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e440a328 | 1 | /* go-lang.c -- Go frontend gcc interface. |
3aea1f79 | 2 | Copyright (C) 2009-2014 Free Software Foundation, Inc. |
e440a328 | 3 | |
4 | This file is part of GCC. | |
5 | ||
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 3, or (at your option) any later | |
9 | version. | |
10 | ||
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. | |
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 | #include "config.h" | |
21 | #include "system.h" | |
22 | #include "ansidecl.h" | |
23 | #include "coretypes.h" | |
24 | #include "opts.h" | |
25 | #include "tree.h" | |
94ea8568 | 26 | #include "vec.h" |
27 | #include "hashtab.h" | |
28 | #include "hash-set.h" | |
29 | #include "machmode.h" | |
30 | #include "tm.h" | |
31 | #include "hard-reg-set.h" | |
32 | #include "input.h" | |
33 | #include "function.h" | |
bc61cadb | 34 | #include "gimple-expr.h" |
a8783bee | 35 | #include "gimplify.h" |
9ed99284 | 36 | #include "stor-layout.h" |
e440a328 | 37 | #include "toplev.h" |
38 | #include "debug.h" | |
39 | #include "options.h" | |
40 | #include "flags.h" | |
41 | #include "convert.h" | |
42 | #include "diagnostic.h" | |
43 | #include "langhooks.h" | |
44 | #include "langhooks-def.h" | |
e440a328 | 45 | #include "target.h" |
218e3e4e | 46 | #include "common/common-target.h" |
e440a328 | 47 | |
48 | #include <mpfr.h> | |
49 | ||
50 | #include "go-c.h" | |
51 | ||
52 | /* Language-dependent contents of a type. */ | |
53 | ||
54 | struct GTY(()) lang_type | |
55 | { | |
56 | char dummy; | |
57 | }; | |
58 | ||
59 | /* Language-dependent contents of a decl. */ | |
60 | ||
25a27413 | 61 | struct GTY(()) lang_decl |
e440a328 | 62 | { |
63 | char dummy; | |
64 | }; | |
65 | ||
66 | /* Language-dependent contents of an identifier. This must include a | |
67 | tree_identifier. */ | |
68 | ||
69 | struct GTY(()) lang_identifier | |
70 | { | |
71 | struct tree_identifier common; | |
72 | }; | |
73 | ||
74 | /* The resulting tree type. */ | |
75 | ||
76 | union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"), | |
9b88d08d | 77 | chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL"))) |
e440a328 | 78 | lang_tree_node |
79 | { | |
80 | union tree_node GTY((tag ("0"), | |
81 | desc ("tree_node_structure (&%h)"))) generic; | |
82 | struct lang_identifier GTY((tag ("1"))) identifier; | |
83 | }; | |
84 | ||
85 | /* We don't use language_function. */ | |
86 | ||
87 | struct GTY(()) language_function | |
88 | { | |
89 | int dummy; | |
90 | }; | |
91 | ||
2a2647e2 | 92 | /* Option information we need to pass to go_create_gogo. */ |
93 | ||
94 | static const char *go_pkgpath = NULL; | |
95 | static const char *go_prefix = NULL; | |
0b1e172c | 96 | static const char *go_relative_import_path = NULL; |
2a2647e2 | 97 | |
e440a328 | 98 | /* Language hooks. */ |
99 | ||
100 | static bool | |
101 | go_langhook_init (void) | |
102 | { | |
c38a75b7 | 103 | build_common_tree_nodes (false, false); |
e440a328 | 104 | |
e5287e21 | 105 | /* I don't know why this has to be done explicitly. */ |
106 | void_list_node = build_tree_list (NULL_TREE, void_type_node); | |
107 | ||
e440a328 | 108 | /* We must create the gogo IR after calling build_common_tree_nodes |
109 | (because Gogo::define_builtin_function_trees refers indirectly | |
110 | to, e.g., unsigned_char_type_node) but before calling | |
111 | build_common_builtin_nodes (because it calls, indirectly, | |
112 | go_type_for_size). */ | |
0b1e172c | 113 | go_create_gogo (INT_TYPE_SIZE, POINTER_SIZE, go_pkgpath, go_prefix, |
5c3f3470 | 114 | go_relative_import_path, go_check_divide_zero, |
115 | go_check_divide_overflow); | |
e440a328 | 116 | |
117 | build_common_builtin_nodes (); | |
118 | ||
e440a328 | 119 | /* The default precision for floating point numbers. This is used |
120 | for floating point constants with abstract type. This may | |
