1 /* go-lang.c -- Go frontend gcc interface.
2 Copyright (C) 2009-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
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
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
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/>. */
23 #include "coretypes.h"
26 #include "basic-block.h"
27 #include "gimple-expr.h"
29 #include "stor-layout.h"
35 #include "diagnostic.h"
36 #include "langhooks.h"
37 #include "langhooks-def.h"
39 #include "common/common-target.h"
45 /* Language-dependent contents of a type. */
47 struct GTY(()) lang_type
52 /* Language-dependent contents of a decl. */
54 struct GTY((variable_size)) lang_decl
59 /* Language-dependent contents of an identifier. This must include a
62 struct GTY(()) lang_identifier
64 struct tree_identifier common;
67 /* The resulting tree type. */
69 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
70 chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
73 union tree_node GTY((tag ("0"),
74 desc ("tree_node_structure (&%h)"))) generic;
75 struct lang_identifier GTY((tag ("1"))) identifier;
78 /* We don't use language_function. */
80 struct GTY(()) language_function
85 /* Option information we need to pass to go_create_gogo. */
87 static const char *go_pkgpath = NULL;
88 static const char *go_prefix = NULL;
89 static const char *go_relative_import_path = NULL;
94 go_langhook_init (void)
96 build_common_tree_nodes (false, false);
98 /* I don't know why this has to be done explicitly. */
99 void_list_node = build_tree_list (NULL_TREE, void_type_node);
101 /* We must create the gogo IR after calling build_common_tree_nodes
102 (because Gogo::define_builtin_function_trees refers indirectly
103 to, e.g., unsigned_char_type_node) but before calling
104 build_common_builtin_nodes (because it calls, indirectly,
105 go_type_for_size). */
106 go_create_gogo (INT_TYPE_SIZE, POINTER_SIZE, go_pkgpath, go_prefix,
107 go_relative_import_path, go_check_divide_zero,
108 go_check_divide_overflow);
110 build_common_builtin_nodes ();
112 /* The default precision for floating point numbers. This is used
113 for floating point constants with abstract type. This may
114 eventually be controllable by a command line option. */
115 mpfr_set_default_prec (256);
117 /* Go uses exceptions. */
118 using_eh_for_cleanups ();
123 /* The option mask. */
126 go_langhook_option_lang_mask (void)
131 /* Initialize the options structure. */
134 go_langhook_init_options_struct (struct gcc_options *opts)
136 /* Go says that signed overflow is precisely defined. */
137 opts->x_flag_wrapv = 1;
139 /* We default to using strict aliasing, since Go pointers are safe.
140 This is turned off for code that imports the "unsafe" package,
141 because using unsafe.pointer violates C style aliasing
143 opts->x_flag_strict_aliasing = 1;
145 /* Default to avoiding range issues for complex multiply and
147 opts->x_flag_complex_method = 2;
149 /* The builtin math functions should not set errno. */
150 opts->x_flag_errno_math = 0;
151 opts->frontend_set_flag_errno_math = true;
153 /* We turn on stack splitting if we can. */
154 if (targetm_common.supports_split_stack (false, opts))
155 opts->x_flag_split_stack = 1;
157 /* Exceptions are used to handle recovering from panics. */
158 opts->x_flag_exceptions = 1;
159 opts->x_flag_non_call_exceptions = 1;
162 /* Infrastructure for a vector of char * pointers. */
164 typedef const char *go_char_p;
166 /* The list of directories to search after all the Go specific
167 directories have been searched. */
169 static vec<go_char_p> go_search_dirs;
171 /* Handle Go specific options. Return 0 if we didn't do anything. */
174 go_langhook_handle_option (
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)
182 enum opt_code code = (enum opt_code) scode;
188 go_add_search_path (arg);
