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/* The lang_hooks data structure.

   Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007

   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

<http://www.gnu.org/licenses/>.  */

#ifndef GCC_LANG_HOOKS_H

#define GCC_LANG_HOOKS_H

/* This file should be #include-d after tree.h.  */

struct diagnostic_context;

struct gimplify_omp_ctx;

/* A print hook for print_tree ().  */

typedef void (*lang_print_tree_hook) (FILE *, tree, int indent);

/* The following hooks are documented in langhooks.c.  Must not be

   NULL.  */

struct lang_hooks_for_tree_inlining

{

  tree (*walk_subtrees) (tree *, int *,

                         tree (*) (tree *, int *, void *),

                         void *, struct pointer_set_t*);

  int (*cannot_inline_tree_fn) (tree *);

  int (*disregard_inline_limits) (tree);

  tree (*add_pending_fn_decls) (void *, tree);

  int (*auto_var_in_fn_p) (tree, tree);

  int (*anon_aggr_type_p) (tree);

  bool (*var_mod_type_p) (tree, tree);

  int (*start_inlining) (tree);

  void (*end_inlining) (tree);

  tree (*convert_parm_for_inlining) (tree, tree, tree, int);

};

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 *, tree);

  /* Produce RTL for function passed as argument.  */

  void (*expand_function) (tree);

};

/* 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) (struct function *);

  /* Called when leaving a function.  */

  void (*final) (struct function *);

  /* Called when entering a nested function.  */

  void (*enter_nested) (struct function *);

  /* Called when leaving a nested function.  */

  void (*leave_nested) (struct function *);

  /* Determines if it's ok for a function to have no noreturn attribute.  */

  bool (*missing_noreturn_ok_p) (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) (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);

  /* 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);

  /* Given an integer type T, return a type like T but unsigned.

     If T is unsigned, the value is T.  */

  tree (*unsigned_type) (tree);

  /* Given an integer type T, return a type like T but signed.

     If T is signed, the value is T.  */

  tree (*signed_type) (tree);

  /* Return a type the same as TYPE except unsigned or signed

     according to UNSIGNEDP.  */

  tree (*signed_or_unsigned_type) (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 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) (tree value, tree type);

  /* Called from assign_temp to return the maximum size, if there is one,

     for a type.  */

  tree (*max_size) (tree);

  /* Register language specific type size variables as potentially OpenMP

     firstprivate variables.  */

  void (*omp_firstprivatize_type_sizes) (struct gimplify_omp_ctx *, 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);

  /* 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) (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) (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) (tree);

  /* Obtain a list of globals and do final output on them at end

     of compilation */

  void (*final_write_globals) (void);

  /* Do necessary preparations before assemble_variable can proceed.  */

  void (*prepare_assemble_variable) (tree);

  /* True if this decl may be called via a sibcall.  */

  bool (*ok_for_sibcall) (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

     IDENTIFIER_NODE.)  */

  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) (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

     be put into OMP_CLAUSE_PRIVATE_DEBUG.  */

  bool (*omp_private_debug_clause) (tree, bool);

  /* Build and return code for a default constructor for DECL in

     response to CLAUSE.  Return NULL if nothing to be done.  */

  tree (*omp_clause_default_ctor) (tree clause, tree decl);

  /* 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);

};

/* 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);

  /* Called immediately after parsing to clear the binding stack.  */

  void (*clear_binding_stack) (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) (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) (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 *);

  /* Called by expand_expr to generate the definition of a decl.  Returns

     1 if handled, 0 otherwise.  */

  int (*expand_decl) (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) (rtx, tree);

  /* 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

     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);

  /* Return nonzero if fold-const is free to use bit-field

     optimizations, for instance in fold_truthop().  */

  bool (*can_use_bit_fields_p) (void);

  /* Nonzero if operations on types narrower than their mode should

     have their results reduced to the precision of the type.  */

  bool reduce_bit_field_operations;

  /* Nonzero if this front end does not generate a dummy BLOCK between

     the outermost scope of the function and the FUNCTION_DECL.  See

     is_body_block in stmt.c, and its callers.  */

  bool no_body_blocks;

  /* 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);

  /* Given a CALL_EXPR, return a function decl that is its target.  */

  tree (*lang_get_callee_fndecl) (tree);

  /* Called by report_error_function to print out function name.  */

  void (*print_error_function) (struct diagnostic_context *, const char *);

  /* 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) (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;

  /* Function-related language hooks.  */

  struct lang_hooks_for_functions function;

  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 *, tree *, tree *);

  /* 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);

  /* Return a definition for a builtin function named NAME and whose data type

     is TYPE.  TYPE should be a function type with argument types.

     FUNCTION_CODE tells later passes how to compile calls to this function.

     See tree.h for its possible values.

     If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,

     the name to be called if we can't opencode the function.  If

     ATTRS is nonzero, use that for the function's attribute list.  */

  tree (*builtin_function) (const char *name, tree type, int function_code,

                            enum built_in_class bt_class,

                            const char *library_name, tree attrs);

  /* 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, *TI or

     *SE if in the process TREE_CONSTANT, TREE_INVARIANT or

     TREE_SIDE_EFFECTS need updating.  */

  tree (*expr_to_decl) (tree expr, bool *tc, bool *ti, 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;

#endif /* GCC_LANG_HOOKS_H */