Replace `RefIs` with `RefIsNull` (#5401)

* Replace `RefIs` with `RefIsNull`

The other `ref.is*` instructions are deprecated and expressible in terms of
`ref.test`. Update binary and text parsing to parse those instructions as
`RefTest` expressions. Also update the printing and emitting of `RefTest`
expressions to emit the legacy instructions for now to minimize test changes and
make this a mostly non-functional change. Since `ref.is_null` is the only
`RefIs` instruction left, remove the `RefIsOp` field and rename the expression
class to `RefIsNull`.

The few test changes are due to the fact that `ref.is*` instructions are now
subject to `ref.test` validation, and in particular it is no longer valid to
perform a `ref.is_func` on a value outside of the `func` type hierarchy.

1 files changed, 16 insertions, 37 deletions

diff --git a/test/binaryen.js/expressions.js b/test/binaryen.js/expressions.js
index c0bc402a0..ee55ee90b 100644
--- a/test/binaryen.js/expressions.js
+++ b/test/binaryen.js/expressions.js
@@ -1417,51 +1417,30 @@ console.log("# MemoryFill");
   module.dispose();
 })();
 
-console.log("# RefIs");
-(function testRefIs() {
+console.log("# RefIsNull");
+(function testRefIsNull() {
   const module = new binaryen.Module();
 
-  var op = binaryen.Operations.RefIsNull;
   var value = module.local.get(1, binaryen.externref);
-  const theRefIs = binaryen.RefIs(module.ref.is_null(value));
-  assert(theRefIs instanceof binaryen.RefIs);
-  assert(theRefIs instanceof binaryen.Expression);
-  assert(theRefIs.op === op);
-  assert(theRefIs.value === value);
-  assert(theRefIs.type === binaryen.i32);
-
-  theRefIs.op = op = binaryen.Operations.RefIsFunc;
-  assert(theRefIs.op === op);
-  theRefIs.op = op = binaryen.Operations.RefIsNull;
-  theRefIs.value = value = module.local.get(2, binaryen.externref);
-  assert(theRefIs.value === value);
-  theRefIs.type = binaryen.f64;
-  theRefIs.finalize();
-  assert(theRefIs.type === binaryen.i32);
-
-  console.log(theRefIs.toText());
+  const theRefIsNull = binaryen.RefIsNull(module.ref.is_null(value));
+  assert(theRefIsNull instanceof binaryen.RefIsNull);
+  assert(theRefIsNull instanceof binaryen.Expression);
+  assert(theRefIsNull.value === value);
+  assert(theRefIsNull.type === binaryen.i32);
+
+  theRefIsNull.value = value = module.local.get(2, binaryen.externref);
+  assert(theRefIsNull.value === value);
+  theRefIsNull.type = binaryen.f64;
+  theRefIsNull.finalize();
+  assert(theRefIsNull.type === binaryen.i32);
+
+  console.log(theRefIsNull.toText());
   assert(
-    theRefIs.toText()
+    theRefIsNull.toText()
     ==
     "(ref.is_null\n (local.get $2)\n)\n"
   );
 
-  assert(
-    binaryen.RefIs(module.ref.is_func(value)).toText()
-    ==
-    "(ref.is_func\n (local.get $2)\n)\n"
-  );
-  assert(
-    binaryen.RefIs(module.ref.is_data(value)).toText()
-    ==
-    "(ref.is_data\n (local.get $2)\n)\n"
-  );
-  assert(
-    binaryen.RefIs(module.ref.is_i31(value)).toText()
-    ==
-    "(ref.is_i31\n (local.get $2)\n)\n"
-  );
-
   module.dispose();
 })();