[frontend] Fix continue inside do while.

Summary: The successor node of `continue` was not correct inside the `do while`.

Reviewed By: sblackshear

Differential Revision: D5769578

fbshipit-source-id: d7b0843

infer/src/clang/cTrans.ml

@@ -1846,7 +1846,7 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
     let sil_loc = CLocation.get_sil_location stmt_info context in
     let join_node = create_node Procdesc.Node.Join_node [] sil_loc context in
     let continuation = Some {break= succ_nodes; continue= [join_node]; return_temp= false} in
-    (* set the flat to inform that we are translating a condition of a if *)
+    (* set the flag to inform that we are translating a condition of a if *)
     let continuation_cond = mk_cond_continuation outer_continuation in
     let init_incr_nodes =
       match loop_kind with
@@ -1887,8 +1887,10 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
        -> res_trans_cond.root_nodes
     in
     let body_continuation =
-      match (continuation, init_incr_nodes) with
+      match (loop_kind, continuation, init_incr_nodes) with
-      | Some c, Some (_, nodes_incr)
+      | Loops.DoWhile _, Some c, _
+       -> Some {c with continue= res_trans_cond.root_nodes}
+      | _, Some c, Some (_, nodes_incr)
        -> Some {c with continue= nodes_incr}
       | _
        -> continuation

infer/tests/codetoanalyze/cpp/frontend/loops/do_while.cpp

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2016 - present Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+int test1(bool a, bool b) {
+  int x = 0;
+  do {
+    x = x + 1;
+    if (a) {
+      x = x + 2;
+      continue;
+    } else {
+      x = x + 3;
+    }
+    x = x + 4;
+  } while (b);
+  return x;
+}

infer/tests/codetoanalyze/cpp/frontend/loops/do_while.cpp.dot

@@ -0,0 +1,61 @@
+/* @generated */
+digraph iCFG {
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_1" [label="1: Start test1\nFormals:  a:_Bool b:_Bool\nLocals:  x:int \n   DECLARE_LOCALS(&return,&x); [line 10]\n " color=yellow style=filled]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_1" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_14" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_2" [label="2: Exit test1 \n  " color=yellow style=filled]
+	
+
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_3" [label="3:  Return Stmt \n   n$0=*&x:int [line 22]\n  *&return:int=n$0 [line 22]\n " shape="box"]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_3" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_2" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_4" [label="4: + \n  " ]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_4" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_13" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_5" [label="5: Prune (true branch) \n   n$1=*&b:_Bool [line 21]\n  PRUNE((n$1 != 0), true); [line 21]\n " shape="invhouse"]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_5" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_4" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_6" [label="6: Prune (false branch) \n   n$1=*&b:_Bool [line 21]\n  PRUNE((n$1 == 0), false); [line 21]\n " shape="invhouse"]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_6" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_3" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_7" [label="7:  BinaryOperatorStmt: Assign \n   n$2=*&x:int [line 20]\n  *&x:int=(n$2 + 4) [line 20]\n " shape="box"]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_7" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_5" ;
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_7" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_6" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_8" [label="8: + \n  " ]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_8" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_7" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_9" [label="9: Prune (true branch) \n   n$3=*&a:_Bool [line 14]\n  PRUNE((n$3 != 0), true); [line 14]\n " shape="invhouse"]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_9" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_11" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_10" [label="10: Prune (false branch) \n   n$3=*&a:_Bool [line 14]\n  PRUNE((n$3 == 0), false); [line 14]\n " shape="invhouse"]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_10" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_12" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_11" [label="11:  BinaryOperatorStmt: Assign \n   n$4=*&x:int [line 15]\n  *&x:int=(n$4 + 2) [line 15]\n " shape="box"]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_11" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_5" ;
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_11" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_6" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_12" [label="12:  BinaryOperatorStmt: Assign \n   n$5=*&x:int [line 18]\n  *&x:int=(n$5 + 3) [line 18]\n " shape="box"]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_12" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_8" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_13" [label="13:  BinaryOperatorStmt: Assign \n   n$6=*&x:int [line 13]\n  *&x:int=(n$6 + 1) [line 13]\n " shape="box"]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_13" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_9" ;
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_13" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_10" ;
+"test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_14" [label="14:  DeclStmt \n   *&x:int=0 [line 11]\n " shape="box"]
+	
+
+	 "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_14" -> "test1#_Z5test1bb.7b4b302df017dfac2074bf17bf65ca2c_4" ;
+}