1 /* Generate code to allocate RTL structures. 2 Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2007, 2010 3 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it under 8 the terms of the GNU General Public License as published by the Free 9 Software Foundation; either version 3, or (at your option) any later 10 version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 20 21 22 #include "bconfig.h" 23 #include "system.h" 24 25 struct rtx_definition 26 { 27 const char *const enumname, *const name, *const format; 28 }; 29 30 /* rtl.def needs CONST_DOUBLE_FORMAT, but we don't care what 31 CONST_DOUBLE_FORMAT is because we're not going to be generating 32 anything for CONST_DOUBLE anyway. */ 33 #define CONST_DOUBLE_FORMAT "" 34 35 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #ENUM, NAME, FORMAT }, 36 37 static const struct rtx_definition defs[] = 38 { 39 #include "rtl.def" /* rtl expressions are documented here */ 40 }; 41 #define NUM_RTX_CODE ARRAY_SIZE(defs) 42 43 static const char *formats[NUM_RTX_CODE]; 44 45 /* Decode a format letter into a C type string. */ 46 47 static const char * 48 type_from_format (int c) 49 { 50 switch (c) 51 { 52 case 'i': 53 return "int "; 54 55 case 'w': 56 return "HOST_WIDE_INT "; 57 58 case 's': 59 return "const char *"; 60 61 case 'e': case 'u': 62 return "rtx "; 63 64 case 'E': 65 return "rtvec "; 66 case 't': 67 return "union tree_node *"; /* tree - typedef not available */ 68 case 'B': 69 return "struct basic_block_def *"; /* basic block - typedef not available */ 70 default: 71 gcc_unreachable (); 72 } 73 } 74 75 /* Decode a format letter into the proper accessor function. */ 76 77 static const char * 78 accessor_from_format (int c) 79 { 80 switch (c) 81 { 82 case 'i': 83 return "XINT"; 84 85 case 'w': 86 return "XWINT"; 87 88 case 's': 89 return "XSTR"; 90 91 case 'e': case 'u': 92 return "XEXP"; 93 94 case 'E': 95 return "XVEC"; 96 97 case 't': 98 return "XTREE"; 99 100 case 'B': 101 return "XBBDEF"; 102 103 default: 104 gcc_unreachable (); 105 } 106 } 107 108 /* Return nonzero if we should ignore FMT, an RTL format, when making 109 the list of formats we write routines to create. */ 110 111 static int 112 special_format (const char *fmt) 113 { 114 return (strchr (fmt, '*') != 0 115 || strchr (fmt, 'V') != 0 116 || strchr (fmt, 'S') != 0 117 || strchr (fmt, 'n') != 0); 118 } 119 120 /* Return nonzero if the RTL code given by index IDX is one that we should 121 generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO 122 is a wrapper in emit-rtl.c). */ 123 124 static int 125 special_rtx (int idx) 126 { 127 return (strcmp (defs[idx].enumname, "CONST_INT") == 0 128 || strcmp (defs[idx].enumname, "REG") == 0 129 || strcmp (defs[idx].enumname, "SUBREG") == 0 130 || strcmp (defs[idx].enumname, "MEM") == 0 131 || strcmp (defs[idx].enumname, "PC") == 0 132 || strcmp (defs[idx].enumname, "CC0") == 0 133 || strcmp (defs[idx].enumname, "RETURN") == 0 134 || strcmp (defs[idx].enumname, "SIMPLE_RETURN") == 0 135 || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0); 136 } 137 138 /* Return nonzero if the RTL code given by index IDX is one that we should 139 generate no macro for at all (because gen_rtx_FOO is never used or 140 cannot have the obvious interface). */ 141 142 static int 143 excluded_rtx (int idx) 144 { 145 return ((strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0) 146 || (strcmp (defs[idx].enumname, "CONST_FIXED") == 0)); 147 } 148 149 /* Place a list of all format specifiers we use into the