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b70bd542 | 1 | /* Process machine description and calculate constant conditions. |
fbd26352 | 2 | Copyright (C) 2001-2019 Free Software Foundation, Inc. |
b70bd542 | 3 | |
5a8b6e6a | 4 | This file is part of GCC. |
b70bd542 | 5 | |
5a8b6e6a | 6 | GCC is free software; you can redistribute it and/or modify |
b70bd542 | 7 | it under the terms of the GNU General Public License as published by |
8c4c00c1 | 8 | the Free Software Foundation; either version 3, or (at your option) |
b70bd542 | 9 | any later version. |
10 | ||
5a8b6e6a | 11 | GCC is distributed in the hope that it will be useful, |
b70bd542 | 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
8c4c00c1 | 17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
b70bd542 | 19 | |
20 | /* In a machine description, all of the insn patterns - define_insn, | |
21 | define_expand, define_split, define_peephole, define_peephole2 - | |
22 | contain an optional C expression which makes the final decision | |
23 | about whether or not this pattern is usable. That expression may | |
24 | turn out to be always false when the compiler is built. If it is, | |
25 | most of the programs that generate code from the machine | |
26 | description can simply ignore the entire pattern. */ | |
27 | ||
805e22b2 | 28 | #include "bconfig.h" |
b70bd542 | 29 | #include "system.h" |
805e22b2 | 30 | #include "coretypes.h" |
31 | #include "tm.h" | |
b70bd542 | 32 | #include "rtl.h" |
33 | #include "errors.h" | |
960ebfe7 | 34 | #include "read-md.h" |
b70bd542 | 35 | #include "gensupport.h" |
36 | ||
21dda4ee | 37 | /* so we can include except.h in the generated file. */ |
b70bd542 | 38 | static int saw_eh_return; |
39 | ||
1a97be37 | 40 | static void write_header (void); |
41 | static void write_conditions (void); | |
42 | static int write_one_condition (void **, void *); | |
b70bd542 | 43 | |
b70bd542 | 44 | /* Generate the header for insn-conditions.c. */ |
45 | ||
46 | static void | |
1a97be37 | 47 | write_header (void) |
b70bd542 | 48 | { |
49 | puts ("\ | |
50 | /* Generated automatically by the program `genconditions' from the target\n\ | |
51 | machine description file. */\n\ | |
52 | \n\ | |
785790dc | 53 | #define IN_TARGET_CODE 1\n\ |
805e22b2 | 54 | #include \"bconfig.h\"\n\ |
e1b9f860 | 55 | #define INCLUDE_STRING\n\ |
1d752508 | 56 | #include \"system.h\"\n\ |
57 | \n\ | |
32dea8e6 | 58 | /* It is necessary, but not entirely safe, to include the headers below\n\ |
59 | in a generator program. As a defensive measure, don't do so when the\n\ | |
60 | table isn't going to have anything in it. */\n\ | |
61 | #if GCC_VERSION >= 3001\n\ | |
62 | \n\ | |
b70bd542 | 63 | /* Do not allow checking to confuse the issue. */\n\ |
e138bdcb | 64 | #undef CHECKING_P\n\ |
65 | #define CHECKING_P 0\n\ | |
b70bd542 | 66 | #undef ENABLE_TREE_CHECKING\n\ |
67 | #undef ENABLE_RTL_CHECKING\n\ | |
68 | #undef ENABLE_RTL_FLAG_CHECKING\n\ | |
69 | #undef ENABLE_GC_CHECKING\n\ | |
1d752508 | 70 | #undef ENABLE_GC_ALWAYS_COLLECT\n\ |
fb398229 | 71 | #define USE_ENUM_MODES\n\ |
1d752508 | 72 | \n\ |
805e22b2 | 73 | #include \"coretypes.h\"\n\ |
74 | #include \"tm.h\"\n\ | |
32dea8e6 | 75 | #include \"insn-constants.h\"\n\ |
b70bd542 | 76 | #include \"rtl.h\"\n\ |
ad7b10a2 | 77 | #include \"memmodel.h\"\n\ |
