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freebsd-skq/contrib/gcclibs/libcpp/internal.h
ed 753612fc80 Add support for __COUNTER__. 
__COUNTER__ allows one to obtain incrementing (read: unique) numbers
from the C preprocesor. This is useful when implementing things like a
robust implementation of CTASSERT(), which currently fails when using
it more than once on a single line of code. Probably not likely to cause
any breakage, but still.

__COUNTER__ was also added to GCC 4.3, but since that implementation is
GPLv3 licensed, I took the liberty of implementing it without looking at
any upstream sources. Therefore, this version is licensed under the same
license as the rest of the code; GPLv2.
2011-12-13 17:34:47 +00:00

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/* Part of CPP library.
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* This header defines all the internal data structures and functions
that need to be visible across files. It should not be used outside
cpplib. */
#ifndef LIBCPP_INTERNAL_H
#define LIBCPP_INTERNAL_H
#include "symtab.h"
#include "cpp-id-data.h"
#ifndef HAVE_ICONV_H
#undef HAVE_ICONV
#endif
#if HAVE_ICONV
#include <iconv.h>
#else
#define HAVE_ICONV 0
typedef int iconv_t; /* dummy */
#endif
struct directive; /* Deliberately incomplete. */
struct pending_option;
struct op;
struct _cpp_strbuf;
typedef bool (*convert_f) (iconv_t, const unsigned char *, size_t,
struct _cpp_strbuf *);
struct cset_converter
{
convert_f func;
iconv_t cd;
};
#define BITS_PER_CPPCHAR_T (CHAR_BIT * sizeof (cppchar_t))
/* Test if a sign is valid within a preprocessing number. */
#define VALID_SIGN(c, prevc) \
(((c) == '+' || (c) == '-') && \
((prevc) == 'e' || (prevc) == 'E' \
|| (((prevc) == 'p' || (prevc) == 'P') \
&& CPP_OPTION (pfile, extended_numbers))))
#define CPP_OPTION(PFILE, OPTION) ((PFILE)->opts.OPTION)
#define CPP_BUFFER(PFILE) ((PFILE)->buffer)
#define CPP_BUF_COLUMN(BUF, CUR) ((CUR) - (BUF)->line_base)
#define CPP_BUF_COL(BUF) CPP_BUF_COLUMN(BUF, (BUF)->cur)
#define CPP_INCREMENT_LINE(PFILE, COLS_HINT) do { \
const struct line_maps *line_table = PFILE->line_table; \
const struct line_map *map = &line_table->maps[line_table->used-1]; \
unsigned int line = SOURCE_LINE (map, line_table->highest_line); \
linemap_line_start (PFILE->line_table, line + 1, COLS_HINT); \
} while (0)
/* Maximum nesting of cpp_buffers. We use a static limit, partly for
efficiency, and partly to limit runaway recursion. */
#define CPP_STACK_MAX 200
/* Host alignment handling. */
struct dummy
{
char c;
union
{
double d;
int *p;
} u;
};
#define DEFAULT_ALIGNMENT offsetof (struct dummy, u)
#define CPP_ALIGN2(size, align) (((size) + ((align) - 1)) & ~((align) - 1))
#define CPP_ALIGN(size) CPP_ALIGN2 (size, DEFAULT_ALIGNMENT)
#define _cpp_mark_macro_used(NODE) do { \
if ((NODE)->type == NT_MACRO && !((NODE)->flags & NODE_BUILTIN)) \
(NODE)->value.macro->used = 1; } while (0)
/* A generic memory buffer, and operations on it. */
typedef struct _cpp_buff _cpp_buff;
struct _cpp_buff
{
struct _cpp_buff *next;
unsigned char *base, *cur, *limit;
};
extern _cpp_buff *_cpp_get_buff (cpp_reader *, size_t);
extern void _cpp_release_buff (cpp_reader *, _cpp_buff *);
extern void _cpp_extend_buff (cpp_reader *, _cpp_buff **, size_t);
extern _cpp_buff *_cpp_append_extend_buff (cpp_reader *, _cpp_buff *, size_t);
extern void _cpp_free_buff (_cpp_buff *);
extern unsigned char *_cpp_aligned_alloc (cpp_reader *, size_t);
extern unsigned char *_cpp_unaligned_alloc (cpp_reader *, size_t);
#define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur)
#define BUFF_FRONT(BUFF) ((BUFF)->cur)
#define BUFF_LIMIT(BUFF) ((BUFF)->limit)
/* #include types. */
enum include_type {IT_INCLUDE, IT_INCLUDE_NEXT, IT_IMPORT, IT_CMDLINE};
union utoken
{
const cpp_token *token;
