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|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- E X P _ V F P T --
-- --
-- B o d y --
-- --
-- $Revision: 1.7 $ --
-- --
-- Copyright (C) 1997 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 Einfo; use Einfo;
with Exp_Util; use Exp_Util;
with Nlists; use Nlists;
with Nmake; use Nmake;
with Opt; use Opt;
with Rtsfind; use Rtsfind;
with Sem; use Sem;
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;
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 =>
pragma Assert (False);
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 =>
pragma Assert (False);
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.
---------------
-- 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).
elsif Is_Real_Type (T) then
if Digits_Value (Otyp) = VAXFF_Digits then
return RE_S;
else
return RE_T;
end if;
-- That should be all possibilities
else
pragma Assert (False);
raise Program_Error;
end if;
end Call_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));
-- 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;
elsif CallS = RE_Q and then CallT = RE_G then
Func := RE_Q_To_G;
-- That should be all possibilities
else
pragma Assert (False);
raise Program_Error;
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;
elsif Digits_Value (Btyp) = VAXGF_Digits then
RE_Source := RE_T;
RE_Target := RE_G;
RE_Fncall := RE_T_To_G;
else
pragma Assert (False);
raise Program_Error;
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;
|
