[clang-reorder-fields] Emit warning when reordering breaks member init list dependencies

This diff adds a warning emitted by clang-reorder-fields 
when reordering breaks dependencies in the initializer list.

Patch by Sam Conrad!

Differential revision: https://reviews.llvm.org/D35972

llvm-svn: 309505

1 files changed, 33 insertions, 0 deletions

diff --git a/clang-tools-extra/test/clang-reorder-fields/ClassDerived.cpp b/clang-tools-extra/test/clang-reorder-fields/ClassDerived.cpp
new file mode 100644
index 00000000000..e7e9ac1c6db
--- /dev/null
+++ b/clang-tools-extra/test/clang-reorder-fields/ClassDerived.cpp
@@ -0,0 +1,33 @@
+// RUN: clang-reorder-fields -record-name bar::Derived -fields-order z,y %s -- | FileCheck %s
+
+namespace bar {
+class Base {
+public:
+  Base(int nx, int np) : x(nx), p(np) {}
+  int x;
+  int p;
+};
+
+
+class Derived : public Base {
+public:
+  Derived(long ny);
+  Derived(char nz);
+private:
+  long y;
+  char z;
+};
+
+Derived::Derived(long ny) : 
+    Base(ny, 0),
+    y(ny),                   // CHECK:       {{^  z\(static_cast<char>\(ny\)\),}}
+    z(static_cast<char>(ny)) // CHECK-NEXT:  {{^  y\(ny\)}}
+{}
+
+Derived::Derived(char nz) : 
+    Base(1, 2),
+    y(nz),  // CHECK:       {{^  z\(x\),}}
+    z(x)    // CHECK-NEXT:  {{^  y\(nz\)}}
+{}
+
+} // namespace bar