-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2016, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
with Exp_Dist; use Exp_Dist;
with Exp_Tss; use Exp_Tss;
with Exp_Util; use Exp_Util;
-with Fname; use Fname;
with Freeze; use Freeze;
with Ghost; use Ghost;
with Itypes; use Itypes;
-- present. If errors are found, error messages are posted, and the
-- Real_Range_Specification of Def is reset to Empty.
- procedure Propagate_Default_Init_Cond_Attributes
- (From_Typ : Entity_Id;
- To_Typ : Entity_Id;
- Parent_To_Derivation : Boolean := False;
- Private_To_Full_View : Boolean := False);
- -- Subsidiary to routines Build_Derived_Type and Process_Full_View. Inherit
- -- all attributes related to pragma Default_Initial_Condition from From_Typ
- -- to To_Typ. Flag Parent_To_Derivation should be set when the context is
- -- the creation of a derived type. Flag Private_To_Full_View should be set
- -- when processing both views of a private type.
-
procedure Record_Type_Declaration
(T : Entity_Id;
N : Node_Id;
if Nkind (S) /= N_Subtype_Indication then
Analyze (S);
- if Ekind (Root_Type (Entity (S))) = E_Incomplete_Type then
+ if Present (Entity (S))
+ and then Ekind (Root_Type (Entity (S))) = E_Incomplete_Type
+ then
Set_Directly_Designated_Type (T, Entity (S));
-- If the designated type is a limited view, we cannot tell if
elsif Is_Class_Wide_Type (Full_Desig) and then Etype (Full_Desig) = T
then
Error_Msg_N
- ("access type cannot designate its own classwide type", S);
+ ("access type cannot designate its own class-wide type", S);
-- Clean up indication of tagged status to prevent cascaded errors
Derived_Type => Tagged_Type,
Parent_Type => Iface);
+ declare
+ Anc : Entity_Id;
+ begin
+ if Is_Inherited_Operation (Prim)
+ and then Present (Alias (Prim))
+ then
+ Anc := Alias (Prim);
+ else
+ Anc := Overridden_Operation (Prim);
+ end if;
+
+ -- Apply legality checks in RM 6.1.1 (10-13) concerning
+ -- nonconforming preconditions in both an ancestor and
+ -- a progenitor operation.
+
+ if Present (Anc)
+ and then Has_Non_Trivial_Precondition (Anc)
+ and then Has_Non_Trivial_Precondition (Iface_Prim)
+ then
+ if Is_Abstract_Subprogram (Prim)
+ or else
+ (Ekind (Prim) = E_Procedure
+ and then Nkind (Parent (Prim)) =
+ N_Procedure_Specification
+ and then Null_Present (Parent (Prim)))
+ then
+ null;
+
+ -- The inherited operation must be overridden
+
+ elsif not Comes_From_Source (Prim) then
+ Error_Msg_NE
+ ("&inherits non-conforming preconditions and must "
+ & "be overridden (RM 6.1.1 (10-16)",
+ Parent (Tagged_Type), Prim);
+ end if;
+ end if;
+ end;
+
-- Ada 2005 (AI-251): Decorate internal entity Iface_Subp
-- associated with interface types. These entities are
-- only registered in the list of primitives of its
when others =>
return False;
-
end case;
end Contains_POC;
-- (They have the sloc of the label as found in the source, and that
-- is ahead of the current declarative part).
+ procedure Build_Assertion_Bodies (Decls : List_Id; Context : Node_Id);
+ -- Create the subprogram bodies which verify the run-time semantics of
+ -- the pragmas listed below for each elibigle type found in declarative
+ -- list Decls. The pragmas are:
+ --
+ -- Default_Initial_Condition
+ -- Invariant
+ -- Type_Invariant
+ --
+ -- Context denotes the owner of the declarative list.
+
+ procedure Check_Entry_Contracts;
+ -- Perform a pre-analysis of the pre- and postconditions of an entry
+ -- declaration. This must be done before full resolution and creation
+ -- of the parameter block, etc. to catch illegal uses within the
+ -- contract expression. Full analysis of the expression is done when
+ -- the contract is processed.
+
procedure Handle_Late_Controlled_Primitive (Body_Decl : Node_Id);
-- Determine whether Body_Decl denotes the body of a late controlled
-- primitive (either Initialize, Adjust or Finalize). If this is the
-- case, add a proper spec if the body lacks one. The spec is inserted
-- before Body_Decl and immediately analyzed.
+ procedure Remove_Partial_Visible_Refinements (Spec_Id : Entity_Id);
+ -- Spec_Id is the entity of a package that may define abstract states,
+ -- and in the case of a child unit, whose ancestors may define abstract
+ -- states. If the states have partial visible refinement, remove the
+ -- partial visibility of each constituent at the end of the package
+ -- spec and body declarations.
+
procedure Remove_Visible_Refinements (Spec_Id : Entity_Id);
-- Spec_Id is the entity of a package that may define abstract states.
-- If the states have visible refinement, remove the visibility of each
- -- constituent at the end of the package body declarations.
+ -- constituent at the end of the package body declaration.
+
+ procedure Resolve_Aspects;
+ -- Utility to resolve the expressions of aspects at the end of a list of
+ -- declarations.
+
+ function Uses_Unseen_Lib_Unit_Priv (Pkg : Entity_Id) return Boolean;
+ -- Check if an inner package has entities within it that rely on library
+ -- level private types where the full view has not been seen.
-----------------
-- Adjust_Decl --
end loop;
end Adjust_Decl;
+ ----------------------------
+ -- Build_Assertion_Bodies --
+ ----------------------------
+
+ procedure Build_Assertion_Bodies (Decls : List_Id; Context : Node_Id) is
+ procedure Build_Assertion_Bodies_For_Type (Typ : Entity_Id);
+ -- Create the subprogram bodies which verify the run-time semantics
+ -- of the pragmas listed below for type Typ. The pragmas are:
+ --
+ -- Default_Initial_Condition
+ -- Invariant
+ -- Type_Invariant
+
+ -------------------------------------
+ -- Build_Assertion_Bodies_For_Type --
+ -------------------------------------
+
+ procedure Build_Assertion_Bodies_For_Type (Typ : Entity_Id) is
+ begin
+ -- Preanalyze and resolve the Default_Initial_Condition assertion
+ -- expression at the end of the declarations to catch any errors.
+
+ if Has_DIC (Typ) then
+ Build_DIC_Procedure_Body (Typ);
+ end if;
+
+ if Nkind (Context) = N_Package_Specification then
+
+ -- Preanalyze and resolve the class-wide invariants of an
+ -- interface at the end of whichever declarative part has the
+ -- interface type. Note that an interface may be declared in
+ -- any non-package declarative part, but reaching the end of
+ -- such a declarative part will always freeze the type and
+ -- generate the invariant procedure (see Freeze_Type).
+
+ if Is_Interface (Typ) then
+
+ -- Interfaces are treated as the partial view of a private
+ -- type, in order to achieve uniformity with the general
+ -- case. As a result, an interface receives only a "partial"
+ -- invariant procedure, which is never called.
+
+ if Has_Own_Invariants (Typ) then
+ Build_Invariant_Procedure_Body
+ (Typ => Typ,
+ Partial_Invariant => True);
+ end if;
+
+ -- Preanalyze and resolve the invariants of a private type
+ -- at the end of the visible declarations to catch potential
+ -- errors. Inherited class-wide invariants are not included
+ -- because they have already been resolved.
+
+ elsif Decls = Visible_Declarations (Context)
+ and then Ekind_In (Typ, E_Limited_Private_Type,
+ E_Private_Type,
+ E_Record_Type_With_Private)
+ and then Has_Own_Invariants (Typ)
+ then
+ Build_Invariant_Procedure_Body
+ (Typ => Typ,
+ Partial_Invariant => True);
+
+ -- Preanalyze and resolve the invariants of a private type's
+ -- full view at the end of the private declarations to catch
+ -- potential errors.
+
+ elsif Decls = Private_Declarations (Context)
+ and then not Is_Private_Type (Typ)
+ and then Has_Private_Declaration (Typ)
+ and then Has_Invariants (Typ)
+ then
+ Build_Invariant_Procedure_Body (Typ);
+ end if;
+ end if;
+ end Build_Assertion_Bodies_For_Type;
+
+ -- Local variables
+
+ Decl : Node_Id;
+ Decl_Id : Entity_Id;
+
+ -- Start of processing for Build_Assertion_Bodies
+
+ begin
+ Decl := First (Decls);
+ while Present (Decl) loop
+ if Is_Declaration (Decl) then
+ Decl_Id := Defining_Entity (Decl);
+
+ if Is_Type (Decl_Id) then
+ Build_Assertion_Bodies_For_Type (Decl_Id);
+ end if;
+ end if;
+
+ Next (Decl);
+ end loop;
+ end Build_Assertion_Bodies;
+
+ ---------------------------
+ -- Check_Entry_Contracts --
+ ---------------------------
+
+ procedure Check_Entry_Contracts is
+ ASN : Node_Id;
+ Ent : Entity_Id;
+ Exp : Node_Id;
+
+ begin
+ Ent := First_Entity (Current_Scope);
+ while Present (Ent) loop
+
+ -- This only concerns entries with pre/postconditions
+
+ if Ekind (Ent) = E_Entry
+ and then Present (Contract (Ent))
+ and then Present (Pre_Post_Conditions (Contract (Ent)))
+ then
+ ASN := Pre_Post_Conditions (Contract (Ent));
+ Push_Scope (Ent);
+ Install_Formals (Ent);
+
+ -- Pre/postconditions are rewritten as Check pragmas. Analysis
+ -- is performed on a copy of the pragma expression, to prevent
+ -- modifying the original expression.
+
+ while Present (ASN) loop
+ if Nkind (ASN) = N_Pragma then
+ Exp :=
+ New_Copy_Tree
+ (Expression
+ (First (Pragma_Argument_Associations (ASN))));
+ Set_Parent (Exp, ASN);
+
+ Preanalyze_Assert_Expression (Exp, Standard_Boolean);
+ end if;
+
+ ASN := Next_Pragma (ASN);
+ end loop;
+
+ End_Scope;
+ end if;
+
+ Next_Entity (Ent);
+ end loop;
+ end Check_Entry_Contracts;
+
--------------------------------------
-- Handle_Late_Controlled_Primitive --
--------------------------------------
Insert_Before_And_Analyze (Body_Decl, Decl);
end Handle_Late_Controlled_Primitive;
+ ----------------------------------------
+ -- Remove_Partial_Visible_Refinements --
+ ----------------------------------------
+
+ procedure Remove_Partial_Visible_Refinements (Spec_Id : Entity_Id) is
+ State_Elmt : Elmt_Id;
+ begin
+ if Present (Abstract_States (Spec_Id)) then
+ State_Elmt := First_Elmt (Abstract_States (Spec_Id));
+ while Present (State_Elmt) loop
+ Set_Has_Partial_Visible_Refinement (Node (State_Elmt), False);
+ Next_Elmt (State_Elmt);
+ end loop;
+ end if;
+
+ -- For a child unit, also hide the partial state refinement from
+ -- ancestor packages.
+
+ if Is_Child_Unit (Spec_Id) then
+ Remove_Partial_Visible_Refinements (Scope (Spec_Id));
+ end if;
+ end Remove_Partial_Visible_Refinements;
+
--------------------------------
-- Remove_Visible_Refinements --
--------------------------------
end if;
end Remove_Visible_Refinements;
+ ---------------------
+ -- Resolve_Aspects --
+ ---------------------
+
+ procedure Resolve_Aspects is
+ E : Entity_Id;
+
+ begin
+ E := First_Entity (Current_Scope);
+ while Present (E) loop
+ Resolve_Aspect_Expressions (E);
+ Next_Entity (E);
+ end loop;
+ end Resolve_Aspects;
+
+ -------------------------------
+ -- Uses_Unseen_Lib_Unit_Priv --
+ -------------------------------
+
+ function Uses_Unseen_Lib_Unit_Priv (Pkg : Entity_Id) return Boolean is
+ Curr : Entity_Id;
+
+ begin
+ -- Avoid looking through scopes that do not meet the precondition of
+ -- Pkg not being within a library unit spec.
+
+ if not Is_Compilation_Unit (Pkg)
+ and then not Is_Generic_Instance (Pkg)
+ and then not In_Package_Body (Enclosing_Lib_Unit_Entity (Pkg))
+ then
+ -- Loop through all entities in the current scope to identify
+ -- an entity that depends on a private type.
