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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- P A R . L O A D --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2019, 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. --
-- --
------------------------------------------------------------------------------
-- The Par.Load procedure loads all units that are definitely required before
-- it makes any sense at all to proceed with semantic analysis, including
-- with'ed units, corresponding specs for bodies, parents of child specs,
-- and parents of subunits. All these units are loaded and pointers installed
-- in the tree as described in the spec of package Lib.
with Fname.UF; use Fname.UF;
with Lib.Load; use Lib.Load;
with Namet.Sp; use Namet.Sp;
with Uname; use Uname;
with Osint; use Osint;
with Sinput.L; use Sinput.L;
with Stylesw; use Stylesw;
with GNAT.Spelling_Checker; use GNAT.Spelling_Checker;
separate (Par)
procedure Load is
File_Name : File_Name_Type;
-- Name of file for current unit, derived from unit name
Cur_Unum : constant Unit_Number_Type := Current_Source_Unit;
-- Unit number of unit that we just finished parsing. Note that we need
-- to capture this, because Source_Unit will change as we parse new
-- source files in the multiple main source file case.
Curunit : constant Node_Id := Cunit (Cur_Unum);
-- Compilation unit node for current compilation unit
Loc : Source_Ptr := Sloc (Curunit);
-- Source location for compilation unit node
Save_Style_Check : Boolean;
Save_Style_Checks : Style_Check_Options;
-- Save style check so it can be restored later
With_Cunit : Node_Id;
-- Compilation unit node for withed unit
Context_Node : Node_Id;
-- Next node in context items list
With_Node : Node_Id;
-- N_With_Clause node
Spec_Name : Unit_Name_Type;
-- Unit name of required spec
Body_Name : Unit_Name_Type;
-- Unit name of corresponding body
Unum : Unit_Number_Type;
-- Unit number of loaded unit
Limited_With_Found : Boolean := False;
-- We load the context items in two rounds: the first round handles normal
-- withed units and the second round handles Ada 2005 limited-withed units.
-- This is required to allow the low-level circuitry that detects circular
-- dependencies of units the correct notification of errors (see comment
-- bellow). This variable is used to indicate that the second round is
-- required.
function Same_File_Name_Except_For_Case
(Expected_File_Name : File_Name_Type;
Actual_File_Name : File_Name_Type) return Boolean;
-- Given an actual file name and an expected file name (the latter being
-- derived from the unit name), determine if they are the same except for
-- possibly different casing of letters.
------------------------------------
-- Same_File_Name_Except_For_Case --
------------------------------------
function Same_File_Name_Except_For_Case
(Expected_File_Name : File_Name_Type;
Actual_File_Name : File_Name_Type) return Boolean
is
begin
Get_Name_String (Actual_File_Name);
Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
declare
Lower_Case_Actual_File_Name : String (1 .. Name_Len);
begin
Lower_Case_Actual_File_Name := Name_Buffer (1 .. Name_Len);
Get_Name_String (Expected_File_Name);
Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
return Lower_Case_Actual_File_Name = Name_Buffer (1 .. Name_Len);
end;
end Same_File_Name_Except_For_Case;
-- Start of processing for Load
begin
-- Don't do any loads if we already had a fatal error
if Fatal_Error (Cur_Unum) = Error_Detected then
return;
end if;
Save_Style_Check_Options (Save_Style_Checks);
Save_Style_Check := Opt.Style_Check;
-- If main unit, set Main_Unit_Entity (this will get overwritten if
-- the main unit has a separate spec, that happens later on in Load)
if Cur_Unum = Main_Unit then
Main_Unit_Entity := Cunit_Entity (Main_Unit);
end if;
-- If we have no unit name, things are seriously messed up by previous
-- errors, and we should not try to continue compilation.
if Unit_Name (Cur_Unum) = No_Unit_Name then
raise Unrecoverable_Error;
end if;
-- Next step, make sure that the unit name matches the file name
-- and issue a warning message if not. We only output this for the
-- main unit, since for other units it is more serious and is
-- caught in a separate test below. We also inhibit the message in
-- multiple unit per file mode, because in this case the relation
-- between file name and unit name is broken.
