1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2004 Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 -- The Par.Load procedure loads all units that are definitely required before
28 -- it makes any sense at all to proceed with semantic analysis, including
29 -- with'ed units, corresponding specs for bodies, parents of child specs,
30 -- and parents of subunits. All these units are loaded and pointers installed
31 -- in the tree as described in the spec of package Lib.
33 with Fname; use Fname;
34 with Fname.UF; use Fname.UF;
35 with Lib.Load; use Lib.Load;
36 with Uname; use Uname;
37 with Namet; use Namet;
38 with Casing; use Casing;
40 with Osint; use Osint;
41 with Sinput.L; use Sinput.L;
42 with Stylesw; use Stylesw;
43 with Validsw; use Validsw;
45 with GNAT.Spelling_Checker; use GNAT.Spelling_Checker;
50 File_Name : File_Name_Type;
51 -- Name of file for current unit, derived from unit name
53 Cur_Unum : constant Unit_Number_Type := Current_Source_Unit;
54 -- Unit number of unit that we just finished parsing. Note that we need
55 -- to capture this, because Source_Unit will change as we parse new
56 -- source files in the multiple main source file case.
58 Curunit : constant Node_Id := Cunit (Cur_Unum);
59 -- Compilation unit node for current compilation unit
61 Loc : Source_Ptr := Sloc (Curunit);
62 -- Source location for compilation unit node
64 Save_Style_Check : Boolean;
65 Save_Style_Checks : Style_Check_Options;
66 -- Save style check so it can be restored later
68 Save_Validity_Check : Boolean;
69 Save_Validity_Checks : Validity_Check_Options;
70 -- Save validity check so it can be restored later
73 -- Compilation unit node for withed unit
75 Context_Node : Node_Id;
76 -- Next node in context items list
81 Spec_Name : Unit_Name_Type;
82 -- Unit name of required spec
84 Body_Name : Unit_Name_Type;
85 -- Unit name of corresponding body
87 Unum : Unit_Number_Type;
88 -- Unit number of loaded unit
90 function Same_File_Name_Except_For_Case
91 (Expected_File_Name : File_Name_Type;
92 Actual_File_Name : File_Name_Type) return Boolean;
93 -- Given an actual file name and an expected file name (the latter being
94 -- derived from the unit name), determine if they are the same except for
95 -- possibly different casing of letters.
97 ------------------------------------
98 -- Same_File_Name_Except_For_Case --
99 ------------------------------------
101 function Same_File_Name_Except_For_Case
102 (Expected_File_Name : File_Name_Type;
103 Actual_File_Name : File_Name_Type) return Boolean
106 Get_Name_String (Actual_File_Name);
107 Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
110 Lower_Case_Actual_File_Name : String (1 .. Name_Len);
113 Lower_Case_Actual_File_Name := Name_Buffer (1 .. Name_Len);
114 Get_Name_String (Expected_File_Name);
115 Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
116 return Lower_Case_Actual_File_Name = Name_Buffer (1 .. Name_Len);
119 end Same_File_Name_Except_For_Case;
121 -- Start of processing for Load
124 -- Don't do any loads if we already had a fatal error
126 if Fatal_Error (Cur_Unum) then
130 Save_Style_Check_Options (Save_Style_Checks);
131 Save_Style_Check := Opt.Style_Check;
133 Save_Validity_Check_Options (Save_Validity_Checks);
134 Save_Validity_Check := Opt.Validity_Checks_On;
136 -- If main unit, set Main_Unit_Entity (this will get overwritten if
137 -- the main unit has a separate spec, that happens later on in Load)
139 if Cur_Unum = Main_Unit then
140 Main_Unit_Entity := Cunit_Entity (Main_Unit);
143 -- If we have no unit name, things are seriously messed up by previous
144 -- errors, and we should not try to continue compilation.
146 if Unit_Name (Cur_Unum) = No_Name then
147 raise Unrecoverable_Error;
150 -- Next step, make sure that the unit name matches the file name
151 -- and issue a warning message if not. We only output this for the
152 -- main unit, since for other units it is more serious and is
153 -- caught in a separate test below.
