gcc/ada/sem_ch6.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              S E M _ C H 6                               --
   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 Types; use Types;
  28 package Sem_Ch6 is
  29
  30    procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id);
  31    procedure Analyze_Function_Call                   (N : Node_Id);
  32    procedure Analyze_Operator_Symbol                 (N : Node_Id);
  33    procedure Analyze_Parameter_Association           (N : Node_Id);
  34    procedure Analyze_Procedure_Call                  (N : Node_Id);
  35    procedure Analyze_Return_Statement                (N : Node_Id);
  36    procedure Analyze_Subprogram_Declaration          (N : Node_Id);
  37    procedure Analyze_Subprogram_Body                 (N : Node_Id);
  38
  39    function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id;
  40    --  Analyze subprogram specification in both subprogram declarations
  41    --  and body declarations. Returns the defining entity for the spec.
  42
  43    procedure Cannot_Inline (Msg : String; N : Node_Id; Subp : Entity_Id);
  44    --  This procedure is called if the node N, an instance of a call to
  45    --  subprogram Subp, cannot be inlined. Msg is the message to be issued,
  46    --  and has a ? as the last character. If Subp has a pragma Always_Inlined,
  47    --  then an error message is issued (by removing the last character of Msg).
  48    --  If Subp is not Always_Inlined, then a warning is issued if the flag
  49    --  Ineffective_Inline_Warnings is set, and if not, the call has no effect.
  50
  51    procedure Check_Delayed_Subprogram (Designator : Entity_Id);
  52    --  Designator can be a E_Subrpgram_Type, E_Procedure or E_Function. If a
  53    --  type in its profile depends on a private type without a full
  54    --  declaration, indicate that the subprogram is delayed.
  55
  56    procedure Check_Discriminant_Conformance
  57      (N        : Node_Id;
  58       Prev     : Entity_Id;
  59       Prev_Loc : Node_Id);
  60    --  Check that the discriminants of a full type N fully conform to
  61    --  the discriminants of the corresponding partial view Prev.
  62    --  Prev_Loc indicates the source location of the partial view,
  63    --  which may be different than Prev in the case of private types.
  64
  65    procedure Check_Fully_Conformant
  66      (New_Id  : Entity_Id;
  67       Old_Id  : Entity_Id;
  68       Err_Loc : Node_Id := Empty);
  69    --  Check that two callable entitites (subprograms, entries, literals)
  70    --  are fully conformant, post error message if not (RM 6.3.1(17)) with
  71    --  the flag being placed on the Err_Loc node if it is specified, and
  72    --  on the appropriate component of the New_Id construct if not. Note:
  73    --  when checking spec/body conformance, New_Id must be the body entity
  74    --  and Old_Id is the spec entity (the code in the implementation relies
  75    --  on this ordering, and in any case, this makes sense, since if flags
  76    --  are to be placed on the construct, they clearly belong on the body.
  77
  78    procedure Check_Mode_Conformant
  79      (New_Id   : Entity_Id;
  80       Old_Id   : Entity_Id;
  81       Err_Loc  : Node_Id := Empty;
  82       Get_Inst : Boolean := False);
  83    --  Check that two callable entitites (subprograms, entries, literals)
  84    --  are mode conformant, post error message if not (RM 6.3.1(15)) with
  85    --  the flag being placed on the Err_Loc node if it is specified, and
  86    --  on the appropriate component of the New_Id construct if not. The
  87    --  argument Get_Inst is set to True when this is a check against a
  88    --  formal access-to-subprogram type, indicating that mapping of types
  89    --  is needed.
  90
  91    procedure Check_Subtype_Conformant
  92      (New_Id  : Entity_Id;
  93       Old_Id  : Entity_Id;
  94       Err_Loc : Node_Id := Empty);
  95    --  Check that two callable entitites (subprograms, entries, literals)
  96    --  are subtype conformant, post error message if not (RM 6.3.1(16))
  97    --  the flag being placed on the Err_Loc node if it is specified, and
  98    --  on the appropriate component of the New_Id construct if not.
