[OMPT] Add support for ompt_event_task_dependences and ompt_event_task_dependence_pair

The attached patch adds support for ompt_event_task_dependences and
ompt_event_task_dependence_pair events from the OMPT specification [1]. These
events only apply to OpenMP 4.0 and 4.1 (aka 4.5) because task dependencies
were introduced in 4.0.

With respect to the changes:

ompt_event_task_dependences
According to the specification, this event is raised after the task has been
created, thefore this event needs to be raised after ompt_event_task_begin
(in __kmp_task_start). However, the dependencies are known at
__kmpc_omp_task_with_deps which occurs before __kmp_task_start. My modifications
extend the ompt_task_info_t struct in order to store the dependencies of the
task when _kmpc_omp_task_with_deps occurs and then they are emitted in
__kmp_task_start just after raising the ompt_event_task_begin. The deps field
is allocated and valid until the event is raised and it is freed and set
to null afterwards.

ompt_event_task_dependence_pair
The processing of the dependences (i.e. checking whenever a dependence is
already satisfied) is done within __kmp_process_deps. That function checks
every dependence and calls the __kmp_track_dependence routine which gives some
support for graphical output. I used that routine to emit the dependence pair
but I also needed to know the sink_task. Despite the fact that the code within
KMP_SUPPORT_GRAPH_OUTPUT refers to task_sink it may be null because
sink->dn.task (there's a comment regarding this) and in fact it does not point
to a proper pointer value because the value is set in node->dn.task = task;
after the __kmp_process_deps calls in __kmp_check_deps. I have extended the
__kmp_process_deps and __kmp_track_dependence parameter list to receive the
sink_task.

[1] https://github.com/OpenMPToolsInterface/OMPT-Technical-Report/blob/target/ompt-tr.pdf

Patch by Harald Servat
Differential Revision: http://reviews.llvm.org/D14746

llvm-svn: 259038

1 files changed, 17 insertions, 3 deletions

diff --git a/openmp/runtime/src/ompt-internal.h b/openmp/runtime/src/ompt-internal.h
index 64e8d2e8fd6..42da9d86793 100644
--- a/openmp/runtime/src/ompt-internal.h
+++ b/openmp/runtime/src/ompt-internal.h
@@ -26,9 +26,13 @@ typedef struct ompt_callbacks_s {
 
 
 typedef struct {
-    ompt_frame_t        frame;
-    void*               function;
-    ompt_task_id_t      task_id;
+    ompt_frame_t            frame;
+    void*                   function;
+    ompt_task_id_t          task_id;
+#if OMP_40_ENABLED
+    int                     ndeps;
+    ompt_task_dependence_t  *deps;
+#endif /* OMP_40_ENABLED */
 } ompt_task_info_t;
 
 
@@ -62,6 +66,16 @@ typedef struct {
 
 extern ompt_callbacks_t ompt_callbacks;
 
+#if OMP_40_ENABLED && OMPT_SUPPORT && OMPT_TRACE
+#if USE_FAST_MEMORY
+#  define KMP_OMPT_DEPS_ALLOC __kmp_fast_allocate
+#  define KMP_OMPT_DEPS_FREE __kmp_fast_free
+# else
+#  define KMP_OMPT_DEPS_ALLOC __kmp_thread_malloc
+#  define KMP_OMPT_DEPS_FREE __kmp_thread_free
+# endif
+#endif /* OMP_40_ENABLED && OMPT_SUPPORT && OMPT_TRACE */
+
 #ifdef __cplusplus
 extern "C" {
 #endif