File_Name :=
Get_File_Name
(Unit_Name (Cur_Unum),
Subunit => Nkind (Unit (Cunit (Cur_Unum))) = N_Subunit);
if Cur_Unum = Main_Unit
and then Multiple_Unit_Index = 0
and then File_Name /= Unit_File_Name (Cur_Unum)
and then (File_Names_Case_Sensitive
or not Same_File_Name_Except_For_Case
(File_Name, Unit_File_Name (Cur_Unum)))
then
Error_Msg_File_1 := File_Name;
Error_Msg
("??file name does not match unit name, should be{", Sloc (Curunit));
end if;
-- For units other than the main unit, the expected unit name is set and
-- must be the same as the actual unit name, or we are in big trouble, and
-- abandon the compilation since there are situations where this really
-- gets us into bad trouble (e.g. some subunit situations).
if Cur_Unum /= Main_Unit
and then Expected_Unit (Cur_Unum) /= Unit_Name (Cur_Unum)
then
Loc := Error_Location (Cur_Unum);
Error_Msg_File_1 := Unit_File_Name (Cur_Unum);
Get_Name_String (Error_Msg_File_1);
-- Check for predefined file case
if Name_Len > 1
and then Name_Buffer (2) = '-'
and then (Name_Buffer (1) = 'a'
or else
Name_Buffer (1) = 's'
or else
Name_Buffer (1) = 'i'
or else
Name_Buffer (1) = 'g')
then
declare
Expect_Name : constant Unit_Name_Type := Expected_Unit (Cur_Unum);
Actual_Name : constant Unit_Name_Type := Unit_Name (Cur_Unum);
begin
Error_Msg_Unit_1 := Expect_Name;
Error_Msg -- CODEFIX
("$$ is not a predefined library unit!", Loc);
-- In the predefined file case, we know the user did not
-- construct their own package, but we got the wrong one.
-- This means that the name supplied by the user crunched
-- to something we recognized, but then the file did not
-- contain the unit expected. Most likely this is due to
-- a misspelling, e.g.
-- with Ada.Calender;
-- This crunches to a-calend, which indeed contains the unit
-- Ada.Calendar, and we can diagnose the misspelling. This
-- is a simple heuristic, but it catches many common cases
-- of misspelling of predefined unit names without needing
-- a full list of them.
-- Before actually issuing the message, we will check that the
-- unit name is indeed a plausible misspelling of the one we got.
if Is_Bad_Spelling_Of
(Name_Id (Expect_Name), Name_Id (Actual_Name))
then
Error_Msg_Unit_1 := Actual_Name;
Error_Msg -- CODEFIX
("possible misspelling of $$!", Loc);
end if;
end;
-- Non-predefined file name case. In this case we generate a message
-- and then we quit, because we are in big trouble, and if we try
-- to continue compilation, we get into some nasty situations
-- (for example in some subunit cases).
else
Error_Msg ("file { does not contain expected unit!", Loc);
Error_Msg_Unit_1 := Expected_Unit (Cur_Unum);
Error_Msg ("\\expected unit $!", Loc);
Error_Msg_Unit_1 := Unit_Name (Cur_Unum);
Error_Msg ("\\found unit $!", Loc);
end if;
-- In both cases, remove the unit if it is the last unit (which it
-- normally (always?) will be) so that it is out of the way later.
Remove_Unit (Cur_Unum);
end if;
-- If current unit is a body, load its corresponding spec
if Nkind (Unit (Curunit)) = N_Package_Body
or else Nkind (Unit (Curunit)) = N_Subprogram_Body
then
Spec_Name := Get_Spec_Name (Unit_Name (Cur_Unum));
Unum :=
Load_Unit
(Load_Name => Spec_Name,
Required => False,
Subunit => False,
Error_Node => Curunit,
Corr_Body => Cur_Unum,
PMES => (Cur_Unum = Main_Unit));
-- If we successfully load the unit, then set the spec/body pointers.
-- Once again note that if the loaded unit has a fatal error, Load will
-- have set our Fatal_Error flag to propagate this condition.
if Unum /= No_Unit then
Set_Library_Unit (Curunit, Cunit (Unum));
Set_Library_Unit (Cunit (Unum), Curunit);
-- If this is a separate spec for the main unit, then we reset
-- Main_Unit_Entity to point to the entity for this separate spec
-- and this is also where we generate the SCO's for this spec.
if Cur_Unum = Main_Unit then
Main_Unit_Entity := Cunit_Entity (Unum);
if Generate_SCO then
SCO_Record_Raw (Unum);
end if;
end if;
-- If we don't find the spec, then if we have a subprogram body, we
-- are still OK, we just have a case of a body acting as its own spec
elsif Nkind (Unit (Curunit)) = N_Subprogram_Body then
Set_Acts_As_Spec (Curunit, True);
Set_Library_Unit (Curunit, Curunit);
-- Otherwise we do have an error, repeat the load request for the spec
-- with Required set True to generate an appropriate error message.
else
Unum :=
Load_Unit
(Load_Name => Spec_Name,
Required => True,
Subunit => False,
Error_Node => Curunit);
return;
end if;
-- If current unit is a child unit spec, load its parent. If the child unit
-- is loaded through a limited with, the parent must be as well.
