1 /* MD reader definitions.
2 Copyright (C) 1987-2018 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
19
20 #ifndef GCC_READ_MD_H
21 #define GCC_READ_MD_H
22
23 #include "obstack.h"
24
25 /* Records a position in the file. */
26 struct file_location {
file_locationfile_location27 file_location () {}
28 file_location (const char *, int, int);
29
30 const char *filename;
31 int lineno;
32 int colno;
33 };
34
file_location(const char * filename_in,int lineno_in,int colno_in)35 inline file_location::file_location (const char *filename_in, int lineno_in, int colno_in)
36 : filename (filename_in), lineno (lineno_in), colno (colno_in) {}
37
38 /* Holds one symbol or number in the .md file. */
39 struct md_name {
40 /* The name as it appeared in the .md file. Names are syntactically
41 limited to the length of this buffer. */
42 char buffer[256];
43
44 /* The name that should actually be used by the generator programs.
45 This is an expansion of NAME, after things like constant substitution. */
46 char *string;
47 };
48
49 /* This structure represents a constant defined by define_constant,
50 define_enum, or such-like. */
51 struct md_constant {
52 /* The name of the constant. */
53 char *name;
54
55 /* The string to which the constants expands. */
56 char *value;
57
58 /* If the constant is associated with a enumeration, this field
59 points to that enumeration, otherwise it is null. */
60 struct enum_type *parent_enum;
61 };
62
63 /* This structure represents one value in an enum_type. */
64 struct enum_value {
65 /* The next value in the enum, or null if this is the last. */
66 struct enum_value *next;
67
68 /* The name of the value as it appears in the .md file. */
69 char *name;
70
71 /* The definition of the related C value. */
72 struct md_constant *def;
73 };
74
75 /* This structure represents an enum defined by define_enum or the like. */
76 struct enum_type {
77 /* The C name of the enumeration. */
78 char *name;
79
80 /* True if this is an md-style enum (DEFINE_ENUM) rather than
81 a C-style enum (DEFINE_C_ENUM). */
82 bool md_p;
83
84 /* The values of the enumeration. There is always at least one. */
85 struct enum_value *values;
86
87 /* A pointer to the null terminator in VALUES. */
88 struct enum_value **tail_ptr;
89
90 /* The number of enumeration values. */
91 unsigned int num_values;
92 };
93
94 /* A class for reading .md files and RTL dump files.
95
96 Implemented in read-md.c.
97
98 This class has responsibility for reading chars from input files, and
99 for certain common top-level directives including the "include"
100 directive.
101
102 It does not handle parsing the hierarchically-nested expressions of
103 rtl.def; for that see the rtx_reader subclass below (implemented in
104 read-rtl.c). */
105
106 class md_reader
107 {
108 public:
109 md_reader (bool compact);
110 virtual ~md_reader ();
111
112 bool read_md_files (int, const char **, bool (*) (const char *));
113 bool read_file (const char *filename);
114 bool read_file_fragment (const char *filename,
115 int first_line,
116 int last_line);
117
118 /* A hook that handles a single .md-file directive, up to but not
119 including the closing ')'. It takes two arguments: the file position
120 at which the directive started, and the name of the directive. The next
121 unread character is the optional space after the directive name. */
122 virtual void handle_unknown_directive (file_location, const char *) = 0;
123
124 file_location get_current_location () const;
125
is_compact()126 bool is_compact () const { return m_compact; }
127
128 /* Defined in read-md.c. */
129 int read_char (void);
130 void unread_char (int ch);
131 file_location read_name (struct md_name *name);
132 file_location read_name_or_nil (struct md_name *);
133 void read_escape ();
134 char *read_quoted_string ();
135 char *read_braced_string ();
136 char *read_string (int star_if_braced);
137 void read_skip_construct (int depth, file_location loc);
138 void require_char (char expected);
139 void require_char_ws (char expected);
140 void require_word_ws (const char *expected);
141 int peek_char (void);
142
143 void set_md_ptr_loc (const void *ptr, const char *filename, int lineno);
144 const struct ptr_loc *get_md_ptr_loc (const void *ptr);
145 void copy_md_ptr_loc (const void *new_ptr, const void *old_ptr);
146 void fprint_md_ptr_loc (FILE *outf, const void *ptr);
147 void print_md_ptr_loc (const void *ptr);
148
149 struct enum_type *lookup_enum_type (const char *name);
150 void traverse_enum_types (htab_trav callback, void *info);
151
152 void handle_constants ();
153 void traverse_md_constants (htab_trav callback, void *info);
154 void handle_enum (file_location loc, bool md_p);
155
156 const char *join_c_conditions (const char *cond1, const char *cond2);
157 void fprint_c_condition (FILE *outf, const char *cond);
158 void print_c_condition (const char *cond);
159
160 /* Defined in read-rtl.c. */
161 const char *apply_iterator_to_string (const char *string);
162 rtx copy_rtx_for_iterators (rtx original);
163 void read_conditions ();
164 void record_potential_iterator_use (struct iterator_group *group,
165 rtx x, unsigned int index,
166 const char *name);
167 struct mapping *read_mapping (struct iterator_group *group, htab_t table);
168
get_top_level_filename()169 const char *get_top_level_filename () const { return m_toplevel_fname; }
get_filename()170 const char *get_filename () const { return m_read_md_filename; }
get_lineno()171 int get_lineno () const { return m_read_md_lineno; }
get_colno()172 int get_colno () const { return m_read_md_colno; }
173
get_string_obstack()174 struct obstack *get_string_obstack () { return &m_string_obstack; }
get_md_constants()175 htab_t get_md_constants () { return m_md_constants; }
