* [Ada] Accept explicit SPARK_Mode Auto as configuration pragma
@ 2022-09-12 8:19 Marc Poulhiès
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From: Marc Poulhiès @ 2022-09-12 8:19 UTC (permalink / raw)
To: gcc-patches; +Cc: Yannick Moy
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An explicit value of Auto is now accepted for a configuration pragma
SPARK_Mode, as a way to exempt a unit from complete adherence to
SPARK rules when using a global configuration pragma file where
SPARK_Mode=>On is specified.
Tested on x86_64-pc-linux-gnu, committed on trunk
gcc/ada/
* sem_prag.adb (Analyze_Pragma): Accept SPARK_Mode=>Auto as
configuration pragma.
(Get_SPARK_Mode): Make the value for Auto explicit.
* snames.ads-tmpl (Name_Auto): Add name.
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diff --git a/gcc/ada/sem_prag.adb b/gcc/ada/sem_prag.adb
--- a/gcc/ada/sem_prag.adb
+++ b/gcc/ada/sem_prag.adb
@@ -23176,7 +23176,7 @@ package body Sem_Prag is
-- SPARK_Mode --
----------------
- -- pragma SPARK_Mode [(On | Off)];
+ -- pragma SPARK_Mode [(Auto | On | Off)];
when Pragma_SPARK_Mode => Do_SPARK_Mode : declare
Mode_Id : SPARK_Mode_Type;
@@ -23662,7 +23662,7 @@ package body Sem_Prag is
-- Check the legality of the mode (no argument = ON)
if Arg_Count = 1 then
- Check_Arg_Is_One_Of (Arg1, Name_On, Name_Off);
+ Check_Arg_Is_One_Of (Arg1, Name_Auto, Name_On, Name_Off);
Mode := Chars (Get_Pragma_Arg (Arg1));
else
Mode := Name_On;
@@ -23713,6 +23713,15 @@ package body Sem_Prag is
-- the pragma resides to find a potential construct.
else
+ -- An explicit mode of Auto is only allowed as a configuration
+ -- pragma. Escape "pragma" to avoid replacement with "aspect".
+
+ if Mode_Id = None then
+ Error_Pragma_Arg
+ ("only configuration 'p'r'a'g'm'a% can have value &",
+ Arg1);
+ end if;
+
Stmt := Prev (N);
while Present (Stmt) loop
@@ -31169,7 +31178,9 @@ package body Sem_Prag is
function Get_SPARK_Mode_Type (N : Name_Id) return SPARK_Mode_Type is
begin
- if N = Name_On then
+ if N = Name_Auto then
+ return None;
+ elsif N = Name_On then
return On;
elsif N = Name_Off then
return Off;
diff --git a/gcc/ada/snames.ads-tmpl b/gcc/ada/snames.ads-tmpl
--- a/gcc/ada/snames.ads-tmpl
+++ b/gcc/ada/snames.ads-tmpl
@@ -782,6 +782,7 @@ package Snames is
Name_Assertion : constant Name_Id := N + $;
Name_Assertions : constant Name_Id := N + $;
Name_Attribute_Name : constant Name_Id := N + $;
+ Name_Auto : constant Name_Id := N + $;
Name_Body_File_Name : constant Name_Id := N + $;
Name_Boolean_Entry_Barriers : constant Name_Id := N + $;
Name_By_Any : constant Name_Id := N + $;
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