Add clang-reorder-fields to clang-tools-extra

This diff adds v0 of clang-reorder-fields tool to clang/tools/extra.
The main idea behind this tool is to simplify and make less error-prone refactoring of large codebases when
someone needs to change the order fields of a struct/class (for example to remove excess padding).

Differential revision: https://reviews.llvm.org/D23279

llvm-svn: 280431

1 files changed, 14 insertions, 0 deletions

diff --git a/clang-tools-extra/test/clang-reorder-fields/AggregatePartialInitialization.cpp b/clang-tools-extra/test/clang-reorder-fields/AggregatePartialInitialization.cpp
new file mode 100644
index 00000000000..9d09c818775
--- /dev/null
+++ b/clang-tools-extra/test/clang-reorder-fields/AggregatePartialInitialization.cpp
@@ -0,0 +1,14 @@
+// RUN: clang-reorder-fields -record-name Foo -fields-order z,y,x %s -- | FileCheck %s
+
+// The order of fields should not change.
+class Foo {
+public:
+  int x;  // CHECK:       {{^  int x;}}
+  int y;  // CHECK-NEXT:  {{^  int y;}}
+  int z;  // CHECK-NEXT:  {{^  int z;}}
+};
+
+int main() {
+  Foo foo = { 0, 1 }; // CHECK: {{^  Foo foo = { 0, 1 };}}
+  return 0;
+}