Auto merge of #110 - heycam:stable-gen-names, r=emilio

Give vtables and anonymous items more stable generated names (fixes #60)

r? @emilio

This works pretty well.  There are two remaining things in stylo's structs files that have identifiers that look like they won't be that stable: the anonymous enum for the NODE_* flags at the top level, and the `typedef union { ... } nsStyleUnion`.  There are various anonymous enums and other things at the top level in system headers that cause these identifiers to have generated IDs in them higher than 1 and 2.

Probably for anonymous enums we could just avoid generating a rust enum altogether, since having the static consts should be sufficient.  I tried to mess with the codegen to automatically treat `typedef union { ... } nsStyleUnion` like `union nsStyleUnion { ... }` but it seems the way clang exposes the typedef and union are as two adjacent cursors rather than a parent-child relationship, so it's not so easy.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/codegen/mod.rs b/src/codegen/mod.rs
index 17789e19..65900739 100644
--- a/src/codegen/mod.rs
+++ b/src/codegen/mod.rs
@@ -445,8 +445,8 @@ impl<'a> CodeGenerator for Vtable<'a> {
 }
 
 impl<'a> ItemCanonicalName for Vtable<'a> {
-    fn canonical_name(&self, _ctx: &BindgenContext) -> String {
-        format!("bindgen_vtable_{}", self.item_id)
+    fn canonical_name(&self, ctx: &BindgenContext) -> String {
+        format!("{}__bindgen_vtable", self.item_id.canonical_name(ctx))
     }
 }