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 /* A print hook for print_tree (). */
27 typedef void (*lang_print_tree_hook) PARAMS ((FILE *, tree, int indent));
29 /* The following hooks are documented in langhooks.c. Must not be
32 struct lang_hooks_for_tree_inlining
34 union tree_node *(*walk_subtrees) PARAMS ((union tree_node **, int *,
39 int (*cannot_inline_tree_fn) PARAMS ((union tree_node **));
40 int (*disregard_inline_limits) PARAMS ((union tree_node *));
41 union tree_node *(*add_pending_fn_decls) PARAMS ((void *,
43 int (*tree_chain_matters_p) PARAMS ((union tree_node *));
44 int (*auto_var_in_fn_p) PARAMS ((union tree_node *, union tree_node *));
45 union tree_node *(*copy_res_decl_for_inlining) PARAMS ((union tree_node *,
50 int (*anon_aggr_type_p) PARAMS ((union tree_node *));
51 int (*start_inlining) PARAMS ((union tree_node *));
52 void (*end_inlining) PARAMS ((union tree_node *));
53 union tree_node *(*convert_parm_for_inlining) PARAMS ((union tree_node *,
58 /* The following hooks are used by tree-dump.c. */
60 struct lang_hooks_for_tree_dump
62 /* Dump language-specific parts of tree nodes. Returns non-zero if it
63 does not want the usual dumping of the second argument. */
64 int (*dump_tree) PARAMS ((void *, tree));
66 /* Determine type qualifiers in a language-specific way. */
67 int (*type_quals) PARAMS ((tree));
70 /* Language hooks related to decls and the symbol table. */
72 struct lang_hooks_for_decls
74 /* Enter a new lexical scope. Argument is always zero when called
75 from outside the front end. */
76 void (*pushlevel) PARAMS ((int));
78 /* Exit a lexical scope and return a BINDING for that scope.
79 Takes three arguments:
80 KEEP -- nonzero if there were declarations in this scope.
81 REVERSE -- reverse the order of decls before returning them.
82 FUNCTIONBODY -- nonzero if this level is the body of a function. */
83 tree (*poplevel) PARAMS ((int, int, int));
85 /* Returns non-zero if we are in the global binding level. Ada
86 returns -1 for an undocumented reason used in stor-layout.c. */
87 int (*global_bindings_p) PARAMS ((void));
89 /* Insert BLOCK at the end of the list of subblocks of the
90 current binding level. This is used when a BIND_EXPR is expanded,
91 to handle the BLOCK node inside the BIND_EXPR. */
92 void (*insert_block) PARAMS ((tree));
94 /* Set the BLOCK node for the current scope level. */
95 void (*set_block) PARAMS ((tree));
97 /* Function to add a decl to the current scope level. Takes one
98 argument, a decl to add. Returns that decl, or, if the same
99 symbol is already declared, may return a different decl for that
101 tree (*pushdecl) PARAMS ((tree));
103 /* Returns the chain of decls so far in the current scope level. */
104 tree (*getdecls) PARAMS ((void));
107 /* Language-specific hooks. See langhooks-def.h for defaults. */
111 /* String identifying the front end. e.g. "GNU C++". */
114 /* sizeof (struct lang_identifier), so make_node () creates
115 identifier nodes long enough for the language-specific slots. */
116 size_t identifier_size;
118 /* The first callback made to the front end, for simple
119 initialization needed before any calls to decode_option. */
120 void (*init_options) PARAMS ((void));
122 /* Function called with an option vector as argument, to decode a
123 single option (typically starting with -f or -W or +). It should
124 return the number of command-line arguments it uses if it handles
125 the option, or 0 and not complain if it does not recognise the
126 option. If this function returns a negative number, then its
127 absolute value is the number of command-line arguments used, but,
128 in addition, no language-independent option processing should be
129 done for this option. */
130 int (*decode_option) PARAMS ((int, char **));
132 /* Called when all command line options have been parsed. Should do
133 any required consistency checks, modifications etc. Complex
134 initialization should be left to the "init" callback, since GC
135 and the identifier hashes are set up between now and then. */
136 void (*post_options) PARAMS ((void));
138 /* Called after post_options, to initialize the front end. The main
139 input filename is passed, which may be NULL; the front end should
140 return the original filename (e.g. foo.i -> foo.c). Return NULL
141 to indicate a serious error of some sort; in that case no
142 compilation is performed, and the finish hook is called
144 const char * (*init) PARAMS ((const char *));
146 /* Called at the end of compilation, as a finalizer. */
147 void (*finish) PARAMS ((void));
149 /* Parses the entire file. */
150 void (*parse_file) PARAMS ((void));
152 /* Called immediately after parsing to clear the binding stack. */
153 void (*clear_binding_stack) PARAMS ((void));
155 /* Called to obtain the alias set to be used for an expression or type.