  99
 100    procedure Check_Type_Conformant
 101      (New_Id  : Entity_Id;
 102       Old_Id  : Entity_Id;
 103       Err_Loc : Node_Id := Empty);
 104    --  Check that two callable entitites (subprograms, entries, literals)
 105    --  are type conformant, post error message if not (RM 6.3.1(14)) with
 106    --  the flag being placed on the Err_Loc node if it is specified, and
 107    --  on the appropriate component of the New_Id construct if not.
 108
 109    procedure Create_Extra_Formals (E : Entity_Id);
 110    --  For each parameter of a subprogram or entry that requires an additional
 111    --  formal (such as for access parameters and indefinite discriminated
 112    --  parameters), creates the appropriate formal and attach it to its
 113    --  associated parameter. Each extra formal will also be appended to
 114    --  the end of Subp's parameter list (with each subsequent extra formal
 115    --  being attached to the preceding extra formal).
 116
 117    function Find_Corresponding_Spec (N : Node_Id) return Entity_Id;
 118    --  Use the subprogram specification in the body to retrieve the previous
 119    --  subprogram declaration, if any.
 120
 121    function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean;
 122    --  Determine whether two callable entities (subprograms, entries,
 123    --  literals) are fully conformant (RM 6.3.1(17))
 124
 125    function Fully_Conformant_Expressions
 126      (Given_E1 : Node_Id;
 127       Given_E2 : Node_Id)
 128       return     Boolean;
 129    --  Determines if two (non-empty) expressions are fully conformant
 130    --  as defined by (RM 6.3.1(18-21))
 131
 132    function Fully_Conformant_Discrete_Subtypes
 133       (Given_S1 : Node_Id;
 134        Given_S2 : Node_Id)
 135        return Boolean;
 136    --  Determines if two subtype definitions are fully conformant. Used
 137    --  for entry family conformance checks (RM 6.3.1 (24)).
 138
 139    function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean;
 140    --  Determine whether two callable entities (subprograms, entries,
 141    --  literals) are mode conformant (RM 6.3.1(15))
 142
 143    procedure New_Overloaded_Entity
 144      (S            : Entity_Id;
 145       Derived_Type : Entity_Id := Empty);
 146    --  Process new overloaded entity. Overloaded entities are created
 147    --  by enumeration type declarations, subprogram specifications,
 148    --  entry declarations, and (implicitly) by type derivations.
 149    --  If Derived_Type is not Empty, then it indicates that this
 150    --  is subprogram derived for that type.
 151
 152    procedure Process_Formals (T : List_Id; Related_Nod : Node_Id);
 153    --  Enter the formals in the scope of the subprogram or entry, and
 154    --  analyze default expressions if any. The implicit types created for
 155    --  access parameter are attached to the Related_Nod which comes from the
 156    --  context.
 157
 158    procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id);
 159    --  If the formals of a subprogram are unconstrained, build a subtype
 160    --  declaration that uses the bounds or discriminants of the actual to
 161    --  construct an actual subtype for them. This is an optimization that
 162    --  is done only in some cases where the actual subtype cannot change
 163    --  during execution of the subprogram. By setting the actual subtype
 164    --  once, we avoid recomputing it unnecessarily.
 165
 166    procedure Set_Formal_Mode (Formal_Id : Entity_Id);
 167    --  Set proper Ekind to reflect formal mode (in, out, in out)
 168
 169    function Subtype_Conformant (New_Id, Old_Id : Entity_Id) return Boolean;
 170    --  Determine whether two callable entities (subprograms, entries,
 171    --  literals) are subtype conformant (RM6.3.1(16))
 172
 173    function Type_Conformant (New_Id, Old_Id : Entity_Id) return Boolean;
 174    --  Determine whether two callable entities (subprograms, entries,
 175    --  literals) are type conformant (RM6.3.1(14))
 176
 177    procedure Valid_Operator_Definition (Designator : Entity_Id);
 178    --  Verify that an operator definition has the proper number of formals
 179
 180 end Sem_Ch6;