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[Ada] Spurious non-callable warning on prefixed call in class condition

Message ID 20220706133129.GA2205455@adacore.com
State New
Headers show
Series [Ada] Spurious non-callable warning on prefixed call in class condition | expand

Commit Message

Pierre-Marie de Rodat July 6, 2022, 1:31 p.m. UTC 
This patch corrects an error in the compiler whereby a function call in
prefix notation within a class condition causes a spurious error
claiming the name in the call is a non-callable entity when there exists
a type extension in the same unit extended with a component featuring
the same name as the function in question.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* sem_ch4.adb (Analyze_Selected_Component): Add condition to
	avoid interpreting derived type components as candidates for
	selected components in preanalysis of inherited class
	conditions.
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Patch

diff --git a/gcc/ada/sem_ch4.adb b/gcc/ada/sem_ch4.adb
--- a/gcc/ada/sem_ch4.adb
+++ b/gcc/ada/sem_ch4.adb
@@ -5158,11 +5158,26 @@  package body Sem_Ch4 is
 
       elsif Is_Record_Type (Prefix_Type) then
 
-         --  Find component with given name. In an instance, if the node is
-         --  known as a prefixed call, do not examine components whose
-         --  visibility may be accidental.
+         --  Find a component with the given name. If the node is a prefixed
+         --  call, do not examine components whose visibility may be
+         --  accidental.
 
-         while Present (Comp) and then not Is_Prefixed_Call (N) loop
+         while Present (Comp)
+           and then not Is_Prefixed_Call (N)
+
+           --  When the selector has been resolved to a function then we may be
+           --  looking at a prefixed call which has been preanalyzed already as
+           --  part of a class condition. In such cases it is possible for a
+           --  derived type to declare a component which has the same name as
+           --  a primitive used in a parent's class condition.
+
+           --  Avoid seeing components as possible interpretations of the
+           --  selected component when this is true.
+
+           and then not (Inside_Class_Condition_Preanalysis
+                          and then Present (Entity (Sel))
+                          and then Ekind (Entity (Sel)) = E_Function)
+         loop
             if Chars (Comp) = Chars (Sel)
               and then Is_Visible_Component (Comp, N)
             then