iCE40/nextpnr - [no description]

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/* GCC back-end for ortho
  Copyright (C) 2002-1014 Tristan Gingold and al.

  GHDL 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 2, or (at your option) any later
  version.

  GHDL 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 COPYING.  If not, write to the Free
  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "hash-set.h"
#include "machmode.h"
#include "vec.h"
#include "double-int.h"
#include "input.h"
#include "alias.h"
#include "symtab.h"
#include "wide-int.h"
#include "inchash.h"
#include "real.h"
#include "tree.h"

#include "bitmap.h"
#include "hash-map.h"
#include "is-a.h"
#include "plugin-api.h"
#include "hard-reg-set.h"
#include "input.h"
#include "function.h"
#include "ipa-ref.h"
#include "cgraph.h"

#include "fold-const.h"

#include <stddef.h>
#include <math.h>

#include "tm_p.h"
#include "defaults.h"
#include "ggc.h"
#include "diagnostic.h"
#include "langhooks.h"
#include "langhooks-def.h"
#include "toplev.h"
#include "opts.h"
#include "options.h"
#include "tree-iterator.h"
#include "target.h"
#include "convert.h"
#include "tree-pass.h"
#include "tree-dump.h"

#include "print-tree.h"
#include "stringpool.h"
#include "stor-layout.h"
#include "varasm.h"

/* Returns the number of FIELD_DECLs in TYPE.
   Copied here from expr.c in gcc4.9 as it is no longer exported by tree.h.  */

static int
fields_length (const_tree type)
{
  tree t = TYPE_FIELDS (type);
  int count = 0;

  for (; t; t = DECL_CHAIN (t))
    if (TREE_CODE (t) == FIELD_DECL)
      ++count;

  return count;
}

/* TODO:
 * remove stmt_list_stack, save in if/case/loop block
 * Re-add -v (if necessary)
 */

static tree type_for_size (unsigned int precision, int unsignedp);

const int tree_identifier_size = sizeof (struct tree_identifier);

struct GTY(()) binding_level
{
  /*  The BIND_EXPR node for this binding.  */
  tree bind;

  /*  The BLOCK node for this binding.  */
  tree block;

  /*  If true, stack must be saved (alloca is used).  */
  int save_stack;

  /*  Parent binding level.  */
  struct binding_level *prev;

  /*  Decls in this binding.  */
  tree first_decl;
  tree last_decl;

  /*  Blocks in this binding.  */
  tree first_block;
  tree last_block;

  /* Statements list containing the binding. */
  tree prev_stmts;
};

/*  The current binding level.  */
static GTY(()) struct binding_level *cur_binding_level = NULL;

/*  Chain of unused binding levels.  */
static GTY(()) struct binding_level *old_binding_levels = NULL;

/*  Chain of statements currently generated.  */
static GTY(()) tree cur_stmts = NULL_TREE;

enum binding_kind { GLOBAL_BINDING, FUNCTION_BINDING, LOCAL_BINDING };

static void
push_binding (enum binding_kind kind)
{
  struct binding_level *res;

  /* Get a binding level (old ones are recycled).  */
  if (old_binding_levels == NULL)
    res = ggc_alloc<binding_level> ();
  else
    {
      res = old_binding_levels;
      old_binding_levels = res->prev;
    }

  /* Init.  */
  res->first_decl = NULL_TREE;
  res->last_decl = NULL_TREE;

  res->first_block = NULL_TREE;
  res->last_block = NULL_TREE;

  res->save_stack = 0;

  switch (kind)
    {
    case GLOBAL_BINDING:
      res->bind = NULL_TREE;
      res->block = NULL_TREE;
      res->prev = NULL;
      res->prev_stmts = NULL;
      break;
    case FUNCTION_BINDING:
    case LOCAL_BINDING:
      res->block = make_node (BLOCK);
      TREE_USED (res->block) = true;
      res->bind = build3 (BIND_EXPR, void_type_node,
			  NULL_TREE, NULL_TREE, res->block);
      TREE_SIDE_EFFECTS (res->bind) = true;
      res->prev_stmts = cur_stmts;
      cur_stmts = alloc_stmt_list ();
      break;
    }

