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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T C H O P --
-- --
-- B o d y --
-- --
-- Copyright (C) 1998-2022, 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. --
-- --
------------------------------------------------------------------------------
with Ada.Characters.Conversions; use Ada.Characters.Conversions;
with Ada.Command_Line; use Ada.Command_Line;
with Ada.Directories; use Ada.Directories;
with Ada.Streams.Stream_IO; use Ada.Streams;
with Ada.Text_IO; use Ada.Text_IO;
with System.CRTL; use System; use System.CRTL;
with GNAT.Byte_Order_Mark; use GNAT.Byte_Order_Mark;
with GNAT.Command_Line; use GNAT.Command_Line;
with GNAT.OS_Lib; use GNAT.OS_Lib;
with GNAT.Heap_Sort_G;
with GNAT.Table;
with Switch; use Switch;
with Types;
procedure Gnatchop is
Config_File_Name : constant String_Access := new String'("gnat.adc");
-- The name of the file holding the GNAT configuration pragmas
Gcc : String_Access := new String'("gcc");
-- May be modified by switch --GCC=
Gcc_Set : Boolean := False;
-- True if a switch --GCC= is used
Gnat_Cmd : String_Access;
-- Command to execute the GNAT compiler
Gnat_Args : Argument_List_Access :=
new Argument_List'
(new String'("-c"),
new String'("-x"),
new String'("ada"),
new String'("-gnats"),
new String'("-gnatu"));
-- Arguments used in Gnat_Cmd call
EOF : constant Character := Character'Val (26);
-- Special character to signal end of file. Not required in input files,
-- but properly treated if present. Not generated in output files except
-- as a result of copying input file.
BOM_Length : Natural := 0;
-- Reset to non-zero value if BOM detected at start of file
--------------------
-- File arguments --
--------------------
subtype File_Num is Natural;
subtype File_Offset is Natural;
type File_Entry is record
Name : String_Access;
-- Name of chop file or directory
SR_Name : String_Access;
-- Null unless the chop file starts with a source reference pragma
-- in which case this field points to the file name from this pragma.
end record;
package File is new GNAT.Table
(Table_Component_Type => File_Entry,
Table_Index_Type => File_Num,
Table_Low_Bound => 1,
Table_Initial => 100,
Table_Increment => 100);
Directory : String_Access;
-- Record name of directory, or a null string if no directory given
Compilation_Mode : Boolean := False;
Overwrite_Files : Boolean := False;
Preserve_Mode : Boolean := False;
Quiet_Mode : Boolean := False;
Source_References : Boolean := False;
Verbose_Mode : Boolean := False;
Exit_On_Error : Boolean := False;
-- Global options
Write_gnat_adc : Boolean := False;
-- Gets set true if we append to gnat.adc or create a new gnat.adc.
-- Used to inhibit complaint about no units generated.
---------------
-- Unit list --
---------------
type Line_Num is new Natural;
-- Line number (for source reference pragmas)
type Unit_Count_Type is new Integer;
subtype Unit_Num is Unit_Count_Type range 1 .. Unit_Count_Type'Last;
-- Used to refer to unit number in unit table
type SUnit_Num is new Integer;
-- Used to refer to entry in sorted units table. Note that entry
-- zero is only for use by Heapsort, and is not otherwise referenced.
type Unit_Kind is (Unit_Spec, Unit_Body, Config_Pragmas);
-- Structure to contain all necessary information for one unit.
-- Entries are also temporarily used to record config pragma sequences.
type Unit_Info is record
File_Name : String_Access;
-- File name from GNAT output line
Chop_File : File_Num;
-- File number in chop file sequence
Start_Line : Line_Num;
-- Line number from GNAT output line
Offset : File_Offset;
-- Offset name from GNAT output line
SR_Present : Boolean;
-- Set True if SR parameter present
Length : File_Offset;
-- A length of 0 means that the Unit is the last one in the file
Kind : Unit_Kind;
-- Indicates kind of unit
Sorted_Index : SUnit_Num;
-- Index of unit in sorted unit list
Bufferg : String_Access;
-- Pointer to buffer containing configuration pragmas to be prepended.
-- Null if no pragmas to be prepended.
end record;
-- The following table stores the unit offset information
package Unit is new GNAT.Table
(Table_Component_Type => Unit_Info,
Table_Index_Type => Unit_Count_Type,
Table_Low_Bound => 1,
Table_Initial => 500,
Table_Increment => 100);
-- The following table is used as a sorted index to the Unit.Table.
-- The entries in Unit.Table are not moved, instead we just shuffle
-- the entries in Sorted_Units. Note that the zeroeth entry in this
-- table is used by GNAT.Heap_Sort_G.
package Sorted_Units is new GNAT.Table
(Table_Component_Type => Unit_Num,
Table_Index_Type => SUnit_Num,
Table_Low_Bound => 0,
Table_Initial => 500,
Table_Increment => 100);
function Is_Duplicated (U : SUnit_Num) return Boolean;
-- Returns true if U is duplicated by a later unit.
-- Note that this function returns false for the last entry.
procedure Sort_Units;
-- Sort units and set up sorted unit table
----------------------
-- File_Descriptors --
----------------------
function dup (handle : File_Descriptor) return File_Descriptor;
function dup2 (from, to : File_Descriptor) return File_Descriptor;
---------------------
-- Local variables --
---------------------
Warning_Count : Natural := 0;
-- Count of warnings issued so far
-----------------------
-- Local subprograms --
-----------------------
procedure Error_Msg (Message : String; Warning : Boolean := False);
-- Produce an error message on standard error output
function Files_Exist return Boolean;
-- Check Unit.Table for possible file names that already exist
-- in the file system. Returns true if files exist, False otherwise
function Get_Maximum_File_Name_Length return Integer;
pragma Import (C, Get_Maximum_File_Name_Length,
"__gnat_get_maximum_file_name_length");
-- Function to get maximum file name length for system
Maximum_File_Name_Length : constant Integer := Get_Maximum_File_Name_Length;
Maximum_File_Name_Length_String : constant String :=
Integer'Image
(Maximum_File_Name_Length);
function Locate_Executable
(Program_Name : String;
Look_For_Prefix : Boolean := True) return String_Access;
-- Locate executable for given program name. This takes into account
-- the target-prefix of the current command, if Look_For_Prefix is True.
