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detail ('codearith' uses 'LUA_OP*' constants instead of 'OP_*')

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This commit is contained in:
Roberto Ierusalimschy 2014-03-06 10:39:05 -03:00
parent f69e0ade19
commit fa7e77fd38
1 changed files with 15 additions and 10 deletions
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25
lcode.c
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@ -1,5 +1,5 @@
/*
** $Id: lcode.c,v 2.78 2014/01/27 13:34:32 roberto Exp $
** $Id: lcode.c,v 2.79 2014/02/06 19:55:55 roberto Exp roberto $
** Code generator for Lua
** See Copyright Notice in lua.h
*/
@ -750,29 +750,34 @@ void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) {
}
/* return false if folding can raise an error */
/*
** return false if folding can raise an error
*/
static int validop (OpCode op, TValue *v1, TValue *v2) {
lua_Integer i;
switch (op) {
case OP_IDIV: /* division by 0 and conversion errors */
case LUA_OPIDIV: /* division by 0 and conversion errors */
return (tointeger(v1, &i) && tointeger(v2, &i) && i != 0);
case OP_BAND: case OP_BOR: case OP_BXOR:
case OP_SHL: case OP_SHR: case OP_BNOT: /* conversion errors */
case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:
case LUA_OPSHL: case LUA_OPSHR: case LUA_OPBNOT: /* conversion errors */
return (tointeger(v1, &i) && tointeger(v2, &i));
case OP_MOD: /* integer module by 0 */
case LUA_OPMOD: /* integer module by 0 */
return !(ttisinteger(v1) && ttisinteger(v2) && ivalue(v2) == 0);
case OP_POW: /* negative integer exponentiation */
case LUA_OPPOW: /* negative integer exponentiation */
return !(ttisinteger(v1) && ttisinteger(v2) && ivalue(v2) < 0);
default: return 1; /* everything else is valid */
}
}
static int constfolding (OpCode op, expdesc *e1, expdesc *e2) {
/*
** Try to "constant-fold" an operation; return 1 iff successful
*/
static int constfolding (int op, expdesc *e1, expdesc *e2) {
TValue v1, v2, res;
if (!tonumeral(e1, &v1) || !tonumeral(e2, &v2) || !validop(op, &v1, &v2))
return 0; /* non-numeric operands or not safe to fold */
luaO_arith(NULL, op - OP_ADD + LUA_OPADD, &v1, &v2, &res);
luaO_arith(NULL, op, &v1, &v2, &res);
if (ttisinteger(&res)) {
e1->k = VKINT;
e1->u.ival = ivalue(&res);
@ -790,7 +795,7 @@ static int constfolding (OpCode op, expdesc *e1, expdesc *e2) {
static void codearith (FuncState *fs, OpCode op,
expdesc *e1, expdesc *e2, int line) {
if (!constfolding(op, e1, e2)) { /* could not fold operation? */
if (!constfolding(op - OP_ADD + LUA_OPADD, e1, e2)) {
int o1, o2;
if (op == OP_UNM || op == OP_BNOT || op == OP_LEN) {
o2 = 0;