1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
10 -- Copyright (C) 1997-2001 Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- GNAT was originally developed by the GNAT team at New York University. --
24 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
26 ------------------------------------------------------------------------------
28 with Atree; use Atree;
29 with Einfo; use Einfo;
30 with Nlists; use Nlists;
31 with Nmake; use Nmake;
32 with Rtsfind; use Rtsfind;
33 with Sem_Res; use Sem_Res;
34 with Sinfo; use Sinfo;
35 with Snames; use Snames;
36 with Stand; use Stand;
37 with Tbuild; use Tbuild;
38 with Ttypef; use Ttypef;
39 with Uintp; use Uintp;
40 with Urealp; use Urealp;
42 package body Exp_VFpt is
44 ----------------------
45 -- Expand_Vax_Arith --
46 ----------------------
48 procedure Expand_Vax_Arith (N : Node_Id) is
49 Loc : constant Source_Ptr := Sloc (N);
50 Typ : constant Entity_Id := Base_Type (Etype (N));
57 -- Get arithmetic type, note that we do D stuff in G
59 if Digits_Value (Typ) = VAXFF_Digits then
104 when N_Op_Subtract =>
119 if Nkind (N) in N_Binary_Op then
121 Convert_To (Atyp, Left_Opnd (N)));
125 Convert_To (Atyp, Right_Opnd (N)));
129 Make_Function_Call (Loc,
130 Name => New_Occurrence_Of (RTE (Func), Loc),
131 Parameter_Associations => Args)));
133 Analyze_And_Resolve (N, Typ, Suppress => All_Checks);
134 end Expand_Vax_Arith;
136 ---------------------------
137 -- Expand_Vax_Comparison --
138 ---------------------------
140 procedure Expand_Vax_Comparison (N : Node_Id) is
141 Loc : constant Source_Ptr := Sloc (N);
142 Typ : constant Entity_Id := Base_Type (Etype (Left_Opnd (N)));
146 Revrs : Boolean := False;
150 -- Get arithmetic type, note that we do D stuff in G
152 if Digits_Value (Typ) = VAXFF_Digits then
209 Convert_To (Atyp, Left_Opnd (N)),
210 Convert_To (Atyp, Right_Opnd (N)));
214 Convert_To (Atyp, Right_Opnd (N)),
215 Convert_To (Atyp, Left_Opnd (N)));
219 Make_Function_Call (Loc,
220 Name => New_Occurrence_Of (RTE (Func), Loc),
221 Parameter_Associations => Args));
223 Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks);
224 end Expand_Vax_Comparison;
226 ---------------------------
227 -- Expand_Vax_Conversion --
228 ---------------------------
230 procedure Expand_Vax_Conversion (N : Node_Id) is
231 Loc : constant Source_Ptr := Sloc (N);
232 Expr : constant Node_Id := Expression (N);
233 S_Typ : constant Entity_Id := Base_Type (Etype (Expr));
234 T_Typ : constant Entity_Id := Base_Type (Etype (N));
240 function Call_Type (T : Entity_Id; Otyp : Entity_Id) return RE_Id;
241 -- Given one of the two types T, determines the coresponding call
242 -- type, i.e. the type to be used for the call (or the result of
243 -- the call). The actual operand is converted to (or from) this type.
244 -- Otyp is the other type, which is useful in figuring out the result.
245 -- The result returned is the RE_Id value for the type entity.
247 function Equivalent_Integer_Type (T : Entity_Id) return Entity_Id;
248 -- Find the predefined integer type that has the same size as the
249 -- fixed-point type T, for use in fixed/float conversions.
255 function Call_Type (T : Entity_Id; Otyp : Entity_Id) return RE_Id is
259 if Vax_Float (T) then
260 if Digits_Value (T) = VAXFF_Digits then
263 elsif Digits_Value (T) = VAXGF_Digits then
266 -- For D_Float, leave it as D float if the other operand is
267 -- G_Float, since this is the one conversion that is properly
268 -- supported for D_Float, but otherwise, use G_Float.
270 else pragma Assert (Digits_Value (T) = VAXDF_Digits);
273 and then Digits_Value (Otyp) = VAXGF_Digits
281 -- For all discrete types, use 64-bit integer
283 elsif Is_Discrete_Type (T) then
286 -- For all real types (other than Vax float format), we use the
287 -- IEEE float-type which corresponds in length to the other type
288 -- (which is Vax Float).
290 else pragma Assert (Is_Real_Type (T));
292 if Digits_Value (Otyp) = VAXFF_Digits then
300 function Equivalent_Integer_Type (T : Entity_Id) return Entity_Id is
302 if Esize (T) = Esize (Standard_Long_Long_Integer) then
303 return Standard_Long_Long_Integer;
305 elsif Esize (T) = Esize (Standard_Long_Integer) then
306 return Standard_Long_Integer;
309 return Standard_Integer;
311 end Equivalent_Integer_Type;
314 -- Start of processing for Expand_Vax_Conversion;
317 -- If input and output are the same Vax type, we change the
318 -- conversion to be an unchecked conversion and that's it.
