/* Subroutines used for macro/preprocessor support on the ia-32.
   Copyright (C) 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
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 "rtl.h"
#include "tree.h"
#include "tm_p.h"
#include "flags.h"
#include "c-common.h"
#include "ggc.h"
#include "target.h"
#include "target-def.h"
#include "cpplib.h"
#include "c-pragma.h"

static bool ix86_pragma_option_parse (tree);
static void ix86_target_macros_internal
  (int, enum processor_type, enum processor_type, enum fpmath_unit,
   void (*def_or_undef) (cpp_reader *, const char *));


/* Internal function to either define or undef the appropriate system
   macros.  */
static void
ix86_target_macros_internal (int isa_flag,
			     enum processor_type arch,
			     enum processor_type tune,
			     enum fpmath_unit fpmath,
			     void (*def_or_undef) (cpp_reader *,
						   const char *))
{
  /* For some of the k6/pentium varients there weren't seperate ISA bits to
     identify which tune/arch flag was passed, so figure it out here.  */
  size_t arch_len = strlen (ix86_arch_string);
  size_t tune_len = strlen (ix86_tune_string);
  int last_arch_char = ix86_arch_string[arch_len - 1];
  int last_tune_char = ix86_tune_string[tune_len - 1];

  /* Built-ins based on -march=.  */
  switch (arch)
    {
    case PROCESSOR_I386:
      break;
    case PROCESSOR_I486:
      def_or_undef (parse_in, "__i486");
      def_or_undef (parse_in, "__i486__");
      break;
    case PROCESSOR_PENTIUM:
      def_or_undef (parse_in, "__i586");
      def_or_undef (parse_in, "__i586__");
      def_or_undef (parse_in, "__pentium");
      def_or_undef (parse_in, "__pentium__");
      if (isa_flag & OPTION_MASK_ISA_MMX)
	def_or_undef (parse_in, "__pentium_mmx__");
      break;
    case PROCESSOR_PENTIUMPRO:
      def_or_undef (parse_in, "__i686");
      def_or_undef (parse_in, "__i686__");
      def_or_undef (parse_in, "__pentiumpro");
      def_or_undef (parse_in, "__pentiumpro__");
      break;
    case PROCESSOR_GEODE:
      def_or_undef (parse_in, "__geode");
      def_or_undef (parse_in, "__geode__");
      break;
    case PROCESSOR_K6:
      def_or_undef (parse_in, "__k6");
      def_or_undef (parse_in, "__k6__");
      if (last_arch_char == '2')
	def_or_undef (parse_in, "__k6_2__");
      else if (last_arch_char == '3')
	def_or_undef (parse_in, "__k6_3__");
      else if (isa_flag & OPTION_MASK_ISA_3DNOW)
	def_or_undef (parse_in, "__k6_3__");
      break;
    case PROCESSOR_ATHLON:
      def_or_undef (parse_in, "__athlon");
      def_or_undef (parse_in, "__athlon__");
      if (isa_flag & OPTION_MASK_ISA_SSE)
	def_or_undef (parse_in, "__athlon_sse__");
      break;
    case PROCESSOR_K8:
      def_or_undef (parse_in, "__k8");
      def_or_undef (parse_in, "__k8__");
      break;
    case PROCESSOR_AMDFAM10:
      def_or_undef (parse_in, "__amdfam10");
      def_or_undef (parse_in, "__amdfam10__");
      break;
    case PROCESSOR_PENTIUM4:
      def_or_undef (parse_in, "__pentium4");
      def_or_undef (parse_in, "__pentium4__");
      break;
    case PROCESSOR_NOCONA:
      def_or_undef (parse_in, "__nocona");
      def_or_undef (parse_in, "__nocona__");
      break;
    case PROCESSOR_CORE2:
      def_or_undef (parse_in, "__core2");
      def_or_undef (parse_in, "__core2__");
      break;
    /* use PROCESSOR_max to not set/unset the arch macro.  */
    case PROCESSOR_max:
      break;
    case PROCESSOR_GENERIC32:
    case PROCESSOR_GENERIC64:
      gcc_unreachable ();
    }

