------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T 1 D R V --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2010, 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 Atree; use Atree;
with Back_End; use Back_End;
with Comperr;
with Csets; use Csets;
with Debug; use Debug;
with Elists;
with Errout; use Errout;
with Exp_CG;
with Fmap;
with Fname; use Fname;
with Fname.UF; use Fname.UF;
with Frontend;
with Gnatvsn; use Gnatvsn;
with Hostparm;
with Inline;
with Lib; use Lib;
with Lib.Writ; use Lib.Writ;
with Lib.Xref;
with Namet; use Namet;
with Nlists;
with Opt; use Opt;
with Osint; use Osint;
with Output; use Output;
with Par_SCO;
with Prepcomp;
with Repinfo; use Repinfo;
with Restrict;
with Rident; use Rident;
with Rtsfind;
with SCOs;
with Sem;
with Sem_Ch8;
with Sem_Ch12;
with Sem_Ch13;
with Sem_Elim;
with Sem_Eval;
with Sem_Type;
with Sinfo; use Sinfo;
with Sinput.L; use Sinput.L;
with Snames;
with Sprint; use Sprint;
with Stringt;
with Stylesw; use Stylesw;
with Targparm; use Targparm;
with Tree_Gen;
with Treepr; use Treepr;
with Ttypes;
with Types; use Types;
with Uintp; use Uintp;
with Uname; use Uname;
with Urealp;
with Usage;
with Validsw; use Validsw;
with System.Assertions;
procedure Gnat1drv is
Main_Unit_Node : Node_Id;
-- Compilation unit node for main unit
Main_Kind : Node_Kind;
-- Kind of main compilation unit node
Back_End_Mode : Back_End.Back_End_Mode_Type;
-- Record back end mode
procedure Adjust_Global_Switches;
-- There are various interactions between front end switch settings,
-- including debug switch settings and target dependent parameters.
-- This procedure takes care of properly handling these interactions.
-- We do it after scanning out all the switches, so that we are not
-- depending on the order in which switches appear.
procedure Check_Bad_Body;
-- Called to check if the unit we are compiling has a bad body
procedure Check_Rep_Info;
-- Called when we are not generating code, to check if -gnatR was requested
-- and if so, explain that we will not be honoring the request.
procedure Check_Library_Items;
-- For debugging -- checks the behavior of Walk_Library_Items
pragma Warnings (Off, Check_Library_Items);
-- In case the call below is commented out
----------------------------
-- Adjust_Global_Switches --
----------------------------
procedure Adjust_Global_Switches is
begin
-- Debug flag -gnatd.I is a synonym for Generate_SCIL and requires code
-- generation.
if Debug_Flag_Dot_II
and then Operating_Mode = Generate_Code
then
Generate_SCIL := True;
end if;
-- Disable CodePeer_Mode in Check_Syntax, since we need front-end
-- expansion.
if Operating_Mode = Check_Syntax then
CodePeer_Mode := False;
end if;
-- Set ASIS mode if -gnatt and -gnatc are set
if Operating_Mode = Check_Semantics and then Tree_Output then
ASIS_Mode := True;
-- Turn off inlining in ASIS mode, since ASIS cannot handle the extra
-- information in the trees caused by inlining being active.
-- More specifically, the tree seems to be malformed from the ASIS
-- point of view if -gnatc and -gnatn appear together???
Inline_Active := False;
-- Turn off SCIL generation and CodePeer mode in semantics mode,
-- since SCIL requires front-end expansion.
Generate_SCIL := False;
CodePeer_Mode := False;
end if;
-- SCIL mode needs to disable front-end inlining since the generated
-- trees (in particular order and consistency between specs compiled
-- as part of a main unit or as part of a with-clause) are causing
-- troubles.
if Generate_SCIL then
Front_End_Inlining := False;
end if;
-- Tune settings for optimal SCIL generation in CodePeer mode
if CodePeer_Mode then
-- Turn off inlining, confuses CodePeer output and gains nothing
Front_End_Inlining := False;
Inline_Active := False;
-- Disable front-end optimizations, to keep the tree as close to the
-- source code as possible, and also to avoid inconsistencies between
-- trees when using different optimization switches.
Optimization_Level := 0;
-- Enable some restrictions systematically to simplify the generated
-- code (and ease analysis). Note that restriction checks are also
-- disabled in CodePeer mode, see Restrict.Check_Restriction, and
-- user specified Restrictions pragmas are ignored, see
-- Sem_Prag.Process_Restrictions_Or_Restriction_Warnings.
