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7a938933 | 1 | /* go-lang.c -- Go frontend gcc interface. |
c2b13bb6 | 2 | Copyright (C) 2009, 2010, 2011, 2012 Free Software Foundation, Inc. |
7a938933 ILT |
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" | |
26 | #include "gimple.h" | |
27 | #include "ggc.h" | |
28 | #include "toplev.h" | |
29 | #include "debug.h" | |
30 | #include "options.h" | |
31 | #include "flags.h" | |
32 | #include "convert.h" | |
33 | #include "diagnostic.h" | |
34 | #include "langhooks.h" | |
35 | #include "langhooks-def.h" | |
36 | #include "except.h" | |
37 | #include "target.h" | |
677f3fa8 | 38 | #include "common/common-target.h" |
7a938933 ILT |
39 | |
40 | #include <mpfr.h> | |
41 | ||
42 | #include "go-c.h" | |
43 | ||
44 | /* Language-dependent contents of a type. */ | |
45 | ||
46 | struct GTY(()) lang_type | |
47 | { | |
48 | char dummy; | |
49 | }; | |
50 | ||
51 | /* Language-dependent contents of a decl. */ | |
52 | ||
0229aee9 | 53 | struct GTY((variable_size)) lang_decl |
7a938933 ILT |
54 | { |
55 | char dummy; | |
56 | }; | |
57 | ||
58 | /* Language-dependent contents of an identifier. This must include a | |
59 | tree_identifier. */ | |
60 | ||
61 | struct GTY(()) lang_identifier | |
62 | { | |
63 | struct tree_identifier common; | |
64 | }; | |
65 | ||
66 | /* The resulting tree type. */ | |
67 | ||
68 | union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"), | |
81f653d6 | 69 | chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL"))) |
7a938933 ILT |
70 | lang_tree_node |
71 | { | |
72 | union tree_node GTY((tag ("0"), | |
73 | desc ("tree_node_structure (&%h)"))) generic; | |
74 | struct lang_identifier GTY((tag ("1"))) identifier; | |
75 | }; | |
76 | ||
77 | /* We don't use language_function. */ | |
78 | ||
79 | struct GTY(()) language_function | |
80 | { | |
81 | int dummy; | |
82 | }; | |
83 | ||
097b12fb ILT |
84 | /* Option information we need to pass to go_create_gogo. */ |
85 | ||
86 | static const char *go_pkgpath = NULL; | |
87 | static const char *go_prefix = NULL; | |
4e1866fe | 88 | static const char *go_relative_import_path = NULL; |
097b12fb | 89 | |
7a938933 ILT |
90 | /* Language hooks. */ |
91 | ||
92 | static bool | |
93 | go_langhook_init (void) | |
94 | { | |
1a072294 | 95 | build_common_tree_nodes (false, false); |
7a938933 | 96 | |
00733a00 ILT |
97 | /* I don't know why this has to be done explicitly. */ |
98 | void_list_node = build_tree_list (NULL_TREE, void_type_node); | |
99 | ||
7a938933 ILT |
100 | /* We must create the gogo IR after calling build_common_tree_nodes |
101 | (because Gogo::define_builtin_function_trees refers indirectly | |
102 | to, e.g., unsigned_char_type_node) but before calling | |
103 | build_common_builtin_nodes (because it calls, indirectly, | |
104 | go_type_for_size). */ | |
4e1866fe ILT |
105 | go_create_gogo (INT_TYPE_SIZE, POINTER_SIZE, go_pkgpath, go_prefix, |
106 | go_relative_import_path); | |
7a938933 ILT |
107 | |
108 | build_common_builtin_nodes (); | |
109 | ||
7a938933 ILT |
110 | /* The default precision for floating point numbers. This is used |
111 | for floating point constants with abstract type. This may | |
112 | eventually be controllable by a command line option. */ | |
1ec20ea1 | 113 | mpfr_set_default_prec (256); |
7a938933 ILT |
114 | |
115 | /* Go uses exceptions. */ | |
116 | using_eh_for_cleanups (); | |
117 | ||
118 | return true; | |
119 | } | |
120 | ||
121 | /* The option mask. */ | |
122 | ||
123 | static unsigned int | |
124 | go_langhook_option_lang_mask (void) | |
125 | { | |
126 | return CL_Go; | |
127 | } | |
128 | ||
129 | /* Initialize the options structure. */ | |
130 | ||
131 | static void | |
132 | go_langhook_init_options_struct (struct gcc_options *opts) | |
133 | { | |
134 | /* Go says that signed overflow is precisely defined. */ | |
135 | opts->x_flag_wrapv = 1; | |
136 | ||
137 | /* We default to using strict aliasing, since Go pointers are safe. | |
138 | This is turned off for code that imports the "unsafe" package, | |
139 | because using unsafe.pointer violates C style aliasing | |
140 | requirements. */ | |
141 | opts->x_flag_strict_aliasing = 1; | |
