diff options
Diffstat (limited to 'libs/liblua/src/lvm.c')
| -rw-r--r-- | libs/liblua/src/lvm.c | 510 |
1 files changed, 325 insertions, 185 deletions
diff --git a/libs/liblua/src/lvm.c b/libs/liblua/src/lvm.c index 2ac1b02df4..84ade6b2fa 100644 --- a/libs/liblua/src/lvm.c +++ b/libs/liblua/src/lvm.c @@ -1,5 +1,5 @@ /* -** $Id: lvm.c,v 2.232 2014/12/27 20:30:38 roberto Exp $ +** $Id: lvm.c,v 2.268 2016/02/05 19:59:14 roberto Exp $ ** Lua virtual machine ** See Copyright Notice in lua.h */ @@ -9,8 +9,9 @@ #include "lprefix.h" - +#include <float.h> #include <limits.h> +#include <math.h> #include <stdio.h> #include <stdlib.h> #include <string.h> @@ -30,36 +31,38 @@ #include "lvm.h" -/* -** You can define LUA_FLOORN2I if you want to convert floats to integers -** by flooring them (instead of raising an error if they are not -** integral values) -*/ -#if !defined(LUA_FLOORN2I) -#define LUA_FLOORN2I 0 -#endif - - /* limit for table tag-method chains (to avoid loops) */ #define MAXTAGLOOP 2000 + /* -** Similar to 'tonumber', but does not attempt to convert strings and -** ensure correct precision (no extra bits). Used in comparisons. +** '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. */ -static int tofloat (const TValue *obj, lua_Number *n) { - if (ttisfloat(obj)) *n = fltvalue(obj); - else if (ttisinteger(obj)) { - volatile lua_Number x = cast_num(ivalue(obj)); /* avoid extra precision */ - *n = x; - } - else { - *n = 0; /* to avoid warnings */ - return 0; - } - return 1; -} +#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 + /* @@ -73,7 +76,7 @@ int luaV_tonumber_ (const TValue *obj, lua_Number *n) { return 1; } else if (cvt2num(obj) && /* string convertible to number? */ - luaO_str2num(svalue(obj), &v) == tsvalue(obj)->len + 1) { + luaO_str2num(svalue(obj), &v) == vslen(obj) + 1) { *n = nvalue(&v); /* convert result of 'luaO_str2num' to a float */ return 1; } @@ -88,7 +91,7 @@ int luaV_tonumber_ (const TValue *obj, lua_Number *n) { ** mode == 1: takes the floor of the number ** mode == 2: takes the ceil of the number */ -static int tointeger_aux (const TValue *obj, lua_Integer *p, int mode) { +int luaV_tointeger (const TValue *obj, lua_Integer *p, int mode) { TValue v; again: if (ttisfloat(obj)) { @@ -106,7 +109,7 @@ static int tointeger_aux (const TValue *obj, lua_Integer *p, int mode) { return 1; } else if (cvt2num(obj) && - luaO_str2num(svalue(obj), &v) == tsvalue(obj)->len + 1) { + luaO_str2num(svalue(obj), &v) == vslen(obj) + 1) { obj = &v; goto again; /* convert result from 'luaO_str2num' to an integer */ } @@ -115,14 +118,6 @@ static int tointeger_aux (const TValue *obj, lua_Integer *p, int mode) { /* -** try to convert a value to an integer -*/ -int luaV_tointeger_ (const TValue *obj, lua_Integer *p) { - return tointeger_aux(obj, p, LUA_FLOORN2I); -} - - -/* ** 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 @@ -140,11 +135,11 @@ int luaV_tointeger_ (const TValue *obj, lua_Integer *p) { static int forlimit (const TValue *obj, lua_Integer *p, lua_Integer step, int *stopnow) { *stopnow = 0; /* usually, let loops run */ - if (!tointeger_aux(obj, p, (step < 0 ? 2 : 1))) { /* not fit in integer? */ + 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 (n > 0) { /* if true, float is larger than max integer */ + if (luai_numlt(0, n)) { /* if true, float is larger than max integer */ *p = LUA_MAXINTEGER; if (step < 0) *stopnow = 1; } @@ -158,75 +153,88 @@ static int forlimit (const TValue *obj, lua_Integer *p, lua_Integer step, /* -** Main function for table access (invoking metamethods if needed). -** Compute 'val = t[key]' +** Finish the table access 'val = t[key]'. +** if 'slot' is NULL, 't' is not a table; otherwise, 'slot' points to +** t[k] entry (which must be nil). */ -void luaV_gettable (lua_State *L, const TValue *t, TValue *key, StkId val) { +void