157 (Unit_Name (Cur_Unum),
158 Subunit => Nkind (Unit (Cunit (Cur_Unum))) = N_Subunit);
160 if Cur_Unum = Main_Unit
161 and then File_Name /= Unit_File_Name (Cur_Unum)
162 and then (File_Names_Case_Sensitive
163 or not Same_File_Name_Except_For_Case
164 (File_Name, Unit_File_Name (Cur_Unum)))
166 Error_Msg_Name_1 := File_Name;
168 ("?file name does not match unit name, should be{", Sloc (Curunit));
171 -- For units other than the main unit, the expected unit name is set and
172 -- must be the same as the actual unit name, or we are in big trouble, and
173 -- abandon the compilation since there are situations where this really
174 -- gets us into bad trouble (e.g. some subunit situations).
176 if Cur_Unum /= Main_Unit
177 and then Expected_Unit (Cur_Unum) /= Unit_Name (Cur_Unum)
179 Loc := Error_Location (Cur_Unum);
180 Error_Msg_Name_1 := Unit_File_Name (Cur_Unum);
181 Get_Name_String (Error_Msg_Name_1);
183 -- Check for predefined file case
186 and then Name_Buffer (2) = '-'
187 and then (Name_Buffer (1) = 'a'
189 Name_Buffer (1) = 's'
191 Name_Buffer (1) = 'i'
193 Name_Buffer (1) = 'g')
196 Expect_Name : constant Name_Id := Expected_Unit (Cur_Unum);
197 Actual_Name : constant Name_Id := Unit_Name (Cur_Unum);
200 Error_Msg_Name_1 := Expect_Name;
201 Error_Msg ("% is not a predefined library unit!", Loc);
203 -- In the predefined file case, we know the user did not
204 -- construct their own package, but we got the wrong one.
205 -- This means that the name supplied by the user crunched
206 -- to something we recognized, but then the file did not
207 -- contain the unit expected. Most likely this is due to
208 -- a misspelling, e.g.
210 -- with Ada.Calender;
212 -- This crunches to a-calend, which indeed contains the unit
213 -- Ada.Calendar, and we can diagnose the misspelling. This
214 -- is a simple heuristic, but it catches many common cases
215 -- of misspelling of predefined unit names without needing
216 -- a full list of them.
218 -- Before actually issinying the message, we will check that the
219 -- unit name is indeed a plausible misspelling of the one we got.
221 if Is_Bad_Spelling_Of
222 (Found => Get_Name_String (Expect_Name),
223 Expect => Get_Name_String (Actual_Name))
225 Error_Msg_Name_1 := Actual_Name;
226 Error_Msg ("possible misspelling of %!", Loc);
230 -- Non-predefined file name case. In this case we generate a message
231 -- and then we quit, because we are in big trouble, and if we try
232 -- to continue compilation, we get into some nasty situations
233 -- (for example in some subunit cases).
236 Error_Msg ("file { does not contain expected unit!", Loc);
237 Error_Msg_Unit_1 := Expected_Unit (Cur_Unum);
238 Error_Msg ("expected unit $!", Loc);
239 Error_Msg_Unit_1 := Unit_Name (Cur_Unum);
240 Error_Msg ("found unit $!", Loc);
243 -- In both cases, remove the unit if it is the last unit (which it
244 -- normally (always?) will be) so that it is out of the way later.
246 Remove_Unit (Cur_Unum);
249 -- If current unit is a body, load its corresponding spec
251 if Nkind (Unit (Curunit)) = N_Package_Body
252 or else Nkind (Unit (Curunit)) = N_Subprogram_Body
254 Spec_Name := Get_Spec_Name (Unit_Name (Cur_Unum));
257 (Load_Name => Spec_Name,
260 Error_Node => Curunit,
261 Corr_Body => Cur_Unum);
263 -- If we successfully load the unit, then set the spec pointer. Once
264 -- again note that if the loaded unit has a fatal error, Load will
265 -- have set our Fatal_Error flag to propagate this condition.
267 if Unum /= No_Unit then
268 Set_Library_Unit (Curunit, Cunit (Unum));
270 -- If this is a separate spec for the main unit, then we reset
271 -- Main_Unit_Entity to point to the entity for this separate spec
273 if Cur_Unum = Main_Unit then
274 Main_Unit_Entity := Cunit_Entity (Unum);
277 -- If we don't find the spec, then if we have a subprogram body, we
278 -- are still OK, we just have a case of a body acting as its own spec
280 elsif Nkind (Unit (Curunit)) = N_Subprogram_Body then
281 Set_Acts_As_Spec (Curunit, True);
282 Set_Library_Unit (Curunit, Curunit);
284 -- Otherwise we do have an error, repeat the load request for the spec
285 -- with Required set True to generate an appropriate error message.
