source: trunk/third/gcc/genconfig.c @ 8834

Revision 8834, 8.7 KB checked in by ghudson, 28 years ago (diff)
This commit was generated by cvs2svn to compensate for changes in r8833, which included commits to RCS files with non-trunk default branches.
Line 
1/* Generate from machine description:
2
3   - some #define configuration flags.
4   Copyright (C) 1987, 1991 Free Software Foundation, Inc.
5
6This file is part of GNU CC.
7
8GNU CC is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2, or (at your option)
11any later version.
12
13GNU CC is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with GNU CC; see the file COPYING.  If not, write to
20the Free Software Foundation, 59 Temple Place - Suite 330,
21Boston, MA 02111-1307, USA.  */
22
23
24#include <stdio.h>
25#include "hconfig.h"
26#include "rtl.h"
27#include "obstack.h"
28
29static struct obstack obstack;
30struct obstack *rtl_obstack = &obstack;
31
32#define obstack_chunk_alloc xmalloc
33#define obstack_chunk_free free
34
35extern void free ();
36extern rtx read_rtx ();
37
38/* flags to determine output of machine description dependent #define's.  */
39static int max_recog_operands;  /* Largest operand number seen.  */
40static int max_dup_operands;    /* Largest number of match_dup in any insn.  */
41static int max_clobbers_per_insn;
42static int register_constraint_flag;
43static int have_cc0_flag;
44static int have_cmove_flag;
45static int have_lo_sum_flag;
46
47/* Maximum number of insns seen in a split.  */
48static int max_insns_per_split = 1;
49
50static int clobbers_seen_this_insn;
51static int dup_operands_seen_this_insn;
52
53char *xmalloc ();
54static void fatal ();
55void fancy_abort ();
56
57/* RECOG_P will be non-zero if this pattern was seen in a context where it will
58   be used to recognize, rather than just generate an insn.
59
60   NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
61   of a SET whose destination is not (pc).  */
62
63static void
64walk_insn_part (part, recog_p, non_pc_set_src)
65     rtx part;
66     int recog_p;
67     int non_pc_set_src;
68{
69  register int i, j;
70  register RTX_CODE code;
71  register char *format_ptr;
72
73  if (part == 0)
74    return;
75
76  code = GET_CODE (part);
77  switch (code)
78    {
79    case CLOBBER:
80      clobbers_seen_this_insn++;
81      break;
82
83    case MATCH_OPERAND:
84      if (XINT (part, 0) > max_recog_operands)
85        max_recog_operands = XINT (part, 0);
86      if (XSTR (part, 2) && *XSTR (part, 2))
87        register_constraint_flag = 1;
88      return;
89
90    case MATCH_OP_DUP:
91    case MATCH_PAR_DUP:
92      ++dup_operands_seen_this_insn;
93    case MATCH_SCRATCH:
94    case MATCH_PARALLEL:
95    case MATCH_OPERATOR:
96      if (XINT (part, 0) > max_recog_operands)
97        max_recog_operands = XINT (part, 0);
98      /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
99         MATCH_PARALLEL.  */
100      break;
101
102    case LABEL_REF:
103      if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
104        break;
105      return;
106
107    case MATCH_DUP:
108      ++dup_operands_seen_this_insn;
109      if (XINT (part, 0) > max_recog_operands)
110        max_recog_operands = XINT (part, 0);
111      return;
112
113    case CC0:
114      if (recog_p)
115        have_cc0_flag = 1;
116      return;
117
118    case LO_SUM:
119      if (recog_p)
120        have_lo_sum_flag = 1;
121      return;
122
123    case SET:
124      walk_insn_part (SET_DEST (part), 0, recog_p);
125      walk_insn_part (SET_SRC (part), recog_p,
126                      GET_CODE (SET_DEST (part)) != PC);
127      return;
128
129    case IF_THEN_ELSE:
130      /* Only consider this machine as having a conditional move if the
131         two arms of the IF_THEN_ELSE are both MATCH_OPERAND.  Otherwise,
132         we have some specific IF_THEN_ELSE construct (like the doz
133         instruction on the RS/6000) that can't be used in the general
134         context we want it for.  */
135
136      if (recog_p && non_pc_set_src
137          && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
138          && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
139        have_cmove_flag = 1;
140      break;
141
142    case REG: case CONST_INT: case SYMBOL_REF:
143    case PC:
144      return;
145    }
146
147  format_ptr = GET_RTX_FORMAT (GET_CODE (part));
148
149  for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
150    switch (*format_ptr++)
151      {
152      case 'e':
153      case 'u':
154        walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
155        break;
156      case 'E':
157        if (XVEC (part, i) != NULL)
158          for (j = 0; j < XVECLEN (part, i); j++)
159            walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
160        break;
161      }
162}
163
164static void
165gen_insn (insn)
166     rtx insn;
167{
168  int i;
169
170  /* Walk the insn pattern to gather the #define's status.  */
