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comparison gcc/go/go-lang.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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children 84e7813d76e9
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68:561a7518be6b 111:04ced10e8804
1 /* go-lang.c -- Go frontend gcc interface.
2 Copyright (C) 2009-2017 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 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 "coretypes.h"
23 #include "target.h"
24 #include "tree.h"
25 #include "gimple-expr.h"
26 #include "diagnostic.h"
27 #include "opts.h"
28 #include "fold-const.h"
29 #include "gimplify.h"
30 #include "stor-layout.h"
31 #include "debug.h"
32 #include "convert.h"
33 #include "langhooks.h"
34 #include "langhooks-def.h"
35 #include "common/common-target.h"
36
37 #include <mpfr.h>
38
39 #include "go-c.h"
40 #include "go-gcc.h"
41
42 /* Language-dependent contents of a type. */
43
44 struct GTY(()) lang_type
45 {
46 char dummy;
47 };
48
49 /* Language-dependent contents of a decl. */
50
51 struct GTY(()) lang_decl
52 {
53 char dummy;
54 };
55
56 /* Language-dependent contents of an identifier. This must include a
57 tree_identifier. */
58
59 struct GTY(()) lang_identifier
60 {
61 struct tree_identifier common;
62 };
63
64 /* The resulting tree type. */
65
66 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
67 chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
68 lang_tree_node
69 {
70 union tree_node GTY((tag ("0"),
71 desc ("tree_node_structure (&%h)"))) generic;
72 struct lang_identifier GTY((tag ("1"))) identifier;
73 };
74
75 /* We don't use language_function. */
76
77 struct GTY(()) language_function
78 {
79 int dummy;
80 };
81
82 /* Option information we need to pass to go_create_gogo. */
83
84 static const char *go_pkgpath = NULL;
85 static const char *go_prefix = NULL;
86 static const char *go_relative_import_path = NULL;
87 static const char *go_c_header = NULL;
88
89 /* Language hooks. */
90
91 static bool
92 go_langhook_init (void)
93 {
94 build_common_tree_nodes (false);
95
96 /* I don't know why this has to be done explicitly. */
97 void_list_node = build_tree_list (NULL_TREE, void_type_node);
98
99 /* We must create the gogo IR after calling build_common_tree_nodes
100 (because Gogo::define_builtin_function_trees refers indirectly
101 to, e.g., unsigned_char_type_node) but before calling
102 build_common_builtin_nodes (because it calls, indirectly,
103 go_type_for_size). */
104 struct go_create_gogo_args args;
105 args.int_type_size = INT_TYPE_SIZE;
106 args.pointer_size = POINTER_SIZE;
107 args.pkgpath = go_pkgpath;
108 args.prefix = go_prefix;
109 args.relative_import_path = go_relative_import_path;
110 args.c_header = go_c_header;
111 args.check_divide_by_zero = go_check_divide_zero;
112 args.check_divide_overflow = go_check_divide_overflow;
113 args.compiling_runtime = go_compiling_runtime;
114 args.debug_escape_level = go_debug_escape_level;
115 args.linemap = go_get_linemap();
116 args.backend = go_get_backend();
117 go_create_gogo (&args);
118
119 build_common_builtin_nodes ();
120
121 /* The default precision for floating point numbers. This is used
122 for floating point constants with abstract type. This may
123 eventually be controllable by a command line option. */
124 mpfr_set_default_prec (256);
125
126 /* Go uses exceptions. */
127 using_eh_for_cleanups ();
128
129 return true;
130 }
131
132 /* The option mask. */
133
134 static unsigned int
135 go_langhook_option_lang_mask (void)
136 {
137 return CL_Go;
138 }
139
140 /* Initialize the options structure. */
141
142 static void
143 go_langhook_init_options_struct (struct gcc_options *opts)
144 {
145 /* Go says that signed overflow is precisely defined. */
146 opts->x_flag_wrapv = 1;
147
148 /* We default to using strict aliasing, since Go pointers are safe.
