Index: test/TestRunner.sh
===================================================================
--- test/TestRunner.sh	(revision 48603)
+++ test/TestRunner.sh	(working copy)
@@ -11,7 +11,7 @@
 #     %llvmgcc - llvm-gcc command
 #     %llvmgxx - llvm-g++ command
 #     %prcontext - prcontext.tcl script
-#     %t1 - temporary file name (derived from testcase name)
+#     %t - temporary file name (derived from testcase name)
 #
 
 FILENAME=$1
@@ -40,20 +40,44 @@
    exit 1
 )
 
+# Run under valgrind if the VG environment variable has been set.
+CLANG="clang"
+if [ -n "$VG" ]; then
+  rm -f $OUTPUT.vg.*
+  CLANG="valgrind --leak-check=full -q --log-file=$OUTPUT.vg $CLANG"
+fi
+
 SCRIPT=$OUTPUT.script
 TEMPOUTPUT=$OUTPUT.tmp
-grep 'RUN:' $FILENAME | sed "s|^.*RUN:\(.*\)$|\1|g;s|%s|$SUBST|g;s|%llvmgcc|llvm-gcc -emit-llvm|g;s|%llvmgxx|llvm-g++ -emit-llvm|g;s|%prcontext|prcontext.tcl|g;s|%t|$TEMPOUTPUT|g" > $SCRIPT  
+grep 'RUN:' $FILENAME | \
+  sed -e "s|^.*RUN:\(.*\)$|\1$VG_AFTER|g" \
+      -e "s|%s|$SUBST|g" \
+      -e "s|%llvmgcc|llvm-gcc -emit-llvm|g" \
+      -e "s|%llvmgxx|llvm-g++ -emit-llvm|g" \
+      -e "s|%prcontext|prcontext.tcl|g" \
+      -e "s|%t|$TEMPOUTPUT|g" \
+      -e "s|clang|$CLANG|g" > $SCRIPT  
 
 grep -q XFAIL $FILENAME && (printf "XFAILED '$TESTNAME': "; grep XFAIL $FILENAME)
 
-/bin/sh $SCRIPT > $OUTPUT 2>&1 || (
+/bin/sh $SCRIPT > $OUTPUT 2>&1
+SCRIPT_STATUS=$?
+VG_STATUS=`cat $OUTPUT.vg.* | wc -l`
+if [ $SCRIPT_STATUS -ne 0 -o -n "$VG" -a $VG_STATUS -ne 0 ]; then
   echo "******************** TEST '$TESTNAME' FAILED! ********************"
   echo "Command: "
   cat $SCRIPT
-  echo "Output:"
+  if [ $SCRIPT_STATUS -eq 0 ]; then
+    echo "Output:"
+  else
+    echo "Incorrect Output:"
+  fi
   cat $OUTPUT
-  rm $OUTPUT
+  if [ -n "$VG" -a $VG_STATUS -ne 0 ]; then
+    echo "Valgrind Output:"
+    cat $OUTPUT.vg.*
+  fi
   echo "******************** TEST '$TESTNAME' FAILED! ********************"
   exit 1
-)
+fi
 
Index: test/Makefile.parallel
===================================================================
--- test/Makefile.parallel	(revision 48601)
+++ test/Makefile.parallel	(working copy)
@@ -22,7 +22,7 @@
 
 Output/%.testresults: %
 	@ $(PROGRESS)
-	@ PATH=$$PATH:$(ToolDir):$(LLVM_SRC_ROOT)/test/Scripts ./TestRunner.sh $< > $@ || $(REPORTFAIL)
+	@ PATH=$$PATH:$(ToolDir):$(LLVM_SRC_ROOT)/test/Scripts VG=$(VG) ./TestRunner.sh $< > $@ || $(REPORTFAIL)
 
 all::
 	@ mkdir -p $(addprefix Output/, $(TESTDIRS))
Index: test/Makefile
===================================================================
--- test/Makefile	(revision 48601)
+++ test/Makefile	(working copy)
@@ -9,7 +9,7 @@
 endif
 
 all::
-	PATH=$$PATH:$(ToolDir):$(LLVM_SRC_ROOT)/test/Scripts \
+	PATH=$$PATH:$(ToolDir):$(LLVM_SRC_ROOT)/test/Scripts VG=$(VG) \
           find $(TESTDIRS) \( -name '*.c' -or -name '*.cpp' -or -name '*.m' \) \
 	      -print -exec ./TestRunner.sh {} \;