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Diffstat (limited to 'deps/LuaJIT/src/lj_state.c')
-rw-r--r-- | deps/LuaJIT/src/lj_state.c | 300 |
1 files changed, 0 insertions, 300 deletions
diff --git a/deps/LuaJIT/src/lj_state.c b/deps/LuaJIT/src/lj_state.c deleted file mode 100644 index 632dd07..0000000 --- a/deps/LuaJIT/src/lj_state.c +++ /dev/null @@ -1,300 +0,0 @@ -/* -** State and stack handling. -** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h -** -** Portions taken verbatim or adapted from the Lua interpreter. -** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h -*/ - -#define lj_state_c -#define LUA_CORE - -#include "lj_obj.h" -#include "lj_gc.h" -#include "lj_err.h" -#include "lj_buf.h" -#include "lj_str.h" -#include "lj_tab.h" -#include "lj_func.h" -#include "lj_meta.h" -#include "lj_state.h" -#include "lj_frame.h" -#if LJ_HASFFI -#include "lj_ctype.h" -#endif -#include "lj_trace.h" -#include "lj_dispatch.h" -#include "lj_vm.h" -#include "lj_lex.h" -#include "lj_alloc.h" -#include "luajit.h" - -/* -- Stack handling ------------------------------------------------------ */ - -/* Stack sizes. */ -#define LJ_STACK_MIN LUA_MINSTACK /* Min. stack size. */ -#define LJ_STACK_MAX LUAI_MAXSTACK /* Max. stack size. */ -#define LJ_STACK_START (2*LJ_STACK_MIN) /* Starting stack size. */ -#define LJ_STACK_MAXEX (LJ_STACK_MAX + 1 + LJ_STACK_EXTRA) - -/* Explanation of LJ_STACK_EXTRA: -** -** Calls to metamethods store their arguments beyond the current top -** without checking for the stack limit. This avoids stack resizes which -** would invalidate passed TValue pointers. The stack check is performed -** later by the function header. This can safely resize the stack or raise -** an error. Thus we need some extra slots beyond the current stack limit. -** -** Most metamethods need 4 slots above top (cont, mobj, arg1, arg2) plus -** one extra slot if mobj is not a function. Only lj_meta_tset needs 5 -** slots above top, but then mobj is always a function. So we can get by -** with 5 extra slots. -** LJ_FR2: We need 2 more slots for the frame PC and the continuation PC. -*/ - -/* Resize stack slots and adjust pointers in state. */ -static void resizestack(lua_State *L, MSize n) -{ - TValue *st, *oldst = tvref(L->stack); - ptrdiff_t delta; - MSize oldsize = L->stacksize; - MSize realsize = n + 1 + LJ_STACK_EXTRA; - GCobj *up; - lua_assert((MSize)(tvref(L->maxstack)-oldst)==L->stacksize-LJ_STACK_EXTRA-1); - st = (TValue *)lj_mem_realloc(L, tvref(L->stack), - (MSize)(oldsize*sizeof(TValue)), - (MSize)(realsize*sizeof(TValue))); - setmref(L->stack, st); - delta = (char *)st - (char *)oldst; - setmref(L->maxstack, st + n); - while (oldsize < realsize) /* Clear new slots. */ - setnilV(st + oldsize++); - L->stacksize = realsize; - if ((size_t)(mref(G(L)->jit_base, char) - (char *)oldst) < oldsize) - setmref(G(L)->jit_base, mref(G(L)->jit_base, char) + delta); - L->base = (TValue *)((char *)L->base + delta); - L->top = (TValue *)((char *)L->top + delta); - for (up = gcref(L->openupval); up != NULL; up = gcnext(up)) - setmref(gco2uv(up)->v, (TValue *)((char *)uvval(gco2uv(up)) + delta)); -} - -/* Relimit stack after error, in case the limit was overdrawn. */ -void