1 /* The lang_hooks data structure.
2 Copyright 2001, 2002, 2003 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, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, 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 /* A print hook for print_tree (). */
29 typedef void (*lang_print_tree_hook) (FILE *, tree, int indent);
31 /* The following hooks are documented in langhooks.c. Must not be
34 struct lang_hooks_for_tree_inlining
36 union tree_node *(*walk_subtrees) (union tree_node **, int *,
38 (union tree_node **, int *, void *),
40 int (*cannot_inline_tree_fn) (union tree_node **);
41 int (*disregard_inline_limits) (union tree_node *);
42 union tree_node *(*add_pending_fn_decls) (void *, union tree_node *);
43 int (*tree_chain_matters_p) (union tree_node *);
44 int (*auto_var_in_fn_p) (union tree_node *, union tree_node *);
45 union tree_node *(*copy_res_decl_for_inlining) (union tree_node *,
49 int (*anon_aggr_type_p) (union tree_node *);
50 bool (*var_mod_type_p) (union tree_node *);
51 int (*start_inlining) (union tree_node *);
52 void (*end_inlining) (union tree_node *);
53 union tree_node *(*convert_parm_for_inlining) (union tree_node *,
58 struct lang_hooks_for_callgraph
60 /* Function passed as argument is needed and will be compiled.
61 Lower the representation so the calls are explicit. */
62 void (*lower_function) (union tree_node *);
63 /* Produce RTL for function passed as argument. */
64 void (*expand_function) (union tree_node *);
67 /* Lang hooks for management of language-specific data or status
68 when entering / leaving functions etc. */
69 struct lang_hooks_for_functions
71 /* Called when entering a function. */
72 void (*init) (struct function *);
74 /* Called when leaving a function. */
75 void (*final) (struct function *);
77 /* Called when entering a nested function. */
78 void (*enter_nested) (struct function *);
80 /* Called when leaving a nested function. */
81 void (*leave_nested) (struct function *);
84 /* The following hooks are used by tree-dump.c. */
86 struct lang_hooks_for_tree_dump
88 /* Dump language-specific parts of tree nodes. Returns nonzero if it
89 does not want the usual dumping of the second argument. */
90 bool (*dump_tree) (void *, tree);
92 /* Determine type qualifiers in a language-specific way. */
93 int (*type_quals) (tree);
96 /* Hooks related to types. */
98 struct lang_hooks_for_types
100 /* Return a new type (with the indicated CODE), doing whatever
101 language-specific processing is required. */
102 tree (*make_type) (enum tree_code);
104 /* Given MODE and UNSIGNEDP, return a suitable type-tree with that
106 tree (*type_for_mode) (enum machine_mode, int);
108 /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an
109 integer type with at least that precision. */
110 tree (*type_for_size) (unsigned, int);
112 /* Given an integer type T, return a type like T but unsigned.
113 If T is unsigned, the value is T. */
114 tree (*unsigned_type) (tree);
116 /* Given an integer type T, return a type like T but signed.
117 If T is signed, the value is T. */
118 tree (*signed_type) (tree);
120 /* Return a type the same as TYPE except unsigned or signed
121 according to UNSIGNEDP. */
122 tree (*signed_or_unsigned_type) (int, tree);
124 /* Given a type, apply default promotions to unnamed function
125 arguments and return the new type. Return the same type if no
126 change. Required by any language that supports variadic
127 arguments. The default hook aborts. */
128 tree (*type_promotes_to) (tree);
130 /* This routine is called in tree.c to print an error message for
131 invalid use of an incomplete type. VALUE is the expression that
132 was used (or 0 if that isn't known) and TYPE is the type that was
134 void (*incomplete_type_error) (tree value, tree type);
137 /* Language hooks related to decls and the symbol table. */
139 struct lang_hooks_for_decls
141 /* Enter a new lexical scope. Argument is always zero when called
142 from outside the front end. */
143 void (*pushlevel) (int);
145 /* Exit a lexical scope and return a BINDING for that scope.
