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Kill any aliases when assigning to an aliased def.

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Temps aren't supported yet :P

The alias defs themselves aren't killed (still want any assignments to
occur) but rather, their nodes are. Also, edges to the alias defs' nodes
are added to the assigning node. Fixes structlive.r :)
This commit is contained in:
Bill Currie 2012-12-13 14:43:43 +09:00
parent 2dc60d4f9a
commit decc3845c5
1 changed files with 30 additions and 0 deletions
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30
tools/qfcc/source/dags.c
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@ -405,6 +405,35 @@ op_is_identifier (operand_t *op)
return 1;
}
static int
dag_kill_aliases_visit (def_t *def, void *_node)
{
dagnode_t *node = (dagnode_t *) _node;
daglabel_t *label;
label = def->daglabel;
if (label && label->dagnode) {
set_add (node->edges, label->dagnode->number);
set_remove (node->edges, node->number);
label->dagnode->killed = 1;
}
return 0;
}
static void
dag_kill_aliases (daglabel_t *l)
{
operand_t *op = l->op;
if (op->op_type == op_temp) {
} else if (op->op_type == op_def) {
if (op->o.def->alias || op->o.def->alias_defs)
def_visit_all (op->o.def, 1, dag_kill_aliases_visit, l->dagnode);
} else {
internal_error (0, "rvalue assignment?");
}
}
static void
dagnode_attach_label (dagnode_t *n, daglabel_t *l)
{
@ -423,6 +452,7 @@ dagnode_attach_label (dagnode_t *n, daglabel_t *l)
l->live = 0; // remove live forcing on assignment
l->dagnode = n;
set_add (n->identifiers, l->number);
dag_kill_aliases (l);
}
static int