On Mon, Dec 07, 2015 at 04:05:11PM +0000, Joseph Myers wrote:
> On Mon, 7 Dec 2015, Marek Polacek wrote:
>
> > + if (orig_qual_indirect != 0)
> > + orig_qual_type = TREE_TYPE (orig_qual_type);
> > + else
> > + orig_qual_indirect--;
>
> For optimal results for debug info, I think that should be == 0 (i.e.
> preserve orig_qual_type, which may be a typedef, if possible - if the
> parameter is an array of orig_qual_type), rather than != 0.
I'm confused now. If orig_qual_indirect != 0, it is indirect, right?
Earlier you said:
"if orig_qual_indirect is indirect, in that case you
may get better results from changing orig_qual_type without decrementing
orig_qual_indirect."
Isn't that something else than this version with == 0?
Anyway, here's the version with == 0. Thanks,
Bootstrapped/regtested on x86_64-linux, ok for trunk?
2015-12-07 Marek Polacek <pola...@redhat.com>
PR c/68668
* c-decl.c (grokdeclarator): If ORIG_QUAL_INDIRECT is indirect, use
TREE_TYPE of ORIG_QUAL_TYPE, otherwise decrement ORIG_QUAL_INDIRECT.
* gcc.dg/pr68668.c: New test.
diff --git gcc/c/c-decl.c gcc/c/c-decl.c
index 9ad8219..6a85514 100644
--- gcc/c/c-decl.c
+++ gcc/c/c-decl.c
@@ -6417,6 +6417,13 @@ grokdeclarator (const struct c_declarator *declarator,
{
/* Transfer const-ness of array into that of type pointed to. */
type = TREE_TYPE (type);
+ if (orig_qual_type != NULL_TREE)
+ {
+ if (orig_qual_indirect == 0)
+ orig_qual_type = TREE_TYPE (orig_qual_type);
+ else
+ orig_qual_indirect--;
+ }
if (type_quals)
type = c_build_qualified_type (type, type_quals, orig_qual_type,
orig_qual_indirect);
diff --git gcc/testsuite/gcc.dg/pr68668.c gcc/testsuite/gcc.dg/pr68668.c
index e69de29..d013aa9 100644
--- gcc/testsuite/gcc.dg/pr68668.c
+++ gcc/testsuite/gcc.dg/pr68668.c
@@ -0,0 +1,53 @@
+/* PR c/68668 */
+/* { dg-do compile } */
+
+typedef const int T[];
+typedef const int U[1];
+
+int
+fn1 (T p)
+{
+ return p[0];
+}
+
+int
+fn2 (U p[2])
+{
+ return p[0][0];
+}
+
+int
+fn3 (U p[2][3])
+{
+ return p[0][0][0];
+}
+
+int
+fn4 (U *p)
+{
+ return p[0][0];
+}
+
+int
+fn5 (U (*p)[1])
+{
+ return (*p)[0][0];
+}
+
+int
+fn6 (U (*p)[1][2])
+{
+ return (*p)[0][0][0];
+}
+
+int
+fn7 (U **p)
+{
+ return p[0][0][0];
+}
+
+int
+fn8 (U (**p)[1])
+{
+ return (*p)[0][0][0];
+}
Marek
