/[pcre]/code/trunk/pcre_compile.c
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Diff of /code/trunk/pcre_compile.c

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revision 598 by ph10, Sat May 7 15:37:31 2011 UTC revision 602 by ph10, Wed May 25 08:29:03 2011 UTC
# Line 1397  return rc; Line 1397  return rc;
1397    
1398  /* This is called by several functions that scan a compiled expression looking  /* This is called by several functions that scan a compiled expression looking
1399  for a fixed first character, or an anchoring op code etc. It skips over things  for a fixed first character, or an anchoring op code etc. It skips over things
1400  that do not influence this. For some calls, a change of option is important.  that do not influence this. For some calls, it makes sense to skip negative
1401  For some calls, it makes sense to skip negative forward and all backward  forward and all backward assertions, and also the \b assertion; for others it
1402  assertions, and also the \b assertion; for others it does not.  does not.
1403    
1404  Arguments:  Arguments:
1405    code         pointer to the start of the group    code         pointer to the start of the group
# Line 1419  for (;;) Line 1419  for (;;)
1419    {    {
1420    switch ((int)*code)    switch ((int)*code)
1421      {      {
     case OP_OPT:  
     if (optbit > 0 && ((int)code[1] & optbit) != (*options & optbit))  
       *options = (int)code[1];  
     code += 2;  
     break;  
   
1422      case OP_ASSERT_NOT:      case OP_ASSERT_NOT:
1423      case OP_ASSERTBACK:      case OP_ASSERTBACK:
1424      case OP_ASSERTBACK_NOT:      case OP_ASSERTBACK_NOT:
# Line 1561  for (;;) Line 1555  for (;;)
1555      case OP_RREF:      case OP_RREF:
1556      case OP_NRREF:      case OP_NRREF:
1557      case OP_DEF:      case OP_DEF:
     case OP_OPT:  
1558      case OP_CALLOUT:      case OP_CALLOUT:
1559      case OP_SOD:      case OP_SOD:
1560      case OP_SOM:      case OP_SOM:
# Line 1569  for (;;) Line 1562  for (;;)
1562      case OP_EOD:      case OP_EOD:
1563      case OP_EODN:      case OP_EODN:
1564      case OP_CIRC:      case OP_CIRC:
1565        case OP_CIRCM:
1566      case OP_DOLL:      case OP_DOLL:
1567        case OP_DOLLM:
1568      case OP_NOT_WORD_BOUNDARY:      case OP_NOT_WORD_BOUNDARY:
1569      case OP_WORD_BOUNDARY:      case OP_WORD_BOUNDARY:
1570      cc += _pcre_OP_lengths[*cc];      cc += _pcre_OP_lengths[*cc];
# Line 1578  for (;;) Line 1573  for (;;)
1573      /* Handle literal characters */      /* Handle literal characters */
1574    
1575      case OP_CHAR:      case OP_CHAR:
1576      case OP_CHARNC:      case OP_CHARI:
1577      case OP_NOT:      case OP_NOT:
1578        case OP_NOTI:
1579      branchlength++;      branchlength++;
1580      cc += 2;      cc += 2;
1581  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
# Line 1774  for (;;) Line 1770  for (;;)
1770      if (utf8) switch(c)      if (utf8) switch(c)
1771        {        {
1772        case OP_CHAR:        case OP_CHAR:
1773        case OP_CHARNC:        case OP_CHARI:
1774        case OP_EXACT:        case OP_EXACT:
1775          case OP_EXACTI:
1776        case OP_UPTO:        case OP_UPTO:
1777          case OP_UPTOI:
1778        case OP_MINUPTO:        case OP_MINUPTO:
1779          case OP_MINUPTOI:
1780        case OP_POSUPTO:        case OP_POSUPTO:
1781          case OP_POSUPTOI:
1782        case OP_STAR:        case OP_STAR:
1783          case OP_STARI:
1784        case OP_MINSTAR:        case OP_MINSTAR:
1785          case OP_MINSTARI:
1786        case OP_POSSTAR:        case OP_POSSTAR:
1787          case OP_POSSTARI:
1788        case OP_PLUS:        case OP_PLUS:
1789          case OP_PLUSI:
1790        case OP_MINPLUS:        case OP_MINPLUS:
1791          case OP_MINPLUSI:
1792        case OP_POSPLUS:        case OP_POSPLUS:
1793          case OP_POSPLUSI:
1794        case OP_QUERY:        case OP_QUERY:
1795          case OP_QUERYI:
1796        case OP_MINQUERY:        case OP_MINQUERY:
1797          case OP_MINQUERYI:
1798        case OP_POSQUERY:        case OP_POSQUERY:
1799          case OP_POSQUERYI:
1800        if (code[-1] >= 0xc0) code += _pcre_utf8_table4[code[-1] & 0x3f];        if (code[-1] >= 0xc0) code += _pcre_utf8_table4[code[-1] & 0x3f];
1801        break;        break;
1802        }        }
# Line 1880  for (;;) Line 1889  for (;;)
1889      if (utf8) switch(c)      if (utf8) switch(c)
1890        {        {
1891        case OP_CHAR:        case OP_CHAR:
1892        case OP_CHARNC:        case OP_CHARI:
1893        case OP_EXACT:        case OP_EXACT:
1894          case OP_EXACTI:
1895        case OP_UPTO:        case OP_UPTO:
1896          case OP_UPTOI:
1897        case OP_MINUPTO:        case OP_MINUPTO:
1898          case OP_MINUPTOI:
1899        case OP_POSUPTO:        case OP_POSUPTO:
1900          case OP_POSUPTOI:
1901        case OP_STAR:        case OP_STAR:
1902          case OP_STARI:
1903        case OP_MINSTAR:        case OP_MINSTAR:
1904          case OP_MINSTARI:
1905        case OP_POSSTAR:        case OP_POSSTAR:
1906          case OP_POSSTARI:
1907        case OP_PLUS:        case OP_PLUS:
1908          case OP_PLUSI:
1909        case OP_MINPLUS:        case OP_MINPLUS:
1910          case OP_MINPLUSI:
1911        case OP_POSPLUS:        case OP_POSPLUS:
1912          case OP_POSPLUSI:
1913        case OP_QUERY:        case OP_QUERY:
1914          case OP_QUERYI:
1915        case OP_MINQUERY:        case OP_MINQUERY:
1916          case OP_MINQUERYI:
1917        case OP_POSQUERY:        case OP_POSQUERY:
1918          case OP_POSQUERYI:
1919        if (code[-1] >= 0xc0) code += _pcre_utf8_table4[code[-1] & 0x3f];        if (code[-1] >= 0xc0) code += _pcre_utf8_table4[code[-1] & 0x3f];
1920        break;        break;
1921        }        }
# Line 2071  for (code = first_significant_code(code Line 2093  for (code = first_significant_code(code
2093      case OP_ALLANY:      case OP_ALLANY:
2094      case OP_ANYBYTE:      case OP_ANYBYTE:
2095      case OP_CHAR:      case OP_CHAR:
2096      case OP_CHARNC:      case OP_CHARI:
2097      case OP_NOT:      case OP_NOT:
2098        case OP_NOTI:
2099      case OP_PLUS:      case OP_PLUS:
2100      case OP_MINPLUS:      case OP_MINPLUS:
2101      case OP_POSPLUS:      case OP_POSPLUS:
# Line 2120  for (code = first_significant_code(code Line 2143  for (code = first_significant_code(code
2143    
2144  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
2145      case OP_STAR:      case OP_STAR:
2146        case OP_STARI:
2147      case OP_MINSTAR:      case OP_MINSTAR:
2148        case OP_MINSTARI:
2149      case OP_POSSTAR:      case OP_POSSTAR:
2150        case OP_POSSTARI:
2151      case OP_QUERY:      case OP_QUERY:
2152        case OP_QUERYI:
2153      case OP_MINQUERY:      case OP_MINQUERY:
2154        case OP_MINQUERYI:
2155      case OP_POSQUERY:      case OP_POSQUERY:
2156        case OP_POSQUERYI:
2157      if (utf8 && code[1] >= 0xc0) code += _pcre_utf8_table4[code[1] & 0x3f];      if (utf8 && code[1] >= 0xc0) code += _pcre_utf8_table4[code[1] & 0x3f];
2158      break;      break;
2159    
2160      case OP_UPTO:      case OP_UPTO:
2161        case OP_UPTOI:
2162      case OP_MINUPTO:      case OP_MINUPTO:
2163        case OP_MINUPTOI:
2164      case OP_POSUPTO:      case OP_POSUPTO:
2165        case OP_POSUPTOI:
2166      if (utf8 && code[3] >= 0xc0) code += _pcre_utf8_table4[code[3] & 0x3f];      if (utf8 && code[3] >= 0xc0) code += _pcre_utf8_table4[code[3] & 0x3f];
2167      break;      break;
2168  #endif  #endif
# Line 2622  if (next >= 0) switch(op_code) Line 2654  if (next >= 0) switch(op_code)
2654  #endif  #endif
2655    return c != next;    return c != next;
2656    
