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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S E M _ C H 1 2 --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2013, 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;
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