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/* Default language-specific hooks.

   Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009

   Free Software Foundation, Inc.

   Contributed by Alexandre Oliva  <aoliva@redhat.com>

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/>.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "intl.h"

#include "tm.h"

#include "toplev.h"

#include "tree.h"

#include "tree-inline.h"

#include "gimple.h"

#include "rtl.h"

#include "insn-config.h"

#include "integrate.h"

#include "flags.h"

#include "langhooks.h"

#include "target.h"

#include "langhooks-def.h"

#include "ggc.h"

#include "diagnostic.h"

#include "cgraph.h"

#include "output.h"

/* Do nothing; in many cases the default hook.  */

void

lhd_do_nothing (void)

{

}

/* Do nothing (tree).  */

void

lhd_do_nothing_t (tree ARG_UNUSED (t))

{

}

/* Pass through (tree).  */

tree

lhd_pass_through_t (tree t)

{

  return t;

}

/* Do nothing (int).  */

void

lhd_do_nothing_i (int ARG_UNUSED (i))

{

}

/* Do nothing (int, int, int).  Return NULL_TREE.  */

tree

lhd_do_nothing_iii_return_null_tree (int ARG_UNUSED (i),

                                     int ARG_UNUSED (j),

                                     int ARG_UNUSED (k))

{

  return NULL_TREE;

}

/* Do nothing (function).  */

void

lhd_do_nothing_f (struct function * ARG_UNUSED (f))

{

}

/* Do nothing (return NULL_TREE).  */

tree

lhd_return_null_tree_v (void)

{

  return NULL_TREE;

}

/* Do nothing (return NULL_TREE).  */

tree

lhd_return_null_tree (tree ARG_UNUSED (t))

{

  return NULL_TREE;

}

/* Do nothing (return NULL_TREE).  */

tree

lhd_return_null_const_tree (const_tree ARG_UNUSED (t))

{

  return NULL_TREE;

}

/* The default post options hook.  */

bool

lhd_post_options (const char ** ARG_UNUSED (pfilename))

{

  /* Excess precision other than "fast" requires front-end

     support.  */

  flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;

  return false;

}

/* Called from by print-tree.c.  */

void

lhd_print_tree_nothing (FILE * ARG_UNUSED (file),

                        tree ARG_UNUSED (node),

                        int ARG_UNUSED (indent))

{

}

/* Called from check_global_declarations.  */

bool

lhd_warn_unused_global_decl (const_tree decl)

{

  /* This is what used to exist in check_global_declarations.  Probably

     not many of these actually apply to non-C languages.  */

  if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))

    return false;

  if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl))

    return false;

  if (DECL_IN_SYSTEM_HEADER (decl))

    return false;

  return true;

}

/* Set the DECL_ASSEMBLER_NAME for DECL.  */

void

lhd_set_decl_assembler_name (tree decl)

{

  tree id;

  /* The language-independent code should never use the

     DECL_ASSEMBLER_NAME for lots of DECLs.  Only FUNCTION_DECLs and

     VAR_DECLs for variables with static storage duration need a real

     DECL_ASSEMBLER_NAME.  */

  gcc_assert (TREE_CODE (decl) == FUNCTION_DECL

              || (TREE_CODE (decl) == VAR_DECL

                  && (TREE_STATIC (decl)

                      || DECL_EXTERNAL (decl)

                      || TREE_PUBLIC (decl))));

  /* By default, assume the name to use in assembly code is the same

     as that used in the source language.  (That's correct for C, and

     GCC used to set DECL_ASSEMBLER_NAME to the same value as

     DECL_NAME in build_decl, so this choice provides backwards

     compatibility with existing front-ends.  This assumption is wrapped

     in a target hook, to allow for target-specific modification of the

     identifier.

