core: prevent ClassCastException in StringBuilder chain converter

2015-01-12 23:26:03 +03:00
parent 84edfac8fa
commit b4767626d9
1 changed files with 8 additions and 3 deletions
@@ -174,9 +174,14 @@ public class SimplifyVisitor extends AbstractVisitor {
                      iwa = (InsnWrapArg)argInsn.getArg(0);
                      argInd = 3;  // Cause for loop below to skip to after the constructor
                    } else {
-                      ConstStringNode csn = (ConstStringNode)chain.get(0);
-                      iwa = new InsnWrapArg(csn);
-                      argInd = 2;  // Cause for loop below to skip to after the constructor
+	                    InsnNode firstNode = chain.get(0);
+	                    if (firstNode instanceof ConstStringNode) {
+		                    ConstStringNode csn = (ConstStringNode) firstNode;
+		                    iwa = new InsnWrapArg(csn);
+		                    argInd = 2;  // Cause for loop below to skip to after the constructor
+	                    } else {
+		                    return null;
+	                    }
                    }
                    concatInsn.addArg(iwa);
                  }