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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- L I B . L O A D --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1992-2007, 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 Debug; use Debug;
+with Einfo; use Einfo;
+with Errout; use Errout;
+with Fname; use Fname;
+with Fname.UF; use Fname.UF;
+with Nlists; use Nlists;
+with Nmake; use Nmake;
+with Opt; use Opt;
+with Osint; use Osint;
+with Osint.C; use Osint.C;
+with Output; use Output;
+with Par;
+with Restrict; use Restrict;
+with Scn; use Scn;
+with Sinfo; use Sinfo;
+with Sinput; use Sinput;
+with Sinput.L; use Sinput.L;
+with Stand; use Stand;
+with Tbuild; use Tbuild;
+with Uname; use Uname;
+
+package body Lib.Load is
+
+ -----------------------
+ -- Local Subprograms --
+ -----------------------
+
+ function From_Limited_With_Chain return Boolean;
+ -- Check whether a possible circular dependence includes units that
+ -- have been loaded through limited_with clauses, in which case there
+ -- is no real circularity.
+
+ function Spec_Is_Irrelevant
+ (Spec_Unit : Unit_Number_Type;
+ Body_Unit : Unit_Number_Type) return Boolean;
+ -- The Spec_Unit and Body_Unit parameters are the unit numbers of the
+ -- spec file that corresponds to the main unit which is a body. This
+ -- function determines if the spec file is irrelevant and will be
+ -- overridden by the body as described in RM 10.1.4(4). See description
+ -- in "Special Handling of Subprogram Bodies" for further details.
+
+ procedure Write_Dependency_Chain;
+ -- This procedure is used to generate error message info lines that
+ -- trace the current dependency chain when a load error occurs.
+
+ ------------------------------
+ -- Change_Main_Unit_To_Spec --
+ ------------------------------
+
+ procedure Change_Main_Unit_To_Spec is
+ U : Unit_Record renames Units.Table (Main_Unit);
+ N : File_Name_Type;
+ X : Source_File_Index;
+
+ begin
+ -- Get name of unit body
+
+ Get_Name_String (U.Unit_File_Name);
+
+ -- Note: for the following we should really generalize and consult the
+ -- file name pattern data, but for now we just deal with the common
+ -- naming cases, which is probably good enough in practice ???
+
+ -- Change .adb to .ads
+
+ if Name_Len >= 5
+ and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".adb"
+ then
+ Name_Buffer (Name_Len) := 's';
+
+ -- Change .2.ada to .1.ada (Rational convention)
+
+ elsif Name_Len >= 7
+ and then Name_Buffer (Name_Len - 5 .. Name_Len) = ".2.ada"
+ then
+ Name_Buffer (Name_Len - 4) := '1';
+
+ -- Change .ada to _.ada (DEC convention)
+
+ elsif Name_Len >= 5
+ and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".ada"
+ then
+ Name_Buffer (Name_Len - 3 .. Name_Len + 1) := "_.ada";
+ Name_Len := Name_Len + 1;
+
+ -- No match, don't make the change
+
+ else
+ return;
+ end if;
+
+ -- Try loading the spec
+
+ N := Name_Find;
+ X := Load_Source_File (N);
+
+ -- No change if we did not find the spec
+
+ if X = No_Source_File then
+ return;
+ end if;
+
+ -- Otherwise modify Main_Unit entry to point to spec
+
+ U.Unit_File_Name := N;
+ U.Source_Index := X;