142 | ||
143 | /* Default to avoiding range issues for complex multiply and | |
144 | divide. */ | |
145 | opts->x_flag_complex_method = 2; | |
146 | ||
147 | /* The builtin math functions should not set errno. */ | |
148 | opts->x_flag_errno_math = 0; | |
9b548472 | 149 | opts->frontend_set_flag_errno_math = true; |
7a938933 ILT |
150 | |
151 | /* We turn on stack splitting if we can. */ | |
677f3fa8 | 152 | if (targetm_common.supports_split_stack (false, opts)) |
7a938933 ILT |
153 | opts->x_flag_split_stack = 1; |
154 | ||
155 | /* Exceptions are used to handle recovering from panics. */ | |
156 | opts->x_flag_exceptions = 1; | |
157 | opts->x_flag_non_call_exceptions = 1; | |
158 | } | |
159 | ||
ac819ba5 ILT |
160 | /* Infrastructure for a VEC of char * pointers. */ |
161 | ||
162 | typedef const char *go_char_p; | |
163 | DEF_VEC_P(go_char_p); | |
164 | DEF_VEC_ALLOC_P(go_char_p, heap); | |
165 | ||
166 | /* The list of directories to search after all the Go specific | |
167 | directories have been searched. */ | |
168 | ||
169 | static VEC(go_char_p, heap) *go_search_dirs; | |
170 | ||
7a938933 ILT |
171 | /* Handle Go specific options. Return 0 if we didn't do anything. */ |
172 | ||
173 | static bool | |
174 | go_langhook_handle_option ( | |
175 | size_t scode, | |
176 | const char *arg, | |
177 | int value ATTRIBUTE_UNUSED, | |
178 | int kind ATTRIBUTE_UNUSED, | |
179 | location_t loc ATTRIBUTE_UNUSED, | |
180 | const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED) | |
181 | { | |
182 | enum opt_code code = (enum opt_code) scode; | |
183 | bool ret = true; | |
184 | ||
185 | switch (code) | |
186 | { | |
187 | case OPT_I: | |
7a938933 ILT |
188 | go_add_search_path (arg); |
189 | break; | |
190 | ||
ac819ba5 ILT |
191 | case OPT_L: |
192 | /* A -L option is assumed to come from the compiler driver. | |
193 | This is a system directory. We search the following | |
194 | directories, if they exist, before this one: | |
195 | dir/go/VERSION | |
196 | dir/go/VERSION/MACHINE | |
197 | This is like include/c++. */ | |
198 | { | |
199 | static const char dir_separator_str[] = { DIR_SEPARATOR, 0 }; | |
200 | size_t len; | |
201 | char *p; | |
202 | struct stat st; | |
203 | ||
204 | len = strlen (arg); | |
205 | p = XALLOCAVEC (char, | |
206 | (len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION | |
207 | + sizeof DEFAULT_TARGET_MACHINE + 3)); | |
208 | strcpy (p, arg); | |
209 | if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1])) | |
210 | strcat (p, dir_separator_str); | |
211 | strcat (p, "go"); | |
212 | strcat (p, dir_separator_str); | |
213 | strcat (p, DEFAULT_TARGET_VERSION); | |
214 | if (stat (p, &st) == 0 && S_ISDIR (st.st_mode)) | |
215 | { | |
216 | go_add_search_path (p); | |
217 | strcat (p, dir_separator_str); | |
218 | strcat (p, DEFAULT_TARGET_MACHINE); | |
219 | if (stat (p, &st) == 0 && S_ISDIR (st.st_mode)) | |
220 | go_add_search_path (p); | |
221 | } | |
222 | ||
223 | /* Search ARG too, but only after we've searched to Go | |
224 | specific directories for all -L arguments. */ | |
225 | VEC_safe_push (go_char_p, heap, go_search_dirs, arg); | |
226 | } | |
227 | break; | |
228 | ||
7a938933 ILT |
229 | case OPT_fgo_dump_: |
230 | ret = go_enable_dump (arg) ? true : false; | |
231 | break; | |
232 | ||
706cd57f RL |
233 | case OPT_fgo_optimize_: |
234 | ret = go_enable_optimize (arg) ? true : false; | |
235 | break; | |
236 | ||
097b12fb ILT |
237 | case OPT_fgo_pkgpath_: |
238 | go_pkgpath = arg; | |
239 | break; | |
240 | ||
7a938933 | 241 | case OPT_fgo_prefix_: |
097b12fb | 242 | go_prefix = arg; |
7a938933 ILT |
243 | break; |
244 | ||
4e1866fe ILT |
245 | case OPT_fgo_relative_import_path_: |
246 | go_relative_import_path = arg; | |
247 | break; | |
248 | ||
7a938933 ILT |
249 | default: |
250 | /* Just return 1 to indicate that the option is valid. */ | |
251 | break; | |
252 | } | |
253 | ||
254 | return ret; | |
255 | } | |
256 | ||
257 | /* Run after parsing options. */ | |
258 | ||
259 | static bool | |
260 | go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED) | |
261 | { | |
ac819ba5 ILT |
262 | unsigned int ix; |