+
+ Curr := First_Entity (Pkg);
+ loop
+ if Nkind (Curr) in N_Entity
+ and then Depends_On_Private (Curr)
+ then
+ return True;
+ end if;
+
+ exit when Last_Entity (Current_Scope) = Curr;
+ Curr := Next_Entity (Curr);
+ end loop;
+ end if;
+
+ return False;
+ end Uses_Unseen_Lib_Unit_Priv;
+
-- Local variables
Context : Node_Id := Empty;
-- (This is needed in any case for early instantiations ???).
if No (Next_Decl) then
- if Nkind_In (Parent (L), N_Component_List,
- N_Task_Definition,
- N_Protected_Definition)
- then
+ if Nkind (Parent (L)) = N_Component_List then
null;
+ elsif Nkind_In (Parent (L), N_Protected_Definition,
+ N_Task_Definition)
+ then
+ Check_Entry_Contracts;
+
elsif Nkind (Parent (L)) /= N_Package_Specification then
if Nkind (Parent (L)) = N_Package_Body then
Freeze_From := First_Entity (Current_Scope);
Freeze_All (First_Entity (Current_Scope), Decl);
Freeze_From := Last_Entity (Current_Scope);
+ -- Current scope is a package specification
+
elsif Scope (Current_Scope) /= Standard_Standard
and then not Is_Child_Unit (Current_Scope)
and then No (Generic_Parent (Parent (L)))
then
- null;
+ -- This is needed in all cases to catch visibility errors in
+ -- aspect expressions, but several large user tests are now
+ -- rejected. Pending notification we restrict this call to
+ -- ASIS mode.
+
+ if ASIS_Mode then
+ Resolve_Aspects;
+ end if;
elsif L /= Visible_Declarations (Parent (L))
- or else No (Private_Declarations (Parent (L)))
- or else Is_Empty_List (Private_Declarations (Parent (L)))
+ or else No (Private_Declarations (Parent (L)))
+ or else Is_Empty_List (Private_Declarations (Parent (L)))
then
Adjust_Decl;
+
+ -- End of a package declaration
+
+ -- In compilation mode the expansion of freeze node takes care
+ -- of resolving expressions of all aspects in the list. In ASIS
+ -- mode this must be done explicitly.
+
+ if ASIS_Mode
+ and then Scope (Current_Scope) = Standard_Standard
+ then
+ Resolve_Aspects;
+ end if;
+
+ -- This is a freeze point because it is the end of a
+ -- compilation unit.
+
Freeze_All (First_Entity (Current_Scope), Decl);
Freeze_From := Last_Entity (Current_Scope);
-- pragmas do not appear in the original generic tree.
elsif Serious_Errors_Detected = 0 then
- declare
- E : Entity_Id;
-
- begin
- E := First_Entity (Current_Scope);
- while Present (E) loop
- Resolve_Aspect_Expressions (E);
- Next_Entity (E);
- end loop;
- end;
+ Resolve_Aspects;
end if;
-- If next node is a body then freeze all types before the body.
-- care to attach the bodies at a proper place in the tree so as to
-- not cause unwanted freezing at that point.
- elsif not Analyzed (Next_Decl) and then Is_Body (Next_Decl) then
+ -- It is also necessary to check for a case where both an expression
+ -- function is used and the current scope depends on an unseen
+ -- private type from a library unit, otherwise premature freezing of
+ -- the private type will occur.
+ elsif not Analyzed (Next_Decl) and then Is_Body (Next_Decl)
+ and then ((Nkind (Next_Decl) /= N_Subprogram_Body
+ or else not Was_Expression_Function (Next_Decl))
+ or else not Uses_Unseen_Lib_Unit_Priv (Current_Scope))
+ then
-- When a controlled type is frozen, the expander generates stream
- -- and controlled type support routines. If the freeze is caused
- -- by the stand alone body of Initialize, Adjust and Finalize, the
- -- expander will end up using the wrong version of these routines
+ -- and controlled-type support routines. If the freeze is caused
+ -- by the stand-alone body of Initialize, Adjust, or Finalize, the
+ -- expander will end up using the wrong version of these routines,
-- as the body has not been processed yet. To remedy this, detect
-- a late controlled primitive and create a proper spec for it.
-- This ensures that the primitive will override its inherited
-- The spec of the late primitive is not generated in ASIS mode to
-- ensure a consistent list of primitives that indicates the true
-- semantic structure of the program (which is not relevant when
- -- generating executable code.
+ -- generating executable code).
- -- ??? a cleaner approach may be possible and/or this solution
+ -- ??? A cleaner approach may be possible and/or this solution
-- could be extended to general-purpose late primitives, TBD.
- if not ASIS_Mode and then not Body_Seen and then not Is_Body (Decl)
+ if not ASIS_Mode
+ and then not Body_Seen
+ and then not Is_Body (Decl)
then
Body_Seen := True;
end if;
Adjust_Decl;
+
+ -- The generated body of an expression function does not freeze,
+ -- unless it is a completion, in which case only the expression
+ -- itself freezes. This is handled when the body itself is
+ -- analyzed (see Freeze_Expr_Types, sem_ch6.adb).
+
Freeze_All (Freeze_From, Decl);
Freeze_From := Last_Entity (Current_Scope);
end if;
Decl := Next_Decl;
end loop;
- -- Analyze the contracts of packages and their bodies
+ -- Post-freezing actions
if Present (L) then
Context := Parent (L);
+ -- Analyze the contracts of packages and their bodies
+
if Nkind (Context) = N_Package_Specification then
-- When a package has private declarations, its contract must be
if L = Private_Declarations (Context) then
Analyze_Package_Contract (Defining_Entity (Context));
- -- Build the bodies of the default initial condition procedures
- -- for all types subject to pragma Default_Initial_Condition.
- -- From a purely Ada stand point, this is a freezing activity,
- -- however freezing is not available under GNATprove_Mode. To
- -- accomodate both scenarios, the bodies are build at the end
- -- of private declaration analysis.
-
- Build_Default_Init_Cond_Procedure_Bodies (L);
-
-- Otherwise the contract is analyzed at the end of the visible
-- declarations.
-- restore the original state conditions.
Remove_Visible_Refinements (Corresponding_Spec (Context));
+ Remove_Partial_Visible_Refinements (Corresponding_Spec (Context));
+
+ elsif Nkind (Context) = N_Package_Declaration then
+
+ -- Partial state refinements are visible up to the end of the
+ -- package spec declarations. Hide the partial state refinements
+ -- from visibility to restore the original state conditions.
+
+ Remove_Partial_Visible_Refinements (Corresponding_Spec (Context));
end if;
-- Verify that all abstract states found in any package declared in
-- protected, subprogram, or task body (SPARK RM 7.2.2(3)).
Check_State_Refinements (Context);
+
+ -- Create the subprogram bodies which verify the run-time semantics
+ -- of pragmas Default_Initial_Condition and [Type_]Invariant for all
+ -- types within the current declarative list. This ensures that all
+ -- assertion expressions are preanalyzed and resolved at the end of
+ -- the declarative part. Note that the resolution happens even when
+ -- freezing does not take place.
+
+ Build_Assertion_Bodies (L, Context);
end if;
end Analyze_Declarations;
----------------------------------
procedure Check_Nonoverridable_Aspects is
- Prev_Aspects : constant List_Id :=
- Aspect_Specifications (Parent (Def_Id));
- Par_Type : Entity_Id;
-
- function Has_Aspect_Spec
- (Specs : List_Id;
- Aspect_Name : Name_Id) return Boolean;
+ function Get_Aspect_Spec
+ (Specs : List_Id;
+ Aspect_Name : Name_Id) return Node_Id;
-- Check whether a list of aspect specifications includes an entry
-- for a specific aspect. The list is either that of a partial or
-- a full view.
---------------------
- -- Has_Aspect_Spec --
+ -- Get_Aspect_Spec --
---------------------
- function Has_Aspect_Spec
- (Specs : List_Id;
- Aspect_Name : Name_Id) return Boolean
+ function Get_Aspect_Spec
+ (Specs : List_Id;
+ Aspect_Name : Name_Id) return Node_Id
is
Spec : Node_Id;
+
begin
Spec := First (Specs);
while Present (Spec) loop
if Chars (Identifier (Spec)) = Aspect_Name then
- return True;
+ return Spec;
end if;
Next (Spec);
end loop;
- return False;
- end Has_Aspect_Spec;
+
+ return Empty;
+ end Get_Aspect_Spec;
+
+ -- Local variables
+
+ Prev_Aspects : constant List_Id :=
+ Aspect_Specifications (Parent (Def_Id));
+ Par_Type : Entity_Id;
+ Prev_Aspect : Node_Id;
-- Start of processing for Check_Nonoverridable_Aspects
begin
-
- -- Get parent type of derived type. Note that Prev is the entity
- -- in the partial declaration, but its contents are now those of
- -- full view, while Def_Id reflects the partial view.
+ -- Get parent type of derived type. Note that Prev is the entity in
+ -- the partial declaration, but its contents are now those of full
+ -- view, while Def_Id reflects the partial view.
if Is_Private_Type (Def_Id) then
Par_Type := Etype (Full_View (Def_Id));
and then Present (Discriminant_Specifications (Parent (Prev)))
and then Present (Get_Reference_Discriminant (Par_Type))
then
- if
- not Has_Aspect_Spec (Prev_Aspects, Name_Implicit_Dereference)
+ Prev_Aspect :=
+ Get_Aspect_Spec (Prev_Aspects, Name_Implicit_Dereference);
+
+ if No (Prev_Aspect)
+ and then Present
+ (Discriminant_Specifications
+ (Original_Node (Parent (Prev))))
then
Error_Msg_N
("type does not inherit implicit dereference", Prev);
-- is consistent with that of the parent.
declare
- Par_Discr : constant Entity_Id :=
+ Par_Discr : constant Entity_Id :=
Get_Reference_Discriminant (Par_Type);
- Cur_Discr : constant Entity_Id :=
+ Cur_Discr : constant Entity_Id :=
Get_Reference_Discriminant (Prev);
+
begin
if Corresponding_Discriminant (Cur_Discr) /= Par_Discr then
Error_Msg_N ("aspect incosistent with that of parent", N);
end if;
+
+ -- Check that specification in partial view matches the
+ -- inherited aspect. Compare names directly because aspect
+ -- expression may not be analyzed.
+
+ if Present (Prev_Aspect)
+ and then Nkind (Expression (Prev_Aspect)) = N_Identifier
+ and then Chars (Expression (Prev_Aspect)) /=
+ Chars (Cur_Discr)
+ then
+ Error_Msg_N
+ ("aspect incosistent with that of parent", N);
+ end if;
end;
end if;
end if;
when N_Derived_Type_Definition =>
Derived_Type_Declaration (T, N, T /= Def_Id);
+ -- Inherit predicates from parent, and protect against illegal
+ -- derivations.
+
+ if Is_Type (T) and then Has_Predicates (T) then
+ Set_Has_Predicates (Def_Id);
+ end if;
+
when N_Enumeration_Type_Definition =>
Enumeration_Type_Declaration (T, Def);
when others =>
raise Program_Error;
-
end case;
end if;
Check_SPARK_05_Restriction ("controlled type is not allowed", N);
end if;
- -- A type declared within a Ghost region is automatically Ghost
- -- (SPARK RM 6.9(2)).
-
- if Ghost_Mode > None then
- Set_Is_Ghost_Entity (T);
- end if;
-
-- Some common processing for all types
Set_Depends_On_Private (T, Has_Private_Component (T));
if Chars (Scope (Def_Id)) = Name_System
and then Chars (Def_Id) = Name_Address
- and then Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (N)))
+ and then In_Predefined_Unit (N)
then
Set_Is_Descendant_Of_Address (Def_Id);
Set_Is_Descendant_Of_Address (Base_Type (Def_Id));
Set_Is_First_Subtype (T, True);
Set_Etype (T, T);
- -- An incomplete type declared within a Ghost region is automatically
- -- Ghost (SPARK RM 6.9(2)).
-
- if Ghost_Mode > None then
- Set_Is_Ghost_Entity (T);
- end if;
-
-- Ada 2005 (AI-326): Minimum decoration to give support to tagged
-- incomplete types.
Generate_Definition (Id);
Enter_Name (Id);
- -- A number declared within a Ghost region is automatically Ghost
- -- (SPARK RM 6.9(2)).
