[biabduction] Add to the skip reason when the method comes from a protocol

Reviewed By: jvillard

Differential Revision: D7877741

fbshipit-source-id: 5c5d8fd

infer/src/IR/Typ.ml

@@ -359,6 +359,8 @@ module Name = struct
 
   let is_class = function CppClass _ | JavaClass _ | ObjcClass _ -> true | _ -> false
 
+  let is_objc_protocol name = match name with ObjcProtocol _ -> true | _ -> false
+
   let is_same_type t1 t2 =
     match (t1, t2) with
     | CStruct _, CStruct _
@@ -878,6 +880,10 @@ module Procname = struct
         t
 
 
+  let is_method_in_objc_protocol t =
+    match t with ObjC_Cpp osig -> Name.is_objc_protocol osig.class_name | _ -> false
+
+
   let rec objc_cpp_replace_method_name t (new_method_name: string) =
     match t with
     | ObjC_Cpp osig ->

infer/src/IR/Typ.mli

@@ -508,6 +508,8 @@ module Procname : sig
   (** Replace the class name component of a procedure name.
       In case of Java, replace package and class name. *)
 
+  val is_method_in_objc_protocol : t -> bool
+
   val to_string : t -> string
   (** Convert a proc name to a string for the user to see. *)
 

infer/src/biabduction/SymExec.ml

@@ -358,13 +358,22 @@ let check_inherently_dangerous_function caller_pname callee_pname =
     Reporting.log_warning_deprecated caller_pname exn
 
 
-let reason_to_skip callee_summary : string option =
-  let attributes = Specs.get_attributes callee_summary in
-  if attributes.ProcAttributes.is_abstract then Some "abstract method"
-  else if not attributes.ProcAttributes.is_defined then Some "method has no implementation"
-  else if List.is_empty (Specs.get_specs_from_payload callee_summary) then
-    Some "empty list of specs"
-  else None
+let reason_to_skip ~callee_desc : string option =
+  match callee_desc with
+  | Some (`Summary callee_summary) ->
+      let attributes = Specs.get_attributes callee_summary in
+      if attributes.ProcAttributes.is_abstract then Some "abstract method"
+      else if not attributes.ProcAttributes.is_defined then Some "method has no implementation"
+      else if List.is_empty (Specs.get_specs_from_payload callee_summary) then
+        Some "empty list of specs"
+      else (* we are not skipping *) None
+  | Some (`ProcName callee_pname) ->
+      (* no summary, so we are skipping, determining reasons *)
+      if Typ.Procname.is_method_in_objc_protocol callee_pname then
+        Some "no implementation found for method declared in Objective-C protocol"
+      else Some "function or method not found"
+  | None ->
+      Some "function or method not found"
 
 
 (** In case of constant string dereference, return the result immediately *)
@@ -1175,7 +1184,7 @@ let rec sym_exec exe_env tenv current_pdesc instr_ (prop_: Prop.normal Prop.t) p
               let ret_annots = load_ret_annots callee_pname in
               exec_skip_call ~reason:"unknown method" resolved_pname ret_annots ret_typ
           | Some resolved_summary ->
-            match reason_to_skip resolved_summary with
+            match reason_to_skip ~callee_desc:(Some (`Summary resolved_summary)) with
             | None ->
                 proc_call exe_env resolved_summary
                   (call_args prop_ callee_pname norm_args ret_id_typ loc)
@@ -1201,7 +1210,7 @@ let rec sym_exec exe_env tenv current_pdesc instr_ (prop_: Prop.normal Prop.t) p
                 let ret_annots = load_ret_annots callee_pname in
                 exec_skip_call ~reason:"unknown method" ret_annots ret_typ
             | Some callee_summary ->
-              match reason_to_skip callee_summary with
+              match reason_to_skip ~callee_desc:(Some (`Summary callee_summary)) with
               | None ->
                   let handled_args = call_args norm_prop pname url_handled_args ret_id_typ loc in
                   proc_call exe_env callee_summary handled_args
@@ -1249,11 +1258,14 @@ let rec sym_exec exe_env tenv current_pdesc instr_ (prop_: Prop.normal Prop.t) p
                 else [(prop_r, path)]
               in
               let do_call (prop, path) =
-                let reason_to_skip_opt =
-                  Option.value_map ~f:reason_to_skip ~default:(Some "function or method not found")
-                    resolved_summary_opt
+                let callee_desc =
+                  match resolved_summary_opt with
+                  | Some summary ->
+                      Some (`Summary summary)
+                  | None ->
+                      Some (`ProcName resolved_pname)
                 in
-                match reason_to_skip_opt with
+                match reason_to_skip ~callee_desc with
                 | Some reason
                   -> (
                     let ret_annots =

