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/*
allocation and garbage collection
. non-moving, precise mark and sweep collector
. pool-allocates small objects, keeps big objects on a simple list
*/
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "julia.h"
// with MEMDEBUG, every object is allocated explicitly with malloc, and
// filled with 0xbb before being freed.
// NOTE: needs to be defined in ios.c too, due to GC/IObuffer interaction
//#define MEMDEBUG
// MEMPROFILE prints pool summary statistics after every GC
// NOTE: define in ios.c too
//#define MEMPROFILE
// GCTIME prints time taken by each phase of GC
//#define GCTIME
// OBJPROFILE counts objects by type
//#define OBJPROFILE
#if defined(MEMDEBUG) || defined(MEMPROFILE)
# ifdef __LP64__
# define BVOFFS 4
# else
# define BVOFFS 4
# endif
#else
# ifdef __LP64__
# define BVOFFS 2
# else
# define BVOFFS 4
# endif
#endif
#define GC_PAGE_SZ (1536*sizeof(void*))//bytes
typedef struct _gcpage_t {
char data[GC_PAGE_SZ];
union {
struct _gcpage_t *next;
char _pad[8];
};
} gcpage_t;
typedef struct _gcval_t {
union {
struct _gcval_t *next;
uptrint_t flags;
uptrint_t data0; // overlapped
uptrint_t marked:1;
};
} gcval_t;
typedef struct _pool_t {
size_t osize;
gcpage_t *pages;
gcval_t *freelist;
} pool_t;
typedef struct _bigval_t {
struct _bigval_t *next;
#if defined(MEMDEBUG) || defined(MEMPROFILE)
union {
size_t sz;
#ifdef __LP64__
char _pad[16];
#endif
};
#endif
#ifndef __LP64__
# if defined(MEMDEBUG) || defined(MEMPROFILE)
char _pad2[4];
# else
char _pad2[8];
# endif
#endif
uptrint_t _pad3;
union {
uptrint_t flags;
uptrint_t marked:1;
char _data[1];
};
} bigval_t;
#define gc_marked(o) (((gcval_t*)(o))->marked)
#define gc_setmark(o) (((gcval_t*)(o))->marked=1)
#define gc_val_buf(o) ((gcval_t*)(((void**)(o))-1))
#define gc_setmark_buf(o) gc_setmark(gc_val_buf(o))
static bigval_t *big_objects = NULL;
static jl_mallocptr_t *malloc_ptrs = NULL;
static jl_mallocptr_t *malloc_ptrs_freelist = NULL;
#define N_POOLS 42
static pool_t norm_pools[N_POOLS];
static pool_t ephe_pools[N_POOLS];
static pool_t *pools = &norm_pools[0];
static size_t allocd_bytes = 0;
static const size_t collect_interval = 3200*1024*sizeof(void*);
static htable_t finalizer_table;
static arraylist_t to_finalize;
static arraylist_t preserved_values;
static arraylist_t weak_refs;
#ifdef OBJPROFILE
static htable_t obj_counts;
#endif
int jl_gc_n_preserved_values(void)
{
return preserved_values.len;
}
void jl_gc_preserve(jl_value_t *v)
{
arraylist_push(&preserved_values, (void*)v);
}
void jl_gc_unpreserve(void)
{
(void)arraylist_pop(&preserved_values);
}
DLLEXPORT jl_weakref_t *jl_gc_new_weakref(jl_value_t *value)
{
jl_weakref_t *wr = (jl_weakref_t*)alloc_2w();
wr->type = (jl_type_t*)jl_weakref_type;
wr->value = value;
arraylist_push(&weak_refs, wr);
return wr;
}
static void sweep_weak_refs(void)
{
size_t n=0, ndel=0, l=weak_refs.len;
jl_weakref_t *wr;
void **lst = weak_refs.items;
void *tmp;