elsif Nkind (Unit (Curunit)) = N_Package_Declaration
or else Nkind (Unit (Curunit)) = N_Subprogram_Declaration
or else Nkind (Unit (Curunit)) in N_Generic_Declaration
or else Nkind (Unit (Curunit)) in N_Generic_Instantiation
or else Nkind (Unit (Curunit)) in N_Renaming_Declaration
then
-- Turn style checks off for parent unit
if not GNAT_Mode then
Reset_Style_Check_Options;
end if;
Spec_Name := Get_Parent_Spec_Name (Unit_Name (Cur_Unum));
if Spec_Name /= No_Unit_Name then
Unum :=
Load_Unit
(Load_Name => Spec_Name,
Required => True,
Subunit => False,
Error_Node => Curunit);
if Unum /= No_Unit then
Set_Parent_Spec (Unit (Curunit), Cunit (Unum));
end if;
end if;
-- If current unit is a subunit, then load its parent body
elsif Nkind (Unit (Curunit)) = N_Subunit then
Body_Name := Get_Parent_Body_Name (Unit_Name (Cur_Unum));
Unum :=
Load_Unit
(Load_Name => Body_Name,
Required => True,
Subunit => False,
Error_Node => Name (Unit (Curunit)));
if Unum /= No_Unit then
Set_Library_Unit (Curunit, Cunit (Unum));
end if;
end if;
-- Now we load with'ed units, with style checks turned off
if not GNAT_Mode then
Reset_Style_Check_Options;
end if;
-- Load the context items in two rounds: the first round handles normal
-- withed units and the second round handles Ada 2005 limited-withed units.
-- This is required to allow the low-level circuitry that detects circular
-- dependencies of units the correct notification of the following error:
-- limited with D;
-- with D; with C;
-- package C is ... package D is ...
for Round in 1 .. 2 loop
Context_Node := First (Context_Items (Curunit));
while Present (Context_Node) loop
-- During the first round we check if there is some limited-with
-- context clause; otherwise the second round will be skipped
if Nkind (Context_Node) = N_With_Clause
and then Round = 1
and then Limited_Present (Context_Node)
then
Limited_With_Found := True;
end if;
if Nkind (Context_Node) = N_With_Clause
and then ((Round = 1 and then not Limited_Present (Context_Node))
or else
(Round = 2 and then Limited_Present (Context_Node)))
then
With_Node := Context_Node;
Spec_Name := Get_Unit_Name (With_Node);
Unum :=
Load_Unit
(Load_Name => Spec_Name,
Required => False,
Subunit => False,
Error_Node => With_Node,
Renamings => True,
With_Node => Context_Node);
-- If we find the unit, then set spec pointer in the N_With_Clause
-- to point to the compilation unit for the spec. Remember that
-- the Load routine itself sets our Fatal_Error flag if the loaded
-- unit gets a fatal error, so we don't need to worry about that.
if Unum /= No_Unit then
Set_Library_Unit (With_Node, Cunit (Unum));
-- If the spec isn't found, then try finding the corresponding
-- body, since it is possible that we have a subprogram body
-- that is acting as a spec (since no spec is present).
else
Body_Name := Get_Body_Name (Spec_Name);
Unum :=
Load_Unit
(Load_Name => Body_Name,
Required => False,
Subunit => False,
Error_Node => With_Node,
Renamings => True);
-- If we got a subprogram body, then mark that we are using
-- the body as a spec in the file table, and set the spec
-- pointer in the N_With_Clause to point to the body entity.
if Unum /= No_Unit
and then Nkind (Unit (Cunit (Unum))) = N_Subprogram_Body
then
With_Cunit := Cunit (Unum);
Set_Library_Unit (With_Node, With_Cunit);
Set_Acts_As_Spec (With_Cunit, True);
Set_Library_Unit (With_Cunit, With_Cunit);
-- If we couldn't find the body, or if it wasn't a body spec
-- then we are in trouble. We make one more call to Load to
-- require the spec. We know it will fail of course, the
-- purpose is to generate the required error message (we prefer
-- that this message refer to the missing spec, not the body)
else
Unum :=
Load_Unit
(Load_Name => Spec_Name,
Required => True,
Subunit => False,
Error_Node => With_Node,
Renamings => True);
-- Here we create a dummy package unit for the missing unit
Unum := Create_Dummy_Package_Unit (With_Node, Spec_Name);
Set_Library_Unit (With_Node, Cunit (Unum));
end if;
end if;
end if;
Next (Context_Node);
end loop;
exit when not Limited_With_Found;
end loop;
-- Restore style/validity check mode for main unit
Set_Style_Check_Options (Save_Style_Checks);
Opt.Style_Check := Save_Style_Check;
end Load;