/*
 * Copyright (c) 2007 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 "vpi_config.h"

# include  "vpi_user.h"
# include  "sdf_priv.h"
# include  <stdlib.h>
# include  <string.h>
# include  <assert.h>

/*
 * These are static context
 */

  /* Scope of the $sdf_annotate call. Annotation starts here. */
static vpiHandle sdf_scope;
  /* The cell in process. */
static vpiHandle sdf_cur_cell;

/*
 * These functions are called by the SDF parser during parsing to
 * handling items discovered in the parse.
 */
void sdf_select_instance(const char*celltype, const char*cellinst)
{
      vpiHandle idx = vpi_iterate(vpiModule, sdf_scope);
      assert(idx);

      vpiHandle cur;
      while ( (cur = vpi_scan(idx)) ) {

	      /* If we find the cell in this scope, then save it for
	         future processing. */
	    if ( strcmp(cellinst, vpi_get_str(vpiName,cur)) == 0) {
		  sdf_cur_cell = cur;
		  vpi_free_object(idx);

		    /* The scope that matches should be a module. */
		  if (vpi_get(vpiType,sdf_cur_cell) != vpiModule) {
			vpi_printf("SDF ERROR: Scope %s in %s is not a module.\n",
				   cellinst, vpi_get_str(vpiName,sdf_scope));
		  }
		    /* The matching scope (a module) should have the
		       expected type. */
		  if (strcmp(celltype,vpi_get_str(vpiDefName,sdf_cur_cell)) != 0) {
			vpi_printf("SDF ERROR: Module %s in %s is not a %s; "
				   "it is an %s\n", cellinst,
				   vpi_get_str(vpiName,sdf_scope), celltype,
				   vpi_get_str(vpiDefName,sdf_cur_cell));
		  }

		  return;
	    }
      }

      sdf_cur_cell = 0;
      vpi_printf("SDF WARNING: Unable to find %s in current scope\n", cellinst);
}

void sdf_iopath_delays(const char*src, const char*dst)
{
      assert(sdf_cur_cell);

      vpiHandle idx = vpi_iterate(vpiModPath, sdf_cur_cell);
      assert(idx);

	/* Search for the modpath that matches the IOPATH by looking
	   for the modpath that uses the same ports as the ports that
	   the parser has found. */
      vpiHandle path;
      while ( (path = vpi_scan(idx)) ) {
	    vpiHandle path_in = vpi_handle(vpiModPathIn,path);
	    vpiHandle path_out = vpi_handle(vpiModPathOut,path);

	    path_in = vpi_handle(vpiExpr,path_in);
	    path_out = vpi_handle(vpiExpr,path_out);
	    assert(vpi_get(vpiType,path_in) == vpiNet);
	    assert(vpi_get(vpiType,path_out) == vpiNet);

	      /* If the src name doesn't match, go on. */
	    if (strcmp(src,vpi_get_str(vpiName,path_in)) != 0)
		  continue;

	      /* If the dst name doesn't match, go on. */
	    if (strcmp(dst,vpi_get_str(vpiName,path_out)) != 0)
		  continue;

	      /* Ah, this must be a match! */
	    break;
      }

      if (path == 0) {
	    vpi_printf("SDF ERROR: Unable to find ModPath %s -> %s in %s\n",
		       src, dst, vpi_get_str(vpiName,sdf_cur_cell));
	    return;
      }

        /* No longer need the iterator. */
      vpi_free_object(idx);

      vpi_printf("XXXX Found the modpath object.\n");
}

static PLI_INT32 sys_sdf_annotate_compiletf(PLI_BYTE8*name)
{
      return 0;
}

static PLI_INT32 sys_sdf_annotate_calltf(PLI_BYTE8*name)
{
      s_vpi_value value;
      vpiHandle sys = vpi_handle(vpiSysTfCall,0);
      vpiHandle argv = vpi_iterate(vpiArgument, sys);

      vpiHandle path = vpi_scan(argv);
      assert(path);

      vpi_free_object(argv);

      value.format = vpiStringVal;
      vpi_get_value(path, &value);

      if ((value.format != vpiStringVal) || !value.value.str) {
	    vpi_printf("ERROR: %s: File name argument (type=%d)"
		       " does not have a string value\n",
		       name, vpi_get(vpiType, path));
	    return 0;
      }

      char*path_str = strdup(value.value.str);
      FILE*sdf_fd = fopen(path_str, "r");
      assert(sdf_fd);

      sdf_scope = vpi_handle(vpiScope,sys);
      sdf_cur_cell = 0;

      sdf_process_file(sdf_fd, path_str);

      fclose(sdf_fd);
      free(path_str);
      return 0;
}

void sys_sdf_register()
{
      s_vpi_systf_data tf_data;

      tf_data.type      = vpiSysTask;
      tf_data.tfname    = "$sdf_annotate";
      tf_data.calltf    = sys_sdf_annotate_calltf;
      tf_data.compiletf = sys_sdf_annotate_compiletf;
      tf_data.sizetf    = 0;
      tf_data.user_data = "$sdf_annotate";
      vpi_register_systf(&tf_data);
}