Merge branch 'release/6.8.1-1'6.8.1-1

1 files changed, 1997 insertions, 556 deletions

diff --git a/src/regexec.c b/src/regexec.c
index 53f42ee..35e3698 100644
--- a/src/regexec.c
+++ b/src/regexec.c
@@ -2,7 +2,7 @@
   regexec.c -  Oniguruma (regular expression library)
 **********************************************************************/
 /*-
- * Copyright (c) 2002-2017  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
+ * Copyright (c) 2002-2018  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,11 +26,8 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
-
 #include "regint.h"
 
-#define USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
-
 #define IS_MBC_WORD_ASCII_MODE(enc,s,end,mode) \
   ((mode) == 0 ? ONIGENC_IS_MBC_WORD(enc,s,end) : ONIGENC_IS_MBC_WORD_ASCII(enc,s,end))
 
@@ -40,6 +37,565 @@
    ONIGENC_IS_MBC_NEWLINE(enc,(p+enclen(enc,p)),end))
 #endif
 
+#define CHECK_INTERRUPT_IN_MATCH
+
+#ifdef USE_CALLOUT
+typedef struct {
+  int last_match_at_call_counter;
+  struct {
+    OnigType  type;
+    OnigValue val;
+  } slot[ONIG_CALLOUT_DATA_SLOT_NUM];
+} CalloutData;
+#endif
+
+struct OnigMatchParamStruct {
+  unsigned int    match_stack_limit;
+  unsigned long   retry_limit_in_match;
+  OnigCalloutFunc progress_callout_of_contents;
+  OnigCalloutFunc retraction_callout_of_contents;
+#ifdef USE_CALLOUT
+  int             match_at_call_counter;
+  void*           callout_user_data;
+  CalloutData*    callout_data;
+  int             callout_data_alloc_num;
+#endif
+};
+
+extern int
+onig_set_match_stack_limit_size_of_match_param(OnigMatchParam* param,
+                                               unsigned int limit)
+{
+  param->match_stack_limit = limit;
+  return ONIG_NORMAL;
+}
+
+extern int
+onig_set_retry_limit_in_match_of_match_param(OnigMatchParam* param,
+                                             unsigned long limit)
+{
+  param->retry_limit_in_match = limit;
+  return ONIG_NORMAL;
+}
+
+extern int
+onig_set_progress_callout_of_match_param(OnigMatchParam* param, OnigCalloutFunc f)
+{
+  param->progress_callout_of_contents = f;
+  return ONIG_NORMAL;
+}
+
+extern int
+onig_set_retraction_callout_of_match_param(OnigMatchParam* param, OnigCalloutFunc f)
+{
+  param->retraction_callout_of_contents = f;
+  return ONIG_NORMAL;
+}
+
+
+
+typedef struct {
+  void* stack_p;
+  int   stack_n;
+  OnigOptionType options;
+  OnigRegion*    region;
+  int            ptr_num;
+  const UChar*   start;   /* search start position (for \G: BEGIN_POSITION) */
+  unsigned int   match_stack_limit;
+  unsigned long  retry_limit_in_match;
+  OnigMatchParam* mp;
+#ifdef USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE
+  int    best_len;      /* for ONIG_OPTION_FIND_LONGEST */
+  UChar* best_s;
+#endif
+} MatchArg;
+
+
+#ifdef ONIG_DEBUG
+
+/* arguments type */
+#define ARG_SPECIAL     -1
+#define ARG_NON          0
+#define ARG_RELADDR      1
+#define ARG_ABSADDR      2
+#define ARG_LENGTH       3
+#define ARG_MEMNUM       4
+#define ARG_OPTION       5
+#define ARG_MODE         6
+
+typedef struct {
+  short int opcode;
+  char*     name;
+  short int arg_type;
+} OpInfoType;
+
+static OpInfoType OpInfo[] = {
+  { OP_FINISH,            "finish",          ARG_NON },
+  { OP_END,               "end",             ARG_NON },
+  { OP_EXACT1,            "exact1",          ARG_SPECIAL },
+  { OP_EXACT2,            "exact2",          ARG_SPECIAL },
+  { OP_EXACT3,            "exact3",          ARG_SPECIAL },
+  { OP_EXACT4,            "exact4",          ARG_SPECIAL },
+  { OP_EXACT5,            "exact5",          ARG_SPECIAL },
+  { OP_EXACTN,            "exactn",          ARG_SPECIAL },
+  { OP_EXACTMB2N1,        "exactmb2-n1",     ARG_SPECIAL },
+  { OP_EXACTMB2N2,        "exactmb2-n2",     ARG_SPECIAL },
+  { OP_EXACTMB2N3,        "exactmb2-n3",     ARG_SPECIAL },
+  { OP_EXACTMB2N,         "exactmb2-n",      ARG_SPECIAL },
+  { OP_EXACTMB3N,         "exactmb3n"  ,     ARG_SPECIAL },
+  { OP_EXACTMBN,          "exactmbn",        ARG_SPECIAL },
+  { OP_EXACT1_IC,         "exact1-ic",       ARG_SPECIAL },
+  { OP_EXACTN_IC,         "exactn-ic",       ARG_SPECIAL },
+  { OP_CCLASS,            "cclass",          ARG_SPECIAL },
+  { OP_CCLASS_MB,         "cclass-mb",       ARG_SPECIAL },
+  { OP_CCLASS_MIX,        "cclass-mix",      ARG_SPECIAL },
+  { OP_CCLASS_NOT,        "cclass-not",      ARG_SPECIAL },
+  { OP_CCLASS_MB_NOT,     "cclass-mb-not",   ARG_SPECIAL },
+  { OP_CCLASS_MIX_NOT,    "cclass-mix-not",  ARG_SPECIAL },
+#ifdef USE_OP_CCLASS_NODE
+  { OP_CCLASS_NODE,       "cclass-node",     ARG_SPECIAL },
+#endif
+  { OP_ANYCHAR,           "anychar",         ARG_NON },
+  { OP_ANYCHAR_ML,        "anychar-ml",      ARG_NON },
+  { OP_ANYCHAR_STAR,      "anychar*",        ARG_NON },
+  { OP_ANYCHAR_ML_STAR,   "anychar-ml*",     ARG_NON },
+  { OP_ANYCHAR_STAR_PEEK_NEXT, "anychar*-peek-next", ARG_SPECIAL },
+  { OP_ANYCHAR_ML_STAR_PEEK_NEXT, "anychar-ml*-peek-next", ARG_SPECIAL },
+  { OP_WORD,                "word",            ARG_NON },
+  { OP_WORD_ASCII,          "word-ascii",      ARG_NON },
+  { OP_NO_WORD,             "not-word",        ARG_NON },
+  { OP_NO_WORD_ASCII,       "not-word-ascii",  ARG_NON },
+  { OP_WORD_BOUNDARY,       "word-boundary",     ARG_MODE },
+  { OP_NO_WORD_BOUNDARY,    "not-word-boundary", ARG_MODE },
+  { OP_WORD_BEGIN,          "word-begin",      ARG_MODE },
+  { OP_WORD_END,            "word-end",        ARG_MODE },
+  { OP_EXTENDED_GRAPHEME_CLUSTER_BOUNDARY, "extended-grapheme-cluster-boundary", ARG_NON },
+  { OP_NO_EXTENDED_GRAPHEME_CLUSTER_BOUNDARY, "no-extended-grapheme-cluster-boundary", ARG_NON },
+  { OP_BEGIN_BUF,           "begin-buf",       ARG_NON },
+  { OP_END_BUF,             "end-buf",         ARG_NON },
+  { OP_BEGIN_LINE,          "begin-line",      ARG_NON },
+  { OP_END_LINE,            "end-line",        ARG_NON },
+  { OP_SEMI_END_BUF,        "semi-end-buf",    ARG_NON },
+  { OP_BEGIN_POSITION,      "begin-position",  ARG_NON },
+  { OP_BACKREF1,            "backref1",             ARG_NON },
+  { OP_BACKREF2,            "backref2",             ARG_NON },
+  { OP_BACKREF_N,            "backref-n",           ARG_MEMNUM  },
+  { OP_BACKREF_N_IC,         "backref-n-ic",        ARG_SPECIAL },
+  { OP_BACKREF_MULTI,       "backref_multi",        ARG_SPECIAL },
+  { OP_BACKREF_MULTI_IC,    "backref_multi-ic",     ARG_SPECIAL },
+  { OP_BACKREF_WITH_LEVEL,  "backref_with_level",   ARG_SPECIAL },
+  { OP_BACKREF_CHECK,       "backref_check",        ARG_SPECIAL },
+  { OP_BACKREF_CHECK_WITH_LEVEL, "backref_check_with_level", ARG_SPECIAL },
+  { OP_MEMORY_START_PUSH,   "mem-start-push",       ARG_MEMNUM  },
+  { OP_MEMORY_START,        "mem-start",            ARG_MEMNUM  },
+  { OP_MEMORY_END_PUSH,     "mem-end-push",         ARG_MEMNUM  },
+  { OP_MEMORY_END_PUSH_REC, "mem-end-push-rec",     ARG_MEMNUM  },
+  { OP_MEMORY_END,          "mem-end",              ARG_MEMNUM  },
+  { OP_MEMORY_END_REC,      "mem-end-rec",          ARG_MEMNUM  },
+  { OP_SET_OPTION_PUSH,     "set-option-push",      ARG_OPTION  },
+  { OP_SET_OPTION,          "set-option",           ARG_OPTION  },
+  { OP_FAIL,                "fail",                 ARG_NON },
+  { OP_JUMP,                "jump",                 ARG_RELADDR },
+  { OP_PUSH,                "push",                 ARG_RELADDR },
+  { OP_PUSH_SUPER,          "push-super",           ARG_RELADDR },
+  { OP_POP_OUT,             "pop-out",              ARG_NON },
+  { OP_PUSH_OR_JUMP_EXACT1, "push-or-jump-e1",      ARG_SPECIAL },
+  { OP_PUSH_IF_PEEK_NEXT,   "push-if-peek-next",    ARG_SPECIAL },
+  { OP_REPEAT,              "repeat",               ARG_SPECIAL },
+  { OP_REPEAT_NG,           "repeat-ng",            ARG_SPECIAL },
+  { OP_REPEAT_INC,          "repeat-inc",           ARG_MEMNUM  },
+  { OP_REPEAT_INC_NG,       "repeat-inc-ng",        ARG_MEMNUM  },
+  { OP_REPEAT_INC_SG,       "repeat-inc-sg",        ARG_MEMNUM  },
+  { OP_REPEAT_INC_NG_SG,    "repeat-inc-ng-sg",     ARG_MEMNUM  },
+  { OP_EMPTY_CHECK_START,   "empty-check-start",    ARG_MEMNUM  },
+  { OP_EMPTY_CHECK_END,     "empty-check-end",      ARG_MEMNUM  },
+  { OP_EMPTY_CHECK_END_MEMST,"empty-check-end-memst", ARG_MEMNUM  },
+  { OP_EMPTY_CHECK_END_MEMST_PUSH,"empty-check-end-memst-push", ARG_MEMNUM  },
+  { OP_PREC_READ_START,      "push-pos",             ARG_NON },
+  { OP_PREC_READ_END,        "pop-pos",              ARG_NON },
+  { OP_PREC_READ_NOT_START,  "prec-read-not-start",  ARG_RELADDR },
+  { OP_PREC_READ_NOT_END,    "prec-read-not-end",    ARG_NON },
+  { OP_ATOMIC_START,         "atomic-start",         ARG_NON },
+  { OP_ATOMIC_END,           "atomic-end",           ARG_NON },
+  { OP_LOOK_BEHIND,          "look-behind",          ARG_SPECIAL },
+  { OP_LOOK_BEHIND_NOT_START, "look-behind-not-start", ARG_SPECIAL },
+  { OP_LOOK_BEHIND_NOT_END,  "look-behind-not-end",  ARG_NON },
+  { OP_CALL,                 "call",                 ARG_ABSADDR },
+  { OP_RETURN,               "return",               ARG_NON },
+  { OP_PUSH_SAVE_VAL,        "push-save-val",        ARG_SPECIAL },
+  { OP_UPDATE_VAR,           "update-var",           ARG_SPECIAL },
+#ifdef USE_CALLOUT
+  { OP_CALLOUT_CONTENTS,     "callout-contents",     ARG_SPECIAL },
+  { OP_CALLOUT_NAME,         "callout-name",         ARG_SPECIAL },
+#endif
+  { -1, "", ARG_NON }
+};
+
+static char*
+op2name(int opcode)
+{
+  int i;
+
+  for (i = 0; OpInfo[i].opcode >= 0; i++) {
+    if (opcode == OpInfo[i].opcode)
+      return OpInfo[i].name;
+  }
+  return "";
+}
+
+static int
+op2arg_type(int opcode)
+{
+  int i;
+
+  for (i = 0; OpInfo[i].opcode >= 0; i++) {
+    if (opcode == OpInfo[i].opcode)
+      return OpInfo[i].arg_type;
+  }
+  return ARG_SPECIAL;
+}
+
+static void
+p_string(FILE* f, int len, UChar* s)
+{
+  fputs(":", f);
+  while (len-- > 0) { fputc(*s++, f); }
+}
+
+static void
+p_len_string(FILE* f, LengthType len, int mb_len, UChar* s)
+{
+  int x = len * mb_len;
+
+  fprintf(f, ":%d:", len);
+  while (x-- > 0) { fputc(*s++, f); }
+}
+
+static void
+p_rel_addr(FILE* f, RelAddrType rel_addr, UChar* p, UChar* start)
+{
+  RelAddrType curr = (RelAddrType )(p - start);
+
+  fprintf(f, "{%d/%d}", rel_addr, curr + rel_addr);
+}
+
+static int
+bitset_on_num(BitSetRef bs)
+{
+  int i, n;
+
+  n = 0;
+  for (i = 0; i < SINGLE_BYTE_SIZE; i++) {
+    if (BITSET_AT(bs, i)) n++;
+  }
+  return n;
+}
+
+extern void
+onig_print_compiled_byte_code(FILE* f, UChar* bp, UChar** nextp, UChar* start,
+                              OnigEncoding enc)
+{
+  int i, n, arg_type;
+  RelAddrType addr;
+  LengthType len;
+  MemNumType mem;
+  OnigCodePoint code;
+  OnigOptionType option;
+  ModeType mode;
+  UChar *q;
+
+  fprintf(f, "%s", op2name(*bp));
+  arg_type = op2arg_type(*bp);
+  if (arg_type != ARG_SPECIAL) {
+    bp++;
+    switch (arg_type) {
+    case ARG_NON:
+      break;
+    case ARG_RELADDR:
+      GET_RELADDR_INC(addr, bp);
+      fputc(':', f);
+      p_rel_addr(f, addr, bp, start);
+      break;
+    case ARG_ABSADDR:
+      GET_ABSADDR_INC(addr, bp);
+      fprintf(f, ":{/%d}", addr);
+      break;
+    case ARG_LENGTH:
+      GET_LENGTH_INC(len, bp);
+      fprintf(f, ":%d", len);
+      break;
+    case ARG_MEMNUM:
+      mem = *((MemNumType* )bp);
+      bp += SIZE_MEMNUM;
+      fprintf(f, ":%d", mem);
+      break;
+    case ARG_OPTION:
+      {
+        OnigOptionType option = *((OnigOptionType* )bp);
+        bp += SIZE_OPTION;
+        fprintf(f, ":%d", option);
+      }
+      break;
+
+    case ARG_MODE:
+      mode = *((ModeType* )bp);
+      bp += SIZE_MODE;
+      fprintf(f, ":%d", mode);
+      break;
+    }
+  }
+  else {
+    switch (*bp++) {
+    case OP_EXACT1:
+    case OP_ANYCHAR_STAR_PEEK_NEXT:
+    case OP_ANYCHAR_ML_STAR_PEEK_NEXT:
+      p_string(f, 1, bp++); break;
+    case OP_EXACT2:
+      p_string(f, 2, bp); bp += 2; break;
+    case OP_EXACT3:
+      p_string(f, 3, bp); bp += 3; break;
+    case OP_EXACT4:
+      p_string(f, 4, bp); bp += 4; break;
+    case OP_EXACT5:
+      p_string(f, 5, bp); bp += 5; break;
+    case OP_EXACTN:
+      GET_LENGTH_INC(len, bp);
+      p_len_string(f, len, 1, bp);
+      bp += len;
+      break;
+
+    case OP_EXACTMB2N1:
+      p_string(f, 2, bp); bp += 2; break;
+    case OP_EXACTMB2N2:
+      p_string(f, 4, bp); bp += 4; break;
+    case OP_EXACTMB2N3:
+      p_string(f, 6, bp); bp += 6; break;
+    case OP_EXACTMB2N:
+      GET_LENGTH_INC(len, bp);
+      p_len_string(f, len, 2, bp);
+      bp += len * 2;
+      break;
+    case OP_EXACTMB3N:
+      GET_LENGTH_INC(len, bp);
+      p_len_string(f, len, 3, bp);
+      bp += len * 3;
+      break;
+    case OP_EXACTMBN:
+      {
+        int mb_len;
+
+        GET_LENGTH_INC(mb_len, bp);
+        GET_LENGTH_INC(len, bp);
+        fprintf(f, ":%d:%d:", mb_len, len);
+        n = len * mb_len;
+        while (n-- > 0) { fputc(*bp++, f); }
+      }
+      break;
+
+    case OP_EXACT1_IC:
+      len = enclen(enc, bp);
+      p_string(f, len, bp);
+      bp += len;
+      break;
+    case OP_EXACTN_IC:
+      GET_LENGTH_INC(len, bp);
+      p_len_string(f, len, 1, bp);
+      bp += len;
+      break;
+
+    case OP_CCLASS:
+      n = bitset_on_num((BitSetRef )bp);
+      bp += SIZE_BITSET;
+      fprintf(f, ":%d", n);
+      break;
+
+    case OP_CCLASS_NOT:
+      n = bitset_on_num((BitSetRef )bp);
+      bp += SIZE_BITSET;
+      fprintf(f, ":%d", n);
+      break;
+
+    case OP_CCLASS_MB:
+    case OP_CCLASS_MB_NOT:
+      GET_LENGTH_INC(len, bp);
+      q = bp;
+#ifndef PLATFORM_UNALIGNED_WORD_ACCESS
+      ALIGNMENT_RIGHT(q);
+#endif
+      GET_CODE_POINT(code, q);
+      bp += len;
+      fprintf(f, ":%d:%d", (int )code, len);
+      break;
+
+    case OP_CCLASS_MIX:
+    case OP_CCLASS_MIX_NOT:
+      n = bitset_on_num((BitSetRef )bp);
+      bp += SIZE_BITSET;
+      GET_LENGTH_INC(len, bp);
+      q = bp;
+#ifndef PLATFORM_UNALIGNED_WORD_ACCESS
+      ALIGNMENT_RIGHT(q);
+#endif
+      GET_CODE_POINT(code, q);
+      bp += len;
+      fprintf(f, ":%d:%d:%d", n, (int )code, len);
+      break;
+
+#ifdef USE_OP_CCLASS_NODE
+    case OP_CCLASS_NODE:
+      {
+        CClassNode *cc;
+
+        GET_POINTER_INC(cc, bp);
+        n = bitset_on_num(cc->bs);
+        fprintf(f, ":%p:%d", cc, n);
+      }
+      break;
+#endif
+
+    case OP_BACKREF_N_IC:
+      mem = *((MemNumType* )bp);
+      bp += SIZE_MEMNUM;
+      fprintf(f, ":%d", mem);
+      break;
+
+    case OP_BACKREF_MULTI_IC:
+    case OP_BACKREF_MULTI:
+    case OP_BACKREF_CHECK:
+      fputs(" ", f);
+      GET_LENGTH_INC(len, bp);
+      for (i = 0; i < len; i++) {
+        GET_MEMNUM_INC(mem, bp);
+        if (i > 0) fputs(", ", f);
+        fprintf(f, "%d", mem);
+      }
+      break;
+
+    case OP_BACKREF_WITH_LEVEL:
+      GET_OPTION_INC(option, bp);
+      fprintf(f, ":%d", option);
+      /* fall */
+    case OP_BACKREF_CHECK_WITH_LEVEL:
+      {
+        LengthType level;
+
+        GET_LENGTH_INC(level, bp);
+        fprintf(f, ":%d", level);
+
+        fputs(" ", f);
+        GET_LENGTH_INC(len, bp);
+        for (i = 0; i < len; i++) {
+          GET_MEMNUM_INC(mem, bp);
+          if (i > 0) fputs(", ", f);
+          fprintf(f, "%d", mem);
+        }
+      }
+      break;
+
+    case OP_REPEAT:
+    case OP_REPEAT_NG:
+      {
+        mem = *((MemNumType* )bp);
+        bp += SIZE_MEMNUM;
+        addr = *((RelAddrType* )bp);
+        bp += SIZE_RELADDR;
+        fprintf(f, ":%d:%d", mem, addr);
+      }
+      break;
+
+    case OP_PUSH_OR_JUMP_EXACT1:
+    case OP_PUSH_IF_PEEK_NEXT:
+      addr = *((RelAddrType* )bp);
+      bp += SIZE_RELADDR;
+      fputc(':', f);
+      p_rel_addr(f, addr, bp, start);
+      p_string(f, 1, bp);
+      bp += 1;
+      break;
+
+    case OP_LOOK_BEHIND:
+      GET_LENGTH_INC(len, bp);
+      fprintf(f, ":%d", len);
+      break;
+
+    case OP_LOOK_BEHIND_NOT_START:
+      GET_RELADDR_INC(addr, bp);
+      GET_LENGTH_INC(len, bp);
+      fprintf(f, ":%d:", len);
+      p_rel_addr(f, addr, bp, start);
+      break;
+
+    case OP_PUSH_SAVE_VAL:
+      {
+        SaveType type;
+        GET_SAVE_TYPE_INC(type, bp);
+        GET_MEMNUM_INC(mem, bp);
+        fprintf(f, ":%d:%d", type, mem);
+      }
+      break;
+
+    case OP_UPDATE_VAR:
+      {
+        UpdateVarType type;
+        GET_UPDATE_VAR_TYPE_INC(type, bp);
+        GET_MEMNUM_INC(mem, bp);
+        fprintf(f, ":%d:%d", type, mem);
+      }
+      break;
+
+#ifdef USE_CALLOUT
+    case OP_CALLOUT_CONTENTS:
+      {
+        GET_MEMNUM_INC(mem,  bp); // number
+        fprintf(f, ":%d", mem);
+      }
+      break;
+
+    case OP_CALLOUT_NAME:
+      {
+        int id;
+
+        GET_MEMNUM_INC(id,   bp); // id
+        GET_MEMNUM_INC(mem,  bp); // number
+
+        fprintf(f, ":%d:%d", id, mem);
+      }
+      break;
+#endif
+
+    default:
+      fprintf(stderr, "onig_print_compiled_byte_code: undefined code %d\n", *--bp);
+    }
+  }
+  if (nextp) *nextp = bp;
+}
+#endif /* ONIG_DEBUG */
+
+#ifdef ONIG_DEBUG_COMPILE
+extern void
+onig_print_compiled_byte_code_list(FILE* f, regex_t* reg)
+{
+  UChar* bp;
+  UChar* start = reg->p;
+  UChar* end   = reg->p + reg->used;
+
+  fprintf(f, "bt_mem_start: 0x%x, bt_mem_end: 0x%x\n",
+          reg->bt_mem_start, reg->bt_mem_end);
+  fprintf(f, "code-length: %d\n", reg->used);
+
+  bp = start;
+  while (bp < end) {
+    int pos = bp - start;
+
+    fprintf(f, "%4d: ", pos);
+    onig_print_compiled_byte_code(f, bp, &bp, start, reg->enc);
+    fprintf(f, "\n");
+  }
+  fprintf(f, "\n");
+}
+#endif
+
+
 #ifdef USE_CAPTURE_HISTORY
 static void history_tree_free(OnigCaptureTreeNode* node);
 
