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/* Declarations for variables relating to reading the source file.
Used by parsers, lexical analyzers, and error message routines.
Copyright (C) 1993-2022 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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 3, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_INPUT_H
#define GCC_INPUT_H
#include "line-map.h"
extern GTY(()) class line_maps *line_table;
extern GTY(()) class line_maps *saved_line_table;
/* A value which will never be used to represent a real location. */
#define UNKNOWN_LOCATION ((location_t) 0)
/* The location for declarations in "<built-in>" */
#define BUILTINS_LOCATION ((location_t) 1)
/* line-map.cc reserves RESERVED_LOCATION_COUNT to the user. Ensure
both UNKNOWN_LOCATION and BUILTINS_LOCATION fit into that. */
STATIC_ASSERT (BUILTINS_LOCATION < RESERVED_LOCATION_COUNT);
/* Hasher for 'location_t' values satisfying '!RESERVED_LOCATION_P', thus able
to use 'UNKNOWN_LOCATION'/'BUILTINS_LOCATION' as spare values for
'Empty'/'Deleted'. */
/* Per PR103157 "'gengtype': 'typedef' causing infinite-recursion code to be
generated", don't use
typedef int_hash<location_t, UNKNOWN_LOCATION, BUILTINS_LOCATION>
location_hash;
here.
It works for a single-use case, but when using a 'struct'-based variant
struct location_hash
: int_hash<location_t, UNKNOWN_LOCATION, BUILTINS_LOCATION> {};
in more than one place, 'gengtype' generates duplicate functions (thus:
"error: redefinition of 'void gt_ggc_mx(location_hash&)'" etc.).
Attempting to mark that one up with GTY options, we run into a 'gengtype'
"parse error: expected '{', have '<'", which probably falls into category
"understanding of C++ is limited", as documented in 'gcc/doc/gty.texi'.
Thus, use a plain ol' '#define':
*/
#define location_hash int_hash<location_t, UNKNOWN_LOCATION, BUILTINS_LOCATION>
extern bool is_location_from_builtin_token (location_t);
extern expanded_location expand_location (location_t);
class cpp_char_column_policy;
extern int
location_compute_display_column (expanded_location exploc,
const cpp_char_column_policy &policy);
/* A class capturing the bounds of a buffer, to allow for run-time
bounds-checking in a checked build. */
class char_span
{
public:
char_span (const char *ptr, size_t n_elts) : m_ptr (ptr), m_n_elts (n_elts) {}
/* Test for a non-NULL pointer. */
operator bool() const { return m_ptr; }
/* Get length, not including any 0-terminator (which may not be,
in fact, present). */
size_t length () const { return m_n_elts; }
const char *get_buffer () const { return m_ptr; }
char operator[] (int idx) const
{
gcc_assert (idx >= 0);
gcc_assert ((size_t)idx < m_n_elts);
return m_ptr[idx];
}
char_span subspan (int offset, int n_elts) const
{
gcc_assert (offset >= 0);
gcc_assert (offset < (int)m_n_elts);
gcc_assert (n_elts >= 0);
gcc_assert (offset + n_elts <= (int)m_n_elts);
return char_span (m_ptr + offset, n_elts);
}
char *xstrdup () const
{
return ::xstrndup (m_ptr, m_n_elts);
}
private:
const char *m_ptr;
size_t m_n_elts;
};
extern char_span location_get_source_line (const char *file_path, int line);
extern bool location_missing_trailing_newline (const char *file_path);
/* Forward decl of slot within file_cache, so that the definition doesn't
need to be in this header. */
class file_cache_slot;
/* A cache of source files for use when emitting diagnostics
(and in a few places in the C/C++ frontends).
Results are only valid until the next call to the cache, as
slots can be evicted.
