| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- P R E P -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2002-2005, 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 2, 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 COPYING. If not, write -- |
| -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- |
| -- Boston, MA 02110-1301, USA. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with Csets; use Csets; |
| with Err_Vars; use Err_Vars; |
| with Namet; use Namet; |
| with Opt; use Opt; |
| with Osint; use Osint; |
| with Output; use Output; |
| with Scans; use Scans; |
| with Snames; use Snames; |
| with Sinput; |
| with Stringt; use Stringt; |
| with Table; |
| |
| with GNAT.Heap_Sort_G; |
| |
| package body Prep is |
| |
| use Symbol_Table; |
| |
| type Token_Name_Array is array (Token_Type) of Name_Id; |
| Token_Names : constant Token_Name_Array := |
| (Tok_Abort => Name_Abort, |
| Tok_Abs => Name_Abs, |
| Tok_Abstract => Name_Abstract, |
| Tok_Accept => Name_Accept, |
| Tok_Aliased => Name_Aliased, |
| Tok_All => Name_All, |
| Tok_Array => Name_Array, |
| Tok_And => Name_And, |
| Tok_At => Name_At, |
| Tok_Begin => Name_Begin, |
| Tok_Body => Name_Body, |
| Tok_Case => Name_Case, |
| Tok_Constant => Name_Constant, |
| Tok_Declare => Name_Declare, |
| Tok_Delay => Name_Delay, |
| Tok_Delta => Name_Delta, |
| Tok_Digits => Name_Digits, |
| Tok_Else => Name_Else, |
| Tok_Elsif => Name_Elsif, |
| Tok_End => Name_End, |
| Tok_Entry => Name_Entry, |
| Tok_Exception => Name_Exception, |
| Tok_Exit => Name_Exit, |
| Tok_For => Name_For, |
| Tok_Function => Name_Function, |
| Tok_Generic => Name_Generic, |
| Tok_Goto => Name_Goto, |
| Tok_If => Name_If, |
| Tok_Is => Name_Is, |
| Tok_Limited => Name_Limited, |
| Tok_Loop => Name_Loop, |
| Tok_Mod => Name_Mod, |
| Tok_New => Name_New, |
| Tok_Null => Name_Null, |
| Tok_Of => Name_Of, |
| Tok_Or => Name_Or, |
| Tok_Others => Name_Others, |
| Tok_Out => Name_Out, |
| Tok_Package => Name_Package, |
| Tok_Pragma => Name_Pragma, |
| Tok_Private => Name_Private, |
| Tok_Procedure => Name_Procedure, |
| Tok_Protected => Name_Protected, |
| Tok_Raise => Name_Raise, |
| Tok_Range => Name_Range, |
| Tok_Record => Name_Record, |
| Tok_Rem => Name_Rem, |
| Tok_Renames => Name_Renames, |
| Tok_Requeue => Name_Requeue, |
| Tok_Return => Name_Return, |
| Tok_Reverse => Name_Reverse, |
| Tok_Select => Name_Select, |
| Tok_Separate => Name_Separate, |
| Tok_Subtype => Name_Subtype, |
| Tok_Tagged => Name_Tagged, |
| Tok_Task => Name_Task, |
| Tok_Terminate => Name_Terminate, |
| Tok_Then => Name_Then, |
| Tok_Type => Name_Type, |
| Tok_Until => Name_Until, |
| Tok_Use => Name_Use, |
| Tok_When => Name_When, |
| Tok_While => Name_While, |
| Tok_With => Name_With, |
| Tok_Xor => Name_Xor, |
| others => No_Name); |
| |
| Already_Initialized : Boolean := False; |
| -- Used to avoid repetition of the part of the initialisation that needs |
| -- to be done only once. |
| |
| Empty_String : String_Id; |
| -- "", as a string_id |
| |
| String_False : String_Id; |
| -- "false", as a string_id |
| |
| Name_Defined : Name_Id; |
| -- defined, as a name_id |
| |
| --------------- |
| -- Behaviour -- |
| --------------- |
| |
| -- Accesses to procedure specified by procedure Initialize |
| |
| Error_Msg : Error_Msg_Proc; |
| -- Report an error |
| |
| Scan : Scan_Proc; |
| -- Scan one token |
| |
| Set_Ignore_Errors : Set_Ignore_Errors_Proc; |
| -- Indicate if error should be taken into account |
| |
| Put_Char : Put_Char_Proc; |
| -- Output one character |
| |
| New_EOL : New_EOL_Proc; |
| -- Output an end of line indication |
| |
| ------------------------------- |
| -- State of the Preprocessor -- |
| ------------------------------- |
| |
| type Pp_State is record |
| If_Ptr : Source_Ptr; |
| -- The location of the #if statement. |
| -- Used to flag #if with no corresponding #end if, at the end. |
| |
| Else_Ptr : Source_Ptr; |
| -- The location of the #else statement. |
| -- Used to detect multiple #else. |
| |
| Deleting : Boolean; |
| -- Set to True when the code should be deleted or commented out |
| |
| Match_Seen : Boolean; |
