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keep `top' in registers when running basic tasks (settable, getglobal, ...)

This commit is contained in:
Roberto Ierusalimschy 2000-01-24 18:14:07 -02:00
parent 9744255ae9
commit 99e340b2ba
3 changed files with 56 additions and 64 deletions
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14
lapi.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lapi.c,v 1.68 2000/01/13 15:56:03 roberto Exp roberto $
** $Id: lapi.c,v 1.69 2000/01/19 12:00:45 roberto Exp roberto $
** Lua API
** See Copyright Notice in lua.h
*/
@ -123,7 +123,7 @@ lua_Object lua_seterrormethod (lua_State *L) {
lua_Object lua_gettable (lua_State *L) {
luaA_checkCparams(L, 2);
luaV_gettable(L);
luaV_gettable(L, L->top--);
return luaA_putObjectOnTop(L);
}
@ -139,10 +139,12 @@ lua_Object lua_rawgettable (lua_State *L) {
void lua_settable (lua_State *L) {
StkId top;
luaA_checkCparams(L, 3);
luaD_checkstack(L, 3); /* may need that to call a tag method */
luaV_settable(L, L->top-3);
L->top -= 2; /* pop table and index */
top = L->top;
luaV_settable(L, top-3, top);
L->top = top-3; /* pop table, index, and value */
}
@ -163,7 +165,7 @@ lua_Object lua_createtable (lua_State *L) {
lua_Object lua_getglobal (lua_State *L, const char *name) {
luaD_checkstack(L, 3); /* may need that to call a tag method */
luaV_getglobal(L, luaS_assertglobalbyname(L, name));
luaV_getglobal(L, luaS_assertglobalbyname(L, name), L->top++);
return luaA_putObjectOnTop(L);
}
@ -177,7 +179,7 @@ lua_Object lua_rawgetglobal (lua_State *L, const char *name) {
void lua_setglobal (lua_State *L, const char *name) {
luaA_checkCparams(L, 1);
luaD_checkstack(L, 3); /* may need that to call a tag method */
luaV_setglobal(L, luaS_assertglobalbyname(L, name));
luaV_setglobal(L, luaS_assertglobalbyname(L, name), L->top--);
}

96
lvm.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lvm.c,v 1.80 2000/01/19 12:00:45 roberto Exp roberto $
** $Id: lvm.c,v 1.81 2000/01/19 16:50:30 roberto Exp roberto $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -103,13 +103,15 @@ void luaV_closure (lua_State *L, int nelems) {
** Function to index a table.
** Receives the table at top-2 and the index at top-1.
*/
void luaV_gettable (lua_State *L) {
TObject *table = L->top-2;
void luaV_gettable (lua_State *L, StkId top) {
TObject *table = top-2;
const TObject *im;
if (ttype(table) != LUA_T_ARRAY) { /* not a table, get gettable method */
im = luaT_getimbyObj(L, table, IM_GETTABLE);
if (ttype(im) == LUA_T_NIL)
if (ttype(im) == LUA_T_NIL) {
L->top = top;
luaG_indexerror(L, table);
}
}
else { /* object is a table... */
int tg = table->value.a->htag;
@ -119,28 +121,29 @@ void luaV_gettable (lua_State *L) {
if (ttype(h) == LUA_T_NIL &&
(ttype(im=luaT_getim(L, tg, IM_INDEX)) != LUA_T_NIL)) {
/* result is nil and there is an `index' tag method */
L->top = top;
luaD_callTM(L, im, 2, 1); /* calls it */
}
else {
L->top--;
else
*table = *h; /* `push' result into table position */
}
return;
}
/* else it has a `gettable' method, go through to next command */
}
/* object is not a table, or it has a `gettable' method */
L->top = top;
luaD_callTM(L, im, 2, 1);
