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* [gcc r12-2017] [Ada] Adapt SPARK checking after change in rules regarding heap modeling
@ 2021-07-05 13:14 Pierre-Marie de Rodat
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From: Pierre-Marie de Rodat @ 2021-07-05 13:14 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:f7b2ce2f53b18c9770a5caae42e58791d41ae522
commit r12-2017-gf7b2ce2f53b18c9770a5caae42e58791d41ae522
Author: Yannick Moy <moy@adacore.com>
Date: Wed Apr 7 12:15:04 2021 +0200
[Ada] Adapt SPARK checking after change in rules regarding heap modeling
gcc/ada/
* libgnat/a-uncdea.ads: Add Depends/Post to
Ada.Unchecked_Deallocation.
* sem_ch4.adb (Analyze_Allocator): Remove checking of allocator
placement.
* sem_res.adb (Flag_Object): Same.
Diff:
---
gcc/ada/libgnat/a-uncdea.ads | 5 ++++-
gcc/ada/sem_ch4.adb | 10 ----------
gcc/ada/sem_res.adb | 12 ------------
3 files changed, 4 insertions(+), 23 deletions(-)
diff --git a/gcc/ada/libgnat/a-uncdea.ads b/gcc/ada/libgnat/a-uncdea.ads
index a61cd5003f9..439fa616ccb 100644
--- a/gcc/ada/libgnat/a-uncdea.ads
+++ b/gcc/ada/libgnat/a-uncdea.ads
@@ -17,7 +17,10 @@ generic
type Object (<>) is limited private;
type Name is access Object;
-procedure Ada.Unchecked_Deallocation (X : in out Name);
+procedure Ada.Unchecked_Deallocation (X : in out Name) with
+ Depends => (X => null, -- X on exit does not depend on its input value
+ null => X), -- X's input value has no effect
+ Post => X = null; -- X's output value is null
pragma Preelaborate (Unchecked_Deallocation);
pragma Import (Intrinsic, Ada.Unchecked_Deallocation);
diff --git a/gcc/ada/sem_ch4.adb b/gcc/ada/sem_ch4.adb
index ede257b6d40..d8498343157 100644
--- a/gcc/ada/sem_ch4.adb
+++ b/gcc/ada/sem_ch4.adb
@@ -889,16 +889,6 @@ package body Sem_Ch4 is
Check_Restriction (No_Local_Allocators, N);
end if;
- if SPARK_Mode = On
- and then Comes_From_Source (N)
- and then not Is_OK_Volatile_Context (Context => Parent (N),
- Obj_Ref => N,
- Check_Actuals => False)
- then
- Error_Msg_N
- ("allocator cannot appear in this context (SPARK RM 7.1.3(10))", N);
- end if;
-
if Serious_Errors_Detected > Sav_Errs then
Set_Error_Posted (N);
Set_Etype (N, Any_Type);
diff --git a/gcc/ada/sem_res.adb b/gcc/ada/sem_res.adb
index e639fab92e4..b6a9b1d653c 100644
--- a/gcc/ada/sem_res.adb
+++ b/gcc/ada/sem_res.adb
@@ -3753,18 +3753,6 @@ package body Sem_Res is
begin
case Nkind (N) is
- when N_Allocator =>
- if not Is_OK_Volatile_Context (Context => Parent (N),
- Obj_Ref => N,
- Check_Actuals => True)
- then
- Error_Msg_N
- ("allocator cannot appear in this context"
- & " (SPARK RM 7.1.3(10))", N);
- end if;
-
- return Skip;
-
-- Do not consider nested function calls because they have
-- already been processed during their own resolution.
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