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Implement LEN.

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Enables length of tables and strings to be taken, for example:

t = "hello"
print(#t) -- prints 5
t = {1,2}
print(#t) -- prints 2
This commit is contained in:
Michael Munday 2016-12-22 14:59:37 -05:00
parent c0c155e45e
commit 077ccc8658
1 changed files with 56 additions and 4 deletions
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60
src/vm_s390x.dasc
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@ -845,8 +845,28 @@ static void build_subroutines(BuildCtx *ctx)
| j ->vm_call_dispatch
|
|->vmeta_len:
| stg r0, 0(r0)
| stg r0, 0(r0)
| llgh RD, PC_RD
| sllg RD, RD, 3(r0)
| lg L:RB, SAVE_L
| stg BASE, L:RB->base
| la CARG2, 0(RD, BASE)
| lgr L:CARG1, L:RB
| stg PC, SAVE_PC
| brasl r14, extern lj_meta_len // (lua_State *L, TValue *o)
| // NULL (retry) or TValue * (metamethod) returned in r2 (CRET1).
| lgr RC, CRET1
| lg BASE, L:RB->base
#if LJ_52
| cghi RC, 0
| jne ->vmeta_binop // Binop call for compatibility.
| llgh RD, PC_RD
| sllg RD, RD, 3(r0)
| lg TAB:CARG1, 0(RD, BASE)
| cleartp TAB:CARG1
| j ->BC_LEN_Z
#else
| j ->vmeta_binop // Binop call for compatibility.
#endif
|
|//-- Call metamethod ----------------------------------------------------
|
@ -1698,8 +1718,40 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
| j <1
break;
case BC_LEN:
| stg r0, 0(r0)
| stg r0, 0(r0)
| ins_AD // RA = dst, RD = src
| sllg RD, RD, 3(r0)
| lg RD, 0(RD, BASE)
| checkstr RD, >2
| llgf RD, STR:RD->len
|1:
| sllg RA, RA, 3(r0)
| setint RD
| stg RD, 0(RA, BASE)
| ins_next
|2:
| cghi ITYPE, LJ_TTAB; jne ->vmeta_len
| lgr TAB:CARG1, TAB:RD
#if LJ_52
| lg TAB:RB, TAB:RD->metatable
| cghi TAB:RB, 0
| jne >9
|3:
#endif
|->BC_LEN_Z:
| lgr RB, BASE // Save BASE.
| brasl r14, extern lj_tab_len // (GCtab *t)
| // Length of table returned in r2 (CRET1).
| lgr RD, CRET1
| lgr BASE, RB // Restore BASE.
| llgc RA, PC_RA
| j <1
#if LJ_52
|9: // Check for __len.
| llgc TMPR2, TAB:RB->nomm
| tmll TMPR2, 1<<MM_len
| jne <3
| j ->vmeta_len // 'no __len' flag NOT set: check.
#endif
break;
/* -- Binary ops -------------------------------------------------------- */