+ end Change_Main_Unit_To_Spec;
+
+ -------------------------------
+ -- Create_Dummy_Package_Unit --
+ -------------------------------
+
+ function Create_Dummy_Package_Unit
+ (With_Node : Node_Id;
+ Spec_Name : Unit_Name_Type) return Unit_Number_Type
+ is
+ Unum : Unit_Number_Type;
+ Cunit_Entity : Entity_Id;
+ Cunit : Node_Id;
+ Du_Name : Node_Or_Entity_Id;
+ End_Lab : Node_Id;
+ Save_CS : constant Boolean := Get_Comes_From_Source_Default;
+
+ begin
+ -- The created dummy package unit does not come from source
+
+ Set_Comes_From_Source_Default (False);
+
+ -- Normal package
+
+ if Nkind (Name (With_Node)) = N_Identifier then
+ Cunit_Entity :=
+ Make_Defining_Identifier (No_Location,
+ Chars => Chars (Name (With_Node)));
+ Du_Name := Cunit_Entity;
+ End_Lab := New_Occurrence_Of (Cunit_Entity, No_Location);
+
+ -- Child package
+
+ else
+ Cunit_Entity :=
+ Make_Defining_Identifier (No_Location,
+ Chars => Chars (Selector_Name (Name (With_Node))));
+ Du_Name :=
+ Make_Defining_Program_Unit_Name (No_Location,
+ Name => New_Copy_Tree (Prefix (Name (With_Node))),
+ Defining_Identifier => Cunit_Entity);
+
+ Set_Is_Child_Unit (Cunit_Entity);
+
+ End_Lab :=
+ Make_Designator (No_Location,
+ Name => New_Copy_Tree (Prefix (Name (With_Node))),
+ Identifier => New_Occurrence_Of (Cunit_Entity, No_Location));
+ end if;
+
+ Set_Scope (Cunit_Entity, Standard_Standard);
+
+ Cunit :=
+ Make_Compilation_Unit (No_Location,
+ Context_Items => Empty_List,
+ Unit =>
+ Make_Package_Declaration (No_Location,
+ Specification =>
+ Make_Package_Specification (No_Location,
+ Defining_Unit_Name => Du_Name,
+ Visible_Declarations => Empty_List,
+ End_Label => End_Lab)),
+ Aux_Decls_Node =>
+ Make_Compilation_Unit_Aux (No_Location));
+
+ -- Mark the dummy package as analyzed to prevent analysis of this
+ -- (non-existent) unit in -gnatQ mode because at the moment the
+ -- structure and attributes of this dummy package does not allow
+ -- a normal analysis of this unit
+
+ Set_Analyzed (Cunit);
+
+ Units.Increment_Last;
+ Unum := Units.Last;
+
+ Units.Table (Unum) := (
+ Cunit => Cunit,
+ Cunit_Entity => Cunit_Entity,
+ Dependency_Num => 0,
+ Dynamic_Elab => False,
+ Error_Location => Sloc (With_Node),
+ Expected_Unit => Spec_Name,
+ Fatal_Error => True,
+ Generate_Code => False,
+ Has_RACW => False,
+ Is_Compiler_Unit => False,
+ Ident_String => Empty,
+ Loading => False,
+ Main_Priority => Default_Main_Priority,
+ Munit_Index => 0,
+ Serial_Number => 0,
+ Source_Index => No_Source_File,
+ Unit_File_Name => Get_File_Name (Spec_Name, Subunit => False),
+ Unit_Name => Spec_Name,
+ Version => 0);
+
+ Set_Comes_From_Source_Default (Save_CS);
+ Set_Error_Posted (Cunit_Entity);
+ Set_Error_Posted (Cunit);
+ return Unum;
+ end Create_Dummy_Package_Unit;
+
+ -----------------------------
+ -- From_Limited_With_Chain --
+ -----------------------------
+
+ function From_Limited_With_Chain return Boolean is
+ Curr_Num : constant Unit_Number_Type :=
+ Load_Stack.Table (Load_Stack.Last).Unit_Number;
+
+ begin
+ -- True if the current load operation is through a limited_with clause
+ -- and we are not within a loop of regular with_clauses.
