1 /* The lang_hooks data structure.
2 Copyright 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING. If not, write to
18 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
19 Boston, MA 02110-1301, USA. */
21 #ifndef GCC_LANG_HOOKS_H
22 #define GCC_LANG_HOOKS_H
24 /* This file should be #include-d after tree.h. */
26 struct diagnostic_context;
28 struct gimplify_omp_ctx;
30 /* A print hook for print_tree (). */
31 typedef void (*lang_print_tree_hook) (FILE *, tree, int indent);
33 /* The following hooks are documented in langhooks.c. Must not be
36 struct lang_hooks_for_tree_inlining
38 tree (*walk_subtrees) (tree *, int *,
39 tree (*) (tree *, int *, void *),
40 void *, struct pointer_set_t*);
41 int (*cannot_inline_tree_fn) (tree *);
42 int (*disregard_inline_limits) (tree);
43 int (*auto_var_in_fn_p) (tree, tree);
44 bool (*var_mod_type_p) (tree, tree);
45 tree (*convert_parm_for_inlining) (tree, tree, tree, int);
48 struct lang_hooks_for_callgraph
50 /* The node passed is a language-specific tree node. If its contents
51 are relevant to use of other declarations, mark them. */
52 tree (*analyze_expr) (tree *, int *, tree);
54 /* Produce RTL for function passed as argument. */
55 void (*expand_function) (tree);
58 /* Lang hooks for management of language-specific data or status
59 when entering / leaving functions etc. */
60 struct lang_hooks_for_functions
62 /* Called when entering a function. */
63 void (*init) (struct function *);
65 /* Called when leaving a function. */
66 void (*final) (struct function *);
68 /* Called when entering a nested function. */
69 void (*enter_nested) (struct function *);
71 /* Called when leaving a nested function. */
72 void (*leave_nested) (struct function *);
74 /* Determines if it's ok for a function to have no noreturn attribute. */
75 bool (*missing_noreturn_ok_p) (tree);
78 /* The following hooks are used by tree-dump.c. */
80 struct lang_hooks_for_tree_dump
82 /* Dump language-specific parts of tree nodes. Returns nonzero if it
83 does not want the usual dumping of the second argument. */
84 bool (*dump_tree) (void *, tree);
86 /* Determine type qualifiers in a language-specific way. */
87 int (*type_quals) (tree);
90 /* Hooks related to types. */
92 struct lang_hooks_for_types
94 /* Return a new type (with the indicated CODE), doing whatever
95 language-specific processing is required. */
96 tree (*make_type) (enum tree_code);
98 /* Given MODE and UNSIGNEDP, return a suitable type-tree with that
100 tree (*type_for_mode) (enum machine_mode, int);
102 /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an
103 integer type with at least that precision. */
104 tree (*type_for_size) (unsigned, int);
106 /* Given an integer type T, return a type like T but unsigned.
107 If T is unsigned, the value is T. */
108 tree (*unsigned_type) (tree);
110 /* Given an integer type T, return a type like T but signed.
