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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [genattr.c] - Blame information for rev 826

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Line No. Rev Author Line
1 280 jeremybenn
/* Generate attribute information (insn-attr.h) from machine description.
2
   Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004, 2007, 2008
3
   Free Software Foundation, Inc.
4
   Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
5
 
6
This file is part of GCC.
7
 
8
GCC is free software; you can redistribute it and/or modify it under
9
the terms of the GNU General Public License as published by the Free
10
Software Foundation; either version 3, or (at your option) any later
11
version.
12
 
13
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14
WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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for more details.
17
 
18
You should have received a copy of the GNU General Public License
19
along with GCC; see the file COPYING3.  If not see
20
<http://www.gnu.org/licenses/>.  */
21
 
22
 
23
#include "bconfig.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
27
#include "rtl.h"
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#include "errors.h"
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#include "gensupport.h"
30
 
31
 
32
static void write_upcase (const char *);
33
static void gen_attr (rtx);
34
 
35
static void
36
write_upcase (const char *str)
37
{
38
  for (; *str; str++)
39
    putchar (TOUPPER(*str));
40
}
41
 
42
static void
43
gen_attr (rtx attr)
44
{
45
  const char *p, *tag;
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  int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
47
 
48
  printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
49
 
50
  /* If numeric attribute, don't need to write an enum.  */
51
  p = XSTR (attr, 1);
52
  if (*p == '\0')
53
    printf ("extern int get_attr_%s (%s);\n", XSTR (attr, 0),
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            (is_const ? "void" : "rtx"));
55
  else
56
    {
57
      printf ("enum attr_%s {", XSTR (attr, 0));
58
 
59
      while ((tag = scan_comma_elt (&p)) != 0)
60
        {
61
          write_upcase (XSTR (attr, 0));
62
          putchar ('_');
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          while (tag != p)
64
            putchar (TOUPPER (*tag++));
65
          if (*p == ',')
66
            fputs (", ", stdout);
67
        }
68
 
69
      fputs ("};\n", stdout);
70
      printf ("extern enum attr_%s get_attr_%s (%s);\n\n",
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              XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx"));
72
    }
73
 
74
  /* If `length' attribute, write additional function definitions and define
75
     variables used by `insn_current_length'.  */
76
  if (! strcmp (XSTR (attr, 0), "length"))
77
    {
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      puts ("\
79
extern void shorten_branches (rtx);\n\
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extern int insn_default_length (rtx);\n\
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extern int insn_min_length (rtx);\n\
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extern int insn_variable_length_p (rtx);\n\
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extern int insn_current_length (rtx);\n\n\
84
#include \"insn-addr.h\"\n");
85
    }
86
}
87
 
88
int
89
main (int argc, char **argv)
90
{
91
  rtx desc;
92
  int have_delay = 0;
93
  int have_annul_true = 0;
94
  int have_annul_false = 0;
95
  int num_insn_reservations = 0;
96
  int i;
97
 
98
  progname = "genattr";
99
 
100
  if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
101
    return (FATAL_EXIT_CODE);
102
 
103
  puts ("/* Generated automatically by the program `genattr'");
104
  puts ("   from the machine description file `md'.  */\n");
105
  puts ("#ifndef GCC_INSN_ATTR_H");
106
  puts ("#define GCC_INSN_ATTR_H\n");
107
 
108
  /* For compatibility, define the attribute `alternative', which is just
109
     a reference to the variable `which_alternative'.  */
110
 
111
  puts ("#define HAVE_ATTR_alternative");
112
  puts ("#define get_attr_alternative(insn) which_alternative");
113
 
114
  /* Read the machine description.  */
115
 
116
  while (1)
117
    {
118
      int line_no, insn_code_number;
119
 
120
      desc = read_md_rtx (&line_no, &insn_code_number);
121
      if (desc == NULL)
122
        break;
123
 
124
      if (GET_CODE (desc) == DEFINE_ATTR)
125
        gen_attr (desc);
126
 
127
      else if (GET_CODE (desc) == DEFINE_DELAY)
128
        {
129
          if (! have_delay)
130
            {
131
              printf ("#define DELAY_SLOTS\n");
132
              printf ("extern int num_delay_slots (rtx);\n");
133
              printf ("extern int eligible_for_delay (rtx, int, rtx, int);\n\n");
134
              printf ("extern int const_num_delay_slots (rtx);\n\n");
135
              have_delay = 1;
136
            }
137
 
