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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 /* The lang_hooks data structure.
2 Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 GCC is distributed in the hope that it will be useful,
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
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #ifndef GCC_LANG_HOOKS_H
22 #define GCC_LANG_HOOKS_H
23
24 /* This file should be #include-d after tree.h. */
25
26 struct diagnostic_context;
27 struct diagnostic_info;
28
29 struct gimplify_omp_ctx;
30
31 struct array_descr_info;
32
33 /* A print hook for print_tree (). */
34 typedef void (*lang_print_tree_hook) (FILE *, tree, int indent);
35
36 enum classify_record
37 { RECORD_IS_STRUCT, RECORD_IS_CLASS, RECORD_IS_INTERFACE };
38
39 /* The following hooks are documented in langhooks.c. Must not be
40 NULL. */
41
42 struct lang_hooks_for_tree_inlining
43 {
44 bool (*var_mod_type_p) (tree, tree);
45 };
46
47 struct lang_hooks_for_callgraph
48 {
49 /* The node passed is a language-specific tree node. If its contents
50 are relevant to use of other declarations, mark them. */
51 tree (*analyze_expr) (tree *, int *);
52
53 /* Emit thunks associated to function. */
54 void (*emit_associated_thunks) (tree);
55 };
56
57 /* The following hooks are used by tree-dump.c. */
58
59 struct lang_hooks_for_tree_dump
60 {
61 /* Dump language-specific parts of tree nodes. Returns nonzero if it
62 does not want the usual dumping of the second argument. */
63 bool (*dump_tree) (void *, tree);
64
65 /* Determine type qualifiers in a language-specific way. */
66 int (*type_quals) (const_tree);
67 };
68
69 /* Hooks related to types. */
70
71 struct lang_hooks_for_types
72 {
73 /* Return a new type (with the indicated CODE), doing whatever
74 language-specific processing is required. */
75 tree (*make_type) (enum tree_code);
76
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
82 /* Given MODE and UNSIGNEDP, return a suitable type-tree with that
83 mode. */
84 tree (*type_for_mode) (enum machine_mode, int);
85
86 /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an
87 integer type with at least that precision. */
88 tree (*type_for_size) (unsigned, int);
89
90 /* True if the type is an instantiation of a generic type,
91 e.g. C++ template implicit specializations. */
92 bool (*generic_p) (const_tree);
93
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
97 arguments. The default hook dies. */
98 tree (*type_promotes_to) (tree);
99
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
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. */
113 void (*incomplete_type_error) (const_tree value, const_tree type);
114
115 /* Called from assign_temp to return the maximum size, if there is one,
116 for a type. */
117 tree (*max_size) (const_tree);
118
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
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
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
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
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;
143 };
144
145 /* Language hooks related to decls and the symbol table. */
146
147 struct lang_hooks_for_decls
148 {
149 /* Returns nonzero if we are in the global binding level. Ada
150 returns -1 for an undocumented reason used in stor-layout.c. */
151 int (*global_bindings_p) (void);
152
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. */
157 tree (*pushdecl) (tree);
158
159 /* Returns the chain of decls so far in the current scope level. */
160 tree (*getdecls) (void);
161
162 /* Returns true when we should warn for an unused global DECL.
163 We will already have checked that it has static binding. */
164 bool (*warn_unused_global) (const_tree);
165
166 /* Obtain a list of globals and do final output on them at end
167 of compilation */
168 void (*final_write_globals) (void);
169
170 /* True if this decl may be called via a sibcall. */
171 bool (*ok_for_sibcall) (const_tree);
172
173 /* Return the COMDAT group into which this DECL should be placed.
