[frontend] Treat allocWithZone: same as alloc

Summary:
`allocWithZone` exists for historical reasons; memory zones are no longer used by Objective-C. Therefore, we treat it like `alloc`.

https://developer.apple.com/documentation/objectivec/nsobject/1571945-allocwithzone

Reviewed By: skcho

Differential Revision: D24137019

fbshipit-source-id: aac321322

infer/src/clang/cFrontend_config.ml

@@ -25,6 +25,8 @@ type decl_trans_context = [`DeclTraversal | `Translation | `CppLambdaExprTransla
 
 let alloc = "alloc"
 
+let allocWithZone = "allocWithZone:"
+
 let arrayWithObjects_count = "arrayWithObjects:count:"
 
 let dictionaryWithObjects_forKeys_count = "dictionaryWithObjects:forKeys:count:"

infer/src/clang/cFrontend_config.mli

@@ -25,6 +25,8 @@ type decl_trans_context = [`DeclTraversal | `Translation | `CppLambdaExprTransla
 
 val alloc : string
 
+val allocWithZone : string
+
 val arrayWithObjects_count : string
 
 val dictionaryWithObjects_forKeys_count : string

infer/src/clang/cTrans.ml

@@ -1298,7 +1298,12 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
         Some (mk_trans_result (exp, typ) empty_control)
     else if
       (* alloc or new *)
-      String.equal selector CFrontend_config.alloc || String.equal selector CFrontend_config.new_str
+      String.equal selector CFrontend_config.alloc
+      (* allocWithZone is like alloc: This method exists for
+         historical reasons; memory zones are no longer used by
+         Objective-C. *)
+      || String.equal selector CFrontend_config.allocWithZone
+      || String.equal selector CFrontend_config.new_str
     then
       match receiver_kind with
       | `Class qual_type ->

infer/src/clang/cTrans_utils.ml

@@ -363,7 +363,10 @@ let new_or_alloc_trans trans_state loc stmt_info qual_type class_name_opt select
     | None ->
         CType.objc_classname_of_type function_type
   in
-  if String.equal selector CFrontend_config.alloc then
+  if
+    String.equal selector CFrontend_config.alloc
+    || String.equal selector CFrontend_config.allocWithZone
+  then
     alloc_trans trans_state ~alloc_builtin:BuiltinDecl.__objc_alloc_no_fail loc stmt_info
       function_type
   else if String.equal selector CFrontend_config.new_str then

infer/tests/codetoanalyze/objc/performance/NSDictionary.m

@@ -25,6 +25,14 @@ void nsdictionary_init_with_dictionary_linear(NSDictionary* dict) {
   }
 }
 
+void nsdictionary_alloc_with_zone_init_with_dictionary_linear(
+    NSDictionary* dict, NSZone* zone) {
+  NSDictionary* copy_dict =
+      [[NSDictionary allocWithZone:zone] initWithDictionary:dict];
+  for (int i = 0; i < [copy_dict allValues].count; i++) {
+  }
+}
+
 NSDictionary* nsdictionary_dictionary_with_objects_linear(int n_entries) {
   NSDictionary* asciiDict;
   NSString* keyArray[n_entries];

infer/tests/codetoanalyze/objc/performance/cost-issues.exp

@@ -31,6 +31,7 @@ codetoanalyze/objc/performance/NSArray.m, objc_blocknsarray_binary_search_log_FN
 codetoanalyze/objc/performance/NSDictionary.m, nsdictionary_all_keys_linear1, 3 + 3 ⋅ dict->elements.length.ub + 4 ⋅ (dict->elements.length.ub + 1),  OnUIThread:false, [{dict->elements.length.ub + 1},Loop,{dict->elements.length.ub},Loop]
 codetoanalyze/objc/performance/NSDictionary.m, nsdictionary_all_keys_linear2, 6 + 3 ⋅ dict->elements.length.ub + 3 ⋅ (dict->elements.length.ub + 1),  OnUIThread:false, [{dict->elements.length.ub + 1},Loop,{dict->elements.length.ub},Loop]
 codetoanalyze/objc/performance/NSDictionary.m, nsdictionary_all_values_linear, 3 + 3 ⋅ dict->elements.length.ub + 4 ⋅ (dict->elements.length.ub + 1),  OnUIThread:false, [{dict->elements.length.ub + 1},Loop,{dict->elements.length.ub},Loop]
+codetoanalyze/objc/performance/NSDictionary.m, nsdictionary_alloc_with_zone_init_with_dictionary_linear, 7 + 3 ⋅ dict->elements.length.ub + 4 ⋅ (dict->elements.length.ub + 1),  OnUIThread:false, [{dict->elements.length.ub + 1},Loop,{dict->elements.length.ub},Loop]
 codetoanalyze/objc/performance/NSDictionary.m, nsdictionary_dictionary_constant, 13,  OnUIThread:false, []
 codetoanalyze/objc/performance/NSDictionary.m, nsdictionary_dictionary_with_objects_linear, 14 + 15 ⋅ n_entries + 3 ⋅ n_entries + 2 ⋅ (1+max(0, n_entries)) + 4 ⋅ (1+max(0, n_entries)),  OnUIThread:false, [{1+max(0, n_entries)},Loop,{1+max(0, n_entries)},Loop,{n_entries},Loop,{n_entries},Loop]
 codetoanalyze/objc/performance/NSDictionary.m, nsdictionary_enumerate_call_constant, 65,  OnUIThread:false, []