subtype EOL_Length is Natural range 0 .. 2;
-- Possible lengths of end of line sequence
type EOL_String (Len : EOL_Length := 0) is record
Str : String (1 .. Len);
end record;
function Get_EOL
(Source : not null access String;
Start : Positive) return EOL_String;
-- Return the line terminator used in the passed string
procedure Parse_EOL
(Source : not null access String;
Ptr : in out Positive);
-- On return Source (Ptr) is the first character of the next line
-- or EOF. Source.all must be terminated by EOF.
function Parse_File (Num : File_Num) return Boolean;
-- Calls the GNAT compiler to parse the given source file and parses the
-- output using Parse_Offset_Info. Returns True if parse operation
-- completes, False if some system error (e.g. failure to read the
-- offset information) occurs.
procedure Parse_Offset_Info
(Chop_File : File_Num;
Source : not null access String);
-- Parses the output of the compiler indicating the offsets and names of
-- the compilation units in Chop_File.
procedure Parse_Token
(Source : not null access String;
Ptr : in out Positive;
Token_Ptr : out Positive);
-- Skips any separators and stores the start of the token in Token_Ptr.
-- Then stores the position of the next separator in Ptr. On return
-- Source (Token_Ptr .. Ptr - 1) is the token.
procedure Read_File
(FD : File_Descriptor;
Contents : out String_Access;
Success : out Boolean);
-- Reads file associated with FS into the newly allocated string Contents.
-- Success is true iff the number of bytes read is equal to the file size.
function Report_Duplicate_Units return Boolean;
-- Output messages about duplicate units in the input files in Unit.Table
-- Returns True if any duplicates found, False if no duplicates found.
function Scan_Arguments return Boolean;
-- Scan command line options and set global variables accordingly.
-- Also scan out file and directory arguments. Returns True if scan
-- was successful, and False if the scan fails for any reason.
procedure Usage;
-- Output message on standard output describing syntax of gnatchop command
procedure Warning_Msg (Message : String);
-- Output a warning message on standard error and update warning count
function Write_Chopped_Files (Input : File_Num) return Boolean;
-- Write all units that result from chopping the Input file
procedure Write_Config_File (Input : File_Num; U : Unit_Num);
-- Call to write configuration pragmas (append them to gnat.adc). Input is
-- the file number for the chop file and U identifies the unit entry for
-- the configuration pragmas.
function Get_Config_Pragmas
(Input : File_Num;
U : Unit_Num) return String_Access;
-- Call to read configuration pragmas from given unit entry, and return a
-- buffer containing the pragmas to be appended to following units. Input
-- is the file number for the chop file and U identifies the unit entry for
-- the configuration pragmas.
procedure Write_Source_Reference_Pragma
(Info : Unit_Info;
Line : Line_Num;
File : Stream_IO.File_Type;
EOL : EOL_String;
Success : in out Boolean);
-- If Success is True on entry, writes a source reference pragma using
-- the chop file from Info, and the given line number. On return Success
-- indicates whether the write succeeded. If Success is False on entry,
-- or if the global flag Source_References is False, then the call to
-- Write_Source_Reference_Pragma has no effect. EOL indicates the end
-- of line sequence to be written at the end of the pragma.
procedure Write_Unit
(Source : not null access String;
Num : Unit_Num;
TS_Time : OS_Time;
Write_BOM : Boolean;
Success : out Boolean);
-- Write one compilation unit of the source to file. Source is the pointer
-- to the input string, Num is the unit number, TS_Time is the timestamp,
-- Write_BOM is set True to write a UTF-8 BOM at the start of the file.
-- Success is set True unless the write attempt fails.
---------
-- dup --
---------
function dup (handle : File_Descriptor) return File_Descriptor is
begin
return File_Descriptor (System.CRTL.dup (int (handle)));
end dup;
----------
-- dup2 --
----------
function dup2 (from, to : File_Descriptor) return File_Descriptor is
begin
return File_Descriptor (System.CRTL.dup2 (int (from), int (to)));
end dup2;
---------------
-- Error_Msg --
---------------
procedure Error_Msg (Message : String; Warning : Boolean := False) is
begin
Put_Line (Standard_Error, Message);
if not Warning then
Set_Exit_Status (Failure);
if Exit_On_Error then
raise Types.Terminate_Program;
end if;
end if;
end Error_Msg;
-----------------
-- Files_Exist --
-----------------
function Files_Exist return Boolean is
Exists : Boolean := False;
begin
for SNum in 1 .. SUnit_Num (Unit.Last) loop
-- Only check and report for the last instance of duplicated files
if not Is_Duplicated (SNum) then
declare
Info : constant Unit_Info :=
Unit.Table (Sorted_Units.Table (SNum));
begin
if Is_Writable_File (Info.File_Name.all) then
Error_Msg (Info.File_Name.all
& " already exists, use -w to overwrite");
Exists := True;
end if;
end;
end if;
end loop;
return Exists;
end Files_Exist;
------------------------
-- Get_Config_Pragmas --
------------------------
function Get_Config_Pragmas
(Input : File_Num;
U : Unit_Num) return String_Access
is
Info : Unit_Info renames Unit.Table (U);
FD : File_Descriptor;
Name : aliased constant String :=
File.Table (Input).Name.all & ASCII.NUL;
Length : File_Offset;
Buffer : String_Access;
Result : String_Access;
Success : Boolean;
pragma Warnings (Off, Success);
begin
FD := Open_Read (Name'Address, Binary);
if FD = Invalid_FD then
Error_Msg ("cannot open " & File.Table (Input).Name.all);
return null;
end if;
Read_File (FD, Buffer, Success);
-- A length of 0 indicates that the rest of the file belongs to
-- this unit. The actual length must be calculated now. Take into
-- account that the last character (EOF) must not be written.