}
/*
** Receives table at *t, index at *(t+1) and value at top.
** Receives table at *t, index at *(t+1) and value at `top'.
** WARNING: caller must assure 3 extra stack slots (to call a tag method)
*/
void luaV_settable (lua_State *L, StkId t) {
void luaV_settable (lua_State *L, StkId t, StkId top) {
const TObject *im;
if (ttype(t) != LUA_T_ARRAY) { /* not a table, get `settable' method */
L->top = top;
im = luaT_getimbyObj(L, t, IM_SETTABLE);
if (ttype(im) == LUA_T_NIL)
luaG_indexerror(L, t);
@ -148,20 +151,19 @@ void luaV_settable (lua_State *L, StkId t) {
else { /* object is a table... */
im = luaT_getim(L, avalue(t)->htag, IM_SETTABLE);
if (ttype(im) == LUA_T_NIL) { /* and does not have a `settable' method */
luaH_set(L, avalue(t), t+1, L->top-1);
L->top--; /* pop value */
luaH_set(L, avalue(t), t+1, top-1);
return;
}
/* else it has a `settable' method, go through to next command */
}
/* object is not a table, or it has a `settable' method */
/* prepare arguments and call the tag method */
*(L->top+2) = *(L->top-1);
*(L->top+1) = *(t+1);
*(L->top) = *t;
*(L->top-1) = *im;
L->top += 3;
luaD_call(L, L->top-4, 0);
*(top+2) = *(top-1);
*(top+1) = *(t+1);
*(top) = *t;
*(top-1) = *im;
L->top = top+3;
luaD_call(L, top-1, 0);
}
@ -178,18 +180,18 @@ void luaV_rawsettable (lua_State *L, StkId t) {
/*
** WARNING: caller must assure 3 extra stack slots (to call a tag method)
*/
void luaV_getglobal (lua_State *L, GlobalVar *gv) {
void luaV_getglobal (lua_State *L, GlobalVar *gv, StkId top) {
const TObject *value = &gv->value;
TObject *im = luaT_getimbyObj(L, value, IM_GETGLOBAL);
if (ttype(im) == LUA_T_NIL) /* is there a tag method? */
*L->top++ = *value; /* default behavior */
*top = *value; /* default behavior */
else { /* tag method */
*L->top = *im;
ttype(L->top+1) = LUA_T_STRING;
tsvalue(L->top+1) = gv->name; /* global name */
*(L->top+2) = *value;
L->top += 3;
luaD_call(L, L->top-3, 1);
*top = *im;
ttype(top+1) = LUA_T_STRING;
tsvalue(top+1) = gv->name; /* global name */
*(top+2) = *value;
L->top = top+3;
luaD_call(L, top, 1);
}
}
@ -197,19 +199,19 @@ void luaV_getglobal (lua_State *L, GlobalVar *gv) {
/*
** WARNING: caller must assure 3 extra stack slots (to call a tag method)
*/
void luaV_setglobal (lua_State *L, GlobalVar *gv) {
void luaV_setglobal (lua_State *L, GlobalVar *gv, StkId top) {
const TObject *oldvalue = &gv->value;
const TObject *im = luaT_getimbyObj(L, oldvalue, IM_SETGLOBAL);
if (ttype(im) == LUA_T_NIL) /* is there a tag method? */
gv->value = *(--L->top);
gv->value = *(top-1);
else {
*(L->top+2) = *(L->top-1); /* new value */
*(L->top+1) = *oldvalue;
ttype(L->top) = LUA_T_STRING;
tsvalue(L->top) = gv->name;
*(L->top-1) = *im;
L->top += 3;
luaD_call(L, L->top-4, 0);
*(top+2) = *(top-1); /* new value */
*(top+1) = *oldvalue;
ttype(top) = LUA_T_STRING;
tsvalue(top) = gv->name;
*(top-1) = *im;
L->top = top+3;
luaD_call(L, top-1, 0);
}
}
@ -385,18 +387,14 @@ StkId luaV_execute (lua_State *L, const Closure *cl, const TProtoFunc *tf,
case GETGLOBALW: aux += highbyte(L, *pc++);