-
- if Ghost_Mode > None then
- Set_Is_Ghost_Entity (Id);
- end if;
-
-- This is an optimization of a common case of an integer literal
if Nkind (E) = N_Integer_Literal then
-- Analyze_Object_Declaration --
--------------------------------
+ -- WARNING: This routine manages Ghost regions. Return statements must be
+ -- replaced by gotos which jump to the end of the routine and restore the
+ -- Ghost mode.
+
procedure Analyze_Object_Declaration (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Id : constant Entity_Id := Defining_Identifier (N);
T : Entity_Id;
E : Node_Id := Expression (N);
- -- E is set to Expression (N) throughout this routine. When
- -- Expression (N) is modified, E is changed accordingly.
+ -- E is set to Expression (N) throughout this routine. When Expression
+ -- (N) is modified, E is changed accordingly.
Prev_Entity : Entity_Id := Empty;
+ procedure Check_Dynamic_Object (Typ : Entity_Id);
+ -- A library-level object with non-static discriminant constraints may
+ -- require dynamic allocation. The declaration is illegal if the
+ -- profile includes the restriction No_Implicit_Heap_Allocations.
+
+ procedure Check_For_Null_Excluding_Components
+ (Obj_Typ : Entity_Id;
+ Obj_Decl : Node_Id);
+ -- Verify that each null-excluding component of object declaration
+ -- Obj_Decl carrying type Obj_Typ has explicit initialization. Emit
+ -- a compile-time warning if this is not the case.
+
function Count_Tasks (T : Entity_Id) return Uint;
-- This function is called when a non-generic library level object of a
-- task type is declared. Its function is to count the static number of
-- Any other relevant delayed aspects on object declarations ???
+ --------------------------
+ -- Check_Dynamic_Object --
+ --------------------------
+
+ procedure Check_Dynamic_Object (Typ : Entity_Id) is
+ Comp : Entity_Id;
+ Obj_Type : Entity_Id;
+
+ begin
+ Obj_Type := Typ;
+
+ if Is_Private_Type (Obj_Type)
+ and then Present (Full_View (Obj_Type))
+ then
+ Obj_Type := Full_View (Obj_Type);
+ end if;
+
+ if Known_Static_Esize (Obj_Type) then
+ return;
+ end if;
+
+ if Restriction_Active (No_Implicit_Heap_Allocations)
+ and then Expander_Active
+ and then Has_Discriminants (Obj_Type)
+ then
+ Comp := First_Component (Obj_Type);
+ while Present (Comp) loop
+ if Known_Static_Esize (Etype (Comp))
+ or else Size_Known_At_Compile_Time (Etype (Comp))
+ then
+ null;
+
+ elsif not Discriminated_Size (Comp)
+ and then Comes_From_Source (Comp)
+ then
+ Error_Msg_NE
+ ("component& of non-static size will violate restriction "
+ & "No_Implicit_Heap_Allocation?", N, Comp);
+
+ elsif Is_Record_Type (Etype (Comp)) then
+ Check_Dynamic_Object (Etype (Comp));
+ end if;
+
+ Next_Component (Comp);
+ end loop;
+ end if;
+ end Check_Dynamic_Object;
+
+ -----------------------------------------
+ -- Check_For_Null_Excluding_Components --
+ -----------------------------------------
+
+ procedure Check_For_Null_Excluding_Components
+ (Obj_Typ : Entity_Id;
+ Obj_Decl : Node_Id)
+ is
+ procedure Check_Component
+ (Comp_Typ : Entity_Id;
+ Comp_Decl : Node_Id := Empty;
+ Array_Comp : Boolean := False);
+ -- Apply a compile-time null-exclusion check on a component denoted
+ -- by its declaration Comp_Decl and type Comp_Typ, and all of its
+ -- subcomponents (if any).
+
+ ---------------------
+ -- Check_Component --
+ ---------------------
+
+ procedure Check_Component
+ (Comp_Typ : Entity_Id;
+ Comp_Decl : Node_Id := Empty;
+ Array_Comp : Boolean := False)
+ is
+ Comp : Entity_Id;
+ T : Entity_Id;
+
+ begin
+ -- Do not consider internally-generated components or those that
+ -- are already initialized.
+
+ if Present (Comp_Decl)
+ and then (not Comes_From_Source (Comp_Decl)
+ or else Present (Expression (Comp_Decl)))
+ then
+ return;
+ end if;
+
+ if Is_Incomplete_Or_Private_Type (Comp_Typ)
+ and then Present (Full_View (Comp_Typ))
+ then
+ T := Full_View (Comp_Typ);
+ else
+ T := Comp_Typ;
+ end if;
+
+ -- Verify a component of a null-excluding access type
+
+ if Is_Access_Type (T)
+ and then Can_Never_Be_Null (T)
+ then
+ if Comp_Decl = Obj_Decl then
+ Null_Exclusion_Static_Checks
+ (N => Obj_Decl,
+ Comp => Empty,
+ Array_Comp => Array_Comp);
+
+ else
+ Null_Exclusion_Static_Checks
+ (N => Obj_Decl,
+ Comp => Comp_Decl,
+ Array_Comp => Array_Comp);
+ end if;
+
+ -- Check array components
+
+ elsif Is_Array_Type (T) then
+
+ -- There is no suitable component when the object is of an
+ -- array type. However, a namable component may appear at some
+ -- point during the recursive inspection, but not at the top
+ -- level. At the top level just indicate array component case.
+
+ if Comp_Decl = Obj_Decl then
+ Check_Component (Component_Type (T), Array_Comp => True);
+ else
+ Check_Component (Component_Type (T), Comp_Decl);
+ end if;
+
+ -- Verify all components of type T
+
+ -- Note: No checks are performed on types with discriminants due
+ -- to complexities involving variants. ???
+
+ elsif (Is_Concurrent_Type (T)
+ or else Is_Incomplete_Or_Private_Type (T)
+ or else Is_Record_Type (T))
+ and then not Has_Discriminants (T)
+ then
+ Comp := First_Component (T);
+ while Present (Comp) loop
+ Check_Component (Etype (Comp), Parent (Comp));
+
+ Comp := Next_Component (Comp);
+ end loop;
+ end if;
+ end Check_Component;
+
+ -- Start processing for Check_For_Null_Excluding_Components
+
+ begin
+ Check_Component (Obj_Typ, Obj_Decl);
+ end Check_For_Null_Excluding_Components;
+
-----------------
-- Count_Tasks --
-----------------
-- Local variables
- Save_Ghost_Mode : constant Ghost_Mode_Type := Ghost_Mode;
- Related_Id : Entity_Id;
+ Saved_GM : constant Ghost_Mode_Type := Ghost_Mode;
+ -- Save the Ghost mode to restore on exit
+
+ Related_Id : Entity_Id;
-- Start of processing for Analyze_Object_Declaration
N_Package_Renaming_Declaration
and then not Comes_From_Source (Prev_Entity)
and then
- Is_Generic_Instance (Renamed_Entity (Prev_Entity))))
+ Is_Generic_Instance (Renamed_Entity (Prev_Entity)))
+
+ -- The entity may be a homonym of a private component of the
+ -- enclosing protected object, for which we create a local
+ -- renaming declaration. The declaration is legal, even if
+ -- useless when it just captures that component.
+
+ or else
+ (Ekind (Scope (Current_Scope)) = E_Protected_Type
+ and then Nkind (Parent (Prev_Entity)) =
+ N_Object_Renaming_Declaration))
then
Prev_Entity := Empty;
end if;
end if;
- -- The object declaration is Ghost when it is subject to pragma Ghost or
- -- completes a deferred Ghost constant. Set the mode now to ensure that
- -- any nodes generated during analysis and expansion are properly marked
- -- as Ghost.
+ if Present (Prev_Entity) then
+
+ -- The object declaration is Ghost when it completes a deferred Ghost
+ -- constant.
- Set_Ghost_Mode (N, Prev_Entity);
+ Mark_And_Set_Ghost_Completion (N, Prev_Entity);
- if Present (Prev_Entity) then
Constant_Redeclaration (Id, N, T);
Generate_Reference (Prev_Entity, Id, 'c');
-- Ada 2005 (AI-231): Propagate the null-excluding attribute and carry
-- out some static checks.
- if Ada_Version >= Ada_2005 and then Can_Never_Be_Null (T) then
+ if Ada_Version >= Ada_2005 then
-- In case of aggregates we must also take care of the correct
-- initialization of nested aggregates bug this is done at the
- -- point of the analysis of the aggregate (see sem_aggr.adb).
+ -- point of the analysis of the aggregate (see sem_aggr.adb) ???
- if Present (Expression (N))
- and then Nkind (Expression (N)) = N_Aggregate
- then
- null;
+ if Can_Never_Be_Null (T) then
+ if Present (Expression (N))
+ and then Nkind (Expression (N)) = N_Aggregate
+ then
+ null;
+
+ else
+ declare
+ Save_Typ : constant Entity_Id := Etype (Id);
+ begin
+ Set_Etype (Id, T); -- Temp. decoration for static checks
+ Null_Exclusion_Static_Checks (N);
+ Set_Etype (Id, Save_Typ);
+ end;
+ end if;
+
+ -- We might be dealing with an object of a composite type containing
+ -- null-excluding components without an aggregate, so we must verify
+ -- that such components have default initialization.
else
- declare
- Save_Typ : constant Entity_Id := Etype (Id);
- begin
- Set_Etype (Id, T); -- Temp. decoration for static checks
- Null_Exclusion_Static_Checks (N);
- Set_Etype (Id, Save_Typ);
- end;
+ Check_For_Null_Excluding_Components (T, N);
end if;
end if;
Object_Definition (N));
end if;
+ if Is_Library_Level_Entity (Id) then
+ Check_Dynamic_Object (T);
+ end if;
+
-- There are no aliased objects in SPARK
if Aliased_Present (N) then
and then Analyzed (N)
and then No (Expression (N))
then
- Ghost_Mode := Save_Ghost_Mode;
- return;
+ goto Leave;
end if;
-- If E is null and has been replaced by an N_Raise_Constraint_Error
if No (E) and then Is_Null_Record_Type (T) then
null;
+ -- Do not generate a predicate check if the initialization expression
+ -- is a type conversion because the conversion has been subjected to
+ -- the same check. This is a small optimization which avoid redundant
+ -- checks.
+
+ elsif Present (E) and then Nkind (E) = N_Type_Conversion then
+ null;
+
else
Insert_After (N,
Make_Predicate_Check (T, New_Occurrence_Of (Id, Loc)));
Set_Ekind (Id, E_Variable);
end if;
- -- An object declared within a Ghost region is automatically
- -- Ghost (SPARK RM 6.9(2)).
-
- if Ghost_Mode > None then
- Set_Is_Ghost_Entity (Id);
-
- -- The Ghost policy in effect at the point of declaration
- -- and at the point of completion must match
- -- (SPARK RM 6.9(14)).
-
- if Present (Prev_Entity)
- and then Is_Ghost_Entity (Prev_Entity)
- then
- Check_Ghost_Completion (Prev_Entity, Id);
- end if;
- end if;
-
Rewrite (N,
Make_Object_Renaming_Declaration (Loc,
Defining_Identifier => Id,
Set_Renamed_Object (Id, E);
Freeze_Before (N, T);
Set_Is_Frozen (Id);
-
- Ghost_Mode := Save_Ghost_Mode;
- return;
+ goto Leave;
else
-- Ensure that the generated subtype has a unique external name
elsif Is_Array_Type (T)
and then No_Initialization (N)
- and then Nkind (Original_Node (E)) = N_Aggregate
+ and then (Nkind (Original_Node (E)) = N_Aggregate
+ or else (Nkind (Original_Node (E)) = N_Qualified_Expression
+ and then Nkind (Original_Node (Expression
+ (Original_Node (E)))) = N_Aggregate))
then
if not Is_Entity_Name (Object_Definition (N)) then
Act_T := Etype (E);
elsif Nkind (E) = N_Aggregate
and then Present (Component_Associations (E))
- and then Present (Choices (First (Component_Associations (E))))
- and then Nkind (First
- (Choices (First (Component_Associations (E))))) = N_Others_Choice
+ and then Present (Choice_List (First (Component_Associations (E))))
+ and then
+ Nkind (First (Choice_List (First (Component_Associations (E))))) =
+ N_Others_Choice
then
null;
Init_Esize (Id);
Set_Optimize_Alignment_Flags (Id);
- -- An object declared within a Ghost region is automatically Ghost
- -- (SPARK RM 6.9(2)).
