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sys_vcd.c

/*
 * Copyright (c) 1999-2009 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 "sys_priv.h"

/*
 * This file contains the implementations of the VCD related
 * funcitons.
 */

# include  "vpi_user.h"
# include  <stdio.h>
# include  <stdlib.h>
# include  <string.h>
# include  <assert.h>
# include  <time.h>
#ifdef HAVE_MALLOC_H
# include  <malloc.h>
#endif
# include  "vcd_priv.h"

static char*dump_path = 0;
static FILE*dump_file = 0;

static const char*units_names[] = {
      "s",
      "ms",
      "us",
      "ns",
      "ps",
      "fs"
};

struct vcd_info {
      vpiHandle item;
      vpiHandle cb;
      struct t_vpi_time time;
      const char*ident;
      struct vcd_info* next;
      struct vcd_info* dmp_next;
      int scheduled;
};


static char vcdid[8] = "!";

static void gen_new_vcd_id(void)
{
      static unsigned value = 0;
      unsigned v = ++value;
      unsigned int i;

      for (i=0; i < sizeof(vcdid)-1; i++) {
           vcdid[i] = (char)((v%94)+33); /* for range 33..126 */
           v /= 94;
           if(!v) {
                 vcdid[i+1] = '\0';
                 break;
           }
      }
}

static struct vcd_info *vcd_list = 0;
static struct vcd_info *vcd_dmp_list = 0;
PLI_UINT64 vcd_cur_time = 0;
static int dump_is_off = 0;
static long dump_limit = 0;
static int dump_is_full = 0;
static int finish_status = 0;

static char *truncate_bitvec(char *s)
{
      char l, r;

      r=*s;
      if(r=='1') return s;
      else s += 1;

      for(;;s++) {
          l=r; r=*s;
          if(!r) return (s-1);
          if(l!=r) return(((l=='0')&&(r=='1'))?s:s-1);
      }
}

static void show_this_item(struct vcd_info*info)
{
      s_vpi_value value;

      if (vpi_get(vpiType, info->item) == vpiRealVar) {
          value.format = vpiRealVal;
          vpi_get_value(info->item, &value);
          fprintf(dump_file, "r%.16g %s\n", value.value.real, info->ident);

      } else if (vpi_get(vpiSize, info->item) == 1) {
          value.format = vpiBinStrVal;
          vpi_get_value(info->item, &value);
          fprintf(dump_file, "%s%s\n", value.value.str, info->ident);
      } else {
          value.format = vpiBinStrVal;
          vpi_get_value(info->item, &value);
          fprintf(dump_file, "b%s %s\n", truncate_bitvec(value.value.str),
                info->ident);
      }
}


static void show_this_item_x(struct vcd_info*info)
{
      if (vpi_get(vpiType, info->item) == vpiRealVar) {
            /* Some tools dump nothing here...? */
          fprintf(dump_file, "rNaN %s\n", info->ident);
      } else if (vpi_get(vpiSize, info->item) == 1) {
          fprintf(dump_file, "x%s\n", info->ident);
      } else {
          fprintf(dump_file, "bx %s\n", info->ident);
      }
}


/*
 * managed qsorted list of scope names/variables for duplicates bsearching
 */

struct vcd_names_list_s vcd_tab = { 0 };
struct vcd_names_list_s vcd_var = { 0 };


static int dumpvars_status = 0; /* 0:fresh 1:cb installed, 2:callback done */
static PLI_UINT64 dumpvars_time;
__inline__ static int dump_header_pending(void)
{
      return dumpvars_status != 2;
}

