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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                              E R R O U T C                               --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2011, 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.      --

--                                                                          --

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

--  This packages contains global variables and routines common to error

--  reporting packages, including Errout and Prj.Err.

with Table;

with Types; use Types;

package Erroutc is

   Class_Flag : Boolean := False;

   --  This flag is set True when outputting a reference to a class-wide

   --  type, and is used by Add_Class to insert 'Class at the proper point

   Continuation : Boolean := False;

   --  Indicates if current message is a continuation. Initialized from the

   --  Msg_Cont parameter in Error_Msg_Internal and then set True if a \

   --  insertion character is encountered.

   Continuation_New_Line : Boolean := False;

   --  Indicates if current message was a continuation line marked with \\ to

   --  force a new line. Set True if \\ encountered.

   Flag_Source : Source_File_Index;

   --  Source file index for source file where error is being posted

   Is_Warning_Msg : Boolean := False;

   --  Set True to indicate if current message is warning message

   Is_Style_Msg : Boolean := False;

   --  Set True to indicate if the current message is a style message

   --  (i.e. a message whose text starts with the characters "(style)").

   Is_Serious_Error : Boolean := False;

   --  Set by Set_Msg_Text to indicate if current message is serious error

   Is_Unconditional_Msg : Boolean := False;

   --  Set by Set_Msg_Text to indicate if current message is unconditional

   Kill_Message : Boolean := False;

   --  A flag used to kill weird messages (e.g. those containing uninterpreted

   --  implicit type references) if we have already seen at least one message

   --  already. The idea is that we hope the weird message is a junk cascaded

   --  message that should be suppressed.

   Last_Killed : Boolean := False;

   --  Set True if the most recently posted non-continuation message was

   --  killed. This is used to determine the processing of any continuation

   --  messages that follow.

   List_Pragmas_Index : Int := 0;

   --  Index into List_Pragmas table

   List_Pragmas_Mode : Boolean := False;

   --  Starts True, gets set False by pragma List (Off), True by List (On)

   Manual_Quote_Mode : Boolean := False;

   --  Set True in manual quotation mode

   Max_Msg_Length : constant := 1024 + 2 * Int (Column_Number'Last);

   --  Maximum length of error message. The addition of 2 * Column_Number'Last

   --  ensures that two insertion tokens of maximum length can be accommodated.

   --  The value of 1024 is an arbitrary value that should be more than long

   --  enough to accommodate any reasonable message (and for that matter, some

   --  pretty unreasonable messages!)

   Msg_Buffer : String (1 .. Max_Msg_Length);

   --  Buffer used to prepare error messages

   Msglen : Integer := 0;

   --  Number of characters currently stored in the message buffer

   Suppress_Message : Boolean;

   --  A flag used to suppress certain obviously redundant messages (i.e.

   --  those referring to a node whose type is Any_Type). This suppression

   --  is effective only if All_Errors_Mode is off.

   Suppress_Instance_Location : Boolean := False;

   --  Normally, if a # location in a message references a location within

   --  a generic template, then a note is added giving the location of the

   --  instantiation. If this variable is set True, then this note is not

   --  output. This is used for internal processing for the case of an

   --  illegal instantiation. See Error_Msg routine for further details.

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

   -- Message ID Definitions --

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

   type Error_Msg_Id is new Int;

   --  A type used to represent specific error messages. Used by the clients

   --  of this package only in the context of the Get_Error_Id and

   --  Change_Error_Text subprograms.

   No_Error_Msg : constant Error_Msg_Id := 0;

   --  A constant which is different from any value returned by Get_Error_Id.

   --  Typically used by a client to indicate absence of a saved Id value.

   Cur_Msg : Error_Msg_Id := No_Error_Msg;

   --  Id of most recently posted error message

   function Get_Msg_Id return Error_Msg_Id;

   --  Returns the Id of the message most recently posted using one of the

   --  Error_Msg routines.

   function Get_Location (E : Error_Msg_Id) return Source_Ptr;

   --  Returns the flag location of the error message with the given id E

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

   -- Error Message Data Structures --

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

   --  The error messages are stored as a linked list of error message objects

   --  sorted into ascending order by the source location (Sloc). Each object

   --  records the text of the message and its source location.

   --  The following record type and table are used to represent error

   --  messages, with one entry in the table being allocated for each message.

   type Error_Msg_Object is record

      Text : String_Ptr;

      --  Text of error message, fully expanded with all insertions

      Next : Error_Msg_Id;

      --  Pointer to next message in error chain. A value of No_Error_Msg

      --  indicates the end of the chain.

      Prev : Error_Msg_Id;

      --  Pointer to previous message in error chain. Only set during the

      --  Finalize procedure. A value of No_Error_Msg indicates the first

      --  message in the chain.