lj_state_relimitstack(lua_State *L) -{ - if (L->stacksize > LJ_STACK_MAXEX && L->top-tvref(L->stack) < LJ_STACK_MAX-1) - resizestack(L, LJ_STACK_MAX); -} - -/* Try to shrink the stack (called from GC). */ -void lj_state_shrinkstack(lua_State *L, MSize used) -{ - if (L->stacksize > LJ_STACK_MAXEX) - return; /* Avoid stack shrinking while handling stack overflow. */ - if (4*used < L->stacksize && - 2*(LJ_STACK_START+LJ_STACK_EXTRA) < L->stacksize && - /* Don't shrink stack of live trace. */ - (tvref(G(L)->jit_base) == NULL || obj2gco(L) != gcref(G(L)->cur_L))) - resizestack(L, L->stacksize >> 1); -} - -/* Try to grow stack. */ -void LJ_FASTCALL lj_state_growstack(lua_State *L, MSize need) -{ - MSize n; - if (L->stacksize > LJ_STACK_MAXEX) /* Overflow while handling overflow? */ - lj_err_throw(L, LUA_ERRERR); - n = L->stacksize + need; - if (n > LJ_STACK_MAX) { - n += 2*LUA_MINSTACK; - } else if (n < 2*L->stacksize) { - n = 2*L->stacksize; - if (n >= LJ_STACK_MAX) - n = LJ_STACK_MAX; - } - resizestack(L, n); - if (L->stacksize > LJ_STACK_MAXEX) - lj_err_msg(L, LJ_ERR_STKOV); -} - -void LJ_FASTCALL lj_state_growstack1(lua_State *L) -{ - lj_state_growstack(L, 1); -} - -/* Allocate basic stack for new state. */ -static void stack_init(lua_State *L1, lua_State *L) -{ - TValue *stend, *st = lj_mem_newvec(L, LJ_STACK_START+LJ_STACK_EXTRA, TValue); - setmref(L1->stack, st); - L1->stacksize = LJ_STACK_START + LJ_STACK_EXTRA; - stend = st + L1->stacksize; - setmref(L1->maxstack, stend - LJ_STACK_EXTRA - 1); - setthreadV(L1, st++, L1); /* Needed for curr_funcisL() on empty stack. */ - if (LJ_FR2) setnilV(st++); - L1->base = L1->top = st; - while (st < stend) /* Clear new slots. */ - setnilV(st++); -} - -/* -- State handling ------------------------------------------------------ */ - -/* Open parts that may cause memory-allocation errors. */ -static TValue *cpluaopen(lua_State *L, lua_CFunction dummy, void *ud) -{ - global_State *g = G(L); - UNUSED(dummy); - UNUSED(ud); - stack_init(L, L); - /* NOBARRIER: State initialization, all objects are white. */ - setgcref(L->env, obj2gco(lj_tab_new(L, 0, LJ_MIN_GLOBAL))); - settabV(L, registry(L), lj_tab_new(L, 0, LJ_MIN_REGISTRY)); - lj_str_resize(L, LJ_MIN_STRTAB-1); - lj_meta_init(L); - lj_lex_init(L); - fixstring(lj_err_str(L, LJ_ERR_ERRMEM)); /* Preallocate memory error msg. */ - g->gc.threshold = 4*g->gc.total; - lj_trace_initstate(g); - return NULL; -} - -static void close_state(lua_State *L) -{ - global_State *g = G(L); - lj_func_closeuv(L, tvref(L->stack)); - lj_gc_freeall(g); - lua_assert(gcref(g->gc.root) == obj2gco(L)); - lua_assert(g->strnum == 0); - lj_trace_freestate(g); -#if LJ_HASFFI - lj_ctype_freestate(g); -#endif - lj_mem_freevec(g, g->strhash, g->strmask+1, GCRef); - lj_buf_free(g, &g->tmpbuf); - lj_mem_freevec(g, tvref(L->stack), L->stacksize, TValue); - lua_assert(g->gc.total == sizeof(GG_State)); -#ifndef LUAJIT_USE_SYSMALLOC - if (g->allocf == lj_alloc_f) - lj_alloc_destroy(g->allocd); - else -#endif - g->allocf(g->allocd, G2GG(g), sizeof(GG_State), 0); -} - -#if LJ_64 && !LJ_GC64 && !