diff options
Diffstat (limited to 'plugins/MirLua/src/lua/lvm.c')
| -rw-r--r-- | plugins/MirLua/src/lua/lvm.c | 1303 |
1 files changed, 0 insertions, 1303 deletions
diff --git a/plugins/MirLua/src/lua/lvm.c b/plugins/MirLua/src/lua/lvm.c deleted file mode 100644 index aba7ace817..0000000000 --- a/plugins/MirLua/src/lua/lvm.c +++ /dev/null @@ -1,1303 +0,0 @@ -/* -** $Id: lvm.c,v 2.265 2015/11/23 11:30:45 roberto Exp $ -** Lua virtual machine -** See Copyright Notice in lua.h -*/ - -#define lvm_c -#define LUA_CORE - -#include "lprefix.h" - -#include <float.h> -#include <limits.h> -#include <math.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "lua.h" - -#include "ldebug.h" -#include "ldo.h" -#include "lfunc.h" -#include "lgc.h" -#include "lobject.h" -#include "lopcodes.h" -#include "lstate.h" -#include "lstring.h" -#include "ltable.h" -#include "ltm.h" -#include "lvm.h" - - -/* limit for table tag-method chains (to avoid loops) */ -#define MAXTAGLOOP 2000 - - - -/* -** 'l_intfitsf' checks whether a given integer can be converted to a -** float without rounding. Used in comparisons. Left undefined if -** all integers fit in a float precisely. -*/ -#if !defined(l_intfitsf) - -/* number of bits in the mantissa of a float */ -#define NBM (l_mathlim(MANT_DIG)) - -/* -** Check whether some integers may not fit in a float, that is, whether -** (maxinteger >> NBM) > 0 (that implies (1 << NBM) <= maxinteger). -** (The shifts are done in parts to avoid shifting by more than the size -** of an integer. In a worst case, NBM == 113 for long double and -** sizeof(integer) == 32.) -*/ -#if ((((LUA_MAXINTEGER >> (NBM / 4)) >> (NBM / 4)) >> (NBM / 4)) \ - >> (NBM - (3 * (NBM / 4)))) > 0 - -#define l_intfitsf(i) \ - (-((lua_Integer)1 << NBM) <= (i) && (i) <= ((lua_Integer)1 << NBM)) - -#endif - -#endif - - - -/* -** Try to convert a value to a float. The float case is already handled -** by the macro 'tonumber'. -*/ -int luaV_tonumber_ (const TValue *obj, lua_Number *n) { - TValue v; - if (ttisinteger(obj)) { - *n = cast_num(ivalue(obj)); - return 1; - } - else if (cvt2num(obj) && /* string convertible to number? */ - luaO_str2num(svalue(obj), &v) == vslen(obj) + 1) { - *n = nvalue(&v); /* convert result of 'luaO_str2num' to a float */ - return 1; - } - else - return 0; /* conversion failed */ -} - - -/* -** try to convert a value to an integer, rounding according to 'mode': -** mode == 0: accepts only integral values -** mode == 1: takes the floor of the number -** mode == 2: takes the ceil of the number -*/ -int luaV_tointeger (const TValue *obj, lua_Integer *p, int mode) { - TValue v; - again: - if (ttisfloat(obj)) { - lua_Number n = fltvalue(obj); - lua_Number f = l_floor(n); - if (n != f) { /* not an integral value? */ - if (mode == 0) return 0; /* fails if mode demands integral value */ - else if (mode > 1) /* needs ceil? */ - f += 1; /* convert floor to ceil (remember: n != f) */ - } - return lua_numbertointeger(f, p); - } - else if (ttisinteger(obj)) { - *p = ivalue(obj); - return 1; - } - else if (cvt2num(obj) && - luaO_str2num(svalue(obj), &v) == vslen(obj) + 1) { - obj = &v; - goto again; /* convert result from 'luaO_str2num' to an integer */ - } - return 0; /* conversion failed */ -} - - -/* -** Try to convert a 'for' limit to an integer, preserving the -** semantics of the loop. -** (The following explanation assumes a non-negative step; it is valid -** for negative steps mutatis mutandis.) -** If the limit can be converted to an integer, rounding down, that is -** it. -** Otherwise, check whether the limit can be converted to a number. If -** the number is too large, it is OK to set the limit as LUA_MAXINTEGER, -** which means no limit. If the number is too negative, the loop -** should not run, because any initial integer value is larger than the -** limit. So, it sets the limit to LUA_MININTEGER. 'stopnow' corrects -** the extreme case when the initial value is LUA_MININTEGER, in which -** case the LUA_MININTEGER limit would still run the loop once. -*/ -static int forlimit (const TValue *obj, lua_Integer *p, lua_Integer step, - int *stopnow) { - *stopnow = 0; /* usually, let loops run */ - if (!luaV_tointeger(obj, p, (step < 0 ? 2 : 1))) { /* not fit in integer? */ - lua_Number n; /* try to convert to float */ - if (!tonumber(obj, &n)) /* cannot convert to float? */ - return 0; /* not a number */ - if (luai_numlt(0, n)) { /* if true, float is larger than max integer */ - *p = LUA_MAXINTEGER; - if (step < 0) *stopnow = 1; - } - else { /* float is smaller than min integer */ - *p = LUA_MININTEGER; - if (step >= 0) *stopnow = 1; - } - } - return 1; -} - - -/* -** Complete a table access: if 't' is a table, 'tm' has its metamethod; -** otherwise, 'tm' is NULL. -*/ -void luaV_finishget (lua_State *L, const TValue *t, TValue *key, StkId val, - const TValue *tm) { - int loop; /* counter to avoid infinite loops */ - lua_assert(tm != NULL || !ttistable(t)); - for (loop = 0; loop < MAXTAGLOOP; loop++) { - if (tm == NULL) { /* no metamethod (from a table)? */ - if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_INDEX))) - luaG_typeerror(L, t, "index"); /* no metamethod */ - } - if (ttisfunction(tm)) { /* metamethod is a function */ - luaT_callTM(L, tm, t, key, val, 1); /* call it */ - return; - } - t = tm; /* else repeat access over 'tm' */ - if (luaV_fastget(L,t,key,tm,luaH_get)) { /* try fast track */ - setobj2s(L, val, tm); /* done */ - return; - } - /* else repeat */ - } - luaG_runerror(L, "gettable chain too long; possible loop"); -} - - -/* -** Main function for table assignment (invoking metamethods if needed). -** Compute 't[key] = val' -*/ -void luaV_finishset (lua_State *L, const TValue *t, TValue *key, - StkId val, const TValue *oldval) { - int loop; /* counter to avoid infinite loops */ - for (loop = 0; loop < MAXTAGLOOP; loop++) { - const TValue *tm; - if (oldval != NULL) { - lua_assert(ttistable(t) && ttisnil(oldval)); - /* must check the metamethod */ - if ((tm = fasttm(L, hvalue(t)->metatable, TM_NEWINDEX)) == NULL && - /* no metamethod; is there a previous entry in the table? */ - (oldval != luaO_nilobject || - /* no previous entry; must create one. (The next test is - always true; we only need the assignment.) */ - (oldval = luaH_newkey(L, hvalue(t), key), 1))) { - /* no metamethod and (now) there is an entry with given key */ - setobj2t(L, cast(TValue *, oldval), val); - invalidateTMcache(hvalue(t)); - luaC_barrierback(L, hvalue(t), val); - return; - } - /* else will try the metamethod */ - } - else { /* not a table; check metamethod */ - if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX))) - luaG_typeerror(L, t, "index"); - } - /* try the metamethod */ - if (ttisfunction(tm)) { - luaT_callTM(L, tm, t, key, val, 0); - return; - } - t = tm; /* else repeat assignment over 'tm' */ - if (luaV_fastset(L, t, key, oldval, luaH_get, val)) - return; /* done */ - /* else loop */ - } - luaG_runerror(L, "settable chain too long; possible loop"); -} - - -/* -** Compare two strings 'ls' x 'rs', returning an integer smaller-equal- -** -larger than zero if 'ls' is smaller-equal-larger than 'rs'. -** The code is a little tricky because it allows '\0' in the strings -** and it uses 'strcoll' (to respect locales) for each segments -** of the strings. -*/ -static int l_strcmp (const TString *ls, const TString *rs) { - const char *l = getstr(ls); - size_t ll = tsslen(ls); - const char *r = getstr(rs); - size_t lr = tsslen(rs); - for (;;) { /* for each segment */ - int temp = strcoll(l, r); - if (temp != 0) /* not equal? */ - return temp; /* done */ - else { /* strings are equal up to a '\0' */ - size_t len = strlen(l); /* index of first '\0' in both strings */ - if (len == lr) /* 'rs' is finished? */ - return (len == ll) ? 0 : 1; /* check 'ls' */ - else if (len == ll) /* 'ls' is finished? */ - return -1; /* 'ls' is smaller than 'rs' ('rs' is not finished) */ - /* both strings longer than 'len'; go on comparing after the '\0' */ - len++; - l += len; ll -= len; r += len; lr -= len; - } - } -} - - -/* -** Check whether integer 'i' is less than float 'f'. If 'i' has an -** exact representation as a float ('l_intfitsf'), compare numbers as -** floats. Otherwise, if 'f' is outside the range for integers, result -** is trivial. Otherwise, compare them as integers. (When 'i' has no -** float representation, either 'f' is "far away" from 'i' or 'f' has -** no precision left for a fractional part; either way, how 'f' is -** truncated is irrelevant.) When 'f' is NaN, comparisons must result -** in false. -*/ -static int LTintfloat (lua_Integer i, lua_Number f) { -#if defined(l_intfitsf) - if (!l_intfitsf(i)) { - if (f >= -cast_num(LUA_MININTEGER)) /* -minint == maxint + 1 */ - return 1; /* f >= maxint + 1 > i */ - else if (f > cast_num(LUA_MININTEGER)) /* minint < f <= maxint ? */ - return (i < cast(lua_Integer, f)); /* compare them as integers */ - else /* f <= minint <= i (or 'f' is NaN) --> not(i < f) */ - return 0; - } -#endif - return luai_numlt(cast_num(i), f); /* compare them as floats */ -} - - -/* -** Check whether integer 'i' is less than or equal to float 'f'. -** See comments on previous function. -*/ -static int LEintfloat (lua_Integer i, lua_Number f) { -#if defined(l_intfitsf) - if (!l_intfitsf(i)) { - if (f >= -cast_num(LUA_MININTEGER)) /* -minint == maxint + 1 */ - return 1; /* f >= maxint + 1 > i */ - else if (f >= cast_num(LUA_MININTEGER)) /* minint <= f <= maxint ? */ - return (i <= cast(lua_Integer, f)); /* compare them as integers */ - else /* f < minint <= i (or 'f' is NaN) --> not(i <= f) */ - return 0; - } -#endif - return luai_numle(cast_num(i), f); /* compare them as floats */ -} - - -/* -** Return 'l < r', for numbers. -*/ -static int LTnum (const TValue *l, const TValue *r) { - if (ttisinteger(l)) { - lua_Integer li = ivalue(l); - if (ttisinteger(r)) - return li < ivalue(r); /* both are integers */ - else /* 'l' is int and 'r' is float */ - return