2657    /* For CHARNC (caseless character) we must check the other case. If we have    /* For CHARI (caseless character) we must check the other case. If we have
2658    Unicode property support, we can use it to test the other case of    Unicode property support, we can use it to test the other case of
2659    high-valued characters. */    high-valued characters. */
2660    
2661    case OP_CHARNC:    case OP_CHARI:
2662  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
2663    GETCHARTEST(c, previous);    GETCHARTEST(c, previous);
2664  #else  #else
# Line 2649  if (next >= 0) switch(op_code) Line 2681  if (next >= 0) switch(op_code)
2681  #endif  /* SUPPORT_UTF8 */  #endif  /* SUPPORT_UTF8 */
2682    return (c != cd->fcc[next]);  /* Non-UTF-8 mode */    return (c != cd->fcc[next]);  /* Non-UTF-8 mode */
2683    
2684    /* For OP_NOT, its data is always a single-byte character. */    /* For OP_NOT and OP_NOTI, the data is always a single-byte character. These
2685      opcodes are not used for multi-byte characters, because they are coded using
2686      an XCLASS instead. */
2687    
2688    case OP_NOT:    case OP_NOT:
2689      return (c = *previous) == next;
2690    
2691      case OP_NOTI:
2692    if ((c = *previous) == next) return TRUE;    if ((c = *previous) == next) return TRUE;
   if ((options & PCRE_CASELESS) == 0) return FALSE;  
2693  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
2694    if (utf8)    if (utf8)
2695      {      {
# Line 2758  replaced by OP_PROP codes when PCRE_UCP Line 2794  replaced by OP_PROP codes when PCRE_UCP
2794  switch(op_code)  switch(op_code)
2795    {    {
2796    case OP_CHAR:    case OP_CHAR:
2797    case OP_CHARNC:    case OP_CHARI:
2798  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
2799    GETCHARTEST(c, previous);    GETCHARTEST(c, previous);
2800  #else  #else
# Line 3222  for (;; ptr++) Line 3258  for (;; ptr++)
3258      the setting of any following char as a first character. */      the setting of any following char as a first character. */
3259    
3260      case CHAR_CIRCUMFLEX_ACCENT:      case CHAR_CIRCUMFLEX_ACCENT:
3261        previous = NULL;
3262      if ((options & PCRE_MULTILINE) != 0)      if ((options & PCRE_MULTILINE) != 0)
3263        {        {
3264        if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;        if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;
3265          *code++ = OP_CIRCM;
3266        }        }
3267      previous = NULL;      else *code++ = OP_CIRC;
     *code++ = OP_CIRC;  
3268      break;      break;
3269    
3270      case CHAR_DOLLAR_SIGN:      case CHAR_DOLLAR_SIGN:
3271      previous = NULL;      previous = NULL;
3272      *code++ = OP_DOLL;      *code++ = ((options & PCRE_MULTILINE) != 0)? OP_DOLLM : OP_DOLL;
3273      break;      break;
3274    
3275      /* There can never be a first char if '.' is first, whatever happens about      /* There can never be a first char if '.' is first, whatever happens about
# Line 3978  for (;; ptr++) Line 4015  for (;; ptr++)
4015    
4016      In UTF-8 mode, we can optimize the negative case only if there were no      In UTF-8 mode, we can optimize the negative case only if there were no
4017      characters >= 128 because OP_NOT and the related opcodes like OP_NOTSTAR      characters >= 128 because OP_NOT and the related opcodes like OP_NOTSTAR
4018      operate on single-bytes only. This is an historical hangover. Maybe one day      operate on single-bytes characters only. This is an historical hangover.
4019      we can tidy these opcodes to handle multi-byte characters.      Maybe one day we can tidy these opcodes to handle multi-byte characters.
4020    
4021      The optimization throws away the bit map. We turn the item into a      The optimization throws away the bit map. We turn the item into a
4022      1-character OP_CHAR[NC] if it's positive, or OP_NOT if it's negative. Note      1-character OP_CHAR[I] if it's positive, or OP_NOT[I] if it's negative.
