wast-parser.cc: disallow exception tag unless exceptions enabled (#2110)

Author: keithw

src/wast-parser.cc

@@ -1346,6 +1346,10 @@ Result WastParser::ParseElemModuleField(Module* module) {
 
 Result WastParser::ParseTagModuleField(Module* module) {
   WABT_TRACE(ParseTagModuleField);
+  if (!options_->features.exceptions_enabled()) {
+    Error(Consume().loc, "tag not allowed");
+    return Result::Error;
+  }
   EXPECT(Lpar);
   EXPECT(Tag);
   std::string name;

test/dump/tag.txt

@@ -1,5 +1,5 @@
 ;;; TOOL: run-objdump
-;;; ARGS0: -v
+;;; ARGS0: -v --enable-exceptions
 ;;; ARGS1: -x
 (module
   (tag)

test/regress/regress-2110.txt

@@ -0,0 +1,11 @@
+;;; TOOL: wat2wasm
+;;; ERROR: 1
+(module
+  (tag $e0 (param i32))
+)
+
+(;; STDERR ;;;
+out/test/regress/regress-2110.txt:4:3: error: tag not allowed
+  (tag $e0 (param i32))
+  ^
+;;; STDERR ;;)