      Sfile : Source_File_Index;

      --  Source table index of source file. In the case of an error that

      --  refers to a template, always references the original template

      --  not an instantiation copy.

      Sptr : Source_Ptr;

      --  Flag pointer. In the case of an error that refers to a template,

      --  always references the original template, not an instantiation copy.

      --  This value is the actual place in the source that the error message

      --  will be posted. Note that an error placed on an instantiation will

      --  have Sptr pointing to the instantiation point.

      Optr : Source_Ptr;

      --  Flag location used in the call to post the error. This is normally

      --  the same as Sptr, except when an error is posted on a particular

      --  instantiation of a generic. In such a case, Sptr will point to

      --  the original source location of the instantiation itself, but

      --  Optr will point to the template location (more accurately to the

      --  template copy in the instantiation copy corresponding to the

      --  instantiation referenced by Sptr).

      Line : Physical_Line_Number;

      --  Line number for error message

      Col : Column_Number;

      --  Column number for error message

      Warn : Boolean;

      --  True if warning message (i.e. insertion character ? appeared)

      Style : Boolean;

      --  True if style message (starts with "(style)")

      Serious : Boolean;

      --  True if serious error message (not a warning and no | character)

      Uncond : Boolean;

      --  True if unconditional message (i.e. insertion character ! appeared)

      Msg_Cont : Boolean;

      --  This is used for logical messages that are composed of multiple

      --  individual messages. For messages that are not part of such a

      --  group, or that are the first message in such a group. Msg_Cont

      --  is set to False. For subsequent messages in a group, Msg_Cont

      --  is set to True. This is used to make sure that such a group of

      --  messages is either suppressed or retained as a group (e.g. in

      --  the circuit that deletes identical messages).

      Deleted : Boolean;

      --  If this flag is set, the message is not printed. This is used

      --  in the circuit for deleting duplicate/redundant error messages.

   end record;

   package Errors is new Table.Table (

     Table_Component_Type => Error_Msg_Object,

     Table_Index_Type     => Error_Msg_Id,

     Table_Low_Bound      => 1,

     Table_Initial        => 200,

     Table_Increment      => 200,

     Table_Name           => "Error");

   First_Error_Msg : Error_Msg_Id;

   --  The list of error messages, i.e. the first entry on the list of error

   --  messages. This is not the same as the physically first entry in the

   --  error message table, since messages are not always inserted in sequence.

   Last_Error_Msg : Error_Msg_Id;

   --  The last entry on the list of error messages. Note: this is not the same

   --  as the physically last entry in the error message table, since messages

   --  are not always inserted in sequence.

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

   -- Warning Mode Control --

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

   --  Pragma Warnings allows warnings to be turned off for a specified region

   --  of code, and the following tables are the data structures used to keep

   --  track of these regions.

   --  The first table is used for the basic command line control, and for the

   --  forms of Warning with a single ON or OFF parameter.

   --  It contains pairs of source locations, the first being the start

   --  location for a warnings off region, and the second being the end

   --  location. When a pragma Warnings (Off) is encountered, a new entry is

   --  established extending from the location of the pragma to the end of the

   --  current source file. A subsequent pragma Warnings (On) adjusts the end

   --  point of this entry appropriately.

   --  If all warnings are suppressed by command switch, then there is a dummy

   --  entry (put there by Errout.Initialize) at the start of the table which

   --  covers all possible Source_Ptr values. Note that the source pointer

   --  values in this table always reference the original template, not an

   --  instantiation copy, in the generic case.

   type Warnings_Entry is record

      Start : Source_Ptr;

      Stop  : Source_Ptr;

   end record;

   package Warnings is new Table.Table (

     Table_Component_Type => Warnings_Entry,

     Table_Index_Type     => Natural,

     Table_Low_Bound      => 1,

     Table_Initial        => 100,

     Table_Increment      => 200,

     Table_Name           => "Warnings");

   --  The second table is used for the specific forms of the pragma, where

   --  the first argument is ON or OFF, and the second parameter is a string

   --  which is the entire message to suppress, or a prefix of it.

   type Specific_Warning_Entry is record

      Start : Source_Ptr;

      Stop  : Source_Ptr;

      --  Starting and ending source pointers for the range. These are always

      --  from the same source file.