const cpp_token **ptoken;
};
/* A "run" of tokens; part of a chain of runs. */
typedef struct tokenrun tokenrun;
struct tokenrun
{
tokenrun *next, *prev;
cpp_token *base, *limit;
};
/* Accessor macros for struct cpp_context. */
#define FIRST(c) ((c)->u.iso.first)
#define LAST(c) ((c)->u.iso.last)
#define CUR(c) ((c)->u.trad.cur)
#define RLIMIT(c) ((c)->u.trad.rlimit)
typedef struct cpp_context cpp_context;
struct cpp_context
{
/* Doubly-linked list. */
cpp_context *next, *prev;
union
{
/* For ISO macro expansion. Contexts other than the base context
are contiguous tokens. e.g. macro expansions, expanded
argument tokens. */
struct
{
union utoken first;
union utoken last;
} iso;
/* For traditional macro expansion. */
struct
{
const unsigned char *cur;
const unsigned char *rlimit;
} trad;
} u;
/* If non-NULL, a buffer used for storage related to this context.
When the context is popped, the buffer is released. */
_cpp_buff *buff;
/* For a macro context, the macro node, otherwise NULL. */
cpp_hashnode *macro;
/* True if utoken element is token, else ptoken. */
bool direct_p;
};
struct lexer_state
{
/* Nonzero if first token on line is CPP_HASH. */
unsigned char in_directive;
/* Nonzero if in a directive that will handle padding tokens itself.
#include needs this to avoid problems with computed include and
spacing between tokens. */
unsigned char directive_wants_padding;
/* True if we are skipping a failed conditional group. */
unsigned char skipping;
/* Nonzero if in a directive that takes angle-bracketed headers. */
unsigned char angled_headers;
/* Nonzero if in a #if or #elif directive. */
unsigned char in_expression;
/* Nonzero to save comments. Turned off if discard_comments, and in
all directives apart from #define. */
unsigned char save_comments;
/* Nonzero if lexing __VA_ARGS__ is valid. */
unsigned char va_args_ok;
/* Nonzero if lexing poisoned identifiers is valid. */
unsigned char poisoned_ok;
/* Nonzero to prevent macro expansion. */
unsigned char prevent_expansion;
/* Nonzero when parsing arguments to a function-like macro. */
unsigned char parsing_args;
/* Nonzero if prevent_expansion is true only because output is
being discarded. */
unsigned char discarding_output;
/* Nonzero to skip evaluating part of an expression. */
unsigned int skip_eval;
/* Nonzero when handling a deferred pragma. */
unsigned char in_deferred_pragma;
/* Nonzero if the deferred pragma being handled allows macro expansion. */
unsigned char pragma_allow_expansion;
};
/* Special nodes - identifiers with predefined significance. */
struct spec_nodes
{
cpp_hashnode *n_defined; /* defined operator */
cpp_hashnode *n_true; /* C++ keyword true */
cpp_hashnode *n_false; /* C++ keyword false */
cpp_hashnode *n__VA_ARGS__; /* C99 vararg macros */
};
typedef struct _cpp_line_note _cpp_line_note;
struct _cpp_line_note
{
/* Location in the clean line the note refers to. */
const unsigned char *pos;
/* Type of note. The 9 'from' trigraph characters represent those
trigraphs, '\\' an escaped newline, ' ' an escaped newline with
intervening space, and anything else is invalid. */
unsigned int type;
};
/* Represents the contents of a file cpplib has read in. */
struct cpp_buffer
{
const unsigned char *cur; /* Current location. */
const unsigned char *line_base; /* Start of current physical line. */
const unsigned char *next_line; /* Start of to-be-cleaned logical line. */
const unsigned char *buf; /* Entire character buffer. */
const unsigned char *rlimit; /* Writable byte at end of file. */
_cpp_line_note *notes; /* Array of notes. */
unsigned int cur_note; /* Next note to process. */
unsigned int notes_used; /* Number of notes. */
unsigned int notes_cap; /* Size of allocated array. */
struct cpp_buffer *prev;
/* Pointer into the file table; non-NULL if this is a file buffer.