146 Takes three arguments:
147 KEEP -- nonzero if there were declarations in this scope.
148 REVERSE -- reverse the order of decls before returning them.
149 FUNCTIONBODY -- nonzero if this level is the body of a function. */
150 tree (*poplevel) (int, int, int);
152 /* Returns nonzero if we are in the global binding level. Ada
153 returns -1 for an undocumented reason used in stor-layout.c. */
154 int (*global_bindings_p) (void);
156 /* Insert BLOCK at the end of the list of subblocks of the
157 current binding level. This is used when a BIND_EXPR is expanded,
158 to handle the BLOCK node inside the BIND_EXPR. */
159 void (*insert_block) (tree);
161 /* Set the BLOCK node for the current scope level. */
162 void (*set_block) (tree);
164 /* Function to add a decl to the current scope level. Takes one
165 argument, a decl to add. Returns that decl, or, if the same
166 symbol is already declared, may return a different decl for that
168 tree (*pushdecl) (tree);
170 /* Returns the chain of decls so far in the current scope level. */
171 tree (*getdecls) (void);
173 /* Returns true when we should warn for an unused global DECL.
174 We will already have checked that it has static binding. */
175 bool (*warn_unused_global) (tree);
177 /* Obtain a list of globals and do final output on them at end
179 void (*final_write_globals) (void);
181 /* Do necessary preparations before assemble_variable can proceed. */
182 void (*prepare_assemble_variable) (tree);
184 /* True if this decl may be called via a sibcall. */
185 bool (*ok_for_sibcall) (tree);
188 /* Language-specific hooks. See langhooks-def.h for defaults. */
192 /* String identifying the front end. e.g. "GNU C++". */
195 /* sizeof (struct lang_identifier), so make_node () creates
196 identifier nodes long enough for the language-specific slots. */
197 size_t identifier_size;
199 /* Determines the size of any language-specific 'x' or 'c' nodes.
200 Since it is called from make_node, the only information available
201 is the tree code. Expected to abort on unrecognized codes. */
202 size_t (*tree_size) (enum tree_code);
204 /* The first callback made to the front end, for simple
205 initialization needed before any calls to handle_option. Return
206 the language mask to filter the switch array with. */
207 unsigned int (*init_options) (unsigned int argc, const char **argv);
209 /* Handle the switch CODE, which has real type enum opt_code from
210 options.h. If the switch takes an argument, it is passed in ARG
211 which points to permanent storage. The handler is responsible for
212 checking whether ARG is NULL, which indicates that no argument
213 was in fact supplied. For -f and -W switches, VALUE is 1 or 0
214 for the positive and negative forms respectively.
216 Return 1 if the switch is valid, 0 if invalid, and -1 if it's
217 valid and should not be treated as language-independent too. */
218 int (*handle_option) (size_t code, const char *arg, int value);
220 /* Handle a filename on the command line. */
221 void (*handle_filename) (const char *filename);
223 /* Return false to use the default complaint about a missing
224 argument, otherwise output a complaint and return true. */
225 bool (*missing_argument) (const char *opt, size_t code);
227 /* Called when all command line options have been parsed to allow
228 further processing and initialization
230 Should return true to indicate that a compiler back-end is
231 not required, such as with the -E option.
233 If errorcount is nonzero after this call the compiler exits
234 immediately and the finish hook is not called. */
235 bool (*post_options) (const char **);
237 /* Called after post_options to initialize the front end. Return
238 false to indicate that no further compilation be performed, in
239 which case the finish hook is called immediately. */
242 /* Called at the end of compilation, as a finalizer. */
243 void (*finish) (void);
245 /* Parses the entire file. The argument is nonzero to cause bison
246 parsers to dump debugging information during parsing. */
247 void (*parse_file) (int);
249 /* Called immediately after parsing to clear the binding stack. */
250 void (*clear_binding_stack) (void);
252 /* Called to obtain the alias set to be used for an expression or type.
253 Returns -1 if the language does nothing special for it. */
254 HOST_WIDE_INT (*get_alias_set) (tree);
256 /* Called with an expression that is to be processed as a constant.
257 Returns either the same expression or a language-independent
258 constant equivalent to its input. */
259 tree (*expand_constant) (tree);
261 /* Called by expand_expr for language-specific tree codes.
262 Fourth argument is actually an enum expand_modifier. */
263 rtx (*expand_expr) (tree, rtx, enum machine_mode, int);
265 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical
268 This preparation consists of taking the ordinary representation
269 of an expression expr and producing a valid tree boolean
270 expression describing whether expr is nonzero. We could simply
271 always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1),
272 but we optimize comparisons, &&, ||, and !.