149 This is turned off for code that imports the "unsafe" package,
150 because using unsafe.pointer violates C style aliasing
151 requirements. */
152 opts->x_flag_strict_aliasing = 1;
153
154 /* Default to avoiding range issues for complex multiply and
155 divide. */
156 opts->x_flag_complex_method = 2;
157
158 /* The builtin math functions should not set errno. */
159 opts->x_flag_errno_math = 0;
160 opts->frontend_set_flag_errno_math = true;
161
162 /* Exceptions are used to handle recovering from panics. */
163 opts->x_flag_exceptions = 1;
164 opts->x_flag_non_call_exceptions = 1;
165
166 /* We need to keep pointers live for the garbage collector. */
167 opts->x_flag_keep_gc_roots_live = 1;
168
169 /* Go programs expect runtime.Callers to work, and that uses
170 libbacktrace that uses debug info. Set the debug info level to 1
171 by default. In post_options we will set the debug type if the
172 debug info level was not set back to 0 on the command line. */
173 opts->x_debug_info_level = DINFO_LEVEL_TERSE;
174 }
175
176 /* Infrastructure for a vector of char * pointers. */
177
178 typedef const char *go_char_p;
179
180 /* The list of directories to search after all the Go specific
181 directories have been searched. */
182
183 static vec<go_char_p> go_search_dirs;
184
185 /* Handle Go specific options. Return 0 if we didn't do anything. */
186
187 static bool
188 go_langhook_handle_option (
189 size_t scode,
190 const char *arg,
191 int value ATTRIBUTE_UNUSED,
192 int kind ATTRIBUTE_UNUSED,
193 location_t loc ATTRIBUTE_UNUSED,
194 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
195 {
196 enum opt_code code = (enum opt_code) scode;
197 bool ret = true;
198
199 switch (code)
200 {
201 case OPT_I:
202 go_add_search_path (arg);
203 break;
204
205 case OPT_L:
206 /* A -L option is assumed to come from the compiler driver.
207 This is a system directory. We search the following
208 directories, if they exist, before this one:
209 dir/go/VERSION
210 dir/go/VERSION/MACHINE
211 This is like include/c++. */
212 {
213 static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
214 size_t len;
215 char *p;
216 struct stat st;
217
218 len = strlen (arg);
219 p = XALLOCAVEC (char,
220 (len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION
221 + sizeof DEFAULT_TARGET_MACHINE + 3));
222 strcpy (p, arg);
223 if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1]))
224 strcat (p, dir_separator_str);
225 strcat (p, "go");
226 strcat (p, dir_separator_str);
227 strcat (p, DEFAULT_TARGET_VERSION);
228 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
229 {
230 go_add_search_path (p);
231 strcat (p, dir_separator_str);
232 strcat (p, DEFAULT_TARGET_MACHINE);
233 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
234 go_add_search_path (p);
235 }
236
237 /* Search ARG too, but only after we've searched to Go
238 specific directories for all -L arguments. */
239 go_search_dirs.safe_push (arg);
240 }
241 break;
242
243 case OPT_fgo_dump_:
244 ret = go_enable_dump (arg) ? true : false;
245 break;
246
247 case OPT_fgo_optimize_:
248 ret = go_enable_optimize (arg) ? true : false;
249 break;
250
251 case OPT_fgo_pkgpath_:
252 go_pkgpath = arg;
253 break;
254
255 case OPT_fgo_prefix_:
256 go_prefix = arg;
257 break;
258
259 case OPT_fgo_relative_import_path_:
260 go_relative_import_path = arg;
261 break;
262
263 case OPT_fgo_c_header_:
264 go_c_header = arg;
265 break;
266
267 default:
268 /* Just return 1 to indicate that the option is valid. */
269 break;
270 }
271
272 return ret;
273 }
274
275 /* Run after parsing options. */
276
277 static bool
278 go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
279 {
280 unsigned int ix;
281 const char *dir;
282
283 gcc_assert (num_in_fnames > 0);
284
285 FOR_EACH_VEC_ELT (go_search_dirs, ix, dir)
286 go_add_search_path (dir);
287 go_search_dirs.release ();
288
289 if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
290 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
291
292 /* Tail call optimizations can confuse uses of runtime.Callers. */
293 if (!global_options_set.x_flag_optimize_sibling_calls)
294 global_options.x_flag_optimize_sibling_calls = 0;
295
296 /* If the debug info level is still 1, as set in init_options, make
297 sure that some debugging type is selected. */
298 if (global_options.x_debug_info_level == DINFO_LEVEL_TERSE
299 && global_options.x_write_symbols == NO_DEBUG)
300 global_options.x_write_symbols = PREFERRED_DEBUGGING_TYPE;
301
302 /* We turn on stack splitting if we can. */
303 if (!global_options_set.x_flag_split_stack
304 && targetm_common.supports_split_stack (false, &global_options))
305 global_options.x_flag_split_stack = 1;
