1 /* Separate lexical analyzer for GNU C++.
2 Copyright (C) 1987-2015 Free Software Foundation, Inc.
3 Hacked by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* This file is the lexical analyzer for GNU C++. */
26 #include "coretypes.h"
32 #include "double-int.h"
39 #include "stringpool.h"
43 #include "c-family/c-pragma.h"
44 #include "c-family/c-objc.h"
48 static int interface_strcmp (const char *);
49 static void init_cp_pragma (void);
51 static tree
parse_strconst_pragma (const char *, int);
52 static void handle_pragma_vtable (cpp_reader
*);
53 static void handle_pragma_unit (cpp_reader
*);
54 static void handle_pragma_interface (cpp_reader
*);
55 static void handle_pragma_implementation (cpp_reader
*);
56 static void handle_pragma_java_exceptions (cpp_reader
*);
58 static void init_operators (void);
59 static void copy_lang_type (tree
);
61 /* A constraint that can be tested at compile time. */
62 #define CONSTRAINT(name, expr) extern int constraint_##name [(expr) ? 1 : -1]
64 /* Functions and data structures for #pragma interface.
66 `#pragma implementation' means that the main file being compiled
67 is considered to implement (provide) the classes that appear in
68 its main body. I.e., if this is file "foo.cc", and class `bar'
69 is defined in "foo.cc", then we say that "foo.cc implements bar".
71 All main input files "implement" themselves automagically.
73 `#pragma interface' means that unless this file (of the form "foo.h"
74 is not presently being included by file "foo.cc", the
75 CLASSTYPE_INTERFACE_ONLY bit gets set. The effect is that none
76 of the vtables nor any of the inline functions defined in foo.h
79 There are cases when we want to link files such as "defs.h" and
80 "main.cc". In this case, we give "defs.h" a `#pragma interface',
81 and "main.cc" has `#pragma implementation "defs.h"'. */
86 struct impl_files
*next
;
89 static struct impl_files
*impl_file_chain
;
91 /* True if we saw "#pragma GCC java_exceptions". */
92 bool pragma_java_exceptions
;
100 /* A mapping from tree codes to operator name information. */
101 operator_name_info_t operator_name_info
[(int) MAX_TREE_CODES
];
102 /* Similar, but for assignment operators. */
103 operator_name_info_t assignment_operator_name_info
[(int) MAX_TREE_CODES
];
105 /* Initialize data structures that keep track of operator names. */
107 #define DEF_OPERATOR(NAME, C, M, AR, AP) \
108 CONSTRAINT (C, sizeof "operator " + sizeof NAME <= 256);
109 #include "operators.def"
113 init_operators (void)
117 struct operator_name_info_t
*oni
;
119 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
120 sprintf (buffer, ISALPHA (NAME[0]) ? "operator %s" : "operator%s", NAME); \
121 identifier = get_identifier (buffer); \
122 IDENTIFIER_OPNAME_P (identifier) = 1; \
125 ? &assignment_operator_name_info[(int) CODE] \
126 : &operator_name_info[(int) CODE]); \
127 oni->identifier = identifier; \
129 oni->mangled_name = MANGLING; \
132 #include "operators.def"
135 operator_name_info
[(int) ERROR_MARK
].identifier
136 = get_identifier ("<invalid operator>");
138 /* Handle some special cases. These operators are not defined in
139 the language, but can be produced internally. We may need them
140 for error-reporting. (Eventually, we should ensure that this
141 does not happen. Error messages involving these operators will
142 be confusing to users.) */
144 operator_name_info
[(int) INIT_EXPR
].name
145 = operator_name_info
[(int) MODIFY_EXPR
].name
;
146 operator_name_info
[(int) EXACT_DIV_EXPR
].name
= "(ceiling /)";
147 operator_name_info
[(int) CEIL_DIV_EXPR
].name
= "(ceiling /)";
148 operator_name_info
[(int) FLOOR_DIV_EXPR
].name
= "(floor /)";
149 operator_name_info
[(int) ROUND_DIV_EXPR
].name
= "(round /)";
150 operator_name_info
[(int) CEIL_MOD_EXPR
].name
= "(ceiling %)";
151 operator_name_info
[(int) FLOOR_MOD_EXPR
].name
= "(floor %)";