121 | eventually be controllable by a command line option. */ | |
f68344e7 | 122 | mpfr_set_default_prec (256); |
e440a328 | 123 | |
124 | /* Go uses exceptions. */ | |
125 | using_eh_for_cleanups (); | |
126 | ||
127 | return true; | |
128 | } | |
129 | ||
130 | /* The option mask. */ | |
131 | ||
132 | static unsigned int | |
133 | go_langhook_option_lang_mask (void) | |
134 | { | |
135 | return CL_Go; | |
136 | } | |
137 | ||
138 | /* Initialize the options structure. */ | |
139 | ||
140 | static void | |
141 | go_langhook_init_options_struct (struct gcc_options *opts) | |
142 | { | |
143 | /* Go says that signed overflow is precisely defined. */ | |
144 | opts->x_flag_wrapv = 1; | |
145 | ||
146 | /* We default to using strict aliasing, since Go pointers are safe. | |
147 | This is turned off for code that imports the "unsafe" package, | |
148 | because using unsafe.pointer violates C style aliasing | |
149 | requirements. */ | |
150 | opts->x_flag_strict_aliasing = 1; | |
151 | ||
152 | /* Default to avoiding range issues for complex multiply and | |
153 | divide. */ | |
154 | opts->x_flag_complex_method = 2; | |
155 | ||
156 | /* The builtin math functions should not set errno. */ | |
157 | opts->x_flag_errno_math = 0; | |
11a9e74f | 158 | opts->frontend_set_flag_errno_math = true; |
e440a328 | 159 | |
160 | /* We turn on stack splitting if we can. */ | |
218e3e4e | 161 | if (targetm_common.supports_split_stack (false, opts)) |
e440a328 | 162 | opts->x_flag_split_stack = 1; |
163 | ||
164 | /* Exceptions are used to handle recovering from panics. */ | |
165 | opts->x_flag_exceptions = 1; | |
166 | opts->x_flag_non_call_exceptions = 1; | |
167 | } | |
168 | ||
f1f41a6c | 169 | /* Infrastructure for a vector of char * pointers. */ |
b978ac2f | 170 | |
171 | typedef const char *go_char_p; | |
b978ac2f | 172 | |
173 | /* The list of directories to search after all the Go specific | |
174 | directories have been searched. */ | |
175 | ||
f1f41a6c | 176 | static vec<go_char_p> go_search_dirs; |
b978ac2f | 177 | |
e440a328 | 178 | /* Handle Go specific options. Return 0 if we didn't do anything. */ |
179 | ||
180 | static bool | |
181 | go_langhook_handle_option ( | |
182 | size_t scode, | |
183 | const char *arg, | |
184 | int value ATTRIBUTE_UNUSED, | |
185 | int kind ATTRIBUTE_UNUSED, | |
186 | location_t loc ATTRIBUTE_UNUSED, | |
187 | const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED) | |
188 | { | |
189 | enum opt_code code = (enum opt_code) scode; | |
190 | bool ret = true; | |
191 | ||
192 | switch (code) | |
193 | { | |
194 | case OPT_I: | |
e440a328 | 195 | go_add_search_path (arg); |
196 | break; | |
197 | ||
b978ac2f | 198 | case OPT_L: |
199 | /* A -L option is assumed to come from the compiler driver. | |
200 | This is a system directory. We search the following | |
201 | directories, if they exist, before this one: | |
202 | dir/go/VERSION | |
203 | dir/go/VERSION/MACHINE | |
204 | This is like include/c++. */ | |
205 | { | |
206 | static const char dir_separator_str[] = { DIR_SEPARATOR, 0 }; | |
207 | size_t len; | |
208 | char *p; | |
209 | struct stat st; | |
210 | ||
211 | len = strlen (arg); | |
212 | p = XALLOCAVEC (char, | |
213 | (len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION | |
214 | + sizeof DEFAULT_TARGET_MACHINE + 3)); | |
215 | strcpy (p, arg); | |
216 | if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1])) | |
217 | strcat (p, dir_separator_str); | |
218 | strcat (p, "go"); | |
219 | strcat (p, dir_separator_str); | |
220 | strcat (p, DEFAULT_TARGET_VERSION); | |
221 | if (stat (p, &st) == 0 && S_ISDIR (st.st_mode)) | |
222 | { | |
223 | go_add_search_path (p); | |
224 | strcat (p, dir_separator_str); | |
225 | strcat (p, DEFAULT_TARGET_MACHINE); | |
226 | if (stat (p, &st) == 0 && S_ISDIR (st.st_mode)) | |
227 | go_add_search_path (p); | |
228 | } | |
229 | ||
230 | /* Search ARG too, but only after we've searched to Go | |
