1345 lines
31 KiB
C
1345 lines
31 KiB
C
/* BEGIN CSTYLED */
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/*
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** $Id: lapi.c,v 2.171.1.1 2013/04/12 18:48:47 roberto Exp $
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** Lua API
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** See Copyright Notice in lua.h
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*/
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#define lapi_c
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#define LUA_CORE
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#include <sys/lua/lua.h>
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#include "lapi.h"
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#include "ldebug.h"
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#include "ldo.h"
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#include "lfunc.h"
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#include "lgc.h"
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#include "lmem.h"
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#include "lobject.h"
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#include "lstate.h"
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#include "lstring.h"
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#include "ltable.h"
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#include "ltm.h"
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#include "lvm.h"
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const char lua_ident[] =
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"$LuaVersion: " LUA_COPYRIGHT " $"
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"$LuaAuthors: " LUA_AUTHORS " $";
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/* value at a non-valid index */
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#define NONVALIDVALUE cast(TValue *, luaO_nilobject)
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/* corresponding test */
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#define isvalid(o) ((o) != luaO_nilobject)
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/* test for pseudo index */
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#define ispseudo(i) ((i) <= LUA_REGISTRYINDEX)
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/* test for valid but not pseudo index */
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#define isstackindex(i, o) (isvalid(o) && !ispseudo(i))
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#define api_checkvalidindex(L, o) api_check(L, isvalid(o), "invalid index")
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#define api_checkstackindex(L, i, o) \
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api_check(L, isstackindex(i, o), "index not in the stack")
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static TValue *index2addr (lua_State *L, int idx) {
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CallInfo *ci = L->ci;
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if (idx > 0) {
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TValue *o = ci->func + idx;
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api_check(L, idx <= ci->top - (ci->func + 1), "unacceptable index");
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if (o >= L->top) return NONVALIDVALUE;
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else return o;
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}
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else if (!ispseudo(idx)) { /* negative index */
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api_check(L, idx != 0 && -idx <= L->top - (ci->func + 1), "invalid index");
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return L->top + idx;
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}
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else if (idx == LUA_REGISTRYINDEX)
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return &G(L)->l_registry;
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else { /* upvalues */
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idx = LUA_REGISTRYINDEX - idx;
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api_check(L, idx <= MAXUPVAL + 1, "upvalue index too large");
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if (ttislcf(ci->func)) /* light C function? */
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return NONVALIDVALUE; /* it has no upvalues */
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else {
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CClosure *func = clCvalue(ci->func);
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return (idx <= func->nupvalues) ? &func->upvalue[idx-1] : NONVALIDVALUE;
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}
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}
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}
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/*
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** to be called by 'lua_checkstack' in protected mode, to grow stack
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** capturing memory errors
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*/
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static void growstack (lua_State *L, void *ud) {
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int size = *(int *)ud;
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luaD_growstack(L, size);
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}
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LUA_API int lua_checkstack (lua_State *L, int size) {
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int res;
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CallInfo *ci = L->ci;
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lua_lock(L);
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if (L->stack_last - L->top > size) /* stack large enough? */
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res = 1; /* yes; check is OK */
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else { /* no; need to grow stack */
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int inuse = cast_int(L->top - L->stack) + EXTRA_STACK;
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if (inuse > LUAI_MAXSTACK - size) /* can grow without overflow? */
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res = 0; /* no */
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else /* try to grow stack */
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res = (luaD_rawrunprotected(L, &growstack, &size) == LUA_OK);
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}
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if (res && ci->top < L->top + size)
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ci->top = L->top + size; /* adjust frame top */
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lua_unlock(L);
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return res;
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}
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LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
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int i;
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if (from == to) return;
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lua_lock(to);
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api_checknelems(from, n);
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api_check(from, G(from) == G(to), "moving among independent states");
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api_check(from, to->ci->top - to->top >= n, "not enough elements to move");
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from->top -= n;
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for (i = 0; i < n; i++) {
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setobj2s(to, to->top++, from->top + i);
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}
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lua_unlock(to);
