[PATCH] Fix UseNullptr fails to replace explicit cast to nullptr assigned to const pointers

[Ariel Bernal]

  - Simplified Matcher with Edwin's comments
  - Added a new test case with a chain of explicit casts with condition within.

Hi revane, tareqsiraj,

http://llvm-reviews.chandlerc.com/D627

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D627?vs=1512&id=1532#toc

Files:
  cpp11-migrate/UseNullptr/NullptrMatchers.cpp
  test/cpp11-migrate/UseNullptr/basic.cpp

Index: cpp11-migrate/UseNullptr/NullptrMatchers.cpp
===================================================================
--- cpp11-migrate/UseNullptr/NullptrMatchers.cpp
+++ cpp11-migrate/UseNullptr/NullptrMatchers.cpp
@@ -58,10 +58,12 @@
     );
 
   return castExpr(
-           unless(hasAncestor(explicitCastExpr())),
            anyOf(
-             hasDescendant(ImplicitCastToNull),
-             ImplicitCastToNull
-           )
+             ImplicitCastToNull,
+             explicitCastExpr(
+               hasDescendant(ImplicitCastToNull)
+             )
+           ),
+           unless(hasAncestor(explicitCastExpr()))
          ).bind(CastSequence);
 }
Index: test/cpp11-migrate/UseNullptr/basic.cpp
===================================================================
--- test/cpp11-migrate/UseNullptr/basic.cpp
+++ test/cpp11-migrate/UseNullptr/basic.cpp
@@ -221,6 +221,8 @@
 
 void ambiguous_function(int *a) {}
 void ambiguous_function(float *a) {}
+void const_ambiguous_function(const int *p) {}
+void const_ambiguous_function(const float *p) {}
 
 void test_explicit_cast_ambiguous1() {
   ambiguous_function((int*)0);
@@ -251,3 +253,26 @@
   k = (int*)0;
   // CHECK: k = (int*)nullptr;
 }
+
+void test_const_pointers_abiguous() {
+  const_ambiguous_function((int*)0);
+  // CHECK: const_ambiguous_function((int*)nullptr);
+}
+
+// Test where the implicit cast to null is surrounded by another implict cast
+// with possible explict casts in-between
+void test_const_pointers() {
+  const int *const_p1 = 0;
+  // CHECK: const int *const_p1 = nullptr;
+  const int *const_p2 = NULL;
+  // CHECK: const int *const_p2 = nullptr;
+  const int *const_p3 = (int)0;
+  // CHECK: const int *const_p3 = nullptr;
+  const int *const_p4 = (int)0.0f;
+  // CHECK: const int *const_p4 = nullptr;
+  const int *const_p5 = (int*)0;
+  // CHECK: const int *const_p5 = (int*)nullptr;
+  int *t;
+  const int *const_p6 = static_cast<int*>(t ? t : static_cast<int*>(0));
+  // CHECK: const int *const_p6 = static_cast<int*>(t ? t : static_cast<int*>(nullptr));
+}
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