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-- --
-- --
-- F R O N T E N D --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2003 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, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
with GNAT.Strings; use GNAT.Strings;
with Atree; use Atree;
with Checks;
with CStand;
with Debug; use Debug;
with Elists;
with Exp_Ch11;
with Exp_Dbug;
with Fmap;
with Fname.UF;
with Hostparm; use Hostparm;
with Inline; use Inline;
with Lib; use Lib;
with Lib.Load; use Lib.Load;
with Live; use Live;
with Namet; use Namet;
with Nlists; use Nlists;
with Opt; use Opt;
with Osint;
with Output; use Output;
with Par;
with Prepcomp;
with Rtsfind;
with Sprint;
with Scn; use Scn;
with Sem; use Sem;
with Sem_Ch8; use Sem_Ch8;
with Sem_Elab; use Sem_Elab;
with Sem_Prag; use Sem_Prag;
with Sem_Warn; use Sem_Warn;
with Sinfo; use Sinfo;
with Sinput; use Sinput;
with Sinput.L; use Sinput.L;
with Tbuild; use Tbuild;
with Types; use Types;
procedure Frontend is
Config_Pragmas : List_Id;
-- Gather configuration pragmas
-- Carry out package initializations. These are initializations which
-- might logically be performed at elaboration time, were it not for
-- the fact that we may be doing things more than once in the big loop
-- over files. Like elaboration, the order in which these calls are
-- made is in some cases important. For example, Lib cannot be
-- initialized until Namet, since it uses names table entries.
-- Create package Standard
-- Check possible symbol definitions specified by -gnateD switches
-- If -gnatep= was specified, parse the preprocessing data file
if Preprocessing_Data_File /= null then
Name_Len := Preprocessing_Data_File'Length;
Name_Buffer (1 .. Name_Len) := Preprocessing_Data_File.all;
Prepcomp.Parse_Preprocessing_Data_File (Name_Find);
-- Otherwise, check if there were preprocessing symbols on the command
-- line and set preprocessing if there are.
end if;
-- Now that the preprocessing situation is established, we are able to
-- load the main source (this is no longer done by Lib.Load.Initalize).
-- Read and process configuration pragma files if present
Save_Style_Check : constant Boolean := Opt.Style_Check;
-- Save style check mode so it can be restored later
Source_Config_File : Source_File_Index;
-- Source reference for -gnatec configuration file
Prag : Node_Id;
-- We always analyze config files with style checks off, since
-- we don't want a miscellaneous gnat.adc that is around to
-- discombobulate intended -gnatg or -gnaty compilations.
Opt.Style_Check := False;
Style_Check := False;
-- Capture current suppress options, which may get modified
Scope_Suppress := Opt.Suppress_Options;
-- First deal with gnat.adc file
if Opt.Config_File then
Name_Buffer (1 .. 8) := "gnat.adc";
Name_Len := 8;
Source_gnat_adc := Load_Config_File (Name_Enter);
if Source_gnat_adc /= No_Source_File then
Initialize_Scanner (No_Unit, Source_gnat_adc);
Config_Pragmas := Par (Configuration_Pragmas => True);
Config_Pragmas := Empty_List;
end if;
Config_Pragmas := Empty_List;
end if;
-- Now deal with specified config pragmas files if there are any
if Opt.Config_File_Names /= null then
for Index in Opt.Config_File_Names'Range loop
Name_Len := Config_File_Names (Index)'Length;
Name_Buffer (1 .. Name_Len) := Config_File_Names (Index).all;
Source_Config_File := Load_Config_File (Name_Enter);
if Source_Config_File = No_Source_File then
("cannot find configuration pragmas file ",
Config_File_Names (Index).all);
end if;
Initialize_Scanner (No_Unit, Source_Config_File);
(Config_Pragmas, Par (Configuration_Pragmas => True));
end loop;
end if;
-- Now analyze all pragmas except those whose analysis must be
-- deferred till after the main unit is analyzed.
if Config_Pragmas /= Error_List
and then Operating_Mode /= Check_Syntax
Prag := First (Config_Pragmas);
while Present (Prag) loop
if not Delay_Config_Pragma_Analyze (Prag) then
Analyze_Pragma (Prag);
end if;
Next (Prag);
end loop;
end if;
-- Restore style check, but if config file turned on checks, leave on!
