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 tree (*add_pending_fn_decls) (void *, tree);
44 int (*auto_var_in_fn_p) (tree, tree);
45 int (*anon_aggr_type_p) (tree);
46 bool (*var_mod_type_p) (tree, tree);
47 int (*start_inlining) (tree);
48 void (*end_inlining) (tree);
49 tree (*convert_parm_for_inlining) (tree, tree, tree, int);
52 struct lang_hooks_for_callgraph
54 /* The node passed is a language-specific tree node. If its contents
55 are relevant to use of other declarations, mark them. */
56 tree (*analyze_expr) (tree *, int *, tree);
58 /* Produce RTL for function passed as argument. */
59 void (*expand_function) (tree);
62 /* Lang hooks for management of language-specific data or status
63 when entering / leaving functions etc. */
64 struct lang_hooks_for_functions
66 /* Called when entering a function. */
67 void (*init) (struct function *);
69 /* Called when leaving a function. */
70 void (*final) (struct function *);
72 /* Called when entering a nested function. */
73 void (*enter_nested) (struct function *);
75 /* Called when leaving a nested function. */
76 void (*leave_nested) (struct function *);
78 /* Determines if it's ok for a function to have no noreturn attribute. */
79 bool (*missing_noreturn_ok_p) (tree);
82 /* The following hooks are used by tree-dump.c. */
84 struct lang_hooks_for_tree_dump
86 /* Dump language-specific parts of tree nodes. Returns nonzero if it
87 does not want the usual dumping of the second argument. */
88 bool (*dump_tree) (void *, tree);
90 /* Determine type qualifiers in a language-specific way. */
91 int (*type_quals) (tree);
94 /* Hooks related to types. */
96 struct lang_hooks_for_types
98 /* Return a new type (with the indicated CODE), doing whatever
99 language-specific processing is required. */
100 tree (*make_type) (enum tree_code);
102 /* Given MODE and UNSIGNEDP, return a suitable type-tree with that
104 tree (*type_for_mode) (enum machine_mode, int);
106 /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an
107 integer type with at least that precision. */
108 tree (*type_for_size) (unsigned, int);
110 /* Given an integer type T, return a type like T but unsigned.
111 If T is unsigned, the value is T. */
112 tree (*unsigned_type) (tree);
114 /* Given an integer type T, return a type like T but signed.
115 If T is signed, the value is T. */
116 tree (*signed_type) (tree);
118 /* Return a type the same as TYPE except unsigned or signed
119 according to UNSIGNEDP. */
120 tree (*signed_or_unsigned_type) (int, tree);
122 /* Given a type, apply default promotions to unnamed function
123 arguments and return the new type. Return the same type if no
124 change. Required by any language that supports variadic
125 arguments. The default hook dies. */
126 tree (*type_promotes_to) (tree);
128 /* Register TYPE as a builtin type with the indicated NAME. The
129 TYPE is placed in the outermost lexical scope. The semantics
130 should be analogous to:
134 in C. The default hook ignores the declaration. */
135 void (*register_builtin_type) (tree, const char *);
137 /* This routine is called in tree.c to print an error message for
138 invalid use of an incomplete type. VALUE is the expression that
139 was used (or 0 if that isn't known) and TYPE is the type that was
141 void (*incomplete_type_error) (tree value, tree type);
143 /* Called from assign_temp to return the maximum size, if there is one,
145 tree (*max_size) (tree);
147 /* Register language specific type size variables as potentially OpenMP
148 firstprivate variables. */
149 void (*omp_firstprivatize_type_sizes) (struct gimplify_omp_ctx *, tree);
151 /* Nonzero if types that are identical are to be hashed so that only
152 one copy is kept. If a language requires unique types for each
153 user-specified type, such as Ada, this should be set to TRUE. */
157 /* Language hooks related to decls and the symbol table. */
159 struct lang_hooks_for_decls
161 /* Returns nonzero if we are in the global binding level. Ada
162 returns -1 for an undocumented reason used in stor-layout.c. */
163 int (*global_bindings_p) (void);
165 /* Insert BLOCK at the end of the list of subblocks of the
166 current binding level. This is used when a BIND_EXPR is expanded,
167 to handle the BLOCK node inside the BIND_EXPR. */
168 void (*insert_block) (tree);
170 /* Function to add a decl to the current scope level. Takes one
171 argument, a decl to add. Returns that decl, or, if the same
172 symbol is already declared, may return a different decl for that
174 tree (*pushdecl) (tree);
176 /* Returns the chain of decls so far in the current scope level. */
177 tree (*getdecls) (void);
179 /* Returns true when we should warn for an unused global DECL.