@@ -304,6 +860,45 @@ onig_region_copy(OnigRegion* to, OnigRegion* from)
 #endif
 }
 
+#ifdef USE_CALLOUT
+#define CALLOUT_BODY(func, ain, aname_id, anum, user, args, result) do { \
+  args.in            = (ain);\
+  args.name_id       = (aname_id);\
+  args.num           = anum;\
+  args.regex         = reg;\
+  args.string        = str;\
+  args.string_end    = end;\
+  args.start         = sstart;\
+  args.right_range   = right_range;\
+  args.current       = s;\
+  args.retry_in_match_counter = retry_in_match_counter;\
+  args.msa           = msa;\
+  args.stk_base      = stk_base;\
+  args.stk           = stk;\
+  args.mem_start_stk = mem_start_stk;\
+  args.mem_end_stk   = mem_end_stk;\
+  result = (func)(&args, user);\
+} while (0)
+
+#define RETRACTION_CALLOUT(func, aname_id, anum, user) do {\
+  int result;\
+  OnigCalloutArgs args;\
+  CALLOUT_BODY(func, ONIG_CALLOUT_IN_RETRACTION, aname_id, anum, user, args, result);\
+  switch (result) {\
+  case ONIG_CALLOUT_FAIL:\
+  case ONIG_CALLOUT_SUCCESS:\
+    break;\
+  default:\
+    if (result > 0) {\
+      result = ONIGERR_INVALID_ARGUMENT;\
+    }\
+    best_len = result;\
+    goto finish;\
+    break;\
+  }\
+} while(0)
+#endif
+
 
 /** stack **/
 #define INVALID_STACK_INDEX   -1
@@ -316,40 +911,43 @@ onig_region_copy(OnigRegion* to, OnigRegion* from)
 #define STK_ALT                   (0x0002 | STK_ALT_FLAG)
 #define STK_ALT_PREC_READ_NOT     (0x0004 | STK_ALT_FLAG)
 #define STK_ALT_LOOK_BEHIND_NOT   (0x0006 | STK_ALT_FLAG)
+
 /* handled by normal-POP */
-#define STK_MEM_START              0x0100
-#define STK_MEM_END                0x8200
-#define STK_REPEAT_INC             0x0300
-#define STK_STATE_CHECK_MARK       0x1000
+#define STK_MEM_START              0x0010
+#define STK_MEM_END                0x8030
+#define STK_REPEAT_INC             0x0050
+#ifdef USE_CALLOUT
+#define STK_CALLOUT                0x0070
+#endif
+
 /* avoided by normal-POP */
 #define STK_VOID                   0x0000  /* for fill a blank */
 #define STK_EMPTY_CHECK_START      0x3000
 #define STK_EMPTY_CHECK_END        0x5000  /* for recursive call */
-#define STK_MEM_END_MARK           0x8400
-#define STK_TO_VOID_START          0x0500  /* mark for "(?>...)" */
-#define STK_REPEAT                 0x0600
-#define STK_CALL_FRAME             0x0700
-#define STK_RETURN                 0x0800
-#define STK_SAVE_VAL               0x0900
+#define STK_MEM_END_MARK           0x8100
+#define STK_TO_VOID_START          0x1200  /* mark for "(?>...)" */
+#define STK_REPEAT                 0x0300
+#define STK_CALL_FRAME             0x0400
+#define STK_RETURN                 0x0500
+#define STK_SAVE_VAL               0x0600
 
 /* stack type check mask */
 #define STK_MASK_POP_USED          STK_ALT_FLAG
-#define STK_MASK_TO_VOID_TARGET    0x10fe
+#define STK_MASK_POP_HANDLED       0x0010
+#define STK_MASK_POP_HANDLED_TIL   (STK_MASK_POP_HANDLED | 0x0004)
+#define STK_MASK_TO_VOID_TARGET    0x100e
 #define STK_MASK_MEM_END_OR_MARK   0x8000  /* MEM_END or MEM_END_MARK */
 
 typedef intptr_t StackIndex;
 
 typedef struct _StackType {
   unsigned int type;
-  int id;
+  int zid;
   union {
     struct {
       UChar *pcode;      /* byte code position */
       UChar *pstr;       /* string position */
       UChar *pstr_prev;  /* previous char position of pstr */
-#ifdef USE_COMBINATION_EXPLOSION_CHECK
-      unsigned int state_check;
-#endif
     } state;
     struct {
       int   count;       /* for OP_REPEAT_INC, OP_REPEAT_INC_NG */
@@ -378,67 +976,66 @@ typedef struct _StackType {
       UChar* v;
       UChar* v2;
     } val;
+#ifdef USE_CALLOUT
+    struct {
+      int num;
+      OnigCalloutFunc func;
+    } callout;
+#endif
   } u;
 } StackType;
 
+#ifdef USE_CALLOUT
+
+struct OnigCalloutArgsStruct {
+  OnigCalloutIn    in;
+  int              name_id;   /* name id or ONIG_NON_NAME_ID */
+  int              num;
+  OnigRegex        regex;
+  const OnigUChar* string;
+  const OnigUChar* string_end;
+  const OnigUChar* start;
+  const OnigUChar* right_range;
+  const OnigUChar* current;  // current matching position
+  unsigned long    retry_in_match_counter;
+
+  /* invisible to users */
+  MatchArg*   msa;
+  StackType*  stk_base;
+  StackType*  stk;
+  StackIndex* mem_start_stk;
+  StackIndex* mem_end_stk;
+};
+
+#endif
+
 
 #ifdef USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE
-#define MATCH_ARG_INIT(msa, reg, arg_option, arg_region, arg_start) do {\
+#define MATCH_ARG_INIT(msa, reg, arg_option, arg_region, arg_start, mp) do { \
   (msa).stack_p  = (void* )0;\
   (msa).options  = (arg_option);\
   (msa).region   = (arg_region);\
   (msa).start    = (arg_start);\
+  (msa).match_stack_limit  = (mp)->match_stack_limit;\
+  (msa).retry_limit_in_match = (mp)->retry_limit_in_match;\
+  (msa).mp = mp;\
   (msa).best_len = ONIG_MISMATCH;\
   (msa).ptr_num  = (reg)->num_repeat + ((reg)->num_mem + 1) * 2; \
 } while(0)
 #else
-#define MATCH_ARG_INIT(msa, reg, arg_option, arg_region, arg_start) do {\
+#define MATCH_ARG_INIT(msa, reg, arg_option, arg_region, arg_start, mp) do { \
   (msa).stack_p  = (void* )0;\
   (msa).options  = (arg_option);\
   (msa).region   = (arg_region);\
   (msa).start    = (arg_start);\
+  (msa).match_stack_limit  = (mp)->match_stack_limit;\
+  (msa).retry_limit_in_match = (mp)->retry_limit_in_match;\
+  (msa).mp = mp;\
   (msa).ptr_num  = (reg)->num_repeat + ((reg)->num_mem + 1) * 2; \
 } while(0)
 #endif
 
-#ifdef USE_COMBINATION_EXPLOSION_CHECK
-
-#define STATE_CHECK_BUFF_MALLOC_THRESHOLD_SIZE  16
-
-#define STATE_CHECK_BUFF_INIT(msa, str_len, offset, state_num) do {\
-  if ((state_num) > 0 && str_len >= STATE_CHECK_STRING_THRESHOLD_LEN) {\
-    unsigned int size = (unsigned int )(((str_len) + 1) * (state_num) + 7) >> 3;\
-    offset = ((offset) * (state_num)) >> 3;\
-    if (size > 0 && offset < size && size < STATE_CHECK_BUFF_MAX_SIZE) {\
-      if (size >= STATE_CHECK_BUFF_MALLOC_THRESHOLD_SIZE) \
-        (msa).state_check_buff = (void* )xmalloc(size);\
-      else \
-        (msa).state_check_buff = (void* )xalloca(size);\
-      xmemset(((char* )((msa).state_check_buff)+(offset)), 0, \
-              (size_t )(size - (offset))); \
-      (msa).state_check_buff_size = size;\
-    }\
-    else {\
-      (msa).state_check_buff = (void* )0;\
-      (msa).state_check_buff_size = 0;\
-    }\
-  }\
-  else {\
-    (msa).state_check_buff = (void* )0;\
-    (msa).state_check_buff_size = 0;\
-  }\
-} while(0)
-
-#define MATCH_ARG_FREE(msa) do {\
-  if ((msa).stack_p) xfree((msa).stack_p);\
-  if ((msa).state_check_buff_size >= STATE_CHECK_BUFF_MALLOC_THRESHOLD_SIZE) { \
-    if ((msa).state_check_buff) xfree((msa).state_check_buff);\
-  }\
-} while(0)
-#else
-#define STATE_CHECK_BUFF_INIT(msa, str_len, offset, state_num)
 #define MATCH_ARG_FREE(msa)  if ((msa).stack_p) xfree((msa).stack_p)
-#endif
 
 
 #define ALLOCA_PTR_NUM_LIMIT   50
@@ -495,25 +1092,303 @@ typedef struct _StackType {
   mem_end_stk   = mem_start_stk + num_mem + 1;\
 } while(0)
 
-static unsigned int MatchStackLimitSize = DEFAULT_MATCH_STACK_LIMIT_SIZE;
+static unsigned int MatchStackLimit = DEFAULT_MATCH_STACK_LIMIT_SIZE;
 
 extern unsigned int
 onig_get_match_stack_limit_size(void)
 {
-  return MatchStackLimitSize;
+  return MatchStackLimit;
 }
 
 extern int
 onig_set_match_stack_limit_size(unsigned int size)
 {
-  MatchStackLimitSize = size;
+  MatchStackLimit = size;
   return 0;
 }
 
+#ifdef USE_RETRY_LIMIT_IN_MATCH
+
+static unsigned long RetryLimitInMatch = DEFAULT_RETRY_LIMIT_IN_MATCH;
+
+#define CHECK_RETRY_LIMIT_IN_MATCH  do {\
+  if (retry_in_match_counter++ > retry_limit_in_match) goto retry_limit_in_match_over;\
+} while (0)
+
+#else
+
+#define CHECK_RETRY_LIMIT_IN_MATCH
+
+#endif /* USE_RETRY_LIMIT_IN_MATCH */
+
+extern unsigned long
+onig_get_retry_limit_in_match(void)
+{
+#ifdef USE_RETRY_LIMIT_IN_MATCH
+  return RetryLimitInMatch;
+#else
+  //return ONIG_NO_SUPPORT_CONFIG;
+  return 0;
+#endif
+}
+
+extern int
+onig_set_retry_limit_in_match(unsigned long size)
+{
+#ifdef USE_RETRY_LIMIT_IN_MATCH
+  RetryLimitInMatch = size;
+  return 0;
+#else
+  return ONIG_NO_SUPPORT_CONFIG;
+#endif
+}
+
+static OnigCalloutFunc DefaultProgressCallout;
+static OnigCalloutFunc DefaultRetractionCallout;
+
+extern OnigMatchParam*
+onig_new_match_param(void)
+{
+  OnigMatchParam* p;
+
+  p = (OnigMatchParam* )xmalloc(sizeof(*p));
+  if (IS_NOT_NULL(p)) {
+    onig_initialize_match_param(p);
+  }
+
+  return p;
+}
+
+extern void
+onig_free_match_param_content(OnigMatchParam* p)
+{
+#ifdef USE_CALLOUT
+  if (IS_NOT_NULL(p->callout_data)) {
+    xfree(p->callout_data);
+    p->callout_data = 0;
+  }
+#endif
+}
+
+extern void
+onig_free_match_param(OnigMatchParam* p)
+{
+  if (IS_NOT_NULL(p)) {
+    onig_free_match_param_content(p);
+    xfree(p);
+  }
+}
+
+extern int
+onig_initialize_match_param(OnigMatchParam* mp)
+{
+  mp->match_stack_limit  = MatchStackLimit;
+#ifdef USE_RETRY_LIMIT_IN_MATCH
+  mp->retry_limit_in_match = RetryLimitInMatch;
+#endif
+  mp->progress_callout_of_contents   = DefaultProgressCallout;
+  mp->retraction_callout_of_contents = DefaultRetractionCallout;
+
+#ifdef USE_CALLOUT
+  mp->match_at_call_counter  = 0;
+  mp->callout_user_data      = 0;
+  mp->callout_data           = 0;
+  mp->callout_data_alloc_num = 0;
+#endif
+
+  return ONIG_NORMAL;
+}
+
+#ifdef USE_CALLOUT
+
+static int
+adjust_match_param(regex_t* reg, OnigMatchParam* mp)
+{
+  RegexExt* ext = REG_EXTP(reg);
+
+  mp->match_at_call_counter = 0;
+
+  if (IS_NULL(ext) || ext->callout_num == 0) return ONIG_NORMAL;
+
+  if (ext->callout_num > mp->callout_data_alloc_num) {
+    CalloutData* d;
+    size_t n = ext->callout_num * sizeof(*d);
+    if (IS_NOT_NULL(mp->callout_data))
+      d = (CalloutData* )xrealloc(mp->callout_data, n);
+    else
+      d = (CalloutData* )xmalloc(n);
+    CHECK_NULL_RETURN_MEMERR(d);
+
+    mp->callout_data = d;
+    mp->callout_data_alloc_num = ext->callout_num;
+  }
+
+  xmemset(mp->callout_data, 0, mp->callout_data_alloc_num * sizeof(CalloutData));
+  return ONIG_NORMAL;
+}
+
+#define ADJUST_MATCH_PARAM(reg, mp) \
+  r = adjust_match_param(reg, mp);\
+  if (r != ONIG_NORMAL) return r;
+
+#define CALLOUT_DATA_AT_NUM(mp, num)  ((mp)->callout_data + ((num) - 1))
+
+extern int
+onig_check_callout_data_and_clear_old_values(OnigCalloutArgs* args)
+{
+  OnigMatchParam* mp;
+  int num;
+  CalloutData* d;
+
+  mp  = args->msa->mp;
+  num = args->num;
+
+  d = CALLOUT_DATA_AT_NUM(mp, num);
+  if (d->last_match_at_call_counter != mp->match_at_call_counter) {
+    xmemset(d, 0, sizeof(*d));
+    d->last_match_at_call_counter = mp->match_at_call_counter;
+    return d->last_match_at_call_counter;
+  }
+
+  return 0;
+}
+
+extern int
+onig_get_callout_data_dont_clear_old(regex_t* reg, OnigMatchParam* mp,
+                                     int callout_num, int slot,
+                                     OnigType* type, OnigValue* val)
+{
+  OnigType t;
+  CalloutData* d;
+
+  if (callout_num <= 0) return ONIGERR_INVALID_ARGUMENT;
+
+  d = CALLOUT_DATA_AT_NUM(mp, callout_num);
+  t = d->slot[slot].type;
+  if (IS_NOT_NULL(type)) *type = t;
+  if (IS_NOT_NULL(val))  *val  = d->slot[slot].val;
+  return (t == ONIG_TYPE_VOID ? 1 : ONIG_NORMAL);
+}
+
+extern int
+onig_get_callout_data_by_callout_args_self_dont_clear_old(OnigCalloutArgs* args,
+                                                          int slot, OnigType* type,
+                                                          OnigValue* val)
+{
+  return onig_get_callout_data_dont_clear_old(args->regex, args->msa->mp,
+                                              args->num, slot, type, val);
+}
+
+extern int
+onig_get_callout_data(regex_t* reg, OnigMatchParam* mp,
+                      int callout_num, int slot,
+                      OnigType* type, OnigValue* val)
+{
+  OnigType t;
+  CalloutData* d;
+
+  if (callout_num <= 0) return ONIGERR_INVALID_ARGUMENT;
+
+  d = CALLOUT_DATA_AT_NUM(mp, callout_num);
+  if (d->last_match_at_call_counter != mp->match_at_call_counter) {
+    xmemset(d, 0, sizeof(*d));
+    d->last_match_at_call_counter = mp->match_at_call_counter;
+  }
+
+  t = d->slot[slot].type;
+  if (IS_NOT_NULL(type)) *type = t;
+  if (IS_NOT_NULL(val))  *val  = d->slot[slot].val;
+  return (t == ONIG_TYPE_VOID ? 1 : ONIG_NORMAL);
+}
+
+extern int
+onig_get_callout_data_by_tag(regex_t* reg, OnigMatchParam* mp,
+                             const UChar* tag, const UChar* tag_end, int slot,
+                             OnigType* type, OnigValue* val)
+{
+  int num;
+
+  num = onig_get_callout_num_by_tag(reg, tag, tag_end);
+  if (num < 0)  return num;
+  if (num == 0) return ONIGERR_INVALID_CALLOUT_TAG_NAME;
+
+  return onig_get_callout_data(reg, mp, num, slot, type, val);
+}
+
+extern int
+onig_get_callout_data_by_callout_args(OnigCalloutArgs* args,
+                                      int callout_num, int slot,
+                                      OnigType* type, OnigValue* val)
+{
+  return onig_get_callout_data(args->regex, args->msa->mp, callout_num, slot,
+                               type, val);
+}
+
+extern int
+onig_get_callout_data_by_callout_args_self(OnigCalloutArgs* args,
+                                           int slot, OnigType* type, OnigValue* val)
+{
+  return onig_get_callout_data(args->regex, args->msa->mp, args->num, slot,
+                               type, val);
+}
+
+extern int
+onig_set_callout_data(regex_t* reg, OnigMatchParam* mp,
+                      int callout_num, int slot,
+                      OnigType type, OnigValue* val)
+{
+  CalloutData* d;
+
+  if (callout_num <= 0) return ONIGERR_INVALID_ARGUMENT;
+
+  d = CALLOUT_DATA_AT_NUM(mp, callout_num);
+  d->slot[slot].type = type;
+  d->slot[slot].val  = *val;
+  d->last_match_at_call_counter = mp->match_at_call_counter;
+
+  return ONIG_NORMAL;
+}
+
+extern int
+onig_set_callout_data_by_tag(regex_t* reg, OnigMatchParam* mp,
+                             const UChar* tag, const UChar* tag_end, int slot,
+                             OnigType type, OnigValue* val)
+{
+  int num;
+
+  num = onig_get_callout_num_by_tag(reg, tag, tag_end);
+  if (num < 0)  return num;
+  if (num == 0) return ONIGERR_INVALID_CALLOUT_TAG_NAME;
+
+  return onig_set_callout_data(reg, mp, num, slot, type, val);
+}
+
+extern int
+onig_set_callout_data_by_callout_args(OnigCalloutArgs* args,
+                                      int callout_num, int slot,
+                                      OnigType type, OnigValue* val)
+{
+  return onig_set_callout_data(args->regex, args->msa->mp, callout_num, slot,
+                               type, val);
+}
+
+extern int
+onig_set_callout_data_by_callout_args_self(OnigCalloutArgs* args,
+                                           int slot, OnigType type, OnigValue* val)
+{
+  return onig_set_callout_data(args->regex, args->msa->mp, args->num, slot,
+                               type, val);
+}
+
+#else
+#define ADJUST_MATCH_PARAM(reg, mp)
+#endif /* USE_CALLOUT */
+
+
 static int
 stack_double(int is_alloca, char** arg_alloc_base,
              StackType** arg_stk_base, StackType** arg_stk_end, StackType** arg_stk,
-             OnigMatchArg* msa)
+             MatchArg* msa)
 {
   unsigned int n;
   int used;
@@ -541,11 +1416,11 @@ stack_double(int is_alloca, char** arg_alloc_base,
     xmemcpy(new_alloc_base, alloc_base, size);
   }
   else {
-    if (MatchStackLimitSize != 0 && n > MatchStackLimitSize) {
-      if ((unsigned int )(stk_end - stk_base) == MatchStackLimitSize)
+    if (msa->match_stack_limit != 0 && n > msa->match_stack_limit) {
+      if ((unsigned int )(stk_end - stk_base) == msa->match_stack_limit)
         return ONIGERR_MATCH_STACK_LIMIT_OVER;
       else
-        n = MatchStackLimitSize;
+        n = msa->match_stack_limit;
     }
     new_alloc_base = (char* )xrealloc(alloc_base, new_size);
     if (IS_NULL(new_alloc_base)) {
@@ -584,80 +1459,36 @@ stack_double(int is_alloca, char** arg_alloc_base,
 
 #define IS_TO_VOID_TARGET(stk) (((stk)->type & STK_MASK_TO_VOID_TARGET) != 0)
 
-#ifdef USE_COMBINATION_EXPLOSION_CHECK
-#define STATE_CHECK_POS(s,snum) \
-  (((s) - str) * num_comb_exp_check + ((snum) - 1))
-#define STATE_CHECK_VAL(v,snum) do {\
-  if (IS_NOT_NULL(state_check_buff)) {\
-    int x = STATE_CHECK_POS(s,snum);\
-    (v) = state_check_buff[x/8] & (1<<(x%8));\
-  }\
-  else (v) = 0;\
-} while(0)
-
-
-#define ELSE_IF_STATE_CHECK_MARK(stk) \
-  else if ((stk)->type == STK_STATE_CHECK_MARK) { \
-    int x = STATE_CHECK_POS(stk->u.state.pstr, stk->u.state.state_check);\
-    state_check_buff[x/8] |= (1<<(x%8));\
-  }
-
 #define STACK_PUSH(stack_type,pat,s,sprev) do {\
   STACK_ENSURE(1);\
   stk->type = (stack_type);\
   stk->u.state.pcode     = (pat);\
   stk->u.state.pstr      = (s);\
   stk->u.state.pstr_prev = (sprev);\
-  stk->u.state.state_check = 0;\
   STACK_INC;\
 } while(0)
 
 #define STACK_PUSH_ENSURED(stack_type,pat) do {\
   stk->type = (stack_type);\
   stk->u.state.pcode = (pat);\
-  stk->u.state.state_check = 0;\
-  STACK_INC;\
-} while(0)
-
-#define STACK_PUSH_ALT_WITH_STATE_CHECK(pat,s,sprev,snum) do {\
-  STACK_ENSURE(1);\
-  stk->type = STK_ALT;\
-  stk->u.state.pcode     = (pat);\
-  stk->u.state.pstr      = (s);\
-  stk->u.state.pstr_prev = (sprev);\
-  stk->u.state.state_check = (IS_NOT_NULL(state_check_buff) ? (snum) : 0);\
   STACK_INC;\
 } while(0)
 
-#define STACK_PUSH_STATE_CHECK(s,snum) do {\
-  if (IS_NOT_NULL(state_check_buff)) {   \
-    STACK_ENSURE(1);\
-    stk->type = STK_STATE_CHECK_MARK;\
-    stk->u.state.pstr = (s);\
-    stk->u.state.state_check = (snum);\
-    STACK_INC;\
-  }\
-} while(0)
-
-#else /* USE_COMBINATION_EXPLOSION_CHECK */
-
-#define ELSE_IF_STATE_CHECK_MARK(stk)
-
-#define STACK_PUSH(stack_type,pat,s,sprev) do {\
-  STACK_ENSURE(1);\
+#ifdef ONIG_DEBUG_MATCH
+#define STACK_PUSH_BOTTOM(stack_type,pat) do {\
   stk->type = (stack_type);\
-  stk->u.state.pcode     = (pat);\
-  stk->u.state.pstr      = (s);\
-  stk->u.state.pstr_prev = (sprev);\
+  stk->u.state.pcode = (pat);\
+  stk->u.state.pstr      = s;\
+  stk->u.state.pstr_prev = sprev;\
   STACK_INC;\
-} while(0)
-
-#define STACK_PUSH_ENSURED(stack_type,pat) do {\
+} while (0)
+#else
+#define STACK_PUSH_BOTTOM(stack_type,pat) do {\
   stk->type = (stack_type);\
   stk->u.state.pcode = (pat);\
   STACK_INC;\
-} while(0)
-#endif /* USE_COMBINATION_EXPLOSION_CHECK */
+} while (0)
+#endif
 
 #define STACK_PUSH_ALT(pat,s,sprev)       STACK_PUSH(STK_ALT,pat,s,sprev)
 #define STACK_PUSH_SUPER_ALT(pat,s,sprev) STACK_PUSH(STK_SUPER_ALT,pat,s,sprev)
@@ -672,7 +1503,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
 #define STACK_PUSH_REPEAT(sid, pat) do {\
   STACK_ENSURE(1);\
   stk->type = STK_REPEAT;\
-  stk->id   = (sid);\
+  stk->zid  = (sid);\
   stk->u.repeat.pcode  = (pat);\
   stk->u.repeat.count  = 0;\
   STACK_INC;\
@@ -688,7 +1519,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
 #define STACK_PUSH_MEM_START(mnum, s) do {\
   STACK_ENSURE(1);\
   stk->type = STK_MEM_START;\
-  stk->id   = (mnum);\
+  stk->zid  = (mnum);\
   stk->u.mem.pstr     = (s);\
   stk->u.mem.start    = mem_start_stk[mnum];\
   stk->u.mem.end      = mem_end_stk[mnum];\
@@ -700,7 +1531,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
 #define STACK_PUSH_MEM_END(mnum, s) do {\
   STACK_ENSURE(1);\
   stk->type = STK_MEM_END;\
-  stk->id   = (mnum);\
+  stk->zid  = (mnum);\
   stk->u.mem.pstr   = (s);\
   stk->u.mem.start  = mem_start_stk[mnum];\
   stk->u.mem.end    = mem_end_stk[mnum];\
@@ -711,7 +1542,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
 #define STACK_PUSH_MEM_END_MARK(mnum) do {\
   STACK_ENSURE(1);\
   stk->type = STK_MEM_END_MARK;\
-  stk->id   = (mnum);\
+  stk->zid  = (mnum);\
   STACK_INC;\
 } while(0)
 
@@ -721,10 +1552,10 @@ stack_double(int is_alloca, char** arg_alloc_base,
   while (k > stk_base) {\
     k--;\
     if ((k->type & STK_MASK_MEM_END_OR_MARK) != 0 \
-      && k->id == (mnum)) {\
+      && k->zid == (mnum)) {\
       level++;\
     }\
-    else if (k->type == STK_MEM_START && k->id == (mnum)) {\
+    else if (k->type == STK_MEM_START && k->zid == (mnum)) {\
       if (level == 0) break;\
       level--;\
     }\
@@ -752,7 +1583,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
 #define STACK_PUSH_EMPTY_CHECK_START(cnum, s) do {\
   STACK_ENSURE(1);\
   stk->type = STK_EMPTY_CHECK_START;\
-  stk->id   = (cnum);\
+  stk->zid  = (cnum);\
   stk->u.empty_check.pstr = (s);\
   STACK_INC;\
 } while(0)
@@ -760,7 +1591,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
 #define STACK_PUSH_EMPTY_CHECK_END(cnum) do {\
   STACK_ENSURE(1);\
   stk->type = STK_EMPTY_CHECK_END;\
-  stk->id   = (cnum);\
+  stk->zid  = (cnum);\
   STACK_INC;\
 } while(0)
 
@@ -780,7 +1611,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
 #define STACK_PUSH_SAVE_VAL(sid, stype, sval) do {\
   STACK_ENSURE(1);\
   stk->type = STK_SAVE_VAL;\
-  stk->id   = (sid);\
+  stk->zid  = (sid);\
   stk->u.val.type = (stype);\
   stk->u.val.v    = (UChar* )(sval);\
   STACK_INC;\
@@ -789,7 +1620,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
 #define STACK_PUSH_SAVE_VAL_WITH_SPREV(sid, stype, sval) do {\
   STACK_ENSURE(1);\
   stk->type = STK_SAVE_VAL;\
-  stk->id   = (sid);\
+  stk->zid  = (sid);\
   stk->u.val.type = (stype);\
   stk->u.val.v    = (UChar* )(sval);\
   stk->u.val.v2   = sprev;\
@@ -815,7 +1646,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
     k--;\
     STACK_BASE_CHECK(k, "STACK_GET_SAVE_VAL_TYPE_LAST_ID"); \
     if (k->type == STK_SAVE_VAL && k->u.val.type == (stype)\
-        && k->id == (sid)) {\
+        && k->zid == (sid)) {\
       if (level == 0) {\
         (sval) = k->u.val.v;\
         break;\
@@ -835,7 +1666,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
     k--;\
     STACK_BASE_CHECK(k, "STACK_GET_SAVE_VAL_TYPE_LAST_ID"); \
     if (k->type == STK_SAVE_VAL && k->u.val.type == (stype)\
-        && k->id == (sid)) {\
+        && k->zid == (sid)) {\
       if (level == 0) {\
         (sval) = k->u.val.v;\
         sprev  = k->u.val.v2;\
@@ -869,6 +1700,24 @@ stack_double(int is_alloca, char** arg_alloc_base,
   }\
 } while (0)
 