     Can't use just the variable's own name for a variable whose scope

     is less than the whole compilation.  Concatenate a distinguishing

     number - we use the DECL_UID.  */

  if (TREE_PUBLIC (decl) || DECL_CONTEXT (decl) == NULL_TREE)

    id = targetm.mangle_decl_assembler_name (decl, DECL_NAME (decl));

  else

    {

      const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));

      char *label;

      ASM_FORMAT_PRIVATE_NAME (label, name, DECL_UID (decl));

      id = get_identifier (label);

    }

  SET_DECL_ASSEMBLER_NAME (decl, id);

}

/* Type promotion for variable arguments.  */

tree

lhd_type_promotes_to (tree ARG_UNUSED (type))

{

  gcc_unreachable ();

}

/* Registration of machine- or os-specific builtin types.  */

void

lhd_register_builtin_type (tree ARG_UNUSED (type),

                           const char * ARG_UNUSED (name))

{

}

/* Invalid use of an incomplete type.  */

void

lhd_incomplete_type_error (const_tree ARG_UNUSED (value), const_tree type)

{

  gcc_assert (TREE_CODE (type) == ERROR_MARK);

  return;

}

/* Provide a default routine for alias sets that always returns -1.  This

   is used by languages that don't need to do anything special.  */

alias_set_type

lhd_get_alias_set (tree ARG_UNUSED (t))

{

  return -1;

}

/* This is the default decl_printable_name function.  */

const char *

lhd_decl_printable_name (tree decl, int ARG_UNUSED (verbosity))

{

  gcc_assert (decl && DECL_NAME (decl));

  return IDENTIFIER_POINTER (DECL_NAME (decl));

}

/* This is the default dwarf_name function.  */

const char *

lhd_dwarf_name (tree t, int verbosity)

{

  gcc_assert (DECL_P (t));

  return lang_hooks.decl_printable_name (t, 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

lhd_types_compatible_p (tree x, tree y)

{

  return TYPE_MAIN_VARIANT (x) == TYPE_MAIN_VARIANT (y);

}

/* lang_hooks.tree_dump.dump_tree:  Dump language-specific parts of tree

   nodes.  Returns nonzero if it does not want the usual dumping of the

   second argument.  */

bool

lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED, tree t ATTRIBUTE_UNUSED)

{

  return false;

}

/* lang_hooks.tree_dump.type_qual:  Determine type qualifiers in a

   language-specific way.  */

int

lhd_tree_dump_type_quals (const_tree t)

{

  return TYPE_QUALS (t);

}

/* lang_hooks.gimplify_expr re-writes *EXPR_P into GIMPLE form.  */

int

lhd_gimplify_expr (tree *expr_p ATTRIBUTE_UNUSED,

                   gimple_seq *pre_p ATTRIBUTE_UNUSED,

                   gimple_seq *post_p ATTRIBUTE_UNUSED)

{

  return GS_UNHANDLED;

}

/* lang_hooks.tree_size: Determine the size of a tree with code C,

   which is a language-specific tree code in category tcc_constant or

   tcc_exceptional.  The default expects never to be called.  */

size_t

lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED)

{

  gcc_unreachable ();

}

/* Return true if decl, which is a function decl, may be called by a

   sibcall.  */

bool

lhd_decl_ok_for_sibcall (const_tree decl ATTRIBUTE_UNUSED)

{

  return true;

}

/* lang_hooks.decls.final_write_globals: perform final processing on

   global variables.  */

void

write_global_declarations (void)

{

  tree globals, decl, *vec;

  int len, i;

  /* This lang hook is dual-purposed, and also finalizes the

     compilation unit.  */

  cgraph_finalize_compilation_unit ();

  /* Really define vars that have had only a tentative definition.

     Really output inline functions that must actually be callable

     and have not been output so far.  */

  globals = lang_hooks.decls.getdecls ();

  len = list_length (globals);

  vec = XNEWVEC (tree, len);

  /* Process the decls in reverse order--earliest first.

