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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- E X P _ S M E M --
--- --
--- B o d y --
--- --
--- Copyright (C) 1998-2010, 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 Einfo; use Einfo;
-with Exp_Ch9; use Exp_Ch9;
-with Exp_Util; use Exp_Util;
-with Nmake; use Nmake;
-with Namet; use Namet;
-with Nlists; use Nlists;
-with Rtsfind; use Rtsfind;
-with Sem; use Sem;
-with Sem_Aux; use Sem_Aux;
-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;
-
-package body Exp_Smem is
-
- Insert_Node : Node_Id;
- -- Node after which a write call is to be inserted
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- procedure Add_Read_Before (N : Node_Id);
- -- Insert a Shared_Var_ROpen call for variable before node N
-
- procedure Add_Write_After (N : Node_Id);
- -- Insert a Shared_Var_WOpen call for variable after the node
- -- Insert_Node, as recorded by On_Lhs_Of_Assignment (where it points
- -- to the assignment statement) or Is_Out_Actual (where it points to
- -- the procedure call statement).
-
- procedure Build_Full_Name (E : Entity_Id; N : out String_Id);
- -- Build the fully qualified string name of a shared variable
-
- function On_Lhs_Of_Assignment (N : Node_Id) return Boolean;
- -- Determines if N is on the left hand of the assignment. This means
- -- that either it is a simple variable, or it is a record or array
- -- variable with a corresponding selected or indexed component on
- -- the left side of an assignment. If the result is True, then
- -- Insert_Node is set to point to the assignment
-
- function Is_Out_Actual (N : Node_Id) return Boolean;
- -- In a similar manner, this function determines if N appears as an
- -- OUT or IN OUT parameter to a procedure call. If the result is
- -- True, then Insert_Node is set to point to the call.
-
- function Build_Shared_Var_Proc_Call
- (Loc : Source_Ptr;
- E : Node_Id;
- N : Name_Id) return Node_Id;
- -- Build a call to support procedure N for shared object E (provided by
- -- the instance of System.Shared_Storage.Shared_Var_Procs associated to E).
-
- --------------------------------
- -- Build_Shared_Var_Proc_Call --
- --------------------------------
-
- function Build_Shared_Var_Proc_Call
- (Loc : Source_Ptr;
- E : Entity_Id;
- N : Name_Id) return Node_Id is
- begin
- return Make_Procedure_Call_Statement (Loc,
- Name => Make_Selected_Component (Loc,
- Prefix =>
- New_Occurrence_Of (Shared_Var_Procs_Instance (E), Loc),
- Selector_Name => Make_Identifier (Loc, N)));
- end Build_Shared_Var_Proc_Call;
-
- ---------------------
- -- Add_Read_Before --
- ---------------------
-
- procedure Add_Read_Before (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Ent : constant Node_Id := Entity (N);
- begin
- if Present (Shared_Var_Procs_Instance (Ent)) then
- Insert_Action (N, Build_Shared_Var_Proc_Call (Loc, Ent, Name_Read));
- end if;
- end Add_Read_Before;
-
- -------------------------------
- -- Add_Shared_Var_Lock_Procs --
- -------------------------------
-
- procedure Add_Shared_Var_Lock_Procs (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Obj : constant Entity_Id := Entity (Expression (First_Actual (N)));
- Inode : Node_Id;
- Vnm : String_Id;
-
- begin
- -- We have to add Shared_Var_Lock and Shared_Var_Unlock calls around
- -- the procedure or function call node. First we locate the right
- -- place to do the insertion, which is the call itself in the
- -- procedure call case, or else the nearest non subexpression
- -- node that contains the function call.
-
- Inode := N;
- while Nkind (Inode) /= N_Procedure_Call_Statement
- and then Nkind (Inode) in N_Subexpr
- loop
- Inode := Parent (Inode);
- end loop;
-
- -- Now insert the Lock and Unlock calls and the read/write calls
-
- -- Two concerns here. First we are not dealing with the exception
- -- case, really we need some kind of cleanup routine to do the
- -- Unlock. Second, these lock calls should be inside the protected
- -- object processing, not outside, otherwise they can be done at
- -- the wrong priority, resulting in dead lock situations ???