+#define STACK_PUSH_CALLOUT_CONTENTS(anum, func) do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_CALLOUT;\
+  stk->zid  = ONIG_NON_NAME_ID;\
+  stk->u.callout.num = (anum);\
+  stk->u.callout.func = (func);\
+  STACK_INC;\
+} while(0)
+
+#define STACK_PUSH_CALLOUT_NAME(aid, anum, func) do {\
+  STACK_ENSURE(1);\
+  stk->type = STK_CALLOUT;\
+  stk->zid  = (aid);\
+  stk->u.callout.num = (anum);\
+  stk->u.callout.func = (func);\
+  STACK_INC;\
+} while(0)
+
 #ifdef ONIG_DEBUG
 #define STACK_BASE_CHECK(p, at) \
   if ((p) < stk_base) {\
@@ -884,6 +1733,16 @@ stack_double(int is_alloca, char** arg_alloc_base,
   STACK_BASE_CHECK(stk, "STACK_POP_ONE"); \
 } while(0)
 
+
+#ifdef USE_CALLOUT
+#define POP_CALLOUT_CASE \
+  else if (stk->type == STK_CALLOUT) {\
+    RETRACTION_CALLOUT(stk->u.callout.func, stk->zid, stk->u.callout.num, msa->mp->callout_user_data);\
+  }
+#else
+#define POP_CALLOUT_CASE
+#endif
+
 #define STACK_POP  do {\
   switch (pop_level) {\
   case STACK_POP_LEVEL_FREE:\
@@ -891,7 +1750,6 @@ stack_double(int is_alloca, char** arg_alloc_base,
       stk--;\
       STACK_BASE_CHECK(stk, "STACK_POP"); \
       if ((stk->type & STK_MASK_POP_USED) != 0)  break;\
-      ELSE_IF_STATE_CHECK_MARK(stk);\
     }\
     break;\
   case STACK_POP_LEVEL_MEM_START:\
@@ -900,10 +1758,9 @@ stack_double(int is_alloca, char** arg_alloc_base,
       STACK_BASE_CHECK(stk, "STACK_POP 2"); \
       if ((stk->type & STK_MASK_POP_USED) != 0)  break;\
       else if (stk->type == STK_MEM_START) {\
-        mem_start_stk[stk->id] = stk->u.mem.start;\
-        mem_end_stk[stk->id]   = stk->u.mem.end;\
+        mem_start_stk[stk->zid] = stk->u.mem.start;\
+        mem_end_stk[stk->zid]   = stk->u.mem.end;\
       }\
-      ELSE_IF_STATE_CHECK_MARK(stk);\
     }\
     break;\
   default:\
@@ -911,75 +1768,70 @@ stack_double(int is_alloca, char** arg_alloc_base,
       stk--;\
       STACK_BASE_CHECK(stk, "STACK_POP 3"); \
       if ((stk->type & STK_MASK_POP_USED) != 0)  break;\
-      else if (stk->type == STK_MEM_START) {\
-        mem_start_stk[stk->id] = stk->u.mem.start;\
-        mem_end_stk[stk->id]   = stk->u.mem.end;\
-      }\
-      else if (stk->type == STK_REPEAT_INC) {\
-        STACK_AT(stk->u.repeat_inc.si)->u.repeat.count--;\
-      }\
-      else if (stk->type == STK_MEM_END) {\
-        mem_start_stk[stk->id] = stk->u.mem.start;\
-        mem_end_stk[stk->id]   = stk->u.mem.end;\
+      else if ((stk->type & STK_MASK_POP_HANDLED) != 0) {\
+        if (stk->type == STK_MEM_START) {\
+          mem_start_stk[stk->zid] = stk->u.mem.start;\
+          mem_end_stk[stk->zid]   = stk->u.mem.end;\
+        }\
+        else if (stk->type == STK_REPEAT_INC) {\
+          STACK_AT(stk->u.repeat_inc.si)->u.repeat.count--;\
+        }\
+        else if (stk->type == STK_MEM_END) {\
+          mem_start_stk[stk->zid] = stk->u.mem.start;\
+          mem_end_stk[stk->zid]   = stk->u.mem.end;\
+        }\
+        POP_CALLOUT_CASE\
       }\
-      ELSE_IF_STATE_CHECK_MARK(stk);\
     }\
     break;\
   }\
 } while(0)
 
-#define STACK_POP_TIL_ALT_PREC_READ_NOT  do {\
+#define POP_TIL_BODY(aname, til_type) do {\
   while (1) {\
     stk--;\
-    STACK_BASE_CHECK(stk, "STACK_POP_TIL_ALT_PREC_READ_NOT"); \
-    if (stk->type == STK_ALT_PREC_READ_NOT) break;\
-    else if (stk->type == STK_MEM_START) {\
-      mem_start_stk[stk->id] = stk->u.mem.start;\
-      mem_end_stk[stk->id]   = stk->u.mem.end;\
-    }\
-    else if (stk->type == STK_REPEAT_INC) {\
-      STACK_AT(stk->u.repeat_inc.si)->u.repeat.count--;\
-    }\
-    else if (stk->type == STK_MEM_END) {\
-      mem_start_stk[stk->id] = stk->u.mem.start;\
-      mem_end_stk[stk->id]   = stk->u.mem.end;\
+    STACK_BASE_CHECK(stk, (aname));\
+    if ((stk->type & STK_MASK_POP_HANDLED_TIL) != 0) {\
+      if (stk->type == (til_type)) break;\
+      else {\
+        if (stk->type == STK_MEM_START) {\
+          mem_start_stk[stk->zid] = stk->u.mem.start;\
+          mem_end_stk[stk->zid]   = stk->u.mem.end;\
+        }\
+        else if (stk->type == STK_REPEAT_INC) {\
+          STACK_AT(stk->u.repeat_inc.si)->u.repeat.count--;\
+        }\
+        else if (stk->type == STK_MEM_END) {\
+          mem_start_stk[stk->zid] = stk->u.mem.start;\
+          mem_end_stk[stk->zid]   = stk->u.mem.end;\
+        }\
+        /* Don't call callout here because negation of total success by (?!..) (?<!..) */\
+      }\
     }\
-    ELSE_IF_STATE_CHECK_MARK(stk);\
   }\
 } while(0)
 
+#define STACK_POP_TIL_ALT_PREC_READ_NOT  do {\
+  POP_TIL_BODY("STACK_POP_TIL_ALT_PREC_READ_NOT", STK_ALT_PREC_READ_NOT);\
+} while(0)
+
 #define STACK_POP_TIL_ALT_LOOK_BEHIND_NOT  do {\
-  while (1) {\
-    stk--;\
-    STACK_BASE_CHECK(stk, "STACK_POP_TIL_ALT_LOOK_BEHIND_NOT"); \
-    if (stk->type == STK_ALT_LOOK_BEHIND_NOT) break;\
-    else if (stk->type == STK_MEM_START) {\
-      mem_start_stk[stk->id] = stk->u.mem.start;\
-      mem_end_stk[stk->id]   = stk->u.mem.end;\
-    }\
-    else if (stk->type == STK_REPEAT_INC) {\
-      STACK_AT(stk->u.repeat_inc.si)->u.repeat.count--;\
-    }\
-    else if (stk->type == STK_MEM_END) {\
-      mem_start_stk[stk->id] = stk->u.mem.start;\
-      mem_end_stk[stk->id]   = stk->u.mem.end;\
-    }\
-    ELSE_IF_STATE_CHECK_MARK(stk);\
-  }\
+  POP_TIL_BODY("STACK_POP_TIL_ALT_LOOK_BEHIND_NOT", STK_ALT_LOOK_BEHIND_NOT);\
 } while(0)
 
+
 #define STACK_EXEC_TO_VOID(k) do {\
   k = stk;\
   while (1) {\
     k--;\
     STACK_BASE_CHECK(k, "STACK_EXEC_TO_VOID"); \
     if (IS_TO_VOID_TARGET(k)) {\
+      if (k->type == STK_TO_VOID_START) {\
+        k->type = STK_VOID;\
+        break;\
+      }\
       k->type = STK_VOID;\
     }\
-    else if (k->type == STK_TO_VOID_START) {\
-      k->type = STK_VOID;\
-      break;\
-    }\
   }\
 } while(0)
 
@@ -989,7 +1841,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
     k--;\
     STACK_BASE_CHECK(k, "STACK_EMPTY_CHECK"); \
     if (k->type == STK_EMPTY_CHECK_START) {\
-      if (k->id == (sid)) {\
+      if (k->zid == (sid)) {\
         (isnull) = (k->u.empty_check.pstr == (s));\
         break;\
       }\
@@ -1004,7 +1856,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
     k--;\
     STACK_BASE_CHECK(k, "STACK_EMPTY_CHECK_MEMST"); \
     if (k->type == STK_EMPTY_CHECK_START) {\
-      if (k->id == (sid)) {\
+      if (k->zid == (sid)) {\
         if (k->u.empty_check.pstr != (s)) {\
           (isnull) = 0;\
           break;\
@@ -1017,7 +1869,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
               if (k->u.mem.end == INVALID_STACK_INDEX) {\
                 (isnull) = 0; break;\
               }\
-              if (MEM_STATUS_AT(reg->bt_mem_end, k->id))\
+              if (MEM_STATUS_AT(reg->bt_mem_end, k->zid))\
                 endp = STACK_AT(k->u.mem.end)->u.mem.pstr;\
               else\
                 endp = (UChar* )k->u.mem.end;\
@@ -1045,7 +1897,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
     k--;\
     STACK_BASE_CHECK(k, "STACK_EMPTY_CHECK_MEMST_REC"); \
     if (k->type == STK_EMPTY_CHECK_START) {\
-      if (k->id == (sid)) {\
+      if (k->zid == (sid)) {\
         if (level == 0) {\
           if (k->u.empty_check.pstr != (s)) {\
             (isnull) = 0;\
@@ -1059,7 +1911,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
                 if (k->u.mem.end == INVALID_STACK_INDEX) {\
                   (isnull) = 0; break;\
                 }\
-                if (MEM_STATUS_AT(reg->bt_mem_end, k->id))\
+                if (MEM_STATUS_AT(reg->bt_mem_end, k->zid))\
                   endp = STACK_AT(k->u.mem.end)->u.mem.pstr;\
                 else\
                   endp = (UChar* )k->u.mem.end;\
@@ -1081,7 +1933,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
       }\
     }\
     else if (k->type == STK_EMPTY_CHECK_END) {\
-      if (k->id == (sid)) level++;\
+      if (k->zid == (sid)) level++;\
     }\
   }\
 } while(0)
@@ -1116,7 +1968,7 @@ stack_double(int is_alloca, char** arg_alloc_base,
     STACK_BASE_CHECK(k, "STACK_GET_REPEAT"); \
     if (k->type == STK_REPEAT) {\
       if (level == 0) {\
-        if (k->id == (sid)) {\
+        if (k->zid == (sid)) {\
           break;\
         }\
       }\
@@ -1208,11 +2060,7 @@ static int string_cmp_ic(OnigEncoding enc, int case_fold_flag,
 #define DATA_ENSURE_CHECK(n)   (s + (n) <= right_range)
 #define DATA_ENSURE(n)         if (s + (n) > right_range) goto fail
 
-#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
 #define INIT_RIGHT_RANGE    right_range = (UChar* )in_right_range
-#else
-#define INIT_RIGHT_RANGE    right_range = (UChar* )end
-#endif
 
 #ifdef USE_CAPTURE_HISTORY
 static int
@@ -1225,7 +2073,7 @@ make_capture_history_tree(OnigCaptureTreeNode* node, StackType** kp,
 
   while (k < stk_top) {
     if (k->type == STK_MEM_START) {
-      n = k->id;
+      n = k->zid;
       if (n <= ONIG_MAX_CAPTURE_HISTORY_GROUP &&
           MEM_STATUS_AT(reg->capture_history, n) != 0) {
         child = history_node_new();
@@ -1243,7 +2091,7 @@ make_capture_history_tree(OnigCaptureTreeNode* node, StackType** kp,
       }
     }
     else if (k->type == STK_MEM_END) {
-      if (k->id == node->group) {
+      if (k->zid == node->group) {
         node->end = (int )(k->u.mem.pstr - str);
         *kp = k;
         return 0;
@@ -1292,7 +2140,7 @@ backref_match_at_nested_level(regex_t* reg,
     }
     else if (level == nest) {
       if (k->type == STK_MEM_START) {
-        if (mem_is_in_memp(k->id, mem_num, memp)) {
+        if (mem_is_in_memp(k->zid, mem_num, memp)) {
           pstart = k->u.mem.pstr;
           if (IS_NOT_NULL(pend)) {
             if (pend - pstart > send - *s) return 0; /* or goto next_mem; */
@@ -1316,7 +2164,7 @@ backref_match_at_nested_level(regex_t* reg,
         }
       }
       else if (k->type == STK_MEM_END) {
-        if (mem_is_in_memp(k->id, mem_num, memp)) {
+        if (mem_is_in_memp(k->zid, mem_num, memp)) {
           pend = k->u.mem.pstr;
         }
       }
@@ -1347,7 +2195,7 @@ backref_check_at_nested_level(regex_t* reg,
     }
     else if (level == nest) {
       if (k->type == STK_MEM_END) {
-        if (mem_is_in_memp(k->id, mem_num, memp)) {
+        if (mem_is_in_memp(k->zid, mem_num, memp)) {
           return 1;
         }
       }
@@ -1391,14 +2239,14 @@ static int OpCurr = OP_FINISH;
 static int OpPrevTarget = OP_FAIL;
 static int MaxStackDepth = 0;
 
-#define MOP_IN(opcode) do {\
+#define SOP_IN(opcode) do {\
   if (opcode == OpPrevTarget) OpPrevCounter[OpCurr]++;\
   OpCurr = opcode;\
   OpCounter[opcode]++;\
   GETTIME(ts);\
 } while(0)
 
-#define MOP_OUT do {\
+#define SOP_OUT do {\
   GETTIME(te);\
   OpTime[OpCurr] += TIMEDIFF(te, ts);\
 } while(0)
@@ -1422,9 +2270,9 @@ onig_print_statistics(FILE* f)
   r = fprintf(f, "   count      prev        time\n");
   if (r < 0) return -1;
 
-  for (i = 0; OnigOpInfo[i].opcode >= 0; i++) {
+  for (i = 0; OpInfo[i].opcode >= 0; i++) {
     r = fprintf(f, "%8d: %8d: %10ld: %s\n",
-                OpCounter[i], OpPrevCounter[i], OpTime[i], OnigOpInfo[i].name);
+                OpCounter[i], OpPrevCounter[i], OpTime[i], OpInfo[i].name);
     if (r < 0) return -1;
   }
   r = fprintf(f, "\nmax stack depth: %d\n", MaxStackDepth);
@@ -1442,8 +2290,8 @@ onig_print_statistics(FILE* f)
 #else
 #define STACK_INC     stk++
 
-#define MOP_IN(opcode)
-#define MOP_OUT
+#define SOP_IN(opcode)
+#define SOP_OUT
 #endif
 
 
@@ -1459,10 +2307,8 @@ typedef struct {
 /* if sstart == str then set sprev to NULL. */
 static int
 match_at(regex_t* reg, const UChar* str, const UChar* end,
-#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
-         const UChar* in_right_range,
-#endif
-         const UChar* sstart, UChar* sprev, OnigMatchArg* msa)
+         const UChar* in_right_range, const UChar* sstart, UChar* sprev,
+         MatchArg* msa)
 {
   static UChar FinishCode[] = { OP_FINISH };
 
@@ -1480,16 +2326,28 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
   StackIndex *repeat_stk;
   StackIndex *mem_start_stk, *mem_end_stk;
   UChar* keep;
-#ifdef USE_COMBINATION_EXPLOSION_CHECK
-  int scv;
-  unsigned char* state_check_buff = msa->state_check_buff;
-  int num_comb_exp_check = reg->num_comb_exp_check;
+#ifdef USE_RETRY_LIMIT_IN_MATCH
+  unsigned long retry_limit_in_match;
+  unsigned long retry_in_match_counter;
 #endif
+
+#ifdef USE_CALLOUT
+  int of;
+#endif
+
   UChar *p = reg->p;
   OnigOptionType option = reg->options;
   OnigEncoding encode = reg->enc;
   OnigCaseFoldType case_fold_flag = reg->case_fold_flag;
 
+#ifdef USE_CALLOUT
+  msa->mp->match_at_call_counter++;
+#endif
+
+#ifdef USE_RETRY_LIMIT_IN_MATCH
+  retry_limit_in_match = msa->retry_limit_in_match;
+#endif
+
   //n = reg->num_repeat + reg->num_mem * 2;
   pop_level = reg->stack_pop_level;
   num_mem = reg->num_mem;
@@ -1506,11 +2364,15 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           (int )(end - str), (int )(sstart - str));
 #endif
 
-  STACK_PUSH_ENSURED(STK_ALT, FinishCode);  /* bottom stack */
   best_len = ONIG_MISMATCH;
   keep = s = (UChar* )sstart;
+  STACK_PUSH_BOTTOM(STK_ALT, FinishCode);  /* bottom stack */
   INIT_RIGHT_RANGE;
 
+#ifdef USE_RETRY_LIMIT_IN_MATCH
+  retry_in_match_counter = 0;
+#endif
+
   while (1) {
 #ifdef ONIG_DEBUG_MATCH
     {
@@ -1533,7 +2395,10 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       fputs((char* )buf, stderr);
 
       for (i = 0; i < 20 - (bp - buf); i++) fputc(' ', stderr);
-      fprintf(stderr, "%4d: ", (int )(p - reg->p));
+      if (p == FinishCode)
+        fprintf(stderr, "----: ");
+      else
+        fprintf(stderr, "%4d: ", (int )(p - reg->p));
       onig_print_compiled_byte_code(stderr, p, NULL, reg->p, encode);
       fprintf(stderr, "\n");
     }
@@ -1541,7 +2406,7 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
 
     sbegin = s;
     switch (*p++) {
-    case OP_END:  MOP_IN(OP_END);
+    case OP_END:  SOP_IN(OP_END);
       n = (int )(s - sstart);
       if (n > best_len) {
         OnigRegion* region;
@@ -1639,7 +2504,7 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
 #ifdef USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE
     end_best_len:
 #endif
-      MOP_OUT;
+      SOP_OUT;
 
       if (IS_FIND_CONDITION(option)) {
         if (IS_FIND_NOT_EMPTY(option) && s == sstart) {
@@ -1655,14 +2520,14 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       goto finish;
       break;
 
-    case OP_EXACT1:  MOP_IN(OP_EXACT1);
+    case OP_EXACT1:  SOP_IN(OP_EXACT1);
       DATA_ENSURE(1);
       if (*p != *s) goto fail;
       p++; s++;
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_EXACT1_IC:  MOP_IN(OP_EXACT1_IC);
+    case OP_EXACT1_IC:  SOP_IN(OP_EXACT1_IC);
       {
         int len;
         UChar *q, lowbuf[ONIGENC_MBC_CASE_FOLD_MAXLEN];
@@ -1681,21 +2546,21 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           p++; q++;
         }
       }
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_EXACT2:  MOP_IN(OP_EXACT2);
+    case OP_EXACT2:  SOP_IN(OP_EXACT2);
       DATA_ENSURE(2);
       if (*p != *s) goto fail;
       p++; s++;
       if (*p != *s) goto fail;
       sprev = s;
       p++; s++;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_EXACT3:  MOP_IN(OP_EXACT3);
+    case OP_EXACT3:  SOP_IN(OP_EXACT3);
       DATA_ENSURE(3);
       if (*p != *s) goto fail;
       p++; s++;
@@ -1704,11 +2569,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       if (*p != *s) goto fail;
       sprev = s;
       p++; s++;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_EXACT4:  MOP_IN(OP_EXACT4);
+    case OP_EXACT4:  SOP_IN(OP_EXACT4);
       DATA_ENSURE(4);
       if (*p != *s) goto fail;
       p++; s++;
@@ -1719,11 +2584,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       if (*p != *s) goto fail;
       sprev = s;
       p++; s++;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_EXACT5:  MOP_IN(OP_EXACT5);
+    case OP_EXACT5:  SOP_IN(OP_EXACT5);
       DATA_ENSURE(5);
       if (*p != *s) goto fail;
       p++; s++;
@@ -1736,22 +2601,22 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       if (*p != *s) goto fail;
       sprev = s;
       p++; s++;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_EXACTN:  MOP_IN(OP_EXACTN);
+    case OP_EXACTN:  SOP_IN(OP_EXACTN);
       GET_LENGTH_INC(tlen, p);
       DATA_ENSURE(tlen);
       while (tlen-- > 0) {
         if (*p++ != *s++) goto fail;
       }
       sprev = s - 1;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_EXACTN_IC:  MOP_IN(OP_EXACTN_IC);
+    case OP_EXACTN_IC:  SOP_IN(OP_EXACTN_IC);
       {
         int len;
         UChar *q, *endp, lowbuf[ONIGENC_MBC_CASE_FOLD_MAXLEN];
@@ -1775,20 +2640,20 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         }
       }
 
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_EXACTMB2N1:  MOP_IN(OP_EXACTMB2N1);
+    case OP_EXACTMB2N1:  SOP_IN(OP_EXACTMB2N1);
       DATA_ENSURE(2);
       if (*p != *s) goto fail;
       p++; s++;
       if (*p != *s) goto fail;
       p++; s++;
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_EXACTMB2N2:  MOP_IN(OP_EXACTMB2N2);
+    case OP_EXACTMB2N2:  SOP_IN(OP_EXACTMB2N2);
       DATA_ENSURE(4);
       if (*p != *s) goto fail;
       p++; s++;
@@ -1799,11 +2664,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       p++; s++;
       if (*p != *s) goto fail;
       p++; s++;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_EXACTMB2N3:  MOP_IN(OP_EXACTMB2N3);
+    case OP_EXACTMB2N3:  SOP_IN(OP_EXACTMB2N3);
       DATA_ENSURE(6);
       if (*p != *s) goto fail;
       p++; s++;
@@ -1818,11 +2683,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       p++; s++;
       if (*p != *s) goto fail;
       p++; s++;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_EXACTMB2N:  MOP_IN(OP_EXACTMB2N);
+    case OP_EXACTMB2N:  SOP_IN(OP_EXACTMB2N);
       GET_LENGTH_INC(tlen, p);
       DATA_ENSURE(tlen * 2);
       while (tlen-- > 0) {
@@ -1832,11 +2697,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         p++; s++;
       }
       sprev = s - 2;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_EXACTMB3N:  MOP_IN(OP_EXACTMB3N);
+    case OP_EXACTMB3N:  SOP_IN(OP_EXACTMB3N);
       GET_LENGTH_INC(tlen, p);
       DATA_ENSURE(tlen * 3);
       while (tlen-- > 0) {
@@ -1848,11 +2713,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         p++; s++;
       }
       sprev = s - 3;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_EXACTMBN:  MOP_IN(OP_EXACTMBN);
+    case OP_EXACTMBN:  SOP_IN(OP_EXACTMBN);
       GET_LENGTH_INC(tlen,  p);  /* mb-len */
       GET_LENGTH_INC(tlen2, p);  /* string len */
       tlen2 *= tlen;
@@ -1862,19 +2727,19 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         p++; s++;
       }
       sprev = s - tlen;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_CCLASS:  MOP_IN(OP_CCLASS);
+    case OP_CCLASS:  SOP_IN(OP_CCLASS);
       DATA_ENSURE(1);
       if (BITSET_AT(((BitSetRef )p), *s) == 0) goto fail;
       p += SIZE_BITSET;
       s += enclen(encode, s);   /* OP_CCLASS can match mb-code. \D, \S */
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_CCLASS_MB:  MOP_IN(OP_CCLASS_MB);
+    case OP_CCLASS_MB:  SOP_IN(OP_CCLASS_MB);
       if (! ONIGENC_IS_MBC_HEAD(encode, s)) goto fail;
 
     cclass_mb:
@@ -1900,10 +2765,10 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
 #endif
       }
       p += tlen;
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_CCLASS_MIX:  MOP_IN(OP_CCLASS_MIX);
+    case OP_CCLASS_MIX:  SOP_IN(OP_CCLASS_MIX);
       DATA_ENSURE(1);
       if (ONIGENC_IS_MBC_HEAD(encode, s)) {
         p += SIZE_BITSET;
@@ -1918,18 +2783,18 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         p += tlen;
         s++;
       }
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_CCLASS_NOT:  MOP_IN(OP_CCLASS_NOT);
+    case OP_CCLASS_NOT:  SOP_IN(OP_CCLASS_NOT);
       DATA_ENSURE(1);
       if (BITSET_AT(((BitSetRef )p), *s) != 0) goto fail;
       p += SIZE_BITSET;
       s += enclen(encode, s);
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_CCLASS_MB_NOT:  MOP_IN(OP_CCLASS_MB_NOT);
+    case OP_CCLASS_MB_NOT:  SOP_IN(OP_CCLASS_MB_NOT);
       DATA_ENSURE(1);
       if (! ONIGENC_IS_MBC_HEAD(encode, s)) {
         s++;
@@ -1967,10 +2832,10 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       p += tlen;
 
     cc_mb_not_success:
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_CCLASS_MIX_NOT:  MOP_IN(OP_CCLASS_MIX_NOT);
+    case OP_CCLASS_MIX_NOT:  SOP_IN(OP_CCLASS_MIX_NOT);
       DATA_ENSURE(1);
       if (ONIGENC_IS_MBC_HEAD(encode, s)) {
         p += SIZE_BITSET;
@@ -1985,11 +2850,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         p += tlen;
         s++;
       }
-      MOP_OUT;
+      SOP_OUT;
       break;
 
 #ifdef USE_OP_CCLASS_NODE
-    case OP_CCLASS_NODE:  MOP_IN(OP_CCLASS_NODE);
+    case OP_CCLASS_NODE:  SOP_IN(OP_CCLASS_NODE);
       {
         OnigCodePoint code;
         void *node;
@@ -2005,28 +2870,28 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         code = ONIGENC_MBC_TO_CODE(encode, ss, s);
         if (onig_is_code_in_cc_len(mb_len, code, node) == 0) goto fail;
       }
-      MOP_OUT;
+      SOP_OUT;
       break;
 #endif
 
-    case OP_ANYCHAR:  MOP_IN(OP_ANYCHAR);
+    case OP_ANYCHAR:  SOP_IN(OP_ANYCHAR);
       DATA_ENSURE(1);
       n = enclen(encode, s);
       DATA_ENSURE(n);
       if (ONIGENC_IS_MBC_NEWLINE(encode, s, end)) goto fail;
       s += n;
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_ANYCHAR_ML:  MOP_IN(OP_ANYCHAR_ML);
+    case OP_ANYCHAR_ML:  SOP_IN(OP_ANYCHAR_ML);
       DATA_ENSURE(1);
       n = enclen(encode, s);
       DATA_ENSURE(n);
       s += n;
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_ANYCHAR_STAR:  MOP_IN(OP_ANYCHAR_STAR);
+    case OP_ANYCHAR_STAR:  SOP_IN(OP_ANYCHAR_STAR);
       while (DATA_ENSURE_CHECK1) {
         STACK_PUSH_ALT(p, s, sprev);
         n = enclen(encode, s);
@@ -2035,11 +2900,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         sprev = s;
         s += n;
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_ANYCHAR_ML_STAR:  MOP_IN(OP_ANYCHAR_ML_STAR);
+    case OP_ANYCHAR_ML_STAR:  SOP_IN(OP_ANYCHAR_ML_STAR);
       while (DATA_ENSURE_CHECK1) {
         STACK_PUSH_ALT(p, s, sprev);
         n = enclen(encode, s);
@@ -2053,11 +2918,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           s++;
         }
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_ANYCHAR_STAR_PEEK_NEXT:  MOP_IN(OP_ANYCHAR_STAR_PEEK_NEXT);
+    case OP_ANYCHAR_STAR_PEEK_NEXT:  SOP_IN(OP_ANYCHAR_STAR_PEEK_NEXT);
       while (DATA_ENSURE_CHECK1) {
         if (*p == *s) {
           STACK_PUSH_ALT(p + 1, s, sprev);
@@ -2069,10 +2934,10 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         s += n;
       }
       p++;
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_ANYCHAR_ML_STAR_PEEK_NEXT:MOP_IN(OP_ANYCHAR_ML_STAR_PEEK_NEXT);
+    case OP_ANYCHAR_ML_STAR_PEEK_NEXT:SOP_IN(OP_ANYCHAR_ML_STAR_PEEK_NEXT);
       while (DATA_ENSURE_CHECK1) {
         if (*p == *s) {
           STACK_PUSH_ALT(p + 1, s, sprev);
@@ -2089,87 +2954,46 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         }
       }
       p++;
-      MOP_OUT;
-      break;
-
-#ifdef USE_COMBINATION_EXPLOSION_CHECK
-    case OP_STATE_CHECK_ANYCHAR_STAR:  MOP_IN(OP_STATE_CHECK_ANYCHAR_STAR);
-      GET_STATE_CHECK_NUM_INC(mem, p);
-      while (DATA_ENSURE_CHECK1) {
-        STATE_CHECK_VAL(scv, mem);
-        if (scv) goto fail;
-
-        STACK_PUSH_ALT_WITH_STATE_CHECK(p, s, sprev, mem);
-        n = enclen(encode, s);
-        DATA_ENSURE(n);
-        if (ONIGENC_IS_MBC_NEWLINE(encode, s, end))  goto fail;
-        sprev = s;
-        s += n;
-      }
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_STATE_CHECK_ANYCHAR_ML_STAR:
-      MOP_IN(OP_STATE_CHECK_ANYCHAR_ML_STAR);
-
-      GET_STATE_CHECK_NUM_INC(mem, p);
-      while (DATA_ENSURE_CHECK1) {
-        STATE_CHECK_VAL(scv, mem);
-        if (scv) goto fail;
-
-        STACK_PUSH_ALT_WITH_STATE_CHECK(p, s, sprev, mem);
-        n = enclen(encode, s);
-        if (n > 1) {
-          DATA_ENSURE(n);
-          sprev = s;
-          s += n;
-        }
-        else {
-          sprev = s;
-          s++;
-        }
-      }
-      MOP_OUT;
-      break;
-#endif /* USE_COMBINATION_EXPLOSION_CHECK */
-
-    case OP_WORD:  MOP_IN(OP_WORD);
+    case OP_WORD:  SOP_IN(OP_WORD);
       DATA_ENSURE(1);
       if (! ONIGENC_IS_MBC_WORD(encode, s, end))
         goto fail;
 
       s += enclen(encode, s);
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_WORD_ASCII:  MOP_IN(OP_WORD_ASCII);
+    case OP_WORD_ASCII:  SOP_IN(OP_WORD_ASCII);
       DATA_ENSURE(1);
       if (! ONIGENC_IS_MBC_WORD_ASCII(encode, s, end))
         goto fail;
 
       s += enclen(encode, s);
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_NO_WORD:  MOP_IN(OP_NO_WORD);
+    case OP_NO_WORD:  SOP_IN(OP_NO_WORD);
       DATA_ENSURE(1);
       if (ONIGENC_IS_MBC_WORD(encode, s, end))
         goto fail;
 
       s += enclen(encode, s);
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_NO_WORD_ASCII:  MOP_IN(OP_NO_WORD_ASCII);
+    case OP_NO_WORD_ASCII:  SOP_IN(OP_NO_WORD_ASCII);
       DATA_ENSURE(1);
       if (ONIGENC_IS_MBC_WORD_ASCII(encode, s, end))
         goto fail;
 
       s += enclen(encode, s);
-      MOP_OUT;
+      SOP_OUT;
       break;
 
-    case OP_WORD_BOUNDARY:  MOP_IN(OP_WORD_BOUNDARY);
+    case OP_WORD_BOUNDARY:  SOP_IN(OP_WORD_BOUNDARY);
       {
         ModeType mode;
         GET_MODE_INC(mode, p); // ascii_mode
@@ -2189,11 +3013,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
             goto fail;
         }
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_NO_WORD_BOUNDARY:  MOP_IN(OP_NO_WORD_BOUNDARY);
+    case OP_NO_WORD_BOUNDARY:  SOP_IN(OP_NO_WORD_BOUNDARY);
       {
         ModeType mode;
         GET_MODE_INC(mode, p); // ascii_mode
@@ -2212,20 +3036,19 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
             goto fail;
         }
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
 #ifdef USE_WORD_BEGIN_END
-    case OP_WORD_BEGIN:  MOP_IN(OP_WORD_BEGIN);
+    case OP_WORD_BEGIN:  SOP_IN(OP_WORD_BEGIN);
       {
         ModeType mode;
         GET_MODE_INC(mode, p); // ascii_mode
 
         if (DATA_ENSURE_CHECK1 && IS_MBC_WORD_ASCII_MODE(encode, s, end, mode)) {
-          if (ON_STR_BEGIN(s) ||
-              ! IS_MBC_WORD_ASCII_MODE(encode, sprev, end, mode)) {
-            MOP_OUT;
+          if (ON_STR_BEGIN(s) || !IS_MBC_WORD_ASCII_MODE(encode, sprev, end, mode)) {
+            SOP_OUT;
             continue;
           }
         }
@@ -2233,14 +3056,14 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       goto fail;
       break;
 
-    case OP_WORD_END:  MOP_IN(OP_WORD_END);
+    case OP_WORD_END:  SOP_IN(OP_WORD_END);
       {
         ModeType mode;
         GET_MODE_INC(mode, p); // ascii_mode
 
         if (!ON_STR_BEGIN(s) && IS_MBC_WORD_ASCII_MODE(encode, sprev, end, mode)) {
           if (ON_STR_END(s) || ! IS_MBC_WORD_ASCII_MODE(encode, s, end, mode)) {
-            MOP_OUT;
+            SOP_OUT;
             continue;
           }
         }
@@ -2250,82 +3073,82 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
 #endif
 
     case OP_EXTENDED_GRAPHEME_CLUSTER_BOUNDARY:
-      MOP_IN(OP_EXTENDED_GRAPHEME_CLUSTER_BOUNDARY);
+      SOP_IN(OP_EXTENDED_GRAPHEME_CLUSTER_BOUNDARY);
       if (onigenc_egcb_is_break_position(encode, s, sprev, str, end)) {
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       goto fail;
       break;
 
     case OP_NO_EXTENDED_GRAPHEME_CLUSTER_BOUNDARY:
-      MOP_IN(OP_NO_EXTENDED_GRAPHEME_CLUSTER_BOUNDARY);
+      SOP_IN(OP_NO_EXTENDED_GRAPHEME_CLUSTER_BOUNDARY);
       if (onigenc_egcb_is_break_position(encode, s, sprev, str, end))
         goto fail;
 
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_BEGIN_BUF:  MOP_IN(OP_BEGIN_BUF);
+    case OP_BEGIN_BUF:  SOP_IN(OP_BEGIN_BUF);
       if (! ON_STR_BEGIN(s)) goto fail;
 
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_END_BUF:  MOP_IN(OP_END_BUF);
+    case OP_END_BUF:  SOP_IN(OP_END_BUF);
       if (! ON_STR_END(s)) goto fail;
 
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_BEGIN_LINE:  MOP_IN(OP_BEGIN_LINE);
+    case OP_BEGIN_LINE:  SOP_IN(OP_BEGIN_LINE);
       if (ON_STR_BEGIN(s)) {
         if (IS_NOTBOL(msa->options)) goto fail;
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       else if (ONIGENC_IS_MBC_NEWLINE(encode, sprev, end) && !ON_STR_END(s)) {
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       goto fail;
       break;
 
