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Implement USETV.

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Allows upvalues to be set in closures, for example:

function f(x)
  local y = x
  local j = function(z)
    y = y + z
  end
  for i=1,3 do
    j(i)
    print(y)
  end
end

f(2) -- prints: 3 5 8
This commit is contained in:
Michael Munday 2016-12-30 13:00:38 -05:00
parent 21073df0dc
commit a5d9604419
1 changed files with 41 additions and 2 deletions
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43
src/vm_s390x.dasc
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@ -2378,9 +2378,48 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
| ins_next
break;
case BC_USETV:
| stg r0, 0(r0)
| stg r0, 0(r0)
#define TV2MARKOFS \
((int32_t)offsetof(GCupval, marked)-(int32_t)offsetof(GCupval, tv))
| ins_AD // RA = upvalue #, RD = src
| lg LFUNC:RB, -16(BASE)
| cleartp LFUNC:RB
| sllg RA, RA, 3(r0)
| lg UPVAL:RB, (offsetof(GCfuncL, uvptr))(RA, LFUNC:RB)
| // TODO: (instead of next 2 instructions) tm UPVAL:RB->closed, 0xff
| llgc TMPR2, UPVAL:RB->closed
| tmll TMPR2, 0xff
| lg RB, UPVAL:RB->v
| sllg TMPR1, RD, 3(r0)
| lg RA, 0(TMPR1, BASE)
| stg RA, 0(RB)
| je >1
| // Check barrier for closed upvalue.
| // TODO: tmy TV2MARKOFS(RB), LJ_GC_BLACK // isblack(uv)
| llgc TMPR2, TV2MARKOFS(RB)
| tmll TMPR2, LJ_GC_BLACK
| jne >2
|1:
| ins_next
|
|2: // Upvalue is black. Check if new value is collectable and white.
| srag RD, RA, 47(r0)
| ahi RD, -LJ_TISGCV
| clfi RD, LJ_TNUMX - LJ_TISGCV // tvisgcv(v)
| jle <1
| cleartp GCOBJ:RA
| // TODO: tm GCOBJ:RA->gch.marked, LJ_GC_WHITES // iswhite(v)
| llgc TMPR2, GCOBJ:RA->gch.marked
| tmll TMPR2, LJ_GC_WHITES
| je <1
| // Crossed a write barrier. Move the barrier forward.
| lgr CARG2, RB
| lgr RB, BASE // Save BASE.
| lay GL:CARG1, GG_DISP2G(DISPATCH)
| brasl r14, extern lj_gc_barrieruv // (global_State *g, TValue *tv)
| lgr BASE, RB // Restore BASE.
| j <1
break;
#undef TV2MARKOFS
case BC_USETS:
| stg r0, 0(r0)
| stg r0, 0(r0)