1 /* Separate lexical analyzer for GNU C++.
2 Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* This file is the lexical analyzer for GNU C++. */
28 #include "coretypes.h"
35 #include "c-family/c-pragma.h"
41 static int interface_strcmp (const char *);
42 static void init_cp_pragma (void);
44 static tree
parse_strconst_pragma (const char *, int);
45 static void handle_pragma_vtable (cpp_reader
*);
46 static void handle_pragma_unit (cpp_reader
*);
47 static void handle_pragma_interface (cpp_reader
*);
48 static void handle_pragma_implementation (cpp_reader
*);
49 static void handle_pragma_java_exceptions (cpp_reader
*);
51 static void init_operators (void);
52 static void copy_lang_type (tree
);
54 /* A constraint that can be tested at compile time. */
55 #define CONSTRAINT(name, expr) extern int constraint_##name [(expr) ? 1 : -1]
57 /* Functions and data structures for #pragma interface.
59 `#pragma implementation' means that the main file being compiled
60 is considered to implement (provide) the classes that appear in
61 its main body. I.e., if this is file "foo.cc", and class `bar'
62 is defined in "foo.cc", then we say that "foo.cc implements bar".
64 All main input files "implement" themselves automagically.
66 `#pragma interface' means that unless this file (of the form "foo.h"
67 is not presently being included by file "foo.cc", the
68 CLASSTYPE_INTERFACE_ONLY bit gets set. The effect is that none
69 of the vtables nor any of the inline functions defined in foo.h
72 There are cases when we want to link files such as "defs.h" and
73 "main.cc". In this case, we give "defs.h" a `#pragma interface',
74 and "main.cc" has `#pragma implementation "defs.h"'. */
79 struct impl_files
*next
;
82 static struct impl_files
*impl_file_chain
;
84 /* True if we saw "#pragma GCC java_exceptions". */
85 bool pragma_java_exceptions
;
93 /* A mapping from tree codes to operator name information. */
94 operator_name_info_t operator_name_info
[(int) MAX_TREE_CODES
];
95 /* Similar, but for assignment operators. */
96 operator_name_info_t assignment_operator_name_info
[(int) MAX_TREE_CODES
];
98 /* Initialize data structures that keep track of operator names. */
100 #define DEF_OPERATOR(NAME, C, M, AR, AP) \
101 CONSTRAINT (C, sizeof "operator " + sizeof NAME <= 256);
102 #include "operators.def"
106 init_operators (void)
110 struct operator_name_info_t
*oni
;
112 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
113 sprintf (buffer, ISALPHA (NAME[0]) ? "operator %s" : "operator%s", NAME); \
114 identifier = get_identifier (buffer); \
115 IDENTIFIER_OPNAME_P (identifier) = 1; \
118 ? &assignment_operator_name_info[(int) CODE] \
119 : &operator_name_info[(int) CODE]); \
120 oni->identifier = identifier; \
122 oni->mangled_name = MANGLING; \
125 #include "operators.def"
128 operator_name_info
[(int) ERROR_MARK
].identifier
129 = get_identifier ("<invalid operator>");
131 /* Handle some special cases. These operators are not defined in
132 the language, but can be produced internally. We may need them
133 for error-reporting. (Eventually, we should ensure that this
134 does not happen. Error messages involving these operators will
135 be confusing to users.) */
137 operator_name_info
[(int) INIT_EXPR
].name
138 = operator_name_info
[(int) MODIFY_EXPR
].name
;
139 operator_name_info
[(int) EXACT_DIV_EXPR
].name
= "(ceiling /)";
140 operator_name_info
[(int) CEIL_DIV_EXPR
].name
= "(ceiling /)";
141 operator_name_info
[(int) FLOOR_DIV_EXPR
].name
= "(floor /)";
142 operator_name_info
[(int) ROUND_DIV_EXPR
].name
= "(round /)";
143 operator_name_info
[(int) CEIL_MOD_EXPR
].name
= "(ceiling %)";
144 operator_name_info
