r174182 - Fixed segmentation fault when a CFGBlock has NULL successor.

[Alexander Kornienko]

Author: alexfh
Date: Fri Feb  1 09:39:20 2013
New Revision: 174182

URL: http://llvm.org/viewvc/llvm-project?rev=174182&view=rev
Log:
Fixed segmentation fault when a CFGBlock has NULL successor.

Modified:
    cfe/trunk/lib/Sema/AnalysisBasedWarnings.cpp
    cfe/trunk/test/SemaCXX/switch-implicit-fallthrough.cpp

Modified: cfe/trunk/lib/Sema/AnalysisBasedWarnings.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/AnalysisBasedWarnings.cpp?rev=174182&r1=174181&r2=174182&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/AnalysisBasedWarnings.cpp (original)
+++ cfe/trunk/lib/Sema/AnalysisBasedWarnings.cpp Fri Feb  1 09:39:20 2013
@@ -714,7 +714,7 @@ namespace {
         for (CFGBlock::const_succ_iterator I = P->succ_begin(),
                                            E = P->succ_end();
              I != E; ++I) {
-          if (ReachableBlocks.insert(*I))
+          if (*I && ReachableBlocks.insert(*I))
             BlockQueue.push_back(*I);
         }
       }

Modified: cfe/trunk/test/SemaCXX/switch-implicit-fallthrough.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/switch-implicit-fallthrough.cpp?rev=174182&r1=174181&r2=174182&view=diff
==============================================================================
--- cfe/trunk/test/SemaCXX/switch-implicit-fallthrough.cpp (original)
+++ cfe/trunk/test/SemaCXX/switch-implicit-fallthrough.cpp Fri Feb  1 09:39:20 2013
@@ -172,6 +172,11 @@ int fallthrough_macro1(int n) {
   return n;
 }
 
+void fallthrough_cfgblock_with_null_successor(int x) {
+  (x && "") ? (void)(0) : (void)(1);
+  switch (x) {}
+}
+
 int fallthrough_position(int n) {
   switch (n) {
       [[clang::fallthrough]];  // expected-warning{{fallthrough annotation in unreachable code}}