1/* Generate code to allocate RTL structures.
2 Copyright (C) 1997-2017 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3. If not see
18<http://www.gnu.org/licenses/>. */
19
20
21#include "bconfig.h"
22#include "system.h"
23
24struct rtx_definition
25{
26 const char *const enumname, *const name, *const format;
27};
28
29/* rtl.def needs CONST_DOUBLE_FORMAT, but we don't care what
30 CONST_DOUBLE_FORMAT is because we're not going to be generating
31 anything for CONST_DOUBLE anyway. */
32#define CONST_DOUBLE_FORMAT ""
33
34#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #ENUM, NAME, FORMAT },
35
36static const struct rtx_definition defs[] =
37{
38#include "rtl.def" /* rtl expressions are documented here */
39};
40#define NUM_RTX_CODE ARRAY_SIZE (defs)
41
42static const char *formats[NUM_RTX_CODE];
43
44/* Decode a format letter into a C type string. */
45
46static const char *
47type_from_format (int c)
48{
49 switch (c)
50 {
51 case 'i':
52 return "int ";
53
54 case 'w':
55 return "HOST_WIDE_INT ";
56
57 case 's':
58 return "const char *";
59
60 case 'e': case 'u':
61 return "rtx ";
62
63 case 'E':
64 return "rtvec ";
65 case 't':
66 return "tree ";
67 case 'B':
68 return "basic_block ";
69 default:
70 gcc_unreachable ();
71 }
72}
73
74/* Decode a format letter into the proper accessor function. */
75
76static const char *
77accessor_from_format (int c)
78{
79 switch (c)
80 {
81 case 'i':
82 return "XINT";
83
84 case 'w':
85 return "XWINT";
86
87 case 's':
88 return "XSTR";
89
90 case 'e': case 'u':
91 return "XEXP";
92
93 case 'E':
94 return "XVEC";
95
96 case 't':
97 return "XTREE";
98
99 case 'B':
100 return "XBBDEF";
101
102 default:
103 gcc_unreachable ();
104 }
105}
106
107/* Return nonzero if we should ignore FMT, an RTL format, when making
108 the list of formats we write routines to create. */
109
110static int
111special_format (const char *fmt)
112{
113 return (strchr (fmt, '*') != 0
114 || strchr (fmt, 'V') != 0
115 || strchr (fmt, 'S') != 0
116 || strchr (fmt, 'n') != 0
117 || strchr (fmt, 'r') != 0);
118}
119
120/* Return true if CODE always has VOIDmode. */
121
122static inline bool
123always_void_p (int idx)
124{
125 return strcmp (defs[idx].enumname, "SET") == 0;
126}
127
128/* Return nonzero if the RTL code given by index IDX is one that we should
129 generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO
130 is a wrapper in emit-rtl.c). */
131
132static int
133special_rtx (int idx)
134{
135 return (strcmp (defs[idx].enumname, "EXPR_LIST") == 0
136 || strcmp (defs[idx].enumname, "INSN_LIST") == 0
137 || strcmp (defs[idx].enumname, "INSN") == 0
138 || strcmp (defs[idx].enumname, "CONST_INT") == 0
139 || strcmp (defs[idx].enumname, "REG") == 0
140 || strcmp (defs[idx].enumname, "SUBREG") == 0
141 || strcmp (defs[idx].enumname, "MEM") == 0
142 || strcmp (defs[idx].enumname, "PC") == 0
143 || strcmp (defs[idx].enumname, "CC0") == 0
144 || strcmp (defs[idx].enumname, "RETURN") == 0
145 || strcmp (defs[idx].enumname, "SIMPLE_RETURN") == 0
146 || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0);
147}
148
149/* Return nonzero if the RTL code given by index IDX is one that we should
150 generate no macro for at all (because gen_rtx_FOO is never used or
151 cannot have the obvious interface). */
152
153static int
154excluded_rtx (int idx)
155{
156 return (strcmp (defs[idx].enumname, "VAR_LOCATION") == 0
157 || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
158 || strcmp (defs[idx].enumname, "CONST_WIDE_INT") == 0
159 || strcmp (defs[idx].enumname, "CONST_FIXED") == 0);
160}
161
162/* Place a list of all format specifiers we use into the array FORMAT. */
163
164static void
