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|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G P R E P --
-- --
-- B o d y --
-- --
-- Copyright (C) 2002-2006, 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;
with Err_Vars; use Err_Vars;
with Errutil;
with Gnatvsn; use Gnatvsn;
with Namet; use Namet;
with Opt;
with Osint; use Osint;
with Output; use Output;
with Prep; use Prep;
with Scng;
with Sinput.C;
with Snames;
with Stringt; use Stringt;
with Types; use Types;
with Ada.Text_IO; use Ada.Text_IO;
with GNAT.Case_Util; use GNAT.Case_Util;
with GNAT.Command_Line;
with GNAT.Directory_Operations; use GNAT.Directory_Operations;
with GNAT.OS_Lib; use GNAT.OS_Lib;
package body GPrep is
Copyright_Displayed : Boolean := False;
-- Used to prevent multiple displays of the copyright notice
------------------------
-- Argument Line Data --
------------------------
Infile_Name : Name_Id := No_Name;
Outfile_Name : Name_Id := No_Name;
Deffile_Name : Name_Id := No_Name;
Output_Directory : Name_Id := No_Name;
-- Used when the specified output is an existing directory
Input_Directory : Name_Id := No_Name;
-- Used when the specified input and output are existing directories
Source_Ref_Pragma : Boolean := False;
-- Record command line options (set if -r switch set)
Text_Outfile : aliased Ada.Text_IO.File_Type;
Outfile : constant File_Access := Text_Outfile'Access;
File_Name_Buffer_Initial_Size : constant := 50;
File_Name_Buffer : String_Access :=
new String (1 .. File_Name_Buffer_Initial_Size);
-- A buffer to build output file names from input file names
-----------------
-- Subprograms --
-----------------
procedure Display_Copyright;
-- Display the copyright notice
procedure Obsolescent_Check (S : Source_Ptr);
-- Null procedure, needed by instantiation of Scng below
procedure Post_Scan;
-- Null procedure, needed by instantiation of Scng below
package Scanner is new Scng
(Post_Scan,
Errutil.Error_Msg,
Errutil.Error_Msg_S,
Errutil.Error_Msg_SC,
Errutil.Error_Msg_SP,
Obsolescent_Check,
Errutil.Style);
-- The scanner for the preprocessor
function Is_ASCII_Letter (C : Character) return Boolean;
-- True if C is in 'a' .. 'z' or in 'A' .. 'Z'
procedure Double_File_Name_Buffer;
-- Double the size of the file name buffer
procedure Preprocess_Infile_Name;
-- When the specified output is a directory, preprocess the infile name
-- for symbol substitution, to get the output file name.
procedure Process_Files;
-- Process the single input file or all the files in the directory tree
-- rooted at the input directory.
procedure Process_Command_Line_Symbol_Definition (S : String);
-- Process a -D switch on the command line
procedure Put_Char_To_Outfile (C : Character);
-- Output one character to the output file. Used to initialize the
-- preprocessor.
procedure New_EOL_To_Outfile;
-- Output a new line to the output file. Used to initialize the
-- preprocessor.
procedure Scan_Command_Line;
-- Scan the switches and the file names
procedure Usage;
-- Display the usage
-----------------------
-- Display_Copyright --
-----------------------
procedure Display_Copyright is
begin
if not Copyright_Displayed then
Write_Line ("GNAT Preprocessor " & Gnatvsn.Gnat_Version_String);
Write_Line ("Copyright 1996-" &
Current_Year &
", Free Software Foundation, Inc.");
Copyright_Displayed := True;
end if;
end Display_Copyright;
-----------------------------
-- Double_File_Name_Buffer --
-----------------------------
procedure Double_File_Name_Buffer is
New_Buffer : constant String_Access :=
new String (1 .. 2 * File_Name_Buffer'Length);
begin
New_Buffer (File_Name_Buffer'Range) := File_Name_Buffer.all;
Free (File_Name_Buffer);
File_Name_Buffer := New_Buffer;
end Double_File_Name_Buffer;
--------------
-- Gnatprep --
--------------
procedure Gnatprep is
begin
-- Do some initializations (order is important here!)