#define SWAP_wr(a,b) (tmp=a,a=b,b=tmp,1)
if (l == 0)
return;
do {
wr = (jl_weakref_t*)lst[n];
if (gc_marked(wr)) {
// weakref itself is alive
if (!gc_marked(wr->value))
wr->value = (jl_value_t*)jl_nothing;
n++;
}
else {
ndel++;
}
} while ((n < l-ndel) && SWAP_wr(lst[n],lst[n+ndel]));
weak_refs.len -= ndel;
}
static void schedule_finalization(void *o)
{
arraylist_push(&to_finalize, o);
}
static void run_finalizers(void)
{
void *o = NULL;
jl_function_t *f=NULL;
jl_value_t *ff=NULL;
JL_GC_PUSH(&o, &f, &ff);
while (to_finalize.len > 0) {
o = arraylist_pop(&to_finalize);
ff = (jl_value_t*)ptrhash_get(&finalizer_table, o);
assert(ff != HT_NOTFOUND);
ptrhash_remove(&finalizer_table, o);
while (jl_is_tuple(ff)) {
f = (jl_function_t*)jl_t0(ff);
assert(jl_is_function(f));
JL_TRY {
jl_apply(f, (jl_value_t**)&o, 1);
}
JL_CATCH {
}
ff = jl_t1(ff);
}
f = (jl_function_t*)ff;
assert(jl_is_function(f));
jl_apply(f, (jl_value_t**)&o, 1);
}
JL_GC_POP();
}
void jl_gc_add_finalizer(jl_value_t *v, jl_function_t *f)
{
jl_value_t **bp = (jl_value_t**)ptrhash_bp(&finalizer_table, v);
if (*bp == HT_NOTFOUND) {
*bp = (jl_value_t*)f;
}
else {
*bp = (jl_value_t*)jl_tuple2((jl_value_t*)f, *bp);
}
}
static int szclass(size_t sz)
{
#ifndef __LP64__
if (sz <= 8) return 0;
#endif
if (sz <= 56) return ((sz+3)/4) - 2;
if (sz <= 96) return ((sz+7)/8) + 5;
if (sz <= 512) {
if (sz <= 256) return ((sz+15)-112)/16 + 18;
else return ((sz+31)-288)/32 + 28;
}
if (sz <= 1024) return ((sz+127)-640)/128 + 36;
if (sz <= 1536) return 40;
return 41;
}
static void *alloc_big(size_t sz)
{
if (allocd_bytes > collect_interval) {
jl_gc_collect();
}
sz = (sz+3) & -4;
allocd_bytes += sz;
size_t offs = BVOFFS*sizeof(void*);
if (sz + offs < offs) // overflow in adding offs, size was "negative"
jl_raise(jl_memory_exception);
bigval_t *v = (bigval_t*)malloc(sz + offs);
if (v == NULL)
jl_raise(jl_memory_exception);
#if defined(MEMDEBUG) || defined(MEMPROFILE)
v->sz = sz;
#endif
v->flags = 0;
v->next = big_objects;
big_objects = v;
return &v->_data[0];
}
static void sweep_big(void)
{
bigval_t *v = big_objects;
bigval_t **pv = &big_objects;
while (v != NULL) {
bigval_t *nxt = v->next;
if (v->marked) {
pv = &v->next;
v->marked = 0;
}
else {
*pv = nxt;
#ifdef MEMDEBUG
memset(v, 0xbb, v->sz+BVOFFS*sizeof(void*));
#endif
free(v);
}
v = nxt;
}
}
jl_mallocptr_t *jl_gc_acquire_buffer(void *b)
{
jl_mallocptr_t *mp;
if (malloc_ptrs_freelist == NULL) {
mp = malloc(sizeof(jl_mallocptr_t));
}
else {
mp = malloc_ptrs_freelist;
malloc_ptrs_freelist = malloc_ptrs_freelist->next;
}
mp->type = NULL;
mp->ptr = b;
mp->next = malloc_ptrs;
malloc_ptrs = mp;
return mp;
}
jl_mallocptr_t *jl_gc_managed_malloc(size_t sz)
{
if (allocd_bytes > collect_interval) {
jl_gc_collect();
}
sz = (sz+3) & -4;
void *b = malloc(sz);
if (b == NULL)
jl_raise(jl_memory_exception);
allocd_bytes += sz;
return jl_gc_acquire_buffer(b);
}
static void sweep_malloc_ptrs(void)
{
jl_mallocptr_t *mp = malloc_ptrs;
