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pcr_interface.c    180 lines (156 with data), 4.8 kB

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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(struct hblk *h; enumerate_data * ed)
{
register hdr * hhdr;
register int sz;
ptr_t p;
ptr_t lim;
word descr;
# error This code was updated without testing.
# error and its precursor was clearly broken.
hhdr = HDR(h);
descr = hhdr -> hb_descr;
sz = hhdr -> hb_sz;
if (descr != 0 && ed -> ed_pointerfree
|| descr == 0 && !(ed -> ed_pointerfree)) return;
lim = (ptr_t)(h+1) - sz;
p = (ptr_t)h;
do {
if (PCR_ERes_IsErr(ed -> ed_fail_code)) return;
ed -> ed_fail_code =
(*(ed -> ed_proc))(p, 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