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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                             S E M _ C H 1 2                              --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 1992-2011, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
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-- for  more details.  You should have  received  a copy of the GNU General --
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-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license.          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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with Inline; use Inline;
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with Types;  use Types;
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package Sem_Ch12 is
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   procedure Analyze_Generic_Package_Declaration        (N : Node_Id);
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   procedure Analyze_Generic_Subprogram_Declaration     (N : Node_Id);
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   procedure Analyze_Package_Instantiation              (N : Node_Id);
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   procedure Analyze_Procedure_Instantiation            (N : Node_Id);
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   procedure Analyze_Function_Instantiation             (N : Node_Id);
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   procedure Analyze_Formal_Object_Declaration          (N : Node_Id);
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   procedure Analyze_Formal_Type_Declaration            (N : Node_Id);
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   procedure Analyze_Formal_Subprogram_Declaration      (N : Node_Id);
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   procedure Analyze_Formal_Package_Declaration         (N : Node_Id);
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   procedure Start_Generic;
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   --  Must be invoked before starting to process a generic spec or body
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   procedure End_Generic;
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   --  Must be invoked just at the end of the end of the processing of a
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   --  generic spec or body.
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   procedure Check_Generic_Child_Unit
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     (Gen_Id           : Node_Id;
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      Parent_Installed : in out Boolean);
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   --  If the name of the generic unit in an instantiation or a renaming is a
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   --  selected component, then the prefix may be an instance and the selector
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   --  may designate a child unit. Retrieve the parent generic and search for
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   --  the child unit that must be declared within. Similarly, if this is the
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   --  name of a generic child unit within an instantiation of its own parent,
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   --  retrieve the parent generic. If the parent is installed as a result of
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   --  this call, then Parent_Installed is set True, otherwise Parent_Installed
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   --  is unchanged by the call.
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   function Copy_Generic_Node
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     (N             : Node_Id;
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      Parent_Id     : Node_Id;
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      Instantiating : Boolean) return Node_Id;
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   --  Copy the tree for a generic unit or its body. The unit is copied
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   --  repeatedly: once to produce a copy on which semantic analysis of
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   --  the generic is performed, and once for each instantiation. The tree
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   --  being copied is not semantically analyzed, except that references to
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   --  global entities are marked on terminal nodes. Note that this function
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   --  copies any aspect specifications from the input node N to the returned
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   --  node, as well as the setting of the Has_Aspects flag.
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   function Get_Instance_Of (A : Entity_Id) return Entity_Id;
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   --  Retrieve actual associated with given generic parameter.
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   --  If A is uninstantiated or not a generic parameter, return A.
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   function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;
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   --  Given the entity of a unit that is an instantiation, retrieve the
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   --  original instance node. This is used when loading the instantiations
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   --  of the ancestors of a child generic that is being instantiated.
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   procedure Instantiate_Package_Body
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     (Body_Info     : Pending_Body_Info;
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      Inlined_Body  : Boolean := False;
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      Body_Optional : Boolean := False);
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   --  Called after semantic analysis, to complete the instantiation of
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   --  package instances. The flag Inlined_Body is set if the body is
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   --  being instantiated on the fly for inlined purposes.
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   --
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   --  The flag Body_Optional indicates that the call is for an instance
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   --  that precedes the current instance in the same declarative part.
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   --  This call is needed when instantiating a nested generic whose body
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   --  is to be found in the body of an instance. Normally we instantiate
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   --  package bodies only when they appear in the main unit, or when their
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   --  contents are needed for a nested generic G. If unit U contains several
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   --  instances I1, I2, etc. and I2 contains a nested generic, then when U
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   --  appears in the context of some other unit P that contains an instance
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   --  of G, we compile the body of I2, but not that of I1. However, when we
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   --  compile U as the main unit, we compile both bodies. This will lead to
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   --  lead to link-time errors if the compilation of I1 generates public
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   --  symbols, because those in I2 will receive different names in both
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   --  cases. This forces us to analyze the body of I1 even when U is not the
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   --  main unit. We don't want this additional mechanism to generate an error
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   --  when the body of the generic for I1 is not present, and this is the
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   --  reason for the presence of the flag Body_Optional, which is exchanged
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   --  between the current procedure and Load_Parent_Of_Generic.
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   procedure Instantiate_Subprogram_Body
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     (Body_Info     : Pending_Body_Info;
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      Body_Optional : Boolean := False);
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   --  Called after semantic analysis, to complete the instantiation of
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   --  function and procedure instances. The flag Body_Optional has the
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   --  same purpose as described for Instantiate_Package_Body.
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   function Need_Subprogram_Instance_Body
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     (N    : Node_Id;
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      Subp : Entity_Id) return Boolean;
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   --  If a subprogram instance is inlined, indicate that the body of it
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   --  must be created, to be used in inlined calls by the back-end. The
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   --  subprogram may be inlined because the generic itself carries the
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   --  pragma, or because a pragma appears for the instance in the scope.
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   --  of the instance.
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   procedure Save_Global_References (N : Node_Id);
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   --  Traverse the original generic unit, and capture all references to
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   --  entities that are defined outside of the generic in the analyzed
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   --  tree for the template. These references are copied into the original
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   --  tree, so that they appear automatically in every instantiation.
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   --  A critical invariant in this approach is that if an id in the generic
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   --  resolves to a local entity, the corresponding id in the instance
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   --  will resolve to the homologous entity in the instance, even though
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   --  the enclosing context for resolution is different, as long as the
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   --  global references have been captured as described here.
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   --  Because instantiations can be nested, the environment of the instance,
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   --  involving the actuals and other data-structures, must be saved and
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   --  restored in stack-like fashion. Front-end inlining also uses these
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   --  structures for the management of private/full views.
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   procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id);
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   --  This procedure is used when a subprogram body is inlined. This process
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   --  shares the same circuitry as the creation of an instantiated copy of
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   --  a generic template. The call to this procedure establishes a new source
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   --  file entry representing the inlined body as an instantiation, marked as
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   --  an inlined body (so that errout can distinguish cases for generating
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   --  error messages, otherwise the treatment is identical). In this call
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   --  N is the subprogram body and E is the defining identifier of the
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   --  subprogram in question. The resulting Sloc adjustment factor is
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   --  saved as part of the internal state of the Sem_Ch12 package for use
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   --  in subsequent calls to copy nodes.
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   procedure Save_Env
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     (Gen_Unit : Entity_Id;
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      Act_Unit : Entity_Id);
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   --  Because instantiations can be nested, the compiler maintains a stack
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   --  of environments that holds variables relevant to the current instance:
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   --  most importanty Instantiated_Parent, Exchanged_Views, Hidden_Entities,
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   --  and others (see full list in Instance_Env).
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   procedure Restore_Env;
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   --  After processing an instantiation, or aborting one because of semantic
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   --  errors, remove the current Instantiation_Env from Instantation_Envs.
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   procedure Initialize;
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   --  Initializes internal data structures
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   procedure Check_Private_View (N : Node_Id);
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   --  Check whether the type of a generic entity has a different view between
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   --  the point of generic analysis and the point of instantiation. If the
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   --  view has changed, then at the point of instantiation we restore the
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   --  correct view to perform semantic analysis of the instance, and reset
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   --  the current view after instantiation. The processing is driven by the
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   --  current private status of the type of the node, and Has_Private_View,
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   --  a flag that is set at the point of generic compilation. If view and
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   --  flag are inconsistent then the type is updated appropriately.
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   --
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   --  This subprogram is used in Check_Generic_Actuals and Copy_Generic_Node,
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   --  and is exported here for the purpose of front-end inlining (see Exp_Ch6.
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   --  Expand_Inlined_Call.Process_Formals).
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end Sem_Ch12;

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