jl_mallocptr_t **pmp = &malloc_ptrs;
while (mp != NULL) {
jl_mallocptr_t *nxt = mp->next;
if (((gcval_t*)mp)->marked) {
pmp = &mp->next;
((gcval_t*)mp)->marked = 0;
}
else {
*pmp = nxt;
if (mp->ptr)
free(mp->ptr);
mp->next = malloc_ptrs_freelist;
malloc_ptrs_freelist = mp;
}
mp = nxt;
}
}
static void add_page(pool_t *p)
{
gcpage_t *pg = malloc(sizeof(gcpage_t));
if (pg == NULL)
jl_raise(jl_memory_exception);
gcval_t *v = (gcval_t*)&pg->data[0];
char *lim = (char*)v + GC_PAGE_SZ - p->osize;
gcval_t *fl;
gcval_t **pfl = &fl;
while ((char*)v <= lim) {
*pfl = v;
pfl = &v->next;
v = (gcval_t*)((char*)v + p->osize);
}
// these statements are ordered so that interrupting after any of them
// leaves the system in a valid state
*pfl = p->freelist;
pg->next = p->pages;
p->pages = pg;
p->freelist = fl;
}
static inline void *pool_alloc(pool_t *p)
{
if (allocd_bytes > collect_interval) {
jl_gc_collect();
}
if (p->freelist == NULL) {
add_page(p);
}
assert(p->freelist != NULL);
gcval_t *v = p->freelist;
p->freelist = p->freelist->next;
v->flags = 0;
return v;
}
static void sweep_pool(pool_t *p)
{
//int empty;
int freedall;
gcval_t **prev_pfl;
gcval_t *v;
gcpage_t *pg = p->pages;
gcpage_t **ppg = &p->pages;
gcval_t **pfl = &p->freelist;
size_t osize = p->osize;
while (pg != NULL) {
v = (gcval_t*)&pg->data[0];
char *lim = (char*)v + GC_PAGE_SZ - osize;
//empty = 1;
freedall = 1;
prev_pfl = pfl;
while ((char*)v <= lim) {
if (!v->marked) {
*pfl = v;
pfl = &v->next;
}
else {
v->marked = 0;
freedall = 0;
}
v = (gcval_t*)((char*)v + osize);
}
gcpage_t *nextpg = pg->next;
// lazy version: (empty) if the whole page was already unused, free it
// eager version: (freedall) free page as soon as possible
// the eager one uses less memory.
if (freedall) {
pfl = prev_pfl;
*ppg = nextpg;
#ifdef MEMDEBUG
memset(pg, 0xbb, sizeof(gcpage_t));
#endif
free(pg);
}
else {
ppg = &pg->next;
}
pg = nextpg;
}
*pfl = NULL;
}
extern void jl_unmark_symbols(void);
static void gc_sweep(void)
{
sweep_big();
sweep_malloc_ptrs();
int i;
for(i=0; i < N_POOLS; i++) {
sweep_pool(&norm_pools[i]);
sweep_pool(&ephe_pools[i]);
}
jl_unmark_symbols();
}
#define GC_Markval(v) gc_markval_((jl_value_t*)(v))
static void gc_markval_(jl_value_t *v);
void jl_gc_markval(jl_value_t *v)
{
gc_markval_(v);
}
static void gc_mark_stack(jl_gcframe_t *s, ptrint_t offset)
{
while (s != NULL) {
s = (jl_gcframe_t*)((char*)s + offset);
size_t i;
jl_value_t ***rts = (jl_value_t***)((char*)s->roots + offset);
if (s->indirect) {
size_t nr = s->nroots;
for(i=0; i < nr; i++) {
jl_value_t **ptr = (jl_value_t**)((char*)rts[i] + offset);
if (*ptr != NULL)
GC_Markval(*ptr);
}
}
else {
size_t nr = s->nroots;
for(i=0; i < nr; i++) {
if (rts[i] != NULL)
GC_Markval(rts[i]);
}
}
s = s->prev;
}
}
static void gc_mark_module(jl_module_t *m)
{
size_t i;
void **table = m->bindings.table;
for(i=1; i < m->bindings.size; i+=2) {
if (table[i] != HT_NOTFOUND) {
jl_binding_t *b = (jl_binding_t*)table[i];
gc_setmark_buf(b);
