1 /* go-lang.c -- Go frontend gcc interface.
2 Copyright (C) 2009, 2010, 2011 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"
43 /* Language-dependent contents of a type. */
45 struct GTY(()) lang_type
50 /* Language-dependent contents of a decl. */
52 struct GTY(()) 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
86 go_langhook_init (void)
88 build_common_tree_nodes (false);
90 /* The sizetype may be "unsigned long" or "unsigned long long". */
91 if (TYPE_MODE (long_unsigned_type_node) == ptr_mode)
92 size_type_node = long_unsigned_type_node;
93 else if (TYPE_MODE (long_long_unsigned_type_node) == ptr_mode)
94 size_type_node = long_long_unsigned_type_node;
96 size_type_node = long_unsigned_type_node;
97 set_sizetype (size_type_node);
99 build_common_tree_nodes_2 (0);
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);
108 build_common_builtin_nodes ();
110 /* I don't know why this is not done by any of the above. */
111 void_list_node = build_tree_list (NULL_TREE, void_type_node);
113 /* The default precision for floating point numbers. This is used
114 for floating point constants with abstract type. This may
115 eventually be controllable by a command line option. */
116 mpfr_set_default_prec (128);
118 /* Go uses exceptions. */
119 using_eh_for_cleanups ();
124 /* The option mask. */
127 go_langhook_option_lang_mask (void)
132 /* Initialize the options structure. */
135 go_langhook_init_options_struct (struct gcc_options *opts)
137 /* Go says that signed overflow is precisely defined. */
138 opts->x_flag_wrapv = 1;
140 /* We default to using strict aliasing, since Go pointers are safe.
141 This is turned off for code that imports the "unsafe" package,
142 because using unsafe.pointer violates C style aliasing
144 opts->x_flag_strict_aliasing = 1;
146 /* Default to avoiding range issues for complex multiply and
148 opts->x_flag_complex_method = 2;
150 /* The builtin math functions should not set errno. */
151 opts->x_flag_errno_math = 0;
152 opts->frontend_set_flag_errno_math = true;
154 /* We turn on stack splitting if we can. */
155 if (targetm.supports_split_stack (false, opts))
156 opts->x_flag_split_stack = 1;
158 /* Exceptions are used to handle recovering from panics. */
159 opts->x_flag_exceptions = 1;
160 opts->x_flag_non_call_exceptions = 1;
163 /* Infrastructure for a VEC of char * pointers. */
165 typedef const char *go_char_p;
166 DEF_VEC_P(go_char_p);
167 DEF_VEC_ALLOC_P(go_char_p, heap);
169 /* The list of directories to search after all the Go specific
170 directories have been searched. */
172 static VEC(go_char_p, heap) *go_search_dirs;
174 /* Handle Go specific options. Return 0 if we didn't do anything. */
177 go_langhook_handle_option (
180 int value ATTRIBUTE_UNUSED,
181 int kind ATTRIBUTE_UNUSED,
182 location_t loc ATTRIBUTE_UNUSED,
183 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
185 enum opt_code code = (enum opt_code) scode;
191 go_add_search_path (arg);
195 /* A -L option is assumed to come from the compiler driver.
196 This is a system directory. We search the following
197 directories, if they exist, before this one:
199 dir/go/VERSION/MACHINE
200 This is like include/c++. */
202 static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
208 p = XALLOCAVEC (char,
209 (len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION
210 + sizeof DEFAULT_TARGET_MACHINE + 3));
212 if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1]))
213 strcat (p, dir_separator_str);
215 strcat (p, dir_separator_str);
216 strcat (p, DEFAULT_TARGET_VERSION);
217 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
219 go_add_search_path (p);
220 strcat (p, dir_separator_str);
221 strcat (p, DEFAULT_TARGET_MACHINE);
222 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
223 go_add_search_path (p);
226 /* Search ARG too, but only after we've searched to Go
227 specific directories for all -L arguments. */
228 VEC_safe_push (go_char_p, heap, go_search_dirs, arg);
233 ret = go_enable_dump (arg) ? true : false;
236 case OPT_fgo_prefix_:
241 /* Just return 1 to indicate that the option is valid. */
248 /* Run after parsing options. */
251 go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
256 gcc_assert (num_in_fnames > 0);
258 FOR_EACH_VEC_ELT (go_char_p, go_search_dirs, ix, dir)
259 go_add_search_path (dir);
260 VEC_free (go_char_p, heap, go_search_dirs);
261 go_search_dirs = NULL;
263 if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
264 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
266 /* Returning false means that the backend should be used. */
271 go_langhook_parse_file (void)
273 go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only,
274 go_require_return_statement);
278 go_langhook_type_for_size (unsigned int bits, int unsignedp)
280 return go_type_for_size (bits, unsignedp);
284 go_langhook_type_for_mode (enum machine_mode mode, int unsignedp)
286 /* Go has no vector types. Build them here. FIXME: It does not
287 make sense for the middle-end to ask the frontend for a type
288 which the frontend does not support. However, at least for now
289 it is required. See PR 46805. */
290 if (VECTOR_MODE_P (mode))
294 inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
295 if (inner != NULL_TREE)
296 return build_vector_type_for_mode (inner, mode);
300 return go_type_for_mode (mode, unsignedp);
303 /* Record a builtin function. We just ignore builtin functions. */
306 go_langhook_builtin_function (tree decl)
312 go_langhook_global_bindings_p (void)
314 return current_function_decl == NULL ? 1 : 0;
317 /* Push a declaration into the current binding level. We can't
318 usefully implement this since we don't want to convert from tree
319 back to one of our internal data structures. I think the only way
320 this is used is to record a decl which is to be returned by
321 getdecls, and we could implement it for that purpose if
325 go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED)
330 /* This hook is used to get the current list of declarations as trees.