Csets.Initialize;
Namet.Initialize;
Snames.Initialize;
Stringt.Initialize;
-- Initialize the preprocessor
Prep.Initialize
(Error_Msg => Errutil.Error_Msg'Access,
Scan => Scanner.Scan'Access,
Set_Ignore_Errors => Errutil.Set_Ignore_Errors'Access,
Put_Char => Put_Char_To_Outfile'Access,
New_EOL => New_EOL_To_Outfile'Access);
-- Set the scanner characteristics for the preprocessor
Scanner.Set_Special_Character ('#');
Scanner.Set_Special_Character ('$');
Scanner.Set_End_Of_Line_As_Token (True);
-- Initialize the mapping table of symbols to values
Prep.Symbol_Table.Init (Prep.Mapping);
-- Parse the switches and arguments
Scan_Command_Line;
if Opt.Verbose_Mode then
Display_Copyright;
end if;
-- Test we had all the arguments needed
if Infile_Name = No_Name then
-- No input file specified, just output the usage and exit
Usage;
return;
elsif Outfile_Name = No_Name then
-- No output file specified, just output the usage and exit
Usage;
return;
end if;
-- If a pragma Source_File_Name, we need to keep line numbers. So, if
-- the deleted lines are not put as comment, we must output them as
-- blank lines.
if Source_Ref_Pragma and (not Opt.Comment_Deleted_Lines) then
Opt.Blank_Deleted_Lines := True;
end if;
-- If we have a definition file, parse it
if Deffile_Name /= No_Name then
declare
Deffile : Source_File_Index;
begin
Errutil.Initialize;
Deffile := Sinput.C.Load_File (Get_Name_String (Deffile_Name));
-- Set Main_Source_File to the definition file for the benefit of
-- Errutil.Finalize.
Sinput.Main_Source_File := Deffile;
if Deffile = No_Source_File then
Fail ("unable to find definition file """,
Get_Name_String (Deffile_Name),
"""");
end if;
Scanner.Initialize_Scanner (Deffile);
Prep.Parse_Def_File;
end;
end if;
-- If there are errors in the definition file, output them and exit
if Total_Errors_Detected > 0 then
Errutil.Finalize (Source_Type => "definition");
Fail ("errors in definition file """,
Get_Name_String (Deffile_Name), """");
end if;
-- If -s switch was specified, print a sorted list of symbol names and
-- values, if any.
if Opt.List_Preprocessing_Symbols then
Prep.List_Symbols (Foreword => "");
end if;
Output_Directory := No_Name;
Input_Directory := No_Name;
-- Check if the specified output is an existing directory
if Is_Directory (Get_Name_String (Outfile_Name)) then
Output_Directory := Outfile_Name;
-- As the output is an existing directory, check if the input too
-- is a directory.
if Is_Directory (Get_Name_String (Infile_Name)) then
Input_Directory := Infile_Name;
end if;
end if;
-- And process the single input or the files in the directory tree
-- rooted at the input directory.
