gcc/ada/sem_ch12.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             S E M _ C H 1 2                              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2003 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 with Inline; use Inline;
  28 with Types;  use Types;
  29
  30 package Sem_Ch12 is
  31    procedure Analyze_Generic_Package_Declaration        (N : Node_Id);
  32    procedure Analyze_Generic_Subprogram_Declaration     (N : Node_Id);
  33    procedure Analyze_Package_Instantiation              (N : Node_Id);
  34    procedure Analyze_Procedure_Instantiation            (N : Node_Id);
  35    procedure Analyze_Function_Instantiation             (N : Node_Id);
  36    procedure Analyze_Formal_Object_Declaration          (N : Node_Id);
  37    procedure Analyze_Formal_Type_Declaration            (N : Node_Id);
  38    procedure Analyze_Formal_Subprogram                  (N : Node_Id);
  39    procedure Analyze_Formal_Package                     (N : Node_Id);
  40
  41    procedure Start_Generic;
  42    --  Must be invoked before starting to process a generic spec or body.
  43
  44    procedure End_Generic;
  45    --  Must be invoked just at the end of the end of the processing of a
  46    --  generic spec or body.
  47
  48    procedure Check_Generic_Child_Unit
  49      (Gen_Id           : Node_Id;
  50       Parent_Installed : in out Boolean);
  51    --  If the name of the generic unit in an instantiation or a renaming
  52    --  is a selected component, then the prefix may be an instance and the
  53    --  selector may  designate a child unit. Retrieve the parent generic
  54    --  and search for the child unit that must be declared within. Similarly,
  55    --  if this is the name of a generic child unit within an instantiation of
  56    --  its own parent, retrieve the parent generic.
  57
  58    function Copy_Generic_Node
  59      (N             : Node_Id;
  60       Parent_Id     : Node_Id;
  61       Instantiating : Boolean)
  62       return          Node_Id;
  63    --  Copy the tree for a generic unit or its body. The unit is copied
  64    --  repeatedly: once to produce a copy on which semantic analysis of
  65    --  the generic is performed, and once for each instantiation. The tree
  66    --  being copied is not semantically analyzed, except that references to
  67    --  global entities are marked on terminal nodes.
  68
  69    function Get_Instance_Of (A : Entity_Id) return Entity_Id;
  70    --  Retrieve actual associated with given generic parameter.
  71    --  If A is uninstantiated or not a generic parameter, return A.
  72
  73    procedure Instantiate_Package_Body
  74      (Body_Info    : Pending_Body_Info;
  75       Inlined_Body : Boolean := False);
  76    --  Called after semantic analysis, to complete the instantiation of
  77    --  package instances. The flag Inlined_Body is set if the body is
  78    --  being instantiated on the fly for inlined purposes.
  79
  80    procedure Instantiate_Subprogram_Body
  81      (Body_Info : Pending_Body_Info);
  82    --  Called after semantic analysis, to complete the instantiation of
  83    --  function and procedure instances.
  84
  85    procedure Save_Global_References (N : Node_Id);
  86    --  Traverse the original generic unit, and capture all references to
  87    --  entities that are defined outside of the generic in the analyzed
  88    --  tree for the template. These references are copied into the original
  89    --  tree, so that they appear automatically in every instantiation.
  90    --  A critical invariant in this approach is that if an id in the generic
  91    --  resolves to a local entity, the corresponding id in the instance
  92    --  will resolve to the homologous entity in the instance, even though
  93    --  the enclosing context for resolution is different, as long as the
  94    --  global references have been captured as described here.
  95
  96    --  Because instantiations can be nested, the environment of the instance,
  97    --  involving the actuals and other data-structures, must be saved and
  98    --  restored in stack-like fashion. Front-end inlining also uses these
  99    --  structures for the management of private/full views.
 100
 101    procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id);
 102    --  This procedure is used when a subprogram body is inlined. This process
 103    --  shares the same circuitry as the creation of an instantiated copy of
 104    --  a generic template. The call to this procedure establishes a new source
 105    --  file entry representing the inlined body as an instantiation, marked as
 106    --  an inlined body (so that errout can distinguish cases for generating
 107    --  error messages, otherwise the treatment is identical). In this call
 108    --  N is the subprogram body and E is the defining identifier of the
 109    --  subprogram in quiestion. The resulting Sloc adjustment factor is
 110    --  saved as part of the internal state of the Sem_Ch12 package for use
 111    --  in subsequent calls to copy nodes.
 112
 113    procedure Save_Env
 114      (Gen_Unit : Entity_Id;
 115       Act_Unit : Entity_Id);
 116    --   ??? comment needed
 117
 118    procedure Restore_Env;
 119    --   ??? comment needed
 120
 121    procedure Initialize;
 122    --  Initializes internal data structures
 123
 124 end Sem_Ch12;