[analyzer] Checker for uninitialized C++ objects

This checker analyzes C++ constructor calls, and reports uninitialized fields.

Due to the nature of this problem (uninitialized fields after an object
construction), this checker doesn't search for bugs, but rather is a tool to
enforce a specific programming model where every field needs to be initialized.

This checker lands in alpha for now, and a number of followup patches will be
made to reduce false negatives and to make it easier for the user to understand
what rules the checker relies on, eg. whether a derived class' constructor is
responsible for initializing inherited data members or whether it should be
handled in the base class' constructor.

Differential Revision: https://reviews.llvm.org/D45532

llvm-svn: 334935

clang/include/clang/StaticAnalyzer/Checkers/Checkers.td

@@ -319,6 +319,10 @@ def MisusedMovedObjectChecker: Checker<"MisusedMovedObject">,
               "object will be reported">,
      DescFile<"MisusedMovedObjectChecker.cpp">;
 
+def UninitializedObjectChecker: Checker<"UninitializedObject">,
+     HelpText<"Reports uninitialized fields after object construction">,
+     DescFile<"UninitializedObjectChecker.cpp">;
+
 } // end: "alpha.cplusplus"
 
 

clang/lib/StaticAnalyzer/Checkers/CMakeLists.txt

@@ -92,6 +92,7 @@ add_clang_library(clangStaticAnalyzerCheckers
   UndefResultChecker.cpp
   UndefinedArraySubscriptChecker.cpp
   UndefinedAssignmentChecker.cpp
+  UninitializedObjectChecker.cpp
   UnixAPIChecker.cpp
   UnreachableCodeChecker.cpp
   VforkChecker.cpp