[frontend] Add field for property to the type environment in ObjC

Summary:
This diff adds fields for ObjC properties to the type environment.  For example,

```
property type fieldname;
```

when the property name is "fieldname", this diff adds a struct field of the same name.

The missing type information were problematic in inferbo, since its semantics depend on types.

Reviewed By: ezgicicek

Differential Revision: D28421998

fbshipit-source-id: e24059846

infer/src/clang/cField_decl.ml

@@ -75,15 +75,16 @@ let get_fields qual_type_to_sil_type tenv class_tname decl_list =
   in
   let rec get_field fields decl =
     match decl with
-    | ObjCPropertyDecl (_, _, obj_c_property_decl_info) -> (
-        let ivar_decl_ref = obj_c_property_decl_info.Clang_ast_t.opdi_ivar_decl in
-        let property_attributes = obj_c_property_decl_info.Clang_ast_t.opdi_property_attributes in
-        match CAst_utils.get_decl_opt_with_decl_ref_opt ivar_decl_ref with
+    | ObjCPropertyDecl (_, name_info, {opdi_qual_type; opdi_ivar_decl; opdi_property_attributes}) ->
+        let name_info, qual_type =
+          match CAst_utils.get_decl_opt_with_decl_ref_opt opdi_ivar_decl with
           | Some (ObjCIvarDecl (_, name_info, qual_type, _, _)) ->
-            let field = get_sil_field name_info qual_type property_attributes in
-            CGeneral_utils.add_no_duplicates_fields field fields
+              (name_info, qual_type)
           | _ ->
-            fields )
+              (name_info, opdi_qual_type)
+        in
+        let field = get_sil_field name_info qual_type opdi_property_attributes in
+        CGeneral_utils.add_no_duplicates_fields field fields
     | ObjCPropertyImplDecl (_, obj_c_property_impl_decl_info) -> (
         let property_decl_opt = obj_c_property_impl_decl_info.Clang_ast_t.opidi_property_decl in
         match CAst_utils.get_decl_opt_with_decl_ref_opt property_decl_opt with
@@ -114,10 +115,7 @@ let add_missing_fields tenv class_name missing_fields =
       ()
 
 
-let modelled_fields_in_classes =
-  [ ("NSData", "_bytes", Typ.mk (Tptr (StdTyp.void, Typ.Pk_pointer)))
-  ; ("NSArray", "elementData", Typ.mk (Tint Typ.IInt)) ]
-
+let modelled_fields_in_classes = [("NSArray", "elementData", Typ.mk (Tint Typ.IInt))]
 
 let modelled_field class_name_info =
   let modelled_field_in_class res (class_name, field_name, typ) =

infer/tests/codetoanalyze/objc/frontend/property/aclass.m.dot

@@ -7,7 +7,7 @@ digraph cfg {
 "dealloc#AClass#instance.5339a8e9aec421a1f58ba25e08faeb6b_2" [label="2: Exit AClass.dealloc \n  " color=yellow style=filled]
 	
 
-"dealloc#AClass#instance.5339a8e9aec421a1f58ba25e08faeb6b_3" [label="3:  Call dealloc \n  " shape="box"]
+"dealloc#AClass#instance.5339a8e9aec421a1f58ba25e08faeb6b_3" [label="3:  Call dealloc \n   n$0=*&self:AClass* [line 18, column 1]\n  n$1=*n$0.aDynValue:NSObject* [line 18, column 1]\n  n$2=_fun_NSObject.dealloc(n$1:NSObject*) [line 18, column 1]\n " shape="box"]
 	
 
 	 "dealloc#AClass#instance.5339a8e9aec421a1f58ba25e08faeb6b_3" -> "dealloc#AClass#instance.5339a8e9aec421a1f58ba25e08faeb6b_2" ;

infer/tests/codetoanalyze/objc/performance/MyData.h

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+#import <Foundation/Foundation.h>
+
+@interface MyData : NSObject<NSCopying>
+
+@property(nonatomic, readonly, copy) NSString* name;
+
+@end