138
          for (i = 0; i < XVECLEN (desc, 1); i += 3)
139
            {
140
              if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
141
                {
142
                  printf ("#define ANNUL_IFTRUE_SLOTS\n");
143
                  printf ("extern int eligible_for_annul_true (rtx, int, rtx, int);\n");
144
                  have_annul_true = 1;
145
                }
146
 
147
              if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
148
                {
149
                  printf ("#define ANNUL_IFFALSE_SLOTS\n");
150
                  printf ("extern int eligible_for_annul_false (rtx, int, rtx, int);\n");
151
                  have_annul_false = 1;
152
                }
153
            }
154
        }
155
 
156
      else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION)
157
        num_insn_reservations++;
158
    }
159
 
160
  if (num_insn_reservations > 0)
161
    {
162
      /* Output interface for pipeline hazards recognition based on
163
         DFA (deterministic finite state automata.  */
164
      printf ("\n#define INSN_SCHEDULING\n");
165
      printf ("\n/* DFA based pipeline interface.  */");
166
      printf ("\n#ifndef AUTOMATON_ALTS\n");
167
      printf ("#define AUTOMATON_ALTS 0\n");
168
      printf ("#endif\n\n");
169
      printf ("\n#ifndef AUTOMATON_STATE_ALTS\n");
170
      printf ("#define AUTOMATON_STATE_ALTS 0\n");
171
      printf ("#endif\n\n");
172
      printf ("#ifndef CPU_UNITS_QUERY\n");
173
      printf ("#define CPU_UNITS_QUERY 0\n");
174
      printf ("#endif\n\n");
175
      /* Interface itself: */
176
      printf ("/* Internal insn code number used by automata.  */\n");
177
      printf ("extern int internal_dfa_insn_code (rtx);\n\n");
178
      printf ("/* Insn latency time defined in define_insn_reservation. */\n");
179
      printf ("extern int insn_default_latency (rtx);\n\n");
180
      printf ("/* Return nonzero if there is a bypass for given insn\n");
181
      printf ("   which is a data producer.  */\n");
182
      printf ("extern int bypass_p (rtx);\n\n");
183
      printf ("/* Insn latency time on data consumed by the 2nd insn.\n");
184
      printf ("   Use the function if bypass_p returns nonzero for\n");
185
      printf ("   the 1st insn. */\n");
186
      printf ("extern int insn_latency (rtx, rtx);\n\n");
187
      printf ("/* Maximal insn latency time possible of all bypasses for this insn.\n");
188
      printf ("   Use the function if bypass_p returns nonzero for\n");
189
      printf ("   the 1st insn. */\n");
190
      printf ("extern int maximal_insn_latency (rtx);\n\n");
191
      printf ("\n#if AUTOMATON_ALTS\n");
192
      printf ("/* The following function returns number of alternative\n");
193
      printf ("   reservations of given insn.  It may be used for better\n");
194
      printf ("   insns scheduling heuristics. */\n");
195
      printf ("extern int insn_alts (rtx);\n\n");
196
      printf ("#endif\n\n");
197
      printf ("/* Maximal possible number of insns waiting results being\n");
198
      printf ("   produced by insns whose execution is not finished. */\n");
199
      printf ("extern const int max_insn_queue_index;\n\n");
200
      printf ("/* Pointer to data describing current state of DFA.  */\n");
201
      printf ("typedef void *state_t;\n\n");
202
      printf ("/* Size of the data in bytes.  */\n");
203
      printf ("extern int state_size (void);\n\n");
204
      printf ("/* Initiate given DFA state, i.e. Set up the state\n");
205
      printf ("   as all functional units were not reserved.  */\n");
206
      printf ("extern void state_reset (state_t);\n");
207
      printf ("/* The following function returns negative value if given\n");
208
      printf ("   insn can be issued in processor state described by given\n");
209
      printf ("   DFA state.  In this case, the DFA state is changed to\n");
210
      printf ("   reflect the current and future reservations by given\n");
211
      printf ("   insn.  Otherwise the function returns minimal time\n");
212
      printf ("   delay to issue the insn.  This delay may be zero\n");
213
      printf ("   for superscalar or VLIW processors.  If the second\n");
214
      printf ("   parameter is NULL the function changes given DFA state\n");
215