b70bd542 | 78 | #include \"tm_p.h\"\n\ |
a3020f2f | 79 | #include \"hard-reg-set.h\"\n\ |
1d752508 | 80 | #include \"function.h\"\n\ |
73bde8df | 81 | #include \"emit-rtl.h\"\n\ |
1d752508 | 82 | \n\ |
b70bd542 | 83 | /* Fake - insn-config.h doesn't exist yet. */\n\ |
84 | #define MAX_RECOG_OPERANDS 10\n\ | |
85 | #define MAX_DUP_OPERANDS 10\n\ | |
1d752508 | 86 | #define MAX_INSNS_PER_SPLIT 5\n\ |
87 | \n\ | |
b70bd542 | 88 | #include \"regs.h\"\n\ |
89 | #include \"recog.h\"\n\ | |
b70bd542 | 90 | #include \"output.h\"\n\ |
91 | #include \"flags.h\"\n\ | |
92 | #include \"hard-reg-set.h\"\n\ | |
94ea8568 | 93 | #include \"predict.h\"\n\ |
94 | #include \"basic-block.h\"\n\ | |
9ef16211 | 95 | #include \"bitmap.h\"\n\ |
96 | #include \"df.h\"\n\ | |
b70bd542 | 97 | #include \"resource.h\"\n\ |
c18cb818 | 98 | #include \"diagnostic-core.h\"\n\ |
966eae04 | 99 | #include \"reload.h\"\n\ |
100 | #include \"tm-constrs.h\"\n"); | |
b70bd542 | 101 | |
102 | if (saw_eh_return) | |
103 | puts ("#define HAVE_eh_return 1"); | |
104 | puts ("#include \"except.h\"\n"); | |
105 | ||
106 | puts ("\ | |
107 | /* Dummy external declarations. */\n\ | |
bf59a32d | 108 | extern rtx_insn *insn;\n\ |
b70bd542 | 109 | extern rtx ins1;\n\ |
32dea8e6 | 110 | extern rtx operands[];\n\ |
111 | \n\ | |
112 | #endif /* gcc >= 3.0.1 */\n"); | |
b70bd542 | 113 | } |
114 | ||
115 | /* Write out one entry in the conditions table, using the data pointed | |
116 | to by SLOT. Each entry looks like this: | |
9e959634 | 117 | |
118 | { "! optimize_size && ! TARGET_READ_MODIFY_WRITE", | |
119 | __builtin_constant_p (! optimize_size && ! TARGET_READ_MODIFY_WRITE) | |
120 | ? (int) (! optimize_size && ! TARGET_READ_MODIFY_WRITE) | |
121 | : -1) }, */ | |
b70bd542 | 122 | |
123 | static int | |
9a03a746 | 124 | write_one_condition (void **slot, void * ARG_UNUSED (dummy)) |
b70bd542 | 125 | { |
126 | const struct c_test *test = * (const struct c_test **) slot; | |
127 | const char *p; | |
128 | ||
e1e9159b | 129 | rtx_reader_ptr->print_md_ptr_loc (test->expr); |
b70bd542 | 130 | fputs (" { \"", stdout); |
131 | for (p = test->expr; *p; p++) | |
132 | { | |
32dea8e6 | 133 | switch (*p) |
134 | { | |
135 | case '\n': fputs ("\\n\\", stdout); break; | |
136 | case '\\': | |
137 | case '\"': putchar ('\\'); break; | |
138 | default: break; | |
139 | } | |
140 | putchar (*p); | |
b70bd542 | 141 | } |
142 | ||
1d752508 | 143 | fputs ("\",\n __builtin_constant_p ", stdout); |
e1e9159b | 144 | rtx_reader_ptr->print_c_condition (test->expr); |
1d752508 | 145 | fputs ("\n ? (int) ", stdout); |
e1e9159b | 146 | rtx_reader_ptr->print_c_condition (test->expr); |
1d752508 | 147 | fputs ("\n : -1 },\n", stdout); |
b70bd542 | 148 | return 1; |
149 | } | |
150 | ||
151 | /* Write out the complete conditions table, its size, and a flag | |
152 | indicating that gensupport.c can now do insn elision. */ | |
153 | static void | |
1a97be37 | 154 | write_conditions (void) |
b70bd542 | 155 | { |
32dea8e6 | 156 | puts ("\ |
157 | /* Structure definition duplicated from gensupport.h rather than\n\ | |
158 | drag in that file and its dependencies. */\n\ | |
159 | struct c_test\n\ | |
160 | {\n\ | |
161 | const char *expr;\n\ | |
162 | int value;\n\ | |
1d752508 | 163 | };\n\ |
164 | \n\ | |