152 operator_name_info
[(int) ROUND_MOD_EXPR
].name
= "(round %)";
153 operator_name_info
[(int) ABS_EXPR
].name
= "abs";
154 operator_name_info
[(int) TRUTH_AND_EXPR
].name
= "strict &&";
155 operator_name_info
[(int) TRUTH_OR_EXPR
].name
= "strict ||";
156 operator_name_info
[(int) RANGE_EXPR
].name
= "...";
157 operator_name_info
[(int) UNARY_PLUS_EXPR
].name
= "+";
159 assignment_operator_name_info
[(int) EXACT_DIV_EXPR
].name
161 assignment_operator_name_info
[(int) CEIL_DIV_EXPR
].name
163 assignment_operator_name_info
[(int) FLOOR_DIV_EXPR
].name
165 assignment_operator_name_info
[(int) ROUND_DIV_EXPR
].name
167 assignment_operator_name_info
[(int) CEIL_MOD_EXPR
].name
169 assignment_operator_name_info
[(int) FLOOR_MOD_EXPR
].name
171 assignment_operator_name_info
[(int) ROUND_MOD_EXPR
].name
175 /* Initialize the reserved words. */
184 if (cxx_dialect
< cxx11
)
187 mask
|= D_ASM
| D_EXT
;
188 if (flag_no_gnu_keywords
)
191 /* The Objective-C keywords are all context-dependent. */
194 ridpointers
= ggc_cleared_vec_alloc
<tree
> ((int) RID_MAX
);
195 for (i
= 0; i
< num_c_common_reswords
; i
++)
197 if (c_common_reswords
[i
].disable
& D_CONLY
)
199 id
= get_identifier (c_common_reswords
[i
].word
);
200 C_SET_RID_CODE (id
, c_common_reswords
[i
].rid
);
201 ridpointers
[(int) c_common_reswords
[i
].rid
] = id
;
202 if (! (c_common_reswords
[i
].disable
& mask
))
203 C_IS_RESERVED_WORD (id
) = 1;
206 for (i
= 0; i
< NUM_INT_N_ENTS
; i
++)
209 sprintf (name
, "__int%d", int_n_data
[i
].bitsize
);
210 id
= get_identifier (name
);
211 C_SET_RID_CODE (id
, RID_FIRST_INT_N
+ i
);
212 C_IS_RESERVED_WORD (id
) = 1;
217 init_cp_pragma (void)
219 c_register_pragma (0, "vtable", handle_pragma_vtable
);
220 c_register_pragma (0, "unit", handle_pragma_unit
);
221 c_register_pragma (0, "interface", handle_pragma_interface
);
222 c_register_pragma (0, "implementation", handle_pragma_implementation
);
223 c_register_pragma ("GCC", "interface", handle_pragma_interface
);
224 c_register_pragma ("GCC", "implementation", handle_pragma_implementation
);
225 c_register_pragma ("GCC", "java_exceptions", handle_pragma_java_exceptions
);
228 /* TRUE if a code represents a statement. */
230 bool statement_code_p
[MAX_TREE_CODES
];
232 /* Initialize the C++ front end. This function is very sensitive to
233 the exact order that things are done here. It would be nice if the
234 initialization done by this routine were moved to its subroutines,
235 and the ordering dependencies clarified and reduced. */
239 location_t saved_loc
;
241 static const enum tree_code stmt_codes
[] = {
242 CTOR_INITIALIZER
, TRY_BLOCK
, HANDLER
,
243 EH_SPEC_BLOCK
, USING_STMT
, TAG_DEFN
,
244 IF_STMT
, CLEANUP_STMT
, FOR_STMT
,
245 RANGE_FOR_STMT
, WHILE_STMT
, DO_STMT
,
246 BREAK_STMT
, CONTINUE_STMT
, SWITCH_STMT
,
250 memset (&statement_code_p
, 0, sizeof (statement_code_p
));
251 for (i
= 0; i
< ARRAY_SIZE (stmt_codes
); i
++)
252 statement_code_p
[stmt_codes
[i
]] = true;
254 saved_loc
= input_location
;
255 input_location
= BUILTINS_LOCATION
;
259 init_cp_semantics ();
264 current_function_decl
= NULL
;
266 class_type_node
= ridpointers
[(int) RID_CLASS
];
268 cxx_init_decl_processing ();
270 if (c_common_init () == false)
272 input_location
= saved_loc
;
280 input_location
= saved_loc
;
284 /* Return nonzero if S is not considered part of an
285 INTERFACE/IMPLEMENTATION pair. Otherwise, return 0. */
288 interface_strcmp (const char* s
)
290 /* Set the interface/implementation bits for this scope. */
291 struct impl_files
*ifiles
;
294 for (ifiles
= impl_file_chain
; ifiles
; ifiles
= ifiles
->next
)
296 const char *t1
= ifiles
->filename
;
299 if (*s1
== 0 || filename_ncmp (s1
, t1
, 1) != 0)
302 while (*s1
!= 0 && filename_ncmp (s1
, t1
, 1) == 0)
309 /* Don't get faked out by xxx.yyy.cc vs xxx.zzz.cc. */
310 if (strchr (s1
, '.') || strchr (t1
, '.'))
