493 lines
15 KiB
C++
493 lines
15 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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// This code is based on Lua 5.x implementation licensed under MIT License; see lua_LICENSE.txt for details
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#include "lvm.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 "lgc.h"
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#include "ldo.h"
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#include "lnumutils.h"
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#include <string.h>
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/* limit for table tag-method chains (to avoid loops) */
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#define MAXTAGLOOP 100
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const TValue* luaV_tonumber(const TValue* obj, TValue* n)
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{
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double num;
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if (ttisnumber(obj))
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return obj;
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if (ttisstring(obj) && luaO_str2d(svalue(obj), &num))
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{
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setnvalue(n, num);
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return n;
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}
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else
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return NULL;
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}
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int luaV_tostring(lua_State* L, StkId obj)
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{
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if (!ttisnumber(obj))
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return 0;
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else
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{
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char s[LUAI_MAXNUMBER2STR];
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double n = nvalue(obj);
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luai_num2str(s, n);
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setsvalue2s(L, obj, luaS_new(L, s));
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return 1;
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}
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}
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const float* luaV_tovector(const TValue* obj)
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{
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if (ttisvector(obj))
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return obj->value.v;
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return nullptr;
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}
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static void callTMres(lua_State* L, StkId res, const TValue* f, const TValue* p1, const TValue* p2)
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{
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ptrdiff_t result = savestack(L, res);
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// RBOLOX: using stack room beyond top is technically safe here, but for very complicated reasons:
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// * The stack guarantees 1 + EXTRA_STACK room beyond stack_last (see luaD_reallocstack) will be allocated
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// * we cannot move luaD_checkstack above because the arguments are *sometimes* pointers to the lua
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// stack and checkstack may invalidate those pointers
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// * we cannot use savestack/restorestack because the arguments are sometimes on the C++ stack
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// * during stack reallocation all of the allocated stack is copied (even beyond stack_last) so these
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// values will be preserved even if they go past stack_last
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LUAU_ASSERT((L->top + 3) < (L->stack + L->stacksize));
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setobj2s(L, L->top, f); /* push function */
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setobj2s(L, L->top + 1, p1); /* 1st argument */
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setobj2s(L, L->top + 2, p2); /* 2nd argument */
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luaD_checkstack(L, 3);
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L->top += 3;
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luaD_call(L, L->top - 3, 1);
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res = restorestack(L, result);
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L->top--;
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setobjs2s(L, res, L->top);
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}
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static void callTM(lua_State* L, const TValue* f, const TValue* p1, const TValue* p2, const TValue* p3)
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{
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// RBOLOX: using stack room beyond top is technically safe here, but for very complicated reasons:
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// * The stack guarantees 1 + EXTRA_STACK room beyond stack_last (see luaD_reallocstack) will be allocated
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// * we cannot move luaD_checkstack above because the arguments are *sometimes* pointers to the lua
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// stack and checkstack may invalidate those pointers
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// * we cannot use savestack/restorestack because the arguments are sometimes on the C++ stack
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// * during stack reallocation all of the allocated stack is copied (even beyond stack_last) so these
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// values will be preserved even if they go past stack_last
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LUAU_ASSERT((L->top + 4) < (L->stack + L->stacksize));
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setobj2s(L, L->top, f); /* push function */
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setobj2s(L, L->top + 1, p1); /* 1st argument */
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setobj2s(L, L->top + 2, p2); /* 2nd argument */
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setobj2s(L, L->top + 3, p3); /* 3th argument */
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luaD_checkstack(L, 4);
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L->top += 4;
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luaD_call(L, L->top - 4, 0);
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}
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void luaV_gettable(lua_State* L, const TValue* t, TValue* key, StkId val)
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{
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int loop;
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for (loop = 0; loop < MAXTAGLOOP; loop++)
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{
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const TValue* tm;
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if (ttistable(t))
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{ /* `t' is a table? */
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Table* h = hvalue(t);
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const TValue* res = luaH_get(h, key); /* do a primitive get */
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if (res != luaO_nilobject)
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L->cachedslot = gval2slot(h, res); /* remember slot to accelerate future lookups */
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if (!ttisnil(res) /* result is no nil? */
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|| (tm = fasttm(L, h->metatable, TM_INDEX)) == NULL)
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{ /* or no TM? */
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setobj2s(L, val, res);
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return;
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}