      Msg : String_Ptr;

      --  Message from pragma Warnings (Off, string)

      Open : Boolean;

      --  Set to True if OFF has been encountered with no matching ON

      Used : Boolean;

      --  Set to True if entry has been used to suppress a warning

      Config : Boolean;

      --  True if pragma is configuration pragma (in which case no matching Off

      --  pragma is required, and it is not required that a specific warning be

      --  suppressed).

   end record;

   package Specific_Warnings is new Table.Table (

     Table_Component_Type => Specific_Warning_Entry,

     Table_Index_Type     => Natural,

     Table_Low_Bound      => 1,

     Table_Initial        => 100,

     Table_Increment      => 200,

     Table_Name           => "Specific_Warnings");

   --  Note on handling configuration case versus specific case. A complication

   --  arises from this example:

   --     pragma Warnings (Off, "not referenced*");

   --     procedure Mumble (X : Integer) is

   --     pragma Warnings (On, "not referenced*");

   --     begin

   --        null;

   --     end Mumble;

   --  The trouble is that the first pragma is technically a configuration

   --  pragma, and yet it is clearly being used in the context of thinking of

   --  it as a specific case. To deal with this, what we do is that the On

   --  entry can match a configuration pragma from the same file, and if we

   --  find such an On entry, we cancel the indication of it being the

   --  configuration case. This seems to handle all cases we run into ok.

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

   -- Subprograms --

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

   procedure Add_Class;

   --  Add 'Class to buffer for class wide type case (Class_Flag set)

   function Buffer_Ends_With (S : String) return Boolean;

   --  Tests if message buffer ends with given string preceded by a space

   procedure Buffer_Remove (S : String);

   --  Removes given string from end of buffer if it is present

   --  at end of buffer, and preceded by a space.

   function Compilation_Errors return Boolean;

   --  Returns true if errors have been detected, or warnings in -gnatwe

   --  (treat warnings as errors) mode.

   procedure dmsg (Id : Error_Msg_Id);

   --  Debugging routine to dump an error message

   procedure Debug_Output (N : Node_Id);

   --  Called from Error_Msg_N and Error_Msg_NE to generate line of debug

   --  output giving node number (of node N) if the debug X switch is set.

   procedure Check_Duplicate_Message (M1, M2 : Error_Msg_Id);

   --  This function is passed the Id values of two error messages. If either

   --  M1 or M2 is a continuation message, or is already deleted, the call is

   --  ignored. Otherwise a check is made to see if M1 and M2 are duplicated or

   --  redundant. If so, the message to be deleted and all its continuations

   --  are marked with the Deleted flag set to True.

   procedure Output_Error_Msgs (E : in out Error_Msg_Id);

   --  Output source line, error flag, and text of stored error message and all

   --  subsequent messages for the same line and unit. On return E is set to be

   --  one higher than the last message output.

   procedure Output_Line_Number (L : Logical_Line_Number);

   --  Output a line number as six digits (with leading zeroes suppressed),

   --  followed by a period and a blank (note that this is 8 characters which

   --  means that tabs in the source line will not get messed up). Line numbers

   --  that match or are less than the last Source_Reference pragma are listed

   --  as all blanks, avoiding output of junk line numbers.

   procedure Output_Msg_Text (E : Error_Msg_Id);

   --  Outputs characters of text in the text of the error message E. Note that

   --  no end of line is output, the caller is responsible for adding the end

   --  of line. If Error_Msg_Line_Length is non-zero, this is the routine that

   --  splits the line generating multiple lines of output, and in this case

   --  the last line has no terminating end of line character.

   procedure Purge_Messages (From : Source_Ptr; To : Source_Ptr);

   --  All error messages whose location is in the range From .. To (not

   --  including the end points) will be deleted from the error listing.

   function Same_Error (M1, M2 : Error_Msg_Id) return Boolean;

   --  See if two messages have the same text. Returns true if the text of the

   --  two messages is identical, or if one of them is the same as the other

   --  with an appended "instance at xxx" tag.

   procedure Set_Msg_Blank;

   --  Sets a single blank in the message if the preceding character is a

   --  non-blank character other than a left parenthesis or minus. Has no

   --  effect if manual quote mode is turned on.

   procedure Set_Msg_Blank_Conditional;

   --  Sets a single blank in the message if the preceding character is a

   --  non-blank character other than a left parenthesis or quote. Has no

   --  effect if manual quote mode is turned on.

   procedure Set_Msg_Char (C : Character);

   --  Add a single character to the current message. This routine does not

   --  check for special insertion characters (they are just treated as text

   --  characters if they occur).

   procedure Set_Msg_Insertion_File_Name;

   --  Handle file name insertion (left brace insertion character)

   procedure Set_Msg_Insertion_Line_Number (Loc, Flag : Source_Ptr);

   --  Handle line number insertion (# insertion character). Loc is the

   --  location to be referenced, and Flag is the location at which the

   --  flag is posted (used to determine whether to add "in file xxx")

   procedure Set_Msg_Insertion_Name_Literal;

   procedure Set_Msg_Insertion_Name;

   --  Handle name insertion (% insertion character)

   procedure Set_Msg_Insertion_Reserved_Name;