313 if (*s1
== '\0' || s1
[-1] != '.' || t1
[-1] != '.')
326 /* Parse a #pragma whose sole argument is a string constant.
327 If OPT is true, the argument is optional. */
329 parse_strconst_pragma (const char* name
, int opt
)
334 t
= pragma_lex (&result
);
337 if (pragma_lex (&x
) != CPP_EOF
)
338 warning (0, "junk at end of #pragma %s", name
);
342 if (t
== CPP_EOF
&& opt
)
345 error ("invalid #pragma %s", name
);
346 return error_mark_node
;
350 handle_pragma_vtable (cpp_reader
* /*dfile*/)
352 parse_strconst_pragma ("vtable", 0);
353 sorry ("#pragma vtable no longer supported");
357 handle_pragma_unit (cpp_reader
* /*dfile*/)
359 /* Validate syntax, but don't do anything. */
360 parse_strconst_pragma ("unit", 0);
364 handle_pragma_interface (cpp_reader
* /*dfile*/)
366 tree fname
= parse_strconst_pragma ("interface", 1);
367 struct c_fileinfo
*finfo
;
368 const char *filename
;
370 if (fname
== error_mark_node
)
373 filename
= lbasename (LOCATION_FILE (input_location
));
375 filename
= TREE_STRING_POINTER (fname
);
377 finfo
= get_fileinfo (LOCATION_FILE (input_location
));
379 if (impl_file_chain
== 0)
381 /* If this is zero at this point, then we are
382 auto-implementing. */
383 if (main_input_filename
== 0)
384 main_input_filename
= LOCATION_FILE (input_location
);
387 finfo
->interface_only
= interface_strcmp (filename
);
388 /* If MULTIPLE_SYMBOL_SPACES is set, we cannot assume that we can see
389 a definition in another file. */
390 if (!MULTIPLE_SYMBOL_SPACES
|| !finfo
->interface_only
)
391 finfo
->interface_unknown
= 0;
394 /* Note that we have seen a #pragma implementation for the key MAIN_FILENAME.
395 We used to only allow this at toplevel, but that restriction was buggy
396 in older compilers and it seems reasonable to allow it in the headers
397 themselves, too. It only needs to precede the matching #p interface.