274 The result should be an expression of boolean type (if not an
276 tree (*truthvalue_conversion) (tree);
278 /* Possibly apply default attributes to a function (represented by
280 void (*insert_default_attributes) (tree);
282 /* Hook called by safe_from_p for language-specific tree codes. It is
283 up to the language front-end to install a hook if it has any such
284 codes that safe_from_p needs to know about. Since same_from_p will
285 recursively explore the TREE_OPERANDs of an expression, this hook
286 should not reexamine those pieces. This routine may recursively
287 call safe_from_p; it should always pass `0' as the TOP_P
289 int (*safe_from_p) (rtx, tree);
291 /* Function to finish handling an incomplete decl at the end of
292 compilation. Default hook is does nothing. */
293 void (*finish_incomplete_decl) (tree);
295 /* Function used by unsafe_for_reeval. A non-negative number is
296 returned directly from unsafe_for_reeval, a negative number falls
297 through. The default hook returns a negative number. */
298 int (*unsafe_for_reeval) (tree);
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
303 bool (*mark_addressable) (tree);
305 /* Hook called by staticp for language-specific tree codes. */
306 int (*staticp) (tree);
308 /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
309 DECL_NODE with a newly GC-allocated copy. */
310 void (*dup_lang_specific_decl) (tree);
312 /* Called before its argument, an UNSAVE_EXPR, is to be
313 unsaved. Modify it in-place so that all the evaluate only once
314 things are cleared out. */
315 tree (*unsave_expr_now) (tree);
317 /* Called by expand_expr to build and return the cleanup-expression
318 for the passed TARGET_EXPR. Return NULL if there is none. */
319 tree (*maybe_build_cleanup) (tree);
321 /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of
322 thing that the assembler should talk about, set
323 DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE.
324 Otherwise, set it to the ERROR_MARK_NODE to ensure that the
325 assembler does not talk about it. */
326 void (*set_decl_assembler_name) (tree);
328 /* Return nonzero if fold-const is free to use bit-field
329 optimizations, for instance in fold_truthop(). */
330 bool (*can_use_bit_fields_p) (void);
332 /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */
335 /* Nonzero if this front end does not generate a dummy BLOCK between
336 the outermost scope of the function and the FUNCTION_DECL. See
337 is_body_block in stmt.c, and its callers. */
340 /* The front end can add its own statistics to -fmem-report with
341 this hook. It should output to stderr. */
342 void (*print_statistics) (void);
344 /* Called by print_tree when there is a tree of class 'x' that it
345 doesn't know how to display. */
346 lang_print_tree_hook print_xnode;
348 /* Called to print language-dependent parts of a class 'd', class
349 't', and IDENTIFIER_NODE nodes. */
350 lang_print_tree_hook print_decl;
351 lang_print_tree_hook print_type;
352 lang_print_tree_hook print_identifier;
354 /* Computes the name to use to print a declaration. DECL is the
355 non-NULL declaration in question. VERBOSITY determines what
356 information will be printed: 0: DECL_NAME, demangled as
357 necessary. 1: and scope information. 2: and any other
358 information that might be interesting, such as function parameter
360 const char *(*decl_printable_name) (tree decl, int verbosity);
362 /* Called by report_error_function to print out function name. */
363 void (*print_error_function) (struct diagnostic_context *, const char *);
365 /* Called from expr_size to calculate the size of the value of an
366 expression in a language-dependent way. Returns a tree for the size
367 in bytes. A frontend can call lhd_expr_size to get the default
368 semantics in cases that it doesn't want to handle specially. */
369 tree (*expr_size) (tree);
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;
380 /* Function-related language hooks. */
381 struct lang_hooks_for_functions function;
383 struct lang_hooks_for_tree_inlining tree_inlining;
385 struct lang_hooks_for_callgraph callgraph;
387 struct lang_hooks_for_tree_dump tree_dump;
389 struct lang_hooks_for_decls decls;
391 struct lang_hooks_for_types types;
393 /* Whenever you add entries here, make sure you adjust langhooks-def.h
394 and langhooks.c accordingly. */
397 /* Each front end provides its own. */
398 extern const struct lang_hooks lang_hooks;
400 #endif /* GCC_LANG_HOOKS_H */