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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;
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