290 (Load_Name => Spec_Name,
293 Error_Node => Curunit);
297 -- If current unit is a child unit spec, load its parent
299 elsif Nkind (Unit (Curunit)) = N_Package_Declaration
300 or else Nkind (Unit (Curunit)) = N_Subprogram_Declaration
301 or else Nkind (Unit (Curunit)) in N_Generic_Declaration
302 or else Nkind (Unit (Curunit)) in N_Generic_Instantiation
303 or else Nkind (Unit (Curunit)) in N_Renaming_Declaration
305 -- Turn style and validity checks off for parent unit
307 if not GNAT_Mode then
308 Reset_Style_Check_Options;
309 Reset_Validity_Check_Options;
312 Spec_Name := Get_Parent_Spec_Name (Unit_Name (Cur_Unum));
314 if Spec_Name /= No_Name then
317 (Load_Name => Spec_Name,
320 Error_Node => Curunit);
322 if Unum /= No_Unit then
323 Set_Parent_Spec (Unit (Curunit), Cunit (Unum));
327 -- If current unit is a subunit, then load its parent body
329 elsif Nkind (Unit (Curunit)) = N_Subunit then
330 Body_Name := Get_Parent_Body_Name (Unit_Name (Cur_Unum));
333 (Load_Name => Body_Name,
336 Error_Node => Name (Unit (Curunit)));
338 if Unum /= No_Unit then
339 Set_Library_Unit (Curunit, Cunit (Unum));
344 -- Now we load with'ed units, with style/validity checks turned off
346 if not GNAT_Mode then
347 Reset_Style_Check_Options;
348 Reset_Validity_Check_Options;
351 -- Loop through context items
353 Context_Node := First (Context_Items (Curunit));
354 while Present (Context_Node) loop
356 if Nkind (Context_Node) = N_With_Clause then
357 With_Node := Context_Node;
358 Spec_Name := Get_Unit_Name (With_Node);
362 (Load_Name => Spec_Name,
365 Error_Node => With_Node,
368 -- If we find the unit, then set spec pointer in the N_With_Clause
369 -- to point to the compilation unit for the spec. Remember that
370 -- the Load routine itself sets our Fatal_Error flag if the loaded
371 -- unit gets a fatal error, so we don't need to worry about that.
373 if Unum /= No_Unit then
374 Set_Library_Unit (With_Node, Cunit (Unum));
376 -- If the spec isn't found, then try finding the corresponding
377 -- body, since it is possible that we have a subprogram body
378 -- that is acting as a spec (since no spec is present).
381 Body_Name := Get_Body_Name (Spec_Name);
384 (Load_Name => Body_Name,
387 Error_Node => With_Node,
390 -- If we got a subprogram body, then mark that we are using
391 -- the body as a spec in the file table, and set the spec
392 -- pointer in the N_With_Clause to point to the body entity.
395 and then Nkind (Unit (Cunit (Unum))) = N_Subprogram_Body
397 With_Cunit := Cunit (Unum);
398 Set_Library_Unit (With_Node, With_Cunit);
399 Set_Acts_As_Spec (With_Cunit, True);
400 Set_Library_Unit (With_Cunit, With_Cunit);
402 -- If we couldn't find the body, or if it wasn't a body spec
403 -- then we are in trouble. We make one more call to Load to
404 -- require the spec. We know it will fail of course, the
405 -- purpose is to generate the required error message (we prefer
406 -- that this message refer to the missing spec, not the body)
411 (Load_Name => Spec_Name,
414 Error_Node => With_Node,
417 -- Here we create a dummy package unit for the missing unit
419 Unum := Create_Dummy_Package_Unit (With_Node, Spec_Name);
420 Set_Library_Unit (With_Node, Cunit (Unum));
428 -- Restore style/validity check mode for main unit
430 Set_Style_Check_Options (Save_Style_Checks);
431 Opt.Style_Check := Save_Style_Check;
432 Set_Validity_Check_Options (Save_Validity_Checks);
433 Opt.Validity_Checks_On := Save_Validity_Check;