174 It is known that the DECL belongs in *some* COMDAT group when
175 this hook is called. The return value will be used immediately,
176 but not explicitly deallocated, so implementations should not use
177 xmalloc to allocate the string returned. (Typically, the return
178 value will be the string already stored in an
179 IDENTIFIER_NODE.) */
180 const char * (*comdat_group) (tree);
181
182 /* True if OpenMP should privatize what this DECL points to rather
183 than the DECL itself. */
184 bool (*omp_privatize_by_reference) (const_tree);
185
186 /* Return sharing kind if OpenMP sharing attribute of DECL is
187 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
188 enum omp_clause_default_kind (*omp_predetermined_sharing) (tree);
189
190 /* Return true if DECL's DECL_VALUE_EXPR (if any) should be
191 disregarded in OpenMP construct, because it is going to be
192 remapped during OpenMP lowering. SHARED is true if DECL
193 is going to be shared, false if it is going to be privatized. */
194 bool (*omp_disregard_value_expr) (tree, bool);
195
196 /* Return true if DECL that is shared iff SHARED is true should
197 be put into OMP_CLAUSE_PRIVATE_DEBUG. */
198 bool (*omp_private_debug_clause) (tree, bool);
199
200 /* Return true if DECL in private clause needs
201 OMP_CLAUSE_PRIVATE_OUTER_REF on the private clause. */
202 bool (*omp_private_outer_ref) (tree);
203
204 /* Build and return code for a default constructor for DECL in
205 response to CLAUSE. OUTER is corresponding outer region's
206 variable if needed. Return NULL if nothing to be done. */
207 tree (*omp_clause_default_ctor) (tree clause, tree decl, tree outer);
208
209 /* Build and return code for a copy constructor from SRC to DST. */
210 tree (*omp_clause_copy_ctor) (tree clause, tree dst, tree src);
211
212 /* Similarly, except use an assignment operator instead. */
213 tree (*omp_clause_assign_op) (tree clause, tree dst, tree src);
214
215 /* Build and return code destructing DECL. Return NULL if nothing
216 to be done. */
217 tree (*omp_clause_dtor) (tree clause, tree decl);
218
219 /* Do language specific checking on an implicitly determined clause. */
220 void (*omp_finish_clause) (tree clause);
221 };
222
223 /* Language-specific hooks. See langhooks-def.h for defaults. */
224
225 struct lang_hooks
226 {
227 /* String identifying the front end. e.g. "GNU C++". */
228 const char *name;
229
230 /* sizeof (struct lang_identifier), so make_node () creates
231 identifier nodes long enough for the language-specific slots. */
232 size_t identifier_size;
233
234 /* Determines the size of any language-specific tcc_constant or
235 tcc_exceptional nodes. Since it is called from make_node, the
236 only information available is the tree code. Expected to die
237 on unrecognized codes. */
238 size_t (*tree_size) (enum tree_code);
239
240 /* The first callback made to the front end, for simple
241 initialization needed before any calls to handle_option. Return
242 the language mask to filter the switch array with. */
243 unsigned int (*init_options) (unsigned int argc, const char **argv);
244
245 /* Callback used to perform language-specific initialization for the
246 global diagnostic context structure. */
247 void (*initialize_diagnostics) (struct diagnostic_context *);
248
249 /* Handle the switch CODE, which has real type enum opt_code from
250 options.h. If the switch takes an argument, it is passed in ARG
251 which points to permanent storage. The handler is responsible for
252 checking whether ARG is NULL, which indicates that no argument
253 was in fact supplied. For -f and -W switches, VALUE is 1 or 0
254 for the positive and negative forms respectively.
255
256 Return 1 if the switch is valid, 0 if invalid, and -1 if it's
257 valid and should not be treated as language-independent too. */
258 int (*handle_option) (size_t code, const char *arg, int value);
259
260 /* Return false to use the default complaint about a missing
261 argument, otherwise output a complaint and return true. */
262 bool (*missing_argument) (const char *opt, size_t code);
263
264 /* Called when all command line options have been parsed to allow
265 further processing and initialization
266
267 Should return true to indicate that a compiler back-end is
268 not required, such as with the -E option.
269
270 If errorcount is nonzero after this call the compiler exits
271 immediately and the finish hook is not called. */
272 bool (*post_options) (const char **);
273
274 /* Called after post_options to initialize the front end. Return
275 false to indicate that no further compilation be performed, in
276 which case the finish hook is called immediately. */
277 bool (*init) (void);
278
279 /* Called at the end of compilation, as a finalizer. */
280 void (*finish) (void);
281
282 /* Parses the entire file. The argument is nonzero to cause bison
283 parsers to dump debugging information during parsing. */
284 void (*parse_file) (int);
285
286 /* Determines if it's ok for a function to have no noreturn attribute. */
287 bool (*missing_noreturn_ok_p) (tree);
288
289 /* Called to obtain the alias set to be used for an expression or type.
290 Returns -1 if the language does nothing special for it. */
291 alias_set_type (*get_alias_set) (tree);
292
293 /* Called by expand_expr for language-specific tree codes.
294 Fourth argument is actually an enum expand_modifier. */
295 rtx (*expand_expr) (tree, rtx, enum machine_mode, int, rtx *);
296
297 /* Function to finish handling an incomplete decl at the end of
298 compilation. Default hook is does nothing. */
299 void (*finish_incomplete_decl) (tree);
300
301 /* Mark EXP saying that we need to be able to take the address of
302 it; it should not be allocated in a register. Return true if
303 successful. */
304 bool (*mark_addressable) (tree);
305
306 /* Hook called by staticp for language-specific tree codes. */
307 tree (*staticp) (tree);
308
309 /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
310 DECL_NODE with a newly GC-allocated copy. */
311 void (*dup_lang_specific_decl) (tree);
