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rpc_cout.c

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user or with the express written consent of
 * Sun Microsystems, Inc.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

/*
 * From: @(#)rpc_cout.c 1.13 89/02/22 (C) 1987 SMI
 */
char cout_rcsid[] =
"$Id: rpc_cout.c,v 1.13 2001/09/05 00:07:01 drepper Exp $";

/*
 * rpc_cout.c, XDR routine outputter for the RPC protocol compiler
 */
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "rpc_parse.h"
#include "rpc_util.h"
#include "proto.h"

static void emit_enum (definition * def);
static void emit_program (const definition * def);
static void emit_union (const definition * def);
static void emit_struct (definition * def);
static void emit_typedef (const definition * def);
static void emit_inline (int indent, declaration * decl, int flag);
static void emit_single_in_line (int indent, declaration *decl, int flag,
                         relation rel);
static int findtype (const definition * def, const char *type);
static int undefined (const char *type);
static void print_generic_header (const char *procname, int pointerp);
static void print_ifopen (int indent, const char *name);
static void print_ifarg (const char *arg);
static void print_ifsizeof (int indent, const char *prefix, const char *type);
static void print_ifclose (int indent);
static void print_ifstat (int indent, const char *prefix, const char *type,
                    relation rel, const char *amax,
                    const char *objname, const char *name);
static void print_stat (int indent, const declaration * dec);
static void print_header (const definition * def);
static void print_trailer (void);
static char *upcase (const char *str);

/*
 * Emit the C-routine for the given definition
 */
void
emit (definition * def)
{
  if (def->def_kind == DEF_CONST)
    {
      return;
    }
  if (def->def_kind == DEF_PROGRAM)
    {
      emit_program (def);
      return;
    }
  if (def->def_kind == DEF_TYPEDEF)
    {
      /* now we need to handle declarations like
         struct typedef foo foo;
         since we don't want this to be expanded
         into 2 calls to xdr_foo */

      if (strcmp (def->def.ty.old_type, def->def_name) == 0)
      return;
    };

  print_header (def);
  switch (def->def_kind)
    {
    case DEF_UNION:
      emit_union (def);
      break;
    case DEF_ENUM:
      emit_enum (def);
      break;
    case DEF_STRUCT:
      emit_struct (def);
      break;
    case DEF_TYPEDEF:
      emit_typedef (def);
      break;
    default:
      /* can't happen */
      break;
    }
  print_trailer ();
}

static int
findtype (const definition * def, const char *type)
{
  if (def->def_kind == DEF_PROGRAM || def->def_kind == DEF_CONST)
    {
      return 0;
    }
  else
    {
      return (streq (def->def_name, type));
    }
}

static int
undefined (const char *type)
{
  definition *def;
  def = (definition *) FINDVAL (defined, type, findtype);
  return (def == NULL);
}


static void
print_generic_header (const char *procname, int pointerp)
{
  f_print (fout, "\n");
  f_print (fout, "bool_t\n");
  if (Cflag)
    {
      f_print (fout, "xdr_%s (", procname);
      f_print (fout, "XDR *xdrs, ");
      f_print (fout, "%s ", procname);
      if (pointerp)
      f_print (fout, "*");
      f_print (fout, "objp)\n{\n");
    }
  else
    {
      f_print (fout, "xdr_%s (xdrs, objp)\n", procname);
      f_print (fout, "\tXDR *xdrs;\n");
      f_print (fout, "\t%s ", procname);
      if (pointerp)
      f_print (fout, "*");
      f_print (fout, "objp;\n{\n");
    }
}

static void
print_header (const definition * def)
{
  print_generic_header (def->def_name,
                  def->def_kind != DEF_TYPEDEF ||
                  !isvectordef (def->def.ty.old_type,
                              def->def.ty.rel));

