From f2f13498d23561da28d26872b58dcf12bc623e1a Mon Sep 17 00:00:00 2001
From: Sebastian Nickels <sn1c@protonmail.ch>
Date: Sat, 17 Aug 2019 21:26:15 +0200
Subject: [PATCH] Added a check for outputs used as inputs in
 ArchitectureSupportChecker

---
 .../generator/ArchitectureSupportChecker.java   | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/main/java/de/monticore/lang/monticar/cnnarch/generator/ArchitectureSupportChecker.java b/src/main/java/de/monticore/lang/monticar/cnnarch/generator/ArchitectureSupportChecker.java
index 0a3af29..eb98869 100644
--- a/src/main/java/de/monticore/lang/monticar/cnnarch/generator/ArchitectureSupportChecker.java
+++ b/src/main/java/de/monticore/lang/monticar/cnnarch/generator/ArchitectureSupportChecker.java
@@ -107,12 +107,27 @@ public abstract class ArchitectureSupportChecker {
         return true;
     }
 
+    protected boolean checkOutputAsInput(ArchitectureSymbol architecture) {
+        for (SerialCompositeElementSymbol stream : architecture.getStreams()) {
+            for (ArchitectureElementSymbol element : stream.getFirstAtomicElements()) {
+                if (element.isOutput()) {
+                    Log.error("This cnn architecture uses an output as an input, which is currently not supported by the code generator."
+                            , architecture.getSourcePosition());
+                    return false;
+                }
+            }
+        }
+
+        return true;
+    }
+
     public boolean check(ArchitectureSymbol architecture) {
         return checkMultipleStreams(architecture)
                 && checkMultipleInputs(architecture)
                 && checkMultipleOutputs(architecture)
                 && checkMultiDimensionalOutput(architecture)
                 && checkConstants(architecture)
-                && checkLayerVariables(architecture);
+                && checkLayerVariables(architecture)
+                && checkOutputAsInput(architecture);
     }
 }
-- 
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