/*
 * This function writes out all the traced variables, whether they
 * changed or not.
 */
static void vcd_checkpoint()
{
      struct vcd_info*cur;

      for (cur = vcd_list ;  cur ;  cur = cur->next)
          show_this_item(cur);
}

static void vcd_checkpoint_x()
{
      struct vcd_info*cur;

      for (cur = vcd_list ;  cur ;  cur = cur->next)
          show_this_item_x(cur);
}

static PLI_INT32 variable_cb_2(p_cb_data cause)
{
      struct vcd_info* info = vcd_dmp_list;
      PLI_UINT64 now = timerec_to_time64(cause->time);

      if (now != vcd_cur_time) {
          fprintf(dump_file, "#%" PLI_UINT64_FMT "\n", now);
          vcd_cur_time = now;
      }

      do {
           show_this_item(info);
           info->scheduled = 0;
      } while ((info = info->dmp_next) != 0);

      vcd_dmp_list = 0;

      return 0;
}

static PLI_INT32 variable_cb_1(p_cb_data cause)
{
      struct t_cb_data cb;
      struct vcd_info*info = (struct vcd_info*)cause->user_data;

      if (dump_is_full) return 0;
      if (dump_is_off) return 0;
      if (dump_header_pending()) return 0;
      if (info->scheduled) return 0;

      if ((dump_limit > 0) && (ftell(dump_file) > dump_limit)) {
            dump_is_full = 1;
            vpi_printf("WARNING: Dump file limit (%ld bytes) "
                               "exceeded.\n", dump_limit);
            fprintf(dump_file, "$comment Dump file limit (%ld bytes) "
                               "exceeded. $end\n", dump_limit);
            return 0;
      }

      if (!vcd_dmp_list) {
          cb = *cause;
          cb.reason = cbReadOnlySynch;
          cb.cb_rtn = variable_cb_2;
          vpi_register_cb(&cb);
      }

      info->scheduled = 1;
      info->dmp_next  = vcd_dmp_list;
      vcd_dmp_list    = info;

      return 0;
}

static PLI_INT32 dumpvars_cb(p_cb_data cause)
{
      if (dumpvars_status != 1) return 0;

      dumpvars_status = 2;

      dumpvars_time = timerec_to_time64(cause->time);
      vcd_cur_time = dumpvars_time;

      fprintf(dump_file, "$enddefinitions $end\n");

      if (!dump_is_off) {
          fprintf(dump_file, "#%" PLI_UINT64_FMT "\n", dumpvars_time);
          fprintf(dump_file, "$dumpvars\n");
          vcd_checkpoint();
          fprintf(dump_file, "$end\n");
      }

      return 0;
}

static PLI_INT32 finish_cb(p_cb_data cause)
{
      struct vcd_info *cur, *next;

      if (finish_status != 0) return 0;

      finish_status = 1;

      dumpvars_time = timerec_to_time64(cause->time);

      if (!dump_is_off && !dump_is_full && dumpvars_time != vcd_cur_time) {
          fprintf(dump_file, "#%" PLI_UINT64_FMT "\n", dumpvars_time);
      }

      fclose(dump_file);

      for (cur = vcd_list ;  cur ;  cur = next) {
          next = cur->next;
          free((char *)cur->ident);
          free(cur);
      }
      vcd_list = 0;
      vcd_names_delete(&vcd_tab);
      vcd_names_delete(&vcd_var);
      nexus_ident_delete();
      free(dump_path);
      dump_path = 0;

      return 0;
}

__inline__ static int install_dumpvars_callback(void)
{
      struct t_cb_data cb;
      static struct t_vpi_time now;

      if (dumpvars_status == 1) return 0;

      if (dumpvars_status == 2) {
          vpi_printf("VCD warning: $dumpvars ignored, previously"
                     " called at simtime %" PLI_UINT64_FMT "\n",
                     dumpvars_time);
          return 1;
      }

      now.type = vpiSimTime;
      cb.time = &now;
      cb.reason = cbReadOnlySynch;
      cb.cb_rtn = dumpvars_cb;
      cb.user_data = 0x0;
      cb.obj = 0x0;

      vpi_register_cb(&cb);

      cb.reason = cbEndOfSimulation;
      cb.cb_rtn = finish_cb;

      vpi_register_cb(&cb);

      dumpvars_status = 1;
      return 0;
}

static PLI_INT32 sys_dumpoff_calltf(PLI_BYTE8*name)
{
      s_vpi_time now;
      PLI_UINT64 now64;

      if (dump_is_off) return 0;

      dump_is_off = 1;

      if (dump_file == 0) return 0;
      if (dump_header_pending()) return 0;

      now.type = vpiSimTime;
      vpi_get_time(0, &now);
      now64 = timerec_to_time64(&now);

