/* The lang_hooks data structure. Copyright (C) 2001-2013 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see . */ #ifndef GCC_LANG_HOOKS_H #define GCC_LANG_HOOKS_H /* FIXME: This file should be #include-d after tree.h (for enum tree_code). */ struct diagnostic_info; struct gimplify_omp_ctx; struct array_descr_info; /* A print hook for print_tree (). */ typedef void (*lang_print_tree_hook) (FILE *, tree, int indent); enum classify_record { RECORD_IS_STRUCT, RECORD_IS_CLASS, RECORD_IS_INTERFACE }; /* The following hooks are documented in langhooks.c. Must not be NULL. */ struct lang_hooks_for_tree_inlining { bool (*var_mod_type_p) (tree, tree); }; /* The following hooks are used by tree-dump.c. */ struct lang_hooks_for_tree_dump { /* Dump language-specific parts of tree nodes. Returns nonzero if it does not want the usual dumping of the second argument. */ bool (*dump_tree) (void *, tree); /* Determine type qualifiers in a language-specific way. */ int (*type_quals) (const_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) (enum tree_code); /* Return what kind of RECORD_TYPE this is, mainly for purposes of debug information. If not defined, record types are assumed to be structures. */ enum classify_record (*classify_record) (tree); /* Given MODE and UNSIGNEDP, return a suitable type-tree with that mode. */ tree (*type_for_mode) (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) (unsigned, int); /* True if the type is an instantiation of a generic type, e.g. C++ template implicit specializations. */ bool (*generic_p) (const_tree); /* Returns the TREE_VEC of elements of a given generic argument pack. */ tree (*get_argument_pack_elems) (const_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 dies. */ tree (*type_promotes_to) (tree); /* Register TYPE as a builtin type with the indicated NAME. The TYPE is placed in the outermost lexical scope. The semantics should be analogous to: typedef TYPE NAME; in C. The default hook ignores the declaration. */ void (*register_builtin_type) (tree, const char *); /* 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) (const_tree value, const_tree type); /* Called from assign_temp to return the maximum size, if there is one, for a type. */ tree (*max_size) (const_tree); /* Register language specific type size variables as potentially OpenMP firstprivate variables. */ void (*omp_firstprivatize_type_sizes) (struct gimplify_omp_ctx *, tree); /* Return TRUE if TYPE1 and TYPE2 are identical for type hashing purposes. Called only after doing all language independent checks. At present, this function is only called when both TYPE1 and TYPE2 are FUNCTION_TYPEs. */ bool (*type_hash_eq) (const_tree, const_tree); /* Return TRUE if TYPE uses a hidden descriptor and fills in information for the debugger about the array bounds, strides, etc. */ bool (*get_array_descr_info) (const_tree, struct array_descr_info *); /* Fill in information for the debugger about the bounds of TYPE. */ void (*get_subrange_bounds) (const_tree, tree *, tree *); /* A type descriptive of TYPE's complex layout generated to help the debugger to decode variable-length or self-referential constructs. This is only used for the AT_GNAT_descriptive_type DWARF attribute. */ tree (*descriptive_type) (const_tree); /* If we requested a pointer to a vector, build up the pointers that we stripped off while looking for the inner type. Similarly for return values from functions. The argument TYPE is the top of the chain, and BOTTOM is the new type which we will point to. */ tree (*reconstruct_complex_type) (tree, tree); }; /* Language hooks related to decls and the symbol table. */ struct lang_hooks_for_decls { /* Return true if we are in the global binding level. This hook is really needed only if the language supports variable-sized types at the global level, i.e. declared outside subprograms. */ bool (*global_bindings_p) (void); /* 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) (tree); /* Returns the chain of decls so far in the current scope level. */ tree (*getdecls) (void); /* Returns true if DECL is explicit member function. */ bool (*function_decl_explicit_p) (tree); /* Returns True if the parameter is a generic parameter decl of a generic type, e.g a template template parameter for the C++ FE. */ bool (*generic_generic_parameter_decl_p) (const_tree); /* Determine if a function parameter got expanded from a function parameter pack. */ bool (*function_parm_expanded_from_pack_p) (tree, tree); /* Returns the generic declaration of a generic function instantiations. */ tree (*get_generic_function_decl) (const_tree); /* 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) (const_tree); /* Obtain a list of globals and do final output on them at end of compilation */ void (*final_write_globals) (void); /* True if this decl may be called via a sibcall. */ bool (*ok_for_sibcall) (const_tree); /* True if OpenMP should privatize what this DECL points to rather than the DECL itself. */ bool (*omp_privatize_by_reference) (const_tree); /* Return sharing kind if OpenMP sharing attribute of DECL is predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise. */ enum omp_clause_default_kind (*omp_predetermined_sharing) (tree); /* Return decl that should be reported for DEFAULT(NONE) failure diagnostics. Usually the DECL passed in. */ tree (*omp_report_decl) (tree); /* Return true if DECL's DECL_VALUE_EXPR (if any) should be disregarded in OpenMP construct, because it is going to be remapped during OpenMP lowering. SHARED is true if DECL is going to be shared, false if it is going to be privatized. */ bool (*omp_disregard_value_expr) (tree, bool); /* Return true if DECL that is shared iff SHARED is true should be put into OMP_CLAUSE_PRIVATE_DEBUG. */ bool (*omp_private_debug_clause) (tree, bool); /* Return true if DECL in private clause needs OMP_CLAUSE_PRIVATE_OUTER_REF on the private clause. */ bool (*omp_private_outer_ref) (tree); /* Build and return code for a default constructor for DECL in response to CLAUSE. OUTER is corresponding outer region's variable if needed. Return NULL if nothing to be done. */ tree (*omp_clause_default_ctor) (tree clause, tree decl, tree outer); /* Build and return code for a copy constructor from SRC to DST. */ tree (*omp_clause_copy_ctor) (tree clause, tree dst, tree src); /* Similarly, except use an assignment operator instead. */ tree (*omp_clause_assign_op) (tree clause, tree dst, tree src); /* Build and return code destructing DECL. Return NULL if nothing to be done. */ tree (*omp_clause_dtor) (tree clause, tree decl); /* Do language specific checking on an implicitly determined clause. */ void (*omp_finish_clause) (tree clause); }; /* Language hooks related to LTO serialization. */ struct lang_hooks_for_lto { /* Begin a new LTO section named NAME. */ void (*begin_section) (const char *name); /* Write DATA of length LEN to the currently open LTO section. BLOCK is a pointer to the dynamically allocated memory containing DATA. The append_data function is responsible for freeing it when it is no longer needed. */ void (*append_data) (const void *data, size_t len, void *block); /* End the previously begun LTO section. */ void (*end_section) (void); }; /* 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; /* Remove any parts of the tree that are used only by the FE. */ void (*free_lang_data) (tree); /* Determines the size of any language-specific tcc_constant or tcc_exceptional nodes. Since it is called from make_node, the only information available is the tree code. Expected to die on unrecognized codes. */ size_t (*tree_size) (enum tree_code); /* Return the language mask used for converting argv into a sequence of options. */ unsigned int (*option_lang_mask) (void); /* Initialize variables in an options structure. */ void (*init_options_struct) (struct gcc_options *opts); /* After the initialize_diagnostics hook is called, do any simple initialization needed before any calls to handle_option, other than that done by the init_options_struct hook. */ void (*init_options) (unsigned int decoded_options_count, struct cl_decoded_option *decoded_options); /* Callback used to perform language-specific initialization for the global diagnostic context structure. */ void (*initialize_diagnostics) (diagnostic_context *); /* Return true if a warning should be given about option OPTION, which is for the wrong language, false if it should be quietly ignored. */ bool (*complain_wrong_lang_p) (const struct cl_option *option); /* Handle the switch CODE, which has real type enum opt_code from options.h. If the switch takes an argument, it is passed in ARG which points to permanent storage. The handler is responsible for checking whether ARG is NULL, which indicates that no argument was in fact supplied. For -f and -W switches, VALUE is 1 or 0 for the positive and negative forms respectively. HANDLERS should be passed to any recursive handle_option calls. LOC is the location of the option. Return true if the switch is valid, false if invalid. */ bool (*handle_option) (size_t code, const char *arg, int value, int kind, location_t loc, const struct cl_option_handlers *handlers); /* Called when all command line options have been parsed to allow further processing and initialization Should return true to indicate that a compiler back-end is not required, such as with the -E option. If errorcount is nonzero after this call the compiler exits immediately and the finish hook is not called. */ bool (*post_options) (const char **); /* Called after post_options to initialize the front end. Return false to indicate that no further compilation be performed, in which case the finish hook is called immediately. */ bool (*init) (void); /* Called at the end of compilation, as a finalizer. */ void (*finish) (void); /* Parses the entire file. */ void (*parse_file) (void); /* Determines if it's ok for a function to have no noreturn attribute. */ bool (*missing_noreturn_ok_p) (tree); /* Called to obtain the alias set to be used for an expression or type. Returns -1 if the language does nothing special for it. */ alias_set_type (*get_alias_set) (tree); /* Function to finish handling an incomplete decl at the end of compilation. Default hook is does nothing. */ void (*finish_incomplete_decl) (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) (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) (tree); /* The front end can add its own statistics to -fmem-report with this hook. It should output to stderr. */ void (*print_statistics) (void); /* Called by print_tree when there is a tree of class tcc_exceptional that it doesn't know how to display. */ lang_print_tree_hook print_xnode; /* Called to print language-dependent parts of tcc_decl, tcc_type, 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++. The name is in the internal character set and needs to be converted to the locale character set of diagnostics, or to the execution character set for strings such as __PRETTY_FUNCTION__. */ const char *(*decl_printable_name) (tree decl, int verbosity); /* Computes the dwarf-2/3 name for a tree. VERBOSITY determines what information will be printed: 0: DECL_NAME, demangled as necessary. 1: and scope information. */ const char *(*dwarf_name) (tree, int verbosity); /* This compares two types for equivalence ("compatible" in C-based languages). This routine should only return 1 if it is sure. It should not be used in contexts where erroneously returning 0 causes problems. */ int (*types_compatible_p) (tree x, tree y); /* Called by report_error_function to print out function name. */ void (*print_error_function) (diagnostic_context *, const char *, struct diagnostic_info *); /* Convert a character from the host's to the target's character set. The character should be in what C calls the "basic source character set" (roughly, the set of characters defined by plain old ASCII). The default is to return the character unchanged, which is correct in most circumstances. Note that both argument and result should be sign-extended under -fsigned-char, zero-extended under -fno-signed-char. */ HOST_WIDE_INT (*to_target_charset) (HOST_WIDE_INT); /* 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; 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; struct lang_hooks_for_lto lto; /* Returns the generic parameters of an instantiation of a generic type or decl, e.g. C++ template instantiation. */ tree (*get_innermost_generic_parms) (const_tree); /* Returns the TREE_VEC of arguments of an instantiation of a generic type of decl, e.g. C++ template instantiation. */ tree (*get_innermost_generic_args) (const_tree); /* Determine if a tree is a function parameter pack. */ bool (*function_parameter_pack_p) (const_tree); /* Perform language-specific gimplification on the argument. Returns an enum gimplify_status, though we can't see that type here. */ int (*gimplify_expr) (tree *, gimple_seq *, gimple_seq *); /* Do language specific processing in the builtin function DECL */ tree (*builtin_function) (tree decl); /* Like builtin_function, but make sure the scope is the external scope. This is used to delay putting in back end builtin functions until the ISA that defines the builtin is declared via function specific target options, which can save memory for machines like the x86_64 that have multiple ISAs. If this points to the same function as builtin_function, the backend must add all of the builtins at program initialization time. */ tree (*builtin_function_ext_scope) (tree decl); /* Used to set up the tree_contains_structure array for a frontend. */ void (*init_ts) (void); /* Called by recompute_tree_invariant_for_addr_expr to go from EXPR to a contained expression or DECL, possibly updating *TC or *SE if in the process TREE_CONSTANT or TREE_SIDE_EFFECTS need updating. */ tree (*expr_to_decl) (tree expr, bool *tc, bool *se); /* The EH personality function decl. */ tree (*eh_personality) (void); /* Map a type to a runtime object to match type. */ tree (*eh_runtime_type) (tree); /* If non-NULL, this is a function that returns a function decl to be executed if an unhandled exception is propagated out of a cleanup region. For example, in C++, an exception thrown by a destructor during stack unwinding is required to result in a call to `std::terminate', so the C++ version of this function returns a FUNCTION_DECL for `std::terminate'. */ tree (*eh_protect_cleanup_actions) (void); /* Return true if a stmt can fallthru. Used by block_may_fallthru to possibly handle language trees. */ bool (*block_may_fallthru) (const_tree); /* True if this language uses __cxa_end_cleanup when the ARM EABI is enabled. */ bool eh_use_cxa_end_cleanup; /* True if this language requires deep unsharing of tree nodes prior to gimplification. */ bool deep_unsharing; /* Whenever you add entries here, make sure you adjust langhooks-def.h and langhooks.c accordingly. */ }; /* Each front end provides its own. */ extern struct lang_hooks lang_hooks; extern tree add_builtin_function (const char *name, tree type, int function_code, enum built_in_class cl, const char *library_name, tree attrs); extern tree add_builtin_function_ext_scope (const char *name, tree type, int function_code, enum built_in_class cl, const char *library_name, tree attrs); extern tree add_builtin_type (const char *name, tree type); #endif /* GCC_LANG_HOOKS_H */