+
+ for U in reverse Load_Stack.First .. Load_Stack.Last - 1 loop
+ if Load_Stack.Table (U).Unit_Number = Curr_Num then
+ return False;
+
+ elsif Present (Load_Stack.Table (U).With_Node)
+ and then Limited_Present (Load_Stack.Table (U).With_Node)
+ then
+ return True;
+ end if;
+ end loop;
+
+ return False;
+ end From_Limited_With_Chain;
+
+ ----------------
+ -- Initialize --
+ ----------------
+
+ procedure Initialize is
+ begin
+ Units.Init;
+ Load_Stack.Init;
+ end Initialize;
+
+ ------------------------
+ -- Initialize_Version --
+ ------------------------
+
+ procedure Initialize_Version (U : Unit_Number_Type) is
+ begin
+ Units.Table (U).Version := Source_Checksum (Source_Index (U));
+ end Initialize_Version;
+
+ ----------------------
+ -- Load_Main_Source --
+ ----------------------
+
+ procedure Load_Main_Source is
+ Fname : File_Name_Type;
+ Version : Word := 0;
+
+ begin
+ Load_Stack.Increment_Last;
+ Load_Stack.Table (Load_Stack.Last) := (Main_Unit, Empty);
+
+ -- Initialize unit table entry for Main_Unit. Note that we don't know
+ -- the unit name yet, that gets filled in when the parser parses the
+ -- main unit, at which time a check is made that it matches the main
+ -- file name, and then the Unit_Name field is set. The Cunit and
+ -- Cunit_Entity fields also get filled in later by the parser.
+
+ Units.Increment_Last;
+ Fname := Next_Main_Source;
+
+ Units.Table (Main_Unit).Unit_File_Name := Fname;
+
+ if Fname /= No_File then
+ Main_Source_File := Load_Source_File (Fname);
+ Current_Error_Source_File := Main_Source_File;
+
+ if Main_Source_File /= No_Source_File then
+ Version := Source_Checksum (Main_Source_File);
+ end if;
+
+ Units.Table (Main_Unit) := (
+ Cunit => Empty,
+ Cunit_Entity => Empty,
+ Dependency_Num => 0,
+ Dynamic_Elab => False,
+ Error_Location => No_Location,
+ Expected_Unit => No_Unit_Name,
+ Fatal_Error => False,
+ Generate_Code => False,
+ Has_RACW => False,
+ Is_Compiler_Unit => False,
+ Ident_String => Empty,
+ Loading => True,
+ Main_Priority => Default_Main_Priority,
+ Munit_Index => 0,
+ Serial_Number => 0,
+ Source_Index => Main_Source_File,
+ Unit_File_Name => Fname,
+ Unit_Name => No_Unit_Name,
+ Version => Version);
+ end if;
+ end Load_Main_Source;
+
+ ---------------
+ -- Load_Unit --
+ ---------------
+
+ function Load_Unit
+ (Load_Name : Unit_Name_Type;
+ Required : Boolean;
+ Error_Node : Node_Id;
+ Subunit : Boolean;
+ Corr_Body : Unit_Number_Type := No_Unit;
+ Renamings : Boolean := False;
+ With_Node : Node_Id := Empty) return Unit_Number_Type
+ is
+ Calling_Unit : Unit_Number_Type;
+ Uname_Actual : Unit_Name_Type;
+ Unum : Unit_Number_Type;
+ Unump : Unit_Number_Type;
+ Fname : File_Name_Type;
+ Src_Ind : Source_File_Index;
+
+ -- Start of processing for Load_Unit
+
+ begin
+ -- If renamings are allowed and we have a child unit name, then we
+ -- must first load the parent to deal with finding the real name.
+
+ if Renamings and then Is_Child_Name (Load_Name) then
+ Unump :=
+ Load_Unit
+ (Load_Name => Get_Parent_Spec_Name (Load_Name),
+ Required => Required,
+ Subunit => False,
+ Renamings => True,
+ Error_Node => Error_Node);
+
+ if Unump = No_Unit then
+ return No_Unit;
+ end if;
+
+ -- If parent is a renaming, then we use the renamed package as
+ -- the actual parent for the subsequent load operation.
+
+ if Nkind (Unit (Cunit (Unump))) = N_Package_Renaming_Declaration then
+ Uname_Actual :=
+ New_Child
+ (Load_Name, Get_Unit_Name (Name (Unit (Cunit (Unump)))));
+
+ -- Save the renaming entity, to establish its visibility when
+ -- installing the context. The implicit with is on this entity,
+ -- not on the package it renames.