| -- Set to True when a condition in an #if or an #elsif is True. |
| -- Also set to True if Deleting at the previous level is True. |
| -- Used to decide if Deleting should be set to True in a following |
| -- #elsif or #else. |
| |
| end record; |
| |
| type Pp_Depth is new Nat; |
| |
| Ground : constant Pp_Depth := 0; |
| |
| package Pp_States is new Table.Table |
| (Table_Component_Type => Pp_State, |
| Table_Index_Type => Pp_Depth, |
| Table_Low_Bound => 1, |
| Table_Initial => 10, |
| Table_Increment => 10, |
| Table_Name => "Prep.Pp_States"); |
| -- A stack of the states of the preprocessor, for nested #if |
| |
| type Operator is (None, Op_Or, Op_And); |
| |
| ----------------- |
| -- Subprograms -- |
| ----------------- |
| |
| function Deleting return Boolean; |
| -- Return True if code should be deleted or commented out |
| |
| function Expression (Evaluate_It : Boolean) return Boolean; |
| -- Evaluate a condition in an #if or an #elsif statement. |
| -- If Evaluate_It is False, the condition is effectively evaluated, |
| -- otherwise, only the syntax is checked. |
| |
| procedure Go_To_End_Of_Line; |
| -- Advance the scan pointer until we reach an end of line or the end |
| -- of the buffer. |
| |
| function Matching_Strings (S1, S2 : String_Id) return Boolean; |
| -- Returns True if the two string parameters are equal (case insensitive) |
| |
| --------------------------------------- |
| -- Change_Reserved_Keyword_To_Symbol -- |
| --------------------------------------- |
| |
| procedure Change_Reserved_Keyword_To_Symbol |
| (All_Keywords : Boolean := False) |
| is |
| New_Name : constant Name_Id := Token_Names (Token); |
| |
| begin |
| if New_Name /= No_Name then |
| case Token is |
| when Tok_If | Tok_Else | Tok_Elsif | Tok_End | |
| Tok_And | Tok_Or | Tok_Then => |
| if All_Keywords then |
| Token := Tok_Identifier; |
| Token_Name := New_Name; |
| end if; |
| |
| when others => |
| Token := Tok_Identifier; |
| Token_Name := New_Name; |
| end case; |
| end if; |
| end Change_Reserved_Keyword_To_Symbol; |
| |
| ------------------------------------------ |
| -- Check_Command_Line_Symbol_Definition -- |
| ------------------------------------------ |
| |
| procedure Check_Command_Line_Symbol_Definition |
| (Definition : String; |
| Data : out Symbol_Data) |
| is |
| Index : Natural := 0; |
| Result : Symbol_Data; |
| |
| begin |
| -- Look for the character '=' |
| |
| for J in Definition'Range loop |
| if Definition (J) = '=' then |
| Index := J; |
| exit; |
| end if; |
| end loop; |
| |
| -- If no character '=', then the value is True |
| |
| if Index = 0 then |
| -- Put the symbol in the name buffer |
| |
| Name_Len := Definition'Length; |
| Name_Buffer (1 .. Name_Len) := Definition; |
| Result := True_Value; |
| |
| elsif Index = Definition'First then |
| Fail ("invalid symbol definition """, Definition, """"); |
| |
| else |
| -- Put the symbol in the name buffer |
| |
| Name_Len := Index - Definition'First; |
| Name_Buffer (1 .. Name_Len) := |
| String'(Definition (Definition'First .. Index - 1)); |
| |
| -- Check the syntax of the value |
| |
| if Definition (Index + 1) /= '"' |
| or else Definition (Definition'Last) /= '"' |
| then |
| for J in Index + 1 .. Definition'Last loop |
| case Definition (J) is |
| when '_' | '.' | '0' .. '9' | 'a' .. 'z' | 'A' .. 'Z' => |
| null; |
| |
| when others => |
| Fail ("illegal value """, |
| Definition (Index + 1 .. Definition'Last), |
| """"); |
| end case; |
| end loop; |
| end if; |
| |
| -- And put the value in the result |
| |
| Result.Is_A_String := False; |
| Start_String; |
| Store_String_Chars (Definition (Index + 1 .. Definition'Last)); |
| Result.Value := End_String; |
| end if; |
| |
| -- Now, check the syntax of the symbol (we don't allow accented and |
| -- wide characters) |
| |
| if Name_Buffer (1) not in 'a' .. 'z' |
| and then Name_Buffer (1) not in 'A' .. 'Z' |
| then |
| Fail ("symbol """, |
| Name_Buffer (1 .. Name_Len), |
| """ does not start with a letter"); |
| end if; |
| |
| for J in 2 .. Name_Len loop |
| case Name_Buffer (J) is |
| when 'a' .. 'z' | 'A' .. 'Z' | '0' .. '9' => |
| null; |
| |
| when '_' => |
| if J = Name_Len then |