      if (now64 > vcd_cur_time) {
          fprintf(dump_file, "#%" PLI_UINT64_FMT "\n", now64);
          vcd_cur_time = now64;
      }

      fprintf(dump_file, "$dumpoff\n");
      vcd_checkpoint_x();
      fprintf(dump_file, "$end\n");

      return 0;
}

static PLI_INT32 sys_dumpon_calltf(PLI_BYTE8*name)
{
      s_vpi_time now;
      PLI_UINT64 now64;

      if (!dump_is_off) return 0;

      dump_is_off = 0;

      if (dump_file == 0) return 0;
      if (dump_header_pending()) return 0;

      now.type = vpiSimTime;
      vpi_get_time(0, &now);
      now64 = timerec_to_time64(&now);

      if (now64 > vcd_cur_time) {
          fprintf(dump_file, "#%" PLI_UINT64_FMT "\n", now64);
          vcd_cur_time = now64;
      }

      fprintf(dump_file, "$dumpon\n");
      vcd_checkpoint();
      fprintf(dump_file, "$end\n");

      return 0;
}

static PLI_INT32 sys_dumpall_calltf(PLI_BYTE8*name)
{
      s_vpi_time now;
      PLI_UINT64 now64;

      if (dump_is_off) return 0;
      if (dump_file == 0) return 0;
      if (dump_header_pending()) return 0;

      now.type = vpiSimTime;
      vpi_get_time(0, &now);
      now64 = timerec_to_time64(&now);

      if (now64 > vcd_cur_time) {
          fprintf(dump_file, "#%" PLI_UINT64_FMT "\n", now64);
          vcd_cur_time = now64;
      }

      fprintf(dump_file, "$dumpall\n");
      vcd_checkpoint();
      fprintf(dump_file, "$end\n");

      return 0;
}

static void open_dumpfile(vpiHandle callh)
{
      if (dump_path == 0) dump_path = strdup("dump.vcd");

      dump_file = fopen(dump_path, "w");

      if (dump_file == 0) {
          vpi_printf("VCD Error: %s:%d: ", vpi_get_str(vpiFile, callh),
                     (int)vpi_get(vpiLineNo, callh));
          vpi_printf("Unable to open %s for output.\n", dump_path);
          vpi_control(vpiFinish, 1);
          return;
      } else {
          int prec = vpi_get(vpiTimePrecision, 0);
          unsigned scale = 1;
          unsigned udx = 0;
          time_t walltime;

          vpi_printf("VCD info: dumpfile %s opened for output.\n",
                     dump_path);

          time(&walltime);

          assert(prec >= -15);
          while (prec < 0) {
              udx += 1;
              prec += 3;
          }
          while (prec > 0) {
              scale *= 10;
              prec -= 1;
          }

          fprintf(dump_file, "$date\n");
          fprintf(dump_file, "\t%s",asctime(localtime(&walltime)));
          fprintf(dump_file, "$end\n");
          fprintf(dump_file, "$version\n");
          fprintf(dump_file, "\tIcarus Verilog\n");
          fprintf(dump_file, "$end\n");
          fprintf(dump_file, "$timescale\n");
          fprintf(dump_file, "\t%u%s\n", scale, units_names[udx]);
          fprintf(dump_file, "$end\n");
      }
}

static PLI_INT32 sys_dumpfile_calltf(PLI_BYTE8*name)
{
      vpiHandle callh = vpi_handle(vpiSysTfCall, 0);
      vpiHandle argv = vpi_iterate(vpiArgument, callh);
      char *path;

