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https://github.com/lua/lua
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two small bugs: some metamethods do not accept callable non-function
objects + __concat converts numbers to strings before calling metamethod
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13
lvm.c
13
lvm.c
@ -1,5 +1,5 @@
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/*
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** $Id: lvm.c,v 2.69 2006/09/19 14:06:45 roberto Exp roberto $
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** $Id: lvm.c,v 2.70 2007/02/09 13:04:52 roberto Exp roberto $
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** Lua virtual machine
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** See Copyright Notice in lua.h
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*/
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@ -162,7 +162,7 @@ static int call_binTM (lua_State *L, const TValue *p1, const TValue *p2,
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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 (!ttisfunction(tm)) return 0;
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if (ttisnil(tm)) 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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@ -257,8 +257,7 @@ int luaV_equalval_ (lua_State *L, const TValue *t1, const TValue *t2) {
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case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
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case LUA_TUSERDATA: {
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if (uvalue(t1) == uvalue(t2)) return 1;
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tm = get_compTM(L, uvalue(t1)->metatable, uvalue(t2)->metatable,
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TM_EQ);
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tm = get_compTM(L, uvalue(t1)->metatable, uvalue(t2)->metatable, TM_EQ);
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break; /* will try TM */
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}
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case LUA_TTABLE: {
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@ -278,12 +277,12 @@ void luaV_concat (lua_State *L, int total, int last) {
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do {
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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 (!tostring(L, top-2) || !tostring(L, top-1)) {
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if (!(ttisstring(top-2) || ttisnumber(top-2)) || !tostring(L, top-1)) {
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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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} else if (tsvalue(top-1)->len == 0) { /* second operand is empty? */
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/* do nothing; result is already first operand */ ;
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} else if (tsvalue(top-2)->len == 0) { /* fist operand is empty? */
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(void)tostring(L, top - 2); /* result is first operand */ ;
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} else if (ttisstring(top-2) && tsvalue(top-2)->len == 0) {
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setsvalue2s(L, top-2, rawtsvalue(top-1)); /* result is second op. */
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} else {
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/* at least two (non-empty) string values; get as many as possible */
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