  /* Now add Inline support */

  if (inlineflag == 0)
    return;
  /*May cause lint to complain. but  ... */
  f_print (fout, "\tregister int32_t *buf;\n\n");
}

static void
print_prog_header (const proc_list * plist)
{
  print_generic_header (plist->args.argname, 1);
}

static void
print_trailer (void)
{
  f_print (fout, "\treturn TRUE;\n");
  f_print (fout, "}\n");
}


static void
print_ifopen (int indent, const char *name)
{
  tabify (fout, indent);
  f_print (fout, " if (!xdr_%s (xdrs", name);
}

static void
print_ifarg (const char *arg)
{
  f_print (fout, ", %s", arg);
}

static void
print_ifsizeof (int indent, const char *prefix, const char *type)
{
  if (indent)
    {
      fprintf (fout, ",\n");
      tabify (fout, indent);
    }
  else
    fprintf (fout, ", ");

  if (streq (type, "bool"))
    fprintf (fout, "sizeof (bool_t), (xdrproc_t) xdr_bool");
  else
    {
      fprintf (fout, "sizeof (");
      if (undefined (type) && prefix)
      {
        f_print (fout, "%s ", prefix);
      }
      fprintf (fout, "%s), (xdrproc_t) xdr_%s", type, type);
    }
}

static void
print_ifclose (int indent)
{
  f_print (fout, "))\n");
  tabify (fout, indent);
  f_print (fout, "\t return FALSE;\n");
}

static void
print_ifstat (int indent, const char *prefix, const char *type, relation rel,
            const char *amax, const char *objname, const char *name)
{
  const char *alt = NULL;

  switch (rel)
    {
    case REL_POINTER:
      print_ifopen (indent, "pointer");
      print_ifarg ("(char **)");
      f_print (fout, "%s", objname);
      print_ifsizeof (0, prefix, type);
      break;
    case REL_VECTOR:
      if (streq (type, "string"))
      {
        alt = "string";
      }
      else if (streq (type, "opaque"))
      {
        alt = "opaque";
      }
      if (alt)
      {
        print_ifopen (indent, alt);
        print_ifarg (objname);
      }
      else
      {
        print_ifopen (indent, "vector");
        print_ifarg ("(char *)");
        f_print (fout, "%s", objname);
      }
      print_ifarg (amax);
      if (!alt)
      {
        print_ifsizeof (indent + 1, prefix, type);
      }
      break;
    case REL_ARRAY:
      if (streq (type, "string"))
      {
        alt = "string";
      }
      else if (streq (type, "opaque"))
      {
        alt = "bytes";
      }
      if (streq (type, "string"))
      {
        print_ifopen (indent, alt);
        print_ifarg (objname);
      }
      else
      {
        if (alt)
          {
            print_ifopen (indent, alt);
          }
        else
          {
            print_ifopen (indent, "array");
          }
        print_ifarg ("(char **)");
        if (*objname == '&')
          {
            f_print (fout, "%s.%s_val, (u_int *) %s.%s_len",
                   objname, name, objname, name);
          }
        else
          {
            f_print (fout, "&%s->%s_val, (u_int *) &%s->%s_len",
                   objname, name, objname, name);
          }
      }
      print_ifarg (amax);
      if (!alt)
      {
        print_ifsizeof (indent + 1, prefix, type);
      }
      break;
    case REL_ALIAS:
      print_ifopen (indent, type);
      print_ifarg (objname);
      break;
    }
  print_ifclose (indent);
}

static void
emit_enum (definition * def)
{
  (void) def;

  print_ifopen (1, "enum");
  print_ifarg ("(enum_t *) objp");
  print_ifclose (1);
}

static void
emit_program (const definition * def)
{
  decl_list *dl;
  version_list *vlist;
  proc_list *plist;

  for (vlist = def->def.pr.versions; vlist != NULL; vlist = vlist->next)
    for (plist = vlist->procs; plist != NULL; plist = plist->next)
      {
      if (!newstyle || plist->arg_num < 2)
        continue;       /* old style, or single argument */
      print_prog_header (plist);
      for (dl = plist->args.decls; dl != NULL;
           dl = dl->next)
        print_stat (1, &dl->decl);
      print_trailer ();
      }
}

static void
emit_union (const definition * def)
{
  declaration *dflt;
  case_list *cl;
  declaration *cs;
  char *object;
  const char *vecformat = "objp->%s_u.%s";
  const char *format = "&objp->%s_u.%s";

