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/* The lang_hooks data structure.
Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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
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
<>. */
/* This file should be #include-d after tree.h. */
struct diagnostic_context;
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
/* 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);
struct lang_hooks_for_callgraph
/* The node passed is a language-specific tree node. If its contents
are relevant to use of other declarations, mark them. */
tree (*analyze_expr) (tree *, int *);
/* Emit thunks associated to function. */
void (*emit_associated_thunks) (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);
/* 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
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 *);
/* 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);
/* Nonzero if types that are identical are to be hashed so that only
one copy is kept. If a language requires unique types for each
user-specified type, such as Ada, this should be set to TRUE. */
bool hash_types;
/* Language hooks related to decls and the symbol table. */
struct lang_hooks_for_decls
/* Returns nonzero if we are in the global binding level. Ada
returns -1 for an undocumented reason used in stor-layout.c. */
int (*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 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);
/* Return the COMDAT group into which this DECL should be placed.
It is known that the DECL belongs in *some* COMDAT group when
this hook is called. The return value will be used immediately,
but not explicitly deallocated, so implementations should not use
xmalloc to allocate the string returned. (Typically, the return
value will be the string already stored in an
const char * (*comdat_group) (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 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
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-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;
/* 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);
/* The first callback made to the front end, for simple
initialization needed before any calls to handle_option. Return
the language mask to filter the switch array with. */
unsigned int (*init_options) (unsigned int argc, const char **argv);
/* Callback used to perform language-specific initialization for the
global diagnostic context structure. */
void (*initialize_diagnostics) (struct diagnostic_context *);
/* 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.
Return 1 if the switch is valid, 0 if invalid, and -1 if it's
valid and should not be treated as language-independent too. */
int (*handle_option) (size_t code, const char *arg, int value);
/* Return false to use the default complaint about a missing
argument, otherwise output a complaint and return true. */
bool (*missing_argument) (const char *opt, size_t code);
/* 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. The argument is nonzero to cause bison
parsers to dump debugging information during parsing. */
void (*parse_file) (int);
/* 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);
/* Called by expand_expr for language-specific tree codes.
Fourth argument is actually an enum expand_modifier. */
rtx (*expand_expr) (tree, rtx, enum machine_mode, int, rtx *);
/* Function to finish handling an incomplete decl at the end of
compilation. Default hook is does nothing. */
void (*finish_incomplete_decl) (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) (tree);
/* Hook called by staticp for language-specific tree codes. */
tree (*staticp) (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
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++. */
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) (struct diagnostic_context *, const char *,
struct diagnostic_info *);
/* Called from expr_size to calculate the size of the value of an
expression in a language-dependent way. Returns a tree for the size
in bytes. A frontend can call lhd_expr_size to get the default
semantics in cases that it doesn't want to handle specially. */
tree (*expr_size) (const_tree);
/* 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_callgraph callgraph;
struct lang_hooks_for_tree_dump tree_dump;
struct lang_hooks_for_decls decls;
struct lang_hooks_for_types types;
/* 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 *);
/* Fold an OBJ_TYPE_REF expression to the address of a function.
KNOWN_TYPE carries the true type of the OBJ_TYPE_REF_OBJECT. */
tree (*fold_obj_type_ref) (tree, tree);
/* 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);
/* 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;
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);
#endif /* GCC_LANG_HOOKS_H */