* [COMMITTED] ada: ICE on BIP call in class-wide function return within instance
@ 2023-05-23 8:09 Marc Poulhiès
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From: Marc Poulhiès @ 2023-05-23 8:09 UTC (permalink / raw)
To: gcc-patches; +Cc: Gary Dismukes
From: Gary Dismukes <dismukes@adacore.com>
The compiler blows up (such as with a Storage_Error or Assert_Failure)
on a call to a limited build-in-place function occurring in the return
for a function with a limited class-wide result. Such a function
should include extra formals for a task master and activation chain
(because it's possible for a limited class-wide type to have values
with task parts), but when the enclosing function occurs within an
instantiation and the result subtype comes from a formal type, the
extra formals were missing for the enclosing function. As a result,
the attempt to retrieve the task master formal for passing along to
a BIP call in the return failed when calling Build_In_Place_Formal to
loop through the formals. When determining the need for the formals in
Create_Extra_Formals, Needs_BIP_Actual_Task_Actuals was returning False,
because Might_Have_Tasks incorrectly returned False due to the test
of Is_Limited_Record flag on the class-wide generic actual subtype's
Etype being False. Is_Limited_Record was not being properly inherited
by the class-wide type in the case of private extensions, because
Make_Class_Wide_Type was called in Analyze_Private_Extension_Declaration
before certain flags (such as Is_Limited_Record and Is_Controlled_Active)
are inherited later in Build_Derived_Record_Type (which will also call
Make_Class_Wide_Type). This is corrected by removing the early call
to Make_Class_Wide_Type.
gcc/ada/
* exp_ch6.adb (Might_Have_Tasks): Remove unneeded Etype call from
call to Is_Limited_Record, since that flag is now properly
inherited by class-wide types.
* sem_ch3.adb (Analyze_Private_Extension_Declaration): Remove call
to Make_Class_Wide_Type, which is done too early, and will later
be done in Build_Derived_Record_Type after flags such as
Is_Limited_Record and Is_Controlled_Active have been set on the
derived type.
Tested on x86_64-pc-linux-gnu, committed on master.
---
gcc/ada/exp_ch6.adb | 2 +-
gcc/ada/sem_ch3.adb | 1 -
2 files changed, 1 insertion(+), 2 deletions(-)
diff --git a/gcc/ada/exp_ch6.adb b/gcc/ada/exp_ch6.adb
index 28b746ba2c4..fce10d5e946 100644
--- a/gcc/ada/exp_ch6.adb
+++ b/gcc/ada/exp_ch6.adb
@@ -9326,7 +9326,7 @@ package body Exp_Ch6 is
and then not No_Run_Time_Mode
and then (Has_Task (Typ)
or else (Is_Class_Wide_Type (Typ)
- and then Is_Limited_Record (Etype (Typ))
+ and then Is_Limited_Record (Typ)
and then not Has_Aspect
(Etype (Typ), Aspect_No_Task_Parts)));
end Might_Have_Tasks;
diff --git a/gcc/ada/sem_ch3.adb b/gcc/ada/sem_ch3.adb
index 50ccb390363..a0783195b8b 100644
--- a/gcc/ada/sem_ch3.adb
+++ b/gcc/ada/sem_ch3.adb
@@ -5376,7 +5376,6 @@ package body Sem_Ch3 is
Set_Convention (T, Convention (Parent_Type));
Set_First_Rep_Item (T, First_Rep_Item (Parent_Type));
Set_Is_First_Subtype (T);
- Make_Class_Wide_Type (T);
-- Set the SPARK mode from the current context
--
2.40.0
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2023-05-23 8:09 [COMMITTED] ada: ICE on BIP call in class-wide function return within instance Marc Poulhiès
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