(defined(LUAJIT_USE_VALGRIND) && defined(LUAJIT_USE_SYSMALLOC)) -lua_State *lj_state_newstate(lua_Alloc f, void *ud) -#else -LUA_API lua_State *lua_newstate(lua_Alloc f, void *ud) -#endif -{ - GG_State *GG = (GG_State *)f(ud, NULL, 0, sizeof(GG_State)); - lua_State *L = &GG->L; - global_State *g = &GG->g; - if (GG == NULL || !checkptrGC(GG)) return NULL; - memset(GG, 0, sizeof(GG_State)); - L->gct = ~LJ_TTHREAD; - L->marked = LJ_GC_WHITE0 | LJ_GC_FIXED | LJ_GC_SFIXED; /* Prevent free. */ - L->dummy_ffid = FF_C; - setmref(L->glref, g); - g->gc.currentwhite = LJ_GC_WHITE0 | LJ_GC_FIXED; - g->strempty.marked = LJ_GC_WHITE0; - g->strempty.gct = ~LJ_TSTR; - g->allocf = f; - g->allocd = ud; - setgcref(g->mainthref, obj2gco(L)); - setgcref(g->uvhead.prev, obj2gco(&g->uvhead)); - setgcref(g->uvhead.next, obj2gco(&g->uvhead)); - g->strmask = ~(MSize)0; - setnilV(registry(L)); - setnilV(&g->nilnode.val); - setnilV(&g->nilnode.key); -#if !LJ_GC64 - setmref(g->nilnode.freetop, &g->nilnode); -#endif - lj_buf_init(NULL, &g->tmpbuf); - g->gc.state = GCSpause; - setgcref(g->gc.root, obj2gco(L)); - setmref(g->gc.sweep, &g->gc.root); - g->gc.total = sizeof(GG_State); - g->gc.pause = LUAI_GCPAUSE; - g->gc.stepmul = LUAI_GCMUL; - lj_dispatch_init((GG_State *)L); - L->status = LUA_ERRERR+1; /* Avoid touching the stack upon memory error. */ - if (lj_vm_cpcall(L, NULL, NULL, cpluaopen) != 0) { - /* Memory allocation error: free partial state. */ - close_state(L); - return NULL; - } - L->status = LUA_OK; - return L; -} - -static TValue *cpfinalize(lua_State *L, lua_CFunction dummy, void *ud) -{ - UNUSED(dummy); - UNUSED(ud); - lj_gc_finalize_cdata(L); - lj_gc_finalize_udata(L); - /* Frame pop omitted. */ - return NULL; -} - -LUA_API void lua_close(lua_State *L) -{ - global_State *g = G(L); - int i; - L = mainthread(g); /* Only the main thread can be closed. */ -#if LJ_HASPROFILE - luaJIT_profile_stop(L); -#endif - setgcrefnull(g->cur_L); - lj_func_closeuv(L, tvref(L->stack)); - lj_gc_separateudata(g, 1); /* Separate udata which have GC metamethods. */ -#if LJ_HASJIT - G2J(g)->flags &= ~JIT_F_ON; - G2J(g)->state = LJ_TRACE_IDLE; - lj_dispatch_update(g); -#endif - for (i = 0;;) { - hook_enter(g); - L->status = LUA_OK; - L->base = L->top = tvref(L->stack) + 1 + LJ_FR2; - L->cframe = NULL; - if (lj_vm_cpcall(L, NULL, NULL, cpfinalize) == LUA_OK) { - if (++i >= 10) break; - lj_gc_separateudata(g, 1); /* Separate udata again. */ - if (gcref(g->gc.mmudata) == NULL) /* Until nothing is left to do. */ - break; - } - } - close_state(L); -} - -lua_State *lj_state_new(lua_State *L) -{ - lua_State *L1 = lj_mem_newobj(L, lua_State); - L1->gct = ~LJ_TTHREAD; - L1->dummy_ffid = FF_C; - L1->status = LUA_OK; - L1->stacksize = 0; - setmref(L1->stack, NULL); - L1->cframe = NULL; - /* NOBARRIER: The lua_State is new (marked white). */ - setgcrefnull(L1->openupval); - setmrefr(L1->glref, L->glref); - setgcrefr(L1->env, L->env); - stack_init(L1, L); /* init stack */ - lua_assert(iswhite(obj2gco(L1))); - return L1; -} - -void LJ_FASTCALL lj_state_free(global_State *g, lua_State *L) -{ - lua_assert(L != mainthread(g)); - if (obj2gco(L) == gcref(g->cur_L)) - setgcrefnull(g->cur_L); - lj_func_closeuv(L, tvref(L->stack)); - lua_assert(gcref(L->openupval) == NULL); - lj_mem_freevec(g, tvref(L->stack), L->stacksize, TValue); - lj_mem_freet(g, L); -} - |