| Fail ("symbol """, |
| Name_Buffer (1 .. Name_Len), |
| """ end with a '_'"); |
| |
| elsif Name_Buffer (J + 1) = '_' then |
| Fail ("symbol """, |
| Name_Buffer (1 .. Name_Len), |
| """ contains consecutive '_'"); |
| end if; |
| |
| when others => |
| Fail ("symbol """, |
| Name_Buffer (1 .. Name_Len), |
| """ contains illegal character(s)"); |
| end case; |
| end loop; |
| |
| Result.On_The_Command_Line := True; |
| |
| -- Put the symbol name in the result |
| |
| declare |
| Sym : constant String := Name_Buffer (1 .. Name_Len); |
| |
| begin |
| for Index in 1 .. Name_Len loop |
| Name_Buffer (Index) := Fold_Lower (Name_Buffer (Index)); |
| end loop; |
| |
| Result.Symbol := Name_Find; |
| Name_Len := Sym'Length; |
| Name_Buffer (1 .. Name_Len) := Sym; |
| Result.Original := Name_Find; |
| end; |
| |
| Data := Result; |
| end Check_Command_Line_Symbol_Definition; |
| |
| -------------- |
| -- Deleting -- |
| -------------- |
| |
| function Deleting return Boolean is |
| begin |
| -- Always return False when not inside an #if statement |
| |
| if Pp_States.Last = Ground then |
| return False; |
| |
| else |
| return Pp_States.Table (Pp_States.Last).Deleting; |
| end if; |
| end Deleting; |
| |
| ---------------- |
| -- Expression -- |
| ---------------- |
| |
| function Expression (Evaluate_It : Boolean) return Boolean is |
| Evaluation : Boolean := Evaluate_It; |
| -- Is set to False after an "or else" when left term is True and |
| -- after an "and then" when left term is False. |
| |
| Final_Result : Boolean := False; |
| |
| Current_Result : Boolean := False; |
| -- Value of a term |
| |
| Current_Operator : Operator := None; |
| Symbol1 : Symbol_Id; |
| Symbol2 : Symbol_Id; |
| Symbol_Name1 : Name_Id; |
| Symbol_Name2 : Name_Id; |
| Symbol_Pos1 : Source_Ptr; |
| Symbol_Pos2 : Source_Ptr; |
| Symbol_Value1 : String_Id; |
| Symbol_Value2 : String_Id; |
| |
| begin |
| -- Loop for each term |
| |
| loop |
| Change_Reserved_Keyword_To_Symbol; |
| |
| Current_Result := False; |
| |
| case Token is |
| |
| when Tok_Left_Paren => |
| |
| -- ( expression ) |
| |
| Scan.all; |
| Current_Result := Expression (Evaluation); |
| |
| if Token = Tok_Right_Paren then |
| Scan.all; |
| |
| else |
| Error_Msg ("`)` expected", Token_Ptr); |
| end if; |
| |
| when Tok_Not => |
| |
| -- not expression |
| |
| Scan.all; |
| Current_Result := not Expression (Evaluation); |
| |
| when Tok_Identifier => |
| Symbol_Name1 := Token_Name; |
| Symbol_Pos1 := Token_Ptr; |
| Scan.all; |
| |
| if Token = Tok_Apostrophe then |
| |
| -- symbol'Defined |
| |
| Scan.all; |
| |
| if Token = Tok_Identifier |
| and then Token_Name = Name_Defined |
| then |
| Scan.all; |
| |
| else |
| Error_Msg ("identifier `Defined` expected", Token_Ptr); |
| end if; |
| |
| if Evaluation then |
| Current_Result := Index_Of (Symbol_Name1) /= No_Symbol; |
| end if; |
| |
| elsif Token = Tok_Equal then |
| Scan.all; |
| |
| Change_Reserved_Keyword_To_Symbol; |
| |
| if Token = Tok_Identifier then |
| |
| -- symbol = symbol |
| |
| Symbol_Name2 := Token_Name; |
| Symbol_Pos2 := Token_Ptr; |
| Scan.all; |
| |
| if Evaluation then |
| Symbol1 := Index_Of (Symbol_Name1); |
| |
| if Symbol1 = No_Symbol then |
| if Undefined_Symbols_Are_False then |
| Symbol_Value1 := String_False; |
| |
| else |
| Error_Msg_Name_1 := Symbol_Name1; |
| Error_Msg ("unknown symbol %", Symbol_Pos1); |
| Symbol_Value1 := No_String; |
| end if; |
| |
| else |
| Symbol_Value1 := |
| Mapping.Table (Symbol1).Value; |
| end if; |
| |
| Symbol2 := Index_Of (Symbol_Name2); |
| |
| if Symbol2 = No_Symbol then |
| if Undefined_Symbols_Are_False then |
| Symbol_Value2 := String_False; |
| |
| else |
| Error_Msg_Name_1 := Symbol_Name2; |
| Error_Msg ("unknown symbol %", Symbol_Pos2); |
| Symbol_Value2 := No_String; |
| end if; |
| |
| else |
| Symbol_Value2 := Mapping.Table (Symbol2).Value; |
| end if; |
| |
| if Symbol_Value1 /= No_String |
| and then Symbol_Value2 /= No_String |
| then |
| Current_Result := Matching_Strings |
| (Symbol_Value1, Symbol_Value2); |
| end if; |
| end if; |
| |
| elsif Token = Tok_String_Literal then |
| |
| -- symbol = "value" |
| |
| if Evaluation then |
