* except.c (expand_start_catch_block): We only need the rethrow
[official-gcc.git] / gcc / genattr.c
blobc351fc5ad5f1818cbca358633e8d2b0dba384e9d
1 /* Generate attribute information (insn-attr.h) from machine description.
2 Copyright (C) 1991, 1994, 1996 Free Software Foundation, Inc.
3 Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
5 This file is part of GNU CC.
7 GNU CC 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 2, or (at your option)
10 any later version.
12 GNU CC 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 GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #include <stdio.h>
24 #include "hconfig.h"
25 #include "rtl.h"
26 #include "obstack.h"
28 static struct obstack obstack;
29 struct obstack *rtl_obstack = &obstack;
31 #define obstack_chunk_alloc xmalloc
32 #define obstack_chunk_free free
34 extern void free PROTO((void *));
35 extern rtx read_rtx PROTO((FILE *));
37 char *xmalloc PROTO((unsigned));
38 static void fatal ();
39 void fancy_abort PROTO((void));
41 /* A range of values. */
43 struct range
45 int min;
46 int max;
49 /* Record information about each function unit mentioned in a
50 DEFINE_FUNCTION_UNIT. */
52 struct function_unit
54 char *name; /* Function unit name. */
55 struct function_unit *next; /* Next function unit. */
56 int multiplicity; /* Number of units of this type. */
57 int simultaneity; /* Maximum number of simultaneous insns
58 on this function unit or 0 if unlimited. */
59 struct range ready_cost; /* Range of ready cost values. */
60 struct range issue_delay; /* Range of issue delay values. */
63 static void
64 extend_range (range, min, max)
65 struct range *range;
66 int min;
67 int max;
69 if (range->min > min) range->min = min;
70 if (range->max < max) range->max = max;
73 static void
74 init_range (range)
75 struct range *range;
77 range->min = 100000;
78 range->max = -1;
81 static void
82 write_upcase (str)
83 char *str;
85 for (; *str; str++)
86 if (*str >= 'a' && *str <= 'z')
87 printf ("%c", *str - 'a' + 'A');
88 else
89 printf ("%c", *str);
92 static void
93 gen_attr (attr)
94 rtx attr;
96 char *p;
98 printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
100 /* If numeric attribute, don't need to write an enum. */
101 if (*XSTR (attr, 1) == '\0')
102 printf ("extern int get_attr_%s ();\n", XSTR (attr, 0));
103 else
105 printf ("enum attr_%s {", XSTR (attr, 0));
106 write_upcase (XSTR (attr, 0));
107 printf ("_");
109 for (p = XSTR (attr, 1); *p != '\0'; p++)
111 if (*p == ',')
113 printf (", ");
114 write_upcase (XSTR (attr, 0));
115 printf ("_");
117 else if (*p >= 'a' && *p <= 'z')
118 printf ("%c", *p - 'a' + 'A');
119 else
120 printf ("%c", *p);
123 printf ("};\n");
124 printf ("extern enum attr_%s get_attr_%s ();\n\n",
125 XSTR (attr, 0), XSTR (attr, 0));
128 /* If `length' attribute, write additional function definitions and define
129 variables used by `insn_current_length'. */
130 if (! strcmp (XSTR (attr, 0), "length"))
132 printf ("extern void init_lengths ();\n");
133 printf ("extern void shorten_branches PROTO((rtx));\n");
134 printf ("extern int insn_default_length PROTO((rtx));\n");
135 printf ("extern int insn_variable_length_p PROTO((rtx));\n");
136 printf ("extern int insn_current_length PROTO((rtx));\n\n");
137 printf ("extern int *insn_addresses;\n");
138 printf ("extern int insn_current_address;\n\n");
142 static void
143 write_units (num_units, multiplicity, simultaneity,
144 ready_cost, issue_delay, blockage)
145 int num_units;
146 struct range *multiplicity;
147 struct range *simultaneity;
148 struct range *ready_cost;
149 struct range *issue_delay;
150 struct range *blockage;
152 int i, q_size;
154 printf ("#define INSN_SCHEDULING\n\n");
155 printf ("extern int result_ready_cost PROTO((rtx));\n");
156 printf ("extern int function_units_used PROTO((rtx));\n\n");
