[C] Fix issue with enum initialization lists

Summary: Fail quietly to translate enum initializer lists.

Reviewed By: grievejia

Differential Revision: D5574903

fbshipit-source-id: 6d3c4ea

infer/src/clang/cTrans.ml

@@ -1950,7 +1950,11 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
     let init_field field_exp_typ stmt =
       init_expr_trans trans_state field_exp_typ stmt_info (Some stmt)
     in
-    List.map2_exn field_exps stmts ~f:init_field
+    match List.map2 field_exps stmts ~f:init_field with
+    | Ok result
+     -> result
+    | Unequal_lengths
+     -> (* This can happen with union initializers. Skip them for now *) []
 
   and initListExpr_builtin_trans trans_state stmt_info stmts var_exp var_typ =
     let stmt = match stmts with [s] -> s | _ -> assert false in

infer/tests/codetoanalyze/c/frontend/initialization/enum_initlistexpr.c

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2017 - 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.
+ */
+union U {
+  int f1;
+  int f2[3];
+};
+
+void union_initialize_FIXME() {
+  union U set_f1 = {.f1 = 2};
+  union U set_f2 = {.f2 = {1, 2, 3}};
+  union U set_f1_implicit = {1};
+}

infer/tests/codetoanalyze/c/frontend/initialization/enum_initlistexpr.c.dot

@@ -0,0 +1,10 @@
+/* @generated */
+digraph iCFG {
+"union_initialize_FIXME.324b85335f5d2e418a28cb97eb896f20_1" [label="1: Start union_initialize_FIXME\nFormals: \nLocals:  set_f1_implicit:U set_f2:U set_f1:U \n   DECLARE_LOCALS(&return,&set_f1_implicit,&set_f2,&set_f1); [line 14]\n " color=yellow style=filled]
+	
+
+	 "union_initialize_FIXME.324b85335f5d2e418a28cb97eb896f20_1" -> "union_initialize_FIXME.324b85335f5d2e418a28cb97eb896f20_2" ;
+"union_initialize_FIXME.324b85335f5d2e418a28cb97eb896f20_2" [label="2: Exit union_initialize_FIXME \n  " color=yellow style=filled]
+	
+
+}