+
+ if Nkind (Error_Node) = N_With_Clause
+ and then Nkind (Name (Error_Node)) = N_Selected_Component
+ then
+ declare
+ Par : Node_Id := Name (Error_Node);
+
+ begin
+ while Nkind (Par) = N_Selected_Component
+ and then Chars (Selector_Name (Par)) /=
+ Chars (Cunit_Entity (Unump))
+ loop
+ Par := Prefix (Par);
+ end loop;
+
+ -- Case of some intermediate parent is a renaming
+
+ if Nkind (Par) = N_Selected_Component then
+ Set_Entity (Selector_Name (Par), Cunit_Entity (Unump));
+
+ -- Case where the ultimate parent is a renaming
+
+ else
+ Set_Entity (Par, Cunit_Entity (Unump));
+ end if;
+ end;
+ end if;
+
+ -- If the parent is not a renaming, then get its name (this may
+ -- be different from the parent spec name obtained above because
+ -- of renamings higher up in the hierarchy).
+
+ else
+ Uname_Actual := New_Child (Load_Name, Unit_Name (Unump));
+ end if;
+
+ -- Here if unit to be loaded is not a child unit
+
+ else
+ Uname_Actual := Load_Name;
+ end if;
+
+ Fname := Get_File_Name (Uname_Actual, Subunit);
+
+ if Debug_Flag_L then
+ Write_Eol;
+ Write_Str ("*** Load request for unit: ");
+ Write_Unit_Name (Load_Name);
+
+ if Required then
+ Write_Str (" (Required = True)");
+ else
+ Write_Str (" (Required = False)");
+ end if;
+
+ Write_Eol;
+
+ if Uname_Actual /= Load_Name then
+ Write_Str ("*** Actual unit loaded: ");
+ Write_Unit_Name (Uname_Actual);
+ end if;
+ end if;
+
+ -- Capture error location if it is for the main unit. The idea is to
+ -- post errors on the main unit location, not the most recent unit.
+ -- Note: Unit_Name (Main_Unit) is not set if we are parsing gnat.adc.
+
+ if Present (Error_Node)
+ and then Unit_Name (Main_Unit) /= No_Unit_Name
+ then
+ -- It seems like In_Extended_Main_Source_Unit (Error_Node) would
+ -- do the trick here, but that's wrong, it is much too early to
+ -- call this routine. We are still in the parser, and the required
+ -- semantic information is not established yet. So we base the
+ -- judgment on unit names.
+
+ Get_External_Unit_Name_String (Unit_Name (Main_Unit));
+
+ declare
+ Main_Unit_Name : constant String := Name_Buffer (1 .. Name_Len);
+
+ begin
+ Get_External_Unit_Name_String
+ (Unit_Name (Get_Source_Unit (Error_Node)));
+
+ -- If the two names are identical, then for sure we are part
+ -- of the extended main unit
+
+ if Main_Unit_Name = Name_Buffer (1 .. Name_Len) then
+ Load_Msg_Sloc := Sloc (Error_Node);
+
+ -- If the load is called from a with_type clause, the error
+ -- node is correct.
+
+ -- Otherwise, check for the subunit case, and if so, consider
+ -- we have a match if one name is a prefix of the other name.
+
+ else
+ if Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
+ or else
+ Nkind (Unit (Cunit (Get_Source_Unit (Error_Node)))) =
+ N_Subunit
+ then
+ Name_Len := Integer'Min (Name_Len, Main_Unit_Name'Length);
+
+ if Name_Buffer (1 .. Name_Len)
+ =
+ Main_Unit_Name (1 .. Name_Len)
+ then
+ Load_Msg_Sloc := Sloc (Error_Node);
+ end if;
+ end if;
+ end if;
+ end;
+ end if;
+
+ -- If we are generating error messages, then capture calling unit
+
+ if Present (Error_Node) then
+ Calling_Unit := Get_Source_Unit (Error_Node);
+ else
+ Calling_Unit := No_Unit;
+ end if;
+
+ -- See if we already have an entry for this unit
+
+ Unum := Main_Unit;
+
+ while Unum <= Units.Last loop
+ exit when Uname_Actual = Units.Table (Unum).Unit_Name;
+ Unum := Unum + 1;
+ end loop;
+
+ -- Whether or not the entry was found, Unum is now the right value,
+ -- since it is one more than Units.Last (i.e. the index of the new
+ -- entry we will create) in the not found case.
