* [COMMITTED] ada: Fix internal error on call with parameter of predicated subtype
@ 2023-12-19 14:31 Marc Poulhiès
0 siblings, 0 replies; only message in thread
From: Marc Poulhiès @ 2023-12-19 14:31 UTC (permalink / raw)
To: gcc-patches; +Cc: Eric Botcazou
From: Eric Botcazou <ebotcazou@adacore.com>
The problem is that the predicated subtype does not inherit all the required
attributes of a string subtype with a static predicate.
gcc/ada/
* sem_ch3.adb (Analyze_Subtype_Declaration): Remove a short-circuit
for subtypes without aspects when it comes to predicates.
* sem_util.adb (Inherit_Predicate_Flags): Deal with private subtypes
whose full view is an Itype.
Tested on x86_64-pc-linux-gnu, committed on master.
---
gcc/ada/sem_ch3.adb | 11 ++---------
gcc/ada/sem_util.adb | 7 ++++++-
2 files changed, 8 insertions(+), 10 deletions(-)
diff --git a/gcc/ada/sem_ch3.adb b/gcc/ada/sem_ch3.adb
index 33d8f116bc2..a6bc8c95cd2 100644
--- a/gcc/ada/sem_ch3.adb
+++ b/gcc/ada/sem_ch3.adb
@@ -6032,17 +6032,10 @@ package body Sem_Ch3 is
-- If this is a subtype declaration for an actual in an instance,
-- inherit static and dynamic predicates if any.
- -- If declaration has no aspect specifications, inherit predicate
- -- info as well. Unclear how to handle the case of both specified
- -- and inherited predicates ??? Other inherited aspects, such as
- -- invariants, should be OK, but the combination with later pragmas
- -- may also require special merging.
-
if Has_Predicates (T)
and then Present (Predicate_Function (T))
- and then
- ((In_Instance and then not Comes_From_Source (N))
- or else No (Aspect_Specifications (N)))
+ and then In_Instance
+ and then not Comes_From_Source (N)
then
-- Inherit Subprograms_For_Type from the full view, if present
diff --git a/gcc/ada/sem_util.adb b/gcc/ada/sem_util.adb
index 791fa7bc12e..9cff9e1be16 100644
--- a/gcc/ada/sem_util.adb
+++ b/gcc/ada/sem_util.adb
@@ -14531,11 +14531,16 @@ package body Sem_Util is
-- A named subtype does not inherit the predicate function of its
-- parent but an itype declared for a loop index needs the discrete
-- predicate information of its parent to execute the loop properly.
+ -- Moreover, a named private subtype whose full view is an itype also
+ -- needs to inherit a predicate function because it will not be frozen.
-- A non-discrete type may has a static predicate (for example True)
-- but has no static_discrete_predicate.
if not Only_Flags
- and then Is_Itype (Subt)
+ and then (Is_Itype (Subt)
+ or else (Ekind (Subt) = E_Private_Subtype
+ and then Present (Full_View (Subt))
+ and then Is_Itype (Full_View (Subt))))
and then Present (Predicate_Function (Par))
then
Set_Subprograms_For_Type (Subt, Subprograms_For_Type (Par));
--
2.43.0
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