Used for include_next and to record control macros. */
struct _cpp_file *file;
/* Saved value of __TIMESTAMP__ macro - date and time of last modification
of the assotiated file. */
const unsigned char *timestamp;
/* Value of if_stack at start of this file.
Used to prohibit unmatched #endif (etc) in an include file. */
struct if_stack *if_stack;
/* True if we need to get the next clean line. */
bool need_line;
/* True if we have already warned about C++ comments in this file.
The warning happens only for C89 extended mode with -pedantic on,
or for -Wtraditional, and only once per file (otherwise it would
be far too noisy). */
unsigned int warned_cplusplus_comments : 1;
/* True if we don't process trigraphs and escaped newlines. True
for preprocessed input, command line directives, and _Pragma
buffers. */
unsigned int from_stage3 : 1;
/* At EOF, a buffer is automatically popped. If RETURN_AT_EOF is
true, a CPP_EOF token is then returned. Otherwise, the next
token from the enclosing buffer is returned. */
unsigned int return_at_eof : 1;
/* One for a system header, two for a C system header file that therefore
needs to be extern "C" protected in C++, and zero otherwise. */
unsigned char sysp;
/* The directory of the this buffer's file. Its NAME member is not
allocated, so we don't need to worry about freeing it. */
struct cpp_dir dir;
/* Descriptor for converting from the input character set to the
source character set. */
struct cset_converter input_cset_desc;
};
/* A cpp_reader encapsulates the "state" of a pre-processor run.
Applying cpp_get_token repeatedly yields a stream of pre-processor
tokens. Usually, there is only one cpp_reader object active. */
struct cpp_reader
{
/* Top of buffer stack. */
cpp_buffer *buffer;
/* Overlaid buffer (can be different after processing #include). */
cpp_buffer *overlaid_buffer;
/* Lexer state. */
struct lexer_state state;
/* Source line tracking. */
struct line_maps *line_table;
/* The line of the '#' of the current directive. */
source_location directive_line;
/* Memory buffers. */
_cpp_buff *a_buff; /* Aligned permanent storage. */
_cpp_buff *u_buff; /* Unaligned permanent storage. */
_cpp_buff *free_buffs; /* Free buffer chain. */
/* Context stack. */
struct cpp_context base_context;
struct cpp_context *context;
/* If in_directive, the directive if known. */
const struct directive *directive;
/* Token generated while handling a directive, if any. */
cpp_token directive_result;
/* Search paths for include files. */
struct cpp_dir *quote_include; /* "" */
struct cpp_dir *bracket_include; /* <> */
struct cpp_dir no_search_path; /* No path. */
/* Chain of all hashed _cpp_file instances. */
struct _cpp_file *all_files;
struct _cpp_file *main_file;
/* File and directory hash table. */
struct htab *file_hash;
struct htab *dir_hash;
struct file_hash_entry *file_hash_entries;
unsigned int file_hash_entries_allocated, file_hash_entries_used;
/* Nonzero means don't look for #include "foo" the source-file
directory. */
bool quote_ignores_source_dir;
/* Nonzero if any file has contained #pragma once or #import has
been used. */
bool seen_once_only;
/* Multiple include optimization. */
const cpp_hashnode *mi_cmacro;
const cpp_hashnode *mi_ind_cmacro;
bool mi_valid;
/* Lexing. */
cpp_token *cur_token;
tokenrun base_run, *cur_run;
unsigned int lookaheads;
/* Nonzero prevents the lexer from re-using the token runs. */
unsigned int keep_tokens;
/* Error counter for exit code. */
unsigned int errors;
/* Buffer to hold macro definition string. */
unsigned char *macro_buffer;
unsigned int macro_buffer_len;
/* Descriptor for converting from the source character set to the
execution character set. */
struct cset_converter narrow_cset_desc;
/* Descriptor for converting from the source character set to the
wide execution character set. */
struct cset_converter wide_cset_desc;
/* Date and time text. Calculated together if either is requested. */
const unsigned char *date;
const unsigned char *time;
/* EOF token, and a token forcing paste avoidance. */
cpp_token avoid_paste;
cpp_token eof;
/* Opaque handle to the dependencies of mkdeps.c. */
struct deps *deps;
/* Obstack holding all macro hash nodes. This never shrinks.
See identifiers.c */
struct obstack hash_ob;
/* Obstack holding buffer and conditional structures. This is a
real stack. See directives.c. */
struct obstack buffer_ob;
/* Pragma table - dynamic, because a library user can add to the
list of recognized pragmas. */
struct pragma_entry *pragmas;
/* Call backs to cpplib client. */
struct cpp_callbacks cb;
/* Identifier hash table. */
struct ht *hash_table;
/* Expression parser stack. */
struct op *op_stack, *op_limit;
/* User visible options. */
struct cpp_options opts;
/* Special nodes - identifiers with predefined significance to the
preprocessor. */
struct spec_nodes spec_nodes;
/* Whether cpplib owns the hashtable. */
bool our_hashtable;
/* Traditional preprocessing output buffer (a logical line). */
struct
{
unsigned char *base;
unsigned char *limit;
unsigned char *cur;
source_location first_line;
} out;
/* Used for buffer overlays by traditional.c. */
const unsigned char *saved_cur, *saved_rlimit, *saved_line_base;
/* A saved list of the defined macros, for dependency checking
of precompiled headers. */
struct cpp_savedstate *savedstate;
unsigned int nextcounter;
};
/* Character classes. Based on the more primitive macros in safe-ctype.h.
If the definition of `numchar' looks odd to you, please look up the
definition of a pp-number in the C standard [section 6.4.8 of C99].
