Bug 1730188 - wasm: Fix Table.type method to report type as RefType instead of TableRepr. r=lth

We should report the precise RefType that a table has, not the
flattened TableRepr.

Depends on D125225

Differential Revision: https://phabricator.services.mozilla.com/D125226

js/src/wasm/WasmJS.cpp

@@ -3076,26 +3076,14 @@ static bool ToTableIndex(JSContext* cx, HandleValue v, const Table& table,
 #ifdef ENABLE_WASM_TYPE_REFLECTIONS
 /* static */
 bool WasmTableObject::typeImpl(JSContext* cx, const CallArgs& args) {
-  Rooted<IdValueVector> props(cx, IdValueVector(cx));
   Table& table = args.thisv().toObject().as<WasmTableObject>().table();
 
-  const char* elementValue;
-  switch (table.repr()) {
-    case TableRepr::Func:
-      elementValue = "funcref";
-      break;
-    case TableRepr::Ref:
-      elementValue = "externref";
-      break;
-    default:
-      MOZ_CRASH("Should not happen");
-  }
-  JSString* elementString = UTF8CharsToString(cx, elementValue);
-  if (!elementString) {
-    return false;
-  }
-  if (!props.append(IdValuePair(NameToId(cx->names().element),
-                                StringValue(elementString)))) {
+  Rooted<IdValueVector> props(cx, IdValueVector(cx));
+
+  RootedString elementType(
+      cx, UTF8CharsToString(cx, ToString(table.elemType()).get()));
+  if (!elementType || !props.append(IdValuePair(NameToId(cx->names().element),
+                                                StringValue(elementType)))) {
     return false;
   }
 

js/src/wasm/WasmValType.cpp

@@ -68,6 +68,8 @@ bool wasm::ToValType(JSContext* cx, HandleValue v, ValType* out) {
   return true;
 }
 
+UniqueChars wasm::ToString(RefType type) { return ToString(ValType(type)); }
+
 UniqueChars wasm::ToString(ValType type) {
   const char* literal = nullptr;
   switch (type.kind()) {

js/src/wasm/WasmValType.h

@@ -725,6 +725,8 @@ static inline jit::MIRType ToMIRType(const Maybe<ValType>& t) {
 
 extern bool ToValType(JSContext* cx, HandleValue v, ValType* out);
 
+extern UniqueChars ToString(RefType type);
+
 extern UniqueChars ToString(ValType type);
 
 extern UniqueChars ToString(const Maybe<ValType>& type);