-
- Build_Full_Name (Obj, Vnm);
-
- -- First insert the Lock call before
-
- Insert_Before_And_Analyze (Inode,
- Make_Procedure_Call_Statement (Loc,
- Name => New_Occurrence_Of (RTE (RE_Shared_Var_Lock), Loc),
- Parameter_Associations => New_List (
- Make_String_Literal (Loc, Vnm))));
-
- -- Now, right after the Lock, insert a call to read the object
-
- Insert_Before_And_Analyze (Inode,
- Build_Shared_Var_Proc_Call (Loc, Obj, Name_Read));
-
- -- Now insert the Unlock call after
-
- Insert_After_And_Analyze (Inode,
- Make_Procedure_Call_Statement (Loc,
- Name => New_Occurrence_Of (RTE (RE_Shared_Var_Unlock), Loc),
- Parameter_Associations => New_List (
- Make_String_Literal (Loc, Vnm))));
-
- -- Now for a procedure call, but not a function call, insert the
- -- call to write the object just before the unlock.
-
- if Nkind (N) = N_Procedure_Call_Statement then
- Insert_After_And_Analyze (Inode,
- Build_Shared_Var_Proc_Call (Loc, Obj, Name_Write));
- end if;
-
- end Add_Shared_Var_Lock_Procs;
-
- ---------------------
- -- Add_Write_After --
- ---------------------
-
- procedure Add_Write_After (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Ent : constant Node_Id := Entity (N);
-
- begin
- if Present (Shared_Var_Procs_Instance (Ent)) then
- Insert_After_And_Analyze (Insert_Node,
- Build_Shared_Var_Proc_Call (Loc, Ent, Name_Write));
- end if;
- end Add_Write_After;
-
- ---------------------
- -- Build_Full_Name --
- ---------------------
-
- procedure Build_Full_Name (E : Entity_Id; N : out String_Id) is
-
- procedure Build_Name (E : Entity_Id);
- -- This is a recursive routine used to construct the fully qualified
- -- string name of the package corresponding to the shared variable.
-
- ----------------
- -- Build_Name --
- ----------------
-
- procedure Build_Name (E : Entity_Id) is
- begin
- if Scope (E) /= Standard_Standard then
- Build_Name (Scope (E));
- Store_String_Char ('.');
- end if;
-
- Get_Decoded_Name_String (Chars (E));
- Store_String_Chars (Name_Buffer (1 .. Name_Len));
- end Build_Name;
-
- -- Start of processing for Build_Full_Name
-
- begin
- Start_String;
- Build_Name (E);
- N := End_String;
- end Build_Full_Name;
-
- ------------------------------------
- -- Expand_Shared_Passive_Variable --
- ------------------------------------
-
- procedure Expand_Shared_Passive_Variable (N : Node_Id) is
- Typ : constant Entity_Id := Etype (N);
-
- begin
- -- Nothing to do for protected or limited objects
-
- if Is_Limited_Type (Typ) or else Is_Concurrent_Type (Typ) then
- return;
-
- -- If we are on the left hand side of an assignment, then we add
- -- the write call after the assignment.
-
- elsif On_Lhs_Of_Assignment (N) then
- Add_Write_After (N);
-
- -- If we are a parameter for an out or in out formal, then put
- -- the read before and the write after.
