* gcc.target/powerpc/builtins-1-le.c: Filter out gimple folding disabled
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1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S E M _ D I M --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 2011-2018, Free Software Foundation, Inc. --
10 -- --
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 3, 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 COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
20 -- --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
23 -- --
24 ------------------------------------------------------------------------------
26 with Aspects; use Aspects;
27 with Atree; use Atree;
28 with Einfo; use Einfo;
29 with Errout; use Errout;
30 with Exp_Util; use Exp_Util;
31 with Lib; use Lib;
32 with Namet; use Namet;
33 with Nlists; use Nlists;
34 with Nmake; use Nmake;
35 with Opt; use Opt;
36 with Rtsfind; use Rtsfind;
37 with Sem; use Sem;
38 with Sem_Aux; use Sem_Aux;
39 with Sem_Eval; use Sem_Eval;
40 with Sem_Res; use Sem_Res;
41 with Sem_Util; use Sem_Util;
42 with Sinfo; use Sinfo;
43 with Sinput; use Sinput;
44 with Snames; use Snames;
45 with Stand; use Stand;
46 with Stringt; use Stringt;
47 with Table;
48 with Tbuild; use Tbuild;
49 with Uintp; use Uintp;
50 with Urealp; use Urealp;
52 with GNAT.HTable;
54 package body Sem_Dim is
56 -------------------------
57 -- Rational Arithmetic --
58 -------------------------
60 type Whole is new Int;
61 subtype Positive_Whole is Whole range 1 .. Whole'Last;
63 type Rational is record
64 Numerator : Whole;
65 Denominator : Positive_Whole;
66 end record;
68 Zero : constant Rational := Rational'(Numerator => 0,
69 Denominator => 1);
71 No_Rational : constant Rational := Rational'(Numerator => 0,
72 Denominator => 2);
73 -- Used to indicate an expression that cannot be interpreted as a rational
74 -- Returned value of the Create_Rational_From routine when parameter Expr
75 -- is not a static representation of a rational.
77 -- Rational constructors
79 function "+" (Right : Whole) return Rational;
80 function GCD (Left, Right : Whole) return Int;
81 function Reduce (X : Rational) return Rational;
83 -- Unary operator for Rational
85 function "-" (Right : Rational) return Rational;
86 function "abs" (Right : Rational) return Rational;
88 -- Rational operations for Rationals
90 function "+" (Left, Right : Rational) return Rational;
91 function "-" (Left, Right : Rational) return Rational;
92 function "*" (Left, Right : Rational) return Rational;
93 function "/" (Left, Right : Rational) return Rational;
95 ------------------
96 -- System Types --
97 ------------------
99 Max_Number_Of_Dimensions : constant := 7;
100 -- Maximum number of dimensions in a dimension system
102 High_Position_Bound : constant := Max_Number_Of_Dimensions;
103 Invalid_Position : constant := 0;
104 Low_Position_Bound : constant := 1;
106 subtype Dimension_Position is
107 Nat range Invalid_Position .. High_Position_Bound;
109 type Name_Array is
110 array (Dimension_Position range
111 Low_Position_Bound .. High_Position_Bound) of Name_Id;
112 -- Store the names of all units within a system
114 No_Names : constant Name_Array := (others => No_Name);
116 type Symbol_Array is
117 array (Dimension_Position range
118 Low_Position_Bound .. High_Position_Bound) of String_Id;
119 -- Store the symbols of all units within a system
121 No_Symbols : constant Symbol_Array := (others => No_String);
123 -- The following record should be documented field by field
125 type System_Type is record
126 Type_Decl : Node_Id;
127 Unit_Names : Name_Array;
128 Unit_Symbols : Symbol_Array;
129 Dim_Symbols : Symbol_Array;
130 Count : Dimension_Position;
131 end record;
133 Null_System : constant System_Type :=
134 (Empty, No_Names, No_Symbols, No_Symbols, Invalid_Position);
136 subtype System_Id is Nat;
138 -- The following table maps types to systems
140 package System_Table is new Table.Table (
141 Table_Component_Type => System_Type,
142 Table_Index_Type => System_Id,
143 Table_Low_Bound => 1,
144 Table_Initial => 5,
145 Table_Increment => 5,
146 Table_Name => "System_Table");
148 --------------------
149 -- Dimension Type --
150 --------------------
152 type Dimension_Type is
153 array (Dimension_Position range
154 Low_Position_Bound .. High_Position_Bound) of Rational;
156 Null_Dimension : constant Dimension_Type := (others => Zero);
158 type Dimension_Table_Range is range 0 .. 510;
159 function Dimension_Table_Hash (Key : Node_Id) return Dimension_Table_Range;
161 -- The following table associates nodes with dimensions
163 package Dimension_Table is new
164 GNAT.HTable.Simple_HTable
165 (Header_Num => Dimension_Table_Range,
166 Element => Dimension_Type,
167 No_Element => Null_Dimension,
168 Key => Node_Id,
169 Hash => Dimension_Table_Hash,
170 Equal => "=");
172 ------------------
173 -- Symbol Types --
174 ------------------
176 type Symbol_Table_Range is range 0 .. 510;
177 function Symbol_Table_Hash (Key : Entity_Id) return Symbol_Table_Range;
179 -- Each subtype with a dimension has a symbolic representation of the
180 -- related unit. This table establishes a relation between the subtype
181 -- and the symbol.
183 package Symbol_Table is new
184 GNAT.HTable.Simple_HTable
185 (Header_Num => Symbol_Table_Range,
186 Element => String_Id,
187 No_Element => No_String,
188 Key => Entity_Id,
189 Hash => Symbol_Table_Hash,
190 Equal => "=");
192 -- The following array enumerates all contexts which may contain or
193 -- produce a dimension.
195 OK_For_Dimension : constant array (Node_Kind) of Boolean :=
196 (N_Attribute_Reference => True,
197 N_Case_Expression => True,
198 N_Expanded_Name => True,
199 N_Explicit_Dereference => True,
200 N_Defining_Identifier => True,
201 N_Function_Call => True,
202 N_Identifier => True,
203 N_If_Expression => True,
204 N_Indexed_Component => True,
205 N_Integer_Literal => True,
206 N_Op_Abs => True,
207 N_Op_Add => True,
208 N_Op_Divide => True,
209 N_Op_Expon => True,
210 N_Op_Minus => True,
211 N_Op_Mod => True,
212 N_Op_Multiply => True,
213 N_Op_Plus => True,
214 N_Op_Rem => True,
215 N_Op_Subtract => True,
216 N_Qualified_Expression => True,
217 N_Real_Literal => True,
218 N_Selected_Component => True,
219 N_Slice => True,
220 N_Type_Conversion => True,
221 N_Unchecked_Type_Conversion => True,
223 others => False);
225 -----------------------
226 -- Local Subprograms --
227 -----------------------
229 procedure Analyze_Dimension_Assignment_Statement (N : Node_Id);
230 -- Subroutine of Analyze_Dimension for assignment statement. Check that the
231 -- dimensions of the left-hand side and the right-hand side of N match.
233 procedure Analyze_Dimension_Binary_Op (N : Node_Id);
234 -- Subroutine of Analyze_Dimension for binary operators. Check the
235 -- dimensions of the right and the left operand permit the operation.
236 -- Then, evaluate the resulting dimensions for each binary operator.
238 procedure Analyze_Dimension_Component_Declaration (N : Node_Id);
239 -- Subroutine of Analyze_Dimension for component declaration. Check that
240 -- the dimensions of the type of N and of the expression match.
242 procedure Analyze_Dimension_Extended_Return_Statement (N : Node_Id);
243 -- Subroutine of Analyze_Dimension for extended return statement. Check
244 -- that the dimensions of the returned type and of the returned object
245 -- match.
247 procedure Analyze_Dimension_Has_Etype (N : Node_Id);
248 -- Subroutine of Analyze_Dimension for a subset of N_Has_Etype denoted by
249 -- the list below:
250 -- N_Attribute_Reference
251 -- N_Identifier
252 -- N_Indexed_Component
253 -- N_Qualified_Expression
254 -- N_Selected_Component
255 -- N_Slice
256 -- N_Type_Conversion
257 -- N_Unchecked_Type_Conversion
259 procedure Analyze_Dimension_Case_Expression (N : Node_Id);
260 -- Verify that all alternatives have the same dimension
262 procedure Analyze_Dimension_If_Expression (N : Node_Id);
263 -- Verify that all alternatives have the same dimension
265 procedure Analyze_Dimension_Number_Declaration (N : Node_Id);
266 -- Procedure to analyze dimension of expression in a number declaration.
267 -- This allows a named number to have nontrivial dimensions, while by
268 -- default a named number is dimensionless.
270 procedure Analyze_Dimension_Object_Declaration (N : Node_Id);
271 -- Subroutine of Analyze_Dimension for object declaration. Check that
272 -- the dimensions of the object type and the dimensions of the expression
273 -- (if expression is present) match. Note that when the expression is
274 -- a literal, no error is returned. This special case allows object
275 -- declaration such as: m : constant Length := 1.0;
277 procedure Analyze_Dimension_Object_Renaming_Declaration (N : Node_Id);
278 -- Subroutine of Analyze_Dimension for object renaming declaration. Check
279 -- the dimensions of the type and of the renamed object name of N match.
281 procedure Analyze_Dimension_Simple_Return_Statement (N : Node_Id);
282 -- Subroutine of Analyze_Dimension for simple return statement
283 -- Check that the dimensions of the returned type and of the returned
284 -- expression match.
286 procedure Analyze_Dimension_Subtype_Declaration (N : Node_Id);
287 -- Subroutine of Analyze_Dimension for subtype declaration. Propagate the
288 -- dimensions from the parent type to the identifier of N. Note that if
289 -- both the identifier and the parent type of N are not dimensionless,
290 -- return an error.
292 procedure Analyze_Dimension_Type_Conversion (N : Node_Id);
293 -- Type conversions handle conversions between literals and dimensioned
294 -- types, from dimensioned types to their base type, and between different
295 -- dimensioned systems. Dimensions of the conversion are obtained either
296 -- from those of the expression, or from the target type, and dimensional
297 -- consistency must be checked when converting between values belonging
298 -- to different dimensioned systems.
300 procedure Analyze_Dimension_Unary_Op (N : Node_Id);
301 -- Subroutine of Analyze_Dimension for unary operators. For Plus, Minus and
302 -- Abs operators, propagate the dimensions from the operand to N.
304 function Create_Rational_From
305 (Expr : Node_Id;
306 Complain : Boolean) return Rational;
307 -- Given an arbitrary expression Expr, return a valid rational if Expr can
308 -- be interpreted as a rational. Otherwise return No_Rational and also an
309 -- error message if Complain is set to True.
311 function Dimensions_Of (N : Node_Id) return Dimension_Type;
312 -- Return the dimension vector of node N
314 function Dimensions_Msg_Of
315 (N : Node_Id;
316 Description_Needed : Boolean := False) return String;
317 -- Given a node N, return the dimension symbols of N, preceded by "has
318 -- dimension" if Description_Needed. if N is dimensionless, return "'[']",
319 -- or "is dimensionless" if Description_Needed.
321 function Dimension_System_Root (T : Entity_Id) return Entity_Id;
322 -- Given a type that has dimension information, return the type that is the
323 -- root of its dimension system, e.g. Mks_Type. If T is not a dimensioned
324 -- type, i.e. a standard numeric type, return Empty.
326 procedure Dim_Warning_For_Numeric_Literal (N : Node_Id; Typ : Entity_Id);
327 -- Issue a warning on the given numeric literal N to indicate that the
328 -- compiler made the assumption that the literal is not dimensionless
329 -- but has the dimension of Typ.
331 procedure Eval_Op_Expon_With_Rational_Exponent
332 (N : Node_Id;
333 Exponent_Value : Rational);
334 -- Evaluate the exponent it is a rational and the operand has a dimension
336 function Exists (Dim : Dimension_Type) return Boolean;
337 -- Returns True iff Dim does not denote the null dimension
339 function Exists (Str : String_Id) return Boolean;
340 -- Returns True iff Str does not denote No_String
342 function Exists (Sys : System_Type) return Boolean;
343 -- Returns True iff Sys does not denote the null system
345 function From_Dim_To_Str_Of_Dim_Symbols
346 (Dims : Dimension_Type;
347 System : System_Type;
348 In_Error_Msg : Boolean := False) return String_Id;
349 -- Given a dimension vector and a dimension system, return the proper
350 -- string of dimension symbols. If In_Error_Msg is True (i.e. the String_Id
351 -- will be used to issue an error message) then this routine has a special
352 -- handling for the insertion characters * or [ which must be preceded by
353 -- a quote ' to be placed literally into the message.
355 function From_Dim_To_Str_Of_Unit_Symbols
356 (Dims : Dimension_Type;
357 System : System_Type) return String_Id;
358 -- Given a dimension vector and a dimension system, return the proper
359 -- string of unit symbols.
361 function Is_Dim_IO_Package_Entity (E : Entity_Id) return Boolean;
362 -- Return True if E is the package entity of System.Dim.Float_IO or
363 -- System.Dim.Integer_IO.
365 function Is_Invalid (Position : Dimension_Position) return Boolean;
366 -- Return True if Pos denotes the invalid position
368 procedure Move_Dimensions (From : Node_Id; To : Node_Id);
369 -- Copy dimension vector of From to To and delete dimension vector of From
371 procedure Remove_Dimensions (N : Node_Id);
372 -- Remove the dimension vector of node N
374 procedure Set_Dimensions (N : Node_Id; Val : Dimension_Type);
375 -- Associate a dimension vector with a node
377 procedure Set_Symbol (E : Entity_Id; Val : String_Id);
378 -- Associate a symbol representation of a dimension vector with a subtype
380 function String_From_Numeric_Literal (N : Node_Id) return String_Id;
381 -- Return the string that corresponds to the numeric litteral N as it
382 -- appears in the source.
384 function Symbol_Of (E : Entity_Id) return String_Id;
385 -- E denotes a subtype with a dimension. Return the symbol representation
386 -- of the dimension vector.
388 function System_Of (E : Entity_Id) return System_Type;
389 -- E denotes a type, return associated system of the type if it has one
391 ---------
392 -- "+" --
393 ---------
395 function "+" (Right : Whole) return Rational is
396 begin
397 return Rational'(Numerator => Right, Denominator => 1);
398 end "+";
400 function "+" (Left, Right : Rational) return Rational is
401 R : constant Rational :=
402 Rational'(Numerator => Left.Numerator * Right.Denominator +
403 Left.Denominator * Right.Numerator,
404 Denominator => Left.Denominator * Right.Denominator);
405 begin
406 return Reduce (R);
407 end "+";
409 ---------
410 -- "-" --
411 ---------
413 function "-" (Right : Rational) return Rational is
414 begin
415 return Rational'(Numerator => -Right.Numerator,
416 Denominator => Right.Denominator);
417 end "-";
419 function "-" (Left, Right : Rational) return Rational is
420 R : constant Rational :=
421 Rational'(Numerator => Left.Numerator * Right.Denominator -
422 Left.Denominator * Right.Numerator,
423 Denominator => Left.Denominator * Right.Denominator);
425 begin
426 return Reduce (R);
427 end "-";
429 ---------
430 -- "*" --
431 ---------
433 function "*" (Left, Right : Rational) return Rational is
434 R : constant Rational :=
435 Rational'(Numerator => Left.Numerator * Right.Numerator,
436 Denominator => Left.Denominator * Right.Denominator);
437 begin
438 return Reduce (R);
439 end "*";
441 ---------
442 -- "/" --
443 ---------
445 function "/" (Left, Right : Rational) return Rational is
446 R : constant Rational := abs Right;
447 L : Rational := Left;
449 begin
450 if Right.Numerator < 0 then
451 L.Numerator := Whole (-Integer (L.Numerator));
452 end if;
454 return Reduce (Rational'(Numerator => L.Numerator * R.Denominator,
455 Denominator => L.Denominator * R.Numerator));
456 end "/";
458 -----------
459 -- "abs" --
460 -----------
462 function "abs" (Right : Rational) return Rational is
463 begin
464 return Rational'(Numerator => abs Right.Numerator,
465 Denominator => Right.Denominator);
466 end "abs";
468 ------------------------------
469 -- Analyze_Aspect_Dimension --
470 ------------------------------
472 -- with Dimension =>
473 -- ([Symbol =>] SYMBOL, DIMENSION_VALUE {, DIMENSION_Value})
475 -- SYMBOL ::= STRING_LITERAL | CHARACTER_LITERAL
477 -- DIMENSION_VALUE ::=
478 -- RATIONAL
479 -- | others => RATIONAL
480 -- | DISCRETE_CHOICE_LIST => RATIONAL
482 -- RATIONAL ::= [-] NUMERIC_LITERAL [/ NUMERIC_LITERAL]
484 -- Note that when the dimensioned type is an integer type, then any
485 -- dimension value must be an integer literal.