231 | specific directories for all -L arguments. */ | |
f1f41a6c | 232 | go_search_dirs.safe_push (arg); |
b978ac2f | 233 | } |
234 | break; | |
235 | ||
e440a328 | 236 | case OPT_fgo_dump_: |
237 | ret = go_enable_dump (arg) ? true : false; | |
238 | break; | |
239 | ||
8b1c301d | 240 | case OPT_fgo_optimize_: |
241 | ret = go_enable_optimize (arg) ? true : false; | |
242 | break; | |
243 | ||
2a2647e2 | 244 | case OPT_fgo_pkgpath_: |
245 | go_pkgpath = arg; | |
246 | break; | |
247 | ||
e440a328 | 248 | case OPT_fgo_prefix_: |
2a2647e2 | 249 | go_prefix = arg; |
e440a328 | 250 | break; |
251 | ||
0b1e172c | 252 | case OPT_fgo_relative_import_path_: |
253 | go_relative_import_path = arg; | |
254 | break; | |
255 | ||
e440a328 | 256 | default: |
257 | /* Just return 1 to indicate that the option is valid. */ | |
258 | break; | |
259 | } | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
264 | /* Run after parsing options. */ | |
265 | ||
266 | static bool | |
267 | go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED) | |
268 | { | |
b978ac2f | 269 | unsigned int ix; |
270 | const char *dir; | |
271 | ||
e440a328 | 272 | gcc_assert (num_in_fnames > 0); |
273 | ||
f1f41a6c | 274 | FOR_EACH_VEC_ELT (go_search_dirs, ix, dir) |
b978ac2f | 275 | go_add_search_path (dir); |
f1f41a6c | 276 | go_search_dirs.release (); |
b978ac2f | 277 | |
e440a328 | 278 | if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT) |
279 | flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD; | |
280 | ||
3f724473 | 281 | /* Tail call optimizations can confuse uses of runtime.Callers. */ |
282 | if (!global_options_set.x_flag_optimize_sibling_calls) | |
283 | global_options.x_flag_optimize_sibling_calls = 0; | |
284 | ||
e440a328 | 285 | /* Returning false means that the backend should be used. */ |
286 | return false; | |
287 | } | |
288 | ||
289 | static void | |
290 | go_langhook_parse_file (void) | |
291 | { | |
292 | go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only, | |
293 | go_require_return_statement); | |
294 | } | |
295 | ||
296 | static tree | |
297 | go_langhook_type_for_size (unsigned int bits, int unsignedp) | |
298 | { | |
6d1e1dd9 | 299 | tree type; |
300 | if (unsignedp) | |
301 | { | |
302 | if (bits == INT_TYPE_SIZE) | |
303 | type = unsigned_type_node; | |
304 | else if (bits == CHAR_TYPE_SIZE) | |
305 | type = unsigned_char_type_node; | |
306 | else if (bits == SHORT_TYPE_SIZE) | |
307 | type = short_unsigned_type_node; | |
308 | else if (bits == LONG_TYPE_SIZE) | |
309 | type = long_unsigned_type_node; | |
310 | else if (bits == LONG_LONG_TYPE_SIZE) | |
311 | type = long_long_unsigned_type_node; | |
312 | else | |
313 | type = make_unsigned_type(bits); | |
314 | } | |
315 | else | |
316 | { | |
317 | if (bits == INT_TYPE_SIZE) | |
318 | type = integer_type_node; | |
319 | else if (bits == CHAR_TYPE_SIZE) | |
320 | type = signed_char_type_node; | |
321 | else if (bits == SHORT_TYPE_SIZE) | |
322 | type = short_integer_type_node; | |
323 | else if (bits == LONG_TYPE_SIZE) | |
324 | type = long_integer_type_node; | |
325 | else if (bits == LONG_LONG_TYPE_SIZE) | |
326 | type = long_long_integer_type_node; | |
327 | else | |
328 | type = make_signed_type(bits); | |
329 | } | |
330 | return type; | |
e440a328 | 331 | } |
332 | ||
333 | static tree | |
3754d046 | 334 | go_langhook_type_for_mode (machine_mode mode, int unsignedp) |
e440a328 | 335 | { |
d74c2623 | 336 | tree type; |
1c919d2d | 337 | /* Go has no vector types. Build them here. FIXME: It does not |
338 | make sense for the middle-end to ask the frontend for a type | |
339 | which the frontend does not support. However, at least for now | |
340 | it is required. See PR 46805. */ | |
341 | if (VECTOR_MODE_P (mode)) | |
342 | { | |
343 | tree inner; | |
344 | ||
345 | inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp); | |
346 | if (inner != NULL_TREE) | |
347 | return build_vector_type_for_mode (inner, mode); | |
