+2013-10-13 Ed Schonberg <schonberg@adacore.com>
+
+ * sem_ch3.adb: in Ada 2012 access_to_function types can have
+ in-out parameters.
+ (Derived_Type_Declaration): SPARK restriction
+ must be flagged on the original node, since it may have been
+ written as a subtype declaration.
+ (Analyze_Subtype_Declaration): Do not enter name of
+ entity in declaration if it is the current entity, because it may
+ have been inserted in a previous analysis and it appears in the
+ else_part of an if-statement that is rewritten during expansion.
+
+2013-10-13 Yannick Moy <moy@adacore.com>
+
+ * exp_spark.adb (Expand_SPARK_N_Attribute_Reference): Remove procedure.
+ (Expand_SPARK): Remove call to Expand_SPARK_N_Attribute_Reference and
+ Expand_SPARK_N_Simple_Return_Statement.
+ (Expand_SPARK_N_Simple_Return_Statement,
+ Expand_SPARK_Simple_Function_Return): Remove procedures.
+
2013-10-13 Vincent Celier <celier@adacore.com>
* gnat_ugn.texi: Minor editing.
with Atree; use Atree;
with Einfo; use Einfo;
-with Exp_Attr; use Exp_Attr;
with Exp_Ch4; use Exp_Ch4;
with Exp_Ch6; use Exp_Ch6;
with Exp_Dbug; use Exp_Dbug;
with Exp_Util; use Exp_Util;
-with Rtsfind; use Rtsfind;
with Sem_Aux; use Sem_Aux;
with Sem_Res; use Sem_Res;
with Sem_Util; use Sem_Util;
with Sinfo; use Sinfo;
-with Snames; use Snames;
with Stand; use Stand;
-with Tbuild; use Tbuild;
package body Exp_SPARK is
-- * expansion of actuals to introduce necessary temporaries
-- * replacement of renaming by subprogram renamed
- procedure Expand_SPARK_N_Attribute_Reference (N : Node_Id);
- -- Expand attributes 'Old and 'Result only
-
procedure Expand_SPARK_N_Object_Renaming_Declaration (N : Node_Id);
-- Perform name evaluation for a renamed object
- procedure Expand_SPARK_N_Simple_Return_Statement (N : Node_Id);
- -- Insert conversion on function return if necessary
-
- procedure Expand_SPARK_Simple_Function_Return (N : Node_Id);
- -- Expand simple return from function
-
procedure Expand_Potential_Renaming (N : Node_Id);
-- N denotes a N_Identifier or N_Expanded_Name. If N references a renaming,
-- replace N with the renamed object.
procedure Expand_SPARK (N : Node_Id) is
begin
case Nkind (N) is
- when N_Attribute_Reference =>
- Expand_SPARK_N_Attribute_Reference (N);
-- Qualification of entity names in formal verification mode
-- is limited to the addition of a suffix for homonyms (see
when N_Object_Renaming_Declaration =>
Expand_SPARK_N_Object_Renaming_Declaration (N);
- when N_Simple_Return_Statement =>
- Expand_SPARK_N_Simple_Return_Statement (N);
-
-- In SPARK mode, no other constructs require expansion
when others =>
end if;
end Expand_SPARK_Call;
- ----------------------------------------
- -- Expand_SPARK_N_Attribute_Reference --
- ----------------------------------------
-
- procedure Expand_SPARK_N_Attribute_Reference (N : Node_Id) is
- Id : constant Attribute_Id := Get_Attribute_Id (Attribute_Name (N));
-
- begin
- case Id is
- when Attribute_Old |
- Attribute_Result =>
- Expand_N_Attribute_Reference (N);
-
- when others =>
- null;
- end case;
- end Expand_SPARK_N_Attribute_Reference;
-
------------------------------------------------
-- Expand_SPARK_N_Object_Renaming_Declaration --
------------------------------------------------
Evaluate_Name (Name (N));
end Expand_SPARK_N_Object_Renaming_Declaration;
- --------------------------------------------
- -- Expand_SPARK_N_Simple_Return_Statement --
- --------------------------------------------
-
- procedure Expand_SPARK_N_Simple_Return_Statement (N : Node_Id) is
- begin
- -- Defend against previous errors (i.e. the return statement calls a
- -- function that is not available in configurable runtime).