Restrict.Restrictions.Set (No_Initialize_Scalars) := True;
Restrict.Restrictions.Set (No_Task_Hierarchy) := True;
Restrict.Restrictions.Set (No_Abort_Statements) := True;
Restrict.Restrictions.Set (Max_Asynchronous_Select_Nesting) := True;
Restrict.Restrictions.Value (Max_Asynchronous_Select_Nesting) := 0;
-- Suppress overflow, division by zero and access checks since they
-- are handled implicitly by CodePeer.
-- Turn off dynamic elaboration checks: generates inconsistencies in
-- trees between specs compiled as part of a main unit or as part of
-- a with-clause.
-- Turn off alignment checks: these cannot be proved statically by
-- CodePeer and generate false positives.
-- Enable all other language checks
Suppress_Options :=
(Access_Check => True,
Alignment_Check => True,
Division_Check => True,
Elaboration_Check => True,
Overflow_Check => True,
others => False);
Enable_Overflow_Checks := False;
Dynamic_Elaboration_Checks := False;
-- Kill debug of generated code, since it messes up sloc values
Debug_Generated_Code := False;
-- Turn cross-referencing on in case it was disabled (e.g. by -gnatD)
-- Do we really need to spend time generating xref in CodePeer
-- mode??? Consider setting Xref_Active to False.
Xref_Active := True;
-- Polling mode forced off, since it generates confusing junk
Polling_Required := False;
-- Set operating mode to Generate_Code to benefit from full front-end
-- expansion (e.g. generics).
Operating_Mode := Generate_Code;
-- We need SCIL generation of course
Generate_SCIL := True;
-- Enable assertions and debug pragmas, since they give CodePeer
-- valuable extra information.
Assertions_Enabled := True;
Debug_Pragmas_Enabled := True;
-- Disable all simple value propagation. This is an optimization
-- which is valuable for code optimization, and also for generation
-- of compiler warnings, but these are being turned off by default,
-- and CodePeer generates better messages (referencing original
-- variables) this way.
Debug_Flag_MM := True;
-- Set normal RM validity checking, and checking of IN OUT parameters
-- (this might give CodePeer more useful checks to analyze, to be
-- confirmed???). All other validity checking is turned off, since
-- this can generate very complex trees that only confuse CodePeer
-- and do not bring enough useful info.
Reset_Validity_Check_Options;
Validity_Check_Default := True;
Validity_Check_In_Out_Params := True;
Validity_Check_In_Params := True;
-- Turn off style check options since we are not interested in any
-- front-end warnings when we are getting CodePeer output.
Reset_Style_Check_Options;
-- Always perform semantics and generate ali files in CodePeer mode,
-- so that a gnatmake -c -k will proceed further when possible.
Force_ALI_Tree_File := True;
Try_Semantics := True;
end if;
-- Set Configurable_Run_Time mode if system.ads flag set
if Targparm.Configurable_Run_Time_On_Target or Debug_Flag_YY then
Configurable_Run_Time_Mode := True;
end if;
-- Set -gnatR3m mode if debug flag A set
if Debug_Flag_AA then
Back_Annotate_Rep_Info := True;
List_Representation_Info := 1;
List_Representation_Info_Mechanisms := True;
end if;
-- Force Target_Strict_Alignment true if debug flag -gnatd.a is set
if Debug_Flag_Dot_A then
Ttypes.Target_Strict_Alignment := True;
end if;
-- Disable static allocation of dispatch tables if -gnatd.t or if layout
-- is enabled. The front end's layout phase currently treats types that
-- have discriminant-dependent arrays as not being static even when a
-- discriminant constraint on the type is static, and this leads to
-- problems with subtypes of type Ada.Tags.Dispatch_Table_Wrapper. ???
if Debug_Flag_Dot_T or else Frontend_Layout_On_Target then
Static_Dispatch_Tables := False;
end if;
-- Flip endian mode if -gnatd8 set
if Debug_Flag_8 then
Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
end if;
-- Deal with forcing OpenVMS switches True if debug flag M is set, but
-- record the setting of Targparm.Open_VMS_On_Target in True_VMS_Target
-- before doing this, so we know if we are in real OpenVMS or not!