111 If T is signed, the value is T. */
112 tree (*signed_type) (tree);
114 /* Return a type the same as TYPE except unsigned or signed
115 according to UNSIGNEDP. */
116 tree (*signed_or_unsigned_type) (int, tree);
118 /* Given a type, apply default promotions to unnamed function
119 arguments and return the new type. Return the same type if no
120 change. Required by any language that supports variadic
121 arguments. The default hook dies. */
122 tree (*type_promotes_to) (tree);
124 /* Register TYPE as a builtin type with the indicated NAME. The
125 TYPE is placed in the outermost lexical scope. The semantics
126 should be analogous to:
130 in C. The default hook ignores the declaration. */
131 void (*register_builtin_type) (tree, const char *);
133 /* This routine is called in tree.c to print an error message for
134 invalid use of an incomplete type. VALUE is the expression that
135 was used (or 0 if that isn't known) and TYPE is the type that was
137 void (*incomplete_type_error) (tree value, tree type);
139 /* Called from assign_temp to return the maximum size, if there is one,
141 tree (*max_size) (tree);
143 /* Register language specific type size variables as potentially OpenMP
144 firstprivate variables. */
145 void (*omp_firstprivatize_type_sizes) (struct gimplify_omp_ctx *, tree);
147 /* Nonzero if types that are identical are to be hashed so that only
148 one copy is kept. If a language requires unique types for each
149 user-specified type, such as Ada, this should be set to TRUE. */
153 /* Language hooks related to decls and the symbol table. */
155 struct lang_hooks_for_decls
157 /* Returns nonzero if we are in the global binding level. Ada
158 returns -1 for an undocumented reason used in stor-layout.c. */
159 int (*global_bindings_p) (void);
161 /* Insert BLOCK at the end of the list of subblocks of the
162 current binding level. This is used when a BIND_EXPR is expanded,
163 to handle the BLOCK node inside the BIND_EXPR. */
164 void (*insert_block) (tree);
166 /* Function to add a decl to the current scope level. Takes one
167 argument, a decl to add. Returns that decl, or, if the same
168 symbol is already declared, may return a different decl for that
170 tree (*pushdecl) (tree);
172 /* Returns the chain of decls so far in the current scope level. */
173 tree (*getdecls) (void);
175 /* Returns true when we should warn for an unused global DECL.
176 We will already have checked that it has static binding. */
177 bool (*warn_unused_global) (tree);
179 /* Obtain a list of globals and do final output on them at end
181 void (*final_write_globals) (void);
183 /* True if this decl may be called via a sibcall. */
184 bool (*ok_for_sibcall) (tree);
186 /* Return the COMDAT group into which this DECL should be placed.
187 It is known that the DECL belongs in *some* COMDAT group when
188 this hook is called. The return value will be used immediately,
189 but not explicitly deallocated, so implementations should not use
190 xmalloc to allocate the string returned. (Typically, the return
191 value will be the string already stored in an
193 const char * (*comdat_group) (tree);
195 /* True if OpenMP should privatize what this DECL points to rather
196 than the DECL itself. */
197 bool (*omp_privatize_by_reference) (tree);
199 /* Return sharing kind if OpenMP sharing attribute of DECL is
200 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
201 enum omp_clause_default_kind (*omp_predetermined_sharing) (tree);
203 /* Return true if DECL's DECL_VALUE_EXPR (if any) should be
204 disregarded in OpenMP construct, because it is going to be
205 remapped during OpenMP lowering. SHARED is true if DECL
206 is going to be shared, false if it is going to be privatized. */
207 bool (*omp_disregard_value_expr) (tree, bool);
209 /* Return true if DECL that is shared iff SHARED is true should
210 be put into OMP_CLAUSE_PRIVATE_DEBUG. */
211 bool (*omp_private_debug_clause) (tree, bool);
213 /* Build and return code for a default constructor for DECL in
214 response to CLAUSE. Return NULL if nothing to be done. */
215 tree (*omp_clause_default_ctor) (tree clause, tree decl);
217 /* Build and return code for a copy constructor from SRC to DST. */
218 tree (*omp_clause_copy_ctor) (tree clause, tree dst, tree src);
220 /* Similarly, except use an assignment operator instead. */
221 tree (*omp_clause_assign_op) (tree clause, tree dst, tree src);
223 /* Build and return code destructing DECL. Return NULL if nothing
225 tree (*omp_clause_dtor) (tree clause, tree decl);
228 /* Language-specific hooks. See langhooks-def.h for defaults. */
232 /* String identifying the front end. e.g. "GNU C++". */
235 /* sizeof (struct lang_identifier), so make_node () creates
236 identifier nodes long enough for the language-specific slots. */
237 size_t identifier_size;
239 /* Determines the size of any language-specific tcc_constant or
240 tcc_exceptional nodes. Since it is called from make_node, the
241 only information available is the tree code. Expected to die
242 on unrecognized codes. */
243 size_t (*tree_size) (enum tree_code);
245 /* The first callback made to the front end, for simple
246 initialization needed before any calls to handle_option. Return
247 the language mask to filter the switch array with. */
248 unsigned int (*init_options) (unsigned int argc, const char **argv);
250 /* Callback used to perform language-specific initialization for the
251 global diagnostic context structure. */
252 void (*initialize_diagnostics) (struct diagnostic_context *);
254 /* Handle the switch CODE, which has real type enum opt_code from
255 options.h. If the switch takes an argument, it is passed in ARG
256 which points to permanent storage. The handler is responsible for
257 checking whether ARG is NULL, which indicates that no argument
258 was in fact supplied. For -f and -W switches, VALUE is 1 or 0
259 for the positive and negative forms respectively.
