[OpenMP] libomptarget: move debugging dumps under control of env var LIBOMPTARGET_DEBUG

Disable default debugging dumps for libomptarget and plugins and move dumps
under control of environment variable LIBOMPTARGET_DEBUG=<integer>. Dumps
are enabled when LIBOMPTARGET_DEBUG is set to a positive integer value.

Debugging dumps are available only in debug build; release build does not
support it.

Differential Revision: https://reviews.llvm.org/D33227

llvm-svn: 310841

1 files changed, 19 insertions, 1 deletions

diff --git a/openmp/libomptarget/src/omptarget.cpp b/openmp/libomptarget/src/omptarget.cpp
index 8edc3f7db22..95e0e1ee2ba 100644
--- a/openmp/libomptarget/src/omptarget.cpp
+++ b/openmp/libomptarget/src/omptarget.cpp
@@ -27,7 +27,19 @@
 // Header file global to this project
 #include "omptarget.h"
 
-#define DP(...) DEBUGP("Libomptarget", __VA_ARGS__)
+#ifdef OMPTARGET_DEBUG
+static int DebugLevel = 0;
+
+#define DP(...) \
+  do { \
+    if (DebugLevel > 0) { \
+      DEBUGP("Libomptarget", __VA_ARGS__); \
+    } \
+  } while (false)
+#else // OMPTARGET_DEBUG
+#define DP(...) {}
+#endif // OMPTARGET_DEBUG
+
 #define INF_REF_CNT (LONG_MAX>>1) // leave room for additions/subtractions
 #define CONSIDERED_INF(x) (x > (INF_REF_CNT>>1))
 
@@ -281,6 +293,12 @@ public:
 };
 
 void RTLsTy::LoadRTLs() {
+#ifdef OMPTARGET_DEBUG
+  if (char *envStr = getenv("LIBOMPTARGET_DEBUG")) {
+    DebugLevel = std::stoi(envStr);
+  }
+#endif // OMPTARGET_DEBUG
+
   // Parse environment variable OMP_TARGET_OFFLOAD (if set)
   char *envStr = getenv("OMP_TARGET_OFFLOAD");
   if (envStr && !strcmp(envStr, "DISABLED")) {