luaV_finishget (lua_State *L, const TValue *t, TValue *key, StkId val, + const TValue *slot) { int loop; /* counter to avoid infinite loops */ + const TValue *tm; /* metamethod */ for (loop = 0; loop < MAXTAGLOOP; loop++) { - const TValue *tm; - if (ttistable(t)) { /* 't' is a table? */ - Table *h = hvalue(t); - const TValue *res = luaH_get(h, key); /* do a primitive get */ - if (!ttisnil(res) || /* result is not nil? */ - (tm = fasttm(L, h->metatable, TM_INDEX)) == NULL) { /* or no TM? */ - setobj2s(L, val, res); /* result is the raw get */ + if (slot == NULL) { /* 't' is not a table? */ + lua_assert(!ttistable(t)); + tm = luaT_gettmbyobj(L, t, TM_INDEX); + if (ttisnil(tm)) + luaG_typeerror(L, t, "index"); /* no metamethod */ + /* else will try the metamethod */ + } + else { /* 't' is a table */ + lua_assert(ttisnil(slot)); + tm = fasttm(L, hvalue(t)->metatable, TM_INDEX); /* table's metamethod */ + if (tm == NULL) { /* no metamethod? */ + setnilvalue(val); /* result is nil */ return; } - /* else will try metamethod */ + /* else will try the metamethod */ + } + if (ttisfunction(tm)) { /* is metamethod a function? */ + luaT_callTM(L, tm, t, key, val, 1); /* call it */ + return; } - else 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); + t = tm; /* else try to access 'tm[key]' */ + if (luaV_fastget(L,t,key,slot,luaH_get)) { /* fast track? */ + setobj2s(L, val, slot); /* done */ return; } - t = tm; /* else repeat access over 'tm' */ + /* else repeat (tail call 'luaV_finishget') */ } - luaG_runerror(L, "gettable chain too long; possible loop"); + luaG_runerror(L, "'__index' chain too long; possible loop"); } /* -** Main function for table assignment (invoking metamethods if needed). -** Compute 't[key] = val' +** Finish a table assignment 't[key] = val'. +** If 'slot' is NULL, 't' is not a table. Otherwise, 'slot' points +** to the entry 't[key]', or to 'luaO_nilobject' if there is no such +** entry. (The value at 'slot' must be nil, otherwise 'luaV_fastset' +** would have done the job.) */ -void luaV_settable (lua_State *L, const TValue *t, TValue *key, StkId val) { +void luaV_finishset (lua_State *L, const TValue *t, TValue *key, + StkId val, const TValue *slot) { int loop; /* counter to avoid infinite loops */ for (loop = 0; loop < MAXTAGLOOP; loop++) { - const TValue *tm; - if (ttistable(t)) { /* 't' is a table? */ - Table *h = hvalue(t); - TValue *oldval = cast(TValue *, luaH_get(h, key)); - /* if previous value is not nil, there must be a previous entry - in the table; a metamethod has no relevance */ - if (!ttisnil(oldval) || - /* previous value is nil; must check the metamethod */ - ((tm = fasttm(L, h->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, h, key), 1)))) { + const TValue *tm; /* '__newindex' metamethod */ + if (slot != NULL) { /* is 't' a table? */ + Table *h = hvalue(t); /* save 't' table */ + lua_assert(ttisnil(slot)); /* old value must be nil */ + tm = fasttm(L, h->metatable, TM_NEWINDEX); /* get metamethod */ + if (tm == NULL) { /* no metamethod? */ + if (slot == luaO_nilobject) /* no previous entry? */ + slot = luaH_newkey(L, h, key); /* create one */ /* no metamethod and (now) there is an entry with given key */ - setobj2t(L, oldval, val); /* assign new value to that entry */ + setobj2t(L, cast(TValue *, slot), val); /* set its new value */ invalidateTMcache(h); luaC_barrierback(L, h, val); return; } /* else will try the metamethod */ } - else /* not a table; check 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, slot, luaH_get, val)) + return; /* done */ + /* else loop */ } - luaG_runerror(L, "settable chain too long; possible loop"); + luaG_runerror(L, "'__newindex' chain too long; possible loop"); } @@ -239,9 +247,9 @@ void luaV_settable (lua_State *L, const TValue *t, TValue *key, StkId val) { */ static int l_strcmp (const TString *ls, const