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/* t isn't a table, so see if it has an INDEX meta-method to look up the key with */
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}
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else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_INDEX)))
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luaG_indexerror(L, t, key);
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if (ttisfunction(tm))
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{
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callTMres(L, val, tm, t, key);
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return;
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}
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t = tm; /* else repeat with `tm' */
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}
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luaG_runerror(L, "loop in gettable");
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}
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void luaV_settable(lua_State* L, const TValue* t, TValue* key, StkId val)
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{
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int loop;
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TValue temp;
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for (loop = 0; loop < MAXTAGLOOP; loop++)
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{
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const TValue* tm;
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if (ttistable(t))
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{ /* `t' is a table? */
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Table* h = hvalue(t);
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if (h->readonly)
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luaG_runerror(L, "Attempt to modify a readonly table");
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TValue* oldval = luaH_set(L, h, key); /* do a primitive set */
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L->cachedslot = gval2slot(h, oldval); /* remember slot to accelerate future lookups */
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if (!ttisnil(oldval) || /* result is no nil? */
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(tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL)
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{ /* or no TM? */
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setobj2t(L, oldval, val);
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luaC_barriert(L, h, val);
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return;
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}
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/* else will try the tag method */
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}
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else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
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luaG_indexerror(L, t, key);
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if (ttisfunction(tm))
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{
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callTM(L, tm, t, key, val);
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return;
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}
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/* else repeat with `tm' */
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setobj(L, &temp, tm); /* avoid pointing inside table (may rehash) */
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t = &temp;
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}
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luaG_runerror(L, "loop in settable");
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}
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static int call_binTM(lua_State* L, const TValue* p1, const TValue* p2, StkId res, TMS event)
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{
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const TValue* tm = luaT_gettmbyobj(L, p1, event); /* try first operand */
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if (ttisnil(tm))
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tm = luaT_gettmbyobj(L, p2, event); /* try second operand */
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if (ttisnil(tm))
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return 0;
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callTMres(L, res, tm, p1, p2);
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return 1;
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}
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static const TValue* get_compTM(lua_State* L, Table* mt1, Table* mt2, TMS event)
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{
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const TValue* tm1 = fasttm(L, mt1, event);
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const TValue* tm2;
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if (tm1 == NULL)
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return NULL; /* no metamethod */
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if (mt1 == mt2)
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return tm1; /* same metatables => same metamethods */
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tm2 = fasttm(L, mt2, event);
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if (tm2 == NULL)
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return NULL; /* no metamethod */
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if (luaO_rawequalObj(tm1, tm2)) /* same metamethods? */
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return tm1;
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return NULL;
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}
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static int call_orderTM(lua_State* L, const TValue* p1, const TValue* p2, TMS event)
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{
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const TValue* tm1 = luaT_gettmbyobj(L, p1, event);
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const TValue* tm2;
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if (ttisnil(tm1))
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return -1; /* no metamethod? */
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tm2 = luaT_gettmbyobj(L, p2, event);
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if (!luaO_rawequalObj(tm1, tm2)) /* different metamethods? */
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return -1;
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callTMres(L, L->top, tm1, p1, p2);
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return !l_isfalse(L->top);
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}
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int luaV_strcmp(const TString* ls, const TString* rs)
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{
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if (ls == rs)
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return 0;
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const char* l = getstr(ls);
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size_t ll = ls->len;
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const char* r = getstr(rs);
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size_t lr = rs->len;
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size_t lmin = ll < lr ? ll : lr;
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int res = memcmp(l, r, lmin);
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if (res != 0)
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return res;
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return ll == lr ? 0 : ll < lr ? -1 : 1;
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}
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int luaV_lessthan(lua_State* L, const TValue* l, const TValue* r)
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{
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int res;
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if (ttype(l) != ttype(r))
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luaG_ordererror(L, l, r, TM_LT);
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else if (ttisnumber(l))
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return luai_numlt(nvalue(l), nvalue(r));
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else if (ttisstring(l))
