-/* Default macros to initialize the lang_hooks data structure.
- Copyright 2001 Free Software Foundation, Inc.
- Contributed by Alexandre Oliva <aoliva@redhat.com>
+/* The lang_hooks data structure.
+ Copyright 2001, 2002 Free Software Foundation, Inc.
This file is part of GNU CC.
#ifndef GCC_LANG_HOOKS_H
#define GCC_LANG_HOOKS_H
-/* Provide a hook routine for alias sets that always returns 1. This is
- used by languages that haven't deal with alias sets yet. */
-extern HOST_WIDE_INT hook_get_alias_set_0 PARAMS ((tree));
-
-/* Note to creators of new hooks:
-
- The macros in this file should NOT be surrounded by a
- #ifdef...#endif pair, since this file declares the defaults. Each
- front end overrides any hooks it wishes to, in the file containing
- its struct lang_hooks, AFTER including this file. */
-
-/* See toplev.h for the definition and documentation of each hook. */
-
-extern void lang_hook_default_do_nothing PARAMS ((void));
-extern int lang_hook_default_decode_option PARAMS ((int, char **));
-extern HOST_WIDE_INT lang_hook_default_get_alias_set PARAMS ((tree));
-
-#define LANG_HOOKS_INIT lang_hook_default_do_nothing
-#define LANG_HOOKS_FINISH lang_hook_default_do_nothing
-#define LANG_HOOKS_INIT_OPTIONS lang_hook_default_do_nothing
-#define LANG_HOOKS_DECODE_OPTION lang_hook_default_decode_option
-#define LANG_HOOKS_POST_OPTIONS lang_hook_default_do_nothing
-#define LANG_HOOKS_GET_ALIAS_SET lang_hook_default_get_alias_set
-
-#define LANG_HOOKS_HONOR_READONLY false
-
-/* Declarations of default tree inlining hooks. */
-tree tree_inlining_default_hook_walk_subtrees PARAMS ((tree *, int *,
- walk_tree_fn,
- void *,
- void *));
-int tree_inlining_default_hook_cannot_inline_tree_fn PARAMS ((tree *));
-int tree_inlining_default_hook_disregard_inline_limits PARAMS ((tree));
-tree tree_inlining_default_hook_add_pending_fn_decls PARAMS ((void *,
- tree));
-int tree_inlining_default_hook_tree_chain_matters_p PARAMS ((tree));
-int tree_inlining_default_hook_auto_var_in_fn_p PARAMS ((tree, tree));
-tree tree_inlining_default_hook_copy_res_decl_for_inlining PARAMS ((tree, tree,
- tree,
- void *,
- int *,
- void *));
-int tree_inlining_default_hook_anon_aggr_type_p PARAMS ((tree));
-
-/* Tree inlining hooks. */
-#define LANG_HOOKS_TREE_INLINING_WALK_SUBTREES \
- tree_inlining_default_hook_walk_subtrees
-#define LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN \
- tree_inlining_default_hook_cannot_inline_tree_fn
-#define LANG_HOOKS_TREE_INLINING_DISREGARD_INLINE_LIMITS \
- tree_inlining_default_hook_disregard_inline_limits
-#define LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS \
- tree_inlining_default_hook_add_pending_fn_decls
-#define LANG_HOOKS_TREE_INLINING_TREE_CHAIN_MATTERS_P \
- tree_inlining_default_hook_tree_chain_matters_p
-#define LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P \
- tree_inlining_default_hook_auto_var_in_fn_p
-#define LANG_HOOKS_TREE_INLINING_COPY_RES_DECL_FOR_INLINING \
- tree_inlining_default_hook_copy_res_decl_for_inlining
-#define LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P \
- tree_inlining_default_hook_anon_aggr_type_p
-
-#define LANG_HOOKS_TREE_INLINING_INITIALIZER { \
- LANG_HOOKS_TREE_INLINING_WALK_SUBTREES, \
- LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN, \
- LANG_HOOKS_TREE_INLINING_DISREGARD_INLINE_LIMITS, \
- LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS, \
- LANG_HOOKS_TREE_INLINING_TREE_CHAIN_MATTERS_P, \
- LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P, \
- LANG_HOOKS_TREE_INLINING_COPY_RES_DECL_FOR_INLINING, \
- LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P \
-} \
-
-/* The whole thing. The structure is defined in toplev.h. */
-#define LANG_HOOKS_INITIALIZER { \
- LANG_HOOKS_INIT, \
- LANG_HOOKS_FINISH, \
- LANG_HOOKS_INIT_OPTIONS, \
- LANG_HOOKS_DECODE_OPTION, \
- LANG_HOOKS_POST_OPTIONS, \
- LANG_HOOKS_GET_ALIAS_SET, \
- LANG_HOOKS_HONOR_READONLY, \
- LANG_HOOKS_TREE_INLINING_INITIALIZER \
-}
