Dear all,
the attached patch improves checking of array specs in two ways:
- bad assumed size array spec
- a bad first array element spec may already trigger an error,
leading to a more consistent behavior
Regtested on x86_64-pc-linux-gnu. OK for mainline?
Thanks,
Harald
From 06c1d0a96544640c7b1485fe977337ef1572ac91 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anl...@gmx.de>
Date: Sun, 11 Dec 2022 23:24:03 +0100
Subject: [PATCH] Fortran: improve checking of assumed size array spec
[PR102180]
gcc/fortran/ChangeLog:
PR fortran/102180
* array.cc (match_array_element_spec): Add check for bad
assumed-implied-spec.
(gfc_match_array_spec): Reorder logic so that a first bad array
element spec may trigger an error.
gcc/testsuite/ChangeLog:
PR fortran/102180
* gfortran.dg/pr102180.f90: New test.
---
gcc/fortran/array.cc | 12 ++++++++++--
gcc/testsuite/gfortran.dg/pr102180.f90 | 19 +++++++++++++++++++
2 files changed, 29 insertions(+), 2 deletions(-)
create mode 100644 gcc/testsuite/gfortran.dg/pr102180.f90
diff --git a/gcc/fortran/array.cc b/gcc/fortran/array.cc
index bbdb5b392fc..9c1d55fa8cc 100644
--- a/gcc/fortran/array.cc
+++ b/gcc/fortran/array.cc
@@ -488,6 +488,14 @@ match_array_element_spec (gfc_array_spec *as)
return AS_ASSUMED_SIZE;
}
+ /* F2018:R821: "assumed-implied-spec is [ lower-bound : ] *". */
+ if (gfc_match (" : * ") == MATCH_YES)
+ {
+ gfc_error ("A lower bound must precede colon in "
+ "assumed size array specification at %C");
+ return AS_UNKNOWN;
+ }
+
if (gfc_match_char (':') == MATCH_YES)
return AS_DEFERRED;
@@ -591,6 +599,8 @@ gfc_match_array_spec (gfc_array_spec **asp, bool match_dim, bool match_codim)
{
as->rank++;
current_type = match_array_element_spec (as);
+ if (current_type == AS_UNKNOWN)
+ goto cleanup;
/* Note that current_type == AS_ASSUMED_SIZE for both assumed-size
and implied-shape specifications. If the rank is at least 2, we can
@@ -600,8 +610,6 @@ gfc_match_array_spec (gfc_array_spec **asp, bool match_dim, bool match_codim)
if (as->rank == 1)
{
- if (current_type == AS_UNKNOWN)
- goto cleanup;
as->type = current_type;
}
else
diff --git a/gcc/testsuite/gfortran.dg/pr102180.f90 b/gcc/testsuite/gfortran.dg/pr102180.f90
new file mode 100644
index 00000000000..cbf3e7299e7
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr102180.f90
@@ -0,0 +1,19 @@
+! { dg-do compile }
+! { dg-options "-fcoarray=lib" }
+! PR fortran/102180 - Improve checking of assumed size array spec
+
+subroutine s(x,y)
+ real :: x(0:*) ! legal
+ real :: y[0:*] ! legal
+end
+
+subroutine t(x,y)
+ real :: x(:*) ! { dg-error "A lower bound must precede colon" }
+ real :: y[:*] ! { dg-error "A lower bound must precede colon" }
+end
+
+subroutine u(x,y,z)
+ real :: x(2,*)
+ real :: y(2,2:*)
+ real :: z(2,:*) ! { dg-error "A lower bound must precede colon" }
+end
--
2.35.3