4023      that OP_NOT does not support multibyte characters. In the positive case, it      Note that OP_NOT[I] does not support multibyte characters. In the positive
4024      can cause firstbyte to be set. Otherwise, there can be no first char if      case, it can cause firstbyte to be set. Otherwise, there can be no first
4025      this item is first, whatever repeat count may follow. In the case of      char if this item is first, whatever repeat count may follow. In the case
4026      reqbyte, save the previous value for reinstating. */      of reqbyte, save the previous value for reinstating. */
4027    
4028  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
4029      if (class_charcount == 1 && !class_utf8 &&      if (class_charcount == 1 && !class_utf8 &&
# Line 3997  for (;; ptr++) Line 4034  for (;; ptr++)
4034        {        {
4035        zeroreqbyte = reqbyte;        zeroreqbyte = reqbyte;
4036    
4037        /* The OP_NOT opcode works on one-byte characters only. */        /* The OP_NOT[I] opcodes work on one-byte characters only. */
4038    
4039        if (negate_class)        if (negate_class)
4040          {          {
4041          if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;          if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;
4042          zerofirstbyte = firstbyte;          zerofirstbyte = firstbyte;
4043          *code++ = OP_NOT;          *code++ = ((options & PCRE_CASELESS) != 0)? OP_NOTI: OP_NOT;
4044          *code++ = class_lastchar;          *code++ = class_lastchar;
4045          break;          break;
4046          }          }
# Line 4161  for (;; ptr++) Line 4198  for (;; ptr++)
4198      the first thing in a branch because the x will have gone into firstbyte      the first thing in a branch because the x will have gone into firstbyte
4199      instead.  */      instead.  */
4200    
4201      if (*previous == OP_CHAR || *previous == OP_CHARNC)      if (*previous == OP_CHAR || *previous == OP_CHARI)
4202        {        {
4203          op_type = (*previous == OP_CHAR)? 0 : OP_STARI - OP_STAR;
4204    
4205        /* Deal with UTF-8 characters that take up more than one byte. It's        /* Deal with UTF-8 characters that take up more than one byte. It's
4206        easier to write this out separately than try to macrify it. Use c to        easier to write this out separately than try to macrify it. Use c to
4207        hold the length of the character in bytes, plus 0x80 to flag that it's a        hold the length of the character in bytes, plus 0x80 to flag that it's a
# Line 4207  for (;; ptr++) Line 4246  for (;; ptr++)
4246      /* If previous was a single negated character ([^a] or similar), we use      /* If previous was a single negated character ([^a] or similar), we use
4247      one of the special opcodes, replacing it. The code is shared with single-      one of the special opcodes, replacing it. The code is shared with single-
4248      character repeats by setting opt_type to add a suitable offset into      character repeats by setting opt_type to add a suitable offset into
4249      repeat_type. We can also test for auto-possessification. OP_NOT is      repeat_type. We can also test for auto-possessification. OP_NOT and OP_NOTI
4250      currently used only for single-byte chars. */      are currently used only for single-byte chars. */
4251    
4252      else if (*previous == OP_NOT)      else if (*previous == OP_NOT || *previous == OP_NOTI)
4253        {        {
4254        op_type = OP_NOTSTAR - OP_STAR;  /* Use "not" opcodes */        op_type = ((*previous == OP_NOT)? OP_NOTSTAR : OP_NOTSTARI) - OP_STAR;
4255        c = previous[1];        c = previous[1];
4256        if (!possessive_quantifier &&        if (!possessive_quantifier &&
4257            repeat_max < 0 &&            repeat_max < 0 &&
# Line 4409  for (;; ptr++) Line 4448  for (;; ptr++)
4448  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
4449               *previous == OP_XCLASS ||               *previous == OP_XCLASS ||
4450  #endif  #endif
4451               *previous == OP_REF)               *previous == OP_REF ||
4452                 *previous == OP_REFI)
4453        {        {
4454        if (repeat_max == 0)        if (repeat_max == 0)
4455          {          {
# Line 4463  for (;; ptr++) Line 4503  for (;; ptr++)
4503    
4504        /* If the maximum repeat count is unlimited, find the end of the bracket        /* If the maximum repeat count is unlimited, find the end of the bracket
4505        by scanning through from the start, and compute the offset back to it        by scanning through from the start, and compute the offset back to it