-
- if Ghost_Mode > None
- or else (Present (Prev_Entity) and then Is_Ghost_Entity (Prev_Entity))
- then
- Set_Is_Ghost_Entity (Id);
-
- -- The Ghost policy in effect at the point of declaration and at the
- -- point of completion must match (SPARK RM 6.9(14)).
-
- if Present (Prev_Entity) and then Is_Ghost_Entity (Prev_Entity) then
- Check_Ghost_Completion (Prev_Entity, Id);
- end if;
- end if;
-
-- Deal with aliased case
if Aliased_Present (N) then
-- type, rewrite the declaration as a renaming of the result of the
-- call. The exceptions below are cases where the copy is expected,
-- either by the back end (Aliased case) or by the semantics, as for
- -- initializing controlled types or copying tags for classwide types.
+ -- initializing controlled types or copying tags for class-wide types.
if Present (E)
and then Nkind (E) = N_Explicit_Dereference
Check_No_Hidden_State (Id);
end if;
- Ghost_Mode := Save_Ghost_Mode;
+ Restore_Ghost_Mode (Saved_GM);
end Analyze_Object_Declaration;
---------------------------
procedure Analyze_Private_Extension_Declaration (N : Node_Id) is
Indic : constant Node_Id := Subtype_Indication (N);
T : constant Entity_Id := Defining_Identifier (N);
+ Iface : Entity_Id;
+ Iface_Elmt : Elmt_Id;
Parent_Base : Entity_Id;
Parent_Type : Entity_Id;
elsif Is_Concurrent_Type (Parent_Type) then
Error_Msg_N
- ("parent type of a private extension cannot be "
- & "a synchronized tagged type (RM 3.9.1 (3/1))", N);
+ ("parent type of a private extension cannot be a synchronized "
+ & "tagged type (RM 3.9.1 (3/1))", N);
Set_Etype (T, Any_Type);
Set_Ekind (T, E_Limited_Private_Type);
if (not Is_Package_Or_Generic_Package (Current_Scope)
and then Nkind (Parent (N)) /= N_Generic_Subprogram_Declaration)
or else In_Private_Part (Current_Scope)
-
then
Error_Msg_N ("invalid context for private extension", N);
end if;
Set_Ekind (T, E_Record_Type_With_Private);
Init_Size_Align (T);
Set_Default_SSO (T);
+ Set_No_Reordering (T, No_Component_Reordering);
Set_Etype (T, Parent_Base);
Propagate_Concurrent_Flags (T, Parent_Base);
Build_Derived_Record_Type (N, Parent_Type, T);
- -- Propagate inherited invariant information. The new type has
- -- invariants, if the parent type has inheritable invariants,
- -- and these invariants can in turn be inherited.
+ -- A private extension inherits the Default_Initial_Condition pragma
+ -- coming from any parent type within the derivation chain.
- if Has_Inheritable_Invariants (Parent_Type) then
- Set_Has_Inheritable_Invariants (T);
- Set_Has_Invariants (T);
+ if Has_DIC (Parent_Type) then
+ Set_Has_Inherited_DIC (T);
+ end if;
+
+ -- A private extension inherits any class-wide invariants coming from a
+ -- parent type or an interface. Note that the invariant procedure of the
+ -- parent type should not be inherited because the private extension may
+ -- define invariants of its own.
+
+ if Has_Inherited_Invariants (Parent_Type)
+ or else Has_Inheritable_Invariants (Parent_Type)
+ then
+ Set_Has_Inherited_Invariants (T);
+
+ elsif Present (Interfaces (T)) then
+ Iface_Elmt := First_Elmt (Interfaces (T));
+ while Present (Iface_Elmt) loop
+ Iface := Node (Iface_Elmt);
+
+ if Has_Inheritable_Invariants (Iface) then
+ Set_Has_Inherited_Invariants (T);
+ exit;
+ end if;
+
+ Next_Elmt (Iface_Elmt);
+ end loop;
end if;
-- Ada 2005 (AI-443): Synchronized private extension or a rewritten
(not Is_Interface (Parent_Type)
or else not Is_Synchronized_Interface (Parent_Type))
then
- Error_Msg_NE ("parent type of & must be tagged limited " &
- "or synchronized", N, T);
+ Error_Msg_NE
+ ("parent type of & must be tagged limited or synchronized",
+ N, T);
end if;
-- The progenitors (if any) must be limited or synchronized
-- interfaces.
if Present (Interfaces (T)) then
- declare
- Iface : Entity_Id;
- Iface_Elmt : Elmt_Id;
+ Iface_Elmt := First_Elmt (Interfaces (T));
+ while Present (Iface_Elmt) loop
+ Iface := Node (Iface_Elmt);
- begin
- Iface_Elmt := First_Elmt (Interfaces (T));
- while Present (Iface_Elmt) loop
- Iface := Node (Iface_Elmt);
-
- if not Is_Limited_Interface (Iface)
- and then not Is_Synchronized_Interface (Iface)
- then
- Error_Msg_NE ("progenitor & must be limited " &
- "or synchronized", N, Iface);
- end if;
+ if not Is_Limited_Interface (Iface)
+ and then not Is_Synchronized_Interface (Iface)
+ then
+ Error_Msg_NE
+ ("progenitor & must be limited or synchronized",
+ N, Iface);
+ end if;
- Next_Elmt (Iface_Elmt);
- end loop;
- end;
+ Next_Elmt (Iface_Elmt);
+ end loop;
end if;
-- Regular derived extension, the parent must be a limited or
end if;
end if;
+ -- Remember that its parent type has a private extension. Used to warn
+ -- on public primitives of the parent type defined after its private
+ -- extensions (see Check_Dispatching_Operation).
+
+ Set_Has_Private_Extension (Parent_Type);
+
<<Leave>>
if Has_Aspects (N) then
Analyze_Aspect_Specifications (N, T);
then
Set_Has_Predicates (Id);
Set_Has_Delayed_Freeze (Id);
+
+ -- Generated subtypes inherit the predicate function from the parent
+ -- (no aspects to examine on the generated declaration).
+
+ if not Comes_From_Source (N) then
+ Set_Ekind (Id, Ekind (T));
+
+ if Present (Predicate_Function (T)) then
+ Set_Predicate_Function (Id, Predicate_Function (T));
+
+ elsif Present (Ancestor_Subtype (T))
+ and then Has_Predicates (Ancestor_Subtype (T))
+ and then Present (Predicate_Function (Ancestor_Subtype (T)))
+ then
+ Set_Predicate_Function (Id,
+ Predicate_Function (Ancestor_Subtype (T)));
+ end if;
+ end if;
end if;
-- Subtype of Boolean cannot have a constraint in SPARK
case Ekind (T) is
when Array_Kind =>
- Set_Ekind (Id, E_Array_Subtype);
- Copy_Array_Subtype_Attributes (Id, T);
+ Set_Ekind (Id, E_Array_Subtype);
+ Copy_Array_Subtype_Attributes (Id, T);
when Decimal_Fixed_Point_Kind =>
Set_Ekind (Id, E_Decimal_Fixed_Point_Subtype);
Set_Equivalent_Type (Id, Equivalent_Type (T));
end if;
- when E_Record_Type | E_Record_Subtype =>
+ when E_Record_Subtype
+ | E_Record_Type
+ =>
Set_Ekind (Id, E_Record_Subtype);
if Ekind (T) = E_Record_Subtype
Set_Stored_Constraint_From_Discriminant_Constraint (Id);
end if;
- when Incomplete_Kind =>
+ when Incomplete_Kind =>
if Ada_Version >= Ada_2005 then
-- In Ada 2005 an incomplete type can be explicitly tagged:
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))
+ or else No (Aspect_Specifications (N)))
then
Set_Subprograms_For_Type (Id, Subprograms_For_Type (T));
Conditional_Delay (Id, T);
end if;
+ -- If we have a subtype of an incomplete type whose full type is a
+ -- derived numeric type, we need to have a freeze node for the subtype.
+ -- Otherwise gigi will complain while computing the (static) bounds of
+ -- the subtype.
+
+ if Is_Itype (T)
+ and then Is_Elementary_Type (Id)
+ and then Etype (Id) /= Id
+ then
+ declare
+ Partial : constant Entity_Id :=
+ Incomplete_Or_Partial_View (First_Subtype (Id));
+ begin
+ if Present (Partial)
+ and then Ekind (Partial) = E_Incomplete_Type
+ then
+ Set_Has_Delayed_Freeze (Id);
+ end if;
+ end;
+ end if;
+
-- Check that Constraint_Error is raised for a scalar subtype indication
-- when the lower or upper bound of a non-null range lies outside the
-- range of the type mark.
if Nkind (Subtype_Indication (N)) = N_Subtype_Indication then
if Is_Scalar_Type (Etype (Id))
- and then Scalar_Range (Id) /=
- Scalar_Range (Etype (Subtype_Mark
- (Subtype_Indication (N))))
+ and then Scalar_Range (Id) /=
+ Scalar_Range
+ (Etype (Subtype_Mark (Subtype_Indication (N))))
then
Apply_Range_Check
(Scalar_Range (Id),
end if;
end if;
- -- A type invariant applies to any subtype in its scope, in particular
- -- to a generic actual.
-
- if Has_Invariants (T) and then In_Open_Scopes (Scope (T)) then
- Set_Has_Invariants (Id);
- Set_Invariant_Procedure (Id, Invariant_Procedure (T));
- end if;
-
Set_Optimize_Alignment_Flags (Id);
Check_Eliminated (Id);
procedure Array_Type_Declaration (T : in out Entity_Id; Def : Node_Id) is
Component_Def : constant Node_Id := Component_Definition (Def);
Component_Typ : constant Node_Id := Subtype_Indication (Component_Def);
+ P : constant Node_Id := Parent (Def);
Element_Type : Entity_Id;
Implicit_Base : Entity_Id;
Index : Node_Id;
- Related_Id : Entity_Id := Empty;
Nb_Index : Nat;
- P : constant Node_Id := Parent (Def);
Priv : Entity_Id;
+ Related_Id : Entity_Id := Empty;
begin
if Nkind (Def) = N_Constrained_Array_Definition then
then
declare
Loc : constant Source_Ptr := Sloc (Def);
- New_E : Entity_Id;
Decl : Entity_Id;
+ New_E : Entity_Id;
begin
New_E := Make_Temporary (Loc, 'T');
Analyze (Decl);
Set_Etype (Index, New_E);
- -- If the index is a range the Entity attribute is not
- -- available. Example:
+ -- If the index is a range or a subtype indication it carries
+ -- no entity. Example:
-- package Pkg is
-- type T is private;
-- Table : array (T(1) .. T(10)) of Boolean;
-- end Pkg;
- if Nkind (Index) /= N_Range then
+ -- Otherwise the type of the reference is its entity.
+
+ if Is_Entity_Name (Index) then
Set_Entity (Index, New_E);
end if;
end;
-- Complete setup of implicit base type
- Set_First_Index (Implicit_Base, First_Index (T));
- Set_Component_Type (Implicit_Base, Element_Type);
- Propagate_Concurrent_Flags (Implicit_Base, Element_Type);
- Set_Component_Size (Implicit_Base, Uint_0);
- Set_Packed_Array_Impl_Type (Implicit_Base, Empty);
- Set_Has_Controlled_Component (Implicit_Base,
- Has_Controlled_Component (Element_Type)
- or else Is_Controlled_Active (Element_Type));
- Set_Finalize_Storage_Only (Implicit_Base,
- Finalize_Storage_Only (Element_Type));
-
- -- Inherit the "ghostness" from the constrained array type
+ Set_Component_Size (Implicit_Base, Uint_0);
+ Set_Component_Type (Implicit_Base, Element_Type);
+ Set_Finalize_Storage_Only
+ (Implicit_Base,
+ Finalize_Storage_Only (Element_Type));
+ Set_First_Index (Implicit_Base, First_Index (T));
+ Set_Has_Controlled_Component
+ (Implicit_Base,
+ Has_Controlled_Component (Element_Type)
+ or else Is_Controlled_Active (Element_Type));
+ Set_Packed_Array_Impl_Type
+ (Implicit_Base, Empty);
- if Ghost_Mode > None or else Is_Ghost_Entity (T) then
- Set_Is_Ghost_Entity (Implicit_Base);
- end if;
+ Propagate_Concurrent_Flags (Implicit_Base, Element_Type);
-- Unconstrained array case
Set_Is_Internal (Anon);
case Nkind (N) is
- when N_Component_Declaration |
- N_Unconstrained_Array_Definition |
- N_Constrained_Array_Definition =>
+ when N_Constrained_Array_Definition
+ | N_Component_Declaration
+ | N_Unconstrained_Array_Definition
+ =>
Comp := Component_Definition (N);
Acc := Access_Definition (Comp);
Copy_Array_Base_Type_Attributes (Implicit_Base, Parent_Base);
Set_Has_Delayed_Freeze (Implicit_Base, True);
-
- -- Inherit the "ghostness" from the parent base type
-
- if Ghost_Mode > None or else Is_Ghost_Entity (Parent_Base) then
- Set_Is_Ghost_Entity (Implicit_Base);
- end if;
end Make_Implicit_Base;
-- Start of processing for Build_Derived_Array_Type
-- If we constructed a default range for the case where no range
-- was given, then the expressions in the range must not freeze
-- since they do not correspond to expressions in the source.
