fix ClassCastException

NewTransformer#findInvokeExpr attempts to cast InvokePolymorphicExpr to InvokeExpr under certain inputs, which causes a ClassCastException.

this patch is similar with

9c6cde4
9c0db1d

Author: pxb1988

dex-ir/src/main/java/com/googlecode/dex2jar/ir/stmt/VoidInvokeStmt.java

@@ -21,7 +21,8 @@
 import com.googlecode.dex2jar.ir.stmt.Stmt.E1Stmt;
 
 /**
- * Represent a void-return Invoke
+ * Represent a void-expr: the expr result is ignored.
+ * possible op type: AbstractInvokeExpr, FieldExpr, or others
  * 
  * @see ST#VOID_INVOKE
  * 

dex-ir/src/main/java/com/googlecode/dex2jar/ir/ts/NewTransformer.java

@@ -95,7 +95,7 @@ void replaceAST(IrMethod method) {
         for (Iterator<Stmt> it = method.stmts.iterator(); it.hasNext(); ) {
             Stmt p = it.next();
 
-            InvokeExpr ie = findInvokeExpr(p, null);
+            InvokeExpr ie = findInvokeExpr(p);
 
             if (ie != null) {
                 if ("<init>".equals(ie.getName()) && "V".equals(ie.getRet())) {
@@ -153,7 +153,7 @@ void replace0(IrMethod method, Map<Local, TObject> init, int size) {
                     }
                 }
             }
-            InvokeExpr ie = findInvokeExpr(obj.invokeStmt, null);
+            InvokeExpr ie = findInvokeExpr(obj.invokeStmt);
             Value[] orgOps = ie.getOps();
             Value[] nOps = Arrays.copyOfRange(orgOps, 1, orgOps.length);
             InvokeExpr invokeNew = Exprs.nInvokeNew(nOps, ie.getArgs(), ie.getOwner());
@@ -352,13 +352,17 @@ void use(Local local) {
         }
     }
 
-    InvokeExpr findInvokeExpr(Stmt p, InvokeExpr ie) {
+    InvokeExpr findInvokeExpr(Stmt p) {
+        InvokeExpr ie = null;
         if (p.st == ASSIGN) {
             if (p.getOp2().vt == INVOKE_SPECIAL) {
                 ie = (InvokeExpr) p.getOp2();
             }
         } else if (p.st == VOID_INVOKE) {
-            ie = (InvokeExpr) p.getOp();
+            Value op = p.getOp();
+            if (op instanceof InvokeExpr) {
+                ie = (InvokeExpr) op;
+            }
         }
         return ie;
     }

dex-ir/src/main/java/com/googlecode/dex2jar/ir/ts/VoidInvokeTransformer.java

@@ -17,6 +17,7 @@
 package com.googlecode.dex2jar.ir.ts;
 
 import com.googlecode.dex2jar.ir.IrMethod;
+import com.googlecode.dex2jar.ir.expr.AbstractInvokeExpr;
 import com.googlecode.dex2jar.ir.expr.Local;
 import com.googlecode.dex2jar.ir.expr.Value;
 import com.googlecode.dex2jar.ir.stmt.Stmt;
@@ -49,20 +50,13 @@ public boolean transformReportChanged(IrMethod method) {
             if (p.st == Stmt.ST.ASSIGN && p.getOp1().vt == Value.VT.LOCAL) {
                 Local left = (Local) p.getOp1();
                 if (reads[left._ls_index] == 0) {
-                    switch (p.getOp2().vt) {
-                    case INVOKE_INTERFACE:
-                    case INVOKE_NEW:
-                    case INVOKE_SPECIAL:
-                    case INVOKE_STATIC:
-                    case INVOKE_VIRTUAL:
+                    Value op2 = p.getOp2();
+                    if (op2 instanceof AbstractInvokeExpr) {
                         method.locals.remove(left);
-                        Stmt nVoidInvoke = Stmts.nVoidInvoke(p.getOp2());
+                        Stmt nVoidInvoke = Stmts.nVoidInvoke(op2);
                         method.stmts.replace(p, nVoidInvoke);
                         p = nVoidInvoke;
                         changed = true;
-                        break;
-                    default:
-                        break;
                     }
                 }
             }