176
177 private:
178 /* A singly-linked list of filenames. */
179 struct file_name_list {
180 struct file_name_list *next;
181 const char *fname;
182 };
183
184 private:
185 void handle_file ();
186 void handle_toplevel_file ();
187 void handle_include (file_location loc);
188 void add_include_path (const char *arg);
189
190 bool read_name_1 (struct md_name *name, file_location *out_loc);
191
192 private:
193 /* Are we reading a compact dump? */
194 bool m_compact;
195
196 /* The name of the toplevel file that indirectly included
197 m_read_md_file. */
198 const char *m_toplevel_fname;
199
200 /* The directory part of m_toplevel_fname
201 NULL if m_toplevel_fname is a bare filename. */
202 char *m_base_dir;
203
204 /* The file we are reading. */
205 FILE *m_read_md_file;
206
207 /* The filename of m_read_md_file. */
208 const char *m_read_md_filename;
209
210 /* The current line number in m_read_md_file. */
211 int m_read_md_lineno;
212
213 /* The current column number in m_read_md_file. */
214 int m_read_md_colno;
215
216 /* The column number before the last newline, so that
217 we can handle unread_char ('\n') at least once whilst
218 retaining column information. */
219 int m_last_line_colno;
220
221 /* The first directory to search. */
222 file_name_list *m_first_dir_md_include;
223
224 /* A pointer to the null terminator of the md include chain. */
225 file_name_list **m_last_dir_md_include_ptr;
226
227 /* Obstack used for allocating MD strings. */
228 struct obstack m_string_obstack;
229
230 /* A table of ptr_locs, hashed on the PTR field. */
231 htab_t m_ptr_locs;
232
233 /* An obstack for the above. Plain xmalloc is a bit heavyweight for a
234 small structure like ptr_loc. */
235 struct obstack m_ptr_loc_obstack;
236
237 /* A hash table of triples (A, B, C), where each of A, B and C is a condition
238 and A is equivalent to "B && C". This is used to keep track of the source
239 of conditions that are made up of separate MD strings (such as the split
240 condition of a define_insn_and_split). */
241 htab_t m_joined_conditions;
242
243 /* An obstack for allocating joined_conditions entries. */
244 struct obstack m_joined_conditions_obstack;
245
246 /* A table of md_constant structures, hashed by name. Null if no
247 constant expansion should occur. */
248 htab_t m_md_constants;
249
250 /* A table of enum_type structures, hashed by name. */
251 htab_t m_enum_types;
252
253 /* If non-zero, filter the input to just this subset of lines. */
254 int m_first_line;
255 int m_last_line;
256 };
257
258 /* Global singleton; constrast with rtx_reader_ptr below. */
259 extern md_reader *md_reader_ptr;
260
261 /* An md_reader subclass which skips unknown directives, for
262 the gen* tools that purely use read-md.o. */
263
264 class noop_reader : public md_reader
265 {
266 public:
noop_reader()267 noop_reader () : md_reader (false) {}
268
269 /* A dummy implementation which skips unknown directives. */
270 void handle_unknown_directive (file_location, const char *);
271 };
272
273 /* An md_reader subclass that actually handles full hierarchical
274 rtx expressions.
275
276 Implemented in read-rtl.c. */
277
278 class rtx_reader : public md_reader
279 {
280 public:
281 rtx_reader (bool compact);
282 ~rtx_reader ();
283
284 bool read_rtx (const char *rtx_name, vec<rtx> *rtxen);
285 rtx read_rtx_code (const char *code_name);
286 virtual rtx read_rtx_operand (rtx return_rtx, int idx);
287 rtx read_nested_rtx ();
288 rtx read_rtx_variadic (rtx form);
289 char *read_until (const char *terminator_chars, bool consume_terminator);
290
handle_any_trailing_information(rtx)291 virtual void handle_any_trailing_information (rtx) {}
postprocess(rtx x)292 virtual rtx postprocess (rtx x) { return x; }
293
294 /* Hook to allow function_reader subclass to put STRINGBUF into gc-managed
295 memory, rather than within an obstack.
296 This base class implementation is a no-op. */
finalize_string(char * stringbuf)297 virtual const char *finalize_string (char *stringbuf) { return stringbuf; }
298
299 protected:
300 /* Analogous to rtx_writer's m_in_call_function_usage. */
301 bool m_in_call_function_usage;
302
303 /* Support for "reuse_rtx" directives. */
304 auto_vec<rtx> m_reuse_rtx_by_id;
305 };
306
307 /* Global singleton; constrast with md_reader_ptr above. */
308 extern rtx_reader *rtx_reader_ptr;
309
310 extern void (*include_callback) (const char *);
311
312 /* Read the next character from the MD file. */
313
314 static inline int
read_char(void)315 read_char (void)
316 {
317 return md_reader_ptr->read_char ();
318 }
319
320 /* Put back CH, which was the last character read from the MD file. */
321
322 static inline void
unread_char(int ch)323 unread_char (int ch)
324 {
325 md_reader_ptr->unread_char (ch);
326 }
327
328 extern hashval_t leading_string_hash (const void *);
329 extern int leading_string_eq_p (const void *, const void *);
330 extern const char *join_c_conditions (const char *, const char *);
331 extern void message_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
332 extern void error_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
333 extern void fatal_at (file_location, const char *, ...) ATTRIBUTE_PRINTF_2;
334 extern void fatal_with_file_and_line (const char *, ...)
335 ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
336 extern void fatal_expected_char (int, int) ATTRIBUTE_NORETURN;
337 extern int read_skip_spaces (void);
338 extern int n_comma_elts (const char *);
339 extern const char *scan_comma_elt (const char **);
340 extern void upcase_string (char *);
341 extern void traverse_enum_types (htab_trav, void *);
342 extern struct enum_type *lookup_enum_type (const char *);
343
344 #endif /* GCC_READ_MD_H */
345