[java-dfa] Stop analysis completely after impossible cast outside of try-catch

Improves UnreachableCodeInspection

GitOrigin-RevId: 87a98ad8c3c0ca544e86c9bb1c98267dc939a728

java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/java/inst/TypeCastInstruction.java

@@ -103,7 +103,9 @@ public class TypeCastInstruction extends ExpressionPushingInstruction {
         }
       }
 
-      result.add(nextState(interpreter, stateBefore));
+      if (castPossible) {
+        result.add(nextState(interpreter, stateBefore));
+      }
       pushResult(interpreter, stateBefore, stateBefore.pop());
     }
     UnsatisfiedConditionProblem problem = getConditionProblem();

java/java-tests/testData/inspection/dataFlow/unreachableCode/FailingCast.java

@@ -0,0 +1,8 @@
+
+class Test {
+  public static void main(String[] args) {
+    Object o = "12";
+    Integer a = (Integer) o;
+    <warning descr="Unreachable code">System.out.println("1");</warning>
+  }
+}

java/java-tests/testSrc/com/intellij/java/codeInspection/dataFlow/UnreachableCodeInspectionTest.java

@@ -39,6 +39,8 @@ public class UnreachableCodeInspectionTest extends LightJavaCodeInsightFixtureTe
   public void testCatchLinkageError() { doTest(); }
   
   public void testLambdaCast() { doTest(); }
+  
+  public void testFailingCast() { doTest(); }
 
   private void doTest() {
     myFixture.configureByFile(getTestName(false) + ".java");