[(int) FLOOR_MOD_EXPR
].name
= "(floor %)";
145 operator_name_info
[(int) ROUND_MOD_EXPR
].name
= "(round %)";
146 operator_name_info
[(int) ABS_EXPR
].name
= "abs";
147 operator_name_info
[(int) TRUTH_AND_EXPR
].name
= "strict &&";
148 operator_name_info
[(int) TRUTH_OR_EXPR
].name
= "strict ||";
149 operator_name_info
[(int) RANGE_EXPR
].name
= "...";
150 operator_name_info
[(int) UNARY_PLUS_EXPR
].name
= "+";
152 assignment_operator_name_info
[(int) EXACT_DIV_EXPR
].name
154 assignment_operator_name_info
[(int) CEIL_DIV_EXPR
].name
156 assignment_operator_name_info
[(int) FLOOR_DIV_EXPR
].name
158 assignment_operator_name_info
[(int) ROUND_DIV_EXPR
].name
160 assignment_operator_name_info
[(int) CEIL_MOD_EXPR
].name
162 assignment_operator_name_info
[(int) FLOOR_MOD_EXPR
].name
164 assignment_operator_name_info
[(int) ROUND_MOD_EXPR
].name
168 /* Initialize the reserved words. */
177 if (cxx_dialect
!= cxx0x
)
180 mask
|= D_ASM
| D_EXT
;
181 if (flag_no_gnu_keywords
)
184 /* The Objective-C keywords are all context-dependent. */
187 ridpointers
= ggc_alloc_cleared_vec_tree ((int) RID_MAX
);
188 for (i
= 0; i
< num_c_common_reswords
; i
++)
190 if (c_common_reswords
[i
].disable
& D_CONLY
)
192 id
= get_identifier (c_common_reswords
[i
].word
);
193 C_SET_RID_CODE (id
, c_common_reswords
[i
].rid
);
194 ridpointers
[(int) c_common_reswords
[i
].rid
] = id
;
195 if (! (c_common_reswords
[i
].disable
& mask
))
196 C_IS_RESERVED_WORD (id
) = 1;
201 init_cp_pragma (void)
203 c_register_pragma (0, "vtable", handle_pragma_vtable
);
204 c_register_pragma (0, "unit", handle_pragma_unit
);
205 c_register_pragma (0, "interface", handle_pragma_interface
);
206 c_register_pragma (0, "implementation", handle_pragma_implementation
);
207 c_register_pragma ("GCC", "interface", handle_pragma_interface
);
208 c_register_pragma ("GCC", "implementation", handle_pragma_implementation
);
209 c_register_pragma ("GCC", "java_exceptions", handle_pragma_java_exceptions
);
212 /* TRUE if a code represents a statement. */
214 bool statement_code_p
[MAX_TREE_CODES
];
216 /* Initialize the C++ front end. This function is very sensitive to
217 the exact order that things are done here. It would be nice if the
218 initialization done by this routine were moved to its subroutines,
219 and the ordering dependencies clarified and reduced. */
223 location_t saved_loc
;
225 static const enum tree_code stmt_codes
[] = {
226 CTOR_INITIALIZER
, TRY_BLOCK
, HANDLER
,
227 EH_SPEC_BLOCK
, USING_STMT
, TAG_DEFN
,
228 IF_STMT
, CLEANUP_STMT
, FOR_STMT
,
229 RANGE_FOR_STMT
, WHILE_STMT
, DO_STMT
,
230 BREAK_STMT
, CONTINUE_STMT
, SWITCH_STMT
,
234 memset (&statement_code_p
, 0, sizeof (statement_code_p
));
235 for (i
= 0; i
< ARRAY_SIZE (stmt_codes
); i
++)
236 statement_code_p
[stmt_codes
[i
]] = true;
238 saved_loc
= input_location
;
239 input_location
= BUILTINS_LOCATION
;
243 init_cp_semantics ();
248 current_function_decl
= NULL
;
250 class_type_node
= ridpointers
[(int) RID_CLASS
];
252 cxx_init_decl_processing ();
254 if (c_common_init () == false)
256 input_location
= saved_loc
;
264 input_location
= saved_loc
;
268 /* Return nonzero if S is not considered part of an
269 INTERFACE/IMPLEMENTATION pair. Otherwise, return 0. */
272 interface_strcmp (const char* s
)
274 /* Set the interface/implementation bits for this scope. */
275 struct impl_files
*ifiles
;
278 for (ifiles
= impl_file_chain
; ifiles
; ifiles
= ifiles
->next
)
280 const char *t1
= ifiles
->filename
;
283 if (*s1
!= *t1
|| *s1
== 0)
286 while (*s1
== *t1
&& *s1
!= 0)
293 /* Don't get faked out by xxx.yyy.cc vs xxx.zzz.cc. */
294 if (strchr (s1
, '.') || strchr (t1
, '.'))
