1/* Generate from machine description: 2 - some #define configuration flags. 3 Copyright (C) 1987, 1991, 1997, 1998, 1999 Free Software Foundation, Inc. 4 5This file is part of GNU CC. 6 7GNU CC is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2, or (at your option) 10any later version. 11 12GNU CC is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GNU CC; see the file COPYING. If not, write to 19the Free Software Foundation, 59 Temple Place - Suite 330, 20Boston, MA 02111-1307, USA. */ 21 22 23#include "hconfig.h" 24#include "system.h" 25#include "rtl.h" 26#include "obstack.h" 27 28static struct obstack obstack; 29struct obstack *rtl_obstack = &obstack; 30 31#define obstack_chunk_alloc xmalloc 32#define obstack_chunk_free free 33 34/* Define this so we can link with print-rtl.o to get debug_rtx function. */ 35char **insn_name_ptr = 0; 36 37/* flags to determine output of machine description dependent #define's. */ 38static int max_recog_operands; /* Largest operand number seen. */ 39static int max_dup_operands; /* Largest number of match_dup in any insn. */ 40static int max_clobbers_per_insn; 41static int register_constraint_flag; 42static int have_cc0_flag; 43static int have_cmove_flag; 44static int have_lo_sum_flag; 45 46/* Maximum number of insns seen in a split. */ 47static int max_insns_per_split = 1; 48 49static int clobbers_seen_this_insn; 50static int dup_operands_seen_this_insn; 51 52void fatal PVPROTO ((const char *, ...)) 53 ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN; 54void fancy_abort PROTO((void)) ATTRIBUTE_NORETURN; 55 56static void walk_insn_part PROTO((rtx, int, int)); 57static void gen_insn PROTO((rtx)); 58static void gen_expand PROTO((rtx)); 59static void gen_split PROTO((rtx)); 60static void gen_peephole PROTO((rtx)); 61 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. 64 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). */ 67 68static void 69walk_insn_part (part, recog_p, non_pc_set_src) 70 rtx part; 71 int recog_p; 72 int non_pc_set_src; 73{ 74 register int i, j; 75 register RTX_CODE code; 76 register char *format_ptr; 77 78 if (part == 0) 79 return; 80 81 code = GET_CODE (part); 82 switch (code) 83 { 84 case CLOBBER: 85 clobbers_seen_this_insn++; 86 break; 87 88 case MATCH_OPERAND: 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; 93 return; 94 95 case MATCH_OP_DUP: 96 case MATCH_PAR_DUP: 97 ++dup_operands_seen_this_insn; 98 case MATCH_SCRATCH: 99 case MATCH_PARALLEL: 100 case MATCH_OPERATOR: 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 104 MATCH_PARALLEL. */ 105 break; 106 107 case LABEL_REF: 108 if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND) 109 break; 110 return; 111 112 case MATCH_DUP: 113 ++dup_operands_seen_this_insn; 114 if (XINT (part, 0) > max_recog_operands) 115 max_recog_operands = XINT (part, 0); 116 return; 117 118 case CC0: 119 if (recog_p) 120 have_cc0_flag = 1; 121 return; 122 123 case LO_SUM: 124 if (recog_p) 125 have_lo_sum_flag = 1; 126 return; 127 128 case SET: 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); 132 return; 133 134 case IF_THEN_ELSE: 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. */ 140 141 if (recog_p && non_pc_set_src 142 && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND 143 && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND) 144 have_cmove_flag = 1; 145 break; 146 147 case REG: case CONST_INT: case SYMBOL_REF: 148 case PC: 149 return; 150 151 default: 152 break; 153 } 154 155 format_ptr = GET_RTX_FORMAT (GET_CODE (part)); 156 157 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++) 158 switch (*format_ptr++) 159 { 160 case 'e': 161 case 'u': 162 walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src); 163 break; 164 case 'E': 