if (b->value != NULL)
GC_Markval(b->value);
GC_Markval(b->type);
}
}
}
#define gc_typeof(v) ((jl_value_t*)(((uptrint_t)jl_typeof(v))&~1UL))
// for chasing down unwanted references
/*
static jl_value_t *lookforme = NULL;
DLLEXPORT void jl_gc_lookfor(jl_value_t *v) { lookforme = v; }
*/
static void gc_markval_(jl_value_t *v)
{
gc_markval_top:
assert(v != NULL);
//assert(v != lookforme);
if (gc_marked(v)) return;
jl_value_t *vt = (jl_value_t*)jl_typeof(v);
#ifdef OBJPROFILE
void **bp = ptrhash_bp(&obj_counts, vt);
if (*bp == HT_NOTFOUND)
*bp = (void*)2;
else
(*((ptrint_t*)bp))++;
#endif
gc_setmark(v);
if (gc_typeof(vt) == (jl_value_t*)jl_bits_kind) return;
// some values have special representations
if (vt == (jl_value_t*)jl_tuple_type) {
size_t l = jl_tuple_len(v);
jl_value_t **data = ((jl_tuple_t*)v)->data;
for(size_t i=0; i < l; i++) {
jl_value_t *elt = data[i];
if (elt != NULL)
GC_Markval(elt);
}
}
else if (((jl_struct_type_t*)(vt))->name == jl_array_typename) {
jl_array_t *a = (jl_array_t*)v;
char *data = a->data;
if (data == NULL) return;
int ndims = jl_array_ndims(a);
void *data_area = jl_array_inline_data_area(a);
char *data0 = data;
if (ndims == 1) data0 -= a->offset*a->elsize;
if (data0 != data_area) {
jl_value_t *owner = *(jl_value_t**)data_area;
if (gc_typeof(owner) == 0) {
// jl_mallocptr_t
if (gc_marked(owner))
return;
gc_setmark(owner);
}
else {
// an array
v = owner;
if (v != (jl_value_t*)a) goto gc_markval_top;
}
}
if (a->ptrarray) {
size_t l = a->length;
if (l > 0) {
for(size_t i=0; i < l-1; i++) {
jl_value_t *elt = ((jl_value_t**)data)[i];
if (elt != NULL) GC_Markval(elt);
}
v = ((jl_value_t**)data)[l-1];
if (v != NULL) goto gc_markval_top;
}
}
}
else if (vt == (jl_value_t*)jl_module_type) {
gc_mark_module((jl_module_t*)v);
}
else if (vt == (jl_value_t*)jl_task_type) {
jl_task_t *ta = (jl_task_t*)v;
GC_Markval(ta->on_exit);
GC_Markval(ta->tls);
if (ta->start)
GC_Markval(ta->start);
if (ta->result)
GC_Markval(ta->result);
GC_Markval(ta->state.eh_task);
if (ta->stkbuf != NULL)
gc_setmark_buf(ta->stkbuf);
#ifdef COPY_STACKS
ptrint_t offset;
if (ta == jl_current_task) {
offset = 0;
gc_mark_stack(jl_pgcstack, offset);
}
else {
offset = ta->stkbuf - (ta->stackbase-ta->ssize);
gc_mark_stack(ta->state.gcstack, offset);
}
jl_savestate_t *ss = &ta->state;
while (ss != NULL) {
GC_Markval(ss->ostream_obj);
ss = ss->prev;
if (ss != NULL)
ss = (jl_savestate_t*)((char*)ss + offset);
}
#else
gc_mark_stack(ta->state.gcstack, 0);
jl_savestate_t *ss = &ta->state;
while (ss != NULL) {
GC_Markval(ss->ostream_obj);
ss = ss->prev;
}
#endif
}
else if (vt == (jl_value_t*)jl_weakref_type) {
// don't mark contents
}
else {
int nf = (int)jl_tuple_len(((jl_struct_type_t*)vt)->names);
if (nf > 0) {
int i = 0;
if (vt == (jl_value_t*)jl_struct_kind ||
vt == (jl_value_t*)jl_function_type) {
i++; // skip fptr field
}
for(; i < nf-1; i++) {
jl_value_t *fld = ((jl_value_t**)v)[i+1];
if (fld)
GC_Markval(fld);
}
v = ((jl_value_t**)v)[i+1];
