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conversion from closed array to slice

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R=r
OCL=22236
CL=22236
This commit is contained in:
Ken Thompson 2009-01-07 15:26:11 -08:00
parent a3ddf4cfd1
commit 3f135be389
1 changed files with 30 additions and 51 deletions
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81
src/cmd/gc/walk.c
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@ -594,6 +594,14 @@ loop:
if(issarray(t) && isdarray(l->type))
goto ret;
// convert static array to dynamic array
if(isdarray(t) && issarray(l->type)) {
if(eqtype(t->type->type, l->type->type->type, 0)) {
indir(n, arrayop(n, Erv));
goto ret;
}
}
// interface and structure
et = isandss(n->type, l);
if(et != Inone) {
@ -2663,6 +2671,28 @@ arrayop(Node *n, int top)
default:
fatal("darrayop: unknown op %O", n->op);
case OCONV:
// arrays2d(old *any, nel int) (ary []any)
t = fixarray(n->left->type);
tl = fixarray(n->type);
if(t == T || tl == T)
break;
a = nodintconst(t->bound); // nel
a = nod(OCONV, a, N);
a->type = types[TINT];
r = a;
a = nod(OADDR, n->left, N); // old
r = list(a, r);
on = syslook("arrays2d", 1);
argtype(on, t); // any-1
argtype(on, tl->type); // any-2
r = nod(OCALL, on, r);
walktype(r, top);
break;
case OAS:
// arrays2d(old *any, nel int) (ary []any)
t = fixarray(n->right->type);
@ -3499,57 +3529,6 @@ loop:
goto loop;
}
//Node*
//oldarraylit(Node *n)
//{
// Iter saver;
// Type *t;
// Node *var, *r, *a;
// int idx;
//
// t = n->type;
// if(t->etype != TARRAY)
// fatal("arraylit: not array");
//
// if(t->bound < 0) {
// // make a shallow copy
// t = typ(0);
// *t = *n->type;
// n->type = t;
//
// // make it a closed array
// r = listfirst(&saver, &n->left);
// if(r != N && r->op == OEMPTY)
// r = N;
// for(idx=0; r!=N; idx++)
// r = listnext(&saver);
// t->bound = idx;
// }
//
// var = nod(OXXX, N, N);
// tempname(var, t);
//
// idx = 0;
// r = listfirst(&saver, &n->left);
// if(r != N && r->op == OEMPTY)
// r = N;
//
//loop:
// if(r == N)
// return var;
//
// // build list of var[c] = expr
//
// a = nodintconst(idx);
// a = nod(OINDEX, var, a);
// a = nod(OAS, a, r);
// addtop = list(addtop, a);
// idx++;
//
// r = listnext(&saver);
// goto loop;
//}
Node*
arraylit(Node *n)
{