array FORMAT. */ 150 151 static void 152 find_formats (void) 153 { 154 unsigned int i; 155 156 for (i = 0; i < NUM_RTX_CODE; i++) 157 { 158 const char **f; 159 160 if (special_format (defs[i].format)) 161 continue; 162 163 for (f = formats; *f; f++) 164 if (! strcmp (*f, defs[i].format)) 165 break; 166 167 if (*f == 0) 168 *f = defs[i].format; 169 } 170 } 171 172 173 /* Generate macros to generate RTL of code IDX using the functions we 174 write. */ 175 176 static void 177 genmacro (int idx) 178 { 179 const char *p; 180 int i; 181 182 /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to 183 gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */ 184 185 if (excluded_rtx (idx)) 186 /* Don't define a macro for this code. */ 187 return; 188 189 printf ("#define gen_rtx_%s%s(MODE", 190 special_rtx (idx) ? "raw_" : "", defs[idx].enumname); 191 192 for (p = defs[idx].format, i = 0; *p != 0; p++) 193 if (*p != '0') 194 printf (", ARG%d", i++); 195 196 printf (") \\\n gen_rtx_fmt_%s (%s, (MODE)", 197 defs[idx].format, defs[idx].enumname); 198 199 for (p = defs[idx].format, i = 0; *p != 0; p++) 200 if (*p != '0') 201 printf (", (ARG%d)", i++); 202 203 puts (")"); 204 } 205 206 /* Generate the code for the function to generate RTL whose 207 format is FORMAT. */ 208 209 static void 210 gendef (const char *format) 211 { 212 const char *p; 213 int i, j; 214 215 /* Start by writing the definition of the function name and the types 216 of the arguments. */ 217 218 printf ("static inline rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, enum machine_mode mode", format); 219 for (p = format, i = 0; *p != 0; p++) 220 if (*p != '0') 221 printf (",\n\t%sarg%d", type_from_format (*p), i++); 222 223 puts (" MEM_STAT_DECL)"); 224 225 /* Now write out the body of the function itself, which allocates 226 the memory and initializes it. */ 227 puts ("{"); 228 puts (" rtx rt;"); 229 puts (" rt = rtx_alloc_stat (code PASS_MEM_STAT);\n"); 230 231 puts (" PUT_MODE (rt, mode);"); 232 233 for (p = format, i = j = 0; *p ; ++p, ++i) 234 if (*p != '0') 235 printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++); 236 else 237 printf (" X0EXP (rt, %d) = NULL_RTX;\n", i); 238 239 puts ("\n return rt;\n}\n"); 240 printf ("#define gen_rtx_fmt_%s(c, m", format); 241 for (p = format, i = 0; *p != 0; p++) 242 if (*p != '0') 243 printf (", p%i",i++); 244 printf (")\\\n gen_rtx_fmt_%s_stat (c, m", format); 245 for (p = format, i = 0; *p != 0; p++) 246 if (*p != '0') 247 printf (", p%i",i++); 248 printf (" MEM_STAT_INFO)\n\n"); 249 } 250 251 /* Generate the documentation header for files we write. */ 252 253 static void 254 genlegend (void) 255 { 256 puts ("/* Generated automatically by gengenrtl from rtl.def. */\n"); 257 } 258 259 /* Generate the text of the header file we make, genrtl.h. */ 260 261 static void 262 genheader (void) 263 { 264 unsigned int i; 265 const char **fmt; 266 267 puts ("#ifndef GCC_GENRTL_H"); 268 puts ("#define GCC_GENRTL_H\n"); 269 puts ("#include \"statistics.h\"\n"); 270 271 for (fmt = formats; *fmt; ++fmt) 272 gendef (*fmt); 273 274 putchar ('\n'); 275 276 for (i = 0; i < NUM_RTX_CODE; i++) 277 if (! special_format (defs[i].format)) 278 genmacro (i); 279 280 puts ("\n#endif /* GCC_GENRTL_H */"); 281 } 282 283 /* This is the main program. */ 284 285 int 286 main (void) 287 { 288 find_formats (); 289 genlegend (); 290 291 genheader (); 292 293 if (ferror (stdout) || fflush (stdout) || fclose (stdout)) 294 return FATAL_EXIT_CODE; 295 296 return SUCCESS_EXIT_CODE; 297 } 298