picrin/extlib/benz/gc.c

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/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
union header {
struct {
union header *ptr;
size_t size;
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char mark;
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} s;
long alignment[2];
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};
struct heap_page {
union header *basep, *endp;
struct heap_page *next;
};
struct pic_heap {
union header base, *freep;
struct heap_page *pages;
};
static void
heap_init(struct pic_heap *heap)
{
heap->base.s.ptr = &heap->base;
heap->base.s.size = 0; /* not 1, since it must never be used for allocation */
heap->base.s.mark = PIC_GC_UNMARK;
heap->freep = &heap->base;
heap->pages = NULL;
#if GC_DEBUG
printf("freep = %p\n", (void *)heap->freep);
#endif
}
struct pic_heap *
pic_heap_open(pic_state *pic)
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{
struct pic_heap *heap;
heap = pic_calloc(pic, 1, sizeof(struct pic_heap));
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heap_init(heap);
return heap;
}
void
pic_heap_close(pic_state *pic, struct pic_heap *heap)
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{
struct heap_page *page;
while (heap->pages) {
page = heap->pages;
heap->pages = heap->pages->next;
pic_free(pic, page);
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}
}
static void gc_free(pic_state *, union header *);
static void
add_heap_page(pic_state *pic)
{
union header *up, *np;
struct heap_page *page;
size_t nu;
#if GC_DEBUG
puts("adding heap page!");
#endif
nu = (PIC_HEAP_PAGE_SIZE + sizeof(union header) - 1) / sizeof(union header) + 1;
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up = pic_calloc(pic, 1 + nu + 1, sizeof(union header));
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up->s.size = nu + 1;
up->s.mark = PIC_GC_UNMARK;
gc_free(pic, up);
np = up + 1;
np->s.size = nu;
np->s.ptr = up->s.ptr;
up->s.size = 1;
up->s.ptr = np;
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page = pic_malloc(pic, sizeof(struct heap_page));
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page->basep = up;
page->endp = up + nu + 1;
page->next = pic->heap->pages;
pic->heap->pages = page;
}
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#if PIC_ENABLE_LIBC
void *
pic_default_allocf(void *ptr, size_t size)
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{
if (size == 0) {
if (ptr) {
free(ptr);
}
return NULL;
}
if (ptr) {
return realloc(ptr, size);
} else {
return malloc(size);
}
}
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#endif
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void *
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pic_malloc(pic_state *pic, size_t size)
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{
void *ptr;
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ptr = pic->allocf(NULL, size);
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if (ptr == NULL && size > 0) {
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pic_panic(pic, "memory exhausted");
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}
return ptr;
}
void *
pic_realloc(pic_state *pic, void *ptr, size_t size)
{
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ptr = pic->allocf(ptr, size);
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if (ptr == NULL && size > 0) {
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pic_panic(pic, "memory exhausted");
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}
return ptr;
}
void *
pic_calloc(pic_state *pic, size_t count, size_t size)
{
void *ptr;
size *= count;
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ptr = pic->allocf(NULL, size);
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if (ptr == NULL && size > 0) {
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pic_panic(pic, "memory exhausted");
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}
memset(ptr, 0, size);
return ptr;
}
void
pic_free(pic_state *pic, void *ptr)
{
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pic->allocf(ptr, 0);