261 Return 1 if the switch is valid, 0 if invalid, and -1 if it's
262 valid and should not be treated as language-independent too. */
263 int (*handle_option) (size_t code, const char *arg, int value);
265 /* Return false to use the default complaint about a missing
266 argument, otherwise output a complaint and return true. */
267 bool (*missing_argument) (const char *opt, size_t code);
269 /* Called when all command line options have been parsed to allow
270 further processing and initialization
272 Should return true to indicate that a compiler back-end is
273 not required, such as with the -E option.
275 If errorcount is nonzero after this call the compiler exits
276 immediately and the finish hook is not called. */
277 bool (*post_options) (const char **);
279 /* Called after post_options to initialize the front end. Return
280 false to indicate that no further compilation be performed, in
281 which case the finish hook is called immediately. */
284 /* Called at the end of compilation, as a finalizer. */
285 void (*finish) (void);
287 /* Parses the entire file. The argument is nonzero to cause bison
288 parsers to dump debugging information during parsing. */
289 void (*parse_file) (int);
291 /* Called immediately after parsing to clear the binding stack. */
292 void (*clear_binding_stack) (void);
294 /* Called to obtain the alias set to be used for an expression or type.
295 Returns -1 if the language does nothing special for it. */
296 HOST_WIDE_INT (*get_alias_set) (tree);
298 /* Called with an expression that is to be processed as a constant.
299 Returns either the same expression or a language-independent
300 constant equivalent to its input. */
301 tree (*expand_constant) (tree);
303 /* Called by expand_expr for language-specific tree codes.
304 Fourth argument is actually an enum expand_modifier. */
305 rtx (*expand_expr) (tree, rtx, enum machine_mode, int, rtx *);
307 /* Called by expand_expr to generate the definition of a decl. Returns
308 1 if handled, 0 otherwise. */
309 int (*expand_decl) (tree);
311 /* Function to finish handling an incomplete decl at the end of
312 compilation. Default hook is does nothing. */
313 void (*finish_incomplete_decl) (tree);
315 /* Mark EXP saying that we need to be able to take the address of
316 it; it should not be allocated in a register. Return true if
318 bool (*mark_addressable) (tree);
320 /* Hook called by staticp for language-specific tree codes. */
321 tree (*staticp) (tree);
323 /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
324 DECL_NODE with a newly GC-allocated copy. */
325 void (*dup_lang_specific_decl) (tree);
327 /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of
328 thing that the assembler should talk about, set
329 DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE.
330 Otherwise, set it to the ERROR_MARK_NODE to ensure that the
331 assembler does not talk about it. */
332 void (*set_decl_assembler_name) (tree);
334 /* Nonzero if operations on types narrower than their mode should
335 have their results reduced to the precision of the type. */
336 bool reduce_bit_field_operations;
338 /* Nonzero if this front end does not generate a dummy BLOCK between
339 the outermost scope of the function and the FUNCTION_DECL. See
340 is_body_block in stmt.c, and its callers. */
343 /* The front end can add its own statistics to -fmem-report with
344 this hook. It should output to stderr. */
345 void (*print_statistics) (void);
347 /* Called by print_tree when there is a tree of class tcc_exceptional
348 that it doesn't know how to display. */
349 lang_print_tree_hook print_xnode;
351 /* Called to print language-dependent parts of tcc_decl, tcc_type,
352 and IDENTIFIER_NODE nodes. */
353 lang_print_tree_hook print_decl;
354 lang_print_tree_hook print_type;
355 lang_print_tree_hook print_identifier;
357 /* Computes the name to use to print a declaration. DECL is the
358 non-NULL declaration in question. VERBOSITY determines what
359 information will be printed: 0: DECL_NAME, demangled as
360 necessary. 1: and scope information. 2: and any other
361 information that might be interesting, such as function parameter
363 const char *(*decl_printable_name) (tree decl, int verbosity);
365 /* Computes the dwarf-2/3 name for a tree. VERBOSITY determines what
366 information will be printed: 0: DECL_NAME, demangled as
367 necessary. 1: and scope information. */
368 const char *(*dwarf_name) (tree, int verbosity);
370 /* This compares two types for equivalence ("compatible" in C-based languages).
