1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1997-2002 Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree; use Atree;
28 with Einfo; use Einfo;
29 with Nlists; use Nlists;
30 with Nmake; use Nmake;
31 with Rtsfind; use Rtsfind;
32 with Sem_Res; use Sem_Res;
33 with Sinfo; use Sinfo;
34 with Stand; use Stand;
35 with Tbuild; use Tbuild;
36 with Ttypef; use Ttypef;
37 with Uintp; use Uintp;
38 with Urealp; use Urealp;
40 package body Exp_VFpt is
42 ----------------------
43 -- Expand_Vax_Arith --
44 ----------------------
46 procedure Expand_Vax_Arith (N : Node_Id) is
47 Loc : constant Source_Ptr := Sloc (N);
48 Typ : constant Entity_Id := Base_Type (Etype (N));
55 -- Get arithmetic type, note that we do D stuff in G
57 if Digits_Value (Typ) = VAXFF_Digits then
102 when N_Op_Subtract =>
117 if Nkind (N) in N_Binary_Op then
119 Convert_To (Atyp, Left_Opnd (N)));
123 Convert_To (Atyp, Right_Opnd (N)));
127 Make_Function_Call (Loc,
128 Name => New_Occurrence_Of (RTE (Func), Loc),
129 Parameter_Associations => Args)));
131 Analyze_And_Resolve (N, Typ, Suppress => All_Checks);
132 end Expand_Vax_Arith;
134 ---------------------------
135 -- Expand_Vax_Comparison --
136 ---------------------------
138 procedure Expand_Vax_Comparison (N : Node_Id) is
139 Loc : constant Source_Ptr := Sloc (N);
140 Typ : constant Entity_Id := Base_Type (Etype (Left_Opnd (N)));
144 Revrs : Boolean := False;
148 -- Get arithmetic type, note that we do D stuff in G
150 if Digits_Value (Typ) = VAXFF_Digits then
207 Convert_To (Atyp, Left_Opnd (N)),
208 Convert_To (Atyp, Right_Opnd (N)));
212 Convert_To (Atyp, Right_Opnd (N)),
213 Convert_To (Atyp, Left_Opnd (N)));
217 Make_Function_Call (Loc,
218 Name => New_Occurrence_Of (RTE (Func), Loc),
219 Parameter_Associations => Args));
221 Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks);
222 end Expand_Vax_Comparison;
224 ---------------------------
225 -- Expand_Vax_Conversion --
226 ---------------------------
228 procedure Expand_Vax_Conversion (N : Node_Id) is
229 Loc : constant Source_Ptr := Sloc (N);
230 Expr : constant Node_Id := Expression (N);
231 S_Typ : constant Entity_Id := Base_Type (Etype (Expr));
232 T_Typ : constant Entity_Id := Base_Type (Etype (N));
238 function Call_Type (T : Entity_Id; Otyp : Entity_Id) return RE_Id;
239 -- Given one of the two types T, determines the coresponding call
240 -- type, i.e. the type to be used for the call (or the result of
241 -- the call). The actual operand is converted to (or from) this type.
242 -- Otyp is the other type, which is useful in figuring out the result.
243 -- The result returned is the RE_Id value for the type entity.
245 function Equivalent_Integer_Type (T : Entity_Id) return Entity_Id;
246 -- Find the predefined integer type that has the same size as the
247 -- fixed-point type T, for use in fixed/float conversions.
253 function Call_Type (T : Entity_Id; Otyp : Entity_Id) return RE_Id is
257 if Vax_Float (T) then
258 if Digits_Value (T) = VAXFF_Digits then
261 elsif Digits_Value (T) = VAXGF_Digits then
264 -- For D_Float, leave it as D float if the other operand is
265 -- G_Float, since this is the one conversion that is properly
266 -- supported for D_Float, but otherwise, use G_Float.
268 else pragma Assert (Digits_Value (T) = VAXDF_Digits);
271 and then Digits_Value (Otyp) = VAXGF_Digits
279 -- For all discrete types, use 64-bit integer
281 elsif Is_Discrete_Type (T) then
284 -- For all real types (other than Vax float format), we use the
285 -- IEEE float-type which corresponds in length to the other type
286 -- (which is Vax Float).
288 else pragma Assert (Is_Real_Type (T));
290 if Digits_Value (Otyp) = VAXFF_Digits then
298 function Equivalent_Integer_Type (T : Entity_Id) return Entity_Id is
300 if Esize (T) = Esize (Standard_Long_Long_Integer) then
301 return Standard_Long_Long_Integer;
303 elsif Esize (T) = Esize (Standard_Long_Integer) then
304 return Standard_Long_Integer;
307 return Standard_Integer;
309 end Equivalent_Integer_Type;
311 -- Start of processing for Expand_Vax_Conversion;
314 -- If input and output are the same Vax type, we change the
315 -- conversion to be an unchecked conversion and that's it.