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}
static void
gc_protect(pic_state *pic, struct pic_object *obj)
{
if (pic->arena_idx >= pic->arena_size) {
pic->arena_size = pic->arena_size * 2 + 1;
pic->arena = pic_realloc(pic, pic->arena, sizeof(struct pic_object *) * pic->arena_size);
}
pic->arena[pic->arena_idx++] = obj;
}
pic_value
pic_gc_protect(pic_state *pic, pic_value v)
{
struct pic_object *obj;
if (pic_vtype(v) != PIC_VTYPE_HEAP) {
return v;
}
obj = pic_obj_ptr(v);
gc_protect(pic, obj);
return v;
}
size_t
pic_gc_arena_preserve(pic_state *pic)
{
return pic->arena_idx;
}
void
pic_gc_arena_restore(pic_state *pic, size_t state)
{
pic->arena_idx = state;
}
static void *
gc_alloc(pic_state *pic, size_t size)
{
union header *freep, *p, *prevp;
size_t nunits;
#if GC_DEBUG
assert(size > 0);
#endif
nunits = (size + sizeof(union header) - 1) / sizeof(union header) + 1;
prevp = freep = pic->heap->freep;
for (p = prevp->s.ptr; ; prevp = p, p = p->s.ptr) {
if (p->s.size >= nunits)
break;
if (p == freep) {
return NULL;
}
}
#if GC_DEBUG
{
unsigned char *c;
size_t s, i, j;
if (p->s.size == nunits) {
c = (unsigned char *)(p + p->s.size - nunits + 1);
s = nunits - 1;
} else {
c = (unsigned char *)(p + p->s.size - nunits);
s = nunits;
}
for (i = 0; i < s; ++i) {
for (j = 0; j < sizeof(union header); ++j) {
assert(c[i * sizeof(union header) + j] == 0xAA);
}
}
}
#endif
if (p->s.size == nunits) {
prevp->s.ptr = p->s.ptr;
}
else {
p->s.size -= nunits;
p += p->s.size;
p->s.size = nunits;
}
pic->heap->freep = prevp;
p->s.mark = PIC_GC_UNMARK;
#if GC_DEBUG
memset(p+1, 0, sizeof(union header) * (nunits - 1));
p->s.ptr = (union header *)0xcafebabe;
#endif
return (void *)(p + 1);
}
static void
gc_free(pic_state *pic, union header *bp)
{
union header *freep, *p;
#if GC_DEBUG
assert(bp != NULL);
assert(bp->s.size > 1);
#endif
#if GC_DEBUG
memset(bp + 1, 0xAA, (bp->s.size - 1) * sizeof(union header));
#endif
freep = pic->heap->freep;
for (p = freep; ! (bp > p && bp < p->s.ptr); p = p->s.ptr) {
if (p >= p->s.ptr && (bp > p || bp < p->s.ptr)) {
break;
}
}
if (bp + bp->s.size == p->s.ptr) {
bp->s.size += p->s.ptr->s.size;
bp->s.ptr = p->s.ptr->s.ptr;
#if GC_DEBUG
memset(p->s.ptr, 0xAA, sizeof(union header));
#endif
}
else {
bp->s.ptr = p->s.ptr;
}
if (p + p->s.size == bp && p->s.size > 1) {
p->s.size += bp->s.size;
p->s.ptr = bp->s.ptr;
#if GC_DEBUG
memset(bp, 0xAA, sizeof(union header));
#endif
}
else {
p->s.ptr = bp;
}
pic->heap->freep = p;
}
static void gc_mark(pic_state *, pic_value);
static void gc_mark_object(pic_state *pic, struct pic_object *obj);
static bool
gc_is_marked(union header *p)
{
return p->s.mark == PIC_GC_MARK;
}
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static bool
gc_obj_is_marked(struct pic_object *obj)
{
union header *p;
p = ((union header *)obj) - 1;
return gc_is_marked(p);
}
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static bool
gc_value_need_mark(pic_value value)
{
return pic_obj_p(value) && (! gc_obj_is_marked(pic_obj_ptr(value)));
}
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static void
gc_unmark(union header *p)
{
p->s.mark = PIC_GC_UNMARK;
}
static void
gc_mark_object(pic_state *pic, struct pic_object *obj)
{
union header *p;
p = ((union header *)obj) - 1;
if (gc_is_marked(p))
return;
p->s.mark = PIC_GC_MARK;
switch (obj->tt) {
case PIC_TT_PAIR: {
gc_mark(pic, ((struct pic_pair *)obj)->car);
gc_mark(pic, ((struct pic_pair *)obj)->cdr);
break;
}
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case PIC_TT_CXT: {
struct pic_context *cxt = (struct pic_context *)obj;
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int i;
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for (i = 0; i < cxt->regc; ++i) {
gc_mark(pic, cxt->regs[i]);
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}
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if (cxt->up) {
gc_mark_object(pic, (struct pic_object *)cxt->up);
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}
break;
}
case PIC_TT_PROC: {
struct pic_proc *proc = (struct pic_proc *)obj;
if (pic_proc_irep_p(proc)) {