331 We don't support that; instead we use the write_globals hook. This
332 can't simply crash because it is called by -gstabs. */
335 go_langhook_getdecls (void)
340 /* Write out globals. */
343 go_langhook_write_globals (void)
348 /* Go specific gimplification. We need to gimplify
349 CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
353 go_langhook_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
355 if (TREE_CODE (*expr_p) == CALL_EXPR
356 && CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE)
357 gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p,
358 is_gimple_val, fb_rvalue);
362 /* Return a decl for the exception personality function. The function
363 itself is implemented in libgo/runtime/go-unwind.c. */
366 go_langhook_eh_personality (void)
368 static tree personality_decl;
369 if (personality_decl == NULL_TREE)
371 personality_decl = build_personality_function ("gccgo");
372 go_preserve_from_gc (personality_decl);
374 return personality_decl;
377 /* Functions called directly by the generic backend. */
380 convert (tree type, tree expr)
382 if (type == error_mark_node
383 || expr == error_mark_node
384 || TREE_TYPE (expr) == error_mark_node)
385 return error_mark_node;
387 if (type == TREE_TYPE (expr))
390 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
391 return fold_convert (type, expr);
393 switch (TREE_CODE (type))
397 return fold_convert (type, expr);
399 return fold (convert_to_integer (type, expr));
401 return fold (convert_to_pointer (type, expr));
403 return fold (convert_to_real (type, expr));
405 return fold (convert_to_complex (type, expr));
413 /* FIXME: This is a hack to preserve trees that we create from the
414 garbage collector. */
416 static GTY(()) tree go_gc_root;
419 go_preserve_from_gc (tree t)
421 go_gc_root = tree_cons (NULL_TREE, t, go_gc_root);
424 /* Convert an identifier for use in an error message. */
427 go_localize_identifier (const char *ident)
429 return identifier_to_locale (ident);
432 #undef LANG_HOOKS_NAME
433 #undef LANG_HOOKS_INIT
434 #undef LANG_HOOKS_OPTION_LANG_MASK
435 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
436 #undef LANG_HOOKS_HANDLE_OPTION
437 #undef LANG_HOOKS_POST_OPTIONS
438 #undef LANG_HOOKS_PARSE_FILE
439 #undef LANG_HOOKS_TYPE_FOR_MODE
440 #undef LANG_HOOKS_TYPE_FOR_SIZE
441 #undef LANG_HOOKS_BUILTIN_FUNCTION
442 #undef LANG_HOOKS_GLOBAL_BINDINGS_P
443 #undef LANG_HOOKS_PUSHDECL
444 #undef LANG_HOOKS_GETDECLS
445 #undef LANG_HOOKS_WRITE_GLOBALS
446 #undef LANG_HOOKS_GIMPLIFY_EXPR
447 #undef LANG_HOOKS_EH_PERSONALITY
449 #define LANG_HOOKS_NAME "GNU Go"
450 #define LANG_HOOKS_INIT go_langhook_init
451 #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
452 #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
453 #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
454 #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
455 #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
456 #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
457 #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
458 #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
459 #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
460 #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
461 #define LANG_HOOKS_GETDECLS go_langhook_getdecls
462 #define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals
463 #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
464 #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
466 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
468 #include "gt-go-go-lang.h"
469 #include "gtype-go.h"