157 printf ("extern struct function_unit_desc\n");
158 printf ("{\n");
159 printf (" char *name;\n");
160 printf (" int bitmask;\n");
161 printf (" int multiplicity;\n");
162 printf (" int simultaneity;\n");
163 printf (" int default_cost;\n");
164 printf (" int max_issue_delay;\n");
165 printf (" int (*ready_cost_function) ();\n");
166 printf (" int (*conflict_cost_function) ();\n");
167 printf (" int max_blockage;\n");
168 printf (" unsigned int (*blockage_range_function) ();\n");
169 printf (" int (*blockage_function) ();\n");
170 printf ("} function_units[];\n\n");
171 printf ("#define FUNCTION_UNITS_SIZE %d\n", num_units);
172 printf ("#define MIN_MULTIPLICITY %d\n", multiplicity->min);
173 printf ("#define MAX_MULTIPLICITY %d\n", multiplicity->max);
174 printf ("#define MIN_SIMULTANEITY %d\n", simultaneity->min);
175 printf ("#define MAX_SIMULTANEITY %d\n", simultaneity->max);
176 printf ("#define MIN_READY_COST %d\n", ready_cost->min);
177 printf ("#define MAX_READY_COST %d\n", ready_cost->max);
178 printf ("#define MIN_ISSUE_DELAY %d\n", issue_delay->min);
179 printf ("#define MAX_ISSUE_DELAY %d\n", issue_delay->max);
180 printf ("#define MIN_BLOCKAGE %d\n", blockage->min);
181 printf ("#define MAX_BLOCKAGE %d\n", blockage->max);
182 for (i = 0; (1 << i) < blockage->max; i++)
184 printf ("#define BLOCKAGE_BITS %d\n", i + 1);
186 /* INSN_QUEUE_SIZE is a power of two larger than MAX_BLOCKAGE and
187 MAX_READY_COST. This is the longest time an isnsn may be queued. */
188 i = MAX (blockage->max, ready_cost->max);
189 for (q_size = 1; q_size <= i; q_size <<= 1)
191 printf ("#define INSN_QUEUE_SIZE %d\n", q_size);
194 char *
195 xmalloc (size)
196 unsigned size;
198 register char *val = (char *) malloc (size);
200 if (val == 0)
201 fatal ("virtual memory exhausted");
202 return val;
205 char *
206 xrealloc (ptr, size)
207 char *ptr;
208 unsigned size;
210 char * result = (char *) realloc (ptr, size);
211 if (!result)
212 fatal ("virtual memory exhausted");
213 return result;
216 static void
217 fatal (s, a1, a2)
218 char *s;
220 fprintf (stderr, "genattr: ");
221 fprintf (stderr, s, a1, a2);
222 fprintf (stderr, "\n");
223 exit (FATAL_EXIT_CODE);
226 /* More 'friendly' abort that prints the line and file.
227 config.h can #define abort fancy_abort if you like that sort of thing. */
229 void
230 fancy_abort ()
232 fatal ("Internal gcc abort.");
236 main (argc, argv)
237 int argc;
238 char **argv;
240 rtx desc;
241 FILE *infile;
242 register int c;
243 int have_delay = 0;
244 int have_annul_true = 0;
245 int have_annul_false = 0;
246 int num_units = 0;
247 struct range all_simultaneity, all_multiplicity;
248 struct range all_ready_cost, all_issue_delay, all_blockage;
249 struct function_unit *units = 0, *unit;
250 int i;
252 init_range (&all_multiplicity);
253 init_range (&all_simultaneity);
254 init_range (&all_ready_cost);
255 init_range (&all_issue_delay);
256 init_range (&all_blockage);
258 obstack_init (rtl_obstack);
260 if (argc <= 1)
261 fatal ("No input file name.");
263 infile = fopen (argv[1], "r");
264 if (infile == 0)
266 perror (argv[1]);
267 exit (FATAL_EXIT_CODE);
270 init_rtl ();
272 printf ("/* Generated automatically by the program `genattr'\n\
273 from the machine description file `md'. */\n\n");
275 /* For compatibility, define the attribute `alternative', which is just
276 a reference to the variable `which_alternative'. */
278 printf ("#define HAVE_ATTR_alternative\n");
279 printf ("#define get_attr_alternative(insn) which_alternative\n");
281 /* Read the machine description. */
283 while (1)
285 c = read_skip_spaces (infile);
286 if (c == EOF)
287 break;
288 ungetc (c, infile);
290 desc = read_rtx (infile);
291 if (GET_CODE (desc) == DEFINE_ATTR)
292 gen_attr (desc);
294 else if (GET_CODE (desc) == DEFINE_DELAY)
