Added support for #[repr(transparent)]

tests/expectations/both/transparent.c

@@ -0,0 +1,24 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+typedef struct DummyStruct DummyStruct;
+
+typedef DummyStruct TransparentComplexWrappingStructTuple;
+
+typedef uint32_t TransparentPrimitiveWrappingStructTuple;
+
+typedef DummyStruct TransparentComplexWrappingStructure;
+
+typedef uint32_t TransparentPrimitiveWrappingStructure;
+
+typedef DummyStruct TransparentComplexWrapper_i32;
+
+typedef uint32_t TransparentPrimitiveWrapper_i32;
+
+void root(TransparentComplexWrappingStructTuple a,
+          TransparentPrimitiveWrappingStructTuple b,
+          TransparentComplexWrappingStructure c,
+          TransparentPrimitiveWrappingStructure d,
+          TransparentComplexWrapper_i32 e,
+          TransparentPrimitiveWrapper_i32 f);

tests/expectations/tag/transparent.c

@@ -0,0 +1,24 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+struct DummyStruct;
+
+typedef struct DummyStruct TransparentComplexWrappingStructTuple;
+
+typedef uint32_t TransparentPrimitiveWrappingStructTuple;
+
+typedef struct DummyStruct TransparentComplexWrappingStructure;
+
+typedef uint32_t TransparentPrimitiveWrappingStructure;
+
+typedef struct DummyStruct TransparentComplexWrapper_i32;
+
+typedef uint32_t TransparentPrimitiveWrapper_i32;
+
+void root(TransparentComplexWrappingStructTuple a,
+          TransparentPrimitiveWrappingStructTuple b,
+          TransparentComplexWrappingStructure c,
+          TransparentPrimitiveWrappingStructure d,
+          TransparentComplexWrapper_i32 e,
+          TransparentPrimitiveWrapper_i32 f);

tests/expectations/transparent.c

@@ -0,0 +1,24 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+typedef struct DummyStruct DummyStruct;
+
+typedef DummyStruct TransparentComplexWrappingStructTuple;
+
+typedef uint32_t TransparentPrimitiveWrappingStructTuple;
+
+typedef DummyStruct TransparentComplexWrappingStructure;
+
+typedef uint32_t TransparentPrimitiveWrappingStructure;
+
+typedef DummyStruct TransparentComplexWrapper_i32;
+
+typedef uint32_t TransparentPrimitiveWrapper_i32;
+
+void root(TransparentComplexWrappingStructTuple a,
+          TransparentPrimitiveWrappingStructTuple b,
+          TransparentComplexWrappingStructure c,
+          TransparentPrimitiveWrappingStructure d,
+          TransparentComplexWrapper_i32 e,
+          TransparentPrimitiveWrapper_i32 f);

tests/expectations/transparent.cpp

@@ -0,0 +1,29 @@
+#include <cstdint>
+#include <cstdlib>
+
+struct DummyStruct;
+
+using TransparentComplexWrappingStructTuple = DummyStruct;
+
+using TransparentPrimitiveWrappingStructTuple = uint32_t;
+
+using TransparentComplexWrappingStructure = DummyStruct;
+
+using TransparentPrimitiveWrappingStructure = uint32_t;
+
+template<typename T>
+using TransparentComplexWrapper = DummyStruct;
+
+template<typename T>
+using TransparentPrimitiveWrapper = uint32_t;
+
+extern "C" {
+
+void root(TransparentComplexWrappingStructTuple a,
+          TransparentPrimitiveWrappingStructTuple b,
+          TransparentComplexWrappingStructure c,
+          TransparentPrimitiveWrappingStructure d,
+          TransparentComplexWrapper<int32_t> e,
+          TransparentPrimitiveWrapper<int32_t> f);
+
+} // extern "C"

tests/rust/transparent.rs

@@ -0,0 +1,41 @@
+struct DummyStruct;
+
+// Transparent struct tuple wrapping a struct.
+#[repr(transparent)]
+struct TransparentComplexWrappingStructTuple(DummyStruct);
+
+// Transparent struct tuple wrapping a primitive.
+#[repr(transparent)]
+struct TransparentPrimitiveWrappingStructTuple(u32);
+
+// Transparent structure wrapping a struct.
+#[repr(transparent)]
+struct TransparentComplexWrappingStructure { only_field: DummyStruct }
+
+// Transparent structure wrapping a primitive.
+#[repr(transparent)]
+struct TransparentPrimitiveWrappingStructure { only_field: u32 }
+
+// Transparent struct wrapper with a marker wrapping a struct.
+#[repr(transparent)]
+struct TransparentComplexWrapper<T> {
+    only_non_zero_sized_field: DummyStruct,
+    marker: PhantomData<T>,
+}
+
+// Transparent struct wrapper with a marker wrapping a primitive.
+#[repr(transparent)]
+struct TransparentPrimitiveWrapper<T> {
+    only_non_zero_sized_field: u32,
+    marker: PhantomData<T>,
+}
+
+#[no_mangle]
+pub extern "C" fn root(
+    a: TransparentComplexWrappingStructTuple,
+    b: TransparentPrimitiveWrappingStructTuple,
+    c: TransparentComplexWrappingStructure,
+    d: TransparentPrimitiveWrappingStructure,
+    e: TransparentComplexWrapper<i32>,
+    f: TransparentPrimitiveWrapper<i32>,
+) { }