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new fallback __le (less equal), for partial order

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This commit is contained in:
Roberto Ierusalimschy 2002-06-12 11:56:22 -03:00
parent 6b8cdc9cdd
commit eeab473fc8
9 changed files with 77 additions and 69 deletions
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4
lapi.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lapi.c,v 1.195 2002/06/03 20:11:07 roberto Exp roberto $
** $Id: lapi.c,v 1.196 2002/06/06 12:40:22 roberto Exp roberto $
** Lua API
** See Copyright Notice in lua.h
*/
@ -226,7 +226,7 @@ LUA_API int lua_lessthan (lua_State *L, int index1, int index2) {
o1 = luaA_indexAcceptable(L, index1);
o2 = luaA_indexAcceptable(L, index2);
i = (o1 == NULL || o2 == NULL) ? 0 /* index out-of-range */
: luaV_cmp(L, o1, o2, CMP_LT);
: luaV_lessthan(L, o1, o2);
lua_unlock(L);
return i;
}

35
lcode.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lcode.c,v 1.105 2002/05/27 20:35:40 roberto Exp roberto $
** $Id: lcode.c,v 1.106 2002/06/03 12:59:26 roberto Exp roberto $
** Code generator for Lua
** See Copyright Notice in lua.h
*/
@ -460,19 +460,8 @@ void luaK_self (FuncState *fs, expdesc *e, expdesc *key) {
static void invertjump (FuncState *fs, expdesc *e) {
Instruction *pc = getjumpcontrol(fs, e->info);
OpCode op = GET_OPCODE(*pc);
switch (op) {
case OP_EQ: {
SETARG_B(*pc, !(GETARG_B(*pc)));
return;
}
case OP_CMP: {
SETARG_B(*pc, ~(GETARG_B(*pc)));
return;
}
default: lua_assert(0); /* invalid jump instruction */
}
SET_OPCODE(*pc, op);
lua_assert(testOpMode(GET_OPCODE(*pc), OpModeT));
SETARG_B(*pc, !(GETARG_B(*pc)));
}
@ -629,12 +618,6 @@ void luaK_infix (FuncState *fs, BinOpr op, expdesc *v) {
}
static const int cmp_masks[] = { /* ORDER OPR */
CMP_LT, (CMP_LT | CMP_EQ), CMP_GT, (CMP_GT | CMP_EQ)
};
static void codebinop (FuncState *fs, expdesc *res, BinOpr op,
int o1, int o2, int ic) {
switch (op) {
@ -644,7 +627,7 @@ static void codebinop (FuncState *fs, expdesc *res, BinOpr op,
lua_assert(!ic);
/* go through */
case OPR_ADD:
case OPR_MULT: {
case OPR_MULT: { /* ORDER OPR */
OpCode opc = cast(OpCode, (op - OPR_ADD) + OP_ADD);
res->info = luaK_codeABC(fs, opc, 0, o1, o2);
res->k = VRELOCABLE;
@ -659,11 +642,13 @@ static void codebinop (FuncState *fs, expdesc *res, BinOpr op,
case OPR_LT:
case OPR_LE:
case OPR_GT:
case OPR_GE: {
int mask = cmp_masks[op - OPR_LT];
case OPR_GE: { /* ORDER OPR */
OpCode opc;
int i = op - OPR_LT;
if (ic) /* operands were interchanged? */
mask ^= (CMP_LT | CMP_GT); /* correct condition */
res->info = luaK_condjump(fs, OP_CMP, o1, mask, o2);
i = (i+2)&3; /* correct operator */
opc = cast(OpCode, i + OP_LT);
res->info = luaK_condjump(fs, opc, o1, 1, o2);
res->k = VJMP;
break;
}

10
lobject.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lobject.h,v 1.132 2002/05/15 18:57:44 roberto Exp roberto $
** $Id: lobject.h,v 1.133 2002/05/16 18:39:46 roberto Exp roberto $
** Type definitions for Lua objects
** See Copyright Notice in lua.h
*/
@ -230,14 +230,6 @@ typedef struct Table {
#define sizearray(t) ((t)->sizearray)
/*
** masks for comparison results
*/
#define CMP_EQ 1
#define CMP_LT 2
#define CMP_GT 4
#define CMP_N 8 /* not comparable values (e.g. NaN) */
extern const TObject luaO_nilobject;

