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[Ada] Fix incorrect handling of Ghost aspect

Message ID 20220713100253.GA994627@adacore.com
State New
Headers show
Series [Ada] Fix incorrect handling of Ghost aspect | expand

Commit Message

Pierre-Marie de Rodat July 13, 2022, 10:02 a.m. UTC 
When a formal generic type is marked as Ghost, the instantiation of that
generic will contain a generic subtype for the actual with the Ghost
pragma. Recognize this case.

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

gcc/ada/

	* sem_prag.adb (Analyze_Pragma): Recognize a generated subtype
	with Ghost pragma for generic instantiations.
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Patch

diff --git a/gcc/ada/sem_prag.adb b/gcc/ada/sem_prag.adb
--- a/gcc/ada/sem_prag.adb
+++ b/gcc/ada/sem_prag.adb
@@ -16999,6 +16999,16 @@  package body Sem_Prag is
                   then
                      Id := Defining_Entity (Stmt);
                      exit;
+
+                  --  When pragma Ghost applies to a generic formal type, the
+                  --  type declaration in the instantiation is a generated
+                  --  subtype declaration.
+
+                  elsif Nkind (Stmt) = N_Subtype_Declaration
+                    and then Present (Generic_Parent_Type (Stmt))
+                  then
+                     Id := Defining_Entity (Stmt);
+                     exit;
                   end if;
 
                --  The pragma applies to a legal construct, stop the traversal