1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, 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. A string
106 -- literal is legal even in Ada83 mode, where such literals are
109 if Cnam = Name_Import_Address
111 Cnam = Name_Import_Largest_Value
113 Cnam = Name_Import_Value
115 if Etype (Arg1) = Any_Type
116 or else Raises_Constraint_Error (Arg1)
120 elsif Nkind (Arg1) /= N_String_Literal
121 and then not Is_Static_Expression (Arg1)
124 ("call to & requires static string argument!", N, Nam);
125 Why_Not_Static (Arg1);
127 elsif String_Length (Strval (Expr_Value_S (Arg1))) = 0 then
129 ("call to & does not permit null string", N, Nam);
131 elsif OpenVMS_On_Target
132 and then String_Length (Strval (Expr_Value_S (Arg1))) > 31
135 ("argument in call to & must be 31 characters or less", N, Nam);
138 -- Check for the case of freeing a non-null object which will raise
139 -- Constraint_Error. Issue warning here, do the expansion in Exp_Intr.
141 elsif Cnam = Name_Free
142 and then Can_Never_Be_Null (Etype (Arg1))
145 ("freeing `NOT NULL` object will raise Constraint_Error?", N);
147 -- For now, no other special checks are required
152 end Check_Intrinsic_Call;
154 ------------------------------
155 -- Check_Intrinsic_Operator --
156 ------------------------------
158 procedure Check_Intrinsic_Operator (E : Entity_Id; N : Node_Id) is
159 Ret : constant Entity_Id := Etype (E);
160 Nam : constant Name_Id := Chars (E);
165 -- Arithmetic operators
169 Nam = Name_Op_Subtract
171 Nam = Name_Op_Multiply
181 T1 := Etype (First_Formal (E));
183 if No (Next_Formal (First_Formal (E))) then
187 Nam = Name_Op_Subtract
194 -- Previous error in declaration
200 T2 := Etype (Next_Formal (First_Formal (E)));
203 if Root_Type (T1) /= Root_Type (T2)
204 or else Root_Type (T1) /= Root_Type (Ret)
207 ("types of intrinsic operator must have the same size", E, N);
210 -- Comparison operators
212 elsif Nam = Name_Op_Eq
224 T1 := Etype (First_Formal (E));
226 if No (Next_Formal (First_Formal (E))) then
228 -- Previous error in declaration
233 T2 := Etype (Next_Formal (First_Formal (E)));
236 if Root_Type (T1) /= Root_Type (T2) then
238 ("types of intrinsic operator must have the same size", E, N);
241 if Root_Type (Ret) /= Standard_Boolean then
243 ("result type of intrinsic comparison must be boolean", E, N);
248 elsif Nam = Name_Op_Expon then
249 T1 := Etype (First_Formal (E));
251 if No (Next_Formal (First_Formal (E))) then
253 -- Previous error in declaration
258 T2 := Etype (Next_Formal (First_Formal (E)));
261 if not (Is_Integer_Type (T1)
263 Is_Floating_Point_Type (T1))
264 or else Root_Type (T1) /= Root_Type (Ret)
265 or else Root_Type (T2) /= Root_Type (Standard_Integer)
267 Errint ("incorrect operands for intrinsic operator", N, E);
270 -- All other operators (are there any?) are not handled
273 Errint ("incorrect context for ""Intrinsic"" convention", E, N);
277 if not Is_Numeric_Type (T1) then
278 Errint ("intrinsic operator can only apply to numeric types", E, N);
280 end Check_Intrinsic_Operator;
282 --------------------------------
283 -- Check_Intrinsic_Subprogram --
284 --------------------------------
286 procedure Check_Intrinsic_Subprogram (E : Entity_Id; N : Node_Id) is
287 Spec : constant Node_Id := Specification (Unit_Declaration_Node (E));
292 and then Present (Generic_Parent (Spec))
294 Nam := Chars (Generic_Parent (Spec));
299 -- Check name is valid intrinsic name
301 Get_Name_String (Nam);
303 if Name_Buffer (1) /= 'O'
304 and then Nam /= Name_Asm
305 and then Nam /= Name_To_Address
306 and then Nam not in First_Intrinsic_Name .. Last_Intrinsic_Name
308 Errint ("unrecognized intrinsic subprogram", E, N);
310 -- We always allow intrinsic specifications in language defined units
311 -- and in expanded code. We assume that the GNAT implementors know what
312 -- they are doing, and do not write or generate junk use of intrinsic!
314 elsif not Comes_From_Source (E)
315 or else not Comes_From_Source (N)
316 or else Is_Predefined_File_Name
317 (Unit_File_Name (Get_Source_Unit (N)))
321 -- Shift cases. We allow user specification of intrinsic shift
322 -- operators for any numeric types.
325 Nam = Name_Rotate_Left
327 Nam = Name_Rotate_Right
329 Nam = Name_Shift_Left
331 Nam = Name_Shift_Right
333 Nam = Name_Shift_Right_Arithmetic
338 Nam = Name_Exception_Information
340 Nam = Name_Exception_Message
342 Nam = Name_Exception_Name
344 Check_Exception_Function (E, N);
346 elsif Nkind (E) = N_Defining_Operator_Symbol then
347 Check_Intrinsic_Operator (E, N);
349 elsif Nam = Name_File
350 or else Nam = Name_Line
351 or else Nam = Name_Source_Location
352 or else Nam = Name_Enclosing_Entity
356 -- For now, no other intrinsic subprograms are recognized in user code
359 Errint ("incorrect context for ""Intrinsic"" convention", E, N);
361 end Check_Intrinsic_Subprogram;
367 procedure Check_Shift (E : Entity_Id; N : Node_Id) is
377 if Ekind (E) /= E_Function
378 and then Ekind (E) /= E_Generic_Function
380 Errint ("intrinsic shift subprogram must be a function", E, N);
384 Arg1 := First_Formal (E);
386 if Present (Arg1) then
387 Arg2 := Next_Formal (Arg1);
392 if Arg1 = Empty or else Arg2 = Empty then
393 Errint ("intrinsic shift function must have two arguments", E, N);
397 Typ1 := Etype (Arg1);
398 Typ2 := Etype (Arg2);
400 Ptyp1 := Parameter_Type (Parent (Arg1));
401 Ptyp2 := Parameter_Type (Parent (Arg2));
403 if not Is_Integer_Type (Typ1) then
404 Errint ("first argument to shift must be integer type", Ptyp1, N);
408 if Typ2 /= Standard_Natural then
409 Errint ("second argument to shift must be type Natural", Ptyp2, N);
413 Size := UI_To_Int (Esize (Typ1));
421 ("first argument for shift must have size 8, 16, 32 or 64",
425 elsif Non_Binary_Modulus (Typ1) then
427 ("shifts not allowed for non-binary modular types",
430 elsif Etype (Arg1) /= Etype (E) then
432 ("first argument of shift must match return type", Ptyp1, N);
441 procedure Errint (Msg : String; S : Node_Id; N : Node_Id) is
443 Error_Msg_N (Msg, S);
444 Error_Msg_N ("incorrect intrinsic subprogram, see spec", N);