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}
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LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
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lua_CFunction old;
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lua_lock(L);
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old = G(L)->panic;
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G(L)->panic = panicf;
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lua_unlock(L);
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return old;
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}
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LUA_API const lua_Number *lua_version (lua_State *L) {
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static const lua_Number version = LUA_VERSION_NUM;
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if (L == NULL) return &version;
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else return G(L)->version;
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}
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/*
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** basic stack manipulation
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*/
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/*
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** convert an acceptable stack index into an absolute index
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*/
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LUA_API int lua_absindex (lua_State *L, int idx) {
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return (idx > 0 || ispseudo(idx))
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? idx
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: cast_int(L->top - L->ci->func + idx);
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}
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LUA_API int lua_gettop (lua_State *L) {
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return cast_int(L->top - (L->ci->func + 1));
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}
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LUA_API void lua_settop (lua_State *L, int idx) {
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StkId func = L->ci->func;
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lua_lock(L);
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if (idx >= 0) {
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api_check(L, idx <= L->stack_last - (func + 1), "new top too large");
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while (L->top < (func + 1) + idx)
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setnilvalue(L->top++);
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L->top = (func + 1) + idx;
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}
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else {
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api_check(L, -(idx+1) <= (L->top - (func + 1)), "invalid new top");
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L->top += idx+1; /* `subtract' index (index is negative) */
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}
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lua_unlock(L);
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}
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LUA_API void lua_remove (lua_State *L, int idx) {
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StkId p;
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lua_lock(L);
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p = index2addr(L, idx);
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api_checkstackindex(L, idx, p);
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while (++p < L->top) setobjs2s(L, p-1, p);
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L->top--;
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lua_unlock(L);
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}
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LUA_API void lua_insert (lua_State *L, int idx) {
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StkId p;
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StkId q;
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lua_lock(L);
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p = index2addr(L, idx);
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api_checkstackindex(L, idx, p);
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for (q = L->top; q > p; q--) /* use L->top as a temporary */
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setobjs2s(L, q, q - 1);
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setobjs2s(L, p, L->top);
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lua_unlock(L);
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}
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static void moveto (lua_State *L, TValue *fr, int idx) {
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TValue *to = index2addr(L, idx);
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api_checkvalidindex(L, to);
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setobj(L, to, fr);
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if (idx < LUA_REGISTRYINDEX) /* function upvalue? */
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luaC_barrier(L, clCvalue(L->ci->func), fr);
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/* LUA_REGISTRYINDEX does not need gc barrier
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(collector revisits it before finishing collection) */
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}
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LUA_API void lua_replace (lua_State *L, int idx) {
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lua_lock(L);
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api_checknelems(L, 1);
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moveto(L, L->top - 1, idx);
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L->top--;
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lua_unlock(L);
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}
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LUA_API void lua_copy (lua_State *L, int fromidx, int toidx) {
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TValue *fr;
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lua_lock(L);
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fr = index2addr(L, fromidx);
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moveto(L, fr, toidx);
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lua_unlock(L);
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}
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LUA_API void lua_pushvalue (lua_State *L, int idx) {
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lua_lock(L);
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setobj2s(L, L->top, index2addr(L, idx));
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api_incr_top(L);
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lua_unlock(L);
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}
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/*
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** access functions (stack -> C)
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*/
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LUA_API int lua_type (lua_State *L, int idx) {
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StkId o = index2addr(L, idx);
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return (isvalid(o) ? ttypenv(o) : LUA_TNONE);
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}
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LUA_API const char *lua_typename (lua_State *L, int t) {
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UNUSED(L);
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return ttypename(t);
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}
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LUA_API int lua_iscfunction (lua_State *L, int idx) {
