gcc/ada/warnsw.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                               W A R N S W                                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1999-2019, 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 3,  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 COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 --  This unit contains the routines used to handle setting of warning options
  27
  28 package Warnsw is
  29
  30    -------------------
  31    -- Warning Flags --
  32    -------------------
  33
  34    --  These flags are activated or deactivated by -gnatw switches and control
  35    --  whether warnings of a given class will be generated or not.
  36
  37    --  Note: most of these flags are still in opt, but the plan is to move them
  38    --  here as time goes by. And in fact a really nice idea would be to put
  39    --  them all in a Warn_Record so that they would be easy to save/restore.
  40
  41    Warn_On_Anonymous_Allocators : Boolean := False;
  42    --  Warn when allocators for anonymous access types are present, which,
  43    --  although not illegal in Ada, may be confusing to users due to how
  44    --  accessibility checks get generated. Off by default, modified by use
  45    --  of -gnatw_a/_A and set as part of -gnatwa.
  46
  47    Warn_On_Late_Primitives : Boolean := False;
  48    --  Warn when tagged type public primitives are defined after its private
  49    --  extensions.
  50
  51    Warn_On_Unknown_Compile_Time_Warning : Boolean := True;
  52    --  Warn on a pragma Compile_Time_Warning or Compile_Time_Error whose
  53    --  condition has a value that is not known at compile time.
  54
  55    Warn_On_Overridden_Size : Boolean := False;
  56    --  Warn when explicit record component clause or array component_size
  57    --  clause specifies a size that overrides a size for the type which was
  58    --  set with an explicit size clause. Off by default, modified by use of
  59    --  -gnatw.s/.S (but not -gnatwa).
  60
  61    Warn_On_Questionable_Layout : Boolean := False;
  62    --  Warn when default layout of a record type is questionable for run-time
  63    --  efficiency reasons and would be improved by reordering the components.
  64    --  Off by default, modified by use of -gnatw.q/.Q (but not -gnatwa).
  65
  66    Warn_On_Record_Holes : Boolean := False;
  67    --  Warn when explicit record component clauses leave uncovered holes (gaps)
  68    --  in a record layout. Off by default, set by -gnatw.h (but not -gnatwa).
  69
  70    Warn_On_Component_Order : Boolean := False;
  71    --  Warn when record component clauses are out of order with respect to the
  72    --  component declarations, or if the memory layout is out of order with
  73    --  respect to component declarations and clauses.  Off by default, set by
  74    --  -gnatw_r (but not -gnatwa).
  75
  76    Warn_On_Size_Alignment : Boolean := True;
  77    --  Warn when explicit Size and Alignment clauses are given for a type, and
  78    --  the size is not a multiple of the alignment. Off by default, modified
  79    --  by use of -gnatw.z/.Z and set as part of -gnatwa.
  80
  81    Warn_On_Standard_Redefinition : Boolean := False;
  82    --  Warn when a program defines an identifier that matches a name in
  83    --  Standard. Off by default, modified by use of -gnatw.k/.K (but not
  84    --  by -gnatwa).