297 if (*s1
== '\0' || s1
[-1] != '.' || t1
[-1] != '.')
310 /* Parse a #pragma whose sole argument is a string constant.
311 If OPT is true, the argument is optional. */
313 parse_strconst_pragma (const char* name
, int opt
)
318 t
= pragma_lex (&result
);
321 if (pragma_lex (&x
) != CPP_EOF
)
322 warning (0, "junk at end of #pragma %s", name
);
326 if (t
== CPP_EOF
&& opt
)
329 error ("invalid #pragma %s", name
);
330 return error_mark_node
;
334 handle_pragma_vtable (cpp_reader
* dfile ATTRIBUTE_UNUSED
)
336 parse_strconst_pragma ("vtable", 0);
337 sorry ("#pragma vtable no longer supported");
341 handle_pragma_unit (cpp_reader
* dfile ATTRIBUTE_UNUSED
)
343 /* Validate syntax, but don't do anything. */
344 parse_strconst_pragma ("unit", 0);
348 handle_pragma_interface (cpp_reader
* dfile ATTRIBUTE_UNUSED
)
350 tree fname
= parse_strconst_pragma ("interface", 1);
351 struct c_fileinfo
*finfo
;
352 const char *filename
;
354 if (fname
== error_mark_node
)
357 filename
= lbasename (input_filename
);
359 filename
= TREE_STRING_POINTER (fname
);
361 finfo
= get_fileinfo (input_filename
);
363 if (impl_file_chain
== 0)
365 /* If this is zero at this point, then we are
366 auto-implementing. */
367 if (main_input_filename
== 0)
368 main_input_filename
= input_filename
;
371 finfo
->interface_only
= interface_strcmp (filename
);
372 /* If MULTIPLE_SYMBOL_SPACES is set, we cannot assume that we can see
373 a definition in another file. */
374 if (!MULTIPLE_SYMBOL_SPACES
|| !finfo
->interface_only
)
375 finfo
->interface_unknown
= 0;
378 /* Note that we have seen a #pragma implementation for the key MAIN_FILENAME.
379 We used to only allow this at toplevel, but that restriction was buggy
380 in older compilers and it seems reasonable to allow it in the headers
381 themselves, too. It only needs to precede the matching #p interface.
383 We don't touch finfo->interface_only or finfo->interface_unknown;
384 the user must specify a matching #p interface for this to have
388 handle_pragma_implementation (cpp_reader
* dfile ATTRIBUTE_UNUSED
)
390 tree fname
= parse_strconst_pragma ("implementation", 1);
391 const char *filename
;
392 struct impl_files
*ifiles
= impl_file_chain
;
394 if (fname
== error_mark_node
)
399 if (main_input_filename
)
400 filename
= main_input_filename
;
402 filename
= input_filename
;
403 filename
= lbasename (filename
);
407 filename
= TREE_STRING_POINTER (fname
);
408 if (cpp_included_before (parse_in
, filename
, input_location
))
409 warning (0, "#pragma implementation for %qs appears after "
410 "file is included", filename
);
413 for (; ifiles
; ifiles
= ifiles
->next
)
415 if (! strcmp (ifiles
->filename
, filename
))
420 ifiles
= XNEW (struct impl_files
);
421 ifiles
->filename
= xstrdup (filename
);
422 ifiles
->next
= impl_file_chain
;
423 impl_file_chain
= ifiles
;
427 /* Indicate that this file uses Java-personality exception handling. */
429 handle_pragma_java_exceptions (cpp_reader
* dfile ATTRIBUTE_UNUSED
)
432 if (pragma_lex (&x
) != CPP_EOF
)
433 warning (0, "junk at end of #pragma GCC java_exceptions");
435 choose_personality_routine (lang_java
);
436 pragma_java_exceptions
= true;