if Info.Length = 0 then
Length := Buffer'Last - (Buffer'First + Info.Offset);
else
Length := Info.Length;
end if;
Result := new String'(Buffer (1 .. Length));
Close (FD);
return Result;
end Get_Config_Pragmas;
-------------
-- Get_EOL --
-------------
function Get_EOL
(Source : not null access String;
Start : Positive) return EOL_String
is
Ptr : Positive := Start;
First : Positive;
Last : Natural;
begin
-- Skip to end of line
while Source (Ptr) /= ASCII.CR and then
Source (Ptr) /= ASCII.LF and then
Source (Ptr) /= EOF
loop
Ptr := Ptr + 1;
end loop;
Last := Ptr;
if Source (Ptr) /= EOF then
-- Found CR or LF
First := Ptr;
else
First := Ptr + 1;
end if;
-- Recognize CR/LF
if Source (Ptr) = ASCII.CR and then Source (Ptr + 1) = ASCII.LF then
Last := First + 1;
end if;
return (Len => Last + 1 - First, Str => Source (First .. Last));
end Get_EOL;
-------------------
-- Is_Duplicated --
-------------------
function Is_Duplicated (U : SUnit_Num) return Boolean is
begin
return U < SUnit_Num (Unit.Last)
and then
Unit.Table (Sorted_Units.Table (U)).File_Name.all =
Unit.Table (Sorted_Units.Table (U + 1)).File_Name.all;
end Is_Duplicated;
-----------------------
-- Locate_Executable --
-----------------------
function Locate_Executable
(Program_Name : String;
Look_For_Prefix : Boolean := True) return String_Access
is
Gnatchop_Str : constant String := "gnatchop";
Current_Command : constant String := Normalize_Pathname (Command_Name);
End_Of_Prefix : Natural;
Start_Of_Prefix : Positive;
Start_Of_Suffix : Positive;
Result : String_Access;
begin
Start_Of_Prefix := Current_Command'First;
Start_Of_Suffix := Current_Command'Last + 1;
End_Of_Prefix := Start_Of_Prefix - 1;
if Look_For_Prefix then
-- Find Start_Of_Prefix
for J in reverse Current_Command'Range loop
if Current_Command (J) = '/' or else
Current_Command (J) = Directory_Separator or else
Current_Command (J) = ':'
then
Start_Of_Prefix := J + 1;
exit;
end if;
end loop;
-- Find End_Of_Prefix
for J in Start_Of_Prefix ..
Current_Command'Last - Gnatchop_Str'Length + 1
loop
if Current_Command (J .. J + Gnatchop_Str'Length - 1) =
Gnatchop_Str
then
End_Of_Prefix := J - 1;
exit;
end if;
end loop;
end if;
if End_Of_Prefix > Current_Command'First then
Start_Of_Suffix := End_Of_Prefix + Gnatchop_Str'Length + 1;
end if;
declare
Command : constant String :=
Current_Command (Start_Of_Prefix .. End_Of_Prefix)
& Program_Name
& Current_Command (Start_Of_Suffix ..
Current_Command'Last);
begin
Result := Locate_Exec_On_Path (Command);
if Result = null then
Error_Msg
(Command & ": installation problem, executable not found");
end if;
end;
return Result;
end Locate_Executable;
---------------
-- Parse_EOL --
---------------
procedure Parse_EOL
(Source : not null access String;
Ptr : in out Positive) is
begin
-- Skip to end of line
while Source (Ptr) /= ASCII.CR and then Source (Ptr) /= ASCII.LF
and then Source (Ptr) /= EOF
loop
Ptr := Ptr + 1;
end loop;
if Source (Ptr) /= EOF then
Ptr := Ptr + 1; -- skip CR or LF
end if;
-- Skip past CR/LF or LF/CR combination
if (Source (Ptr) = ASCII.CR or else Source (Ptr) = ASCII.LF)
and then Source (Ptr) /= Source (Ptr - 1)
then
Ptr := Ptr + 1;
end if;
end Parse_EOL;
----------------
-- Parse_File --
----------------
function Parse_File (Num : File_Num) return Boolean is
Chop_Name : constant String_Access := File.Table (Num).Name;
Save_Stdout : constant File_Descriptor := dup (Standout);
Offset_Name : Temp_File_Name;
Offset_FD : File_Descriptor := Invalid_FD;
Buffer : String_Access;
Success : Boolean;
Failure : exception;
begin
-- Display copy of GNAT command if verbose mode
if Verbose_Mode then
Put (Gnat_Cmd.all);
for J in 1 .. Gnat_Args'Length loop
Put (' ');
Put (Gnat_Args (J).all);
end loop;
Put (' ');
Put_Line (Chop_Name.all);
end if;
-- Create temporary file
Create_Temp_File (Offset_FD, Offset_Name);
if Offset_FD = Invalid_FD then
Error_Msg ("gnatchop: cannot create temporary file");
Close (Save_Stdout);
return False;
end if;
-- Redirect Stdout to this temporary file in the Unix way
if dup2 (Offset_FD, Standout) = Invalid_FD then
Error_Msg ("gnatchop: cannot redirect stdout to temporary file");
Close (Save_Stdout);
Close (Offset_FD);
return False;
end if;
-- Call Gnat on the source filename argument with special options
-- to generate offset information. If this special compilation completes
-- successfully then we can do the actual gnatchop operation.