  switch (kind)
    {
    case GLOBAL_BINDING:
      /* No supercontext for the global binding.  */
      break;
    case FUNCTION_BINDING:
      /* No containing block.  */
      BLOCK_SUPERCONTEXT (res->block) = current_function_decl;
      break;
    case LOCAL_BINDING:
      /* Append the block created.  */
      if (cur_binding_level->first_block == NULL)
	cur_binding_level->first_block = res->block;
      else
	BLOCK_CHAIN (cur_binding_level->last_block) = res->block;
      cur_binding_level->last_block = res->block;

      BLOCK_SUPERCONTEXT (res->block) = cur_binding_level->block;
      break;
    }

  /* Chain previous binding, set current binding.  */
  res->prev = cur_binding_level;
  cur_binding_level = res;
}

static tree
pushdecl (tree decl)
{
  /* Set context (always a function or NULL if top-level).  */
  DECL_CONTEXT (decl) = current_function_decl;

  /* Chain the declaration.  */
  if (cur_binding_level->first_decl == NULL)
    cur_binding_level->first_decl = decl;
  else
    TREE_CHAIN (cur_binding_level->last_decl) = decl;
  cur_binding_level->last_decl = decl;

  return decl;
}

static tree
pop_binding (void)
{
  tree res;
  struct binding_level *cur;

  cur = cur_binding_level;
  res = cur->bind;

  if (cur->save_stack)
    {
      tree tmp_var;
      tree save;
      tree save_call;
      tree restore;
      tree t;

      /* Create an artificial var to save the stack pointer.  */
      tmp_var = build_decl (input_location, VAR_DECL, NULL, ptr_type_node);
      DECL_ARTIFICIAL (tmp_var) = true;
      DECL_IGNORED_P (tmp_var) = true;
      TREE_USED (tmp_var) = true;
      pushdecl (tmp_var);

      /* Create the save stmt.  */
      save_call = build_call_expr
	(builtin_decl_implicit (BUILT_IN_STACK_SAVE), 0);
      save = build2 (MODIFY_EXPR, ptr_type_node, tmp_var, save_call);
      TREE_SIDE_EFFECTS (save) = true;

      /* Create the restore stmt.  */
      restore = build_call_expr
	(builtin_decl_implicit (BUILT_IN_STACK_RESTORE), 1, tmp_var);

      /* Build a try-finally block.
	 The statement list is the block of current statements.  */
      t = build2 (TRY_FINALLY_EXPR, void_type_node, cur_stmts, NULL_TREE);
      TREE_SIDE_EFFECTS (t) = true;

      /* The finally block is the restore stmt.  */
      append_to_statement_list (restore, &TREE_OPERAND (t, 1));

      /* The body of the BIND_BLOCK is the save stmt, followed by the
	 try block.  */
      BIND_EXPR_BODY (res) = NULL_TREE;
      append_to_statement_list (save, &BIND_EXPR_BODY (res));
      append_to_statement_list (t, &BIND_EXPR_BODY (res));
    }
  else
    {
      /* The body of the BIND_BLOCK is the statement block.  */
      BIND_EXPR_BODY (res) = cur_stmts;
    }
  BIND_EXPR_VARS (res) = cur->first_decl;

  BLOCK_SUBBLOCKS (cur->block) = cur->first_block;
  BLOCK_VARS (cur->block) = cur->first_decl;

  /* Set current statements list and current binding.  */
  cur_stmts = cur->prev_stmts;
  cur_binding_level = cur->prev;

  /* Put removed binding to the recycle list.  */
  cur->prev = old_binding_levels;
  old_binding_levels = cur;

  return res;
}

static void
append_stmt (tree stmt)
{
  /* Set location (if not done).  */
  if (!EXPR_HAS_LOCATION (stmt))
    SET_EXPR_LOCATION (stmt, input_location);

