diff options
Diffstat (limited to 'gcc/ada/sem_ch7.adb')
| -rw-r--r-- | gcc/ada/sem_ch7.adb | 57 |
1 files changed, 53 insertions, 4 deletions
diff --git a/gcc/ada/sem_ch7.adb b/gcc/ada/sem_ch7.adb index 11be7c1df51..91d3067ba95 100644 --- a/gcc/ada/sem_ch7.adb +++ b/gcc/ada/sem_ch7.adb @@ -692,10 +692,15 @@ package body Sem_Ch7 is -- is a public child of Parent as defined in 10.1.1 procedure Inspect_Deferred_Constant_Completion; - -- Examines the deferred constants in the private part of the - -- package specification. Emits the error "constant declaration - -- requires initialization expression " if not completed by an - -- import pragma. + -- Examines the deferred constants in the private part of the package + -- specification. Emits the error message "constant declaration requires + -- initialization expression " if not completed by an Import pragma. + + procedure Inspect_Unchecked_Union_Completion (Decls : List_Id); + -- Detects all incomplete or private type declarations having a known + -- discriminant part that are completed by an Unchecked_Union. Emits + -- the error message "Unchecked_Union may not complete discriminated + -- partial view". --------------------- -- Clear_Constants -- @@ -834,6 +839,37 @@ package body Sem_Ch7 is end loop; end Inspect_Deferred_Constant_Completion; + ---------------------------------------- + -- Inspect_Unchecked_Union_Completion -- + ---------------------------------------- + + procedure Inspect_Unchecked_Union_Completion (Decls : List_Id) is + Decl : Node_Id := First (Decls); + + begin + while Present (Decl) loop + + -- We are looking at an incomplete or private type declaration + -- with a known_discriminant_part whose full view is an + -- Unchecked_Union. + + if (Nkind (Decl) = N_Incomplete_Type_Declaration + or else + Nkind (Decl) = N_Private_Type_Declaration) + and then Has_Discriminants (Defining_Identifier (Decl)) + and then Present (Full_View (Defining_Identifier (Decl))) + and then Is_Unchecked_Union + (Full_View (Defining_Identifier (Decl))) + then + Error_Msg_N ("completion of discriminated partial view" & + " cannot be an Unchecked_Union", + Full_View (Defining_Identifier (Decl))); + end if; + + Next (Decl); + end loop; + end Inspect_Unchecked_Union_Completion; + -- Start of processing for Analyze_Package_Specification begin @@ -982,6 +1018,18 @@ package body Sem_Ch7 is Next_Entity (E); end loop; + -- Ada 2005 (AI-216): The completion of an incomplete or private type + -- declaration having a known_discriminant_part shall not be an + -- Unchecked_Union type. + + if Present (Vis_Decls) then + Inspect_Unchecked_Union_Completion (Vis_Decls); + end if; + + if Present (Priv_Decls) then + Inspect_Unchecked_Union_Completion (Priv_Decls); + end if; + if Ekind (Id) = E_Generic_Package and then Nkind (Orig_Decl) = N_Generic_Package_Declaration and then Present (Priv_Decls) @@ -1443,6 +1491,7 @@ package body Sem_Ch7 is while Present (Id) loop Install_Package_Entity (Id); + Set_Is_Hidden (Id, False); Next_Entity (Id); end loop; |