  /* Built-ins based on -mtune=.  */
  switch (tune)
    {
    case PROCESSOR_I386:
      def_or_undef (parse_in, "__tune_i386__");
      break;
    case PROCESSOR_I486:
      def_or_undef (parse_in, "__tune_i486__");
      break;
    case PROCESSOR_PENTIUM:
      def_or_undef (parse_in, "__tune_i586__");
      def_or_undef (parse_in, "__tune_pentium__");
      if (last_tune_char == 'x')
	def_or_undef (parse_in, "__tune_pentium_mmx__");
      break;
    case PROCESSOR_PENTIUMPRO:
      def_or_undef (parse_in, "__tune_i686__");
      def_or_undef (parse_in, "__tune_pentiumpro__");
      switch (last_tune_char)
	{
	case '3':
	  def_or_undef (parse_in, "__tune_pentium3__");
	  /* FALLTHRU */
	case '2':
	  def_or_undef (parse_in, "__tune_pentium2__");
	  break;
	}
      break;
    case PROCESSOR_GEODE:
      def_or_undef (parse_in, "__tune_geode__");
      break;
    case PROCESSOR_K6:
      def_or_undef (parse_in, "__tune_k6__");
      if (last_tune_char == '2')
	def_or_undef (parse_in, "__tune_k6_2__");
      else if (last_tune_char == '3')
	def_or_undef (parse_in, "__tune_k6_3__");
      else if (isa_flag & OPTION_MASK_ISA_3DNOW)
	def_or_undef (parse_in, "__tune_k6_3__");
      break;
    case PROCESSOR_ATHLON:
      def_or_undef (parse_in, "__tune_athlon__");
      if (isa_flag & OPTION_MASK_ISA_SSE)
	def_or_undef (parse_in, "__tune_athlon_sse__");
      break;
    case PROCESSOR_K8:
      def_or_undef (parse_in, "__tune_k8__");
      break;
    case PROCESSOR_AMDFAM10:
      def_or_undef (parse_in, "__tune_amdfam10__");
      break;
    case PROCESSOR_PENTIUM4:
      def_or_undef (parse_in, "__tune_pentium4__");
      break;
    case PROCESSOR_NOCONA:
      def_or_undef (parse_in, "__tune_nocona__");
      break;
    case PROCESSOR_CORE2:
      def_or_undef (parse_in, "__tune_core2__");
      break;
    case PROCESSOR_GENERIC32:
    case PROCESSOR_GENERIC64:
      break;
    /* use PROCESSOR_max to not set/unset the tune macro.  */
    case PROCESSOR_max:
      break;
    }

  if (isa_flag & OPTION_MASK_ISA_MMX)
    def_or_undef (parse_in, "__MMX__");
  if (isa_flag & OPTION_MASK_ISA_3DNOW)
    def_or_undef (parse_in, "__3dNOW__");
  if (isa_flag & OPTION_MASK_ISA_3DNOW_A)
    def_or_undef (parse_in, "__3dNOW_A__");
  if (isa_flag & OPTION_MASK_ISA_SSE)
    def_or_undef (parse_in, "__SSE__");
  if (isa_flag & OPTION_MASK_ISA_SSE2)
    def_or_undef (parse_in, "__SSE2__");
  if (isa_flag & OPTION_MASK_ISA_SSE3)
    def_or_undef (parse_in, "__SSE3__");
  if (isa_flag & OPTION_MASK_ISA_SSSE3)
    def_or_undef (parse_in, "__SSSE3__");
  if (isa_flag & OPTION_MASK_ISA_SSE4_1)
    def_or_undef (parse_in, "__SSE4_1__");
  if (isa_flag & OPTION_MASK_ISA_SSE4_2)
    def_or_undef (parse_in, "__SSE4_2__");
  if (isa_flag & OPTION_MASK_ISA_AES)
    def_or_undef (parse_in, "__AES__");
  if (isa_flag & OPTION_MASK_ISA_PCLMUL)
    def_or_undef (parse_in, "__PCLMUL__");
  if (isa_flag & OPTION_MASK_ISA_SSE4A)
    def_or_undef (parse_in, "__SSE4A__");
  if (isa_flag & OPTION_MASK_ISA_SSE5)
    def_or_undef (parse_in, "__SSE5__");
  if ((fpmath & FPMATH_SSE) && (isa_flag & OPTION_MASK_ISA_SSE))
    def_or_undef (parse_in, "__SSE_MATH__");
  if ((fpmath & FPMATH_SSE) && (isa_flag & OPTION_MASK_ISA_SSE2))
    def_or_undef (parse_in, "__SSE2_MATH__");
}


