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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             S E M _ C H 1 2                              --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2011, 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- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Inline; use Inline;

with Types;  use Types;

package Sem_Ch12 is

   procedure Analyze_Generic_Package_Declaration        (N : Node_Id);

   procedure Analyze_Generic_Subprogram_Declaration     (N : Node_Id);

   procedure Analyze_Package_Instantiation              (N : Node_Id);

   procedure Analyze_Procedure_Instantiation            (N : Node_Id);

   procedure Analyze_Function_Instantiation             (N : Node_Id);

   procedure Analyze_Formal_Object_Declaration          (N : Node_Id);

   procedure Analyze_Formal_Type_Declaration            (N : Node_Id);

   procedure Analyze_Formal_Subprogram_Declaration      (N : Node_Id);

   procedure Analyze_Formal_Package_Declaration         (N : Node_Id);

   procedure Start_Generic;

   --  Must be invoked before starting to process a generic spec or body

   procedure End_Generic;

   --  Must be invoked just at the end of the end of the processing of a

   --  generic spec or body.

   procedure Check_Generic_Child_Unit

     (Gen_Id           : Node_Id;

      Parent_Installed : in out Boolean);

   --  If the name of the generic unit in an instantiation or a renaming is a

   --  selected component, then the prefix may be an instance and the selector

   --  may designate a child unit. Retrieve the parent generic and search for

   --  the child unit that must be declared within. Similarly, if this is the

   --  name of a generic child unit within an instantiation of its own parent,

   --  retrieve the parent generic. If the parent is installed as a result of

   --  this call, then Parent_Installed is set True, otherwise Parent_Installed

   --  is unchanged by the call.

   function Copy_Generic_Node

     (N             : Node_Id;

      Parent_Id     : Node_Id;

      Instantiating : Boolean) return Node_Id;

   --  Copy the tree for a generic unit or its body. The unit is copied

   --  repeatedly: once to produce a copy on which semantic analysis of

   --  the generic is performed, and once for each instantiation. The tree

   --  being copied is not semantically analyzed, except that references to

   --  global entities are marked on terminal nodes. Note that this function

   --  copies any aspect specifications from the input node N to the returned

   --  node, as well as the setting of the Has_Aspects flag.

   function Get_Instance_Of (A : Entity_Id) return Entity_Id;

   --  Retrieve actual associated with given generic parameter.

   --  If A is uninstantiated or not a generic parameter, return A.

   function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;

   --  Given the entity of a unit that is an instantiation, retrieve the

   --  original instance node. This is used when loading the instantiations

   --  of the ancestors of a child generic that is being instantiated.

   procedure Instantiate_Package_Body

     (Body_Info     : Pending_Body_Info;

      Inlined_Body  : Boolean := False;

      Body_Optional : Boolean := False);

   --  Called after semantic analysis, to complete the instantiation of

   --  package instances. The flag Inlined_Body is set if the body is

   --  being instantiated on the fly for inlined purposes.

   --

   --  The flag Body_Optional indicates that the call is for an instance

   --  that precedes the current instance in the same declarative part.

   --  This call is needed when instantiating a nested generic whose body

   --  is to be found in the body of an instance. Normally we instantiate

   --  package bodies only when they appear in the main unit, or when their

   --  contents are needed for a nested generic G. If unit U contains several

   --  instances I1, I2, etc. and I2 contains a nested generic, then when U

   --  appears in the context of some other unit P that contains an instance

   --  of G, we compile the body of I2, but not that of I1. However, when we

   --  compile U as the main unit, we compile both bodies. This will lead to

   --  lead to link-time errors if the compilation of I1 generates public

   --  symbols, because those in I2 will receive different names in both

   --  cases. This forces us to analyze the body of I1 even when U is not the

   --  main unit. We don't want this additional mechanism to generate an error

   --  when the body of the generic for I1 is not present, and this is the

   --  reason for the presence of the flag Body_Optional, which is exchanged

   --  between the current procedure and Load_Parent_Of_Generic.

   procedure Instantiate_Subprogram_Body

     (Body_Info     : Pending_Body_Info;

      Body_Optional : Boolean := False);

   --  Called after semantic analysis, to complete the instantiation of

   --  function and procedure instances. The flag Body_Optional has the

   --  same purpose as described for Instantiate_Package_Body.

   function Need_Subprogram_Instance_Body

     (N    : Node_Id;

      Subp : Entity_Id) return Boolean;

   --  If a subprogram instance is inlined, indicate that the body of it

   --  must be created, to be used in inlined calls by the back-end. The

   --  subprogram may be inlined because the generic itself carries the

   --  pragma, or because a pragma appears for the instance in the scope.

   --  of the instance.

   procedure Save_Global_References (N : Node_Id);

   --  Traverse the original generic unit, and capture all references to

   --  entities that are defined outside of the generic in the analyzed

   --  tree for the template. These references are copied into the original

   --  tree, so that they appear automatically in every instantiation.

   --  A critical invariant in this approach is that if an id in the generic

   --  resolves to a local entity, the corresponding id in the instance

   --  will resolve to the homologous entity in the instance, even though

   --  the enclosing context for resolution is different, as long as the

   --  global references have been captured as described here.

   --  Because instantiations can be nested, the environment of the instance,

   --  involving the actuals and other data-structures, must be saved and

   --  restored in stack-like fashion. Front-end inlining also uses these

   --  structures for the management of private/full views.

   procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id);

   --  This procedure is used when a subprogram body is inlined. This process

   --  shares the same circuitry as the creation of an instantiated copy of

   --  a generic template. The call to this procedure establishes a new source

   --  file entry representing the inlined body as an instantiation, marked as

   --  an inlined body (so that errout can distinguish cases for generating

   --  error messages, otherwise the treatment is identical). In this call

   --  N is the subprogram body and E is the defining identifier of the

   --  subprogram in question. The resulting Sloc adjustment factor is

   --  saved as part of the internal state of the Sem_Ch12 package for use

   --  in subsequent calls to copy nodes.

   procedure Save_Env

     (Gen_Unit : Entity_Id;

      Act_Unit : Entity_Id);

   --  Because instantiations can be nested, the compiler maintains a stack

   --  of environments that holds variables relevant to the current instance:

   --  most importanty Instantiated_Parent, Exchanged_Views, Hidden_Entities,

   --  and others (see full list in Instance_Env).

   procedure Restore_Env;

   --  After processing an instantiation, or aborting one because of semantic

   --  errors, remove the current Instantiation_Env from Instantation_Envs.

   procedure Initialize;

   --  Initializes internal data structures

   procedure Check_Private_View (N : Node_Id);

   --  Check whether the type of a generic entity has a different view between

   --  the point of generic analysis and the point of instantiation. If the

   --  view has changed, then at the point of instantiation we restore the

   --  correct view to perform semantic analysis of the instance, and reset

   --  the current view after instantiation. The processing is driven by the

   --  current private status of the type of the node, and Has_Private_View,

   --  a flag that is set at the point of generic compilation. If view and

   --  flag are inconsistent then the type is updated appropriately.

   --

   --  This subprogram is used in Check_Generic_Actuals and Copy_Generic_Node,

   --  and is exported here for the purpose of front-end inlining (see Exp_Ch6.

   --  Expand_Inlined_Call.Process_Formals).

end Sem_Ch12;