* [Patch, fortran] PR87127 - External function not recognised from within an associate block
@ 2023-03-19 12:04 Paul Richard Thomas
0 siblings, 0 replies; 5+ messages in thread
From: Paul Richard Thomas @ 2023-03-19 12:04 UTC (permalink / raw)
To: fortran, gcc-patches
[-- Attachment #1.1: Type: text/plain, Size: 961 bytes --]
Hi All,
I committed this to 8-branch on 2019-04-24 but not to 9-branch. I have no
record of why I did this.
The patch now requires an additional line,
&& sym->ns->proc_name->attr.proc != PROC_MODULE
to prevent the error message in pr88376.f90 from changing to the less
helpful
Error: Specification function ‘n’ at (1) must be PURE
I propose to commit to mainline and backport to 12-branch unless there are
objections in the next 24 hours.
Cheers
Paul
Fortran: Recognise external function from within an associate block
that has not been declared as external [PR87127]
2023-03-19 Paul Thomas <pault@gcc.gnu.org>
gcc/fortran
PR fortran/87127
* resolve.cc (check_host_association): If an external function
is typed but not declared explicitly to be external, change the
old symbol from a variable to an external function.
gcc/testsuite/
PR fortran/87127
* gfortran.dg/external_procedures_4.f90: New test.
[-- Attachment #2: submit.diff --]
[-- Type: text/x-patch, Size: 2167 bytes --]
diff --git a/gcc/fortran/resolve.cc b/gcc/fortran/resolve.cc
index ba603b4c407..a947f908ece 100644
--- a/gcc/fortran/resolve.cc
+++ b/gcc/fortran/resolve.cc
@@ -6079,11 +6079,14 @@ resolve_procedure:
/* Checks to see that the correct symbol has been host associated.
- The only situation where this arises is that in which a twice
- contained function is parsed after the host association is made.
- Therefore, on detecting this, change the symbol in the expression
- and convert the array reference into an actual arglist if the old
- symbol is a variable. */
+ The only situations where this arises are:
+ (i) That in which a twice contained function is parsed after
+ the host association is made. On detecting this, change
+ the symbol in the expression and convert the array reference
+ into an actual arglist if the old symbol is a variable; or
+ (ii) That in which an external function is typed but not declared
+ explcitly to be external. Here, the old symbol is changed
+ from a variable to an external function. */
static bool
check_host_association (gfc_expr *e)
{
@@ -6185,6 +6188,27 @@ check_host_association (gfc_expr *e)
gfc_resolve_expr (e);
sym->refs++;
}
+ /* This case corresponds to a call, from a block or a contained
+ procedure, to an external function, which has not been declared
+ as being external in the main program but has been typed. */
+ else if (sym && old_sym != sym
+ && !e->ref
+ && sym->ts.type == BT_UNKNOWN
+ && old_sym->ts.type != BT_UNKNOWN
+ && sym->attr.flavor == FL_PROCEDURE
+ && old_sym->attr.flavor == FL_VARIABLE
+ && sym->ns->parent == old_sym->ns
+ && sym->ns->proc_name
+ && sym->ns->proc_name->attr.proc != PROC_MODULE
+ && (sym->ns->proc_name->attr.flavor == FL_LABEL
+ || sym->ns->proc_name->attr.flavor == FL_PROCEDURE))
+ {
+ old_sym->attr.flavor = FL_PROCEDURE;
+ old_sym->attr.external = 1;
+ old_sym->attr.function = 1;
+ old_sym->result = old_sym;
+ gfc_resolve_expr (e);
+ }
}
/* This might have changed! */
return e->expr_type == EXPR_FUNCTION;
[-- Attachment #3: external_procedures_4.f90 --]
[-- Type: text/x-fortran, Size: 638 bytes --]
! { dg-do run }
!
! Test the fix for PR87127 in which the references to exfunc cause
! the error "exfunc at (1) is not a function".
