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revamp of fast track for table access (table set uses the same 

macros as table get + new macro for integer keys)
This commit is contained in:
Roberto Ierusalimschy 2017-05-11 15:57:46 -03:00
parent 7184f6343a
commit 7647d5d13d
3 changed files with 80 additions and 93 deletions
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41
lapi.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lapi.c,v 2.264 2017/04/20 18:22:44 roberto Exp roberto $
** $Id: lapi.c,v 2.265 2017/04/24 16:59:26 roberto Exp roberto $
** Lua API
** See Copyright Notice in lua.h
*/
@ -609,10 +609,15 @@ LUA_API int lua_getglobal (lua_State *L, const char *name) {
LUA_API int lua_gettable (lua_State *L, int idx) {
const TValue *slot;
StkId t;
lua_lock(L);
t = index2addr(L, idx);
luaV_gettable(L, t, L->top - 1, L->top - 1);
if (luaV_fastget(L, t, L->top - 1, slot, luaH_get)) {
setobj2s(L, L->top - 1, slot);
}
else
luaV_finishget(L, t, L->top - 1, L->top - 1, slot);
lua_unlock(L);
return ttnov(L->top - 1);
}
@ -629,15 +634,15 @@ LUA_API int lua_geti (lua_State *L, int idx, lua_Integer n) {
const TValue *slot;
lua_lock(L);
t = index2addr(L, idx);
if (luaV_fastget(L, t, n, slot, luaH_getint)) {
if (luaV_fastgeti(L, t, n, slot)) {
setobj2s(L, L->top, slot);
api_incr_top(L);
}
else {
setivalue(L->top, n);
api_incr_top(L);
luaV_finishget(L, t, L->top - 1, L->top - 1, slot);
TValue aux;
setivalue(&aux, n);
luaV_finishget(L, t, &aux, L->top, slot);
}
api_incr_top(L);
lua_unlock(L);
return ttnov(L->top - 1);
}
@ -743,8 +748,10 @@ static void auxsetstr (lua_State *L, const TValue *t, const char *k) {
const TValue *slot;
TString *str = luaS_new(L, k);
api_checknelems(L, 1);
if (luaV_fastset(L, t, str, slot, luaH_getstr, L->top - 1))
if (luaV_fastget(L, t, str, slot, luaH_getstr)) {
luaV_finishfastset(L, t, slot, L->top - 1);
L->top--; /* pop value */
}
else {
setsvalue2s(L, L->top, str); /* push 'str' (to make it a TValue) */
api_incr_top(L);
@ -764,10 +771,14 @@ LUA_API void lua_setglobal (lua_State *L, const char *name) {
LUA_API void lua_settable (lua_State *L, int idx) {
StkId t;
const TValue *slot;
lua_lock(L);
api_checknelems(L, 2);
t = index2addr(L, idx);
luaV_settable(L, t, L->top - 2, L->top - 1);
if (luaV_fastget(L, t, L->top - 2, slot, luaH_get))
luaV_finishfastset(L, t, slot, L->top - 1);
else
luaV_finishset(L, t, L->top - 2, L->top - 1, slot);
L->top -= 2; /* pop index and value */
lua_unlock(L);
}
@ -785,14 +796,14 @@ LUA_API void lua_seti (lua_State *L, int idx, lua_Integer n) {
lua_lock(L);
api_checknelems(L, 1);
t = index2addr(L, idx);
if (luaV_fastset(L, t, n, slot, luaH_getint, L->top - 1))
L->top--; /* pop value */
if (luaV_fastgeti(L, t, n, slot))
luaV_finishfastset(L, t, slot, L->top - 1);
else {
setivalue(L->top, n);
api_incr_top(L);
luaV_finishset(L, t, L->top - 1, L->top - 2, slot);
L->top -= 2; /* pop value and key */
TValue aux;
setivalue(&aux, n);
luaV_finishset(L, t, &aux, L->top - 1, slot);
}
L->top--; /* pop value */
lua_unlock(L);
}

87
lvm.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lvm.c,v 2.278 2017/05/08 16:08:01 roberto Exp roberto $
** $Id: lvm.c,v 2.279 2017/05/10 17:32:19 roberto Exp roberto $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -182,7 +182,7 @@ void luaV_finishget (lua_State *L, const TValue *t, TValue *key, StkId val,
return;
}
t = tm; /* else try to access 'tm[key]' */
if (luaV_fastget(L,t,key,slot,luaH_get)) { /* fast track? */
if (luaV_fastget(L, t, key, slot, luaH_get)) { /* fast track? */
setobj2s(L, val, slot); /* done */
return;
}
@ -196,7 +196,7 @@ void luaV_finishget (lua_State *L, const TValue *t, TValue *key, StkId val,