        /* $dumpfile must be called before $dumpvars starts! */
      if (dumpvars_status != 0) {
          char msg [64];
          snprintf(msg, 64, "VCD warning: %s:%d:",
                   vpi_get_str(vpiFile, callh),
                   (int)vpi_get(vpiLineNo, callh));
          vpi_printf("%s %s called after $dumpvars started,\n", msg, name);
          vpi_printf("%*s using existing file (%s).\n",
                     (int) strlen(msg), " ", dump_path);
          vpi_free_object(argv);
          return 0;
      }

      path = get_filename(callh, name, vpi_scan(argv));
      vpi_free_object(argv);
      if (! path) return 0;

      if (dump_path) {
          vpi_printf("VCD warning: %s:%d: ", vpi_get_str(vpiFile, callh),
                     (int)vpi_get(vpiLineNo, callh));
          vpi_printf("Overriding dump file %s with %s.\n", dump_path, path);
          free(dump_path);
      }
      dump_path = path;

      return 0;
}

static PLI_INT32 sys_dumpflush_calltf(PLI_BYTE8*name)
{
      if (dump_file) fflush(dump_file);

      return 0;
}

static PLI_INT32 sys_dumplimit_calltf(PLI_BYTE8 *name)
{
      vpiHandle callh = vpi_handle(vpiSysTfCall, 0);
      vpiHandle argv = vpi_iterate(vpiArgument, callh);
      s_vpi_value val;

      /* Get the value and set the dump limit. */
      assert(argv);
      val.format = vpiIntVal;
      vpi_get_value(vpi_scan(argv), &val);
      dump_limit = val.value.integer;

      vpi_free_object(argv);
      return 0;
}

static void scan_item(unsigned depth, vpiHandle item, int skip)
{
      struct t_cb_data cb;
      struct vcd_info* info;

      const char* type;
      const char* name;
      const char* prefix;
      const char* ident;
      int nexus_id;

      /* list of types to iterate upon */
      int i;
      static int types[] = {
          /* Value */
          vpiNet,
          vpiReg,
          vpiVariables,
          /* Scope */
          vpiFunction,
          vpiModule,
          vpiNamedBegin,
          vpiNamedFork,
          vpiTask,
          -1
      };

      switch (vpi_get(vpiType, item)) {

        case vpiNet:  type = "wire";    if(0){
        case vpiIntegerVar:
        case vpiMemoryWord:
        case vpiTimeVar:
        case vpiReg:  type = "reg";    }

            /* Skip this signal if it has already been included. */
          if (vcd_names_search(&vcd_var, vpi_get_str(vpiFullName, item))) {
              vpi_printf("VCD warning: skipping signal %s, it was "
                         "previously included.\n",
                         vpi_get_str(vpiFullName, item));
              break;
          }

            if (skip || vpi_get(vpiAutomatic, item)) break;

          name = vpi_get_str(vpiName, item);
          prefix = is_escaped_id(name) ? "\\" : "";

          nexus_id = vpi_get(_vpiNexusId, item);

          if (nexus_id) {
              ident = find_nexus_ident(nexus_id);
          } else {
              ident = 0;
          }

          if (!ident) {
              ident = strdup(vcdid);
              gen_new_vcd_id();

              if (nexus_id) set_nexus_ident(nexus_id, ident);

              info = malloc(sizeof(*info));

              info->time.type = vpiSimTime;
              info->item  = item;
              info->ident = ident;
              info->scheduled = 0;

              cb.time      = &info->time;
              cb.user_data = (char*)info;
              cb.value     = NULL;
              cb.obj       = item;
              cb.reason    = cbValueChange;
              cb.cb_rtn    = variable_cb_1;


              info->next      = vcd_list;
              info->dmp_next  = 0;
              vcd_list    = info;

              info->cb    = vpi_register_cb(&cb);
          }

          fprintf(dump_file, "$var %s %u %s %s%s",
                type, vpi_get(vpiSize, item), ident,
                prefix, name);
      /* FIXME
          if (vpi_get(vpiVector, item)
      */
          if (vpi_get(vpiSize, item) > 1
            || vpi_get(vpiLeftRange, item) != 0) {
              fprintf(dump_file, " [%i:%i]", vpi_get(vpiLeftRange, item),
                    vpi_get(vpiRightRange, item));
          }
          fprintf(dump_file, " $end\n");
          break;

        case vpiRealVar:

            /* Skip this signal if it has already been included. */
          if (vcd_names_search(&vcd_var, vpi_get_str(vpiFullName, item))) {
              vpi_printf("VCD warning: skipping signal %s, it was "
                         "previously included.\n",
                         vpi_get_str(vpiFullName, item));
              break;
          }

            if (skip || vpi_get(vpiAutomatic, item)) break;