Process_Files;
end Gnatprep;
---------------------
-- Is_ASCII_Letter --
---------------------
function Is_ASCII_Letter (C : Character) return Boolean is
begin
return C in 'A' .. 'Z' or else C in 'a' .. 'z';
end Is_ASCII_Letter;
------------------------
-- New_EOL_To_Outfile --
------------------------
procedure New_EOL_To_Outfile is
begin
New_Line (Outfile.all);
end New_EOL_To_Outfile;
-----------------------
-- Obsolescent_Check --
-----------------------
procedure Obsolescent_Check (S : Source_Ptr) is
pragma Warnings (Off, S);
begin
null;
end Obsolescent_Check;
---------------
-- Post_Scan --
---------------
procedure Post_Scan is
begin
null;
end Post_Scan;
----------------------------
-- Preprocess_Infile_Name --
----------------------------
procedure Preprocess_Infile_Name is
Len : Natural;
First : Positive;
Last : Natural;
Symbol : Name_Id;
Data : Symbol_Data;
begin
-- Initialize the buffer with the name of the input file
Get_Name_String (Infile_Name);
Len := Name_Len;
while File_Name_Buffer'Length < Len loop
Double_File_Name_Buffer;
end loop;
File_Name_Buffer (1 .. Len) := Name_Buffer (1 .. Len);
-- Look for possible symbols in the file name
First := 1;
while First < Len loop
-- A symbol starts with a dollar sign followed by a letter
if File_Name_Buffer (First) = '$' and then
Is_ASCII_Letter (File_Name_Buffer (First + 1))
then
Last := First + 1;
-- Find the last letter of the symbol
while Last < Len and then
Is_ASCII_Letter (File_Name_Buffer (Last + 1))
loop
Last := Last + 1;
end loop;
-- Get the symbol name id
Name_Len := Last - First;
Name_Buffer (1 .. Name_Len) :=
File_Name_Buffer (First + 1 .. Last);
To_Lower (Name_Buffer (1 .. Name_Len));
Symbol := Name_Find;
-- And look for this symbol name in the symbol table
for Index in 1 .. Symbol_Table.Last (Mapping) loop
Data := Mapping.Table (Index);
if Data.Symbol = Symbol then
-- We found the symbol. If its value is not a string,
-- replace the symbol in the file name with the value of
-- the symbol.
if not Data.Is_A_String then
String_To_Name_Buffer (Data.Value);
declare
Sym_Len : constant Positive := Last - First + 1;
Offset : constant Integer := Name_Len - Sym_Len;
New_Len : constant Natural := Len + Offset;
begin
while New_Len > File_Name_Buffer'Length loop
Double_File_Name_Buffer;
end loop;
File_Name_Buffer (Last + 1 + Offset .. New_Len) :=
File_Name_Buffer (Last + 1 .. Len);
Len := New_Len;
Last := Last + Offset;
File_Name_Buffer (First .. Last) :=
Name_Buffer (1 .. Name_Len);
end;
end if;
exit;
end if;
end loop;
-- Skip over the symbol name or its value: we are not checking
-- for another symbol name in the value.
First := Last + 1;
else
First := First + 1;
end if;
end loop;
-- We now have the output file name in the buffer. Get the output
-- path and put it in Outfile_Name.
Get_Name_String (Output_Directory);
Add_Char_To_Name_Buffer (Directory_Separator);
Add_Str_To_Name_Buffer (File_Name_Buffer (1 .. Len));
Outfile_Name := Name_Find;
end Preprocess_Infile_Name;
--------------------------------------------
-- Process_Command_Line_Symbol_Definition --
--------------------------------------------
procedure Process_Command_Line_Symbol_Definition (S : String) is
Data : Symbol_Data;
Symbol : Symbol_Id;
begin
-- Check the symbol definition and get the symbol and its value.
-- Fail if symbol definition is illegal.
Check_Command_Line_Symbol_Definition (S, Data);
Symbol := Index_Of (Data.Symbol);
-- If symbol does not alrady exist, create a new entry in the mapping
-- table.
if Symbol = No_Symbol then
Symbol_Table.Increment_Last (Mapping);
Symbol := Symbol_Table.Last (Mapping);
end if;
Mapping.Table (Symbol) := Data;
end Process_Command_Line_Symbol_Definition;
-------------------
-- Process_Files --
-------------------
procedure Process_Files is
procedure Process_One_File;
-- Process input file Infile_Name and put the result in file
-- Outfile_Name.
