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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                               S P R I N T                                --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2012, 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.      --

--                                                                          --

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--  This package (source print) contains routines for printing the source

--  program corresponding to a specified syntax tree. These routines are

--  intended for debugging use in the compiler (not as a user level pretty

--  print tool). Only information present in the tree is output (e.g. no

--  comments are present in the output), and as far as possible we avoid

--  making any assumptions about the correctness of the tree, so a bad

--  tree may either blow up on a debugging check, or list incorrect source.

with Types; use Types;

package Sprint is

   -----------------------

   -- Syntax Extensions --

   -----------------------

   --  When the generated tree is printed, it contains constructs that are not

   --  pure Ada. For convenience, syntactic extensions to Ada have been defined

   --  purely for the purposes of this printout (they are not recognized by the

   --  parser)

   --  Could use more documentation for all of these ???

   --    Allocator                           new xxx [storage_pool = xxx]

   --    Cleanup action                      at end procedure name;

   --    Conditional expression              (if expr then expr else expr)

   --    Conversion wi Float_Truncate        target^(source)

   --    Convert wi Conversion_OK            target?(source)

   --    Convert wi Rounded_Result           target@(source)

   --    Divide wi Treat_Fixed_As_Integer    x #/ y

   --    Divide wi Rounded_Result            x @/ y

   --    Expression with actions             do action; .. action; in expr end

   --    Expression with range check         {expression}

   --    Free statement                      free expr [storage_pool = xxx]

   --    Freeze entity with freeze actions   freeze entityname [ actions ]

   --    Implicit call to run time routine   $routine-name

   --    Implicit exportation                $pragma import (...)

   --    Implicit importation                $pragma export (...)

   --    Interpretation                      interpretation type [, entity]

   --    Intrinsic calls                     function-name!(arg, arg, arg)

   --    Itype declaration                   [(sub)type declaration without ;]

   --    Itype reference                     reference itype

   --    Label declaration                   labelname : label

   --    Mod wi Treat_Fixed_As_Integer       x #mod y

   --    Multiple concatenation              expr && expr && expr ... && expr

   --    Multiply wi Treat_Fixed_As_Integer  x #* y

   --    Multiply wi Rounded_Result          x @* y

   --    Operator with range check           {operator} (e.g. {+})

   --    Others choice for cleanup           when all others

   --    Pop exception label                 %pop_xxx_exception_label

   --    Push exception label                %push_xxx_exception_label (label)

   --    Raise xxx error                     [xxx_error [when cond]]

   --    Raise xxx error with msg            [xxx_error [when cond], "msg"]

   --    Rational literal                    [expression]

   --    Rem wi Treat_Fixed_As_Integer       x #rem y

   --    Reference                           expression'reference

   --    Shift nodes                         shift_name!(expr, count)

   --    Static declaration                  name : static xxx

   --    Subprogram_Info                     subprog'Subprogram_Info

   --    Unchecked conversion                target_type!(source_expression)

   --    Unchecked expression                `(expression)

   --    Validate_Unchecked_Conversion       validate unchecked_conversion

   --                                                  (src-type, target-typ);

   --  Note: the storage_pool parameters for allocators and the free node are

   --  omitted if the Storage_Pool field is Empty, indicating use of the

   --  standard default pool.

   -----------------

   -- Subprograms --

   -----------------

   procedure Source_Dump;

   --  This routine is called from the GNAT main program to dump source as

   --  requested by debug options. The relevant debug options are:

   --    -ds  print source from tree, both original and generated code

   --    -dg  print source from tree, including only the generated code

   --    -do  print source from tree, including only the original code

   --    -df  modify the above to include all units, not just the main unit

   --    -sz  print source from tree for package Standard

   procedure Sprint_Comma_List (List : List_Id);

   --  Prints the nodes in a list, with separating commas. If the list is empty

   --  then no output is generated.

   procedure Sprint_Paren_Comma_List (List : List_Id);

   --  Prints the nodes in a list, surrounded by parentheses, and separated by

   --  commas. If the list is empty, then no output is generated. A blank is

   --  output before the initial left parenthesis.

   procedure Sprint_Opt_Paren_Comma_List (List : List_Id);

   --  Same as normal Sprint_Paren_Comma_List procedure, except that an extra

   --  blank is output if List is non-empty, and nothing at all is printed it

   --  the argument is No_List.

   procedure Sprint_Node_List (List : List_Id; New_Lines : Boolean := False);

   --  Prints the nodes in a list with no separating characters. This is used

   --  in the case of lists of items which are printed on separate lines using

   --  the current indentation amount. New_Lines controls the generation of

   --  New_Line calls. If False, no New_Line calls are generated. If True,

   --  then New_Line calls are generated as needed to ensure that each list

   --  item starts at the beginning of a line.

   procedure Sprint_Opt_Node_List (List : List_Id);

   --  Like Sprint_Node_List, but prints nothing if List = No_List

   procedure Sprint_Indented_List (List : List_Id);

   --  Like Sprint_Line_List, except that the indentation level is increased

   --  before outputting the list of items, and then decremented (back to its

   --  original level) before returning to the caller.

   procedure Sprint_Node (Node : Node_Id);

   --  Prints a single node. No new lines are output, except as required for

   --  splitting lines that are too long to fit on a single physical line.

   --  No output is generated at all if Node is Empty. No trailing or leading

   --  blank characters are generated.

   procedure Sprint_Opt_Node (Node : Node_Id);

   --  Same as normal Sprint_Node procedure, except that one leading blank is

   --  output before the node if it is non-empty.

   procedure pg (Arg : Union_Id);

   pragma Export (Ada, pg);

   --  Print generated source for argument N (like -gnatdg output). Intended

   --  only for use from gdb for debugging purposes. Currently, Arg may be a

   --  List_Id or a Node_Id (anything else outputs a blank line).

   procedure po (Arg : Union_Id);

   pragma Export (Ada, po);

   --  Like pg, but prints original source for the argument (like -gnatdo

   --  output). Intended only for use from gdb for debugging purposes. In

   --  the list case, an end of line is output to separate list elements.

   procedure ps (Arg : Union_Id);

   pragma Export (Ada, ps);

   --  Like pg, but prints generated and original source for the argument (like

   --  -gnatds output). Intended only for use from gdb for debugging purposes.

   --  In the list case, an end of line is output to separate list elements.

end Sprint;