[flang-commits] [flang] [openmp] [OpenMP] [Flang] Resolved Issue llvm#76121: Implemented Check for Unhandled Arguments in __kmpc_fork_call_if (PR #82221)
chandan singh via flang-commits
flang-commits at lists.llvm.org
Thu Apr 11 23:14:14 PDT 2024
https://github.com/chandankds updated https://github.com/llvm/llvm-project/pull/82221
>From 9b1ea42bd38b4ede10460bef569e80f30a73d115 Mon Sep 17 00:00:00 2001
From: chandan singh <chandankds at gmail.com>
Date: Mon, 19 Feb 2024 12:21:37 +0530
Subject: [PATCH 1/5] [OpenMP] [Flang] Fix Issue llvm#76121
Root cause: Segmentation fault is caused by null pointer dereference inside the __kmpc_fork_call_if function at https://github.com/llvm/llvm-project/blob/main/openmp/runtime/src/z_Linux_asm.S#L1186 . __kmpc_fork_call_if is missing case to handle argc=0 .
Fix: Added a check inside the __kmp_invoke_microtask function to handle the case when argc is 0.
---
openmp/runtime/src/z_Linux_asm.S | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/openmp/runtime/src/z_Linux_asm.S b/openmp/runtime/src/z_Linux_asm.S
index 14987c298fa5f9..b44d9fb316a05c 100644
--- a/openmp/runtime/src/z_Linux_asm.S
+++ b/openmp/runtime/src/z_Linux_asm.S
@@ -1150,6 +1150,9 @@ KMP_LABEL(kmp_invoke_pass_parms): // put 1st - 6th parms to pkfn in registers.
movq %rdi, %rbx // pkfn -> %rbx
leaq __gtid(%rbp), %rdi // >id -> %rdi (store 1st parm to pkfn)
leaq __tid(%rbp), %rsi // &tid -> %rsi (store 2nd parm to pkfn)
+ // Check if argc is 0
+ cmpq $0, %rax
+ je KMP_LABEL(kmp_no_args) // Jump ahead
movq %r8, %r11 // p_argv -> %r11
@@ -1195,6 +1198,7 @@ KMP_LABEL(kmp_1_exit):
cmovnsq (%r11), %rdx // p_argv[0] -> %rdx (store 3rd parm to pkfn)
#endif // KMP_MIC
+ KMP_LABEL(kmp_no_args):
call *%rbx // call (*pkfn)();
movq $1, %rax // move 1 into return register;
>From 4f4fae3f9d4e28602461c0ffe882d1ed84002e39 Mon Sep 17 00:00:00 2001
From: Singh <chasingh at amd.com>
Date: Sun, 3 Mar 2024 08:21:21 +0530
Subject: [PATCH 2/5] Create parallel_do_if_false.f90
---
flang/test/Runtime/parallel_do_if_false.f90 | 27 +++++++++++++++++++++
1 file changed, 27 insertions(+)
create mode 100644 flang/test/Runtime/parallel_do_if_false.f90
diff --git a/flang/test/Runtime/parallel_do_if_false.f90 b/flang/test/Runtime/parallel_do_if_false.f90
new file mode 100644
index 00000000000000..f15a697eb5868d
--- /dev/null
+++ b/flang/test/Runtime/parallel_do_if_false.f90
@@ -0,0 +1,27 @@
+!RUN: %flang %s -o %t -fopenmp && %t | FileCheck %s
+PROGRAM parallel_do_if
+
+ USE OMP_LIB
+
+ INTEGER :: I
+
+ INTEGER :: N = 0
+
+ INTEGER, PARAMETER :: NI = 1
+
+ !$OMP PARALLEL DO IF(.false.)
