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Implement TGETV and TSETV.

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Allows table entries to be get and set using variables, for example:

t = {4,5}
i = 1
print(t[i]) -- prints 4
t[i] = 3
print(t[i]) -- prints 3
This commit is contained in:
Michael Munday 2016-12-22 14:20:47 -05:00
parent 20f05a4e20
commit cab03375f1
1 changed files with 81 additions and 4 deletions
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85
src/vm_s390x.dasc
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@ -2026,8 +2026,42 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
break;
case BC_TGETV:
| stg r0, 0(r0)
| stg r0, 0(r0)
| ins_ABC // RA = dst, RB = table, RC = key
| sllg RB, RB, 3(r0)
| lg TAB:RB, 0(RB, BASE)
| sllg RC, RC, 3(r0)
| lg RC, 0(RC, BASE)
| checktab TAB:RB, ->vmeta_tgetv
|
| // Integer key?
| checkint RC, >5
| cl RC, TAB:RB->asize // Takes care of unordered, too.
| jhe ->vmeta_tgetv // Not in array part? Use fallback.
| llgfr RC, RC
| sllg RC, RC, 3(r0)
| ag RC, TAB:RB->array
| // Get array slot.
| lg ITYPE, 0(RC)
| cghi ITYPE, LJ_TNIL // Avoid overwriting RB in fastpath.
| je >2
|1:
| sllg RA, RA, 3(r0)
| stg ITYPE, 0(RA, BASE)
| ins_next
|
|2: // Check for __index if table value is nil.
| lg TAB:TMPR1, TAB:RB->metatable
| cghi TAB:TMPR1, 0
| je <1
| llgc TMPR2, TAB:TMPR1->nomm
| tmll TMPR2, 1<<MM_index
| je ->vmeta_tgetv // 'no __index' flag NOT set: check.
| j <1
|
|5: // String key?
| cghi ITYPE, LJ_TSTR; jne ->vmeta_tgetv
| cleartp STR:RC
| j ->BC_TGETS_Z
break;
case BC_TGETS:
| ins_ABC
@ -2104,9 +2138,52 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
| stg r0, 0(r0)
| stg r0, 0(r0)
break;
case BC_TSETV:
| stg r0, 0(r0)
| stg r0, 0(r0)
| ins_ABC // RA = src, RB = table, RC = key
| sllg RB, RB, 3(r0)
| lg TAB:RB, 0(RB, BASE)
| sllg RC, RC, 3(r0)
| lg RC, 0(RC, BASE)
| checktab TAB:RB, ->vmeta_tsetv
|
| // Integer key?
| checkint RC, >5
| cl RC, TAB:RB->asize // Takes care of unordered, too.
| jhe ->vmeta_tsetv
| llgfr RC, RC
| sllg RC, RC, 3(r0)
| ag RC, TAB:RB->array
| lghi TMPR2, LJ_TNIL
| cg TMPR2, 0(RC)
| je >3 // Previous value is nil?
|1:
| llgc TMPR1, TAB:RB->marked
| tmll TMPR1, LJ_GC_BLACK // isblack(table)
| jne >7
|2: // Set array slot.
| sllg RA, RA, 3(r0)
| lg RB, 0(RA, BASE)
| stg RB, 0(RC)
| ins_next
|
|3: // Check for __newindex if previous value is nil.
| lg TAB:TMPR1, TAB:RB->metatable
| cghi TAB:TMPR1, 0
| je <1
| llgc TMPR2, TAB:TMPR1->nomm
| tmll TMPR2, 1<<MM_newindex
| je ->vmeta_tsetv // 'no __newindex' flag NOT set: check.
| j <1
|
|5: // String key?
| cghi ITYPE, LJ_TSTR; jne ->vmeta_tsetv
| cleartp STR:RC
| j ->BC_TSETS_Z
|
|7: // Possible table write barrier for the value. Skip valiswhite check.
| barrierback TAB:RB, TMPR1
| j <2
break;
case BC_TSETS:
| stg r0, 0(r0)