  print_stat (1, &def->def.un.enum_decl);
  f_print (fout, "\tswitch (objp->%s) {\n", def->def.un.enum_decl.name);
  for (cl = def->def.un.cases; cl != NULL; cl = cl->next)
    {

      f_print (fout, "\tcase %s:\n", cl->case_name);
      if (cl->contflag == 1)  /* a continued case statement */
      continue;
      cs = &cl->case_decl;
      if (!streq (cs->type, "void"))
      {
        object = alloc (strlen (def->def_name) + strlen (format) +
                    strlen (cs->name) + 1);
        if (isvectordef (cs->type, cs->rel))
          {
            s_print (object, vecformat, def->def_name,
                   cs->name);
          }
        else
          {
            s_print (object, format, def->def_name,
                   cs->name);
          }
        print_ifstat (2, cs->prefix, cs->type, cs->rel, cs->array_max,
                  object, cs->name);
        free (object);
      }
      f_print (fout, "\t\tbreak;\n");
    }
  dflt = def->def.un.default_decl;
  if (dflt != NULL)
    {
      if (!streq (dflt->type, "void"))
      {
        f_print (fout, "\tdefault:\n");
        object = alloc (strlen (def->def_name) + strlen (format) +
                    strlen (dflt->name) + 1);
        if (isvectordef (dflt->type, dflt->rel))
          {
            s_print (object, vecformat, def->def_name,
                   dflt->name);
          }
        else
          {
            s_print (object, format, def->def_name,
                   dflt->name);
          }

        print_ifstat (2, dflt->prefix, dflt->type, dflt->rel,
                  dflt->array_max, object, dflt->name);
        free (object);
        f_print (fout, "\t\tbreak;\n");
      }
#ifdef __GNU_LIBRARY__
      else
      {
        f_print (fout, "\tdefault:\n");
        f_print (fout, "\t\tbreak;\n");
      }
#endif
    }
  else
    {
      f_print (fout, "\tdefault:\n");
      f_print (fout, "\t\treturn FALSE;\n");
    }

  f_print (fout, "\t}\n");
}

static void
inline_struct (definition *def, int flag)
{
  decl_list *dl;
  int i, size;
  decl_list *cur = NULL;
  decl_list *psav;
  bas_type *ptr;
  char *sizestr;
  const char *plus;
  char ptemp[256];
  int indent = 1;

  if (flag == PUT)
    f_print (fout, "\n\tif (xdrs->x_op == XDR_ENCODE) {\n");
  else
    f_print (fout,
           "\t\treturn TRUE;\n\t} else if (xdrs->x_op == XDR_DECODE) {\n");

  i = 0;
  size = 0;
  sizestr = NULL;
  for (dl = def->def.st.decls; dl != NULL; dl = dl->next)
    {             /* xxx */
      /* now walk down the list and check for basic types */
      if ((dl->decl.prefix == NULL) &&
        ((ptr = find_type (dl->decl.type)) != NULL) &&
        ((dl->decl.rel == REL_ALIAS) || (dl->decl.rel == REL_VECTOR)))
      {
        if (i == 0)
          cur = dl;
        ++i;

        if (dl->decl.rel == REL_ALIAS)
          size += ptr->length;
        else
          {
            /* this is required to handle arrays */
            if (sizestr == NULL)
            plus = "";
            else
            plus = "+ ";

            if (ptr->length != 1)
            s_print (ptemp, " %s %s * %d", plus, dl->decl.array_max,
                   ptr->length);
            else
            s_print (ptemp, " %s%s ", plus, dl->decl.array_max);