LTintfloat(li, fltvalue(r)); /* l < r ? */ - } - else { - lua_Number lf = fltvalue(l); /* 'l' must be float */ - if (ttisfloat(r)) - return luai_numlt(lf, fltvalue(r)); /* both are float */ - else if (luai_numisnan(lf)) /* 'r' is int and 'l' is float */ - return 0; /* NaN < i is always false */ - else /* without NaN, (l < r) <--> not(r <= l) */ - return !LEintfloat(ivalue(r), lf); /* not (r <= l) ? */ - } -} - - -/* -** Return 'l <= r', for numbers. -*/ -static int LEnum (const TValue *l, const TValue *r) { - if (ttisinteger(l)) { - lua_Integer li = ivalue(l); - if (ttisinteger(r)) - return li <= ivalue(r); /* both are integers */ - else /* 'l' is int and 'r' is float */ - return LEintfloat(li, fltvalue(r)); /* l <= r ? */ - } - else { - lua_Number lf = fltvalue(l); /* 'l' must be float */ - if (ttisfloat(r)) - return luai_numle(lf, fltvalue(r)); /* both are float */ - else if (luai_numisnan(lf)) /* 'r' is int and 'l' is float */ - return 0; /* NaN <= i is always false */ - else /* without NaN, (l <= r) <--> not(r < l) */ - return !LTintfloat(ivalue(r), lf); /* not (r < l) ? */ - } -} - - -/* -** Main operation less than; return 'l < r'. -*/ -int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) { - int res; - if (ttisnumber(l) && ttisnumber(r)) /* both operands are numbers? */ - return LTnum(l, r); - else if (ttisstring(l) && ttisstring(r)) /* both are strings? */ - return l_strcmp(tsvalue(l), tsvalue(r)) < 0; - else if ((res = luaT_callorderTM(L, l, r, TM_LT)) < 0) /* no metamethod? */ - luaG_ordererror(L, l, r); /* error */ - return res; -} - - -/* -** Main operation less than or equal to; return 'l <= r'. If it needs -** a metamethod and there is no '__le', try '__lt', based on -** l <= r iff !(r < l) (assuming a total order). If the metamethod -** yields during this substitution, the continuation has to know -** about it (to negate the result of r<l); bit CIST_LEQ in the call -** status keeps that information. -*/ -int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r) { - int res; - if (ttisnumber(l) && ttisnumber(r)) /* both operands are numbers? */ - return LEnum(l, r); - else if (ttisstring(l) && ttisstring(r)) /* both are strings? */ - return l_strcmp(tsvalue(l), tsvalue(r)) <= 0; - else if ((res = luaT_callorderTM(L, l, r, TM_LE)) >= 0) /* try 'le' */ - return res; - else { /* try 'lt': */ - L->ci->callstatus |= CIST_LEQ; /* mark it is doing 'lt' for 'le' */ - res = luaT_callorderTM(L, r, l, TM_LT); - L->ci->callstatus ^= CIST_LEQ; /* clear mark */ - if (res < 0) - luaG_ordererror(L, l, r); - return !res; /* result is negated */ - } -} - - -/* -** Main operation for equality of Lua values; return 't1 == t2'. -** L == NULL means raw equality (no metamethods) -*/ -int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2) { - const TValue *tm; - if (ttype(t1) != ttype(t2)) { /* not the same variant? */ - if (ttnov(t1) != ttnov(t2) || ttnov(t1) != LUA_TNUMBER) - return 0; /* only numbers can be equal with different variants */ - else { /* two numbers with different variants */ - lua_Integer i1, i2; /* compare them as integers */ - return (tointeger(t1, &i1) && tointeger(t2, &i2) && i1 == i2); - } - } - /* values have same type and same variant */ - switch (ttype(t1)) { - case LUA_TNIL: return 1; - case LUA_TNUMINT: return (ivalue(t1) == ivalue(t2)); - case LUA_TNUMFLT: return luai_numeq(fltvalue(t1), fltvalue(t2)); - case LUA_TBOOLEAN: return bvalue(t1) == bvalue(t2); /* true must be 1 !! */ - case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2); - case LUA_TLCF: return fvalue(t1) == fvalue(t2); - case LUA_TSHRSTR: return eqshrstr(tsvalue(t1), tsvalue(t2)); - case LUA_TLNGSTR: return luaS_eqlngstr(tsvalue(t1), tsvalue(t2)); - case LUA_TUSERDATA: { - if (uvalue(t1) == uvalue(t2)) return 1; - else if (L == NULL) return 0; - tm = fasttm(L, uvalue(t1)->metatable, TM_EQ); - if (tm == NULL) - tm = fasttm(L, uvalue(t2)->metatable, TM_EQ); - break; /* will try TM */ - } - case LUA_TTABLE: { - if (hvalue(t1) == hvalue(t2)) return 1; - else if (L == NULL) return 0; - tm = fasttm(L, hvalue(t1)->metatable, TM_EQ); - if (tm == NULL) - tm = fasttm(L, hvalue(t2)->metatable, TM_EQ); - break; /* will try TM */ - } - default: - return gcvalue(t1) == gcvalue(t2); - } - if (tm == NULL) /* no TM? */ - return 0; /* objects are different */ - luaT_callTM(L, tm, t1, t2, L->top, 1); /* call TM */ - return !l_isfalse(L->top); -} - - -/* macro used by 'luaV_concat' to ensure that element at 'o' is a string */ -#define tostring(L,o) \ - (ttisstring(o) || (cvt2str(o) && (luaO_tostring(L, o), 1))) - -#define isemptystr(o) (ttisshrstring(o) && tsvalue(o)->shrlen == 0) - -/* copy strings in stack from top - n up to top - 1 to buffer */ -static void copy2buff (StkId top, int n, char *buff) { - size_t tl = 0; /* size already copied */ - do { - size_t l = vslen(top - n); /* length of string being copied */ - memcpy(buff + tl, svalue(top - n), l * sizeof(char)); - tl += l; - } while (--n > 0); -} - - -/* -** Main operation for concatenation: concat 'total' values in the stack, -** from 'L->top - total' up to 'L->top - 1'. -*/ -void luaV_concat (lua_State *L, int total) { - lua_assert(total >= 2); - do { - StkId top = L->top; - int n = 2; /* number of elements handled in this pass (at least 2) */ - if (!