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325 | ------------------------------------------------------------------------------
-- Language Server Protocol --
-- --
-- Copyright (C) 2018-2021, AdaCore --
-- --
-- This 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. This software is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
-- TABILITY 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 this software; see file --
-- COPYING3. If not, go to http://www.gnu.org/licenses for a complete copy --
-- of the license. --
------------------------------------------------------------------------------
--
-- This is driver to run LSP server for Ada language.
with Ada.Characters.Latin_1;
with Ada.Text_IO;
with Ada.Exceptions; use Ada.Exceptions;
with GNAT.Command_Line; use GNAT.Command_Line;
with GNAT.Traceback.Symbolic; use GNAT.Traceback.Symbolic;
with GNAT.OS_Lib;
with GNAT.Strings;
pragma Warnings (Off, "is an internal GNAT unit");
with System.Soft_Links;
with System.Secondary_Stack;
with GNATCOLL.Memory; use GNATCOLL.Memory;
with GNATCOLL.Traces; use GNATCOLL.Traces;
with GNATCOLL.VFS; use GNATCOLL.VFS;
with LSP.Ada_Handlers;
with LSP.Ada_Handlers.Named_Parameters_Commands;
with LSP.Ada_Handlers.Other_File_Commands;
with LSP.Ada_Handlers.Refactor_Imports_Commands;
with LSP.Ada_Handlers.Refactor_Remove_Parameter;
with LSP.Ada_Handlers.Refactor_Move_Parameter;
with LSP.Ada_Handlers.Refactor_Change_Parameter_Mode;
with LSP.Ada_Handlers.Refactor_Suppress_Seperate;
with LSP.Commands;
with LSP.Error_Decorators;
with LSP.Fuzz_Decorators;
with LSP.Memory_Statistics;
with LSP.Predefined_Completion;
with LSP.Servers;
with LSP.Stdio_Streams;
--------------------
-- LSP.Ada_Driver --
--------------------
procedure LSP.Ada_Driver is
function Getenv (Var : String) return String;
-- Return the value set for the given environment variable
procedure On_Uncaught_Exception (E : Exception_Occurrence);
-- Reset LAL contexts in Message_Handler after catching some exception.
procedure Register_Commands;
-- Register all known commands
procedure Die_On_Uncaught (E : Exception_Occurrence);
-- Quit the process when an uncaught exception reaches this. Used for
-- fuzzing.
Server_Trace : constant Trace_Handle := Create ("ALS.MAIN", From_Config);
-- Main trace for the LSP.
In_Trace : constant Trace_Handle := Create ("ALS.IN", Off);
Out_Trace : constant Trace_Handle := Create ("ALS.OUT", Off);
-- Traces that logs all input & output. For debugging purposes.
Server : aliased LSP.Servers.Server;
Stream : aliased LSP.Stdio_Streams.Stdio_Stream;
Handler : aliased LSP.Ada_Handlers.Message_Handler
(Server'Access, Server_Trace);
Error_Decorator : aliased LSP.Error_Decorators.Error_Decorator
(Server_Trace,
Handler'Unchecked_Access,
On_Uncaught_Exception'Unrestricted_Access);
-- This decorator catches all Property_Error exceptions and provides
-- default responses for each request. It also reset Libadalang Context
-- on any other exception.
------------
-- Getenv --
------------
function Getenv (Var : String) return String is
Str : GNAT.Strings.String_Access := GNAT.OS_Lib.Getenv (Var);
begin
return S : constant String := Str.all do
GNAT.Strings.Free (Str);
end return;
end Getenv;
---------------------------
-- On_Uncaught_Exception --
---------------------------
procedure On_Uncaught_Exception (E : Exception_Occurrence) is
begin
Trace (Server_Trace,
"EXCEPTION: " & Exception_Name (E) &
Ada.Characters.Latin_1.LF &
Symbolic_Traceback (E));
Handler.Handle_Error;
end On_Uncaught_Exception;
---------------------
-- Die_On_Uncaught --
---------------------
procedure Die_On_Uncaught (E : Exception_Occurrence) is
begin
Trace (Server_Trace,
"EXCEPTION: " & Exception_Name (E) &
Ada.Characters.Latin_1.LF &
Symbolic_Traceback (E));
-- An exception occurred while fuzzing: make it fatal.
