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Merge pull request #248 from picrin-scheme/symbol-gc3 

symbol gc
This commit is contained in:
Yuichi Nishiwaki 2015-01-20 20:07:28 +09:00
parent 0c88249aa6 06c998e0b2
commit e67996f8af
1 changed files with 42 additions and 6 deletions
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48
extlib/benz/gc.c
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@ -530,6 +530,20 @@ gc_mark_trie(pic_state *pic, struct pic_trie *trie)
static void
gc_mark_global_symbols(pic_state *pic)
{
M(sDEFINE); M(sLAMBDA); M(sIF); M(sBEGIN); M(sQUOTE); M(sSETBANG);
M(sQUASIQUOTE); M(sUNQUOTE); M(sUNQUOTE_SPLICING);
M(sDEFINE_SYNTAX); M(sIMPORT); M(sEXPORT);
M(sDEFINE_LIBRARY); M(sIN_LIBRARY);
M(sCOND_EXPAND); M(sAND); M(sOR); M(sELSE); M(sLIBRARY);
M(sONLY); M(sRENAME); M(sPREFIX); M(sEXCEPT);
M(sCONS); M(sCAR); M(sCDR); M(sNILP);
M(sSYMBOLP); M(sPAIRP);
M(sADD); M(sSUB); M(sMUL); M(sDIV); M(sMINUS);
M(sEQ); M(sLT); M(sLE); M(sGT); M(sGE); M(sNOT);
M(sREAD); M(sFILE);
M(sCALL); M(sTAILCALL); M(sCALL_WITH_VALUES); M(sTAILCALL_WITH_VALUES);
M(sGREF); M(sLREF); M(sCREF); M(sRETURN);
M(rDEFINE); M(rLAMBDA); M(rIF); M(rBEGIN); M(rQUOTE); M(rSETBANG);
M(rDEFINE_SYNTAX); M(rIMPORT); M(rEXPORT);
M(rDEFINE_LIBRARY); M(rIN_LIBRARY);
@ -573,14 +587,9 @@ gc_mark_phase(pic_state *pic)
gc_mark_object(pic, pic->arena[j]);
}
/* mark reserved uninterned symbols */
/* mark reserved symbols */
gc_mark_global_symbols(pic);
/* mark all interned symbols */
for (it = xh_begin(&pic->syms); it != NULL; it = xh_next(it)) {
gc_mark_object(pic, (struct pic_object *)xh_val(it, pic_sym *));
}
/* global variables */
if (pic->globals) {
gc_mark_object(pic, (struct pic_object *)pic->globals);
@ -709,6 +718,31 @@ gc_finalize_object(pic_state *pic, struct pic_object *obj)
}
}
static void
gc_sweep_symbols(pic_state *pic)
{
xh_entry *it;
xvect xv;
size_t i;
char *cstr;
xv_init(&xv, sizeof(xh_entry *));
for (it = xh_begin(&pic->syms); it != NULL; it = xh_next(it)) {
if (! gc_obj_is_marked((struct pic_object *)xh_val(it, pic_sym *))) {
xv_push(&xv, &it);
}
}
for (i = 0; i < xv_size(&xv); ++i) {
cstr = xh_key(*(xh_entry **)xv_get(&xv, i), char *);
xh_del_str(&pic->syms, cstr);
pic_free(pic, cstr);
}
}
static void
gc_sweep_page(pic_state *pic, struct heap_page *page)
{
@ -775,6 +809,8 @@ gc_sweep_phase(pic_state *pic)
}
} while (it != NULL);
gc_sweep_symbols(pic);
while (page) {
gc_sweep_page(pic, page);
page = page->next;