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gc: allow implicit conversion of *[10]int -> []int

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when used as arg to copy.

R=ken2
https://golang.org/cl/157071
This commit is contained in:
Russ Cox 2009-11-18 14:26:28 -08:00
parent 91cf0af181
commit 9be56adf3c
1 changed files with 26 additions and 2 deletions
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28
src/cmd/gc/typecheck.c
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@ -32,6 +32,7 @@ static void checklvalue(Node*, char*);
static void checkassign(Node*);
static void checkassignlist(NodeList*);
static int islvalue(Node*);
static void toslice(Node**);
void
typechecklist(NodeList *l, int top)
@ -777,12 +778,16 @@ reswitch:
n->type = types[TINT];
typecheck(&n->left, Erv);
typecheck(&n->right, Erv);
if(n->left->type == T || n->right->type == T)
goto error;
toslice(&n->left);
toslice(&n->right);
if(!isslice(n->left->type) || !isslice(n->right->type)) {
yyerror("arguments to copy must be slices");
yyerror("arguments to copy must be slices or array pointers");
goto error;
}
if(!eqtype(n->left->type, n->right->type)) {
yyerror("arguments to copy must be slices of the same type");
yyerror("arguments to copy must have the same type element type");
goto error;
}
goto ret;
@ -1120,6 +1125,25 @@ implicitstar(Node **nn)
*nn = n;
}
static void
toslice(Node **nn)
{
Node *n;
Type *t;
n = *nn;
if(n->type == T)
return;
if(isptr[n->type->etype] && isfixedarray(n->type->type)) {
// convert to slice
t = typ(TARRAY);
t->bound = -1;
t->type = n->type->type->type;
n = typecheckconv(nil, n, t, 0, "conversion of array pointer to slice");
*nn = n;
}
}
static int
onearg(Node *n)
{