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+/* Declarations for variables relating to reading the source file.
+ Used by parsers, lexical analyzers, and error message routines.
+ Copyright (C) 1993-2023 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)
+
+/* Returns the translated string referring to the special location. */
+const char *special_fname_builtin ();
+
+/* 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 char *get_source_text_between (location_t, location_t);
+extern char_span get_source_file_content (const char *file_path);
+
+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;
+
+extern location_t location_with_discriminator (location_t, int);
+extern bool has_discriminator (location_t);
+extern int get_discriminator_from_loc (location_t);
+
+#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. */
+
+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. */
+
+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. */
+
+inline bool
+from_macro_definition_at (location_t loc)
+{
+ return linemap_location_from_macro_definition_p (line_table, loc);
+}
+
+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. */
+
+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. */
+
+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