In the unlikely event that characters other than \r and \n enter
the set is_vspace, the macro handle_newline() in lex.c must be
updated. */
#define _dollar_ok(x) ((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))
#define is_idchar(x) (ISIDNUM(x) || _dollar_ok(x))
#define is_numchar(x) ISIDNUM(x)
#define is_idstart(x) (ISIDST(x) || _dollar_ok(x))
#define is_numstart(x) ISDIGIT(x)
#define is_hspace(x) ISBLANK(x)
#define is_vspace(x) IS_VSPACE(x)
#define is_nvspace(x) IS_NVSPACE(x)
#define is_space(x) IS_SPACE_OR_NUL(x)
/* This table is constant if it can be initialized at compile time,
which is the case if cpp was compiled with GCC >=2.7, or another
compiler that supports C99. */
#if HAVE_DESIGNATED_INITIALIZERS
extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
#else
extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
#endif
/* Macros. */
static inline int cpp_in_system_header (cpp_reader *);
static inline int
cpp_in_system_header (cpp_reader *pfile)
{
return pfile->buffer ? pfile->buffer->sysp : 0;
}
#define CPP_PEDANTIC(PF) CPP_OPTION (PF, pedantic)
#define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, warn_traditional)
/* In errors.c */
extern int _cpp_begin_message (cpp_reader *, int,
source_location, unsigned int);
/* In macro.c */
extern void _cpp_free_definition (cpp_hashnode *);
extern bool _cpp_create_definition (cpp_reader *, cpp_hashnode *);
extern void _cpp_pop_context (cpp_reader *);
extern void _cpp_push_text_context (cpp_reader *, cpp_hashnode *,
const unsigned char *, size_t);
extern bool _cpp_save_parameter (cpp_reader *, cpp_macro *, cpp_hashnode *);
extern bool _cpp_arguments_ok (cpp_reader *, cpp_macro *, const cpp_hashnode *,
unsigned int);
extern const unsigned char *_cpp_builtin_macro_text (cpp_reader *,
cpp_hashnode *);
extern int _cpp_warn_if_unused_macro (cpp_reader *, cpp_hashnode *, void *);
extern void _cpp_push_token_context (cpp_reader *, cpp_hashnode *,
const cpp_token *, unsigned int);
/* In identifiers.c */
extern void _cpp_init_hashtable (cpp_reader *, hash_table *);
extern void _cpp_destroy_hashtable (cpp_reader *);
/* In files.c */
typedef struct _cpp_file _cpp_file;
extern _cpp_file *_cpp_find_file (cpp_reader *, const char *, cpp_dir *,
bool, int);
extern bool _cpp_find_failed (_cpp_file *);
extern void _cpp_mark_file_once_only (cpp_reader *, struct _cpp_file *);
extern void _cpp_fake_include (cpp_reader *, const char *);
extern bool _cpp_stack_file (cpp_reader *, _cpp_file*, bool);