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StkId o = index2addr(L, idx);
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return (ttislcf(o) || (ttisCclosure(o)));
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}
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LUA_API int lua_isnumber (lua_State *L, int idx) {
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TValue n;
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const TValue *o = index2addr(L, idx);
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return tonumber(o, &n);
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}
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LUA_API int lua_isstring (lua_State *L, int idx) {
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int t = lua_type(L, idx);
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return (t == LUA_TSTRING || t == LUA_TNUMBER);
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}
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LUA_API int lua_isuserdata (lua_State *L, int idx) {
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const TValue *o = index2addr(L, idx);
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return (ttisuserdata(o) || ttislightuserdata(o));
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}
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LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
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StkId o1 = index2addr(L, index1);
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StkId o2 = index2addr(L, index2);
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return (isvalid(o1) && isvalid(o2)) ? luaV_rawequalobj(o1, o2) : 0;
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}
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LUA_API void lua_arith (lua_State *L, int op) {
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StkId o1; /* 1st operand */
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StkId o2; /* 2nd operand */
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lua_lock(L);
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if (op != LUA_OPUNM) /* all other operations expect two operands */
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api_checknelems(L, 2);
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else { /* for unary minus, add fake 2nd operand */
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api_checknelems(L, 1);
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setobjs2s(L, L->top, L->top - 1);
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L->top++;
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}
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o1 = L->top - 2;
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o2 = L->top - 1;
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if (ttisnumber(o1) && ttisnumber(o2)) {
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setnvalue(o1, luaO_arith(op, nvalue(o1), nvalue(o2)));
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}
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else
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luaV_arith(L, o1, o1, o2, cast(TMS, op - LUA_OPADD + TM_ADD));
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L->top--;
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lua_unlock(L);
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}
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LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) {
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StkId o1, o2;
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int i = 0;
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lua_lock(L); /* may call tag method */
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o1 = index2addr(L, index1);
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o2 = index2addr(L, index2);
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if (isvalid(o1) && isvalid(o2)) {
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switch (op) {
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case LUA_OPEQ: i = equalobj(L, o1, o2); break;
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case LUA_OPLT: i = luaV_lessthan(L, o1, o2); break;
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case LUA_OPLE: i = luaV_lessequal(L, o1, o2); break;
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default: api_check(L, 0, "invalid option");
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}
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}
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lua_unlock(L);
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return i;
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}
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LUA_API lua_Number lua_tonumberx (lua_State *L, int idx, int *isnum) {
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TValue n;
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const TValue *o = index2addr(L, idx);
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if (tonumber(o, &n)) {
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if (isnum) *isnum = 1;
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return nvalue(o);
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}
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else {
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if (isnum) *isnum = 0;
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return 0;
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}
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}
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LUA_API lua_Integer lua_tointegerx (lua_State *L, int idx, int *isnum) {
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TValue n;
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const TValue *o = index2addr(L, idx);
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if (tonumber(o, &n)) {
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lua_Integer res;
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lua_Number num = nvalue(o);
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lua_number2integer(res, num);
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if (isnum) *isnum = 1;
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return res;
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}
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else {
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if (isnum) *isnum = 0;
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return 0;
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}
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}
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LUA_API lua_Unsigned lua_tounsignedx (lua_State *L, int idx, int *isnum) {
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TValue n;
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const TValue *o = index2addr(L, idx);
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if (tonumber(o, &n)) {
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lua_Unsigned res;
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lua_Number num = nvalue(o);
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lua_number2unsigned(res, num);
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if (isnum) *isnum = 1;
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return res;
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}
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else {
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if (isnum) *isnum = 0;
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return 0;
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}
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}
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LUA_API int lua_toboolean (lua_State *L, int idx) {
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const TValue *o = index2addr(L, idx);