180 We will already have checked that it has static binding. */
181 bool (*warn_unused_global) (tree);
183 /* Obtain a list of globals and do final output on them at end
185 void (*final_write_globals) (void);
187 /* Do necessary preparations before assemble_variable can proceed. */
188 void (*prepare_assemble_variable) (tree);
190 /* True if this decl may be called via a sibcall. */
191 bool (*ok_for_sibcall) (tree);
193 /* Return the COMDAT group into which this DECL should be placed.
194 It is known that the DECL belongs in *some* COMDAT group when
195 this hook is called. The return value will be used immediately,
196 but not explicitly deallocated, so implementations should not use
197 xmalloc to allocate the string returned. (Typically, the return
198 value will be the string already stored in an
200 const char * (*comdat_group) (tree);
202 /* True if OpenMP should privatize what this DECL points to rather
203 than the DECL itself. */
204 bool (*omp_privatize_by_reference) (tree);
206 /* Return sharing kind if OpenMP sharing attribute of DECL is
207 predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */
208 enum omp_clause_default_kind (*omp_predetermined_sharing) (tree);
210 /* Return true if DECL's DECL_VALUE_EXPR (if any) should be
211 disregarded in OpenMP construct, because it is going to be
212 remapped during OpenMP lowering. SHARED is true if DECL
213 is going to be shared, false if it is going to be privatized. */
214 bool (*omp_disregard_value_expr) (tree, bool);
216 /* Return true if DECL that is shared iff SHARED is true should
217 be put into OMP_CLAUSE_PRIVATE_DEBUG. */
218 bool (*omp_private_debug_clause) (tree, bool);
220 /* Build and return code for a default constructor for DECL in
221 response to CLAUSE. Return NULL if nothing to be done. */
222 tree (*omp_clause_default_ctor) (tree clause, tree decl);
224 /* Build and return code for a copy constructor from SRC to DST. */
225 tree (*omp_clause_copy_ctor) (tree clause, tree dst, tree src);
227 /* Similarly, except use an assignment operator instead. */
228 tree (*omp_clause_assign_op) (tree clause, tree dst, tree src);
230 /* Build and return code destructing DECL. Return NULL if nothing
232 tree (*omp_clause_dtor) (tree clause, tree decl);
235 /* Language-specific hooks. See langhooks-def.h for defaults. */
239 /* String identifying the front end. e.g. "GNU C++". */
242 /* sizeof (struct lang_identifier), so make_node () creates
243 identifier nodes long enough for the language-specific slots. */
244 size_t identifier_size;
246 /* Determines the size of any language-specific tcc_constant or
247 tcc_exceptional nodes. Since it is called from make_node, the
248 only information available is the tree code. Expected to die
249 on unrecognized codes. */
250 size_t (*tree_size) (enum tree_code);
252 /* The first callback made to the front end, for simple
253 initialization needed before any calls to handle_option. Return
254 the language mask to filter the switch array with. */
255 unsigned int (*init_options) (unsigned int argc, const char **argv);
257 /* Callback used to perform language-specific initialization for the
258 global diagnostic context structure. */
259 void (*initialize_diagnostics) (struct diagnostic_context *);
261 /* Handle the switch CODE, which has real type enum opt_code from
262 options.h. If the switch takes an argument, it is passed in ARG
263 which points to permanent storage. The handler is responsible for
264 checking whether ARG is NULL, which indicates that no argument
265 was in fact supplied. For -f and -W switches, VALUE is 1 or 0
266 for the positive and negative forms respectively.