extern bool _cpp_stack_include (cpp_reader *, const char *, int,
enum include_type);
extern int _cpp_compare_file_date (cpp_reader *, const char *, int);
extern void _cpp_report_missing_guards (cpp_reader *);
extern void _cpp_init_files (cpp_reader *);
extern void _cpp_cleanup_files (cpp_reader *);
extern void _cpp_pop_file_buffer (cpp_reader *, struct _cpp_file *);
extern bool _cpp_save_file_entries (cpp_reader *pfile, FILE *f);
extern bool _cpp_read_file_entries (cpp_reader *, FILE *);
extern struct stat *_cpp_get_file_stat (_cpp_file *);
/* In expr.c */
extern bool _cpp_parse_expr (cpp_reader *);
extern struct op *_cpp_expand_op_stack (cpp_reader *);
/* In lex.c */
extern void _cpp_process_line_notes (cpp_reader *, int);
extern void _cpp_clean_line (cpp_reader *);
extern bool _cpp_get_fresh_line (cpp_reader *);
extern bool _cpp_skip_block_comment (cpp_reader *);
extern cpp_token *_cpp_temp_token (cpp_reader *);
extern const cpp_token *_cpp_lex_token (cpp_reader *);
extern cpp_token *_cpp_lex_direct (cpp_reader *);
extern int _cpp_equiv_tokens (const cpp_token *, const cpp_token *);
extern void _cpp_init_tokenrun (tokenrun *, unsigned int);
/* In init.c. */
extern void _cpp_maybe_push_include_file (cpp_reader *);
/* In directives.c */
extern int _cpp_test_assertion (cpp_reader *, unsigned int *);
extern int _cpp_handle_directive (cpp_reader *, int);
extern void _cpp_define_builtin (cpp_reader *, const char *);
extern char ** _cpp_save_pragma_names (cpp_reader *);
extern void _cpp_restore_pragma_names (cpp_reader *, char **);
extern void _cpp_do__Pragma (cpp_reader *);
extern void _cpp_init_directives (cpp_reader *);
extern void _cpp_init_internal_pragmas (cpp_reader *);
extern void _cpp_do_file_change (cpp_reader *, enum lc_reason, const char *,
unsigned int, unsigned int);
extern void _cpp_pop_buffer (cpp_reader *);
/* In traditional.c. */
extern bool _cpp_scan_out_logical_line (cpp_reader *, cpp_macro *);
extern bool _cpp_read_logical_line_trad (cpp_reader *);
extern void _cpp_overlay_buffer (cpp_reader *pfile, const unsigned char *,
size_t);
extern void _cpp_remove_overlay (cpp_reader *);
extern bool _cpp_create_trad_definition (cpp_reader *, cpp_macro *);
extern bool _cpp_expansions_different_trad (const cpp_macro *,
const cpp_macro *);
extern unsigned char *_cpp_copy_replacement_text (const cpp_macro *,
unsigned char *);
extern size_t _cpp_replacement_text_len (const cpp_macro *);
/* In charset.c. */
/* The normalization state at this point in the sequence.