(ttisstring(top-2) || cvt2str(top-2)) || !tostring(L, top-1)) - luaT_trybinTM(L, top-2, top-1, top-2, TM_CONCAT); - else if (isemptystr(top - 1)) /* second operand is empty? */ - cast_void(tostring(L, top - 2)); /* result is first operand */ - else if (isemptystr(top - 2)) { /* first operand is an empty string? */ - setobjs2s(L, top - 2, top - 1); /* result is second op. */ - } - else { - /* at least two non-empty string values; get as many as possible */ - size_t tl = vslen(top - 1); - TString *ts; - /* collect total length and number of strings */ - for (n = 1; n < total && tostring(L, top - n - 1); n++) { - size_t l = vslen(top - n - 1); - if (l >= (MAX_SIZE/sizeof(char)) - tl) - luaG_runerror(L, "string length overflow"); - tl += l; - } - if (tl <= LUAI_MAXSHORTLEN) { /* is result a short string? */ - char buff[LUAI_MAXSHORTLEN]; - copy2buff(top, n, buff); /* copy strings to buffer */ - ts = luaS_newlstr(L, buff, tl); - } - else { /* long string; copy strings directly to final result */ - ts = luaS_createlngstrobj(L, tl); - copy2buff(top, n, getstr(ts)); - } - setsvalue2s(L, top - n, ts); /* create result */ - } - total -= n-1; /* got 'n' strings to create 1 new */ - L->top -= n-1; /* popped 'n' strings and pushed one */ - } while (total > 1); /* repeat until only 1 result left */ -} - - -/* -** Main operation 'ra' = #rb'. -*/ -void luaV_objlen (lua_State *L, StkId ra, const TValue *rb) { - const TValue *tm; - switch (ttype(rb)) { - case LUA_TTABLE: { - Table *h = hvalue(rb); - tm = fasttm(L, h->metatable, TM_LEN); - if (tm) break; /* metamethod? break switch to call it */ - setivalue(ra, luaH_getn(h)); /* else primitive len */ - return; - } - case LUA_TSHRSTR: { - setivalue(ra, tsvalue(rb)->shrlen); - return; - } - case LUA_TLNGSTR: { - setivalue(ra, tsvalue(rb)->u.lnglen); - return; - } - default: { /* try metamethod */ - tm = luaT_gettmbyobj(L, rb, TM_LEN); - if (ttisnil(tm)) /* no metamethod? */ - luaG_typeerror(L, rb, "get length of"); - break; - } - } - luaT_callTM(L, tm, rb, rb, ra, 1); -} - - -/* -** Integer division; return 'm // n', that is, floor(m/n). -** C division truncates its result (rounds towards zero). -** 'floor(q) == trunc(q)' when 'q >= 0' or when 'q' is integer, -** otherwise 'floor(q) == trunc(q) - 1'. -*/ -lua_Integer luaV_div (lua_State *L, lua_Integer m, lua_Integer n) { - if (l_castS2U(n) + 1u <= 1u) { /* special cases: -1 or 0 */ - if (n == 0) - luaG_runerror(L, "attempt to divide by zero"); - return intop(-, 0, m); /* n==-1; avoid overflow with 0x80000...//-1 */ - } - else { - lua_Integer q = m / n; /* perform C division */ - if ((m ^ n) < 0 && m % n != 0) /* 'm/n' would be negative non-integer? */ - q -= 1; /* correct result for different rounding */ - return q; - } -} - - -/* -** Integer modulus; return 'm % n'. (Assume that C '%' with -** negative operands follows C99 behavior. See previous comment -** about luaV_div.) -*/ -lua_Integer luaV_mod (lua_State *L, lua_Integer m, lua_Integer n) { - if (l_castS2U(n) + 1u <= 1u) { /* special cases: -1 or 0 */ - if (n == 0) - luaG_runerror(L, "attempt to perform 'n%%0'"); - return 0; /* m % -1 == 0; avoid overflow with 0x80000...%-1 */ - } - else { - lua_Integer r = m % n; - if (r != 0 && (m ^ n) < 0) /* 'm/n' would be non-integer negative? */ - r += n; /* correct result for different rounding */ - return r; - } -} - - -/* number of bits in an integer */ -#define NBITS cast_int(sizeof(lua_Integer) * CHAR_BIT) - -/* -** Shift left operation. (Shift right just negates 'y'.) -*/ -lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y) { - if (y < 0) { /* shift right? */ - if (y <= -NBITS) return 0; - else return intop(>>, x, -y); - } - else { /* shift left */ - if (y >= NBITS) return 0; - else return intop(<<, x, y); - } -} - - -/* -** check whether cached closure in prototype 'p' may be reused, that is, -** whether there is a cached closure with the same upvalues needed by -** new closure to be created. -*/ -static LClosure *getcached (Proto *p, UpVal **encup, StkId base) { - LClosure *c = p->cache; - if (c != NULL) { /* is there a cached closure? */ - int nup = p->sizeupvalues; - Upvaldesc *uv = p->upvalues; - int i; - for (i = 0; i < nup; i++) { /* check whether it has right upvalues */ - TValue *v = uv[i].instack ? base + uv[i].idx : encup[uv[i].idx]->v; - if (c->upvals[i]->v != v) - return NULL; /* wrong upvalue; cannot reuse closure */ - } - } - return c; /* return cached closure (or NULL if no cached closure) */ -} - - -/* -** create a new Lua closure, push it in the stack, and initialize -** its upvalues. Note that the closure is not cached if prototype is -** already black (which means that 