Hi Tobias,
Thanks for your review.
Here is a revised patch resulting from your comments.
The only issue that I could not easily fix is the following code
triggering an ICE:
```
!$OMP begin metadirective &
!$OMP when ( user = { condition ( UseDevice ) } &
!$OMP : nothing ) &
!$OMP default ( parallel )
block
call foo()
end block
call bar() <--- ICE
!$omp end metadirective
```
I filed a PR on Bugzilla:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107067
Is it OK for you?
--
PA
From 03476214bda71c6581b7978cf9fd5b701896a052 Mon Sep 17 00:00:00 2001
From: Paul-Antoine Arras <p...@codesourcery.com>
Date: Wed, 21 Sep 2022 15:52:56 +0000
Subject: [PATCH] OpenMP: Fix ICE with OMP metadirectives
Problem: ending an OpenMP metadirective block with an OMP end statement
results in an internal compiler error.
Solution: reject invalid end statements and issue a proper diagnostic.
This revision also fixes a couple of minor metadirective issues and adds
related test cases.
gcc/fortran/ChangeLog:
* parse.cc (gfc_ascii_statement): Missing $ in !$OMP END METADIRECTIVE.
(parse_omp_structured_block): Fix handling of OMP end metadirective.
(parse_omp_metadirective_body): Reject OMP end statements
at the end of an OMP metadirective.
gcc/testsuite/ChangeLog:
* gfortran.dg/gomp/metadirective-1.f90: Match !$OMP END METADIRECTIVE.
* gfortran.dg/gomp/metadirective-10.f90: New test.
* gfortran.dg/gomp/metadirective-11.f90: New xfail test.
* gfortran.dg/gomp/metadirective-9.f90: New test.
---
gcc/fortran/ChangeLog.omp | 7 ++++
gcc/fortran/parse.cc | 32 ++++++++++-----
gcc/testsuite/ChangeLog.omp | 7 ++++
.../gfortran.dg/gomp/metadirective-1.f90 | 2 +-
.../gfortran.dg/gomp/metadirective-10.f90 | 40 +++++++++++++++++++
.../gfortran.dg/gomp/metadirective-11.f90 | 33 +++++++++++++++
.../gfortran.dg/gomp/metadirective-9.f90 | 30 ++++++++++++++
7 files changed, 141 insertions(+), 10 deletions(-)
create mode 100644 gcc/testsuite/gfortran.dg/gomp/metadirective-10.f90
create mode 100644 gcc/testsuite/gfortran.dg/gomp/metadirective-11.f90
create mode 100644 gcc/testsuite/gfortran.dg/gomp/metadirective-9.f90
diff --git gcc/fortran/ChangeLog.omp gcc/fortran/ChangeLog.omp
index 8c89cd5bd43..14f897e8fec 100644
--- gcc/fortran/ChangeLog.omp
+++ gcc/fortran/ChangeLog.omp
@@ -1,3 +1,10 @@
+2022-09-21 Paul-Antoine Arras <p...@codesourcery.com>
+
+ * parse.cc (gfc_ascii_statement): Missing $ in !$OMP END METADIRECTIVE.
+ (parse_omp_structured_block): Fix handling of OMP end metadirective.
+ (parse_omp_metadirective_body): Reject OMP end statements
+ at the end of an OMP metadirective.