   --  Handle insertion of reserved word name (* insertion character)

   procedure Set_Msg_Insertion_Reserved_Word

     (Text : String;

      J    : in out Integer);

   --  Handle reserved word insertion (upper case letters). The Text argument

   --  is the current error message input text, and J is an index which on

   --  entry points to the first character of the reserved word, and on exit

   --  points past the last character of the reserved word.

   procedure Set_Msg_Insertion_Run_Time_Name;

   --  If package System contains a definition for Run_Time_Name (see package

   --  Targparm for details), then this procedure will insert a message of

   --  the form (name) into the current error message, with name set in mixed

   --  case (upper case after any spaces). If no run time name is defined,

   --  then this routine has no effect).

   procedure Set_Msg_Insertion_Uint;

   --  Handle Uint insertion (^ insertion character)

   procedure Set_Msg_Int (Line : Int);

   --  Set the decimal representation of the argument in the error message

   --  buffer with no leading zeroes output.

   procedure Set_Msg_Name_Buffer;

   --  Output name from Name_Buffer, with surrounding quotes unless manual

   --  quotation mode is in effect.

   procedure Set_Msg_Quote;

   --  Set quote if in normal quote mode, nothing if in manual quote mode

   procedure Set_Msg_Str (Text : String);

   --  Add a sequence of characters to the current message. This routine does

   --  not check for special insertion characters (they are just treated as

   --  text characters if they occur).

   procedure Set_Next_Non_Deleted_Msg (E : in out Error_Msg_Id);

   --  Given a message id, move to next message id, but skip any deleted

   --  messages, so that this results in E on output being the first non-

   --  deleted message following the input value of E, or No_Error_Msg if

   --  the input value of E was either already No_Error_Msg, or was the

   --  last non-deleted message.

   procedure Set_Specific_Warning_Off

     (Loc    : Source_Ptr;

      Msg    : String;

      Config : Boolean;

      Used   : Boolean := False);

   --  This is called in response to the two argument form of pragma Warnings

   --  where the first argument is OFF, and the second argument is a string

   --  which identifies a specific warning to be suppressed. The first argument

   --  is the start of the suppression range, and the second argument is the

   --  string from the pragma. Loc is the location of the pragma (which is the

   --  start of the range to suppress). Config is True for the configuration

   --  pragma case (where there is no requirement for a matching OFF pragma).

   --  Used is set True to disable the check that the warning actually has

   --  has the effect of suppressing a warning.

   procedure Set_Specific_Warning_On

     (Loc : Source_Ptr;

      Msg : String;

      Err : out Boolean);

   --  This is called in response to the two argument form of pragma Warnings

   --  where the first argument is ON, and the second argument is a string

   --  which identifies a specific warning to be suppressed. The first argument

   --  is the end of the suppression range, and the second argument is the

   --  string from the pragma. Err is set to True on return to report the error

   --  of no matching Warnings Off pragma preceding this one.

   procedure Set_Warnings_Mode_Off (Loc : Source_Ptr);

   --  Called in response to a pragma Warnings (Off) to record the source

   --  location from which warnings are to be turned off.

   procedure Set_Warnings_Mode_On (Loc : Source_Ptr);

   --  Called in response to a pragma Warnings (On) to record the source

   --  location from which warnings are to be turned back on.

   procedure Test_Style_Warning_Serious_Msg (Msg : String);

   --  Sets Is_Warning_Msg true if Msg is a warning message (contains a

   --  question mark character), and False otherwise. Is_Style_Msg is set true

   --  if Msg is a style message (starts with "(style)". Sets Is_Serious_Error

   --  True unless the message is a warning or style/info message or contains

   --  the character | indicating a non-serious error message. Note that the

   --  call has no effect for continuation messages (those whose first

   --  character is '\').

   function Warnings_Suppressed (Loc : Source_Ptr) return Boolean;

   --  Determines if given location is covered by a warnings off suppression

   --  range in the warnings table (or is suppressed by compilation option,

   --  which generates a warning range for the whole source file). This routine

   --  only deals with the general ON/OFF case, not specific warnings. True

   --  is also returned if warnings are globally suppressed.

   function Warning_Specifically_Suppressed

     (Loc : Source_Ptr;

      Msg : String_Ptr) return Boolean;

   --  Determines if given message to be posted at given location is suppressed

   --  by specific ON/OFF Warnings pragmas specifying this particular message.

   type Error_Msg_Proc is

     access procedure (Msg : String; Flag_Location : Source_Ptr);

   procedure Validate_Specific_Warnings (Eproc : Error_Msg_Proc);

   --  Checks that specific warnings are consistent (for non-configuration

   --  case, properly closed, and used). The argument is a pointer to the

   --  Error_Msg procedure to be called if any inconsistencies are detected.

end Erroutc;