Hi!
The gimple_parm_array_size function comment talks about pointe parameters
but doesn't actually verify it, it checks whether an attribute is present
on the function and then just uses TREE_TYPE (TREE_TYPE (var)) which
assumes a pointer type (or in theory could work for ARRAY_TYPE but
c-family languages which only have that attribute will never have ARRAY_TYPE
parameters; and for VECTOR_TYPE/COMPLEX_TYPE it would mean something quite
different).
So, this patch punts early if var doesn't have pointer/reference type.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2022-05-19 Jakub Jelinek <ja...@redhat.com>
PR c/105635
* poiinter-query.cc (gimple_parm_array_size): Return NULL if var
doesn't have pointer or reference type.
* gcc.dg/pr105635.c: New test.
--- gcc/pointer-query.cc.jj 2022-05-13 09:34:23.996147311 +0200
+++ gcc/pointer-query.cc 2022-05-18 12:12:21.398849571 +0200
@@ -555,7 +555,7 @@ gimple_parm_array_size (tree ptr, wide_i
from the current function declaratation (e.g., attribute access or
related). */
tree var = SSA_NAME_VAR (ptr);
- if (TREE_CODE (var) != PARM_DECL)
+ if (TREE_CODE (var) != PARM_DECL || !POINTER_TYPE_P (TREE_TYPE (var)))
return NULL_TREE;
const unsigned prec = TYPE_PRECISION (sizetype);
--- gcc/testsuite/gcc.dg/pr105635.c.jj 2022-05-18 12:23:56.868371600 +0200
+++ gcc/testsuite/gcc.dg/pr105635.c 2022-05-18 12:23:41.728577929 +0200
@@ -0,0 +1,11 @@
+/* PR c/105635 */
+/* { dg-do compile } */
+/* { dg-options "-Wall" } */
+
+void foo (int, int[*]); /* { dg-message "previous declaration of 'foo'
with type" } */
+
+foo (int x, int y) /* { dg-warning "return type defaults to 'int'" } */
+{ /* { dg-warning "conflicting types for 'foo'" "" {
target *-*-* } .-1 } */
+ /* { dg-message "declared here" "" { target *-*-* } .-2
} */
+ return (x >= 0) != (y < 0); /* { dg-warning "'return' with a value, in
function returning void" } */
+}
Jakub
