SENG (sieve_engine)

struct sieve_engine {
  SIEVE *sieve;       /* which script */
  ec_message *_vmsg;
  validate_context *ctx;
  accept_construct *ac;
  char *phase;
  int plen;
  struct {
    rfc2822_context rfc2822ctx;
    ec_mime_context mimectx;
    int mime_error;
    unsigned valid_rfc2822:1;
    unsigned valid_mimectx:1;
  } legacy;

  /* misc bits for actions to draw upon at runtime */
  ec_bag *bag;

  int rc; /* return code */
  int pc; /* program counter */

  Event *session;
  int dns_complete;

  SIEVEARGS *rv;        /* return value, for assignment */
  ec_hash_table *variables;   /* maps variable names to SIEVEVARs */

  unsigned should_free_ac:1;
  unsigned can_go_async:1;
  /* if true, then we last use the message in a legacy context */
  unsigned legacy_msg:1;
  unsigned orig_was_legacy:1;
  unsigned _spare:4;

  SIEVEARGS *args;  /* argument context for next extension action call */
  SIEVEARGS *arg_stringlist; /* stringlist being built for insertion into args */

  void *module_data; /* for extension actions to use to stash data when returning SIV_AGAIN */

  /* when we reach the end of the current program, pop the opstack */
  struct sieve_op_stack *opstack;

  int error_mode;
  int can;
};