  TREE_SIDE_EFFECTS (stmt) = true;
  append_to_statement_list (stmt, &cur_stmts);
}

static GTY(()) tree stack_alloc_function_ptr;

static bool
global_bindings_p (void)
{
  return cur_binding_level->prev == NULL;
}

/* 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.  */
static void
define_builtin (const char *name,
		tree type,
		enum built_in_function code,
		const char *library_name,
		int attr)
{
  tree decl;

  decl = add_builtin_function (name, type, code, BUILT_IN_NORMAL,
			       library_name, NULL_TREE);
  set_call_expr_flags (decl, attr);

  set_builtin_decl (code, decl, true);
}

static REAL_VALUE_TYPE fp_const_m_p5; /* -0.5 */

static bool
ortho_init (void)
{
  tree n;

  input_location = BUILTINS_LOCATION;

  /* Create a global binding.  Don't use push_binding, as neither a BLOCK nor
     a BIND_EXPR are needed.  */
  push_binding (GLOBAL_BINDING);

  build_common_tree_nodes (0, 0);

  n = build_decl (input_location,
                  TYPE_DECL, get_identifier ("int"), integer_type_node);
  pushdecl (n);
  n = build_decl (input_location,
                  TYPE_DECL, get_identifier ("char"), char_type_node);
  pushdecl (n);

  /* Create alloca builtin.  */
  {
    tree args_type = tree_cons (NULL_TREE, size_type_node, void_list_node);
    tree func_type = build_function_type (ptr_type_node, args_type);

    define_builtin ("__builtin_alloca", func_type,
		    BUILT_IN_ALLOCA, NULL, 0);

    stack_alloc_function_ptr = build1
      (ADDR_EXPR,
       build_pointer_type (func_type),
       builtin_decl_implicit (BUILT_IN_ALLOCA));
  }

  {
    tree ptr_ftype = build_function_type (ptr_type_node, NULL_TREE);

    define_builtin ("__builtin_stack_save", ptr_ftype,
		    BUILT_IN_STACK_SAVE, NULL, 0);
  }

  {
    tree ftype_ptr = build_function_type_list (void_type_node,
					       ptr_type_node, NULL_TREE);

    define_builtin ("__builtin_stack_restore", ftype_ptr,
		    BUILT_IN_STACK_RESTORE, NULL, 0);
  }

  {
    tree ftype_ptr = build_function_type_list (void_type_node, NULL_TREE);

    define_builtin ("__builtin_trap", ftype_ptr,
		    BUILT_IN_TRAP, NULL, ECF_NOTHROW | ECF_LEAF);
    TREE_THIS_VOLATILE (builtin_decl_explicit (BUILT_IN_TRAP)) = 1;
  }

  fp_const_m_p5 = real_value_negate (&dconsthalf);

  build_common_builtin_nodes ();
  // FIXME: this MAY remove the need for creating the builtins above...
  // Evaluate tree.c / build_common_builtin_nodes (); for each in turn.

  return true;
}

static void
ortho_finish (void)
{
}

static unsigned int
ortho_option_lang_mask (void)
{
  return CL_vhdl;
}

static bool
ortho_post_options (const char **pfilename)
{
  if (*pfilename == NULL || strcmp (*pfilename, "-") == 0)
    *pfilename = "*stdin*";

  /* Default hook.  */
  lhd_post_options (pfilename);

  /* Run the back-end.  */
  return false;
}

extern "C" int lang_handle_option (const char *opt, const char *arg);

static bool
ortho_handle_option (size_t code, const char *arg,
		     int value ATTRIBUTE_UNUSED,
		     int kind ATTRIBUTE_UNUSED,
                     location_t loc ATTRIBUTE_UNUSED,
                     const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
{
  const char *opt;

  opt = cl_options[code].opt_text;