268 Return 1 if the switch is valid, 0 if invalid, and -1 if it's
269 valid and should not be treated as language-independent too. */
270 int (*handle_option) (size_t code, const char *arg, int value);
272 /* Return false to use the default complaint about a missing
273 argument, otherwise output a complaint and return true. */
274 bool (*missing_argument) (const char *opt, size_t code);
276 /* Called when all command line options have been parsed to allow
277 further processing and initialization
279 Should return true to indicate that a compiler back-end is
280 not required, such as with the -E option.
282 If errorcount is nonzero after this call the compiler exits
283 immediately and the finish hook is not called. */
284 bool (*post_options) (const char **);
286 /* Called after post_options to initialize the front end. Return
287 false to indicate that no further compilation be performed, in
288 which case the finish hook is called immediately. */
291 /* Called at the end of compilation, as a finalizer. */
292 void (*finish) (void);
294 /* Parses the entire file. The argument is nonzero to cause bison
295 parsers to dump debugging information during parsing. */
296 void (*parse_file) (int);
298 /* Called immediately after parsing to clear the binding stack. */
299 void (*clear_binding_stack) (void);
301 /* Called to obtain the alias set to be used for an expression or type.
302 Returns -1 if the language does nothing special for it. */
303 HOST_WIDE_INT (*get_alias_set) (tree);
305 /* Called with an expression that is to be processed as a constant.
306 Returns either the same expression or a language-independent
307 constant equivalent to its input. */
308 tree (*expand_constant) (tree);
310 /* Called by expand_expr for language-specific tree codes.
311 Fourth argument is actually an enum expand_modifier. */
312 rtx (*expand_expr) (tree, rtx, enum machine_mode, int, rtx *);
314 /* Called by expand_expr to generate the definition of a decl. Returns
315 1 if handled, 0 otherwise. */
316 int (*expand_decl) (tree);
318 /* Function to finish handling an incomplete decl at the end of
319 compilation. Default hook is does nothing. */
320 void (*finish_incomplete_decl) (tree);
322 /* Mark EXP saying that we need to be able to take the address of
323 it; it should not be allocated in a register. Return true if
325 bool (*mark_addressable) (tree);
327 /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
328 DECL_NODE with a newly GC-allocated copy. */
329 void (*dup_lang_specific_decl) (tree);
331 /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of
332 thing that the assembler should talk about, set
333 DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE.
334 Otherwise, set it to the ERROR_MARK_NODE to ensure that the
335 assembler does not talk about it. */
336 void (*set_decl_assembler_name) (tree);
338 /* Nonzero if operations on types narrower than their mode should
339 have their results reduced to the precision of the type. */
340 bool reduce_bit_field_operations;
342 /* Nonzero if this front end does not generate a dummy BLOCK between
343 the outermost scope of the function and the FUNCTION_DECL. See
344 is_body_block in stmt.c, and its callers. */
347 /* The front end can add its own statistics to -fmem-report with
348 this hook. It should output to stderr. */
349 void (*print_statistics) (void);
351 /* Called by print_tree when there is a tree of class tcc_exceptional
352 that it doesn't know how to display. */
353 lang_print_tree_hook print_xnode;
355 /* Called to print language-dependent parts of tcc_decl, tcc_type,
356 and IDENTIFIER_NODE nodes. */
357 lang_print_tree_hook print_decl;
358 lang_print_tree_hook print_type;
359 lang_print_tree_hook print_identifier;
361 /* Computes the name to use to print a declaration. DECL is the
362 non-NULL declaration in question. VERBOSITY determines what
363 information will be printed: 0: DECL_NAME, demangled as
364 necessary. 1: and scope information. 2: and any other
365 information that might be interesting, such as function parameter
367 const char *(*decl_printable_name) (tree decl, int verbosity);
369 /* Computes the dwarf-2/3 name for a tree. VERBOSITY determines what
370 information will be printed: 0: DECL_NAME, demangled as
371 necessary. 1: and scope information. */
372 const char *(*dwarf_name) (tree, int verbosity);
374 /* This compares two types for equivalence ("compatible" in C-based languages).