+/* This file should be #include-d after tree.h. */
+
+struct diagnostic_context;
+
+/* A print hook for print_tree (). */
+typedef void (*lang_print_tree_hook) PARAMS ((FILE *, tree, int indent));
+
+/* The following hooks are documented in langhooks.c. Must not be
+ NULL. */
+
+struct lang_hooks_for_tree_inlining
+{
+ union tree_node *(*walk_subtrees) PARAMS ((union tree_node **, int *,
+ union tree_node *(*)
+ (union tree_node **,
+ int *, void *),
+ void *, void *));
+ int (*cannot_inline_tree_fn) PARAMS ((union tree_node **));
+ int (*disregard_inline_limits) PARAMS ((union tree_node *));
+ union tree_node *(*add_pending_fn_decls) PARAMS ((void *,
+ union tree_node *));
+ int (*tree_chain_matters_p) PARAMS ((union tree_node *));
+ int (*auto_var_in_fn_p) PARAMS ((union tree_node *, union tree_node *));
+ union tree_node *(*copy_res_decl_for_inlining) PARAMS ((union tree_node *,
+ union tree_node *,
+ union tree_node *,
+ void *, int *,
+ void *));
+ int (*anon_aggr_type_p) PARAMS ((union tree_node *));
+ int (*start_inlining) PARAMS ((union tree_node *));
+ void (*end_inlining) PARAMS ((union tree_node *));
+ union tree_node *(*convert_parm_for_inlining) PARAMS ((union tree_node *,
+ union tree_node *,
+ union tree_node *));
+};
+
+/* Lang hooks for management of language-specific data or status
+ when entering / leaving functions etc. */
+struct lang_hooks_for_functions
+{
+ /* Called when entering a function. */
+ void (*init) PARAMS ((struct function *));
+
+ /* Called when leaving a function. */
+ void (*final) PARAMS ((struct function *));
+
+ /* Called when entering a nested function. */
+ void (*enter_nested) PARAMS ((struct function *));
+
+ /* Called when leaving a nested function. */
+ void (*leave_nested) PARAMS ((struct function *));
+};
+
+/* The following hooks are used by tree-dump.c. */
+
+struct lang_hooks_for_tree_dump
+{
+ /* Dump language-specific parts of tree nodes. Returns non-zero if it
+ does not want the usual dumping of the second argument. */
+ int (*dump_tree) PARAMS ((void *, tree));
+
+ /* Determine type qualifiers in a language-specific way. */
+ int (*type_quals) PARAMS ((tree));
+};
+
+/* Hooks related to types. */
+
+struct lang_hooks_for_types
+{
+ /* Return a new type (with the indicated CODE), doing whatever
+ language-specific processing is required. */
+ tree (*make_type) PARAMS ((enum tree_code));
+
+ /* Given MODE and UNSIGNEDP, return a suitable type-tree with that
+ mode. */
+ tree (*type_for_mode) PARAMS ((enum machine_mode, int));
+
+ /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an
+ integer type with at least that precision. */
+ tree (*type_for_size) PARAMS ((unsigned, int));
+
+ /* Given an integer type T, return a type like T but unsigned.
+ If T is unsigned, the value is T. */
+ tree (*unsigned_type) PARAMS ((tree));
+
+ /* Given an integer type T, return a type like T but signed.
+ If T is signed, the value is T. */
+ tree (*signed_type) PARAMS ((tree));
+
+ /* Return a type the same as TYPE except unsigned or signed
+ according to UNSIGNEDP. */
+ tree (*signed_or_unsigned_type) PARAMS ((int, tree));
+
+ /* Given a type, apply default promotions to unnamed function
+ arguments and return the new type. Return the same type if no
+ change. Required by any language that supports variadic
+ arguments. The default hook aborts. */
+ tree (*type_promotes_to) PARAMS ((tree));
+
+ /* This routine is called in tree.c to print an error message for
+ invalid use of an incomplete type. VALUE is the expression that
+ was used (or 0 if that isn't known) and TYPE is the type that was
+ invalid. */
+ void (*incomplete_type_error) PARAMS ((tree value, tree type));
+};
+
+/* Language hooks related to decls and the symbol table. */
+
+struct lang_hooks_for_decls
+{
+ /* Enter a new lexical scope. Argument is always zero when called
+ from outside the front end. */
+ void (*pushlevel) PARAMS ((int));
+
+ /* Exit a lexical scope and return a BINDING for that scope.
