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/*

 * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.

 *

 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED

 * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.

 *

 * Permission is hereby granted to use or copy this program

 * for any purpose,  provided the above notices are retained on all copies.

 * Permission to modify the code and to distribute modified code is granted,

 * provided the above notices are retained, and a notice that the code was

 * modified is included with the above copyright notice.

 */

# include "private/gc_priv.h"

# ifdef PCR

/*

 * Note that POSIX PCR requires an ANSI C compiler.  Hence we are allowed

 * to make the same assumption here.

 * We wrap all of the allocator functions to avoid questions of

 * compatibility between the prototyped and nonprototyped versions of the f

 */

# include "config/PCR_StdTypes.h"

# include "mm/PCR_MM.h"

# include <errno.h>

# define MY_MAGIC 17L

# define MY_DEBUGMAGIC 42L

void * GC_AllocProc(size_t size, PCR_Bool ptrFree, PCR_Bool clear )

{

    if (ptrFree) {

        void * result = (void *)GC_malloc_atomic(size);

        if (clear && result != 0) BZERO(result, size);

        return(result);

    } else {

        return((void *)GC_malloc(size));

    }

}

void * GC_DebugAllocProc(size_t size, PCR_Bool ptrFree, PCR_Bool clear )

{

    if (ptrFree) {

        void * result = (void *)GC_debug_malloc_atomic(size, __FILE__,

                                                             __LINE__);

        if (clear && result != 0) BZERO(result, size);

        return(result);

    } else {

        return((void *)GC_debug_malloc(size, __FILE__, __LINE__));

    }

}

# define GC_ReallocProc GC_realloc

void * GC_DebugReallocProc(void * old_object, size_t new_size_in_bytes)

{

    return(GC_debug_realloc(old_object, new_size_in_bytes, __FILE__, __LINE__));

}

# define GC_FreeProc GC_free

# define GC_DebugFreeProc GC_debug_free

typedef struct {

  PCR_ERes (*ed_proc)(void *p, size_t size, PCR_Any data);

  GC_bool ed_pointerfree;

  PCR_ERes ed_fail_code;

  PCR_Any ed_client_data;

} enumerate_data;

void GC_enumerate_block(h, ed)

register struct hblk *h;

enumerate_data * ed;

{

    register hdr * hhdr;

    register int sz;

    word *p;

    word * lim;

    hhdr = HDR(h);

    sz = hhdr -> hb_sz;

    if (sz >= 0 && ed -> ed_pointerfree

        || sz <= 0 && !(ed -> ed_pointerfree)) return;

    if (sz < 0) sz = -sz;

    lim = (word *)(h+1) - sz;

    p = (word *)h;

    do {

        if (PCR_ERes_IsErr(ed -> ed_fail_code)) return;

        ed -> ed_fail_code =

            (*(ed -> ed_proc))(p, WORDS_TO_BYTES(sz), ed -> ed_client_data);

        p+= sz;

    } while (p <= lim);

}

struct PCR_MM_ProcsRep * GC_old_allocator = 0;

PCR_ERes GC_EnumerateProc(

    PCR_Bool ptrFree,

    PCR_ERes (*proc)(void *p, size_t size, PCR_Any data),

    PCR_Any data

)

{

    enumerate_data ed;

    ed.ed_proc = proc;

    ed.ed_pointerfree = ptrFree;

    ed.ed_fail_code = PCR_ERes_okay;

    ed.ed_client_data = data;

    GC_apply_to_all_blocks(GC_enumerate_block, &ed);

    if (ed.ed_fail_code != PCR_ERes_okay) {

        return(ed.ed_fail_code);

    } else {

        /* Also enumerate objects allocated by my predecessors */

        return((*(GC_old_allocator->mmp_enumerate))(ptrFree, proc, data));

    }

}

void GC_DummyFreeProc(void *p) {}

void GC_DummyShutdownProc(void) {}

struct PCR_MM_ProcsRep GC_Rep = {

        MY_MAGIC,

        GC_AllocProc,

        GC_ReallocProc,

        GC_DummyFreeProc,       /* mmp_free */

        GC_FreeProc,            /* mmp_unsafeFree */

        GC_EnumerateProc,

        GC_DummyShutdownProc    /* mmp_shutdown */

};

struct PCR_MM_ProcsRep GC_DebugRep = {

        MY_DEBUGMAGIC,

        GC_DebugAllocProc,

        GC_DebugReallocProc,

        GC_DummyFreeProc,       /* mmp_free */

        GC_DebugFreeProc,               /* mmp_unsafeFree */

        GC_EnumerateProc,

        GC_DummyShutdownProc    /* mmp_shutdown */

};

GC_bool GC_use_debug = 0;

void GC_pcr_install()

{

    PCR_MM_Install((GC_use_debug? &GC_DebugRep : &GC_Rep), &GC_old_allocator);

}

PCR_ERes

PCR_GC_Setup(void)

{

    return PCR_ERes_okay;

}

PCR_ERes

PCR_GC_Run(void)

{

    if( !PCR_Base_TestPCRArg("-nogc") ) {

        GC_quiet = ( PCR_Base_TestPCRArg("-gctrace") ? 0 : 1 );

        GC_use_debug = (GC_bool)PCR_Base_TestPCRArg("-debug_alloc");

        GC_init();

        if( !PCR_Base_TestPCRArg("-nogc_incremental") ) {

            /*

             * awful hack to test whether VD is implemented ...

             */

            if( PCR_VD_Start( 0, NIL, 0) != PCR_ERes_FromErr(ENOSYS) ) {

                GC_enable_incremental();

            }

        }

    }

    return PCR_ERes_okay;

}

void GC_push_thread_structures(void)

{

    /* PCR doesn't work unless static roots are pushed.  Can't get here. */

    ABORT("In GC_push_thread_structures()");

}

# endif