Opt.Style_Check := Save_Style_Check or Style_Check;
-- Capture any modifications to suppress options from config pragmas
Opt.Suppress_Options := Scope_Suppress;
-- If there was a -gnatem switch, initialize the mappings of unit names to
-- file names and of file names to path names from the mapping file.
if Mapping_File_Name /= null then
Fmap.Initialize (Mapping_File_Name.all);
end if;
-- We have now processed the command line switches, and the gnat.adc
-- file, so this is the point at which we want to capture the values
-- of the configuration switches (see Opt for further details).
-- Initialize the scanner. Note that we do this after the call to
-- Create_Standard, which uses the scanner in its processing of
-- floating-point bounds.
Initialize_Scanner (Main_Unit, Source_Index (Main_Unit));
-- Output header if in verbose mode or full list mode
if Verbose_Mode or Full_List then
if Operating_Mode = Generate_Code then
Write_Str ("Compiling: ");
Write_Str ("Checking: ");
end if;
Write_Name (Full_File_Name (Current_Source_File));
if not Debug_Flag_7 then
Write_Str (" (source file time stamp: ");
Write_Time_Stamp (Current_Source_File);
Write_Char (')');
end if;
end if;
-- Here we call the parser to parse the compilation unit (or units in
-- the check syntax mode, but in that case we won't go on to the
-- semantics in any case).
Discard_List (Par (Configuration_Pragmas => False));
-- The main unit is now loaded, and subunits of it can be loaded,
-- without reporting spurious loading circularities.
Set_Loading (Main_Unit, False);
-- Now that the main unit is installed, we can complete the analysis
-- of the pragmas in gnat.adc and the configuration file, that require
-- a context for their semantic processing.
if Config_Pragmas /= Error_List
and then Operating_Mode /= Check_Syntax
-- Pragmas that require some semantic activity, such as
-- Interrupt_State, cannot be processed until the main unit
-- is installed, because they require a compilation unit on
-- which to attach with_clauses, etc. So analyze them now.
Prag : Node_Id;
Prag := First (Config_Pragmas);
while Present (Prag) loop
if Delay_Config_Pragma_Analyze (Prag) then
Analyze_Pragma (Prag);
end if;
Next (Prag);
end loop;
end if;
-- Now on to the semantics. Skip if in syntax only mode
if Operating_Mode /= Check_Syntax then
-- Install the configuration pragmas in the tree
Set_Config_Pragmas (Aux_Decls_Node (Cunit (Main_Unit)), Config_Pragmas);
-- Following steps are skipped if we had a fatal error during parsing
if not Fatal_Error (Main_Unit) then
-- Reset Operating_Mode to Check_Semantics for subunits. We cannot
-- actually generate code for subunits, so we suppress expansion.
-- This also corrects certain problems that occur if we try to
-- incorporate subunits at a lower level.
if Operating_Mode = Generate_Code
and then Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
Operating_Mode := Check_Semantics;
end if;
-- Analyze (and possibly expand) main unit
Scope_Suppress := Suppress_Options;
Semantics (Cunit (Main_Unit));
-- Cleanup processing after completing main analysis
if Operating_Mode = Generate_Code
or else (Operating_Mode = Check_Semantics
and then ASIS_Mode)
end if;
if Operating_Mode = Generate_Code then
if Inline_Processing_Required then
end if;
-- Remove entities from program that do not have any
-- execution time references.
if Debug_Flag_UU then
end if;
-- Build unit exception table. We leave this up to the end to
-- make sure that all the necessary information is at hand.
end if;
-- List library units if requested
if List_Units then
end if;
-- Output any messages for unreferenced entities
end if;
end if;
-- Qualify all entity names in inner packages, package bodies, etc.,
-- except when compiling for the JVM back end, which depends on
-- having unqualified names in certain cases and handles the
-- generation of qualified names when needed.
if not Java_VM then
end if;
-- Dump the source now. Note that we do this as soon as the analysis
-- of the tree is complete, because it is not just a dump in the case
-- of -gnatD, where it rewrites all source locations in the tree.
-- If a mapping file has been specified by a -gnatem switch, update
-- it if there has been some sourcs that were not in the mappings.
if Mapping_File_Name /= null then
Fmap.Update_Mapping_File (Mapping_File_Name.all);
end if;
end Frontend;