It starts initialized to all zeros, and at the end
'level' is the normalization level of the sequence. */
struct normalize_state
{
/* The previous character. */
cppchar_t previous;
/* The combining class of the previous character. */
unsigned char prev_class;
/* The lowest normalization level so far. */
enum cpp_normalize_level level;
};
#define INITIAL_NORMALIZE_STATE { 0, 0, normalized_KC }
#define NORMALIZE_STATE_RESULT(st) ((st)->level)
/* We saw a character that matches ISIDNUM(), update a
normalize_state appropriately. */
#define NORMALIZE_STATE_UPDATE_IDNUM(st) \
((st)->previous = 0, (st)->prev_class = 0)
extern cppchar_t _cpp_valid_ucn (cpp_reader *, const unsigned char **,
const unsigned char *, int,
struct normalize_state *state);
extern void _cpp_destroy_iconv (cpp_reader *);
extern unsigned char *_cpp_convert_input (cpp_reader *, const char *,
unsigned char *, size_t, size_t,
off_t *);
extern const char *_cpp_default_encoding (void);
extern cpp_hashnode * _cpp_interpret_identifier (cpp_reader *pfile,
const unsigned char *id,
size_t len);
/* Utility routines and macros. */
#define DSC(str) (const unsigned char *)str, sizeof str - 1
/* These are inline functions instead of macros so we can get type
checking. */
static inline int ustrcmp (const unsigned char *, const unsigned char *);
static inline int ustrncmp (const unsigned char *, const unsigned char *,
size_t);
static inline size_t ustrlen (const unsigned char *);
static inline unsigned char *uxstrdup (const unsigned char *);
static inline unsigned char *ustrchr (const unsigned char *, int);
static inline int ufputs (const unsigned char *, FILE *);
/* Use a const char for the second parameter since it is usually a literal. */
static inline int ustrcspn (const unsigned char *, const char *);
static inline int
ustrcmp (const unsigned char *s1, const unsigned char *s2)
{
return strcmp ((const char *)s1, (const char *)s2);
}
static inline int
ustrncmp (const unsigned char *s1, const unsigned char *s2, size_t n)
{
return strncmp ((const char *)s1, (const char *)s2, n);
}
static inline int
ustrcspn (const unsigned char *s1, const char *s2)
{
return strcspn ((const char *)s1, s2);
}
static inline size_t
ustrlen (const unsigned char *s1)
{
return strlen ((const char *)s1);
}
static inline unsigned char *
uxstrdup (const unsigned char *s1)
{
return (unsigned char *) xstrdup ((const char *)s1);
}
static inline unsigned char *
ustrchr (const unsigned char *s1, int c)
{
return (unsigned char *) strchr ((const char *)s1, c);
}
static inline int
ufputs (const unsigned char *s, FILE *f)
{
return fputs ((const char *)s, f);
}
#endif /* ! LIBCPP_INTERNAL_H */
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