Validate features for types used in tables

We previously special-cased things like GC types, but switch to a more
general solution of detecting what features a table's type requires.

Author: tlively

scripts/fuzz_opt.py

@@ -363,6 +363,7 @@ def is_git_repo():
     'shared-ref_eq.wast',
     'shared-types-no-gc.wast',
     'shared-ref-i31.wast',
+    'table-type.wast',
 ]
 
 

src/wasm/wasm-validator.cpp

@@ -3845,8 +3845,7 @@ static void validateTables(Module& module, ValidationInfo& info) {
     }
   }
 
-  Type externref = Type(HeapType::ext, Nullable);
-  Type funcref = Type(HeapType::func, Nullable);
+  auto funcref = Type(HeapType::func, Nullable);
   for (auto& table : module.tables) {
     info.shouldBeTrue(table->initial <= table->max,
                       "table",
@@ -3855,17 +3854,13 @@ static void validateTables(Module& module, ValidationInfo& info) {
       table->type.isNullable(),
       "table",
       "Non-nullable reference types are not yet supported for tables");
-    if (!module.features.hasGC()) {
-      info.shouldBeTrue(table->type.isFunction() || table->type == externref,
-                        "table",
-                        "Only function reference types or externref are valid "
-                        "for table type (when GC is disabled)");
-    }
-    if (!module.features.hasGC()) {
-      info.shouldBeTrue(table->type == funcref || table->type == externref,
-                        "table",
-                        "Only funcref and externref are valid for table type "
-                        "(when gc is disabled)");
+    auto typeFeats = table->type.getFeatures();
+    if (!info.shouldBeTrue(table->type == funcref ||
+                             typeFeats <= module.features,
+                           "table",
+                           "table type requires additional features")) {
+      info.getStream(nullptr)
+        << getMissingFeaturesList(module, typeFeats) << '\n';
     }
     if (table->is64()) {
       info.shouldBeTrue(module.features.hasMemory64(),

test/lit/validation/table-type.wast

@@ -0,0 +1,12 @@
+;; Test that the features required by table types are checked
+
+;; RUN: not wasm-opt %s -all --disable-shared-everything 2>&1 | filecheck %s --check-prefix NO-SHARED
+;; RUN: wasm-opt %s -all -S -o - | filecheck %s --check-prefix SHARED
+
+;; NO-SHARED: table type requires additional features
+;; NO-SHARED: [--enable-shared-everything]
+;; SHARED: (table $t 0 0 (ref null (shared func)))
+
+(module
+  (table $t 0 0 (ref null (shared func)))
+)