487 procedure Analyze_Aspect_Dimension
488 (N : Node_Id;
489 Id : Entity_Id;
490 Aggr : Node_Id)
492 Def_Id : constant Entity_Id := Defining_Identifier (N);
494 Processed : array (Dimension_Type'Range) of Boolean := (others => False);
495 -- This array is used when processing ranges or Others_Choice as part of
496 -- the dimension aggregate.
498 Dimensions : Dimension_Type := Null_Dimension;
500 procedure Extract_Power
501 (Expr : Node_Id;
502 Position : Dimension_Position);
503 -- Given an expression with denotes a rational number, read the number
504 -- and associate it with Position in Dimensions.
506 function Position_In_System
507 (Id : Node_Id;
508 System : System_Type) return Dimension_Position;
509 -- Given an identifier which denotes a dimension, return the position of
510 -- that dimension within System.
512 -------------------
513 -- Extract_Power --
514 -------------------
516 procedure Extract_Power
517 (Expr : Node_Id;
518 Position : Dimension_Position)
520 begin
521 Dimensions (Position) := Create_Rational_From (Expr, True);
522 Processed (Position) := True;
524 -- If the dimensioned root type is an integer type, it is not
525 -- particularly useful, and fractional dimensions do not make
526 -- much sense for such types, so previously we used to reject
527 -- dimensions of integer types that were not integer literals.
528 -- However, the manipulation of dimensions does not depend on
529 -- the kind of root type, so we can accept this usage for rare
530 -- cases where dimensions are specified for integer values.
532 end Extract_Power;
534 ------------------------
535 -- Position_In_System --
536 ------------------------
538 function Position_In_System
539 (Id : Node_Id;
540 System : System_Type) return Dimension_Position
542 Dimension_Name : constant Name_Id := Chars (Id);
544 begin
545 for Position in System.Unit_Names'Range loop
546 if Dimension_Name = System.Unit_Names (Position) then
547 return Position;
548 end if;
549 end loop;
551 return Invalid_Position;
552 end Position_In_System;
554 -- Local variables
556 Assoc : Node_Id;
557 Choice : Node_Id;
558 Expr : Node_Id;
559 Num_Choices : Nat := 0;
560 Num_Dimensions : Nat := 0;
561 Others_Seen : Boolean := False;
562 Position : Nat := 0;
563 Sub_Ind : Node_Id;
564 Symbol : String_Id := No_String;
565 Symbol_Expr : Node_Id;
566 System : System_Type;
567 Typ : Entity_Id;
569 Errors_Count : Nat;
570 -- Errors_Count is a count of errors detected by the compiler so far
571 -- just before the extraction of symbol, names and values in the
572 -- aggregate (Step 2).
574 -- At the end of the analysis, there is a check to verify that this
575 -- count equals to Serious_Errors_Detected i.e. no erros have been
576 -- encountered during the process. Otherwise the Dimension_Table is
577 -- not filled.
579 -- Start of processing for Analyze_Aspect_Dimension
581 begin
582 -- STEP 1: Legality of aspect
584 if Nkind (N) /= N_Subtype_Declaration then
585 Error_Msg_NE ("aspect& must apply to subtype declaration", N, Id);
586 return;
587 end if;
589 Sub_Ind := Subtype_Indication (N);
590 Typ := Etype (Sub_Ind);
591 System := System_Of (Typ);
593 if Nkind (Sub_Ind) = N_Subtype_Indication then
594 Error_Msg_NE
595 ("constraint not allowed with aspect&", Constraint (Sub_Ind), Id);
596 return;
597 end if;
599 -- The dimension declarations are useless if the parent type does not
600 -- declare a valid system.
602 if not Exists (System) then
603 Error_Msg_NE
604 ("parent type of& lacks dimension system", Sub_Ind, Def_Id);
605 return;
606 end if;
608 if Nkind (Aggr) /= N_Aggregate then
609 Error_Msg_N ("aggregate expected", Aggr);
610 return;
611 end if;
613 -- STEP 2: Symbol, Names and values extraction
615 -- Get the number of errors detected by the compiler so far
617 Errors_Count := Serious_Errors_Detected;
619 -- STEP 2a: Symbol extraction
621 -- The first entry in the aggregate may be the symbolic representation
622 -- of the quantity.
624 -- Positional symbol argument
626 Symbol_Expr := First (Expressions (Aggr));
628 -- Named symbol argument
630 if No (Symbol_Expr)
631 or else not Nkind_In (Symbol_Expr, N_Character_Literal,
632 N_String_Literal)
633 then
634 Symbol_Expr := Empty;
636 -- Component associations present
638 if Present (Component_Associations (Aggr)) then
639 Assoc := First (Component_Associations (Aggr));
640 Choice := First (Choices (Assoc));
642 if No (Next (Choice)) and then Nkind (Choice) = N_Identifier then
644 -- Symbol component association is present
646 if Chars (Choice) = Name_Symbol then
647 Num_Choices := Num_Choices + 1;
648 Symbol_Expr := Expression (Assoc);
650 -- Verify symbol expression is a string or a character
652 if not Nkind_In (Symbol_Expr, N_Character_Literal,
653 N_String_Literal)
654 then
655 Symbol_Expr := Empty;
656 Error_Msg_N
657 ("symbol expression must be character or string",
658 Symbol_Expr);
659 end if;
661 -- Special error if no Symbol choice but expression is string
662 -- or character.
664 elsif Nkind_In (Expression (Assoc), N_Character_Literal,
665 N_String_Literal)
666 then
667 Num_Choices := Num_Choices + 1;
668 Error_Msg_N
669 ("optional component Symbol expected, found&", Choice);
670 end if;
671 end if;
672 end if;
673 end if;
675 -- STEP 2b: Names and values extraction
677 -- Positional elements
679 Expr := First (Expressions (Aggr));
681 -- Skip the symbol expression when present
683 if Present (Symbol_Expr) and then Num_Choices = 0 then
684 Expr := Next (Expr);
685 end if;
687 Position := Low_Position_Bound;
688 while Present (Expr) loop
689 if Position > High_Position_Bound then
690 Error_Msg_N
691 ("type& has more dimensions than system allows", Def_Id);
692 exit;
693 end if;
695 Extract_Power (Expr, Position);
697 Position := Position + 1;
698 Num_Dimensions := Num_Dimensions + 1;
700 Next (Expr);
701 end loop;
703 -- Named elements
705 Assoc := First (Component_Associations (Aggr));
707 -- Skip the symbol association when present
709 if Num_Choices = 1 then
710 Next (Assoc);
711 end if;
713 while Present (Assoc) loop
714 Expr := Expression (Assoc);
716 Choice := First (Choices (Assoc));
717 while Present (Choice) loop
719 -- Identifier case: NAME => EXPRESSION
721 if Nkind (Choice) = N_Identifier then
722 Position := Position_In_System (Choice, System);
724 if Is_Invalid (Position) then
725 Error_Msg_N ("dimension name& not part of system", Choice);
726 else
727 Extract_Power (Expr, Position);
728 end if;
730 -- Range case: NAME .. NAME => EXPRESSION
732 elsif Nkind (Choice) = N_Range then
733 declare
734 Low : constant Node_Id := Low_Bound (Choice);
735 High : constant Node_Id := High_Bound (Choice);
736 Low_Pos : Dimension_Position;
737 High_Pos : Dimension_Position;
739 begin
740 if Nkind (Low) /= N_Identifier then
741 Error_Msg_N ("bound must denote a dimension name", Low);
743 elsif Nkind (High) /= N_Identifier then
744 Error_Msg_N ("bound must denote a dimension name", High);
746 else
747 Low_Pos := Position_In_System (Low, System);
748 High_Pos := Position_In_System (High, System);
750 if Is_Invalid (Low_Pos) then
751 Error_Msg_N ("dimension name& not part of system",
752 Low);
754 elsif Is_Invalid (High_Pos) then
755 Error_Msg_N ("dimension name& not part of system",
756 High);
758 elsif Low_Pos > High_Pos then
759 Error_Msg_N ("expected low to high range", Choice);
761 else
762 for Position in Low_Pos .. High_Pos loop
763 Extract_Power (Expr, Position);
764 end loop;
765 end if;
766 end if;
767 end;
769 -- Others case: OTHERS => EXPRESSION
771 elsif Nkind (Choice) = N_Others_Choice then
772 if Present (Next (Choice)) or else Present (Prev (Choice)) then
773 Error_Msg_N
774 ("OTHERS must appear alone in a choice list", Choice);
776 elsif Present (Next (Assoc)) then
777 Error_Msg_N
778 ("OTHERS must appear last in an aggregate", Choice);
780 elsif Others_Seen then
781 Error_Msg_N ("multiple OTHERS not allowed", Choice);
783 else
784 -- Fill the non-processed dimensions with the default value
785 -- supplied by others.
787 for Position in Processed'Range loop
788 if not Processed (Position) then
789 Extract_Power (Expr, Position);
790 end if;
791 end loop;
792 end if;
794 Others_Seen := True;
796 -- All other cases are illegal declarations of dimension names
798 else
799 Error_Msg_NE ("wrong syntax for aspect&", Choice, Id);
800 end if;
802 Num_Choices := Num_Choices + 1;
803 Next (Choice);
804 end loop;
806 Num_Dimensions := Num_Dimensions + 1;
807 Next (Assoc);
808 end loop;
810 -- STEP 3: Consistency of system and dimensions
812 if Present (First (Expressions (Aggr)))
813 and then (First (Expressions (Aggr)) /= Symbol_Expr
814 or else Present (Next (Symbol_Expr)))
815 and then (Num_Choices > 1
816 or else (Num_Choices = 1 and then not Others_Seen))
817 then
818 Error_Msg_N
819 ("named associations cannot follow positional associations", Aggr);
820 end if;
822 if Num_Dimensions > System.Count then
823 Error_Msg_N ("type& has more dimensions than system allows", Def_Id);
825 elsif Num_Dimensions < System.Count and then not Others_Seen then
826 Error_Msg_N ("type& has less dimensions than system allows", Def_Id);
827 end if;
829 -- STEP 4: Dimension symbol extraction
831 if Present (Symbol_Expr) then
832 if Nkind (Symbol_Expr) = N_Character_Literal then
833 Start_String;
834 Store_String_Char (UI_To_CC (Char_Literal_Value (Symbol_Expr)));
835 Symbol := End_String;
837 else
838 Symbol := Strval (Symbol_Expr);
839 end if;
841 if String_Length (Symbol) = 0 then
842 Error_Msg_N ("empty string not allowed here", Symbol_Expr);
843 end if;
844 end if;
846 -- STEP 5: Storage of extracted values
848 -- Check that no errors have been detected during the analysis
850 if Errors_Count = Serious_Errors_Detected then
852 -- Check for useless declaration
854 if Symbol = No_String and then not Exists (Dimensions) then
855 Error_Msg_N ("useless dimension declaration", Aggr);
856 end if;
858 if Symbol /= No_String then
859 Set_Symbol (Def_Id, Symbol);
860 end if;
862 if Exists (Dimensions) then
863 Set_Dimensions (Def_Id, Dimensions);
864 end if;
865 end if;
866 end Analyze_Aspect_Dimension;
868 -------------------------------------
869 -- Analyze_Aspect_Dimension_System --
870 -------------------------------------
872 -- with Dimension_System => (DIMENSION {, DIMENSION});
874 -- DIMENSION ::= (
875 -- [Unit_Name =>] IDENTIFIER,
876 -- [Unit_Symbol =>] SYMBOL,
877 -- [Dim_Symbol =>] SYMBOL)
879 procedure Analyze_Aspect_Dimension_System
880 (N : Node_Id;
881 Id : Entity_Id;
882 Aggr : Node_Id)
884 function Is_Derived_Numeric_Type (N : Node_Id) return Boolean;
885 -- Determine whether type declaration N denotes a numeric derived type
887 -------------------------------
888 -- Is_Derived_Numeric_Type --
889 -------------------------------
891 function Is_Derived_Numeric_Type (N : Node_Id) return Boolean is
892 begin
893 return
894 Nkind (N) = N_Full_Type_Declaration
895 and then Nkind (Type_Definition (N)) = N_Derived_Type_Definition
896 and then Is_Numeric_Type
897 (Entity (Subtype_Indication (Type_Definition (N))));
898 end Is_Derived_Numeric_Type;
900 -- Local variables
902 Assoc : Node_Id;
903 Choice : Node_Id;
904 Dim_Aggr : Node_Id;
905 Dim_Symbol : Node_Id;
906 Dim_Symbols : Symbol_Array := No_Symbols;
907 Dim_System : System_Type := Null_System;
908 Position : Dimension_Position := Invalid_Position;
909 Unit_Name : Node_Id;
910 Unit_Names : Name_Array := No_Names;
911 Unit_Symbol : Node_Id;
912 Unit_Symbols : Symbol_Array := No_Symbols;
914 Errors_Count : Nat;
915 -- Errors_Count is a count of errors detected by the compiler so far
916 -- just before the extraction of names and symbols in the aggregate
917 -- (Step 3).
919 -- At the end of the analysis, there is a check to verify that this
920 -- count equals Serious_Errors_Detected i.e. no errors have been
921 -- encountered during the process. Otherwise the System_Table is
922 -- not filled.
924 -- Start of processing for Analyze_Aspect_Dimension_System
926 begin
927 -- STEP 1: Legality of aspect
929 if not Is_Derived_Numeric_Type (N) then
930 Error_Msg_NE
931 ("aspect& must apply to numeric derived type declaration", N, Id);
932 return;
933 end if;
935 if Nkind (Aggr) /= N_Aggregate then
936 Error_Msg_N ("aggregate expected", Aggr);
937 return;
938 end if;
940 -- STEP 2: Structural verification of the dimension aggregate
942 if Present (Component_Associations (Aggr)) then
943 Error_Msg_N ("expected positional aggregate", Aggr);
944 return;
945 end if;
947 -- STEP 3: Name and Symbol extraction
949 Dim_Aggr := First (Expressions (Aggr));
950 Errors_Count := Serious_Errors_Detected;
951 while Present (Dim_Aggr) loop
952 if Position = High_Position_Bound then
953 Error_Msg_N ("too many dimensions in system", Aggr);
954 exit;
955 end if;
957 Position := Position + 1;
959 if Nkind (Dim_Aggr) /= N_Aggregate then
960 Error_Msg_N ("aggregate expected", Dim_Aggr);
962 else
963 if Present (Component_Associations (Dim_Aggr))
964 and then Present (Expressions (Dim_Aggr))
965 then
966 Error_Msg_N
967 ("mixed positional/named aggregate not allowed here",
968 Dim_Aggr);
970 -- Verify each dimension aggregate has three arguments
972 elsif List_Length (Component_Associations (Dim_Aggr)) /= 3
973 and then List_Length (Expressions (Dim_Aggr)) /= 3
974 then
975 Error_Msg_N
976 ("three components expected in aggregate", Dim_Aggr);
978 else
979 -- Named dimension aggregate
981 if Present (Component_Associations (Dim_Aggr)) then
983 -- Check first argument denotes the unit name
985 Assoc := First (Component_Associations (Dim_Aggr));
986 Choice := First (Choices (Assoc));
987 Unit_Name := Expression (Assoc);
989 if Present (Next (Choice))
990 or else Nkind (Choice) /= N_Identifier
991 then
992 Error_Msg_NE ("wrong syntax for aspect&", Choice, Id);
994 elsif Chars (Choice) /= Name_Unit_Name then
995 Error_Msg_N ("expected Unit_Name, found&", Choice);
996 end if;
998 -- Check the second argument denotes the unit symbol
1000 Next (Assoc);
1001 Choice := First (Choices (Assoc));
1002 Unit_Symbol := Expression (Assoc);
1004 if Present (Next (Choice))
1005 or else Nkind (Choice) /= N_Identifier
1006 then
1007 Error_Msg_NE ("wrong syntax for aspect&", Choice, Id);
1009 elsif Chars (Choice) /= Name_Unit_Symbol then
1010 Error_Msg_N ("expected Unit_Symbol, found&", Choice);
1011 end if;
1013 -- Check the third argument denotes the dimension symbol
1015 Next (Assoc);
1016 Choice := First (Choices (Assoc));
1017 Dim_Symbol := Expression (Assoc);
1019 if Present (Next (Choice))
1020 or else Nkind (Choice) /= N_Identifier
1021 then
1022 Error_Msg_NE ("wrong syntax for aspect&", Choice, Id);
1023 elsif Chars (Choice) /= Name_Dim_Symbol then
1024 Error_Msg_N ("expected Dim_Symbol, found&", Choice);
1025 end if;
1027 -- Positional dimension aggregate
1029 else
1030 Unit_Name := First (Expressions (Dim_Aggr));
1031 Unit_Symbol := Next (Unit_Name);
1032 Dim_Symbol := Next (Unit_Symbol);
1033 end if;
1035 -- Check the first argument for each dimension aggregate is
1036 -- a name.
1038 if Nkind (Unit_Name) = N_Identifier then
1039 Unit_Names (Position) := Chars (Unit_Name);
1040 else
1041 Error_Msg_N ("expected unit name", Unit_Name);
1042 end if;
1044 -- Check the second argument for each dimension aggregate is
1045 -- a string or a character.
1047 if not Nkind_In (Unit_Symbol, N_String_Literal,
1048 N_Character_Literal)
1049 then
1050 Error_Msg_N
1051 ("expected unit symbol (string or character)",
1052 Unit_Symbol);
1054 else
1055 -- String case
1057 if Nkind (Unit_Symbol) = N_String_Literal then
1058 Unit_Symbols (Position) := Strval (Unit_Symbol);
1060 -- Character case
1062 else
1063 Start_String;
1064 Store_String_Char
1065 (UI_To_CC (Char_Literal_Value (Unit_Symbol)));
1066 Unit_Symbols (Position) := End_String;
1067 end if;
1069 -- Verify that the string is not empty
1071 if String_Length (Unit_Symbols (Position)) = 0 then
1072 Error_Msg_N
1073 ("empty string not allowed here", Unit_Symbol);
1074 end if;
1075 end if;
1077 -- Check the third argument for each dimension aggregate is
1078 -- a string or a character.
1080 if not Nkind_In (Dim_Symbol, N_String_Literal,
1081 N_Character_Literal)
1082 then
1083 Error_Msg_N
1084 ("expected dimension symbol (string or character)",
1085 Dim_Symbol);
1087 else
1088 -- String case
1090 if Nkind (Dim_Symbol) = N_String_Literal then
1091 Dim_Symbols (Position) := Strval (Dim_Symbol);
1093 -- Character case
1095 else
1096 Start_String;
1097 Store_String_Char
1098 (UI_To_CC (Char_Literal_Value (Dim_Symbol)));
1099 Dim_Symbols (Position) := End_String;
1100 end if;
1102 -- Verify that the string is not empty
1104 if String_Length (Dim_Symbols (Position)) = 0 then
1105 Error_Msg_N ("empty string not allowed here", Dim_Symbol);
1106 end if;
1107 end if;
1108 end if;
1109 end if;
1111 Next (Dim_Aggr);
1112 end loop;
1114 -- STEP 4: Storage of extracted values
1116 -- Check that no errors have been detected during the analysis
1118 if Errors_Count = Serious_Errors_Detected then
1119 Dim_System.Type_Decl := N;
1120 Dim_System.Unit_Names := Unit_Names;
1121 Dim_System.Unit_Symbols := Unit_Symbols;
1122 Dim_System.Dim_Symbols := Dim_Symbols;
1123 Dim_System.Count := Position;
1124 System_Table.Append (Dim_System);
1125 end if;
1126 end Analyze_Aspect_Dimension_System;
1128 -----------------------
1129 -- Analyze_Dimension --
1130 -----------------------
1132 -- This dispatch routine propagates dimensions for each node
1134 procedure Analyze_Dimension (N : Node_Id) is
1135 begin
1136 -- Aspect is an Ada 2012 feature. Note that there is no need to check
1137 -- dimensions for nodes that don't come from source, except for subtype
1138 -- declarations where the dimensions are inherited from the base type,
1139 -- for explicit dereferences generated when expanding iterators, and
1140 -- for object declarations generated for inlining.
1142 if Ada_Version < Ada_2012 then
1143 return;
1145 elsif not Comes_From_Source (N) then
1146 if Nkind_In (N, N_Explicit_Dereference,
1147 N_Identifier,
1148 N_Object_Declaration,
1149 N_Subtype_Declaration)
1150 then
1151 null;
1152 else
1153 return;
1154 end if;
1155 end if;
1157 case Nkind (N) is
1158 when N_Assignment_Statement =>
1159 Analyze_Dimension_Assignment_Statement (N);
1161 when N_Binary_Op =>
1162 Analyze_Dimension_Binary_Op (N);
1164 when N_Case_Expression =>
1165 Analyze_Dimension_Case_Expression (N);
1167 when N_Component_Declaration =>
1168 Analyze_Dimension_Component_Declaration (N);
1170 when N_Extended_Return_Statement =>
1171 Analyze_Dimension_Extended_Return_Statement (N);
1173 when N_Attribute_Reference
1174 | N_Expanded_Name
1175 | N_Explicit_Dereference
1176 | N_Function_Call
1177 | N_Indexed_Component
1178 | N_Qualified_Expression
1179 | N_Selected_Component
1180 | N_Slice
1181 | N_Unchecked_Type_Conversion
1183 Analyze_Dimension_Has_Etype (N);
1185 -- In the presence of a repaired syntax error, an identifier may be
1186 -- introduced without a usable type.
1188 when N_Identifier =>
1189 if Present (Etype (N)) then
1190 Analyze_Dimension_Has_Etype (N);
1191 end if;
1193 when N_If_Expression =>
1194 Analyze_Dimension_If_Expression (N);
1196 when N_Number_Declaration =>
1197 Analyze_Dimension_Number_Declaration (N);
1199 when N_Object_Declaration =>
1200 Analyze_Dimension_Object_Declaration (N);
1202 when N_Object_Renaming_Declaration =>
1203 Analyze_Dimension_Object_Renaming_Declaration (N);
1205 when N_Simple_Return_Statement =>
1206 if not Comes_From_Extended_Return_Statement (N) then
1207 Analyze_Dimension_Simple_Return_Statement (N);
1208 end if;
1210 when N_Subtype_Declaration =>
1211 Analyze_Dimension_Subtype_Declaration (N);
1213 when N_Type_Conversion =>
1214 Analyze_Dimension_Type_Conversion (N);
1216 when N_Unary_Op =>
1217 Analyze_Dimension_Unary_Op (N);
1219 when others =>
1220 null;
1221 end case;
1222 end Analyze_Dimension;
1224 ---------------------------------------
1225 -- Analyze_Dimension_Array_Aggregate --
1226 ---------------------------------------
1228 procedure Analyze_Dimension_Array_Aggregate
1229 (N : Node_Id;
1230 Comp_Typ : Entity_Id)
1232 Comp_Ass : constant List_Id := Component_Associations (N);
1233 Dims_Of_Comp_Typ : constant Dimension_Type := Dimensions_Of (Comp_Typ);
1234 Exps : constant List_Id := Expressions (N);
1236 Comp : Node_Id;
1237 Expr : Node_Id;
1239 Error_Detected : Boolean := False;
1240 -- This flag is used in order to indicate if an error has been detected
1241 -- so far by the compiler in this routine.
1243 begin
1244 -- Aspect is an Ada 2012 feature. Nothing to do here if the component
1245 -- base type is not a dimensioned type.
1247 -- Note that here the original node must come from source since the
1248 -- original array aggregate may not have been entirely decorated.
1250 if Ada_Version < Ada_2012
1251 or else not Comes_From_Source (Original_Node (N))
1252 or else not Has_Dimension_System (Base_Type (Comp_Typ))
1253 then
1254 return;
1255 end if;
1257 -- Check whether there is any positional component association
1259 if Is_Empty_List (Exps) then
1260 Comp := First (Comp_Ass);
1261 else
1262 Comp := First (Exps);
1263 end if;
1265 while Present (Comp) loop
1267 -- Get the expression from the component
1269 if Nkind (Comp) = N_Component_Association then
1270 Expr := Expression (Comp);
1271 else
1272 Expr := Comp;
1273 end if;
1275 -- Issue an error if the dimensions of the component type and the
1276 -- dimensions of the component mismatch.
1278 -- Note that we must ensure the expression has been fully analyzed
1279 -- since it may not be decorated at this point. We also don't want to
1280 -- issue the same error message multiple times on the same expression
1281 -- (may happen when an aggregate is converted into a positional
1282 -- aggregate). We also must verify that this is a scalar component,
1283 -- and not a subaggregate of a multidimensional aggregate.
1285 if Comes_From_Source (Original_Node (Expr))
1286 and then Present (Etype (Expr))
1287 and then Is_Numeric_Type (Etype (Expr))
1288 and then Dimensions_Of (Expr) /= Dims_Of_Comp_Typ
1289 and then Sloc (Comp) /= Sloc (Prev (Comp))
1290 then
1291 -- Check if an error has already been encountered so far
1293 if not Error_Detected then
1294 Error_Msg_N ("dimensions mismatch in array aggregate", N);
1295 Error_Detected := True;
1296 end if;
1298 Error_Msg_N
1299 ("\expected dimension " & Dimensions_Msg_Of (Comp_Typ)
1300 & ", found " & Dimensions_Msg_Of (Expr), Expr);
1301 end if;
1303 -- Look at the named components right after the positional components
1305 if not Present (Next (Comp))
1306 and then List_Containing (Comp) = Exps
1307 then
1308 Comp := First (Comp_Ass);
1309 else
1310 Next (Comp);
1311 end if;
1312 end loop;
1313 end Analyze_Dimension_Array_Aggregate;
1315 --------------------------------------------
1316 -- Analyze_Dimension_Assignment_Statement --
1317 --------------------------------------------
1319 procedure Analyze_Dimension_Assignment_Statement (N : Node_Id) is
1320 Lhs : constant Node_Id := Name (N);
1321 Dims_Of_Lhs : constant Dimension_Type := Dimensions_Of (Lhs);
1322 Rhs : constant Node_Id := Expression (N);
1323 Dims_Of_Rhs : constant Dimension_Type := Dimensions_Of (Rhs);
1325 procedure Error_Dim_Msg_For_Assignment_Statement
1326 (N : Node_Id;
1327 Lhs : Node_Id;
1328 Rhs : Node_Id);
1329 -- Error using Error_Msg_N at node N. Output the dimensions of left
1330 -- and right hand sides.
1332 --------------------------------------------
1333 -- Error_Dim_Msg_For_Assignment_Statement --
1334 --------------------------------------------
1336 procedure Error_Dim_Msg_For_Assignment_Statement
1337 (N : Node_Id;
1338 Lhs : Node_Id;
1339 Rhs : Node_Id)
1341 begin
1342 Error_Msg_N ("dimensions mismatch in assignment", N);
1343 Error_Msg_N ("\left-hand side " & Dimensions_Msg_Of (Lhs, True), N);
1344 Error_Msg_N ("\right-hand side " & Dimensions_Msg_Of (Rhs, True), N);
1345 end Error_Dim_Msg_For_Assignment_Statement;
1347 -- Start of processing for Analyze_Dimension_Assignment
1349 begin
1350 if Dims_Of_Lhs /= Dims_Of_Rhs then
1351 Error_Dim_Msg_For_Assignment_Statement (N, Lhs, Rhs);
1352 end if;
1353 end Analyze_Dimension_Assignment_Statement;
1355 ---------------------------------
1356 -- Analyze_Dimension_Binary_Op --
1357 ---------------------------------
1359 -- Check and propagate the dimensions for binary operators
1360 -- Note that when the dimensions mismatch, no dimension is propagated to N.
1362 procedure Analyze_Dimension_Binary_Op (N : Node_Id) is
1363 N_Kind : constant Node_Kind := Nkind (N);
1365 function Dimensions_Of_Operand (N : Node_Id) return Dimension_Type;
1366 -- If the operand is a numeric literal that comes from a declared
1367 -- constant, use the dimensions of the constant which were computed
1368 -- from the expression of the constant declaration. Otherwise the
1369 -- dimensions are those of the operand, or the type of the operand.
1370 -- This takes care of node rewritings from validity checks, where the
1371 -- dimensions of the operand itself may not be preserved, while the
1372 -- type comes from context and must have dimension information.
1374 procedure Error_Dim_Msg_For_Binary_Op (N, L, R : Node_Id);
1375 -- Error using Error_Msg_NE and Error_Msg_N at node N. Output the
1376 -- dimensions of both operands.
1378 ---------------------------
1379 -- Dimensions_Of_Operand --
1380 ---------------------------
1382 function Dimensions_Of_Operand (N : Node_Id) return Dimension_Type is
1383 Dims : constant Dimension_Type := Dimensions_Of (N);
1385 begin
1386 if Exists (Dims) then
1387 return Dims;
1389 elsif Is_Entity_Name (N) then
1390 return Dimensions_Of (Etype (Entity (N)));
1392 elsif Nkind (N) = N_Real_Literal then
1394 if Present (Original_Entity (N)) then
1395 return Dimensions_Of (Original_Entity (N));
1397 else
1398 return Dimensions_Of (Etype (N));
1399 end if;
1401 -- Otherwise return the default dimensions
1403 else
1404 return Dims;
1405 end if;
1406 end Dimensions_Of_Operand;
1408 ---------------------------------
1409 -- Error_Dim_Msg_For_Binary_Op --
1410 ---------------------------------
1412 procedure Error_Dim_Msg_For_Binary_Op (N, L, R : Node_Id) is
1413 begin
1414 Error_Msg_NE
1415 ("both operands for operation& must have same dimensions",
1416 N, Entity (N));
1417 Error_Msg_N ("\left operand " & Dimensions_Msg_Of (L, True), N);
1418 Error_Msg_N ("\right operand " & Dimensions_Msg_Of (R, True), N);
1419 end Error_Dim_Msg_For_Binary_Op;
1421 -- Start of processing for Analyze_Dimension_Binary_Op
1423 begin
1424 -- If the node is already analyzed, do not examine the operands. At the
1425 -- end of the analysis their dimensions have been removed, and the node
1426 -- itself may have been rewritten.
1428 if Analyzed (N) then
1429 return;
1430 end if;
1432 if Nkind_In (N_Kind, N_Op_Add, N_Op_Expon, N_Op_Subtract)
1433 or else N_Kind in N_Multiplying_Operator
1434 or else N_Kind in N_Op_Compare
1435 then
1436 declare
1437 L : constant Node_Id := Left_Opnd (N);
1438 Dims_Of_L : constant Dimension_Type :=
1439 Dimensions_Of_Operand (L);
1440 L_Has_Dimensions : constant Boolean := Exists (Dims_Of_L);
1441 R : constant Node_Id := Right_Opnd (N);
1442 Dims_Of_R : constant Dimension_Type :=
1443 Dimensions_Of_Operand (R);
1444 R_Has_Dimensions : constant Boolean := Exists (Dims_Of_R);
1445 Dims_Of_N : Dimension_Type := Null_Dimension;
1447 begin
1448 -- N_Op_Add, N_Op_Mod, N_Op_Rem or N_Op_Subtract case
1450 if Nkind_In (N, N_Op_Add, N_Op_Mod, N_Op_Rem, N_Op_Subtract) then
1452 -- Check both operands have same dimension
1454 if Dims_Of_L /= Dims_Of_R then
1455 Error_Dim_Msg_For_Binary_Op (N, L, R);
1456 else
1457 -- Check both operands are not dimensionless
1459 if Exists (Dims_Of_L) then
1460 Set_Dimensions (N, Dims_Of_L);
1461 end if;
1462 end if;
1464 -- N_Op_Multiply or N_Op_Divide case
1466 elsif Nkind_In (N_Kind, N_Op_Multiply, N_Op_Divide) then
1468 -- Check at least one operand is not dimensionless
1470 if L_Has_Dimensions or R_Has_Dimensions then
1472 -- Multiplication case
1474 -- Get both operands dimensions and add them
1476 if N_Kind = N_Op_Multiply then
1477 for Position in Dimension_Type'Range loop
1478 Dims_Of_N (Position) :=
1479 Dims_Of_L (Position) + Dims_Of_R (Position);
1480 end loop;
1482 -- Division case
1484 -- Get both operands dimensions and subtract them
1486 else
1487 for Position in Dimension_Type'Range loop
1488 Dims_Of_N (Position) :=
1489 Dims_Of_L (Position) - Dims_Of_R (Position);
1490 end loop;
1491 end if;
1493 if Exists (Dims_Of_N) then
1494 Set_Dimensions (N, Dims_Of_N);
1495 end if;
1496 end if;
1498 -- Exponentiation case
1500 -- Note: a rational exponent is allowed for dimensioned operand
1502 elsif N_Kind = N_Op_Expon then
1504 -- Check the left operand is not dimensionless. Note that the
1505 -- value of the exponent must be known compile time. Otherwise,
1506 -- the exponentiation evaluation will return an error message.
1508 if L_Has_Dimensions then
1509 if not Compile_Time_Known_Value (R) then
1510 Error_Msg_N
1511 ("exponent of dimensioned operand must be "
1512 & "known at compile time", N);
1513 end if;
1515 declare
1516 Exponent_Value : Rational := Zero;
1518 begin
1519 -- Real operand case
1521 if Is_Real_Type (Etype (L)) then
1523 -- Define the exponent as a Rational number
1525 Exponent_Value := Create_Rational_From (R, False);
1527 -- Verify that the exponent cannot be interpreted
1528 -- as a rational, otherwise interpret the exponent
1529 -- as an integer.
1531 if Exponent_Value = No_Rational then
1532 Exponent_Value :=
1533 +Whole (UI_To_Int (Expr_Value (R)));
1534 end if;
1536 -- Integer operand case.
1538 -- For integer operand, the exponent cannot be
1539 -- interpreted as a rational.
1541 else
1542 Exponent_Value := +Whole (UI_To_Int (Expr_Value (R)));
1543 end if;
1545 for Position in Dimension_Type'Range loop
1546 Dims_Of_N (Position) :=
1547 Dims_Of_L (Position) * Exponent_Value;
1548 end loop;
1550 if Exists (Dims_Of_N) then
1551 Set_Dimensions (N, Dims_Of_N);
1552 end if;
1553 end;
1554 end if;
1556 -- Comparison cases
1558 -- For relational operations, only dimension checking is
1559 -- performed (no propagation). If one operand is the result
1560 -- of constant folding the dimensions may have been lost
1561 -- in a tree copy, so assume that pre-analysis has verified
1562 -- that dimensions are correct.
1564 elsif N_Kind in N_Op_Compare then
1565 if (L_Has_Dimensions or R_Has_Dimensions)
1566 and then Dims_Of_L /= Dims_Of_R
1567 then
1568 if Nkind (L) = N_Real_Literal
1569 and then not (Comes_From_Source (L))
1570 and then Expander_Active
1571 then
1572 null;
1574 elsif Nkind (R) = N_Real_Literal
1575 and then not (Comes_From_Source (R))
1576 and then Expander_Active
1577 then
1578 null;
1580 -- Numeric literal case. Issue a warning to indicate the
1581 -- literal is treated as if its dimension matches the type
1582 -- dimension.
1584 elsif Nkind_In (Original_Node (L), N_Integer_Literal,
1585 N_Real_Literal)
1586 then
1587 Dim_Warning_For_Numeric_Literal (L, Etype (R));
1589 elsif Nkind_In (Original_Node (R), N_Integer_Literal,
1590 N_Real_Literal)
1591 then
1592 Dim_Warning_For_Numeric_Literal (R, Etype (L));
1594 else
1595 Error_Dim_Msg_For_Binary_Op (N, L, R);
1596 end if;
1597 end if;
1598 end if;
1600 -- If expander is active, remove dimension information from each
1601 -- operand, as only dimensions of result are relevant.
1603 if Expander_Active then
1604 Remove_Dimensions (L);
1605 Remove_Dimensions (R);
1606 end if;
1607 end;
1608 end if;
1609 end Analyze_Dimension_Binary_Op;
1611 ----------------------------
1612 -- Analyze_Dimension_Call --
1613 ----------------------------
1615 procedure Analyze_Dimension_Call (N : Node_Id; Nam : Entity_Id) is
1616 Actuals : constant List_Id := Parameter_Associations (N);
1617 Actual : Node_Id;
1618 Dims_Of_Formal : Dimension_Type;
1619 Formal : Node_Id;
1620 Formal_Typ : Entity_Id;
1622 Error_Detected : Boolean := False;
1623 -- This flag is used in order to indicate if an error has been detected
1624 -- so far by the compiler in this routine.
1626 begin
1627 -- Aspect is an Ada 2012 feature. Note that there is no need to check
1628 -- dimensions for calls that don't come from source, or those that may
1629 -- have semantic errors.
1631 if Ada_Version < Ada_2012
1632 or else not Comes_From_Source (N)
1633 or else Error_Posted (N)
1634 then
1635 return;
1636 end if;
1638 -- Check the dimensions of the actuals, if any
1640 if not Is_Empty_List (Actuals) then
1642 -- Special processing for elementary functions
1644 -- For Sqrt call, the resulting dimensions equal to half the
1645 -- dimensions of the actual. For all other elementary calls, this
1646 -- routine check that every actual is dimensionless.
1648 if Nkind (N) = N_Function_Call then
1649 Elementary_Function_Calls : declare
1650 Dims_Of_Call : Dimension_Type;
1651 Ent : Entity_Id := Nam;
1653 function Is_Elementary_Function_Entity
1654 (Sub_Id : Entity_Id) return Boolean;
1655 -- Given Sub_Id, the original subprogram entity, return True
1656 -- if call is to an elementary function (see Ada.Numerics.
1657 -- Generic_Elementary_Functions).
1659 -----------------------------------
1660 -- Is_Elementary_Function_Entity --
1661 -----------------------------------
1663 function Is_Elementary_Function_Entity
1664 (Sub_Id : Entity_Id) return Boolean
1666 Loc : constant Source_Ptr := Sloc (Sub_Id);
1668 begin
1669 -- Is entity in Ada.Numerics.Generic_Elementary_Functions?
1671 return
1672 Loc > No_Location
1673 and then
1674 Is_RTU
1675 (Cunit_Entity (Get_Source_Unit (Loc)),
1676 Ada_Numerics_Generic_Elementary_Functions);
1677 end Is_Elementary_Function_Entity;
1679 -- Start of processing for Elementary_Function_Calls
1681 begin
1682 -- Get original subprogram entity following the renaming chain
1684 if Present (Alias (Ent)) then
1685 Ent := Alias (Ent);
1686 end if;
1688 -- Check the call is an Elementary function call
1690 if Is_Elementary_Function_Entity (Ent) then
1692 -- Sqrt function call case
1694 if Chars (Ent) = Name_Sqrt then
1695 Dims_Of_Call := Dimensions_Of (First_Actual (N));
1697 -- Evaluates the resulting dimensions (i.e. half the
1698 -- dimensions of the actual).
1700 if Exists (Dims_Of_Call) then
1701 for Position in Dims_Of_Call'Range loop
1702 Dims_Of_Call (Position) :=
1703 Dims_Of_Call (Position) *
1704 Rational'(Numerator => 1, Denominator => 2);
1705 end loop;
1707 Set_Dimensions (N, Dims_Of_Call);
1708 end if;
1710 -- All other elementary functions case. Note that every
1711 -- actual here should be dimensionless.
1713 else
1714 Actual := First_Actual (N);
1715 while Present (Actual) loop
1716 if Exists (Dimensions_Of (Actual)) then
1718 -- Check if error has already been encountered
1720 if not Error_Detected then
1721 Error_Msg_NE
1722 ("dimensions mismatch in call of&",
1723 N, Name (N));
1724 Error_Detected := True;
1725 end if;
1727 Error_Msg_N
1728 ("\expected dimension '['], found "
1729 & Dimensions_Msg_Of (Actual), Actual);
1730 end if;
1732 Next_Actual (Actual);
1733 end loop;
1734 end if;
1736 -- Nothing more to do for elementary functions
1738 return;
1739 end if;
1740 end Elementary_Function_Calls;
1741 end if;
1743 -- General case. Check, for each parameter, the dimensions of the
1744 -- actual and its corresponding formal match. Otherwise, complain.
1746 Actual := First_Actual (N);
1747 Formal := First_Formal (Nam);
1748 while Present (Formal) loop
1750 -- A missing corresponding actual indicates that the analysis of
1751 -- the call was aborted due to a previous error.
1753 if No (Actual) then
1754 Check_Error_Detected;
1755 return;
1756 end if;
1758 Formal_Typ := Etype (Formal);
1759 Dims_Of_Formal := Dimensions_Of (Formal_Typ);
1761 -- If the formal is not dimensionless, check dimensions of formal
1762 -- and actual match. Otherwise, complain.
1764 if Exists (Dims_Of_Formal)
1765 and then Dimensions_Of (Actual) /= Dims_Of_Formal
1766 then
1767 -- Check if an error has already been encountered so far
1769 if not Error_Detected then
1770 Error_Msg_NE ("dimensions mismatch in& call", N, Name (N));
1771 Error_Detected := True;
1772 end if;
1774 Error_Msg_N
1775 ("\expected dimension " & Dimensions_Msg_Of (Formal_Typ)
1776 & ", found " & Dimensions_Msg_Of (Actual), Actual);
1777 end if;
1779 Next_Actual (Actual);
1780 Next_Formal (Formal);
1781 end loop;
1782 end if;
1784 -- For function calls, propagate the dimensions from the returned type
1786 if Nkind (N) = N_Function_Call then
1787 Analyze_Dimension_Has_Etype (N);
1788 end if;
1789 end Analyze_Dimension_Call;
1791 ---------------------------------------
1792 -- Analyze_Dimension_Case_Expression --
1793 ---------------------------------------
1795 procedure Analyze_Dimension_Case_Expression (N : Node_Id) is
1796 Frst : constant Node_Id := First (Alternatives (N));
1797 Frst_Expr : constant Node_Id := Expression (Frst);
1798 Dims : constant Dimension_Type := Dimensions_Of (Frst_Expr);
1800 Alt : Node_Id;
1802 begin
1803 Alt := Next (Frst);
1804 while Present (Alt) loop
1805 if Dimensions_Of (Expression (Alt)) /= Dims then
1806 Error_Msg_N ("dimension mismatch in case expression", Alt);
1807 exit;
1808 end if;
1810 Next (Alt);
1811 end loop;
1813 Copy_Dimensions (Frst_Expr, N);
1814 end Analyze_Dimension_Case_Expression;
1816 ---------------------------------------------
1817 -- Analyze_Dimension_Component_Declaration --
1818 ---------------------------------------------
1820 procedure Analyze_Dimension_Component_Declaration (N : Node_Id) is
1821 Expr : constant Node_Id := Expression (N);
1822 Id : constant Entity_Id := Defining_Identifier (N);
1823 Etyp : constant Entity_Id := Etype (Id);
1824 Dims_Of_Etyp : constant Dimension_Type := Dimensions_Of (Etyp);
1825 Dims_Of_Expr : Dimension_Type;
1827 procedure Error_Dim_Msg_For_Component_Declaration
1828 (N : Node_Id;
1829 Etyp : Entity_Id;
1830 Expr : Node_Id);
1831 -- Error using Error_Msg_N at node N. Output the dimensions of the
1832 -- type Etyp and the expression Expr of N.
1834 ---------------------------------------------
1835 -- Error_Dim_Msg_For_Component_Declaration --
1836 ---------------------------------------------
1838 procedure Error_Dim_Msg_For_Component_Declaration
1839 (N : Node_Id;
1840 Etyp : Entity_Id;
1841 Expr : Node_Id) is
1842 begin
1843 Error_Msg_N ("dimensions mismatch in component declaration", N);
1844 Error_Msg_N
1845 ("\expected dimension " & Dimensions_Msg_Of (Etyp) & ", found "
1846 & Dimensions_Msg_Of (Expr), Expr);
1847 end Error_Dim_Msg_For_Component_Declaration;
1849 -- Start of processing for Analyze_Dimension_Component_Declaration
1851 begin
1852 -- Expression is present
1854 if Present (Expr) then
1855 Dims_Of_Expr := Dimensions_Of (Expr);
1857 -- Check dimensions match
1859 if Dims_Of_Etyp /= Dims_Of_Expr then
1861 -- Numeric literal case. Issue a warning if the object type is not
1862 -- dimensionless to indicate the literal is treated as if its
1863 -- dimension matches the type dimension.
1865 if Nkind_In (Original_Node (Expr), N_Real_Literal,
1866 N_Integer_Literal)
1867 then
1868 Dim_Warning_For_Numeric_Literal (Expr, Etyp);
1870 -- Issue a dimension mismatch error for all other cases
1872 else
1873 Error_Dim_Msg_For_Component_Declaration (N, Etyp, Expr);
1874 end if;
1875 end if;
1876 end if;
1877 end Analyze_Dimension_Component_Declaration;
1879 -------------------------------------------------
1880 -- Analyze_Dimension_Extended_Return_Statement --
1881 -------------------------------------------------
1883 procedure Analyze_Dimension_Extended_Return_Statement (N : Node_Id) is
1884 Return_Ent : constant Entity_Id := Return_Statement_Entity (N);
1885 Return_Etyp : constant Entity_Id :=
1886 Etype (Return_Applies_To (Return_Ent));
1887 Return_Obj_Decls : constant List_Id := Return_Object_Declarations (N);
1888 Return_Obj_Decl : Node_Id;
1889 Return_Obj_Id : Entity_Id;
1890 Return_Obj_Typ : Entity_Id;
1892 procedure Error_Dim_Msg_For_Extended_Return_Statement
1893 (N : Node_Id;
1894 Return_Etyp : Entity_Id;
1895 Return_Obj_Typ : Entity_Id);
1896 -- Error using Error_Msg_N at node N. Output dimensions of the returned
1897 -- type Return_Etyp and the returned object type Return_Obj_Typ of N.
1899 -------------------------------------------------
1900 -- Error_Dim_Msg_For_Extended_Return_Statement --
1901 -------------------------------------------------
1903 procedure Error_Dim_Msg_For_Extended_Return_Statement
1904 (N : Node_Id;
1905 Return_Etyp : Entity_Id;
1906 Return_Obj_Typ : Entity_Id)
1908 begin
1909 Error_Msg_N ("dimensions mismatch in extended return statement", N);
1910 Error_Msg_N
1911 ("\expected dimension " & Dimensions_Msg_Of (Return_Etyp)
1912 & ", found " & Dimensions_Msg_Of (Return_Obj_Typ), N);
1913 end Error_Dim_Msg_For_Extended_Return_Statement;
1915 -- Start of processing for Analyze_Dimension_Extended_Return_Statement
1917 begin
1918 if Present (Return_Obj_Decls) then
1919 Return_Obj_Decl := First (Return_Obj_Decls);
1920 while Present (Return_Obj_Decl) loop
1921 if Nkind (Return_Obj_Decl) = N_Object_Declaration then
1922 Return_Obj_Id := Defining_Identifier (Return_Obj_Decl);
1924 if Is_Return_Object (Return_Obj_Id) then
1925 Return_Obj_Typ := Etype (Return_Obj_Id);
1927 -- Issue an error message if dimensions mismatch
1929 if Dimensions_Of (Return_Etyp) /=
1930 Dimensions_Of (Return_Obj_Typ)
1931 then
1932 Error_Dim_Msg_For_Extended_Return_Statement
1933 (N, Return_Etyp, Return_Obj_Typ);
1934 return;
1935 end if;
1936 end if;
1937 end if;
1939 Next (Return_Obj_Decl);
1940 end loop;
1941 end if;
1942 end Analyze_Dimension_Extended_Return_Statement;
1944 -----------------------------------------------------
1945 -- Analyze_Dimension_Extension_Or_Record_Aggregate --
1946 -----------------------------------------------------
1948 procedure Analyze_Dimension_Extension_Or_Record_Aggregate (N : Node_Id) is
1949 Comp : Node_Id;
1950 Comp_Id : Entity_Id;
1951 Comp_Typ : Entity_Id;
1952 Expr : Node_Id;
1954 Error_Detected : Boolean := False;
1955 -- This flag is used in order to indicate if an error has been detected
1956 -- so far by the compiler in this routine.
1958 begin
1959 -- Aspect is an Ada 2012 feature. Note that there is no need to check
1960 -- dimensions for aggregates that don't come from source, or if we are
1961 -- within an initialization procedure, whose expressions have been
1962 -- checked at the point of record declaration.
1964 if Ada_Version < Ada_2012
1965 or else not Comes_From_Source (N)
1966 or else Inside_Init_Proc
1967 then
1968 return;
1969 end if;
1971 Comp := First (Component_Associations (N));
1972 while Present (Comp) loop
1973 Comp_Id := Entity (First (Choices (Comp)));
1974 Comp_Typ := Etype (Comp_Id);
1976 -- Check the component type is either a dimensioned type or a
1977 -- dimensioned subtype.
1979 if Has_Dimension_System (Base_Type (Comp_Typ)) then
1980 Expr := Expression (Comp);
1982 -- A box-initialized component needs no checking.
1984 if No (Expr) and then Box_Present (Comp) then
1985 null;
1987 -- Issue an error if the dimensions of the component type and the
1988 -- dimensions of the component mismatch.
1990 elsif Dimensions_Of (Expr) /= Dimensions_Of (Comp_Typ) then
1992 -- Check if an error has already been encountered so far
1994 if not Error_Detected then
1996 -- Extension aggregate case
1998 if Nkind (N) = N_Extension_Aggregate then
1999 Error_Msg_N
2000 ("dimensions mismatch in extension aggregate", N);
2002 -- Record aggregate case
2004 else
2005 Error_Msg_N
2006 ("dimensions mismatch in record aggregate", N);
2007 end if;
2009 Error_Detected := True;
2010 end if;
2012 Error_Msg_N
2013 ("\expected dimension " & Dimensions_Msg_Of (Comp_Typ)
2014 & ", found " & Dimensions_Msg_Of (Expr), Comp);
2015 end if;
2016 end if;
2018 Next (Comp);
2019 end loop;
2020 end Analyze_Dimension_Extension_Or_Record_Aggregate;
2022 -------------------------------
2023 -- Analyze_Dimension_Formals --
2024 -------------------------------
2026 procedure Analyze_Dimension_Formals (N : Node_Id; Formals : List_Id) is
2027 Dims_Of_Typ : Dimension_Type;
2028 Formal : Node_Id;
2029 Typ : Entity_Id;
2031 begin
2032 -- Aspect is an Ada 2012 feature. Note that there is no need to check
2033 -- dimensions for sub specs that don't come from source.
2035 if Ada_Version < Ada_2012 or else not Comes_From_Source (N) then
2036 return;
2037 end if;
2039 Formal := First (Formals);
2040 while Present (Formal) loop
2041 Typ := Parameter_Type (Formal);
2042 Dims_Of_Typ := Dimensions_Of (Typ);
2044 if Exists (Dims_Of_Typ) then
2045 declare
2046 Expr : constant Node_Id := Expression (Formal);
2048 begin
2049 -- Issue a warning if Expr is a numeric literal and if its
2050 -- dimensions differ with the dimensions of the formal type.
2052 if Present (Expr)
2053 and then Dims_Of_Typ /= Dimensions_Of (Expr)
2054 and then Nkind_In (Original_Node (Expr), N_Real_Literal,
2055 N_Integer_Literal)
2056 then
2057 Dim_Warning_For_Numeric_Literal (Expr, Etype (Typ));
2058 end if;
2059 end;
2060 end if;
2062 Next (Formal);
2063 end loop;
2064 end Analyze_Dimension_Formals;
2066 ---------------------------------
2067 -- Analyze_Dimension_Has_Etype --
2068 ---------------------------------
2070 procedure Analyze_Dimension_Has_Etype (N : Node_Id) is
2071 Etyp : constant Entity_Id := Etype (N);
2072 Dims_Of_Etyp : Dimension_Type := Dimensions_Of (Etyp);
2074 begin
2075 -- General case. Propagation of the dimensions from the type
2077 if Exists (Dims_Of_Etyp) then
2078 Set_Dimensions (N, Dims_Of_Etyp);
2080 -- Identifier case. Propagate the dimensions from the entity for
2081 -- identifier whose entity is a non-dimensionless constant.
2083 elsif Nkind (N) = N_Identifier then
2084 Analyze_Dimension_Identifier : declare
2085 Id : constant Entity_Id := Entity (N);
2087 begin
2088 -- If Id is missing, abnormal tree, assume previous error
2090 if No (Id) then
2091 Check_Error_Detected;
2092 return;
2094 elsif Ekind_In (Id, E_Constant, E_Named_Real)
2095 and then Exists (Dimensions_Of (Id))
2096 then
2097 Set_Dimensions (N, Dimensions_Of (Id));
2098 end if;
2099 end Analyze_Dimension_Identifier;
2101 -- Attribute reference case. Propagate the dimensions from the prefix.
2103 elsif Nkind (N) = N_Attribute_Reference
2104 and then Has_Dimension_System (Base_Type (Etyp))
2105 then
2106 Dims_Of_Etyp := Dimensions_Of (Prefix (N));
2108 -- Check the prefix is not dimensionless
2110 if Exists (Dims_Of_Etyp) then
2111 Set_Dimensions (N, Dims_Of_Etyp);
2112 end if;
2113 end if;
2115 -- Remove dimensions from inner expressions, to prevent dimensions
2116 -- table from growing uselessly.
2118 case Nkind (N) is
2119 when N_Attribute_Reference
2120 | N_Indexed_Component
2122 declare
2123 Exprs : constant List_Id := Expressions (N);
2124 Expr : Node_Id;
2126 begin
2127 if Present (Exprs) then
2128 Expr := First (Exprs);
2129 while Present (Expr) loop
2130 Remove_Dimensions (Expr);
2131 Next (Expr);
2132 end loop;
2133 end if;
2134 end;
2136 when N_Qualified_Expression
2137 | N_Type_Conversion
2138 | N_Unchecked_Type_Conversion
2140 Remove_Dimensions (Expression (N));
2142 when N_Selected_Component =>
2143 Remove_Dimensions (Selector_Name (N));
2145 when others =>
2146 null;
2147 end case;
2148 end Analyze_Dimension_Has_Etype;
2150 -------------------------------------
2151 -- Analyze_Dimension_If_Expression --
2152 -------------------------------------
2154 procedure Analyze_Dimension_If_Expression (N : Node_Id) is
2155 Then_Expr : constant Node_Id := Next (First (Expressions (N)));
2156 Else_Expr : constant Node_Id := Next (Then_Expr);
2158 begin
2159 if Dimensions_Of (Then_Expr) /= Dimensions_Of (Else_Expr) then
2160 Error_Msg_N ("dimensions mismatch in conditional expression", N);
2161 else
2162 Copy_Dimensions (Then_Expr, N);
2163 end if;
2164 end Analyze_Dimension_If_Expression;
2166 ------------------------------------------
2167 -- Analyze_Dimension_Number_Declaration --
2168 ------------------------------------------
2170 procedure Analyze_Dimension_Number_Declaration (N : Node_Id) is
2171 Expr : constant Node_Id := Expression (N);
2172 Id : constant Entity_Id := Defining_Identifier (N);
2173 Dim_Of_Expr : constant Dimension_Type := Dimensions_Of (Expr);
2175 begin
2176 if Exists (Dim_Of_Expr) then
2177 Set_Dimensions (Id, Dim_Of_Expr);
2178 Set_Etype (Id, Etype (Expr));
2179 end if;
2180 end Analyze_Dimension_Number_Declaration;
2182 ------------------------------------------
2183 -- Analyze_Dimension_Object_Declaration --
2184 ------------------------------------------
2186 procedure Analyze_Dimension_Object_Declaration (N : Node_Id) is
2187 Expr : constant Node_Id := Expression (N);
2188 Id : constant Entity_Id := Defining_Identifier (N);
2189 Etyp : constant Entity_Id := Etype (Id);
2190 Dim_Of_Etyp : constant Dimension_Type := Dimensions_Of (Etyp);
2191 Dim_Of_Expr : Dimension_Type;
2193 procedure Error_Dim_Msg_For_Object_Declaration
2194 (N : Node_Id;
2195 Etyp : Entity_Id;
2196 Expr : Node_Id);
2197 -- Error using Error_Msg_N at node N. Output the dimensions of the
2198 -- type Etyp and of the expression Expr.
2200 ------------------------------------------
2201 -- Error_Dim_Msg_For_Object_Declaration --
2202 ------------------------------------------
2204 procedure Error_Dim_Msg_For_Object_Declaration
2205 (N : Node_Id;
2206 Etyp : Entity_Id;
2207 Expr : Node_Id) is
2208 begin
2209 Error_Msg_N ("dimensions mismatch in object declaration", N);
2210 Error_Msg_N
2211 ("\expected dimension " & Dimensions_Msg_Of (Etyp) & ", found "
2212 & Dimensions_Msg_Of (Expr), Expr);
2213 end Error_Dim_Msg_For_Object_Declaration;
2215 -- Start of processing for Analyze_Dimension_Object_Declaration
2217 begin
2218 -- Expression is present
2220 if Present (Expr) then
2221 Dim_Of_Expr := Dimensions_Of (Expr);
2223 -- Check dimensions match
2225 if Dim_Of_Expr /= Dim_Of_Etyp then
2227 -- Numeric literal case. Issue a warning if the object type is
2228 -- not dimensionless to indicate the literal is treated as if
2229 -- its dimension matches the type dimension.
2231 if Nkind_In (Original_Node (Expr), N_Real_Literal,
2232 N_Integer_Literal)
2233 then
2234 Dim_Warning_For_Numeric_Literal (Expr, Etyp);
2236 -- Case of object is a constant whose type is a dimensioned type
2238 elsif Constant_Present (N) and then not Exists (Dim_Of_Etyp) then
2240 -- Propagate dimension from expression to object entity
2242 Set_Dimensions (Id, Dim_Of_Expr);
2244 -- Expression may have been constant-folded. If nominal type has
2245 -- dimensions, verify that expression has same type.
2247 elsif Exists (Dim_Of_Etyp) and then Etype (Expr) = Etyp then
2248 null;
2250 -- For all other cases, issue an error message
2252 else
2253 Error_Dim_Msg_For_Object_Declaration (N, Etyp, Expr);
2254 end if;
2255 end if;
2257 -- Remove dimensions in expression after checking consistency with
2258 -- given type.
2260 Remove_Dimensions (Expr);
2261 end if;
2262 end Analyze_Dimension_Object_Declaration;
2264 ---------------------------------------------------
2265 -- Analyze_Dimension_Object_Renaming_Declaration --
2266 ---------------------------------------------------
2268 procedure Analyze_Dimension_Object_Renaming_Declaration (N : Node_Id) is
2269 Renamed_Name : constant Node_Id := Name (N);
2270 Sub_Mark : constant Node_Id := Subtype_Mark (N);
2272 procedure Error_Dim_Msg_For_Object_Renaming_Declaration
2273 (N : Node_Id;
2274 Sub_Mark : Node_Id;
2275 Renamed_Name : Node_Id);
2276 -- Error using Error_Msg_N at node N. Output the dimensions of
2277 -- Sub_Mark and of Renamed_Name.
2279 ---------------------------------------------------
2280 -- Error_Dim_Msg_For_Object_Renaming_Declaration --
2281 ---------------------------------------------------
2283 procedure Error_Dim_Msg_For_Object_Renaming_Declaration
2284 (N : Node_Id;
2285 Sub_Mark : Node_Id;
2286 Renamed_Name : Node_Id) is
2287 begin
2288 Error_Msg_N ("dimensions mismatch in object renaming declaration", N);
2289 Error_Msg_N
2290 ("\expected dimension " & Dimensions_Msg_Of (Sub_Mark) & ", found "
2291 & Dimensions_Msg_Of (Renamed_Name), Renamed_Name);
2292 end Error_Dim_Msg_For_Object_Renaming_Declaration;
2294 -- Start of processing for Analyze_Dimension_Object_Renaming_Declaration
2296 begin
2297 if Dimensions_Of (Renamed_Name) /= Dimensions_Of (Sub_Mark) then
2298 Error_Dim_Msg_For_Object_Renaming_Declaration
2299 (N, Sub_Mark, Renamed_Name);
2300 end if;
2301 end Analyze_Dimension_Object_Renaming_Declaration;
2303 -----------------------------------------------
2304 -- Analyze_Dimension_Simple_Return_Statement --
2305 -----------------------------------------------
2307 procedure Analyze_Dimension_Simple_Return_Statement (N : Node_Id) is
2308 Expr : constant Node_Id := Expression (N);
2309 Return_Ent : constant Entity_Id := Return_Statement_Entity (N);
2310 Return_Etyp : constant Entity_Id :=
2311 Etype (Return_Applies_To (Return_Ent));
2312 Dims_Of_Return_Etyp : constant Dimension_Type :=
2313 Dimensions_Of (Return_Etyp);
2315 procedure Error_Dim_Msg_For_Simple_Return_Statement
2316 (N : Node_Id;
2317 Return_Etyp : Entity_Id;
2318 Expr : Node_Id);
2319 -- Error using Error_Msg_N at node N. Output the dimensions of the
2320 -- returned type Return_Etyp and the returned expression Expr of N.
2322 -----------------------------------------------
2323 -- Error_Dim_Msg_For_Simple_Return_Statement --
2324 -----------------------------------------------
2326 procedure Error_Dim_Msg_For_Simple_Return_Statement
2327 (N : Node_Id;
2328 Return_Etyp : Entity_Id;
2329 Expr : Node_Id)
2331 begin
2332 Error_Msg_N ("dimensions mismatch in return statement", N);
2333 Error_Msg_N
2334 ("\expected dimension " & Dimensions_Msg_Of (Return_Etyp)
2335 & ", found " & Dimensions_Msg_Of (Expr), Expr);
2336 end Error_Dim_Msg_For_Simple_Return_Statement;
2338 -- Start of processing for Analyze_Dimension_Simple_Return_Statement
2340 begin
2341 if Dims_Of_Return_Etyp /= Dimensions_Of (Expr) then
2342 Error_Dim_Msg_For_Simple_Return_Statement (N, Return_Etyp, Expr);
2343 Remove_Dimensions (Expr);
2344 end if;
2345 end Analyze_Dimension_Simple_Return_Statement;
2347 -------------------------------------------
2348 -- Analyze_Dimension_Subtype_Declaration --
2349 -------------------------------------------
2351 procedure Analyze_Dimension_Subtype_Declaration (N : Node_Id) is
2352 Id : constant Entity_Id := Defining_Identifier (N);
2353 Dims_Of_Id : constant Dimension_Type := Dimensions_Of (Id);
2354 Dims_Of_Etyp : Dimension_Type;
2355 Etyp : Node_Id;
2357 begin
2358 -- No constraint case in subtype declaration
2360 if Nkind (Subtype_Indication (N)) /= N_Subtype_Indication then
2361 Etyp := Etype (Subtype_Indication (N));
2362 Dims_Of_Etyp := Dimensions_Of (Etyp);
2364 if Exists (Dims_Of_Etyp) then
2366 -- If subtype already has a dimension (from Aspect_Dimension), it
2367 -- cannot inherit different dimensions from its subtype.
