/*** $Id: lstate.c,v 2.127 2014/11/02 19:33:33 roberto Exp $** Global State** See Copyright Notice in lua.h*/ #define lstate_c#define LUA_CORE #include "lprefix.h" #include <stddef.h>#include <string.h> #include "lua.h" #include "lapi.h"#include "ldebug.h"#include "ldo.h"#include "lfunc.h"#include "lgc.h"#include "llex.h"#include "lmem.h"#include "lstate.h"#include "lstring.h"#include "ltable.h"#include "ltm.h" #if !defined(LUAI_GCPAUSE)#define LUAI_GCPAUSE 200 /* 200% */#endif #if !defined(LUAI_GCMUL)#define LUAI_GCMUL 200 /* GC runs 'twice the speed' of memory allocation */#endif #define MEMERRMSG "not enough memory" /*** a macro to help the creation of a unique random seed when a state is** created; the seed is used to randomize hashes.*/#if !defined(luai_makeseed)#include <time.h>#define luai_makeseed() cast(unsigned int, time(NULL))#endif /*** thread state + extra space*/typedef struct LX { lu_byte extra_[LUA_EXTRASPACE]; lua_State l;} LX; /*** Main thread combines a thread state and the global state*/typedef struct LG { LX l; global_State g;} LG; #define fromstate(L) (cast(LX *, cast(lu_byte *, (L)) - offsetof(LX, l))) /*** Compute an initial seed as random as possible. Rely on Address Space** Layout Randomization (if present) to increase randomness..*/#define addbuff(b,p,e) \ { size_t t = cast(size_t, e); \ memcpy(buff + p, &t, sizeof(t)); p += sizeof(t); } static unsigned int makeseed (lua_State *L) { char buff[4 * sizeof(size_t)]; unsigned int h = luai_makeseed(); int p = 0; addbuff(buff, p, L); /* heap variable */ addbuff(buff, p, &h); /* local variable */ addbuff(buff, p, luaO_nilobject); /* global variable */ addbuff(buff, p, &lua_newstate); /* public function */ lua_assert(p == sizeof(buff)); return luaS_hash(buff, p, h);} /*** set GCdebt to a new value keeping the value (totalbytes + GCdebt)** invariant*/void luaE_setdebt (global_State *g, l_mem debt) { g->totalbytes -= (debt - g->GCdebt); g->GCdebt = debt;} CallInfo *luaE_extendCI (lua_State *L) { CallInfo *ci = luaM_new(L, CallInfo); lua_assert(L->ci->next == NULL); L->ci->next = ci; ci->previous = L->ci; ci->next = NULL; return ci;} /*** free all CallInfo structures not in use by a thread*/void luaE_freeCI (lua_State *L) { CallInfo *ci = L->ci; CallInfo *next = ci->next; ci->next = NULL; while ((ci = next) != NULL) { next = ci->next; luaM_free(L, ci); }} /*** free half of the CallInfo structures not in use by a thread*/void luaE_shrinkCI (lua_State *L) { CallInfo *ci = L->ci; while (ci->next != NULL) { /* while there is 'next' */ CallInfo *next2 = ci->next->next; /* next's next */ if (next2 == NULL) break; luaM_free(L, ci->next); /* remove next */ ci->next = next2; /* remove 'next' from the list */ next2->previous = ci; ci = next2; }} static void stack_init (lua_State *L1, lua_State *L) { int i; CallInfo *ci; /* initialize stack array */ L1->stack = luaM_newvector(L, BASIC_STACK_SIZE, TValue); L1->stacksize = BASIC_STACK_SIZE; for (i = 0; i < BASIC_STACK_SIZE; i++) setnilvalue(L1->stack + i); /* erase new stack */ L1->top = L1->stack; L1->stack_last = L1->stack + L1->stacksize - EXTRA_STACK; /* initialize first ci */ ci = &L1->base_ci; ci->next = ci->previous = NULL; ci->callstatus = 0; ci->func = L1->top; setnilvalue(L1->top++); /* 'function' entry for this 'ci' */ ci->top = L1->top + LUA_MINSTACK; L1->ci = ci;} static void freestack (lua_State *L) { if (L->stack == NULL) return; /* stack not completely built yet */ L->ci = &L->base_ci; /* free the entire 'ci' list */ luaE_freeCI(L); luaM_freearray(L, L->stack, L->stacksize); /* free stack array */} /*** Create registry table and its predefined values*/static void init_registry (lua_State *L, global_State *g) { TValue temp; /* create registry */ Table *registry = luaH_new(L); sethvalue(L, &g->l_registry, registry); luaH_resize(L, registry, LUA_RIDX_LAST, 0); /* registry[LUA_RIDX_MAINTHREAD] = L */ setthvalue(L, &temp, L); /* temp = L */ luaH_setint(L, registry, LUA_RIDX_MAINTHREAD, &temp); /* registry[LUA_RIDX_GLOBALS] = table of globals */ sethvalue(L, &temp, luaH_new(L)); /* temp = new table (global table) */ luaH_setint(L, registry, LUA_RIDX_GLOBALS, &temp);} /*** open parts of the state that may cause memory-allocation errors.** ('g->version' != NULL flags that the state was completely build)*/static void f_luaopen (lua_State *L, void *ud) { global_State *g = G(L); UNUSED(ud); stack_init(L, L); /* init stack */ init_registry(L, g); luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */ luaT_init(L); luaX_init(L); /* pre-create memory-error message */ g->memerrmsg = luaS_newliteral(L, MEMERRMSG); luaC_fix(L, obj2gco(g->memerrmsg)); /* it should never be collected */ g->gcrunning = 1; /* allow gc */ g->version = lua_version(NULL); luai_userstateopen(L);} /*** preinitialize a thread with consistent values without allocating** any memory (to avoid errors)*/static void preinit_thread (lua_State *L, global_State *g) { G(L) = g; L->stack = NULL; L->ci = NULL; L->stacksize = 0; L->twups = L; /* thread has no upvalues */ L->errorJmp = NULL; L->nCcalls = 0; L->hook = NULL; L->hookmask = 0; L->basehookcount = 0; L->allowhook = 1; resethookcount(L); L->openupval = NULL; L->nny = 1; L->status = LUA_OK; L->errfunc = 0;} static void close_state (lua_State *L) { global_State *g = G(L); luaF_close(L, L->stack); /* close all upvalues for this thread */ luaC_freeallobjects(L); /* collect all objects */ if (g->version) /* closing a fully built state? */ luai_userstateclose(L); luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size); luaZ_freebuffer(L, &g->buff); freestack(L); lua_assert(gettotalbytes(g) == sizeof(LG)); (*g->frealloc)(g->ud, fromstate(L), sizeof(LG), 0); /* free main block */} LUA_API lua_State *lua_newthread (lua_State *L) { global_State *g = G(L); lua_State *L1; lua_lock(L); luaC_checkGC(L); /* create new thread */ L1 = &cast(LX *, luaM_newobject(L, LUA_TTHREAD, sizeof(LX)))->l; L1->marked = luaC_white(g); L1->tt = LUA_TTHREAD; /* link it on list 'allgc' */ L1->next = g->allgc; g->allgc = obj2gco(L1); /* anchor it on L