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return !l_isfalse(o);
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}
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LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
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StkId o = index2addr(L, idx);
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if (!ttisstring(o)) {
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lua_lock(L); /* `luaV_tostring' may create a new string */
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if (!luaV_tostring(L, o)) { /* conversion failed? */
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if (len != NULL) *len = 0;
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lua_unlock(L);
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return NULL;
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}
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luaC_checkGC(L);
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o = index2addr(L, idx); /* previous call may reallocate the stack */
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lua_unlock(L);
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}
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if (len != NULL) *len = tsvalue(o)->len;
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return svalue(o);
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}
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LUA_API size_t lua_rawlen (lua_State *L, int idx) {
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StkId o = index2addr(L, idx);
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switch (ttypenv(o)) {
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case LUA_TSTRING: return tsvalue(o)->len;
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case LUA_TUSERDATA: return uvalue(o)->len;
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case LUA_TTABLE: return luaH_getn(hvalue(o));
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default: return 0;
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}
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}
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LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
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StkId o = index2addr(L, idx);
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if (ttislcf(o)) return fvalue(o);
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else if (ttisCclosure(o))
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return clCvalue(o)->f;
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else return NULL; /* not a C function */
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}
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LUA_API void *lua_touserdata (lua_State *L, int idx) {
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StkId o = index2addr(L, idx);
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switch (ttypenv(o)) {
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case LUA_TUSERDATA: return ((void *)(rawuvalue(o) + 1));
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case LUA_TLIGHTUSERDATA: return pvalue(o);
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default: return NULL;
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}
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}
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LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
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StkId o = index2addr(L, idx);
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return (!ttisthread(o)) ? NULL : thvalue(o);
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}
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LUA_API const void *lua_topointer (lua_State *L, int idx) {
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StkId o = index2addr(L, idx);
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switch (ttype(o)) {
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case LUA_TTABLE: return hvalue(o);
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case LUA_TLCL: return clLvalue(o);
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case LUA_TCCL: return clCvalue(o);
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case LUA_TLCF: return cast(void *, cast(size_t, fvalue(o)));
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case LUA_TTHREAD: return thvalue(o);
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case LUA_TUSERDATA:
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case LUA_TLIGHTUSERDATA:
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return lua_touserdata(L, idx);
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default: return NULL;
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}
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}
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/*
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** push functions (C -> stack)
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*/
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LUA_API void lua_pushnil (lua_State *L) {
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lua_lock(L);
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setnilvalue(L->top);
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
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lua_lock(L);
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setnvalue(L->top, n);
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luai_checknum(L, L->top,
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luaG_runerror(L, "C API - attempt to push a signaling NaN"));
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
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lua_lock(L);
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setnvalue(L->top, cast_num(n));
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushunsigned (lua_State *L, lua_Unsigned u) {
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lua_Number n;
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lua_lock(L);
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n = lua_unsigned2number(u);
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setnvalue(L->top, n);
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API const char *lua_pushlstring (lua_State *L, const char *s, size_t len) {
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TString *ts;
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lua_lock(L);
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luaC_checkGC(L);
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ts = luaS_newlstr(L, s, len);
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setsvalue2s(L, L->top, ts);
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api_incr_top(L);
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lua_unlock(L);
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return getstr(ts);
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}
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LUA_API const char *lua_pushstring (lua_State *L, const char *s) {
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if (s == NULL) {
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lua_pushnil(L);
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return NULL;
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}
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else {
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TString *ts;
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lua_lock(L);
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luaC_checkGC(L);
|
|
ts = luaS_new(L, s);
|
|
setsvalue2s(L, L->top, ts);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
return getstr(ts);
|
|
}
|
|
}
|
|
|
|
|
|
LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
|
|
va_list argp) {
|
|
const char *ret;
|
|
lua_lock(L);
|
|
luaC_checkGC(L);
|
|
ret = luaO_pushvfstring(L, fmt, argp);
|
|
lua_unlock(L);
|
|
return ret;
|
|
}
|
|
|
|
|
|
LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
|
|
const char *ret;
|
|
va_list argp;
|
|
lua_lock(L);
|
|
luaC_checkGC(L);
|
|
va_start(argp, fmt);
|
|
ret = luaO_pushvfstring(L, fmt, argp);
|
|
va_end(argp);
|
|
lua_unlock(L);
|
|
return ret;
|
|
}
|
|
|
|
|
|
LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
|
|
lua_lock(L);
|
|
if (n == 0) {
|
|
setfvalue(L->top, fn);
|
|
}
|
|
else {
|
|
Closure *cl;
|
|
api_checknelems(L, n);
|
|
api_check(L, n <= MAXUPVAL, "upvalue index too large");
|
|
luaC_checkGC(L);
|
|
cl = luaF_newCclosure(L, n);
|
|
cl->c.f = fn;
|
|
L->top -= n;
|
|
while (n--)
|
|
setobj2n(L, &cl->c.upvalue[n], L->top + n);
|
|
setclCvalue(L, L->top, cl);
|
|
}
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_pushboolean (lua_State *L, int b) {
|
|
lua_lock(L);
|
|
setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
|
|
lua_lock(L);
|
|
setpvalue(L->top, p);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API int lua_pushthread (lua_State *L) {
|
|
lua_lock(L);
|
|
setthvalue(L, L->top, L);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
return (G(L)->mainthread == L);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
** get functions (Lua -> stack)
|
|
*/
|
|
|
|
|
|
LUA_API void lua_getglobal (lua_State *L, const char *var) {
|
|
Table *reg = hvalue(&G(L)->l_registry);
|
|
const TValue *gt; /* global table */
|
|
lua_lock(L);
|
|
gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
|
|
setsvalue2s(L, L->top++, luaS_new(L, var));
|
|
luaV_gettable(L, gt, L->top - 1, L->top - 1);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_gettable (lua_State *L, int idx) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
t = index2addr(L, idx);
|
|
luaV_gettable(L, t, L->top - 1, L->top - 1);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
t = index2addr(L, idx);
|
|
setsvalue2s(L, L->top, luaS_new(L, k));
|
|
api_incr_top(L);
|
|
luaV_gettable(L, t, L->top - 1, L->top - 1);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawget (lua_State *L, int idx) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
t = index2addr(L, idx);
|
|
api_check(L, ttistable(t), "table expected");
|
|
setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawgeti (lua_State *L, int idx, int n) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
t = index2addr(L, idx);
|
|
api_check(L, ttistable(t), "table expected");
|
|
setobj2s(L, L->top, luaH_getint(hvalue(t), n));
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawgetp (lua_State *L, int idx, const void *p) {
|
|
StkId t;
|
|
TValue k;
|
|
lua_lock(L);
|
|
t = index2addr(L, idx);
|
|
api_check(L, ttistable(t), "table expected");
|
|
setpvalue(&k, cast(void *, p));
|
|
setobj2s(L, L->top, luaH_get(hvalue(t), &k));
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
|
|
Table *t;
|
|
lua_lock(L);
|
|
luaC_checkGC(L);
|
|
t = luaH_new(L);
|
|
sethvalue(L, L->top, t);
|
|
api_incr_top(L);
|
|
if (narray > 0 || nrec > 0)
|
|
luaH_resize(L, t, narray, nrec);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API int lua_getmetatable (lua_State *L, int objindex) {
|
|
const TValue *obj;
|
|
Table *mt = NULL;
|
|
int res;
|
|
lua_lock(L);
|
|
obj = index2addr(L, objindex);
|
|
switch (ttypenv(obj)) {
|
|
case LUA_TTABLE:
|
|
mt = hvalue(obj)->metatable;
|
|
break;
|
|
case LUA_TUSERDATA:
|
|
mt = uvalue(obj)->metatable;
|
|
break;
|
|
default:
|
|
mt = G(L)->mt[ttypenv(obj)];
|
|
break;
|
|
}
|
|
if (mt == NULL)
|
|
res = 0;
|
|
else {
|
|
sethvalue(L, L->top, mt);
|
|
api_incr_top(L);
|
|
res = 1;
|
|
}
|
|
lua_unlock(L);
|
|
return res;
|
|
}
|
|
|
|
|
|
LUA_API void lua_getuservalue (lua_State *L, int idx) {
|
|
StkId o;
|
|
lua_lock(L);
|
|
o = index2addr(L, idx);
|
|
api_check(L, ttisuserdata(o), "userdata expected");
|
|
if (uvalue(o)->env) {
|
|
sethvalue(L, L->top, uvalue(o)->env);
|
|
} else
|
|
setnilvalue(L->top);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
/*
|
|
** set functions (stack -> Lua)
|
|
*/
|
|
|
|
|
|
LUA_API void lua_setglobal (lua_State *L, const char *var) {
|
|
Table *reg = hvalue(&G(L)->l_registry);
|
|
const TValue *gt; /* global table */
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
|
|
setsvalue2s(L, L->top++, luaS_new(L, var));
|
|
luaV_settable(L, gt, L->top - 1, L->top - 2);
|
|
L->top -= 2; /* pop value and key */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_settable (lua_State *L, int idx) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
api_checknelems(L, 2);
|
|
t = index2addr(L, idx);
|
|
luaV_settable(L, t, L->top - 2, L->top - 1);
|
|
L->top -= 2; /* pop index and value */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
t = index2addr(L, idx);
|
|
setsvalue2s(L, L->top++, luaS_new(L, k));
|
|
luaV_settable(L, t, L->top - 1, L->top - 2);
|
|
L->top -= 2; /* pop value and key */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawset (lua_State *L, int idx) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
api_checknelems(L, 2);
|
|
t = index2addr(L, idx);
|
|
api_check(L, ttistable(t), "table expected");
|
|
setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
|
|
invalidateTMcache(hvalue(t));
|
|
luaC_barrierback(L, gcvalue(t), L->top-1);
|
|
L->top -= 2;
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
t = index2addr(L, idx);
|
|
api_check(L, ttistable(t), "table expected");
|
|
luaH_setint(L, hvalue(t), n, L->top - 1);
|
|
luaC_barrierback(L, gcvalue(t), L->top-1);
|
|
L->top--;
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawsetp (lua_State *L, int idx, const void *p) {
|
|
StkId t;
|
|
TValue k;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
t = index2addr(L, idx);
|
|
api_check(L, ttistable(t), "table expected");
|
|
setpvalue(&k, cast(void *, p));
|
|
setobj2t(L, luaH_set(L, hvalue(t), &k), L->top - 1);
|
|
luaC_barrierback(L, gcvalue(t), L->top - 1);
|
|
L->top--;
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API int lua_setmetatable (lua_State *L, int objindex) {
|
|
TValue *obj;
|
|
Table *mt;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
obj = index2addr(L, objindex);
|
|
if (ttisnil(L->top - 1))
|
|
mt = NULL;
|
|
else {
|
|
api_check(L, ttistable(L->top - 1), "table expected");
|
|
mt = hvalue(L->top - 1);
|
|
}
|
|
switch (ttypenv(obj)) {
|
|
case LUA_TTABLE: {
|
|
hvalue(obj)->metatable = mt;
|
|
if (mt) {
|
|
luaC_objbarrierback(L, gcvalue(obj), mt);
|
|
luaC_checkfinalizer(L, gcvalue(obj), mt);
|
|
}
|
|
break;
|
|
}
|
|
case LUA_TUSERDATA: {
|
|
uvalue(obj)->metatable = mt;
|
|
if (mt) {
|
|
luaC_objbarrier(L, rawuvalue(obj), mt);
|
|
luaC_checkfinalizer(L, gcvalue(obj), mt);
|
|
}
|
|
break;
|
|
}
|
|
default: {
|
|
G(L)->mt[ttypenv(obj)] = mt;
|
|
break;
|
|
}
|
|
}
|
|
L->top--;
|
|
lua_unlock(L);
|
|
return 1;
|
|
}
|
|
|
|
|
|
LUA_API void lua_setuservalue (lua_State *L, int idx) {
|
|
StkId o;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
o = index2addr(L, idx);
|
|
api_check(L, ttisuserdata(o), "userdata expected");
|
|
if (ttisnil(L->top - 1))
|
|
uvalue(o)->env = NULL;
|
|
else {
|
|
api_check(L, ttistable(L->top - 1), "table expected");
|
|
uvalue(o)->env = hvalue(L->top - 1);
|
|
luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
|
|
}
|
|
L->top--;
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
/*
|
|
** `load' and `call' functions (run Lua code)
|
|
*/
|
|
|
|
|
|
#define checkresults(L,na,nr) \
|
|
api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)), \
|
|
"results from function overflow current stack size")
|
|
|
|
|
|
LUA_API int lua_getctx (lua_State *L, int *ctx) {
|
|
if (L->ci->callstatus & CIST_YIELDED) {
|
|
if (ctx) *ctx = L->ci->u.c.ctx;
|
|
return L->ci->u.c.status;
|
|
}
|
|
else return LUA_OK;
|
|
}
|
|
|
|
|
|
LUA_API void lua_callk (lua_State *L, int nargs, int nresults, int ctx,
|
|
lua_CFunction k) {
|
|
StkId func;
|
|
lua_lock(L);
|
|
api_check(L, k == NULL || !isLua(L->ci),
|
|
"cannot use continuations inside hooks");
|
|
api_checknelems(L, nargs+1);
|
|
api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
|
|
checkresults(L, nargs, nresults);
|
|
func = L->top - (nargs+1);