| Symbol1 := Index_Of (Symbol_Name1); |
| |
| if Symbol1 = No_Symbol then |
| if Undefined_Symbols_Are_False then |
| Symbol_Value1 := String_False; |
| |
| else |
| Error_Msg_Name_1 := Symbol_Name1; |
| Error_Msg ("unknown symbol %", Symbol_Pos1); |
| Symbol_Value1 := No_String; |
| end if; |
| |
| else |
| Symbol_Value1 := Mapping.Table (Symbol1).Value; |
| end if; |
| |
| if Symbol_Value1 /= No_String then |
| Current_Result := |
| Matching_Strings |
| (Symbol_Value1, |
| String_Literal_Id); |
| end if; |
| end if; |
| |
| Scan.all; |
| |
| else |
| Error_Msg |
| ("symbol or literal string expected", Token_Ptr); |
| end if; |
| |
| else |
| -- symbol (True or False) |
| |
| if Evaluation then |
| Symbol1 := Index_Of (Symbol_Name1); |
| |
| if Symbol1 = No_Symbol then |
| if Undefined_Symbols_Are_False then |
| Symbol_Value1 := String_False; |
| |
| else |
| Error_Msg_Name_1 := Symbol_Name1; |
| Error_Msg ("unknown symbol %", Symbol_Pos1); |
| Symbol_Value1 := No_String; |
| end if; |
| |
| else |
| Symbol_Value1 := Mapping.Table (Symbol1).Value; |
| end if; |
| |
| if Symbol_Value1 /= No_String then |
| String_To_Name_Buffer (Symbol_Value1); |
| |
| for Index in 1 .. Name_Len loop |
| Name_Buffer (Index) := |
| Fold_Lower (Name_Buffer (Index)); |
| end loop; |
| |
| if Name_Buffer (1 .. Name_Len) = "true" then |
| Current_Result := True; |
| |
| elsif Name_Buffer (1 .. Name_Len) = "false" then |
| Current_Result := False; |
| |
| else |
| Error_Msg_Name_1 := Symbol_Name1; |
| Error_Msg |
| ("value of symbol % is not True or False", |
| Symbol_Pos1); |
| end if; |
| end if; |
| end if; |
| end if; |
| |
| when others => |
| Error_Msg ("`(`, NOT or symbol expected", Token_Ptr); |
| end case; |
| |
| -- Update the cumulative final result |
| |
| case Current_Operator is |
| when None => |
| Final_Result := Current_Result; |
| |
| when Op_Or => |
| Final_Result := Final_Result or Current_Result; |
| |
| when Op_And => |
| Final_Result := Final_Result and Current_Result; |
| end case; |
| |
| -- Check the next operator |
| |
| if Token = Tok_And then |
| if Current_Operator = Op_Or then |
| Error_Msg ("mixing OR and AND is not allowed", Token_Ptr); |
| end if; |
| |
| Current_Operator := Op_And; |
| Scan.all; |
| |
| if Token = Tok_Then then |
| Scan.all; |
| |
| if Final_Result = False then |
| Evaluation := False; |
| end if; |
| end if; |
| |
| elsif Token = Tok_Or then |
| if Current_Operator = Op_And then |
| Error_Msg ("mixing AND and OR is not allowed", Token_Ptr); |
| end if; |
| |
| Current_Operator := Op_Or; |
| Scan.all; |
| |
| if Token = Tok_Else then |
| Scan.all; |
| |
| if Final_Result then |
| Evaluation := False; |
| end if; |
| end if; |
| |
| else |
| -- No operator: exit the term loop |
| |
| exit; |
| end if; |
| end loop; |
| |
| return Final_Result; |
| end Expression; |
| |
| ----------------------- |
| -- Go_To_End_Of_Line -- |
| ----------------------- |
| |
| procedure Go_To_End_Of_Line is |
| begin |
| -- Scan until we get an end of line or we reach the end of the buffer |
| |
| while Token /= Tok_End_Of_Line |
| and then Token /= Tok_EOF |
| loop |
| Scan.all; |
| end loop; |
| end Go_To_End_Of_Line; |
| |
| -------------- |
| -- Index_Of -- |
| -------------- |
| |
| function Index_Of (Symbol : Name_Id) return Symbol_Id is |
| begin |
| if Mapping.Table /= null then |
| for J in Symbol_Id range 1 .. Symbol_Table.Last (Mapping) loop |
| if Mapping.Table (J).Symbol = Symbol then |
| return J; |
| end if; |
| end loop; |
| end if; |
| |
| return No_Symbol; |
| end Index_Of; |
| |
| ---------------- |
| -- Preprocess -- |
| ---------------- |
| |
| procedure Preprocess is |
| Start_Of_Processing : Source_Ptr; |
| Cond : Boolean; |
| Preprocessor_Line : Boolean := False; |
| |
| procedure Output (From, To : Source_Ptr); |
| -- Output the characters with indices From .. To in the buffer |
| -- to the output file. |
| |
| procedure Output_Line (From, To : Source_Ptr); |
| -- Output a line or the end of a line from the buffer to the output |
| -- file, followed by an end of line terminator. Depending on the value |
| -- of Deleting and the switches, the line may be commented out, blank or |