+ -- However, if the type inherits predicates the expressions will
+ -- be elaborated earlier and must freeze.
- if Nkind (Indic) /= N_Subtype_Indication then
+ if Nkind (Indic) /= N_Subtype_Indication
+ and then not Has_Predicates (Derived_Type)
+ then
Set_Must_Not_Freeze (Lo);
Set_Must_Not_Freeze (Hi);
Set_Must_Not_Freeze (Rang_Expr);
Set_Ekind (Full_Der, E_Record_Type);
Set_Is_Underlying_Record_View (Full_Der);
Set_Default_SSO (Full_Der);
+ Set_No_Reordering (Full_Der, No_Component_Reordering);
Analyze (Decl);
Set_Full_View (Derived_Type, Full_Der);
else
Set_Underlying_Full_View (Derived_Type, Full_Der);
+ Set_Is_Underlying_Full_View (Full_Der);
end if;
if not Is_Base_Type (Derived_Type) then
Set_Last_Entity (Der_Base, Last_Discr);
Set_First_Entity (Derived_Type, First_Entity (Der_Base));
Set_Last_Entity (Derived_Type, Last_Entity (Der_Base));
-
- Set_Stored_Constraint
- (Full_Der, Stored_Constraint (Derived_Type));
end;
end if;
Set_Full_View (Derived_Type, Full_Der);
else
Set_Underlying_Full_View (Derived_Type, Full_Der);
+ Set_Is_Underlying_Full_View (Full_Der);
end if;
-- In any case, the primitive operations are inherited from the
else
Build_Full_Derivation;
Set_Underlying_Full_View (Derived_Type, Full_Der);
+ Set_Is_Underlying_Full_View (Full_Der);
end if;
-- The full view will be used to swap entities on entry/exit to
-- 3. DISCRIMINANTS IN DERIVED UNTAGGED RECORD TYPES
-- We have spoken about stored discriminants in point 1 (introduction)
- -- above. There are two sort of stored discriminants: implicit and
+ -- above. There are two sorts of stored discriminants: implicit and
-- explicit. As long as the derived type inherits the same discriminants as
-- the root record type, stored discriminants are the same as regular
-- discriminants, and are said to be implicit. However, if any discriminant
-- type T4 (Y : Int) is new T3 (Y, 99);
-- The following table summarizes the discriminants and stored
- -- discriminants in R and T1 through T4.
+ -- discriminants in R and T1 through T4:
-- Type Discrim Stored Discrim Comment
-- R (D1, D2, D3) (D1, D2, D3) Girder discrims implicit in R
-- Field Corresponding_Discriminant (abbreviated CD below) allows us to
-- find the corresponding discriminant in the parent type, while
- -- Original_Record_Component (abbreviated ORC below), the actual physical
+ -- Original_Record_Component (abbreviated ORC below) the actual physical
-- component that is renamed. Finally the field Is_Completely_Hidden
-- (abbreviated ICH below) is set for all explicit stored discriminants
-- (see einfo.ads for more info). For the above example this gives:
-- D2 in T3 empty itself yes
-- D3 in T3 empty itself yes
- -- Y in T4 X1 in T3 D3 in T3 no
- -- D1 in T3 empty itself yes
- -- D2 in T3 empty itself yes
- -- D3 in T3 empty itself yes
+ -- Y in T4 X1 in T3 D3 in T4 no
+ -- D1 in T4 empty itself yes
+ -- D2 in T4 empty itself yes
+ -- D3 in T4 empty itself yes
-- 4. DISCRIMINANTS IN DERIVED TAGGED RECORD TYPES
Type_Def := N;
Set_Ekind (Derived_Type, E_Record_Type_With_Private);
Set_Default_SSO (Derived_Type);
+ Set_No_Reordering (Derived_Type, No_Component_Reordering);
else
Type_Def := Type_Definition (N);
if Present (Record_Extension_Part (Type_Def)) then
Set_Ekind (Derived_Type, E_Record_Type);
Set_Default_SSO (Derived_Type);
+ Set_No_Reordering (Derived_Type, No_Component_Reordering);
-- Create internal access types for components with anonymous
-- access types.
-- However, if the record contains an array constrained by
-- the discriminant but with some different bound, the compiler
- -- attemps to create a smaller range for the discriminant type.
+ -- tries to create a smaller range for the discriminant type.
-- (See exp_ch3.Adjust_Discriminants). In this case, where
-- the discriminant type is a scalar type, the check must use
-- the original discriminant type in the parent declaration.
Set_Has_Primitive_Operations
(Derived_Type, Has_Primitive_Operations (Parent_Base));
- -- Fields inherited from the Parent_Base in the non-private case
+ -- Set fields for private derived types
- if Ekind (Derived_Type) = E_Record_Type then
- Set_Has_Complex_Representation
- (Derived_Type, Has_Complex_Representation (Parent_Base));
+ if Is_Private_Type (Derived_Type) then
+ Set_Depends_On_Private (Derived_Type, True);
+ Set_Private_Dependents (Derived_Type, New_Elmt_List);
end if;
- -- Fields inherited from the Parent_Base for record types
+ -- Inherit fields for non-private types. If this is the completion of a
+ -- derivation from a private type, the parent itself is private and the
+ -- attributes come from its full view, which must be present.
if Is_Record_Type (Derived_Type) then
declare
Parent_Full : Entity_Id;
begin
- -- Ekind (Parent_Base) is not necessarily E_Record_Type since
- -- Parent_Base can be a private type or private extension. Go
- -- to the full view here to get the E_Record_Type specific flags.
-
- if Present (Full_View (Parent_Base)) then
+ if Is_Private_Type (Parent_Base)
+ and then not Is_Record_Type (Parent_Base)
+ then
Parent_Full := Full_View (Parent_Base);
else
Parent_Full := Parent_Base;
end if;
- Set_OK_To_Reorder_Components
- (Derived_Type, OK_To_Reorder_Components (Parent_Full));
- end;
- end if;
-
- -- Set fields for private derived types
-
- if Is_Private_Type (Derived_Type) then
- Set_Depends_On_Private (Derived_Type, True);
- Set_Private_Dependents (Derived_Type, New_Elmt_List);
-
- -- Inherit fields from non private record types. If this is the
- -- completion of a derivation from a private type, the parent itself
- -- is private, and the attributes come from its full view, which must
- -- be present.
-
- else
- if Is_Private_Type (Parent_Base)
- and then not Is_Record_Type (Parent_Base)
- then
- Set_Component_Alignment
- (Derived_Type, Component_Alignment (Full_View (Parent_Base)));
- Set_C_Pass_By_Copy
- (Derived_Type, C_Pass_By_Copy (Full_View (Parent_Base)));
- else
Set_Component_Alignment
- (Derived_Type, Component_Alignment (Parent_Base));
+ (Derived_Type, Component_Alignment (Parent_Full));
Set_C_Pass_By_Copy
- (Derived_Type, C_Pass_By_Copy (Parent_Base));
- end if;
+ (Derived_Type, C_Pass_By_Copy (Parent_Full));
+ Set_Has_Complex_Representation
+ (Derived_Type, Has_Complex_Representation (Parent_Full));
+
+ -- For untagged types, inherit the layout by default to avoid
+ -- costly changes of representation for type conversions.
+
+ if not Is_Tagged then
+ Set_Is_Packed (Derived_Type, Is_Packed (Parent_Full));
+ Set_No_Reordering (Derived_Type, No_Reordering (Parent_Full));
+ end if;
+ end;
end if;
-- Set fields for tagged types
end;
end if;
- -- Propagate inherited invariant information of parents
- -- and progenitors
-
- if Ada_Version >= Ada_2012
- and then not Is_Interface (Derived_Type)
- then
- if Has_Inheritable_Invariants (Parent_Type) then
- Set_Has_Invariants (Derived_Type);
- Set_Has_Inheritable_Invariants (Derived_Type);
-
- elsif not Is_Empty_Elmt_List (Ifaces_List) then
- declare
- AI : Elmt_Id;
-
- begin
- AI := First_Elmt (Ifaces_List);
- while Present (AI) loop
- if Has_Inheritable_Invariants (Node (AI)) then
- Set_Has_Invariants (Derived_Type);
- Set_Has_Inheritable_Invariants (Derived_Type);
-
- exit;
- end if;
-
- Next_Elmt (AI);
- end loop;
- end;
- end if;
- end if;
-
-- A type extension is automatically Ghost when one of its
-- progenitors is Ghost (SPARK RM 6.9(9)). This property is
-- also inherited when the parent type is Ghost, but this is
end if;
end;
end if;
-
- else
- Set_Is_Packed (Derived_Type, Is_Packed (Parent_Base));
- Set_Has_Non_Standard_Rep
- (Derived_Type, Has_Non_Standard_Rep (Parent_Base));
end if;
-- STEP 4: Inherit components from the parent base and constrain them.
-- STEP 5a: Copy the parent record declaration for untagged types
+ Set_Has_Implicit_Dereference
+ (Derived_Type, Has_Implicit_Dereference (Parent_Type));
+
if not Is_Tagged then
-- Discriminant_Constraint (Derived_Type) has been properly
Set_Stored_Constraint
(Derived_Type, Expand_To_Stored_Constraint (Parent_Type, Discs));
Replace_Components (Derived_Type, New_Decl);
- Set_Has_Implicit_Dereference
- (Derived_Type, Has_Implicit_Dereference (Parent_Type));
end if;
-- Insert the new derived type declaration
Set_Default_SSO (Derived_Type);
end if;
- -- Propagate invariant information. The new type has invariants if
- -- they are inherited from the parent type, and these invariants can
- -- be further inherited, so both flags are set.
+ -- A derived type inherits the Default_Initial_Condition pragma coming
+ -- from any parent type within the derivation chain.
+
+ if Has_DIC (Parent_Type) then
+ Set_Has_Inherited_DIC (Derived_Type);
+ end if;
+
+ -- A derived type inherits any class-wide invariants coming from a
+ -- parent type or an interface. Note that the invariant procedure of
+ -- the parent type should not be inherited because the derived type may
+ -- define invariants of its own.
+
+ if not Is_Interface (Derived_Type) then
+ if Has_Inherited_Invariants (Parent_Type)
+ or else Has_Inheritable_Invariants (Parent_Type)
+ then
+ Set_Has_Inherited_Invariants (Derived_Type);
+
+ elsif Is_Concurrent_Type (Derived_Type)
+ or else Is_Tagged_Type (Derived_Type)
+ then
+ declare
+ Iface : Entity_Id;
+ Ifaces : Elist_Id;
+ Iface_Elmt : Elmt_Id;
+
+ begin
+ Collect_Interfaces
+ (T => Derived_Type,
+ Ifaces_List => Ifaces,
+ Exclude_Parents => True);
+
+ if Present (Ifaces) then
+ Iface_Elmt := First_Elmt (Ifaces);
+ while Present (Iface_Elmt) loop
+ Iface := Node (Iface_Elmt);
+
+ if Has_Inheritable_Invariants (Iface) then
+ Set_Has_Inherited_Invariants (Derived_Type);
+ exit;
+ end if;
+
+ Next_Elmt (Iface_Elmt);
+ end loop;
+ end if;
+ end;
+ end if;
+ end if;
- -- We similarly inherit predicates
+ -- We similarly inherit predicates. Note that for scalar derived types
+ -- the predicate is inherited from the first subtype, and not from its
+ -- (anonymous) base type.
