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Verify unallocated edge/BB flags are clear

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This adds verification that unused auto_{edge,bb}_flag are not
remaining set but correctly cleared by consumers.  The intent
is that those flags can be cheaply used on a smaller IL region
and thus afterwards clearing can be restricted to the same
small region as well.

2021-09-24  Richard Biener  <rguenther@suse.de>

	* cfghooks.c (verify_flow_info): Verify unallocated BB and
	edge flags are not set.
This commit is contained in:
Richard Biener 2021-09-24 10:13:45 +02:00
parent 204f56aa65
commit 710c6ab4ad
1 changed files with 13 additions and 0 deletions
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13
gcc/cfghooks.c
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@ -161,6 +161,12 @@ verify_flow_info (void)
err = 1;
}
if (bb->flags & ~cfun->cfg->bb_flags_allocated)
{
error ("verify_flow_info: unallocated flag set on BB %d", bb->index);
err = 1;
}
FOR_EACH_EDGE (e, ei, bb->succs)
{
if (last_visited [e->dest->index] == bb)
@ -202,6 +208,13 @@ verify_flow_info (void)
err = 1;
}
if (e->flags & ~cfun->cfg->edge_flags_allocated)
{
error ("verify_flow_info: unallocated edge flag set on %d -> %d",
e->src->index, e->dest->index);
err = 1;
}
edge_checksum[e->dest->index] += (size_t) e;
}
if (n_fallthru > 1)