stack */ setthvalue(L, L->top, L1); api_incr_top(L); preinit_thread(L1, g); L1->hookmask = L->hookmask; L1->basehookcount = L->basehookcount; L1->hook = L->hook; resethookcount(L1); /* initialize L1 extra space */ memcpy(lua_getextraspace(L1), lua_getextraspace(g->mainthread), LUA_EXTRASPACE); luai_userstatethread(L, L1); stack_init(L1, L); /* init stack */ lua_unlock(L); return L1;} void luaE_freethread (lua_State *L, lua_State *L1) { LX *l = fromstate(L1); luaF_close(L1, L1->stack); /* close all upvalues for this thread */ lua_assert(L1->openupval == NULL); luai_userstatefree(L, L1); freestack(L1); luaM_free(L, l);} LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) { int i; lua_State *L; global_State *g; LG *l = cast(LG *, (*f)(ud, NULL, LUA_TTHREAD, sizeof(LG))); if (l == NULL) return NULL; L = &l->l.l; g = &l->g; L->next = NULL; L->tt = LUA_TTHREAD; g->currentwhite = bitmask(WHITE0BIT); L->marked = luaC_white(g); preinit_thread(L, g); g->frealloc = f; g->ud = ud; g->mainthread = L; g->seed = makeseed(L); g->gcrunning = 0; /* no GC while building state */ g->GCestimate = 0; g->strt.size = g->strt.nuse = 0; g->strt.hash = NULL; setnilvalue(&g->l_registry); luaZ_initbuffer(L, &g->buff); g->panic = NULL; g->version = NULL; g->gcstate = GCSpause; g->gckind = KGC_NORMAL; g->allgc = g->finobj = g->tobefnz = g->fixedgc = NULL; g->sweepgc = NULL; g->gray = g->grayagain = NULL; g->weak = g->ephemeron = g->allweak = NULL; g->twups = NULL; g->totalbytes = sizeof(LG); g->GCdebt = 0; g->gcfinnum = 0; g->gcpause = LUAI_GCPAUSE; g->gcstepmul = LUAI_GCMUL; for (i=0; i < LUA_NUMTAGS; i++) g->mt[i] = NULL; if (luaD_rawrunprotected(L, f_luaopen, NULL) != LUA_OK) { /* memory allocation error: free partial state */ close_state(L); L = NULL; } return L;} LUA_API void lua_close (lua_State *L) { L = G(L)->mainthread; /* only the main thread can be closed */ lua_lock(L); close_state(L);}
/*
** $Id: lstate.c,v 2.127 2014/11/02 19:33:33 roberto Exp $
** Global State
** See Copyright Notice in lua.h
*/
#define lstate_c
#define LUA_CORE
#include "lprefix.h"
#include <stddef.h>
#include <string.h>
#include "lua.h"
#include "lapi.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
#include "llex.h"
#include "lmem.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#if !defined(LUAI_GCPAUSE)
#define LUAI_GCPAUSE 200 /* 200% */
#endif
#if !defined(LUAI_GCMUL)
#define LUAI_GCMUL 200 /* GC runs 'twice the speed' of memory allocation */
#endif
#define MEMERRMSG "not enough memory"
/*
** a macro to help the creation of a unique random seed when a state is
** created; the seed is used to randomize hashes.
*/
#if !defined(luai_makeseed)
#include <time.h>
#define luai_makeseed() cast(unsigned int, time(NULL))
#endif
/*
** thread state + extra space
*/
typedef struct LX {
lu_byte extra_[LUA_EXTRASPACE];
lua_State l;
} LX;
/*
** Main thread combines a thread state and the global state
*/
typedef struct LG {
LX l;
global_State g;
} LG;
#define fromstate(L) (cast(LX *, cast(lu_byte *, (L)) - offsetof(LX, l)))