      printf ("   as new processor cycle started.  */\n");
216
      printf ("extern int state_transition (state_t, rtx);\n");
217
      printf ("\n#if AUTOMATON_STATE_ALTS\n");
218
      printf ("/* The following function returns number of possible\n");
219
      printf ("   alternative reservations of given insn in given\n");
220
      printf ("   DFA state.  It may be used for better insns scheduling\n");
221
      printf ("   heuristics.  By default the function is defined if\n");
222
      printf ("   macro AUTOMATON_STATE_ALTS is defined because its\n");
223
      printf ("   implementation may require much memory.  */\n");
224
      printf ("extern int state_alts (state_t, rtx);\n");
225
      printf ("#endif\n\n");
226
      printf ("extern int min_issue_delay (state_t, rtx);\n");
227
      printf ("/* The following function returns nonzero if no one insn\n");
228
      printf ("   can be issued in current DFA state. */\n");
229
      printf ("extern int state_dead_lock_p (state_t);\n");
230
      printf ("/* The function returns minimal delay of issue of the 2nd\n");
231
      printf ("   insn after issuing the 1st insn in given DFA state.\n");
232
      printf ("   The 1st insn should be issued in given state (i.e.\n");
233
      printf ("    state_transition should return negative value for\n");
234
      printf ("    the insn and the state).  Data dependencies between\n");
235
      printf ("    the insns are ignored by the function.  */\n");
236
      printf
237
        ("extern int min_insn_conflict_delay (state_t, rtx, rtx);\n");
238
      printf ("/* The following function outputs reservations for given\n");
239
      printf ("   insn as they are described in the corresponding\n");
240
      printf ("   define_insn_reservation.  */\n");
241
      printf ("extern void print_reservation (FILE *, rtx);\n");
242
      printf ("\n#if CPU_UNITS_QUERY\n");
243
      printf ("/* The following function returns code of functional unit\n");
244
      printf ("   with given name (see define_cpu_unit). */\n");
245
      printf ("extern int get_cpu_unit_code (const char *);\n");
246
      printf ("/* The following function returns nonzero if functional\n");
247
      printf ("   unit with given code is currently reserved in given\n");
248
      printf ("   DFA state.  */\n");
249
      printf ("extern int cpu_unit_reservation_p (state_t, int);\n");
250
      printf ("#endif\n\n");
251
      printf ("/* The following function returns true if insn\n");
252
      printf ("   has a dfa reservation.  */\n");
253
      printf ("extern bool insn_has_dfa_reservation_p (rtx);\n\n");
254
      printf ("/* Clean insn code cache.  It should be called if there\n");
255
      printf ("   is a chance that condition value in a\n");
256
      printf ("   define_insn_reservation will be changed after\n");
257
      printf ("   last call of dfa_start.  */\n");
258
      printf ("extern void dfa_clean_insn_cache (void);\n\n");
259
      printf ("extern void dfa_clear_single_insn_cache (rtx);\n\n");
260
      printf ("/* Initiate and finish work with DFA.  They should be\n");
261
      printf ("   called as the first and the last interface\n");
262
      printf ("   functions.  */\n");
263
      printf ("extern void dfa_start (void);\n");
264
      printf ("extern void dfa_finish (void);\n");
265
    }
266
  else
267
    {
268
      /* Otherwise we do no scheduling, but we need these typedefs
269
         in order to avoid uglifying other code with more ifdefs.  */
270
      printf ("typedef void *state_t;\n\n");
271
    }
272
 
273
  /* Output flag masks for use by reorg.
274
 
275
     Flags are used to hold branch direction and prediction information
276
     for use by eligible_for_...  */
277
  printf("\n#define ATTR_FLAG_forward\t0x1\n");
278
  printf("#define ATTR_FLAG_backward\t0x2\n");
279
  printf("#define ATTR_FLAG_likely\t0x4\n");
280
  printf("#define ATTR_FLAG_very_likely\t0x8\n");
281
  printf("#define ATTR_FLAG_unlikely\t0x10\n");
282
  printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
283
 
284
  puts("\n#endif /* GCC_INSN_ATTR_H */");
285
 
286
  if (ferror (stdout) || fflush (stdout) || fclose (stdout))
287
    return FATAL_EXIT_CODE;
288
 
289
  return SUCCESS_EXIT_CODE;
290
}

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