| -- not output at all. |
| |
| ------------ |
| -- Output -- |
| ------------ |
| |
| procedure Output (From, To : Source_Ptr) is |
| begin |
| for J in From .. To loop |
| Put_Char (Sinput.Source (J)); |
| end loop; |
| end Output; |
| |
| ----------------- |
| -- Output_Line -- |
| ----------------- |
| |
| procedure Output_Line (From, To : Source_Ptr) is |
| begin |
| if Deleting or Preprocessor_Line then |
| if Blank_Deleted_Lines then |
| New_EOL.all; |
| |
| elsif Comment_Deleted_Lines then |
| Put_Char ('-'); |
| Put_Char ('-'); |
| Put_Char ('!'); |
| |
| if From < To then |
| Put_Char (' '); |
| Output (From, To); |
| end if; |
| |
| New_EOL.all; |
| end if; |
| |
| else |
| Output (From, To); |
| New_EOL.all; |
| end if; |
| end Output_Line; |
| |
| -- Start of processing for Preprocess |
| |
| begin |
| Start_Of_Processing := Scan_Ptr; |
| |
| -- We need to call Scan for the first time, because Initialize_Scanner |
| -- is no longer doing it. |
| |
| Scan.all; |
| |
| Input_Line_Loop : loop |
| exit Input_Line_Loop when Token = Tok_EOF; |
| |
| Preprocessor_Line := False; |
| |
| if Token /= Tok_End_Of_Line then |
| |
| -- Preprocessor line |
| |
| if Token = Tok_Special and then Special_Character = '#' then |
| Preprocessor_Line := True; |
| Scan.all; |
| |
| case Token is |
| |
| -- #if |
| |
| when Tok_If => |
| declare |
| If_Ptr : constant Source_Ptr := Token_Ptr; |
| |
| begin |
| Scan.all; |
| Cond := Expression (not Deleting); |
| |
| -- Check for an eventual "then" |
| |
| if Token = Tok_Then then |
| Scan.all; |
| end if; |
| |
| -- It is an error to have trailing characters after |
| -- the condition or "then". |
| |
| if Token /= Tok_End_Of_Line |
| and then Token /= Tok_EOF |
| then |
| Error_Msg |
| ("extraneous text on preprocessor line", |
| Token_Ptr); |
| Go_To_End_Of_Line; |
| end if; |
| |
| declare |
| -- Set the initial state of this new "#if". |
| -- This must be done before incrementing the |
| -- Last of the table, otherwise function |
| -- Deleting does not report the correct value. |
| |
| New_State : constant Pp_State := |
| (If_Ptr => If_Ptr, |
| Else_Ptr => 0, |
| Deleting => Deleting or (not Cond), |
| Match_Seen => Deleting or Cond); |
| |
| begin |
| Pp_States.Increment_Last; |
| Pp_States.Table (Pp_States.Last) := New_State; |
| end; |
| end; |
| |
| -- #elsif |
| |
| when Tok_Elsif => |
| Cond := False; |
| |
| if Pp_States.Last = 0 |
| or else Pp_States.Table (Pp_States.Last).Else_Ptr |
| /= 0 |
| then |
| Error_Msg ("no IF for this ELSIF", Token_Ptr); |
| |
| else |
| Cond := |
| not Pp_States.Table (Pp_States.Last).Match_Seen; |
| end if; |
| |
| Scan.all; |
| Cond := Expression (Cond); |
| |
| -- Check for an eventual "then" |
| |
| if Token = Tok_Then then |
| Scan.all; |
| end if; |
| |
| -- It is an error to have trailing characters after |
| -- the condition or "then". |
| |
| if Token /= Tok_End_Of_Line |
| and then Token /= Tok_EOF |
| then |
| Error_Msg |
| ("extraneous text on preprocessor line", |
| Token_Ptr); |
| |
| Go_To_End_Of_Line; |
| end if; |
| |
| -- Depending on the value of the condition, set the |
| -- new values of Deleting and Match_Seen. |
| if Pp_States.Last > 0 then |
| if Pp_States.Table (Pp_States.Last).Match_Seen then |
| Pp_States.Table (Pp_States.Last).Deleting := |
| True; |
| else |
| if Cond then |
| Pp_States.Table (Pp_States.Last).Match_Seen := |
| True; |
| Pp_States.Table (Pp_States.Last).Deleting := |
| False; |
| end if; |
| end if; |
| end if; |
| |
| -- #else |
| |
| when Tok_Else => |
| if Pp_States.Last = 0 then |
| Error_Msg ("no IF for this ELSE", Token_Ptr); |
| |
| elsif |
| Pp_States.Table (Pp_States.Last).Else_Ptr /= 0 |
| then |
| Error_Msg ("duplicate ELSE line", Token_Ptr); |
| end if; |
| |
| -- Set the possibly new values of Deleting and |
| -- Match_Seen. |
| |
| if Pp_States.Last > 0 then |
| if Pp_States.Table (Pp_States.Last).Match_Seen then |
| Pp_States.Table (Pp_States.Last).Deleting := |
| True; |
| |
| else |
| Pp_States.Table (Pp_States.Last).Match_Seen := |
| True; |
| Pp_States.Table (Pp_States.Last).Deleting := |
| False; |
| end if; |
| |
| -- Set the Else_Ptr to check for illegal #elsif |