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gc_mark_object(pic, (struct pic_object *)proc->u.i.irep);
if (proc->u.i.cxt) {
gc_mark_object(pic, (struct pic_object *)proc->u.i.cxt);
}
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} else {
if (proc->u.f.env) {
gc_mark_object(pic, (struct pic_object *)proc->u.f.env);
}
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}
break;
}
case PIC_TT_PORT: {
break;
}
case PIC_TT_ERROR: {
struct pic_error *err = (struct pic_error *)obj;
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gc_mark_object(pic, (struct pic_object *)err->type);
gc_mark_object(pic, (struct pic_object *)err->msg);
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gc_mark(pic, err->irrs);
gc_mark_object(pic, (struct pic_object *)err->stack);
break;
}
case PIC_TT_STRING: {
break;
}
case PIC_TT_VECTOR: {
size_t i;
for (i = 0; i < ((struct pic_vector *)obj)->len; ++i) {
gc_mark(pic, ((struct pic_vector *)obj)->data[i]);
}
break;
}
case PIC_TT_BLOB: {
break;
}
case PIC_TT_ID: {
struct pic_id *id = (struct pic_id *)obj;
gc_mark(pic, id->var);
gc_mark_object(pic, (struct pic_object *)id->env);
break;
}
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case PIC_TT_ENV: {
struct pic_env *env = (struct pic_env *)obj;
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khash_t(env) *h = &env->map;
khiter_t it;
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if (env->up) {
gc_mark_object(pic, (struct pic_object *)env->up);
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}
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for (it = kh_begin(h); it != kh_end(h); ++it) {
if (kh_exist(h, it)) {
gc_mark_object(pic, kh_key(h, it));
gc_mark_object(pic, (struct pic_object *)kh_val(h, it));
}
}
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break;
}
case PIC_TT_LIB: {
struct pic_lib *lib = (struct pic_lib *)obj;
gc_mark(pic, lib->name);
gc_mark_object(pic, (struct pic_object *)lib->env);
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gc_mark_object(pic, (struct pic_object *)lib->exports);
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break;
}
case PIC_TT_IREP: {
struct pic_irep *irep = (struct pic_irep *)obj;
size_t i;
for (i = 0; i < irep->ilen; ++i) {
gc_mark_object(pic, (struct pic_object *)irep->irep[i]);
}
for (i = 0; i < irep->plen; ++i) {
gc_mark(pic, irep->pool[i]);
}
break;
}
case PIC_TT_DATA: {
struct pic_data *data = (struct pic_data *)obj;
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gc_mark_object(pic, (struct pic_object *)data->storage);
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if (data->type->mark) {
data->type->mark(pic, data->data, gc_mark);
}
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break;
}
case PIC_TT_DICT: {
struct pic_dict *dict = (struct pic_dict *)obj;
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pic_sym *sym;
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khiter_t it;
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pic_dict_for_each (sym, dict, it) {
gc_mark_object(pic, (struct pic_object *)sym);
gc_mark(pic, pic_dict_ref(pic, dict, sym));
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}
break;
}
case PIC_TT_RECORD: {
struct pic_record *rec = (struct pic_record *)obj;
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gc_mark_object(pic, (struct pic_object *)rec->data);
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break;
}
case PIC_TT_SYMBOL: {
break;
}
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case PIC_TT_REG: {
struct pic_reg *reg = (struct pic_reg *)obj;
reg->prev = pic->regs;
pic->regs = reg;
break;
}
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case PIC_TT_CP: {
struct pic_checkpoint *cp = (struct pic_checkpoint *)obj;
if (cp->prev) {
gc_mark_object(pic, (struct pic_object *)cp->prev);
}
if (cp->in) {
gc_mark_object(pic, (struct pic_object *)cp->in);
}
if (cp->out) {
gc_mark_object(pic, (struct pic_object *)cp->out);
}
break;
}
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case PIC_TT_BOX: {
struct pic_box *box = (struct pic_box *)obj;
gc_mark(pic, box->value);
break;
}
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case PIC_TT_NIL:
case PIC_TT_BOOL:
#if PIC_ENABLE_FLOAT
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case PIC_TT_FLOAT:
#endif
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case PIC_TT_INT:
case PIC_TT_CHAR:
case PIC_TT_EOF:
case PIC_TT_UNDEF:
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case PIC_TT_INVALID:
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pic_panic(pic, "logic flaw");
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}
}
static void
gc_mark(pic_state *pic, pic_value v)
{
struct pic_object *obj;
if (pic_vtype(v) != PIC_VTYPE_HEAP)
return;
obj = pic_obj_ptr(v);
gc_mark_object(pic, obj);
}
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#define M(x) gc_mark_object(pic, (struct pic_object *)pic->x)
static void
gc_mark_global_symbols(pic_state *pic)
{
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M(sQUOTE); M(sQUASIQUOTE); M(sUNQUOTE); M(sUNQUOTE_SPLICING);
M(sSYNTAX_QUOTE); M(sSYNTAX_QUASIQUOTE); M(sSYNTAX_UNQUOTE); M(sSYNTAX_UNQUOTE_SPLICING);
M(sDEFINE_LIBRARY); M(sIMPORT); M(sEXPORT); M(sCOND_EXPAND);
M(sCALL); M(sGREF); M(sLREF); M(sCREF);
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M(uDEFINE); M(uLAMBDA); M(uIF); M(uBEGIN); M(uQUOTE); M(uSETBANG); M(uDEFINE_MACRO);
M(uDEFINE_LIBRARY); M(uIMPORT); M(uEXPORT); M(uCOND_EXPAND);
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M(uCONS); M(uCAR); M(uCDR); M(uNILP); M(uSYMBOLP); M(uPAIRP);
M(uADD); M(uSUB); M(uMUL); M(uDIV); M(uEQ); M(uLT); M(uLE); M(uGT); M(uGE); M(uNOT);
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}
#define P(x) gc_mark(pic, pic->x)
static void
gc_mark_system_procedures(pic_state *pic)
{
P(pCONS);
P(pCAR);
P(pCDR);
P(pNILP);
P(pSYMBOLP);
P(pPAIRP);
P(pNOT);
P(pADD);
P(pSUB);
P(pMUL);
P(pDIV);
P(pEQ);
P(pLT);
P(pLE);
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P(pGT);
P(pGE);
}
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static void
gc_mark_phase(pic_state *pic)
{
pic_value *stack;
pic_callinfo *ci;
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struct pic_proc **xhandler;
size_t j;
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assert(pic->regs == NULL);
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/* checkpoint */
if (pic->cp) {
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gc_mark_object(pic, (struct pic_object *)pic->cp);
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}
/* stack */
for (stack = pic->stbase; stack != pic->sp; ++stack) {
gc_mark(pic, *stack);
}
/* callinfo */
for (ci = pic->ci; ci != pic->cibase; --ci) {
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if (ci->cxt) {
gc_mark_object(pic, (struct pic_object *)ci->cxt);
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}
}
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/* exception handlers */
for (xhandler = pic->xpbase; xhandler != pic->xp; ++xhandler) {
gc_mark_object(pic, (struct pic_object *)*xhandler);
}
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/* arena */
for (j = 0; j < pic->arena_idx; ++j) {
gc_mark_object(pic, pic->arena[j]);
}
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/* mark reserved symbols */
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gc_mark_global_symbols(pic);
/* mark system procedures */
gc_mark_system_procedures(pic);
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/* global variables */
if (pic->globals) {
gc_mark_object(pic, (struct pic_object *)pic->globals);
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}
/* macro objects */
if (pic->macros) {
gc_mark_object(pic, (struct pic_object *)pic->macros);
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}
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/* attribute table */
if (pic->attrs) {
gc_mark_object(pic, (struct pic_object *)pic->attrs);
}
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/* error object */
gc_mark(pic, pic->err);
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/* features */
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gc_mark(pic, pic->features);
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/* library table */