  switch (code)
    {
    case OPT__elab:
    case OPT_l:
    case OPT_c:
    case OPT__anaelab:
      /* Only a few options have a real arguments.  */
      return lang_handle_option (opt, arg) != 0;
    default:
      /* The other options must have a joint argument.  */
      if (arg != NULL)
	{
	  size_t len1;
	  size_t len2;
	  char *nopt;

	  len1 = strlen (opt);
	  len2 = strlen (arg);
	  nopt = (char *) alloca (len1 + len2 + 1);
	  memcpy (nopt, opt, len1);
	  memcpy (nopt + len1, arg, len2);
	  nopt[len1 + len2] = 0;
	  opt = nopt;
	}
      return lang_handle_option (opt, NULL) != 0;
    }
}

extern "C" int lang_parse_file (const char *filename);

static void
ortho_parse_file (void)
{
  const char *filename;
  const char *dbg_filename;

  if (num_in_fnames == 0)
    filename = NULL;
  else
    filename = in_fnames[0];

  /* Use absolute filenames for debug info.  Works better than relative
     filenames with some debuggers/tools.  */
  if (filename == NULL)
    dbg_filename = "*stdin*";
  else if (IS_ABSOLUTE_PATH (filename))
    dbg_filename = filename;
  else
    dbg_filename = concat (getpwd (), "/", filename, NULL);

  linemap_add (line_table, LC_ENTER, 0, dbg_filename, 1);
  input_location = linemap_line_start (line_table, 1, 252);

  if (!lang_parse_file (filename))
    errorcount++;
  linemap_add (line_table, LC_LEAVE, 0, NULL, 1);
}

/*  Called by the back-end or by the front-end when the address of EXP
    must be taken.
    This function should found the base object (if any), and mark it as
    addressable (via TREE_ADDRESSABLE).  It may emit a warning if this
    object cannot be addressable (front-end restriction).
    Returns TRUE in case of success, FALSE in case of failure.
    Note that the status is never checked by the back-end.  */
static bool
ortho_mark_addressable (tree exp)
{
  tree n;

  n = exp;

  while (1)
    switch (TREE_CODE (n))
      {
      case VAR_DECL:
      case CONST_DECL:
      case PARM_DECL:
      case RESULT_DECL:
	TREE_ADDRESSABLE (n) = true;
	return true;

      case COMPONENT_REF:
      case ARRAY_REF:
      case ARRAY_RANGE_REF:
	n = TREE_OPERAND (n, 0);
	break;

      case FUNCTION_DECL:
      case CONSTRUCTOR:
	TREE_ADDRESSABLE (n) = true;
	return true;

      case INDIRECT_REF:
	return true;

      default:
	gcc_unreachable ();
      }
}

static tree
ortho_truthvalue_conversion (tree expr)
{
  tree expr_type;
  tree t;
  tree f;

  expr_type = TREE_TYPE (expr);
  if (TREE_CODE (expr_type) != BOOLEAN_TYPE)
    {
      t = integer_one_node;
      f = integer_zero_node;
    }
  else
    {
      f = TYPE_MIN_VALUE (expr_type);
      t = TYPE_MAX_VALUE (expr_type);
    }


  switch (TREE_CODE (expr))
    {
    case EQ_EXPR:
    case NE_EXPR:
    case LE_EXPR:
    case GE_EXPR:
    case LT_EXPR:
    case GT_EXPR:
    case TRUTH_ANDIF_EXPR:
    case TRUTH_ORIF_EXPR:
    case TRUTH_AND_EXPR:
    case TRUTH_OR_EXPR:
    case ERROR_MARK:
      return expr;

    case INTEGER_CST:
      /* Not 0 is true.  */
      return integer_zerop (expr) ? f : t;

    case REAL_CST:
      return real_zerop (expr) ? f : t;

    default:
      gcc_unreachable ();
    }
}

/* The following function has been copied and modified from c-convert.c.  */

/* Change of width--truncation and extension of integers or reals--
   is represented with NOP_EXPR.  Proper functioning of many things
   assumes that no other conversions can be NOP_EXPRs.

