Hi Steve,
Am 12.12.22 um 00:52 schrieb Steve Kargl via Gcc-patches:
On Sun, Dec 11, 2022 at 11:33:43PM +0100, Harald Anlauf via Fortran wrote:
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?
OK with minor nit.
+ /* 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");
"assumed size" should likely be "assumed-size"
good point, I've fixed that.
I was a bit unhappy with the previously submitted patch,
as it tried to match ':' twice and gave an unfortunate locus
in the error message. I now chose to combine the adjacent
matches and to remember a more suitable locus for use with
the emitted error, see attached updated patch.
Committed as r13-4623-gcf5327b89ab610.
Thanks,
Harald
+ return AS_UNKNOWN;
+ }
+
From cf5327b89ab610649c5faab78ea7907bb74b103c 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 the 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 | 19 ++++++++++++++++---
gcc/testsuite/gfortran.dg/pr102180.f90 | 19 +++++++++++++++++++
2 files changed, 35 insertions(+), 3 deletions(-)
create mode 100644 gcc/testsuite/gfortran.dg/pr102180.f90
diff --git a/gcc/fortran/array.cc b/gcc/fortran/array.cc
index bbdb5b392fc..10d9e0c5354 100644
--- a/gcc/fortran/array.cc
+++ b/gcc/fortran/array.cc
@@ -489,7 +489,20 @@ match_array_element_spec (gfc_array_spec *as)
}
if (gfc_match_char (':') == MATCH_YES)
- return AS_DEFERRED;
+ {
+ locus old_loc = gfc_current_locus;
+ if (gfc_match_char ('*') == MATCH_YES)
+ {
+ /* F2018:R821: "assumed-implied-spec is [ lower-bound : ] *". */
+ gfc_error ("A lower bound must precede colon in "
+ "assumed-size array specification at %L", &old_loc);
+ return AS_UNKNOWN;
+ }
+ else
+ {
+ return AS_DEFERRED;
+ }
+ }
m = gfc_match_expr (upper);
if (m == MATCH_NO)
@@ -591,6 +604,8 @@ 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 +615,6 @@ 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
