[analyzer] C++ initializers may require cleanups; look through these.

When the analyzer sees an initializer, it checks if the initializer
contains a CXXConstructExpr. If so, it trusts that the CXXConstructExpr
does the necessary work to initialize the object, and performs no further
initialization.

This patch looks through any implicit wrapping expressions like
ExprWithCleanups to find the CXXConstructExpr inside.

Fixes PR15070.

llvm-svn: 173557

clang/lib/StaticAnalyzer/Core/ExprEngine.cpp

@@ -404,7 +404,7 @@ void ExprEngine::ProcessInitializer(const CFGInitializer Init,
   if (BMI->isAnyMemberInitializer()) {
     // Constructors build the object directly in the field,
     // but non-objects must be copied in from the initializer.
-    const Expr *Init = BMI->getInit();
+    const Expr *Init = BMI->getInit()->IgnoreImplicit();
     if (!isa<CXXConstructExpr>(Init)) {
       SVal FieldLoc;
       if (BMI->isIndirectMemberInitializer())

clang/test/Analysis/initializer.cpp

@@ -80,3 +80,33 @@ class StringWrapper {
 public:
   StringWrapper(const char *input) : str(strdup(input)) {} // no-warning
 };
+
+
+// PR15070 - Constructing a type containing a non-POD array mistakenly
+// tried to perform a bind instead of relying on the CXXConstructExpr,
+// which caused a cast<> failure in RegionStore.
+namespace DefaultConstructorWithCleanups {
+  class Element {
+  public:
+    int value;
+
+    class Helper {
+    public:
+      ~Helper();
+    };
+    Element(Helper h = Helper());
+  };
+  class Wrapper {
+  public:
+    Element arr[2];
+
+    Wrapper();
+  };
+
+  Wrapper::Wrapper() /* initializers synthesized */ {}
+
+  int test() {
+    Wrapper w;
+    return w.arr[0].value; // no-warning
+  }
+}