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:
196 dir/go/VERSION/MACHINE
197 This is like include/c++. */
199 static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
205 p = XALLOCAVEC (char,
206 (len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION
207 + sizeof DEFAULT_TARGET_MACHINE + 3));
209 if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1]))
210 strcat (p, dir_separator_str);
212 strcat (p, dir_separator_str);
213 strcat (p, DEFAULT_TARGET_VERSION);
214 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
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);
223 /* Search ARG too, but only after we've searched to Go
224 specific directories for all -L arguments. */
225 go_search_dirs.safe_push (arg);
230 ret = go_enable_dump (arg) ? true : false;
233 case OPT_fgo_optimize_:
234 ret = go_enable_optimize (arg) ? true : false;
237 case OPT_fgo_pkgpath_:
241 case OPT_fgo_prefix_:
245 case OPT_fgo_relative_import_path_:
246 go_relative_import_path = arg;
250 /* Just return 1 to indicate that the option is valid. */
257 /* Run after parsing options. */
260 go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
265 gcc_assert (num_in_fnames > 0);
267 FOR_EACH_VEC_ELT (go_search_dirs, ix, dir)
268 go_add_search_path (dir);
269 go_search_dirs.release ();
271 if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
272 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
274 /* Tail call optimizations can confuse uses of runtime.Callers. */
275 if (!global_options_set.x_flag_optimize_sibling_calls)
276 global_options.x_flag_optimize_sibling_calls = 0;
278 /* Returning false means that the backend should be used. */
283 go_langhook_parse_file (void)
285 go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only,
286 go_require_return_statement);
290 go_langhook_type_for_size (unsigned int bits, int unsignedp)
295 if (bits == INT_TYPE_SIZE)
296 type = unsigned_type_node;
297 else if (bits == CHAR_TYPE_SIZE)
298 type = unsigned_char_type_node;
299 else if (bits == SHORT_TYPE_SIZE)
300 type = short_unsigned_type_node;
301 else if (bits == LONG_TYPE_SIZE)
302 type = long_unsigned_type_node;
303 else if (bits == LONG_LONG_TYPE_SIZE)
304 type = long_long_unsigned_type_node;
306 type = make_unsigned_type(bits);
310 if (bits == INT_TYPE_SIZE)
311 type = integer_type_node;
312 else if (bits == CHAR_TYPE_SIZE)
313 type = signed_char_type_node;
314 else if (bits == SHORT_TYPE_SIZE)
315 type = short_integer_type_node;
316 else if (bits == LONG_TYPE_SIZE)
317 type = long_integer_type_node;
318 else if (bits == LONG_LONG_TYPE_SIZE)
319 type = long_long_integer_type_node;
321 type = make_signed_type(bits);
327 go_langhook_type_for_mode (enum machine_mode mode, int unsignedp)
330 /* Go has no vector types. Build them here. FIXME: It does not
331 make sense for the middle-end to ask the frontend for a type
332 which the frontend does not support. However, at least for now
333 it is required. See PR 46805. */
334 if (VECTOR_MODE_P (mode))
338 inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
339 if (inner != NULL_TREE)
340 return build_vector_type_for_mode (inner, mode);
344 // FIXME: This static_cast should be in machmode.h.
345 enum mode_class mc = static_cast<enum mode_class>(GET_MODE_CLASS(mode));
347 return go_langhook_type_for_size(GET_MODE_BITSIZE(mode), unsignedp);
348 else if (mc == MODE_FLOAT)
350 switch (GET_MODE_BITSIZE (mode))
353 return float_type_node;
355 return double_type_node;
357 // We have to check for long double in order to support
358 // i386 excess precision.
359 if (mode == TYPE_MODE(long_double_type_node))
360 return long_double_type_node;
363 else if (mc == MODE_COMPLEX_FLOAT)
365 switch (GET_MODE_BITSIZE (mode))
368 return complex_float_type_node;
370 return complex_double_type_node;
372 // We have to check for long double in order to support
373 // i386 excess precision.
