Add support for reference types proposal (#2451)

This adds support for the reference type proposal. This includes support
for all reference types (`anyref`, `funcref`(=`anyfunc`), and `nullref`)
and four new instructions: `ref.null`, `ref.is_null`, `ref.func`, and
new typed `select`. This also adds subtype relationship support between
reference types.

This does not include table instructions yet. This also does not include
wasm2js support.

Fixes #2444 and fixes #2447.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/wasm2js.h b/src/wasm2js.h
index 2cacbe8e5..1adde23b8 100644
--- a/src/wasm2js.h
+++ b/src/wasm2js.h
@@ -1848,6 +1848,18 @@ Ref Wasm2JSBuilder::processFunctionBody(Module* m,
       unimplemented(curr);
       WASM_UNREACHABLE("unimp");
     }
+    Ref visitRefNull(RefNull* curr) {
+      unimplemented(curr);
+      WASM_UNREACHABLE("unimp");
+    }
+    Ref visitRefIsNull(RefIsNull* curr) {
+      unimplemented(curr);
+      WASM_UNREACHABLE("unimp");
+    }
+    Ref visitRefFunc(RefFunc* curr) {
+      unimplemented(curr);
+      WASM_UNREACHABLE("unimp");
+    }
     Ref visitTry(Try* curr) {
       unimplemented(curr);
       WASM_UNREACHABLE("unimp");