Spawn (Gnat_Cmd.all, Gnat_Args.all & Chop_Name, Success);
if not Success then
Error_Msg (Chop_Name.all & ": parse errors detected");
Error_Msg (Chop_Name.all & ": chop may not be successful");
end if;
-- Restore stdout
if dup2 (Save_Stdout, Standout) = Invalid_FD then
Error_Msg ("gnatchop: cannot restore stdout");
end if;
-- Reopen the file to start reading from the beginning
Close (Offset_FD);
Close (Save_Stdout);
Offset_FD := Open_Read (Offset_Name'Address, Binary);
if Offset_FD = Invalid_FD then
Error_Msg ("gnatchop: cannot access offset info");
raise Failure;
end if;
Read_File (Offset_FD, Buffer, Success);
if not Success then
Error_Msg ("gnatchop: error reading offset info");
Close (Offset_FD);
raise Failure;
else
Parse_Offset_Info (Num, Buffer);
end if;
-- Close and delete temporary file
Close (Offset_FD);
Delete_File (Offset_Name'Address, Success);
return Success;
exception
when Failure | Types.Terminate_Program =>
if Offset_FD /= Invalid_FD then
Close (Offset_FD);
end if;
Delete_File (Offset_Name'Address, Success);
return False;
end Parse_File;
-----------------------
-- Parse_Offset_Info --
-----------------------
procedure Parse_Offset_Info
(Chop_File : File_Num;
Source : not null access String)
is
First_Unit : constant Unit_Num := Unit.Last + 1;
Bufferg : String_Access := null;
Parse_Ptr : File_Offset := Source'First;
Token_Ptr : File_Offset;
Info : Unit_Info;
function Match (Literal : String) return Boolean;
-- Checks if given string appears at the current Token_Ptr location
-- and if so, bumps Parse_Ptr past the token and returns True. If
-- the string is not present, sets Parse_Ptr to Token_Ptr and
-- returns False.
-----------
-- Match --
-----------
function Match (Literal : String) return Boolean is
begin
Parse_Token (Source, Parse_Ptr, Token_Ptr);
if Source'Last + 1 - Token_Ptr < Literal'Length
or else
Source (Token_Ptr .. Token_Ptr + Literal'Length - 1) /= Literal
then
Parse_Ptr := Token_Ptr;
return False;
end if;
Parse_Ptr := Token_Ptr + Literal'Length;
return True;
end Match;
-- Start of processing for Parse_Offset_Info
begin
loop
-- Set default values, should get changed for all
-- units/pragmas except for the last
Info.Chop_File := Chop_File;
Info.Length := 0;
-- Parse the current line of offset information into Info
-- and exit the loop if there are any errors or on EOF.
-- First case, parse a line in the following format:
-- Unit x (spec) line 7, file offset 142, [SR, ]file name x.ads
-- Note that the unit name can be an operator name in quotes.
-- This is of course illegal, but both GNAT and gnatchop handle
-- the case so that this error does not interfere with chopping.
-- The SR ir present indicates that a source reference pragma
-- was processed as part of this unit (and that therefore no
-- Source_Reference pragma should be generated.
if Match ("Unit") then
Parse_Token (Source, Parse_Ptr, Token_Ptr);
if Match ("(body)") then
Info.Kind := Unit_Body;
elsif Match ("(spec)") then
Info.Kind := Unit_Spec;
else
exit;
end if;
exit when not Match ("line");
Parse_Token (Source, Parse_Ptr, Token_Ptr);
Info.Start_Line := Line_Num'Value
(Source (Token_Ptr .. Parse_Ptr - 1));
exit when not Match ("file offset");
Parse_Token (Source, Parse_Ptr, Token_Ptr);
Info.Offset := File_Offset'Value
(Source (Token_Ptr .. Parse_Ptr - 1));
Info.SR_Present := Match ("SR, ");
exit when not Match ("file name");
Parse_Token (Source, Parse_Ptr, Token_Ptr);
Info.File_Name := new String'
(Directory.all & Source (Token_Ptr .. Parse_Ptr - 1));
Parse_EOL (Source, Parse_Ptr);
-- Second case, parse a line of the following form
-- Configuration pragmas at line 10, file offset 223
elsif Match ("Configuration pragmas at") then
Info.Kind := Config_Pragmas;
Info.File_Name := Config_File_Name;
exit when not Match ("line");
Parse_Token (Source, Parse_Ptr, Token_Ptr);
Info.Start_Line := Line_Num'Value
(Source (Token_Ptr .. Parse_Ptr - 1));
exit when not Match ("file offset");
Parse_Token (Source, Parse_Ptr, Token_Ptr);
Info.Offset := File_Offset'Value
(Source (Token_Ptr .. Parse_Ptr - 1));
Parse_EOL (Source, Parse_Ptr);
-- Third case, parse a line of the following form
-- Source_Reference pragma for file "filename"
-- This appears at the start of the file only, and indicates
-- the name to be used on any generated Source_Reference pragmas.
elsif Match ("Source_Reference pragma for file ") then
Parse_Token (Source, Parse_Ptr, Token_Ptr);
File.Table (Chop_File).SR_Name :=
new String'(Source (Token_Ptr + 1 .. Parse_Ptr - 2));
Parse_EOL (Source, Parse_Ptr);
goto Continue;
-- Unrecognized keyword or end of file
else
exit;
end if;
-- Store the data in the Info record in the Unit.Table
Unit.Increment_Last;
Unit.Table (Unit.Last) := Info;
-- If this is not the first unit from the file, calculate
-- the length of the previous unit as difference of the offsets
if Unit.Last > First_Unit then
Unit.Table (Unit.Last - 1).Length :=
Info.Offset - Unit.Table (Unit.Last - 1).Offset;
end if;
-- If not in compilation mode combine current unit with any
-- preceding configuration pragmas.
if not Compilation_Mode
and then Unit.Last > First_Unit
and then Unit.Table (Unit.Last - 1).Kind = Config_Pragmas
then
Info.Start_Line := Unit.Table (Unit.Last - 1).Start_Line;
Info.Offset := Unit.Table (Unit.Last - 1).Offset;
-- Delete the configuration pragma entry
Unit.Table (Unit.Last - 1) := Info;
Unit.Decrement_Last;
end if;
-- If in compilation mode, and previous entry is the initial
-- entry for the file and is for configuration pragmas, then
-- they are to be appended to every unit in the file.