- if Has_Predicates (Parent_Type) then
+ if Has_Predicates (Parent_Type)
+ or else Has_Predicates (First_Subtype (Parent_Type))
+ then
Set_Has_Predicates (Derived_Type);
end if;
Inherit_Rep_Item_Chain (Derived_Type, Parent_Type);
- -- Propagate the attributes related to pragma Default_Initial_Condition
- -- from the parent type to the private extension. A derived type always
- -- inherits the default initial condition flag from the parent type. If
- -- the derived type carries its own Default_Initial_Condition pragma,
- -- the flag is later reset in Analyze_Pragma. Note that both flags are
- -- mutually exclusive.
-
- Propagate_Default_Init_Cond_Attributes
- (From_Typ => Parent_Type,
- To_Typ => Derived_Type,
- Parent_To_Derivation => True);
-
-- If the parent type has delayed rep aspects, then mark the derived
-- type as possibly inheriting a delayed rep aspect.
Set_May_Inherit_Delayed_Rep_Aspects (Derived_Type);
end if;
- -- Propagate the attributes related to pragma Ghost from the parent type
- -- to the derived type or type extension (SPARK RM 6.9(9)).
+ -- A derived type becomes Ghost when its parent type is also Ghost
+ -- (SPARK RM 6.9(9)). Note that the Ghost-related attributes are not
+ -- directly inherited because the Ghost policy in effect may differ.
if Is_Ghost_Entity (Parent_Type) then
Set_Is_Ghost_Entity (Derived_Type);
when Array_Kind =>
Build_Derived_Array_Type (N, Parent_Type, Derived_Type);
- when E_Record_Type
+ when Class_Wide_Kind
| E_Record_Subtype
- | Class_Wide_Kind =>
+ | E_Record_Type
+ =>
Build_Derived_Record_Type
(N, Parent_Type, Derived_Type, Derive_Subps);
return;
Set_Mechanism (D_Minal, Default_Mechanism);
Set_Etype (D_Minal, Etype (Discrim));
Set_Scope (D_Minal, Current_Scope);
+ Set_Parent (D_Minal, Parent (Discrim));
Set_Discriminal (Discrim, D_Minal);
Set_Discriminal_Link (D_Minal, Discrim);
-- If any of the discriminant constraints is given by a
-- discriminant and we are in a derived type declaration we
-- have a discriminant renaming. Establish link between new
- -- and old discriminant.
+ -- and old discriminant. The new discriminant has an implicit
+ -- dereference if the old one does.
if Denotes_Discriminant (Discr_Expr (J)) then
if Derived_Def then
- Set_Corresponding_Discriminant
- (Entity (Discr_Expr (J)), Discr);
+ declare
+ New_Discr : constant Entity_Id := Entity (Discr_Expr (J));
+
+ begin
+ Set_Corresponding_Discriminant (New_Discr, Discr);
+ Set_Has_Implicit_Dereference (New_Discr,
+ Has_Implicit_Dereference (Discr));
+ end;
end if;
-- Force the evaluation of non-discriminant expressions.
null;
elsif Nkind (Parent (Parent (Def))) = N_Component_Declaration
- and then
- Has_Per_Object_Constraint
- (Defining_Identifier (Parent (Parent (Def))))
+ and then Has_Per_Object_Constraint
+ (Defining_Identifier (Parent (Parent (Def))))
then
null;
if Ekind (Etype (Discr)) = E_Anonymous_Access_Type
and then not Is_Class_Wide_Type
- (Designated_Type (Etype (Discr)))
+ (Designated_Type (Etype (Discr)))
and then Etype (Discr_Expr (J)) /= Any_Type
and then Is_Class_Wide_Type
(Designated_Type (Etype (Discr_Expr (J))))
then
Error_Msg_NE
("constraint for discriminant& must be access to variable",
- Def, Discr);
+ Def, Discr);
end if;
end if;
-- elaboration, because only the access type is needed in the
-- initialization procedure.
- Set_Ekind (Def_Id, Ekind (T));
+ if Ekind (T) = E_Incomplete_Type then
+ Set_Ekind (Def_Id, E_Incomplete_Subtype);
+ else
+ Set_Ekind (Def_Id, Ekind (T));
+ end if;
if For_Access and then Within_Init_Proc then
null;
Set_Last_Entity (Def_Id, Last_Entity (T));
Set_Has_Implicit_Dereference
(Def_Id, Has_Implicit_Dereference (T));
+ Set_Has_Pragma_Unreferenced_Objects
+ (Def_Id, Has_Pragma_Unreferenced_Objects (T));
-- If the subtype is the completion of a private declaration, there may
-- have been representation clauses for the partial view, and they must
Analyze (Indic);
Set_Underlying_Full_View (Typ, Full_View (Subt));
+ Set_Is_Underlying_Full_View (Full_View (Subt));
end Build_Underlying_Full_View;
-------------------------------
Save_Homonym := Homonym (Priv);
case Ekind (Full_Base) is
- when E_Record_Type |
- E_Record_Subtype |
- Class_Wide_Kind |
- Private_Kind |
- Task_Kind |
- Protected_Kind =>
+ when Class_Wide_Kind
+ | Private_Kind
+ | Protected_Kind
+ | Task_Kind
+ | E_Record_Subtype
+ | E_Record_Type
+ =>
Copy_Node (Priv, Full);
Set_Has_Discriminants
-- already frozen. We skip this processing if the type is an anonymous
-- subtype of a record component, or is the corresponding record of a
-- protected type, since these are processed when the enclosing type
- -- is frozen.
+ -- is frozen. If the parent type is declared in a nested package then
+ -- the freezing of the private and full views also happens later.
if not Is_Type (Scope (Full)) then
- Set_Has_Delayed_Freeze (Full,
- Has_Delayed_Freeze (Full_Base)
- and then (not Is_Frozen (Full_Base)));
+ if Is_Itype (Priv)
+ and then In_Same_Source_Unit (Full, Full_Base)
+ and then Scope (Full_Base) /= Scope (Full)
+ then
+ Set_Has_Delayed_Freeze (Full);
+ Set_Has_Delayed_Freeze (Priv);
+
+ else
+ Set_Has_Delayed_Freeze (Full,
+ Has_Delayed_Freeze (Full_Base)
+ and then not Is_Frozen (Full_Base));
+ end if;
end if;
Set_Freeze_Node (Full, Empty);
Append : Boolean;
Item : Node_Id;
Next_Item : Node_Id;
+ Priv_Item : Node_Id;
begin
Item := First_Rep_Item (Full);
+ Priv_Item := First_Rep_Item (Priv);
-- If no existing rep items on full type, we can just link directly
-- to the list of items on the private type, if any exist.. Same if
if (No (Item)
or else Nkind (Item) /= N_Aspect_Specification
or else Entity (Item) = Full_Base)
- and then Present (First_Rep_Item (Priv))
+ and then Present (First_Rep_Item (Priv))
then
- Set_First_Rep_Item (Full, First_Rep_Item (Priv));
+ Set_First_Rep_Item (Full, Priv_Item);
-- Otherwise, search to the end of items currently linked to the full
-- subtype and append the private items to the end. However, if Priv
-- and Full already have the same list of rep items, then the append
-- is not done, as that would create a circularity.
+ --
+ -- The partial view may have a predicate and the rep item lists of
+ -- both views agree when inherited from the same ancestor. In that
+ -- case, simply propagate the list from one view to the other.
+ -- A more complex analysis needed here ???
+
+ elsif Present (Priv_Item)
+ and then Item = Next_Rep_Item (Priv_Item)
+ then
+ Set_First_Rep_Item (Full, Priv_Item);
- elsif Item /= First_Rep_Item (Priv) then
+ elsif Item /= Priv_Item then
Append := True;
loop
Next_Item := Next_Rep_Item (Item);
procedure Fixup_Bad_Constraint is
begin
- -- Set a reasonable Ekind for the entity. For an incomplete type,
- -- we can't do much, but for other types, we can set the proper
- -- corresponding subtype kind.
+ -- Set a reasonable Ekind for the entity, including incomplete types.
- if Ekind (T) = E_Incomplete_Type then
- Set_Ekind (Def_Id, Ekind (T));
- else
- Set_Ekind (Def_Id, Subtype_Kind (Ekind (T)));
- end if;
+ Set_Ekind (Def_Id, Subtype_Kind (Ekind (T)));
-- Set Etype to the known type, to reduce chances of cascaded errors
Governed_By => Assoc_List,
Into => Comp_List,
Report_Errors => Errors);
- pragma Assert (not Errors);
+ pragma Assert (not Errors
+ or else Serious_Errors_Detected > 0);
Create_All_Components;
-----------------------
procedure Derive_Subprogram
- (New_Subp : in out Entity_Id;
+ (New_Subp : out Entity_Id;
Parent_Subp : Entity_Id;
Derived_Type : Entity_Id;
Parent_Type : Entity_Id;
or else Is_Internal (Parent_Subp)
or else Is_Private_Overriding
or else Is_Internal_Name (Chars (Parent_Subp))
- or else Nam_In (Chars (Parent_Subp), Name_Initialize,
- Name_Adjust,
- Name_Finalize)
+ or else (Is_Controlled (Parent_Type)
+ and then Nam_In (Chars (Parent_Subp), Name_Adjust,
+ Name_Finalize,
+ Name_Initialize))
then
Set_Derived_Name;
elsif Ada_Version >= Ada_2005
and then Is_Dispatching_Operation (Parent_Subp)
- and then Covers_Some_Interface (Parent_Subp)
+ and then Present (Covered_Interface_Op (Parent_Subp))
then
Set_Derived_Name;
Set_Alias (New_Subp, Actual_Subp);
end if;
- -- Inherit the "ghostness" from the parent subprogram
-
- if Is_Ghost_Entity (Alias (New_Subp)) then
- Set_Is_Ghost_Entity (New_Subp);
- end if;
-
-- Derived subprograms of a tagged type must inherit the convention
-- of the parent subprogram (a requirement of AI-117). Derived
-- subprograms of untagged types simply get convention Ada by default.
New_Overloaded_Entity (New_Subp, Derived_Type);
+ -- Ada RM 6.1.1 (15): If a subprogram inherits nonconforming class-wide
+ -- preconditions and the derived type is abstract, the derived operation
+ -- is abstract as well if parent subprogram is not abstract or null.
+
+ if Is_Abstract_Type (Derived_Type)
+ and then Has_Non_Trivial_Precondition (Parent_Subp)
+ and then Present (Interfaces (Derived_Type))
+ then
+
+ -- Add useful attributes of subprogram before the freeze point,
+ -- in case freezing is delayed or there are previous errors.
+
+ Set_Is_Dispatching_Operation (New_Subp);
+
+ declare
+ Iface_Prim : constant Entity_Id := Covered_Interface_Op (New_Subp);
+
+ begin
+ if Present (Iface_Prim)
+ and then Has_Non_Trivial_Precondition (Iface_Prim)
+ then
+ Set_Is_Abstract_Subprogram (New_Subp);
+ end if;
+ end;
+ end if;
+
-- Check for case of a derived subprogram for the instantiation of a
-- formal derived tagged type, if so mark the subprogram as dispatching
-- and inherit the dispatching attributes of the actual subprogram. The
-- the list of primitives of Derived_Type exactly in the same order.
procedure Derive_Interface_Subprogram
- (New_Subp : in out Entity_Id;
+ (New_Subp : out Entity_Id;
Subp : Entity_Id;
Actual_Subp : Entity_Id);
-- Derive New_Subp from the ultimate alias of the parent subprogram Subp
-- Actual_Subp is the actual subprogram corresponding with the generic
-- subprogram Subp.
+ ------------------------
+ -- Check_Derived_Type --
+ ------------------------
+
function Check_Derived_Type return Boolean is
E : Entity_Id;
Elmt : Elmt_Id;
begin
-- Traverse list of entities in the current scope searching for
- -- an incomplete type whose full-view is derived type
+ -- an incomplete type whose full-view is derived type.
E := First_Entity (Scope (Derived_Type));
while Present (E) and then E /= Derived_Type loop
---------------------------------
procedure Derive_Interface_Subprogram
- (New_Subp : in out Entity_Id;
+ (New_Subp : out Entity_Id;
Subp : Entity_Id;
Actual_Subp : Entity_Id)
is
begin
Parent_Type := Find_Type_Of_Subtype_Indic (Indic);
+ if SPARK_Mode = On
+ and then Is_Tagged_Type (Parent_Type)
+ then
+ declare
+ Partial_View : constant Entity_Id :=
+ Incomplete_Or_Partial_View (Parent_Type);
+
+ begin
+ -- If the partial view was not found then the parent type is not
+ -- a private type. Otherwise check if the partial view is a tagged
+ -- private type.