+ Takes three arguments:
+ KEEP -- nonzero if there were declarations in this scope.
+ REVERSE -- reverse the order of decls before returning them.
+ FUNCTIONBODY -- nonzero if this level is the body of a function. */
+ tree (*poplevel) PARAMS ((int, int, int));
+
+ /* Returns non-zero if we are in the global binding level. Ada
+ returns -1 for an undocumented reason used in stor-layout.c. */
+ int (*global_bindings_p) PARAMS ((void));
+
+ /* Insert BLOCK at the end of the list of subblocks of the
+ current binding level. This is used when a BIND_EXPR is expanded,
+ to handle the BLOCK node inside the BIND_EXPR. */
+ void (*insert_block) PARAMS ((tree));
+
+ /* Set the BLOCK node for the current scope level. */
+ void (*set_block) PARAMS ((tree));
+
+ /* Function to add a decl to the current scope level. Takes one
+ argument, a decl to add. Returns that decl, or, if the same
+ symbol is already declared, may return a different decl for that
+ name. */
+ tree (*pushdecl) PARAMS ((tree));
+
+ /* Returns the chain of decls so far in the current scope level. */
+ tree (*getdecls) PARAMS ((void));
+
+ /* Returns true when we should warn for an unused global DECL.
+ We will already have checked that it has static binding. */
+ bool (*warn_unused_global) PARAMS ((tree));
+};
+
+/* Language-specific hooks. See langhooks-def.h for defaults. */
+
+struct lang_hooks
+{
+ /* String identifying the front end. e.g. "GNU C++". */
+ const char *name;
+
+ /* sizeof (struct lang_identifier), so make_node () creates
+ identifier nodes long enough for the language-specific slots. */
+ size_t identifier_size;
+
+ /* The first callback made to the front end, for simple
+ initialization needed before any calls to decode_option. */
+ void (*init_options) PARAMS ((void));
+
+ /* Function called with an option vector as argument, to decode a
+ single option (typically starting with -f or -W or +). It should
+ return the number of command-line arguments it uses if it handles
+ the option, or 0 and not complain if it does not recognise the
+ option. If this function returns a negative number, then its
+ absolute value is the number of command-line arguments used, but,
+ in addition, no language-independent option processing should be
+ done for this option. */
+ int (*decode_option) PARAMS ((int, char **));
+
+ /* Called when all command line options have been parsed. Should do
+ any required consistency checks, modifications etc. Complex
+ initialization should be left to the "init" callback, since GC
+ and the identifier hashes are set up between now and then.
+
+ If errorcount is non-zero after this call the compiler exits
+ immediately and the finish hook is not called. */
+ void (*post_options) PARAMS ((void));
+
+ /* Called after post_options, to initialize the front end. The main
+ input filename is passed, which may be NULL; the front end should
+ return the original filename (e.g. foo.i -> foo.c). Return NULL
+ to indicate a serious error of some sort; in that case no
+ compilation is performed, and the finish hook is called
+ immediately. */
+ const char * (*init) PARAMS ((const char *));
+
+ /* Called at the end of compilation, as a finalizer. */
+ void (*finish) PARAMS ((void));
+
+ /* Parses the entire file. The argument is non-zero to cause bison
+ parsers to dump debugging information during parsing. */
+ void (*parse_file) PARAMS ((int));
+
+ /* Called immediately after parsing to clear the binding stack. */
+ void (*clear_binding_stack) PARAMS ((void));
+
+ /* Called to obtain the alias set to be used for an expression or type.
+ Returns -1 if the language does nothing special for it. */
+ HOST_WIDE_INT (*get_alias_set) PARAMS ((tree));
+
+ /* Called with an expression that is to be processed as a constant.
+ Returns either the same expression or a language-independent
+ constant equivalent to its input. */
+ tree (*expand_constant) PARAMS ((tree));
+
+ /* Called by expand_expr for language-specific tree codes.
+ Fourth argument is actually an enum expand_modifier. */
+ rtx (*expand_expr) PARAMS ((tree, rtx, enum machine_mode, int));
+
+ /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical
+ operation.
+
+ This preparation consists of taking the ordinary representation
+ of an expression expr and producing a valid tree boolean
+ expression describing whether expr is nonzero. We could simply
+ always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1),
+ but we optimize comparisons, &&, ||, and !.