gc_mark(pic, pic->libs);
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/* parameter table */
gc_mark(pic, pic->ptable);
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/* registries */
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do {
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struct pic_object *key;
pic_value val;
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khiter_t it;
khash_t(reg) *h;
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struct pic_reg *reg;
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j = 0;
reg = pic->regs;
while (reg != NULL) {
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h = &reg->hash;
for (it = kh_begin(h); it != kh_end(h); ++it) {
if (! kh_exist(h, it))
continue;
key = kh_key(h, it);
val = kh_val(h, it);
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if (gc_obj_is_marked(key) && gc_value_need_mark(val)) {
gc_mark(pic, val);
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++j;
}
}
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reg = reg->prev;
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}
} while (j > 0);
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}
static void
gc_finalize_object(pic_state *pic, struct pic_object *obj)
{
#if GC_DEBUG
printf("* finalizing object: %s", pic_type_repr(pic_type(pic_obj_value(obj))));
// pic_debug(pic, pic_obj_value(obj));
puts("");
#endif
switch (obj->tt) {
case PIC_TT_PAIR: {
break;
}
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case PIC_TT_CXT: {
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break;
}
case PIC_TT_PROC: {
break;
}
case PIC_TT_VECTOR: {
pic_free(pic, ((struct pic_vector *)obj)->data);
break;
}
case PIC_TT_BLOB: {
pic_free(pic, ((struct pic_blob *)obj)->data);
break;
}
case PIC_TT_STRING: {
pic_rope_decref(pic, ((struct pic_string *)obj)->rope);
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break;
}
case PIC_TT_PORT: {
break;
}
case PIC_TT_ERROR: {
break;
}
case PIC_TT_ID: {
break;
}
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case PIC_TT_ENV: {
struct pic_env *env = (struct pic_env *)obj;
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kh_destroy(env, &env->map);
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break;
}
case PIC_TT_LIB: {
break;
}
case PIC_TT_IREP: {
struct pic_irep *irep = (struct pic_irep *)obj;
pic_free(pic, irep->code);
pic_free(pic, irep->irep);
pic_free(pic, irep->pool);
break;
}
case PIC_TT_DATA: {
struct pic_data *data = (struct pic_data *)obj;
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if (data->type->dtor) {
data->type->dtor(pic, data->data);
}
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break;
}
case PIC_TT_DICT: {
struct pic_dict *dict = (struct pic_dict *)obj;
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kh_destroy(dict, &dict->hash);
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break;
}
case PIC_TT_RECORD: {
break;
}
case PIC_TT_SYMBOL: {
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pic_sym *sym = (pic_sym *)obj;
pic_free(pic, (void *)sym->cstr);
break;
}
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case PIC_TT_REG: {
struct pic_reg *reg = (struct pic_reg *)obj;
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kh_destroy(reg, &reg->hash);
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break;
}
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case PIC_TT_CP: {
break;
}
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case PIC_TT_BOX: {
break;
}
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case PIC_TT_NIL:
case PIC_TT_BOOL:
#if PIC_ENABLE_FLOAT
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case PIC_TT_FLOAT:
#endif
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case PIC_TT_INT:
case PIC_TT_CHAR:
case PIC_TT_EOF:
case PIC_TT_UNDEF:
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case PIC_TT_INVALID:
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pic_panic(pic, "logic flaw");
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}
}
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static void
