[PATCH, committed] Fortran: error recovery on invalid ARRAY argument to FINDLOC [PR106986]

[PATCH, committed] Fortran: error recovery on invalid ARRAY argument to FINDLOC [PR106986]

[Harald Anlauf]

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Dear all,

we ICE'd in the simplification of FINDLOC when the passed
ARRAY argument had an invalid declaration.  The reason was
a reference to array->shape which was NULL.

Obvious solution: then just don't attempt to simplify.

Regtested on x86_64-pc-linux-gnu and pushed to mainline as

https://gcc.gnu.org/g:5976fbf9d5dd9542fcb82eebb2185886fd52d000

The PR is marked as a 10/11/12/13 regression, thus I plan to
backport.

Thanks,
Harald


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From 5976fbf9d5dd9542fcb82eebb2185886fd52d000 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Tue, 20 Sep 2022 22:41:48 +0200
Subject: [PATCH] Fortran: error recovery on invalid ARRAY argument to FINDLOC
 [PR106986]

gcc/fortran/ChangeLog:

	PR fortran/106986
	* simplify.cc (gfc_simplify_findloc): Do not try to simplify
	intrinsic FINDLOC when the ARRAY argument has a NULL shape.

gcc/testsuite/ChangeLog:

	PR fortran/106986
	* gfortran.dg/pr106986.f90: New test.
---
 gcc/fortran/simplify.cc                | 1 +
 gcc/testsuite/gfortran.dg/pr106986.f90 | 8 ++++++++
 2 files changed, 9 insertions(+)
 create mode 100644 gcc/testsuite/gfortran.dg/pr106986.f90

diff --git a/gcc/fortran/simplify.cc b/gcc/fortran/simplify.cc
index 140c17721a7..c0fbd0ed7c2 100644
--- a/gcc/fortran/simplify.cc
+++ b/gcc/fortran/simplify.cc
@@ -5895,6 +5895,7 @@ gfc_simplify_findloc (gfc_expr *array, gfc_expr *value, gfc_expr *dim,
   bool back_val = false;

   if (!is_constant_array_expr (array)
+      || array->shape == NULL
       || !gfc_is_constant_expr (dim))
     return NULL;

diff --git a/gcc/testsuite/gfortran.dg/pr106986.f90 b/gcc/testsuite/gfortran.dg/pr106986.f90
new file mode 100644
index 00000000000..a309b25d181
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr106986.f90
@@ -0,0 +1,8 @@
+! { dg-do compile }
+! PR fortran/106986 - ICE in simplify_findloc_nodim
+! Contributed by G.Steinmetz
+
+program p
+  integer, parameter :: a(:) = [1] ! { dg-error "deferred shape" }
+  print *, findloc (a, 1)
+end
--
2.35.3