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Towards a new implementation of arrays

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The array part of a table wastes too much space, due to padding.
To avoid that, we need to store values in the array as something
different from a TValue. Therefore, the API for table access
should not assume that any value in a table lives in a *TValue.
This commit is the first step to remove that assumption: functions
luaH_get*, instead of returning a *TValue where the value lives,
receive a *TValue where to put the value being accessed.
(We still have to change the luaH_set* functions.)
This commit is contained in:
Roberto Ierusalimschy
2023-05-15 17:56:25 -03:00
parent 6443185167
commit 351ccd7332
5 changed files with 108 additions and 59 deletions
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17
lvm.h
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@@ -89,6 +89,10 @@ typedef enum {
!isempty(slot))) /* result not empty? */
#define luaV_fastget1(t,k,res,f, aux) \
(aux = (!ttistable(t) ? HNOTATABLE : f(hvalue(t), k, res)))
/*
** Special case of 'luaV_fastget' for integers, inlining the fast case
** of 'luaH_getint'.
@@ -100,6 +104,15 @@ typedef enum {
? &hvalue(t)->array[k - 1] : luaH_getint(hvalue(t), k), \
!isempty(slot))) /* result not empty? */
#define luaV_fastgeti1(t,k,val,aux) \
if (!ttistable(t)) aux = HNOTATABLE; \
else { Table *h = hvalue(t); lua_Unsigned u = l_castS2U(k); \
if ((u - 1u < h->alimit)) { \
int tag = *getArrTag(h,u); \
if (tagisempty(tag)) aux = HNOTFOUND; \
else { arr2val(h, u, tag, val); aux = HOK; }} \
else { aux = luaH_getint1(h, u, val); }}
/*
** Finish a fast set operation (when fast get succeeds). In that case,
@@ -125,8 +138,8 @@ LUAI_FUNC int luaV_tointeger (const TValue *obj, lua_Integer *p, F2Imod mode);
LUAI_FUNC int luaV_tointegerns (const TValue *obj, lua_Integer *p,
F2Imod mode);
LUAI_FUNC int luaV_flttointeger (lua_Number n, lua_Integer *p, F2Imod mode);
LUAI_FUNC void luaV_finishget (lua_State *L, const TValue *t, TValue *key,
StkId val, const TValue *slot);
LUAI_FUNC void luaV_finishget1 (lua_State *L, const TValue *t, TValue *key,
StkId val, int aux);
LUAI_FUNC void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
TValue *val, const TValue *slot);
LUAI_FUNC void luaV_finishOp (lua_State *L);