1 | /* Process machine description and calculate constant conditions. |
2 | Copyright (C) 2001-2023 Free Software Foundation, Inc. |
3 | |
4 | This file is part of GCC. |
5 | |
6 | GCC is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by |
8 | the Free Software Foundation; either version 3, or (at your option) |
9 | any later version. |
10 | |
11 | GCC is distributed in the hope that it will be useful, |
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 |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ |
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 | |
28 | #include "bconfig.h" |
29 | #include "system.h" |
30 | #include "coretypes.h" |
31 | #include "tm.h" |
32 | #include "rtl.h" |
33 | #include "errors.h" |
34 | #include "read-md.h" |
35 | #include "gensupport.h" |
36 | |
37 | /* so we can include except.h in the generated file. */ |
38 | static int saw_eh_return; |
39 | |
40 | static void write_header (void); |
41 | static void write_conditions (void); |
42 | static int write_one_condition (void **, void *); |
43 | |
44 | /* Generate the header for insn-conditions.c. */ |
45 | |
46 | static void |
47 | (void) |
48 | { |
49 | puts (s: "\ |
50 | /* Generated automatically by the program `genconditions' from the target\n\ |
51 | machine description file. */\n\ |
52 | \n\ |
53 | #define IN_TARGET_CODE 1\n\ |
54 | #include \"bconfig.h\"\n\ |
55 | #define INCLUDE_STRING\n\ |
56 | #include \"system.h\"\n\ |
57 | \n\ |
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\ |
63 | /* Do not allow checking to confuse the issue. */\n\ |
64 | #undef CHECKING_P\n\ |
65 | #define CHECKING_P 0\n\ |
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\ |
70 | #undef ENABLE_GC_ALWAYS_COLLECT\n\ |
71 | #define USE_ENUM_MODES\n\ |
72 | \n\ |
73 | #include \"coretypes.h\"\n\ |
74 | #include \"tm.h\"\n\ |
75 | #include \"insn-constants.h\"\n\ |
76 | #include \"rtl.h\"\n\ |
77 | #include \"memmodel.h\"\n\ |
78 | #include \"tm_p.h\"\n\ |
79 | #include \"hard-reg-set.h\"\n\ |
80 | #include \"function.h\"\n\ |
81 | #include \"emit-rtl.h\"\n\ |
82 | \n\ |
83 | /* Fake - insn-config.h doesn't exist yet. */\n\ |
84 | #define MAX_RECOG_OPERANDS 10\n\ |
85 | #define MAX_DUP_OPERANDS 10\n\ |
86 | #define MAX_INSNS_PER_SPLIT 5\n\ |
87 | \n\ |
88 | #include \"regs.h\"\n\ |
89 | #include \"recog.h\"\n\ |
90 | #include \"output.h\"\n\ |
91 | #include \"flags.h\"\n\ |
92 | #include \"hard-reg-set.h\"\n\ |
93 | #include \"predict.h\"\n\ |
94 | #include \"basic-block.h\"\n\ |
95 | #include \"bitmap.h\"\n\ |
96 | #include \"df.h\"\n\ |
97 | #include \"resource.h\"\n\ |
98 | #include \"diagnostic-core.h\"\n\ |
99 | #include \"reload.h\"\n\ |
100 | #include \"tm-constrs.h\"\n" ); |
101 | |
102 | if (saw_eh_return) |
103 | puts (s: "#define HAVE_eh_return 1" ); |
104 | puts (s: "#include \"except.h\"\n" ); |
105 | |
106 | puts (s: "\ |
107 | /* Dummy external declarations. */\n\ |
108 | extern rtx_insn *insn;\n\ |
109 | extern rtx ins1;\n\ |
110 | extern rtx operands[];\n\ |
111 | \n\ |
112 | #endif /* gcc >= 3.0.1 */\n" ); |
113 | } |
114 | |
115 | /* Write out one entry in the conditions table, using the data pointed |
116 | to by SLOT. Each entry looks like this: |
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) }, */ |
122 | |
123 | static int |
124 | write_one_condition (void **slot, void * ARG_UNUSED (dummy)) |
125 | { |
126 | const struct c_test *test = *(const struct c_test *const *) slot; |
127 | const char *p; |
128 | |
129 | rtx_reader_ptr->print_md_ptr_loc (ptr: test->expr); |
130 | fputs (" { \"" , stdout); |
131 | for (p = test->expr; *p; p++) |
132 | { |
133 | switch (*p) |
134 | { |
135 | case '\n': fputs ("\\n\\" , stdout); break; |
136 | case '\\': |
137 | case '\"': putchar ('\\'); break; |
138 | default: break; |
139 | } |
140 | putchar (*p); |
141 | } |
142 | |
143 | fputs ("\",\n __builtin_constant_p " , stdout); |
144 | rtx_reader_ptr->print_c_condition (cond: test->expr); |
145 | fputs ("\n ? (int) " , stdout); |
146 | rtx_reader_ptr->print_c_condition (cond: test->expr); |
147 | fputs ("\n : -1 },\n" , stdout); |
148 | return 1; |
149 | } |
150 | |
151 | /* Write out the complete conditions table, its size, and a flag |
152 | indicating that gensupport.cc can now do insn elision. */ |
153 | static void |
154 | write_conditions (void) |
155 | { |
156 | puts (s: "\ |
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\ |
163 | };\n\ |
164 | \n\ |
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\ |
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\ |
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\ |
172 | \n\ |
173 | #if GCC_VERSION >= 3001\n\ |
174 | static const struct c_test insn_conditions[] = {\n" ); |
175 | |
176 | traverse_c_tests (write_one_condition, 0); |
177 | |
178 | puts (s: " { nullptr, -1 }\n};\n#endif /* gcc >= 3.0.1 */\n" ); |
179 | } |
180 | |
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 | { |
188 | puts (s: "int\n" |
189 | "main(void)\n" |
190 | "{\n" |
191 | " unsigned int i;\n" |
192 | " const char *p;\n" |
193 | " puts (\"(define_conditions [\");\n" |
194 | "#if GCC_VERSION >= 3001\n" |
195 | " for (i = 0; i < ARRAY_SIZE (insn_conditions) - 1; 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" |
209 | " }\n" |
210 | "#endif /* gcc >= 3.0.1 */\n" |
211 | " puts (\"])\");\n" |
212 | " fflush (stdout);\n" |
213 | "return ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE;\n" |
214 | "}" ); |
215 | } |
216 | |
217 | int |
218 | main (int argc, const char **argv) |
219 | { |
220 | progname = "genconditions" ; |
221 | |
222 | if (!init_rtx_reader_args (argc, argv)) |
223 | return (FATAL_EXIT_CODE); |
224 | |
225 | /* Read the machine description. */ |
226 | md_rtx_info info; |
227 | while (read_md_rtx (&info)) |
228 | { |
229 | rtx def = info.def; |
230 | add_c_test (get_c_test (def), -1); |
231 | switch (GET_CODE (def)) |
232 | { |
233 | case DEFINE_INSN: |
234 | case DEFINE_EXPAND: |
235 | /* except.h needs to know whether there is an eh_return |
236 | pattern in the machine description. */ |
237 | if (!strcmp (XSTR (def, 0), s2: "eh_return" )) |
238 | saw_eh_return = 1; |
239 | break; |
240 | |
241 | default: |
242 | break; |
243 | } |
244 | } |
245 | |
246 | write_header (); |
247 | write_conditions (); |
248 | write_writer (); |
249 | |
250 | fflush (stdout); |
251 | return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE); |
252 | } |
253 | |