GNAT.OS_Lib.OS_Exit (42);
end Die_On_Uncaught;
-----------------------
-- Register_Commands --
-----------------------
procedure Register_Commands is
begin
LSP.Commands.Register
(LSP.Ada_Handlers.Other_File_Commands.Command'Tag);
LSP.Commands.Register
(LSP.Ada_Handlers.Named_Parameters_Commands.Command'Tag);
LSP.Commands.Register
(LSP.Ada_Handlers.Refactor_Imports_Commands.Command'Tag);
LSP.Commands.Register
(LSP.Ada_Handlers.Refactor_Remove_Parameter.Command'Tag);
LSP.Commands.Register
(LSP.Ada_Handlers.Refactor_Move_Parameter.Command'Tag);
LSP.Commands.Register
(LSP.Ada_Handlers.Refactor_Change_Parameter_Mode.Command'Tag);
LSP.Commands.Register
(LSP.Ada_Handlers.Refactor_Suppress_Seperate.Command'Tag);
end Register_Commands;
use GNAT.Strings;
Cmdline : Command_Line_Configuration;
Fuzzing_Activated : constant Boolean := Getenv ("ALS_FUZZING") /= "";
ALS_Home : constant String := Getenv ("ALS_HOME");
Home_Dir : constant Virtual_File :=
(if ALS_Home /= "" then Create (+ALS_Home)
else Get_Home_Directory);
ALS_Dir : constant Virtual_File := Home_Dir / ".als";
GNATdebug : constant Virtual_File := Create_From_Base
(".gnatdebug");
Tracefile_Name : aliased String_Access;
Config_File : Virtual_File;
Help_Arg : aliased Boolean := False;
Version_Arg : aliased Boolean := False;
Memory_Monitor_Enabled : Boolean;
begin
-- Handle the command line
Set_Usage
(Cmdline,
Help => "Command line interface for the Ada Language Server");
Define_Switch
(Cmdline,
Output => Tracefile_Name'Access,
Long_Switch => "--tracefile=",
Help => "Full path to a file containing traces configuration");
Define_Switch
(Cmdline,
Output => Version_Arg'Access,
Long_Switch => "--version",
Help => "Display the program version");
Define_Switch
(Cmdline,
Output => Help_Arg'Access,
Long_Switch => "--help",
Help => "Display this help");
begin
Getopt (Cmdline);
exception
when GNAT.Command_Line.Exit_From_Command_Line =>
Free (Cmdline);
GNAT.OS_Lib.OS_Exit (0);
end;
Free (Cmdline);
if Version_Arg then
Ada.Text_IO.Put_Line ("ALS version: " & $VERSION);
GNAT.OS_Lib.OS_Exit (0);
end if;
-- Look for a traces file, in this order:
-- - passed on the command line via --tracefile,
-- - in a .gnatdebug file locally
-- - in "traces.cfg" in the ALS home directory
if Tracefile_Name /= null
and then Tracefile_Name.all /= ""
then
Config_File := Create (+Tracefile_Name.all);
if not Config_File.Is_Regular_File then
Ada.Text_IO.Put_Line ("Could not find the specified traces file");
GNAT.OS_Lib.OS_Exit (1);
end if;
Parse_Config_File (Config_File);
elsif GNATdebug.Is_Regular_File then
Parse_Config_File (GNATdebug);
elsif ALS_Dir.Is_Directory then
-- Search for custom traces config in traces.cfg
Parse_Config_File (+Virtual_File'(ALS_Dir / "traces.cfg").Full_Name);
-- Set log file
Set_Default_Stream
(">" & (+Virtual_File'(ALS_Dir / "als").Full_Name) &
".$T.$$.log:buffer_size=0");
end if;
if Tracefile_Name /= null then
Free (Tracefile_Name);
end if;
Server_Trace.Trace ("ALS version: " & $VERSION);
Server_Trace.Trace ("Initializing server ...");
-- Start monitoring the memory if the memory monitor trace is active
Memory_Monitor_Enabled := Create ("DEBUG.ADA_MEMORY").Is_Active;
if Memory_Monitor_Enabled then
GNATCOLL.Memory.Configure
(Activate_Monitor => True);
end if;
-- Load predefined completion items
LSP.Predefined_Completion.Load_Predefined_Completion_Db (Server_Trace);
Server.Initialize (Stream'Unchecked_Access);
begin
Register_Commands;
if Fuzzing_Activated then
-- Fuzzing mode means registering the fuzzing decorators and
-- registering Die_On_Uncaught as error handler.
declare
Fuzz_Requests : aliased LSP.Fuzz_Decorators.Fuzz_Request_Decorator
(Server_Trace,
Error_Decorator'Unchecked_Access,
Die_On_Uncaught'Unrestricted_Access);
Fuzz_Notifications : aliased
LSP.Fuzz_Decorators.Fuzz_Notification_Decorator
(Server_Trace,
Handler'Unchecked_Access,
Handler'Unchecked_Access);
begin
Server.Run
(Fuzz_Requests'Unchecked_Access,
Fuzz_Notifications'Unchecked_Access,
Server => Handler'Unchecked_Access,
On_Error => Die_On_Uncaught'Unrestricted_Access,
Server_Trace => Server_Trace,
In_Trace => In_Trace,
Out_Trace => Out_Trace);
end;
else
Server.Run
(Error_Decorator'Unchecked_Access,
Handler'Unchecked_Access,
Server => Handler'Unchecked_Access,
On_Error => On_Uncaught_Exception'Unrestricted_Access,
Server_Trace => Server_Trace,
In_Trace => In_Trace,
Out_Trace => Out_Trace);
end if;
exception
when E : others =>
Server_Trace.Trace
("FATAL - Unexpected exception in the main thread: "
& Exception_Name (E) & " - " & Exception_Message (E));
Server_Trace.Trace (Symbolic_Traceback (E));
end;
Server_Trace.Trace ("Shutting server down ...");
-- Dump the memory statistics if the memory monitor trace is active
if Memory_Monitor_Enabled then
declare
Memory_Stats : constant String :=
LSP.Memory_Statistics.Dump_Memory_Statistics (3);
begin
Server_Trace.Trace (Memory_Stats);
end;
end if;
Server.Finalize;
Handler.Cleanup;
-- Clean secondary stack up
declare
Stack : System.Secondary_Stack.SS_Stack_Ptr :=
System.Soft_Links.Get_Sec_Stack.all;
begin
System.Secondary_Stack.SS_Free (Stack);
System.Soft_Links.Set_Sec_Stack (Stack);
end;
end LSP.Ada_Driver;
|