!
! Contributed by Gerhard Steinmetz <gscfq@t-online.de>
!
function exfunc(i)
implicit none
integer :: exfunc,i
exfunc = 2*i
end function
! contents of test.f90
program test
implicit none
integer :: exfunc,i
integer,parameter :: array(2)=[6,7]
associate(i=>array(2)) ! Original bug
if (exfunc(i) .ne. 2*i) stop 1
end associate
i = 99
call foo
contains
subroutine foo() ! Comment #3
if (exfunc(i) .ne. 2*i) stop 2
end subroutine foo
end program
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Patch, fortran] PR87127 - External function not recognised from within an associate block
2019-03-31 12:12 Dominique d'Humières
@ 2019-03-31 14:36 ` Paul Richard Thomas
0 siblings, 0 replies; 5+ messages in thread
From: Paul Richard Thomas @ 2019-03-31 14:36 UTC (permalink / raw)
To: Dominique d'Humières; +Cc: gfortran, gcc-patches
Hi Dominique,
I discovered the same thing myself this morning. The patch was
developed on 8-branch because my working trunk had a hefty patch in an
intermediate state of development. I cleared it off,ready to do the
commit, and discovered the change on regtesting. I am trying to think
of a way in which to distinguish the two cases.
Thanks
Paul
On Sun, 31 Mar 2019 at 10:33, Dominique d'Humières <dominiq@lps.ens.fr> wrote:
>
> Hi Paul,
>
> With your patch the error for the test gfortran.dg/pr88376.f90 is changed from
>
> Error: 'n' at (1) is not a function
>
> to
>
> Error: Specification function 'n' at (1) must be PURE
>
> TIA
>
> Dominique
--
"If you can't explain it simply, you don't understand it well enough"
- Albert Einstein
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Patch, fortran] PR87127 - External function not recognised from within an associate block
@ 2019-03-31 12:12 Dominique d'Humières
2019-03-31 14:36 ` Paul Richard Thomas
0 siblings, 1 reply; 5+ messages in thread
From: Dominique d'Humières @ 2019-03-31 12:12 UTC (permalink / raw)
To: Paul Richard Thomas; +Cc: gfortran, gcc-patches
Hi Paul,
With your patch the error for the test gfortran.dg/pr88376.f90 is changed from
Error: 'n' at (1) is not a function
to
Error: Specification function 'n' at (1) must be PURE
TIA
Dominique
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Patch, fortran] PR87127 - External function not recognised from within an associate block
2019-03-30 12:57 Paul Richard Thomas
@ 2019-03-30 15:23 ` Thomas Koenig
0 siblings, 0 replies; 5+ messages in thread
From: Thomas Koenig @ 2019-03-30 15:23 UTC (permalink / raw)
To: Paul Richard Thomas, fortran, gcc-patches; +Cc: gscfq
Hi Paul,
> Bootstrapped and regtested on FC29/x86_64 - OK for trunk?
OK - looks obvious enough, and, IMO, is quite unlikely to cause
a regressions.
Thanks for the patch!
Regards
Thomas
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Patch, fortran] PR87127 - External function not recognised from within an associate block
@ 2019-03-30 12:57 Paul Richard Thomas
2019-03-30 15:23 ` Thomas Koenig
0 siblings, 1 reply; 5+ messages in thread
From: Paul Richard Thomas @ 2019-03-30 12:57 UTC (permalink / raw)
To: fortran, gcc-patches; +Cc: gscfq
[-- Attachment #1: Type: text/plain, Size: 596 bytes --]
This patch is pretty self-explanatory. I have checked that a sensible
errors are given if 'exfunc' in the testcase is referenced if it is a
variable.
Bootstrapped and regtested on FC29/x86_64 - OK for trunk?