Opt.True_VMS_Target := Targparm.OpenVMS_On_Target;
if Debug_Flag_M then
Targparm.OpenVMS_On_Target := True;
Hostparm.OpenVMS := True;
end if;
-- Activate front end layout if debug flag -gnatdF is set
if Debug_Flag_FF then
Targparm.Frontend_Layout_On_Target := True;
end if;
-- Set and check exception mechanism
if Targparm.ZCX_By_Default_On_Target then
if Targparm.GCC_ZCX_Support_On_Target then
Exception_Mechanism := Back_End_Exceptions;
else
Osint.Fail ("Zero Cost Exceptions not supported on this target");
end if;
end if;
-- Set proper status for overflow checks. We turn on overflow checks if
-- -gnatp was not specified, and either -gnato is set or the back-end
-- takes care of overflow checks. Otherwise we suppress overflow checks
-- by default (since front end checks are expensive).
if not Opt.Suppress_Checks
and then (Opt.Enable_Overflow_Checks
or else
(Targparm.Backend_Divide_Checks_On_Target
and
Targparm.Backend_Overflow_Checks_On_Target))
then
Suppress_Options (Overflow_Check) := False;
else
Suppress_Options (Overflow_Check) := True;
end if;
-- Set switch indicating if we can use N_Expression_With_Actions
-- Debug flag -gnatd.X decisively sets usage on
if Debug_Flag_Dot_XX then
Use_Expression_With_Actions := True;
-- Debug flag -gnatd.Y decisively sets usage off
elsif Debug_Flag_Dot_YY then
Use_Expression_With_Actions := False;
-- Otherwise this feature is implemented, so we allow its use
else
Use_Expression_With_Actions := True;
end if;
-- Set switch indicating if back end can handle limited types, and
-- guarantee that no incorrect copies are made (e.g. in the context
-- of a conditional expression).
-- Debug flag -gnatd.L decisively sets usage on
if Debug_Flag_Dot_LL then
Back_End_Handles_Limited_Types := True;
-- If no debug flag, usage off for AAMP, VM, SCIL cases
elsif AAMP_On_Target
or else VM_Target /= No_VM
or else Generate_SCIL
then
Back_End_Handles_Limited_Types := False;
-- Otherwise normal gcc back end, for now still turn flag off by
-- default, since there are unresolved problems in the front end.
else
Back_End_Handles_Limited_Types := False;
end if;
end Adjust_Global_Switches;
--------------------
-- Check_Bad_Body --
--------------------
procedure Check_Bad_Body is
Sname : Unit_Name_Type;
Src_Ind : Source_File_Index;
Fname : File_Name_Type;
procedure Bad_Body_Error (Msg : String);
-- Issue message for bad body found
--------------------
-- Bad_Body_Error --
--------------------
procedure Bad_Body_Error (Msg : String) is
begin
Error_Msg_N (Msg, Main_Unit_Node);
Error_Msg_File_1 := Fname;
Error_Msg_N ("remove incorrect body in file{!", Main_Unit_Node);
end Bad_Body_Error;
-- Start of processing for Check_Bad_Body
begin
-- Nothing to do if we are only checking syntax, because we don't know
-- enough to know if we require or forbid a body in this case.
if Operating_Mode = Check_Syntax then
return;
end if;
-- Check for body not allowed
if (Main_Kind = N_Package_Declaration
and then not Body_Required (Main_Unit_Node))
or else (Main_Kind = N_Generic_Package_Declaration
and then not Body_Required (Main_Unit_Node))
or else Main_Kind = N_Package_Renaming_Declaration
or else Main_Kind = N_Subprogram_Renaming_Declaration
or else Nkind (Original_Node (Unit (Main_Unit_Node)))
in N_Generic_Instantiation
then
Sname := Unit_Name (Main_Unit);
-- If we do not already have a body name, then get the body name
-- (but how can we have a body name here???)
if not Is_Body_Name (Sname) then
Sname := Get_Body_Name (Sname);
end if;
Fname := Get_File_Name (Sname, Subunit => False);
Src_Ind := Load_Source_File (Fname);
-- Case where body is present and it is not a subunit. Exclude the
-- subunit case, because it has nothing to do with the package we are
-- compiling. It is illegal for a child unit and a subunit with the
-- same expanded name (RM 10.2(9)) to appear together in a partition,
-- but there is nothing to stop a compilation environment from having
-- both, and the test here simply allows that. If there is an attempt
-- to include both in a partition, this is diagnosed at bind time. In
-- Ada 83 mode this is not a warning case.
