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***************************************************************************
TWO SPACE COLLECTION
***************************************************************************
\begin{code}
#if defined(GC2s)
#define SCAV_REG_MAP
#include "SMinternal.h"
#include "SMcopying.h"
#include "SMextn.h"
REGDUMP(ScavRegDump);
I_ semispace = 0; /* 0 or 1 */
semispaceData semispaceInfo[2]
= {{0,0}, {0,0}};
P_ heap_space = 0; /* Address of first word of slab
of memory allocated for heap */
P_ hp_start; /* Value of Hp when reduction was resumed */
I_ initHeap( sm )
smInfo *sm;
{
if (heap_space == 0) { /* allocates if it doesn't already exist */
I_ semispaceSize = SM_word_heap_size / 2;
/* Allocate the roots space */
sm->roots = (P_ *) xmalloc( SM_MAXROOTS * sizeof(W_) );
/* Allocate the heap */
heap_space = (P_) xmalloc((SM_word_heap_size + EXTRA_HEAP_WORDS) * sizeof(W_));
/* Define the semi-spaces */
semispaceInfo[0].base = HEAP_FRAME_BASE(heap_space, semispaceSize);
semispaceInfo[1].base = HEAP_FRAME_BASE(heap_space + semispaceSize, semispaceSize);
semispaceInfo[0].lim = HEAP_FRAME_LIMIT(heap_space, semispaceSize);
semispaceInfo[1].lim = HEAP_FRAME_LIMIT(heap_space + semispaceSize, semispaceSize);
stat_init("TWOSPACE",
" No of Roots Caf Caf Astk Bstk",
"Astk Bstk Reg No bytes bytes bytes");
}
/* Initialise heap pointer and limit */
sm->hp = hp_start = semispaceInfo[semispace].base - 1;
sm->hardHpOverflowSize = 0;
if (SM_alloc_size) {
sm->hplim = sm->hp + SM_alloc_size;
SM_alloc_min = 0; /* No min; alloc size specified */
if (sm->hplim > semispaceInfo[semispace].lim) {
fprintf(stderr, "Not enough heap for requested alloc size\n");
return -1;
}
} else {
sm->hplim = semispaceInfo[semispace].lim;
}
#if defined(FORCE_GC)
if (force_GC) {
if (sm->hplim > sm->hp + GCInterval) {
sm->hplim = sm->hp + GCInterval;
}
else {
force_GC = 0; /* forcing GC has no effect, as semi-space is smaller than GCInterval */
}
}
#endif /* FORCE_GC */
#if defined(LIFE_PROFILE)
sm->hplim = sm->hp + ((sm->hplim - sm->hp) / 2); /* space for HpLim incr */
if (do_life_prof) {
sm->hplim = sm->hp + LifeInterval;
}
#endif /* LIFE_PROFILE */
sm->CAFlist = NULL;
#ifndef PAR
initExtensions( sm );
#endif /* !PAR */
if (SM_trace) {
fprintf(stderr, "TWO SPACE Heap: 0base, 0lim, 1base, 1lim\n 0x%lx, 0x%lx, 0x%lx, 0x%lx\n",
(W_) semispaceInfo[0].base, (W_) semispaceInfo[0].lim,
(W_) semispaceInfo[1].base, (W_) semispaceInfo[1].lim);
fprintf(stderr, "TWO SPACE Initial: space %ld, base 0x%lx, lim 0x%lx\n hp 0x%lx, hplim 0x%lx, free %lu\n",
semispace,
(W_) semispaceInfo[semispace].base,
(W_) semispaceInfo[semispace].lim,
(W_) sm->hp, (W_) sm->hplim, (W_) (sm->hplim - sm->hp) * sizeof(W_));
}
return 0;
}
I_
collectHeap(reqsize, sm, do_full_collection)
W_ reqsize;
smInfo *sm;
rtsBool do_full_collection; /* ignored */
{
#if defined(LIFE_PROFILE)
I_ next_interval; /* if doing profile */
#endif
I_ free_space, /* No of words of free space following GC */
alloc, /* Number of words allocated since last GC */
resident, /* Number of words remaining after GC */
extra_caf_words,/* Extra words referenced from CAFs */
caf_roots, /* Number of CAFs */
bstk_roots; /* Number of update frames on B stack */
fflush(stdout); /* Flush stdout at start of GC */
SAVE_REGS(&ScavRegDump); /* Save registers */
#if defined(LIFE_PROFILE)
if (do_life_prof) { life_profile_setup(); }
#endif /* LIFE_PROFILE */
#if defined(USE_COST_CENTRES)
if (interval_expired) { heap_profile_setup(); }
#endif /* USE_COST_CENTRES */
if (SM_trace)
fprintf(stderr, "TWO SPACE Start: space %ld, base 0x%lx, lim 0x%lx\n hp 0x%lx, hplim 0x%lx, req %lu\n",
semispace, (W_) semispaceInfo[semispace].base,
(W_) semispaceInfo[semispace].lim,
(W_) sm->hp, (W_) sm->hplim, reqsize * sizeof(W_));
alloc = sm->hp - hp_start;
stat_startGC(alloc);
/* Set Up For Collecting:
- Flip Spaces
- Set ToHp to point one below bottom of to-space (last allocated)
- Set CAFs to Evac & Upd
*/
semispace = NEXT_SEMI_SPACE(semispace);
ToHp = semispaceInfo[semispace].base - 1;
Scav = semispaceInfo[semispace].base;
SetCAFInfoTables( sm->CAFlist );
#ifdef PAR
EvacuateLocalGAs(rtsTrue);
#else
evacSPTable( sm );
#endif /* PAR */
EvacuateRoots( sm->roots, sm->rootno );
#ifdef CONCURRENT
EvacuateSparks();
#endif
#ifndef PAR
EvacuateAStack( MAIN_SpA, stackInfo.botA );
EvacuateBStack( MAIN_SuB, stackInfo.botB, &bstk_roots );
#endif /* !PAR */
Scavenge();
EvacAndScavengeCAFs( sm->CAFlist, &extra_caf_words, &caf_roots );
#ifdef PAR
RebuildGAtables(rtsTrue);
#else
reportDeadMallocPtrs(sm->MallocPtrList, NULL, &(sm->MallocPtrList) );
#endif /* PAR */
/* TIDY UP AND RETURN */
sm->hp = hp_start = ToHp; /* Last allocated word */
resident = sm->hp - (semispaceInfo[semispace].base - 1);
DO_MAX_RESIDENCY(resident); /* stats only */
if (SM_alloc_size) {
sm->hplim = sm->hp + SM_alloc_size;
if (sm->hplim > semispaceInfo[semispace].lim) {
free_space = 0;
} else {
free_space = SM_alloc_size;
}
} else {
sm->hplim = semispaceInfo[semispace].lim;
free_space = sm->hplim - sm->hp;
}
if (SM_stats_verbose) {
char comment_str[BIG_STRING_LEN];
#ifndef PAR
sprintf(comment_str, "%4u %4ld %3ld %3ld %6lu %6lu %6lu",
(SUBTRACT_A_STK(MAIN_SpA, stackInfo.botA) + 1),
bstk_roots, sm->rootno,
caf_roots, extra_caf_words*sizeof(W_),
(SUBTRACT_A_STK(MAIN_SpA, stackInfo.botA) + 1)*sizeof(W_),
(SUBTRACT_B_STK(MAIN_SpB, stackInfo.botB) + 1)*sizeof(W_));
#else
/* ToDo: come up with some interesting statistics for the parallel world */
sprintf(comment_str, "%4u %4ld %3ld %3ld %6lu %6lu %6lu",
0, 0, sm->rootno, caf_roots, extra_caf_words*sizeof(W_), 0, 0);
#endif
#if defined(LIFE_PROFILE)
if (do_life_prof) {
strcat(comment_str, " life");
}
#endif
#if defined(USE_COST_CENTRES)
if (interval_expired) {
strcat(comment_str, " prof");
}
#endif
stat_endGC(alloc, SM_word_heap_size, resident, comment_str);
} else {
stat_endGC(alloc, SM_word_heap_size, resident, "");
}
#if defined(LIFE_PROFILE)
free_space = free_space / 2; /* space for HpLim incr */
if (do_life_prof) {
next_interval = life_profile_done(alloc, reqsize);
free_space -= next_interval; /* ensure interval available */
}
#endif /* LIFE_PROFILE */
#if defined(USE_COST_CENTRES) || defined(GUM)
if (interval_expired) {
#if defined(USE_COST_CENTRES)
heap_profile_done();
#endif
report_cc_profiling(0 /*partial*/);
}
#endif /* USE_COST_CENTRES */
if (SM_trace)
fprintf(stderr, "TWO SPACE Done: space %ld, base 0x%lx, lim 0x%lx\n hp 0x%lx, hplim 0x%lx, free %lu\n",
semispace, (W_) semispaceInfo[semispace].base,
(W_) semispaceInfo[semispace].lim,
(W_) sm->hp, (W_) sm->hplim, (W_) (free_space * sizeof(W_)));
#ifdef DEBUG
/* To help flush out bugs, we trash the part of the heap from
which we're about to start allocating and all of the other semispace. */
TrashMem(sm->hp+1, sm->hplim);
TrashMem(semispaceInfo[NEXT_SEMI_SPACE(semispace)].base,
semispaceInfo[NEXT_SEMI_SPACE(semispace)].lim);
#endif /* DEBUG */
RESTORE_REGS(&ScavRegDump); /* Restore Registers */
if ( (SM_alloc_min > free_space) || (reqsize > free_space) ) {
return( GC_HARD_LIMIT_EXCEEDED ); /* Heap absolutely exhausted */
} else {
#if defined(FORCE_GC)
if (force_GC) {
if (sm->hplim > sm->hp + GCInterval) {
sm->hplim = sm->hp + GCInterval;
}
}
#endif /* FORCE_GC */
+
#if defined(LIFE_PROFILE)
/* space for HpLim incr */
sm->hplim = sm->hp + ((sm->hplim - sm->hp) / 2);
if (do_life_prof) {
/* set hplim for next life profile */
sm->hplim = sm->hp + next_interval;
}
#endif /* LIFE_PROFILE */
if (reqsize + sm->hardHpOverflowSize > free_space) {
return( GC_SOFT_LIMIT_EXCEEDED ); /* Heap nearly exhausted */
} else {
return( GC_SUCCESS ); /* Heap OK */
}
}
}
#endif /* GC2s */
\end{code}
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