296 if (! have_delay)
298 printf ("#define DELAY_SLOTS\n");
299 printf ("extern int num_delay_slots PROTO((rtx));\n");
300 printf ("extern int eligible_for_delay PROTO((rtx, int, rtx, int));\n\n");
301 printf ("extern int const_num_delay_slots PROTO((rtx));\n\n");
302 have_delay = 1;
305 for (i = 0; i < XVECLEN (desc, 1); i += 3)
307 if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
309 printf ("#define ANNUL_IFTRUE_SLOTS\n");
310 printf ("extern int eligible_for_annul_true ();\n");
311 have_annul_true = 1;
314 if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
316 printf ("#define ANNUL_IFFALSE_SLOTS\n");
317 printf ("extern int eligible_for_annul_false ();\n");
318 have_annul_false = 1;
323 else if (GET_CODE (desc) == DEFINE_FUNCTION_UNIT)
325 char *name = XSTR (desc, 0);
326 int multiplicity = XINT (desc, 1);
327 int simultaneity = XINT (desc, 2);
328 int ready_cost = MAX (XINT (desc, 4), 1);
329 int issue_delay = MAX (XINT (desc, 5), 1);
330 int issueexp_p = (XVEC (desc, 6) != 0);
332 for (unit = units; unit; unit = unit->next)
333 if (strcmp (unit->name, name) == 0)
334 break;
336 if (unit == 0)
338 int len = strlen (name) + 1;
339 unit = (struct function_unit *)
340 alloca (sizeof (struct function_unit));
341 unit->name = (char *) alloca (len);
342 bcopy (name, unit->name, len);
343 unit->multiplicity = multiplicity;
344 unit->simultaneity = simultaneity;
345 unit->ready_cost.min = unit->ready_cost.max = ready_cost;
346 unit->issue_delay.min = unit->issue_delay.max = issue_delay;
347 unit->next = units;
348 units = unit;
349 num_units++;
351 extend_range (&all_multiplicity, multiplicity, multiplicity);
352 extend_range (&all_simultaneity, simultaneity, simultaneity);
354 else if (unit->multiplicity != multiplicity
355 || unit->simultaneity != simultaneity)
356 fatal ("Differing specifications given for `%s' function unit.",
357 unit->name);
359 extend_range (&unit->ready_cost, ready_cost, ready_cost);
360 extend_range (&unit->issue_delay,
361 issueexp_p ? 1 : issue_delay, issue_delay);
362 extend_range (&all_ready_cost,
363 unit->ready_cost.min, unit->ready_cost.max);
364 extend_range (&all_issue_delay,
365 unit->issue_delay.min, unit->issue_delay.max);
369 if (num_units > 0)
371 /* Compute the range of blockage cost values. See genattrtab.c
372 for the derivation. BLOCKAGE (E,C) when SIMULTANEITY is zero is
374 MAX (ISSUE-DELAY (E,C),
375 READY-COST (E) - (READY-COST (C) - 1))
377 and otherwise
379 MAX (ISSUE-DELAY (E,C),
380 READY-COST (E) - (READY-COST (C) - 1),
381 READY-COST (E) - FILL-TIME) */
383 for (unit = units; unit; unit = unit->next)
385 struct range blockage;
387 blockage = unit->issue_delay;
388 blockage.max = MAX (unit->ready_cost.max
389 - (unit->ready_cost.min - 1),
390 blockage.max);
391 blockage.min = MAX (1, blockage.min);
393 if (unit->simultaneity != 0)
395 int fill_time = ((unit->simultaneity - 1)
396 * unit->issue_delay.min);
397 blockage.min = MAX (unit->ready_cost.min - fill_time,
398 blockage.min);
399 blockage.max = MAX (unit->ready_cost.max - fill_time,
400 blockage.max);
402 extend_range (&all_blockage, blockage.min, blockage.max);
405 write_units (num_units, &all_multiplicity, &all_simultaneity,
406 &all_ready_cost, &all_issue_delay, &all_blockage);
409 /* Output flag masks for use by reorg.
411 Flags are used to hold branch direction and prediction information
412 for use by eligible_for_... */
413 printf("\n#define ATTR_FLAG_forward\t0x1\n");
414 printf("#define ATTR_FLAG_backward\t0x2\n");
415 printf("#define ATTR_FLAG_likely\t0x4\n");
416 printf("#define ATTR_FLAG_very_likely\t0x8\n");
417 printf("#define ATTR_FLAG_unlikely\t0x10\n");
418 printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
420 fflush (stdout);
421 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
422 /* NOTREACHED */
423 return 0;