            /*now concatenate to sizestr !!!! */
            if (sizestr == NULL)
            sizestr = strdup (ptemp);
            else
            {
              sizestr = realloc (sizestr, strlen (sizestr) +
                             strlen (ptemp) + 1);
              if (sizestr == NULL)
                {
                  f_print (stderr, "Fatal error : no memory \n");
                  crash ();
                };
              sizestr = strcat (sizestr, ptemp);
              /*build up length of array */
            }
          }
      }
      else
      {
        if (i > 0)
          {
            if (sizestr == NULL && size < inlineflag)
            {
              /* don't expand into inline code if size < inlineflag */
              while (cur != dl)
                {
                  print_stat (indent + 1, &cur->decl);
                  cur = cur->next;
                }
            }
            else
            {
              /* were already looking at a xdr_inlineable structure */
              tabify (fout, indent + 1);
              if (sizestr == NULL)
                f_print (fout, "buf = XDR_INLINE (xdrs, %d * BYTES_PER_XDR_UNIT);", size);
              else if (size == 0)
                f_print (fout,
                       "buf = XDR_INLINE (xdrs, (%s) * BYTES_PER_XDR_UNIT);",
                       sizestr);
              else
                f_print (fout,
                       "buf = XDR_INLINE (xdrs, (%d + (%s)) * BYTES_PER_XDR_UNIT);",
                       size, sizestr);
              f_print (fout, "\n");
              tabify (fout, indent + 1);
              fprintf (fout, "if (buf == NULL) {\n");
              psav = cur;
              while (cur != dl)
                {
                  print_stat (indent + 2, &cur->decl);
                  cur = cur->next;
                }

              f_print (fout, "\n\t\t} else {\n");
              cur = psav;
              while (cur != dl)
                {
                  emit_inline (indent + 1, &cur->decl, flag);
                  cur = cur->next;
                }
              tabify (fout, indent + 1);
              f_print (fout, "}\n");
            }
          }
        size = 0;
        i = 0;
        sizestr = NULL;
        print_stat (indent + 1, &dl->decl);
      }
    }
  if (i > 0)
    {
      if (sizestr == NULL && size < inlineflag)
      {
        /* don't expand into inline code if size < inlineflag */
        while (cur != dl)
          {
            print_stat (indent + 1, &cur->decl);
            cur = cur->next;
          }
      }
      else
      {
        /* were already looking at a xdr_inlineable structure */
        if (sizestr == NULL)
          f_print (fout,
                 "\t\tbuf = XDR_INLINE (xdrs, %d * BYTES_PER_XDR_UNIT);",
                 size);
        else if (size == 0)
          f_print (fout,
                 "\t\tbuf = XDR_INLINE (xdrs, (%s) * BYTES_PER_XDR_UNIT);",
                 sizestr);
        else
          f_print (fout,
                 "\t\tbuf = XDR_INLINE (xdrs, (%d + %s)* BYTES_PER_XDR_UNIT);",
                 size, sizestr);
        f_print (fout, "\n\t\tif (buf == NULL) {\n");
        psav = cur;
        while (cur != NULL)
          {
            print_stat (indent + 2, &cur->decl);
            cur = cur->next;
          }
        f_print (fout, "\t\t} else {\n");

        cur = psav;
        while (cur != dl)
          {
            emit_inline (indent + 2, &cur->decl, flag);
            cur = cur->next;
          }
        f_print (fout, "\t\t}\n");
      }
    }
}

/* this may be const.  i haven't traced this one through yet. */

static void
emit_struct (definition * def)
{
  decl_list *dl;
  int j, size, flag;
  bas_type *ptr;
  int can_inline;


  if (inlineflag == 0)
    {
      /* No xdr_inlining at all */
      for (dl = def->def.st.decls; dl != NULL; dl = dl->next)
      print_stat (1, &dl->decl);
      return;
    }

  for (dl = def->def.st.decls; dl != NULL; dl = dl->next)
    if (dl->decl.rel == REL_VECTOR)
      {
      f_print (fout, "\tint i;\n");
      break;
      }

  size = 0;
  can_inline = 0;
  /*
   * Make a first pass and see if inling is possible.
   */
  for (dl = def->def.st.decls; dl != NULL; dl = dl->next)
    if ((dl->decl.prefix == NULL) &&
      ((ptr = find_type (dl->decl.type)) != NULL) &&
      ((dl->decl.rel == REL_ALIAS) || (dl->decl.rel == REL_VECTOR)))
      {
      if (dl->decl.rel == REL_ALIAS)
        size += ptr->length;
      else
        {
          can_inline = 1;
          break;        /* can be inlined */
        }
      }
    else
      {
      if (size >= inlineflag)
        {
          can_inline = 1;
          break;        /* can be inlined */
        }
      size = 0;
      }
  if (size > inlineflag)
    can_inline = 1;

  if (can_inline == 0)
    {             /* can not inline, drop back to old mode */
      for (dl = def->def.st.decls; dl != NULL; dl = dl->next)
      print_stat (1, &dl->decl);
      return;
    };

  flag = PUT;
  for (j = 0; j < 2; j++)
    {
      inline_struct (def, flag);
      if (flag == PUT)
      flag = GET;
    }

  f_print (fout, "\t return TRUE;\n\t}\n\n");