348 | return NULL_TREE; | |
349 | } | |
350 | ||
6d1e1dd9 | 351 | // FIXME: This static_cast should be in machmode.h. |
352 | enum mode_class mc = static_cast<enum mode_class>(GET_MODE_CLASS(mode)); | |
353 | if (mc == MODE_INT) | |
354 | return go_langhook_type_for_size(GET_MODE_BITSIZE(mode), unsignedp); | |
355 | else if (mc == MODE_FLOAT) | |
356 | { | |
357 | switch (GET_MODE_BITSIZE (mode)) | |
358 | { | |
359 | case 32: | |
360 | return float_type_node; | |
361 | case 64: | |
362 | return double_type_node; | |
363 | default: | |
364 | // We have to check for long double in order to support | |
365 | // i386 excess precision. | |
366 | if (mode == TYPE_MODE(long_double_type_node)) | |
367 | return long_double_type_node; | |
368 | } | |
369 | } | |
370 | else if (mc == MODE_COMPLEX_FLOAT) | |
371 | { | |
372 | switch (GET_MODE_BITSIZE (mode)) | |
373 | { | |
374 | case 64: | |
375 | return complex_float_type_node; | |
376 | case 128: | |
377 | return complex_double_type_node; | |
378 | default: | |
379 | // We have to check for long double in order to support | |
380 | // i386 excess precision. | |
381 | if (mode == TYPE_MODE(complex_long_double_type_node)) | |
382 | return complex_long_double_type_node; | |
383 | } | |
384 | } | |
d74c2623 | 385 | |
386 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
387 | /* The middle-end and some backends rely on TImode being supported | |
388 | for 64-bit HWI. */ | |
389 | if (mode == TImode) | |
390 | { | |
391 | type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode), | |
392 | unsignedp); | |
393 | if (type && TYPE_MODE (type) == TImode) | |
394 | return type; | |
395 | } | |
396 | #endif | |
397 | return NULL_TREE; | |
e440a328 | 398 | } |
399 | ||
400 | /* Record a builtin function. We just ignore builtin functions. */ | |
401 | ||
402 | static tree | |
403 | go_langhook_builtin_function (tree decl) | |
404 | { | |
405 | return decl; | |
406 | } | |
407 | ||
1d2bb655 | 408 | /* Return true if we are in the global binding level. */ |
409 | ||
410 | static bool | |
e440a328 | 411 | go_langhook_global_bindings_p (void) |
412 | { | |
1d2bb655 | 413 | return current_function_decl == NULL_TREE; |
e440a328 | 414 | } |
415 | ||
416 | /* Push a declaration into the current binding level. We can't | |
417 | usefully implement this since we don't want to convert from tree | |
418 | back to one of our internal data structures. I think the only way | |
419 | this is used is to record a decl which is to be returned by | |
420 | getdecls, and we could implement it for that purpose if | |
421 | necessary. */ | |
422 | ||
423 | static tree | |
424 | go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED) | |
425 | { | |
426 | gcc_unreachable (); | |
427 | } | |
428 | ||
429 | /* This hook is used to get the current list of declarations as trees. | |
430 | We don't support that; instead we use the write_globals hook. This | |
431 | can't simply crash because it is called by -gstabs. */ | |
432 | ||
433 | static tree | |
434 | go_langhook_getdecls (void) | |
435 | { | |
436 | return NULL; | |
437 | } | |
438 | ||
439 | /* Write out globals. */ | |
440 | ||
441 | static void | |
442 | go_langhook_write_globals (void) | |
443 | { | |
444 | go_write_globals (); | |
445 | } | |
446 | ||
447 | /* Go specific gimplification. We need to gimplify | |
448 | CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle | |
449 | it. */ | |
450 | ||
451 | static int | |
452 | go_langhook_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p) | |
453 | { | |
454 | if (TREE_CODE (*expr_p) == CALL_EXPR | |
455 | && CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE) | |
456 | gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p, | |
457 | is_gimple_val, fb_rvalue); | |
458 | return GS_UNHANDLED; | |
459 | } | |
460 | ||
461 | /* Return a decl for the exception personality function. The function | |
