack size
{
Capability *cap = rts_lock();
rts_evalLazyIO(&cap, main_closure, NULL);
status = rts_getSchedStatus(cap);
rts_unlock(cap);
}
// check the status of the entire Haskell computation
switch (status) {
case Killed:
errorBelch("main thread exited (uncaught exception)");
exit_status = EXIT_KILLED;
break;
case Interrupted:
errorBelch("interrupted");
exit_status = EXIT_INTERRUPTED;
break;
case HeapExhausted:
exit_status = EXIT_HEAPOVERFLOW;
break;
case Success:
exit_status = EXIT_SUCCESS;
break;
default:
barf("main thread completed with invalid status");
}
END_WINDOWS_VEH_HANDLER
shutdownHaskellAndExit(exit_status, 0 /* !fastExit */);
// No code beyond this point. Dead code elimination will remove it
}
# endif /* BATCH_MODE */
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