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gc: walk pointer in range on slice/array

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R=ken2
https://golang.org/cl/166071
This commit is contained in:
Russ Cox 2009-12-04 20:40:21 -08:00
parent 7c4aeec868
commit 6f14cada11
1 changed files with 21 additions and 4 deletions
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25
src/cmd/gc/range.c
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@ -90,6 +90,7 @@ walkrange(Node *n)
{
Node *ohv1, *hv1, *hv2; // hidden (old) val 1, 2
Node *ha, *hit; // hidden aggregate, iterator
Node *hn, *hp; // hidden len, pointer
Node *a, *v1, *v2; // not hidden aggregate, val 1, 2
Node *fn, *tmp;
NodeList *body, *init;
@ -122,16 +123,32 @@ walkrange(Node *n)
case TARRAY:
hv1 = nod(OXXX, N, n);
tempname(hv1, types[TINT]);
hn = nod(OXXX, N, N);
tempname(hn, types[TINT]);
hp = nil;
init = list(init, nod(OAS, hv1, N));
n->ntest = nod(OLT, hv1, nod(OLEN, ha, N));
init = list(init, nod(OAS, hn, nod(OLEN, ha, N)));
if(v2) {
hp = nod(OXXX, N, N);
tempname(hp, ptrto(a->type->type));
tmp = nod(OINDEX, ha, nodintconst(0));
tmp->etype = 1; // no bounds check
init = list(init, nod(OAS, hp, nod(OADDR, tmp, N)));
}
n->ntest = nod(OLT, hv1, hn);
n->nincr = nod(OASOP, hv1, nodintconst(1));
n->nincr->etype = OADD;
body = list1(nod(OAS, v1, hv1));
if(v2) {
tmp = nod(OINDEX, ha, hv1);
tmp->etype = 1; // no bounds check
body = list(body, nod(OAS, v2, tmp));
body = list(body, nod(OAS, v2, nod(OIND, hp, N)));
tmp = nod(OADD, hp, nodintconst(t->type->width));
tmp->type = hp->type;
tmp->typecheck = 1;
tmp->right->type = types[tptr];
tmp->right->typecheck = 1;
body = list(body, nod(OAS, hp, tmp));
}
break;