if Compilation_Mode
and then Unit.Last = First_Unit + 1
and then Unit.Table (First_Unit).Kind = Config_Pragmas
then
Bufferg :=
Get_Config_Pragmas
(Unit.Table (Unit.Last - 1).Chop_File, First_Unit);
Unit.Table (Unit.Last - 1) := Info;
Unit.Decrement_Last;
end if;
Unit.Table (Unit.Last).Bufferg := Bufferg;
-- If in compilation mode, and this is not the first item,
-- combine configuration pragmas with previous unit, which
-- will cause an error message to be generated when the unit
-- is compiled.
if Compilation_Mode
and then Unit.Last > First_Unit
and then Unit.Table (Unit.Last).Kind = Config_Pragmas
then
Unit.Decrement_Last;
end if;
<<Continue>>
null;
end loop;
-- Find out if the loop was exited prematurely because of
-- an error or if the EOF marker was found.
if Source (Parse_Ptr) /= EOF then
Error_Msg
(File.Table (Chop_File).Name.all & ": error parsing offset info");
return;
end if;
-- Handle case of a chop file consisting only of config pragmas
if Unit.Last = First_Unit
and then Unit.Table (Unit.Last).Kind = Config_Pragmas
then
-- In compilation mode, we append such a file to gnat.adc
if Compilation_Mode then
Write_Config_File (Unit.Table (Unit.Last).Chop_File, First_Unit);
Unit.Decrement_Last;
-- In default (non-compilation) mode, this is invalid
else
Error_Msg
(File.Table (Chop_File).Name.all &
": no units found (only pragmas)");
Unit.Decrement_Last;
end if;
end if;
-- Handle case of a chop file ending with config pragmas. This can
-- happen only in default non-compilation mode, since in compilation
-- mode such configuration pragmas are part of the preceding unit.
-- We simply concatenate such pragmas to the previous file which
-- will cause a compilation error, which is appropriate.
if Unit.Last > First_Unit
and then Unit.Table (Unit.Last).Kind = Config_Pragmas
then
Unit.Decrement_Last;
end if;
end Parse_Offset_Info;
-----------------
-- Parse_Token --
-----------------
procedure Parse_Token
(Source : not null access String;
Ptr : in out Positive;
Token_Ptr : out Positive)
is
In_Quotes : Boolean := False;
begin
-- Skip separators
while Source (Ptr) = ' ' or else Source (Ptr) = ',' loop
Ptr := Ptr + 1;
end loop;
Token_Ptr := Ptr;
-- Find end-of-token
while (In_Quotes
or else not (Source (Ptr) = ' ' or else Source (Ptr) = ','))
and then Source (Ptr) >= ' '
loop
if Source (Ptr) = '"' then
In_Quotes := not In_Quotes;
end if;
Ptr := Ptr + 1;
end loop;
end Parse_Token;
---------------
-- Read_File --
---------------
procedure Read_File
(FD : File_Descriptor;
Contents : out String_Access;
Success : out Boolean)
is
Length : constant File_Offset := File_Offset (File_Length (FD));
-- Include room for EOF char
Buffer : String_Access := new String (1 .. Length + 1);
This_Read : Integer;
Read_Ptr : File_Offset := 1;
begin
loop
This_Read := Read (FD,
A => Buffer (Read_Ptr)'Address,
N => Length + 1 - Read_Ptr);
Read_Ptr := Read_Ptr + Integer'Max (This_Read, 0);
exit when This_Read <= 0;
end loop;
Buffer (Read_Ptr) := EOF;
-- The following test can fail if there was an I/O error, in which case
-- Success will be set to False.
if Read_Ptr = Length then
Contents := Buffer;
else
Contents := new String (1 .. Read_Ptr);
Contents.all := Buffer (1 .. Read_Ptr);
Free (Buffer);
end if;
Success := Read_Ptr = Length + 1;
end Read_File;
----------------------------
-- Report_Duplicate_Units --
----------------------------
function Report_Duplicate_Units return Boolean is
US : SUnit_Num;
U : Unit_Num;
Duplicates : Boolean := False;
begin
US := 1;
while US < SUnit_Num (Unit.Last) loop
U := Sorted_Units.Table (US);
if Is_Duplicated (US) then
Duplicates := True;
-- Move to last two versions of duplicated file to make it clearer
-- to understand which file is retained in case of overwriting.
while US + 1 < SUnit_Num (Unit.Last) loop
exit when not Is_Duplicated (US + 1);
US := US + 1;
end loop;
U := Sorted_Units.Table (US);
if Overwrite_Files then
Warning_Msg (Unit.Table (U).File_Name.all
& " is duplicated (all but last will be skipped)");
elsif Unit.Table (U).Chop_File =
Unit.Table (Sorted_Units.Table (US + 1)).Chop_File
then
Error_Msg (Unit.Table (U).File_Name.all
& " is duplicated in "
& File.Table (Unit.Table (U).Chop_File).Name.all);
else
Error_Msg (Unit.Table (U).File_Name.all
& " in "
& File.Table (Unit.Table (U).Chop_File).Name.all
& " is duplicated in "
& File.Table
(Unit.Table
(Sorted_Units.Table (US + 1)).Chop_File).Name.all);
end if;
end if;
US := US + 1;
end loop;
if Duplicates and not Overwrite_Files then
Put_Line ("use -w to overwrite files and keep last version");
end if;
return Duplicates;
end Report_Duplicate_Units;
--------------------
-- Scan_Arguments --
--------------------
function Scan_Arguments return Boolean is
Kset : Boolean := False;
-- Set true if -k switch found
begin
Initialize_Option_Scan;
-- Scan options first
loop
case Getopt ("c gnat? h k? p q r v w x -GCC=!") is
when ASCII.NUL =>
exit;
when '-' =>
Gcc := new String'(Parameter);
Gcc_Set := True;
when 'c' =>
Compilation_Mode := True;
when 'g' =>
Gnat_Args :=
new Argument_List'(Gnat_Args.all &
new String'("-gnat" & Parameter));
when 'h' =>
Usage;
raise Types.Terminate_Program;
when 'k' =>
declare
Param : String_Access := new String'(Parameter);
begin
if Param.all /= "" then
for J in Param'Range loop
if Param (J) not in '0' .. '9' then
Error_Msg ("-k# requires numeric parameter");
return False;
end if;
end loop;
else
Param := new String'("8");
end if;
Gnat_Args :=
new Argument_List'(Gnat_Args.all &
new String'("-gnatk" & Param.all));
Kset := True;
end;
when 'p' =>
Preserve_Mode := True;
when 'q' =>
Quiet_Mode := True;
when 'r' =>
Source_References := True;
when 'v' =>
Verbose_Mode := True;
Display_Version ("GNATCHOP", "1998");
when 'w' =>
Overwrite_Files := True;
when 'x' =>
Exit_On_Error := True;
when others =>
null;
end case;
end loop;
if not Kset and then Maximum_File_Name_Length > 0 then
-- If this system has restricted filename lengths, tell gnat1
-- about them, removing the leading blank from the image string.
