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/asmjs/asm_v_wasm.cpp b/src/asmjs/asm_v_wasm.cpp
index 14a7fbdae..648871100 100644
--- a/src/asmjs/asm_v_wasm.cpp
+++ b/src/asmjs/asm_v_wasm.cpp
@@ -53,7 +53,7 @@ char getSig(WasmType type) {
   }
 }
 
-std::string getSig(FunctionType *type) {
+std::string getSig(const FunctionType *type) {
   std::string ret;
   ret += getSig(type->result);
   for (auto param : type->params) {