12
lopcodes.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lopcodes.c,v 1.18 2002/05/06 15:51:41 roberto Exp roberto $
** $Id: lopcodes.c,v 1.19 2002/05/13 13:09:00 roberto Exp roberto $
** extracted automatically from lopcodes.h by mkprint.lua
** DO NOT EDIT
** See Copyright Notice in lua.h
@ -37,7 +37,10 @@ const char *const luaP_opnames[] = {
"CONCAT",
"JMP",
"EQ",
"CMP",
"LT",
"LE",
"GT",
"GE",
"TEST",
"CALL",
"TAILCALL",
@ -82,7 +85,10 @@ const lu_byte luaP_opmodes[NUM_OPCODES] = {
,opmode(0,0,1,1, 1,0,iABC) /* OP_CONCAT */
,opmode(0,0,0,0, 0,0,iAsBx) /* OP_JMP */
,opmode(1,0,0,1, 0,0,iABC) /* OP_EQ */
,opmode(1,0,0,1, 0,0,iABC) /* OP_CMP */
,opmode(1,0,0,1, 0,0,iABC) /* OP_LT */
,opmode(1,0,0,1, 0,0,iABC) /* OP_LE */
,opmode(1,0,0,1, 0,0,iABC) /* OP_GT */
,opmode(1,0,0,1, 0,0,iABC) /* OP_GE */
,opmode(1,0,0,1, 1,0,iABC) /* OP_TEST */
,opmode(0,0,0,0, 0,0,iABC) /* OP_CALL */
,opmode(0,0,0,0, 0,0,iABC) /* OP_TAILCALL */

7
lopcodes.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lopcodes.h,v 1.97 2002/05/13 13:09:00 roberto Exp roberto $
** $Id: lopcodes.h,v 1.98 2002/06/06 18:17:33 roberto Exp roberto $
** Opcodes for Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -158,7 +158,10 @@ OP_CONCAT,/* A B C R(A) := R(B).. ... ..R(C) */
OP_JMP,/* sBx PC += sBx */
OP_EQ,/* A B C if ((R(A) == R/K(C)) ~= B) then pc++ */
OP_CMP,/* A B C if not (R(A) <B> R/K(C)) then pc++ (see note) */
OP_LT,/* A B C if ((R(A) < R/K(C)) ~= B) then pc++ */
OP_LE,/* A B C if ((R(A) <= R/K(C)) ~= B) then pc++ */
OP_GT,/* A B C if ((R(A) > R/K(C)) ~= B) then pc++ */
OP_GE,/* A B C if ((R(A) >= R/K(C)) ~= B) then pc++ */
OP_TEST,/* A B C if (R(C) <=> B) then R(A) := R(C) else pc++ */

7
ltm.c
View File

@ -1,5 +1,5 @@
/*
** $Id: ltm.c,v 1.92 2002/05/27 20:35:40 roberto Exp roberto $
** $Id: ltm.c,v 1.93 2002/06/03 14:09:57 roberto Exp roberto $
** Tag methods
** See Copyright Notice in lua.h
*/
@ -28,8 +28,8 @@ void luaT_init (lua_State *L) {
"__gettable", "__settable", "__index", "__newindex",
"__gc", "__weakmode",
"__add", "__sub", "__mul", "__div",
"__pow", "__unm", "__lt", "__concat",
"__call"
"__pow", "__unm", "__lt", "__le",
"__concat", "__call"
};
int i;
for (i=0; i<TM_N; i++) {
@ -45,6 +45,7 @@ void luaT_init (lua_State *L) {
*/
const TObject *luaT_gettm (Table *events, TMS event, TString *ename) {
const TObject *tm = luaH_getstr(events, ename);
lua_assert(event <= TM_WEAKMODE);
if (ttype(tm) == LUA_TNIL) { /* no tag method? */
events->flags |= (1u<<event); /* cache this fact */
return NULL;

5
ltm.h
View File

@ -1,5 +1,5 @@
/*
** $Id: ltm.h,v 1.32 2002/05/20 19:51:06 roberto Exp roberto $
** $Id: ltm.h,v 1.33 2002/05/27 20:35:40 roberto Exp roberto $
** Tag methods
** See Copyright Notice in lua.h
*/
@ -20,7 +20,7 @@ typedef enum {
TM_INDEX,
TM_NEWINDEX,
TM_GC,
TM_WEAKMODE,
TM_WEAKMODE, /* last tag method with `fast' access */
TM_ADD,
TM_SUB,
TM_MUL,
@ -28,6 +28,7 @@ typedef enum {
TM_POW,
TM_UNM,
TM_LT,
TM_LE,
TM_CONCAT,
TM_CALL,
TM_N /* number of elements in the enum */

