Implemented verification for throw

git-svn-id: https://smali.googlecode.com/svn/trunk@578 55b6fa8a-2a1e-11de-a435-ffa8d773f76a

dexlib/src/main/java/org/jf/dexlib/Code/Analysis/MethodAnalyzer.java

@@ -466,6 +466,8 @@ public class MethodAnalyzer {
                 return handleFilledNewArrayRange(analyzedInstruction);
             case FILL_ARRAY_DATA:
                 return handleFillArrayData(analyzedInstruction);
+            case THROW:
+                return handleThrow(analyzedInstruction);
         }
         assert false;
         return false;
@@ -1131,6 +1133,35 @@ public class MethodAnalyzer {
         return true;
     }
 
+    private boolean handleThrow(AnalyzedInstruction analyzedInstruction) {
+        int register = ((SingleRegisterInstruction)analyzedInstruction.instruction).getRegisterA();
+
+        RegisterType registerType = analyzedInstruction.getPreInstructionRegisterType(register);
+        assert registerType != null;
+
+        if (registerType.category == RegisterType.Category.Unknown) {
+            return false;
+        }
+
+        if (registerType.category == RegisterType.Category.Null) {
+            return true;
+        }
+
+        if (registerType.category != RegisterType.Category.Reference) {
+            throw new ValidationException(String.format("Cannot use throw with non-reference type %s in register v%d",
+                    registerType.toString(), register));
+        }
+
+        assert registerType.type != null;
+
+        if (!registerType.type.extendsClass(ClassPath.getClassDef("Ljava/lang/Throwable;"))) {
+            throw new ValidationException(String.format("Cannot use throw with non-throwable type %s in register v%d",
+                    registerType.type.getClassType(), register));
+        }
+
+        return true;
+    }
+
     private static void checkRegister(RegisterType registerType, EnumSet validCategories) {
         if (!validCategories.contains(registerType.category)) {
             //TODO: add expected categories to error message