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/* Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

   This file 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 of the License, or (at your option)

   any later version.

   This file 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 "cpplib.h"

#include "tree.h"

#include "c-family/c-common.h"

#include "c-family/c-pragma.h"

#include "tm_p.h"

#include "langhooks.h"

#include "target.h"

/* Keep the vector keywords handy for fast comparisons.  */

static GTY(()) tree __vector_keyword;

static GTY(()) tree vector_keyword;

static cpp_hashnode *

spu_categorize_keyword (const cpp_token *tok)

{

  if (tok->type == CPP_NAME)

    {

      cpp_hashnode *ident = tok->val.node.node;

      if (ident == C_CPP_HASHNODE (vector_keyword)

          || ident == C_CPP_HASHNODE (__vector_keyword))

        return C_CPP_HASHNODE (__vector_keyword);

      else

        return ident;

    }

  return 0;

}

/* Called to decide whether a conditional macro should be expanded.

   Since we have exactly one such macro (i.e, 'vector'), we do not

   need to examine the 'tok' parameter.  */

static cpp_hashnode *

spu_macro_to_expand (cpp_reader *pfile, const cpp_token *tok)

{

  cpp_hashnode *expand_this = tok->val.node.node;

  cpp_hashnode *ident;

  ident = spu_categorize_keyword (tok);

  if (ident == C_CPP_HASHNODE (__vector_keyword))

    {

      tok = cpp_peek_token (pfile, 0);

      ident = spu_categorize_keyword (tok);

      if (ident)

        {

          enum rid rid_code = (enum rid)(ident->rid_code);

          if (ident->type == NT_MACRO)

            {

              (void) cpp_get_token (pfile);

              tok = cpp_peek_token (pfile, 0);

              ident = spu_categorize_keyword (tok);

              if (ident)

                rid_code = (enum rid)(ident->rid_code);

            }

          if (rid_code == RID_UNSIGNED || rid_code == RID_LONG

              || rid_code == RID_SHORT || rid_code == RID_SIGNED

              || rid_code == RID_INT || rid_code == RID_CHAR

              || rid_code == RID_FLOAT || rid_code == RID_DOUBLE)

            expand_this = C_CPP_HASHNODE (__vector_keyword);

        }

    }

  return expand_this;

}

/* target hook for resolve_overloaded_builtin(). Returns a function call

   RTX if we can resolve the overloaded builtin */

tree

spu_resolve_overloaded_builtin (location_t loc, tree fndecl, void *passed_args)

{

#define SCALAR_TYPE_P(t) (INTEGRAL_TYPE_P (t) \

                          || SCALAR_FLOAT_TYPE_P (t) \

                          || POINTER_TYPE_P (t))

  VEC(tree,gc) *fnargs = (VEC(tree,gc) *) passed_args;

  unsigned int nargs = VEC_length (tree, fnargs);

  int new_fcode, fcode = DECL_FUNCTION_CODE (fndecl);

  struct spu_builtin_description *desc;

  tree match = NULL_TREE;

  /* The vector types are not available if the backend is not initialized.  */

  gcc_assert (!flag_preprocess_only);

  desc = &spu_builtins[fcode];

  if (desc->type != B_OVERLOAD)

    return NULL_TREE;

  /* Compare the signature of each internal builtin function with the

     function arguments until a match is found. */

  for (new_fcode = fcode + 1; spu_builtins[new_fcode].type == B_INTERNAL;

       new_fcode++)

    {

      tree decl = targetm.builtin_decl (new_fcode, true);

      tree params = TYPE_ARG_TYPES (TREE_TYPE (decl));

      tree param;

      bool all_scalar;

      unsigned int p;

      /* Check whether all parameters are scalar.  */

      all_scalar = true;

      for (param = params; param != void_list_node; param = TREE_CHAIN (param))

      if (!SCALAR_TYPE_P (TREE_VALUE (param)))

        all_scalar = false;

      for (param = params, p = 0;

           param != void_list_node;

           param = TREE_CHAIN (param), p++)

        {

          tree var, arg_type, param_type = TREE_VALUE (param);

          if (p >= nargs)

            {

              error ("insufficient arguments to overloaded function %s",

                     desc->name);

              return error_mark_node;

            }

          var = VEC_index (tree, fnargs, p);

          if (TREE_CODE (var) == NON_LVALUE_EXPR)

            var = TREE_OPERAND (var, 0);

          if (TREE_CODE (var) == ERROR_MARK)

            return NULL_TREE;   /* Let somebody else deal with the problem. */

          arg_type = TREE_TYPE (var);

          /* The intrinsics spec does not specify precisely how to

             resolve generic intrinsics.  We require an exact match

             for vector types and let C do it's usual parameter type

             checking/promotions for scalar arguments, except for the

             first argument of intrinsics which don't have a vector

             parameter. */

          if ((!SCALAR_TYPE_P (param_type)

               || !SCALAR_TYPE_P (arg_type)

               || (all_scalar && p == 0))

              && !lang_hooks.types_compatible_p (param_type, arg_type))

            break;

        }

      if (param == void_list_node)

        {

          if (p != nargs)

            {

              error ("too many arguments to overloaded function %s",

                     desc->name);

              return error_mark_node;

            }

          match = decl;

          break;

        }

    }

  if (match == NULL_TREE)

    {

      error ("parameter list does not match a valid signature for %s()",

             desc->name);

      return error_mark_node;

    }

  return build_function_call_vec (loc, match, fnargs, NULL);

#undef SCALAR_TYPE_P

}

void

spu_cpu_cpp_builtins (struct cpp_reader *pfile)

{

  cpp_define (pfile, "__SPU__");

  cpp_assert (pfile, "cpu=spu");

  cpp_assert (pfile, "machine=spu");

  if (spu_arch == PROCESSOR_CELLEDP)

    cpp_define (pfile, "__SPU_EDP__");

  cpp_define (pfile, "__vector=__attribute__((__spu_vector__))");

  switch (spu_ea_model)

    {

    case 32:

      cpp_define (pfile, "__EA32__");

      break;

    case 64:

      cpp_define (pfile, "__EA64__");

      break;

    default:

       gcc_unreachable ();

    }

  if (!flag_iso)

    {

      /* Define this when supporting context-sensitive keywords.  */

      cpp_define (pfile, "__VECTOR_KEYWORD_SUPPORTED__");

      cpp_define (pfile, "vector=vector");

      /* Initialize vector keywords.  */

      __vector_keyword = get_identifier ("__vector");

      C_CPP_HASHNODE (__vector_keyword)->flags |= NODE_CONDITIONAL;

      vector_keyword = get_identifier ("vector");

      C_CPP_HASHNODE (vector_keyword)->flags |= NODE_CONDITIONAL;

      /* Enable context-sensitive macros.  */

      cpp_get_callbacks (pfile)->macro_to_expand = spu_macro_to_expand;

    }

}

void

spu_c_common_override_options (void)

{

  if (!TARGET_STD_MAIN)

    {

      /* Don't give warnings about the main() function.  */

      warn_main = 0;

    }

}