** Finish a table assignment 't[key] = val'.
** If 'slot' is NULL, 't' is not a table. Otherwise, 'slot' points
** to the entry 't[key]', or to 'luaO_nilobject' if there is no such
** entry. (The value at 'slot' must be nil, otherwise 'luaV_fastset'
** entry. (The value at 'slot' must be nil, otherwise 'luaV_fastget'
** would have done the job.)
*/
void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
@ -229,9 +229,11 @@ void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
return;
}
t = tm; /* else repeat assignment over 'tm' */
if (luaV_fastset(L, t, key, slot, luaH_get, val))
if (luaV_fastget(L, t, key, slot, luaH_get)) {
luaV_finishfastset(L, t, slot, val);
return; /* done */
/* else loop */
}
/* else 'return luaV_finishset(L, t, key, val, slot)' (loop) */
}
luaG_runerror(L, "'__newindex' chain too long; possible loop");
}
@ -791,35 +793,6 @@ void luaV_finishOp (lua_State *L) {
#define vmbreak break
/*
** copy of 'luaV_gettable', but protecting the call to potential
** metamethod (which can reallocate the stack)
*/
#define gettableProtected(L,t,k,v) { const TValue *slot; \
if (luaV_fastget(L,t,k,slot,luaH_get)) { setobj2s(L, v, slot); } \
else Protect(luaV_finishget(L,t,k,v,slot)); }
/* same for 'luaV_settable' */
#define settableProtected(L,t,k,v) { const TValue *slot; \
if (!luaV_fastset(L,t,k,slot,luaH_get,v)) \
Protect(luaV_finishset(L,t,k,v,slot)); }
/*
** Predicate for integer fast track in GET/SETTABLE.
** (Strings are usually constant and therefore coded with
** GET/SETFIELD). Check that index is an integer, "table" is
** a table, index is in the array part, and value is not nil
** (otherwise it will need metamethods). Use 'n' and 't' for
** for caching the integer and table values.
*/
#define fastintindex(tbl,idx,t,n) \
(ttisinteger(idx) && ttistable(tbl) && \
(n = l_castS2U(ivalue(idx)) - 1u, t = hvalue(tbl), \
n < t->sizearray) && !ttisnil(&t->array[n]))
void luaV_execute (lua_State *L) {
CallInfo *ci = L->ci;
LClosure *cl;
@ -899,21 +872,24 @@ void luaV_execute (lua_State *L) {
vmbreak;
}
vmcase(OP_GETTABLE) {
const TValue *slot;
StkId rb = RB(i);
TValue *rc = RC(i);
Table *t; lua_Unsigned n;
if (fastintindex(rb, rc, t, n)) {
setobj2s(L, ra, &t->array[n]);
lua_Unsigned n;
if (ttisinteger(rc) /* fast track for integers? */
? (n = ivalue(rc), luaV_fastgeti(L, rb, n, slot))
: luaV_fastget(L, rb, rc, slot, luaH_get)) {
setobj2s(L, ra, slot);
}
else
gettableProtected(L, rb, rc, ra);
Protect(luaV_finishget(L, rb, rc, ra, slot));
vmbreak;
}
vmcase(OP_GETI) {
const TValue *slot;
StkId rb = RB(i);
int c = GETARG_C(i);
if (luaV_fastget(L, rb, c, slot, luaH_getint)) {
if (luaV_fastgeti(L, rb, c, slot)) {
setobj2s(L, ra, slot);
}
else {
@ -940,26 +916,32 @@ void luaV_execute (lua_State *L) {
TValue *rb = KB(i);
TValue *rc = RKC(i);
TString *key = tsvalue(rb); /* key must be a string */
if (!luaV_fastset(L, upval, key, slot, luaH_getstr, rc))
if (luaV_fastget(L, upval, key, slot, luaH_getstr))
luaV_finishfastset(L, upval, slot, rc);
else
Protect(luaV_finishset(L, upval, rb, rc, slot));
vmbreak;
}
vmcase(OP_SETTABLE) {
TValue *rb = RB(i);
TValue *rc = RKC(i);
Table *t; lua_Unsigned n;
if (fastintindex(ra, rb, t, n)) {
setobj2t(L, &t->array[n], rc);
}
const TValue *slot;
TValue *rb = RB(i); /* key (table is in 'ra') */
TValue *rc = RKC(i); /* value */
lua_Unsigned n;
if (ttisinteger(rb) /* fast track for integers? */
? (n = ivalue(rb), luaV_fastgeti(L, ra, n, slot))
: luaV_fastget(L, ra, rb, slot, luaH_get))
luaV_finishfastset(L, ra, slot, rc);
else
settableProtected(L, ra, rb, rc);
Protect(luaV_finishset(L, ra, rb, rc, slot));
vmbreak;
}
vmcase(OP_SETI) {