/*
** Compute an initial seed as random as possible. Rely on Address Space
** Layout Randomization (if present) to increase randomness..
*/
#define addbuff(b,p,e) \
{ size_t t = cast(size_t, e); \
memcpy(buff + p, &t, sizeof(t)); p += sizeof(t); }
static unsigned int makeseed (lua_State *L) {
char buff[4 * sizeof(size_t)];
unsigned int h = luai_makeseed();
int p = 0;
addbuff(buff, p, L); /* heap variable */
addbuff(buff, p, &h); /* local variable */
addbuff(buff, p, luaO_nilobject); /* global variable */
addbuff(buff, p, &lua_newstate); /* public function */
lua_assert(p == sizeof(buff));
return luaS_hash(buff, p, h);
}
/*
** set GCdebt to a new value keeping the value (totalbytes + GCdebt)
** invariant
*/
void luaE_setdebt (global_State *g, l_mem debt) {
g->totalbytes -= (debt - g->GCdebt);
g->GCdebt = debt;
}
CallInfo *luaE_extendCI (lua_State *L) {
CallInfo *ci = luaM_new(L, CallInfo);
lua_assert(L->ci->next == NULL);
L->ci->next = ci;
ci->previous = L->ci;
ci->next = NULL;
return ci;
}
/*
** free all CallInfo structures not in use by a thread
*/
void luaE_freeCI (lua_State *L) {
CallInfo *ci = L->ci;
CallInfo *next = ci->next;
ci->next = NULL;
while ((ci = next) != NULL) {
next = ci->next;
luaM_free(L, ci);
}
}
/*
** free half of the CallInfo structures not in use by a thread
*/
void luaE_shrinkCI (lua_State *L) {
CallInfo *ci = L->ci;
while (ci->next != NULL) { /* while there is 'next' */
CallInfo *next2 = ci->next->next; /* next's next */
if (next2 == NULL) break;
luaM_free(L, ci->next); /* remove next */
ci->next = next2; /* remove 'next' from the list */
next2->previous = ci;
ci = next2;
}
}
static void stack_init (lua_State *L1, lua_State *L) {
int i; CallInfo *ci;
/* initialize stack array */
L1->stack = luaM_newvector(L, BASIC_STACK_SIZE, TValue);
L1->stacksize = BASIC_STACK_SIZE;
for (i = 0; i < BASIC_STACK_SIZE; i++)
setnilvalue(L1->stack + i); /* erase new stack */
L1->top = L1->stack;
L1->stack_last = L1->stack + L1->stacksize - EXTRA_STACK;
/* initialize first ci */
ci = &L1->base_ci;
ci->next = ci->previous = NULL;
ci->callstatus = 0;
ci->func = L1->top;
setnilvalue(L1->top++); /* 'function' entry for this 'ci' */
ci->top = L1->top + LUA_MINSTACK;
L1->ci = ci;
}
static void freestack (lua_State *L) {
if (L->stack == NULL)
return; /* stack not completely built yet */
L->ci = &L->base_ci; /* free the entire 'ci' list */
luaE_freeCI(L);
luaM_freearray(L, L->stack, L->stacksize); /* free stack array */
}
/*
** Create registry table and its predefined values
*/
static void init_registry (lua_State *L, global_State *g) {
TValue temp;
/* create registry */
Table *registry = luaH_new(L);
sethvalue(L, &g->l_registry, registry);
luaH_resize(L, registry, LUA_RIDX_LAST, 0);
/* registry[LUA_RIDX_MAINTHREAD] = L */
setthvalue(L, &temp, L); /* temp = L */
luaH_setint(L, registry, LUA_RIDX_MAINTHREAD, &temp);
/* registry[LUA_RIDX_GLOBALS] = table of globals */
sethvalue(L, &temp, luaH_new(L)); /* temp = new table (global table) */
luaH_setint(L, registry, LUA_RIDX_GLOBALS, &temp);
