1 /* The lang_hooks data structure.
2 Copyright 2001, 2002 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC 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 GNU CC 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 GNU CC; 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) PARAMS ((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) PARAMS ((union tree_node **, int *,
41 int (*cannot_inline_tree_fn) PARAMS ((union tree_node **));
42 int (*disregard_inline_limits) PARAMS ((union tree_node *));
43 union tree_node *(*add_pending_fn_decls) PARAMS ((void *,
45 int (*tree_chain_matters_p) PARAMS ((union tree_node *));
46 int (*auto_var_in_fn_p) PARAMS ((union tree_node *, union tree_node *));
47 union tree_node *(*copy_res_decl_for_inlining) PARAMS ((union tree_node *,
52 int (*anon_aggr_type_p) PARAMS ((union tree_node *));
53 int (*start_inlining) PARAMS ((union tree_node *));
54 void (*end_inlining) PARAMS ((union tree_node *));
55 union tree_node *(*convert_parm_for_inlining) PARAMS ((union tree_node *,
60 /* The following hooks are used by tree-dump.c. */
62 struct lang_hooks_for_tree_dump
64 /* Dump language-specific parts of tree nodes. Returns non-zero if it
65 does not want the usual dumping of the second argument. */
66 int (*dump_tree) PARAMS ((void *, tree));
68 /* Determine type qualifiers in a language-specific way. */
69 int (*type_quals) PARAMS ((tree));
72 /* Hooks related to types. */
74 struct lang_hooks_for_types
76 /* Return a new type (with the indicated CODE), doing whatever
77 language-specific processing is required. */
78 tree (*make_type) PARAMS ((enum tree_code));
80 /* Given MODE and UNSIGNEDP, return a suitable type-tree with that
82 tree (*type_for_mode) PARAMS ((enum machine_mode, int));
84 /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an
85 integer type with at least that precision. */
86 tree (*type_for_size) PARAMS ((unsigned, int));
88 /* Given an integer type T, return a type like T but unsigned.
89 If T is unsigned, the value is T. */
90 tree (*unsigned_type) PARAMS ((tree));
92 /* Given an integer type T, return a type like T but signed.
93 If T is signed, the value is T. */
94 tree (*signed_type) PARAMS ((tree));
96 /* Return a type the same as TYPE except unsigned or signed
97 according to UNSIGNEDP. */
98 tree (*signed_or_unsigned_type) PARAMS ((int, tree));
100 /* Given a type, apply default promotions to unnamed function
101 arguments and return the new type. Return the same type if no
102 change. Required by any language that supports variadic
103 arguments. The default hook aborts. */
104 tree (*type_promotes_to) PARAMS ((tree));
106 /* This routine is called in tree.c to print an error message for
107 invalid use of an incomplete type. VALUE is the expression that
108 was used (or 0 if that isn't known) and TYPE is the type that was
110 void (*incomplete_type_error) PARAMS ((tree value, tree type));
113 /* Language hooks related to decls and the symbol table. */
115 struct lang_hooks_for_decls
117 /* Enter a new lexical scope. Argument is always zero when called
118 from outside the front end. */
119 void (*pushlevel) PARAMS ((int));
121 /* Exit a lexical scope and return a BINDING for that scope.
122 Takes three arguments:
123 KEEP -- nonzero if there were declarations in this scope.
124 REVERSE -- reverse the order of decls before returning them.
125 FUNCTIONBODY -- nonzero if this level is the body of a function. */
126 tree (*poplevel) PARAMS ((int, int, int));
128 /* Returns non-zero if we are in the global binding level. Ada
129 returns -1 for an undocumented reason used in stor-layout.c. */
130 int (*global_bindings_p) PARAMS ((void));
132 /* Insert BLOCK at the end of the list of subblocks of the
133 current binding level. This is used when a BIND_EXPR is expanded,
134 to handle the BLOCK node inside the BIND_EXPR. */
135 void (*insert_block) PARAMS ((tree));
137 /* Set the BLOCK node for the current scope level. */
138 void (*set_block) PARAMS ((tree));
140 /* Function to add a decl to the current scope level. Takes one
141 argument, a decl to add. Returns that decl, or, if the same
142 symbol is already declared, may return a different decl for that
144 tree (*pushdecl) PARAMS ((tree));
146 /* Returns the chain of decls so far in the current scope level. */
147 tree (*getdecls) PARAMS ((void));
149 /* Returns true when we should warn for an unused global DECL.
150 We will already have checked that it has static binding. */
151 bool (*warn_unused_global) PARAMS ((tree));
154 /* Language-specific hooks. See langhooks-def.h for defaults. */
158 /* String identifying the front end. e.g. "GNU C++". */
161 /* sizeof (struct lang_identifier), so make_node () creates
162 identifier nodes long enough for the language-specific slots. */
163 size_t identifier_size;
165 /* The first callback made to the front end, for simple
166 initialization needed before any calls to decode_option. */
167 void (*init_options) PARAMS ((void));
169 /* Function called with an option vector as argument, to decode a
170 single option (typically starting with -f or -W or +). It should
171 return the number of command-line arguments it uses if it handles
172 the option, or 0 and not complain if it does not recognise the
173 option. If this function returns a negative number, then its
174 absolute value is the number of command-line arguments used, but,
175 in addition, no language-independent option processing should be
176 done for this option. */
177 int (*decode_option) PARAMS ((int, char **));
179 /* Called when all command line options have been parsed. Should do
180 any required consistency checks, modifications etc. Complex
181 initialization should be left to the "init" callback, since GC
182 and the identifier hashes are set up between now and then. */
183 void (*post_options) PARAMS ((void));
185 /* Called after post_options, to initialize the front end. The main
186 input filename is passed, which may be NULL; the front end should
187 return the original filename (e.g. foo.i -> foo.c). Return NULL
188 to indicate a serious error of some sort; in that case no
189 compilation is performed, and the finish hook is called
191 const char * (*init) PARAMS ((const char *));
193 /* Called at the end of compilation, as a finalizer. */
194 void (*finish) PARAMS ((void));
196 /* Parses the entire file. */
197 void (*parse_file) PARAMS ((void));
199 /* Called immediately after parsing to clear the binding stack. */
200 void (*clear_binding_stack) PARAMS ((void));
202 /* Called to obtain the alias set to be used for an expression or type.
