7085 add support for "if" and "else" statements in dtrace

*** 25,34 ****
--- 25,38 ----
  /*
   * Copyright (c) 2013 by Delphix. All rights reserved.
   * Copyright (c) 2013 Joyent, Inc. All rights reserved.
   */
  
+ /*
+  * Copyright (c) 2014 by Delphix. All rights reserved.
+  */
+ 
  #ifndef _DT_PARSER_H
  #define _DT_PARSER_H
  
  #include <sys/types.h>
  #include <sys/dtrace.h>
*** 103,112 ****
--- 107,122 ----
                          char *_name;            /* string name of provider */
                          struct dt_provider *_pvp; /* provider references */
                          struct dt_node *_probes;  /* list of probe nodes */
                          int _redecl;            /* provider redeclared */
                  } _provider;
+ 
+                 struct {
+                         struct dt_node *_conditional;
+                         struct dt_node *_body;
+                         struct dt_node *_alternate_body;
+                 } _conditional;
          } dn_u;
  
          struct dt_node *dn_list; /* parse tree list link */
          struct dt_node *dn_link; /* allocation list link */
  } dt_node_t;
*** 138,147 ****
--- 148,162 ----
  #define dn_provname     dn_u._provider._name    /* DT_NODE_PROVIDER */
  #define dn_provider     dn_u._provider._pvp     /* DT_NODE_PROVIDER */
  #define dn_provred      dn_u._provider._redecl  /* DT_NODE_PROVIDER */
  #define dn_probes       dn_u._provider._probes  /* DT_NODE_PROVIDER */
  
+ /* DT_NODE_IF: */
+ #define dn_conditional          dn_u._conditional._conditional
+ #define dn_body                 dn_u._conditional._body
+ #define dn_alternate_body       dn_u._conditional._alternate_body
+ 
  #define DT_NODE_FREE    0       /* unused node (waiting to be freed) */
  #define DT_NODE_INT     1       /* integer value */
  #define DT_NODE_STRING  2       /* string value */
  #define DT_NODE_IDENT   3       /* identifier */
  #define DT_NODE_VAR     4       /* variable reference */
*** 160,169 ****
--- 175,185 ----
  #define DT_NODE_MEMBER  17      /* member definition */
  #define DT_NODE_XLATOR  18      /* translator definition */
  #define DT_NODE_PROBE   19      /* probe definition */
  #define DT_NODE_PROVIDER 20     /* provider definition */
  #define DT_NODE_PROG    21      /* program translation unit */
+ #define DT_NODE_IF      22      /* if statement */
  
  #define DT_NF_SIGNED    0x01    /* data is a signed quantity (else unsigned) */
  #define DT_NF_COOKED    0x02    /* data is a known type (else still cooking) */
  #define DT_NF_REF       0x04    /* pass by reference (array, struct, union) */
  #define DT_NF_LVALUE    0x08    /* node is an l-value according to ANSI-C */
*** 211,220 ****
--- 227,237 ----
  extern dt_node_t *dt_node_member(dt_decl_t *, char *, dt_node_t *);
  extern dt_node_t *dt_node_xlator(dt_decl_t *, dt_decl_t *, char *, dt_node_t *);
  extern dt_node_t *dt_node_probe(char *, int, dt_node_t *, dt_node_t *);
  extern dt_node_t *dt_node_provider(char *, dt_node_t *);
  extern dt_node_t *dt_node_program(dt_node_t *);
+ extern dt_node_t *dt_node_if(dt_node_t *, dt_node_t *, dt_node_t *);
  
  extern dt_node_t *dt_node_link(dt_node_t *, dt_node_t *);
  extern dt_node_t *dt_node_cook(dt_node_t *, uint_t);
  
  extern dt_node_t *dt_node_xalloc(dtrace_hdl_t *, int);
*** 235,244 ****
--- 252,262 ----
  extern void dt_node_promote(dt_node_t *, dt_node_t *, dt_node_t *);
  
  extern void dt_node_diftype(dtrace_hdl_t *,
      const dt_node_t *, dtrace_diftype_t *);
  extern void dt_node_printr(dt_node_t *, FILE *, int);
+ extern void dt_printd(dt_node_t *, FILE *, int);
  extern const char *dt_node_name(const dt_node_t *, char *, size_t);
  extern int dt_node_root(dt_node_t *);
  
  struct dtrace_typeinfo; /* see <dtrace.h> */
  struct dt_pcb;          /* see <dt_impl.h> */