462 | itself is implemented in libgo/runtime/go-unwind.c. */ | |
463 | ||
464 | static tree | |
465 | go_langhook_eh_personality (void) | |
466 | { | |
467 | static tree personality_decl; | |
468 | if (personality_decl == NULL_TREE) | |
469 | { | |
470 | personality_decl = build_personality_function ("gccgo"); | |
471 | go_preserve_from_gc (personality_decl); | |
472 | } | |
473 | return personality_decl; | |
474 | } | |
475 | ||
476 | /* Functions called directly by the generic backend. */ | |
477 | ||
478 | tree | |
479 | convert (tree type, tree expr) | |
480 | { | |
481 | if (type == error_mark_node | |
482 | || expr == error_mark_node | |
483 | || TREE_TYPE (expr) == error_mark_node) | |
484 | return error_mark_node; | |
485 | ||
486 | if (type == TREE_TYPE (expr)) | |
487 | return expr; | |
488 | ||
489 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr))) | |
490 | return fold_convert (type, expr); | |
491 | ||
492 | switch (TREE_CODE (type)) | |
493 | { | |
494 | case VOID_TYPE: | |
495 | case BOOLEAN_TYPE: | |
496 | return fold_convert (type, expr); | |
497 | case INTEGER_TYPE: | |
498 | return fold (convert_to_integer (type, expr)); | |
499 | case POINTER_TYPE: | |
500 | return fold (convert_to_pointer (type, expr)); | |
501 | case REAL_TYPE: | |
502 | return fold (convert_to_real (type, expr)); | |
503 | case COMPLEX_TYPE: | |
504 | return fold (convert_to_complex (type, expr)); | |
505 | default: | |
506 | break; | |
507 | } | |
508 | ||
509 | gcc_unreachable (); | |
510 | } | |
511 | ||
512 | /* FIXME: This is a hack to preserve trees that we create from the | |
513 | garbage collector. */ | |
514 | ||
515 | static GTY(()) tree go_gc_root; | |
516 | ||
517 | void | |
518 | go_preserve_from_gc (tree t) | |
519 | { | |
520 | go_gc_root = tree_cons (NULL_TREE, t, go_gc_root); | |
521 | } | |
522 | ||
523 | /* Convert an identifier for use in an error message. */ | |
524 | ||
525 | const char * | |
526 | go_localize_identifier (const char *ident) | |
527 | { | |
528 | return identifier_to_locale (ident); | |
529 | } | |
530 | ||
531 | #undef LANG_HOOKS_NAME | |
532 | #undef LANG_HOOKS_INIT | |
533 | #undef LANG_HOOKS_OPTION_LANG_MASK | |
534 | #undef LANG_HOOKS_INIT_OPTIONS_STRUCT | |
535 | #undef LANG_HOOKS_HANDLE_OPTION | |
536 | #undef LANG_HOOKS_POST_OPTIONS | |
537 | #undef LANG_HOOKS_PARSE_FILE | |
538 | #undef LANG_HOOKS_TYPE_FOR_MODE | |
539 | #undef LANG_HOOKS_TYPE_FOR_SIZE | |
540 | #undef LANG_HOOKS_BUILTIN_FUNCTION | |
541 | #undef LANG_HOOKS_GLOBAL_BINDINGS_P | |
542 | #undef LANG_HOOKS_PUSHDECL | |
543 | #undef LANG_HOOKS_GETDECLS | |
544 | #undef LANG_HOOKS_WRITE_GLOBALS | |
545 | #undef LANG_HOOKS_GIMPLIFY_EXPR | |
546 | #undef LANG_HOOKS_EH_PERSONALITY | |
547 | ||
548 | #define LANG_HOOKS_NAME "GNU Go" | |
549 | #define LANG_HOOKS_INIT go_langhook_init | |
550 | #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask | |
551 | #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct | |
552 | #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option | |
553 | #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options | |
554 | #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file | |
555 | #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode | |
556 | #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size | |
557 | #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function | |
558 | #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p | |
559 | #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl | |
560 | #define LANG_HOOKS_GETDECLS go_langhook_getdecls | |
561 | #define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals | |
562 | #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr | |
563 | #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality | |
564 | ||
565 | struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER; | |
566 | ||
567 | #include "gt-go-go-lang.h" | |
568 | #include "gtype-go.h" |