317 if Vax_Float (S_Typ) and then Vax_Float (T_Typ)
318 and then Digits_Value (S_Typ) = Digits_Value (T_Typ)
321 Unchecked_Convert_To (T_Typ, Expr));
323 elsif Is_Fixed_Point_Type (S_Typ) then
325 -- convert the scaled integer value to the target type, and multiply
326 -- by 'Small of type.
329 Make_Op_Multiply (Loc,
331 Make_Type_Conversion (Loc,
332 Subtype_Mark => New_Occurrence_Of (T_Typ, Loc),
334 Unchecked_Convert_To (
335 Equivalent_Integer_Type (S_Typ), Expr)),
337 Make_Real_Literal (Loc, Realval => Small_Value (S_Typ))));
339 elsif Is_Fixed_Point_Type (T_Typ) then
341 -- multiply value by 'small of type, and convert to the corresponding
345 Unchecked_Convert_To (T_Typ,
346 Make_Type_Conversion (Loc,
348 New_Occurrence_Of (Equivalent_Integer_Type (T_Typ), Loc),
350 Make_Op_Multiply (Loc,
353 Make_Real_Literal (Loc,
354 Realval => Ureal_1 / Small_Value (T_Typ))))));
359 -- Compute types for call
361 CallS := Call_Type (S_Typ, T_Typ);
362 CallT := Call_Type (T_Typ, S_Typ);
364 -- Get function and its types
366 if CallS = RE_D and then CallT = RE_G then
369 elsif CallS = RE_G and then CallT = RE_D then
372 elsif CallS = RE_G and then CallT = RE_F then
375 elsif CallS = RE_F and then CallT = RE_G then
378 elsif CallS = RE_F and then CallT = RE_S then
381 elsif CallS = RE_S and then CallT = RE_F then
384 elsif CallS = RE_G and then CallT = RE_T then
387 elsif CallS = RE_T and then CallT = RE_G then
390 elsif CallS = RE_F and then CallT = RE_Q then
393 elsif CallS = RE_Q and then CallT = RE_F then
396 elsif CallS = RE_G and then CallT = RE_Q then
399 else pragma Assert (CallS = RE_Q and then CallT = RE_G);
405 Make_Function_Call (Loc,
406 Name => New_Occurrence_Of (RTE (Func), Loc),
407 Parameter_Associations => New_List (
408 Convert_To (RTE (CallS), Expr)))));
411 Analyze_And_Resolve (N, T_Typ, Suppress => All_Checks);
412 end Expand_Vax_Conversion;
414 -----------------------------
415 -- Expand_Vax_Real_Literal --
416 -----------------------------
418 procedure Expand_Vax_Real_Literal (N : Node_Id) is
419 Loc : constant Source_Ptr := Sloc (N);
420 Typ : constant Entity_Id := Etype (N);
421 Btyp : constant Entity_Id := Base_Type (Typ);
422 Stat : constant Boolean := Is_Static_Expression (N);
428 -- Entities for source, target and function call in conversion
431 -- We do not know how to convert Vax format real literals, so what
432 -- we do is to convert these to be IEEE literals, and introduce the
433 -- necessary conversion operation.
435 if Vax_Float (Btyp) then
436 -- What we want to construct here is
438 -- x!(y_to_z (1.0E0))
442 -- x is the base type of the literal (Btyp)
446 -- s_to_f for F_Float
447 -- t_to_g for G_Float
448 -- t_to_d for D_Float
450 -- The literal is typed as S (for F_Float) or T otherwise
452 -- We do all our own construction, analysis, and expansion here,
453 -- since things are at too low a level to use Analyze or Expand
454 -- to get this built (we get circularities and other strange
455 -- problems if we try!)
457 if Digits_Value (Btyp) = VAXFF_Digits then
460 RE_Fncall := RE_S_To_F;
462 elsif Digits_Value (Btyp) = VAXDF_Digits then
465 RE_Fncall := RE_T_To_D;
467 else pragma Assert (Digits_Value (Btyp) = VAXGF_Digits);
470 RE_Fncall := RE_T_To_G;
473 Nod := Relocate_Node (N);
475 Set_Etype (Nod, RTE (RE_Source));
476 Set_Analyzed (Nod, True);
479 Make_Function_Call (Loc,
480 Name => New_Occurrence_Of (RTE (RE_Fncall), Loc),
481 Parameter_Associations => New_List (Nod));
483 Set_Etype (Nod, RTE (RE_Target));
484 Set_Analyzed (Nod, True);
487 Make_Unchecked_Type_Conversion (Loc,
488 Subtype_Mark => New_Occurrence_Of (Typ, Loc),
491 Set_Etype (Nod, Typ);
492 Set_Analyzed (Nod, True);
495 -- This odd expression is still a static expression. Note that
496 -- the routine Sem_Eval.Expr_Value_R understands this.
498 Set_Is_Static_Expression (N, Stat);
500 end Expand_Vax_Real_Literal;