[analyzer] Only attempt to get the value of locations of known type

Fixes https://bugs.llvm.org/show_bug.cgi?id=36474

In general, getSVal API should be changed so that it does not crash on
some non-obvious conditions.
It should either be updated to require a type, or to return Optional<SVal>.

Differential Revision: https://reviews.llvm.org/D43801

llvm-svn: 326233

2 files changed, 9 insertions, 1 deletions

diff --git a/clang/lib/StaticAnalyzer/Checkers/NonnullGlobalConstantsChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/NonnullGlobalConstantsChecker.cpp
index 0b4ecb41d20..f65e1d022ed 100644
--- a/clang/lib/StaticAnalyzer/Checkers/NonnullGlobalConstantsChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/NonnullGlobalConstantsChecker.cpp
@@ -73,9 +73,9 @@ void NonnullGlobalConstantsChecker::checkLocation(SVal location, bool isLoad,
     return;
 
   ProgramStateRef State = C.getState();
-  SVal V = State->getSVal(location.castAs<Loc>());
 
   if (isGlobalConstString(location)) {
+    SVal V = State->getSVal(location.castAs<Loc>());
     Optional<DefinedOrUnknownSVal> Constr = V.getAs<DefinedOrUnknownSVal>();
 
     if (Constr) {
diff --git a/clang/test/Analysis/novoidtypecrash.c b/clang/test/Analysis/novoidtypecrash.c
new file mode 100644
index 00000000000..c04cfca29b4
--- /dev/null
+++ b/clang/test/Analysis/novoidtypecrash.c
@@ -0,0 +1,8 @@
+// RUN: %clang_analyze_cc1 -analyzer-checker=core %s
+a;
+b(void **c) { // no-crash
+  *c = a;
+  int *d;
+  b(&d);
+  *d;
+}