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rpc_parse.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_parse.c 1.8 89/02/22 (C) 1987 SMI
 */
const char parse_rcsid[] =
  "$Id: rpc_parse.c,v 1.5 2001/04/04 17:27:24 drepper Exp $";

/*
 * rpc_parse.c, Parser for the RPC protocol compiler
 * Copyright (C) 1987 Sun Microsystems, Inc.
 */
#include <stdio.h>
#include <string.h>
#include "rpc/types.h"
#include "rpc_scan.h"
#include "rpc_parse.h"
#include "rpc_util.h"
#include "proto.h"

#define ARGNAME "arg"

static void isdefined (definition * defp);
static void def_struct (definition * defp);
static void def_program (definition * defp);
static void def_enum (definition * defp);
static void def_const (definition * defp);
static void def_union (definition * defp);
static void check_type_name (const char *name, int new_type);
static void def_typedef (definition * defp);
static void get_declaration (declaration * dec, defkind dkind);
static void get_prog_declaration (declaration * dec, defkind dkind, int num);
static void get_type (const char **prefixp, const char **typep, defkind dkind);
static void unsigned_dec (const char **typep);

/*
 * return the next definition you see
 */
definition *
get_definition (void)
{
  definition *defp;
  token tok;

  defp = ALLOC (definition);
  get_token (&tok);
  switch (tok.kind)
    {
    case TOK_STRUCT:
      def_struct (defp);
      break;
    case TOK_UNION:
      def_union (defp);
      break;
    case TOK_TYPEDEF:
      def_typedef (defp);
      break;
    case TOK_ENUM:
      def_enum (defp);
      break;
    case TOK_PROGRAM:
      def_program (defp);
      break;
    case TOK_CONST:
      def_const (defp);
      break;
    case TOK_EOF:
      return (NULL);
    default:
      error ("definition keyword expected");
    }
  scan (TOK_SEMICOLON, &tok);
  isdefined (defp);
  return (defp);
}

static void
isdefined (definition * defp)
{
  STOREVAL (&defined, defp);
}

static void
def_struct (definition * defp)
{
  token tok;
  declaration dec;
  decl_list *decls;
  decl_list **tailp;

  defp->def_kind = DEF_STRUCT;

  scan (TOK_IDENT, &tok);
  defp->def_name = tok.str;
  scan (TOK_LBRACE, &tok);
  tailp = &defp->def.st.decls;
  do
    {
      get_declaration (&dec, DEF_STRUCT);
      decls = ALLOC (decl_list);
      decls->decl = dec;
      *tailp = decls;
      tailp = &decls->next;
      scan (TOK_SEMICOLON, &tok);
      peek (&tok);
    }
  while (tok.kind != TOK_RBRACE);
  get_token (&tok);
  *tailp = NULL;
}