            /* Declare the variable in the VCD file. */
          name = vpi_get_str(vpiName, item);
          prefix = is_escaped_id(name) ? "\\" : "";
          ident = strdup(vcdid);
          gen_new_vcd_id();
          fprintf(dump_file, "$var real 1 %s %s%s $end\n",
                ident, prefix, name);

            /* Add a callback for the variable. */
          info = malloc(sizeof(*info));

          info->time.type = vpiSimTime;
          info->item  = item;
          info->ident = ident;
          info->scheduled = 0;

          cb.time      = &info->time;
          cb.user_data = (char*)info;
          cb.value     = NULL;
          cb.obj       = item;
          cb.reason    = cbValueChange;
          cb.cb_rtn    = variable_cb_1;

          info->next  = vcd_list;
          info->dmp_next  = 0;
          vcd_list    = info;

          info->cb    = vpi_register_cb(&cb);

          break;

        case vpiModule:      type = "module";      if(0){
        case vpiNamedBegin:  type = "begin";      }if(0){
        case vpiTask:        type = "task";       }if(0){
        case vpiFunction:    type = "function";   }if(0){
        case vpiNamedFork:   type = "fork";       }

          if (depth > 0) {
              int nskip;
              vpiHandle argv;

              const char* fullname =
                  vpi_get_str(vpiFullName, item);

#if 0
              vpi_printf("VCD info: scanning scope %s, %u levels\n",
                         fullname, depth);
#endif
              nskip = 0 != vcd_names_search(&vcd_tab, fullname);

              if (!nskip)
                  vcd_names_add(&vcd_tab, fullname);
              else
                vpi_printf("VCD warning: ignoring signals in "
                           "previously scanned scope %s\n", fullname);

              name = vpi_get_str(vpiName, item);

              fprintf(dump_file, "$scope %s %s $end\n", type, name);

              for (i=0; types[i]>0; i++) {
                  vpiHandle hand;
                  argv = vpi_iterate(types[i], item);
                  while (argv && (hand = vpi_scan(argv))) {
                        scan_item(depth-1, hand, nskip);
                  }
              }

              fprintf(dump_file, "$upscope $end\n");
          }
          break;

        default:
          vpi_printf("VCD warning: $dumpvars: Unsupported parameter "
                     "type (%s)\n", vpi_get_str(vpiType, item));
      }
}

static int draw_scope(vpiHandle item, vpiHandle callh)
{
      int depth;
      const char *name;
      char *type;

      vpiHandle scope = vpi_handle(vpiScope, item);
      if (!scope) return 0;

      depth = 1 + draw_scope(scope, callh);
      name = vpi_get_str(vpiName, scope);

      switch (vpi_get(vpiType, scope)) {
        case vpiNamedBegin:  type = "begin";      break;
        case vpiTask:        type = "task";       break;
        case vpiFunction:    type = "function";   break;
        case vpiNamedFork:   type = "fork";       break;
        case vpiModule:      type = "module";     break;
        default:
          vpi_printf("VCD Error: %s:%d: $dumpvars: Unsupported scope "
                     "type (%d)\n", vpi_get_str(vpiFile, callh),
                     (int)vpi_get(vpiLineNo, callh), vpi_get(vpiType, item));
            assert(0);
      }

      fprintf(dump_file, "$scope %s %s $end\n", type, name);

      return depth;
}

static PLI_INT32 sys_dumpvars_calltf(PLI_BYTE8*name)
{
      vpiHandle callh = vpi_handle(vpiSysTfCall, 0);
      vpiHandle argv = vpi_iterate(vpiArgument, callh);
      vpiHandle item;
      s_vpi_value value;
      unsigned depth = 0;

      if (dump_file == 0) {
          open_dumpfile(callh);
          if (dump_file == 0) {
              vpi_free_object(argv);
              return 0;
          }
      }

      if (install_dumpvars_callback()) {
          vpi_free_object(argv);
          return 0;
      }

        /* Get the depth if it exists. */
      if (argv) {
          value.format = vpiIntVal;
          vpi_get_value(vpi_scan(argv), &value);
          depth = value.value.integer;
      }
      if (!depth) depth = 10000;

