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b0278d39 | 1 | /* The lang_hooks data structure. |
fd6481cf | 2 | Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
8c4c00c1 | 3 | Free Software Foundation, Inc. |
e8602e56 | 4 | |
4642865b | 5 | This file is part of GCC. |
e8602e56 | 6 | |
4642865b | 7 | GCC is free software; you can redistribute it and/or modify |
e8602e56 | 8 | it under the terms of the GNU General Public License as published by |
8c4c00c1 | 9 | the Free Software Foundation; either version 3, or (at your option) |
e8602e56 | 10 | any later version. |
11 | ||
4642865b | 12 | GCC is distributed in the hope that it will be useful, |
e8602e56 | 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
8c4c00c1 | 18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
e8602e56 | 20 | |
21 | #ifndef GCC_LANG_HOOKS_H | |
22 | #define GCC_LANG_HOOKS_H | |
23 | ||
b467ecc1 | 24 | /* This file should be #include-d after tree.h. */ |
25 | ||
6c7ff025 | 26 | struct diagnostic_context; |
b8c23db3 | 27 | struct diagnostic_info; |
6c7ff025 | 28 | |
1e8e9920 | 29 | struct gimplify_omp_ctx; |
30 | ||
1c79cc8c | 31 | struct array_descr_info; |
32 | ||
b7fced5e | 33 | /* A print hook for print_tree (). */ |
3ad4992f | 34 | typedef void (*lang_print_tree_hook) (FILE *, tree, int indent); |
b7fced5e | 35 | |
03a61d93 | 36 | enum classify_record |
37 | { RECORD_IS_STRUCT, RECORD_IS_CLASS, RECORD_IS_INTERFACE }; | |
38 | ||
b0278d39 | 39 | /* The following hooks are documented in langhooks.c. Must not be |
40 | NULL. */ | |
41 | ||
42 | struct lang_hooks_for_tree_inlining | |
43 | { | |
1f8a6ff8 | 44 | bool (*var_mod_type_p) (tree, tree); |
b0278d39 | 45 | }; |
46 | ||
833eb724 | 47 | struct lang_hooks_for_callgraph |
48 | { | |
ec1e35b2 | 49 | /* The node passed is a language-specific tree node. If its contents |
50 | are relevant to use of other declarations, mark them. */ | |
e83c4efa | 51 | tree (*analyze_expr) (tree *, int *); |
ec1e35b2 | 52 | |
e83c4efa | 53 | /* Emit thunks associated to function. */ |
84e10000 | 54 | void (*emit_associated_thunks) (tree); |
833eb724 | 55 | }; |
56 | ||
3119c950 | 57 | /* The following hooks are used by tree-dump.c. */ |
58 | ||
59 | struct lang_hooks_for_tree_dump | |
60 | { | |
6ef828f9 | 61 | /* Dump language-specific parts of tree nodes. Returns nonzero if it |
3119c950 | 62 | does not want the usual dumping of the second argument. */ |
3ad4992f | 63 | bool (*dump_tree) (void *, tree); |
3119c950 | 64 | |
65 | /* Determine type qualifiers in a language-specific way. */ | |
f8fd23c0 | 66 | int (*type_quals) (const_tree); |
3119c950 | 67 | }; |
68 | ||
a1f71e15 | 69 | /* Hooks related to types. */ |
70 | ||
71 | struct lang_hooks_for_types | |
72 | { | |
771d21fa | 73 | /* Return a new type (with the indicated CODE), doing whatever |
74 | language-specific processing is required. */ | |
3ad4992f | 75 | tree (*make_type) (enum tree_code); |
8851e806 | 76 | |
03a61d93 | 77 | /* Return what kind of RECORD_TYPE this is, mainly for purposes of |
78 | debug information. If not defined, record types are assumed to | |
79 | be structures. */ | |
80 | enum classify_record (*classify_record) (tree); | |
81 | ||
771d21fa | 82 | /* Given MODE and UNSIGNEDP, return a suitable type-tree with that |
83 | mode. */ | |
3ad4992f | 84 | tree (*type_for_mode) (enum machine_mode, int); |
771d21fa | 85 | |
86 | /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an | |
87 | integer type with at least that precision. */ | |
3ad4992f | 88 | tree (*type_for_size) (unsigned, int); |
4070745f | 89 | |
0e4744ac | 90 | /* True if the type is an instantiation of a generic type, |
