From 6d7c8b12a9476b3336094ebdc88af6015ad561f3 Mon Sep 17 00:00:00 2001
From: Volker Berlin <volker.berlin@googlemail.com>
Date: Sat, 9 Nov 2019 18:59:47 +0100
Subject: [PATCH] add support for ref.is_null to wat parser

---
 src/de/inetsoftware/jwebassembly/watparser/WatParser.java   | 3 +++
 test/de/inetsoftware/jwebassembly/module/WatParserTest.java | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/src/de/inetsoftware/jwebassembly/watparser/WatParser.java b/src/de/inetsoftware/jwebassembly/watparser/WatParser.java
index 39a80f6..bd34207 100644
--- a/src/de/inetsoftware/jwebassembly/watparser/WatParser.java
+++ b/src/de/inetsoftware/jwebassembly/watparser/WatParser.java
@@ -175,6 +175,9 @@ public class WatParser extends WasmCodeBuilder {
                     case "f64.trunc":
                         addNumericInstruction( NumericOperator.trunc, ValueType.f64, javaCodePos, lineNumber );
                         break;
+                    case "ref.is_null":
+                        addNumericInstruction( NumericOperator.ifnull, ValueType.i32, javaCodePos, lineNumber );
+                        break;
                     case "table.get":
                         addTableInstruction( true, getInt( tokens, ++i), javaCodePos, lineNumber );
                         break;
diff --git a/test/de/inetsoftware/jwebassembly/module/WatParserTest.java b/test/de/inetsoftware/jwebassembly/module/WatParserTest.java
index 616e940..901dab6 100644
--- a/test/de/inetsoftware/jwebassembly/module/WatParserTest.java
+++ b/test/de/inetsoftware/jwebassembly/module/WatParserTest.java
@@ -269,6 +269,11 @@ public class WatParserTest {
         test( "f64.trunc" );
     }
 
+    @Test
+    public void ref_is_null() throws IOException {
+        test( "ref.is_null" );
+    }
+    
     @Test
     public void return_() throws IOException {
         test( "return" );