439 /* Issue an error message indicating that the lookup of NAME (an
440 IDENTIFIER_NODE) failed. Returns the ERROR_MARK_NODE. */
443 unqualified_name_lookup_error (tree name
)
445 if (IDENTIFIER_OPNAME_P (name
))
447 if (name
!= ansi_opname (ERROR_MARK
))
448 error ("%qD not defined", name
);
452 error ("%qD was not declared in this scope", name
);
453 /* Prevent repeated error messages by creating a VAR_DECL with
454 this NAME in the innermost block scope. */
455 if (current_function_decl
)
458 decl
= build_decl (input_location
,
459 VAR_DECL
, name
, error_mark_node
);
460 DECL_CONTEXT (decl
) = current_function_decl
;
461 push_local_binding (name
, decl
, 0);
462 /* Mark the variable as used so that we do not get warnings
463 about it being unused later. */
464 TREE_USED (decl
) = 1;
468 return error_mark_node
;
471 /* Like unqualified_name_lookup_error, but NAME is an unqualified-id
472 used as a function. Returns an appropriate expression for
476 unqualified_fn_lookup_error (tree name
)
478 if (processing_template_decl
)
480 /* In a template, it is invalid to write "f()" or "f(3)" if no
481 declaration of "f" is available. Historically, G++ and most
482 other compilers accepted that usage since they deferred all name
483 lookup until instantiation time rather than doing unqualified
484 name lookup at template definition time; explain to the user what
487 Note that we have the exact wording of the following message in
488 the manual (trouble.texi, node "Name lookup"), so they need to
490 permerror (input_location
, "there are no arguments to %qD that depend on a template "
491 "parameter, so a declaration of %qD must be available",
494 if (!flag_permissive
)
499 inform (input_location
, "(if you use %<-fpermissive%>, G++ will accept your "
500 "code, but allowing the use of an undeclared name is "
508 return unqualified_name_lookup_error (name
);
511 /* Wrapper around build_lang_decl_loc(). Should gradually move to
512 build_lang_decl_loc() and then rename build_lang_decl_loc() back to
513 build_lang_decl(). */
516 build_lang_decl (enum tree_code code
, tree name
, tree type
)
518 return build_lang_decl_loc (input_location
, code
, name
, type
);
521 /* Build a decl from CODE, NAME, TYPE declared at LOC, and then add
522 DECL_LANG_SPECIFIC info to the result. */
525 build_lang_decl_loc (location_t loc
, enum tree_code code
, tree name
, tree type
)
529 t
= build_decl (loc
, code
, name
, type
);
530 retrofit_lang_decl (t
);
535 /* Add DECL_LANG_SPECIFIC info to T. Called from build_lang_decl
536 and pushdecl (for functions generated by the back end). */
539 retrofit_lang_decl (tree t
)
541 struct lang_decl
*ld
;
545 if (TREE_CODE (t
) == FUNCTION_DECL
)
546 sel
= 1, size
= sizeof (struct lang_decl_fn
);
547 else if (TREE_CODE (t
) == NAMESPACE_DECL
)
548 sel
= 2, size
= sizeof (struct lang_decl_ns
);
549 else if (TREE_CODE (t
) == PARM_DECL
)
550 sel
= 3, size
= sizeof (struct lang_decl_parm
);
551 else if (LANG_DECL_HAS_MIN (t
))
552 sel
= 0, size
= sizeof (struct lang_decl_min
);
556 ld
= ggc_alloc_cleared_lang_decl (size
);
558 ld
->u
.base
.selector
= sel
;
560 DECL_LANG_SPECIFIC (t
) = ld
;
561 if (current_lang_name
== lang_name_cplusplus
562 || decl_linkage (t