case GETGLOBAL: aux += *pc++;
L->top = top;
LUA_ASSERT(L, ttype(&consts[aux]) == LUA_T_STRING, "unexpected type");
luaV_getglobal(L, tsvalue(&consts[aux])->u.s.gv);
luaV_getglobal(L, tsvalue(&consts[aux])->u.s.gv, top);
top++;
LUA_ASSERT(L, top==L->top, "top's not synchronized");
break;
case GETTABLE:
L->top = top;
luaV_gettable(L);
luaV_gettable(L, top);
top--;
LUA_ASSERT(L, top==L->top, "top's not synchronized");
break;
case GETDOTTEDW: aux += highbyte(L, *pc++);
@ -404,10 +402,8 @@ StkId luaV_execute (lua_State *L, const Closure *cl, const TProtoFunc *tf,
LUA_ASSERT(L, ttype(&consts[aux]) == LUA_T_STRING, "unexpected type");
ttype(top) = LUA_T_STRING;
tsvalue(top++) = tsvalue(&consts[aux]);
L->top = top;
luaV_gettable(L);
luaV_gettable(L, top);
top--;
LUA_ASSERT(L, top==L->top, "top's not synchronized");
break;
case PUSHSELFW: aux += highbyte(L, *pc++);
@ -417,8 +413,7 @@ StkId luaV_execute (lua_State *L, const Closure *cl, const TProtoFunc *tf,
LUA_ASSERT(L, ttype(&consts[aux]) == LUA_T_STRING, "unexpected type");
ttype(top) = LUA_T_STRING;
tsvalue(top++) = tsvalue(&consts[aux]);
L->top = top;
luaV_gettable(L);
luaV_gettable(L, top);
*(top-1) = receiver;
break;
}
@ -439,23 +434,18 @@ StkId luaV_execute (lua_State *L, const Closure *cl, const TProtoFunc *tf,
case SETGLOBALW: aux += highbyte(L, *pc++);
case SETGLOBAL: aux += *pc++;
LUA_ASSERT(L, ttype(&consts[aux]) == LUA_T_STRING, "unexpected type");
L->top = top;
luaV_setglobal(L, tsvalue(&consts[aux])->u.s.gv);
luaV_setglobal(L, tsvalue(&consts[aux])->u.s.gv, top);
top--;
LUA_ASSERT(L, top==L->top, "top's not synchronized");
break;
case SETTABLEPOP:
L->top = top;
luaV_settable(L, top-3);
luaV_settable(L, top-3, top);
top -= 3; /* pop table, index, and value */
break;
case SETTABLE:
L->top = top;
luaV_settable(L, top-3-(*pc++));
luaV_settable(L, top-3-(*pc++), top);
top--; /* pop value */
LUA_ASSERT(L, top==L->top, "top's not synchronized");
break;
case SETLISTW: aux += highbyte(L, *pc++);

10
lvm.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lvm.h,v 1.13 1999/12/01 19:50:08 roberto Exp roberto $
** $Id: lvm.h,v 1.14 2000/01/19 16:50:30 roberto Exp roberto $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -21,11 +21,11 @@ void luaV_pack (lua_State *L, StkId firstel, int nvararg, TObject *tab);
int luaV_tonumber (TObject *obj);
int luaV_tostring (lua_State *L, TObject *obj);
void luaV_setn (lua_State *L, Hash *t, int val);
void luaV_gettable (lua_State *L);
void luaV_settable (lua_State *L, StkId t);
void luaV_gettable (lua_State *L, StkId top);
void luaV_settable (lua_State *L, StkId t, StkId top);
void luaV_rawsettable (lua_State *L, StkId t);
void luaV_getglobal (lua_State *L, GlobalVar *gv);
void luaV_setglobal (lua_State *L, GlobalVar *gv);
void luaV_getglobal (lua_State *L, GlobalVar *gv, StkId top);
void luaV_setglobal (lua_State *L, GlobalVar *gv, StkId top);
StkId luaV_execute (lua_State *L, const Closure *cl, const TProtoFunc *tf, StkId base);
void luaV_closure (lua_State *L, int nelems);
void luaV_comparison (lua_State *L);