91 | e.g. C++ template implicit specializations. */ | |
f8fd23c0 | 92 | bool (*generic_p) (const_tree); |
0e4744ac | 93 | |
63c62881 | 94 | /* Given a type, apply default promotions to unnamed function |
95 | arguments and return the new type. Return the same type if no | |
96 | change. Required by any language that supports variadic | |
1fa3a8f6 | 97 | arguments. The default hook dies. */ |
3ad4992f | 98 | tree (*type_promotes_to) (tree); |
63c62881 | 99 | |
b268e47e | 100 | /* Register TYPE as a builtin type with the indicated NAME. The |
101 | TYPE is placed in the outermost lexical scope. The semantics | |
102 | should be analogous to: | |
103 | ||
104 | typedef TYPE NAME; | |
105 | ||
106 | in C. The default hook ignores the declaration. */ | |
107 | void (*register_builtin_type) (tree, const char *); | |
108 | ||
1dd25100 | 109 | /* This routine is called in tree.c to print an error message for |
110 | invalid use of an incomplete type. VALUE is the expression that | |
111 | was used (or 0 if that isn't known) and TYPE is the type that was | |
112 | invalid. */ | |
f8fd23c0 | 113 | void (*incomplete_type_error) (const_tree value, const_tree type); |
a26d3281 | 114 | |
b225134e | 115 | /* Called from assign_temp to return the maximum size, if there is one, |
116 | for a type. */ | |
f8fd23c0 | 117 | tree (*max_size) (const_tree); |
b225134e | 118 | |
1e8e9920 | 119 | /* Register language specific type size variables as potentially OpenMP |
120 | firstprivate variables. */ | |
121 | void (*omp_firstprivatize_type_sizes) (struct gimplify_omp_ctx *, tree); | |
122 | ||
743f8dd1 | 123 | /* Return TRUE if TYPE1 and TYPE2 are identical for type hashing purposes. |
124 | Called only after doing all language independent checks. | |
125 | At present, this function is only called when both TYPE1 and TYPE2 are | |
126 | FUNCTION_TYPEs. */ | |
127 | bool (*type_hash_eq) (const_tree, const_tree); | |
128 | ||
1c79cc8c | 129 | /* Return TRUE if TYPE uses a hidden descriptor and fills in information |
130 | for the debugger about the array bounds, strides, etc. */ | |
131 | bool (*get_array_descr_info) (const_tree, struct array_descr_info *); | |
132 | ||
d991e6e8 | 133 | /* If we requested a pointer to a vector, build up the pointers that |
134 | we stripped off while looking for the inner type. Similarly for | |
135 | return values from functions. The argument TYPE is the top of the | |
136 | chain, and BOTTOM is the new type which we will point to. */ | |
137 | tree (*reconstruct_complex_type) (tree, tree); | |
138 | ||
a26d3281 | 139 | /* Nonzero if types that are identical are to be hashed so that only |
140 | one copy is kept. If a language requires unique types for each | |
141 | user-specified type, such as Ada, this should be set to TRUE. */ | |
142 | bool hash_types; | |
a1f71e15 | 143 | }; |
144 | ||
20325f61 | 145 | /* Language hooks related to decls and the symbol table. */ |
146 | ||
147 | struct lang_hooks_for_decls | |
148 | { | |
6ef828f9 | 149 | /* Returns nonzero if we are in the global binding level. Ada |
20325f61 | 150 | returns -1 for an undocumented reason used in stor-layout.c. */ |
3ad4992f | 151 | int (*global_bindings_p) (void); |
20325f61 | 152 | |
20325f61 | 153 | /* Function to add a decl to the current scope level. Takes one |
154 | argument, a decl to add. Returns that decl, or, if the same | |
155 | symbol is already declared, may return a different decl for that | |
156 | name. */ | |
3ad4992f | 157 | tree (*pushdecl) (tree); |
20325f61 | 158 | |
159 | /* Returns the chain of decls so far in the current scope level. */ | |