+
+ The result should be an expression of boolean type (if not an
+ error_mark_node). */
+ tree (*truthvalue_conversion) PARAMS ((tree));
+
+ /* Possibly apply default attributes to a function (represented by
+ a FUNCTION_DECL). */
+ void (*insert_default_attributes) PARAMS ((tree));
+
+ /* Hook called by safe_from_p for language-specific tree codes. It is
+ up to the language front-end to install a hook if it has any such
+ codes that safe_from_p needs to know about. Since same_from_p will
+ recursively explore the TREE_OPERANDs of an expression, this hook
+ should not reexamine those pieces. This routine may recursively
+ call safe_from_p; it should always pass `0' as the TOP_P
+ parameter. */
+ int (*safe_from_p) PARAMS ((rtx, tree));
+
+ /* Function to finish handling an incomplete decl at the end of
+ compilation. Default hook is does nothing. */
+ void (*finish_incomplete_decl) PARAMS ((tree));
+
+ /* Function used by unsafe_for_reeval. A non-negative number is
+ returned directly from unsafe_for_reeval, a negative number falls
+ through. The default hook returns a negative number. */
+ int (*unsafe_for_reeval) PARAMS ((tree));
+
+ /* Mark EXP saying that we need to be able to take the address of
+ it; it should not be allocated in a register. Return true if
+ successful. */
+ bool (*mark_addressable) PARAMS ((tree));
+
+ /* Hook called by staticp for language-specific tree codes. */
+ int (*staticp) PARAMS ((tree));
+
+ /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
+ DECL_NODE with a newly GC-allocated copy. */
+ void (*dup_lang_specific_decl) PARAMS ((tree));
+
+ /* Called before its argument, an UNSAVE_EXPR, is to be
+ unsaved. Modify it in-place so that all the evaluate only once
+ things are cleared out. */
+ tree (*unsave_expr_now) PARAMS ((tree));
+
+ /* Called by expand_expr to build and return the cleanup-expression
+ for the passed TARGET_EXPR. Return NULL if there is none. */
+ tree (*maybe_build_cleanup) PARAMS ((tree));
+
+ /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of
+ thing that the assembler should talk about, set
+ DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE.
+ Otherwise, set it to the ERROR_MARK_NODE to ensure that the
+ assembler does not talk about it. */
+ void (*set_decl_assembler_name) PARAMS ((tree));
+
+ /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */
+ bool honor_readonly;
+
+ /* The front end can add its own statistics to -fmem-report with
+ this hook. It should output to stderr. */
+ void (*print_statistics) PARAMS ((void));
+
+ /* Called by print_tree when there is a tree of class 'x' that it
+ doesn't know how to display. */
+ lang_print_tree_hook print_xnode;
+
+ /* Called to print language-dependent parts of a class 'd', class
+ 't', and IDENTIFIER_NODE nodes. */
+ lang_print_tree_hook print_decl;
+ lang_print_tree_hook print_type;
+ lang_print_tree_hook print_identifier;
+
+ /* Computes the name to use to print a declaration. DECL is the
+ non-NULL declaration in question. VERBOSITY determines what
+ information will be printed: 0: DECL_NAME, demangled as
+ necessary. 1: and scope information. 2: and any other
+ information that might be interesting, such as function parameter
+ types in C++. */
+ const char *(*decl_printable_name) PARAMS ((tree decl, int verbosity));
+
+ /* Called by report_error_function to print out function name. */
+ void (*print_error_function) PARAMS ((struct diagnostic_context *,
+ const char *));
+
+ /* Pointers to machine-independent attribute tables, for front ends
+ using attribs.c. If one is NULL, it is ignored. Respectively, a
+ table of attributes specific to the language, a table of
+ attributes common to two or more languages (to allow easy
+ sharing), and a table of attributes for checking formats. */
+ const struct attribute_spec *attribute_table;
+ const struct attribute_spec *common_attribute_table;
+ const struct attribute_spec *format_attribute_table;
+
+ /* Function-related language hooks. */
+ struct lang_hooks_for_functions function;
+
+ struct lang_hooks_for_tree_inlining tree_inlining;
+
+ struct lang_hooks_for_tree_dump tree_dump;
+
+ struct lang_hooks_for_decls decls;
+
+ struct lang_hooks_for_types types;
+
+ /* Whenever you add entries here, make sure you adjust langhooks-def.h
+ and langhooks.c accordingly. */
+};
+
+/* Each front end provides its own. */
+extern const struct lang_hooks lang_hooks;
#endif /* GCC_LANG_HOOKS_H */
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