+
+ DO I = 1, NI
+
+ IF (omp_in_parallel() .EQV. .false.) THEN
+ !CHECK: PASS
+ PRINT *, "PASS"
+ ELSE
+ PRINT *, "FAIL"
+
+ END IF
+
+ END DO
+ !$OMP END PARALLEL DO
+
+END PROGRAM
>From 22f085cb718cbede39d1e3e05fafb22ceafb40b9 Mon Sep 17 00:00:00 2001
From: chandan singh <chandankds at gmail.com>
Date: Mon, 11 Mar 2024 11:13:33 +0530
Subject: [PATCH 3/5] Added test for issue llvm#76121
---
openmp/runtime/test/lit.site.cfg.in | 1 +
.../runtime/test/parallel}/parallel_do_if_false.f90 | 0
2 files changed, 1 insertion(+)
rename {flang/test/Runtime => openmp/runtime/test/parallel}/parallel_do_if_false.f90 (100%)
diff --git a/openmp/runtime/test/lit.site.cfg.in b/openmp/runtime/test/lit.site.cfg.in
index d6c259280619be..c6d623ebd072c3 100644
--- a/openmp/runtime/test/lit.site.cfg.in
+++ b/openmp/runtime/test/lit.site.cfg.in
@@ -2,6 +2,7 @@
config.test_c_compiler = "@OPENMP_TEST_C_COMPILER@"
config.test_cxx_compiler = "@OPENMP_TEST_CXX_COMPILER@"
+config.test_fortran_compiler="@OPENMP_TEST_Fortran_COMPILER@"
config.test_compiler_features = @OPENMP_TEST_COMPILER_FEATURES@
config.test_compiler_has_omp_h = @OPENMP_TEST_COMPILER_HAS_OMP_H@
config.test_filecheck = "@OPENMP_FILECHECK_EXECUTABLE@"
diff --git a/flang/test/Runtime/parallel_do_if_false.f90 b/openmp/runtime/test/parallel/parallel_do_if_false.f90
similarity index 100%
rename from flang/test/Runtime/parallel_do_if_false.f90
rename to openmp/runtime/test/parallel/parallel_do_if_false.f90
>From 2c4b38bb9669a446034eb60b4e5ba2b8565ba674 Mon Sep 17 00:00:00 2001
From: chandan singh <chandankds at gmail.com>
Date: Fri, 12 Apr 2024 11:26:05 +0530
Subject: [PATCH 4/5] Fix Issue llvm#76121
Added testcase
---
openmp/runtime/test/lit.site.cfg.in | 1 -
.../test/misc_bugs/omp__kmpc_fork_call_if.c | 24 +++++++++++++++++
.../test/parallel/parallel_do_if_false.f90 | 27 -------------------
3 files changed, 24 insertions(+), 28 deletions(-)
create mode 100644 openmp/runtime/test/misc_bugs/omp__kmpc_fork_call_if.c
delete mode 100644 openmp/runtime/test/parallel/parallel_do_if_false.f90
diff --git a/openmp/runtime/test/lit.site.cfg.in b/openmp/runtime/test/lit.site.cfg.in
index c6d623ebd072c3..d6c259280619be 100644
--- a/openmp/runtime/test/lit.site.cfg.in
+++ b/openmp/runtime/test/lit.site.cfg.in
@@ -2,7 +2,6 @@
config.test_c_compiler = "@OPENMP_TEST_C_COMPILER@"
config.test_cxx_compiler = "@OPENMP_TEST_CXX_COMPILER@"
-config.test_fortran_compiler="@OPENMP_TEST_Fortran_COMPILER@"
config.test_compiler_features = @OPENMP_TEST_COMPILER_FEATURES@
config.test_compiler_has_omp_h = @OPENMP_TEST_COMPILER_HAS_OMP_H@
config.test_filecheck = "@OPENMP_FILECHECK_EXECUTABLE@"
diff --git a/openmp/runtime/test/misc_bugs/omp__kmpc_fork_call_if.c b/openmp/runtime/test/misc_bugs/omp__kmpc_fork_call_if.c
new file mode 100644