Paul
2019-03-30 Paul Thomas <pault@gcc.gnu.org>
PR fortran/87127
* resolve.c (check_host_association): If an external function
is typed but not declared explicitly to be external, change the
old symbol from a variable to an external function.
2019-03-30 Paul Thomas <pault@gcc.gnu.org>
PR fortran/87127
* gfortran.dg/external_procedures_4.f90: New test.
[-- Attachment #2: submit.diff --]
[-- Type: text/x-patch, Size: 3374 bytes --]
Index: gcc/fortran/resolve.c
===================================================================
*** gcc/fortran/resolve.c (revision 269160)
--- gcc/fortran/resolve.c (working copy)
*************** resolve_procedure:
*** 5615,5625 ****
/* Checks to see that the correct symbol has been host associated.
! The only situation where this arises is that in which a twice
! contained function is parsed after the host association is made.
! Therefore, on detecting this, change the symbol in the expression
! and convert the array reference into an actual arglist if the old
! symbol is a variable. */
static bool
check_host_association (gfc_expr *e)
{
--- 5615,5628 ----
/* Checks to see that the correct symbol has been host associated.
! The only situations where this arises are:
! (i) That in which a twice contained function is parsed after
! the host association is made. On detecting this, change
! the symbol in the expression and convert the array reference
! into an actual arglist if the old symbol is a variable; or
! (ii) That in which an external function is typed but not declared
! explicitly to be external. Here, the old symbol is changed
! from a variable to an external function. */
static bool
check_host_association (gfc_expr *e)
{
*************** check_host_association (gfc_expr *e)
*** 5709,5714 ****
--- 5712,5737 ----
gfc_resolve_expr (e);
sym->refs++;
}
+ /* This case corresponds to a call, from a block or a contained
+ procedure, to an external function, which has not been declared
+ as being external in the main program but has been typed. */
+ else if (sym && old_sym != sym
+ && !e->ref
+ && sym->ts.type == BT_UNKNOWN
+ && old_sym->ts.type != BT_UNKNOWN
+ && sym->attr.flavor == FL_PROCEDURE
+ && old_sym->attr.flavor == FL_VARIABLE
+ && sym->ns->parent == old_sym->ns
+ && sym->ns->proc_name
+ && (sym->ns->proc_name->attr.flavor == FL_LABEL
+ || sym->ns->proc_name->attr.flavor == FL_PROCEDURE))
+ {
+ old_sym->attr.flavor = FL_PROCEDURE;
+ old_sym->attr.external = 1;
+ old_sym->attr.function = 1;
+ old_sym->result = old_sym;
+ gfc_resolve_expr (e);
+ }
}
/* This might have changed! */
return e->expr_type == EXPR_FUNCTION;
Index: gcc/testsuite/gfortran.dg/external_procedures_4.f90
===================================================================
*** gcc/testsuite/gfortran.dg/external_procedures_4.f90 (nonexistent)
--- gcc/testsuite/gfortran.dg/external_procedures_4.f90 (working copy)
***************
*** 0 ****
--- 1,28 ----
+ ! { dg-do run }
+ !
+ ! Test the fix for PR87127 in which the references to exfunc cause
+ ! the error "‘exfunc’ at (1) is not a function".
+ !
+ ! Contributed by Gerhard Steinmetz <gscfq@t-online.de>
+ !
+ function exfunc(i)
+ implicit none
+ integer :: exfunc,i
+ exfunc = 2*i
+ end function
+
+ ! contents of test.f90
+ program test
+ implicit none
+ integer :: exfunc,i
+ integer,parameter :: array(2)=[6,7]
+ associate(i=>array(2)) ! Original bug
+ if (exfunc(i) .ne. 2*i) stop 1
+ end associate
+ i = 99
+ call foo
+ contains
+ subroutine foo() ! Comment #3
+ if (exfunc(i) .ne. 2*i) stop 2
+ end subroutine foo
+ end program
^ permalink raw reply [flat|nested] 5+ messages in thread
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