  /* now take care of XDR_FREE case */

  for (dl = def->def.st.decls; dl != NULL; dl = dl->next)
    print_stat (1, &dl->decl);
}

static void
emit_typedef (const definition * def)
{
  const char *prefix = def->def.ty.old_prefix;
  const char *type = def->def.ty.old_type;
  const char *amax = def->def.ty.array_max;
  relation rel = def->def.ty.rel;

  print_ifstat (1, prefix, type, rel, amax, "objp", def->def_name);
}

static void
print_stat (int indent, const declaration * dec)
{
  const char *prefix = dec->prefix;
  const char *type = dec->type;
  const char *amax = dec->array_max;
  relation rel = dec->rel;
  char name[256];

  if (isvectordef (type, rel))
    {
      s_print (name, "objp->%s", dec->name);
    }
  else
    {
      s_print (name, "&objp->%s", dec->name);
    }
  print_ifstat (indent, prefix, type, rel, amax, name, dec->name);
}


static void
emit_inline (int indent, declaration * decl, int flag)
{
  switch (decl->rel)
    {
    case REL_ALIAS:
      emit_single_in_line (indent, decl, flag, REL_ALIAS);
      break;
    case REL_VECTOR:
      tabify (fout, indent);
      f_print (fout, "{\n");
      tabify (fout, indent + 1);
      f_print (fout, "register %s *genp;\n\n", decl->type);
      tabify (fout, indent + 1);
      f_print (fout,
             "for (i = 0, genp = objp->%s;\n", decl->name);
      tabify (fout, indent + 2);
      f_print (fout, "i < %s; ++i) {\n", decl->array_max);
      emit_single_in_line (indent + 2, decl, flag, REL_VECTOR);
      tabify (fout, indent + 1);
      f_print (fout, "}\n");
      tabify (fout, indent);
      f_print (fout, "}\n");
      break;
    default:
      break;
      /* ?... do nothing I guess */
    }
}

static void
emit_single_in_line (int indent, declaration *decl, int flag, relation rel)
{
  char *upp_case;
  int freed = 0;

  tabify (fout, indent);
  if (flag == PUT)
    f_print (fout, "IXDR_PUT_");
  else
    {
      if (rel == REL_ALIAS)
      f_print (fout, "objp->%s = IXDR_GET_", decl->name);
      else
      f_print (fout, "*genp++ = IXDR_GET_");
    }

  upp_case = upcase (decl->type);

  /* hack  - XX */
  if (!strcmp (upp_case, "INT"))
    {
      free (upp_case);
      freed = 1;
      /* Casting is safe since the `freed' flag is set.  */
      upp_case = (char *) "LONG";
    }

  if (!strcmp (upp_case, "U_INT"))
    {
      free (upp_case);
      freed = 1;
      /* Casting is safe since the `freed' flag is set.  */
      upp_case = (char *) "U_LONG";
    }

  if (flag == PUT)
    {
      if (rel == REL_ALIAS)
      f_print (fout, "%s(buf, objp->%s);\n", upp_case, decl->name);
      else
      f_print (fout, "%s(buf, *genp++);\n", upp_case);
    }
  else
    {
      f_print (fout, "%s(buf);\n", upp_case);
    }

  if (!freed)
    free (upp_case);
}


static char *
upcase (const char *str)
{
  char *ptr, *hptr;
  ptr = malloc (strlen (str) + 1);
  if (ptr == NULL)
    {
      f_print (stderr, "malloc failed\n");
      exit (1);
    }
  hptr = ptr;
  while (*str != '\0')
    *ptr++ = toupper (*str++);

  *ptr = '\0';
  return hptr;
}

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