index 00000000000000..de260385670b4b
--- /dev/null
+++ b/openmp/runtime/test/misc_bugs/omp__kmpc_fork_call_if.c
@@ -0,0 +1,24 @@
+// RUN: %libomp-compile -Wno-implicit-function-declaration && %t | FileCheck %s
+
+#include <stdio.h>
+#include <omp.h>
+
+
+// Microtask function for parallel region
+void microtask(int* global_tid, int* bound_tid) {
+// CHECK: PASS
+ if (omp_in_parallel()) {
+ printf("FAIL\n");
+ } else {
+ printf("PASS\n");
+ }
+}
+
+int main() {
+ // Condition for parallelization (false in this case)
+ int cond = 0;
+
+ // Call __kmpc_fork_call_if
+ __kmpc_fork_call_if(NULL, 0, microtask, cond, NULL);
+ return 0;
+}
\ No newline at end of file
diff --git a/openmp/runtime/test/parallel/parallel_do_if_false.f90 b/openmp/runtime/test/parallel/parallel_do_if_false.f90
deleted file mode 100644
index f15a697eb5868d..00000000000000
--- a/openmp/runtime/test/parallel/parallel_do_if_false.f90
+++ /dev/null
@@ -1,27 +0,0 @@
-!RUN: %flang %s -o %t -fopenmp && %t | FileCheck %s
-PROGRAM parallel_do_if
-
- USE OMP_LIB
-
- INTEGER :: I
-
- INTEGER :: N = 0
-
- INTEGER, PARAMETER :: NI = 1
-
- !$OMP PARALLEL DO IF(.false.)
-
- DO I = 1, NI
-
- IF (omp_in_parallel() .EQV. .false.) THEN
- !CHECK: PASS
- PRINT *, "PASS"
- ELSE
- PRINT *, "FAIL"
-
- END IF
-
- END DO
- !$OMP END PARALLEL DO
-
-END PROGRAM
>From a67dd1a14e5510b7aba9e75582c271d59065bbf8 Mon Sep 17 00:00:00 2001
From: chandan singh <chandankds at gmail.com>
Date: Fri, 12 Apr 2024 11:43:06 +0530
Subject: [PATCH 5/5] Update omp__kmpc_fork_call_if.c
fixed formatting
---
.../test/misc_bugs/omp__kmpc_fork_call_if.c | 26 +++++++++----------
1 file changed, 12 insertions(+), 14 deletions(-)
diff --git a/openmp/runtime/test/misc_bugs/omp__kmpc_fork_call_if.c b/openmp/runtime/test/misc_bugs/omp__kmpc_fork_call_if.c
index de260385670b4b..c91c9e8b34a508 100644
--- a/openmp/runtime/test/misc_bugs/omp__kmpc_fork_call_if.c
+++ b/openmp/runtime/test/misc_bugs/omp__kmpc_fork_call_if.c
@@ -3,22 +3,20 @@
#include <stdio.h>
#include <omp.h>
-
// Microtask function for parallel region
-void microtask(int* global_tid, int* bound_tid) {
-// CHECK: PASS
- if (omp_in_parallel()) {
- printf("FAIL\n");
- } else {
- printf("PASS\n");
- }
+void microtask(int *global_tid, int *bound_tid) {
+ // CHECK: PASS
+ if (omp_in_parallel()) {
+ printf("FAIL\n");
+ } else {
+ printf("PASS\n");
+ }
}
int main() {
- // Condition for parallelization (false in this case)
- int cond = 0;
-
- // Call __kmpc_fork_call_if
- __kmpc_fork_call_if(NULL, 0, microtask, cond, NULL);
- return 0;
+ // Condition for parallelization (false in this case)
+ int cond = 0;
+ // Call __kmpc_fork_call_if
+ __kmpc_fork_call_if(NULL, 0, microtask, cond, NULL);
+ return 0;
}
\ No newline at end of file
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