Filenames are stored by pointer, and so must outlive the cache
instance. */
class file_cache
{
public:
file_cache ();
~file_cache ();
file_cache_slot *lookup_or_add_file (const char *file_path);
void forcibly_evict_file (const char *file_path);
/* See comments in diagnostic.h about the input conversion context. */
struct input_context
{
diagnostic_input_charset_callback ccb;
bool should_skip_bom;
};
void initialize_input_context (diagnostic_input_charset_callback ccb,
bool should_skip_bom);
private:
file_cache_slot *evicted_cache_tab_entry (unsigned *highest_use_count);
file_cache_slot *add_file (const char *file_path);
file_cache_slot *lookup_file (const char *file_path);
private:
static const size_t num_file_slots = 16;
file_cache_slot *m_file_slots;
input_context in_context;
};
extern expanded_location
expand_location_to_spelling_point (location_t,
enum location_aspect aspect
= LOCATION_ASPECT_CARET);
extern location_t expansion_point_location_if_in_system_header (location_t);
extern location_t expansion_point_location (location_t);
extern location_t input_location;
#define LOCATION_FILE(LOC) ((expand_location (LOC)).file)
#define LOCATION_LINE(LOC) ((expand_location (LOC)).line)
#define LOCATION_COLUMN(LOC)((expand_location (LOC)).column)
#define LOCATION_LOCUS(LOC) \
((IS_ADHOC_LOC (LOC)) ? get_location_from_adhoc_loc (line_table, LOC) \
: (LOC))
#define LOCATION_BLOCK(LOC) \
((tree) ((IS_ADHOC_LOC (LOC)) ? get_data_from_adhoc_loc (line_table, (LOC)) \
: NULL))
#define RESERVED_LOCATION_P(LOC) \
(LOCATION_LOCUS (LOC) < RESERVED_LOCATION_COUNT)
/* Return a positive value if LOCATION is the locus of a token that is
located in a system header, O otherwise. It returns 1 if LOCATION
is the locus of a token that is located in a system header, and 2
if LOCATION is the locus of a token located in a C system header
that therefore needs to be extern "C" protected in C++.
Note that this function returns 1 if LOCATION belongs to a token
that is part of a macro replacement-list defined in a system
header, but expanded in a non-system file. */
static inline int
in_system_header_at (location_t loc)
{
return linemap_location_in_system_header_p (line_table, loc);
}
/* Return true if LOCATION is the locus of a token that
comes from a macro expansion, false otherwise. */
static inline bool
from_macro_expansion_at (location_t loc)
{
return linemap_location_from_macro_expansion_p (line_table, loc);
}
/* Return true if LOCATION is the locus of a token that comes from
a macro definition, false otherwise. This differs from from_macro_expansion_at
in its treatment of macro arguments, for which this returns false. */
static inline bool
from_macro_definition_at (location_t loc)
{
return linemap_location_from_macro_definition_p (line_table, loc);
}
static inline location_t
get_pure_location (location_t loc)
{
return get_pure_location (line_table, loc);
}
/* Get the start of any range encoded within location LOC. */
static inline location_t
get_start (location_t loc)
{
return get_range_from_loc (line_table, loc).m_start;
}
/* Get the endpoint of any range encoded within location LOC. */
static inline location_t
get_finish (location_t loc)
{
return get_range_from_loc (line_table, loc).m_finish;
}
extern location_t make_location (location_t caret,
location_t start, location_t finish);
extern location_t make_location (location_t caret, source_range src_range);
void dump_line_table_statistics (void);
void dump_location_info (FILE *stream);
void diagnostics_file_cache_fini (void);
void diagnostics_file_cache_forcibly_evict_file (const char *file_path);
class GTY(()) string_concat
{
public:
string_concat (int num, location_t *locs);
int m_num;
location_t * GTY ((atomic)) m_locs;
};
class GTY(()) string_concat_db
{
public:
string_concat_db ();
void record_string_concatenation (int num, location_t *locs);
bool get_string_concatenation (location_t loc,
int *out_num,
location_t **out_locs);
private:
static location_t get_key_loc (location_t loc);
/* For the fields to be private, we must grant access to the
generated code in gtype-desc.cc. */
friend void ::gt_ggc_mx_string_concat_db (void *x_p);
friend void ::gt_pch_nx_string_concat_db (void *x_p);
friend void ::gt_pch_p_16string_concat_db (void *this_obj, void *x_p,
gt_pointer_operator op,
void *cookie);
hash_map <location_hash, string_concat *> *m_table;
};
#endif
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