[GC] RefIsNull => RefIs. (#3516)

This internal refactoring prepares us for ref.is_func/data/i31, by renaming
the node and adding an "op" field. For now that field must always be "Null"
which means it is a ref.is_null.

This adjusts the C API to match the new IR shape. The high-level JS API
is unchanged.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/wasm/wasm-validator.cpp b/src/wasm/wasm-validator.cpp
index 7cddf5a86..8def0e529 100644
--- a/src/wasm/wasm-validator.cpp
+++ b/src/wasm/wasm-validator.cpp
@@ -331,7 +331,7 @@ public:
   void visitMemorySize(MemorySize* curr);
   void visitMemoryGrow(MemoryGrow* curr);
   void visitRefNull(RefNull* curr);
-  void visitRefIsNull(RefIsNull* curr);
+  void visitRefIs(RefIs* curr);
   void visitRefFunc(RefFunc* curr);
   void visitRefEq(RefEq* curr);
   void visitTry(Try* curr);
@@ -1981,14 +1981,14 @@ void FunctionValidator::visitRefNull(RefNull* curr) {
     curr->type.isNullable(), curr, "ref.null types must be nullable");
 }
 
-void FunctionValidator::visitRefIsNull(RefIsNull* curr) {
+void FunctionValidator::visitRefIs(RefIs* curr) {
   shouldBeTrue(getModule()->features.hasReferenceTypes(),
                curr,
-               "ref.is_null requires reference-types to be enabled");
+               "ref.is_* requires reference-types to be enabled");
   shouldBeTrue(curr->value->type == Type::unreachable ||
                  curr->value->type.isRef(),
                curr->value,
-               "ref.is_null's argument should be a reference type");
+               "ref.is_*'s argument should be a reference type");
 }
 
 void FunctionValidator::visitRefFunc(RefFunc* curr) {