procedure Recursive_Process (In_Dir : String; Out_Dir : String);
-- Process recursively files in In_Dir. Results go to Out_Dir
----------------------
-- Process_One_File --
----------------------
procedure Process_One_File is
Infile : Source_File_Index;
begin
-- Create the output file (fails if this does not work)
begin
Create (Text_Outfile, Out_File, Get_Name_String (Outfile_Name));
exception
when others =>
Fail
("unable to create output file """,
Get_Name_String (Outfile_Name), """");
end;
-- Load the input file
Infile := Sinput.C.Load_File (Get_Name_String (Infile_Name));
if Infile = No_Source_File then
Fail ("unable to find input file """,
Get_Name_String (Infile_Name), """");
end if;
-- Set Main_Source_File to the input file for the benefit of
-- Errutil.Finalize.
Sinput.Main_Source_File := Infile;
Scanner.Initialize_Scanner (Infile);
-- Output the SFN pragma if asked to
if Source_Ref_Pragma then
Put_Line (Outfile.all, "pragma Source_Reference (1, """ &
Get_Name_String (Sinput.File_Name (Infile)) &
""");");
end if;
-- Preprocess the input file
Prep.Preprocess;
-- In verbose mode, if there is no error, report it
if Opt.Verbose_Mode and then Err_Vars.Total_Errors_Detected = 0 then
Errutil.Finalize (Source_Type => "input");
end if;
-- If we had some errors, delete the output file, and report them
if Err_Vars.Total_Errors_Detected > 0 then
if Outfile /= Standard_Output then
Delete (Text_Outfile);
end if;
Errutil.Finalize (Source_Type => "input");
OS_Exit (0);
-- Otherwise, close the output file, and we are done
elsif Outfile /= Standard_Output then
Close (Text_Outfile);
end if;
end Process_One_File;
-----------------------
-- Recursive_Process --
-----------------------
procedure Recursive_Process (In_Dir : String; Out_Dir : String) is
Dir_In : Dir_Type;
Name : String (1 .. 255);
Last : Natural;
In_Dir_Name : Name_Id;
Out_Dir_Name : Name_Id;
procedure Set_Directory_Names;
-- Establish or reestablish the current input and output directories
-------------------------
-- Set_Directory_Names --
-------------------------
procedure Set_Directory_Names is
begin
Input_Directory := In_Dir_Name;
Output_Directory := Out_Dir_Name;
end Set_Directory_Names;
-- Start of processing for Recursive_Process
begin
-- Open the current input directory
begin
Open (Dir_In, In_Dir);
exception
when Directory_Error =>
Fail ("could not read directory " & In_Dir);
end;
-- Set the new input and output directory names
Name_Len := In_Dir'Length;
Name_Buffer (1 .. Name_Len) := In_Dir;
In_Dir_Name := Name_Find;
Name_Len := Out_Dir'Length;
Name_Buffer (1 .. Name_Len) := Out_Dir;
Out_Dir_Name := Name_Find;
Set_Directory_Names;
-- Traverse the input directory
loop
Read (Dir_In, Name, Last);
exit when Last = 0;
if Name (1 .. Last) /= "." and then Name (1 .. Last) /= ".." then
declare
Input : constant String :=
In_Dir & Directory_Separator & Name (1 .. Last);
Output : constant String :=
Out_Dir & Directory_Separator & Name (1 .. Last);
begin
-- If input is an ordinary file, process it
if Is_Regular_File (Input) then
-- First get the output file name
Name_Len := Last;
Name_Buffer (1 .. Name_Len) := Name (1 .. Last);
Infile_Name := Name_Find;
Preprocess_Infile_Name;
-- Set the input file name and process the file
Name_Len := Input'Length;
Name_Buffer (1 .. Name_Len) := Input;
Infile_Name := Name_Find;
Process_One_File;
elsif Is_Directory (Input) then
-- Input is a directory. If the corresponding output
-- directory does not already exist, create it.
if not Is_Directory (Output) then
begin
Make_Dir (Dir_Name => Output);
exception
when Directory_Error =>
Fail ("could not create directory """,
Output, """");
end;
end if;
-- And process this new input directory
Recursive_Process (Input, Output);
-- Reestablish the input and output directory names
-- that have been modified by the recursive call.