   Conversion between integer and pointer is represented with CONVERT_EXPR.
   Converting integer to real uses FLOAT_EXPR
   and real to integer uses FIX_TRUNC_EXPR.

   Here is a list of all the functions that assume that widening and
   narrowing is always done with a NOP_EXPR:
     In convert.c, convert_to_integer.
     In c-typeck.c, build_binary_op (boolean ops), and
	c_common_truthvalue_conversion.
     In expr.c: expand_expr, for operands of a MULT_EXPR.
     In fold-const.c: fold.
     In tree.c: get_narrower and get_unwidened.  */

/* Subroutines of `convert'.  */



/* Create an expression whose value is that of EXPR,
   converted to type TYPE.  The TREE_TYPE of the value
   is always TYPE.  This function implements all reasonable
   conversions; callers should filter out those that are
   not permitted by the language being compiled.  */

tree
convert (tree type, tree expr)
{
  tree e = expr;
  enum tree_code code = TREE_CODE (type);
  const char *invalid_conv_diag;

  if (type == error_mark_node
      || expr == error_mark_node
      || TREE_TYPE (expr) == error_mark_node)
    return error_mark_node;

  if ((invalid_conv_diag
       = targetm.invalid_conversion (TREE_TYPE (expr), type)))
    {
      error (invalid_conv_diag);
      return error_mark_node;
    }

  if (type == TREE_TYPE (expr))
    return expr;

  if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
    return fold_build1 (NOP_EXPR, type, expr);
  if (TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
    return error_mark_node;
  if (TREE_CODE (TREE_TYPE (expr)) == VOID_TYPE || code == VOID_TYPE)
    {
      gcc_unreachable ();
    }
  if (code == INTEGER_TYPE || code == ENUMERAL_TYPE)
    return fold (convert_to_integer (type, e));
  if (code == BOOLEAN_TYPE)
    {
      tree t = ortho_truthvalue_conversion (expr);
      if (TREE_CODE (t) == ERROR_MARK)
	return t;

      /* If it returns a NOP_EXPR, we must fold it here to avoid
	 infinite recursion between fold () and convert ().  */
      if (TREE_CODE (t) == NOP_EXPR)
	return fold_build1 (NOP_EXPR, type, TREE_OPERAND (t, 0));
      else
	return fold_build1 (NOP_EXPR, type, t);
    }
  if (code == POINTER_TYPE || code == REFERENCE_TYPE)
    return fold (convert_to_pointer (type, e));
  if (code == REAL_TYPE)
    return fold (convert_to_real (type, e));

  gcc_unreachable ();
}

#ifndef MAX_BITS_PER_WORD
#define MAX_BITS_PER_WORD BITS_PER_WORD
#endif

/*  This variable keeps a table for types for each precision so that we only
    allocate each of them once. Signed and unsigned types are kept separate.
 */
static GTY(()) tree signed_and_unsigned_types[MAX_BITS_PER_WORD + 1][2];

/*  Return an integer type with the number of bits of precision given by
    PRECISION.  UNSIGNEDP is nonzero if the type is unsigned; otherwise
    it is a signed type.  */
static tree
type_for_size (unsigned int precision, int unsignedp)
{
  tree t;

  if (precision <= MAX_BITS_PER_WORD
      && signed_and_unsigned_types[precision][unsignedp] != NULL_TREE)
    return signed_and_unsigned_types[precision][unsignedp];

  if (unsignedp)
    t = make_unsigned_type (precision);
  else
    t = make_signed_type (precision);

  if (precision <= MAX_BITS_PER_WORD)
    signed_and_unsigned_types[precision][unsignedp] = t;

  return t;
}

/*  Return a data type that has machine mode MODE.  UNSIGNEDP selects
    an unsigned type; otherwise a signed type is returned.  */
static tree
type_for_mode (enum machine_mode mode, int unsignedp)
{
  if (SCALAR_INT_MODE_P (mode))
    return type_for_size (GET_MODE_BITSIZE (mode), unsignedp);

  if (mode == TYPE_MODE (void_type_node))
    return void_type_node;

