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* [gcc r14-1332] ada: Allow attributes like First and Last to be read in Exceptional_Cases
@ 2023-05-29 8:29 Marc Poulhi?s
0 siblings, 0 replies; only message in thread
From: Marc Poulhi?s @ 2023-05-29 8:29 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:f8bf6ae4cf087a9947c431a06f77104fa20ae36f
commit r14-1332-gf8bf6ae4cf087a9947c431a06f77104fa20ae36f
Author: Piotr Trojanek <trojanek@adacore.com>
Date: Tue Apr 4 09:49:26 2023 +0200
ada: Allow attributes like First and Last to be read in Exceptional_Cases
Attributes that do not read data from the object can be safely used in
consequences of Exceptional_Cases regardless of the parameter passing
mode.
gcc/ada/
* sem_res.adb (Resolve_Entity_Name): Relax rules for Exceptional_Cases.
Diff:
---
gcc/ada/sem_res.adb | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/gcc/ada/sem_res.adb b/gcc/ada/sem_res.adb
index a31077a5f33..6d4bef8d38e 100644
--- a/gcc/ada/sem_res.adb
+++ b/gcc/ada/sem_res.adb
@@ -8117,11 +8117,19 @@ package body Sem_Res is
-- Parameters of modes OUT or IN OUT of the subprogram shall not
-- occur in the consequences of an exceptional contract unless
-- they are either passed by reference or occur in the prefix
- -- of a reference to the 'Old attribute.
+ -- of a reference to the 'Old attribute. For convenience, we also
+ -- allow them as prefixes of attributes that do not actually read
+ -- data from the object.
if Ekind (E) in E_Out_Parameter | E_In_Out_Parameter
and then Within_Exceptional_Cases_Consequence (N)
and then not In_Attribute_Old (N)
+ and then not (Nkind (Parent (N)) = N_Attribute_Reference
+ and then
+ Attribute_Name (Parent (N)) in Name_Constrained
+ | Name_First
+ | Name_Last
+ | Name_Length)
and then not Is_By_Reference_Type (Etype (E))
and then not Is_Aliased (E)
then
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2023-05-29 8:29 [gcc r14-1332] ada: Allow attributes like First and Last to be read in Exceptional_Cases Marc Poulhi?s
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