Gnat_Args :=
new Argument_List'(Gnat_Args.all
& new String'("-gnatk"
& Maximum_File_Name_Length_String
(Maximum_File_Name_Length_String'First + 1
.. Maximum_File_Name_Length_String'Last)));
end if;
-- Scan file names
loop
declare
S : constant String := Get_Argument (Do_Expansion => True);
begin
exit when S = "";
File.Increment_Last;
File.Table (File.Last).Name := new String'(S);
File.Table (File.Last).SR_Name := null;
end;
end loop;
-- Case of more than one file where last file is a directory
if File.Last > 1
and then Is_Directory (File.Table (File.Last).Name.all)
then
Directory := File.Table (File.Last).Name;
File.Decrement_Last;
-- Make sure Directory is terminated with a directory separator,
-- so we can generate the output by just appending a filename.
if Directory (Directory'Last) /= Directory_Separator
and then Directory (Directory'Last) /= '/'
then
Directory := new String'(Directory.all & Directory_Separator);
end if;
-- At least one filename must be given
elsif File.Last = 0 then
if Argument_Count = 0 then
Usage;
else
Try_Help;
end if;
return False;
-- No directory given, set directory to null, so that we can just
-- concatenate the directory name to the file name unconditionally.
else
Directory := new String'("");
end if;
-- Finally check all filename arguments
for File_Num in 1 .. File.Last loop
declare
F : constant String := File.Table (File_Num).Name.all;
begin
if Is_Directory (F) then
Error_Msg (F & " is a directory, cannot be chopped");
return False;
elsif not Is_Regular_File (F) then
Error_Msg (F & " not found");
return False;
end if;
end;
end loop;
return True;
exception
when Invalid_Switch =>
Error_Msg ("invalid switch " & Full_Switch);
return False;
when Invalid_Parameter =>
Error_Msg ("-k switch requires numeric parameter");
return False;
end Scan_Arguments;
----------------
-- Sort_Units --
----------------
procedure Sort_Units is
procedure Move (From : Natural; To : Natural);
-- Procedure used to sort the unit list
-- Unit.Table (To) := Unit_List (From); used by sort
function Lt (Left, Right : Natural) return Boolean;
-- Compares Left and Right units based on file name (first),
-- Chop_File (second) and Offset (third). This ordering is
-- important to keep the last version in case of duplicate files.
package Unit_Sort is new GNAT.Heap_Sort_G (Move, Lt);
-- Used for sorting on filename to detect duplicates
--------
-- Lt --
--------
function Lt (Left, Right : Natural) return Boolean is
L : Unit_Info renames
Unit.Table (Sorted_Units.Table (SUnit_Num (Left)));
R : Unit_Info renames
Unit.Table (Sorted_Units.Table (SUnit_Num (Right)));
begin
return L.File_Name.all < R.File_Name.all
or else (L.File_Name.all = R.File_Name.all
and then (L.Chop_File < R.Chop_File
or else (L.Chop_File = R.Chop_File
and then L.Offset < R.Offset)));
end Lt;
----------
-- Move --
----------
procedure Move (From : Natural; To : Natural) is
begin
Sorted_Units.Table (SUnit_Num (To)) :=
Sorted_Units.Table (SUnit_Num (From));
end Move;
-- Start of processing for Sort_Units
begin
Sorted_Units.Set_Last (SUnit_Num (Unit.Last));
for J in 1 .. Unit.Last loop
Sorted_Units.Table (SUnit_Num (J)) := J;
end loop;
-- Sort Unit.Table, using Sorted_Units.Table (0) as scratch
Unit_Sort.Sort (Natural (Unit.Last));
-- Set the Sorted_Index fields in the unit tables
for J in 1 .. SUnit_Num (Unit.Last) loop
Unit.Table (Sorted_Units.Table (J)).Sorted_Index := J;
end loop;
end Sort_Units;
-----------
-- Usage --
-----------
procedure Usage is
begin
Put_Line
("Usage: gnatchop [-c] [-h] [-k#] " &
"[-r] [-p] [-q] [-v] [-w] [-x] [--GCC=xx] file [file ...] [dir]");
New_Line;
Display_Usage_Version_And_Help;
Put_Line
(" -c compilation mode, configuration pragmas " &
"follow RM rules");
Put_Line
(" -gnatxxx passes the -gnatxxx switch to gnat parser");
Put_Line
(" -h help: output this usage information");
Put_Line
(" -k# krunch file names of generated files to " &
"no more than # characters");
Put_Line
(" -k krunch file names of generated files to " &
"no more than 8 characters");
Put_Line
(" -p preserve time stamp, output files will " &
"have same stamp as input");
Put_Line
(" -q quiet mode, no output of generated file " &
"names");
Put_Line
(" -r generate Source_Reference pragmas refer" &
"encing original source file");
Put_Line
(" -v verbose mode, output version and generat" &
"ed commands");
Put_Line
(" -w overwrite existing filenames");
Put_Line
(" -x exit on error");
Put_Line
(" --GCC=xx specify the path of the gnat parser to be used");
New_Line;
Put_Line
(" file... list of source files to be chopped");
Put_Line
(" dir directory location for split files (defa" &
"ult = current directory)");
end Usage;
-----------------
-- Warning_Msg --
-----------------
procedure Warning_Msg (Message : String) is
begin
Warning_Count := Warning_Count + 1;
Put_Line (Standard_Error, "warning: " & Message);