| -- later. |
| |
| Pp_States.Table (Pp_States.Last).Else_Ptr := |
| Token_Ptr; |
| end if; |
| |
| Scan.all; |
| |
| -- It is an error to have characters after "#else" |
| if Token /= Tok_End_Of_Line |
| and then Token /= Tok_EOF |
| then |
| Error_Msg |
| ("extraneous text on preprocessor line", |
| Token_Ptr); |
| Go_To_End_Of_Line; |
| end if; |
| |
| -- #end if; |
| |
| when Tok_End => |
| if Pp_States.Last = 0 then |
| Error_Msg ("no IF for this END", Token_Ptr); |
| end if; |
| |
| Scan.all; |
| |
| if Token /= Tok_If then |
| Error_Msg ("IF expected", Token_Ptr); |
| |
| else |
| Scan.all; |
| |
| if Token /= Tok_Semicolon then |
| Error_Msg ("`;` Expected", Token_Ptr); |
| |
| else |
| Scan.all; |
| |
| -- It is an error to have character after |
| -- "#end if;". |
| if Token /= Tok_End_Of_Line |
| and then Token /= Tok_EOF |
| then |
| Error_Msg |
| ("extraneous text on preprocessor line", |
| Token_Ptr); |
| end if; |
| end if; |
| end if; |
| |
| -- In case of one of the errors above, skip the tokens |
| -- until the end of line is reached. |
| |
| Go_To_End_Of_Line; |
| |
| -- Decrement the depth of the #if stack |
| |
| if Pp_States.Last > 0 then |
| Pp_States.Decrement_Last; |
| end if; |
| |
| -- Illegal preprocessor line |
| |
| when others => |
| if Pp_States.Last = 0 then |
| Error_Msg ("IF expected", Token_Ptr); |
| |
| elsif |
| Pp_States.Table (Pp_States.Last).Else_Ptr = 0 |
| then |
| Error_Msg ("IF, ELSIF, ELSE, or `END IF` expected", |
| Token_Ptr); |
| |
| else |
| Error_Msg ("IF or `END IF` expected", Token_Ptr); |
| end if; |
| |
| -- Skip to the end of this illegal line |
| |
| Go_To_End_Of_Line; |
| end case; |
| |
| -- Not a preprocessor line |
| |
| else |
| -- Do not report errors for those lines, even if there are |
| -- Ada parsing errors. |
| |
| Set_Ignore_Errors (To => True); |
| |
| if Deleting then |
| Go_To_End_Of_Line; |
| |
| else |
| while Token /= Tok_End_Of_Line |
| and then Token /= Tok_EOF |
| loop |
| if Token = Tok_Special |
| and then Special_Character = '$' |
| then |
| declare |
| Dollar_Ptr : constant Source_Ptr := Token_Ptr; |
| Symbol : Symbol_Id; |
| |
| begin |
| Scan.all; |
| Change_Reserved_Keyword_To_Symbol; |
| |
| if Token = Tok_Identifier |
| and then Token_Ptr = Dollar_Ptr + 1 |
| then |
| -- $symbol |
| |
| Symbol := Index_Of (Token_Name); |
| |
| -- If symbol exists, replace by its value |
| |
| if Symbol /= No_Symbol then |
| Output (Start_Of_Processing, Dollar_Ptr - 1); |
| Start_Of_Processing := Scan_Ptr; |
| String_To_Name_Buffer |
| (Mapping.Table (Symbol).Value); |
| |
| if Mapping.Table (Symbol).Is_A_String then |
| |
| -- Value is an Ada string |
| |
| Put_Char ('"'); |
| |
| for J in 1 .. Name_Len loop |
| Put_Char (Name_Buffer (J)); |
| |
| if Name_Buffer (J) = '"' then |
| Put_Char ('"'); |
| end if; |
| end loop; |
| |
| Put_Char ('"'); |
| |
| else |
| -- Value is a sequence of characters, not |
| -- an Ada string. |
| |
| for J in 1 .. Name_Len loop |
| Put_Char (Name_Buffer (J)); |
| end loop; |
| end if; |
| end if; |
| end if; |
| end; |
| end if; |
| |
| Scan.all; |
| end loop; |
| end if; |
| |
| Set_Ignore_Errors (To => False); |
| end if; |
| end if; |
| |
| pragma Assert (Token = Tok_End_Of_Line or Token = Tok_EOF); |
| |
| -- At this point, the token is either end of line or EOF. |
| -- The line to possibly output stops just before the token. |
| |
| Output_Line (Start_Of_Processing, Token_Ptr - 1); |
| |
| -- If we are at the end of a line, the scan pointer is at the first |
| -- non blank character, not necessarily the first character of the |
| -- line; so, we have to deduct Start_Of_Processing from the token |
| -- pointer. |
| |
| if Token = Tok_End_Of_Line then |
| if (Sinput.Source (Token_Ptr) = ASCII.CR |
| and then Sinput.Source (Token_Ptr + 1) = ASCII.LF) |
| or else |
| (Sinput.Source (Token_Ptr) = ASCII.CR |
| and then Sinput.Source (Token_Ptr + 1) = ASCII.LF) |
| then |
| Start_Of_Processing := Token_Ptr + 2; |
| else |
| Start_Of_Processing := Token_Ptr + 1; |
| end if; |
| end if; |
| |
| -- Now, scan the first token of the next line. If the token is EOF, |
