Auto merge of #1438 - ekse:item_name, r=emilio

Add item_name parse callback.

Issue: #428

Author: bors-servo

bindgen-integration/build.rs

@@ -23,6 +23,16 @@ impl ParseCallbacks for MacroCallback {
 
         MacroParsingBehavior::Default
     }
+
+    fn item_name(&self, original_item_name: &str) -> Option<String> {
+        if original_item_name.starts_with("my_prefixed_") {
+            Some(original_item_name.trim_start_matches("my_prefixed_").to_string())
+        } else if original_item_name.starts_with("MY_PREFIXED_") {
+            Some(original_item_name.trim_start_matches("MY_PREFIXED_").to_string())
+        } else {
+            None
+        }
+    }
 }
 
 fn main() {

bindgen-integration/cpp/Test.cc

@@ -131,3 +131,7 @@ Seventh::assert(bool first,
 };
 
 } // namespace bitfields
+
+int my_prefixed_function_name() {
+  return 4;
+}

bindgen-integration/cpp/Test.h

@@ -178,3 +178,16 @@ struct AutoRestoreBool {
 struct WithWChar {
   wchar_t foo[30];
 };
+
+// The names of the following items are unprefixed by the parse callbacks.
+const int MY_PREFIXED_CONST_VALUE = 3;
+
+int my_prefixed_function_name();
+
+struct my_prefixed_bar {
+    int foo;
+};
+
+struct my_prefixed_foo {
+   my_prefixed_bar member;
+};

bindgen-integration/src/lib.rs

@@ -282,3 +282,13 @@ fn test_virtual_dtor() {
         assert_eq!(bindings::VirtualDestructor_sDestructorCount, 1);
     }
 }
+
+#[test]
+fn test_item_rename() {
+    assert_eq!(bindings::CONST_VALUE, 3);
+    assert_eq!(unsafe{ bindings::function_name() }, 4);
+
+    let _foo = bindings::foo{
+        member: bindings::bar{foo: 2}
+    };
+}

src/callbacks.rs

@@ -55,4 +55,9 @@ pub trait ParseCallbacks: fmt::Debug + UnwindSafe {
     ) -> Option<String> {
         None
     }
+
+    /// Allows to rename an item, replacing `_original_item_name`.
+    fn item_name(&self, _original_item_name: &str) -> Option<String> {
+        None
+    }
 }

src/ir/item.rs

@@ -875,6 +875,11 @@ impl Item {
 
         let name = names.join("_");
 
+        let name = ctx
+            .parse_callbacks()
+            .and_then(|callbacks| callbacks.item_name(&name))
+            .unwrap_or(name);
+
         ctx.rust_mangle(&name).into_owned()
     }