}
/*
** open parts of the state that may cause memory-allocation errors.
** ('g->version' != NULL flags that the state was completely build)
*/
static void f_luaopen (lua_State *L, void *ud) {
global_State *g = G(L);
UNUSED(ud);
stack_init(L, L); /* init stack */
init_registry(L, g);
luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */
luaT_init(L);
luaX_init(L);
/* pre-create memory-error message */
g->memerrmsg = luaS_newliteral(L, MEMERRMSG);
luaC_fix(L, obj2gco(g->memerrmsg)); /* it should never be collected */
g->gcrunning = 1; /* allow gc */
g->version = lua_version(NULL);
luai_userstateopen(L);
}
/*
** preinitialize a thread with consistent values without allocating
** any memory (to avoid errors)
*/
static void preinit_thread (lua_State *L, global_State *g) {
G(L) = g;
L->stack = NULL;
L->ci = NULL;
L->stacksize = 0;
L->twups = L; /* thread has no upvalues */
L->errorJmp = NULL;
L->nCcalls = 0;
L->hook = NULL;
L->hookmask = 0;
L->basehookcount = 0;
L->allowhook = 1;
resethookcount(L);
L->openupval = NULL;
L->nny = 1;
L->status = LUA_OK;
L->errfunc = 0;
}
static void close_state (lua_State *L) {
global_State *g = G(L);
luaF_close(L, L->stack); /* close all upvalues for this thread */
luaC_freeallobjects(L); /* collect all objects */
if (g->version) /* closing a fully built state? */
luai_userstateclose(L);
luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size);
luaZ_freebuffer(L, &g->buff);
freestack(L);
lua_assert(gettotalbytes(g) == sizeof(LG));
(*g->frealloc)(g->ud, fromstate(L), sizeof(LG), 0); /* free main block */
}
LUA_API lua_State *lua_newthread (lua_State *L) {
global_State *g = G(L);
lua_State *L1;
lua_lock(L);
luaC_checkGC(L);
/* create new thread */
L1 = &cast(LX *, luaM_newobject(L, LUA_TTHREAD, sizeof(LX)))->l;
L1->marked = luaC_white(g);
L1->tt = LUA_TTHREAD;
/* link it on list 'allgc' */
L1->next = g->allgc;
g->allgc = obj2gco(L1);
/* anchor it on L stack */
setthvalue(L, L->top, L1);
api_incr_top(L);
preinit_thread(L1, g);
L1->hookmask = L->hookmask;
L1->basehookcount = L->basehookcount;
L1->hook = L->hook;
resethookcount(L1);
/* initialize L1 extra space */
memcpy(lua_getextraspace(L1), lua_getextraspace(g->mainthread),
LUA_EXTRASPACE);
luai_userstatethread(L, L1);
stack_init(L1, L); /* init stack */
lua_unlock(L);
return L1;
}
void luaE_freethread (lua_State *L, lua_State *L1) {
LX *l = fromstate(L1);
luaF_close(L1, L1->stack); /* close all upvalues for this thread */
lua_assert(L1->openupval == NULL);
luai_userstatefree(L, L1);
freestack(L1);
luaM_free(L, l);
}
LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
int i;
lua_State *L;
global_State *g;
LG *l = cast(LG *, (*f)(ud, NULL, LUA_TTHREAD, sizeof(LG)));
if (l == NULL) return NULL;
L = &l->l.l;
g = &l->g;
L->next = NULL;
L->tt = LUA_TTHREAD;
g->currentwhite = bitmask(WHITE0BIT);
L->marked = luaC_white(g);
preinit_thread(L, g);
g->frealloc = f;
g->ud = ud;
g->mainthread = L;
g->seed = makeseed(L);
g->gcrunning = 0; /* no GC while building state */
g->GCestimate = 0;
g->strt.size = g->strt.nuse = 0;
g->strt.hash = NULL;
setnilvalue(&g->l_registry);
luaZ_initbuffer(L, &g->buff);
g->panic = NULL;
g->version = NULL;
g->gcstate = GCSpause;
g->gckind = KGC_NORMAL;
g->allgc = g->finobj = g->tobefnz = g->fixedgc = NULL;
g->sweepgc = NULL;
g->gray = g->grayagain = NULL;
g->weak = g->ephemeron = g->allweak = NULL;
g->twups = NULL;
g->totalbytes = sizeof(LG);
g->GCdebt = 0;
g->gcfinnum = 0;
g->gcpause = LUAI_GCPAUSE;
g->gcstepmul = LUAI_GCMUL;
for (i=0; i < LUA_NUMTAGS; i++) g->mt[i] = NULL;
if (luaD_rawrunprotected(L, f_luaopen, NULL) != LUA_OK) {
/* memory allocation error: free partial state */
close_state(L);
L = NULL;
}
return L;
}
LUA_API void lua_close (lua_State *L) {
L = G(L)->mainthread; /* only the main thread can be closed */
lua_lock(L);
close_state(L);
}