-    case OP_END_LINE:  MOP_IN(OP_END_LINE);
+    case OP_END_LINE:  SOP_IN(OP_END_LINE);
       if (ON_STR_END(s)) {
 #ifndef USE_NEWLINE_AT_END_OF_STRING_HAS_EMPTY_LINE
         if (IS_EMPTY_STR || !ONIGENC_IS_MBC_NEWLINE(encode, sprev, end)) {
 #endif
           if (IS_NOTEOL(msa->options)) goto fail;
-          MOP_OUT;
+          SOP_OUT;
           continue;
 #ifndef USE_NEWLINE_AT_END_OF_STRING_HAS_EMPTY_LINE
         }
 #endif
       }
       else if (ONIGENC_IS_MBC_NEWLINE(encode, s, end)) {
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
 #ifdef USE_CRNL_AS_LINE_TERMINATOR
       else if (ONIGENC_IS_MBC_CRNL(encode, s, end)) {
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
 #endif
       goto fail;
       break;
 
-    case OP_SEMI_END_BUF:  MOP_IN(OP_SEMI_END_BUF);
+    case OP_SEMI_END_BUF:  SOP_IN(OP_SEMI_END_BUF);
       if (ON_STR_END(s)) {
 #ifndef USE_NEWLINE_AT_END_OF_STRING_HAS_EMPTY_LINE
         if (IS_EMPTY_STR || !ONIGENC_IS_MBC_NEWLINE(encode, sprev, end)) {
 #endif
           if (IS_NOTEOL(msa->options)) goto fail;
-          MOP_OUT;
+          SOP_OUT;
           continue;
 #ifndef USE_NEWLINE_AT_END_OF_STRING_HAS_EMPTY_LINE
         }
@@ -2333,7 +3156,7 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       }
       else if (ONIGENC_IS_MBC_NEWLINE(encode, s, end) &&
                ON_STR_END(s + enclen(encode, s))) {
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
 #ifdef USE_CRNL_AS_LINE_TERMINATOR
@@ -2341,7 +3164,7 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         UChar* ss = s + enclen(encode, s);
         ss += enclen(encode, ss);
         if (ON_STR_END(ss)) {
-          MOP_OUT;
+          SOP_OUT;
           continue;
         }
       }
@@ -2349,53 +3172,53 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       goto fail;
       break;
 
-    case OP_BEGIN_POSITION:  MOP_IN(OP_BEGIN_POSITION);
+    case OP_BEGIN_POSITION:  SOP_IN(OP_BEGIN_POSITION);
       if (s != msa->start)
         goto fail;
 
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_MEMORY_START_PUSH:  MOP_IN(OP_MEMORY_START_PUSH);
+    case OP_MEMORY_START_PUSH:  SOP_IN(OP_MEMORY_START_PUSH);
       GET_MEMNUM_INC(mem, p);
       STACK_PUSH_MEM_START(mem, s);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_MEMORY_START:  MOP_IN(OP_MEMORY_START);
+    case OP_MEMORY_START:  SOP_IN(OP_MEMORY_START);
       GET_MEMNUM_INC(mem, p);
       mem_start_stk[mem] = (StackIndex )((void* )s);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_MEMORY_END_PUSH:  MOP_IN(OP_MEMORY_END_PUSH);
+    case OP_MEMORY_END_PUSH:  SOP_IN(OP_MEMORY_END_PUSH);
       GET_MEMNUM_INC(mem, p);
       STACK_PUSH_MEM_END(mem, s);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_MEMORY_END:  MOP_IN(OP_MEMORY_END);
+    case OP_MEMORY_END:  SOP_IN(OP_MEMORY_END);
       GET_MEMNUM_INC(mem, p);
       mem_end_stk[mem] = (StackIndex )((void* )s);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
 #ifdef USE_CALL
-    case OP_MEMORY_END_PUSH_REC:  MOP_IN(OP_MEMORY_END_PUSH_REC);
+    case OP_MEMORY_END_PUSH_REC:  SOP_IN(OP_MEMORY_END_PUSH_REC);
       GET_MEMNUM_INC(mem, p);
       STACK_GET_MEM_START(mem, stkp); /* should be before push mem-end. */
       STACK_PUSH_MEM_END(mem, s);
       mem_start_stk[mem] = GET_STACK_INDEX(stkp);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_MEMORY_END_REC:  MOP_IN(OP_MEMORY_END_REC);
+    case OP_MEMORY_END_REC:  SOP_IN(OP_MEMORY_END_REC);
       GET_MEMNUM_INC(mem, p);
       mem_end_stk[mem] = (StackIndex )((void* )s);
       STACK_GET_MEM_START(mem, stkp);
@@ -2406,22 +3229,22 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         mem_start_stk[mem] = (StackIndex )((void* )stkp->u.mem.pstr);
 
       STACK_PUSH_MEM_END_MARK(mem);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 #endif
 
-    case OP_BACKREF1:  MOP_IN(OP_BACKREF1);
+    case OP_BACKREF1:  SOP_IN(OP_BACKREF1);
       mem = 1;
       goto backref;
       break;
 
-    case OP_BACKREF2:  MOP_IN(OP_BACKREF2);
+    case OP_BACKREF2:  SOP_IN(OP_BACKREF2);
       mem = 2;
       goto backref;
       break;
 
-    case OP_BACKREF_N:  MOP_IN(OP_BACKREF_N);
+    case OP_BACKREF_N:  SOP_IN(OP_BACKREF_N);
       GET_MEMNUM_INC(mem, p);
     backref:
       {
@@ -2446,12 +3269,12 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         while (sprev + (len = enclen(encode, sprev)) < s)
           sprev += len;
 
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       break;
 
-    case OP_BACKREF_N_IC:  MOP_IN(OP_BACKREF_N_IC);
+    case OP_BACKREF_N_IC:  SOP_IN(OP_BACKREF_N_IC);
       GET_MEMNUM_INC(mem, p);
       {
         int len;
@@ -2475,12 +3298,12 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         while (sprev + (len = enclen(encode, sprev)) < s)
           sprev += len;
 
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       break;
 
-    case OP_BACKREF_MULTI:  MOP_IN(OP_BACKREF_MULTI);
+    case OP_BACKREF_MULTI:  SOP_IN(OP_BACKREF_MULTI);
       {
         int len, is_fail;
         UChar *pstart, *pend, *swork;
@@ -2514,12 +3337,12 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           break; /* success */
         }
         if (i == tlen) goto fail;
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       break;
 
-    case OP_BACKREF_MULTI_IC:  MOP_IN(OP_BACKREF_MULTI_IC);
+    case OP_BACKREF_MULTI_IC:  SOP_IN(OP_BACKREF_MULTI_IC);
       {
         int len, is_fail;
         UChar *pstart, *pend, *swork;
@@ -2553,7 +3376,7 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           break; /* success */
         }
         if (i == tlen) goto fail;
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       break;
@@ -2580,13 +3403,13 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         else
           goto fail;
 
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       break;
 #endif
 
-    case OP_BACKREF_CHECK:  MOP_IN(OP_BACKREF_CHECK);
+    case OP_BACKREF_CHECK:  SOP_IN(OP_BACKREF_CHECK);
       {
         GET_LENGTH_INC(tlen, p);
         for (i = 0; i < tlen; i++) {
@@ -2599,7 +3422,7 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           break; /* success */
         }
         if (i == tlen) goto fail;
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       break;
@@ -2619,36 +3442,36 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         else
           goto fail;
 
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       break;
 #endif
 
 #if 0   /* no need: IS_DYNAMIC_OPTION() == 0 */
-    case OP_SET_OPTION_PUSH:  MOP_IN(OP_SET_OPTION_PUSH);
+    case OP_SET_OPTION_PUSH:  SOP_IN(OP_SET_OPTION_PUSH);
       GET_OPTION_INC(option, p);
       STACK_PUSH_ALT(p, s, sprev);
       p += SIZE_OP_SET_OPTION + SIZE_OP_FAIL;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_SET_OPTION:  MOP_IN(OP_SET_OPTION);
+    case OP_SET_OPTION:  SOP_IN(OP_SET_OPTION);
       GET_OPTION_INC(option, p);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 #endif
 
-    case OP_EMPTY_CHECK_START:  MOP_IN(OP_EMPTY_CHECK_START);
+    case OP_EMPTY_CHECK_START:  SOP_IN(OP_EMPTY_CHECK_START);
       GET_MEMNUM_INC(mem, p);    /* mem: null check id */
       STACK_PUSH_EMPTY_CHECK_START(mem, s);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_EMPTY_CHECK_END:  MOP_IN(OP_EMPTY_CHECK_END);
+    case OP_EMPTY_CHECK_END:  SOP_IN(OP_EMPTY_CHECK_END);
       {
         int is_empty;
 
@@ -2677,12 +3500,12 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           }
         }
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
 #ifdef USE_INSISTENT_CHECK_CAPTURES_STATUS_IN_ENDLESS_REPEAT
-    case OP_EMPTY_CHECK_END_MEMST:  MOP_IN(OP_EMPTY_CHECK_END_MEMST);
+    case OP_EMPTY_CHECK_END_MEMST:  SOP_IN(OP_EMPTY_CHECK_END_MEMST);
       {
         int is_empty;
 
@@ -2696,14 +3519,14 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           goto empty_check_found;
         }
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 #endif
 
 #ifdef USE_CALL
     case OP_EMPTY_CHECK_END_MEMST_PUSH:
-      MOP_IN(OP_EMPTY_CHECK_END_MEMST_PUSH);
+      SOP_IN(OP_EMPTY_CHECK_END_MEMST_PUSH);
       {
         int is_empty;
 
@@ -2725,103 +3548,68 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           STACK_PUSH_EMPTY_CHECK_END(mem);
         }
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 #endif
 
-    case OP_JUMP:  MOP_IN(OP_JUMP);
+    case OP_JUMP:  SOP_IN(OP_JUMP);
       GET_RELADDR_INC(addr, p);
       p += addr;
-      MOP_OUT;
-      CHECK_INTERRUPT_IN_MATCH_AT;
+      SOP_OUT;
+      CHECK_INTERRUPT_IN_MATCH;
       continue;
       break;
 
-    case OP_PUSH:  MOP_IN(OP_PUSH);
+    case OP_PUSH:  SOP_IN(OP_PUSH);
       GET_RELADDR_INC(addr, p);
       STACK_PUSH_ALT(p + addr, s, sprev);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_PUSH_SUPER:  MOP_IN(OP_PUSH_SUPER);
+    case OP_PUSH_SUPER:  SOP_IN(OP_PUSH_SUPER);
       GET_RELADDR_INC(addr, p);
       STACK_PUSH_SUPER_ALT(p + addr, s, sprev);
-      MOP_OUT;
-      continue;
-      break;
-
-#ifdef USE_COMBINATION_EXPLOSION_CHECK
-    case OP_STATE_CHECK_PUSH:  MOP_IN(OP_STATE_CHECK_PUSH);
-      GET_STATE_CHECK_NUM_INC(mem, p);
-      STATE_CHECK_VAL(scv, mem);
-      if (scv) goto fail;
-
-      GET_RELADDR_INC(addr, p);
-      STACK_PUSH_ALT_WITH_STATE_CHECK(p + addr, s, sprev, mem);
-      MOP_OUT;
-      continue;
-      break;
-
-    case OP_STATE_CHECK_PUSH_OR_JUMP:  MOP_IN(OP_STATE_CHECK_PUSH_OR_JUMP);
-      GET_STATE_CHECK_NUM_INC(mem, p);
-      GET_RELADDR_INC(addr, p);
-      STATE_CHECK_VAL(scv, mem);
-      if (scv) {
-        p += addr;
-      }
-      else {
-        STACK_PUSH_ALT_WITH_STATE_CHECK(p + addr, s, sprev, mem);
-      }
-      MOP_OUT;
-      continue;
-      break;
-
-    case OP_STATE_CHECK:  MOP_IN(OP_STATE_CHECK);
-      GET_STATE_CHECK_NUM_INC(mem, p);
-      STATE_CHECK_VAL(scv, mem);
-      if (scv) goto fail;
-
-      STACK_PUSH_STATE_CHECK(s, mem);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
-#endif /* USE_COMBINATION_EXPLOSION_CHECK */
 
-    case OP_POP:  MOP_IN(OP_POP);
+    case OP_POP_OUT:  SOP_IN(OP_POP_OUT);
       STACK_POP_ONE;
-      MOP_OUT;
+      // for stop backtrack
+      //CHECK_RETRY_LIMIT_IN_MATCH;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_PUSH_OR_JUMP_EXACT1:  MOP_IN(OP_PUSH_OR_JUMP_EXACT1);
+    case OP_PUSH_OR_JUMP_EXACT1:  SOP_IN(OP_PUSH_OR_JUMP_EXACT1);
       GET_RELADDR_INC(addr, p);
       if (*p == *s && DATA_ENSURE_CHECK1) {
         p++;
         STACK_PUSH_ALT(p + addr, s, sprev);
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       p += (addr + 1);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_PUSH_IF_PEEK_NEXT:  MOP_IN(OP_PUSH_IF_PEEK_NEXT);
+    case OP_PUSH_IF_PEEK_NEXT:  SOP_IN(OP_PUSH_IF_PEEK_NEXT);
       GET_RELADDR_INC(addr, p);
       if (*p == *s) {
         p++;
         STACK_PUSH_ALT(p + addr, s, sprev);
-        MOP_OUT;
+        SOP_OUT;
         continue;
       }
       p++;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_REPEAT:  MOP_IN(OP_REPEAT);
+    case OP_REPEAT:  SOP_IN(OP_REPEAT);
       {
         GET_MEMNUM_INC(mem, p);    /* mem: OP_REPEAT ID */
         GET_RELADDR_INC(addr, p);
@@ -2834,11 +3622,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           STACK_PUSH_ALT(p + addr, s, sprev);
         }
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_REPEAT_NG:  MOP_IN(OP_REPEAT_NG);
+    case OP_REPEAT_NG:  SOP_IN(OP_REPEAT_NG);
       {
         GET_MEMNUM_INC(mem, p);    /* mem: OP_REPEAT ID */
         GET_RELADDR_INC(addr, p);
@@ -2852,11 +3640,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           p += addr;
         }
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_REPEAT_INC:  MOP_IN(OP_REPEAT_INC);
+    case OP_REPEAT_INC:  SOP_IN(OP_REPEAT_INC);
       GET_MEMNUM_INC(mem, p); /* mem: OP_REPEAT ID */
       si = repeat_stk[mem];
       stkp = STACK_AT(si);
@@ -2874,19 +3662,19 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         p = stkp->u.repeat.pcode;
       }
       STACK_PUSH_REPEAT_INC(si);
-      MOP_OUT;
-      CHECK_INTERRUPT_IN_MATCH_AT;
+      SOP_OUT;
+      CHECK_INTERRUPT_IN_MATCH;
       continue;
       break;
 
-    case OP_REPEAT_INC_SG:  MOP_IN(OP_REPEAT_INC_SG);
+    case OP_REPEAT_INC_SG:  SOP_IN(OP_REPEAT_INC_SG);
       GET_MEMNUM_INC(mem, p); /* mem: OP_REPEAT ID */
       STACK_GET_REPEAT(mem, stkp);
       si = GET_STACK_INDEX(stkp);
       goto repeat_inc;
       break;
 
-    case OP_REPEAT_INC_NG:  MOP_IN(OP_REPEAT_INC_NG);
+    case OP_REPEAT_INC_NG:  SOP_IN(OP_REPEAT_INC_NG);
       GET_MEMNUM_INC(mem, p); /* mem: OP_REPEAT ID */
       si = repeat_stk[mem];
       stkp = STACK_AT(si);
@@ -2908,68 +3696,68 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       else if (stkp->u.repeat.count == reg->repeat_range[mem].upper) {
         STACK_PUSH_REPEAT_INC(si);
       }
-      MOP_OUT;
-      CHECK_INTERRUPT_IN_MATCH_AT;
+      SOP_OUT;
+      CHECK_INTERRUPT_IN_MATCH;
       continue;
       break;
 
-    case OP_REPEAT_INC_NG_SG:  MOP_IN(OP_REPEAT_INC_NG_SG);
+    case OP_REPEAT_INC_NG_SG:  SOP_IN(OP_REPEAT_INC_NG_SG);
       GET_MEMNUM_INC(mem, p); /* mem: OP_REPEAT ID */
       STACK_GET_REPEAT(mem, stkp);
       si = GET_STACK_INDEX(stkp);
       goto repeat_inc_ng;
       break;
 
-    case OP_PREC_READ_START:  MOP_IN(OP_PREC_READ_START);
+    case OP_PREC_READ_START:  SOP_IN(OP_PREC_READ_START);
       STACK_PUSH_POS(s, sprev);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_PREC_READ_END:  MOP_IN(OP_PREC_READ_END);
+    case OP_PREC_READ_END:  SOP_IN(OP_PREC_READ_END);
       {
         STACK_EXEC_TO_VOID(stkp);
         s     = stkp->u.state.pstr;
         sprev = stkp->u.state.pstr_prev;
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_PREC_READ_NOT_START:  MOP_IN(OP_PREC_READ_NOT_START);
+    case OP_PREC_READ_NOT_START:  SOP_IN(OP_PREC_READ_NOT_START);
       GET_RELADDR_INC(addr, p);
       STACK_PUSH_ALT_PREC_READ_NOT(p + addr, s, sprev);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_PREC_READ_NOT_END:  MOP_IN(OP_PREC_READ_NOT_END);
+    case OP_PREC_READ_NOT_END:  SOP_IN(OP_PREC_READ_NOT_END);
       STACK_POP_TIL_ALT_PREC_READ_NOT;
       goto fail;
       break;
 