+
2022-09-09 Tobias Burnus <tob...@codesourcery.com>
Backport from mainline:
diff --git gcc/fortran/parse.cc gcc/fortran/parse.cc
index b35d76a4f6b..fc88111a7ad 100644
--- gcc/fortran/parse.cc
+++ gcc/fortran/parse.cc
@@ -2517,7 +2517,7 @@ gfc_ascii_statement (gfc_statement st)
p = "!$OMP END MASTER TASKLOOP SIMD";
break;
case ST_OMP_END_METADIRECTIVE:
- p = "!OMP END METADIRECTIVE";
+ p = "!$OMP END METADIRECTIVE";
break;
case ST_OMP_END_ORDERED:
p = "!$OMP END ORDERED";
@@ -5643,9 +5643,15 @@ parse_omp_structured_block (gfc_statement omp_st, bool
workshare_stmts_only)
np->block = NULL;
omp_end_st = gfc_omp_end_stmt (omp_st, false, true);
- if (omp_st == ST_NONE)
+ if (omp_end_st == ST_NONE)
gcc_unreachable ();
+ /* If handling a metadirective variant, treat 'omp end metadirective'
+ as the expected end statement for the current construct. */
+ if (gfc_state_stack->previous != NULL
+ && gfc_state_stack->previous->state == COMP_OMP_BEGIN_METADIRECTIVE)
+ omp_end_st = ST_OMP_END_METADIRECTIVE;
+
bool block_construct = false;
gfc_namespace *my_ns = NULL;
gfc_namespace *my_parent = NULL;
@@ -5744,13 +5750,6 @@ parse_omp_structured_block (gfc_statement omp_st, bool
workshare_stmts_only)
else
st = parse_executable (st);
- /* If handling a metadirective variant, treat 'omp end metadirective'
- as the expected end statement for the current construct. */
- if (st == ST_OMP_END_METADIRECTIVE
- && gfc_state_stack->previous != NULL
- && gfc_state_stack->previous->state == COMP_OMP_BEGIN_METADIRECTIVE)
- st = omp_end_st;
-
if (st == ST_NONE)
unexpected_eof ();
else if (st == ST_OMP_SECTION
@@ -5863,6 +5862,21 @@ parse_omp_metadirective_body (gfc_statement omp_st)
break;
}
+ if (gfc_state_stack->state == COMP_OMP_METADIRECTIVE
+ && startswith (gfc_ascii_statement (st), "!$OMP END "))
+ {
+ for (gfc_state_data *p = gfc_state_stack; p; p = p->previous)
+ if (p->state == COMP_OMP_STRUCTURED_BLOCK
+ || p->state == COMP_OMP_BEGIN_METADIRECTIVE)
+ goto finish;
+ gfc_error (
+ "Unexpected %s statement in an OMP METADIRECTIVE block at %C",
+ gfc_ascii_statement (st));
+ reject_statement ();
+ st = next_statement ();
+ }
+ finish:
+
gfc_in_metadirective_body = old_in_metadirective_body;
if (gfc_state_stack->head)
diff --git gcc/testsuite/ChangeLog.omp gcc/testsuite/ChangeLog.omp
index e0c8c138620..f0d1b1a388b 100644
--- gcc/testsuite/ChangeLog.omp
+++ gcc/testsuite/ChangeLog.omp
@@ -1,3 +1,10 @@
+2022-09-21 Paul-Antoine Arras <p...@codesourcery.com>
+
+ * gfortran.dg/gomp/metadirective-1.f90: Match !$OMP END METADIRECTIVE.
+ * gfortran.dg/gomp/metadirective-10.f90: New test.
+ * gfortran.dg/gomp/metadirective-11.f90: New test.
+ * gfortran.dg/gomp/metadirective-9.f90: New test.
