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));
89 /* Language hooks related to decls and the symbol table. */
91 struct lang_hooks_for_decls
93 /* Enter a new lexical scope. Argument is always zero when called
94 from outside the front end. */
95 void (*pushlevel) PARAMS ((int));
97 /* Exit a lexical scope and return a BINDING for that scope.
98 Takes three arguments:
99 KEEP -- nonzero if there were declarations in this scope.
100 REVERSE -- reverse the order of decls before returning them.
101 FUNCTIONBODY -- nonzero if this level is the body of a function. */
102 tree (*poplevel) PARAMS ((int, int, int));
104 /* Returns non-zero if we are in the global binding level. Ada
105 returns -1 for an undocumented reason used in stor-layout.c. */
106 int (*global_bindings_p) PARAMS ((void));
108 /* Insert BLOCK at the end of the list of subblocks of the
109 current binding level. This is used when a BIND_EXPR is expanded,
110 to handle the BLOCK node inside the BIND_EXPR. */
111 void (*insert_block) PARAMS ((tree));
113 /* Set the BLOCK node for the current scope level. */
114 void (*set_block) PARAMS ((tree));
116 /* Function to add a decl to the current scope level. Takes one
117 argument, a decl to add. Returns that decl, or, if the same
118 symbol is already declared, may return a different decl for that
120 tree (*pushdecl) PARAMS ((tree));
122 /* Returns the chain of decls so far in the current scope level. */
123 tree (*getdecls) PARAMS ((void));
126 /* Language-specific hooks. See langhooks-def.h for defaults. */
130 /* String identifying the front end. e.g. "GNU C++". */
133 /* sizeof (struct lang_identifier), so make_node () creates
134 identifier nodes long enough for the language-specific slots. */
135 size_t identifier_size;
137 /* The first callback made to the front end, for simple
138 initialization needed before any calls to decode_option. */
139 void (*init_options) PARAMS ((void));
141 /* Function called with an option vector as argument, to decode a
142 single option (typically starting with -f or -W or +). It should
143 return the number of command-line arguments it uses if it handles
144 the option, or 0 and not complain if it does not recognise the
145 option. If this function returns a negative number, then its
146 absolute value is the number of command-line arguments used, but,
147 in addition, no language-independent option processing should be
148 done for this option. */
149 int (*decode_option) PARAMS ((int, char **));
151 /* Called when all command line options have been parsed. Should do
152 any required consistency checks, modifications etc. Complex
153 initialization should be left to the "init" callback, since GC
154 and the identifier hashes are set up between now and then. */
155 void (*post_options) PARAMS ((void));
157 /* Called after post_options, to initialize the front end. The main
158 input filename is passed, which may be NULL; the front end should
159 return the original filename (e.g. foo.i -> foo.c). Return NULL
160 to indicate a serious error of some sort; in that case no
161 compilation is performed, and the finish hook is called
163 const char * (*init) PARAMS ((const char *));
165 /* Called at the end of compilation, as a finalizer. */
166 void (*finish) PARAMS ((void));
168 /* Parses the entire file. */
169 void (*parse_file) PARAMS ((void));
171 /* Called immediately after parsing to clear the binding stack. */
172 void (*clear_binding_stack) PARAMS ((void));
174 /* Called to obtain the alias set to be used for an expression or type.
175 Returns -1 if the language does nothing special for it. */
176 HOST_WIDE_INT (*get_alias_set) PARAMS ((tree));
178 /* Called with an expression that is to be processed as a constant.
179 Returns either the same expression or a language-independent
180 constant equivalent to its input. */
181 tree (*expand_constant) PARAMS ((tree));
183 /* Called by expand_expr for language-specific tree codes.
184 Fourth argument is actually an enum expand_modifier. */
185 rtx (*expand_expr) PARAMS ((tree, rtx, enum machine_mode, int));
187 /* Possibly apply default attributes to a function (represented by
189 void (*insert_default_attributes) PARAMS ((tree));
191 /* Hook called by safe_from_p for language-specific tree codes. It is
192 up to the language front-end to install a hook if it has any such
193 codes that safe_from_p needs to know about. Since same_from_p will
194 recursively explore the TREE_OPERANDs of an expression, this hook
195 should not reexamine those pieces. This routine may recursively
196 call safe_from_p; it should always pass `0' as the TOP_P
198 int (*safe_from_p) PARAMS ((rtx, tree));
200 /* Hook called by staticp for language-specific tree codes. */
201 int (*staticp) PARAMS ((tree));
203 /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
204 DECL_NODE with a newly GC-allocated copy. */
205 void (*dup_lang_specific_decl) PARAMS ((tree));
207 /* Called before its argument, an UNSAVE_EXPR, is to be
208 unsaved. Modify it in-place so that all the evaluate only once
209 things are cleared out. */
210 tree (*unsave_expr_now) PARAMS ((tree));
212 /* Called by expand_expr to build and return the cleanup-expression
213 for the passed TARGET_EXPR. Return NULL if there is none. */
214 tree (*maybe_build_cleanup) PARAMS ((tree));
216 /* Mark nodes held through the lang_specific hooks in the tree. */
217 void (*mark_tree) PARAMS ((tree));
219 /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */
222 /* The front end can add its own statistics to -fmem-report with
223 this hook. It should output to stderr. */
224 void (*print_statistics) PARAMS ((void));
226 /* Called by print_tree when there is a tree of class 'x' that it
227 doesn't know how to display. */
228 lang_print_tree_hook print_xnode;
230 /* Called to print language-dependent parts of a class 'd', class
231 't', and IDENTIFIER_NODE nodes. */
232 lang_print_tree_hook print_decl;
233 lang_print_tree_hook print_type;
234 lang_print_tree_hook print_identifier;
236 /* Computes the name to use to print a declaration. DECL is the
237 non-NULL declaration in question. VERBOSITY determines what
238 information will be printed: 0: DECL_NAME, demangled as
239 necessary. 1: and scope information. 2: and any other
240 information that might be interesting, such as function parameter
242 const char *(*decl_printable_name) PARAMS ((tree decl, int verbosity));
244 /* Called by report_error_function to print out function name. */
245 void (*print_error_function) PARAMS ((struct diagnostic_context *,
248 /* Set yydebug for bison-based parsers, when -dy is given on the
249 command line. By default, if the parameter is non-zero, prints a
250 warning that the front end does not use such a parser. */
251 void (*set_yydebug) PARAMS ((int));
253 struct lang_hooks_for_tree_inlining tree_inlining;
255 struct lang_hooks_for_tree_dump tree_dump;
257 struct lang_hooks_for_decls decls;
259 struct lang_hooks_for_types types;
261 /* Whenever you add entries here, make sure you adjust langhooks-def.h
262 and langhooks.c accordingly. */
265 /* Each front end provides its own. */
266 extern const struct lang_hooks lang_hooks;
268 #endif /* GCC_LANG_HOOKS_H */