+
+ if Present (Partial_View)
+ and then Is_Private_Type (Partial_View)
+ and then not Is_Tagged_Type (Partial_View)
+ then
+ Error_Msg_NE
+ ("cannot derive from & declared as untagged private "
+ & "(SPARK RM 3.4(1))", N, Partial_View);
+ end if;
+ end;
+ end if;
+
-- Ada 2005 (AI-251): In case of interface derivation check that the
-- parent is also an interface.
begin
-- Look for the associated private type declaration
- Partial_View := First_Entity (Current_Scope);
- loop
- exit when No (Partial_View)
- or else (Has_Private_Declaration (Partial_View)
- and then Full_View (Partial_View) = T);
-
- Next_Entity (Partial_View);
- end loop;
+ Partial_View := Incomplete_Or_Partial_View (T);
-- If the partial view was not found then the source code has
-- errors and the transformation is not needed.
function Find_Type_Name (N : Node_Id) return Entity_Id is
Id : constant Entity_Id := Defining_Identifier (N);
- Prev : Entity_Id;
New_Id : Entity_Id;
+ Prev : Entity_Id;
Prev_Par : Node_Id;
procedure Check_Duplicate_Aspects;
-- Check that aspects specified in a completion have not been specified
- -- already in the partial view. Type_Invariant and others can be
- -- specified on either view but never on both.
+ -- already in the partial view.
procedure Tag_Mismatch;
- -- Diagnose a tagged partial view whose full view is untagged.
- -- We post the message on the full view, with a reference to
- -- the previous partial view. The partial view can be private
- -- or incomplete, and these are handled in a different manner,
- -- so we determine the position of the error message from the
- -- respective slocs of both.
+ -- Diagnose a tagged partial view whose full view is untagged. We post
+ -- the message on the full view, with a reference to the previous
+ -- partial view. The partial view can be private or incomplete, and
+ -- these are handled in a different manner, so we determine the position
+ -- of the error message from the respective slocs of both.
-----------------------------
-- Check_Duplicate_Aspects --
-----------------------------
procedure Check_Duplicate_Aspects is
- Prev_Aspects : constant List_Id := Aspect_Specifications (Prev_Par);
- Full_Aspects : constant List_Id := Aspect_Specifications (N);
- F_Spec, P_Spec : Node_Id;
+ function Get_Partial_View_Aspect (Asp : Node_Id) return Node_Id;
+ -- Return the corresponding aspect of the partial view which matches
+ -- the aspect id of Asp. Return Empty is no such aspect exists.
+
+ -----------------------------
+ -- Get_Partial_View_Aspect --
+ -----------------------------
+
+ function Get_Partial_View_Aspect (Asp : Node_Id) return Node_Id is
+ Asp_Id : constant Aspect_Id := Get_Aspect_Id (Asp);
+ Prev_Asps : constant List_Id := Aspect_Specifications (Prev_Par);
+ Prev_Asp : Node_Id;
+
+ begin
+ if Present (Prev_Asps) then
+ Prev_Asp := First (Prev_Asps);
+ while Present (Prev_Asp) loop
+ if Get_Aspect_Id (Prev_Asp) = Asp_Id then
+ return Prev_Asp;
+ end if;
+
+ Next (Prev_Asp);
+ end loop;
+ end if;
+
+ return Empty;
+ end Get_Partial_View_Aspect;
+
+ -- Local variables
+
+ Full_Asps : constant List_Id := Aspect_Specifications (N);
+ Full_Asp : Node_Id;
+ Part_Asp : Node_Id;
+
+ -- Start of processing for Check_Duplicate_Aspects
begin
- if Present (Full_Aspects) then
- F_Spec := First (Full_Aspects);
- while Present (F_Spec) loop
- if Present (Prev_Aspects) then
- P_Spec := First (Prev_Aspects);
- while Present (P_Spec) loop
- if Chars (Identifier (P_Spec)) =
- Chars (Identifier (F_Spec))
- then
- Error_Msg_N
- ("aspect already specified in private declaration",
- F_Spec);
- Remove (F_Spec);
- return;
- end if;
+ if Present (Full_Asps) then
+ Full_Asp := First (Full_Asps);
+ while Present (Full_Asp) loop
+ Part_Asp := Get_Partial_View_Aspect (Full_Asp);
- Next (P_Spec);
- end loop;
+ -- An aspect and its class-wide counterpart are two distinct
+ -- aspects and may apply to both views of an entity.
+
+ if Present (Part_Asp)
+ and then Class_Present (Part_Asp) = Class_Present (Full_Asp)
+ then
+ Error_Msg_N
+ ("aspect already specified in private declaration",
+ Full_Asp);
+
+ Remove (Full_Asp);
+ return;
end if;
if Has_Discriminants (Prev)
and then not Has_Unknown_Discriminants (Prev)
- and then Chars (Identifier (F_Spec)) =
- Name_Implicit_Dereference
+ and then Get_Aspect_Id (Full_Asp) =
+ Aspect_Implicit_Dereference
then
- Error_Msg_N ("cannot specify aspect " &
- "if partial view has known discriminants", F_Spec);
+ Error_Msg_N
+ ("cannot specify aspect if partial view has known "
+ & "discriminants", Full_Asp);
end if;
- Next (F_Spec);
+ Next (Full_Asp);
end loop;
end if;
end Check_Duplicate_Aspects;
Set_Ekind (Id, Ekind (Prev)); -- will be reset later
Set_Class_Wide_Type (Id, Class_Wide_Type (Prev));
- -- The type of the classwide type is the current Id. Previously
+ -- Type of the class-wide type is the current Id. Previously
-- this was not done for private declarations because of order-
- -- of elaboration issues in the back-end, but gigi now handles
+ -- of-elaboration issues in the back end, but gigi now handles
-- this properly.
Set_Etype (Class_Wide_Type (Id), Id);
end if;
while Present (Disc) loop
- pragma Assert (Present (Assoc));
+
+ -- If no further associations return the discriminant, value will
+ -- be found on the second pass.
+
+ if No (Assoc) then
+ return Result;
+ end if;
if Original_Record_Component (Disc) = Result_Entity then
return Node (Assoc);
-- ??? This routine is a gigantic mess and will be deleted. For the
-- time being just test for the trivial case before calling recurse.
+ -- We are now celebrating the 20th anniversary of this comment!
+
if Base_Type (Scope (Discriminant)) = Base_Type (Typ_For_Constraint) then
declare
D : Entity_Id;
if not Is_Tagged then
Set_Original_Record_Component (New_C, New_C);
+ Set_Corresponding_Record_Component (New_C, Old_C);
end if;
-- Set the proper type of an access discriminant
and then Original_Record_Component (Corr_Discrim) = Old_C
then
Set_Original_Record_Component (Discrim, New_C);
+ Set_Corresponding_Record_Component (Discrim, Empty);
end if;
Next_Discriminant (Discrim);
is
begin
case T_Kind is
- when Enumeration_Kind |
- Integer_Kind =>
+ when Enumeration_Kind
+ | Integer_Kind
+ =>
return Constraint_Kind = N_Range_Constraint;
when Decimal_Fixed_Point_Kind =>
return Nkind_In (Constraint_Kind, N_Digits_Constraint,
N_Range_Constraint);
- when Access_Kind |
- Array_Kind |
- E_Record_Type |
- E_Record_Subtype |
- Class_Wide_Kind |
- E_Incomplete_Type |
- Private_Kind |
- Concurrent_Kind =>
+ when Access_Kind
+ | Array_Kind
+ | Class_Wide_Kind
+ | Concurrent_Kind
+ | Private_Kind
+ | E_Incomplete_Type
+ | E_Record_Subtype
+ | E_Record_Type
+ =>
return Constraint_Kind = N_Index_Or_Discriminant_Constraint;
when others =>
then
return True;
- -- In the body of an instantiation, no need to check for the visibility
- -- of a component.
+ -- In the body of an instantiation, check the visibility of a component
+ -- in case it has a homograph that is a primitive operation of a private
+ -- type which was not visible in the generic unit.
+
+ -- Should Is_Prefixed_Call be propagated from template to instance???
elsif In_Instance_Body then
- return True;
+ if not Is_Tagged_Type (Original_Type)
+ or else not Is_Private_Type (Original_Type)
+ then
+ return True;
+
+ else
+ declare
+ Subp_Elmt : Elmt_Id;
+
+ begin
+ Subp_Elmt := First_Elmt (Primitive_Operations (Original_Type));
+ while Present (Subp_Elmt) loop
+
+ -- The component is hidden by a primitive operation
+
+ if Chars (Node (Subp_Elmt)) = Chars (C) then
+ return False;
+ end if;
+
+ Next_Elmt (Subp_Elmt);
+ end loop;
+
+ return True;
+ end;
+ end if;
-- If the component has been declared in an ancestor which is currently
-- a private type, then it is not visible. The same applies if the
Set_Freeze_Node (CW_Type, Empty);
-- Customize the class-wide type: It has no prim. op., it cannot be
- -- abstract and its Etype points back to the specific root type.
+ -- abstract, its Etype points back to the specific root type, and it
+ -- cannot have any invariants.
Set_Ekind (CW_Type, E_Class_Wide_Type);
Set_Is_Tagged_Type (CW_Type, True);
Set_Is_Constrained (CW_Type, False);
Set_Is_First_Subtype (CW_Type, Is_First_Subtype (T));
Set_Default_SSO (CW_Type);
+ Set_Has_Inheritable_Invariants (CW_Type, False);
+ Set_Has_Inherited_Invariants (CW_Type, False);
+ Set_Has_Own_Invariants (CW_Type, False);
if Ekind (T) = E_Class_Wide_Subtype then
Set_Etype (CW_Type, Etype (Base_Type (T)));
-- The class-wide type of a class-wide type is itself (RM 3.9(14))
Set_Class_Wide_Type (CW_Type, CW_Type);
-
- -- Inherit the "ghostness" from the root tagged type
-
- if Ghost_Mode > None or else Is_Ghost_Entity (T) then
- Set_Is_Ghost_Entity (CW_Type);
- end if;
end Make_Class_Wide_Type;
----------------
end if;
case Nkind (Original_Node (Exp)) is
- when N_Aggregate | N_Extension_Aggregate | N_Function_Call | N_Op =>
+ when N_Aggregate
+ | N_Extension_Aggregate
+ | N_Function_Call
+ | N_Op
+ =>
return True;
when N_Identifier =>
-- A return statement for a build-in-place function returning a
-- synchronized type also introduces an unchecked conversion.
- when N_Type_Conversion |
- N_Unchecked_Type_Conversion =>
+ when N_Type_Conversion
+ | N_Unchecked_Type_Conversion
+ =>
return not Comes_From_Source (Exp)
and then
OK_For_Limited_Init_In_05
(Typ, Expression (Original_Node (Exp)));
- when N_Indexed_Component |
- N_Selected_Component |
- N_Explicit_Dereference =>
+ when N_Explicit_Dereference
+ | N_Indexed_Component
+ | N_Selected_Component
+ =>
return Nkind (Exp) = N_Function_Call;
-- A use of 'Input is a function call, hence allowed. Normally the
when N_Attribute_Reference =>
return Attribute_Name (Original_Node (Exp)) = Name_Input;
+ -- "return raise ..." is OK
+
+ when N_Raise_Expression =>
+ return True;
+
-- For a case expression, all dependent expressions must be legal
when N_Case_Expression =>
-- Process_Full_View --
-----------------------
+ -- WARNING: This routine manages Ghost regions. Return statements must be
+ -- replaced by gotos which jump to the end of the routine and restore the
+ -- Ghost mode.