263 | const char *dir; | |
264 | ||
7a938933 ILT |
265 | gcc_assert (num_in_fnames > 0); |
266 | ||
ac819ba5 ILT |
267 | FOR_EACH_VEC_ELT (go_char_p, go_search_dirs, ix, dir) |
268 | go_add_search_path (dir); | |
269 | VEC_free (go_char_p, heap, go_search_dirs); | |
270 | go_search_dirs = NULL; | |
271 | ||
7a938933 ILT |
272 | if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT) |
273 | flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD; | |
274 | ||
275 | /* Returning false means that the backend should be used. */ | |
276 | return false; | |
277 | } | |
278 | ||
279 | static void | |
280 | go_langhook_parse_file (void) | |
281 | { | |
282 | go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only, | |
283 | go_require_return_statement); | |
284 | } | |
285 | ||
286 | static tree | |
287 | go_langhook_type_for_size (unsigned int bits, int unsignedp) | |
288 | { | |
289 | return go_type_for_size (bits, unsignedp); | |
290 | } | |
291 | ||
292 | static tree | |
293 | go_langhook_type_for_mode (enum machine_mode mode, int unsignedp) | |
294 | { | |
c2b13bb6 | 295 | tree type; |
0e29f7e5 ILT |
296 | /* Go has no vector types. Build them here. FIXME: It does not |
297 | make sense for the middle-end to ask the frontend for a type | |
298 | which the frontend does not support. However, at least for now | |
299 | it is required. See PR 46805. */ | |
300 | if (VECTOR_MODE_P (mode)) | |
301 | { | |
302 | tree inner; | |
303 | ||
304 | inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp); | |
305 | if (inner != NULL_TREE) | |
306 | return build_vector_type_for_mode (inner, mode); | |
307 | return NULL_TREE; | |
308 | } | |
309 | ||
c2b13bb6 JJ |
310 | type = go_type_for_mode (mode, unsignedp); |
311 | if (type) | |
312 | return type; | |
313 | ||
314 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
315 | /* The middle-end and some backends rely on TImode being supported | |
316 | for 64-bit HWI. */ | |
317 | if (mode == TImode) | |
318 | { | |
319 | type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode), | |
320 | unsignedp); | |
321 | if (type && TYPE_MODE (type) == TImode) | |
322 | return type; | |
323 | } | |
324 | #endif | |
325 | return NULL_TREE; | |
7a938933 ILT |
326 | } |
327 | ||
328 | /* Record a builtin function. We just ignore builtin functions. */ | |
329 | ||
330 | static tree | |
331 | go_langhook_builtin_function (tree decl) | |
332 | { | |
333 | return decl; | |
334 | } | |
335 | ||
c99c0026 EB |
336 | /* Return true if we are in the global binding level. */ |
337 | ||
338 | static bool | |
7a938933 ILT |
339 | go_langhook_global_bindings_p (void) |
340 | { | |
c99c0026 | 341 | return current_function_decl == NULL_TREE; |
7a938933 ILT |
342 | } |
343 | ||
344 | /* Push a declaration into the current binding level. We can't | |
345 | usefully implement this since we don't want to convert from tree | |
346 | back to one of our internal data structures. I think the only way | |
347 | this is used is to record a decl which is to be returned by | |
348 | getdecls, and we could implement it for that purpose if | |
349 | necessary. */ | |
350 | ||
351 | static tree | |
352 | go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED) | |
353 | { | |
354 | gcc_unreachable (); | |
355 | } | |
356 | ||
357 | /* This hook is used to get the current list of declarations as trees. | |
358 | We don't support that; instead we use the write_globals hook. This | |
359 | can't simply crash because it is called by -gstabs. */ | |
360 | ||
361 | static tree | |
362 | go_langhook_getdecls (void) | |
363 | { | |
364 | return NULL; | |
365 | } | |
366 | ||
367 | /* Write out globals. */ | |
368 | ||
369 | static void | |
370 | go_langhook_write_globals (void) | |
371 | { | |
372 | go_write_globals (); | |
373 | } | |
374 | ||
375 | /* Go specific gimplification. We need to gimplify | |
376 | CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle | |
377 | it. */ | |
378 | ||
379 | static int | |
380 | go_langhook_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p) | |
381 | { | |
382 | if (TREE_CODE (*expr_p) == CALL_EXPR | |
383 | && CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE) | |
