------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- E X P _ V F P T -- -- -- -- B o d y -- -- -- -- -- -- Copyright (C) 1997-2001 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 Einfo; use Einfo; with Nlists; use Nlists; with Nmake; use Nmake; with Rtsfind; use Rtsfind; with Sem_Res; use Sem_Res; with Sinfo; use Sinfo; with Snames; use Snames; with Stand; use Stand; with Tbuild; use Tbuild; with Ttypef; use Ttypef; with Uintp; use Uintp; with Urealp; use Urealp; package body Exp_VFpt is ---------------------- -- Expand_Vax_Arith -- ---------------------- procedure Expand_Vax_Arith (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); Typ : constant Entity_Id := Base_Type (Etype (N)); Typc : Character; Atyp : Entity_Id; Func : RE_Id; Args : List_Id; begin -- Get arithmetic type, note that we do D stuff in G if Digits_Value (Typ) = VAXFF_Digits then Typc := 'F'; Atyp := RTE (RE_F); else Typc := 'G'; Atyp := RTE (RE_G); end if; case Nkind (N) is when N_Op_Abs => if Typc = 'F' then Func := RE_Abs_F; else Func := RE_Abs_G; end if; when N_Op_Add => if Typc = 'F' then Func := RE_Add_F; else Func := RE_Add_G; end if; when N_Op_Divide => if Typc = 'F' then Func := RE_Div_F; else Func := RE_Div_G; end if; when N_Op_Multiply => if Typc = 'F' then Func := RE_Mul_F; else Func := RE_Mul_G; end if; when N_Op_Minus => if Typc = 'F' then Func := RE_Neg_F; else Func := RE_Neg_G; end if; when N_Op_Subtract => if Typc = 'F' then Func := RE_Sub_F; else Func := RE_Sub_G; end if; when others => Func := RE_Null; raise Program_Error; end case; Args := New_List; if Nkind (N) in N_Binary_Op then Append_To (Args, Convert_To (Atyp, Left_Opnd (N))); end if; Append_To (Args, Convert_To (Atyp, Right_Opnd (N))); Rewrite (N, Convert_To (Typ, Make_Function_Call (Loc, Name => New_Occurrence_Of (RTE (Func), Loc), Parameter_Associations => Args))); Analyze_And_Resolve (N, Typ, Suppress => All_Checks); end Expand_Vax_Arith; --------------------------- -- Expand_Vax_Comparison -- --------------------------- procedure Expand_Vax_Comparison (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); Typ : constant Entity_Id := Base_Type (Etype (Left_Opnd (N))); Typc : Character; Func : RE_Id; Atyp : Entity_Id; Revrs : Boolean := False; Args : List_Id; begin -- Get arithmetic type, note that we do D stuff in G if Digits_Value (Typ) = VAXFF_Digits then Typc := 'F'; Atyp := RTE (RE_F); else Typc := 'G'; Atyp := RTE (RE_G); end if; case Nkind (N) is when N_Op_Eq => if Typc = 'F' then Func := RE_Eq_F; else Func := RE_Eq_G; end if; when N_Op_Ge => if Typc = 'F' then Func := RE_Le_F; else Func := RE_Le_G; end if; Revrs := True; when N_Op_Gt => if Typc = 'F' then Func := RE_Lt_F; else Func := RE_Lt_G; end if; Revrs := True; when N_Op_Le => if Typc = 'F' then Func := RE_Le_F; else Func := RE_Le_G; end if; when N_Op_Lt => if Typc = 'F' then Func := RE_Lt_F; else Func := RE_Lt_G; end if; when others => Func := RE_Null; raise Program_Error; end case; if not Revrs then Args := New_List ( Convert_To (Atyp, Left_Opnd (N)), Convert_To (Atyp, Right_Opnd (N))); else Args := New_List ( Convert_To (Atyp, Right_Opnd (N)), Convert_To (Atyp, Left_Opnd (N))); end if; Rewrite (N, Make_Function_Call (Loc, Name => New_Occurrence_Of (RTE (Func), Loc), Parameter_Associations => Args)); Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks); end