TString *rs) { const char *l = getstr(ls); - size_t ll = ls->len; + size_t ll = tsslen(ls); const char *r = getstr(rs); - size_t lr = rs->len; + size_t lr = tsslen(rs); for (;;) { /* for each segment */ int temp = strcoll(l, r); if (temp != 0) /* not equal? */ @@ -261,15 +269,102 @@ static int l_strcmp (const TString *ls, const TString *rs) { /* +** 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; - lua_Number nl, nr; - if (ttisinteger(l) && ttisinteger(r)) /* both operands are integers? */ - return (ivalue(l) < ivalue(r)); - else if (tofloat(l, &nl) && tofloat(r, &nr)) /* both are numbers? */ - return luai_numlt(nl, nr); + 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? */ @@ -279,27 +374,34 @@ int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) { /* -** Main operation less than or equal to; return 'l <= r'. +** 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; - lua_Number nl, nr; - if (ttisinteger(l) && ttisinteger(r)) /* both operands are integers? */ - return (ivalue(l) <= ivalue(r)); - else if (tofloat(l, &nl) && tofloat(r, &nr)) /* both are numbers? */ - return luai_numle(nl, nr); + 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) /* first try 'le' */ + else if ((res = luaT_callorderTM(L, l, r, TM_LE)) >= 0) /* try 'le' */ return res; - else if ((res = luaT_callorderTM(L, r, l, TM_LT)) < 0) /* else try 'lt' */ - luaG_ordererror(L, l, r); - 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'. +** 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) { @@ -308,10 +410,8 @@ int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2) { 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_Number n1, n2; /* compare them as floats */ - lua_assert(ttisnumber(t1) && ttisnumber(t2)); - cast_void(tofloat(t1, &n1)); cast_void(tofloat(t2, &n2)); - return luai_numeq(n1, n2); + lua_Integer i1, i2; /* compare them as integers */ + return (tointeger(t1, &i1) && tointeger(t2, &i2) && i1 == i2); } } /* values have same type and same variant */ @@ -354,6 +454,19 @@ int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2) { #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'. @@ -365,32 +478,32 @@ void luaV_concat (lua_State *L, int total) { 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 (tsvalue(top-1)->len == 0) /* second operand is empty? */ + else if (isemptystr(top - 1)) /* second operand is empty? */ cast_void(tostring(L, top - 2)); /* result is first operand */ - else if (ttisstring(top-2) && tsvalue(top-2)->len == 0) { + 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 = tsvalue(top-1)->len; - char *buffer; - int i; - /* collect total length */ - for (i = 1; i < total && tostring(L, top-i-1); i++) { - size_t l = tsvalue(top-i-1)->len; + 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; } - buffer = luaZ_openspace(L, &G(L)->buff, tl); - tl = 0; - n = i; - do { /* copy all strings to buffer */ - size_t l = tsvalue(top-i)->len; - memcpy(buffer+tl, svalue(top-i), l * sizeof(char)); - tl += l; - } while (--i > 0); - setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl)); /* create result */ + 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 */ @@ -403,7 +516,7 @@ void luaV_concat (lua_State *L, int total) { */ void luaV_objlen (lua_State *L, StkId ra, const TValue *rb) { const TValue *tm; - switch (ttnov(rb)) { + switch (ttype(rb)) { case LUA_TTABLE: { Table *h = hvalue(rb); tm = fasttm(L, h->metatable, TM_LEN); @@ -411,8 +524,12 @@ void luaV_objlen (lua_State *L, StkId ra, const TValue *rb) { setivalue(ra, luaH_getn(h)); /* else primitive len */ return; } - case LUA_TSTRING: { - setivalue(ra, tsvalue(rb)->len); + case LUA_TSHRSTR: { + setivalue(ra, tsvalue(rb)->shrlen); + return; + } + case LUA_TLNGSTR: { + setivalue(ra, tsvalue(rb)->u.lnglen); return; } default: { /* try metamethod */ @@ -448,7 +565,7 @@ lua_Integer