171  clobbers_seen_this_insn = 0;
172  dup_operands_seen_this_insn = 0;
173  if (XVEC (insn, 1) != 0)
174    for (i = 0; i < XVECLEN (insn, 1); i++)
175      walk_insn_part (XVECEXP (insn, 1, i), 1, 0);
176
177  if (clobbers_seen_this_insn > max_clobbers_per_insn)
178    max_clobbers_per_insn = clobbers_seen_this_insn;
179  if (dup_operands_seen_this_insn > max_dup_operands)
180    max_dup_operands = dup_operands_seen_this_insn;
181}
182
183/* Similar but scan a define_expand.  */
184
185static void
186gen_expand (insn)
187     rtx insn;
188{
189  int i;
190
191  /* Walk the insn pattern to gather the #define's status.  */
192
193  /* Note that we don't bother recording the number of MATCH_DUPs
194     that occur in a gen_expand, because only reload cares about that.  */
195  if (XVEC (insn, 1) != 0)
196    for (i = 0; i < XVECLEN (insn, 1); i++)
197      {
198        /* Compute the maximum SETs and CLOBBERS
199           in any one of the sub-insns;
200           don't sum across all of them.  */
201        clobbers_seen_this_insn = 0;
202
203        walk_insn_part (XVECEXP (insn, 1, i), 0, 0);
204
205        if (clobbers_seen_this_insn > max_clobbers_per_insn)
206          max_clobbers_per_insn = clobbers_seen_this_insn;
207      }
208}
209
210/* Similar but scan a define_split.  */
211
212static void
213gen_split (split)
214     rtx split;
215{
216  int i;
217
218  /* Look through the patterns that are matched
219     to compute the maximum operand number.  */
220  for (i = 0; i < XVECLEN (split, 0); i++)
221    walk_insn_part (XVECEXP (split, 0, i), 1, 0);
222  /* Look at the number of insns this insn could split into.  */
223  if (XVECLEN (split, 2) > max_insns_per_split)
224    max_insns_per_split = XVECLEN (split, 2);
225}
226
227static void
228gen_peephole (peep)
229     rtx peep;
230{
231  int i;
232
233  /* Look through the patterns that are matched
234     to compute the maximum operand number.  */
235  for (i = 0; i < XVECLEN (peep, 0); i++)
236    walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
237}
238
239char *
240xmalloc (size)
241     unsigned size;
242{
243  register char *val = (char *) malloc (size);
244
245  if (val == 0)
246    fatal ("virtual memory exhausted");
247
248  return val;
249}
250
251char *
252xrealloc (ptr, size)
253     char *ptr;
254     unsigned size;
255{
256  char *result = (char *) realloc (ptr, size);
257  if (!result)
258    fatal ("virtual memory exhausted");
259  return result;
260}
261
262static void
263fatal (s, a1, a2)
264     char *s;
265{
266  fprintf (stderr, "genconfig: ");
267  fprintf (stderr, s, a1, a2);
268  fprintf (stderr, "\n");
269  exit (FATAL_EXIT_CODE);
270}
271
272/* More 'friendly' abort that prints the line and file.
273   config.h can #define abort fancy_abort if you like that sort of thing.  */
274
275void
276fancy_abort ()
277{
278  fatal ("Internal gcc abort.");
279}
280
281int
282main (argc, argv)
283     int argc;
284     char **argv;
285{
286  rtx desc;
287  FILE *infile;
288  register int c;
289
290  obstack_init (rtl_obstack);
291
292  if (argc <= 1)
293    fatal ("No input file name.");
294
295  infile = fopen (argv[1], "r");
296  if (infile == 0)
297    {
298      perror (argv[1]);
299      exit (FATAL_EXIT_CODE);
300    }
301
302  init_rtl ();
303
304  printf ("/* Generated automatically by the program `genconfig'\n\
305from the machine description file `md'.  */\n\n");
306
307  /* Allow at least 10 operands for the sake of asm constructs.  */
308  max_recog_operands = 9;  /* We will add 1 later.  */
309  max_dup_operands = 1;
310
311  /* Read the machine description.  */
312
313  while (1)
314    {
315      c = read_skip_spaces (infile);
316      if (c == EOF)
317        break;
318      ungetc (c, infile);
319
320      desc = read_rtx (infile);
321      if (GET_CODE (desc) == DEFINE_INSN)
322        gen_insn (desc);
323      if (GET_CODE (desc) == DEFINE_EXPAND)
324        gen_expand (desc);
325      if (GET_CODE (desc) == DEFINE_SPLIT)
326        gen_split (desc);
327      if (GET_CODE (desc) == DEFINE_PEEPHOLE)
328        gen_peephole (desc);
329    }
330
331  printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
332
333  printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
334
335  /* This is conditionally defined, in case the user writes code which emits
336     more splits than we can readily see (and knows s/he does it).  */
337  printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
338          max_insns_per_split);
339
340  if (register_constraint_flag)
341    printf ("#define REGISTER_CONSTRAINTS\n");
342
343  if (have_cc0_flag)
344    printf ("#define HAVE_cc0\n");
345
346  if (have_cmove_flag)
347    printf ("#define HAVE_conditional_move\n");
348
349  if (have_lo_sum_flag)
350    printf ("#define HAVE_lo_sum\n");
351
352  fflush (stdout);
353  exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
354  /* NOTREACHED */
355  return 0;
356}
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