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Fix ambiguous grammar for devicetree rule

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Commit 737b2df3, "overlay: Add syntactic sugar version of overlays"
introduced an empty rule for "devicetree" that created ambiguities in
the grammar and causes the following warning:

         BISON dtc-parser.tab.c
  dtc-parser.y: warning: 3 shift/reduce conflicts [-Wconflicts-sr]

Fix the grammar by explicitly testing for the condition the
new overlay grammar wants to use. This means duplicating a very small
amount of grammar processing code, but the alternative seems to be a
more invasive reorganization of the devicetree rule. Better to fix it
this way now and save the reorg for a separate patch.

Signed-off-by: Grant Likely <grant.likely@arm.com>
Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Grant Likely 2017-11-20 17:12:18 +00:00 • committed by David Gibson
parent fe667e382b
commit b260c4f610
3 changed files with 14 additions and 8 deletions
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17
dtc-parser.y
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@ -166,7 +166,17 @@ devicetree:
{
$$ = merge_nodes($1, $3);
}
| DT_REF nodedef
{
/*
* We rely on the rule being always:
* versioninfo plugindecl memreserves devicetree
* so $-1 is what we want (plugindecl)
*/
if (!($<flags>-1 & DTSF_PLUGIN))
ERROR(&@2, "Label or path %s not found", $1);
$$ = add_orphan_node(name_node(build_node(NULL, NULL), ""), $2, $1);
}
| devicetree DT_LABEL DT_REF nodedef
{
struct node *target = get_node_by_ref($1, $3);
@ -209,11 +219,6 @@ devicetree:
$$ = $1;
}
| /* empty */
{
/* build empty node */
$$ = name_node(build_node(NULL, NULL), "");
}
;
nodedef: