1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 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. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 -- Processing for intrinsic subprogram declarations
28 with Atree; use Atree;
29 with Einfo; use Einfo;
30 with Errout; use Errout;
31 with Fname; use Fname;
33 with Namet; use Namet;
34 with Sem_Eval; use Sem_Eval;
35 with Sem_Util; use Sem_Util;
36 with Sinfo; use Sinfo;
37 with Snames; use Snames;
38 with Stand; use Stand;
39 with Stringt; use Stringt;
40 with Targparm; use Targparm;
41 with Uintp; use Uintp;
43 package body Sem_Intr is
45 -----------------------
46 -- Local Subprograms --
47 -----------------------
49 procedure Check_Exception_Function (E : Entity_Id; N : Node_Id);
50 -- Check use of intrinsic Exception_Message, Exception_Info or
51 -- Exception_Name, as used in the DEC compatible Current_Exceptions
52 -- package. In each case we must have a parameterless function that
53 -- returns type String.
55 procedure Check_Intrinsic_Operator (E : Entity_Id; N : Node_Id);
56 -- Check that operator is one of the binary arithmetic operators, and
57 -- that the types involved have the same size.
59 procedure Check_Shift (E : Entity_Id; N : Node_Id);
60 -- Check intrinsic shift subprogram, the two arguments are the same
61 -- as for Check_Intrinsic_Subprogram (i.e. the entity of the subprogram
62 -- declaration, and the node for the pragma argument, used for messages)
64 procedure Errint (Msg : String; S : Node_Id; N : Node_Id);
65 -- Post error message for bad intrinsic, the message itself is posted
66 -- on the appropriate spec node and another message is placed on the
67 -- pragma itself, referring to the spec. S is the node in the spec on
68 -- which the message is to be placed, and N is the pragma argument node.
70 ------------------------------
71 -- Check_Exception_Function --
72 ------------------------------
74 procedure Check_Exception_Function (E : Entity_Id; N : Node_Id) is
76 if Ekind (E) /= E_Function
77 and then Ekind (E) /= E_Generic_Function
80 ("intrinsic exception subprogram must be a function", E, N);
82 elsif Present (First_Formal (E)) then
84 ("intrinsic exception subprogram may not have parameters",
88 elsif Etype (E) /= Standard_String then
90 ("return type of exception subprogram must be String", E, N);
93 end Check_Exception_Function;
95 --------------------------
96 -- Check_Intrinsic_Call --
97 --------------------------
99 procedure Check_Intrinsic_Call (N : Node_Id) is
100 Nam : constant Entity_Id := Entity (Name (N));
101 Cnam : constant Name_Id := Chars (Nam);
102 Arg1 : constant Node_Id := First_Actual (N);
105 -- For Import_xxx calls, argument must be static string
107 if Cnam = Name_Import_Address
109 Cnam = Name_Import_Largest_Value
111 Cnam = Name_Import_Value
113 if Etype (Arg1) = Any_Type
114 or else Raises_Constraint_Error (Arg1)
118 elsif not Is_Static_Expression (Arg1) then
120 ("call to & requires static string argument!", N, Nam);
121 Why_Not_Static (Arg1);
123 elsif String_Length (Strval (Expr_Value_S (Arg1))) = 0 then
125 ("call to & does not permit null string", N, Nam);
127 elsif OpenVMS_On_Target
128 and then String_Length (Strval (Expr_Value_S (Arg1))) > 31
131 ("argument in call to & must be 31 characters or less", N, Nam);
134 -- Check for the case of freeing a non-null object which will raise
135 -- Constaint_Error. Issue warning here, do the expansion in Exp_Intr.
137 elsif Cnam = Name_Free
138 and then Can_Never_Be_Null (Etype (Arg1))
141 ("freeing `NOT NULL` object will raise Constraint_Error?", N);
143 -- For now, no other special checks are required
148 end Check_Intrinsic_Call;
150 ------------------------------
151 -- Check_Intrinsic_Operator --
152 ------------------------------
154 procedure Check_Intrinsic_Operator (E : Entity_Id; N : Node_Id) is
155 Ret : constant Entity_Id := Etype (E);
156 Nam : constant Name_Id := Chars (E);
161 -- Aritnmetic operators
165 Nam = Name_Op_Subtract
167 Nam = Name_Op_Multiply
177 T1 := Etype (First_Formal (E));
179 if No (Next_Formal (First_Formal (E))) then
183 Nam = Name_Op_Subtract
190 -- Previous error in declaration
196 T2 := Etype (Next_Formal (First_Formal (E)));
199 if Root_Type (T1) /= Root_Type (T2)
200 or else Root_Type (T1) /= Root_Type (Ret)
203 ("types of intrinsic operator must have the same size", E, N);
206 -- Comparison operators
208 elsif Nam = Name_Op_Eq
220 T1 := Etype (First_Formal (E));
222 if No (Next_Formal (First_Formal (E))) then
224 -- Previous error in declaration
229 T2 := Etype (Next_Formal (First_Formal (E)));
232 if Root_Type (T1) /= Root_Type (T2) then
234 ("types of intrinsic operator must have the same size", E, N);
237 if Root_Type (Ret) /= Standard_Boolean then
239 ("result type of intrinsic comparison must be boolean", E, N);
244 elsif Nam = Name_Op_Expon then
245 T1 := Etype (First_Formal (E));
247 if No (Next_Formal (First_Formal (E))) then
249 -- Previous error in declaration
254 T2 := Etype (Next_Formal (First_Formal (E)));
257 if not (Is_Integer_Type (T1)
259 Is_Floating_Point_Type (T1))
260 or else Root_Type (T1) /= Root_Type (Ret)
261 or else Root_Type (T2) /= Root_Type (Standard_Integer)
263 Errint ("incorrect operands for intrinsic operator", N, E);
266 -- All other operators (are there any?) are not handled
269 Errint ("incorrect context for ""Intrinsic"" convention", E, N);
273 if not Is_Numeric_Type (T1) then
274 Errint ("intrinsic operator can only apply to numeric types", E, N);
276 end Check_Intrinsic_Operator;
278 --------------------------------
279 -- Check_Intrinsic_Subprogram --
280 --------------------------------
282 procedure Check_Intrinsic_Subprogram (E : Entity_Id; N : Node_Id) is
283 Spec : constant Node_Id := Specification (Unit_Declaration_Node (E));
288 and then Present (Generic_Parent (Spec))
290 Nam := Chars (Generic_Parent (Spec));
295 -- Check name is valid intrinsic name
297 Get_Name_String (Nam);
299 if Name_Buffer (1) /= 'O'
300 and then Nam /= Name_Asm
301 and then Nam /= Name_To_Address
302 and then Nam not in First_Intrinsic_Name .. Last_Intrinsic_Name
304 Errint ("unrecognized intrinsic subprogram", E, N);
306 -- We always allow intrinsic specifications in language defined units
307 -- and in expanded code. We assume that the GNAT implemetors know what
308 -- they are doing, and do not write or generate junk use of intrinsic!
310 elsif not Comes_From_Source (E)
311 or else not Comes_From_Source (N)
312 or else Is_Predefined_File_Name
313 (Unit_File_Name (Get_Source_Unit (N)))
317 -- Shift cases. We allow user specification of intrinsic shift
318 -- operators for any numeric types.
321 Nam = Name_Rotate_Left
323 Nam = Name_Rotate_Right
325 Nam = Name_Shift_Left
327 Nam = Name_Shift_Right
329 Nam = Name_Shift_Right_Arithmetic
334 Nam = Name_Exception_Information
336 Nam = Name_Exception_Message
338 Nam = Name_Exception_Name
340 Check_Exception_Function (E, N);
342 elsif Nkind (E) = N_Defining_Operator_Symbol then
343 Check_Intrinsic_Operator (E, N);
345 elsif Nam = Name_File
346 or else Nam = Name_Line
347 or else Nam = Name_Source_Location
348 or else Nam = Name_Enclosing_Entity
352 -- For now, no other intrinsic subprograms are recognized in user code
355 Errint ("incorrect context for ""Intrinsic"" convention", E, N);
357 end Check_Intrinsic_Subprogram;
363 procedure Check_Shift (E : Entity_Id; N : Node_Id) is
373 if Ekind (E) /= E_Function
374 and then Ekind (E) /= E_Generic_Function
376 Errint ("intrinsic shift subprogram must be a function", E, N);
380 Arg1 := First_Formal (E);
382 if Present (Arg1) then
383 Arg2 := Next_Formal (Arg1);
388 if Arg1 = Empty or else Arg2 = Empty then
389 Errint ("intrinsic shift function must have two arguments", E, N);
393 Typ1 := Etype (Arg1);
394 Typ2 := Etype (Arg2);
396 Ptyp1 := Parameter_Type (Parent (Arg1));
397 Ptyp2 := Parameter_Type (Parent (Arg2));
399 if not Is_Integer_Type (Typ1) then
400 Errint ("first argument to shift must be integer type", Ptyp1, N);
404 if Typ2 /= Standard_Natural then
405 Errint ("second argument to shift must be type Natural", Ptyp2, N);
409 Size := UI_To_Int (Esize (Typ1));
417 ("first argument for shift must have size 8, 16, 32 or 64",
421 elsif Is_Modular_Integer_Type (Typ1)
422 and then Non_Binary_Modulus (Typ1)
425 ("shifts not allowed for non-binary modular types",
428 elsif Etype (Arg1) /= Etype (E) then
430 ("first argument of shift must match return type", Ptyp1, N);
439 procedure Errint (Msg : String; S : Node_Id; N : Node_Id) is
441 Error_Msg_N (Msg, S);
442 Error_Msg_N ("incorrect intrinsic subprogram, see spec", N);