  if (mode == TYPE_MODE (float_type_node))
    return float_type_node;

  if (mode == TYPE_MODE (double_type_node))
    return double_type_node;

  if (mode == TYPE_MODE (long_double_type_node))
    return long_double_type_node;

   if (VECTOR_MODE_P (mode))
    {
      machine_mode inner_mode = GET_MODE_INNER (mode);
      tree inner_type = type_for_mode (inner_mode, unsignedp);
      if (inner_type)
	return build_vector_type_for_mode (inner_type, mode);
    }

  return NULL_TREE;
}

#undef LANG_HOOKS_NAME
#define LANG_HOOKS_NAME "vhdl"
#undef LANG_HOOKS_IDENTIFIER_SIZE
#define LANG_HOOKS_IDENTIFIER_SIZE sizeof (struct tree_identifier)
#undef LANG_HOOKS_INIT
#define LANG_HOOKS_INIT ortho_init
#undef LANG_HOOKS_FINISH
#define LANG_HOOKS_FINISH ortho_finish
#undef LANG_HOOKS_OPTION_LANG_MASK
#define LANG_HOOKS_OPTION_LANG_MASK ortho_option_lang_mask
#undef LANG_HOOKS_HANDLE_OPTION
#define LANG_HOOKS_HANDLE_OPTION ortho_handle_option
#undef LANG_HOOKS_POST_OPTIONS
#define LANG_HOOKS_POST_OPTIONS ortho_post_options
#undef LANG_HOOKS_HONOR_READONLY
#define LANG_HOOKS_HONOR_READONLY true
#undef LANG_HOOKS_MARK_ADDRESSABLE
#define LANG_HOOKS_MARK_ADDRESSABLE ortho_mark_addressable
#undef LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION
#define LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION ortho_expand_function

#undef LANG_HOOKS_TYPE_FOR_MODE
#define LANG_HOOKS_TYPE_FOR_MODE type_for_mode
#undef LANG_HOOKS_TYPE_FOR_SIZE
#define LANG_HOOKS_TYPE_FOR_SIZE type_for_size
#undef LANG_HOOKS_PARSE_FILE
#define LANG_HOOKS_PARSE_FILE ortho_parse_file

#define pushlevel lhd_do_nothing_i
#define poplevel lhd_do_nothing_iii_return_null_tree
#define set_block lhd_do_nothing_t
#undef LANG_HOOKS_GETDECLS
#define LANG_HOOKS_GETDECLS lhd_return_null_tree_v

struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;

union GTY((desc ("0"),
	   chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
  lang_tree_node
{
  union tree_node GTY((tag ("0"),
		       desc ("tree_node_structure (&%h)"))) generic;
};

/* GHDL does not use the lang_decl and lang_type.

   FIXME: the variable_size annotation here is needed because these types are
   variable-sized in some other front-ends.  Due to gengtype deficiency, the
   GTY options of such types have to agree across all front-ends.  */

struct GTY((variable_size)) lang_type { char dummy; };
struct GTY((variable_size)) lang_decl { char dummy; };

struct GTY(()) language_function
{
  char dummy;
};


extern "C" {

struct GTY(()) chain_constr_type
{
  tree first;
  tree last;
};

static void
chain_init (struct chain_constr_type *constr)
{
  constr->first = NULL_TREE;
  constr->last = NULL_TREE;
}

static void
chain_append (struct chain_constr_type *constr, tree el)
{
  if (constr->first == NULL_TREE)
    {
      gcc_assert (constr->last == NULL_TREE);
      constr->first = el;
    }
  else
    TREE_CHAIN (constr->last) = el;
  constr->last = el;
}

struct GTY(()) list_constr_type
{
  tree first;
  tree last;
};

static void
list_init (struct list_constr_type *constr)
{
  constr->first = NULL_TREE;
  constr->last = NULL_TREE;
}

static void
ortho_list_append (struct list_constr_type *constr, tree el)
{
  tree res;

  res = tree_cons (NULL_TREE, el, NULL_TREE);
  if (constr->first == NULL_TREE)
    constr->first = res;
  else
    TREE_CHAIN (constr->last) = res;
  constr->last = res;
}

enum ON_op_kind {
  /*  Not an operation; invalid.  */
  ON_Nil,

  /*  Dyadic operations.  */
  ON_Add_Ov,
  ON_Sub_Ov,
  ON_Mul_Ov,
  ON_Div_Ov,
  ON_Rem_Ov,
  ON_Mod_Ov,