384 | gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p, | |
385 | is_gimple_val, fb_rvalue); | |
386 | return GS_UNHANDLED; | |
387 | } | |
388 | ||
389 | /* Return a decl for the exception personality function. The function | |
390 | itself is implemented in libgo/runtime/go-unwind.c. */ | |
391 | ||
392 | static tree | |
393 | go_langhook_eh_personality (void) | |
394 | { | |
395 | static tree personality_decl; | |
396 | if (personality_decl == NULL_TREE) | |
397 | { | |
398 | personality_decl = build_personality_function ("gccgo"); | |
399 | go_preserve_from_gc (personality_decl); | |
400 | } | |
401 | return personality_decl; | |
402 | } | |
403 | ||
404 | /* Functions called directly by the generic backend. */ | |
405 | ||
406 | tree | |
407 | convert (tree type, tree expr) | |
408 | { | |
409 | if (type == error_mark_node | |
410 | || expr == error_mark_node | |
411 | || TREE_TYPE (expr) == error_mark_node) | |
412 | return error_mark_node; | |
413 | ||
414 | if (type == TREE_TYPE (expr)) | |
415 | return expr; | |
416 | ||
417 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr))) | |
418 | return fold_convert (type, expr); | |
419 | ||
420 | switch (TREE_CODE (type)) | |
421 | { | |
422 | case VOID_TYPE: | |
423 | case BOOLEAN_TYPE: | |
424 | return fold_convert (type, expr); | |
425 | case INTEGER_TYPE: | |
426 | return fold (convert_to_integer (type, expr)); | |
427 | case POINTER_TYPE: | |
428 | return fold (convert_to_pointer (type, expr)); | |
429 | case REAL_TYPE: | |
430 | return fold (convert_to_real (type, expr)); | |
431 | case COMPLEX_TYPE: | |
432 | return fold (convert_to_complex (type, expr)); | |
433 | default: | |
434 | break; | |
435 | } | |
436 | ||
437 | gcc_unreachable (); | |
438 | } | |
439 | ||
440 | /* FIXME: This is a hack to preserve trees that we create from the | |
441 | garbage collector. */ | |
442 | ||
443 | static GTY(()) tree go_gc_root; | |
444 | ||
445 | void | |
446 | go_preserve_from_gc (tree t) | |
447 | { | |
448 | go_gc_root = tree_cons (NULL_TREE, t, go_gc_root); | |
449 | } | |
450 | ||
451 | /* Convert an identifier for use in an error message. */ | |
452 | ||
453 | const char * | |
454 | go_localize_identifier (const char *ident) | |
455 | { | |
456 | return identifier_to_locale (ident); | |
457 | } | |
458 | ||
459 | #undef LANG_HOOKS_NAME | |
460 | #undef LANG_HOOKS_INIT | |
461 | #undef LANG_HOOKS_OPTION_LANG_MASK | |
462 | #undef LANG_HOOKS_INIT_OPTIONS_STRUCT | |
463 | #undef LANG_HOOKS_HANDLE_OPTION | |
464 | #undef LANG_HOOKS_POST_OPTIONS | |
465 | #undef LANG_HOOKS_PARSE_FILE | |
466 | #undef LANG_HOOKS_TYPE_FOR_MODE | |
467 | #undef LANG_HOOKS_TYPE_FOR_SIZE | |
468 | #undef LANG_HOOKS_BUILTIN_FUNCTION | |
469 | #undef LANG_HOOKS_GLOBAL_BINDINGS_P | |
470 | #undef LANG_HOOKS_PUSHDECL | |
471 | #undef LANG_HOOKS_GETDECLS | |
472 | #undef LANG_HOOKS_WRITE_GLOBALS | |
473 | #undef LANG_HOOKS_GIMPLIFY_EXPR | |
474 | #undef LANG_HOOKS_EH_PERSONALITY | |
475 | ||
476 | #define LANG_HOOKS_NAME "GNU Go" | |
477 | #define LANG_HOOKS_INIT go_langhook_init | |
478 | #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask | |
479 | #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct | |
480 | #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option | |
481 | #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options | |
482 | #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file | |
483 | #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode | |
484 | #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size | |
485 | #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function | |
486 | #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p | |
487 | #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl | |
488 | #define LANG_HOOKS_GETDECLS go_langhook_getdecls | |
489 | #define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals | |
490 | #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr | |
491 | #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality | |
492 | ||
493 | struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER; | |
494 | ||
495 | #include "gt-go-go-lang.h" | |
496 | #include "gtype-go.h" |