const TValue *slot;
int c = GETARG_B(i);
TValue *rc = RKC(i);
if (!luaV_fastset(L, ra, c, slot, luaH_getint, rc)) {
if (luaV_fastgeti(L, ra, c, slot))
luaV_finishfastset(L, ra, slot, rc);
else {
TValue key;
setivalue(&key, c);
Protect(luaV_finishset(L, ra, &key, rc, slot));
@ -971,7 +953,9 @@ void luaV_execute (lua_State *L) {
TValue *rb = KB(i);
TValue *rc = RKC(i);
TString *key = tsvalue(rb); /* key must be a string */
if (!luaV_fastset(L, ra, key, slot, luaH_getstr, rc))
if (luaV_fastget(L, ra, key, slot, luaH_getstr))
luaV_finishfastset(L, ra, slot, rc);
else
Protect(luaV_finishset(L, ra, rb, rc, slot));
vmbreak;
}
@ -1427,8 +1411,9 @@ void luaV_execute (lua_State *L) {
if (last > h->sizearray) /* needs more space? */
luaH_resizearray(L, h, last); /* preallocate it at once */
for (; n > 0; n--) {
TValue *val = ra+n;
luaH_setint(L, h, last--, val);
TValue *val = ra + n;
setobj2t(L, &h->array[last - 1], val);
last--;
luaC_barrierback(L, h, val);
}
L->top = ci->top; /* correct top (in case of previous open call) */

45
lvm.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lvm.h,v 2.40 2016/01/05 16:07:21 roberto Exp roberto $
** $Id: lvm.h,v 2.41 2016/12/22 13:08:50 roberto Exp roberto $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -50,10 +50,10 @@
/*
** fast track for 'gettable': if 't' is a table and 't[k]' is not nil,
** return 1 with 'slot' pointing to 't[k]' (final result). Otherwise,
** return 0 (meaning it will have to check metamethod) with 'slot'
** pointing to a nil 't[k]' (if 't' is a table) or NULL (otherwise).
** 'f' is the raw get function to use.
** return 1 with 'slot' pointing to 't[k]' (position of final result).
** Otherwise, return 0 (meaning it will have to check metamethod)
** with 'slot' pointing to a nil 't[k]' (if 't' is a table) or NULL
** (otherwise). 'f' is the raw get function to use.
*/
#define luaV_fastget(L,t,k,slot,f) \
(!ttistable(t) \
@ -61,36 +61,27 @@
: (slot = f(hvalue(t), k), /* else, do raw access */ \
!ttisnil(slot))) /* result not nil? */
/*
** standard implementation for 'gettable'
** Special case of 'luaV_fastget' for integers, inlining the fast case
** of 'luaH_getint'.
*/
#define luaV_gettable(L,t,k,v) { const TValue *slot; \
if (luaV_fastget(L,t,k,slot,luaH_get)) { setobj2s(L, v, slot); } \
else luaV_finishget(L,t,k,v,slot); }
#define luaV_fastgeti(L,t,k,slot) \
(!ttistable(t) \
? (slot = NULL, 0) /* not a table; 'slot' is NULL and result is 0 */ \
: (slot = (l_castS2U(k) - 1u < hvalue(t)->sizearray) \
? &hvalue(t)->array[k - 1] : luaH_getint(hvalue(t), k), \
!ttisnil(slot))) /* result not nil? */
/*
** Fast track for set table. If 't' is a table and 't[k]' is not nil,
** call GC barrier, do a raw 't[k]=v', and return true; otherwise,
** return false with 'slot' equal to NULL (if 't' is not a table) or
** 'nil'. (This is needed by 'luaV_finishget'.) Note that, if the macro
** returns true, there is no need to 'invalidateTMcache', because the
** call is not creating a new entry.
** Finish a fast set operation (when fast get succeeds). In that case,
** 'slot' points to the place to put the value.
*/
#define luaV_fastset(L,t,k,slot,f,v) \
(!ttistable(t) \
? (slot = NULL, 0) \
: (slot = f(hvalue(t), k), \
ttisnil(slot) ? 0 \
: (luaC_barrierback(L, hvalue(t), v), \
setobj2t(L, cast(TValue *,slot), v), \
1)))
#define luaV_finishfastset(L,t,slot,v) \
(setobj2t(L, cast(TValue *,slot), v), luaC_barrierback(L, hvalue(t), v))
#define luaV_settable(L,t,k,v) { const TValue *slot; \
if (!luaV_fastset(L,t,k,slot,luaH_get,v)) \
luaV_finishset(L,t,k,v,slot); }
LUAI_FUNC int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2);