306
307 /* If stack splitting is turned on, and the user did not explicitly
308 request function partitioning, turn off partitioning, as it
309 confuses the linker when trying to handle partitioned split-stack
310 code that calls a non-split-stack function. */
311 if (global_options.x_flag_split_stack
312 && global_options.x_flag_reorder_blocks_and_partition
313 && !global_options_set.x_flag_reorder_blocks_and_partition)
314 global_options.x_flag_reorder_blocks_and_partition = 0;
315
316 /* Returning false means that the backend should be used. */
317 return false;
318 }
319
320 static void
321 go_langhook_parse_file (void)
322 {
323 go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only,
324 go_require_return_statement);
325
326 /* Final processing of globals and early debug info generation. */
327 go_write_globals ();
328 }
329
330 static tree
331 go_langhook_type_for_size (unsigned int bits, int unsignedp)
332 {
333 tree type;
334 if (unsignedp)
335 {
336 if (bits == INT_TYPE_SIZE)
337 type = unsigned_type_node;
338 else if (bits == CHAR_TYPE_SIZE)
339 type = unsigned_char_type_node;
340 else if (bits == SHORT_TYPE_SIZE)
341 type = short_unsigned_type_node;
342 else if (bits == LONG_TYPE_SIZE)
343 type = long_unsigned_type_node;
344 else if (bits == LONG_LONG_TYPE_SIZE)
345 type = long_long_unsigned_type_node;
346 else
347 type = make_unsigned_type(bits);
348 }
349 else
350 {
351 if (bits == INT_TYPE_SIZE)
352 type = integer_type_node;
353 else if (bits == CHAR_TYPE_SIZE)
354 type = signed_char_type_node;
355 else if (bits == SHORT_TYPE_SIZE)
356 type = short_integer_type_node;
357 else if (bits == LONG_TYPE_SIZE)
358 type = long_integer_type_node;
359 else if (bits == LONG_LONG_TYPE_SIZE)
360 type = long_long_integer_type_node;
361 else
362 type = make_signed_type(bits);
363 }
364 return type;
365 }
366
367 static tree
368 go_langhook_type_for_mode (machine_mode mode, int unsignedp)
369 {
370 tree type;
371 /* Go has no vector types. Build them here. FIXME: It does not
372 make sense for the middle-end to ask the frontend for a type
373 which the frontend does not support. However, at least for now
374 it is required. See PR 46805. */
375 if (VECTOR_MODE_P (mode))
376 {
377 tree inner;
378
379 inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
380 if (inner != NULL_TREE)
381 return build_vector_type_for_mode (inner, mode);
382 return NULL_TREE;
383 }
384
385 scalar_int_mode imode;
386 scalar_float_mode fmode;
387 complex_mode cmode;
388 if (is_int_mode (mode, &imode))
389 return go_langhook_type_for_size (GET_MODE_BITSIZE (imode), unsignedp);
390 else if (is_float_mode (mode, &fmode))
391 {
392 switch (GET_MODE_BITSIZE (fmode))
393 {
394 case 32:
395 return float_type_node;
396 case 64:
397 return double_type_node;
398 default:
399 // We have to check for long double in order to support
400 // i386 excess precision.
401 if (fmode == TYPE_MODE(long_double_type_node))
402 return long_double_type_node;
403 }
404 }
405 else if (is_complex_float_mode (mode, &cmode))
406 {
407 switch (GET_MODE_BITSIZE (cmode))
408 {
409 case 64:
410 return complex_float_type_node;
411 case 128:
412 return complex_double_type_node;
413 default:
414 // We have to check for long double in order to support
415 // i386 excess precision.
416 if (cmode == TYPE_MODE(complex_long_double_type_node))
417 return complex_long_double_type_node;
418 }
419 }
420
421 #if HOST_BITS_PER_WIDE_INT >= 64
422 /* The middle-end and some backends rely on TImode being supported
423 for 64-bit HWI. */
424 if (mode == TImode)
425 {
426 type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode),
427 unsignedp);
428 if (type && TYPE_MODE (type) == TImode)
429 return type;
430 }
431 #endif
432 return NULL_TREE;
433 }
434
435 /* Record a builtin function. We just ignore builtin functions. */
436
437 static tree
438 go_langhook_builtin_function (tree decl)
439 {
440 return decl;
441 }
442
443 /* Return true if we are in the global binding level. */
444
445 static bool
446 go_langhook_global_bindings_p (void)
447 {
448 return current_function_decl == NULL_TREE;
449 }
450
451 /* Push a declaration into the current binding level. We can't
452 usefully implement this since we don't want to convert from tree
453 back to one of our internal data structures. I think the only way
454 this is used is to record a decl which is to be returned by
455 getdecls, and we could implement it for that purpose if
456 necessary. */
457
458 static tree
459 go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED)
460 {
461 gcc_unreachable ();
462 }
463
464 /* This hook is used to get the current list of declarations as trees.