2369 if Exists (Dims_Of_Id) and then Dims_Of_Etyp /= Dims_Of_Id then
2370 Error_Msg_NE
2371 ("subtype& already " & Dimensions_Msg_Of (Id, True), N, Id);
2372 else
2373 Set_Dimensions (Id, Dims_Of_Etyp);
2374 Set_Symbol (Id, Symbol_Of (Etyp));
2375 end if;
2376 end if;
2378 -- Constraint present in subtype declaration
2380 else
2381 Etyp := Etype (Subtype_Mark (Subtype_Indication (N)));
2382 Dims_Of_Etyp := Dimensions_Of (Etyp);
2384 if Exists (Dims_Of_Etyp) then
2385 Set_Dimensions (Id, Dims_Of_Etyp);
2386 Set_Symbol (Id, Symbol_Of (Etyp));
2387 end if;
2388 end if;
2389 end Analyze_Dimension_Subtype_Declaration;
2391 ---------------------------------------
2392 -- Analyze_Dimension_Type_Conversion --
2393 ---------------------------------------
2395 procedure Analyze_Dimension_Type_Conversion (N : Node_Id) is
2396 Expr_Root : constant Entity_Id :=
2397 Dimension_System_Root (Etype (Expression (N)));
2398 Target_Root : constant Entity_Id :=
2399 Dimension_System_Root (Etype (N));
2401 begin
2402 -- If the expression has dimensions and the target type has dimensions,
2403 -- the conversion has the dimensions of the expression. Consistency is
2404 -- checked below. Converting to a non-dimensioned type such as Float
2405 -- ignores the dimensions of the expression.
2407 if Exists (Dimensions_Of (Expression (N)))
2408 and then Present (Target_Root)
2409 then
2410 Set_Dimensions (N, Dimensions_Of (Expression (N)));
2412 -- Otherwise the dimensions are those of the target type.
2414 else
2415 Analyze_Dimension_Has_Etype (N);
2416 end if;
2418 -- A conversion between types in different dimension systems (e.g. MKS
2419 -- and British units) must respect the dimensions of expression and
2420 -- type, It is up to the user to provide proper conversion factors.
2422 -- Upward conversions to root type of a dimensioned system are legal,
2423 -- and correspond to "view conversions", i.e. preserve the dimensions
2424 -- of the expression; otherwise conversion must be between types with
2425 -- then same dimensions. Conversions to a non-dimensioned type such as
2426 -- Float lose the dimensions of the expression.
2428 if Present (Expr_Root)
2429 and then Present (Target_Root)
2430 and then Etype (N) /= Target_Root
2431 and then Dimensions_Of (Expression (N)) /= Dimensions_Of (Etype (N))
2432 then
2433 Error_Msg_N ("dimensions mismatch in conversion", N);
2434 Error_Msg_N
2435 ("\expression " & Dimensions_Msg_Of (Expression (N), True), N);
2436 Error_Msg_N
2437 ("\target type " & Dimensions_Msg_Of (Etype (N), True), N);
2438 end if;
2439 end Analyze_Dimension_Type_Conversion;
2441 --------------------------------
2442 -- Analyze_Dimension_Unary_Op --
2443 --------------------------------
2445 procedure Analyze_Dimension_Unary_Op (N : Node_Id) is
2446 begin
2447 case Nkind (N) is
2449 -- Propagate the dimension if the operand is not dimensionless
2451 when N_Op_Abs
2452 | N_Op_Minus
2453 | N_Op_Plus
2455 declare
2456 R : constant Node_Id := Right_Opnd (N);
2457 begin
2458 Move_Dimensions (R, N);
2459 end;
2461 when others =>
2462 null;
2463 end case;
2464 end Analyze_Dimension_Unary_Op;
2466 ---------------------------------
2467 -- Check_Expression_Dimensions --
2468 ---------------------------------
2470 procedure Check_Expression_Dimensions
2471 (Expr : Node_Id;
2472 Typ : Entity_Id)
2474 begin
2475 if Is_Floating_Point_Type (Etype (Expr)) then
2476 Analyze_Dimension (Expr);
2478 if Dimensions_Of (Expr) /= Dimensions_Of (Typ) then
2479 Error_Msg_N ("dimensions mismatch in array aggregate", Expr);
2480 Error_Msg_N
2481 ("\expected dimension " & Dimensions_Msg_Of (Typ)
2482 & ", found " & Dimensions_Msg_Of (Expr), Expr);
2483 end if;
2484 end if;
2485 end Check_Expression_Dimensions;
2487 ---------------------
2488 -- Copy_Dimensions --
2489 ---------------------
2491 procedure Copy_Dimensions (From : Node_Id; To : Node_Id) is
2492 Dims_Of_From : constant Dimension_Type := Dimensions_Of (From);
2494 begin
2495 -- Ignore if not Ada 2012 or beyond
2497 if Ada_Version < Ada_2012 then
2498 return;
2500 -- For Ada 2012, Copy the dimension of 'From to 'To'
2502 elsif Exists (Dims_Of_From) then
2503 Set_Dimensions (To, Dims_Of_From);
2504 end if;
2505 end Copy_Dimensions;
2507 -----------------------------------
2508 -- Copy_Dimensions_Of_Components --
2509 -----------------------------------
2511 procedure Copy_Dimensions_Of_Components (Rec : Entity_Id) is
2512 C : Entity_Id;
2514 begin
2515 C := First_Component (Rec);
2516 while Present (C) loop
2517 if Nkind (Parent (C)) = N_Component_Declaration then
2518 Copy_Dimensions
2519 (Expression (Parent (Corresponding_Record_Component (C))),
2520 Expression (Parent (C)));
2521 end if;
2522 Next_Component (C);
2523 end loop;
2524 end Copy_Dimensions_Of_Components;
2526 --------------------------
2527 -- Create_Rational_From --
2528 --------------------------
2530 -- RATIONAL ::= [-] NUMERAL [/ NUMERAL]
2532 -- A rational number is a number that can be expressed as the quotient or
2533 -- fraction a/b of two integers, where b is non-zero positive.
2535 function Create_Rational_From
2536 (Expr : Node_Id;
2537 Complain : Boolean) return Rational
2539 Or_Node_Of_Expr : constant Node_Id := Original_Node (Expr);
2540 Result : Rational := No_Rational;
2542 function Process_Minus (N : Node_Id) return Rational;
2543 -- Create a rational from a N_Op_Minus node
2545 function Process_Divide (N : Node_Id) return Rational;
2546 -- Create a rational from a N_Op_Divide node
2548 function Process_Literal (N : Node_Id) return Rational;
2549 -- Create a rational from a N_Integer_Literal node
2551 -------------------
2552 -- Process_Minus --
2553 -------------------
2555 function Process_Minus (N : Node_Id) return Rational is
2556 Right : constant Node_Id := Original_Node (Right_Opnd (N));
2557 Result : Rational;
2559 begin
2560 -- Operand is an integer literal
2562 if Nkind (Right) = N_Integer_Literal then
2563 Result := -Process_Literal (Right);
2565 -- Operand is a divide operator
2567 elsif Nkind (Right) = N_Op_Divide then
2568 Result := -Process_Divide (Right);
2570 else
2571 Result := No_Rational;
2572 end if;
2574 -- Provide minimal semantic information on dimension expressions,
2575 -- even though they have no run-time existence. This is for use by
2576 -- ASIS tools, in particular pretty-printing. If generating code
2577 -- standard operator resolution will take place.
2579 if ASIS_Mode then
2580 Set_Entity (N, Standard_Op_Minus);
2581 Set_Etype (N, Standard_Integer);
2582 end if;
2584 return Result;
2585 end Process_Minus;
2587 --------------------
2588 -- Process_Divide --
2589 --------------------
2591 function Process_Divide (N : Node_Id) return Rational is
2592 Left : constant Node_Id := Original_Node (Left_Opnd (N));
2593 Right : constant Node_Id := Original_Node (Right_Opnd (N));
2594 Left_Rat : Rational;
2595 Result : Rational := No_Rational;
2596 Right_Rat : Rational;
2598 begin
2599 -- Both left and right operands are integer literals
2601 if Nkind (Left) = N_Integer_Literal
2602 and then
2603 Nkind (Right) = N_Integer_Literal
2604 then
2605 Left_Rat := Process_Literal (Left);
2606 Right_Rat := Process_Literal (Right);
2607 Result := Left_Rat / Right_Rat;
2608 end if;
2610 -- Provide minimal semantic information on dimension expressions,
2611 -- even though they have no run-time existence. This is for use by
2612 -- ASIS tools, in particular pretty-printing. If generating code
2613 -- standard operator resolution will take place.
2615 if ASIS_Mode then
2616 Set_Entity (N, Standard_Op_Divide);
2617 Set_Etype (N, Standard_Integer);
2618 end if;
2620 return Result;
2621 end Process_Divide;
2623 ---------------------
2624 -- Process_Literal --
2625 ---------------------
2627 function Process_Literal (N : Node_Id) return Rational is
2628 begin
2629 return +Whole (UI_To_Int (Intval (N)));
2630 end Process_Literal;
2632 -- Start of processing for Create_Rational_From
2634 begin
2635 -- Check the expression is either a division of two integers or an
2636 -- integer itself. Note that the check applies to the original node
2637 -- since the node could have already been rewritten.
2639 -- Integer literal case
2641 if Nkind (Or_Node_Of_Expr) = N_Integer_Literal then
2642 Result := Process_Literal (Or_Node_Of_Expr);
2644 -- Divide operator case
2646 elsif Nkind (Or_Node_Of_Expr) = N_Op_Divide then
2647 Result := Process_Divide (Or_Node_Of_Expr);
2649 -- Minus operator case
2651 elsif Nkind (Or_Node_Of_Expr) = N_Op_Minus then
2652 Result := Process_Minus (Or_Node_Of_Expr);
2653 end if;
2655 -- When Expr cannot be interpreted as a rational and Complain is true,
2656 -- generate an error message.
2658 if Complain and then Result = No_Rational then
2659 Error_Msg_N ("rational expected", Expr);
2660 end if;
2662 return Result;
2663 end Create_Rational_From;
2665 -------------------
2666 -- Dimensions_Of --
2667 -------------------
2669 function Dimensions_Of (N : Node_Id) return Dimension_Type is
2670 begin
2671 return Dimension_Table.Get (N);
2672 end Dimensions_Of;
2674 -----------------------
2675 -- Dimensions_Msg_Of --
2676 -----------------------
2678 function Dimensions_Msg_Of
2679 (N : Node_Id;
2680 Description_Needed : Boolean := False) return String
2682 Dims_Of_N : constant Dimension_Type := Dimensions_Of (N);
2683 Dimensions_Msg : Name_Id;
2684 System : System_Type;
2686 begin
2687 -- Initialization of Name_Buffer
2689 Name_Len := 0;
2691 -- N is not dimensionless
2693 if Exists (Dims_Of_N) then
2694 System := System_Of (Base_Type (Etype (N)));
2696 -- When Description_Needed, add to string "has dimension " before the
2697 -- actual dimension.
2699 if Description_Needed then
2700 Add_Str_To_Name_Buffer ("has dimension ");
2701 end if;
2703 Append
2704 (Global_Name_Buffer,
2705 From_Dim_To_Str_Of_Dim_Symbols (Dims_Of_N, System, True));
2707 -- N is dimensionless
2709 -- When Description_Needed, return "is dimensionless"
2711 elsif Description_Needed then
2712 Add_Str_To_Name_Buffer ("is dimensionless");
2714 -- Otherwise, return "'[']"
2716 else
2717 Add_Str_To_Name_Buffer ("'[']");
2718 end if;
2720 Dimensions_Msg := Name_Find;
2721 return Get_Name_String (Dimensions_Msg);
2722 end Dimensions_Msg_Of;
2724 --------------------------
2725 -- Dimension_Table_Hash --
2726 --------------------------
2728 function Dimension_Table_Hash
2729 (Key : Node_Id) return Dimension_Table_Range
2731 begin
2732 return Dimension_Table_Range (Key mod 511);
2733 end Dimension_Table_Hash;
2735 -------------------------------------
2736 -- Dim_Warning_For_Numeric_Literal --
2737 -------------------------------------
2739 procedure Dim_Warning_For_Numeric_Literal (N : Node_Id; Typ : Entity_Id) is
2740 begin
2741 -- Consider the literal zero (integer 0 or real 0.0) to be of any
2742 -- dimension.
2744 case Nkind (Original_Node (N)) is
2745 when N_Real_Literal =>
2746 if Expr_Value_R (N) = Ureal_0 then
2747 return;
2748 end if;
2750 when N_Integer_Literal =>
2751 if Expr_Value (N) = Uint_0 then
2752 return;
2753 end if;
2755 when others =>
2756 null;
2757 end case;
2759 -- Initialize name buffer
2761 Name_Len := 0;
2763 Append (Global_Name_Buffer, String_From_Numeric_Literal (N));
2765 -- Insert a blank between the literal and the symbol
2767 Add_Str_To_Name_Buffer (" ");
2768 Append (Global_Name_Buffer, Symbol_Of (Typ));
2770 Error_Msg_Name_1 := Name_Find;
2771 Error_Msg_N ("assumed to be%%??", N);
2772 end Dim_Warning_For_Numeric_Literal;
2774 ----------------------
2775 -- Dimensions_Match --
2776 ----------------------
2778 function Dimensions_Match (T1 : Entity_Id; T2 : Entity_Id) return Boolean is
2779 begin
2780 return
2781 not Has_Dimension_System (Base_Type (T1))
2782 or else Dimensions_Of (T1) = Dimensions_Of (T2);
2783 end Dimensions_Match;
2785 ---------------------------
2786 -- Dimension_System_Root --
2787 ---------------------------
2789 function Dimension_System_Root (T : Entity_Id) return Entity_Id is
2790 Root : Entity_Id;
2792 begin
2793 Root := Base_Type (T);
2795 if Has_Dimension_System (Root) then
2796 return First_Subtype (Root); -- for example Dim_Mks
2798 else
2799 return Empty;
2800 end if;
2801 end Dimension_System_Root;
2803 ----------------------------------------
2804 -- Eval_Op_Expon_For_Dimensioned_Type --
2805 ----------------------------------------
2807 -- Evaluate the expon operator for real dimensioned type.
2809 -- Note that if the exponent is an integer (denominator = 1) the node is
2810 -- evaluated by the regular Eval_Op_Expon routine (see Sem_Eval).
2812 procedure Eval_Op_Expon_For_Dimensioned_Type
2813 (N : Node_Id;
2814 Btyp : Entity_Id)
2816 R : constant Node_Id := Right_Opnd (N);
2817 R_Value : Rational := No_Rational;
2819 begin
2820 if Is_Real_Type (Btyp) then
2821 R_Value := Create_Rational_From (R, False);
2822 end if;
2824 -- Check that the exponent is not an integer
2826 if R_Value /= No_Rational and then R_Value.Denominator /= 1 then
2827 Eval_Op_Expon_With_Rational_Exponent (N, R_Value);
2828 else
2829 Eval_Op_Expon (N);
2830 end if;
2831 end Eval_Op_Expon_For_Dimensioned_Type;
2833 ------------------------------------------
2834 -- Eval_Op_Expon_With_Rational_Exponent --
2835 ------------------------------------------
2837 -- For dimensioned operand in exponentiation, exponent is allowed to be a
2838 -- Rational and not only an Integer like for dimensionless operands. For
2839 -- that particular case, the left operand is rewritten as a function call
2840 -- using the function Expon_LLF from s-llflex.ads.