        /* This dumps all the modules in the design if none are given. */
      if (!argv || !(item = vpi_scan(argv))) {
          argv = vpi_iterate(vpiModule, 0x0);
          assert(argv);  /* There must be at least one top level module. */
          item = vpi_scan(argv);
      }

      for ( ; item; item = vpi_scan(argv)) {
          const char *scname;
          int add_var = 0;
          int dep;

          vcd_names_sort(&vcd_tab);

            /* If this is a signal make sure it has not already
             * been included. */
          switch (vpi_get(vpiType, item)) {
              case vpiIntegerVar:
              case vpiMemoryWord:
              case vpiNet:
              case vpiRealVar:
              case vpiReg:
              case vpiTimeVar:
              scname = vpi_get_str(vpiFullName, vpi_handle(vpiScope, item));
              if (vcd_names_search(&vcd_tab, scname)) {
                    vpi_printf("VCD warning: skipping signal %s, "
                               "it was previously included.\n",
                               vpi_get_str(vpiFullName, item));
                    continue;
              } else {
                    add_var = 1;
              }
          }

          dep = draw_scope(item, callh);

          scan_item(depth, item, 0);

          while (dep--) fprintf(dump_file, "$upscope $end\n");

            /* Add this signal to the variable list so we can verify it
             * is not included twice. This must be done after it has
             * been added */
          if (add_var) {
              vcd_names_add(&vcd_var, vpi_get_str(vpiFullName, item));
              vcd_names_sort(&vcd_var);
          }
      }

      return 0;
}

void sys_vcd_register()
{
      s_vpi_systf_data tf_data;

      /* All the compiletf routines are located in vcd_priv.c. */

      tf_data.type      = vpiSysTask;
      tf_data.tfname    = "$dumpall";
      tf_data.calltf    = sys_dumpall_calltf;
      tf_data.compiletf = sys_no_arg_compiletf;
      tf_data.sizetf    = 0;
      tf_data.user_data = "$dumpall";
      vpi_register_systf(&tf_data);

      tf_data.type      = vpiSysTask;
      tf_data.tfname    = "$dumpfile";
      tf_data.calltf    = sys_dumpfile_calltf;
      tf_data.compiletf = sys_one_string_arg_compiletf;
      tf_data.sizetf    = 0;
      tf_data.user_data = "$dumpfile";
      vpi_register_systf(&tf_data);

      tf_data.type      = vpiSysTask;
      tf_data.tfname    = "$dumpflush";
      tf_data.calltf    = sys_dumpflush_calltf;
      tf_data.compiletf = sys_no_arg_compiletf;
      tf_data.sizetf    = 0;
      tf_data.user_data = "$dumpflush";
      vpi_register_systf(&tf_data);

      tf_data.type      = vpiSysTask;
      tf_data.tfname    = "$dumplimit";
      tf_data.calltf    = sys_dumplimit_calltf;
      tf_data.compiletf = sys_one_numeric_arg_compiletf;
      tf_data.sizetf    = 0;
      tf_data.user_data = "$dumplimit";
      vpi_register_systf(&tf_data);

      tf_data.type      = vpiSysTask;
      tf_data.tfname    = "$dumpoff";
      tf_data.calltf    = sys_dumpoff_calltf;
      tf_data.compiletf = sys_no_arg_compiletf;
      tf_data.sizetf    = 0;
      tf_data.user_data = "$dumpoff";
      vpi_register_systf(&tf_data);

      tf_data.type      = vpiSysTask;
      tf_data.tfname    = "$dumpon";
      tf_data.calltf    = sys_dumpon_calltf;
      tf_data.compiletf = sys_no_arg_compiletf;
      tf_data.sizetf    = 0;
      tf_data.user_data = "$dumpon";
      vpi_register_systf(&tf_data);

      tf_data.type      = vpiSysTask;
      tf_data.tfname    = "$dumpvars";
      tf_data.calltf    = sys_dumpvars_calltf;
      tf_data.compiletf = sys_dumpvars_compiletf;
      tf_data.sizetf    = 0;
      tf_data.user_data = "$dumpvars";
      vpi_register_systf(&tf_data);
}

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