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); 168 break; 169 } 170} 171 172static void 173gen_insn (insn) 174 rtx insn; 175{ 176 int i; 177 178 /* 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); 184 185 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; 189} 190 191/* Similar but scan a define_expand. */ 192 193static void 194gen_expand (insn) 195 rtx insn; 196{ 197 int i; 198 199 /* Walk the insn pattern to gather the #define's status. */ 200 201 /* 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++) 205 { 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; 210 211 walk_insn_part (XVECEXP (insn, 1, i), 0, 0); 212 213 if (clobbers_seen_this_insn > max_clobbers_per_insn) 214 max_clobbers_per_insn = clobbers_seen_this_insn; 215 } 216} 217 218/* Similar but scan a define_split. */ 219 220static void 221gen_split (split) 222 rtx split; 223{ 224 int i; 225 226 /* 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); 233} 234 235static void 236gen_peephole (peep) 237 rtx peep; 238{ 239 int i; 240 241 /* 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); 245} 246 247PTR 248xmalloc (size) 249 size_t size; 250{ 251 register PTR val = (PTR) malloc (size); 252 253 if (val == 0) 254 fatal ("virtual memory exhausted"); 255 256 return val; 257} 258 259PTR 260xrealloc (old, size) 261 PTR old; 262 size_t size; 263{ 264 register PTR ptr; 265 if (old) 266 ptr = (PTR) realloc (old, size); 267 else 268 ptr = (PTR) malloc (size); 269 if (!ptr) 270 fatal ("virtual memory exhausted"); 271 return ptr; 272} 273 274void 275fatal VPROTO ((const char *format, ...)) 276{ 277#ifndef ANSI_PROTOTYPES 278 const char *format; 279#endif 280 va_list ap; 281 282 VA_START (ap, format); 283 284#ifndef ANSI_PROTOTYPES 285 format = va_arg (ap, const char *); 286#endif 287 288 fprintf (stderr, "genconfig: "); 289 vfprintf (stderr, format, ap); 290 va_end (ap); 291 fprintf (stderr, "\n"); 292 exit (FATAL_EXIT_CODE); 293} 294 295/* More 'friendly' abort that prints the line and file. 296 config.h can #define abort fancy_abort if you like that sort of thing. */ 297 298void 299fancy_abort () 300{ 301 fatal ("Internal gcc abort."); 302} 303 304int 305main (argc, argv) 306 int argc; 307 char **argv; 308{ 309 rtx desc; 310 FILE *infile; 311 register int c; 312 313 obstack_init (rtl_obstack); 314 315 if (argc <= 1) 316 fatal ("No input file name."); 317 318 infile = fopen (argv[1], "r"); 319 if (infile == 0) 320 { 321 perror (argv[1]); 322 exit (FATAL_EXIT_CODE); 323 } 324 325 init_rtl (); 326 327 printf ("/* Generated automatically by the program `genconfig'\n\ 328from the machine description file `md'. */\n\n"); 329 330 /* 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; 333 334 /* Read the machine description. */ 335 336 while (1) 337 { 338 c = read_skip_spaces (infile); 339 if (c == EOF) 340 break; 341 ungetc (c, infile); 342 343 desc = read_rtx (infile); 344 if (GET_CODE (desc) == DEFINE_INSN) 345 gen_insn (desc); 346 if (GET_CODE (desc) == DEFINE_EXPAND) 347 gen_expand (desc); 348 if (GET_CODE (desc) == DEFINE_SPLIT) 349 gen_split (desc); 350 if (GET_CODE (desc) == DEFINE_PEEPHOLE) 351 gen_peephole (desc); 352 } 353 354 printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1); 355 356 printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands); 357 358 /* 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); 362 363 if (register_constraint_flag) 364 printf ("#define REGISTER_CONSTRAINTS\n"); 365 366 if (have_cc0_flag) 367 printf ("#define HAVE_cc0\n"); 368 369 if (have_cmove_flag) 370 printf ("#define HAVE_conditional_move\n"); 371 372 if (have_lo_sum_flag) 373 printf ("#define HAVE_lo_sum\n"); 374 375 fflush (stdout); 376 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE); 377 /* NOTREACHED */ 378 return 0; 379} 380