+
+ -- A special check is necessary in the unit not found case. If the unit
+ -- is not found, but the file in which it lives has already been loaded,
+ -- then we have the problem that the file does not contain the unit that
+ -- is needed. We simply treat this as a file not found condition.
+
+ -- We skip this test in multiple unit per file mode since in this
+ -- case we can have multiple units from the same source file.
+
+ if Unum > Units.Last and then Get_Unit_Index (Uname_Actual) = 0 then
+ for J in Units.First .. Units.Last loop
+ if Fname = Units.Table (J).Unit_File_Name then
+ if Debug_Flag_L then
+ Write_Str (" file does not contain unit, Unit_Number = ");
+ Write_Int (Int (Unum));
+ Write_Eol;
+ Write_Eol;
+ end if;
+
+ if Present (Error_Node) then
+ if Is_Predefined_File_Name (Fname) then
+ Error_Msg_Unit_1 := Uname_Actual;
+ Error_Msg
+ ("$$ is not a language defined unit", Load_Msg_Sloc);
+ else
+ Error_Msg_File_1 := Fname;
+ Error_Msg_Unit_1 := Uname_Actual;
+ Error_Msg ("File{ does not contain unit$", Load_Msg_Sloc);
+ end if;
+
+ Write_Dependency_Chain;
+ return No_Unit;
+
+ else
+ return No_Unit;
+ end if;
+ end if;
+ end loop;
+ end if;
+
+ -- If we are proceeding with load, then make load stack entry,
+ -- and indicate the kind of with_clause responsible for the load.
+
+ Load_Stack.Increment_Last;
+ Load_Stack.Table (Load_Stack.Last) := (Unum, With_Node);
+
+ -- Case of entry already in table
+
+ if Unum <= Units.Last then
+
+ -- Here is where we check for a circular dependency, which is
+ -- an attempt to load a unit which is currently in the process
+ -- of being loaded. We do *not* care about a circular chain that
+ -- leads back to a body, because this kind of circular dependence
+ -- legitimately occurs (e.g. two package bodies that contain
+ -- inlined subprogram referenced by the other).
+
+ -- Ada 2005 (AI-50217): We also ignore limited_with clauses, because
+ -- their purpose is precisely to create legal circular structures.
+
+ if Loading (Unum)
+ and then (Is_Spec_Name (Units.Table (Unum).Unit_Name)
+ or else Acts_As_Spec (Units.Table (Unum).Cunit))
+ and then (Nkind (Error_Node) /= N_With_Clause
+ or else not Limited_Present (Error_Node))
+ and then not From_Limited_With_Chain
+ then
+ if Debug_Flag_L then
+ Write_Str (" circular dependency encountered");
+ Write_Eol;
+ end if;
+
+ if Present (Error_Node) then
+ Error_Msg ("circular unit dependency", Load_Msg_Sloc);
+ Write_Dependency_Chain;
+ else
+ Load_Stack.Decrement_Last;
+ end if;
+
+ return No_Unit;
+ end if;
+
+ if Debug_Flag_L then
+ Write_Str (" unit already in file table, Unit_Number = ");
+ Write_Int (Int (Unum));
+ Write_Eol;
+ end if;
+
+ Load_Stack.Decrement_Last;
+ return Unum;
+
+ -- Unit is not already in table, so try to open the file
+
+ else
+ if Debug_Flag_L then
+ Write_Str (" attempt unit load, Unit_Number = ");
+ Write_Int (Int (Unum));
+ Write_Eol;
+ end if;
+
+ Src_Ind := Load_Source_File (Fname);
+
+ -- Make a partial entry in the file table, used even in the file not
+ -- found case to print the dependency chain including the last entry