b70bd542 | 165 | /* This table lists each condition found in the machine description.\n\ |
166 | Each condition is mapped to its truth value (0 or 1), or -1 if that\n\ | |
32dea8e6 | 167 | cannot be calculated at compile time.\n\ |
168 | If we don't have __builtin_constant_p, or it's not acceptable in array\n\ | |
af908c02 | 169 | initializers, fall back to assuming that all conditions potentially\n\ |
170 | vary at run time. It works in 3.0.1 and later; 3.0 only when not\n\ | |
171 | optimizing. */\n\ | |
32dea8e6 | 172 | \n\ |
1c1a6437 | 173 | #if GCC_VERSION >= 3001\n\ |
174 | static const struct c_test insn_conditions[] = {\n"); | |
b70bd542 | 175 | |
af908c02 | 176 | traverse_c_tests (write_one_condition, 0); |
b70bd542 | 177 | |
1c1a6437 | 178 | puts ("\n};\n#endif /* gcc >= 3.0.1 */\n"); |
af908c02 | 179 | } |
b70bd542 | 180 | |
af908c02 | 181 | /* Emit code which will convert the C-format table to a |
182 | (define_conditions) form, which the MD reader can understand. | |
183 | The result will be added to the set of files scanned by | |
184 | 'downstream' generators. */ | |
185 | static void | |
186 | write_writer (void) | |
187 | { | |
32dea8e6 | 188 | puts ("int\n" |
189 | "main(void)\n" | |
190 | "{\n" | |
191 | " unsigned int i;\n" | |
192 | " const char *p;\n" | |
193 | " puts (\"(define_conditions [\");\n" | |
1c1a6437 | 194 | "#if GCC_VERSION >= 3001\n" |
32dea8e6 | 195 | " for (i = 0; i < ARRAY_SIZE (insn_conditions); i++)\n" |
196 | " {\n" | |
197 | " printf (\" (%d \\\"\", insn_conditions[i].value);\n" | |
198 | " for (p = insn_conditions[i].expr; *p; p++)\n" | |
199 | " {\n" | |
200 | " switch (*p)\n" | |
201 | " {\n" | |
202 | " case '\\\\':\n" | |
203 | " case '\\\"': putchar ('\\\\'); break;\n" | |
204 | " default: break;\n" | |
205 | " }\n" | |
206 | " putchar (*p);\n" | |
207 | " }\n" | |
208 | " puts (\"\\\")\");\n" | |
1d752508 | 209 | " }\n" |
1c1a6437 | 210 | "#endif /* gcc >= 3.0.1 */\n" |
1d752508 | 211 | " puts (\"])\");\n" |
32dea8e6 | 212 | " fflush (stdout);\n" |
213 | "return ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE;\n" | |
214 | "}"); | |
b70bd542 | 215 | } |
216 | ||
217 | int | |
16570c04 | 218 | main (int argc, const char **argv) |
b70bd542 | 219 | { |
b70bd542 | 220 | progname = "genconditions"; |
221 | ||
77ba95d0 | 222 | if (!init_rtx_reader_args (argc, argv)) |
b70bd542 | 223 | return (FATAL_EXIT_CODE); |
224 | ||
b70bd542 | 225 | /* Read the machine description. */ |
c04601c1 | 226 | md_rtx_info info; |
227 | while (read_md_rtx (&info)) | |
b70bd542 | 228 | { |
c04601c1 | 229 | rtx def = info.def; |
7c1b1064 | 230 | add_c_test (get_c_test (def), -1); |
c04601c1 | 231 | switch (GET_CODE (def)) |
b70bd542 | 232 | { |
b70bd542 | 233 | case DEFINE_INSN: |
234 | case DEFINE_EXPAND: | |
b70bd542 | 235 | /* except.h needs to know whether there is an eh_return |
236 | pattern in the machine description. */ | |
c04601c1 | 237 | if (!strcmp (XSTR (def, 0), "eh_return")) |
b70bd542 | 238 | saw_eh_return = 1; |
239 | break; | |
240 | ||
c04601c1 | 241 | default: |
b70bd542 | 242 | break; |
243 | } | |
244 | } | |
245 | ||
246 | write_header (); | |
247 | write_conditions (); | |
af908c02 | 248 | write_writer (); |
b70bd542 | 249 | |
250 | fflush (stdout); | |
251 | return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE); | |
252 | } |