|
|
if (k != NULL && L->nny == 0) { /* need to prepare continuation? */
|
|
L->ci->u.c.k = k; /* save continuation */
|
|
L->ci->u.c.ctx = ctx; /* save context */
|
|
luaD_call(L, func, nresults, 1); /* do the call */
|
|
}
|
|
else /* no continuation or no yieldable */
|
|
luaD_call(L, func, nresults, 0); /* just do the call */
|
|
adjustresults(L, nresults);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
** Execute a protected call.
|
|
*/
|
|
struct CallS { /* data to `f_call' */
|
|
StkId func;
|
|
int nresults;
|
|
};
|
|
|
|
|
|
static void f_call (lua_State *L, void *ud) {
|
|
struct CallS *c = cast(struct CallS *, ud);
|
|
luaD_call(L, c->func, c->nresults, 0);
|
|
}
|
|
|
|
|
|
|
|
LUA_API int lua_pcallk (lua_State *L, int nargs, int nresults, int errfunc,
|
|
int ctx, lua_CFunction k) {
|
|
struct CallS c;
|
|
int status;
|
|
ptrdiff_t func;
|
|
lua_lock(L);
|
|
api_check(L, k == NULL || !isLua(L->ci),
|
|
"cannot use continuations inside hooks");
|
|
api_checknelems(L, nargs+1);
|
|
api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
|
|
checkresults(L, nargs, nresults);
|
|
if (errfunc == 0)
|
|
func = 0;
|
|
else {
|
|
StkId o = index2addr(L, errfunc);
|
|
api_checkstackindex(L, errfunc, o);
|
|
func = savestack(L, o);
|
|
}
|
|
c.func = L->top - (nargs+1); /* function to be called */
|
|
if (k == NULL || L->nny > 0) { /* no continuation or no yieldable? */
|
|
c.nresults = nresults; /* do a 'conventional' protected call */
|
|
status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
|
|
}
|
|
else { /* prepare continuation (call is already protected by 'resume') */
|
|
CallInfo *ci = L->ci;
|
|
ci->u.c.k = k; /* save continuation */
|
|
ci->u.c.ctx = ctx; /* save context */
|
|
/* save information for error recovery */
|
|
ci->extra = savestack(L, c.func);
|
|
ci->u.c.old_allowhook = L->allowhook;
|
|
ci->u.c.old_errfunc = L->errfunc;
|
|
L->errfunc = func;
|
|
/* mark that function may do error recovery */
|
|
ci->callstatus |= CIST_YPCALL;
|
|
luaD_call(L, c.func, nresults, 1); /* do the call */
|
|
ci->callstatus &= ~CIST_YPCALL;
|
|
L->errfunc = ci->u.c.old_errfunc;
|
|
status = LUA_OK; /* if it is here, there were no errors */
|
|
}
|
|
adjustresults(L, nresults);
|
|
lua_unlock(L);
|
|
return status;
|
|
}
|
|
|
|
|
|
LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
|
|
const char *chunkname, const char *mode) {
|
|
ZIO z;
|
|
int status;
|
|
lua_lock(L);
|
|
if (!chunkname) chunkname = "?";
|
|
luaZ_init(L, &z, reader, data);
|
|
status = luaD_protectedparser(L, &z, chunkname, mode);
|
|
if (status == LUA_OK) { /* no errors? */
|
|
LClosure *f = clLvalue(L->top - 1); /* get newly created function */
|
|
if (f->nupvalues == 1) { /* does it have one upvalue? */
|
|
/* get global table from registry */
|
|
Table *reg = hvalue(&G(L)->l_registry);
|
|
const TValue *gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
|
|
/* set global table as 1st upvalue of 'f' (may be LUA_ENV) */
|
|
setobj(L, f->upvals[0]->v, gt);
|
|
luaC_barrier(L, f->upvals[0], gt);
|
|
}
|
|
}
|
|
lua_unlock(L);
|
|
return status;
|
|
}
|
|
|
|
#if defined(LUA_USE_DUMP)
|
|
LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) {
|
|
int status;
|
|
TValue *o;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
o = L->top - 1;
|
|
if (isLfunction(o))
|
|
status = luaU_dump(L, getproto(o), writer, data, 0);
|
|
else
|
|
status = 1;
|
|
lua_unlock(L);
|
|
return status;
|
|
}
|
|
#endif
|
|
|
|
LUA_API int lua_status (lua_State *L) {
|
|
return L->status;
|
|
}
|
|
|
|
|
|
/*
|
|
** Garbage-collection function
|
|
*/
|
|
|
|
LUA_API int lua_gc (lua_State *L, int what, int data) {
|
|
int res = 0;
|
|
global_State *g;
|
|
lua_lock(L);
|
|
g = G(L);
|
|
switch (what) {
|
|
case LUA_GCSTOP: {
|
|
g->gcrunning = 0;
|
|
break;
|
|
}
|
|
case LUA_GCRESTART: {
|
|
luaE_setdebt(g, 0);
|
|
