| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S E M _ D I S T -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- $Revision: 1.182 $ |
| -- -- |
| -- 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. -- |
| -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| 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; |