-
- elsif Is_Out_Actual (N) then
- Add_Read_Before (N);
- Add_Write_After (N);
-
- -- All other cases are simple reads
-
- else
- Add_Read_Before (N);
- end if;
- end Expand_Shared_Passive_Variable;
-
- -------------------
- -- Is_Out_Actual --
- -------------------
-
- function Is_Out_Actual (N : Node_Id) return Boolean is
- Formal : Entity_Id;
- Call : Node_Id;
-
- begin
- Find_Actual (N, Formal, Call);
-
- if No (Formal) then
- return False;
-
- else
- if Ekind_In (Formal, E_Out_Parameter, E_In_Out_Parameter) then
- Insert_Node := Call;
- return True;
- else
- return False;
- end if;
- end if;
- end Is_Out_Actual;
-
- ---------------------------
- -- Make_Shared_Var_Procs --
- ---------------------------
-
- function Make_Shared_Var_Procs (N : Node_Id) return Node_Id is
- Loc : constant Source_Ptr := Sloc (N);
- Ent : constant Entity_Id := Defining_Identifier (N);
- Typ : constant Entity_Id := Etype (Ent);
- Vnm : String_Id;
- Obj : Node_Id;
- Obj_Typ : Entity_Id;
-
- After : constant Node_Id := Next (N);
- -- Node located right after N originally (after insertion of the SV
- -- procs this node is right after the last inserted node).
-
- SVP_Instance : constant Entity_Id := Make_Defining_Identifier (Loc,
- Chars => New_External_Name (Chars (Ent), 'G'));
- -- Instance of System.Shared_Storage.Shared_Var_Procs associated
- -- with Ent.
-
- Instantiation : Node_Id;
- -- Package instantiation node for SVP_Instance
-
- -- Start of processing for Make_Shared_Var_Procs
-
- begin
- Build_Full_Name (Ent, Vnm);
-
- -- We turn off Shared_Passive during construction and analysis of
- -- the generic package instantiation, to avoid improper attempts to
- -- process the variable references within these instantiation.
-
- Set_Is_Shared_Passive (Ent, False);
-
- -- Construct generic package instantiation
-
- -- package varG is new Shared_Var_Procs (typ, var, "pkg.var");
-
- Obj := New_Occurrence_Of (Ent, Loc);
- Obj_Typ := Typ;
- if Is_Concurrent_Type (Typ) then
- Obj := Convert_Concurrent (N => Obj, Typ => Typ);
- Obj_Typ := Corresponding_Record_Type (Typ);
- end if;
-
- Instantiation :=
- Make_Package_Instantiation (Loc,
- Defining_Unit_Name => SVP_Instance,
- Name =>
- New_Occurrence_Of (RTE (RE_Shared_Var_Procs), Loc),
- Generic_Associations => New_List (
- Make_Generic_Association (Loc,
- Explicit_Generic_Actual_Parameter =>
- New_Occurrence_Of (Obj_Typ, Loc)),
- Make_Generic_Association (Loc,
- Explicit_Generic_Actual_Parameter => Obj),
- Make_Generic_Association (Loc,
- Explicit_Generic_Actual_Parameter =>
- Make_String_Literal (Loc, Vnm))));
-
- Insert_After_And_Analyze (N, Instantiation);
-
- Set_Is_Shared_Passive (Ent, True);
- Set_Shared_Var_Procs_Instance
- (Ent, Defining_Entity (Instance_Spec (Instantiation)));
-
- -- Return last node before After
-
- declare
- Nod : Node_Id := Next (N);
-
- begin
- while Next (Nod) /= After loop
- Nod := Next (Nod);
- end loop;
-
- return Nod;
- end;
- end Make_Shared_Var_Procs;
-
- --------------------------
- -- On_Lhs_Of_Assignment --
- --------------------------
-
- function On_Lhs_Of_Assignment (N : Node_Id) return Boolean is
- P : constant Node_Id := Parent (N);
-
- begin
- if Nkind (P) = N_Assignment_Statement then
- if N = Name (P) then
- Insert_Node := P;
- return True;
- else
- return False;
- end if;
-
- elsif (Nkind (P) = N_Indexed_Component
- or else
- Nkind (P) = N_Selected_Component)
- and then N = Prefix (P)
- then
- return On_Lhs_Of_Assignment (P);
-
- else
- return False;
- end if;
- end On_Lhs_Of_Assignment;
-
-end Exp_Smem;