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
;