-    case OP_ATOMIC_START:  MOP_IN(OP_ATOMIC_START);
+    case OP_ATOMIC_START:  SOP_IN(OP_ATOMIC_START);
       STACK_PUSH_TO_VOID_START;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_ATOMIC_END:  MOP_IN(OP_ATOMIC_END);
+    case OP_ATOMIC_END:  SOP_IN(OP_ATOMIC_END);
       STACK_EXEC_TO_VOID(stkp);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_LOOK_BEHIND:  MOP_IN(OP_LOOK_BEHIND);
+    case OP_LOOK_BEHIND:  SOP_IN(OP_LOOK_BEHIND);
       GET_LENGTH_INC(tlen, p);
       s = (UChar* )ONIGENC_STEP_BACK(encode, str, s, (int )tlen);
       if (IS_NULL(s)) goto fail;
       sprev = (UChar* )onigenc_get_prev_char_head(encode, str, s);
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_LOOK_BEHIND_NOT_START:  MOP_IN(OP_LOOK_BEHIND_NOT_START);
+    case OP_LOOK_BEHIND_NOT_START:  SOP_IN(OP_LOOK_BEHIND_NOT_START);
       GET_RELADDR_INC(addr, p);
       GET_LENGTH_INC(tlen, p);
       q = (UChar* )ONIGENC_STEP_BACK(encode, str, s, (int )tlen);
@@ -2984,33 +3772,33 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
         s = q;
         sprev = (UChar* )onigenc_get_prev_char_head(encode, str, s);
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_LOOK_BEHIND_NOT_END:  MOP_IN(OP_LOOK_BEHIND_NOT_END);
+    case OP_LOOK_BEHIND_NOT_END:  SOP_IN(OP_LOOK_BEHIND_NOT_END);
       STACK_POP_TIL_ALT_LOOK_BEHIND_NOT;
       goto fail;
       break;
 
 #ifdef USE_CALL
-    case OP_CALL:  MOP_IN(OP_CALL);
+    case OP_CALL:  SOP_IN(OP_CALL);
       GET_ABSADDR_INC(addr, p);
       STACK_PUSH_CALL_FRAME(p);
       p = reg->p + addr;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_RETURN:  MOP_IN(OP_RETURN);
+    case OP_RETURN:  SOP_IN(OP_RETURN);
       STACK_RETURN(p);
       STACK_PUSH_RETURN;
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 #endif
 
-    case OP_PUSH_SAVE_VAL: MOP_IN(OP_PUSH_SAVE_VAL);
+    case OP_PUSH_SAVE_VAL: SOP_IN(OP_PUSH_SAVE_VAL);
       {
         SaveType type;
         GET_SAVE_TYPE_INC(type, p);
@@ -3029,11 +3817,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           break;
         }
       }
-      MOP_OUT;
+      SOP_OUT;
       continue;
       break;
 
-    case OP_UPDATE_VAR: MOP_IN(OP_UPDATE_VAR);
+    case OP_UPDATE_VAR: SOP_IN(OP_UPDATE_VAR);
       {
         UpdateVarType type;
         enum SaveType save_type;
@@ -3061,31 +3849,99 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
           break;
         }
       }
-      MOP_OUT;
+      SOP_OUT;
+      continue;
+      break;
+
+#ifdef USE_CALLOUT
+    case OP_CALLOUT_CONTENTS: SOP_IN(OP_CALLOUT_CONTENTS);
+      of = ONIG_CALLOUT_OF_CONTENTS;
+      goto callout_common_entry;
+
+      SOP_OUT;
       continue;
       break;
 
+    case OP_CALLOUT_NAME: SOP_IN(OP_CALLOUT_NAME);
+      {
+        int call_result;
+        int name_id;
+        int num;
+        int in;
+        CalloutListEntry* e;
+        OnigCalloutFunc func;
+        OnigCalloutArgs args;
+
+        of = ONIG_CALLOUT_OF_NAME;
+        GET_MEMNUM_INC(name_id, p);
+
+      callout_common_entry:
+        GET_MEMNUM_INC(num, p);
+        e = onig_reg_callout_list_at(reg, num);
+        in = e->in;
+        if (of == ONIG_CALLOUT_OF_NAME) {
+          func = onig_get_callout_start_func(reg, num);
+        }
+        else {
+          name_id = ONIG_NON_NAME_ID;
+          func = msa->mp->progress_callout_of_contents;
+        }
+
+        if (IS_NOT_NULL(func) && (in & ONIG_CALLOUT_IN_PROGRESS) != 0) {
+          CALLOUT_BODY(func, ONIG_CALLOUT_IN_PROGRESS, name_id,
+                       num, msa->mp->callout_user_data, args, call_result);
+          switch (call_result) {
+          case ONIG_CALLOUT_FAIL:
+            goto fail;
+            break;
+          case ONIG_CALLOUT_SUCCESS:
+            goto retraction_callout2;
+            break;
+          default: /* error code */
+            if (call_result > 0) {
+              call_result = ONIGERR_INVALID_ARGUMENT;
+            }
+            best_len = call_result;
+            goto finish;
+            break;
+          }
+        }
+        else {
+        retraction_callout2:
+          if ((in & ONIG_CALLOUT_IN_RETRACTION) != 0) {
+            if (of == ONIG_CALLOUT_OF_NAME) {
+              if (IS_NOT_NULL(func)) {
+                STACK_PUSH_CALLOUT_NAME(name_id, num, func);
+              }
+            }
+            else {
+              func = msa->mp->retraction_callout_of_contents;
+              if (IS_NOT_NULL(func)) {
+                STACK_PUSH_CALLOUT_CONTENTS(num, func);
+              }
+            }
+          }
+        }
+      }
+      SOP_OUT;
+      continue;
+      break;
+#endif
+
     case OP_FINISH:
       goto finish;
       break;
 
     fail:
-      MOP_OUT;
+      SOP_OUT;
       /* fall */
-    case OP_FAIL:  MOP_IN(OP_FAIL);
+    case OP_FAIL:  SOP_IN(OP_FAIL);
       STACK_POP;
       p     = stk->u.state.pcode;
       s     = stk->u.state.pstr;
       sprev = stk->u.state.pstr_prev;
-
-#ifdef USE_COMBINATION_EXPLOSION_CHECK
-      if (stk->u.state.state_check != 0) {
-        stk->type = STK_STATE_CHECK_MARK;
-        stk++;
-      }
-#endif
-
-      MOP_OUT;
+      CHECK_RETRY_LIMIT_IN_MATCH;
+      SOP_OUT;
       continue;
       break;
 
@@ -3113,6 +3969,12 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
  unexpected_bytecode_error:
   STACK_SAVE;
   return ONIGERR_UNEXPECTED_BYTECODE;
+
+#ifdef USE_RETRY_LIMIT_IN_MATCH
+ retry_limit_in_match_over:
+  STACK_SAVE;
+  return ONIGERR_RETRY_LIMIT_IN_MATCH_OVER;
+#endif
 }
 
 
@@ -3423,23 +4285,30 @@ map_search_backward(OnigEncoding enc, UChar map[],
   }
   return (UChar* )NULL;
 }
-
 extern int
 onig_match(regex_t* reg, const UChar* str, const UChar* end, const UChar* at,
            OnigRegion* region, OnigOptionType option)
 {
   int r;
-  UChar *prev;
-  OnigMatchArg msa;
+  OnigMatchParam mp;
 
-  MATCH_ARG_INIT(msa, reg, option, region, at);
-#ifdef USE_COMBINATION_EXPLOSION_CHECK
-  {
-    int offset = at - str;
-    STATE_CHECK_BUFF_INIT(msa, end - str, offset, reg->num_comb_exp_check);
-  }
-#endif
+  onig_initialize_match_param(&mp);
+  r = onig_match_with_param(reg, str, end, at, region, option, &mp);
+  onig_free_match_param_content(&mp);
+  return r;
+}
+
+extern int
+onig_match_with_param(regex_t* reg, const UChar* str, const UChar* end,
+                      const UChar* at, OnigRegion* region, OnigOptionType option,
+                      OnigMatchParam* mp)
+{
+  int r;
+  UChar *prev;
+  MatchArg msa;
 
+  ADJUST_MATCH_PARAM(reg, mp);
+  MATCH_ARG_INIT(msa, reg, option, region, at, mp);
   if (region
 #ifdef USE_POSIX_API_REGION_OPTION
       && !IS_POSIX_REGION(option)
@@ -3459,11 +4328,7 @@ onig_match(regex_t* reg, const UChar* str, const UChar* end, const UChar* at,
     }
 
     prev = (UChar* )onigenc_get_prev_char_head(reg->enc, str, at);
-    r = match_at(reg, str, end,
-#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
-                 end,
-#endif
-                 at, prev, &msa);
+    r = match_at(reg, str, end, end, at, prev, &msa);
   }
 
  end:
@@ -3497,23 +4362,23 @@ forward_search_range(regex_t* reg, const UChar* str, const UChar* end, UChar* s,
 
  retry:
   switch (reg->optimize) {
-  case ONIG_OPTIMIZE_EXACT:
+  case OPTIMIZE_EXACT:
     p = slow_search(reg->enc, reg->exact, reg->exact_end, p, end, range);
     break;
-  case ONIG_OPTIMIZE_EXACT_IC:
+  case OPTIMIZE_EXACT_IC:
     p = slow_search_ic(reg->enc, reg->case_fold_flag,
                        reg->exact, reg->exact_end, p, end, range);
     break;
 
-  case ONIG_OPTIMIZE_EXACT_BM:
+  case OPTIMIZE_EXACT_BM:
     p = bm_search(reg, reg->exact, reg->exact_end, p, end, range);
     break;
 
-  case ONIG_OPTIMIZE_EXACT_BM_NOT_REV:
+  case OPTIMIZE_EXACT_BM_NO_REV:
     p = bm_search_notrev(reg, reg->exact, reg->exact_end, p, end, range);
     break;
 
-  case ONIG_OPTIMIZE_MAP:
+  case OPTIMIZE_MAP:
     p = map_search(reg->enc, reg->map, p, range);
     break;
   }
@@ -3621,20 +4486,20 @@ backward_search_range(regex_t* reg, const UChar* str, const UChar* end,
 
  retry:
   switch (reg->optimize) {
-  case ONIG_OPTIMIZE_EXACT:
+  case OPTIMIZE_EXACT:
   exact_method:
     p = slow_search_backward(reg->enc, reg->exact, reg->exact_end,
                              range, adjrange, end, p);
     break;
 
-  case ONIG_OPTIMIZE_EXACT_IC:
+  case OPTIMIZE_EXACT_IC:
     p = slow_search_backward_ic(reg->enc, reg->case_fold_flag,
                                 reg->exact, reg->exact_end,
                                 range, adjrange, end, p);
     break;
 
-  case ONIG_OPTIMIZE_EXACT_BM:
-  case ONIG_OPTIMIZE_EXACT_BM_NOT_REV:
+  case OPTIMIZE_EXACT_BM:
+  case OPTIMIZE_EXACT_BM_NO_REV:
 #ifdef USE_INT_MAP_BACKWARD
     if (IS_NULL(reg->int_map_backward)) {
       int r;
@@ -3653,7 +4518,7 @@ backward_search_range(regex_t* reg, const UChar* str, const UChar* end,
 #endif
     break;
 
-  case ONIG_OPTIMIZE_MAP:
+  case OPTIMIZE_MAP:
     p = map_search_backward(reg->enc, reg->map, range, adjrange, p);
     break;
   }
@@ -3725,12 +4590,25 @@ onig_search(regex_t* reg, const UChar* str, const UChar* end,
             OnigOptionType option)
 {
   int r;
+  OnigMatchParam mp;
+
+  onig_initialize_match_param(&mp);
+  r = onig_search_with_param(reg, str, end, start, range, region, option, &mp);
+  onig_free_match_param_content(&mp);
+  return r;
+
+}
+
+extern int
+onig_search_with_param(regex_t* reg, const UChar* str, const UChar* end,
+                       const UChar* start, const UChar* range, OnigRegion* region,
+                       OnigOptionType option, OnigMatchParam* mp)
+{
+  int r;
   UChar *s, *prev;
-  OnigMatchArg msa;
+  MatchArg msa;
   const UChar *orig_start = start;
-#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
   const UChar *orig_range = range;
-#endif
 
 #ifdef ONIG_DEBUG_SEARCH
   fprintf(stderr,
@@ -3738,6 +4616,8 @@ onig_search(regex_t* reg, const UChar* str, const UChar* end,
      str, (int )(end - str), (int )(start - str), (int )(range - str));
 #endif
 
+  ADJUST_MATCH_PARAM(reg, mp);
+
   if (region
 #ifdef USE_POSIX_API_REGION_OPTION
       && !IS_POSIX_REGION(option)
@@ -3757,7 +4637,6 @@ onig_search(regex_t* reg, const UChar* str, const UChar* end,
   }
 
 
-#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
 #ifdef USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE
 #define MATCH_AND_RETURN_CHECK(upper_range) \
   r = match_at(reg, str, end, (upper_range), s, prev, &msa); \
@@ -3779,29 +4658,6 @@ onig_search(regex_t* reg, const UChar* str, const UChar* end,
     else goto finish; /* error */ \
   }
 #endif /* USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE */
-#else
-#ifdef USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE
-#define MATCH_AND_RETURN_CHECK(none) \
-  r = match_at(reg, str, end, s, prev, &msa);\
-  if (r != ONIG_MISMATCH) {\
-    if (r >= 0) {\
-      if (! IS_FIND_LONGEST(reg->options)) {\
-        goto match;\
-      }\
-    }\
-    else goto finish; /* error */ \
-  }
-#else
-#define MATCH_AND_RETURN_CHECK(none) \
-  r = match_at(reg, str, end, s, prev, &msa);\
-  if (r != ONIG_MISMATCH) {\
-    if (r >= 0) {\
-      goto match;\
-    }\
-    else goto finish; /* error */ \
-  }
-#endif /* USE_FIND_LONGEST_SEARCH_ALL_OF_RANGE */
-#endif /* USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE */
 
 
   /* anchor optimize: resume search range */
@@ -3886,7 +4742,7 @@ onig_search(regex_t* reg, const UChar* str, const UChar* end,
         goto end_buf;
       }
     }
-    else if ((reg->anchor & ANCHOR_ANYCHAR_STAR_ML)) {
+    else if ((reg->anchor & ANCHOR_ANYCHAR_INF_ML)) {
       goto begin_position;
     }
   }
@@ -3902,11 +4758,7 @@ onig_search(regex_t* reg, const UChar* str, const UChar* end,
       s = (UChar* )start;
       prev = (UChar* )NULL;
 
-      MATCH_ARG_INIT(msa, reg, option, region, start);
-#ifdef USE_COMBINATION_EXPLOSION_CHECK
-      msa.state_check_buff = (void* )0;
-      msa.state_check_buff_size = 0;   /* NO NEED, for valgrind */
-#endif
+      MATCH_ARG_INIT(msa, reg, option, region, start, mp);
       MATCH_AND_RETURN_CHECK(end);
       goto mismatch;
     }
@@ -3918,13 +4770,7 @@ onig_search(regex_t* reg, const UChar* str, const UChar* end,
           (int )(end - str), (int )(start - str), (int )(range - str));
 #endif
 
-  MATCH_ARG_INIT(msa, reg, option, region, orig_start);
-#ifdef USE_COMBINATION_EXPLOSION_CHECK
-  {
-    int offset = (MIN(start, range) - str);
-    STATE_CHECK_BUFF_INIT(msa, end - str, offset, reg->num_comb_exp_check);
-  }
-#endif
+  MATCH_ARG_INIT(msa, reg, option, region, orig_start, mp);
 
   s = (UChar* )start;
   if (range > start) {   /* forward search */
@@ -3933,7 +4779,7 @@ onig_search(regex_t* reg, const UChar* str, const UChar* end,
     else
       prev = (UChar* )NULL;
 
-    if (reg->optimize != ONIG_OPTIMIZE_NONE) {
+    if (reg->optimize != OPTIMIZE_NONE) {
       UChar *sch_range, *low, *high, *low_prev;
 
       sch_range = (UChar* )range;
@@ -3969,7 +4815,7 @@ onig_search(regex_t* reg, const UChar* str, const UChar* end,
         if (! forward_search_range(reg, str, end, s, sch_range,
                                    &low, &high, (UChar** )NULL)) goto mismatch;
 
-        if ((reg->anchor & ANCHOR_ANYCHAR_STAR) != 0) {
+        if ((reg->anchor & ANCHOR_ANYCHAR_INF) != 0) {
           do {
             MATCH_AND_RETURN_CHECK(orig_range);
             prev = s;
@@ -3998,12 +4844,10 @@ onig_search(regex_t* reg, const UChar* str, const UChar* end,
     }
   }
   else {  /* backward search */
-#ifdef USE_MATCH_RANGE_MUST_BE_INSIDE_OF_SPECIFIED_RANGE
     if (orig_start < end)
       orig_start += enclen(reg->enc, orig_start); /* is upper range */
-#endif
 
-    if (reg->optimize != ONIG_OPTIMIZE_NONE) {
+    if (reg->optimize != OPTIMIZE_NONE) {
       UChar *low, *high, *adjrange, *sch_start;
 
       if (range < end)
@@ -4204,3 +5048,600 @@ onig_copy_encoding(OnigEncoding to, OnigEncoding from)
   *to = *from;
 }
 
