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/*
* Copyright (c) 2004-2008 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/

# include "config.h"
# include "compiler.h"
# include <stdio.h>
# include <cstring>
# include <cstdlib>

/*
* Manage the information about system functions. This information is
* collected from the sources before elaboration and made available
* via the lookup_sys_func function.
*/

static const struct sfunc_return_type sfunc_table[] = {
      { "$realtime", IVL_VT_REAL, 1, 0 },
      { "$bitstoreal", IVL_VT_REAL, 1, 0 },
      { "$itor", IVL_VT_REAL, 1, 0 },
      { "$realtobits", IVL_VT_LOGIC, 64, 0 },
      { "$time", IVL_VT_LOGIC, 64, 0 },
      { "$stime", IVL_VT_LOGIC, 32, 0 },
      { "$simtime", IVL_VT_LOGIC, 64, 0 },
      { 0, IVL_VT_LOGIC, 32, 0 }
};

struct sfunc_return_type_cell : sfunc_return_type {
      struct sfunc_return_type_cell*next;
};

static struct sfunc_return_type_cell*sfunc_stack = 0;

const struct sfunc_return_type* lookup_sys_func(const char*name)
{
/* First, try to find then name in the function stack. */
      struct sfunc_return_type_cell*cur = sfunc_stack;
      while (cur) {
if (strcmp(cur->name, name) == 0)
return cur;

cur = cur->next;
      }

/* Next, look in the core table. */
      unsigned idx = 0;
      while (sfunc_table[idx].name) {

if (strcmp(sfunc_table[idx].name, name) == 0)
return sfunc_table + idx;

idx += 1;
      }

/* No luck finding, so return the trailer, which give a
default description. */
      return sfunc_table + idx;
}

/*
* This function loads a system functions descriptor file with the
* format:
*
* <name> <type> [<arguments>]
*/
int load_sys_func_table(const char*path)
{
      struct sfunc_return_type_cell*cell;
      FILE*fd = fopen(path, "r");

      if (fd == 0) {
if (verbose_flag) {
fprintf(stderr, "%s: Unable to open System Function Table file.\n", path);
}
return -1;
      }

      if (verbose_flag) {
fprintf(stderr, "%s: Processing System Function Table file.\n", path);
      }

      char buf[256];
      while (fgets(buf, sizeof buf, fd)) {
char*name = buf + strspn(buf, " \t\r\n");

/* Skip empty lines. */
if (name[0] == 0)
continue;
/* Skip comment lines. */
if (name[0] == '#')
continue;

char*cp = name + strcspn(name, " \t\r\n");
if (cp[0]) *cp++ = 0;

cp += strspn(cp, " \t\r\n");

char*stype = cp;
if (stype[0] == 0) {
fprintf(stderr, "%s:%s: No function type?\n",
path, name);
continue;
}

cp = stype + strcspn(stype, " \t\r\n");
if (cp[0]) *cp++ = 0;

if (strcmp(stype,"vpiSysFuncReal") == 0) {
cell = new struct sfunc_return_type_cell;
cell->name = lex_strings.add(name);
cell->type = IVL_VT_REAL;
cell->wid = 1;
cell->signed_flag = true;
cell->next = sfunc_stack;
sfunc_stack = cell;
continue;
}

if (strcmp(stype,"vpiSysFuncInt") == 0) {
cell = new struct sfunc_return_type_cell;
cell->name = lex_strings.add(name);
cell->type = IVL_VT_LOGIC;
cell->wid = 32;
cell->signed_flag = true;
cell->next = sfunc_stack;
sfunc_stack = cell;
continue;
}

/* If this is a sized integer, then parse the additional
arguments, the width (decimal) and the optional
signed/unsigned flag. */
if (strcmp(stype,"vpiSysFuncSized") == 0) {
cp += strspn(cp, " \t\r\n");
char*swidth = cp;
unsigned width = 32;
bool signed_flag = false;

cp = swidth + strcspn(swidth, " \t\r\n");
if (cp[0]) *cp++ = 0;

width = strtoul(swidth, 0, 10);

cp += strspn(cp, " \t\r\n");
char*flag = cp;

while (flag[0]) {
cp = flag + strcspn(flag, " \t\r\n");
if (cp[0]) *cp++ = 0;

if (strcmp(flag,"signed") == 0) {
signed_flag = true;

} else if (strcmp(flag,"unsigned") == 0) {
signed_flag = false;
}

flag = cp + strspn(cp, " \t\r\n");
}

cell = new struct sfunc_return_type_cell;
cell->name = lex_strings.add(name);
cell->type = IVL_VT_LOGIC;
cell->wid = width;
cell->signed_flag = signed_flag;
cell->next = sfunc_stack;
sfunc_stack = cell;
continue;
}

fprintf(stderr, "%s:%s: Unknown type: %s\n",
path, name, stype);
      }

      return 0;
}
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