+
2022-09-09 Paul-Antoine Arras <p...@codesourcery.com>
Backport from mainline:
diff --git gcc/testsuite/gfortran.dg/gomp/metadirective-1.f90
gcc/testsuite/gfortran.dg/gomp/metadirective-1.f90
index aa439fc855e..ca62aecad89 100644
--- gcc/testsuite/gfortran.dg/gomp/metadirective-1.f90
+++ gcc/testsuite/gfortran.dg/gomp/metadirective-1.f90
@@ -37,5 +37,5 @@ program main
do i = 1, N
c(i) = a(i) * b(i)
end do
- !$omp end metadirective ! { dg-error "Unexpected !OMP END METADIRECTIVE
statement at .1." }
+ !$omp end metadirective ! { dg-error "Unexpected !.OMP END METADIRECTIVE
statement at .1." }
end program
diff --git gcc/testsuite/gfortran.dg/gomp/metadirective-10.f90
gcc/testsuite/gfortran.dg/gomp/metadirective-10.f90
new file mode 100644
index 00000000000..5dad5d29eb6
--- /dev/null
+++ gcc/testsuite/gfortran.dg/gomp/metadirective-10.f90
@@ -0,0 +1,40 @@
+! { dg-do compile }
+
+program metadirectives
+ implicit none
+ logical :: UseDevice
+
+ !$OMP metadirective &
+ !$OMP when ( user = { condition ( UseDevice ) } &
+ !$OMP : parallel ) &
+ !$OMP default ( parallel )
+ block
+ call bar()
+ end block
+
+ !$OMP metadirective &
+ !$OMP when ( user = { condition ( UseDevice ) } &
+ !$OMP : parallel ) &
+ !$OMP default ( parallel )
+ call bar()
+ !$omp end parallel ! Accepted, because all cases have 'parallel'
+
+ !$OMP begin metadirective &
+ !$OMP when ( user = { condition ( UseDevice ) } &
+ !$OMP : nothing ) &
+ !$OMP default ( parallel )
+ call bar()
+ block
+ call foo()
+ end block
+ !$OMP end metadirective
+
+ !$OMP begin metadirective &
+ !$OMP when ( user = { condition ( UseDevice ) } &
+ !$OMP : parallel ) &
+ !$OMP default ( parallel )
+ call bar()
+ !$omp end parallel ! { dg-error "Unexpected !.OMP END PARALLEL statement
at .1." }
+end program ! { dg-error "Unexpected END statement at .1." }
+
+! { dg-error "Unexpected end of file" "" { target *-*-* } 0 }
diff --git gcc/testsuite/gfortran.dg/gomp/metadirective-11.f90
gcc/testsuite/gfortran.dg/gomp/metadirective-11.f90
new file mode 100644
index 00000000000..e7de70e6259
--- /dev/null
+++ gcc/testsuite/gfortran.dg/gomp/metadirective-11.f90
@@ -0,0 +1,33 @@
+! { dg-do compile }
+! { dg-ice "Statements following a block in a metadirective" }
+! PR fortran/107067
+
+program metadirectives
+ implicit none
+ logical :: UseDevice
+
+ !$OMP begin metadirective &
+ !$OMP when ( user = { condition ( UseDevice ) } &
+ !$OMP : nothing ) &
+ !$OMP default ( parallel )
+ block
+ call foo()
+ end block
+ call bar() ! FIXME/XFAIL ICE in parse_omp_metadirective_body()
+ !$omp end metadirective
+
+
+ !$OMP begin metadirective &
+ !$OMP when ( user = { condition ( UseDevice ) } &
+ !$OMP : nothing ) &
+ !$OMP default ( parallel )
+ block
+ call bar()
+ end block
+ block ! FIXME/XFAIL ICE in parse_omp_metadirective_body()
+ call foo()
+ end block
+ !$omp end metadirective
+end program
+
+
diff --git gcc/testsuite/gfortran.dg/gomp/metadirective-9.f90
gcc/testsuite/gfortran.dg/gomp/metadirective-9.f90
new file mode 100644
index 00000000000..e6ab3fc0a65
--- /dev/null
+++ gcc/testsuite/gfortran.dg/gomp/metadirective-9.f90
@@ -0,0 +1,30 @@
+! { dg-do compile }
+
+program OpenMP_Metadirective_WrongEnd_Test
+ implicit none
+
+ integer :: &
+ iaVS, iV, jV, kV
+ integer, dimension ( 3 ) :: &
+ lV, uV
+ logical :: &
+ UseDevice
+
+ !$OMP metadirective &
+ !$OMP when ( user = { condition ( UseDevice ) } &
+ !$OMP : target teams distribute parallel do simd collapse ( 3 ) &
+ !$OMP private ( iaVS ) ) &
+ !$OMP default ( parallel do simd collapse ( 3 ) private ( iaVS ) )
+ do kV = lV ( 3 ), uV ( 3 )
+ do jV = lV ( 2 ), uV ( 2 )
+ do iV = lV ( 1 ), uV ( 1 )
+
+
+ end do
+ end do
+ end do
+ !$OMP end target teams distribute parallel do simd ! { dg-error
"Unexpected !.OMP END TARGET TEAMS DISTRIBUTE PARALLEL DO SIMD statement in an
OMP METADIRECTIVE block at .1." }
+
+
+end program
+
--
2.31.1
