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/* Some code common to C and ObjC front ends.

   Copyright (C) 2001, 2002, 2003, 2004, 2005, 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/>.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "tree.h"

#include "rtl.h"

#include "insn-config.h"

#include "integrate.h"

#include "c-tree.h"

#include "c-pretty-print.h"

#include "function.h"

#include "flags.h"

#include "toplev.h"

#include "diagnostic.h"

#include "tree-inline.h"

#include "varray.h"

#include "ggc.h"

#include "langhooks.h"

#include "tree-mudflap.h"

#include "target.h"

#include "c-objc-common.h"

static bool c_tree_printer (pretty_printer *, text_info *, const char *,

                            int, bool, bool, bool);

bool

c_missing_noreturn_ok_p (tree decl)

{

  /* A missing noreturn is not ok for freestanding implementations and

     ok for the `main' function in hosted implementations.  */

  return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl));

}

/* We want to inline `extern inline' functions even if this would

   violate inlining limits.  Some glibc and linux constructs depend on

   such functions always being inlined when optimizing.  */

int

c_disregard_inline_limits (tree fn)

{

  if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL)

    return 1;

  return (!flag_really_no_inline && DECL_DECLARED_INLINE_P (fn)

          && DECL_EXTERNAL (fn));

}

int

c_cannot_inline_tree_fn (tree *fnp)

{

  tree fn = *fnp;

  bool do_warning = (warn_inline

                     && DECL_INLINE (fn)

                     && DECL_DECLARED_INLINE_P (fn)

                     && !DECL_IN_SYSTEM_HEADER (fn));

  if (flag_really_no_inline

      && lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) == NULL)

    {

      if (do_warning)

        warning (OPT_Winline, "function %q+F can never be inlined because it "

                 "is suppressed using -fno-inline", fn);

      goto cannot_inline;

    }

  /* Don't auto-inline anything that might not be bound within

     this unit of translation.  */

  if (!DECL_DECLARED_INLINE_P (fn) && !targetm.binds_local_p (fn))

    {

      if (do_warning)

        warning (OPT_Winline, "function %q+F can never be inlined because it "

                 "might not be bound within this unit of translation", fn);

      goto cannot_inline;

    }

  if (!function_attribute_inlinable_p (fn))

    {

      if (do_warning)

        warning (OPT_Winline, "function %q+F can never be inlined because it "

                 "uses attributes conflicting with inlining", fn);

      goto cannot_inline;

    }

  return 0;

 cannot_inline:

  DECL_UNINLINABLE (fn) = 1;

  return 1;

}

/* Called from check_global_declarations.  */

bool

c_warn_unused_global_decl (tree decl)

{

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

    return false;

  if (DECL_IN_SYSTEM_HEADER (decl))

    return false;

  return true;

}

/* Initialization common to C and Objective-C front ends.  */

bool

c_objc_common_init (void)

{

  c_init_decl_processing ();

  if (c_common_init () == false)

    return false;

  /* These were not defined in the Objective-C front end, but I'm

     putting them here anyway.  The diagnostic format decoder might

     want an enhanced ObjC implementation.  */

  diagnostic_format_decoder (global_dc) = &c_tree_printer;

  /* If still unspecified, make it match -std=c99

     (allowing for -pedantic-errors).  */

  if (mesg_implicit_function_declaration < 0)

    {

      if (flag_isoc99)

        mesg_implicit_function_declaration = flag_pedantic_errors ? 2 : 1;

      else

        mesg_implicit_function_declaration = 0;

    }

  return true;

}

/* Called during diagnostic message formatting process to print a

   source-level entity onto BUFFER.  The meaning of the format specifiers

   is as follows:

   %D: a general decl,

   %E: an identifier or expression,

   %F: a function declaration,

   %T: a type.

   These format specifiers form a subset of the format specifiers set used

   by the C++ front-end.

   Please notice when called, the `%' part was already skipped by the

   diagnostic machinery.  */

static bool

c_tree_printer (pretty_printer *pp, text_info *text, const char *spec,

                int precision, bool wide, bool set_locus, bool hash)

{

  tree t = va_arg (*text->args_ptr, tree);

  tree name;

  const char *n = "({anonymous})";

  c_pretty_printer *cpp = (c_pretty_printer *) pp;

  pp->padding = pp_none;

  if (precision != 0 || wide || hash)

    return false;

  if (set_locus && text->locus)

    *text->locus = DECL_SOURCE_LOCATION (t);

  switch (*spec)

    {

    case 'D':

      if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))

        {

          t = DECL_DEBUG_EXPR (t);

          if (!DECL_P (t))

            {

              pp_c_expression (cpp, t);

              return true;

            }

        }

      /* FALLTHRU */

    case 'F':

      if (DECL_NAME (t))

        n = lang_hooks.decl_printable_name (t, 2);

      break;

    case 'T':

      gcc_assert (TYPE_P (t));

      name = TYPE_NAME (t);

      if (name && TREE_CODE (name) == TYPE_DECL)

        {

          if (DECL_NAME (name))

            pp_string (cpp, lang_hooks.decl_printable_name (name, 2));

          else

            pp_type_id (cpp, t);

          return true;

        }

      else

        {

          pp_type_id (cpp, t);

          return true;

        }

      break;

    case 'E':

      if (TREE_CODE (t) == IDENTIFIER_NODE)

        n = IDENTIFIER_POINTER (t);

      else

        {

          pp_expression (cpp, t);

          return true;

        }

      break;

    default:

      return false;

    }

  pp_string (cpp, n);

  return true;

}

/* In C and ObjC, all decls have "C" linkage.  */

bool

has_c_linkage (tree decl ATTRIBUTE_UNUSED)

{

  return true;

}

void

c_initialize_diagnostics (diagnostic_context *context)

{

  pretty_printer *base = context->printer;

  c_pretty_printer *pp = XNEW (c_pretty_printer);

  memcpy (pp_base (pp), base, sizeof (pretty_printer));

  pp_c_pretty_printer_init (pp);

  context->printer = (pretty_printer *) pp;

  /* It is safe to free this object because it was previously XNEW()'d.  */

  XDELETE (base);

}

int

c_types_compatible_p (tree x, tree y)

{

    return comptypes (TYPE_MAIN_VARIANT (x), TYPE_MAIN_VARIANT (y));

}

/* Determine if the type is a vla type for the backend.  */

bool

c_vla_unspec_p (tree x, tree fn ATTRIBUTE_UNUSED)

{

  return c_vla_type_p (x);

}