| -- the scan ponter will not move, and the token will still be EOF. |
| |
| Set_Ignore_Errors (To => True); |
| Scan.all; |
| Set_Ignore_Errors (To => False); |
| end loop Input_Line_Loop; |
| |
| -- Report an error for any missing some "#end if;" |
| |
| for Level in reverse 1 .. Pp_States.Last loop |
| Error_Msg ("no `END IF` for this IF", Pp_States.Table (Level).If_Ptr); |
| end loop; |
| end Preprocess; |
| |
| ---------------- |
| -- Initialize -- |
| ---------------- |
| |
| procedure Initialize |
| (Error_Msg : Error_Msg_Proc; |
| Scan : Scan_Proc; |
| Set_Ignore_Errors : Set_Ignore_Errors_Proc; |
| Put_Char : Put_Char_Proc; |
| New_EOL : New_EOL_Proc) |
| is |
| begin |
| if not Already_Initialized then |
| Start_String; |
| Store_String_Chars ("True"); |
| True_Value.Value := End_String; |
| |
| Start_String; |
| Empty_String := End_String; |
| |
| Name_Len := 7; |
| Name_Buffer (1 .. Name_Len) := "defined"; |
| Name_Defined := Name_Find; |
| |
| Start_String; |
| Store_String_Chars ("False"); |
| String_False := End_String; |
| |
| Already_Initialized := True; |
| end if; |
| |
| Prep.Error_Msg := Error_Msg; |
| Prep.Scan := Scan; |
| Prep.Set_Ignore_Errors := Set_Ignore_Errors; |
| Prep.Put_Char := Put_Char; |
| Prep.New_EOL := New_EOL; |
| end Initialize; |
| |
| ------------------ |
| -- List_Symbols -- |
| ------------------ |
| |
| procedure List_Symbols (Foreword : String) is |
| Order : array (0 .. Integer (Symbol_Table.Last (Mapping))) |
| of Symbol_Id; |
| -- After alphabetical sorting, this array stores thehe indices of |
| -- the symbols in the order they are displayed. |
| |
| function Lt (Op1, Op2 : Natural) return Boolean; |
| -- Comparison routine for sort call |
| |
| procedure Move (From : Natural; To : Natural); |
| -- Move routine for sort call |
| |
| -------- |
| -- Lt -- |
| -------- |
| |
| function Lt (Op1, Op2 : Natural) return Boolean is |
| S1 : constant String := |
| Get_Name_String (Mapping.Table (Order (Op1)).Symbol); |
| S2 : constant String := |
| Get_Name_String (Mapping.Table (Order (Op2)).Symbol); |
| |
| begin |
| return S1 < S2; |
| end Lt; |
| |
| ---------- |
| -- Move -- |
| ---------- |
| |
| procedure Move (From : Natural; To : Natural) is |
| begin |
| Order (To) := Order (From); |
| end Move; |
| |
| package Sort_Syms is new GNAT.Heap_Sort_G (Move, Lt); |
| |
| Max_L : Natural; |
| -- Maximum length of any symbol |
| |
| -- Start of processing for List_Symbols_Case |
| |
| begin |
| if Symbol_Table.Last (Mapping) = 0 then |
| return; |
| end if; |
| |
| if Foreword'Length > 0 then |
| Write_Eol; |
| Write_Line (Foreword); |
| |
| for J in Foreword'Range loop |
| Write_Char ('='); |
| end loop; |
| end if; |
| |
| -- Initialize the order |
| |
| for J in Order'Range loop |
| Order (J) := Symbol_Id (J); |
| end loop; |
| |
| -- Sort alphabetically |
| |
| Sort_Syms.Sort (Order'Last); |
| |
| Max_L := 7; |
| |
| for J in 1 .. Symbol_Table.Last (Mapping) loop |
| Get_Name_String (Mapping.Table (J).Original); |
| Max_L := Integer'Max (Max_L, Name_Len); |
| end loop; |
| |
| Write_Eol; |
| Write_Str ("Symbol"); |
| |
| for J in 1 .. Max_L - 5 loop |
| Write_Char (' '); |
| end loop; |
| |
| Write_Line ("Value"); |
| |
| Write_Str ("------"); |
| |
| for J in 1 .. Max_L - 5 loop |
| Write_Char (' '); |
| end loop; |
| |
| Write_Line ("------"); |
| |
| for J in 1 .. Order'Last loop |
| declare |
| Data : constant Symbol_Data := Mapping.Table (Order (J)); |
| |
| begin |
| Get_Name_String (Data.Original); |
| Write_Str (Name_Buffer (1 .. Name_Len)); |
| |
| for K in Name_Len .. Max_L loop |
| Write_Char (' '); |
| end loop; |
| |
| String_To_Name_Buffer (Data.Value); |
| |
| if Data.Is_A_String then |
| Write_Char ('"'); |
| |
| for J in 1 .. Name_Len loop |
| Write_Char (Name_Buffer (J)); |
| |
| if Name_Buffer (J) = '"' then |
| Write_Char ('"'); |
| end if; |
| end loop; |
| |
| Write_Char ('"'); |
| |
| else |
| Write_Str (Name_Buffer (1 .. Name_Len)); |
| end if; |
| end; |
| |
| Write_Eol; |
| end loop; |
| |
| Write_Eol; |
| end List_Symbols; |
| |
| ---------------------- |
| -- Matching_Strings -- |
| ---------------------- |
| |
| function Matching_Strings (S1, S2 : String_Id) return Boolean is |