static void
def_program (definition * defp)
{
  token tok;
  declaration dec;
  decl_list *decls;
  decl_list **tailp;
  version_list *vlist;
  version_list **vtailp;
  proc_list *plist;
  proc_list **ptailp;
  int num_args;
  bool_t isvoid = FALSE;      /* whether first argument is void */
  defp->def_kind = DEF_PROGRAM;
  scan (TOK_IDENT, &tok);
  defp->def_name = tok.str;
  scan (TOK_LBRACE, &tok);
  vtailp = &defp->def.pr.versions;
  tailp = &defp->def.st.decls;
  scan (TOK_VERSION, &tok);
  do
    {
      scan (TOK_IDENT, &tok);
      vlist = ALLOC (version_list);
      vlist->vers_name = tok.str;
      scan (TOK_LBRACE, &tok);
      ptailp = &vlist->procs;
      do
      {
        /* get result type */
        plist = ALLOC (proc_list);
        get_type (&plist->res_prefix, &plist->res_type,
                DEF_PROGRAM);
        if (streq (plist->res_type, "opaque"))
          {
            error ("illegal result type");
          }
        scan (TOK_IDENT, &tok);
        plist->proc_name = tok.str;
        scan (TOK_LPAREN, &tok);
        /* get args - first one */
        num_args = 1;
        isvoid = FALSE;
        /* type of DEF_PROGRAM in the first
         * get_prog_declaration and DEF_STURCT in the next
         * allows void as argument if it is the only argument
         */
        get_prog_declaration (&dec, DEF_PROGRAM, num_args);
        if (streq (dec.type, "void"))
          isvoid = TRUE;
        decls = ALLOC (decl_list);
        plist->args.decls = decls;
        decls->decl = dec;
        tailp = &decls->next;
        /* get args */
        while (peekscan (TOK_COMMA, &tok))
          {
            num_args++;
            get_prog_declaration (&dec, DEF_STRUCT,
                            num_args);
            decls = ALLOC (decl_list);
            decls->decl = dec;
            *tailp = decls;
            if (streq (dec.type, "void"))
            isvoid = TRUE;
            tailp = &decls->next;
          }
        /* multiple arguments are only allowed in newstyle */
        if (!newstyle && num_args > 1)
          {
            error ("only one argument is allowed");
          }
        if (isvoid && num_args > 1)
          {
            error ("illegal use of void in program definition");
          }
        *tailp = NULL;
        scan (TOK_RPAREN, &tok);
        scan (TOK_EQUAL, &tok);
        scan_num (&tok);
        scan (TOK_SEMICOLON, &tok);
        plist->proc_num = tok.str;
        plist->arg_num = num_args;
        *ptailp = plist;
        ptailp = &plist->next;
        peek (&tok);
      }
      while (tok.kind != TOK_RBRACE);
      *ptailp = NULL;
      *vtailp = vlist;
      vtailp = &vlist->next;
      scan (TOK_RBRACE, &tok);
      scan (TOK_EQUAL, &tok);
      scan_num (&tok);
      vlist->vers_num = tok.str;
      /* make the argument structure name for each arg */
      for (plist = vlist->procs; plist != NULL;
         plist = plist->next)
      {
        plist->args.argname = make_argname (plist->proc_name,
                                    vlist->vers_num);
        /* free the memory ?? */
      }
      scan (TOK_SEMICOLON, &tok);
      scan2 (TOK_VERSION, TOK_RBRACE, &tok);
    }
  while (tok.kind == TOK_VERSION);
  scan (TOK_EQUAL, &tok);
  scan_num (&tok);
  defp->def.pr.prog_num = tok.str;
  *vtailp = NULL;
}


static void
def_enum (definition * defp)
{
  token tok;
  enumval_list *elist;
  enumval_list **tailp;

  defp->def_kind = DEF_ENUM;
  scan (TOK_IDENT, &tok);
  defp->def_name = tok.str;
  scan (TOK_LBRACE, &tok);
  tailp = &defp->def.en.vals;
  do
    {
      scan (TOK_IDENT, &tok);
      elist = ALLOC (enumval_list);
      elist->name = tok.str;
      elist->assignment = NULL;
      scan3 (TOK_COMMA, TOK_RBRACE, TOK_EQUAL, &tok);
      if (tok.kind == TOK_EQUAL)
      {
        scan_num (&tok);
        elist->assignment = tok.str;
        scan2 (TOK_COMMA, TOK_RBRACE, &tok);
      }
      *tailp = elist;
      tailp = &elist->next;
    }
  while (tok.kind != TOK_RBRACE);
  *tailp = NULL;
}

static void
def_const (definition * defp)
{
  token tok;

  defp->def_kind = DEF_CONST;
  scan (TOK_IDENT, &tok);
  defp->def_name = tok.str;
  scan (TOK_EQUAL, &tok);
  scan2 (TOK_IDENT, TOK_STRCONST, &tok);
  defp->def.co = tok.str;
}

static void
def_union (definition *defp)
{
  token tok;
  declaration dec;
  case_list *cases;
/*  case_list *tcase; */
  case_list **tailp;
  int flag;

  defp->def_kind = DEF_UNION;
  scan (TOK_IDENT, &tok);
  defp->def_name = tok.str;
  scan (TOK_SWITCH, &tok);
  scan (TOK_LPAREN, &tok);
  get_declaration (&dec, DEF_UNION);
  defp->def.un.enum_decl = dec;
  tailp = &defp->def.un.cases;
  scan (TOK_RPAREN, &tok);
  scan (TOK_LBRACE, &tok);
  scan (TOK_CASE, &tok);
  while (tok.kind == TOK_CASE)
    {
      scan2 (TOK_IDENT, TOK_CHARCONST, &tok);
      cases = ALLOC (case_list);
      cases->case_name = tok.str;
      scan (TOK_COLON, &tok);
      /* now peek at next token */
      flag = 0;
      if (peekscan (TOK_CASE, &tok))
      {

        do
          {
            scan2 (TOK_IDENT, TOK_CHARCONST, &tok);
            cases->contflag = 1;    /* continued case statement */
            *tailp = cases;
            tailp = &cases->next;
            cases = ALLOC (case_list);
            cases->case_name = tok.str;
            scan (TOK_COLON, &tok);