luaV_div (lua_State *L, lua_Integer m, lua_Integer n) { /* -** Integer modulus; return 'm % n'. (Assume that C '%' with +** Integer modulus; return 'm % n'. (Assume that C '%' with ** negative operands follows C99 behavior. See previous comment ** about luaV_div.) */ @@ -553,11 +670,11 @@ void luaV_finishOp (lua_State *L) { case OP_LE: case OP_LT: case OP_EQ: { int res = !l_isfalse(L->top - 1); L->top--; - /* metamethod should not be called when operand is K */ - lua_assert(!ISK(GETARG_B(inst))); - if (op == OP_LE && /* "<=" using "<" instead? */ - ttisnil(luaT_gettmbyobj(L, base + GETARG_B(inst), TM_LE))) - res = !res; /* invert result */ + 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 */ @@ -607,27 +724,20 @@ void luaV_finishOp (lua_State *L) { ** some macros for common tasks in 'luaV_execute' */ -#if !defined luai_runtimecheck -#define luai_runtimecheck(L, c) /* void */ -#endif - #define RA(i) (base+GETARG_A(i)) -/* to be used after possible stack reallocation */ #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)) -#define KBx(i) \ - (k + (GETARG_Bx(i) != 0 ? GETARG_Bx(i) - 1 : GETARG_Ax(*ci->u.l.savedpc++))) /* 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); \ + 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 */ @@ -637,38 +747,58 @@ void luaV_finishOp (lua_State *L) { #define Protect(x) { {x;}; base = ci->u.l.base; } #define checkGC(L,c) \ - Protect( luaC_condGC(L,{L->top = (c); /* limit of live values */ \ - luaC_step(L); \ - L->top = ci->top;}) /* restore top */ \ - luai_threadyield(L); ) - + { luaC_condGC(L, L->top = (c), /* limit of live values */ \ + Protect(L->top = ci->top)); /* restore top */ \ + luai_threadyield(L); } + + +/* fetch an instruction and prepare its execution */ +#define vmfetch() { \ + i = *(ci->u.l.savedpc++); \ + if (L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) \ + Protect(luaG_traceexec(L)); \ + ra = RA(i); /* WARNING: any stack reallocation invalidates 'ra' */ \ + lua_assert(base == ci->u.l.base); \ + lua_assert(base <= L->top && L->top < L->stack + L->stacksize); \ +} #define vmdispatch(o) switch(o) #define vmcase(l) case l: #define vmbreak break + +/* +** copy of 'luaV_gettable', but protecting the call to potential +** metamethod (which can reallocate the stack) +*/ +#define gettableProtected(L,t,k,v) { const TValue *slot; \ + if (luaV_fastget(L,t,k,slot,luaH_get)) { setobj2s(L, v, slot); } \ + else Protect(luaV_finishget(L,t,k,v,slot)); } + + +/* 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); - k = cl->p->k; - base = ci->u.l.base; + 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++); + Instruction i; StkId ra; - if ((L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) && - (--L->hookcount == 0 || L->hookmask & LUA_MASKLINE)) { - 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); + vmfetch(); vmdispatch (GET_OPCODE(i)) { vmcase(OP_MOVE) { setobjs2s(L, ra, RB(i)); @@ -704,17 +834,22 @@ void luaV_execute (lua_State *L) { vmbreak; } vmcase(OP_GETTABUP) { - int b = GETARG_B(i); - Protect(luaV_gettable(L, cl->upvals[b]->v, RKC(i), ra)); + TValue *upval = cl->upvals[GETARG_B(i)]->v; + TValue *rc = RKC(i); + gettableProtected(L, upval, rc, ra); vmbreak; } vmcase(OP_GETTABLE) { - Protect(luaV_gettable(L, RB(i), RKC(i), ra)); + StkId rb = RB(i); + TValue *rc = RKC(i); + gettableProtected(L, rb, rc, ra); vmbreak; } vmcase(OP_SETTABUP) { - int a = GETARG_A(i); - Protect(luaV_settable(L, cl->upvals[a]->v, RKB(i), RKC(i))); + 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) { @@ -724,7 +859,9 @@ void luaV_execute (lua_State *L) { vmbreak; } vmcase(OP_SETTABLE) { - Protect(luaV_settable(L, ra, RKB(i), RKC(i))); + TValue *rb = RKB(i); + TValue *rc = RKC(i); + settableProtected(L, ra, rb, rc); vmbreak; } vmcase(OP_NEWTABLE) { @@ -738,12 +875,18 @@ void luaV_execute (lua_State *L) { vmbreak; } vmcase(OP_SELF) { + const TValue *aux; StkId rb = RB(i); - setobjs2s(L, ra+1, rb); - Protect(luaV_gettable(L, rb, RKC(i), ra)); + 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) { + vmcase(OP_ADD) { TValue *rb = RKB(i); TValue *rc = RKC(i); lua_Number nb; lua_Number nc; @@ -927,8 +1070,8 @@ void luaV_execute (lua_State *L) { 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 = b + base; + 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 */ @@ -942,7 +1085,7 @@ void luaV_execute (lua_State *L) { TValue *rb = RKB(i); TValue *rc = RKC(i); Protect( - if (cast_int(luaV_equalobj(L, rb, rc)) != GETARG_A(i)) + if (luaV_equalobj(L, rb, rc) != GETARG_A(i)) ci->u.l.savedpc++; else donextjump(ci); @@ -989,12 +1132,12 @@ void luaV_execute (lua_State *L) { 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 */ - base = ci->u.l.base; + if (nresults >= 0) + L->top = ci->top; /* adjust results */ + Protect((void)0); /* update 'base' */ } else { /* Lua function */ ci = L->ci; - ci->callstatus |= CIST_REENTRY; goto newframe; /* restart luaV_execute over new Lua function */ } vmbreak; @@ -1003,8 +1146,9 @@ void luaV_execute (lua_State *L) { 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? */ - base = ci->u.l.base; + 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 */ @@ -1031,10 +1175,9 @@ void luaV_execute (lua_State *L) { } vmcase(OP_RETURN) { int b = GETARG_B(i); - if (b != 0) L->top = ra+b-1; if (cl->p->sizep > 0) luaF_close(L, base); - b = luaD_poscall(L, ra); - if (!(ci->callstatus & CIST_REENTRY)) /* 'ci' still the called one */ + 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; @@ -1047,11 +1190,11 @@ void luaV_execute (lua_State *L) { vmcase(OP_FORLOOP) { if (ttisinteger(ra)) { /* integer loop? */ lua_Integer step = ivalue(ra + 2); - lua_Integer idx = ivalue(ra) + step; /* increment index */ + 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 */ - setivalue(ra, idx); /* update internal index... */ + chgivalue(ra, idx); /* update internal index... */ setivalue(ra + 3, idx); /* ...and external index */ } } @@ -1062,7 +1205,7 @@ void luaV_execute (lua_State *L) { if (luai_numlt(0, step) ? luai_numle(idx, limit) : luai_numle(limit, idx)) { ci->u.l.savedpc += GETARG_sBx(i); /* jump back */ - setfltvalue(ra, idx); /* update internal index... */ + chgfltvalue(ra, idx); /* update internal index... */ setfltvalue(ra + 3, idx); /* ...and external index */ } } @@ -1079,7 +1222,7 @@ void luaV_execute (lua_State *L) { /* all values are integer */ lua_Integer initv = (stopnow ? 0 : ivalue(init)); setivalue(plimit, ilimit); - setivalue(init, initv - ivalue(pstep)); + setivalue(init, intop(-, initv, ivalue(pstep))); } else { /* try making all values floats */ lua_Number ninit; lua_Number nlimit; lua_Number nstep; @@ -1102,7 +1245,7 @@ void luaV_execute (lua_State *L) { 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), 1)); + Protect(luaD_call(L, cb, GETARG_C(i))); L->top = ci->top; i = *(ci->u.l.savedpc++); /* go to next instruction */ ra = RA(i); @@ -1127,11 +1270,10 @@ void luaV_execute (lua_State *L) { lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_EXTRAARG); c = GETARG_Ax(*ci->u.l.savedpc++); } - luai_runtimecheck(L, ttistable(ra)); h = hvalue(ra); last = ((c-1)*LFIELDS_PER_FLUSH) + n; if (last > h->sizearray) /* needs more space? */ - luaH_resizearray(L, h, last); /* pre-allocate it at once */ + luaH_resizearray(L, h, last); /* preallocate it at once */ for (; n > 0; n--) { TValue *val = ra+n; luaH_setint(L, h, last--, val); @@ -1151,23 +1293,21 @@ void luaV_execute (lua_State *L) { vmbreak; } vmcase(OP_VARARG) { - int b = GETARG_B(i) - 1; + 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++) { - if (j < n) { - setobjs2s(L, ra + j, base - n + j); - } - else { - setnilvalue(ra + j); - } - } + 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) { |