203 Returns -1 if the language does nothing special for it. */
204 HOST_WIDE_INT (*get_alias_set) PARAMS ((tree));
206 /* Called with an expression that is to be processed as a constant.
207 Returns either the same expression or a language-independent
208 constant equivalent to its input. */
209 tree (*expand_constant) PARAMS ((tree));
211 /* Called by expand_expr for language-specific tree codes.
212 Fourth argument is actually an enum expand_modifier. */
213 rtx (*expand_expr) PARAMS ((tree, rtx, enum machine_mode, int));
215 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical
218 This preparation consists of taking the ordinary representation
219 of an expression expr and producing a valid tree boolean
220 expression describing whether expr is nonzero. We could simply
221 always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1),
222 but we optimize comparisons, &&, ||, and !.
224 The result should be an expression of boolean type (if not an
226 tree (*truthvalue_conversion) PARAMS ((tree));
228 /* Possibly apply default attributes to a function (represented by
230 void (*insert_default_attributes) PARAMS ((tree));
232 /* Hook called by safe_from_p for language-specific tree codes. It is
233 up to the language front-end to install a hook if it has any such
234 codes that safe_from_p needs to know about. Since same_from_p will
235 recursively explore the TREE_OPERANDs of an expression, this hook
236 should not reexamine those pieces. This routine may recursively
237 call safe_from_p; it should always pass `0' as the TOP_P
239 int (*safe_from_p) PARAMS ((rtx, tree));
241 /* Function to finish handling an incomplete decl at the end of
242 compilation. Default hook is does nothing. */
243 void (*finish_incomplete_decl) PARAMS ((tree));
245 /* Function used by unsafe_for_reeval. A non-negative number is
246 returned directly from unsafe_for_reeval, a negative number falls
247 through. The default hook returns a negative number. */
248 int (*unsafe_for_reeval) PARAMS ((tree));
250 /* Mark EXP saying that we need to be able to take the address of
251 it; it should not be allocated in a register. Return true if
253 bool (*mark_addressable) PARAMS ((tree));
255 /* Hook called by staticp for language-specific tree codes. */
256 int (*staticp) PARAMS ((tree));
258 /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
259 DECL_NODE with a newly GC-allocated copy. */
260 void (*dup_lang_specific_decl) PARAMS ((tree));
262 /* Called before its argument, an UNSAVE_EXPR, is to be
263 unsaved. Modify it in-place so that all the evaluate only once
264 things are cleared out. */
265 tree (*unsave_expr_now) PARAMS ((tree));
267 /* Called by expand_expr to build and return the cleanup-expression
268 for the passed TARGET_EXPR. Return NULL if there is none. */
269 tree (*maybe_build_cleanup) PARAMS ((tree));
271 /* Mark nodes held through the lang_specific hooks in the tree. */
272 void (*mark_tree) PARAMS ((tree));
274 /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of
275 thing that the assembler should talk about, set
276 DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE.
277 Otherwise, set it to the ERROR_MARK_NODE to ensure that the
278 assembler does not talk about it. */
279 void (*set_decl_assembler_name) PARAMS ((tree));
281 /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */
284 /* The front end can add its own statistics to -fmem-report with
285 this hook. It should output to stderr. */
286 void (*print_statistics) PARAMS ((void));
288 /* Called by print_tree when there is a tree of class 'x' that it
289 doesn't know how to display. */
290 lang_print_tree_hook print_xnode;
292 /* Called to print language-dependent parts of a class 'd', class
293 't', and IDENTIFIER_NODE nodes. */
294 lang_print_tree_hook print_decl;
295 lang_print_tree_hook print_type;
296 lang_print_tree_hook print_identifier;
298 /* Computes the name to use to print a declaration. DECL is the
299 non-NULL declaration in question. VERBOSITY determines what
300 information will be printed: 0: DECL_NAME, demangled as
301 necessary. 1: and scope information. 2: and any other
302 information that might be interesting, such as function parameter
304 const char *(*decl_printable_name) PARAMS ((tree decl, int verbosity));
306 /* Called by report_error_function to print out function name. */
307 void (*print_error_function) PARAMS ((struct diagnostic_context *,
310 /* Set yydebug for bison-based parsers, when -dy is given on the
311 command line. By default, if the parameter is non-zero, prints a
312 warning that the front end does not use such a parser. */
313 void (*set_yydebug) PARAMS ((int));
315 struct lang_hooks_for_tree_inlining tree_inlining;
317 struct lang_hooks_for_tree_dump tree_dump;
319 struct lang_hooks_for_decls decls;
321 struct lang_hooks_for_types types;
323 /* Whenever you add entries here, make sure you adjust langhooks-def.h
324 and langhooks.c accordingly. */
327 /* Each front end provides its own. */
328 extern const struct lang_hooks lang_hooks;
330 #endif /* GCC_LANG_HOOKS_H */