'cache' was already cleared by the -** GC). -*/ -static void pushclosure (lua_State *L, Proto *p, UpVal **encup, StkId base, - StkId ra) { - int nup = p->sizeupvalues; - Upvaldesc *uv = p->upvalues; - int i; - LClosure *ncl = luaF_newLclosure(L, nup); - ncl->p = p; - setclLvalue(L, ra, ncl); /* anchor new closure in stack */ - for (i = 0; i < nup; i++) { /* fill in its upvalues */ - if (uv[i].instack) /* upvalue refers to local variable? */ - ncl->upvals[i] = luaF_findupval(L, base + uv[i].idx); - else /* get upvalue from enclosing function */ - ncl->upvals[i] = encup[uv[i].idx]; - ncl->upvals[i]->refcount++; - /* new closure is white, so we do not need a barrier here */ - } - if (!isblack(p)) /* cache will not break GC invariant? */ - p->cache = ncl; /* save it on cache for reuse */ -} - - -/* -** finish execution of an opcode interrupted by an yield -*/ -void luaV_finishOp (lua_State *L) { - CallInfo *ci = L->ci; - StkId base = ci->u.l.base; - Instruction inst = *(ci->u.l.savedpc - 1); /* interrupted instruction */ - OpCode op = GET_OPCODE(inst); - switch (op) { /* finish its execution */ - case OP_ADD: case OP_SUB: case OP_MUL: case OP_DIV: case OP_IDIV: - case OP_BAND: case OP_BOR: case OP_BXOR: case OP_SHL: case OP_SHR: - case OP_MOD: case OP_POW: - case OP_UNM: case OP_BNOT: case OP_LEN: - case OP_GETTABUP: case OP_GETTABLE: case OP_SELF: { - setobjs2s(L, base + GETARG_A(inst), --L->top); - break; - } - case OP_LE: case OP_LT: case OP_EQ: { - int res = !l_isfalse(L->top - 1); - L->top--; - if (ci->callstatus & CIST_LEQ) { /* "<=" using "<" instead? */ - lua_assert(op == OP_LE); - ci->callstatus ^= CIST_LEQ; /* clear mark */ - res = !res; /* negate result */ - } - lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_JMP); - if (res != GETARG_A(inst)) /* condition failed? */ - ci->u.l.savedpc++; /* skip jump instruction */ - break; - } - case OP_CONCAT: { - StkId top = L->top - 1; /* top when 'luaT_trybinTM' was called */ - int b = GETARG_B(inst); /* first element to concatenate */ - int total = cast_int(top - 1 - (base + b)); /* yet to concatenate */ - setobj2s(L, top - 2, top); /* put TM result in proper position */ - if (total > 1) { /* are there elements to concat? */ - L->top = top - 1; /* top is one after last element (at top-2) */ - luaV_concat(L, total); /* concat them (may yield again) */ - } - /* move final result to final position */ - setobj2s(L, ci->u.l.base + GETARG_A(inst), L->top - 1); - L->top = ci->top; /* restore top */ - break; - } - case OP_TFORCALL: { - lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_TFORLOOP); - L->top = ci->top; /* correct top */ - break; - } - case OP_CALL: { - if (GETARG_C(inst) - 1 >= 0) /* nresults >= 0? */ - L->top = ci->top; /* adjust results */ - break; - } - case OP_TAILCALL: case OP_SETTABUP: case OP_SETTABLE: - break; - default: lua_assert(0); - } -} - - - - -/* -** {================================================================== -** Function 'luaV_execute': main interpreter loop -** =================================================================== -*/ - - -/* -** some macros for common tasks in 'luaV_execute' -*/ - - -#define RA(i) (base+GETARG_A(i)) -#define RB(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgR, base+GETARG_B(i)) -#define RC(i) check_exp(getCMode(GET_OPCODE(i)) == OpArgR, base+GETARG_C(i)) -#define RKB(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgK, \ - ISK(GETARG_B(i)) ? k+INDEXK(GETARG_B(i)) : base+GETARG_B(i)) -#define RKC(i) check_exp(getCMode(GET_OPCODE(i)) == OpArgK, \ - ISK(GETARG_C(i)) ? k+INDEXK(GETARG_C(i)) : base+GETARG_C(i)) - - -/* execute a jump instruction */ -#define dojump(ci,i,e) \ - { int a = GETARG_A(i); \ - if (a != 0) luaF_close(L, ci->u.l.base + a - 1); \ - ci->u.l.savedpc += GETARG_sBx(i) + e; } - -/* for test instructions, execute the jump instruction that follows it */ -#define donextjump(ci) { i = *ci->u.l.savedpc; dojump(ci, i, 1); } - - -#define Protect(x) { {x;}; base = ci->u.l.base; } - -#define checkGC(L,c) \ - { luaC_condGC(L, L->top = (c), /* limit of live values */ \ - Protect(L->top = ci->top)); /* restore top */ \ - luai_threadyield(L); } - - -#define vmdispatch(o) switch(o) -#define vmcase(l) case l: -#define vmbreak break - - -/* -** copy of 'luaV_gettable', but protecting call to potential metamethod -** (which can reallocate the stack) -*/ -#define gettableProtected(L,t,k,v) { const TValue *aux; \ - if (luaV_fastget(L,t,k,aux,luaH_get)) { setobj2s(L, v, aux); } \ - else Protect(luaV_finishget(L,t,k,v,aux)); } - - -/* same for 'luaV_settable' */ -#define settableProtected(L,t,k,v) { const TValue *slot; \ - if (!luaV_fastset(L,t,k,slot,luaH_get,v)) \ - Protect(luaV_finishset(L,t,k,v,slot)); } - - - -void luaV_execute (lua_State *L) { - CallInfo *ci = L->ci; - LClosure *cl; - TValue *k; - StkId base; - ci->callstatus |= CIST_FRESH; /* fresh invocation of 'luaV_execute" */ - newframe: /* reentry point when frame changes (call/return) */ - lua_assert(ci == L->ci); - cl = clLvalue(ci->func); /* local reference to function's closure */ - k = cl->p->k; /* local reference to function's constant table */ - base = ci->u.l.base; /* local copy of function's base */ - /* main loop of interpreter */ - for (;;) { - Instruction i = *(ci->u.l.savedpc++); - StkId ra; - if (L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) - Protect(luaG_traceexec(L)); - /* WARNING: several calls may realloc the stack and invalidate 'ra' */ - ra = RA(i); - lua_assert(base == ci->u.l.base); - lua_assert(base <= L->top && L->top < L->stack + L->stacksize); - vmdispatch (GET_OPCODE(i)) { - vmcase(OP_MOVE) { - setobjs2s(L, ra, RB(i)); - vmbreak; - } - vmcase(OP_LOADK) { - TValue *rb = k + GETARG_Bx(i); - setobj2s(L, ra, rb); - vmbreak; - } - vmcase(OP_LOADKX) { - TValue *rb; - lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_EXTRAARG); - rb = k + GETARG_Ax(*ci->u.l.savedpc++); - setobj2s(L, ra, rb); - vmbreak; - } - vmcase(OP_LOADBOOL) { - setbvalue(ra, GETARG_B(i)); - if (GETARG_C(i)) ci->u.l.savedpc++; /* skip next instruction (if C) */ - vmbreak; - } - vmcase(OP_LOADNIL) { - int b = GETARG_B(i); - do { - setnilvalue(ra++); - } while (b--); - vmbreak; - } - vmcase(OP_GETUPVAL) { - int b = GETARG_B(i); - setobj2s(L, ra, cl->upvals[b]->v); - vmbreak; - } - vmcase(OP_GETTABUP) { - TValue *upval = cl->upvals[GETARG_B(i)]->v; - TValue *rc = RKC(i); - gettableProtected(L, upval, rc, ra); - vmbreak; - } - vmcase(OP_GETTABLE) { - StkId rb = RB(i); - TValue *rc = RKC(i); - gettableProtected(L, rb, rc, ra); - vmbreak; - } - vmcase(OP_SETTABUP) { - TValue *upval = cl->upvals[GETARG_A(i)]->v; - TValue *rb = RKB(i); - TValue *rc = RKC(i); - settableProtected(L, upval, rb, rc); - vmbreak; - } - vmcase(OP_SETUPVAL) { - UpVal *uv = cl->upvals[GETARG_B(i)]; - setobj(L, uv->v, ra); - luaC_upvalbarrier(L, uv); - vmbreak; - } - vmcase(OP_SETTABLE) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - settableProtected(L, ra, rb, rc); - vmbreak; - } - vmcase(OP_NEWTABLE) { - int b = GETARG_B(i); - int c = GETARG_C(i); - Table *t = luaH_new(L); - sethvalue(L, ra, t); - if (b != 0 || c != 0) - luaH_resize(L, t, luaO_fb2int(b), luaO_fb2int(c)); - checkGC(L, ra + 1); - vmbreak; - } - vmcase(OP_SELF) { - const TValue *aux; - StkId rb = RB(i); - TValue *rc = RKC(i); - TString *key = tsvalue(rc); /* key must be a string */ - setobjs2s(L, ra + 1, rb); - if (luaV_fastget(L, rb, key, aux, luaH_getstr)) { - setobj2s(L, ra, aux); - } - else Protect(luaV_finishget(L, rb, rc, ra, aux)); - vmbreak; - } - vmcase(OP_ADD) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Number nb; lua_Number nc; - if (ttisinteger(rb) && ttisinteger(rc)) { - lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc); - setivalue(ra, intop(+, ib, ic)); - } - else if (tonumber(rb, &nb) && tonumber(rc, &nc)) { - setfltvalue(ra, luai_numadd(L, nb, nc)); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_ADD)); } - vmbreak; - } - vmcase(OP_SUB) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Number nb; lua_Number nc; - if (ttisinteger(rb) && ttisinteger(rc)) { - lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc); - setivalue(ra, intop(-, ib, ic)); - } - else if (tonumber(rb, &nb) && tonumber(rc, &nc)) { - setfltvalue(ra, luai_numsub(L, nb, nc)); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_SUB)); } - vmbreak; - } - vmcase(OP_MUL) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Number nb; lua_Number nc; - if (ttisinteger(rb) && ttisinteger(rc)) { - lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc); - setivalue(ra, intop(*, ib, ic)); - } - else if (tonumber(rb, &nb) && tonumber(rc, &nc)) { - setfltvalue(ra, luai_nummul(L, nb, nc)); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_MUL)); } - vmbreak; - } - vmcase(OP_DIV) { /* float division (always with floats) */ - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Number nb; lua_Number nc; - if (tonumber(rb, &nb) && tonumber(rc, &nc)) { - setfltvalue(ra, luai_numdiv(L, nb, nc)); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_DIV)); } - vmbreak; - } - vmcase(OP_BAND) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Integer ib; lua_Integer ic; - if (tointeger(rb, &ib) && tointeger(rc, &ic)) { - setivalue(ra, intop(&, ib, ic)); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_BAND)); } - vmbreak; - } - vmcase(OP_BOR) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Integer ib; lua_Integer ic; - if (tointeger(rb, &ib) && tointeger(rc, &ic)) { - setivalue(ra, intop(|, ib, ic)); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_BOR)); } - vmbreak; - } - vmcase(OP_BXOR) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Integer ib; lua_Integer ic; - if (tointeger(rb, &ib) && tointeger(rc, &ic)) { - setivalue(ra, intop(^, ib, ic)); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_BXOR)); } - vmbreak; - } - vmcase(OP_SHL) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Integer ib; lua_Integer ic; - if (tointeger(rb, &ib) && tointeger(rc, &ic)) { - setivalue(ra, luaV_shiftl(ib, ic)); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_SHL)); } - vmbreak; - } - vmcase(OP_SHR) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Integer ib; lua_Integer ic; - if (tointeger(rb, &ib) && tointeger(rc, &ic)) { - setivalue(ra, luaV_shiftl(ib, -ic)); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_SHR)); } - vmbreak; - } - vmcase(OP_MOD) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Number nb; lua_Number nc; - if (ttisinteger(rb) && ttisinteger(rc)) { - lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc); - setivalue(ra, luaV_mod(L, ib, ic)); - } - else if (tonumber(rb, &nb) && tonumber(rc, &nc)) { - lua_Number m; - luai_nummod(L, nb, nc, m); - setfltvalue(ra, m); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_MOD)); } - vmbreak; - } - vmcase(OP_IDIV) { /* floor division */ - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Number nb; lua_Number nc; - if (ttisinteger(rb) && ttisinteger(rc)) { - lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc); - setivalue(ra, luaV_div(L, ib, ic)); - } - else if (tonumber(rb, &nb) && tonumber(rc, &nc)) { - setfltvalue(ra, luai_numidiv(L, nb, nc)); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_IDIV)); } - vmbreak; - } - vmcase(OP_POW) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - lua_Number nb; lua_Number nc; - if (tonumber(rb, &nb) && tonumber(rc, &nc)) { - setfltvalue(ra, luai_numpow(L, nb, nc)); - } - else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_POW)); } - vmbreak; - } - vmcase(OP_UNM) { - TValue *rb = RB(i); - lua_Number nb; - if (ttisinteger(rb)) { - lua_Integer ib = ivalue(rb); - setivalue(ra, intop(-, 0, ib)); - } - else if (tonumber(rb, &nb)) { - setfltvalue(ra, luai_numunm(L, nb)); - } - else { - Protect(luaT_trybinTM(L, rb, rb, ra, TM_UNM)); - } - vmbreak; - } - vmcase(OP_BNOT) { - TValue *rb = RB(i); - lua_Integer ib; - if (tointeger(rb, &ib)) { - setivalue(ra, intop(^, ~l_castS2U(0), ib)); - } - else { - Protect(luaT_trybinTM(L, rb, rb, ra, TM_BNOT)); - } - vmbreak; - } - vmcase(OP_NOT) { - TValue *rb = RB(i); - int res = l_isfalse(rb); /* next assignment may change this value */ - setbvalue(ra, res); - vmbreak; - } - vmcase(OP_LEN) { - Protect(luaV_objlen(L, ra, RB(i))); - vmbreak; - } - vmcase(OP_CONCAT) { - int b = GETARG_B(i); - int c = GETARG_C(i); - StkId rb; - L->top = base + c + 1; /* mark the end of concat operands */ - Protect(luaV_concat(L, c - b + 1)); - ra = RA(i); /* 'luaV_concat' may invoke TMs and move the stack */ - rb = base + b; - setobjs2s(L, ra, rb); - checkGC(L, (ra >= rb ? ra + 1 : rb)); - L->top = ci->top; /* restore top */ - vmbreak; - } - vmcase(OP_JMP) { - dojump(ci, i, 0); - vmbreak; - } - vmcase(OP_EQ) { - TValue *rb = RKB(i); - TValue *rc = RKC(i); - Protect( - if (luaV_equalobj(L, rb, rc) != GETARG_A(i)) - ci->u.l.savedpc++; - else - donextjump(ci); - ) - vmbreak; - } - vmcase(OP_LT) { - Protect( - if (luaV_lessthan(L, RKB(i), RKC(i)) != GETARG_A(i)) - ci->u.l.savedpc++; - else - donextjump(ci); - ) - vmbreak; - } - vmcase(OP_LE) { - Protect( - if (luaV_lessequal(L, RKB(i), RKC(i)) != GETARG_A(i)) - ci->u.l.savedpc++; - else - donextjump(ci); - ) - vmbreak; - } - vmcase(OP_TEST) { - if (GETARG_C(i) ? l_isfalse(ra) : !l_isfalse(ra)) - ci->u.l.savedpc++; - else - donextjump(ci); - vmbreak; - } - vmcase(OP_TESTSET) { - TValue *rb = RB(i); - if (GETARG_C(i) ? l_isfalse(rb) : !l_isfalse(rb)) - ci->u.l.savedpc++; - else { - setobjs2s(L, ra, rb); - donextjump(ci); - } - vmbreak; - } - vmcase(OP_CALL) { - int b = GETARG_B(i); - int nresults = GETARG_C(i) - 1; - if (b != 0) L->top = ra+b; /* else previous instruction set top */ - if (luaD_precall(L, ra, nresults)) { /* C function? */ - if (nresults >= 0) - L->top = ci->top; /* adjust results */ - Protect((void)0); /* update 'base' */ - } - else { /* Lua function */ - ci = L->ci; - goto newframe; /* restart luaV_execute over new Lua function */ - } - vmbreak; - } - vmcase(OP_TAILCALL) { - int b = GETARG_B(i); - if (b != 0) L->top = ra+b; /* else previous instruction set top */ - lua_assert(GETARG_C(i) - 1 == LUA_MULTRET); - if (luaD_precall(L, ra, LUA_MULTRET)) { /* C function? */ - Protect((void)0); /* update 'base' */ - } - else { - /* tail call: put called frame (n) in place of caller one (o) */ - CallInfo *nci = L->ci; /* called frame */ - CallInfo *oci = nci->previous; /* caller frame */ - StkId nfunc = nci->func; /* called function */ - StkId ofunc = oci->func; /* caller function */ - /* last stack slot filled by 'precall' */ - StkId lim = nci->u.l.base + getproto(nfunc)->numparams; - int aux; - /* close all upvalues from previous call */ - if (cl->p->sizep > 0) luaF_close(L, oci->u.l.base); - /* move new frame into old one */ - for (aux = 0; nfunc + aux < lim; aux++) - setobjs2s(L, ofunc + aux, nfunc + aux); - oci->u.l.base = ofunc + (nci->u.l.base - nfunc); /* correct base */ - oci->top = L->top = ofunc + (L->top - nfunc); /* correct top */ - oci->u.l.savedpc = nci->u.l.savedpc; - oci->callstatus |= CIST_TAIL; /* function was tail called */ - ci = L->ci = oci; /* remove new frame */ - lua_assert(L->top == oci->u.l.base + getproto(ofunc)->maxstacksize); - goto newframe; /* restart luaV_execute over new Lua function */ - } - vmbreak; - } - vmcase(OP_RETURN) { - int b = GETARG_B(i); - if (cl->p->sizep > 0) luaF_close(L, base); - b = luaD_poscall(L, ci, ra, (b != 0 ? b - 1 : cast_int(L->top - ra))); - if (ci->callstatus & CIST_FRESH) /* local 'ci' still from callee */ - return; /* external invocation: return */ - else { /* invocation via reentry: continue execution */ - ci = L->ci; - if (b) L->top = ci->top; - lua_assert(isLua(ci)); - lua_assert(GET_OPCODE(*((ci)->u.l.savedpc - 1)) == OP_CALL); - goto newframe; /* restart luaV_execute over new Lua function */ - } - } - vmcase(OP_FORLOOP) { - if (ttisinteger(ra)) { /* integer loop? */ - lua_Integer step = ivalue(ra + 2); - lua_Integer idx = intop(+, ivalue(ra), step); /* increment index */ - lua_Integer limit = ivalue(ra + 1); - if ((0 < step) ? (idx <= limit) : (limit <= idx)) { - ci->u.l.savedpc += GETARG_sBx(i); /* jump back */ - chgivalue(ra, idx); /* update internal index... */ - setivalue(ra + 3, idx); /* ...and external index */ - } - } - else { /* floating loop */ - lua_Number step = fltvalue(ra + 2); - lua_Number idx = luai_numadd(L, fltvalue(ra), step); /* inc. index */ - lua_Number limit = fltvalue(ra + 1); - if (luai_numlt(0, step) ? luai_numle(idx, limit) - : luai_numle(limit, idx)) { - ci->u.l.savedpc += GETARG_sBx(i); /* jump back */ - chgfltvalue(ra, idx); /* update internal index... */ - setfltvalue(ra + 3, idx); /* ...and external index */ - } - } - vmbreak; - } - vmcase(OP_FORPREP) { - TValue *init = ra; - TValue *plimit = ra + 1; - TValue *pstep = ra + 2; - lua_Integer ilimit; - int stopnow; - if (ttisinteger(init) && ttisinteger(pstep) && - forlimit(plimit, &ilimit, ivalue(pstep), &stopnow)) { - /* all values are integer */ - lua_Integer initv = (stopnow ? 0 : ivalue(init)); - setivalue(plimit, ilimit); - setivalue(init, intop(-, initv, ivalue(pstep))); - } - else { /* try making all values floats */ - lua_Number ninit; lua_Number nlimit; lua_Number nstep; - if (!tonumber(plimit, &nlimit)) - luaG_runerror(L, "'for' limit must be a number"); - setfltvalue(plimit, nlimit); - if (!tonumber(pstep, &nstep)) - luaG_runerror(L, "'for' step must be a number"); - setfltvalue(pstep, nstep); - if (!tonumber(init, &ninit)) - luaG_runerror(L, "'for' initial value must be a number"); - setfltvalue(init, luai_numsub(L, ninit, nstep)); - } - ci->u.l.savedpc += GETARG_sBx(i); - vmbreak; - } - vmcase(OP_TFORCALL) { - StkId cb = ra + 3; /* call base */ - setobjs2s(L, cb+2, ra+2); - setobjs2s(L, cb+1, ra+1); - setobjs2s(L, cb, ra); - L->top = cb + 3; /* func. + 2 args (state and index) */ - Protect(luaD_call(L, cb, GETARG_C(i))); - L->top = ci->top; - i = *(ci->u.l.savedpc++); /* go to next instruction */ - ra = RA(i); - lua_assert(GET_OPCODE(i) == OP_TFORLOOP); - goto l_tforloop; - } - vmcase(OP_TFORLOOP) { - l_tforloop: - if (!ttisnil(ra + 1)) { /* continue loop? */ - setobjs2s(L, ra, ra + 1); /* save control variable */ - ci->u.l.savedpc += GETARG_sBx(i); /* jump back */ - } - vmbreak; - } - vmcase(OP_SETLIST) { - int n = GETARG_B(i); - int c = GETARG_C(i); - unsigned int last; - Table *h; - if (n == 0) n = cast_int(L->top - ra) - 1; - if (c == 0) { - lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_EXTRAARG); - c = GETARG_Ax(*ci->u.l.savedpc++); - } - h = hvalue(ra); - last = ((c-1)*LFIELDS_PER_FLUSH) + n; - if (last > h->sizearray) /* needs more space? */ - luaH_resizearray(L, h, last); /* preallocate it at once */ - for (; n > 0; n--) { - TValue *val = ra+n; - luaH_setint(L, h, last--, val); - luaC_barrierback(L, h, val); - } - L->top = ci->top; /* correct top (in case of previous open call) */ - vmbreak; - } - vmcase(OP_CLOSURE) { - Proto *p = cl->p->p[GETARG_Bx(i)]; - LClosure *ncl = getcached(p, cl->upvals, base); /* cached closure */ - if (ncl == NULL) /* no match? */ - pushclosure(L, p, cl->upvals, base, ra); /* create a new one */ - else - setclLvalue(L, ra, ncl); /* push cashed closure */ - checkGC(L, ra + 1); - vmbreak; - } - vmcase(OP_VARARG) { - int b = GETARG_B(i) - 1; /* required results */ - int j; - int n = cast_int(base - ci->func) - cl->p->numparams - 1; - if (n < 0) /* less arguments than parameters? */ - n = 0; /* no vararg arguments */ - if (b < 0) { /* B == 0? */ - b = n; /* get all var. arguments */ - Protect(luaD_checkstack(L, n)); - ra = RA(i); /* previous call may change the stack */ - L->top = ra + n; - } - for (j = 0; j < b && j < n; j++) - setobjs2s(L, ra + j, base - n + j); - for (; j < b; j++) /* complete required results with nil */ - setnilvalue(ra + j); - vmbreak; - } - vmcase(OP_EXTRAARG) { - lua_assert(0); - vmbreak; - } - } - } -} - -/* }================================================================== */ - |