  85
  86    -----------------------------------
  87    -- Saving and Restoring Warnings --
  88    -----------------------------------
  89
  90    --  Type used to save and restore warnings
  91
  92    type Warning_Record is record
  93       Address_Clause_Overlay_Warnings      : Boolean;
  94       Check_Unreferenced                   : Boolean;
  95       Check_Unreferenced_Formals           : Boolean;
  96       Check_Withs                          : Boolean;
  97       Constant_Condition_Warnings          : Boolean;
  98       Elab_Info_Messages                   : Boolean;
  99       Elab_Warnings                        : Boolean;
 100       Implementation_Unit_Warnings         : Boolean;
 101       Ineffective_Inline_Warnings          : Boolean;
 102       List_Body_Required_Info              : Boolean;
 103       List_Inherited_Aspects               : Boolean;
 104       No_Warn_On_Non_Local_Exception       : Boolean;
 105       Warning_Doc_Switch                   : Boolean;
 106       Warn_On_Ada_2005_Compatibility       : Boolean;
 107       Warn_On_Ada_2012_Compatibility       : Boolean;
 108       Warn_On_All_Unread_Out_Parameters    : Boolean;
 109       Warn_On_Anonymous_Allocators         : Boolean;
 110       Warn_On_Assertion_Failure            : Boolean;
 111       Warn_On_Assumed_Low_Bound            : Boolean;
 112       Warn_On_Atomic_Synchronization       : Boolean;
 113       Warn_On_Bad_Fixed_Value              : Boolean;
 114       Warn_On_Biased_Representation        : Boolean;
 115       Warn_On_Constant                     : Boolean;
 116       Warn_On_Deleted_Code                 : Boolean;
 117       Warn_On_Dereference                  : Boolean;
 118       Warn_On_Export_Import                : Boolean;
 119       Warn_On_Hiding                       : Boolean;
 120       Warn_On_Late_Primitives              : Boolean;
 121       Warn_On_Modified_Unread              : Boolean;
 122       Warn_On_No_Value_Assigned            : Boolean;
 123       Warn_On_Non_Local_Exception          : Boolean;
 124       Warn_On_Object_Renames_Function      : Boolean;
 125       Warn_On_Obsolescent_Feature          : Boolean;
 126       Warn_On_Overlap                      : Boolean;
 127       Warn_On_Overridden_Size              : Boolean;
 128       Warn_On_Parameter_Order              : Boolean;
 129       Warn_On_Questionable_Layout          : Boolean;
 130       Warn_On_Questionable_Missing_Parens  : Boolean;
 131       Warn_On_Record_Holes                 : Boolean;
 132       Warn_On_Component_Order              : Boolean;
 133       Warn_On_Redundant_Constructs         : Boolean;
 134       Warn_On_Reverse_Bit_Order            : Boolean;
 135       Warn_On_Size_Alignment               : Boolean;
 136       Warn_On_Standard_Redefinition        : Boolean;
 137       Warn_On_Suspicious_Contract          : Boolean;
 138       Warn_On_Suspicious_Modulus_Value     : Boolean;
 139       Warn_On_Unchecked_Conversion         : Boolean;
 140       Warn_On_Unknown_Compile_Time_Warning : Boolean;
 141       Warn_On_Unordered_Enumeration_Type   : Boolean;
 142       Warn_On_Unrecognized_Pragma          : Boolean;
 143       Warn_On_Unrepped_Components          : Boolean;
 144       Warn_On_Warnings_Off                 : Boolean;
 145    end record;
 146
 147    function Save_Warnings return Warning_Record;
 148    --  Returns current settingh of warnings
 149
 150    procedure Restore_Warnings (W : Warning_Record);
 151    --  Restores current settings of warning flags from W
 152
 153    -----------------
 154    -- Subprograms --
 155    -----------------
 156
 157    function Set_Warning_Switch (C : Character) return Boolean;
 158    --  This function sets the warning switch or switches corresponding to the
 159    --  given character. It is used to process a -gnatw switch on the command
 160    --  line, or a character in a string literal in pragma Warnings. Returns
 161    --  True for valid warning character C, False for invalid character.
 162
 163    function Set_Dot_Warning_Switch (C : Character) return Boolean;
 164    --  This function sets the warning switch or switches corresponding to the
 165    --  given character preceded by a dot. Used to process a -gnatw. switch on
 166    --  the command line or .C in a string literal in pragma Warnings. Returns
 167    --  True for valid warning character C, False for invalid character.
 168
 169    function Set_Underscore_Warning_Switch (C : Character) return Boolean;
 170    --  This function sets the warning switch or switches corresponding to the
 171    --  given character preceded by an underscore. Used to process a -gnatw_
 172    --  switch on the command line or _C in a string literal in pragma Warnings.
 173    --  Returns True for valid warnings character C, False for invalid
 174    --  character.
 175
 176    procedure Set_GNAT_Mode_Warnings;
 177    --  This is called in -gnatg mode to set the warnings for gnat mode. It is
 178    --  also used to set the proper warning statuses for -gnatw.g. Note that
 179    --  this set of warnings is neither a subset nor a superset of -gnatwa, it
 180    --  enables warnings that are not included in -gnatwa and disables warnings
 181    --  that are included in -gnatwa (such as Warn_On_Implementation_Units, that
 182    --  we clearly want to be False for units built with -gnatg).
 183
 184 end Warnsw;