Expand_Vax_Comparison; --------------------------- -- Expand_Vax_Conversion -- --------------------------- procedure Expand_Vax_Conversion (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); Expr : constant Node_Id := Expression (N); S_Typ : constant Entity_Id := Base_Type (Etype (Expr)); T_Typ : constant Entity_Id := Base_Type (Etype (N)); CallS : RE_Id; CallT : RE_Id; Func : RE_Id; function Call_Type (T : Entity_Id; Otyp : Entity_Id) return RE_Id; -- Given one of the two types T, determines the coresponding call -- type, i.e. the type to be used for the call (or the result of -- the call). The actual operand is converted to (or from) this type. -- Otyp is the other type, which is useful in figuring out the result. -- The result returned is the RE_Id value for the type entity. function Equivalent_Integer_Type (T : Entity_Id) return Entity_Id; -- Find the predefined integer type that has the same size as the -- fixed-point type T, for use in fixed/float conversions. --------------- -- Call_Type -- --------------- function Call_Type (T : Entity_Id; Otyp : Entity_Id) return RE_Id is begin -- Vax float formats if Vax_Float (T) then if Digits_Value (T) = VAXFF_Digits then return RE_F; elsif Digits_Value (T) = VAXGF_Digits then return RE_G; -- For D_Float, leave it as D float if the other operand is -- G_Float, since this is the one conversion that is properly -- supported for D_Float, but otherwise, use G_Float. else pragma Assert (Digits_Value (T) = VAXDF_Digits); if Vax_Float (Otyp) and then Digits_Value (Otyp) = VAXGF_Digits then return RE_D; else return RE_G; end if; end if; -- For all discrete types, use 64-bit integer elsif Is_Discrete_Type (T) then return RE_Q; -- For all real types (other than Vax float format), we use the -- IEEE float-type which corresponds in length to the other type -- (which is Vax Float). else pragma Assert (Is_Real_Type (T)); if Digits_Value (Otyp) = VAXFF_Digits then return RE_S; else return RE_T; end if; end if; end Call_Type; function Equivalent_Integer_Type (T : Entity_Id) return Entity_Id is begin if Esize (T) = Esize (Standard_Long_Long_Integer) then return Standard_Long_Long_Integer; elsif Esize (T) = Esize (Standard_Long_Integer) then return Standard_Long_Integer; else return Standard_Integer; end if; end Equivalent_Integer_Type; -- Start of processing for Expand_Vax_Conversion; begin -- If input and output are the same Vax type, we change the -- conversion to be an unchecked conversion and that's it. if Vax_Float (S_Typ) and then Vax_Float (T_Typ) and then Digits_Value (S_Typ) = Digits_Value (T_Typ) then Rewrite (N, Unchecked_Convert_To (T_Typ, Expr)); elsif Is_Fixed_Point_Type (S_Typ) then -- convert the scaled integer value to the target type, and multiply -- by 'Small of type. Rewrite (N, Make_Op_Multiply (Loc, Left_Opnd => Make_Type_Conversion (Loc, Subtype_Mark => New_Occurrence_Of (T_Typ, Loc), Expression => Unchecked_Convert_To ( Equivalent_Integer_Type (S_Typ), Expr)), Right_Opnd => Make_Real_Literal (Loc, Realval => Small_Value (S_Typ)))); elsif Is_Fixed_Point_Type (T_Typ) then -- multiply value by 'small of type, and convert to the corresponding -- integer type. Rewrite (N, Unchecked_Convert_To (T_Typ, Make_Type_Conversion (Loc, Subtype_Mark => New_Occurrence_Of (Equivalent_Integer_Type (T_Typ), Loc), Expression => Make_Op_Multiply (Loc, Left_Opnd => Expr, Right_Opnd => Make_Real_Literal (Loc, Realval => Ureal_1 / Small_Value (T_Typ)))))); -- All other cases. else -- Compute types for call CallS := Call_Type (S_Typ, T_Typ); CallT := Call_Type (T_Typ, S_Typ); -- Get function and its types if CallS = RE_D and then CallT = RE_G then Func := RE_D_To_G; elsif CallS = RE_G and then CallT = RE_D then Func := RE_G_To_D; elsif CallS = RE_G and then CallT = RE_F then Func := RE_G_To_F; elsif CallS = RE_F and then CallT = RE_G then Func := RE_F_To_G; elsif CallS = RE_F and then CallT = RE_S then Func := RE_F_To_S; elsif CallS = RE_S and then CallT = RE_F then Func := RE_S_To_F; elsif CallS = RE_G and then CallT = RE_T then Func := RE_G_To_T; elsif CallS = RE_T and then CallT = RE_G then Func := RE_T_To_G; elsif CallS = RE_F and then CallT = RE_Q then Func := RE_F_To_Q; elsif CallS = RE_Q and then CallT = RE_F then Func := RE_Q_To_F; elsif CallS = RE_G and then CallT = RE_Q then Func := RE_G_To_Q; else pragma Assert (CallS = RE_Q and then CallT = RE_G); Func := RE_Q_To_G; end if; Rewrite (N, Convert_To (T_Typ, Make_Function_Call (Loc, Name => New_Occurrence_Of (RTE (Func), Loc), Parameter_Associations => New_List ( Convert_To (RTE (CallS), Expr))))); end if; Analyze_And_Resolve (N, T_Typ, Suppress => All_Checks); end Expand_Vax_Conversion; ----------------------------- -- Expand_Vax_Real_Literal -- ----------------------------- procedure Expand_Vax_Real_Literal (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); Typ : constant Entity_Id := Etype (N); Btyp : constant Entity_Id := Base_Type (Typ); Stat : constant Boolean := Is_Static_Expression (N); Nod : Node_Id; RE_Source : RE_Id; RE_Target : RE_Id; RE_Fncall : RE_Id; -- Entities for source, target and function call in conversion begin -- We do not know how to convert Vax format real literals, so what -- we do is to convert these to be IEEE literals, and introduce the -- necessary conversion operation. if Vax_Float (Btyp) then -- What we want to construct here is -- x!(y_to_z (1.0E0)) -- where -- x is the base type of the literal (Btyp) -- y_to_z is -- s_to_f for F_Float -- t_to_g for G_Float -- t_to_d for D_Float -- The literal is typed as S (for F_Float) or T otherwise -- We do all our own construction, analysis, and expansion here, -- since things are at too low a level to use Analyze or Expand -- to get this built (we get circularities and other strange -- problems if we try!) if Digits_Value (Btyp) = VAXFF_Digits then RE_Source := RE_S; RE_Target := RE_F; RE_Fncall := RE_S_To_F; elsif Digits_Value (Btyp) = VAXDF_Digits then RE_Source := RE_T; RE_Target := RE_D; RE_Fncall := RE_T_To_D; else pragma Assert (Digits_Value (Btyp) = VAXGF_Digits); RE_Source := RE_T; RE_Target := RE_G; RE_Fncall := RE_T_To_G; end if; Nod := Relocate_Node (N); Set_Etype (Nod, RTE (RE_Source)); Set_Analyzed (Nod, True); Nod := Make_Function_Call (Loc, Name => New_Occurrence_Of (RTE (RE_Fncall), Loc), Parameter_Associations => New_List (Nod)); Set_Etype (Nod, RTE (RE_Target)); Set_Analyzed (Nod, True); Nod := Make_Unchecked_Type_Conversion (Loc, Subtype_Mark => New_Occurrence_Of (Typ, Loc), Expression => Nod); Set_Etype (Nod, Typ); Set_Analyzed (Nod, True); Rewrite (N, Nod); -- This odd expression is still a static expression. Note that -- the routine Sem_Eval.Expr_Value_R understands this. Set_Is_Static_Expression (N, Stat); end if; end Expand_Vax_Real_Literal; end Exp_VFpt;