     Put them into VEC from back to front, then take out from front.  */

  for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))

    vec[len - i - 1] = decl;

  wrapup_global_declarations (vec, len);

  check_global_declarations (vec, len);

  emit_debug_global_declarations (vec, len);

  /* Clean up.  */

  free (vec);

}

/* Called to perform language-specific initialization of CTX.  */

void

lhd_initialize_diagnostics (struct diagnostic_context *ctx ATTRIBUTE_UNUSED)

{

}

/* The default function to print out name of current function that caused

   an error.  */

void

lhd_print_error_function (diagnostic_context *context, const char *file,

                          diagnostic_info *diagnostic)

{

  if (diagnostic_last_function_changed (context, diagnostic))

    {

      const char *old_prefix = context->printer->prefix;

      tree abstract_origin = diagnostic->abstract_origin;

      char *new_prefix = (file && abstract_origin == NULL)

                         ? file_name_as_prefix (file) : NULL;

      pp_set_prefix (context->printer, new_prefix);

      if (current_function_decl == NULL)

        pp_printf (context->printer, _("At top level:"));

      else

        {

          tree fndecl, ao;

          if (abstract_origin)

            {

              ao = BLOCK_ABSTRACT_ORIGIN (abstract_origin);

              while (TREE_CODE (ao) == BLOCK

                     && BLOCK_ABSTRACT_ORIGIN (ao)

                     && BLOCK_ABSTRACT_ORIGIN (ao) != ao)

                ao = BLOCK_ABSTRACT_ORIGIN (ao);

              gcc_assert (TREE_CODE (ao) == FUNCTION_DECL);

              fndecl = ao;

            }

          else

            fndecl = current_function_decl;

          if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE)

            pp_printf

              (context->printer, _("In member function %qs"),

               identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));

          else

            pp_printf

              (context->printer, _("In function %qs"),

               identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));

          while (abstract_origin)

            {

              location_t *locus;

              tree block = abstract_origin;

              locus = &BLOCK_SOURCE_LOCATION (block);

              fndecl = NULL;

              block = BLOCK_SUPERCONTEXT (block);

              while (block && TREE_CODE (block) == BLOCK

                     && BLOCK_ABSTRACT_ORIGIN (block))

                {

                  ao = BLOCK_ABSTRACT_ORIGIN (block);

                  while (TREE_CODE (ao) == BLOCK

                         && BLOCK_ABSTRACT_ORIGIN (ao)

                         && BLOCK_ABSTRACT_ORIGIN (ao) != ao)

                    ao = BLOCK_ABSTRACT_ORIGIN (ao);

                  if (TREE_CODE (ao) == FUNCTION_DECL)

                    {

                      fndecl = ao;

                      break;

                    }

                  else if (TREE_CODE (ao) != BLOCK)

                    break;

                  block = BLOCK_SUPERCONTEXT (block);

                }

              if (fndecl)

                abstract_origin = block;

              else

                {

                  while (block && TREE_CODE (block) == BLOCK)

                    block = BLOCK_SUPERCONTEXT (block);

                  if (block && TREE_CODE (block) == FUNCTION_DECL)

                    fndecl = block;

                  abstract_origin = NULL;

                }

              if (fndecl)

                {

                  expanded_location s = expand_location (*locus);

                  pp_character (context->printer, ',');

                  pp_newline (context->printer);

                  if (s.file != NULL)

                    {

                      if (flag_show_column)

                        pp_printf (context->printer,

                                   _("    inlined from %qs at %s:%d:%d"),

                                   identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)),

                                   s.file, s.line, s.column);

                      else

                        pp_printf (context->printer,

                                   _("    inlined from %qs at %s:%d"),

                                   identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)),

                                   s.file, s.line);

                    }

                  else

                    pp_printf (context->printer, _("    inlined from %qs"),

                               identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 2)));

                }

            }

          pp_character (context->printer, ':');

        }

      diagnostic_set_last_function (context, diagnostic);

      pp_flush (context->printer);

      context->printer->prefix = old_prefix;

      free ((char*) new_prefix);

    }

}

tree

lhd_callgraph_analyze_expr (tree *tp ATTRIBUTE_UNUSED,

                            int *walk_subtrees ATTRIBUTE_UNUSED)

{

  return NULL;

}

tree

lhd_make_node (enum tree_code code)

{

  return make_node (code);

}

HOST_WIDE_INT

lhd_to_target_charset (HOST_WIDE_INT c)

{

  return c;

}

tree

lhd_expr_to_decl (tree expr, bool *tc ATTRIBUTE_UNUSED, bool *se ATTRIBUTE_UNUSED)

