gcc/ada/exp_ch11.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             E X P _ C H 1 1                              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2000 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 --  Expand routines for chapter 11 constructs
  28
  29 with Types; use Types;
  30
  31 package Exp_Ch11 is
  32    procedure Expand_N_Exception_Declaration          (N : Node_Id);
  33    procedure Expand_N_Handled_Sequence_Of_Statements (N : Node_Id);
  34    procedure Expand_N_Raise_Constraint_Error         (N : Node_Id);
  35    procedure Expand_N_Raise_Program_Error            (N : Node_Id);
  36    procedure Expand_N_Raise_Statement                (N : Node_Id);
  37    procedure Expand_N_Raise_Storage_Error            (N : Node_Id);
  38    procedure Expand_N_Subprogram_Info                (N : Node_Id);
  39
  40    --  Data structures for gathering information to build exception tables
  41    --  See runtime routine Ada.Exceptions for full details on the format and
  42    --  content of these tables.
  43
  44    procedure Initialize;
  45    --  Initializes these data structures for a new main unit file
  46
  47    procedure Expand_At_End_Handler (HSS : Node_Id; Block : Node_Id);
  48    --  Given a handled statement sequence, HSS, for which the At_End_Proc
  49    --  field is set, and which currently has no exception handlers, this
  50    --  procedure expands the special exception handler required.
  51    --  This procedure also create a new scope for the given Block, if
  52    --  Block is not Empty.
  53
  54    procedure Expand_Exception_Handlers (HSS : Node_Id);
  55    --  This procedure expands exception handlers, and is called as part
  56    --  of the processing for Expand_N_Handled_Sequence_Of_Statements and
  57    --  is also called from Expand_At_End_Handler. N is the handled sequence
  58    --  of statements that has the exception handler(s) to be expanded. This
  59    --  is also called to expand the special exception handler built for
  60    --  accept bodies (see Exp_Ch9.Build_Accept_Body).
  61
  62    procedure Generate_Unit_Exception_Table;
  63    --  Procedure called by main driver to generate unit exception table if
  64    --  zero cost exceptions are enabled. See System.Exceptions for details.
  65
  66    function Is_Non_Ada_Error (E : Entity_Id) return Boolean;
  67    --  This function is provided for Gigi use. It returns True if operating on
  68    --  VMS, and the argument E is the entity for System.Aux_Dec.Non_Ada_Error.
  69    --  This is used to generate the special matching code for this exception.
  70
  71    procedure Remove_Handler_Entries (N : Node_Id);
  72    --  This procedure is called when optimization circuits determine that
  73    --  an entire subtree can be removed. If the subtree contains handler
  74    --  entries in zero cost exception mode, then such removal can lead to
  75    --  dangling references to non-existent handlers in the handler table.
  76    --  This procedure removes such references.
  77
  78    --------------------------------------
  79    -- Subprogram_Descriptor Generation --
  80    --------------------------------------
  81
  82    --  Subprogram descriptors are required for all subprograms, including
  83    --  explicit subprograms defined in the program, subprograms that are
  84    --  imported via pragma Import, and also for the implicit elaboration
  85    --  subprograms used to elaborate package specs and bodies.
  86
  87    procedure Generate_Subprogram_Descriptor_For_Package
  88      (N    : Node_Id;
  89       Spec : Entity_Id);
  90    --  This is used to create a descriptor for the implicit elaboration
  91    --  procedure for a package spec of body. The compiler only generates
  92    --  such descriptors if the package spec or body contains exception
  93    --  handlers (either explicitly in the case of a body, or from generic
  94    --  package instantiations). N is the node for the package body or
  95    --  spec, and Spec is the package body or package entity respectively.
  96    --  N must be a compilation unit, and the descriptor is placed at
  97    --  the end of the actions for the auxiliary compilation unit node.
  98
  99    procedure Generate_Subprogram_Descriptor_For_Subprogram
 100      (N    : Node_Id;
 101       Spec : Entity_Id);
 102    --  This is used to create a desriptor for a subprogram, both those
 103    --  present in the source, and those implicitly generated by code
 104    --  expansion. N is the subprogram body node, and Spec is the entity
 105    --  for the subprogram. The descriptor is placed at the end of the
 106    --  Last exception handler, or, if there are no handlers, at the end
 107    --  of the statement sequence.
 108
 109    procedure Generate_Subprogram_Descriptor_For_Imported_Subprogram
 110      (Spec  : Entity_Id;
 111       Slist : List_Id);
 112    --  This is used to create a descriptor for an imported subprogram.
 113    --  Such descriptors are needed for propagation of exceptions through
 114    --  such subprograms. The descriptor never references any handlers,
 115    --  and is appended to the given Slist.
 116
 117 end Exp_Ch11;