          }
        while (peekscan (TOK_CASE, &tok));
      }
      else if (flag)
      {

        *tailp = cases;
        tailp = &cases->next;
        cases = ALLOC (case_list);
      };

      get_declaration (&dec, DEF_UNION);
      cases->case_decl = dec;
      cases->contflag = 0;    /* no continued case statement */
      *tailp = cases;
      tailp = &cases->next;
      scan (TOK_SEMICOLON, &tok);

      scan3 (TOK_CASE, TOK_DEFAULT, TOK_RBRACE, &tok);
    }
  *tailp = NULL;
  if (tok.kind == TOK_DEFAULT)
    {
      scan (TOK_COLON, &tok);
      get_declaration (&dec, DEF_UNION);
      defp->def.un.default_decl = ALLOC (declaration);
      *defp->def.un.default_decl = dec;
      scan (TOK_SEMICOLON, &tok);
      scan (TOK_RBRACE, &tok);
    }
  else
    {
      defp->def.un.default_decl = NULL;
    }
}

static const char *reserved_words[] =
{
  "array",
  "bytes",
  "destroy",
  "free",
  "getpos",
  "inline",
  "pointer",
  "reference",
  "setpos",
  "sizeof",
  "union",
  "vector",
  NULL
};

static const char *reserved_types[] =
{
  "opaque",
  "string",
  NULL
};

/*
 * check that the given name is not one that would eventually result in
 * xdr routines that would conflict with internal XDR routines.
 */
static void
check_type_name (const char *name, int new_type)
{
  int i;
  char tmp[100];

  for (i = 0; reserved_words[i] != NULL; i++)
    {
      if (strcmp (name, reserved_words[i]) == 0)
      {
        sprintf (tmp,
            "illegal (reserved) name :\'%s\' in type definition", name);
        error (tmp);
      }
    }
  if (new_type)
    {
      for (i = 0; reserved_types[i] != NULL; i++)
      {
        if (strcmp (name, reserved_types[i]) == 0)
          {
            sprintf (tmp,
            "illegal (reserved) name :\'%s\' in type definition", name);
            error (tmp);
          }
      }
    }
}



static void
def_typedef (definition * defp)
{
  declaration dec;

  defp->def_kind = DEF_TYPEDEF;
  get_declaration (&dec, DEF_TYPEDEF);
  defp->def_name = dec.name;
  check_type_name (dec.name, 1);
  defp->def.ty.old_prefix = dec.prefix;
  defp->def.ty.old_type = dec.type;
  defp->def.ty.rel = dec.rel;
  defp->def.ty.array_max = dec.array_max;
}

static void
get_declaration (declaration * dec, defkind dkind)
{
  token tok;

  get_type (&dec->prefix, &dec->type, dkind);
  dec->rel = REL_ALIAS;
  if (streq (dec->type, "void"))
    {
      return;
    }

  check_type_name (dec->type, 0);

  scan2 (TOK_STAR, TOK_IDENT, &tok);
  if (tok.kind == TOK_STAR)
    {
      dec->rel = REL_POINTER;
      scan (TOK_IDENT, &tok);
    }
  dec->name = tok.str;
  if (peekscan (TOK_LBRACKET, &tok))
    {
      if (dec->rel == REL_POINTER)
      {
        error ("no array-of-pointer declarations -- use typedef");
      }
      dec->rel = REL_VECTOR;
      scan_num (&tok);
      dec->array_max = tok.str;
      scan (TOK_RBRACKET, &tok);
    }
  else if (peekscan (TOK_LANGLE, &tok))
    {
      if (dec->rel == REL_POINTER)
      {
        error ("no array-of-pointer declarations -- use typedef");
      }
      dec->rel = REL_ARRAY;
      if (peekscan (TOK_RANGLE, &tok))
      {
        dec->array_max = "~0";      /* unspecified size, use max */
      }
      else
      {
        scan_num (&tok);
        dec->array_max = tok.str;
        scan (TOK_RANGLE, &tok);
      }
    }
  if (streq (dec->type, "opaque"))
    {
      if (dec->rel != REL_ARRAY && dec->rel != REL_VECTOR)
      {
        error ("array declaration expected");
      }
    }
  else if (streq (dec->type, "string"))
    {
      if (dec->rel != REL_ARRAY)
      {
        error ("variable-length array declaration expected");
      }
    }
}