{

  return expr;

}

/* Return sharing kind if OpenMP sharing attribute of DECL is

   predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise.  */

enum omp_clause_default_kind

lhd_omp_predetermined_sharing (tree decl ATTRIBUTE_UNUSED)

{

  if (DECL_ARTIFICIAL (decl))

    return OMP_CLAUSE_DEFAULT_SHARED;

  return OMP_CLAUSE_DEFAULT_UNSPECIFIED;

}

/* Generate code to copy SRC to DST.  */

tree

lhd_omp_assignment (tree clause ATTRIBUTE_UNUSED, tree dst, tree src)

{

  return build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src);

}

/* Register language specific type size variables as potentially OpenMP

   firstprivate variables.  */

void

lhd_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *c ATTRIBUTE_UNUSED,

                                   tree t ATTRIBUTE_UNUSED)

{

}

/* Common function for add_builtin_function and

   add_builtin_function_ext_scope.  */

static tree

add_builtin_function_common (const char *name,

                             tree type,

                             int function_code,

                             enum built_in_class cl,

                             const char *library_name,

                             tree attrs,

                             tree (*hook) (tree))

{

  tree   id = get_identifier (name);

  tree decl = build_decl (BUILTINS_LOCATION, FUNCTION_DECL, id, type);

  TREE_PUBLIC (decl)         = 1;

  DECL_EXTERNAL (decl)       = 1;

  DECL_BUILT_IN_CLASS (decl) = cl;

  DECL_FUNCTION_CODE (decl)  = (enum built_in_function) function_code;

  /* DECL_FUNCTION_CODE is a bitfield; verify that the value fits.  */

  gcc_assert (DECL_FUNCTION_CODE (decl) == function_code);

  if (library_name)

    {

      tree libname = get_identifier (library_name);

      SET_DECL_ASSEMBLER_NAME (decl, libname);

    }

  /* Possibly apply some default attributes to this built-in function.  */

  if (attrs)

    decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);

  else

    decl_attributes (&decl, NULL_TREE, 0);

  return hook (decl);

}

/* Create a builtin function.  */

tree

add_builtin_function (const char *name,

                      tree type,

                      int function_code,

                      enum built_in_class cl,

                      const char *library_name,

                      tree attrs)

{

  return add_builtin_function_common (name, type, function_code, cl,

                                      library_name, attrs,

                                      lang_hooks.builtin_function);

}

/* Like add_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

add_builtin_function_ext_scope (const char *name,

                                tree type,

                                int function_code,

                                enum built_in_class cl,

                                const char *library_name,

                                tree attrs)

{

  return add_builtin_function_common (name, type, function_code, cl,

                                      library_name, attrs,

                                      lang_hooks.builtin_function_ext_scope);

}

tree

lhd_builtin_function (tree decl)

{

  lang_hooks.decls.pushdecl (decl);

  return decl;

}

/* LTO hooks.  */

/* Used to save and restore any previously active section.  */

static section *saved_section;

/* Begin a new LTO output section named NAME.  This default implementation

   saves the old section and emits assembly code to switch to the new

   section.  */

void

lhd_begin_section (const char *name)

{

  section *section;

  /* Save the old section so we can restore it in lto_end_asm_section.  */

  gcc_assert (!saved_section);

  saved_section = in_section;

  if (!saved_section)

    saved_section = text_section;

  /* Create a new section and switch to it.  */

  section = get_section (name, SECTION_DEBUG, NULL);

  switch_to_section (section);

}

/* Write DATA of length LEN to the current LTO output section.  This default

   implementation just calls assemble_string and frees BLOCK.  */

void

lhd_append_data (const void *data, size_t len, void *block)

{

  if (data)

    assemble_string ((const char *)data, len);

  free (block);

}

/* Finish the current LTO output section.  This default implementation emits

   assembly code to switch to any section previously saved by

   lhd_begin_section.  */

void

lhd_end_section (void)

{

  if (saved_section)

    {

      switch_to_section (saved_section);

      saved_section = NULL;

    }

}