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

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+#import "MyData.h"
+
+@implementation MyData
+
+@synthesize name;
+
+@end

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

@@ -4,6 +4,8 @@ ${XCODE_ISYSROOT}/System/Library/Frameworks/Foundation.framework/Headers/NSArray
 ${XCODE_ISYSROOT}/System/Library/Frameworks/Foundation.framework/Headers/NSArray.h, NSArray.indexOfObject:inSortedRange:options:usingComparator:[objc_blocknsarray_binary_search_log_FN_1], 0,  OnUIThread:false, []
 ${XCODE_ISYSROOT}/System/Library/Frameworks/Foundation.framework/Headers/NSAttributedString.h, NSAttributedString.enumerateAttribute:inRange:options:usingBlock:[objc_blockenumerateAttribute_linear_2], 0,  OnUIThread:false, []
 ${XCODE_ISYSROOT}/System/Library/Frameworks/Foundation.framework/Headers/NSAttributedString.h, NSAttributedString.enumerateAttribute:inRange:options:usingBlock:[objc_blockenumerateAttribute_quadratic_1], 0,  OnUIThread:false, []
+codetoanalyze/objc/performance/MyData.h, MyData.name, 3,  OnUIThread:false, []
+codetoanalyze/objc/performance/MyData.m, MyData.dealloc, 3,  OnUIThread:false, []
 codetoanalyze/objc/performance/MyEnumerator.m, MyEnumerator.dealloc, 0,  OnUIThread:false, []
 codetoanalyze/objc/performance/MyEnumerator.m, MyEnumerator.nextObject, 5 + 3 ⋅ self->n.ub + 3 ⋅ (1+max(0, self->n.ub)),  OnUIThread:false, [{1+max(0, self->n.ub)},Loop,{self->n.ub},Loop]
 codetoanalyze/objc/performance/NSArray.m, MyBlock.call_enumerate_via_block_param_quadratic::, 4 + 3 ⋅ size × x->elements.length.ub + 2 ⋅ x->elements.length.ub + 2 ⋅ x->elements.length.ub × (1+max(0, size)),  OnUIThread:false, [{1+max(0, size)},Loop,{x->elements.length.ub},Modeled call to enumerateObjectsUsingBlock:,{x->elements.length.ub},Modeled call to enumerateObjectsUsingBlock:,{size},Loop]
@@ -248,6 +250,7 @@ codetoanalyze/objc/performance/mutable_copy_test.m, MyMutableObj.mutableCopyWith
 codetoanalyze/objc/performance/mutable_copy_test.m, MyMutableObj.objects, 5,  OnUIThread:false, []
 codetoanalyze/objc/performance/mutable_copy_test.m, MyMutableObj.setMObjects:, 3,  OnUIThread:false, []
 codetoanalyze/objc/performance/mutable_copy_test.m, loop_over_mutable_copy_linear, 31 + 3 ⋅ b->_mObjects->elements.length.ub + 3 ⋅ (b->_mObjects->elements.length.ub + 1),  OnUIThread:false, [{b->_mObjects->elements.length.ub + 1},Loop,{b->_mObjects->elements.length.ub},Loop]
+codetoanalyze/objc/performance/property_test.m, getter_property_linear, 7 + 3 ⋅ data->name.length.ub + 3 ⋅ (data->name.length.ub + 1),  OnUIThread:false, [{data->name.length.ub + 1},Loop,{data->name.length.ub},Loop]
 codetoanalyze/objc/performance/purity.m, loop, 6006 + 1000 ⋅ |fun_ptr|,  OnUIThread:false, []
 codetoanalyze/objc/performance/struct_test.m, __infer_globals_initializer_mSpecs, 4,  OnUIThread:false, []
 codetoanalyze/objc/performance/struct_test.m, const_struct_field_read_constant, 9,  OnUIThread:false, []

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

@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+#import <Foundation/Foundation.h>
+#import "MyData.h"
+
+void getter_property_linear(MyData* data) {
+  NSString* dn = data.name;
+  for (int i = 0; i < dn.length; i++) {
+  }
+}