-
- if Present (Expression (N))
- and then Nkind (Expression (N)) = N_Empty
- then
- return;
- end if;
-
- -- Distinguish the function and non-function cases:
-
- case Ekind (Return_Applies_To (Return_Statement_Entity (N))) is
-
- when E_Function |
- E_Generic_Function =>
- Expand_SPARK_Simple_Function_Return (N);
-
- when E_Procedure |
- E_Generic_Procedure |
- E_Entry |
- E_Entry_Family |
- E_Return_Statement =>
- null;
-
- when others =>
- raise Program_Error;
- end case;
-
- exception
- when RE_Not_Available =>
- return;
- end Expand_SPARK_N_Simple_Return_Statement;
-
- -----------------------------------------
- -- Expand_SPARK_Simple_Function_Return --
- -----------------------------------------
-
- procedure Expand_SPARK_Simple_Function_Return (N : Node_Id) is
- Scope_Id : constant Entity_Id :=
- Return_Applies_To (Return_Statement_Entity (N));
- -- The function we are returning from
-
- R_Type : constant Entity_Id := Etype (Scope_Id);
- -- The result type of the function
-
- Exp : constant Node_Id := Expression (N);
- pragma Assert (Present (Exp));
-
- Exptyp : constant Entity_Id := Etype (Exp);
- -- The type of the expression (not necessarily the same as R_Type)
-
- begin
- -- Check the result expression of a scalar function against the subtype
- -- of the function by inserting a conversion. This conversion must
- -- eventually be performed for other classes of types, but for now it's
- -- only done for scalars.
- -- ???
-
- if Is_Scalar_Type (Exptyp) then
- Rewrite (Exp, Convert_To (R_Type, Exp));
-
- -- The expression is resolved to ensure that the conversion gets
- -- expanded to generate a possible constraint check.
-
- Analyze_And_Resolve (Exp, R_Type);
- end if;
- end Expand_SPARK_Simple_Function_Return;
-
-------------------------------
-- Expand_Potential_Renaming --
-------------------------------
-- be updated when the full type declaration is seen. This only applies
-- to incomplete types declared in some enclosing scope, not to limited
-- views from other packages.
+ -- Prior to Ada 2012, access to functions can only have in_parameters.
if Present (Formals) then
Formal := First_Formal (Desig_Type);
while Present (Formal) loop
if Ekind (Formal) /= E_In_Parameter
and then Nkind (T_Def) = N_Access_Function_Definition
+ and then Ada_Version < Ada_2012
then
Error_Msg_N ("functions can only have IN parameters", Formal);
end if;
-- type with constraints. In this case the entity has been introduced
-- in the private declaration.
+ -- Finally this happens in some complex cases when validity checks are
+ -- enabled, where the same subtype declaration may be analyzed twice.
+ -- This can happen if the subtype is created by the pre-analysis of
+ -- an attribute tht gives the range of a loop statement, and the loop
+ -- itself appears within an if_statement that will be rewritten during
+ -- expansion.
+
if Skip
or else (Present (Etype (Id))
and then (Is_Private_Type (Etype (Id))
then
null;
+ elsif Current_Entity (Id) = Id then
+ null;
+
else
Enter_Name (Id);
end if;
-- extensions of tagged record types.
if No (Extension) then
- Check_SPARK_Restriction ("derived type is not allowed", N);
+ Check_SPARK_Restriction
+ ("derived type is not allowed", Original_Node (N));
end if;
end Derived_Type_Declaration;
projects / platform / upstream / linaro-gcc.git / commitdiff