-- Note: if weird file names are being used, we can have a situation
-- where the file name that supposedly contains body in fact contains
-- a spec, or we can't tell what it contains. Skip the error message
-- in these cases.
-- Also ignore body that is nothing but pragma No_Body; (that's the
-- whole point of this pragma, to be used this way and to cause the
-- body file to be ignored in this context).
if Src_Ind /= No_Source_File
and then Get_Expected_Unit_Type (Fname) = Expect_Body
and then not Source_File_Is_Subunit (Src_Ind)
and then not Source_File_Is_No_Body (Src_Ind)
then
Errout.Finalize (Last_Call => False);
Error_Msg_Unit_1 := Sname;
-- Ada 83 case of a package body being ignored. This is not an
-- error as far as the Ada 83 RM is concerned, but it is almost
-- certainly not what is wanted so output a warning. Give this
-- message only if there were no errors, since otherwise it may
-- be incorrect (we may have misinterpreted a junk spec as not
-- needing a body when it really does).
if Main_Kind = N_Package_Declaration
and then Ada_Version = Ada_83
and then Operating_Mode = Generate_Code
and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
and then not Compilation_Errors
then
Error_Msg_N
("package $$ does not require a body?", Main_Unit_Node);
Error_Msg_File_1 := Fname;
Error_Msg_N ("body in file{? will be ignored", Main_Unit_Node);
-- Ada 95 cases of a body file present when no body is
-- permitted. This we consider to be an error.
else
-- For generic instantiations, we never allow a body
if Nkind (Original_Node (Unit (Main_Unit_Node)))
in N_Generic_Instantiation
then
Bad_Body_Error
("generic instantiation for $$ does not allow a body");
-- A library unit that is a renaming never allows a body
elsif Main_Kind in N_Renaming_Declaration then
Bad_Body_Error
("renaming declaration for $$ does not allow a body!");
-- Remaining cases are packages and generic packages. Here
-- we only do the test if there are no previous errors,
-- because if there are errors, they may lead us to
-- incorrectly believe that a package does not allow a body
-- when in fact it does.
elsif not Compilation_Errors then
if Main_Kind = N_Package_Declaration then
Bad_Body_Error
("package $$ does not allow a body!");
elsif Main_Kind = N_Generic_Package_Declaration then
Bad_Body_Error
("generic package $$ does not allow a body!");
end if;
end if;
end if;
end if;
end if;
end Check_Bad_Body;
-------------------------
-- Check_Library_Items --
-------------------------
-- Walk_Library_Items has plenty of assertions, so all we need to do is
-- call it, just for these assertions, not actually doing anything else.
procedure Check_Library_Items is
procedure Action (Item : Node_Id);
-- Action passed to Walk_Library_Items to do nothing
------------
-- Action --
------------
procedure Action (Item : Node_Id) is
begin
null;
end Action;
procedure Walk is new Sem.Walk_Library_Items (Action);
-- Start of processing for Check_Library_Items
begin
Walk;
end Check_Library_Items;
--------------------
-- Check_Rep_Info --
--------------------
procedure Check_Rep_Info is
begin
if List_Representation_Info /= 0
or else List_Representation_Info_Mechanisms
then
Set_Standard_Error;
Write_Eol;
Write_Str
("cannot generate representation information, no code generated");
Write_Eol;
Write_Eol;
Set_Standard_Output;
end if;
end Check_Rep_Info;
-- Start of processing for Gnat1drv
begin
-- This inner block is set up to catch assertion errors and constraint
-- errors. Since the code for handling these errors can cause another
-- exception to be raised (namely Unrecoverable_Error), we need two
-- nested blocks, so that the outer one handles unrecoverable error.
begin
-- Initialize all packages. For the most part, these initialization
-- calls can be made in any order. Exceptions are as follows:
-- Lib.Initialize need to be called before Scan_Compiler_Arguments,
-- because it initializes a table filled by Scan_Compiler_Arguments.
