[analyzer] Reapply r271907 (2nd try).

Second try at reapplying
"[analyzer] Add checker for correct usage of MPI API in C and C++."

Special thanks to Dan Liew for helping test the fix for the template
specialization compiler error with gcc.

The original patch is by Alexander Droste!

Differential Revision: http://reviews.llvm.org/D12761

llvm-svn: 271977

1 files changed, 34 insertions, 0 deletions

diff --git a/clang/test/Analysis/mpicheckernotes.cpp b/clang/test/Analysis/mpicheckernotes.cpp
new file mode 100644
index 00000000000..be312fdf5fd
--- /dev/null
+++ b/clang/test/Analysis/mpicheckernotes.cpp
@@ -0,0 +1,34 @@
+// RUN: %clang_cc1 -analyze -analyzer-checker=optin.mpi.MPI-Checker -analyzer-output=text -verify %s
+
+// MPI-Checker test file to test note diagnostics.
+
+#include "MPIMock.h"
+
+void doubleNonblocking() {
+  double buf = 0;
+  MPI_Request sendReq;
+  MPI_Isend(&buf, 1, MPI_DOUBLE, 0, 0, MPI_COMM_WORLD, &sendReq); // expected-note{{Request is previously used by nonblocking call here.}}
+  MPI_Irecv(&buf, 1, MPI_DOUBLE, 0, 0, MPI_COMM_WORLD, &sendReq); // expected-warning{{Double nonblocking on request 'sendReq'.}} expected-note{{Double nonblocking on request 'sendReq'.}}
+  MPI_Wait(&sendReq, MPI_STATUS_IGNORE);
+}
+
+void missingWait() {
+  double buf = 0;
+  MPI_Request sendReq;
+  MPI_Ireduce(MPI_IN_PLACE, &buf, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD, &sendReq); // expected-note{{Request is previously used by nonblocking call here.}}
+} // expected-warning{{Request 'sendReq' has no matching wait.}} expected-note{{Request 'sendReq' has no matching wait.}}
+
+// If more than 2 nonblocking calls are using a request in a sequence, they all
+// point to the first call as the 'previous' call. This is because the
+// BugReporterVisitor only checks for differences in state or existence of an
+// entity.
+void tripleNonblocking() {
+  double buf = 0;
+  MPI_Request sendReq;
+  MPI_Isend(&buf, 1, MPI_DOUBLE, 0, 0, MPI_COMM_WORLD, &sendReq); // expected-note 2{{Request is previously used by nonblocking call here.}}
+  MPI_Irecv(&buf, 1, MPI_DOUBLE, 0, 0, MPI_COMM_WORLD, &sendReq); // expected-warning{{Double nonblocking on request 'sendReq'.}} expected-note{{Double nonblocking on request 'sendReq'.}}
+
+  MPI_Isend(&buf, 1, MPI_DOUBLE, 0, 0, MPI_COMM_WORLD, &sendReq); // expected-warning{{Double nonblocking on request 'sendReq'.}} expected-note{{Double nonblocking on request 'sendReq'.}}
+
+  MPI_Wait(&sendReq, MPI_STATUS_IGNORE);
+}