gc_sweep_symbols(pic_state *pic)
{
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khash_t(s) *h = &pic->syms;
khiter_t it;
pic_sym *sym;
for (it = kh_begin(h); it != kh_end(h); ++it) {
if (! kh_exist(h, it))
continue;
sym = kh_val(h, it);
if (! gc_obj_is_marked((struct pic_object *)sym)) {
kh_del(s, h, it);
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}
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}
}
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static void
gc_sweep_page(pic_state *pic, struct heap_page *page)
{
#if GC_DEBUG
static union header * const NIL = (union header *)0xdeadbeef;
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#else
static union header * const NIL = NULL;
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#endif
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union header *bp, *p, *s = NIL, *t = NIL;
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#if GC_DEBUG
int c = 0;
#endif
for (bp = page->basep; ; bp = bp->s.ptr) {
for (p = bp + bp->s.size; p != bp->s.ptr; p += p->s.size) {
if (p == page->endp) {
goto escape;
}
if (! gc_is_marked(p)) {
if (s == NIL) {
s = p;
}
else {
t->s.ptr = p;
}
t = p;
t->s.ptr = NIL; /* For dead objects we can safely reuse ptr field */
}
gc_unmark(p);
}
}
escape:
/* free! */
while (s != NIL) {
t = s->s.ptr;
gc_finalize_object(pic, (struct pic_object *)(s + 1));
gc_free(pic, s);
s = t;
#if GC_DEBUG
c++;
#endif
}
#if GC_DEBUG
printf("freed objects count: %d\n", c);
#endif
}
static void
gc_sweep_phase(pic_state *pic)
{
struct heap_page *page = pic->heap->pages;
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khiter_t it;
khash_t(reg) *h;
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/* registries */
while (pic->regs != NULL) {
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h = &pic->regs->hash;
for (it = kh_begin(h); it != kh_end(h); ++it) {
if (! kh_exist(h, it))
continue;
if (! gc_obj_is_marked(kh_key(h, it))) {
kh_del(reg, h, it);
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}
}
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pic->regs = pic->regs->prev;
}
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gc_sweep_symbols(pic);
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while (page) {
gc_sweep_page(pic, page);
page = page->next;
}
}
void
pic_gc_run(pic_state *pic)
{
#if GC_DEBUG
struct heap_page *page;
#endif
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if (! pic->gc_enable) {
return;
}
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#if DEBUG
puts("gc run!");
#endif
gc_mark_phase(pic);
gc_sweep_phase(pic);
#if GC_DEBUG
for (page = pic->heap->pages; page; page = page->next) {
union header *bp, *p;
unsigned char *c;
for (bp = page->basep; ; bp = bp->s.ptr) {
for (c = (unsigned char *)(bp+1); c != (unsigned char *)(bp + bp->s.size); ++c) {
assert(*c == 0xAA);
}
for (p = bp + bp->s.size; p != bp->s.ptr; p += p->s.size) {
if (p == page->endp) {
/* if (page->next) */
/* assert(bp->s.ptr == page->next->basep); */
/* else */
/* assert(bp->s.ptr == &pic->heap->base); */
goto escape;
}
assert(! gc_is_marked(p));
}
}
escape:
((void)0);
}
puts("not error on heap found! gc successfully finished");
#endif
}
struct pic_object *
pic_obj_alloc_unsafe(pic_state *pic, size_t size, enum pic_tt tt)
{
struct pic_object *obj;
#if GC_DEBUG
printf("*allocating: %s\n", pic_type_repr(tt));
#endif
#if GC_STRESS
pic_gc_run(pic);
#endif
obj = (struct pic_object *)gc_alloc(pic, size);
if (obj == NULL) {
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pic_gc_run(pic);
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obj = (struct pic_object *)gc_alloc(pic, size);
if (obj == NULL) {
add_heap_page(pic);
obj = (struct pic_object *)gc_alloc(pic, size);
if (obj == NULL)
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pic_panic(pic, "GC memory exhausted");
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}
}
obj->tt = tt;
return obj;
}
struct pic_object *
pic_obj_alloc(pic_state *pic, size_t size, enum pic_tt tt)
{
struct pic_object *obj;
obj = pic_obj_alloc_unsafe(pic, size, tt);
gc_protect(pic, obj);
return obj;
}