Osint.Initialize;
Fmap.Reset_Tables;
Lib.Initialize;
Lib.Xref.Initialize;
Scan_Compiler_Arguments;
Osint.Add_Default_Search_Dirs;
Nlists.Initialize;
Sinput.Initialize;
Sem.Initialize;
Exp_CG.Initialize;
Csets.Initialize;
Uintp.Initialize;
Urealp.Initialize;
Errout.Initialize;
SCOs.Initialize;
Snames.Initialize;
Stringt.Initialize;
Inline.Initialize;
Par_SCO.Initialize;
Sem_Ch8.Initialize;
Sem_Ch12.Initialize;
Sem_Ch13.Initialize;
Sem_Elim.Initialize;
Sem_Eval.Initialize;
Sem_Type.Init_Interp_Tables;
-- Acquire target parameters from system.ads (source of package System)
declare
use Sinput;
S : Source_File_Index;
N : File_Name_Type;
begin
Name_Buffer (1 .. 10) := "system.ads";
Name_Len := 10;
N := Name_Find;
S := Load_Source_File (N);
if S = No_Source_File then
Write_Line
("fatal error, run-time library not installed correctly");
Write_Line ("cannot locate file system.ads");
raise Unrecoverable_Error;
-- Remember source index of system.ads (which was read successfully)
else
System_Source_File_Index := S;
end if;
Targparm.Get_Target_Parameters
(System_Text => Source_Text (S),
Source_First => Source_First (S),
Source_Last => Source_Last (S));
-- Acquire configuration pragma information from Targparm
Restrict.Restrictions := Targparm.Restrictions_On_Target;
end;
Adjust_Global_Switches;
-- Output copyright notice if full list mode unless we have a list
-- file, in which case we defer this so that it is output in the file
if (Verbose_Mode or else (Full_List and then Full_List_File_Name = null))
and then not Debug_Flag_7
then
Write_Eol;
Write_Str ("GNAT ");
Write_Str (Gnat_Version_String);
Write_Eol;
Write_Str ("Copyright 1992-" & Current_Year
& ", Free Software Foundation, Inc.");
Write_Eol;
end if;
-- Check we do not have more than one source file, this happens only in
-- the case where the driver is called directly, it cannot happen when
-- gnat1 is invoked from gcc in the normal case.
if Osint.Number_Of_Files /= 1 then
Usage;
Write_Eol;
Osint.Fail ("you must provide one source file");
elsif Usage_Requested then
Usage;
end if;
Original_Operating_Mode := Operating_Mode;
Frontend;
-- Exit with errors if the main source could not be parsed
if Sinput.Main_Source_File = No_Source_File then
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Exit_Program (E_Errors);
end if;
Main_Unit_Node := Cunit (Main_Unit);
Main_Kind := Nkind (Unit (Main_Unit_Node));
Check_Bad_Body;
-- Exit if compilation errors detected
Errout.Finalize (Last_Call => False);
if Compilation_Errors then
Treepr.Tree_Dump;
Sem_Ch13.Validate_Unchecked_Conversions;
Sem_Ch13.Validate_Address_Clauses;
Sem_Ch13.Validate_Independence;
Errout.Output_Messages;
Namet.Finalize;
-- Generate ALI file if specially requested
if Opt.Force_ALI_Tree_File then
Write_ALI (Object => False);
Tree_Gen;
end if;
Errout.Finalize (Last_Call => True);
Exit_Program (E_Errors);
end if;
-- Set Generate_Code on main unit and its spec. We do this even if are
-- not generating code, since Lib-Writ uses this to determine which
-- units get written in the ali file.
Set_Generate_Code (Main_Unit);
-- If we have a corresponding spec, and it comes from source or it is
-- not a generated spec for a child subprogram body, then we need object
-- code for the spec unit as well.
if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
and then not Acts_As_Spec (Main_Unit_Node)
then
if Nkind (Unit (Main_Unit_Node)) = N_Subprogram_Body
and then not Comes_From_Source (Library_Unit (Main_Unit_Node))
then
null;
else
Set_Generate_Code
(Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
end if;
end if;
-- Case of no code required to be generated, exit indicating no error
if Original_Operating_Mode = Check_Syntax then
Treepr.Tree_Dump;
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Tree_Gen;
Namet.Finalize;
Check_Rep_Info;
-- Use a goto instead of calling Exit_Program so that finalization
-- occurs normally.
goto End_Of_Program;
elsif Original_Operating_Mode = Check_Semantics then
Back_End_Mode := Declarations_Only;
-- All remaining cases are cases in which the user requested that code
-- be generated (i.e. no -gnatc or -gnats switch was used). Check if we
-- can in fact satisfy this request.