end Warning_Msg;
-------------------------
-- Write_Chopped_Files --
-------------------------
function Write_Chopped_Files (Input : File_Num) return Boolean is
Name : aliased constant String :=
File.Table (Input).Name.all & ASCII.NUL;
FD : File_Descriptor;
Buffer : String_Access;
Success : Boolean;
TS_Time : OS_Time;
BOM_Present : Boolean;
BOM : BOM_Kind;
-- Record presence of UTF8 BOM in input
begin
FD := Open_Read (Name'Address, Binary);
TS_Time := File_Time_Stamp (FD);
if FD = Invalid_FD then
Error_Msg ("cannot open " & File.Table (Input).Name.all);
return False;
end if;
Read_File (FD, Buffer, Success);
if not Success then
Error_Msg ("cannot read " & File.Table (Input).Name.all);
Close (FD);
return False;
end if;
if not Quiet_Mode then
Put_Line ("splitting " & File.Table (Input).Name.all & " into:");
end if;
-- Test for presence of BOM
Read_BOM (Buffer.all, BOM_Length, BOM, XML_Support => False);
BOM_Present := BOM /= Unknown;
-- Only chop those units that come from this file
for Unit_Number in 1 .. Unit.Last loop
if Unit.Table (Unit_Number).Chop_File = Input then
Write_Unit
(Source => Buffer,
Num => Unit_Number,
TS_Time => TS_Time,
Write_BOM => BOM_Present and then Unit_Number /= 1,
Success => Success);
exit when not Success;
end if;
end loop;
Close (FD);
return Success;
end Write_Chopped_Files;
-----------------------
-- Write_Config_File --
-----------------------
procedure Write_Config_File (Input : File_Num; U : Unit_Num) is
FD : File_Descriptor;
Name : aliased constant String := "gnat.adc" & ASCII.NUL;
Buffer : String_Access;
Success : Boolean;
Append : Boolean;
Buffera : String_Access;
Bufferl : Natural;
begin
Write_gnat_adc := True;
FD := Open_Read_Write (Name'Address, Binary);
if FD = Invalid_FD then
FD := Create_File (Name'Address, Binary);
Append := False;
if not Quiet_Mode then
Put_Line ("writing configuration pragmas from " &
File.Table (Input).Name.all & " to gnat.adc");
end if;
else
Append := True;
if not Quiet_Mode then
Put_Line
("appending configuration pragmas from " &
File.Table (Input).Name.all & " to gnat.adc");
end if;
end if;
Success := FD /= Invalid_FD;
if not Success then
Error_Msg ("cannot create gnat.adc");
return;
end if;
-- In append mode, acquire existing gnat.adc file
if Append then
Read_File (FD, Buffera, Success);
if not Success then
Error_Msg ("cannot read gnat.adc");
return;
end if;
-- Find location of EOF byte if any to exclude from append
Bufferl := 1;
while Bufferl <= Buffera'Last
and then Buffera (Bufferl) /= EOF
loop
Bufferl := Bufferl + 1;
end loop;
Bufferl := Bufferl - 1;
Close (FD);
-- Write existing gnat.adc to new gnat.adc file
FD := Create_File (Name'Address, Binary);
Success := Write (FD, Buffera (1)'Address, Bufferl) = Bufferl;
if not Success then
Error_Msg ("error writing gnat.adc");
return;
end if;
end if;
Buffer := Get_Config_Pragmas (Input, U);
if Buffer /= null then
Success := Write (FD, Buffer.all'Address, Buffer'Length) =
Buffer'Length;
if not Success then
Error_Msg ("disk full writing gnat.adc");
return;
end if;
end if;
Close (FD);
end Write_Config_File;
-----------------------------------
-- Write_Source_Reference_Pragma --
-----------------------------------
procedure Write_Source_Reference_Pragma
(Info : Unit_Info;
Line : Line_Num;
File : Stream_IO.File_Type;
EOL : EOL_String;
Success : in out Boolean)
is
FTE : File_Entry renames Gnatchop.File.Table (Info.Chop_File);
Nam : String_Access;
begin
if Success and then Source_References and then not Info.SR_Present then
if FTE.SR_Name /= null then
Nam := FTE.SR_Name;
else
Nam := FTE.Name;
end if;
declare
Reference : String :=
"pragma Source_Reference (000000, """
& Nam.all & """);" & EOL.Str;
Pos : Positive := Reference'First;
Lin : Line_Num := Line;
begin
while Reference (Pos + 1) /= ',' loop
Pos := Pos + 1;
end loop;
while Reference (Pos) = '0' loop
Reference (Pos) := Character'Val
(Character'Pos ('0') + Lin mod 10);
Lin := Lin / 10;
Pos := Pos - 1;
end loop;
-- Assume there are enough zeroes for any program length
pragma Assert (Lin = 0);
begin
String'Write (Stream_IO.Stream (File), Reference);
Success := True;
exception
when others =>
Success := False;
end;
end;
end if;
end Write_Source_Reference_Pragma;
----------------
-- Write_Unit --
----------------
procedure Write_Unit
(Source : not null access String;
Num : Unit_Num;
TS_Time : OS_Time;
Write_BOM : Boolean;
Success : out Boolean)
is
procedure OS_Filename
(Name : String;
W_Name : Wide_String;
OS_Name : Address;
N_Length : access Natural;
Encoding : Address;
E_Length : access Natural);
pragma Import (C, OS_Filename, "__gnat_os_filename");
-- Returns in OS_Name the proper name for the OS when used with the
-- returned Encoding value. For example on Windows this will return the
-- UTF-8 encoded name into OS_Name and set Encoding to encoding=utf8
-- (the form parameter for Stream_IO).