165find_formats (void)
166{
167 unsigned int i;
168
169 for (i = 0; i < NUM_RTX_CODE; i++)
170 {
171 const char **f;
172
173 if (special_format (defs[i].format))
174 continue;
175
176 for (f = formats; *f; f++)
177 if (! strcmp (*f, defs[i].format))
178 break;
179
180 if (*f == 0)
181 *f = defs[i].format;
182 }
183}
184
185
186/* Generate macros to generate RTL of code IDX using the functions we
187 write. */
188
189static void
190genmacro (int idx)
191{
192 const char *p;
193 const char *sep = "";
194 int i;
195
196 /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
197 gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */
198
199 if (excluded_rtx (idx))
200 /* Don't define a macro for this code. */
201 return;
202
203 bool has_mode_p = !always_void_p (idx);
204 printf ("#define gen_rtx_%s%s(",
205 special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
206 if (has_mode_p)
207 {
208 printf ("MODE");
209 sep = ", ";
210 }
211
212 for (p = defs[idx].format, i = 0; *p != 0; p++)
213 if (*p != '0')
214 {
215 printf ("%sARG%d", sep, i++);
216 sep = ", ";
217 }
218
219 printf (") \\\n gen_rtx_fmt_%s (%s, %s",
220 defs[idx].format, defs[idx].enumname,
221 has_mode_p ? "(MODE)" : "VOIDmode");
222
223 for (p = defs[idx].format, i = 0; *p != 0; p++)
224 if (*p != '0')
225 printf (", (ARG%d)", i++);
226
227 puts (")");
228}
229
230/* Generate the code for the function to generate RTL whose
231 format is FORMAT. */
232
233static void
234gendef (const char *format)
235{
236 const char *p;
237 int i, j;
238
239 /* Start by writing the definition of the function name and the types
240 of the arguments. */
241
242 printf ("static inline rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, machine_mode mode", format);
243 for (p = format, i = 0; *p != 0; p++)
244 if (*p != '0')
245 printf (",\n\t%sarg%d", type_from_format (*p), i++);
246
247 puts (" MEM_STAT_DECL)");
248
249 /* Now write out the body of the function itself, which allocates
250 the memory and initializes it. */
251 puts ("{");
252 puts (" rtx rt;");
253 puts (" rt = rtx_alloc (code PASS_MEM_STAT);\n");
254
255 puts (" PUT_MODE_RAW (rt, mode);");
256
257 for (p = format, i = j = 0; *p ; ++p, ++i)
258 if (*p != '0')
259 printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
260 else
261 printf (" X0EXP (rt, %d) = NULL_RTX;\n", i);
262
263 puts ("\n return rt;\n}\n");
264 printf ("#define gen_rtx_fmt_%s(c, m", format);
265 for (p = format, i = 0; *p != 0; p++)
266 if (*p != '0')
267 printf (", p%i",i++);
268 printf (")\\\n gen_rtx_fmt_%s_stat (c, m", format);
269 for (p = format, i = 0; *p != 0; p++)
270 if (*p != '0')
271 printf (", p%i",i++);
272 printf (" MEM_STAT_INFO)\n\n");
273}
274
275/* Generate the documentation header for files we write. */
276
277static void
278genlegend (void)
279{
280 puts ("/* Generated automatically by gengenrtl from rtl.def. */\n");
281}
282
283/* Generate the text of the header file we make, genrtl.h. */
284
285static void
286genheader (void)
287{
288 unsigned int i;
289 const char **fmt;
290
291 puts ("#ifndef GCC_GENRTL_H");
292 puts ("#define GCC_GENRTL_H\n");
293 puts ("#include \"statistics.h\"\n");
294
295 for (fmt = formats; *fmt; ++fmt)
296 gendef (*fmt);
297
298 putchar ('\n');
299
300 for (i = 0; i < NUM_RTX_CODE; i++)
301 if (! special_format (defs[i].format))
302 genmacro (i);
303
304 puts ("\n#endif /* GCC_GENRTL_H */");
305}
306
307/* This is the main program. */
308
309int
310main (void)
311{
312 find_formats ();
313 genlegend ();
314
315 genheader ();
316
317 if (ferror (stdout) || fflush (stdout) || fclose (stdout))
318 return FATAL_EXIT_CODE;
319
320 return SUCCESS_EXIT_CODE;
321}
322