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, 16 insertions, 0 deletions

diff --git a/clang-tools-extra/test/clang-reorder-fields/CStructFieldsOrder.cpp b/clang-tools-extra/test/clang-reorder-fields/CStructFieldsOrder.cpp
new file mode 100644
index 00000000000..2ed3578df65
--- /dev/null
+++ b/clang-tools-extra/test/clang-reorder-fields/CStructFieldsOrder.cpp
@@ -0,0 +1,16 @@
+// RUN: clang-reorder-fields -record-name ::bar::Foo -fields-order z,w,y,x %s -- | FileCheck %s
+
+namespace bar {
+struct Foo {
+  const int* x; // CHECK:      {{^  double z;}}
+  int y;        // CHECK-NEXT: {{^  int w;}}
+  double z;     // CHECK-NEXT: {{^  int y;}}
+  int w;        // CHECK-NEXT: {{^  const int\* x}}
+};
+} // end namespace bar
+
+int main() {
+  const int x = 13;
+  bar::Foo foo = { &x, 0, 1.29, 17 }; // CHECK: {{^  bar::Foo foo = { 1.29, 17, 0, &x };}} 
+  return 0;
+}