static void
get_prog_declaration (declaration * dec, defkind dkind, int num /* arg number */ )
{
  token tok;
  char name[10];        /* argument name */

  if (dkind == DEF_PROGRAM)
    {
      peek (&tok);
      if (tok.kind == TOK_RPAREN)
      {                 /* no arguments */
        dec->rel = REL_ALIAS;
        dec->type = "void";
        dec->prefix = NULL;
        dec->name = NULL;
        return;
      }
    }
  get_type (&dec->prefix, &dec->type, dkind);
  dec->rel = REL_ALIAS;
  if (peekscan (TOK_IDENT, &tok))   /* optional name of argument */
    strcpy (name, tok.str);
  else
    sprintf (name, "%s%d", ARGNAME, num); /* default name of argument */

  dec->name = (char *) strdup (name);

  if (streq (dec->type, "void"))
    {
      return;
    }

  if (streq (dec->type, "opaque"))
    {
      error ("opaque -- illegal argument type");
    }
  if (peekscan (TOK_STAR, &tok))
    {
      if (streq (dec->type, "string"))
      {
        error ("pointer to string not allowed in program arguments\n");
      }
      dec->rel = REL_POINTER;
      if (peekscan (TOK_IDENT, &tok))     /* optional name of argument */
      dec->name = strdup (tok.str);
    }
  if (peekscan (TOK_LANGLE, &tok))
    {
      if (!streq (dec->type, "string"))
      {
        error ("arrays cannot be declared as arguments to procedures -- use typedef");
      }
      dec->rel = REL_ARRAY;
      if (peekscan (TOK_RANGLE, &tok))
      {
        dec->array_max = "~0";      /* unspecified size, use max */
      }
      else
      {
        scan_num (&tok);
        dec->array_max = tok.str;
        scan (TOK_RANGLE, &tok);
      }
    }
  if (streq (dec->type, "string"))
    {
      if (dec->rel != REL_ARRAY)
      {                 /* .x specifies just string as
                         * type of argument
                         * - make it string<>
                         */
        dec->rel = REL_ARRAY;
        dec->array_max = "~0";      /* unspecified size, use max */
      }
    }
}

static void
get_type (const char **prefixp, const char **typep, defkind dkind)
{
  token tok;

  *prefixp = NULL;
  get_token (&tok);
  switch (tok.kind)
    {
    case TOK_IDENT:
      *typep = tok.str;
      break;
    case TOK_STRUCT:
    case TOK_ENUM:
    case TOK_UNION:
      *prefixp = tok.str;
      scan (TOK_IDENT, &tok);
      *typep = tok.str;
      break;
    case TOK_UNSIGNED:
      unsigned_dec (typep);
      break;
    case TOK_SHORT:
      *typep = "short";
      (void) peekscan (TOK_INT, &tok);
      break;
    case TOK_LONG:
      *typep = "long";
      (void) peekscan (TOK_INT, &tok);
      break;
      case TOK_HYPER:
        *typep = "int64_t";
      (void) peekscan(TOK_INT, &tok);
        break;    
    case TOK_VOID:
      if (dkind != DEF_UNION && dkind != DEF_PROGRAM)
      {
        error ("voids allowed only inside union and program definitions with one argument");
      }
      *typep = tok.str;
      break;
    case TOK_STRING:
    case TOK_OPAQUE:
    case TOK_CHAR:
    case TOK_INT:
    case TOK_FLOAT:
    case TOK_DOUBLE:
    case TOK_BOOL:
      *typep = tok.str;
      break;
    default:
      error ("expected type specifier");
    }
}

static void
unsigned_dec (const char **typep)
{
  token tok;

  peek (&tok);
  switch (tok.kind)
    {
    case TOK_CHAR:
      get_token (&tok);
      *typep = "u_char";
      break;
    case TOK_SHORT:
      get_token (&tok);
      *typep = "u_short";
      (void) peekscan (TOK_INT, &tok);
      break;
    case TOK_LONG:
      get_token (&tok);
      *typep = "u_long";
      (void) peekscan (TOK_INT, &tok);
      break;
      case TOK_HYPER:
      get_token (&tok);
        *typep = "uint64_t";
      (void) peekscan(TOK_INT, &tok);
        break;    
    case TOK_INT:
      get_token (&tok);
      *typep = "u_int";
      break;
    default:
      *typep = "u_int";
      break;
    }
}

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