------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S E M _ D I S T -- -- -- -- B o d y -- -- -- -- -- -- Copyright (C) 1992-2001, 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 Atree; use Atree; with Casing; use Casing; with Einfo; use Einfo; with Errout; use Errout; with Exp_Dist; use Exp_Dist; with Exp_Tss; use Exp_Tss; with Nlists; use Nlists; with Nmake; use Nmake; with Namet; use Namet; with Opt; use Opt; with Rtsfind; use Rtsfind; with Sem; use Sem; with Sem_Res; use Sem_Res; with Sem_Util; use Sem_Util; with Sinfo; use Sinfo; with Snames; use Snames; with Stand; use Stand; with Stringt; use Stringt; with Tbuild; use Tbuild; with Uname; use Uname; package body Sem_Dist is ----------------------- -- Local Subprograms -- ----------------------- procedure RAS_E_Dereference (Pref : Node_Id); -- Handles explicit dereference of Remote Access to Subprograms. function Full_Qualified_Name (E : Entity_Id) return String_Id; -- returns the full qualified name of the entity in lower case. ------------------------- -- Add_Stub_Constructs -- ------------------------- procedure Add_Stub_Constructs (N : Node_Id) is U : constant Node_Id := Unit (N); Spec : Entity_Id := Empty; Exp : Node_Id := U; -- Unit that will be expanded begin pragma Assert (Distribution_Stub_Mode /= No_Stubs); if Nkind (U) = N_Package_Declaration then Spec := Defining_Entity (Specification (U)); elsif Nkind (U) = N_Package_Body then Spec := Corresponding_Spec (U); else pragma Assert (Nkind (U) = N_Package_Instantiation); Exp := Instance_Spec (U); Spec := Defining_Entity (Specification (Exp)); end if; pragma Assert (Is_Shared_Passive (Spec) or else Is_Remote_Call_Interface (Spec)); if Distribution_Stub_Mode = Generate_Caller_Stub_Body then if Is_Shared_Passive (Spec) then null; elsif Nkind (U) = N_Package_Body then Error_Msg_N ("Specification file expected from command line", U); else Expand_Calling_Stubs_Bodies (Exp); end if; else if Is_Shared_Passive (Spec) then Build_Passive_Partition_Stub (Exp); else Expand_Receiving_Stubs_Bodies (Exp); end if; end if; end Add_Stub_Constructs; ------------------------- -- Full_Qualified_Name -- ------------------------- function Full_Qualified_Name (E : Entity_Id) return String_Id is Ent : Entity_Id := E; Parent_Name : String_Id := No_String; begin -- Deals properly with child units if Nkind (Ent) = N_Defining_Program_Unit_Name then Ent := Defining_Identifier (Ent); end if; -- Compute recursively the qualification. Only "Standard" has no scope. if Present (Scope (Scope (Ent))) then Parent_Name := Full_Qualified_Name (Scope (Ent)); end if; -- Every entity should have a name except some expanded blocks -- don't bother about those. if Chars (Ent) = No_Name then return Parent_Name; end if; -- Add a period between Name and qualification if Parent_Name /= No_String then Start_String (Parent_Name); Store_String_Char (Get_Char_Code ('.')); else Start_String; end if; -- Generates the entity name in upper case Get_Name_String (Chars (Ent)); Set_Casing (All_Lower_Case); Store_String_Chars (Name_Buffer (1 .. Name_Len)); return End_String; end Full_Qualified_Name; ----------------------- -- Get_Subprogram_Id -- ----------------------- function Get_Subprogram_Id (E : Entity_Id) return Int is Current_Declaration : Node_Id; Result : Int := 0; begin pragma Assert (Is_Remote_Call_Interface (Scope (E)) and then (Nkind (Parent (E)) = N_Procedure_Specification or else Nkind (Parent (E)) = N_Function_Specification)); Current_Declaration := First (Visible_Declarations (Package_Specification_Of_Scope (Scope (E)))); while Current_Declaration /= Empty loop if Nkind (Current_Declaration) = N_Subprogram_Declaration and then Comes_From_Source (Current_Declaration) then if Defining_Unit_Name (Specification (Current_Declaration)) = E then return Result; end if; Result := Result + 1; end if; Next (Current_Declaration); end loop; -- Error if we do