--
-- Name is the filename and W_Name the same filename in Unicode 16 bits
-- (this corresponds to Win32 Unicode ISO/IEC 10646). N_Length/E_Length
-- are the length returned in OS_Name/Encoding respectively.
Info : Unit_Info renames Unit.Table (Num);
Name : aliased constant String := Info.File_Name.all & ASCII.NUL;
W_Name : aliased constant Wide_String := To_Wide_String (Name);
EOL : constant EOL_String :=
Get_EOL (Source, Source'First + Info.Offset);
OS_Name : aliased String (1 .. Name'Length * 2);
O_Length : aliased Natural := OS_Name'Length;
Encoding : aliased String (1 .. 64);
E_Length : aliased Natural := Encoding'Length;
Length : File_Offset;
begin
-- Skip duplicated files
if Is_Duplicated (Info.Sorted_Index) then
Put_Line (" " & Info.File_Name.all & " skipped");
Success := Overwrite_Files;
return;
end if;
-- Get OS filename
OS_Filename
(Name, W_Name,
OS_Name'Address, O_Length'Access,
Encoding'Address, E_Length'Access);
declare
E_Name : constant String := OS_Name (1 .. O_Length);
OS_Encoding : constant String := Encoding (1 .. E_Length);
File : Stream_IO.File_Type;
begin
begin
if not Overwrite_Files and then Exists (E_Name) then
raise Stream_IO.Name_Error;
else
Stream_IO.Create
(File, Stream_IO.Out_File, E_Name, OS_Encoding);
Success := True;
end if;
exception
when Stream_IO.Name_Error | Stream_IO.Use_Error =>
Error_Msg ("cannot create " & Info.File_Name.all);
return;
end;
-- A length of 0 indicates that the rest of the file belongs to
-- this unit. The actual length must be calculated now. Take into
-- account that the last character (EOF) must not be written.
if Info.Length = 0 then
Length := Source'Last - (Source'First + Info.Offset);
else
Length := Info.Length;
end if;
-- Write BOM if required
if Write_BOM then
String'Write
(Stream_IO.Stream (File),
Source.all (Source'First .. Source'First + BOM_Length - 1));
end if;
-- Prepend configuration pragmas if necessary
if Success and then Info.Bufferg /= null then
Write_Source_Reference_Pragma (Info, 1, File, EOL, Success);
String'Write (Stream_IO.Stream (File), Info.Bufferg.all);
end if;
Write_Source_Reference_Pragma
(Info, Info.Start_Line, File, EOL, Success);
if Success then
begin
String'Write
(Stream_IO.Stream (File),
Source (Source'First + Info.Offset ..
Source'First + Info.Offset + Length - 1));
exception
when Stream_IO.Use_Error | Stream_IO.Device_Error =>
Error_Msg ("disk full writing " & Info.File_Name.all);
return;
end;
end if;
if not Quiet_Mode then
Put_Line (" " & Info.File_Name.all);
end if;
Stream_IO.Close (File);
if Preserve_Mode then
Set_File_Last_Modify_Time_Stamp (E_Name, TS_Time);
end if;
end;
end Write_Unit;
procedure Check_Version_And_Help is new Check_Version_And_Help_G (Usage);
-- Start of processing for gnatchop
begin
-- Add the directory where gnatchop is invoked in front of the path, if
-- gnatchop is invoked with directory information.
declare
Command : constant String := Command_Name;
begin
for Index in reverse Command'Range loop
if Command (Index) = Directory_Separator then
declare
Absolute_Dir : constant String :=
Normalize_Pathname
(Command (Command'First .. Index));
PATH : constant String :=
Absolute_Dir
& Path_Separator
& Getenv ("PATH").all;
begin
Setenv ("PATH", PATH);
end;
exit;
end if;
end loop;
end;
-- Process command line options and initialize global variables
-- First, scan to detect --version and/or --help
Check_Version_And_Help ("GNATCHOP", "1998");
if not Scan_Arguments then
Set_Exit_Status (Failure);
return;
end if;
-- Check presence of required executables
Gnat_Cmd := Locate_Executable (Gcc.all, not Gcc_Set);
if Gnat_Cmd = null then
goto No_Files_Written;
end if;
-- First parse all files and read offset information
for Num in 1 .. File.Last loop
if not Parse_File (Num) then
goto No_Files_Written;
end if;
end loop;
-- Check if any units have been found (assumes non-empty Unit.Table)
if Unit.Last = 0 then
if not Write_gnat_adc then
Error_Msg ("no compilation units found", Warning => True);
end if;
goto No_Files_Written;
end if;
Sort_Units;
-- Check if any duplicate files would be created. If so, emit a warning if
-- Overwrite_Files is true, otherwise generate an error.
if Report_Duplicate_Units and then not Overwrite_Files then
goto No_Files_Written;
end if;
-- Check if any files exist, if so do not write anything Because all files
-- have been parsed and checked already, there won't be any duplicates
if not Overwrite_Files and then Files_Exist then
goto No_Files_Written;
end if;
-- After this point, all source files are read in succession and chopped
-- into their destination files.
-- Source_File_Name pragmas are handled as logical file 0 so write it first
for F in 1 .. File.Last loop
if not Write_Chopped_Files (F) then
Set_Exit_Status (Failure);
return;
end if;
end loop;
if Warning_Count > 0 then
declare
Warnings_Msg : constant String := Warning_Count'Img & " warning(s)";
begin
Error_Msg (Warnings_Msg (2 .. Warnings_Msg'Last), Warning => True);
end;
end if;
return;
<<No_Files_Written>>
-- Special error exit for all situations where no files have
-- been written.
if not Write_gnat_adc then
Error_Msg ("no source files written", Warning => True);
end if;
return;
exception
when Types.Terminate_Program =>
null;
end Gnatchop;