infer/src/clang/CType_decl.ml

@@ -284,9 +284,10 @@ and get_record_typename ?tenv decl =
       Typ.Name.Cpp.from_qual_name Typ.NoTemplate
         (CAst_utils.get_qualified_name ~linters_mode name_info)
   | ObjCInterfaceDecl (_, name_info, _, _, _), _
-  | ObjCImplementationDecl (_, name_info, _, _, _), _
-  | ObjCProtocolDecl (_, name_info, _, _, _), _ ->
+  | ObjCImplementationDecl (_, name_info, _, _, _), _ ->
       CAst_utils.get_qualified_name name_info |> Typ.Name.Objc.from_qual_name
+  | ObjCProtocolDecl (_, name_info, _, _, _), _ ->
+      CAst_utils.get_qualified_name name_info |> Typ.Name.Objc.protocol_from_qual_name
   | ObjCCategoryDecl (_, _, _, _, {odi_class_interface= Some {dr_name}}), _
   | ObjCCategoryImplDecl (_, _, _, _, {ocidi_class_interface= Some {dr_name}}), _ -> (
     match dr_name with

infer/tests/codetoanalyze/objc/errors/issues.exp

@@ -87,7 +87,7 @@ codetoanalyze/objc/errors/npe/skip_method_with_nil_object.m, SkipMethodNilA_test
 codetoanalyze/objc/errors/property/main.c, property_main, 3, MEMORY_LEAK, ERROR, [start of procedure property_main(),Skipping aProperty: function or method not found]
 codetoanalyze/objc/errors/resource_leaks/Dispatch_sources.m, ProcessContentsOfFile, 35, RESOURCE_LEAK, ERROR, [start of procedure ProcessContentsOfFile(),Taking false branch,Skipping dispatch_get_global_queue(): function or method not found,Skipping dispatch_source_create(): function or method not found,Taking false branch]
 codetoanalyze/objc/errors/resource_leaks/Dispatch_sources.m, objc_blockProcessContentsOfFile_2, 6, MEMORY_LEAK, ERROR, [start of procedure block,Skipping dispatch_source_get_data(): function or method not found,Taking true branch,Skipping MyProcessFileData(): function or method not found]
-codetoanalyze/objc/errors/resource_leaks/ResourceLeakExample.m, NSFileHandle_fileHandleForLoggingAtPath:mode:, 9, RESOURCE_LEAK, ERROR, [start of procedure fileHandleForLoggingAtPath:mode:,Taking true branch,Skipping fileSystemRepresentation: function or method not found,Taking false branch,Taking true branch,Skipping autorelease: function or method not found]
+codetoanalyze/objc/errors/resource_leaks/ResourceLeakExample.m, NSFileHandle_fileHandleForLoggingAtPath:mode:, 9, RESOURCE_LEAK, ERROR, [start of procedure fileHandleForLoggingAtPath:mode:,Taking true branch,Skipping fileSystemRepresentation: function or method not found,Taking false branch,Taking true branch,Skipping autorelease: no implementation found for method declared in Objective-C protocol]
 codetoanalyze/objc/shared/annotations/nonnull_annotations.m, A_test1:, 2, PARAMETER_NOT_NULL_CHECKED, WARNING, [start of procedure test1:,Message child with receiver nil returns nil.]
 codetoanalyze/objc/shared/annotations/nonnull_annotations.m, A_test3:, 1, PARAMETER_NOT_NULL_CHECKED, WARNING, [start of procedure test3:]
 codetoanalyze/objc/shared/annotations/nullable_annotations.m, User_otherUserName, 2, NULL_DEREFERENCE, ERROR, [start of procedure otherUserName,Skipping otherUser: function or method not found]