399 We don't touch finfo->interface_only or finfo->interface_unknown;
400 the user must specify a matching #p interface for this to have
404 handle_pragma_implementation (cpp_reader
* /*dfile*/)
406 tree fname
= parse_strconst_pragma ("implementation", 1);
407 const char *filename
;
408 struct impl_files
*ifiles
= impl_file_chain
;
410 if (fname
== error_mark_node
)
415 if (main_input_filename
)
416 filename
= main_input_filename
;
418 filename
= LOCATION_FILE (input_location
);
419 filename
= lbasename (filename
);
423 filename
= TREE_STRING_POINTER (fname
);
424 if (cpp_included_before (parse_in
, filename
, input_location
))
425 warning (0, "#pragma implementation for %qs appears after "
426 "file is included", filename
);
429 for (; ifiles
; ifiles
= ifiles
->next
)
431 if (! filename_cmp (ifiles
->filename
, filename
))
436 ifiles
= XNEW (struct impl_files
);
437 ifiles
->filename
= xstrdup (filename
);
438 ifiles
->next
= impl_file_chain
;
439 impl_file_chain
= ifiles
;
443 /* Indicate that this file uses Java-personality exception handling. */
445 handle_pragma_java_exceptions (cpp_reader
* /*dfile*/)
448 if (pragma_lex (&x
) != CPP_EOF
)
449 warning (0, "junk at end of #pragma GCC java_exceptions");
451 choose_personality_routine (lang_java
);
452 pragma_java_exceptions
= true;
455 /* Issue an error message indicating that the lookup of NAME (an
456 IDENTIFIER_NODE) failed. Returns the ERROR_MARK_NODE. */
459 unqualified_name_lookup_error (tree name
)
461 if (IDENTIFIER_OPNAME_P (name
))
463 if (name
!= ansi_opname (ERROR_MARK
))
464 error ("%qD not defined", name
);
468 if (!objc_diagnose_private_ivar (name
))
470 error ("%qD was not declared in this scope", name
);
471 suggest_alternatives_for (location_of (name
), name
);
473 /* Prevent repeated error messages by creating a VAR_DECL with
474 this NAME in the innermost block scope. */
475 if (local_bindings_p ())
478 decl
= build_decl (input_location
,
479 VAR_DECL
, name
, error_mark_node
);
480 DECL_CONTEXT (decl
) = current_function_decl
;
481 push_local_binding (name
, decl
, 0);
482 /* Mark the variable as used so that we do not get warnings
483 about it being unused later. */
484 TREE_USED (decl
) = 1;
488 return error_mark_node
;
491 /* Like unqualified_name_lookup_error, but NAME is an unqualified-id
492 used as a function. Returns an appropriate expression for
496 unqualified_fn_lookup_error (tree name
)
498 if (processing_template_decl
)
500 /* In a template, it is invalid to write "f()" or "f(3)" if no
501 declaration of "f" is available. Historically, G++ and most
502 other compilers accepted that usage since they deferred all name
503 lookup until instantiation time rather than doing unqualified
504 name lookup at template definition time; explain to the user what
507 Note that we have the exact wording of the following message in
508 the manual (trouble.texi, node "Name lookup"), so they need to
510 permerror (input_location
, "there are no arguments to %qD that depend on a template "
511 "parameter, so a declaration of %qD must be available",
514 if (!flag_permissive
)
519 inform (input_location
, "(if you use %<-fpermissive%>, G++ will accept your "
520 "code, but allowing the use of an undeclared name is "
528 return unqualified_name_lookup_error (name
);
531 /* Wrapper around build_lang_decl_loc(). Should gradually move to
532 build_lang_decl_loc() and then rename build_lang_decl_loc() back to
533 build_lang_decl(). */
536 build_lang_decl (enum tree_code code
, tree name
, tree type
)
538 return build_lang_decl_loc (input_location
, code
, name
, type
);
541 /* Build a decl from CODE, NAME, TYPE declared at LOC, and then add
542 DECL_LANG_SPECIFIC info to the result. */
545 build_lang_decl_loc (location_t loc
, enum tree_code code
, tree name
, tree type
)
549 t
= build_decl (loc
, code
, name
, type
);
550 retrofit_lang_decl (t
);
555 /* Add DECL_LANG_SPECIFIC info to T. Called from build_lang_decl
556 and pushdecl (for functions generated by the back end). */