) == lk_none
)
563 SET_DECL_LANGUAGE (t
, lang_cplusplus
);
564 else if (current_lang_name
== lang_name_c
)
565 SET_DECL_LANGUAGE (t
, lang_c
);
566 else if (current_lang_name
== lang_name_java
)
567 SET_DECL_LANGUAGE (t
, lang_java
);
571 #ifdef GATHER_STATISTICS
572 tree_node_counts
[(int)lang_decl
] += 1;
573 tree_node_sizes
[(int)lang_decl
] += size
;
578 cxx_dup_lang_specific_decl (tree node
)
581 struct lang_decl
*ld
;
583 if (! DECL_LANG_SPECIFIC (node
))
586 if (TREE_CODE (node
) == FUNCTION_DECL
)
587 size
= sizeof (struct lang_decl_fn
);
588 else if (TREE_CODE (node
) == NAMESPACE_DECL
)
589 size
= sizeof (struct lang_decl_ns
);
590 else if (TREE_CODE (node
) == PARM_DECL
)
591 size
= sizeof (struct lang_decl_parm
);
592 else if (LANG_DECL_HAS_MIN (node
))
593 size
= sizeof (struct lang_decl_min
);
597 ld
= ggc_alloc_lang_decl (size
);
598 memcpy (ld
, DECL_LANG_SPECIFIC (node
), size
);
599 DECL_LANG_SPECIFIC (node
) = ld
;
601 #ifdef GATHER_STATISTICS
602 tree_node_counts
[(int)lang_decl
] += 1;
603 tree_node_sizes
[(int)lang_decl
] += size
;
607 /* Copy DECL, including any language-specific parts. */
610 copy_decl (tree decl
)
614 copy
= copy_node (decl
);
615 cxx_dup_lang_specific_decl (copy
);
619 /* Replace the shared language-specific parts of NODE with a new copy. */
622 copy_lang_type (tree node
)
625 struct lang_type
*lt
;
627 if (! TYPE_LANG_SPECIFIC (node
))
630 if (TYPE_LANG_SPECIFIC (node
)->u
.h
.is_lang_type_class
)
631 size
= sizeof (struct lang_type
);
633 size
= sizeof (struct lang_type_ptrmem
);
634 lt
= ggc_alloc_lang_type (size
);
635 memcpy (lt
, TYPE_LANG_SPECIFIC (node
), size
);
636 TYPE_LANG_SPECIFIC (node
) = lt
;
638 #ifdef GATHER_STATISTICS
639 tree_node_counts
[(int)lang_type
] += 1;
640 tree_node_sizes
[(int)lang_type
] += size
;
644 /* Copy TYPE, including any language-specific parts. */
647 copy_type (tree type
)
651 copy
= copy_node (type
);
652 copy_lang_type (copy
);
657 cxx_make_type (enum tree_code code
)
659 tree t
= make_node (code
);
661 /* Create lang_type structure. */
662 if (RECORD_OR_UNION_CODE_P (code
)
663 || code
== BOUND_TEMPLATE_TEMPLATE_PARM
)
666 = ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
668 TYPE_LANG_SPECIFIC (t
) = pi
;
669 pi
->u
.c
.h
.is_lang_type_class
= 1;
671 #ifdef GATHER_STATISTICS
672 tree_node_counts
[(int)lang_type
] += 1;
673 tree_node_sizes
[(int)lang_type
] += sizeof (struct lang_type
);
677 /* Set up some flags that give proper default behavior. */
678 if (RECORD_OR_UNION_CODE_P (code
))
680 struct c_fileinfo
*finfo
= get_fileinfo (input_filename
);
681 SET_CLASSTYPE_INTERFACE_UNKNOWN_X (t
, finfo
->interface_unknown
);
682 CLASSTYPE_INTERFACE_ONLY (t
) = finfo
->interface_only
;
689 make_class_type (enum tree_code code
)
691 tree t
= cxx_make_type (code
);
692 SET_CLASS_TYPE_P (t
, 1);
696 /* Returns true if we are currently in the main source file, or in a
697 template instantiation started from the main source file. */
700 in_main_input_context (void)
702 struct tinst_level
*tl
= outermost_tinst_level();
705 return strcmp (main_input_filename
,
706 LOCATION_FILE (tl
->locus
)) == 0;
708 return strcmp (main_input_filename
, input_filename
) == 0;