312
313 /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of
314 thing that the assembler should talk about, set
315 DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE.
316 Otherwise, set it to the ERROR_MARK_NODE to ensure that the
317 assembler does not talk about it. */
318 void (*set_decl_assembler_name) (tree);
319
320 /* The front end can add its own statistics to -fmem-report with
321 this hook. It should output to stderr. */
322 void (*print_statistics) (void);
323
324 /* Called by print_tree when there is a tree of class tcc_exceptional
325 that it doesn't know how to display. */
326 lang_print_tree_hook print_xnode;
327
328 /* Called to print language-dependent parts of tcc_decl, tcc_type,
329 and IDENTIFIER_NODE nodes. */
330 lang_print_tree_hook print_decl;
331 lang_print_tree_hook print_type;
332 lang_print_tree_hook print_identifier;
333
334 /* Computes the name to use to print a declaration. DECL is the
335 non-NULL declaration in question. VERBOSITY determines what
336 information will be printed: 0: DECL_NAME, demangled as
337 necessary. 1: and scope information. 2: and any other
338 information that might be interesting, such as function parameter
339 types in C++. */
340 const char *(*decl_printable_name) (tree decl, int verbosity);
341
342 /* Computes the dwarf-2/3 name for a tree. VERBOSITY determines what
343 information will be printed: 0: DECL_NAME, demangled as
344 necessary. 1: and scope information. */
345 const char *(*dwarf_name) (tree, int verbosity);
346
347 /* This compares two types for equivalence ("compatible" in C-based languages).
348 This routine should only return 1 if it is sure. It should not be used
349 in contexts where erroneously returning 0 causes problems. */
350 int (*types_compatible_p) (tree x, tree y);
351
352 /* Called by report_error_function to print out function name. */
353 void (*print_error_function) (struct diagnostic_context *, const char *,
354 struct diagnostic_info *);
355
356 /* Called from expr_size to calculate the size of the value of an
357 expression in a language-dependent way. Returns a tree for the size
358 in bytes. A frontend can call lhd_expr_size to get the default
359 semantics in cases that it doesn't want to handle specially. */
360 tree (*expr_size) (const_tree);
361
362 /* Convert a character from the host's to the target's character
363 set. The character should be in what C calls the "basic source
364 character set" (roughly, the set of characters defined by plain
365 old ASCII). The default is to return the character unchanged,
366 which is correct in most circumstances. Note that both argument
367 and result should be sign-extended under -fsigned-char,
368 zero-extended under -fno-signed-char. */
369 HOST_WIDE_INT (*to_target_charset) (HOST_WIDE_INT);
370
371 /* Pointers to machine-independent attribute tables, for front ends
372 using attribs.c. If one is NULL, it is ignored. Respectively, a
373 table of attributes specific to the language, a table of
374 attributes common to two or more languages (to allow easy
375 sharing), and a table of attributes for checking formats. */
376 const struct attribute_spec *attribute_table;
377 const struct attribute_spec *common_attribute_table;
378 const struct attribute_spec *format_attribute_table;
379
380 struct lang_hooks_for_tree_inlining tree_inlining;
381
382 struct lang_hooks_for_callgraph callgraph;
383
384 struct lang_hooks_for_tree_dump tree_dump;
385
386 struct lang_hooks_for_decls decls;
387
388 struct lang_hooks_for_types types;
389
390 /* Perform language-specific gimplification on the argument. Returns an
391 enum gimplify_status, though we can't see that type here. */
392 int (*gimplify_expr) (tree *, gimple_seq *, gimple_seq *);
393
394 /* Fold an OBJ_TYPE_REF expression to the address of a function.
395 KNOWN_TYPE carries the true type of the OBJ_TYPE_REF_OBJECT. */
396 tree (*fold_obj_type_ref) (tree, tree);
397
398 /* Do language specific processing in the builtin function DECL */
399 tree (*builtin_function) (tree decl);
400
401 /* Like builtin_function, but make sure the scope is the external scope.
402 This is used to delay putting in back end builtin functions until the ISA
403 that defines the builtin is declared via function specific target options,
404 which can save memory for machines like the x86_64 that have multiple
405 ISAs. If this points to the same function as builtin_function, the
406 backend must add all of the builtins at program initialization time. */
407 tree (*builtin_function_ext_scope) (tree decl);
408
409 /* Used to set up the tree_contains_structure array for a frontend. */
410 void (*init_ts) (void);
411
412 /* Called by recompute_tree_invariant_for_addr_expr to go from EXPR
413 to a contained expression or DECL, possibly updating *TC or *SE
414 if in the process TREE_CONSTANT or TREE_SIDE_EFFECTS need updating. */
415 tree (*expr_to_decl) (tree expr, bool *tc, bool *se);
416
417 /* Whenever you add entries here, make sure you adjust langhooks-def.h
418 and langhooks.c accordingly. */
419 };
420
421 /* Each front end provides its own. */
422 extern const struct lang_hooks lang_hooks;
423 extern tree add_builtin_function (const char *name, tree type,
424 int function_code, enum built_in_class cl,
425 const char *library_name,
426 tree attrs);
427
428 extern tree add_builtin_function_ext_scope (const char *name, tree type,
429 int function_code,
430 enum built_in_class cl,
431 const char *library_name,
432 tree attrs);
433
434 #endif /* GCC_LANG_HOOKS_H */