not find it raise Program_Error; end Get_Subprogram_Id; ------------------------ -- Is_All_Remote_Call -- ------------------------ function Is_All_Remote_Call (N : Node_Id) return Boolean is Par : Node_Id; begin if (Nkind (N) = N_Function_Call or else Nkind (N) = N_Procedure_Call_Statement) and then Nkind (Name (N)) in N_Has_Entity and then Is_Remote_Call_Interface (Entity (Name (N))) and then Has_All_Calls_Remote (Scope (Entity (Name (N)))) and then Comes_From_Source (N) then Par := Parent (Entity (Name (N))); while Present (Par) and then (Nkind (Par) /= N_Package_Specification or else Is_Wrapper_Package (Defining_Entity (Par))) loop Par := Parent (Par); end loop; if Present (Par) then return not Scope_Within_Or_Same (Current_Scope, Defining_Entity (Par)); else return False; end if; else return False; end if; end Is_All_Remote_Call; ------------------------------------ -- Package_Specification_Of_Scope -- ------------------------------------ function Package_Specification_Of_Scope (E : Entity_Id) return Node_Id is N : Node_Id := Parent (E); begin while Nkind (N) /= N_Package_Specification loop N := Parent (N); end loop; return N; end Package_Specification_Of_Scope; -------------------------- -- Process_Partition_ID -- -------------------------- procedure Process_Partition_Id (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); Ety : Entity_Id; Nd : Node_Id; Get_Pt_Id : Node_Id; Get_Pt_Id_Call : Node_Id; Prefix_String : String_Id; Typ : constant Entity_Id := Etype (N); begin Ety := Entity (Prefix (N)); -- In case prefix is not a library unit entity, get the entity -- of library unit. while (Present (Scope (Ety)) and then Scope (Ety) /= Standard_Standard) and not Is_Child_Unit (Ety) loop Ety := Scope (Ety); end loop; Nd := Enclosing_Lib_Unit_Node (N); -- Retrieve the proper function to call. if Is_Remote_Call_Interface (Ety) then Get_Pt_Id := New_Occurrence_Of (RTE (RE_Get_Active_Partition_Id), Loc); elsif Is_Shared_Passive (Ety) then Get_Pt_Id := New_Occurrence_Of (RTE (RE_Get_Passive_Partition_Id), Loc); else Get_Pt_Id := New_Occurrence_Of (RTE (RE_Get_Local_Partition_Id), Loc); end if; -- Get and store the String_Id corresponding to the name of the -- library unit whose Partition_Id is needed Get_Unit_Name_String (Get_Unit_Name (Unit_Declaration_Node (Ety))); -- Remove seven last character ("(spec)" or " (body)"). -- (this is a bit nasty, should have interface for this ???) Name_Len := Name_Len - 7; Start_String; Store_String_Chars (Name_Buffer (1 .. Name_Len)); Prefix_String := End_String; -- Build the function call which will replace the attribute if Is_Remote_Call_Interface (Ety) or else Is_Shared_Passive (Ety) then Get_Pt_Id_Call := Make_Function_Call (Loc, Name => Get_Pt_Id, Parameter_Associations => New_List (Make_String_Literal (Loc, Prefix_String))); else Get_Pt_Id_Call := Make_Function_Call (Loc, Get_Pt_Id); end if; -- Replace the attribute node by a conversion of the function call -- to the target type. Rewrite (N, Convert_To (Typ, Get_Pt_Id_Call)); Analyze_And_Resolve (N, Typ); end Process_Partition_Id; ---------------------------------- -- Process_Remote_AST_Attribute -- ---------------------------------- procedure Process_Remote_AST_Attribute (N : Node_Id; New_Type : Entity_Id) is Loc : constant Source_Ptr := Sloc (N); Remote_Subp : Entity_Id; Tick_Access_Conv_Call : Node_Id; Remote_Subp_Decl : Node_Id; RAS_Decl : Node_Id; RS_Pkg_Specif : Node_Id; RS_Pkg_E : Entity_Id; RAS_Pkg_E : Entity_Id; RAS_Type : Entity_Id; RAS_Name : Name_Id; Async_E : Entity_Id; Subp_Id : Int; Attribute_Subp : Entity_Id; Parameter : Node_Id; begin -- Check if we have to expand the access attribute Remote_Subp := Entity (Prefix (N)); if not Expander_Active then return; elsif Ekind (New_Type) = E_Record_Type then RAS_Type := New_Type; else -- If the remote type has not been constructed yet, create -- it and its attributes now. Attribute_Subp := TSS (New_Type, Name_uRAS_Access); if No (Attribute_Subp) then Add_RAST_Features (Parent (New_Type)); end if; RAS_Type := Equivalent_Type (New_Type); end if; RAS_Name := Chars (RAS_Type); RAS_Decl := Parent (RAS_Type); Attribute_Subp := TSS (RAS_Type, Name_uRAS_Access); RAS_Pkg_E := Defining_Entity (Parent (RAS_Decl)); Remote_Subp_Decl := Unit_Declaration_Node (Remote_Subp); if Nkind (Remote_Subp_Decl) = N_Subprogram_Body then Remote_Subp := Corresponding_Spec (Remote_Subp_Decl); Remote_Subp_Decl := Unit_Declaration_Node (Remote_Subp); end if; RS_Pkg_Specif := Parent (Remote_Subp_Decl); RS_Pkg_E := Defining_Entity (RS_Pkg_Specif); Subp_Id := Get_Subprogram_Id (Remote_Subp); if Ekind (Remote_Subp) = E_Procedure and then Is_Asynchronous (Remote_Subp) then Async_E := Standard_True; else Async_E := Standard_False; end if; -- Right now, we do not call the Name_uAddress_Resolver subprogram, -- which means that we end up with a Null_Address value in the ras -- field: each dereference of an RAS will go through the PCS, which -- is authorized but potentially not very efficient ??? Parameter := New_Occurrence_Of (RTE (RE_Null_Address), Loc); Tick_Access_Conv_Call := Make_Function_Call (Loc, Name => New_Occurrence_Of (Attribute_Subp, Loc), Parameter_Associations => New_List ( Parameter, Make_String_Literal (Loc, Full_Qualified_Name (RS_Pkg_E)), Make_Integer_Literal (Loc, Subp_Id), New_Occurrence_Of (Async_E, Loc))); Rewrite (N, Tick_Access_Conv_Call); Analyze_And_Resolve (N, RAS_Type); end Process_Remote_AST_Attribute; ------------------------------------ -- Process_Remote_AST_Declaration -- ------------------------------------ procedure Process_Remote_AST_Declaration (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); User_Type : constant Node_Id := Defining_Identifier (N); Fat_Type : constant Entity_Id := Make_Defining_Identifier (Loc, Chars (User_Type)); New_Type_Decl : Node_Id; begin -- We add a record type declaration for the equivalent fat pointer type New_Type_Decl := Make_Full_Type_Declaration (Loc, Defining_Identifier => Fat_Type, Type_Definition => Make_Record_Definition (Loc, Component_List => Make_Component_List (Loc, Component_Items => New_List ( Make_Component_Declaration (Loc, Defining_Identifier => Make_Defining_Identifier (Loc, Chars => Name_Ras), Subtype_Indication => New_Occurrence_Of (RTE (RE_Unsigned_64), Loc)), Make_Component_Declaration (Loc, Defining_Identifier => Make_Defining_Identifier (Loc, Chars => Name_Origin), Subtype_Indication => New_Reference_To (Standard_Integer, Loc)), Make_Component_Declaration (Loc, Defining_Identifier => Make_Defining_Identifier (Loc, Chars => Name_Receiver), Subtype_Indication => New_Reference_To (RTE (RE_Unsigned_64), Loc)), Make_Component_Declaration (Loc, Defining_Identifier => Make_Defining_Identifier (Loc, Chars => Name_Subp_Id), Subtype_Indication => New_Reference_To (Standard_Natural, Loc)), Make_Component_Declaration (Loc, Defining_Identifier => Make_Defining_Identifier (Loc, Chars => Name_Async), Subtype_Indication => New_Reference_To (Standard_Boolean, Loc)))))); Insert_After (N, New_Type_Decl); Set_Equivalent_Type (User_Type, Fat_Type); Set_Corresponding_Remote_Type (Fat_Type, User_Type); -- The reason we suppress the initialization procedure is that we know -- that no initialization is required (even if Initialize_Scalars mode -- is active), and there are order of elaboration problems if we do try -- to generate an Init_Proc for this created record type. Set_Suppress_Init_Proc (Fat_Type); if Expander_Active then Add_RAST_Features (Parent (User_Type)); end if; end Process_Remote_AST_Declaration; ----------------------- -- RAS_E_Dereference -- ----------------------- procedure RAS_E_Dereference (Pref : Node_Id) is Loc : constant Source_Ptr := Sloc (Pref); Call_Node : Node_Id; New_Type : constant Entity_Id := Etype (Pref); RAS : constant Entity_Id := Corresponding_Remote_Type (New_Type); RAS_Decl : constant Node_Id := Parent (RAS); Explicit_Deref : constant Node_Id := Parent (Pref); Deref_Subp_Call : constant Node_Id := Parent (Explicit_Deref); Deref_Proc : Entity_Id; Params : List_Id; begin if Nkind (Deref_Subp_Call) = N_Procedure_Call_Statement then Params := Parameter_Associations (Deref_Subp_Call); if Present (Params) then Prepend (Pref, Params); else Params := New_List (Pref); end if; elsif Nkind (Deref_Subp_Call) = N_Indexed_Component then Params := Expressions (Deref_Subp_Call); if Present (Params) then Prepend (Pref, Params); else Params := New_List (Pref); end if; else -- Context is not a call. return; end if; Deref_Proc := TSS (New_Type, Name_uRAS_Dereference); if not Expander_Active then return; elsif No (Deref_Proc) then Add_RAST_Features (RAS_Decl); Deref_Proc := TSS (New_Type, Name_uRAS_Dereference); end if; if Ekind (Deref_Proc) = E_Function then Call_Node := Make_Function_Call (Loc, Name => New_Occurrence_Of (Deref_Proc, Loc), Parameter_Associations => Params); else Call_Node := Make_Procedure_Call_Statement (Loc, Name => New_Occurrence_Of (Deref_Proc, Loc), Parameter_Associations => Params); end if; Rewrite (Deref_Subp_Call, Call_Node); Analyze (Deref_Subp_Call); end RAS_E_Dereference; ------------------------------ -- Remote_AST_E_Dereference -- ------------------------------ function Remote_AST_E_Dereference (P : Node_Id) return Boolean is ET : constant Entity_Id := Etype (P); begin -- Perform the changes only on original dereferences, and only if -- we are generating code. if Comes_From_Source (P) and then Is_Record_Type (ET) and then (Is_Remote_Call_Interface (ET) or else Is_Remote_Types (ET)) and then Present (Corresponding_Remote_Type (ET)) and then (Nkind (Parent (Parent (P))) = N_Procedure_Call_Statement or else Nkind (Parent (Parent (P))) = N_Indexed_Component) and then Expander_Active then RAS_E_Dereference (P); return True; else return False; end if; end Remote_AST_E_Dereference; ------------------------------ -- Remote_AST_I_Dereference -- ------------------------------ function Remote_AST_I_Dereference (P : Node_Id) return Boolean is ET : constant Entity_Id := Etype (P); Deref : Node_Id; begin if Comes_From_Source (P) and then (Is_Remote_Call_Interface (ET) or else Is_Remote_Types (ET)) and then Present (Corresponding_Remote_Type (ET)) and then Ekind (Entity (P)) /= E_Function then Deref := Make_Explicit_Dereference (Sloc (P), Prefix => Relocate_Node (P)); Rewrite (P, Deref); Set_Etype (P, ET); RAS_E_Dereference (Prefix (P)); return True; end if; return False; end Remote_AST_I_Dereference; --------------------------- -- Remote_AST_Null_Value -- --------------------------- function Remote_AST_Null_Value (N : Node_Id; Typ : Entity_Id) return Boolean is Loc : constant Source_Ptr := Sloc (N); Target_Type : Entity_Id; begin if not Expander_Active then return False; elsif Ekind (Typ) = E_Access_Subprogram_Type and then (Is_Remote_Call_Interface (Typ) or else Is_Remote_Types (Typ)) and then Comes_From_Source (N) and then Expander_Active then -- Any null that comes from source and is of the RAS type must -- be expanded, except if expansion is not active (nothing -- gets expanded into the equivalent record type). Target_Type := Equivalent_Type (Typ); elsif Ekind (Typ) = E_Record_Type and then Present (Corresponding_Remote_Type (Typ)) then -- This is a record type representing a RAS type, this must be -- expanded. Target_Type := Typ; else -- We do not have to handle this case return False; end if; Rewrite (N, Make_Aggregate (Loc, Expressions => New_List ( Make_Integer_Literal (Loc, 0), -- Ras Make_Integer_Literal (Loc, 0), -- Origin Make_Integer_Literal (Loc, 0), -- Receiver Make_Integer_Literal (Loc, 0), -- Subp_Id New_Occurrence_Of (Standard_False, Loc)))); -- Asyn Analyze_And_Resolve (N, Target_Type); return True; end Remote_AST_Null_Value; end Sem_Dist;