2842 procedure Eval_Op_Expon_With_Rational_Exponent
2843 (N : Node_Id;
2844 Exponent_Value : Rational)
2846 Loc : constant Source_Ptr := Sloc (N);
2847 Dims_Of_N : constant Dimension_Type := Dimensions_Of (N);
2848 L : constant Node_Id := Left_Opnd (N);
2849 Etyp_Of_L : constant Entity_Id := Etype (L);
2850 Btyp_Of_L : constant Entity_Id := Base_Type (Etyp_Of_L);
2851 Actual_1 : Node_Id;
2852 Actual_2 : Node_Id;
2853 Dim_Power : Rational;
2854 List_Of_Dims : List_Id;
2855 New_Aspect : Node_Id;
2856 New_Aspects : List_Id;
2857 New_Id : Entity_Id;
2858 New_N : Node_Id;
2859 New_Subtyp_Decl_For_L : Node_Id;
2860 System : System_Type;
2862 begin
2863 -- Case when the operand is not dimensionless
2865 if Exists (Dims_Of_N) then
2867 -- Get the corresponding System_Type to know the exact number of
2868 -- dimensions in the system.
2870 System := System_Of (Btyp_Of_L);
2872 -- Generation of a new subtype with the proper dimensions
2874 -- In order to rewrite the operator as a type conversion, a new
2875 -- dimensioned subtype with the resulting dimensions of the
2876 -- exponentiation must be created.
2878 -- Generate:
2880 -- Btyp_Of_L : constant Entity_Id := Base_Type (Etyp_Of_L);
2881 -- System : constant System_Id :=
2882 -- Get_Dimension_System_Id (Btyp_Of_L);
2883 -- Num_Of_Dims : constant Number_Of_Dimensions :=
2884 -- Dimension_Systems.Table (System).Dimension_Count;
2886 -- subtype T is Btyp_Of_L
2887 -- with
2888 -- Dimension => (
2889 -- Dims_Of_N (1).Numerator / Dims_Of_N (1).Denominator,
2890 -- Dims_Of_N (2).Numerator / Dims_Of_N (2).Denominator,
2891 -- ...
2892 -- Dims_Of_N (Num_Of_Dims).Numerator /
2893 -- Dims_Of_N (Num_Of_Dims).Denominator);
2895 -- Step 1: Generate the new aggregate for the aspect Dimension
2897 New_Aspects := Empty_List;
2899 List_Of_Dims := New_List;
2900 for Position in Dims_Of_N'First .. System.Count loop
2901 Dim_Power := Dims_Of_N (Position);
2902 Append_To (List_Of_Dims,
2903 Make_Op_Divide (Loc,
2904 Left_Opnd =>
2905 Make_Integer_Literal (Loc, Int (Dim_Power.Numerator)),
2906 Right_Opnd =>
2907 Make_Integer_Literal (Loc, Int (Dim_Power.Denominator))));
2908 end loop;
2910 -- Step 2: Create the new Aspect Specification for Aspect Dimension
2912 New_Aspect :=
2913 Make_Aspect_Specification (Loc,
2914 Identifier => Make_Identifier (Loc, Name_Dimension),
2915 Expression => Make_Aggregate (Loc, Expressions => List_Of_Dims));
2917 -- Step 3: Make a temporary identifier for the new subtype
2919 New_Id := Make_Temporary (Loc, 'T');
2920 Set_Is_Internal (New_Id);
2922 -- Step 4: Declaration of the new subtype
2924 New_Subtyp_Decl_For_L :=
2925 Make_Subtype_Declaration (Loc,
2926 Defining_Identifier => New_Id,
2927 Subtype_Indication => New_Occurrence_Of (Btyp_Of_L, Loc));
2929 Append (New_Aspect, New_Aspects);
2930 Set_Parent (New_Aspects, New_Subtyp_Decl_For_L);
2931 Set_Aspect_Specifications (New_Subtyp_Decl_For_L, New_Aspects);
2933 Analyze (New_Subtyp_Decl_For_L);
2935 -- Case where the operand is dimensionless
2937 else
2938 New_Id := Btyp_Of_L;
2939 end if;
2941 -- Replacement of N by New_N
2943 -- Generate:
2945 -- Actual_1 := Long_Long_Float (L),
2947 -- Actual_2 := Long_Long_Float (Exponent_Value.Numerator) /
2948 -- Long_Long_Float (Exponent_Value.Denominator);
2950 -- (T (Expon_LLF (Actual_1, Actual_2)));
2952 -- where T is the subtype declared in step 1
2954 -- The node is rewritten as a type conversion
2956 -- Step 1: Creation of the two parameters of Expon_LLF function call
2958 Actual_1 :=
2959 Make_Type_Conversion (Loc,
2960 Subtype_Mark => New_Occurrence_Of (Standard_Long_Long_Float, Loc),
2961 Expression => Relocate_Node (L));
2963 Actual_2 :=
2964 Make_Op_Divide (Loc,
2965 Left_Opnd =>
2966 Make_Real_Literal (Loc,
2967 UR_From_Uint (UI_From_Int (Int (Exponent_Value.Numerator)))),
2968 Right_Opnd =>
2969 Make_Real_Literal (Loc,
2970 UR_From_Uint (UI_From_Int (Int (Exponent_Value.Denominator)))));
2972 -- Step 2: Creation of New_N
2974 New_N :=
2975 Make_Type_Conversion (Loc,
2976 Subtype_Mark => New_Occurrence_Of (New_Id, Loc),
2977 Expression =>
2978 Make_Function_Call (Loc,
2979 Name => New_Occurrence_Of (RTE (RE_Expon_LLF), Loc),
2980 Parameter_Associations => New_List (
2981 Actual_1, Actual_2)));
2983 -- Step 3: Rewrite N with the result
2985 Rewrite (N, New_N);
2986 Set_Etype (N, New_Id);
2987 Analyze_And_Resolve (N, New_Id);
2988 end Eval_Op_Expon_With_Rational_Exponent;
2990 ------------
2991 -- Exists --
2992 ------------
2994 function Exists (Dim : Dimension_Type) return Boolean is
2995 begin
2996 return Dim /= Null_Dimension;
2997 end Exists;
2999 function Exists (Str : String_Id) return Boolean is
3000 begin
3001 return Str /= No_String;
3002 end Exists;
3004 function Exists (Sys : System_Type) return Boolean is
3005 begin
3006 return Sys /= Null_System;
3007 end Exists;
3009 ---------------------------------
3010 -- Expand_Put_Call_With_Symbol --
3011 ---------------------------------
3013 -- For procedure Put (resp. Put_Dim_Of) and function Image, defined in
3014 -- System.Dim.Float_IO or System.Dim.Integer_IO, the default string
3015 -- parameter is rewritten to include the unit symbol (or the dimension
3016 -- symbols if not a defined quantity) in the output of a dimensioned
3017 -- object. If a value is already supplied by the user for the parameter
3018 -- Symbol, it is used as is.
3020 -- Case 1. Item is dimensionless
3022 -- * Put : Item appears without a suffix
3024 -- * Put_Dim_Of : the output is []
3026 -- Obj : Mks_Type := 2.6;
3027 -- Put (Obj, 1, 1, 0);
3028 -- Put_Dim_Of (Obj);
3030 -- The corresponding outputs are:
3031 -- $2.6
3032 -- $[]
3034 -- Case 2. Item has a dimension
3036 -- * Put : If the type of Item is a dimensioned subtype whose
3037 -- symbol is not empty, then the symbol appears as a
3038 -- suffix. Otherwise, a new string is created and appears
3039 -- as a suffix of Item. This string results in the
3040 -- successive concatanations between each unit symbol
3041 -- raised by its corresponding dimension power from the
3042 -- dimensions of Item.
3044 -- * Put_Dim_Of : The output is a new string resulting in the successive
3045 -- concatanations between each dimension symbol raised by
3046 -- its corresponding dimension power from the dimensions of
3047 -- Item.
3049 -- subtype Random is Mks_Type
3050 -- with
3051 -- Dimension => (
3052 -- Meter => 3,
3053 -- Candela => -1,
3054 -- others => 0);
3056 -- Obj : Random := 5.0;
3057 -- Put (Obj);
3058 -- Put_Dim_Of (Obj);
3060 -- The corresponding outputs are:
3061 -- $5.0 m**3.cd**(-1)
3062 -- $[l**3.J**(-1)]
3064 -- The function Image returns the string identical to that produced by
3065 -- a call to Put whose first parameter is a string.
3067 procedure Expand_Put_Call_With_Symbol (N : Node_Id) is
3068 Actuals : constant List_Id := Parameter_Associations (N);
3069 Loc : constant Source_Ptr := Sloc (N);
3070 Name_Call : constant Node_Id := Name (N);
3071 New_Actuals : constant List_Id := New_List;
3072 Actual : Node_Id;
3073 Dims_Of_Actual : Dimension_Type;
3074 Etyp : Entity_Id;
3075 New_Str_Lit : Node_Id := Empty;
3076 Symbols : String_Id;
3078 Is_Put_Dim_Of : Boolean := False;
3079 -- This flag is used in order to differentiate routines Put and
3080 -- Put_Dim_Of. Set to True if the procedure is one of the Put_Dim_Of
3081 -- defined in System.Dim.Float_IO or System.Dim.Integer_IO.
3083 function Has_Symbols return Boolean;
3084 -- Return True if the current Put call already has a parameter
3085 -- association for parameter "Symbols" with the correct string of
3086 -- symbols.
3088 function Is_Procedure_Put_Call return Boolean;
3089 -- Return True if the current call is a call of an instantiation of a
3090 -- procedure Put defined in the package System.Dim.Float_IO and
3091 -- System.Dim.Integer_IO.
3093 function Item_Actual return Node_Id;
3094 -- Return the item actual parameter node in the output call
3096 -----------------
3097 -- Has_Symbols --
3098 -----------------
3100 function Has_Symbols return Boolean is
3101 Actual : Node_Id;
3102 Actual_Str : Node_Id;
3104 begin
3105 -- Look for a symbols parameter association in the list of actuals
3107 Actual := First (Actuals);
3108 while Present (Actual) loop
3110 -- Positional parameter association case when the actual is a
3111 -- string literal.
3113 if Nkind (Actual) = N_String_Literal then
3114 Actual_Str := Actual;
3116 -- Named parameter association case when selector name is Symbol
3118 elsif Nkind (Actual) = N_Parameter_Association
3119 and then Chars (Selector_Name (Actual)) = Name_Symbol
3120 then
3121 Actual_Str := Explicit_Actual_Parameter (Actual);
3123 -- Ignore all other cases
3125 else
3126 Actual_Str := Empty;
3127 end if;
3129 if Present (Actual_Str) then
3131 -- Return True if the actual comes from source or if the string
3132 -- of symbols doesn't have the default value (i.e. it is ""),
3133 -- in which case it is used as suffix of the generated string.
3135 if Comes_From_Source (Actual)
3136 or else String_Length (Strval (Actual_Str)) /= 0
3137 then
3138 return True;
3140 else
3141 return False;
3142 end if;
3143 end if;
3145 Next (Actual);
3146 end loop;
3148 -- At this point, the call has no parameter association. Look to the
3149 -- last actual since the symbols parameter is the last one.
3151 return Nkind (Last (Actuals)) = N_String_Literal;
3152 end Has_Symbols;
3154 ---------------------------
3155 -- Is_Procedure_Put_Call --
3156 ---------------------------
3158 function Is_Procedure_Put_Call return Boolean is
3159 Ent : Entity_Id;
3160 Loc : Source_Ptr;
3162 begin
3163 -- There are three different Put (resp. Put_Dim_Of) routines in each
3164 -- generic dim IO package. Verify the current procedure call is one
3165 -- of them.
3167 if Is_Entity_Name (Name_Call) then
3168 Ent := Entity (Name_Call);
3170 -- Get the original subprogram entity following the renaming chain
3172 if Present (Alias (Ent)) then
3173 Ent := Alias (Ent);
3174 end if;
3176 Loc := Sloc (Ent);
3178 -- Check the name of the entity subprogram is Put (resp.
3179 -- Put_Dim_Of) and verify this entity is located in either
3180 -- System.Dim.Float_IO or System.Dim.Integer_IO.
3182 if Loc > No_Location
3183 and then Is_Dim_IO_Package_Entity
3184 (Cunit_Entity (Get_Source_Unit (Loc)))
3185 then
3186 if Chars (Ent) = Name_Put_Dim_Of then
3187 Is_Put_Dim_Of := True;
3188 return True;
3190 elsif Chars (Ent) = Name_Put
3191 or else Chars (Ent) = Name_Image
3192 then
3193 return True;
3194 end if;
3195 end if;
3196 end if;
3198 return False;
3199 end Is_Procedure_Put_Call;
3201 -----------------
3202 -- Item_Actual --
3203 -----------------
3205 function Item_Actual return Node_Id is
3206 Actual : Node_Id;
3208 begin
3209 -- Look for the item actual as a parameter association
3211 Actual := First (Actuals);
3212 while Present (Actual) loop
3213 if Nkind (Actual) = N_Parameter_Association
3214 and then Chars (Selector_Name (Actual)) = Name_Item
3215 then
3216 return Explicit_Actual_Parameter (Actual);
3217 end if;
3219 Next (Actual);
3220 end loop;
3222 -- Case where the item has been defined without an association
3224 Actual := First (Actuals);
3226 -- Depending on the procedure Put, Item actual could be first or
3227 -- second in the list of actuals.
3229 if Has_Dimension_System (Base_Type (Etype (Actual))) then
3230 return Actual;
3231 else
3232 return Next (Actual);
3233 end if;
3234 end Item_Actual;
3236 -- Start of processing for Expand_Put_Call_With_Symbol
3238 begin
3239 if Is_Procedure_Put_Call and then not Has_Symbols then
3240 Actual := Item_Actual;
3241 Dims_Of_Actual := Dimensions_Of (Actual);
3242 Etyp := Etype (Actual);
3244 -- Put_Dim_Of case
3246 if Is_Put_Dim_Of then
3248 -- Check that the item is not dimensionless
3250 -- Create the new String_Literal with the new String_Id generated
3251 -- by the routine From_Dim_To_Str_Of_Dim_Symbols.
3253 if Exists (Dims_Of_Actual) then
3254 New_Str_Lit :=
3255 Make_String_Literal (Loc,
3256 From_Dim_To_Str_Of_Dim_Symbols
3257 (Dims_Of_Actual, System_Of (Base_Type (Etyp))));
3259 -- If dimensionless, the output is []
3261 else
3262 New_Str_Lit :=
3263 Make_String_Literal (Loc, "[]");
3264 end if;
3266 -- Put case
3268 else
3269 -- Add the symbol as a suffix of the value if the subtype has a
3270 -- unit symbol or if the parameter is not dimensionless.
3272 if Exists (Symbol_Of (Etyp)) then
3273 Symbols := Symbol_Of (Etyp);
3274 else
3275 Symbols := From_Dim_To_Str_Of_Unit_Symbols
3276 (Dims_Of_Actual, System_Of (Base_Type (Etyp)));
3277 end if;
3279 -- Check Symbols exists
3281 if Exists (Symbols) then
3282 Start_String;
3284 -- Put a space between the value and the dimension
3286 Store_String_Char (' ');
3287 Store_String_Chars (Symbols);
3288 New_Str_Lit := Make_String_Literal (Loc, End_String);
3289 end if;
3290 end if;
3292 if Present (New_Str_Lit) then
3294 -- Insert all actuals in New_Actuals
3296 Actual := First (Actuals);
3297 while Present (Actual) loop
3299 -- Copy every actuals in New_Actuals except the Symbols
3300 -- parameter association.