-- Cannot generate code if someone has turned off code generation for
-- any reason at all. We will try to figure out a reason below.
elsif Operating_Mode /= Generate_Code then
Back_End_Mode := Skip;
-- We can generate code for a subprogram body unless there were missing
-- subunits. Note that we always generate code for all generic units (a
-- change from some previous versions of GNAT).
elsif Main_Kind = N_Subprogram_Body and then not Subunits_Missing then
Back_End_Mode := Generate_Object;
-- We can generate code for a package body unless there are subunits
-- missing (note that we always generate code for generic units, which
-- is a change from some earlier versions of GNAT).
elsif Main_Kind = N_Package_Body and then not Subunits_Missing then
Back_End_Mode := Generate_Object;
-- We can generate code for a package declaration or a subprogram
-- declaration only if it does not required a body.
elsif Nkind_In (Main_Kind,
N_Package_Declaration,
N_Subprogram_Declaration)
and then
(not Body_Required (Main_Unit_Node)
or else
Distribution_Stub_Mode = Generate_Caller_Stub_Body)
then
Back_End_Mode := Generate_Object;
-- We can generate code for a generic package declaration of a generic
-- subprogram declaration only if does not require a body.
elsif Nkind_In (Main_Kind, N_Generic_Package_Declaration,
N_Generic_Subprogram_Declaration)
and then not Body_Required (Main_Unit_Node)
then
Back_End_Mode := Generate_Object;
-- Compilation units that are renamings do not require bodies, so we can
-- generate code for them.
elsif Nkind_In (Main_Kind, N_Package_Renaming_Declaration,
N_Subprogram_Renaming_Declaration)
then
Back_End_Mode := Generate_Object;
-- Compilation units that are generic renamings do not require bodies
-- so we can generate code for them.
elsif Main_Kind in N_Generic_Renaming_Declaration then
Back_End_Mode := Generate_Object;
-- It's not an error to generate SCIL for e.g. a spec which has a body
elsif CodePeer_Mode then
Back_End_Mode := Generate_Object;
-- In all other cases (specs which have bodies, generics, and bodies
-- where subunits are missing), we cannot generate code and we generate
-- a warning message. Note that generic instantiations are gone at this
-- stage since they have been replaced by their instances.
else
Back_End_Mode := Skip;
end if;
-- At this stage Back_End_Mode is set to indicate if the backend should
-- be called to generate code. If it is Skip, then code generation has
-- been turned off, even though code was requested by the original
-- command. This is not an error from the user point of view, but it is
-- an error from the point of view of the gcc driver, so we must exit
-- with an error status.
-- We generate an informative message (from the gcc point of view, it
-- is an error message, but from the users point of view this is not an
-- error, just a consequence of compiling something that cannot
-- generate code).
if Back_End_Mode = Skip then
Set_Standard_Error;
Write_Str ("cannot generate code for ");
Write_Str ("file ");
Write_Name (Unit_File_Name (Main_Unit));
if Subunits_Missing then
Write_Str (" (missing subunits)");
Write_Eol;
-- Force generation of ALI file, for backward compatibility
Opt.Force_ALI_Tree_File := True;
elsif Main_Kind = N_Subunit then
Write_Str (" (subunit)");
Write_Eol;
-- Force generation of ALI file, for backward compatibility
Opt.Force_ALI_Tree_File := True;
elsif Main_Kind = N_Subprogram_Declaration then
Write_Str (" (subprogram spec)");
Write_Eol;
-- Generic package body in GNAT implementation mode
elsif Main_Kind = N_Package_Body and then GNAT_Mode then
Write_Str (" (predefined generic)");
Write_Eol;
-- Force generation of ALI file, for backward compatibility
Opt.Force_ALI_Tree_File := True;
-- Only other case is a package spec
else
Write_Str (" (package spec)");
Write_Eol;
end if;
Set_Standard_Output;
Sem_Ch13.Validate_Unchecked_Conversions;
Sem_Ch13.Validate_Address_Clauses;
Sem_Ch13.Validate_Independence;
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Treepr.Tree_Dump;
Tree_Gen;
-- Generate ALI file if specially requested, or for missing subunits,
-- subunits or predefined generic.
if Opt.Force_ALI_Tree_File then
Write_ALI (Object => False);
end if;
Namet.Finalize;
Check_Rep_Info;
-- Exit program with error indication, to kill object file
Exit_Program (E_No_Code);
end if;
-- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also set
-- as indicated by Back_Annotate_Rep_Info being set to True.
-- We don't call for annotations on a subunit, because to process those
-- the back-end requires that the parent(s) be properly compiled.
