From 0290a5f8e4d04eef38d6a0dcdddeded7d3f5423a Mon Sep 17 00:00:00 2001
From: Volker Berlin <volker.berlin@googlemail.com>
Date: Sun, 20 Sep 2020 13:53:57 +0200
Subject: [PATCH] Add support for Wat instruction `array.len`

---
 src/de/inetsoftware/jwebassembly/watparser/WatParser.java | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/de/inetsoftware/jwebassembly/watparser/WatParser.java b/src/de/inetsoftware/jwebassembly/watparser/WatParser.java
index 731fba6..fdd5fbc 100644
--- a/src/de/inetsoftware/jwebassembly/watparser/WatParser.java
+++ b/src/de/inetsoftware/jwebassembly/watparser/WatParser.java
@@ -30,6 +30,8 @@ import de.inetsoftware.jwebassembly.module.FunctionName;
 import de.inetsoftware.jwebassembly.module.ValueTypeConvertion;
 import de.inetsoftware.jwebassembly.module.WasmCodeBuilder;
 import de.inetsoftware.jwebassembly.wasm.AnyType;
+import de.inetsoftware.jwebassembly.wasm.ArrayOperator;
+import de.inetsoftware.jwebassembly.wasm.ArrayType;
 import de.inetsoftware.jwebassembly.wasm.MemoryOperator;
 import de.inetsoftware.jwebassembly.wasm.NamedStorageType;
 import de.inetsoftware.jwebassembly.wasm.NumericOperator;
@@ -300,6 +302,11 @@ public class WatParser extends WasmCodeBuilder {
                         }
                         addStructInstruction( StructOperator.GET, typeName, fieldNameType, javaCodePos, lineNumber );
                         break;
+                    case "array.len":
+                        typeName = get( tokens, ++i );
+                        AnyType type = ((ArrayType)getTypeManager().valueOf( typeName )).getArrayType();
+                        addArrayInstruction( ArrayOperator.LEN, type, javaCodePos, lineNumber );
+                        break;
                     default:
                         throw new WasmException( "Unknown WASM token: " + tok, lineNumber );
                 }