62
lvm.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lvm.c,v 1.235 2002/06/05 12:34:19 roberto Exp roberto $
** $Id: lvm.c,v 1.236 2002/06/06 18:17:33 roberto Exp roberto $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -207,14 +207,13 @@ static int luaV_strcmp (const TString *ls, const TString *rs) {
size_t lr = rs->tsv.len;
for (;;) {
int temp = strcoll(l, r);
if (temp < 0) return CMP_LT;
else if (temp > 0) return CMP_GT;
if (temp != 0) return temp;
else { /* strings are equal up to a `\0' */
size_t len = strlen(l); /* index of first `\0' in both strings */
if (len == lr) /* r is finished? */
return (len == ll) ? CMP_EQ : CMP_GT; /* l is eq. or gt. than r */
return (len == ll) ? 0 : 1;
else if (len == ll) /* l is finished? */
return CMP_LT; /* l is smaller than r (because r is not finished) */
return -1; /* l is smaller than r (because r is not finished) */
/* both strings longer than `len'; go on comparing (after the `\0') */
len++;
l += len; ll -= len; r += len; lr -= len;
@ -223,24 +222,30 @@ static int luaV_strcmp (const TString *ls, const TString *rs) {
}
int luaV_cmp (lua_State *L, const TObject *l, const TObject *r, int cond) {
if (ttype(l) == LUA_TNUMBER && ttype(r) == LUA_TNUMBER) {
lua_Number n1 = nvalue(l);
lua_Number n2 = nvalue(r);
if (n1 < n2) return (cond & CMP_LT);
else if (n1 > n2) return (cond & CMP_GT);
else if (n1 == n2) return (cond & CMP_EQ);
else return (cond & CMP_N);
}
int luaV_lessthan (lua_State *L, const TObject *l, const TObject *r) {
if (ttype(l) == LUA_TNUMBER && ttype(r) == LUA_TNUMBER)
return nvalue(l) < nvalue(r);
else if (ttype(l) == LUA_TSTRING && ttype(r) == LUA_TSTRING)
return luaV_strcmp(tsvalue(l), tsvalue(r)) & cond;
return luaV_strcmp(tsvalue(l), tsvalue(r)) < 0;
else { /* try TM */
if (cond & CMP_EQ ? cond & CMP_LT : cond & CMP_GT) { /* `<=' or `>' ? */
const TObject *temp = l; l = r; r = temp; /* exchange terms */
}
if (!call_binTM(L, l, r, L->top, TM_LT))
luaG_ordererror(L, l, r);
return (cond & CMP_EQ) ? l_isfalse(L->top) : !l_isfalse(L->top);
return !l_isfalse(L->top);
}
}
static int luaV_lessequal (lua_State *L, const TObject *l, const TObject *r) {
if (ttype(l) == LUA_TNUMBER && ttype(r) == LUA_TNUMBER)
return nvalue(l) <= nvalue(r);
else if (ttype(l) == LUA_TSTRING && ttype(r) == LUA_TSTRING)
return luaV_strcmp(tsvalue(l), tsvalue(r)) <= 0;
else { /* try TM */
if (call_binTM(L, l, r, L->top, TM_LE)) /* first try `le' */
return !l_isfalse(L->top);
else if (!call_binTM(L, r, l, L->top, TM_LT)) /* else try `lt' */
luaG_ordererror(L, l, r);
return l_isfalse(L->top);
}
}
@ -463,8 +468,23 @@ StkId luaV_execute (lua_State *L) {
else dojump(pc, GETARG_sBx(*pc) + 1);
break;
}
case OP_CMP: {
if (!(luaV_cmp(L, ra, RKC(i), GETARG_B(i)))) pc++;
case OP_LT: {
if (luaV_lessthan(L, ra, RKC(i)) != GETARG_B(i)) pc++;
else dojump(pc, GETARG_sBx(*pc) + 1);
break;
}
case OP_LE: {
if (luaV_lessequal(L, ra, RKC(i)) != GETARG_B(i)) pc++;
else dojump(pc, GETARG_sBx(*pc) + 1);
break;
}
case OP_GT: {
if (luaV_lessthan(L, RKC(i), ra) != GETARG_B(i)) pc++;
else dojump(pc, GETARG_sBx(*pc) + 1);
break;
}
case OP_GE: {
if (luaV_lessequal(L, RKC(i), ra) != GETARG_B(i)) pc++;
else dojump(pc, GETARG_sBx(*pc) + 1);
break;
}

4
lvm.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lvm.h,v 1.39 2002/05/06 15:51:41 roberto Exp roberto $
** $Id: lvm.h,v 1.40 2002/06/03 14:08:43 roberto Exp roberto $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -19,7 +19,7 @@
(((o) = luaV_tonumber(o,n)) != NULL))
int luaV_cmp (lua_State *L, const TObject *l, const TObject *r, int cond);
int luaV_lessthan (lua_State *L, const TObject *l, const TObject *r);
const TObject *luaV_tonumber (const TObject *obj, TObject *n);
int luaV_tostring (lua_State *L, TObject *obj);
void luaV_gettable (lua_State *L, const TObject *t, TObject *key, StkId res);