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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
* static initialization
*/
#include "go.h"
static void
init1(Node *n, NodeList **out)
{
NodeList *l;
if(n == N)
return;
init1(n->left, out);
init1(n->right, out);
for(l=n->list; l; l=l->next)
init1(l->n, out);
if(n->op != ONAME)
return;
switch(n->class) {
case PEXTERN:
case PFUNC:
break;
default:
return;
}
if(n->initorder == 1)
return;
if(n->initorder == 2)
fatal("init loop");
// make sure that everything n depends on is initialized.
// n->defn is an assignment to n
n->initorder = 2;
if(n->defn != N) {
switch(n->defn->op) {
default:
goto bad;
case ODCLFUNC:
for(l=n->defn->nbody; l; l=l->next)
init1(l->n, out);
break;
case OAS:
if(n->defn->left != n)
goto bad;
init1(n->defn->right, out);
if(debug['j'])
print("%S\n", n->sym);
*out = list(*out, n->defn);
break;
}
}
n->initorder = 1;
return;
bad:
dump("defn", n->defn);
fatal("bad defn");
}
static void
initreorder(NodeList *l, NodeList **out)
{
Node *n;
for(; l; l=l->next) {
n = l->n;
switch(n->op) {
case ODCLFUNC:
case ODCLCONST:
case ODCLTYPE:
continue;
}
initreorder(n->ninit, out);
n->ninit = nil;
init1(n, out);
}
}
NodeList*
initfix(NodeList *l)
{
NodeList *lout;
lout = nil;
initreorder(l, &lout);
return lout;
}
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