3302 if Nkind (Actual) = N_Parameter_Association
3303 and then Chars (Selector_Name (Actual)) /= Name_Symbol
3304 then
3305 Append_To (New_Actuals,
3306 Make_Parameter_Association (Loc,
3307 Selector_Name => New_Copy (Selector_Name (Actual)),
3308 Explicit_Actual_Parameter =>
3309 New_Copy (Explicit_Actual_Parameter (Actual))));
3311 elsif Nkind (Actual) /= N_Parameter_Association then
3312 Append_To (New_Actuals, New_Copy (Actual));
3313 end if;
3315 Next (Actual);
3316 end loop;
3318 -- Create new Symbols param association and append to New_Actuals
3320 Append_To (New_Actuals,
3321 Make_Parameter_Association (Loc,
3322 Selector_Name => Make_Identifier (Loc, Name_Symbol),
3323 Explicit_Actual_Parameter => New_Str_Lit));
3325 -- Rewrite and analyze the procedure call
3327 if Chars (Name_Call) = Name_Image then
3328 Rewrite (N,
3329 Make_Function_Call (Loc,
3330 Name => New_Copy (Name_Call),
3331 Parameter_Associations => New_Actuals));
3332 Analyze_And_Resolve (N);
3333 else
3334 Rewrite (N,
3335 Make_Procedure_Call_Statement (Loc,
3336 Name => New_Copy (Name_Call),
3337 Parameter_Associations => New_Actuals));
3338 Analyze (N);
3339 end if;
3341 end if;
3342 end if;
3343 end Expand_Put_Call_With_Symbol;
3345 ------------------------------------
3346 -- From_Dim_To_Str_Of_Dim_Symbols --
3347 ------------------------------------
3349 -- Given a dimension vector and the corresponding dimension system, create
3350 -- a String_Id to output dimension symbols corresponding to the dimensions
3351 -- Dims. If In_Error_Msg is True, there is a special handling for character
3352 -- asterisk * which is an insertion character in error messages.
3354 function From_Dim_To_Str_Of_Dim_Symbols
3355 (Dims : Dimension_Type;
3356 System : System_Type;
3357 In_Error_Msg : Boolean := False) return String_Id
3359 Dim_Power : Rational;
3360 First_Dim : Boolean := True;
3362 procedure Store_String_Oexpon;
3363 -- Store the expon operator symbol "**" in the string. In error
3364 -- messages, asterisk * is a special character and must be quoted
3365 -- to be placed literally into the message.
3367 -------------------------
3368 -- Store_String_Oexpon --
3369 -------------------------
3371 procedure Store_String_Oexpon is
3372 begin
3373 if In_Error_Msg then
3374 Store_String_Chars ("'*'*");
3375 else
3376 Store_String_Chars ("**");
3377 end if;
3378 end Store_String_Oexpon;
3380 -- Start of processing for From_Dim_To_Str_Of_Dim_Symbols
3382 begin
3383 -- Initialization of the new String_Id
3385 Start_String;
3387 -- Store the dimension symbols inside boxes
3389 if In_Error_Msg then
3390 Store_String_Chars ("'[");
3391 else
3392 Store_String_Char ('[');
3393 end if;
3395 for Position in Dimension_Type'Range loop
3396 Dim_Power := Dims (Position);
3397 if Dim_Power /= Zero then
3399 if First_Dim then
3400 First_Dim := False;
3401 else
3402 Store_String_Char ('.');
3403 end if;
3405 Store_String_Chars (System.Dim_Symbols (Position));
3407 -- Positive dimension case
3409 if Dim_Power.Numerator > 0 then
3411 -- Integer case
3413 if Dim_Power.Denominator = 1 then
3414 if Dim_Power.Numerator /= 1 then
3415 Store_String_Oexpon;
3416 Store_String_Int (Int (Dim_Power.Numerator));
3417 end if;
3419 -- Rational case when denominator /= 1
3421 else
3422 Store_String_Oexpon;
3423 Store_String_Char ('(');
3424 Store_String_Int (Int (Dim_Power.Numerator));
3425 Store_String_Char ('/');
3426 Store_String_Int (Int (Dim_Power.Denominator));
3427 Store_String_Char (')');
3428 end if;
3430 -- Negative dimension case
3432 else
3433 Store_String_Oexpon;
3434 Store_String_Char ('(');
3435 Store_String_Char ('-');
3436 Store_String_Int (Int (-Dim_Power.Numerator));
3438 -- Integer case
3440 if Dim_Power.Denominator = 1 then
3441 Store_String_Char (')');
3443 -- Rational case when denominator /= 1
3445 else
3446 Store_String_Char ('/');
3447 Store_String_Int (Int (Dim_Power.Denominator));
3448 Store_String_Char (')');
3449 end if;
3450 end if;
3451 end if;
3452 end loop;
3454 if In_Error_Msg then
3455 Store_String_Chars ("']");
3456 else
3457 Store_String_Char (']');
3458 end if;
3460 return End_String;
3461 end From_Dim_To_Str_Of_Dim_Symbols;
3463 -------------------------------------
3464 -- From_Dim_To_Str_Of_Unit_Symbols --
3465 -------------------------------------
3467 -- Given a dimension vector and the corresponding dimension system,
3468 -- create a String_Id to output the unit symbols corresponding to the
3469 -- dimensions Dims.
3471 function From_Dim_To_Str_Of_Unit_Symbols
3472 (Dims : Dimension_Type;
3473 System : System_Type) return String_Id
3475 Dim_Power : Rational;
3476 First_Dim : Boolean := True;
3478 begin
3479 -- Return No_String if dimensionless
3481 if not Exists (Dims) then
3482 return No_String;
3483 end if;
3485 -- Initialization of the new String_Id
3487 Start_String;
3489 for Position in Dimension_Type'Range loop
3490 Dim_Power := Dims (Position);
3492 if Dim_Power /= Zero then
3493 if First_Dim then
3494 First_Dim := False;
3495 else
3496 Store_String_Char ('.');
3497 end if;
3499 Store_String_Chars (System.Unit_Symbols (Position));
3501 -- Positive dimension case
3503 if Dim_Power.Numerator > 0 then
3505 -- Integer case
3507 if Dim_Power.Denominator = 1 then
3508 if Dim_Power.Numerator /= 1 then
3509 Store_String_Chars ("**");
3510 Store_String_Int (Int (Dim_Power.Numerator));
3511 end if;
3513 -- Rational case when denominator /= 1
3515 else
3516 Store_String_Chars ("**");
3517 Store_String_Char ('(');
3518 Store_String_Int (Int (Dim_Power.Numerator));
3519 Store_String_Char ('/');
3520 Store_String_Int (Int (Dim_Power.Denominator));
3521 Store_String_Char (')');
3522 end if;
3524 -- Negative dimension case
3526 else
3527 Store_String_Chars ("**");
3528 Store_String_Char ('(');
3529 Store_String_Char ('-');
3530 Store_String_Int (Int (-Dim_Power.Numerator));
3532 -- Integer case
3534 if Dim_Power.Denominator = 1 then
3535 Store_String_Char (')');
3537 -- Rational case when denominator /= 1
3539 else
3540 Store_String_Char ('/');
3541 Store_String_Int (Int (Dim_Power.Denominator));
3542 Store_String_Char (')');
3543 end if;
3544 end if;
3545 end if;
3546 end loop;
3548 return End_String;
3549 end From_Dim_To_Str_Of_Unit_Symbols;
3551 ---------
3552 -- GCD --
3553 ---------
3555 function GCD (Left, Right : Whole) return Int is
3556 L : Whole;
3557 R : Whole;
3559 begin
3560 L := Left;
3561 R := Right;
3562 while R /= 0 loop
3563 L := L mod R;
3565 if L = 0 then
3566 return Int (R);
3567 end if;
3569 R := R mod L;
3570 end loop;
3572 return Int (L);
3573 end GCD;
3575 --------------------------
3576 -- Has_Dimension_System --
3577 --------------------------
3579 function Has_Dimension_System (Typ : Entity_Id) return Boolean is
3580 begin
3581 return Exists (System_Of (Typ));
3582 end Has_Dimension_System;
3584 ------------------------------
3585 -- Is_Dim_IO_Package_Entity --
3586 ------------------------------
3588 function Is_Dim_IO_Package_Entity (E : Entity_Id) return Boolean is
3589 begin
3590 -- Check the package entity corresponds to System.Dim.Float_IO or
3591 -- System.Dim.Integer_IO.
3593 return
3594 Is_RTU (E, System_Dim_Float_IO)
3595 or else
3596 Is_RTU (E, System_Dim_Integer_IO);
3597 end Is_Dim_IO_Package_Entity;
3599 -------------------------------------
3600 -- Is_Dim_IO_Package_Instantiation --
3601 -------------------------------------
3603 function Is_Dim_IO_Package_Instantiation (N : Node_Id) return Boolean is
3604 Gen_Id : constant Node_Id := Name (N);
3606 begin
3607 -- Check that the instantiated package is either System.Dim.Float_IO
3608 -- or System.Dim.Integer_IO.
3610 return
3611 Is_Entity_Name (Gen_Id)
3612 and then Is_Dim_IO_Package_Entity (Entity (Gen_Id));
3613 end Is_Dim_IO_Package_Instantiation;
3615 ----------------
3616 -- Is_Invalid --
3617 ----------------
3619 function Is_Invalid (Position : Dimension_Position) return Boolean is
3620 begin
3621 return Position = Invalid_Position;
3622 end Is_Invalid;
3624 ---------------------
3625 -- Move_Dimensions --
3626 ---------------------
3628 procedure Move_Dimensions (From, To : Node_Id) is
3629 begin
3630 if Ada_Version < Ada_2012 then
3631 return;
3632 end if;
3634 -- Copy the dimension of 'From to 'To' and remove dimension of 'From'
3636 Copy_Dimensions (From, To);
3637 Remove_Dimensions (From);
3638 end Move_Dimensions;
3640 ---------------------------------------
3641 -- New_Copy_Tree_And_Copy_Dimensions --
3642 ---------------------------------------
3644 function New_Copy_Tree_And_Copy_Dimensions
3645 (Source : Node_Id;
3646 Map : Elist_Id := No_Elist;
3647 New_Sloc : Source_Ptr := No_Location;
3648 New_Scope : Entity_Id := Empty) return Node_Id
3650 New_Copy : constant Node_Id :=
3651 New_Copy_Tree (Source, Map, New_Sloc, New_Scope);
3653 begin
3654 -- Move the dimensions of Source to New_Copy
3656 Copy_Dimensions (Source, New_Copy);
3657 return New_Copy;
3658 end New_Copy_Tree_And_Copy_Dimensions;
3660 ------------
3661 -- Reduce --
3662 ------------
3664 function Reduce (X : Rational) return Rational is
3665 begin
3666 if X.Numerator = 0 then
3667 return Zero;
3668 end if;
3670 declare
3671 G : constant Int := GCD (X.Numerator, X.Denominator);
3672 begin
3673 return Rational'(Numerator => Whole (Int (X.Numerator) / G),
3674 Denominator => Whole (Int (X.Denominator) / G));
3675 end;
3676 end Reduce;
3678 -----------------------
3679 -- Remove_Dimensions --
3680 -----------------------
3682 procedure Remove_Dimensions (N : Node_Id) is
3683 Dims_Of_N : constant Dimension_Type := Dimensions_Of (N);
3684 begin
3685 if Exists (Dims_Of_N) then
3686 Dimension_Table.Remove (N);
3687 end if;
3688 end Remove_Dimensions;
3690 -----------------------------------
3691 -- Remove_Dimension_In_Statement --
3692 -----------------------------------
3694 -- Removal of dimension in statement as part of the Analyze_Statements
3695 -- routine (see package Sem_Ch5).
3697 procedure Remove_Dimension_In_Statement (Stmt : Node_Id) is
3698 begin
3699 if Ada_Version < Ada_2012 then
3700 return;
3701 end if;
3703 -- Remove dimension in parameter specifications for accept statement
3705 if Nkind (Stmt) = N_Accept_Statement then
3706 declare
3707 Param : Node_Id := First (Parameter_Specifications (Stmt));
3708 begin
3709 while Present (Param) loop
3710 Remove_Dimensions (Param);
3711 Next (Param);
3712 end loop;
3713 end;
3715 -- Remove dimension of name and expression in assignments
3717 elsif Nkind (Stmt) = N_Assignment_Statement then
3718 Remove_Dimensions (Expression (Stmt));
3719 Remove_Dimensions (Name (Stmt));
3720 end if;
3721 end Remove_Dimension_In_Statement;
3723 --------------------
3724 -- Set_Dimensions --
3725 --------------------
3727 procedure Set_Dimensions (N : Node_Id; Val : Dimension_Type) is
3728 begin
3729 pragma Assert (OK_For_Dimension (Nkind (N)));
3730 pragma Assert (Exists (Val));
3732 Dimension_Table.Set (N, Val);
3733 end Set_Dimensions;
3735 ----------------
3736 -- Set_Symbol --
3737 ----------------
3739 procedure Set_Symbol (E : Entity_Id; Val : String_Id) is
3740 begin
3741 Symbol_Table.Set (E, Val);
3742 end Set_Symbol;
3744 ---------------------------------
3745 -- String_From_Numeric_Literal --
3746 ---------------------------------
3748 function String_From_Numeric_Literal (N : Node_Id) return String_Id is
3749 Loc : constant Source_Ptr := Sloc (N);
3750 Sbuffer : constant Source_Buffer_Ptr :=
3751 Source_Text (Get_Source_File_Index (Loc));
3752 Src_Ptr : Source_Ptr := Loc;
3754 C : Character := Sbuffer (Src_Ptr);
3755 -- Current source program character
3757 function Belong_To_Numeric_Literal (C : Character) return Boolean;
3758 -- Return True if C belongs to a numeric literal
3760 -------------------------------
3761 -- Belong_To_Numeric_Literal --
3762 -------------------------------
3764 function Belong_To_Numeric_Literal (C : Character) return Boolean is
3765 begin
3766 case C is
3767 when '0' .. '9'
3768 | '_' | '.' | 'e' | '#' | 'A' | 'B' | 'C' | 'D' | 'E' | 'F'
3770 return True;
3772 -- Make sure '+' or '-' is part of an exponent.
3774 when '+' | '-' =>
3775 declare
3776 Prev_C : constant Character := Sbuffer (Src_Ptr - 1);
3777 begin
3778 return Prev_C = 'e' or else Prev_C = 'E';
3779 end;
3781 -- All other character doesn't belong to a numeric literal
3783 when others =>
3784 return False;
3785 end case;
3786 end Belong_To_Numeric_Literal;
3788 -- Start of processing for String_From_Numeric_Literal
3790 begin
3791 Start_String;
3792 while Belong_To_Numeric_Literal (C) loop
3793 Store_String_Char (C);
3794 Src_Ptr := Src_Ptr + 1;
3795 C := Sbuffer (Src_Ptr);
3796 end loop;
3798 return End_String;
3799 end String_From_Numeric_Literal;
3801 ---------------
3802 -- Symbol_Of --
3803 ---------------
3805 function Symbol_Of (E : Entity_Id) return String_Id is
3806 Subtype_Symbol : constant String_Id := Symbol_Table.Get (E);
3807 begin
3808 if Subtype_Symbol /= No_String then
3809 return Subtype_Symbol;
3810 else
3811 return From_Dim_To_Str_Of_Unit_Symbols
3812 (Dimensions_Of (E), System_Of (Base_Type (E)));
3813 end if;
3814 end Symbol_Of;
3816 -----------------------
3817 -- Symbol_Table_Hash --
3818 -----------------------
3820 function Symbol_Table_Hash (Key : Entity_Id) return Symbol_Table_Range is
3821 begin
3822 return Symbol_Table_Range (Key mod 511);
3823 end Symbol_Table_Hash;
3825 ---------------
3826 -- System_Of --
3827 ---------------
3829 function System_Of (E : Entity_Id) return System_Type is
3830 Type_Decl : constant Node_Id := Parent (E);
3832 begin
3833 -- Look for Type_Decl in System_Table
3835 for Dim_Sys in 1 .. System_Table.Last loop
3836 if Type_Decl = System_Table.Table (Dim_Sys).Type_Decl then
3837 return System_Table.Table (Dim_Sys);
3838 end if;
3839 end loop;
3841 return Null_System;
3842 end System_Of;
3844 end Sem_Dim;