559 retrofit_lang_decl (tree t
)
561 struct lang_decl
*ld
;
565 if (TREE_CODE (t
) == FUNCTION_DECL
)
566 sel
= 1, size
= sizeof (struct lang_decl_fn
);
567 else if (TREE_CODE (t
) == NAMESPACE_DECL
)
568 sel
= 2, size
= sizeof (struct lang_decl_ns
);
569 else if (TREE_CODE (t
) == PARM_DECL
)
570 sel
= 3, size
= sizeof (struct lang_decl_parm
);
571 else if (LANG_DECL_HAS_MIN (t
))
572 sel
= 0, size
= sizeof (struct lang_decl_min
);
576 ld
= (struct lang_decl
*) ggc_internal_cleared_alloc (size
);
578 ld
->u
.base
.selector
= sel
;
580 DECL_LANG_SPECIFIC (t
) = ld
;
581 if (current_lang_name
== lang_name_cplusplus
582 || decl_linkage (t
) == lk_none
)
583 SET_DECL_LANGUAGE (t
, lang_cplusplus
);
584 else if (current_lang_name
== lang_name_c
)
585 SET_DECL_LANGUAGE (t
, lang_c
);
586 else if (current_lang_name
== lang_name_java
)
587 SET_DECL_LANGUAGE (t
, lang_java
);
591 if (GATHER_STATISTICS
)
593 tree_node_counts
[(int)lang_decl
] += 1;
594 tree_node_sizes
[(int)lang_decl
] += size
;
599 cxx_dup_lang_specific_decl (tree node
)
602 struct lang_decl
*ld
;
604 if (! DECL_LANG_SPECIFIC (node
))
607 if (TREE_CODE (node
) == FUNCTION_DECL
)
608 size
= sizeof (struct lang_decl_fn
);
609 else if (TREE_CODE (node
) == NAMESPACE_DECL
)
610 size
= sizeof (struct lang_decl_ns
);
611 else if (TREE_CODE (node
) == PARM_DECL
)
612 size
= sizeof (struct lang_decl_parm
);
613 else if (LANG_DECL_HAS_MIN (node
))
614 size
= sizeof (struct lang_decl_min
);
618 ld
= (struct lang_decl
*) ggc_internal_alloc (size
);
619 memcpy (ld
, DECL_LANG_SPECIFIC (node
), size
);
620 DECL_LANG_SPECIFIC (node
) = ld
;
622 if (GATHER_STATISTICS
)
624 tree_node_counts
[(int)lang_decl
] += 1;
625 tree_node_sizes
[(int)lang_decl
] += size
;
629 /* Copy DECL, including any language-specific parts. */
632 copy_decl (tree decl
)
636 copy
= copy_node (decl
);
637 cxx_dup_lang_specific_decl (copy
);
641 /* Replace the shared language-specific parts of NODE with a new copy. */
644 copy_lang_type (tree node
)
647 struct lang_type
*lt
;
649 if (! TYPE_LANG_SPECIFIC (node
))
652 if (TYPE_LANG_SPECIFIC (node
)->u
.h
.is_lang_type_class
)
653 size
= sizeof (struct lang_type
);
655 size
= sizeof (struct lang_type_ptrmem
);
656 lt
= (struct lang_type
*) ggc_internal_alloc (size
);
657 memcpy (lt
, TYPE_LANG_SPECIFIC (node
), size
);
658 TYPE_LANG_SPECIFIC (node
) = lt
;
660 if (GATHER_STATISTICS
)
662 tree_node_counts
[(int)lang_type
] += 1;
663 tree_node_sizes
[(int)lang_type
] += size
;
667 /* Copy TYPE, including any language-specific parts. */
670 copy_type (tree type
)
674 copy
= copy_node (type
);
675 copy_lang_type (copy
);
680 cxx_make_type (enum tree_code code
)
682 tree t
= make_node (code
);
684 /* Create lang_type structure. */
685 if (RECORD_OR_UNION_CODE_P (code
)
686 || code
== BOUND_TEMPLATE_TEMPLATE_PARM
)
689 = (struct lang_type
*) ggc_internal_cleared_alloc
690 (sizeof (struct lang_type
));
692 TYPE_LANG_SPECIFIC (t
) = pi
;
693 pi
->u
.c
.h
.is_lang_type_class
= 1;
695 if (GATHER_STATISTICS
)
697 tree_node_counts
[(int)lang_type
] += 1;
698 tree_node_sizes
[(int)lang_type
] += sizeof (struct lang_type
);
702 /* Set up some flags that give proper default behavior. */
703 if (RECORD_OR_UNION_CODE_P (code
))
705 struct c_fileinfo
*finfo
= \
706 get_fileinfo (LOCATION_FILE (input_location
));
707 SET_CLASSTYPE_INTERFACE_UNKNOWN_X (t
, finfo
->interface_unknown
);
708 CLASSTYPE_INTERFACE_ONLY (t
) = finfo
->interface_only
;
715 make_class_type (enum tree_code code
)
717 tree t
= cxx_make_type (code
);
718 SET_CLASS_TYPE_P (t
, 1);
722 /* Returns true if we are currently in the main source file, or in a
723 template instantiation started from the main source file. */
726 in_main_input_context (void)
728 struct tinst_level
*tl
= outermost_tinst_level();
731 return filename_cmp (main_input_filename
,
732 LOCATION_FILE (tl
->locus
)) == 0;
734 return filename_cmp (main_input_filename
, LOCATION_FILE (input_location
)) == 0;