+
+/* for callout functions */
+
+#ifdef USE_CALLOUT
+
+extern OnigCalloutFunc
+onig_get_progress_callout(void)
+{
+  return DefaultProgressCallout;
+}
+
+extern int
+onig_set_progress_callout(OnigCalloutFunc f)
+{
+  DefaultProgressCallout = f;
+  return ONIG_NORMAL;
+}
+
+extern OnigCalloutFunc
+onig_get_retraction_callout(void)
+{
+  return DefaultRetractionCallout;
+}
+
+extern int
+onig_set_retraction_callout(OnigCalloutFunc f)
+{
+  DefaultRetractionCallout = f;
+  return ONIG_NORMAL;
+}
+
+extern int
+onig_get_callout_num_by_callout_args(OnigCalloutArgs* args)
+{
+  return args->num;
+}
+
+extern OnigCalloutIn
+onig_get_callout_in_by_callout_args(OnigCalloutArgs* args)
+{
+  return args->in;
+}
+
+extern int
+onig_get_name_id_by_callout_args(OnigCalloutArgs* args)
+{
+  return args->name_id;
+}
+
+extern const UChar*
+onig_get_contents_by_callout_args(OnigCalloutArgs* args)
+{
+  int num;
+  CalloutListEntry* e;
+
+  num = args->num;
+  e = onig_reg_callout_list_at(args->regex, num);
+  if (IS_NULL(e)) return 0;
+  if (e->of == ONIG_CALLOUT_OF_CONTENTS) {
+    return e->u.content.start;
+  }
+
+  return 0;
+}
+
+extern const UChar*
+onig_get_contents_end_by_callout_args(OnigCalloutArgs* args)
+{
+  int num;
+  CalloutListEntry* e;
+
+  num = args->num;
+  e = onig_reg_callout_list_at(args->regex, num);
+  if (IS_NULL(e)) return 0;
+  if (e->of == ONIG_CALLOUT_OF_CONTENTS) {
+    return e->u.content.end;
+  }
+
+  return 0;
+}
+
+extern int
+onig_get_args_num_by_callout_args(OnigCalloutArgs* args)
+{
+  int num;
+  CalloutListEntry* e;
+
+  num = args->num;
+  e = onig_reg_callout_list_at(args->regex, num);
+  if (IS_NULL(e)) return 0;
+  if (e->of == ONIG_CALLOUT_OF_NAME) {
+    return e->u.arg.num;
+  }
+
+  return ONIGERR_INVALID_ARGUMENT;
+}
+
+extern int
+onig_get_passed_args_num_by_callout_args(OnigCalloutArgs* args)
+{
+  int num;
+  CalloutListEntry* e;
+
+  num = args->num;
+  e = onig_reg_callout_list_at(args->regex, num);
+  if (IS_NULL(e)) return 0;
+  if (e->of == ONIG_CALLOUT_OF_NAME) {
+    return e->u.arg.passed_num;
+  }
+
+  return ONIGERR_INVALID_ARGUMENT;
+}
+
+extern int
+onig_get_arg_by_callout_args(OnigCalloutArgs* args, int index,
+                             OnigType* type, OnigValue* val)
+{
+  int num;
+  CalloutListEntry* e;
+
+  num = args->num;
+  e = onig_reg_callout_list_at(args->regex, num);
+  if (IS_NULL(e)) return 0;
+  if (e->of == ONIG_CALLOUT_OF_NAME) {
+    if (IS_NOT_NULL(type)) *type = e->u.arg.types[index];
+    if (IS_NOT_NULL(val))  *val  = e->u.arg.vals[index];
+    return ONIG_NORMAL;
+  }
+
+  return ONIGERR_INVALID_ARGUMENT;
+}
+
+extern const UChar*
+onig_get_string_by_callout_args(OnigCalloutArgs* args)
+{
+  return args->string;
+}
+
+extern const UChar*
+onig_get_string_end_by_callout_args(OnigCalloutArgs* args)
+{
+  return args->string_end;
+}
+
+extern const UChar*
+onig_get_start_by_callout_args(OnigCalloutArgs* args)
+{
+  return args->start;
+}
+
+extern const UChar*
+onig_get_right_range_by_callout_args(OnigCalloutArgs* args)
+{
+  return args->right_range;
+}
+
+extern const UChar*
+onig_get_current_by_callout_args(OnigCalloutArgs* args)
+{
+  return args->current;
+}
+
+extern OnigRegex
+onig_get_regex_by_callout_args(OnigCalloutArgs* args)
+{
+  return args->regex;
+}
+
+extern unsigned long
+onig_get_retry_counter_by_callout_args(OnigCalloutArgs* args)
+{
+  return args->retry_in_match_counter;
+}
+
+
+extern int
+onig_get_capture_range_in_callout(OnigCalloutArgs* a, int mem_num, int* begin, int* end)
+{
+  OnigRegex    reg;
+  const UChar* str;
+  StackType*   stk_base;
+  int i;
+
+  i = mem_num;
+  reg = a->regex;
+  str = a->string;
+  stk_base = a->stk_base;
+
+  if (i > 0) {
+    if (a->mem_end_stk[i] != INVALID_STACK_INDEX) {
+      if (MEM_STATUS_AT(reg->bt_mem_start, i))
+        *begin = (int )(STACK_AT(a->mem_start_stk[i])->u.mem.pstr - str);
+      else
+        *begin = (int )((UChar* )((void* )a->mem_start_stk[i]) - str);
+
+      *end = (int )((MEM_STATUS_AT(reg->bt_mem_end, i)
+                     ? STACK_AT(a->mem_end_stk[i])->u.mem.pstr
+                     : (UChar* )((void* )a->mem_end_stk[i])) - str);
+    }
+    else {
+      *begin = *end = ONIG_REGION_NOTPOS;
+    }
+  }
+  else if (i == 0) {
+#if 0
+    *begin = a->start   - str;
+    *end   = a->current - str;
+#else
+    return ONIGERR_INVALID_ARGUMENT;
+#endif
+  }
+  else
+    return ONIGERR_INVALID_ARGUMENT;
+
+  return ONIG_NORMAL;
+}
+
+extern int
+onig_get_used_stack_size_in_callout(OnigCalloutArgs* a, int* used_num, int* used_bytes)
+{
+  int n;
+
+  n = (int )(a->stk - a->stk_base);
+
+  if (used_num != 0)
+    *used_num = n;
+
+  if (used_bytes != 0)
+    *used_bytes = n * sizeof(StackType);
+
+  return ONIG_NORMAL;
+}
+
+
+/* builtin callout functions */
+
+extern int
+onig_builtin_fail(OnigCalloutArgs* args ARG_UNUSED, void* user_data ARG_UNUSED)
+{
+  return ONIG_CALLOUT_FAIL;
+}
+
+extern int
+onig_builtin_mismatch(OnigCalloutArgs* args ARG_UNUSED, void* user_data ARG_UNUSED)
+{
+  return ONIG_MISMATCH;
+}
+
+#if 0
+extern int
+onig_builtin_success(OnigCalloutArgs* args ARG_UNUSED, void* user_data ARG_UNUSED)
+{
+  return ONIG_CALLOUT_SUCCESS;
+}
+#endif
+
+extern int
+onig_builtin_error(OnigCalloutArgs* args, void* user_data ARG_UNUSED)
+{
+  int r;
+  int n;
+  OnigValue val;
+
+  r = onig_get_arg_by_callout_args(args, 0, 0, &val);
+  if (r != ONIG_NORMAL) return r;
+
+  n = (int )val.l;
+  if (n >= 0) {
+    n = ONIGERR_INVALID_CALLOUT_BODY;
+  }
+
+  return n;
+}
+
+extern int
+onig_builtin_count(OnigCalloutArgs* args, void* user_data)
+{
+  (void )onig_check_callout_data_and_clear_old_values(args);
+
+  return onig_builtin_total_count(args, user_data);
+}
+
+extern int
+onig_builtin_total_count(OnigCalloutArgs* args, void* user_data ARG_UNUSED)
+{
+  int r;
+  int slot;
+  OnigType  type;
+  OnigValue val;
+  OnigValue aval;
+  OnigCodePoint count_type;
+
+  r = onig_get_arg_by_callout_args(args, 0, &type, &aval);
+  if (r != ONIG_NORMAL) return r;
+
+  count_type = aval.c;
+  if (count_type != '>' && count_type != 'X' && count_type != '<')
+    return ONIGERR_INVALID_CALLOUT_ARG;
+
+  r = onig_get_callout_data_by_callout_args_self_dont_clear_old(args, 0,
+                                                                &type, &val);
+  if (r < ONIG_NORMAL)
+    return r;
+  else if (r > ONIG_NORMAL) {
+    /* type == void: initial state */
+    val.l = 0;
+  }
+
+  if (args->in == ONIG_CALLOUT_IN_RETRACTION) {
+    slot = 2;
+    if (count_type == '<')
+      val.l++;
+    else if (count_type == 'X')
+      val.l--;
+  }
+  else {
+    slot = 1;
+    if (count_type != '<')
+      val.l++;
+  }
+
+  r = onig_set_callout_data_by_callout_args_self(args, 0, ONIG_TYPE_LONG, &val);
+  if (r != ONIG_NORMAL) return r;
+
+  /* slot 1: in progress counter, slot 2: in retraction counter */
+  r = onig_get_callout_data_by_callout_args_self_dont_clear_old(args, slot,
+                                                                &type, &val);
+  if (r < ONIG_NORMAL)
+    return r;
+  else if (r > ONIG_NORMAL) {
+    val.l = 0;
+  }
+
+  val.l++;
+  r = onig_set_callout_data_by_callout_args_self(args, slot, ONIG_TYPE_LONG, &val);
+  if (r != ONIG_NORMAL) return r;
+
+  return ONIG_CALLOUT_SUCCESS;
+}
+
+extern int
+onig_builtin_max(OnigCalloutArgs* args, void* user_data ARG_UNUSED)
+{
+  int r;
+  int slot;
+  OnigType  type;
+  OnigValue val;
+  OnigValue aval;
+
+  (void )onig_check_callout_data_and_clear_old_values(args);
+
+  slot = 0;
+  r = onig_get_callout_data_by_callout_args_self(args, slot, &type, &val);
+  if (r < ONIG_NORMAL)
+    return r;
+  else if (r > ONIG_NORMAL) {
+    /* type == void: initial state */
+    type  = ONIG_TYPE_LONG;
+    val.l = 0;
+  }
+
+  r = onig_get_arg_by_callout_args(args, 0, &type, &aval);
+  if (r != ONIG_NORMAL) return r;
+
+  if (args->in == ONIG_CALLOUT_IN_RETRACTION) {
+    val.l--;
+  }
+  else {
+    if (val.l >= aval.l) return ONIG_CALLOUT_FAIL;
+    val.l++;
+  }
+
+  r = onig_set_callout_data_by_callout_args_self(args, slot, ONIG_TYPE_LONG, &val);
+  if (r != ONIG_NORMAL) return r;
+
+  return ONIG_CALLOUT_SUCCESS;
+}
+
+enum OP_CMP {
+  OP_EQ,
+  OP_NE,
+  OP_LT,
+  OP_GT,
+  OP_LE,
+  OP_GE
+};
+
+extern int
+onig_builtin_cmp(OnigCalloutArgs* args, void* user_data ARG_UNUSED)
+{
+  int r;
+  int slot;
+  long lv;
+  long rv;
+  OnigType  type;
+  OnigValue val;
+  regex_t* reg;
+  enum OP_CMP op;
+
+  reg = args->regex;
+
+  r = onig_get_arg_by_callout_args(args, 0, &type, &val);
+  if (r != ONIG_NORMAL) return r;
+
+  if (type == ONIG_TYPE_TAG) {
+    r = onig_get_callout_data_by_callout_args(args, val.tag, 0, &type, &val);
+    if (r < ONIG_NORMAL) return r;
+    else if (r > ONIG_NORMAL)
+      lv = 0L;
+    else
+      lv = val.l;
+  }
+  else { /* ONIG_TYPE_LONG */
+    lv = val.l;
+  }
+
+  r = onig_get_arg_by_callout_args(args, 2, &type, &val);
+  if (r != ONIG_NORMAL) return r;
+
+  if (type == ONIG_TYPE_TAG) {
+    r = onig_get_callout_data_by_callout_args(args, val.tag, 0, &type, &val);
+    if (r < ONIG_NORMAL) return r;
+    else if (r > ONIG_NORMAL)
+      rv = 0L;
+    else
+      rv = val.l;
+  }
+  else { /* ONIG_TYPE_LONG */
+    rv = val.l;
+  }
+
+  slot = 0;
+  r = onig_get_callout_data_by_callout_args_self(args, slot, &type, &val);
+  if (r < ONIG_NORMAL)
+    return r;
+  else if (r > ONIG_NORMAL) {
+    /* type == void: initial state */
+    OnigCodePoint c1, c2;
+    UChar* p;
+
+    r = onig_get_arg_by_callout_args(args, 1, &type, &val);
+    if (r != ONIG_NORMAL) return r;
+
+    p = val.s.start;
+    c1 = ONIGENC_MBC_TO_CODE(reg->enc, p, val.s.end);
+    p += ONIGENC_MBC_ENC_LEN(reg->enc, p);
+    if (p < val.s.end) {
+      c2 = ONIGENC_MBC_TO_CODE(reg->enc, p, val.s.end);
+      p += ONIGENC_MBC_ENC_LEN(reg->enc, p);
+      if (p != val.s.end)  return ONIGERR_INVALID_CALLOUT_ARG;
+    }
+    else
+      c2 = 0;
+
+    switch (c1) {
+    case '=':
+      if (c2 != '=') return ONIGERR_INVALID_CALLOUT_ARG;
+      op = OP_EQ;
+      break;
+    case '!':
+      if (c2 != '=') return ONIGERR_INVALID_CALLOUT_ARG;
+      op = OP_NE;
+      break;
+    case '<':
+      if (c2 == '=') op = OP_LE;
+      else if (c2 == 0) op = OP_LT;
+      else  return ONIGERR_INVALID_CALLOUT_ARG;
+      break;
+    case '>':
+      if (c2 == '=') op = OP_GE;
+      else if (c2 == 0) op = OP_GT;
+      else  return ONIGERR_INVALID_CALLOUT_ARG;
+      break;
+    default:
+      return ONIGERR_INVALID_CALLOUT_ARG;
+      break;
+    }
+    val.l = (long )op;
+    r = onig_set_callout_data_by_callout_args_self(args, slot, ONIG_TYPE_LONG, &val);
+    if (r != ONIG_NORMAL) return r;
+  }
+  else {
+    op = (enum OP_CMP )val.l;
+  }
+
+  switch (op) {
+  case OP_EQ: r = (lv == rv); break;
+  case OP_NE: r = (lv != rv); break;
+  case OP_LT: r = (lv <  rv); break;
+  case OP_GT: r = (lv >  rv); break;
+  case OP_LE: r = (lv <= rv); break;
+  case OP_GE: r = (lv >= rv); break;
+  }
+
+  return r == 0 ? ONIG_CALLOUT_FAIL : ONIG_CALLOUT_SUCCESS;
+}
+
+
+#include <stdio.h>
+
+static FILE* OutFp;
+
+/* name start with "onig_" for macros. */
+static int
+onig_builtin_monitor(OnigCalloutArgs* args, void* user_data)
+{
+  int r;
+  int num;
+  size_t tag_len;
+  const UChar* start;
+  const UChar* right;
+  const UChar* current;
+  const UChar* string;
+  const UChar* strend;
+  const UChar* tag_start;
+  const UChar* tag_end;
+  regex_t* reg;
+  OnigCalloutIn in;
+  OnigType type;
+  OnigValue val;
+  char buf[20];
+  FILE* fp;
+
+  fp = OutFp;
+
+  r = onig_get_arg_by_callout_args(args, 0, &type, &val);
+  if (r != ONIG_NORMAL) return r;
+
+  in = onig_get_callout_in_by_callout_args(args);
+  if (in == ONIG_CALLOUT_IN_PROGRESS) {
+    if (val.c == '<')
+      return ONIG_CALLOUT_SUCCESS;
+  }
+  else {
+    if (val.c != 'X' && val.c != '<')
+      return ONIG_CALLOUT_SUCCESS;
+  }
+
+  num       = onig_get_callout_num_by_callout_args(args);
+  start     = onig_get_start_by_callout_args(args);
+  right     = onig_get_right_range_by_callout_args(args);
+  current   = onig_get_current_by_callout_args(args);
+  string    = onig_get_string_by_callout_args(args);
+  strend    = onig_get_string_end_by_callout_args(args);
+  reg       = onig_get_regex_by_callout_args(args);
+  tag_start = onig_get_callout_tag_start(reg, num);
+  tag_end   = onig_get_callout_tag_end(reg, num);
+
+  if (tag_start == 0)
+    xsnprintf(buf, sizeof(buf), "#%d", num);
+  else {
+    /* CAUTION: tag string is not terminated with NULL. */
+    int i;
+
+    tag_len = tag_end - tag_start;
+    if (tag_len >= sizeof(buf)) tag_len = sizeof(buf) - 1;
+    for (i = 0; i < tag_len; i++) buf[i] = tag_start[i];
+    buf[tag_len] = '\0';
+  }
+
+  fprintf(fp, "ONIG-MONITOR: %-4s %s at: %d [%d - %d] len: %d\n",
+          buf,
+          in == ONIG_CALLOUT_IN_PROGRESS ? "=>" : "<=",
+          (int )(current - string),
+          (int )(start   - string),
+          (int )(right   - string),
+          (int )(strend  - string));
+  fflush(fp);
+
+  return ONIG_CALLOUT_SUCCESS;
+}
+
+extern int
+onig_setup_builtin_monitors_by_ascii_encoded_name(void* fp /* FILE* */)
+{
+  int id;
+  char* name;
+  OnigEncoding enc;
+  unsigned int ts[4];
+  OnigValue opts[4];
+
+  if (IS_NOT_NULL(fp))
+    OutFp = (FILE* )fp;
+  else
+    OutFp = stdout;
+
+  enc = ONIG_ENCODING_ASCII;
+
+  name = "MON";
+  ts[0] = ONIG_TYPE_CHAR;
+  opts[0].c = '>';
+  BC_B_O(name, monitor, 1, ts, 1, opts);
+
+  return ONIG_NORMAL;
+}
+
+#endif /* USE_CALLOUT */