Daily bump.
[official-gcc.git] / gcc / gengenrtl.c
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1 /* Generate code to allocate RTL structures.
2 Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 2, or (at your option) any later
9 version.
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING. If not, write to the Free
18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
19 02111-1307, USA. */
22 #include "hconfig.h"
23 #include "system.h"
25 #define NO_GENRTL_H
26 #include "rtl.h"
27 #undef abort
29 #include "real.h"
31 /* Calculate the format for CONST_DOUBLE. This depends on the relative
32 widths of HOST_WIDE_INT and REAL_VALUE_TYPE.
34 We need to go out to e0wwwww, since REAL_ARITHMETIC assumes 16-bits
35 per element in REAL_VALUE_TYPE.
37 This is duplicated in rtl.c.
39 A number of places assume that there are always at least two 'w'
40 slots in a CONST_DOUBLE, so we provide them even if one would suffice. */
42 #ifdef REAL_ARITHMETIC
43 # if MAX_LONG_DOUBLE_TYPE_SIZE == 96
44 # define REAL_WIDTH \
45 (11*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
46 # else
47 # if MAX_LONG_DOUBLE_TYPE_SIZE == 128
48 # define REAL_WIDTH \
49 (19*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
50 # else
51 # if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
52 # define REAL_WIDTH \
53 (7*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
54 # endif
55 # endif
56 # endif
57 #endif /* REAL_ARITHMETIC */
59 #ifndef REAL_WIDTH
60 # if HOST_BITS_PER_WIDE_INT*2 >= MAX_LONG_DOUBLE_TYPE_SIZE
61 # define REAL_WIDTH 2
62 # else
63 # if HOST_BITS_PER_WIDE_INT*3 >= MAX_LONG_DOUBLE_TYPE_SIZE
64 # define REAL_WIDTH 3
65 # else
66 # if HOST_BITS_PER_WIDE_INT*4 >= MAX_LONG_DOUBLE_TYPE_SIZE
67 # define REAL_WIDTH 4
68 # endif
69 # endif
70 # endif
71 #endif /* REAL_WIDTH */
73 #if REAL_WIDTH == 1
74 # define CONST_DOUBLE_FORMAT "0ww"
75 #else
76 # if REAL_WIDTH == 2
77 # define CONST_DOUBLE_FORMAT "0ww"
78 # else
79 # if REAL_WIDTH == 3
80 # define CONST_DOUBLE_FORMAT "0www"
81 # else
82 # if REAL_WIDTH == 4
83 # define CONST_DOUBLE_FORMAT "0wwww"
84 # else
85 # if REAL_WIDTH == 5
86 # define CONST_DOUBLE_FORMAT "0wwwww"
87 # else
88 # define CONST_DOUBLE_FORMAT /* nothing - will cause syntax error */
89 # endif
90 # endif
91 # endif
92 # endif
93 #endif
96 struct rtx_definition
98 const char *const enumname, *const name, *const format;
101 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { STRINGX(ENUM), NAME, FORMAT },
103 static const struct rtx_definition defs[] =
105 #include "rtl.def" /* rtl expressions are documented here */
108 static const char *formats[NUM_RTX_CODE];
110 static const char *type_from_format PARAMS ((int));
111 static const char *accessor_from_format PARAMS ((int));
112 static int special_format PARAMS ((const char *));
113 static int special_rtx PARAMS ((int));
114 static void find_formats PARAMS ((void));
115 static void gendecl PARAMS ((const char *));
116 static void genmacro PARAMS ((int));
117 static void gendef PARAMS ((const char *));
118 static void genlegend PARAMS ((void));
119 static void genheader PARAMS ((void));
120 static void gencode PARAMS ((void));
122 /* Decode a format letter into a C type string. */
124 static const char *
125 type_from_format (c)
126 int c;
128 switch (c)
130 case 'i':
131 return "int ";
133 case 'w':
134 return "HOST_WIDE_INT ";
136 case 's':
137 return "const char *";
139 case 'e': case 'u':
140 return "rtx ";
142 case 'E':
143 return "rtvec ";
144 case 'b':
145 return "struct bitmap_head_def *"; /* bitmap - typedef not available */
146 case 't':
147 return "union tree_node *"; /* tree - typedef not available */
148 default:
149 abort ();
153 /* Decode a format letter into the proper accessor function. */
155 static const char *
156 accessor_from_format (c)
157 int c;
159 switch (c)
161 case 'i':
162 return "XINT";
164 case 'w':
165 return "XWINT";
167 case 's':
168 return "XSTR";
170 case 'e': case 'u':
171 return "XEXP";
173 case 'E':
174 return "XVEC";
176 case 'b':
177 return "XBITMAP";
179 case 't':
180 return "XTREE";
182 default:
183 abort ();
187 /* Return nonzero if we should ignore FMT, an RTL format, when making
188 the list of formats we write routines to create. */
190 static int
191 special_format (fmt)
192 const char *fmt;
194 return (strchr (fmt, '*') != 0
195 || strchr (fmt, 'V') != 0
196 || strchr (fmt, 'S') != 0
197 || strchr (fmt, 'n') != 0);
200 /* Return nonzero if the RTL code given by index IDX is one that we should not
201 generate a gen_RTX_FOO function foo (because that function is present
202 elsewhere in the compiler). */
204 static int
205 special_rtx (idx)
206 int idx;
208 return (strcmp (defs[idx].enumname, "CONST_INT") == 0
209 || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
