Auto merge of rust-lang#457 - emilio:test-array, r=fitzgen

tests: Add an integration test for static arrays.

Turns out they were broken before
rust-lang#456.

Let's test it so it doesn't regress.

r? @fitzgen

Author: bors-servo

bindgen-integration/cpp/Test.cc

@@ -1,5 +1,12 @@
 #include "Test.h"
 
+const int Test::COUNTDOWN[] = { 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 };
+const int* Test::COUNTDOWN_PTR = Test::COUNTDOWN;
+
+const int* Test::countdown() {
+  return COUNTDOWN;
+}
+
 const char* Test::name() {
   return "Test";
 }

bindgen-integration/cpp/Test.h

@@ -7,6 +7,10 @@ class Test {
   static const char* name();
   Test(int foo);
   Test(double foo);
+
+  static const int COUNTDOWN[];
+  static const int* COUNTDOWN_PTR;
+  static const int* countdown();
 };
 
 namespace testing {

bindgen-integration/src/lib.rs

@@ -3,6 +3,29 @@ mod bindings {
 }
 
 use std::ffi::CStr;
+use std::os::raw::c_int;
+
+#[test]
+fn test_static_array() {
+    let mut test = unsafe { bindings::Test_COUNTDOWN.as_ptr() };
+    let expected = unsafe { bindings::Test_countdown()};
+    let also_expected = unsafe { bindings::Test_COUNTDOWN_PTR };
+    assert!(!test.is_null());
+    assert_eq!(also_expected, expected);
+    assert_eq!(test, also_expected);
+
+    let mut expected = 10;
+    unsafe {
+        loop {
+            assert_eq!(*test, expected);
+            if *test == 0 {
+                break;
+            }
+            test = test.offset(1);
+            expected -= 1;
+        }
+    }
+}
 
 #[test]
 fn test_static_method() {

src/codegen/mod.rs

@@ -2385,31 +2385,48 @@ mod utils {
 
                 #[inline]
                 pub unsafe fn as_slice(&self, len: usize) -> &[T] {
-                    ::std::slice::from_raw_parts(self.as_ptr(), len)
+                    ::$prefix::slice::from_raw_parts(self.as_ptr(), len)
                 }
 
                 #[inline]
                 pub unsafe fn as_mut_slice(&mut self, len: usize) -> &mut [T] {
-                    ::std::slice::from_raw_parts_mut(self.as_mut_ptr(), len)
+                    ::$prefix::slice::from_raw_parts_mut(self.as_mut_ptr(), len)
                 }
             }
         )
             .unwrap();
 
         let incomplete_array_debug_impl = quote_item!(ctx.ext_cx(),
-            impl<T> ::std::fmt::Debug for __IncompleteArrayField<T> {
-                fn fmt(&self, fmt: &mut ::std::fmt::Formatter)
-                       -> ::std::fmt::Result {
+            impl<T> ::$prefix::fmt::Debug for __IncompleteArrayField<T> {
+                fn fmt(&self, fmt: &mut ::$prefix::fmt::Formatter)
+                       -> ::$prefix::fmt::Result {
                     fmt.write_str("__IncompleteArrayField")
                 }
             }
         )
             .unwrap();
 
+        let incomplete_array_clone_impl = quote_item!(&ctx.ext_cx(),
+            impl<T> ::$prefix::clone::Clone for __IncompleteArrayField<T> {
+                #[inline]
+                fn clone(&self) -> Self {
+                    Self::new()
+                }
+            }
+        )
+            .unwrap();
+
+        let incomplete_array_copy_impl = quote_item!(&ctx.ext_cx(),
+            impl<T> ::$prefix::marker::Copy for __IncompleteArrayField<T> {}
+        )
+            .unwrap();
+
         let items = vec![
             incomplete_array_decl,
             incomplete_array_impl,
             incomplete_array_debug_impl,
+            incomplete_array_clone_impl,
+            incomplete_array_copy_impl,
         ];
 
         let old_items = mem::replace(result, items);

tests/expectations/tests/class.rs

@@ -31,6 +31,11 @@ impl <T> ::std::fmt::Debug for __IncompleteArrayField<T> {
         fmt.write_str("__IncompleteArrayField")
     }
 }
+impl <T> ::std::clone::Clone for __IncompleteArrayField<T> {
+    #[inline]
+    fn clone(&self) -> Self { Self::new() }
+}
+impl <T> ::std::marker::Copy for __IncompleteArrayField<T> { }
 #[repr(C)]
 pub struct __BindgenUnionField<T>(::std::marker::PhantomData<T>);
 impl <T> __BindgenUnionField<T> {
@@ -112,6 +117,16 @@ fn bindgen_test_layout_WithDtor() {
     assert_eq!(::std::mem::align_of::<WithDtor>() , 4usize);
 }
 #[repr(C)]
+pub struct IncompleteArrayNonCopiable {
+    pub whatever: *mut ::std::os::raw::c_void,
+    pub incomplete_array: __IncompleteArrayField<C>,
+}
+#[test]
+fn bindgen_test_layout_IncompleteArrayNonCopiable() {
+    assert_eq!(::std::mem::size_of::<IncompleteArrayNonCopiable>() , 8usize);
+    assert_eq!(::std::mem::align_of::<IncompleteArrayNonCopiable>() , 8usize);
+}
+#[repr(C)]
 #[derive(Debug, Copy)]
 pub struct Union {
     pub d: __BindgenUnionField<f32>,

tests/headers/class.hpp

@@ -32,6 +32,11 @@ class WithDtor {
     ~WithDtor() {}
 };
 
+class IncompleteArrayNonCopiable {
+  void* whatever;
+  C incomplete_array[];
+};
+
 union Union {
     float d;
     int i;