g->gcrunning = 1;
|
|
break;
|
|
}
|
|
case LUA_GCCOLLECT: {
|
|
luaC_fullgc(L, 0);
|
|
break;
|
|
}
|
|
case LUA_GCCOUNT: {
|
|
/* GC values are expressed in Kbytes: #bytes/2^10 */
|
|
res = cast_int(gettotalbytes(g) >> 10);
|
|
break;
|
|
}
|
|
case LUA_GCCOUNTB: {
|
|
res = cast_int(gettotalbytes(g) & 0x3ff);
|
|
break;
|
|
}
|
|
case LUA_GCSTEP: {
|
|
if (g->gckind == KGC_GEN) { /* generational mode? */
|
|
res = (g->GCestimate == 0); /* true if it will do major collection */
|
|
luaC_forcestep(L); /* do a single step */
|
|
}
|
|
else {
|
|
lu_mem debt = cast(lu_mem, data) * 1024 - GCSTEPSIZE;
|
|
if (g->gcrunning)
|
|
debt += g->GCdebt; /* include current debt */
|
|
luaE_setdebt(g, debt);
|
|
luaC_forcestep(L);
|
|
if (g->gcstate == GCSpause) /* end of cycle? */
|
|
res = 1; /* signal it */
|
|
}
|
|
break;
|
|
}
|
|
case LUA_GCSETPAUSE: {
|
|
res = g->gcpause;
|
|
g->gcpause = data;
|
|
break;
|
|
}
|
|
case LUA_GCSETMAJORINC: {
|
|
res = g->gcmajorinc;
|
|
g->gcmajorinc = data;
|
|
break;
|
|
}
|
|
case LUA_GCSETSTEPMUL: {
|
|
res = g->gcstepmul;
|
|
g->gcstepmul = data;
|
|
break;
|
|
}
|
|
case LUA_GCISRUNNING: {
|
|
res = g->gcrunning;
|
|
break;
|
|
}
|
|
case LUA_GCGEN: { /* change collector to generational mode */
|
|
luaC_changemode(L, KGC_GEN);
|
|
break;
|
|
}
|
|
case LUA_GCINC: { /* change collector to incremental mode */
|
|
luaC_changemode(L, KGC_NORMAL);
|
|
break;
|
|
}
|
|
default: res = -1; /* invalid option */
|
|
}
|
|
lua_unlock(L);
|
|
return res;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
** miscellaneous functions
|
|
*/
|
|
|
|
|
|
LUA_API int lua_error (lua_State *L) {
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
luaG_errormsg(L);
|
|
/* code unreachable; will unlock when control actually leaves the kernel */
|
|
return 0; /* to avoid warnings */
|
|
}
|
|
|
|
|
|
LUA_API int lua_next (lua_State *L, int idx) {
|
|
StkId t;
|
|
int more;
|
|
lua_lock(L);
|
|
t = index2addr(L, idx);
|
|
api_check(L, ttistable(t), "table expected");
|
|
more = luaH_next(L, hvalue(t), L->top - 1);
|
|
if (more) {
|
|
api_incr_top(L);
|
|
}
|
|
else /* no more elements */
|
|
L->top -= 1; /* remove key */
|
|
lua_unlock(L);
|
|
return more;
|
|
}
|
|
|
|
|
|
LUA_API void lua_concat (lua_State *L, int n) {
|
|
lua_lock(L);
|
|
api_checknelems(L, n);
|
|
if (n >= 2) {
|
|
luaC_checkGC(L);
|
|
luaV_concat(L, n);
|
|
}
|
|
else if (n == 0) { /* push empty string */
|
|
setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
|
|
api_incr_top(L);
|
|
}
|
|
/* else n == 1; nothing to do */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_len (lua_State *L, int idx) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
t = index2addr(L, idx);
|
|
luaV_objlen(L, L->top, t);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
|
|
lua_Alloc f;
|
|
lua_lock(L);
|
|
if (ud) *ud = G(L)->ud;
|
|
f = G(L)->frealloc;
|
|
lua_unlock(L);
|
|
return f;
|
|
}
|
|
|
|
|
|
LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {
|
|
lua_lock(L);
|
|
G(L)->ud = ud;
|
|
G(L)->frealloc = f;
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
|
|
Udata *u;
|
|
lua_lock(L);
|
|
luaC_checkGC(L);
|
|
u = luaS_newudata(L, size, NULL);
|
|
setuvalue(L, L->top, u);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
return u + 1;
|
|
}
|
|
|
|
|
|
|
|
static const char *aux_upvalue (StkId fi, int n, TValue **val,
|
|
GCObject **owner) {
|
|
switch (ttype(fi)) {
|
|
case LUA_TCCL: { /* C closure */
|
|
CClosure *f = clCvalue(fi);
|
|
if (!(1 <= n && n <= f->nupvalues)) return NULL;
|
|
*val = &f->upvalue[n-1];
|
|
if (owner) *owner = obj2gco(f);
|
|
return "";
|
|
}
|
|
case LUA_TLCL: { /* Lua closure */
|
|
LClosure *f = clLvalue(fi);
|
|
TString *name;
|
|
Proto *p = f->p;
|
|
if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
|
|
*val = f->upvals[n-1]->v;
|
|
if (owner) *owner = obj2gco(f->upvals[n - 1]);