374 if (mode == TYPE_MODE(complex_long_double_type_node))
375 return complex_long_double_type_node;
379 #if HOST_BITS_PER_WIDE_INT >= 64
380 /* The middle-end and some backends rely on TImode being supported
384 type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode),
386 if (type && TYPE_MODE (type) == TImode)
393 /* Record a builtin function. We just ignore builtin functions. */
396 go_langhook_builtin_function (tree decl)
401 /* Return true if we are in the global binding level. */
404 go_langhook_global_bindings_p (void)
406 return current_function_decl == NULL_TREE;
409 /* Push a declaration into the current binding level. We can't
410 usefully implement this since we don't want to convert from tree
411 back to one of our internal data structures. I think the only way
412 this is used is to record a decl which is to be returned by
413 getdecls, and we could implement it for that purpose if
417 go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED)
422 /* This hook is used to get the current list of declarations as trees.
423 We don't support that; instead we use the write_globals hook. This
424 can't simply crash because it is called by -gstabs. */
427 go_langhook_getdecls (void)
432 /* Write out globals. */
435 go_langhook_write_globals (void)
440 /* Go specific gimplification. We need to gimplify
441 CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
445 go_langhook_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
447 if (TREE_CODE (*expr_p) == CALL_EXPR
448 && CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE)
449 gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p,
450 is_gimple_val, fb_rvalue);
454 /* Return a decl for the exception personality function. The function
455 itself is implemented in libgo/runtime/go-unwind.c. */
458 go_langhook_eh_personality (void)
460 static tree personality_decl;
461 if (personality_decl == NULL_TREE)
463 personality_decl = build_personality_function ("gccgo");
464 go_preserve_from_gc (personality_decl);
466 return personality_decl;
469 /* Functions called directly by the generic backend. */
472 convert (tree type, tree expr)
474 if (type == error_mark_node
475 || expr == error_mark_node
476 || TREE_TYPE (expr) == error_mark_node)
477 return error_mark_node;
479 if (type == TREE_TYPE (expr))
482 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
483 return fold_convert (type, expr);
485 switch (TREE_CODE (type))
489 return fold_convert (type, expr);
491 return fold (convert_to_integer (type, expr));
493 return fold (convert_to_pointer (type, expr));
495 return fold (convert_to_real (type, expr));
497 return fold (convert_to_complex (type, expr));
505 /* FIXME: This is a hack to preserve trees that we create from the
506 garbage collector. */
508 static GTY(()) tree go_gc_root;
511 go_preserve_from_gc (tree t)
513 go_gc_root = tree_cons (NULL_TREE, t, go_gc_root);
516 /* Convert an identifier for use in an error message. */
519 go_localize_identifier (const char *ident)
521 return identifier_to_locale (ident);
524 #undef LANG_HOOKS_NAME
525 #undef LANG_HOOKS_INIT
526 #undef LANG_HOOKS_OPTION_LANG_MASK
527 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
528 #undef LANG_HOOKS_HANDLE_OPTION
529 #undef LANG_HOOKS_POST_OPTIONS
530 #undef LANG_HOOKS_PARSE_FILE
531 #undef LANG_HOOKS_TYPE_FOR_MODE
532 #undef LANG_HOOKS_TYPE_FOR_SIZE
533 #undef LANG_HOOKS_BUILTIN_FUNCTION
534 #undef LANG_HOOKS_GLOBAL_BINDINGS_P
535 #undef LANG_HOOKS_PUSHDECL
536 #undef LANG_HOOKS_GETDECLS
537 #undef LANG_HOOKS_WRITE_GLOBALS
538 #undef LANG_HOOKS_GIMPLIFY_EXPR
539 #undef LANG_HOOKS_EH_PERSONALITY
541 #define LANG_HOOKS_NAME "GNU Go"
542 #define LANG_HOOKS_INIT go_langhook_init
543 #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
544 #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
545 #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
546 #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
547 #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
548 #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
549 #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
550 #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
551 #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
552 #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
553 #define LANG_HOOKS_GETDECLS go_langhook_getdecls
554 #define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals
555 #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
556 #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
558 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
560 #include "gt-go-go-lang.h"
561 #include "gtype-go.h"