Generate thunks for address-taken imports (#554)

Under emscripten, C code can take the address of a function implemented
in Javascript (which is exposed via an import in wasm). Because imports
do not have linear memory address in wasm, we need to generate a thunk
to be the target of the indirect call; it call the import directly.

This is facilited by a new .s directive (.functype) which declares the
types of functions which are declared but not defined.

Fixes https://github.com/WebAssembly/binaryen/issues/392

1 files changed, 1 insertions, 1 deletions

diff --git a/src/mixed_arena.h b/src/mixed_arena.h
index 77aa052c1..28b2dd462 100644
--- a/src/mixed_arena.h
+++ b/src/mixed_arena.h
@@ -217,7 +217,7 @@ public:
   }
 
   template<typename ListType>
-  void set(ListType& list) {
+  void set(const ListType& list) {
     size_t size = list.size();
     if (allocatedElements < size) {
       allocate(size);