Set_Directory_Names;
end if;
end;
end if;
end loop;
end Recursive_Process;
-- Start of processing for Process_Files
begin
if Output_Directory = No_Name then
-- If the output is not a directory, fail if the input is
-- an existing directory, to avoid possible problems.
if Is_Directory (Get_Name_String (Infile_Name)) then
Fail ("input file """ & Get_Name_String (Infile_Name) &
""" is a directory");
end if;
-- Just process the single input file
Process_One_File;
elsif Input_Directory = No_Name then
-- Get the output file name from the input file name, and process
-- the single input file.
Preprocess_Infile_Name;
Process_One_File;
else
-- Recursively process files in the directory tree rooted at the
-- input directory.
Recursive_Process
(In_Dir => Get_Name_String (Input_Directory),
Out_Dir => Get_Name_String (Output_Directory));
end if;
end Process_Files;
-------------------------
-- Put_Char_To_Outfile --
-------------------------
procedure Put_Char_To_Outfile (C : Character) is
begin
Put (Outfile.all, C);
end Put_Char_To_Outfile;
-----------------------
-- Scan_Command_Line --
-----------------------
procedure Scan_Command_Line is
Switch : Character;
begin
-- Parse the switches
loop
begin
Switch := GNAT.Command_Line.Getopt ("D: b c C r s u v");
case Switch is
when ASCII.NUL =>
exit;
when 'D' =>
Process_Command_Line_Symbol_Definition
(S => GNAT.Command_Line.Parameter);
when 'b' =>
Opt.Blank_Deleted_Lines := True;
when 'c' =>
Opt.Comment_Deleted_Lines := True;
when 'C' =>
Opt.Replace_In_Comments := True;
when 'r' =>
Source_Ref_Pragma := True;
when 's' =>
Opt.List_Preprocessing_Symbols := True;
when 'u' =>
Opt.Undefined_Symbols_Are_False := True;
when 'v' =>
Opt.Verbose_Mode := True;
when others =>
Fail ("Invalid Switch: -" & Switch);
end case;
exception
when GNAT.Command_Line.Invalid_Switch =>
Write_Str ("Invalid Switch: -");
Write_Line (GNAT.Command_Line.Full_Switch);
Usage;
OS_Exit (1);
end;
end loop;
-- Get the file names
loop
declare
S : constant String := GNAT.Command_Line.Get_Argument;
begin
exit when S'Length = 0;
Name_Len := S'Length;
Name_Buffer (1 .. Name_Len) := S;
if Infile_Name = No_Name then
Infile_Name := Name_Find;
elsif Outfile_Name = No_Name then
Outfile_Name := Name_Find;
elsif Deffile_Name = No_Name then
Deffile_Name := Name_Find;
else
Fail ("too many arguments specifed");
end if;
end;
end loop;
end Scan_Command_Line;
-----------
-- Usage --
-----------
procedure Usage is
begin
Display_Copyright;
Write_Line ("Usage: gnatprep [-bcrsuv] [-Dsymbol=value] " &
"infile outfile [deffile]");
Write_Eol;
Write_Line (" infile Name of the input file");
Write_Line (" outfile Name of the output file");
Write_Line (" deffile Name of the definition file");
Write_Eol;
Write_Line ("gnatprep switches:");
Write_Line (" -b Replace preprocessor lines by blank lines");
Write_Line (" -c Keep preprocessor lines as comments");
Write_Line (" -C Do symbol replacements within comments");
Write_Line (" -D Associate symbol with value");
Write_Line (" -r Generate Source_Reference pragma");
Write_Line (" -s Print a sorted list of symbol names and values");
Write_Line (" -u Treat undefined symbols as FALSE");
Write_Line (" -v Verbose mode");
Write_Eol;
end Usage;
end GPrep;
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