1 /* Generate from machine description:
2 - some #define configuration flags.
3 Copyright (C) 1987, 1991, 1997, 1998 Free Software Foundation, Inc.
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)
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. */
28 static struct obstack obstack;
29 struct obstack *rtl_obstack = &obstack;
31 #define obstack_chunk_alloc xmalloc
32 #define obstack_chunk_free free
34 /* Define this so we can link with print-rtl.o to get debug_rtx function. */
35 char **insn_name_ptr = 0;
37 /* flags to determine output of machine description dependent #define's. */
38 static int max_recog_operands; /* Largest operand number seen. */
39 static int max_dup_operands; /* Largest number of match_dup in any insn. */
40 static int max_clobbers_per_insn;
41 static int register_constraint_flag;
42 static int have_cc0_flag;
43 static int have_cmove_flag;
44 static int have_lo_sum_flag;
46 /* Maximum number of insns seen in a split. */
47 static int max_insns_per_split = 1;
49 static int clobbers_seen_this_insn;
50 static int dup_operands_seen_this_insn;
52 char *xmalloc PROTO((unsigned));
53 static void fatal PVPROTO ((char *, ...))
54 ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
55 void fancy_abort PROTO((void)) ATTRIBUTE_NORETURN;
57 static void walk_insn_part PROTO((rtx, int, int));
58 static void gen_insn PROTO((rtx));
59 static void gen_expand PROTO((rtx));
60 static void gen_split PROTO((rtx));
61 static void gen_peephole PROTO((rtx));
63 /* RECOG_P will be non-zero if this pattern was seen in a context where it will
64 be used to recognize, rather than just generate an insn.
66 NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
67 of a SET whose destination is not (pc). */
70 walk_insn_part (part, recog_p, non_pc_set_src)
76 register RTX_CODE code;
77 register char *format_ptr;
82 code = GET_CODE (part);
86 clobbers_seen_this_insn++;
90 if (XINT (part, 0) > max_recog_operands)
91 max_recog_operands = XINT (part, 0);
92 if (XSTR (part, 2) && *XSTR (part, 2))
93 register_constraint_flag = 1;
98 ++dup_operands_seen_this_insn;
102 if (XINT (part, 0) > max_recog_operands)
103 max_recog_operands = XINT (part, 0);
104 /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
109 if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
114 ++dup_operands_seen_this_insn;
115 if (XINT (part, 0) > max_recog_operands)
116 max_recog_operands = XINT (part, 0);
126 have_lo_sum_flag = 1;
130 walk_insn_part (SET_DEST (part), 0, recog_p);
131 walk_insn_part (SET_SRC (part), recog_p,
132 GET_CODE (SET_DEST (part)) != PC);
136 /* Only consider this machine as having a conditional move if the
137 two arms of the IF_THEN_ELSE are both MATCH_OPERAND. Otherwise,
138 we have some specific IF_THEN_ELSE construct (like the doz
139 instruction on the RS/6000) that can't be used in the general
140 context we want it for. */
142 if (recog_p && non_pc_set_src
143 && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
144 && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
148 case REG: case CONST_INT: case SYMBOL_REF:
156 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
158 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
159 switch (*format_ptr++)
163 walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
166 if (XVEC (part, i) != NULL)
167 for (j = 0; j < XVECLEN (part, i); j++)
168 walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
179 /* Walk the insn pattern to gather the #define's status. */
180 clobbers_seen_this_insn = 0;
181 dup_operands_seen_this_insn = 0;
182 if (XVEC (insn, 1) != 0)
183 for (i = 0; i < XVECLEN (insn, 1); i++)
184 walk_insn_part (XVECEXP (insn, 1, i), 1, 0);
186 if (clobbers_seen_this_insn > max_clobbers_per_insn)
187 max_clobbers_per_insn = clobbers_seen_this_insn;
188 if (dup_operands_seen_this_insn > max_dup_operands)
189 max_dup_operands = dup_operands_seen_this_insn;
192 /* Similar but scan a define_expand. */
200 /* Walk the insn pattern to gather the #define's status. */
202 /* Note that we don't bother recording the number of MATCH_DUPs
203 that occur in a gen_expand, because only reload cares about that. */
204 if (XVEC (insn, 1) != 0)
205 for (i = 0; i < XVECLEN (insn, 1); i++)
207 /* Compute the maximum SETs and CLOBBERS
208 in any one of the sub-insns;
209 don't sum across all of them. */
210 clobbers_seen_this_insn = 0;
212 walk_insn_part (XVECEXP (insn, 1, i), 0, 0);
214 if (clobbers_seen_this_insn > max_clobbers_per_insn)
215 max_clobbers_per_insn = clobbers_seen_this_insn;
219 /* Similar but scan a define_split. */
227 /* Look through the patterns that are matched
228 to compute the maximum operand number. */
229 for (i = 0; i < XVECLEN (split, 0); i++)
230 walk_insn_part (XVECEXP (split, 0, i), 1, 0);
231 /* Look at the number of insns this insn could split into. */
232 if (XVECLEN (split, 2) > max_insns_per_split)
233 max_insns_per_split = XVECLEN (split, 2);
242 /* Look through the patterns that are matched
243 to compute the maximum operand number. */
244 for (i = 0; i < XVECLEN (peep, 0); i++)
245 walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
252 register char *val = (char *) malloc (size);
255 fatal ("virtual memory exhausted");
265 char *result = (char *) realloc (ptr, size);
267 fatal ("virtual memory exhausted");
272 fatal VPROTO ((char *format, ...))
274 #ifndef ANSI_PROTOTYPES
279 VA_START (ap, format);
281 #ifndef ANSI_PROTOTYPES
282 format = va_arg (ap, char *);
285 fprintf (stderr, "genconfig: ");
286 vfprintf (stderr, format, ap);
288 fprintf (stderr, "\n");
289 exit (FATAL_EXIT_CODE);
292 /* More 'friendly' abort that prints the line and file.
293 config.h can #define abort fancy_abort if you like that sort of thing. */
298 fatal ("Internal gcc abort.");
310 obstack_init (rtl_obstack);
313 fatal ("No input file name.");
315 infile = fopen (argv[1], "r");
319 exit (FATAL_EXIT_CODE);
324 printf ("/* Generated automatically by the program `genconfig'\n\
325 from the machine description file `md'. */\n\n");
327 /* Allow at least 10 operands for the sake of asm constructs. */
328 max_recog_operands = 9; /* We will add 1 later. */
329 max_dup_operands = 1;
331 /* Read the machine description. */
335 c = read_skip_spaces (infile);
340 desc = read_rtx (infile);
341 if (GET_CODE (desc) == DEFINE_INSN)
343 if (GET_CODE (desc) == DEFINE_EXPAND)
345 if (GET_CODE (desc) == DEFINE_SPLIT)
347 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
351 printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
353 printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
355 /* This is conditionally defined, in case the user writes code which emits
356 more splits than we can readily see (and knows s/he does it). */
357 printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
358 max_insns_per_split);
360 if (register_constraint_flag)
361 printf ("#define REGISTER_CONSTRAINTS\n");
364 printf ("#define HAVE_cc0\n");
367 printf ("#define HAVE_conditional_move\n");
369 if (have_lo_sum_flag)
370 printf ("#define HAVE_lo_sum\n");
373 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);