qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-09-29 11:34:32 -06:00
Code Releases Activity

fixed op=, ++ and -- on maps (bug060)

Browse Source 
R=r
DELTA=22  (21 added, 0 deleted, 1 changed)
OCL=14049
CL=14049
This commit is contained in:
Ken Thompson 2008-08-10 16:49:01 -07:00
parent 258c817a1b
commit 5649c23c8c
1 changed files with 22 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
src/cmd/gc/walk.c
View File

@ -458,7 +458,13 @@ loop:
if(top != Etop)
goto nottop;
walktype(n->left, Elv);
goto com;
l = n->left;
if(l->op != OINDEX)
goto com;
if(!isptrto(l->left->type, TMAP))
goto com;
*n = *mapop(n, top);
goto loop;
case OLSH:
case ORSH:
@ -1875,6 +1881,21 @@ mapop(Node *n, int top)
r = n;
break;
case OASOP:
// rewrite map[index] op= right
// into tmpi := index; map[tmpi] = map[tmpi] op right
t = n->left->left->type->type;
a = nod(OXXX, N, N);
tempname(a, t->down); // tmpi
r = nod(OAS, a, n->left->right); // tmpi := index
n->left->right = a; // m[tmpi]
a = nod(OXXX, N, N);
*a = *n->left; // copy of map[tmpi]
a = nod(n->etype, a, n->right); // m[tmpi] op right
a = nod(OAS, n->left, a); // map[tmpi] = map[tmpi] op right
r = nod(OLIST, r, a);
}
return r;