3ad4992f | 160 | tree (*getdecls) (void); |
8d58a5a7 | 161 | |
cb3582e7 | 162 | /* Returns true if DECL is explicit member function. */ |
163 | bool (*function_decl_explicit_p) (tree); | |
164 | ||
8d58a5a7 | 165 | /* Returns true when we should warn for an unused global DECL. |
166 | We will already have checked that it has static binding. */ | |
f8fd23c0 | 167 | bool (*warn_unused_global) (const_tree); |
28db4d96 | 168 | |
169 | /* Obtain a list of globals and do final output on them at end | |
170 | of compilation */ | |
3ad4992f | 171 | void (*final_write_globals) (void); |
e2e9c55b | 172 | |
173 | /* True if this decl may be called via a sibcall. */ | |
9f627b1a | 174 | bool (*ok_for_sibcall) (const_tree); |
537cd941 | 175 | |
176 | /* Return the COMDAT group into which this DECL should be placed. | |
177 | It is known that the DECL belongs in *some* COMDAT group when | |
178 | this hook is called. The return value will be used immediately, | |
179 | but not explicitly deallocated, so implementations should not use | |
180 | xmalloc to allocate the string returned. (Typically, the return | |
181 | value will be the string already stored in an | |
182 | IDENTIFIER_NODE.) */ | |
183 | const char * (*comdat_group) (tree); | |
1e8e9920 | 184 | |
185 | /* True if OpenMP should privatize what this DECL points to rather | |
186 | than the DECL itself. */ | |
9f627b1a | 187 | bool (*omp_privatize_by_reference) (const_tree); |
1e8e9920 | 188 | |
189 | /* Return sharing kind if OpenMP sharing attribute of DECL is | |
190 | predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */ | |
191 | enum omp_clause_default_kind (*omp_predetermined_sharing) (tree); | |
192 | ||
193 | /* Return true if DECL's DECL_VALUE_EXPR (if any) should be | |
194 | disregarded in OpenMP construct, because it is going to be | |
195 | remapped during OpenMP lowering. SHARED is true if DECL | |
196 | is going to be shared, false if it is going to be privatized. */ | |
197 | bool (*omp_disregard_value_expr) (tree, bool); | |
198 | ||
199 | /* Return true if DECL that is shared iff SHARED is true should | |
200 | be put into OMP_CLAUSE_PRIVATE_DEBUG. */ | |
201 | bool (*omp_private_debug_clause) (tree, bool); | |
202 | ||
fd6481cf | 203 | /* Return true if DECL in private clause needs |
204 | OMP_CLAUSE_PRIVATE_OUTER_REF on the private clause. */ | |
205 | bool (*omp_private_outer_ref) (tree); | |
206 | ||
1e8e9920 | 207 | /* Build and return code for a default constructor for DECL in |
fd6481cf | 208 | response to CLAUSE. OUTER is corresponding outer region's |
209 | variable if needed. Return NULL if nothing to be done. */ | |
210 | tree (*omp_clause_default_ctor) (tree clause, tree decl, tree outer); | |
1e8e9920 | 211 | |
212 | /* Build and return code for a copy constructor from SRC to DST. */ | |
213 | tree (*omp_clause_copy_ctor) (tree clause, tree dst, tree src); | |
214 | ||
215 | /* Similarly, except use an assignment operator instead. */ | |
216 | tree (*omp_clause_assign_op) (tree clause, tree dst, tree src); | |
217 | ||
218 | /* Build and return code destructing DECL. Return NULL if nothing | |
219 | to be done. */ | |
220 | tree (*omp_clause_dtor) (tree clause, tree decl); | |
fd6481cf | 221 | |
222 | /* Do language specific checking on an implicitly determined clause. */ | |
223 | void (*omp_finish_clause) (tree clause); | |
20325f61 | 224 | }; |
225 | ||
b0278d39 | 226 | /* Language-specific hooks. See langhooks-def.h for defaults. */ |
227 | ||
228 | struct lang_hooks | |
229 | { | |
d19bd1f0 | 230 | /* String identifying the front end. e.g. "GNU C++". */ |
231 | const char *name; | |
