From 724f39dc189dc97bc33f7bbcd3b204eed0e250f9 Mon Sep 17 00:00:00 2001
From: Volker Berlin <volker.berlin@googlemail.com>
Date: Thu, 28 Nov 2019 20:07:51 +0100
Subject: [PATCH] Warning for multiple CATCH blocks

---
 .../jwebassembly/module/BranchManger.java           |  8 ++++++++
 .../jwebassembly/runtime/Exceptions.java            | 13 +++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/de/inetsoftware/jwebassembly/module/BranchManger.java b/src/de/inetsoftware/jwebassembly/module/BranchManger.java
index 9a5bf90..34dbdd6 100644
--- a/src/de/inetsoftware/jwebassembly/module/BranchManger.java
+++ b/src/de/inetsoftware/jwebassembly/module/BranchManger.java
@@ -741,6 +741,14 @@ class BranchManger {
         int idx;
         for( idx = 0; idx < parsedOperations.size(); idx++ ) {
             ParsedBlock parsedBlock = parsedOperations.get( idx );
+
+            if( parsedBlock.op == JavaBlockOperator.TRY ) {
+                TryCatchFinally tryCatch2 = ((TryCatchParsedBlock)parsedBlock).tryCatch;
+                if( tryCatch.getStart() == tryCatch2.getStart() && tryCatch.getEnd() == tryCatch2.getEnd() ) {
+                    throw new WasmException( "Try with multiple catch blocks can't compile currently.", null, null, tryBlock.lineNumber );
+                }
+            }
+
             if( parsedBlock.startPosition == gotoPos && parsedBlock.op == JavaBlockOperator.GOTO && parsedBlock.startPosition < parsedBlock.endPosition ) {
                 parsedOperations.remove( idx );
                 endPos = parsedBlock.endPosition;
diff --git a/test/de/inetsoftware/jwebassembly/runtime/Exceptions.java b/test/de/inetsoftware/jwebassembly/runtime/Exceptions.java
index b53d322..eefc80d 100644
--- a/test/de/inetsoftware/jwebassembly/runtime/Exceptions.java
+++ b/test/de/inetsoftware/jwebassembly/runtime/Exceptions.java
@@ -130,6 +130,19 @@ public class Exceptions extends AbstractBaseTest {
             return v;
         }
 
+//        @Export
+//        static int multiCatch() {
+//            int r;
+//            try {
+//                r = 5 / 0;
+//            } catch(RuntimeException ex ) {
+//                r = 1;
+//            } catch(Exception ex ) {
+//                r = 2;
+//            }
+//            return r;
+//        }
+
 //        @Export
 //        static int npe() {
 //            Object obj = new NullPointerException();