465 We don't support that; instead we use the write_globals hook. This
466 can't simply crash because it is called by -gstabs. */
467
468 static tree
469 go_langhook_getdecls (void)
470 {
471 return NULL;
472 }
473
474 /* Go specific gimplification. We need to gimplify
475 CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
476 it. */
477
478 static int
479 go_langhook_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
480 {
481 if (TREE_CODE (*expr_p) == CALL_EXPR
482 && CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE)
483 gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p,
484 is_gimple_val, fb_rvalue);
485 return GS_UNHANDLED;
486 }
487
488 /* Return a decl for the exception personality function. The function
489 itself is implemented in libgo/runtime/go-unwind.c. */
490
491 static tree
492 go_langhook_eh_personality (void)
493 {
494 static tree personality_decl;
495 if (personality_decl == NULL_TREE)
496 {
497 personality_decl = build_personality_function ("gccgo");
498 go_preserve_from_gc (personality_decl);
499 }
500 return personality_decl;
501 }
502
503 /* Functions called directly by the generic backend. */
504
505 tree
506 convert (tree type, tree expr)
507 {
508 if (type == error_mark_node
509 || expr == error_mark_node
510 || TREE_TYPE (expr) == error_mark_node)
511 return error_mark_node;
512
513 if (type == TREE_TYPE (expr))
514 return expr;
515
516 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
517 return fold_convert (type, expr);
518
519 switch (TREE_CODE (type))
520 {
521 case VOID_TYPE:
522 case BOOLEAN_TYPE:
523 return fold_convert (type, expr);
524 case INTEGER_TYPE:
525 return fold (convert_to_integer (type, expr));
526 case POINTER_TYPE:
527 return fold (convert_to_pointer (type, expr));
528 case REAL_TYPE:
529 return fold (convert_to_real (type, expr));
530 case COMPLEX_TYPE:
531 return fold (convert_to_complex (type, expr));
532 default:
533 break;
534 }
535
536 gcc_unreachable ();
537 }
538
539 /* FIXME: This is a hack to preserve trees that we create from the
540 garbage collector. */
541
542 static GTY(()) tree go_gc_root;
543
544 void
545 go_preserve_from_gc (tree t)
546 {
547 go_gc_root = tree_cons (NULL_TREE, t, go_gc_root);
548 }
549
550 /* Convert an identifier for use in an error message. */
551
552 const char *
553 go_localize_identifier (const char *ident)
554 {
555 return identifier_to_locale (ident);
556 }
557
558 #undef LANG_HOOKS_NAME
559 #undef LANG_HOOKS_INIT
560 #undef LANG_HOOKS_OPTION_LANG_MASK
561 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
562 #undef LANG_HOOKS_HANDLE_OPTION
563 #undef LANG_HOOKS_POST_OPTIONS
564 #undef LANG_HOOKS_PARSE_FILE
565 #undef LANG_HOOKS_TYPE_FOR_MODE
566 #undef LANG_HOOKS_TYPE_FOR_SIZE
567 #undef LANG_HOOKS_BUILTIN_FUNCTION
568 #undef LANG_HOOKS_GLOBAL_BINDINGS_P
569 #undef LANG_HOOKS_PUSHDECL
570 #undef LANG_HOOKS_GETDECLS
571 #undef LANG_HOOKS_GIMPLIFY_EXPR
572 #undef LANG_HOOKS_EH_PERSONALITY
573
574 #define LANG_HOOKS_NAME "GNU Go"
575 #define LANG_HOOKS_INIT go_langhook_init
576 #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
577 #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
578 #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
579 #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
580 #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
581 #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
582 #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
583 #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
584 #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
585 #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
586 #define LANG_HOOKS_GETDECLS go_langhook_getdecls
587 #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
588 #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
589
590 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
591
592 #include "gt-go-go-lang.h"
593 #include "gtype-go.h"