/* Hook to validate the current #pragma option and set the state, and update
   the macros based on what was changed.  */

static bool
ix86_pragma_option_parse (tree args)
{
  tree prev_tree = build_target_option_node ();
  tree cur_tree;
  struct cl_target_option *prev_opt;
  struct cl_target_option *cur_opt;
  int prev_isa;
  int cur_isa;
  int diff_isa;
  enum processor_type prev_arch;
  enum processor_type prev_tune;
  enum processor_type cur_arch;
  enum processor_type cur_tune;

  if (! args)
    {
      cur_tree = target_option_default_node;
      cl_target_option_restore (TREE_TARGET_OPTION (cur_tree));
    }
  else
    {
      cur_tree = ix86_valid_option_attribute_tree (args);
      if (!cur_tree)
	return false;
    }

  target_option_current_node = cur_tree;

  /* Figure out the previous/current isa, arch, tune and the differences.  */
  prev_opt  = TREE_TARGET_OPTION (prev_tree);
  cur_opt   = TREE_TARGET_OPTION (cur_tree);
  prev_isa  = prev_opt->ix86_isa_flags;
  cur_isa   = cur_opt->ix86_isa_flags;
  diff_isa  = (prev_isa ^ cur_isa);
  prev_arch = prev_opt->arch;
  prev_tune = prev_opt->tune;
  cur_arch  = cur_opt->arch;
  cur_tune  = cur_opt->tune;

  /* If the same processor is used for both previous and current options, don't
     change the macros.  */
  if (cur_arch == prev_arch)
    cur_arch = prev_arch = PROCESSOR_max;

  if (cur_tune == prev_tune)
    cur_tune = prev_tune = PROCESSOR_max;

  /* Undef all of the macros for that are no longer current.  */
  ix86_target_macros_internal (prev_isa & diff_isa,
			       prev_arch,
			       prev_tune,
			       prev_opt->fpmath,
			       cpp_undef);

  /* Define all of the macros for new options that were just turned on.  */
  ix86_target_macros_internal (cur_isa & diff_isa,
			       cur_arch,
			       cur_tune,
			       cur_opt->fpmath,
			       cpp_define);

  return true;
}

/* Function to tell the preprocessor about the defines for the current target.  */

void
ix86_target_macros (void)
{
  /* 32/64-bit won't change with target specific options, so do the assert and
     builtin_define_std calls here.  */
  if (TARGET_64BIT)
    {
      cpp_assert (parse_in, "cpu=x86_64");
      cpp_assert (parse_in, "machine=x86_64");
      cpp_define (parse_in, "__amd64");
      cpp_define (parse_in, "__amd64__");
      cpp_define (parse_in, "__x86_64");
      cpp_define (parse_in, "__x86_64__");
    }
  else
    {
      cpp_assert (parse_in, "cpu=i386");
      cpp_assert (parse_in, "machine=i386");
      builtin_define_std ("i386");
    }

  ix86_target_macros_internal (ix86_isa_flags,
			       ix86_arch,
			       ix86_tune,
			       ix86_fpmath,
			       cpp_define);
}


/* Register target pragmas.  We need to add the hook for parsing #pragma GCC
   option here rather than in i386.c since it will pull in various preprocessor
   functions, and those are not present in languages like fortran without a
   preprocessor.  */

void
ix86_register_pragmas (void)
{
  /* Update pragma hook to allow parsing #pragma GCC option.  */
  targetm.target_option.pragma_parse = ix86_pragma_option_parse;

#ifdef REGISTER_SUBTARGET_PRAGMAS
  REGISTER_SUBTARGET_PRAGMAS ();
#endif
}