232 | ||
233 | /* sizeof (struct lang_identifier), so make_node () creates | |
234 | identifier nodes long enough for the language-specific slots. */ | |
235 | size_t identifier_size; | |
236 | ||
ce45a448 | 237 | /* Determines the size of any language-specific tcc_constant or |
238 | tcc_exceptional nodes. Since it is called from make_node, the | |
1fa3a8f6 | 239 | only information available is the tree code. Expected to die |
ce45a448 | 240 | on unrecognized codes. */ |
3ad4992f | 241 | size_t (*tree_size) (enum tree_code); |
295e387a | 242 | |
435fb09b | 243 | /* The first callback made to the front end, for simple |
5457b645 | 244 | initialization needed before any calls to handle_option. Return |
245 | the language mask to filter the switch array with. */ | |
4838a8b6 | 246 | unsigned int (*init_options) (unsigned int argc, const char **argv); |
b0278d39 | 247 | |
f63da8d3 | 248 | /* Callback used to perform language-specific initialization for the |
249 | global diagnostic context structure. */ | |
250 | void (*initialize_diagnostics) (struct diagnostic_context *); | |
251 | ||
5457b645 | 252 | /* Handle the switch CODE, which has real type enum opt_code from |
253 | options.h. If the switch takes an argument, it is passed in ARG | |
917bbcab | 254 | which points to permanent storage. The handler is responsible for |
5457b645 | 255 | checking whether ARG is NULL, which indicates that no argument |
256 | was in fact supplied. For -f and -W switches, VALUE is 1 or 0 | |
257 | for the positive and negative forms respectively. | |
258 | ||
259 | Return 1 if the switch is valid, 0 if invalid, and -1 if it's | |
260 | valid and should not be treated as language-independent too. */ | |
261 | int (*handle_option) (size_t code, const char *arg, int value); | |
262 | ||
76bf7746 | 263 | /* Return false to use the default complaint about a missing |
264 | argument, otherwise output a complaint and return true. */ | |
265 | bool (*missing_argument) (const char *opt, size_t code); | |
266 | ||
03bde601 | 267 | /* Called when all command line options have been parsed to allow |
268 | further processing and initialization | |
dd436eaf | 269 | |
03bde601 | 270 | Should return true to indicate that a compiler back-end is |
271 | not required, such as with the -E option. | |
3ad4992f | 272 | |
6ef828f9 | 273 | If errorcount is nonzero after this call the compiler exits |
dd436eaf | 274 | immediately and the finish hook is not called. */ |
3ad4992f | 275 | bool (*post_options) (const char **); |
03bde601 | 276 | |
277 | /* Called after post_options to initialize the front end. Return | |
278 | false to indicate that no further compilation be performed, in | |
279 | which case the finish hook is called immediately. */ | |
3ad4992f | 280 | bool (*init) (void); |
435fb09b | 281 | |
282 | /* Called at the end of compilation, as a finalizer. */ | |
3ad4992f | 283 | void (*finish) (void); |
435fb09b | 284 | |
6ef828f9 | 285 | /* Parses the entire file. The argument is nonzero to cause bison |
1c542e4c | 286 | parsers to dump debugging information during parsing. */ |
3ad4992f | 287 | void (*parse_file) (int); |
b78207a0 | 288 | |
b75409ba | 289 | /* Determines if it's ok for a function to have no noreturn attribute. */ |
290 | bool (*missing_noreturn_ok_p) (tree); | |
291 | ||
b0278d39 | 292 | /* Called to obtain the alias set to be used for an expression or type. |
293 | Returns -1 if the language does nothing special for it. */ | |
32c2fdea | 294 | alias_set_type (*get_alias_set) (tree); |
b0278d39 | 295 | |
ee23fd7b | 296 | /* Function to finish handling an incomplete decl at the end of |