320 if Vax_Float (S_Typ) and then Vax_Float (T_Typ)
321 and then Digits_Value (S_Typ) = Digits_Value (T_Typ)
324 Unchecked_Convert_To (T_Typ, Expr));
327 elsif Is_Fixed_Point_Type (S_Typ) then
329 -- convert the scaled integer value to the target type, and multiply
330 -- by 'Small of type.
333 Make_Op_Multiply (Loc,
335 Make_Type_Conversion (Loc,
336 Subtype_Mark => New_Occurrence_Of (T_Typ, Loc),
338 Unchecked_Convert_To (
339 Equivalent_Integer_Type (S_Typ), Expr)),
341 Make_Real_Literal (Loc, Realval => Small_Value (S_Typ))));
343 elsif Is_Fixed_Point_Type (T_Typ) then
345 -- multiply value by 'small of type, and convert to the corresponding
349 Unchecked_Convert_To (T_Typ,
350 Make_Type_Conversion (Loc,
352 New_Occurrence_Of (Equivalent_Integer_Type (T_Typ), Loc),
354 Make_Op_Multiply (Loc,
357 Make_Real_Literal (Loc,
358 Realval => Ureal_1 / Small_Value (T_Typ))))));
363 -- Compute types for call
365 CallS := Call_Type (S_Typ, T_Typ);
366 CallT := Call_Type (T_Typ, S_Typ);
368 -- Get function and its types
370 if CallS = RE_D and then CallT = RE_G then
373 elsif CallS = RE_G and then CallT = RE_D then
376 elsif CallS = RE_G and then CallT = RE_F then
379 elsif CallS = RE_F and then CallT = RE_G then
382 elsif CallS = RE_F and then CallT = RE_S then
385 elsif CallS = RE_S and then CallT = RE_F then
388 elsif CallS = RE_G and then CallT = RE_T then
391 elsif CallS = RE_T and then CallT = RE_G then
394 elsif CallS = RE_F and then CallT = RE_Q then
397 elsif CallS = RE_Q and then CallT = RE_F then
400 elsif CallS = RE_G and then CallT = RE_Q then
403 else pragma Assert (CallS = RE_Q and then CallT = RE_G);
409 Make_Function_Call (Loc,
410 Name => New_Occurrence_Of (RTE (Func), Loc),
411 Parameter_Associations => New_List (
412 Convert_To (RTE (CallS), Expr)))));
415 Analyze_And_Resolve (N, T_Typ, Suppress => All_Checks);
416 end Expand_Vax_Conversion;
418 -----------------------------
419 -- Expand_Vax_Real_Literal --
420 -----------------------------
422 procedure Expand_Vax_Real_Literal (N : Node_Id) is
423 Loc : constant Source_Ptr := Sloc (N);
424 Typ : constant Entity_Id := Etype (N);
425 Btyp : constant Entity_Id := Base_Type (Typ);
426 Stat : constant Boolean := Is_Static_Expression (N);
432 -- Entities for source, target and function call in conversion
435 -- We do not know how to convert Vax format real literals, so what
436 -- we do is to convert these to be IEEE literals, and introduce the
437 -- necessary conversion operation.
439 if Vax_Float (Btyp) then
440 -- What we want to construct here is
442 -- x!(y_to_z (1.0E0))
446 -- x is the base type of the literal (Btyp)
450 -- s_to_f for F_Float
451 -- t_to_g for G_Float
452 -- t_to_d for D_Float
454 -- The literal is typed as S (for F_Float) or T otherwise
456 -- We do all our own construction, analysis, and expansion here,
457 -- since things are at too low a level to use Analyze or Expand
458 -- to get this built (we get circularities and other strange
459 -- problems if we try!)
461 if Digits_Value (Btyp) = VAXFF_Digits then
464 RE_Fncall := RE_S_To_F;
466 elsif Digits_Value (Btyp) = VAXDF_Digits then
469 RE_Fncall := RE_T_To_D;
471 else pragma Assert (Digits_Value (Btyp) = VAXGF_Digits);
474 RE_Fncall := RE_T_To_G;
477 Nod := Relocate_Node (N);
479 Set_Etype (Nod, RTE (RE_Source));
480 Set_Analyzed (Nod, True);
483 Make_Function_Call (Loc,
484 Name => New_Occurrence_Of (RTE (RE_Fncall), Loc),
485 Parameter_Associations => New_List (Nod));
487 Set_Etype (Nod, RTE (RE_Target));
488 Set_Analyzed (Nod, True);
491 Make_Unchecked_Type_Conversion (Loc,
492 Subtype_Mark => New_Occurrence_Of (Typ, Loc),
495 Set_Etype (Nod, Typ);
496 Set_Analyzed (Nod, True);
499 -- This odd expression is still a static expression. Note that
500 -- the routine Sem_Eval.Expr_Value_R understands this.
502 Set_Is_Static_Expression (N, Stat);
504 end Expand_Vax_Real_Literal;