+
+ Units.Increment_Last;
+ Units.Table (Unum).Unit_Name := Uname_Actual;
+
+ -- File was found
+
+ if Src_Ind /= No_Source_File then
+ Units.Table (Unum) := (
+ Cunit => Empty,
+ Cunit_Entity => Empty,
+ Dependency_Num => 0,
+ Dynamic_Elab => False,
+ Error_Location => Sloc (Error_Node),
+ Expected_Unit => Uname_Actual,
+ Fatal_Error => False,
+ Generate_Code => False,
+ Has_RACW => False,
+ Is_Compiler_Unit => False,
+ Ident_String => Empty,
+ Loading => True,
+ Main_Priority => Default_Main_Priority,
+ Munit_Index => 0,
+ Serial_Number => 0,
+ Source_Index => Src_Ind,
+ Unit_File_Name => Fname,
+ Unit_Name => Uname_Actual,
+ Version => Source_Checksum (Src_Ind));
+
+ -- Parse the new unit
+
+ declare
+ Save_Index : constant Nat := Multiple_Unit_Index;
+ begin
+ Multiple_Unit_Index := Get_Unit_Index (Uname_Actual);
+ Units.Table (Unum).Munit_Index := Multiple_Unit_Index;
+ Initialize_Scanner (Unum, Source_Index (Unum));
+ Discard_List (Par (Configuration_Pragmas => False));
+ Multiple_Unit_Index := Save_Index;
+ Set_Loading (Unum, False);
+ end;
+
+ -- If spec is irrelevant, then post errors and quit
+
+ if Corr_Body /= No_Unit
+ and then Spec_Is_Irrelevant (Unum, Corr_Body)
+ then
+ Error_Msg_File_1 := Unit_File_Name (Corr_Body);
+ Error_Msg
+ ("cannot compile subprogram in file {!", Load_Msg_Sloc);
+ Error_Msg_File_1 := Unit_File_Name (Unum);
+ Error_Msg
+ ("\incorrect spec in file { must be removed first!",
+ Load_Msg_Sloc);
+ return No_Unit;
+ end if;
+
+ -- If loaded unit had a fatal error, then caller inherits it!
+
+ if Units.Table (Unum).Fatal_Error
+ and then Present (Error_Node)
+ then
+ Units.Table (Calling_Unit).Fatal_Error := True;
+ end if;
+
+ -- Remove load stack entry and return the entry in the file table
+
+ Load_Stack.Decrement_Last;
+ return Unum;
+
+ -- Case of file not found
+
+ else
+ if Debug_Flag_L then
+ Write_Str (" file was not found, load failed");
+ Write_Eol;
+ end if;
+
+ -- Generate message if unit required
+
+ if Required and then Present (Error_Node) then
+ if Is_Predefined_File_Name (Fname) then
+
+ -- This is a predefined library unit which is not present
+ -- in the run time. If a predefined unit is not available
+ -- it may very likely be the case that there is also pragma
+ -- Restriction forbidding its usage. This is typically the
+ -- case when building a configurable run time, where the
+ -- usage of certain run-time units units is restricted by
+ -- means of both the corresponding pragma Restriction (such
+ -- as No_Calendar), and by not including the unit. Hence,
+ -- we check whether this predefined unit is forbidden, so
+ -- that the message about the restriction violation is
+ -- generated, if needed.
+
+ Check_Restricted_Unit (Load_Name, Error_Node);
+
+ Error_Msg_Unit_1 := Uname_Actual;
+ Error_Msg
+ ("$$ is not a predefined library unit", Load_Msg_Sloc);
+
+ else
+ Error_Msg_File_1 := Fname;
+ Error_Msg ("file{ not found", Load_Msg_Sloc);
+ end if;
+
+ Write_Dependency_Chain;
+
+ -- Remove unit from stack, to avoid cascaded errors on
+ -- subsequent missing files.
