From 8c12f5a3c971294343db053916420330b69b7665 Mon Sep 17 00:00:00 2001
From: Volker Berlin <volker.berlin@googlemail.com>
Date: Sat, 1 Feb 2020 16:49:52 +0100
Subject: [PATCH] implement "instanceof", WIP

---
 .../module/JavaMethodWasmCodeBuilder.java         |  8 ++++++--
 .../module/WasmStructInstruction.java             |  3 +++
 .../jwebassembly/wasm/StructOperator.java         |  3 ++-
 .../jwebassembly/runtime/RuntimeErrors.java       | 15 ++++++++++++++-
 4 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/src/de/inetsoftware/jwebassembly/module/JavaMethodWasmCodeBuilder.java b/src/de/inetsoftware/jwebassembly/module/JavaMethodWasmCodeBuilder.java
index f69faec..15fec3d 100644
--- a/src/de/inetsoftware/jwebassembly/module/JavaMethodWasmCodeBuilder.java
+++ b/src/de/inetsoftware/jwebassembly/module/JavaMethodWasmCodeBuilder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2018 - 2019 Volker Berlin (i-net software)
+ * Copyright 2018 - 2020 Volker Berlin (i-net software)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -654,7 +654,11 @@ class JavaMethodWasmCodeBuilder extends WasmCodeBuilder {
                         addBlockInstruction( WasmBlockOperator.THROW, null, codePos, lineNumber );
                         break;
                     //TODO case 192: // checkcast
-                    //TODO case 193: // instanceof
+                    case 193: // instanceof
+                        idx = byteCode.readUnsignedShort();
+                        name = ((ConstantClass)constantPool.get( idx )).getName();
+                        addStructInstruction( StructOperator.INSTANCEOF, name, null, codePos, lineNumber );
+                        break;
                     case 194: // monitorenter
                         addBlockInstruction( WasmBlockOperator.MONITOR_ENTER, null, codePos, lineNumber );
                         break;
diff --git a/src/de/inetsoftware/jwebassembly/module/WasmStructInstruction.java b/src/de/inetsoftware/jwebassembly/module/WasmStructInstruction.java
index 4aa84a7..ec9a420 100644
--- a/src/de/inetsoftware/jwebassembly/module/WasmStructInstruction.java
+++ b/src/de/inetsoftware/jwebassembly/module/WasmStructInstruction.java
@@ -208,6 +208,8 @@ class WasmStructInstruction extends WasmInstruction {
                 return fieldName.getType();
             case SET:
                 return null;
+            case INSTANCEOF:
+                return ValueType.i32; // a boolean value
             default:
                 throw new WasmException( "Unknown array operation: " + op, -1 );
         }
@@ -220,6 +222,7 @@ class WasmStructInstruction extends WasmInstruction {
     int getPopCount() {
         switch( op ) {
             case GET:
+            case INSTANCEOF:
                 return 1;
             case SET:
                 return 2;
diff --git a/src/de/inetsoftware/jwebassembly/wasm/StructOperator.java b/src/de/inetsoftware/jwebassembly/wasm/StructOperator.java
index e20b680..d086e98 100644
--- a/src/de/inetsoftware/jwebassembly/wasm/StructOperator.java
+++ b/src/de/inetsoftware/jwebassembly/wasm/StructOperator.java
@@ -1,5 +1,5 @@
 /*
-   Copyright 2018 Volker Berlin (i-net software)
+   Copyright 2018 - 2020 Volker Berlin (i-net software)
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
@@ -27,4 +27,5 @@ public enum StructOperator {
     GET,
     SET,
     NULL,
+    INSTANCEOF,
 }
\ No newline at end of file
diff --git a/test/de/inetsoftware/jwebassembly/runtime/RuntimeErrors.java b/test/de/inetsoftware/jwebassembly/runtime/RuntimeErrors.java
index bf666b1..c50d4ac 100644
--- a/test/de/inetsoftware/jwebassembly/runtime/RuntimeErrors.java
+++ b/test/de/inetsoftware/jwebassembly/runtime/RuntimeErrors.java
@@ -114,7 +114,6 @@ public class RuntimeErrors {
         }
     }
 
-
     @Test
     public void interfaceCall() throws IOException {
         compileErrorTest( "Interface calls are not supported.", InterfaceMethod.class );
@@ -127,4 +126,18 @@ public class RuntimeErrors {
             return list.size();
         }
     }
+
+
+    @Test
+    public void instanceofCall() throws IOException {
+        compileErrorTest( "Unknown operator: INSTANCEOF", InstanceofMethod.class );
+    }
+
+    static class InstanceofMethod {
+        @Export
+        static boolean runnable() {
+            Object obj = new Object();
+            return obj instanceof Integer;
+        }
+    }
 }