+
procedure Process_Full_View (N : Node_Id; Full_T, Priv_T : Entity_Id) is
procedure Collect_Implemented_Interfaces
(Typ : Entity_Id;
-- Local variables
+ Saved_GM : constant Ghost_Mode_Type := Ghost_Mode;
+
Full_Indic : Node_Id;
Full_Parent : Entity_Id;
Priv_Parent : Entity_Id;
-- Start of processing for Process_Full_View
begin
+ Mark_And_Set_Ghost_Completion (N, Priv_T);
+
-- First some sanity checks that must be done after semantic
-- decoration of the full view and thus cannot be placed with other
-- similar checks in Find_Type_Name
-- error situation [7.3(8)].
if Priv_Parent = Any_Type or else Full_Parent = Any_Type then
- return;
+ goto Leave;
-- Ada 2005 (AI-251): Interfaces in the full type can be given in
-- any order. Therefore we don't have to check that its parent must
and then not Is_Ancestor (Base_Type (Priv_Parent), Full_Parent)
then
Error_Msg_N
- ("parent of full type must descend from parent"
- & " of private extension", Full_Indic);
+ ("parent of full type must descend from parent of private "
+ & "extension", Full_Indic);
-- First check a formal restriction, and then proceed with checking
-- Ada rules. Since the formal restriction is not a serious error, we
while Present (Priv_Discr) and then Present (Full_Discr) loop
if Original_Record_Component (Priv_Discr) =
Original_Record_Component (Full_Discr)
- or else
- Corresponding_Discriminant (Priv_Discr) =
- Corresponding_Discriminant (Full_Discr)
+ or else
+ Corresponding_Discriminant (Priv_Discr) =
+ Corresponding_Discriminant (Full_Discr)
then
null;
else
if Present (Priv_Discr) or else Present (Full_Discr) then
Error_Msg_N
- ("full view must inherit discriminants of the parent"
- & " type used in the private extension", Full_Indic);
+ ("full view must inherit discriminants of the parent "
+ & "type used in the private extension", Full_Indic);
elsif Priv_Constr and then not Full_Constr then
Error_Msg_N
-- known or unknown discriminants, then the full type
-- declaration shall define a definite subtype.
- elsif not Has_Unknown_Discriminants (Priv_T)
+ elsif not Has_Unknown_Discriminants (Priv_T)
and then not Has_Discriminants (Priv_T)
and then not Is_Constrained (Full_T)
then
Error_Msg_N
- ("full view must define a constrained type if partial view"
- & " has no discriminants", Full_T);
+ ("full view must define a constrained type if partial view "
+ & "has no discriminants", Full_T);
end if;
-- ??????? Do we implement the following properly ?????
Next_Elmt (Prim_Elmt);
end loop;
- return;
+ goto Leave;
end;
-- For non-concurrent types, transfer explicit primitives, but
Set_Has_Specified_Stream_Output (Full_T);
end if;
- -- Propagate the attributes related to pragma Default_Initial_Condition
- -- from the private to the full view. Note that both flags are mutually
- -- exclusive.
-
- if Has_Default_Init_Cond (Priv_T)
- or else Has_Inherited_Default_Init_Cond (Priv_T)
- then
- Propagate_Default_Init_Cond_Attributes
- (From_Typ => Priv_T,
- To_Typ => Full_T,
- Private_To_Full_View => True);
-
- -- In the case where the full view is derived from another private type,
- -- the attributes related to pragma Default_Initial_Condition must be
- -- propagated from the full to the private view to maintain consistency
- -- of views.
-
- -- package Pack is
- -- type Parent_Typ is private
- -- with Default_Initial_Condition ...;
- -- private
- -- type Parent_Typ is ...;
- -- end Pack;
-
- -- with Pack; use Pack;
- -- package Pack_2 is
- -- type Deriv_Typ is private; -- must inherit
- -- private
- -- type Deriv_Typ is new Parent_Typ; -- must inherit
- -- end Pack_2;
-
- elsif Has_Default_Init_Cond (Full_T)
- or else Has_Inherited_Default_Init_Cond (Full_T)
- then
- Propagate_Default_Init_Cond_Attributes
- (From_Typ => Full_T,
- To_Typ => Priv_T,
- Private_To_Full_View => True);
- end if;
-
- if Is_Ghost_Entity (Priv_T) then
-
- -- The Ghost policy in effect at the point of declaration and at the
- -- point of completion must match (SPARK RM 6.9(14)).
-
- Check_Ghost_Completion (Priv_T, Full_T);
-
- -- Propagate the attributes related to pragma Ghost from the private
- -- to the full view.
+ -- Propagate Default_Initial_Condition-related attributes from the
+ -- partial view to the full view and its base type.
- Mark_Full_View_As_Ghost (Priv_T, Full_T);
- end if;
-
- -- Propagate invariants to full type
+ Propagate_DIC_Attributes (Full_T, From_Typ => Priv_T);
+ Propagate_DIC_Attributes (Base_Type (Full_T), From_Typ => Priv_T);
- if Has_Invariants (Priv_T) then
- Set_Has_Invariants (Full_T);
- Set_Invariant_Procedure (Full_T, Invariant_Procedure (Priv_T));
- end if;
+ -- Propagate invariant-related attributes from the partial view to the
+ -- full view and its base type.
- if Has_Inheritable_Invariants (Priv_T) then
- Set_Has_Inheritable_Invariants (Full_T);
- end if;
+ Propagate_Invariant_Attributes (Full_T, From_Typ => Priv_T);
+ Propagate_Invariant_Attributes (Base_Type (Full_T), From_Typ => Priv_T);
- -- Check hidden inheritance of class-wide type invariants
+ -- AI12-0041: Detect an attempt to inherit a class-wide type invariant
+ -- in the full view without advertising the inheritance in the partial
+ -- view. This can only occur when the partial view has no parent type
+ -- and the full view has an interface as a parent. Any other scenarios
+ -- are illegal because implemented interfaces must match between the
+ -- two views.
- if Ada_Version >= Ada_2012
- and then not Has_Inheritable_Invariants (Full_T)
- and then In_Private_Part (Current_Scope)
- and then Has_Interfaces (Full_T)
- then
+ if Is_Tagged_Type (Priv_T) and then Is_Tagged_Type (Full_T) then
declare
- Ifaces : Elist_Id;
- AI : Elmt_Id;
+ Full_Par : constant Entity_Id := Etype (Full_T);
+ Priv_Par : constant Entity_Id := Etype (Priv_T);
begin
- Collect_Interfaces (Full_T, Ifaces, Exclude_Parents => True);
-
- AI := First_Elmt (Ifaces);
- while Present (AI) loop
- if Has_Inheritable_Invariants (Node (AI)) then
- Error_Msg_N
- ("hidden inheritance of class-wide type invariants " &
- "not allowed", N);
- exit;
- end if;
-
- Next_Elmt (AI);
- end loop;
+ if not Is_Interface (Priv_Par)
+ and then Is_Interface (Full_Par)
+ and then Has_Inheritable_Invariants (Full_Par)
+ then
+ Error_Msg_N
+ ("hidden inheritance of class-wide type invariants not "
+ & "allowed", N);
+ end if;
end;
end if;
Set_Predicate_Function (Full_T, Predicate_Function (Priv_T));
end if;
end if;
+
+ <<Leave>>
+ Restore_Ghost_Mode (Saved_GM);
end Process_Full_View;
-----------------------------------
-- Ada 2005 (AI-412): Transform a regular incomplete subtype into a
-- corresponding subtype of the full view.
- elsif Ekind (Priv_Dep) = E_Incomplete_Subtype then
+ elsif Ekind (Priv_Dep) = E_Incomplete_Subtype
+ and then Comes_From_Source (Priv_Dep)
+ then
Set_Subtype_Indication
(Parent (Priv_Dep), New_Occurrence_Of (Full_T, Sloc (Priv_Dep)));
Set_Etype (Priv_Dep, Full_T);
Set_Ekind (Priv_Dep, Subtype_Kind (Ekind (Full_T)));
Set_Analyzed (Parent (Priv_Dep), False);
- -- Reanalyze the declaration, suppressing the call to
- -- Enter_Name to avoid duplicate names.
+ -- Reanalyze the declaration, suppressing the call to Enter_Name
+ -- to avoid duplicate names.
Analyze_Subtype_Declaration
(N => Parent (Priv_Dep),
Constrain_Integer (Def_Id, S);
Inherit_Predicate_Flags (Def_Id, Subtype_Mark_Id);
- when E_Record_Type |
- E_Record_Subtype |
- Class_Wide_Kind |
- E_Incomplete_Type =>
+ when Class_Wide_Kind
+ | E_Incomplete_Type
+ | E_Record_Subtype
+ | E_Record_Type
+ =>
Constrain_Discriminated_Type (Def_Id, S, Related_Nod);
if Ekind (Def_Id) = E_Incomplete_Type then
end if;
end Process_Subtype;
- --------------------------------------------
- -- Propagate_Default_Init_Cond_Attributes --
- --------------------------------------------
-
- procedure Propagate_Default_Init_Cond_Attributes
- (From_Typ : Entity_Id;
- To_Typ : Entity_Id;
- Parent_To_Derivation : Boolean := False;
- Private_To_Full_View : Boolean := False)
- is
- procedure Remove_Default_Init_Cond_Procedure (Typ : Entity_Id);
- -- Remove the default initial procedure (if any) from the rep chain of
- -- type Typ.
-
- ----------------------------------------
- -- Remove_Default_Init_Cond_Procedure --
- ----------------------------------------
-
- procedure Remove_Default_Init_Cond_Procedure (Typ : Entity_Id) is
- Found : Boolean := False;
- Prev : Entity_Id;
- Subp : Entity_Id;
-
- begin
- Prev := Typ;
- Subp := Subprograms_For_Type (Typ);
- while Present (Subp) loop
- if Is_Default_Init_Cond_Procedure (Subp) then
- Found := True;
- exit;
- end if;
-
- Prev := Subp;
- Subp := Subprograms_For_Type (Subp);
- end loop;
-
- if Found then
- Set_Subprograms_For_Type (Prev, Subprograms_For_Type (Subp));
- Set_Subprograms_For_Type (Subp, Empty);
- end if;
- end Remove_Default_Init_Cond_Procedure;
-
- -- Local variables
-
- Inherit_Procedure : Boolean := False;
-
- -- Start of processing for Propagate_Default_Init_Cond_Attributes
-
- begin
- if Has_Default_Init_Cond (From_Typ) then
-
- -- A derived type inherits the attributes from its parent type
-
- if Parent_To_Derivation then
- Set_Has_Inherited_Default_Init_Cond (To_Typ);
-
- -- A full view shares the attributes with its private view
-
- else
- Set_Has_Default_Init_Cond (To_Typ);
- end if;
-
- Inherit_Procedure := True;
-
- -- Due to the order of expansion, a derived private type is processed
- -- by two routines which both attempt to set the attributes related
- -- to pragma Default_Initial_Condition - Build_Derived_Type and then
- -- Process_Full_View.
-
- -- package Pack is
- -- type Parent_Typ is private
- -- with Default_Initial_Condition ...;
- -- private
- -- type Parent_Typ is ...;
- -- end Pack;
-
- -- with Pack; use Pack;
- -- package Pack_2 is
- -- type Deriv_Typ is private
- -- with Default_Initial_Condition ...;
- -- private
- -- type Deriv_Typ is new Parent_Typ;
- -- end Pack_2;
-
- -- When Build_Derived_Type operates, it sets the attributes on the
- -- full view without taking into account that the private view may
- -- define its own default initial condition procedure. This becomes
- -- apparent in Process_Full_View which must undo some of the work by
- -- Build_Derived_Type and propagate the attributes from the private
- -- to the full view.
-
- if Private_To_Full_View then
- Set_Has_Inherited_Default_Init_Cond (To_Typ, False);
- Remove_Default_Init_Cond_Procedure (To_Typ);
- end if;
-
- -- A type must inherit the default initial condition procedure from a
- -- parent type when the parent itself is inheriting the procedure or
- -- when it is defining one. This circuitry is also used when dealing
- -- with the private / full view of a type.
-
- elsif Has_Inherited_Default_Init_Cond (From_Typ)
- or (Parent_To_Derivation
- and Present (Get_Pragma
- (From_Typ, Pragma_Default_Initial_Condition)))
- then
- Set_Has_Inherited_Default_Init_Cond (To_Typ);
- Inherit_Procedure := True;
- end if;
-
- if Inherit_Procedure
- and then No (Default_Init_Cond_Procedure (To_Typ))
- then
- Set_Default_Init_Cond_Procedure
- (To_Typ, Default_Init_Cond_Procedure (From_Typ));
- end if;
- end Propagate_Default_Init_Cond_Attributes;
-
-----------------------------
-- Record_Type_Declaration --
-----------------------------
Set_Interfaces (T, No_Elist);
Set_Stored_Constraint (T, No_Elist);
Set_Default_SSO (T);
+ Set_No_Reordering (T, No_Component_Reordering);
-- Normal case
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