  /*  Binary operations.  */
  ON_And,
  ON_Or,
  ON_Xor,

  /*  Monadic operations.  */
  ON_Not,
  ON_Neg_Ov,
  ON_Abs_Ov,

  /*  Comparaisons  */
  ON_Eq,
  ON_Neq,
  ON_Le,
  ON_Lt,
  ON_Ge,
  ON_Gt,

  ON_LAST
};

static enum tree_code ON_op_to_TREE_CODE[ON_LAST] = {
  ERROR_MARK,

  PLUS_EXPR,
  MINUS_EXPR,
  MULT_EXPR,
  ERROR_MARK,
  TRUNC_MOD_EXPR,
  FLOOR_MOD_EXPR,

  BIT_AND_EXPR,
  BIT_IOR_EXPR,
  BIT_XOR_EXPR,

  BIT_NOT_EXPR,
  NEGATE_EXPR,
  ABS_EXPR,

  EQ_EXPR,
  NE_EXPR,
  LE_EXPR,
  LT_EXPR,
  GE_EXPR,
  GT_EXPR,
};

tree
new_dyadic_op (enum ON_op_kind kind, tree left, tree right)
{
  tree left_type;
  enum tree_code code;

  /* Truncate to avoid representations issue.  */
  kind = (enum ON_op_kind)((unsigned)kind & 0xff);

  left_type = TREE_TYPE (left);
  gcc_assert (left_type == TREE_TYPE (right));

  switch (kind)
    {
    case ON_Div_Ov:
      if (TREE_CODE (left_type) == REAL_TYPE)
	code = RDIV_EXPR;
      else
	code = TRUNC_DIV_EXPR;
      break;
    default:
      code = ON_op_to_TREE_CODE[kind];
      break;
    }
  return build2 (code, left_type, left, right);
}

tree
new_monadic_op (enum ON_op_kind kind, tree operand)
{
  /* Truncate to avoid representations issue.  */
  kind = (enum ON_op_kind)((unsigned)kind & 0xff);

  return build1 (ON_op_to_TREE_CODE[kind], TREE_TYPE (operand), operand);
}

tree
new_compare_op (enum ON_op_kind kind, tree left, tree right, tree ntype)
{
  gcc_assert (TREE_CODE (ntype) == BOOLEAN_TYPE);
  gcc_assert (TREE_TYPE (left) == TREE_TYPE (right));

  /* Truncate to avoid representations issue.  */
  kind = (enum ON_op_kind)((unsigned)kind & 0xff);

  return build2 (ON_op_to_TREE_CODE[kind], ntype, left, right);
}

tree
new_convert (tree val, tree rtype)
{
  tree val_type;
  enum tree_code val_code;
  enum tree_code rtype_code;
  enum tree_code code;

  val_type = TREE_TYPE (val);
  if (val_type == rtype)
    return val;

  /*  FIXME: check conversions.  */
  val_code = TREE_CODE (val_type);
  rtype_code = TREE_CODE (rtype);
  if (val_code == POINTER_TYPE && rtype_code == POINTER_TYPE)
    code = NOP_EXPR;
  else if (val_code == INTEGER_TYPE && rtype_code == INTEGER_TYPE)
    code = CONVERT_EXPR;
  else if (val_code == REAL_TYPE && rtype_code == INTEGER_TYPE)
    {
      /*  REAL to INTEGER
          Gcc only handles FIX_TRUNC_EXPR, but we need rounding.  */
      tree m_p5;


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