1 /* Generate from machine description:
2 - some #define configuration flags.
3 Copyright (C) 1987, 1991, 1997, 1998, 1999 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 void fatal PVPROTO ((const char *, ...))
53 ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
54 void fancy_abort PROTO((void)) ATTRIBUTE_NORETURN;
56 static void walk_insn_part PROTO((rtx, int, int));
57 static void gen_insn PROTO((rtx));
58 static void gen_expand PROTO((rtx));
59 static void gen_split PROTO((rtx));
60 static void gen_peephole PROTO((rtx));
62 /* RECOG_P will be non-zero if this pattern was seen in a context where it will
63 be used to recognize, rather than just generate an insn.
65 NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
66 of a SET whose destination is not (pc). */
69 walk_insn_part (part, recog_p, non_pc_set_src)
75 register RTX_CODE code;
76 register char *format_ptr;
81 code = GET_CODE (part);
85 clobbers_seen_this_insn++;
89 if (XINT (part, 0) > max_recog_operands)
90 max_recog_operands = XINT (part, 0);
91 if (XSTR (part, 2) && *XSTR (part, 2))
92 register_constraint_flag = 1;
97 ++dup_operands_seen_this_insn;
101 if (XINT (part, 0) > max_recog_operands)
102 max_recog_operands = XINT (part, 0);
103 /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
108 if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
113 ++dup_operands_seen_this_insn;
114 if (XINT (part, 0) > max_recog_operands)
115 max_recog_operands = XINT (part, 0);
125 have_lo_sum_flag = 1;
129 walk_insn_part (SET_DEST (part), 0, recog_p);
130 walk_insn_part (SET_SRC (part), recog_p,
131 GET_CODE (SET_DEST (part)) != PC);
135 /* Only consider this machine as having a conditional move if the
136 two arms of the IF_THEN_ELSE are both MATCH_OPERAND. Otherwise,
137 we have some specific IF_THEN_ELSE construct (like the doz
138 instruction on the RS/6000) that can't be used in the general
139 context we want it for. */
141 if (recog_p && non_pc_set_src
142 && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
143 && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
147 case REG: case CONST_INT: case SYMBOL_REF:
155 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
157 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
158 switch (*format_ptr++)
162 walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
165 if (XVEC (part, i) != NULL)
166 for (j = 0; j < XVECLEN (part, i); j++)
167 walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
178 /* Walk the insn pattern to gather the #define's status. */
179 clobbers_seen_this_insn = 0;
180 dup_operands_seen_this_insn = 0;
181 if (XVEC (insn, 1) != 0)
182 for (i = 0; i < XVECLEN (insn, 1); i++)
183 walk_insn_part (XVECEXP (insn, 1, i), 1, 0);
185 if (clobbers_seen_this_insn > max_clobbers_per_insn)
186 max_clobbers_per_insn = clobbers_seen_this_insn;
187 if (dup_operands_seen_this_insn > max_dup_operands)
188 max_dup_operands = dup_operands_seen_this_insn;
191 /* Similar but scan a define_expand. */
199 /* Walk the insn pattern to gather the #define's status. */
201 /* Note that we don't bother recording the number of MATCH_DUPs
202 that occur in a gen_expand, because only reload cares about that. */
203 if (XVEC (insn, 1) != 0)
204 for (i = 0; i < XVECLEN (insn, 1); i++)
206 /* Compute the maximum SETs and CLOBBERS
207 in any one of the sub-insns;
208 don't sum across all of them. */
209 clobbers_seen_this_insn = 0;
211 walk_insn_part (XVECEXP (insn, 1, i), 0, 0);
213 if (clobbers_seen_this_insn > max_clobbers_per_insn)
214 max_clobbers_per_insn = clobbers_seen_this_insn;
218 /* Similar but scan a define_split. */
226 /* Look through the patterns that are matched
227 to compute the maximum operand number. */
228 for (i = 0; i < XVECLEN (split, 0); i++)
229 walk_insn_part (XVECEXP (split, 0, i), 1, 0);
230 /* Look at the number of insns this insn could split into. */
231 if (XVECLEN (split, 2) > max_insns_per_split)
232 max_insns_per_split = XVECLEN (split, 2);
241 /* Look through the patterns that are matched
242 to compute the maximum operand number. */
243 for (i = 0; i < XVECLEN (peep, 0); i++)
244 walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
251 register PTR val = (PTR) malloc (size);
254 fatal ("virtual memory exhausted");
266 ptr = (PTR) realloc (old, size);
268 ptr = (PTR) malloc (size);
270 fatal ("virtual memory exhausted");
275 fatal VPROTO ((const char *format, ...))
277 #ifndef ANSI_PROTOTYPES
282 VA_START (ap, format);
284 #ifndef ANSI_PROTOTYPES
285 format = va_arg (ap, const char *);
288 fprintf (stderr, "genconfig: ");
289 vfprintf (stderr, format, ap);
291 fprintf (stderr, "\n");
292 exit (FATAL_EXIT_CODE);
295 /* More 'friendly' abort that prints the line and file.
296 config.h can #define abort fancy_abort if you like that sort of thing. */
301 fatal ("Internal gcc abort.");
313 obstack_init (rtl_obstack);
316 fatal ("No input file name.");
318 infile = fopen (argv[1], "r");
322 exit (FATAL_EXIT_CODE);
327 printf ("/* Generated automatically by the program `genconfig'\n\
328 from the machine description file `md'. */\n\n");
330 /* Allow at least 10 operands for the sake of asm constructs. */
331 max_recog_operands = 9; /* We will add 1 later. */
332 max_dup_operands = 1;
334 /* Read the machine description. */
338 c = read_skip_spaces (infile);
343 desc = read_rtx (infile);
344 if (GET_CODE (desc) == DEFINE_INSN)
346 if (GET_CODE (desc) == DEFINE_EXPAND)
348 if (GET_CODE (desc) == DEFINE_SPLIT)
350 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
354 printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
356 printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
358 /* This is conditionally defined, in case the user writes code which emits
359 more splits than we can readily see (and knows s/he does it). */
360 printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
361 max_insns_per_split);
363 if (register_constraint_flag)
364 printf ("#define REGISTER_CONSTRAINTS\n");
367 printf ("#define HAVE_cc0\n");
370 printf ("#define HAVE_conditional_move\n");
372 if (have_lo_sum_flag)
373 printf ("#define HAVE_lo_sum\n");
376 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);