Clean up static analyzer warnings.

Clang's static analyzer found several potential cases of undefined
behavior, use of un-initialized values, and potentially null pointer
dereferences in tablegen, Support, MC, and ADT. This cleans them up
with specific assertions on the assumptions of the code.

llvm-svn: 224154

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/MC/MCObjectStreamer.cpp b/llvm/lib/MC/MCObjectStreamer.cpp
index 21e68678e75..08fe5017bd5 100644
--- a/llvm/lib/MC/MCObjectStreamer.cpp
+++ b/llvm/lib/MC/MCObjectStreamer.cpp
@@ -405,7 +405,9 @@ void MCObjectStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
 }
 
 void MCObjectStreamer::EmitZeros(uint64_t NumBytes) {
-  unsigned ItemSize = getCurrentSection().first->isVirtualSection() ? 0 : 1;
+  const MCSection *Sec = getCurrentSection().first;
+  assert(Sec && "need a section");
+  unsigned ItemSize = Sec->isVirtualSection() ? 0 : 1;
   insert(new MCFillFragment(0, ItemSize, NumBytes));
 }