distinguish between the user added annotation @Expensive and the inferred annotation @CallsExpensive

Summary: public
We should be able to distinguish if a method is annotated with Expensive and has been automatically annotated as calling an expensive method using internally the annotation CallsExpensive in the later case.

Reviewed By: cristianoc

Differential Revision: D2640478

fb-gh-sync-id: 32a7ee9

infer/src/checkers/annotations.ml

@@ -110,10 +110,11 @@ let strict = "com.facebook.infer.annotation.Strict"
 let true_on_null = "TrueOnNull"
 let verify_annotation = "com.facebook.infer.annotation.Verify"
 let expensive = "Expensive"
+let calls_expensive = "CallsExpensive"
 let performance_critical = "PerformanceCritical"
 
-let expensive_annotation = {
+let calls_expensive_annotation = {
-  Sil.class_name = expensive;
+  Sil.class_name = calls_expensive;
   Sil.parameters = []
 }
 
@@ -157,6 +158,9 @@ let ia_is_verify ia =
 let ia_is_expensive ia =
   ia_ends_with ia expensive
 
+let ia_calls_expensive ia =
+  ia_is_expensive ia || ia_ends_with ia calls_expensive
+
 let ia_is_performance_critical ia =
   ia_ends_with ia performance_critical
 

infer/src/checkers/annotations.mli

@@ -14,7 +14,7 @@ val suppressLint : string
 val expensive : string
 val performance_critical : string
 
-val expensive_annotation : Sil.annotation
+val calls_expensive_annotation : Sil.annotation
 
 type annotation =
   | Nullable
@@ -71,6 +71,7 @@ val ia_is_present : Sil.item_annotation -> bool
 val ia_is_true_on_null : Sil.item_annotation -> bool
 val ia_is_verify : Sil.item_annotation -> bool
 val ia_is_expensive : Sil.item_annotation -> bool
+val ia_calls_expensive : Sil.item_annotation -> bool
 val ia_is_performance_critical : Sil.item_annotation -> bool
 
 val ia_iter : (Sil.annotation -> unit) -> Sil.item_annotation -> unit

infer/src/checkers/performanceCritical.ml

@@ -32,7 +32,7 @@ let search_expensive_call checked_pnames expensive_callee (pname, _) =
           | Some attributes ->
               let annotated_signature = Annotations.get_annotated_signature attributes in
               let ret_annotation, _ = annotated_signature.Annotations.ret in
-              if Annotations.ia_is_expensive ret_annotation then
+              if Annotations.ia_calls_expensive ret_annotation then
                 Some pname
               else
                 None
@@ -121,7 +121,7 @@ let callback_performance_checker _ _ _ tenv pname pdesc =
   | Some _ when not expensive ->
       let ret_annot, param_annot = attributes.ProcAttributes.method_annotation in
       let updated_method_annot =
-        (Annotations.expensive_annotation, true) :: ret_annot, param_annot in
+        (Annotations.calls_expensive_annotation, true) :: ret_annot, param_annot in
       let updated_attributes =
         { attributes with ProcAttributes.method_annotation = updated_method_annot } in
       AttributesTable.store_attributes updated_attributes