+
+ Load_Stack.Decrement_Last;
+ Units.Decrement_Last;
+
+ -- If unit not required, remove load stack entry and the junk
+ -- file table entry, and return No_Unit to indicate not found,
+
+ else
+ Load_Stack.Decrement_Last;
+ Units.Decrement_Last;
+ end if;
+
+ return No_Unit;
+ end if;
+ end if;
+ end Load_Unit;
+
+ ------------------------
+ -- Make_Instance_Unit --
+ ------------------------
+
+ -- If the unit is an instance, it appears as a package declaration, but
+ -- contains both declaration and body of the instance. The body becomes
+ -- the main unit of the compilation, and the declaration is inserted
+ -- at the end of the unit table. The main unit now has the name of a
+ -- body, which is constructed from the name of the original spec,
+ -- and is attached to the compilation node of the original unit. The
+ -- declaration has been attached to a new compilation unit node, and
+ -- code will have to be generated for it.
+
+ procedure Make_Instance_Unit (N : Node_Id) is
+ Sind : constant Source_File_Index := Source_Index (Main_Unit);
+ begin
+ Units.Increment_Last;
+ Units.Table (Units.Last) := Units.Table (Main_Unit);
+ Units.Table (Units.Last).Cunit := Library_Unit (N);
+ Units.Table (Units.Last).Generate_Code := True;
+ Units.Table (Main_Unit).Cunit := N;
+ Units.Table (Main_Unit).Unit_Name :=
+ Get_Body_Name (Unit_Name (Get_Cunit_Unit_Number (Library_Unit (N))));
+ Units.Table (Main_Unit).Version := Source_Checksum (Sind);
+ end Make_Instance_Unit;
+
+ ------------------------
+ -- Spec_Is_Irrelevant --
+ ------------------------
+
+ function Spec_Is_Irrelevant
+ (Spec_Unit : Unit_Number_Type;
+ Body_Unit : Unit_Number_Type) return Boolean
+ is
+ Sunit : constant Node_Id := Cunit (Spec_Unit);
+ Bunit : constant Node_Id := Cunit (Body_Unit);
+
+ begin
+ -- The spec is irrelevant if the body is a subprogram body, and the
+ -- spec is other than a subprogram spec or generic subprogram spec.
+ -- Note that the names must be the same, we don't need to check that,
+ -- because we already know that from the fact that the file names are
+ -- the same.
+
+ return
+ Nkind (Unit (Bunit)) = N_Subprogram_Body
+ and then Nkind (Unit (Sunit)) /= N_Subprogram_Declaration
+ and then Nkind (Unit (Sunit)) /= N_Generic_Subprogram_Declaration;
+ end Spec_Is_Irrelevant;
+
+ --------------------
+ -- Version_Update --
+ --------------------
+
+ procedure Version_Update (U : Node_Id; From : Node_Id) is
+ Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (U);
+ Fnum : constant Unit_Number_Type := Get_Cunit_Unit_Number (From);
+ begin
+ if Source_Index (Fnum) /= No_Source_File then
+ Units.Table (Unum).Version :=
+ Units.Table (Unum).Version
+ xor
+ Source_Checksum (Source_Index (Fnum));
+ end if;
+ end Version_Update;
+
+ ----------------------------
+ -- Write_Dependency_Chain --
+ ----------------------------
+
+ procedure Write_Dependency_Chain is
+ begin
+ -- The dependency chain is only written if it is at least two entries
+ -- deep, otherwise it is trivial (the main unit depending on a unit
+ -- that it obviously directly depends on).
+
+ if Load_Stack.Last - 1 > Load_Stack.First then
+ for U in Load_Stack.First .. Load_Stack.Last - 1 loop
+ Error_Msg_Unit_1 :=
+ Unit_Name (Load_Stack.Table (U).Unit_Number);
+ Error_Msg_Unit_2 :=
+ Unit_Name (Load_Stack.Table (U + 1).Unit_Number);
+ Error_Msg ("$ depends on $!", Load_Msg_Sloc);
+ end loop;
+ end if;
+ end Write_Dependency_Chain;
+
+end Lib.Load;