297 | compilation. Default hook is does nothing. */ | |
3ad4992f | 298 | void (*finish_incomplete_decl) (tree); |
ee23fd7b | 299 | |
9b86eec0 | 300 | /* Mark EXP saying that we need to be able to take the address of |
301 | it; it should not be allocated in a register. Return true if | |
302 | successful. */ | |
3ad4992f | 303 | bool (*mark_addressable) (tree); |
9b86eec0 | 304 | |
dbc42b78 | 305 | /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the |
306 | DECL_NODE with a newly GC-allocated copy. */ | |
3ad4992f | 307 | void (*dup_lang_specific_decl) (tree); |
dbc42b78 | 308 | |
d1f6c8f2 | 309 | /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of |
310 | thing that the assembler should talk about, set | |
311 | DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE. | |
312 | Otherwise, set it to the ERROR_MARK_NODE to ensure that the | |
313 | assembler does not talk about it. */ | |
3ad4992f | 314 | void (*set_decl_assembler_name) (tree); |
d1f6c8f2 | 315 | |
b7fced5e | 316 | /* The front end can add its own statistics to -fmem-report with |
317 | this hook. It should output to stderr. */ | |
3ad4992f | 318 | void (*print_statistics) (void); |
b7fced5e | 319 | |
ce45a448 | 320 | /* Called by print_tree when there is a tree of class tcc_exceptional |
321 | that it doesn't know how to display. */ | |
b7fced5e | 322 | lang_print_tree_hook print_xnode; |
323 | ||
ce45a448 | 324 | /* Called to print language-dependent parts of tcc_decl, tcc_type, |
325 | and IDENTIFIER_NODE nodes. */ | |
b7fced5e | 326 | lang_print_tree_hook print_decl; |
327 | lang_print_tree_hook print_type; | |
328 | lang_print_tree_hook print_identifier; | |
329 | ||
96554925 | 330 | /* Computes the name to use to print a declaration. DECL is the |
331 | non-NULL declaration in question. VERBOSITY determines what | |
332 | information will be printed: 0: DECL_NAME, demangled as | |
333 | necessary. 1: and scope information. 2: and any other | |
334 | information that might be interesting, such as function parameter | |
335 | types in C++. */ | |
3ad4992f | 336 | const char *(*decl_printable_name) (tree decl, int verbosity); |
96554925 | 337 | |
7d709201 | 338 | /* Computes the dwarf-2/3 name for a tree. VERBOSITY determines what |
339 | information will be printed: 0: DECL_NAME, demangled as | |
340 | necessary. 1: and scope information. */ | |
341 | const char *(*dwarf_name) (tree, int verbosity); | |
342 | ||
4ee9c684 | 343 | /* This compares two types for equivalence ("compatible" in C-based languages). |
344 | This routine should only return 1 if it is sure. It should not be used | |
345 | in contexts where erroneously returning 0 causes problems. */ | |
346 | int (*types_compatible_p) (tree x, tree y); | |
347 | ||
6c7ff025 | 348 | /* Called by report_error_function to print out function name. */ |
b8c23db3 | 349 | void (*print_error_function) (struct diagnostic_context *, const char *, |
350 | struct diagnostic_info *); | |
6c7ff025 | 351 | |
c3f16ae3 | 352 | /* Called from expr_size to calculate the size of the value of an |
353 | expression in a language-dependent way. Returns a tree for the size | |
354 | in bytes. A frontend can call lhd_expr_size to get the default | |
355 | semantics in cases that it doesn't want to handle specially. */ | |
f8fd23c0 | 356 | tree (*expr_size) (const_tree); |
c3f16ae3 | 357 | |
624d37a6 | 358 | /* Convert a character from the host's to the target's character |
359 | set. The character should be in what C calls the "basic source | |
360 | character set" (roughly, the set of characters defined by plain | |
361 | old ASCII). The default is to return the character unchanged, | |