371 This routine should only return 1 if it is sure. It should not be used
372 in contexts where erroneously returning 0 causes problems. */
373 int (*types_compatible_p) (tree x, tree y);
375 /* Given a CALL_EXPR, return a function decl that is its target. */
376 tree (*lang_get_callee_fndecl) (tree);
378 /* Called by report_error_function to print out function name. */
379 void (*print_error_function) (struct diagnostic_context *, const char *);
381 /* Called from expr_size to calculate the size of the value of an
382 expression in a language-dependent way. Returns a tree for the size
383 in bytes. A frontend can call lhd_expr_size to get the default
384 semantics in cases that it doesn't want to handle specially. */
385 tree (*expr_size) (tree);
387 /* Convert a character from the host's to the target's character
388 set. The character should be in what C calls the "basic source
389 character set" (roughly, the set of characters defined by plain
390 old ASCII). The default is to return the character unchanged,
391 which is correct in most circumstances. Note that both argument
392 and result should be sign-extended under -fsigned-char,
393 zero-extended under -fno-signed-char. */
394 HOST_WIDE_INT (*to_target_charset) (HOST_WIDE_INT);
396 /* Pointers to machine-independent attribute tables, for front ends
397 using attribs.c. If one is NULL, it is ignored. Respectively, a
398 table of attributes specific to the language, a table of
399 attributes common to two or more languages (to allow easy
400 sharing), and a table of attributes for checking formats. */
401 const struct attribute_spec *attribute_table;
402 const struct attribute_spec *common_attribute_table;
403 const struct attribute_spec *format_attribute_table;
405 /* Function-related language hooks. */
406 struct lang_hooks_for_functions function;
408 struct lang_hooks_for_tree_inlining tree_inlining;
410 struct lang_hooks_for_callgraph callgraph;
412 struct lang_hooks_for_tree_dump tree_dump;
414 struct lang_hooks_for_decls decls;
416 struct lang_hooks_for_types types;
418 /* Perform language-specific gimplification on the argument. Returns an
419 enum gimplify_status, though we can't see that type here. */
420 int (*gimplify_expr) (tree *, tree *, tree *);
422 /* Fold an OBJ_TYPE_REF expression to the address of a function.
423 KNOWN_TYPE carries the true type of the OBJ_TYPE_REF_OBJECT. */
424 tree (*fold_obj_type_ref) (tree, tree);
426 /* Do language specific processing in the builtin function DECL */
427 tree (*builtin_function) (tree decl);
429 /* Used to set up the tree_contains_structure array for a frontend. */
430 void (*init_ts) (void);
432 /* Called by recompute_tree_invariant_for_addr_expr to go from EXPR
433 to a contained expression or DECL, possibly updating *TC, *TI or
434 *SE if in the process TREE_CONSTANT, TREE_INVARIANT or
435 TREE_SIDE_EFFECTS need updating. */
436 tree (*expr_to_decl) (tree expr, bool *tc, bool *ti, bool *se);
438 /* Whenever you add entries here, make sure you adjust langhooks-def.h
439 and langhooks.c accordingly. */
442 /* Each front end provides its own. */
443 extern const struct lang_hooks lang_hooks;
444 extern tree add_builtin_function (const char *name, tree type,
445 int function_code, enum built_in_class cl,
446 const char *library_name,
448 extern tree lhd_signed_or_unsigned_type (int unsignedp, tree type);
450 #endif /* GCC_LANG_HOOKS_H */