|
|
name = p->upvalues[n-1].name;
|
|
return (name == NULL) ? "" : getstr(name);
|
|
}
|
|
default: return NULL; /* not a closure */
|
|
}
|
|
}
|
|
|
|
|
|
LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
|
|
const char *name;
|
|
TValue *val = NULL; /* to avoid warnings */
|
|
lua_lock(L);
|
|
name = aux_upvalue(index2addr(L, funcindex), n, &val, NULL);
|
|
if (name) {
|
|
setobj2s(L, L->top, val);
|
|
api_incr_top(L);
|
|
}
|
|
lua_unlock(L);
|
|
return name;
|
|
}
|
|
|
|
|
|
LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
|
|
const char *name;
|
|
TValue *val = NULL; /* to avoid warnings */
|
|
GCObject *owner = NULL; /* to avoid warnings */
|
|
StkId fi;
|
|
lua_lock(L);
|
|
fi = index2addr(L, funcindex);
|
|
api_checknelems(L, 1);
|
|
name = aux_upvalue(fi, n, &val, &owner);
|
|
if (name) {
|
|
L->top--;
|
|
setobj(L, val, L->top);
|
|
luaC_barrier(L, owner, L->top);
|
|
}
|
|
lua_unlock(L);
|
|
return name;
|
|
}
|
|
|
|
|
|
static UpVal **getupvalref (lua_State *L, int fidx, int n, LClosure **pf) {
|
|
LClosure *f;
|
|
StkId fi = index2addr(L, fidx);
|
|
api_check(L, ttisLclosure(fi), "Lua function expected");
|
|
f = clLvalue(fi);
|
|
api_check(L, (1 <= n && n <= f->p->sizeupvalues), "invalid upvalue index");
|
|
if (pf) *pf = f;
|
|
return &f->upvals[n - 1]; /* get its upvalue pointer */
|
|
}
|
|
|
|
|
|
LUA_API void *lua_upvalueid (lua_State *L, int fidx, int n) {
|
|
StkId fi = index2addr(L, fidx);
|
|
switch (ttype(fi)) {
|
|
case LUA_TLCL: { /* lua closure */
|
|
return *getupvalref(L, fidx, n, NULL);
|
|
}
|
|
case LUA_TCCL: { /* C closure */
|
|
CClosure *f = clCvalue(fi);
|
|
api_check(L, 1 <= n && n <= f->nupvalues, "invalid upvalue index");
|
|
return &f->upvalue[n - 1];
|
|
}
|
|
default: {
|
|
api_check(L, 0, "closure expected");
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1,
|
|
int fidx2, int n2) {
|
|
LClosure *f1;
|
|
UpVal **up1 = getupvalref(L, fidx1, n1, &f1);
|
|
UpVal **up2 = getupvalref(L, fidx2, n2, NULL);
|
|
*up1 = *up2;
|
|
luaC_objbarrier(L, f1, *up2);
|
|
}
|
|
|
|
#if defined(_KERNEL)
|
|
|
|
static int __init
|
|
lua_init(void)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
static void __exit
|
|
lua_fini(void)
|
|
{
|
|
}
|
|
|
|
module_init(lua_init);
|
|
module_exit(lua_fini);
|
|
|
|
MODULE_DESCRIPTION("Lua Interpreter for ZFS");
|
|
MODULE_AUTHOR("Lua.org");
|
|
MODULE_LICENSE("MIT");
|
|
MODULE_VERSION(ZFS_META_VERSION "-" ZFS_META_RELEASE);
|
|
|
|
EXPORT_SYMBOL(lua_absindex);
|
|
EXPORT_SYMBOL(lua_atpanic);
|
|
EXPORT_SYMBOL(lua_checkstack);
|
|
EXPORT_SYMBOL(lua_close);
|
|
EXPORT_SYMBOL(lua_createtable);
|
|
EXPORT_SYMBOL(lua_error);
|
|
EXPORT_SYMBOL(lua_getfield);
|
|
EXPORT_SYMBOL(lua_gettable);
|
|
EXPORT_SYMBOL(lua_gettop);
|
|
EXPORT_SYMBOL(lua_isnumber);
|
|
EXPORT_SYMBOL(lua_isstring);
|
|
EXPORT_SYMBOL(lua_newstate);
|
|
EXPORT_SYMBOL(lua_newuserdata);
|
|
EXPORT_SYMBOL(lua_next);
|
|
EXPORT_SYMBOL(lua_pcallk);
|
|
EXPORT_SYMBOL(lua_pushboolean);
|
|
EXPORT_SYMBOL(lua_pushcclosure);
|
|
EXPORT_SYMBOL(lua_pushfstring);
|
|
EXPORT_SYMBOL(lua_pushinteger);
|
|
EXPORT_SYMBOL(lua_pushlightuserdata);
|
|
EXPORT_SYMBOL(lua_pushnil);
|
|
EXPORT_SYMBOL(lua_pushnumber);
|
|
EXPORT_SYMBOL(lua_pushstring);
|
|
EXPORT_SYMBOL(lua_pushvalue);
|
|
EXPORT_SYMBOL(lua_pushvfstring);
|
|
EXPORT_SYMBOL(lua_remove);
|
|
EXPORT_SYMBOL(lua_replace);
|
|
EXPORT_SYMBOL(lua_setfield);
|
|
EXPORT_SYMBOL(lua_setglobal);
|
|
EXPORT_SYMBOL(lua_sethook);
|
|
EXPORT_SYMBOL(lua_setmetatable);
|
|
EXPORT_SYMBOL(lua_settable);
|
|
EXPORT_SYMBOL(lua_settop);
|
|
EXPORT_SYMBOL(lua_toboolean);
|
|
EXPORT_SYMBOL(lua_tointegerx);
|
|
EXPORT_SYMBOL(lua_tolstring);
|
|
EXPORT_SYMBOL(lua_tonumberx);
|
|
EXPORT_SYMBOL(lua_touserdata);
|
|
EXPORT_SYMBOL(lua_type);
|
|
EXPORT_SYMBOL(lua_typename);
|
|
|
|
#endif
|
|
/* END CSTYLED */
|