362 | which is correct in most circumstances. Note that both argument | |
363 | and result should be sign-extended under -fsigned-char, | |
364 | zero-extended under -fno-signed-char. */ | |
365 | HOST_WIDE_INT (*to_target_charset) (HOST_WIDE_INT); | |
366 | ||
f8e93a2e | 367 | /* Pointers to machine-independent attribute tables, for front ends |
368 | using attribs.c. If one is NULL, it is ignored. Respectively, a | |
369 | table of attributes specific to the language, a table of | |
370 | attributes common to two or more languages (to allow easy | |
371 | sharing), and a table of attributes for checking formats. */ | |
372 | const struct attribute_spec *attribute_table; | |
373 | const struct attribute_spec *common_attribute_table; | |
374 | const struct attribute_spec *format_attribute_table; | |
375 | ||
b0278d39 | 376 | struct lang_hooks_for_tree_inlining tree_inlining; |
8851e806 | 377 | |
833eb724 | 378 | struct lang_hooks_for_callgraph callgraph; |
379 | ||
3119c950 | 380 | struct lang_hooks_for_tree_dump tree_dump; |
b0278d39 | 381 | |
20325f61 | 382 | struct lang_hooks_for_decls decls; |
383 | ||
a1f71e15 | 384 | struct lang_hooks_for_types types; |
385 | ||
4ee9c684 | 386 | /* Perform language-specific gimplification on the argument. Returns an |
387 | enum gimplify_status, though we can't see that type here. */ | |
75a70cf9 | 388 | int (*gimplify_expr) (tree *, gimple_seq *, gimple_seq *); |
4ee9c684 | 389 | |
215e2f1d | 390 | /* Fold an OBJ_TYPE_REF expression to the address of a function. |
391 | KNOWN_TYPE carries the true type of the OBJ_TYPE_REF_OBJECT. */ | |
392 | tree (*fold_obj_type_ref) (tree, tree); | |
393 | ||
54be5d7e | 394 | /* Do language specific processing in the builtin function DECL */ |
395 | tree (*builtin_function) (tree decl); | |
e60d3615 | 396 | |
24470055 | 397 | /* Like builtin_function, but make sure the scope is the external scope. |
398 | This is used to delay putting in back end builtin functions until the ISA | |
399 | that defines the builtin is declared via function specific target options, | |
400 | which can save memory for machines like the x86_64 that have multiple | |
401 | ISAs. If this points to the same function as builtin_function, the | |
402 | backend must add all of the builtins at program initialization time. */ | |
403 | tree (*builtin_function_ext_scope) (tree decl); | |
404 | ||
5ded8c6f | 405 | /* Used to set up the tree_contains_structure array for a frontend. */ |
406 | void (*init_ts) (void); | |
407 | ||
750ad201 | 408 | /* Called by recompute_tree_invariant_for_addr_expr to go from EXPR |
c7d4e749 | 409 | to a contained expression or DECL, possibly updating *TC or *SE |
410 | if in the process TREE_CONSTANT or TREE_SIDE_EFFECTS need updating. */ | |
411 | tree (*expr_to_decl) (tree expr, bool *tc, bool *se); | |
54d7165a | 412 | |
3119c950 | 413 | /* Whenever you add entries here, make sure you adjust langhooks-def.h |
b0278d39 | 414 | and langhooks.c accordingly. */ |
415 | }; | |
416 | ||
417 | /* Each front end provides its own. */ | |
d19bd1f0 | 418 | extern const struct lang_hooks lang_hooks; |
54be5d7e | 419 | extern tree add_builtin_function (const char *name, tree type, |
420 | int function_code, enum built_in_class cl, | |
421 | const char *library_name, | |
422 | tree attrs); | |
e8602e56 | 423 | |
24470055 | 424 | extern tree add_builtin_function_ext_scope (const char *name, tree type, |
425 | int function_code, | |
426 | enum built_in_class cl, | |
427 | const char *library_name, | |
428 | tree attrs); | |
429 | ||
e8602e56 | 430 | #endif /* GCC_LANG_HOOKS_H */ |