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return luaV_strcmp(tsvalue(l), tsvalue(r)) < 0;
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else if ((res = call_orderTM(L, l, r, TM_LT)) == -1)
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luaG_ordererror(L, l, r, TM_LT);
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return res;
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}
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int luaV_lessequal(lua_State* L, const TValue* l, const TValue* r)
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{
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int res;
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if (ttype(l) != ttype(r))
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luaG_ordererror(L, l, r, TM_LE);
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else if (ttisnumber(l))
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return luai_numle(nvalue(l), nvalue(r));
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else if (ttisstring(l))
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return luaV_strcmp(tsvalue(l), tsvalue(r)) <= 0;
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else if ((res = call_orderTM(L, l, r, TM_LE)) != -1) /* first try `le' */
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return res;
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else if ((res = call_orderTM(L, r, l, TM_LT)) == -1) /* error if not `lt' */
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luaG_ordererror(L, l, r, TM_LE);
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return !res;
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}
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int luaV_equalval(lua_State* L, const TValue* t1, const TValue* t2)
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{
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const TValue* tm;
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LUAU_ASSERT(ttype(t1) == ttype(t2));
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switch (ttype(t1))
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{
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case LUA_TNIL:
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return 1;
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case LUA_TNUMBER:
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return luai_numeq(nvalue(t1), nvalue(t2));
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case LUA_TVECTOR:
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return luai_veceq(vvalue(t1), vvalue(t2));
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case LUA_TBOOLEAN:
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return bvalue(t1) == bvalue(t2); /* true must be 1 !! */
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case LUA_TLIGHTUSERDATA:
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return pvalue(t1) == pvalue(t2);
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case LUA_TUSERDATA:
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{
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tm = get_compTM(L, uvalue(t1)->metatable, uvalue(t2)->metatable, TM_EQ);
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if (!tm)
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return uvalue(t1) == uvalue(t2);
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break; /* will try TM */
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}
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case LUA_TTABLE:
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{
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tm = get_compTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ);
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if (!tm)
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return hvalue(t1) == hvalue(t2);
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break; /* will try TM */
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}
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default:
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return gcvalue(t1) == gcvalue(t2);
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}
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callTMres(L, L->top, tm, t1, t2); /* call TM */
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return !l_isfalse(L->top);
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}
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void luaV_concat(lua_State* L, int total, int last)
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{
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do
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{
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StkId top = L->base + last + 1;
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int n = 2; /* number of elements handled in this pass (at least 2) */
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if (!(ttisstring(top - 2) || ttisnumber(top - 2)) || !tostring(L, top - 1))
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{
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if (!call_binTM(L, top - 2, top - 1, top - 2, TM_CONCAT))
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luaG_concaterror(L, top - 2, top - 1);
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}
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else if (tsvalue(top - 1)->len == 0) /* second op is empty? */
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(void)tostring(L, top - 2); /* result is first op (as string) */
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else
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{
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/* at least two string values; get as many as possible */
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size_t tl = tsvalue(top - 1)->len;
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char* buffer;
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int i;
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/* collect total length */
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for (n = 1; n < total && tostring(L, top - n - 1); n++)
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{
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size_t l = tsvalue(top - n - 1)->len;
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if (l > MAXSSIZE - tl)
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luaG_runerror(L, "string length overflow");
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tl += l;
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}
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char buf[LUA_BUFFERSIZE];
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TString* ts = nullptr;
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if (tl < LUA_BUFFERSIZE)
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{
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buffer = buf;
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}
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else
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{
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ts = luaS_bufstart(L, tl);
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buffer = ts->data;
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}
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tl = 0;
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for (i = n; i > 0; i--)
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{ /* concat all strings */
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size_t l = tsvalue(top - i)->len;
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memcpy(buffer + tl, svalue(top - i), l);
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tl += l;
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}
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if (tl < LUA_BUFFERSIZE)
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{
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setsvalue2s(L, top - n, luaS_newlstr(L, buffer, tl));
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}
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else
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{
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setsvalue2s(L, top - n, luaS_buffinish(L, ts));
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}
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}
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total -= n - 1; /* got `n' strings to create 1 new */
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last -= n - 1;
