1 /* go-lang.c -- Go frontend gcc interface.
2 Copyright (C) 2009-2013 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"
33 #include "diagnostic.h"
34 #include "langhooks.h"
35 #include "langhooks-def.h"
37 #include "common/common-target.h"
43 /* Language-dependent contents of a type. */
45 struct GTY(()) lang_type
50 /* Language-dependent contents of a decl. */
52 struct GTY((variable_size)) lang_decl
57 /* Language-dependent contents of an identifier. This must include a
60 struct GTY(()) lang_identifier
62 struct tree_identifier common;
65 /* The resulting tree type. */
67 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
68 chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
71 union tree_node GTY((tag ("0"),
72 desc ("tree_node_structure (&%h)"))) generic;
73 struct lang_identifier GTY((tag ("1"))) identifier;
76 /* We don't use language_function. */
78 struct GTY(()) language_function
83 /* Option information we need to pass to go_create_gogo. */
85 static const char *go_pkgpath = NULL;
86 static const char *go_prefix = NULL;
87 static const char *go_relative_import_path = NULL;
92 go_langhook_init (void)
94 build_common_tree_nodes (false, false);
96 /* I don't know why this has to be done explicitly. */
97 void_list_node = build_tree_list (NULL_TREE, void_type_node);
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 go_create_gogo (INT_TYPE_SIZE, POINTER_SIZE, go_pkgpath, go_prefix,
105 go_relative_import_path);
107 build_common_builtin_nodes ();
109 /* The default precision for floating point numbers. This is used
110 for floating point constants with abstract type. This may
111 eventually be controllable by a command line option. */
112 mpfr_set_default_prec (256);
114 /* Go uses exceptions. */
115 using_eh_for_cleanups ();
120 /* The option mask. */
123 go_langhook_option_lang_mask (void)
128 /* Initialize the options structure. */
131 go_langhook_init_options_struct (struct gcc_options *opts)
133 /* Go says that signed overflow is precisely defined. */
134 opts->x_flag_wrapv = 1;
136 /* We default to using strict aliasing, since Go pointers are safe.
137 This is turned off for code that imports the "unsafe" package,
138 because using unsafe.pointer violates C style aliasing
140 opts->x_flag_strict_aliasing = 1;
142 /* Default to avoiding range issues for complex multiply and
144 opts->x_flag_complex_method = 2;
146 /* The builtin math functions should not set errno. */
147 opts->x_flag_errno_math = 0;
148 opts->frontend_set_flag_errno_math = true;
150 /* We turn on stack splitting if we can. */
151 if (targetm_common.supports_split_stack (false, opts))
152 opts->x_flag_split_stack = 1;
154 /* Exceptions are used to handle recovering from panics. */
155 opts->x_flag_exceptions = 1;
156 opts->x_flag_non_call_exceptions = 1;
159 /* Infrastructure for a vector of char * pointers. */
161 typedef const char *go_char_p;
163 /* The list of directories to search after all the Go specific
164 directories have been searched. */
166 static vec<go_char_p> go_search_dirs;
168 /* Handle Go specific options. Return 0 if we didn't do anything. */
171 go_langhook_handle_option (
174 int value ATTRIBUTE_UNUSED,
175 int kind ATTRIBUTE_UNUSED,
176 location_t loc ATTRIBUTE_UNUSED,
177 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
179 enum opt_code code = (enum opt_code) scode;
185 go_add_search_path (arg);
189 /* A -L option is assumed to come from the compiler driver.
190 This is a system directory. We search the following
191 directories, if they exist, before this one:
193 dir/go/VERSION/MACHINE
194 This is like include/c++. */
196 static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
202 p = XALLOCAVEC (char,
203 (len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION
204 + sizeof DEFAULT_TARGET_MACHINE + 3));
206 if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1]))
207 strcat (p, dir_separator_str);
209 strcat (p, dir_separator_str);
210 strcat (p, DEFAULT_TARGET_VERSION);
211 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
213 go_add_search_path (p);
214 strcat (p, dir_separator_str);
215 strcat (p, DEFAULT_TARGET_MACHINE);
216 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
217 go_add_search_path (p);
220 /* Search ARG too, but only after we've searched to Go
221 specific directories for all -L arguments. */
222 go_search_dirs.safe_push (arg);
227 ret = go_enable_dump (arg) ? true : false;
230 case OPT_fgo_optimize_:
231 ret = go_enable_optimize (arg) ? true : false;
234 case OPT_fgo_pkgpath_:
238 case OPT_fgo_prefix_:
242 case OPT_fgo_relative_import_path_:
243 go_relative_import_path = arg;
247 /* Just return 1 to indicate that the option is valid. */
254 /* Run after parsing options. */
257 go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
262 gcc_assert (num_in_fnames > 0);
264 FOR_EACH_VEC_ELT (go_search_dirs, ix, dir)
265 go_add_search_path (dir);
266 go_search_dirs.release ();
268 if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
269 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
271 /* The isolate_erroneous_paths optimization can change a nil
272 dereference from a panic to a trap, so we have to disable it for
273 Go, even though it is normally enabled by -O2. */
274 if (!global_options_set.x_flag_isolate_erroneous_paths)
275 global_options.x_flag_isolate_erroneous_paths = 0;