if (v)
goto gc_markval_top;
}
}
}
void jl_mark_box_caches(void);
extern jl_value_t * volatile jl_task_arg_in_transit;
#ifdef GCTIME
double clock_now(void);
#endif
#include "julia.h"
static void gc_mark_uv_handle(uv_handle_t *handle, void *arg)
{
if(handle->data) {
GC_Markval((jl_value_t*)(handle->data));
}
}
static void gc_mark_uv_state(uv_loop_t *loop)
{
uv_walk(loop,gc_mark_uv_handle,0);
}
static void gc_mark(void)
{
// mark all roots
// active tasks
GC_Markval(jl_root_task);
GC_Markval(jl_current_task);
// modules
GC_Markval(jl_root_module);
GC_Markval(jl_current_module);
// invisible builtin values
if (jl_an_empty_cell) GC_Markval(jl_an_empty_cell);
GC_Markval(jl_exception_in_transit);
GC_Markval(jl_task_arg_in_transit);
GC_Markval(jl_unprotect_stack_func);
GC_Markval(jl_bottom_func);
GC_Markval(jl_typetype_type);
// constants
GC_Markval(jl_null);
GC_Markval(jl_true);
GC_Markval(jl_false);
// libuv loops
gc_mark_uv_state(jl_global_event_loop());
gc_mark_uv_state(jl_local_event_loop());
jl_mark_box_caches();
size_t i;
// stuff randomly preserved
for(i=0; i < preserved_values.len; i++) {
GC_Markval((jl_value_t*)preserved_values.items[i]);
}
// objects currently being finalized
for(i=0; i < to_finalize.len; i++) {
GC_Markval(to_finalize.items[i]);
}
// find unmarked objects that need to be finalized.
// this must happen last.
for(i=0; i < finalizer_table.size; i+=2) {
if (finalizer_table.table[i+1] != HT_NOTFOUND) {
jl_value_t *v = finalizer_table.table[i];
if (!gc_marked(v)) {
GC_Markval(v);
schedule_finalization(v);
}
GC_Markval(finalizer_table.table[i+1]);
}
}
}
static int is_gc_enabled = 1;
DLLEXPORT void jl_gc_enable(void) { is_gc_enabled = 1; }
DLLEXPORT void jl_gc_disable(void) { is_gc_enabled = 0; }
DLLEXPORT int jl_gc_is_enabled(void) { return is_gc_enabled; }
void jl_gc_ephemeral_on(void) { pools = &ephe_pools[0]; }
void jl_gc_ephemeral_off(void) { pools = &norm_pools[0]; }
#if defined(MEMPROFILE)
static void all_pool_stats(void);
static void big_obj_stats(void);
#endif
#ifdef OBJPROFILE
static void print_obj_profile(void)
{
jl_value_t *errstream = jl_stderr_obj();
for(int i=0; i < obj_counts.size; i+=2) {
if (obj_counts.table[i+1] != HT_NOTFOUND) {
ios_printf(ios_stderr, "%d ", obj_counts.table[i+1]-1);
jl_show(errstream, obj_counts.table[i]);
ios_printf(ios_stderr, "\n");
}
}
}
#endif
void jl_gc_collect(void)
{
allocd_bytes = 0;
if (is_gc_enabled) {
JL_SIGATOMIC_BEGIN();
#ifdef GCTIME
double t0 = clock_now();
#endif
gc_mark();
#ifdef GCTIME
JL_PRINTF(JL_STDERR, "mark time %.3f ms\n", (clock_now()-t0)*1000);
#endif
#if defined(MEMPROFILE)
all_pool_stats();
big_obj_stats();
#endif
#ifdef GCTIME
t0 = clock_now();
#endif
sweep_weak_refs();
gc_sweep();
#ifdef GCTIME
JL_PRINTF(JL_STDERR, "sweep time %.3f ms\n", (clock_now()-t0)*1000);
#endif
run_finalizers();
JL_SIGATOMIC_END();
#ifdef OBJPROFILE
print_obj_profile();
htable_reset(&obj_counts, 0);
#endif
}
}
void *allocb(size_t sz)
{
void *b;