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} while (total > 1); /* repeat until only 1 result left */
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}
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void luaV_doarith(lua_State* L, StkId ra, const TValue* rb, const TValue* rc, TMS op)
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{
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TValue tempb, tempc;
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const TValue *b, *c;
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if ((b = luaV_tonumber(rb, &tempb)) != NULL && (c = luaV_tonumber(rc, &tempc)) != NULL)
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{
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double nb = nvalue(b), nc = nvalue(c);
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switch (op)
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{
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case TM_ADD:
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setnvalue(ra, luai_numadd(nb, nc));
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break;
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case TM_SUB:
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setnvalue(ra, luai_numsub(nb, nc));
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break;
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case TM_MUL:
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setnvalue(ra, luai_nummul(nb, nc));
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break;
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case TM_DIV:
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setnvalue(ra, luai_numdiv(nb, nc));
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break;
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case TM_MOD:
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setnvalue(ra, luai_nummod(nb, nc));
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break;
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case TM_POW:
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setnvalue(ra, luai_numpow(nb, nc));
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break;
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case TM_UNM:
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setnvalue(ra, luai_numunm(nb));
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break;
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default:
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LUAU_ASSERT(0);
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break;
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}
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}
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else
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{
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// vector operations that we support: v + v, v - v, v * v, s * v, v * s, v / v, s / v, v / s, -v
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const float* vb = luaV_tovector(rb);
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const float* vc = luaV_tovector(rc);
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if (vb && vc)
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{
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switch (op)
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{
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case TM_ADD:
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setvvalue(ra, vb[0] + vc[0], vb[1] + vc[1], vb[2] + vc[2]);
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return;
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case TM_SUB:
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setvvalue(ra, vb[0] - vc[0], vb[1] - vc[1], vb[2] - vc[2]);
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return;
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case TM_MUL:
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setvvalue(ra, vb[0] * vc[0], vb[1] * vc[1], vb[2] * vc[2]);
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return;
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case TM_DIV:
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setvvalue(ra, vb[0] / vc[0], vb[1] / vc[1], vb[2] / vc[2]);
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return;
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case TM_UNM:
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setvvalue(ra, -vb[0], -vb[1], -vb[2]);
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return;
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default:
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break;
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}
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}
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else if (vb)
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{
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c = luaV_tonumber(rc, &tempc);
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if (c)
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{
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float nc = cast_to(float, nvalue(c));
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switch (op)
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{
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case TM_MUL:
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setvvalue(ra, vb[0] * nc, vb[1] * nc, vb[2] * nc);
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return;
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case TM_DIV:
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setvvalue(ra, vb[0] / nc, vb[1] / nc, vb[2] / nc);
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return;
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default:
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break;
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}
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}
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}
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else if (vc)
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{
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b = luaV_tonumber(rb, &tempb);
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if (b)
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{
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float nb = cast_to(float, nvalue(b));
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switch (op)
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{
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case TM_MUL:
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setvvalue(ra, nb * vc[0], nb * vc[1], nb * vc[2]);
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return;
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case TM_DIV:
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setvvalue(ra, nb / vc[0], nb / vc[1], nb / vc[2]);
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return;
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default:
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break;
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}
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}
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}
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if (!call_binTM(L, rb, rc, ra, op))
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{
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luaG_aritherror(L, rb, rc, op);
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}
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}
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}
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void luaV_dolen(lua_State* L, StkId ra, const TValue* rb)
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{
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switch (ttype(rb))
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{
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case LUA_TTABLE:
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{
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setnvalue(ra, cast_num(luaH_getn(hvalue(rb))));
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break;
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}
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case LUA_TSTRING:
|
|
{
|
|
setnvalue(ra, cast_num(tsvalue(rb)->len));
|
|
break;
|
|
}
|
|
default:
|
|
{ /* try metamethod */
|
|
if (!call_binTM(L, rb, luaO_nilobject, ra, TM_LEN))
|
|
luaG_typeerror(L, rb, "get length of");
|
|
}
|
|
}
|
|
}
|