-- Annotation is suppressed for targets where front-end layout is
-- enabled, because the front end determines representations.
-- Annotation is also suppressed in the case of compiling for a VM,
-- since representations are largely symbolic there.
if Back_End_Mode = Declarations_Only
and then (not (Back_Annotate_Rep_Info or Generate_SCIL)
or else Main_Kind = N_Subunit
or else Targparm.Frontend_Layout_On_Target
or else Targparm.VM_Target /= No_VM)
then
Sem_Ch13.Validate_Unchecked_Conversions;
Sem_Ch13.Validate_Address_Clauses;
Sem_Ch13.Validate_Independence;
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Write_ALI (Object => False);
Tree_Dump;
Tree_Gen;
Namet.Finalize;
Check_Rep_Info;
return;
end if;
-- Ensure that we properly register a dependency on system.ads, since
-- even if we do not semantically depend on this, Targparm has read
-- system parameters from the system.ads file.
Lib.Writ.Ensure_System_Dependency;
-- Add dependencies, if any, on preprocessing data file and on
-- preprocessing definition file(s).
Prepcomp.Add_Dependencies;
-- Back end needs to explicitly unlock tables it needs to touch
Atree.Lock;
Elists.Lock;
Fname.UF.Lock;
Inline.Lock;
Lib.Lock;
Nlists.Lock;
Sem.Lock;
Sinput.Lock;
Namet.Lock;
Stringt.Lock;
-- ???Check_Library_Items under control of a debug flag, because it
-- currently does not work if the -gnatn switch (back end inlining) is
-- used.
if Debug_Flag_Dot_WW then
Check_Library_Items;
end if;
-- Here we call the back end to generate the output code
Generating_Code := True;
Back_End.Call_Back_End (Back_End_Mode);
-- Once the backend is complete, we unlock the names table. This call
-- allows a few extra entries, needed for example for the file name for
-- the library file output.
Namet.Unlock;
-- Generate the call-graph output of dispatching calls
Exp_CG.Generate_CG_Output;
-- Validate unchecked conversions (using the values for size and
-- alignment annotated by the backend where possible).
Sem_Ch13.Validate_Unchecked_Conversions;
-- Validate address clauses (again using alignment values annotated
-- by the backend where possible).
Sem_Ch13.Validate_Address_Clauses;
-- Validate independence pragmas (again using values annotated by
-- the back end for component layout etc.)
Sem_Ch13.Validate_Independence;
-- Now we complete output of errors, rep info and the tree info. These
-- are delayed till now, since it is perfectly possible for gigi to
-- generate errors, modify the tree (in particular by setting flags
-- indicating that elaboration is required, and also to back annotate
-- representation information for List_Rep_Info.
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
List_Rep_Info;
-- Only write the library if the backend did not generate any error
-- messages. Otherwise signal errors to the driver program so that
-- there will be no attempt to generate an object file.
if Compilation_Errors then
Treepr.Tree_Dump;
Exit_Program (E_Errors);
end if;
Write_ALI (Object => (Back_End_Mode = Generate_Object));
-- Generate ASIS tree after writing the ALI file, since in ASIS mode,
-- Write_ALI may in fact result in further tree decoration from the
-- original tree file. Note that we dump the tree just before generating
-- it, so that the dump will exactly reflect what is written out.
Treepr.Tree_Dump;
Tree_Gen;
-- Finalize name table and we are all done
Namet.Finalize;
exception
-- Handle fatal internal compiler errors
when Rtsfind.RE_Not_Available =>
Comperr.Compiler_Abort ("RE_Not_Available");
when System.Assertions.Assert_Failure =>
Comperr.Compiler_Abort ("Assert_Failure");
when Constraint_Error =>
Comperr.Compiler_Abort ("Constraint_Error");
when Program_Error =>
Comperr.Compiler_Abort ("Program_Error");
when Storage_Error =>
-- Assume this is a bug. If it is real, the message will in any case
-- say Storage_Error, giving a strong hint!
Comperr.Compiler_Abort ("Storage_Error");
end;
<<End_Of_Program>>
null;
-- The outer exception handles an unrecoverable error
exception
when Unrecoverable_Error =>
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Set_Standard_Error;
Write_Str ("compilation abandoned");
Write_Eol;
Set_Standard_Output;
Source_Dump;
Tree_Dump;
Exit_Program (E_Errors);
end Gnat1drv;