375 This routine should only return 1 if it is sure. It should not be used
376 in contexts where erroneously returning 0 causes problems. */
377 int (*types_compatible_p) (tree x, tree y);
379 /* Given a CALL_EXPR, return a function decl that is its target. */
380 tree (*lang_get_callee_fndecl) (tree);
382 /* Called by report_error_function to print out function name. */
383 void (*print_error_function) (struct diagnostic_context *, const char *);
385 /* Called from expr_size to calculate the size of the value of an
386 expression in a language-dependent way. Returns a tree for the size
387 in bytes. A frontend can call lhd_expr_size to get the default
388 semantics in cases that it doesn't want to handle specially. */
389 tree (*expr_size) (tree);
391 /* Convert a character from the host's to the target's character
392 set. The character should be in what C calls the "basic source
393 character set" (roughly, the set of characters defined by plain
394 old ASCII). The default is to return the character unchanged,
395 which is correct in most circumstances. Note that both argument
396 and result should be sign-extended under -fsigned-char,
397 zero-extended under -fno-signed-char. */
398 HOST_WIDE_INT (*to_target_charset) (HOST_WIDE_INT);
400 /* Pointers to machine-independent attribute tables, for front ends
401 using attribs.c. If one is NULL, it is ignored. Respectively, a
402 table of attributes specific to the language, a table of
403 attributes common to two or more languages (to allow easy
404 sharing), and a table of attributes for checking formats. */
405 const struct attribute_spec *attribute_table;
406 const struct attribute_spec *common_attribute_table;
407 const struct attribute_spec *format_attribute_table;
409 /* Function-related language hooks. */
410 struct lang_hooks_for_functions function;
412 struct lang_hooks_for_tree_inlining tree_inlining;
414 struct lang_hooks_for_callgraph callgraph;
416 struct lang_hooks_for_tree_dump tree_dump;
418 struct lang_hooks_for_decls decls;
420 struct lang_hooks_for_types types;
422 /* Perform language-specific gimplification on the argument. Returns an
423 enum gimplify_status, though we can't see that type here. */
424 int (*gimplify_expr) (tree *, tree *, tree *);
426 /* Fold an OBJ_TYPE_REF expression to the address of a function.
427 KNOWN_TYPE carries the true type of the OBJ_TYPE_REF_OBJECT. */
428 tree (*fold_obj_type_ref) (tree, tree);
430 /* Do language specific processing in the builtin function DECL */
431 tree (*builtin_function) (tree decl);
433 /* Used to set up the tree_contains_structure array for a frontend. */
434 void (*init_ts) (void);
436 /* Called by recompute_tree_invariant_for_addr_expr to go from EXPR
437 to a contained expression or DECL, possibly updating *TC, *TI or
438 *SE if in the process TREE_CONSTANT, TREE_INVARIANT or
439 TREE_SIDE_EFFECTS need updating. */
440 tree (*expr_to_decl) (tree expr, bool *tc, bool *ti, bool *se);
442 /* Whenever you add entries here, make sure you adjust langhooks-def.h
443 and langhooks.c accordingly. */
446 /* Each front end provides its own. */
447 extern const struct lang_hooks lang_hooks;
448 extern tree add_builtin_function (const char *name, tree type,
449 int function_code, enum built_in_class cl,
450 const char *library_name,
452 extern tree lhd_signed_or_unsigned_type (int unsignedp, tree type);
454 #endif /* GCC_LANG_HOOKS_H */