156 Returns -1 if the language does nothing special for it. */
157 HOST_WIDE_INT (*get_alias_set) PARAMS ((tree));
159 /* Called with an expression that is to be processed as a constant.
160 Returns either the same expression or a language-independent
161 constant equivalent to its input. */
162 tree (*expand_constant) PARAMS ((tree));
164 /* Called by expand_expr for language-specific tree codes.
165 Fourth argument is actually an enum expand_modifier. */
166 rtx (*expand_expr) PARAMS ((tree, rtx, enum machine_mode, int));
168 /* Possibly apply default attributes to a function (represented by
170 void (*insert_default_attributes) PARAMS ((tree));
172 /* Hook called by safe_from_p for language-specific tree codes. It is
173 up to the language front-end to install a hook if it has any such
174 codes that safe_from_p needs to know about. Since same_from_p will
175 recursively explore the TREE_OPERANDs of an expression, this hook
176 should not reexamine those pieces. This routine may recursively
177 call safe_from_p; it should always pass `0' as the TOP_P
179 int (*safe_from_p) PARAMS ((rtx, tree));
181 /* Hook called by staticp for language-specific tree codes. */
182 int (*staticp) PARAMS ((tree));
184 /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
185 DECL_NODE with a newly GC-allocated copy. */
186 void (*dup_lang_specific_decl) PARAMS ((tree));
188 /* Called before its argument, an UNSAVE_EXPR, is to be
189 unsaved. Modify it in-place so that all the evaluate only once
190 things are cleared out. */
191 tree (*unsave_expr_now) PARAMS ((tree));
193 /* Called by expand_expr to build and return the cleanup-expression
194 for the passed TARGET_EXPR. Return NULL if there is none. */
195 tree (*maybe_build_cleanup) PARAMS ((tree));
197 /* Mark nodes held through the lang_specific hooks in the tree. */
198 void (*mark_tree) PARAMS ((tree));
200 /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */
203 /* The front end can add its own statistics to -fmem-report with
204 this hook. It should output to stderr. */
205 void (*print_statistics) PARAMS ((void));
207 /* Called by print_tree when there is a tree of class 'x' that it
208 doesn't know how to display. */
209 lang_print_tree_hook print_xnode;
211 /* Called to print language-dependent parts of a class 'd', class
212 't', and IDENTIFIER_NODE nodes. */
213 lang_print_tree_hook print_decl;
214 lang_print_tree_hook print_type;
215 lang_print_tree_hook print_identifier;
217 /* Computes the name to use to print a declaration. DECL is the
218 non-NULL declaration in question. VERBOSITY determines what
219 information will be printed: 0: DECL_NAME, demangled as
220 necessary. 1: and scope information. 2: and any other
221 information that might be interesting, such as function parameter
223 const char *(*decl_printable_name) PARAMS ((tree decl, int verbosity));
225 /* Set yydebug for bison-based parsers, when -dy is given on the
226 command line. By default, if the parameter is non-zero, prints a
227 warning that the front end does not use such a parser. */
228 void (*set_yydebug) PARAMS ((int));
230 struct lang_hooks_for_tree_inlining tree_inlining;
232 struct lang_hooks_for_tree_dump tree_dump;
234 struct lang_hooks_for_decls decls;
236 /* Whenever you add entries here, make sure you adjust langhooks-def.h
237 and langhooks.c accordingly. */
240 /* Each front end provides its own. */
241 extern const struct lang_hooks lang_hooks;
243 #endif /* GCC_LANG_HOOKS_H */