277 /* Returning false means that the backend should be used. */
282 go_langhook_parse_file (void)
284 go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only,
285 go_require_return_statement);
289 go_langhook_type_for_size (unsigned int bits, int unsignedp)
291 return go_type_for_size (bits, unsignedp);
295 go_langhook_type_for_mode (enum machine_mode mode, int unsignedp)
298 /* Go has no vector types. Build them here. FIXME: It does not
299 make sense for the middle-end to ask the frontend for a type
300 which the frontend does not support. However, at least for now
301 it is required. See PR 46805. */
302 if (VECTOR_MODE_P (mode))
306 inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
307 if (inner != NULL_TREE)
308 return build_vector_type_for_mode (inner, mode);
312 type = go_type_for_mode (mode, unsignedp);
316 #if HOST_BITS_PER_WIDE_INT >= 64
317 /* The middle-end and some backends rely on TImode being supported
321 type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode),
323 if (type && TYPE_MODE (type) == TImode)
330 /* Record a builtin function. We just ignore builtin functions. */
333 go_langhook_builtin_function (tree decl)
338 /* Return true if we are in the global binding level. */
341 go_langhook_global_bindings_p (void)
343 return current_function_decl == NULL_TREE;
346 /* Push a declaration into the current binding level. We can't
347 usefully implement this since we don't want to convert from tree
348 back to one of our internal data structures. I think the only way
349 this is used is to record a decl which is to be returned by
350 getdecls, and we could implement it for that purpose if
354 go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED)
359 /* This hook is used to get the current list of declarations as trees.
360 We don't support that; instead we use the write_globals hook. This
361 can't simply crash because it is called by -gstabs. */
364 go_langhook_getdecls (void)
369 /* Write out globals. */
372 go_langhook_write_globals (void)
377 /* Go specific gimplification. We need to gimplify
378 CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
382 go_langhook_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
384 if (TREE_CODE (*expr_p) == CALL_EXPR
385 && CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE)
386 gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p,
387 is_gimple_val, fb_rvalue);
391 /* Return a decl for the exception personality function. The function
392 itself is implemented in libgo/runtime/go-unwind.c. */
395 go_langhook_eh_personality (void)
397 static tree personality_decl;
398 if (personality_decl == NULL_TREE)
400 personality_decl = build_personality_function ("gccgo");
401 go_preserve_from_gc (personality_decl);
403 return personality_decl;
406 /* Functions called directly by the generic backend. */
409 convert (tree type, tree expr)
411 if (type == error_mark_node
412 || expr == error_mark_node
413 || TREE_TYPE (expr) == error_mark_node)
414 return error_mark_node;
416 if (type == TREE_TYPE (expr))
419 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
420 return fold_convert (type, expr);
422 switch (TREE_CODE (type))
426 return fold_convert (type, expr);
428 return fold (convert_to_integer (type, expr));
430 return fold (convert_to_pointer (type, expr));
432 return fold (convert_to_real (type, expr));
434 return fold (convert_to_complex (type, expr));
442 /* FIXME: This is a hack to preserve trees that we create from the
443 garbage collector. */
445 static GTY(()) tree go_gc_root;
448 go_preserve_from_gc (tree t)
450 go_gc_root = tree_cons (NULL_TREE, t, go_gc_root);
453 /* Convert an identifier for use in an error message. */
456 go_localize_identifier (const char *ident)
458 return identifier_to_locale (ident);
461 #undef LANG_HOOKS_NAME
462 #undef LANG_HOOKS_INIT
463 #undef LANG_HOOKS_OPTION_LANG_MASK
464 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
465 #undef LANG_HOOKS_HANDLE_OPTION
466 #undef LANG_HOOKS_POST_OPTIONS
467 #undef LANG_HOOKS_PARSE_FILE
468 #undef LANG_HOOKS_TYPE_FOR_MODE
469 #undef LANG_HOOKS_TYPE_FOR_SIZE
470 #undef LANG_HOOKS_BUILTIN_FUNCTION
471 #undef LANG_HOOKS_GLOBAL_BINDINGS_P
472 #undef LANG_HOOKS_PUSHDECL
473 #undef LANG_HOOKS_GETDECLS
474 #undef LANG_HOOKS_WRITE_GLOBALS
475 #undef LANG_HOOKS_GIMPLIFY_EXPR
476 #undef LANG_HOOKS_EH_PERSONALITY
478 #define LANG_HOOKS_NAME "GNU Go"
479 #define LANG_HOOKS_INIT go_langhook_init
480 #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
481 #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
482 #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
483 #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
484 #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
485 #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
486 #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
487 #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
488 #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
489 #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
490 #define LANG_HOOKS_GETDECLS go_langhook_getdecls
491 #define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals
492 #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
493 #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
495 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
497 #include "gt-go-go-lang.h"
498 #include "gtype-go.h"