210 || strcmp (defs[idx].enumname, "REG") == 0
211 || strcmp (defs[idx].enumname, "SUBREG") == 0
212 || strcmp (defs[idx].enumname, "MEM") == 0);
215 /* Place a list of all format specifiers we use into the array FORMAT. */
217 static void
218 find_formats ()
220 int i;
222 for (i = 0; i < NUM_RTX_CODE; i++)
224 const char **f;
226 if (special_format (defs[i].format))
227 continue;
229 for (f = formats; *f; f++)
230 if (! strcmp (*f, defs[i].format))
231 break;
233 if (*f == 0)
234 *f = defs[i].format;
238 /* Write the declarations for the routine to allocate RTL with FORMAT. */
240 static void
241 gendecl (format)
242 const char *format;
244 const char *p;
245 int i, pos;
247 printf ("extern rtx gen_rtx_fmt_%s\tPARAMS ((RTX_CODE, ", format);
248 printf ("enum machine_mode mode");
250 /* Write each parameter that is needed and start a new line when the line
251 would overflow. */
252 for (p = format, i = 0, pos = 75; *p != 0; p++)
253 if (*p != '0')
255 int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9);
257 printf (",");
258 if (pos + ourlen > 76)
259 printf ("\n\t\t\t\t "), pos = 39;
261 printf (" %sarg%d", type_from_format (*p), i++);
262 pos += ourlen;
265 printf ("));\n");
268 /* Generate macros to generate RTL of code IDX using the functions we
269 write. */
271 static void
272 genmacro (idx)
273 int idx;
275 const char *p;
276 int i;
278 /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
279 gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */
281 printf ("#define gen_rtx_%s%s(MODE",
282 special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
284 for (p = defs[idx].format, i = 0; *p != 0; p++)
285 if (*p != '0')
286 printf (", ARG%d", i++);
288 printf (") \\\n gen_rtx_fmt_%s (%s, (MODE)",
289 defs[idx].format, defs[idx].enumname);
291 for (p = defs[idx].format, i = 0; *p != 0; p++)
292 if (*p != '0')
293 printf (", (ARG%d)", i++);
295 puts (")");
298 /* Generate the code for the function to generate RTL whose
299 format is FORMAT. */
301 static void
302 gendef (format)
303 const char *format;
305 const char *p;
306 int i, j;
308 /* Start by writing the definition of the function name and the types
309 of the arguments. */
311 printf ("rtx\ngen_rtx_fmt_%s (code, mode", format);
312 for (p = format, i = 0; *p != 0; p++)
313 if (*p != '0')
314 printf (", arg%d", i++);
316 puts (")\n RTX_CODE code;\n enum machine_mode mode;");
317 for (p = format, i = 0; *p != 0; p++)
318 if (*p != '0')
319 printf (" %sarg%d;\n", type_from_format (*p), i++);
321 /* Now write out the body of the function itself, which allocates
322 the memory and initializes it. */
323 puts ("{");
324 puts (" rtx rt;");
325 printf (" rt = ggc_alloc_rtx (%d);\n", (int) strlen (format));
327 puts (" memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));\n");
328 puts (" PUT_CODE (rt, code);");
329 puts (" PUT_MODE (rt, mode);");
331 for (p = format, i = j = 0; *p ; ++p, ++i)
332 if (*p != '0')
333 printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
334 else
335 printf (" X0EXP (rt, %d) = NULL_RTX;\n", i);
337 puts ("\n return rt;\n}\n");
340 /* Generate the documentation header for files we write. */
342 static void
343 genlegend ()
345 puts ("/* Generated automatically by gengenrtl from rtl.def. */\n");
348 /* Generate the text of the header file we make, genrtl.h. */
350 static void
351 genheader ()
353 int i;
354 const char **fmt;
356 puts ("#ifndef GCC_GENRTL_H");
357 puts ("#define GCC_GENRTL_H\n");
359 for (fmt = formats; *fmt; ++fmt)
360 gendecl (*fmt);
362 putchar ('\n');
364 for (i = 0; i < NUM_RTX_CODE; i++)
365 if (! special_format (defs[i].format))
366 genmacro (i);
368 puts ("\n#endif /* GCC_GENRTL_H */");
371 /* Generate the text of the code file we write, genrtl.c. */
373 static void
374 gencode ()
376 const char **fmt;
378 puts ("#include \"config.h\"");
379 puts ("#include \"system.h\"");
380 puts ("#include \"obstack.h\"");
381 puts ("#include \"rtl.h\"");
382 puts ("#include \"ggc.h\"\n");
383 puts ("extern struct obstack *rtl_obstack;\n");
384 puts ("#define obstack_alloc_rtx(n) \\");
385 puts (" ((rtx) obstack_alloc (rtl_obstack, \\");
386 puts (" sizeof (struct rtx_def) \\");
387 puts (" + ((n) - 1) * sizeof (rtunion)))\n");
389 for (fmt = formats; *fmt != 0; fmt++)
390 gendef (*fmt);
393 /* This is the main program. We accept only one argument, "-h", which
394 says we are writing the genrtl.h file. Otherwise we are writing the
395 genrtl.c file. */
396 extern int main PARAMS ((int, char **));
399 main (argc, argv)
400 int argc;
401 char **argv;
403 find_formats ();
404 genlegend ();
406 if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')
407 genheader ();
408 else
409 gencode ();
411 if (ferror (stdout) || fflush (stdout) || fclose (stdout))
412 return FATAL_EXIT_CODE;
414 return SUCCESS_EXIT_CODE;