| begin |
| String_To_Name_Buffer (S1); |
| |
| for Index in 1 .. Name_Len loop |
| Name_Buffer (Index) := Fold_Lower (Name_Buffer (Index)); |
| end loop; |
| |
| declare |
| String1 : constant String := Name_Buffer (1 .. Name_Len); |
| |
| begin |
| String_To_Name_Buffer (S2); |
| |
| for Index in 1 .. Name_Len loop |
| Name_Buffer (Index) := Fold_Lower (Name_Buffer (Index)); |
| end loop; |
| |
| return String1 = Name_Buffer (1 .. Name_Len); |
| end; |
| end Matching_Strings; |
| |
| -------------------- |
| -- Parse_Def_File -- |
| -------------------- |
| |
| procedure Parse_Def_File is |
| Symbol : Symbol_Id; |
| Symbol_Name : Name_Id; |
| Original_Name : Name_Id; |
| Data : Symbol_Data; |
| Value_Start : Source_Ptr; |
| Value_End : Source_Ptr; |
| Ch : Character; |
| |
| use ASCII; |
| |
| begin |
| Def_Line_Loop : |
| loop |
| Scan.all; |
| |
| exit Def_Line_Loop when Token = Tok_EOF; |
| |
| if Token /= Tok_End_Of_Line then |
| Change_Reserved_Keyword_To_Symbol; |
| |
| if Token /= Tok_Identifier then |
| Error_Msg ("identifier expected", Token_Ptr); |
| goto Cleanup; |
| end if; |
| |
| Symbol_Name := Token_Name; |
| Name_Len := 0; |
| |
| for Ptr in Token_Ptr .. Scan_Ptr - 1 loop |
| Name_Len := Name_Len + 1; |
| Name_Buffer (Name_Len) := Sinput.Source (Ptr); |
| end loop; |
| |
| Original_Name := Name_Find; |
| Scan.all; |
| |
| if Token /= Tok_Colon_Equal then |
| Error_Msg ("`:=` expected", Token_Ptr); |
| goto Cleanup; |
| end if; |
| |
| Scan.all; |
| |
| if Token = Tok_String_Literal then |
| Data := (Symbol => Symbol_Name, |
| Original => Original_Name, |
| On_The_Command_Line => False, |
| Is_A_String => True, |
| Value => String_Literal_Id); |
| |
| Scan.all; |
| |
| if Token /= Tok_End_Of_Line and then Token /= Tok_EOF then |
| Error_Msg ("extraneous text in definition", Token_Ptr); |
| goto Cleanup; |
| end if; |
| |
| elsif Token = Tok_End_Of_Line or Token = Tok_EOF then |
| Data := (Symbol => Symbol_Name, |
| Original => Original_Name, |
| On_The_Command_Line => False, |
| Is_A_String => False, |
| Value => Empty_String); |
| |
| else |
| Value_Start := Token_Ptr; |
| Value_End := Token_Ptr - 1; |
| Scan_Ptr := Token_Ptr; |
| |
| Value_Chars_Loop : |
| loop |
| Ch := Sinput.Source (Scan_Ptr); |
| |
| case Ch is |
| when '_' | '.' | '0' .. '9' | 'a' .. 'z' | 'A' .. 'Z' => |
| Value_End := Scan_Ptr; |
| Scan_Ptr := Scan_Ptr + 1; |
| |
| when ' ' | HT | VT | CR | LF | FF => |
| exit Value_Chars_Loop; |
| |
| when others => |
| Error_Msg ("illegal character", Scan_Ptr); |
| goto Cleanup; |
| end case; |
| end loop Value_Chars_Loop; |
| |
| Scan.all; |
| |
| if Token /= Tok_End_Of_Line and then Token /= Tok_EOF then |
| Error_Msg ("extraneous text in definition", Token_Ptr); |
| goto Cleanup; |
| end if; |
| |
| Start_String; |
| |
| while Value_Start <= Value_End loop |
| Store_String_Char (Sinput.Source (Value_Start)); |
| Value_Start := Value_Start + 1; |
| end loop; |
| |
| Data := (Symbol => Symbol_Name, |
| Original => Original_Name, |
| On_The_Command_Line => False, |
| Is_A_String => False, |
| Value => End_String); |
| end if; |
| |
| -- Now that we have the value, get the symbol index |
| |
| Symbol := Index_Of (Symbol_Name); |
| |
| if Symbol /= No_Symbol then |
| -- If we already have an entry for this symbol, replace it |
| -- with the new value, except if the symbol was declared |
| -- on the command line. |
| |
| if Mapping.Table (Symbol).On_The_Command_Line then |
| goto Continue; |
| end if; |
| |
| else |
| -- As it is the first time we see this symbol, create a new |
| -- entry in the table. |
| |
| if Mapping.Table = null then |
| Symbol_Table.Init (Mapping); |
| end if; |
| |
| Symbol_Table.Increment_Last (Mapping); |
| Symbol := Symbol_Table.Last (Mapping); |
| end if; |
| |
| Mapping.Table (Symbol) := Data; |
| goto Continue; |
| |
| <<Cleanup>> |
| Set_Ignore_Errors (To => True); |
| |
| while Token /= Tok_End_Of_Line and Token /= Tok_EOF loop |
| Scan.all; |
| end loop; |
| |
| Set_Ignore_Errors (To => False); |
| |
| <<Continue>> |
| null; |
| end if; |
| end loop Def_Line_Loop; |
| end Parse_Def_File; |
| |
| end Prep; |