sz += sizeof(void*);
#ifdef MEMDEBUG
b = alloc_big(sz);
#else
if (sz > 2048) {
b = alloc_big(sz);
}
else {
allocd_bytes += sz;
b = pool_alloc(&pools[szclass(sz)]);
}
#endif
return (void*)((void**)b + 1);
}
void *allocobj(size_t sz)
{
#ifdef MEMDEBUG
return alloc_big(sz);
#endif
if (sz > 2048)
return alloc_big(sz);
allocd_bytes += sz;
return pool_alloc(&pools[szclass(sz)]);
}
void *alloc_2w(void)
{
#ifdef MEMDEBUG
return alloc_big(2*sizeof(void*));
#endif
allocd_bytes += (2*sizeof(void*));
#ifdef __LP64__
return pool_alloc(&pools[2]);
#else
return pool_alloc(&pools[0]);
#endif
}
void *alloc_3w(void)
{
#ifdef MEMDEBUG
return alloc_big(3*sizeof(void*));
#endif
allocd_bytes += (3*sizeof(void*));
#ifdef __LP64__
return pool_alloc(&pools[4]);
#else
return pool_alloc(&pools[1]);
#endif
}
void *alloc_4w(void)
{
#ifdef MEMDEBUG
return alloc_big(4*sizeof(void*));
#endif
allocd_bytes += (4*sizeof(void*));
#ifdef __LP64__
return pool_alloc(&pools[6]);
#else
return pool_alloc(&pools[2]);
#endif
}
void jl_gc_init(void)
{
int szc[N_POOLS] = { 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56,
64, 72, 80, 88, 96, //#=18
112, 128, 144, 160, 176, 192, 208, 224, 240, 256,
288, 320, 352, 384, 416, 448, 480, 512,
640, 768, 896, 1024,
1536, 2048 };
int i;
for(i=0; i < N_POOLS; i++) {
norm_pools[i].osize = szc[i];
norm_pools[i].pages = NULL;
norm_pools[i].freelist = NULL;
ephe_pools[i].osize = szc[i];
ephe_pools[i].pages = NULL;
ephe_pools[i].freelist = NULL;
}
htable_new(&finalizer_table, 0);
arraylist_new(&to_finalize, 0);
arraylist_new(&preserved_values, 0);
arraylist_new(&weak_refs, 0);
#ifdef OBJPROFILE
htable_new(&obj_counts, 0);
#endif
}
#if defined(MEMPROFILE)
static size_t pool_stats(pool_t *p, size_t *pwaste)
{
gcval_t *v;
gcpage_t *pg = p->pages;
size_t osize = p->osize;
size_t nused=0, nfree=0, npgs=0;
while (pg != NULL) {
npgs++;
v = (gcval_t*)&pg->data[0];
char *lim = (char*)v + GC_PAGE_SZ - osize;
while ((char*)v <= lim) {
if (!v->marked) {
nfree++;
}
else {
nused++;
}
v = (gcval_t*)((char*)v + osize);
}
gcpage_t *nextpg = pg->next;
pg = nextpg;
}
*pwaste = npgs*GC_PAGE_SZ - (nused*p->osize);
JL_PRINTF(JL_STDOUT,
"%4d : %7d/%7d objects, %5d pages, %8d bytes, %8d waste\n",
p->osize,
nused,
nused+nfree,
npgs,
nused*p->osize,
*pwaste);
return nused*p->osize;
}
static void all_pool_stats(void)
{
int i;
size_t nb=0, w, tw=0, no=0, b;
for(i=0; i < N_POOLS; i++) {
b = pool_stats(&norm_pools[i], &w);
nb += b;
no += (b/norm_pools[i].osize);
tw += w;
b = pool_stats(&ephe_pools[i], &w);
nb += b;
no += (b/ephe_pools[i].osize);
tw += w;
}
JL_PRINTF(JL_STDOUT,
"%d objects, %d total allocated, %d total fragments\n",
no, nb, tw);
}
static void big_obj_stats(void)
{
bigval_t *v = big_objects;
size_t nused=0, nbytes=0;
while (v != NULL) {
if (v->marked) {
nused++;
nbytes += v->sz;
}
v = v->next;
}
JL_PRINTF(JL_STDOUT, "%d bytes in %d large objects\n", nbytes, nused);
}
#endif //MEMPROFILE
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