4506        from the current code pointer. There may be an OP_OPT setting following        from the current code pointer. */
       the final KET, so we can't find the end just by going back from the code  
       pointer. */  
4507    
4508        if (repeat_max == -1)        if (repeat_max == -1)
4509          {          {
# Line 4765  for (;; ptr++) Line 4803  for (;; ptr++)
4803          case OP_QUERY: *tempcode = OP_POSQUERY; break;          case OP_QUERY: *tempcode = OP_POSQUERY; break;
4804          case OP_UPTO:  *tempcode = OP_POSUPTO; break;          case OP_UPTO:  *tempcode = OP_POSUPTO; break;
4805    
4806          case OP_TYPESTAR:  *tempcode = OP_TYPEPOSSTAR; break;          case OP_STARI:  *tempcode = OP_POSSTARI; break;
4807          case OP_TYPEPLUS:  *tempcode = OP_TYPEPOSPLUS; break;          case OP_PLUSI:  *tempcode = OP_POSPLUSI; break;
4808          case OP_TYPEQUERY: *tempcode = OP_TYPEPOSQUERY; break;          case OP_QUERYI: *tempcode = OP_POSQUERYI; break;
4809          case OP_TYPEUPTO:  *tempcode = OP_TYPEPOSUPTO; break;          case OP_UPTOI:  *tempcode = OP_POSUPTOI; break;
4810    
4811          case OP_NOTSTAR:  *tempcode = OP_NOTPOSSTAR; break;          case OP_NOTSTAR:  *tempcode = OP_NOTPOSSTAR; break;
4812          case OP_NOTPLUS:  *tempcode = OP_NOTPOSPLUS; break;          case OP_NOTPLUS:  *tempcode = OP_NOTPOSPLUS; break;
4813          case OP_NOTQUERY: *tempcode = OP_NOTPOSQUERY; break;          case OP_NOTQUERY: *tempcode = OP_NOTPOSQUERY; break;
4814          case OP_NOTUPTO:  *tempcode = OP_NOTPOSUPTO; break;          case OP_NOTUPTO:  *tempcode = OP_NOTPOSUPTO; break;
4815    
4816            case OP_NOTSTARI:  *tempcode = OP_NOTPOSSTARI; break;
4817            case OP_NOTPLUSI:  *tempcode = OP_NOTPOSPLUSI; break;
4818            case OP_NOTQUERYI: *tempcode = OP_NOTPOSQUERYI; break;
4819            case OP_NOTUPTOI:  *tempcode = OP_NOTPOSUPTOI; break;
4820    
4821            case OP_TYPESTAR:  *tempcode = OP_TYPEPOSSTAR; break;
4822            case OP_TYPEPLUS:  *tempcode = OP_TYPEPOSPLUS; break;
4823            case OP_TYPEQUERY: *tempcode = OP_TYPEPOSQUERY; break;
4824            case OP_TYPEUPTO:  *tempcode = OP_TYPEPOSUPTO; break;
4825    
4826          /* Because we are moving code along, we must ensure that any          /* Because we are moving code along, we must ensure that any
4827          pending recursive references are updated. */          pending recursive references are updated. */
4828    
# Line 5679  for (;; ptr++) Line 5727  for (;; ptr++)
5727              }              }
5728            else            else
5729              {              {
             if ((options & PCRE_IMS) != (newoptions & PCRE_IMS))  
               {  
               *code++ = OP_OPT;  
               *code++ = newoptions & PCRE_IMS;  
               }  
5730              greedy_default = ((newoptions & PCRE_UNGREEDY) != 0);              greedy_default = ((newoptions & PCRE_UNGREEDY) != 0);
5731              greedy_non_default = greedy_default ^ 1;              greedy_non_default = greedy_default ^ 1;
5732              req_caseopt = ((newoptions & PCRE_CASELESS) != 0)? REQ_CASELESS : 0;              req_caseopt = ((newoptions & PCRE_CASELESS) != 0)? REQ_CASELESS : 0;
# Line 6021  for (;; ptr++) Line 6064  for (;; ptr++)
6064          HANDLE_REFERENCE:    /* Come here from named backref handling */          HANDLE_REFERENCE:    /* Come here from named backref handling */
6065          if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;          if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;
6066          previous = code;          previous = code;
6067          *code++ = OP_REF;          *code++ = ((options & PCRE_CASELESS) != 0)? OP_REFI : OP_REF;
6068          PUT2INC(code, 0, recno);          PUT2INC(code, 0, recno);
6069          cd->backref_map |= (recno < 32)? (1 << recno) : 1;          cd->backref_map |= (recno < 32)? (1 << recno) : 1;
6070          if (recno > cd->top_backref) cd->top_backref = recno;          if (recno > cd->top_backref) cd->top_backref = recno;
# Line 6129  for (;; ptr++) Line 6172  for (;; ptr++)
6172    
6173      ONE_CHAR:      ONE_CHAR:
6174      previous = code;      previous = code;
6175      *code++ = ((options & PCRE_CASELESS) != 0)? OP_CHARNC : OP_CHAR;      *code++ = ((options & PCRE_CASELESS) != 0)? OP_CHARI : OP_CHAR;
6176      for (c = 0; c < mclength; c++) *code++ = mcbuffer[c];      for (c = 0; c < mclength; c++) *code++ = mcbuffer[c];
6177    
6178      /* Remember if \r or \n were seen */      /* Remember if \r or \n were seen */
# Line 6193  return FALSE; Line 6236  return FALSE;
6236  /* On entry, ptr is pointing past the bracket character, but on return it  /* On entry, ptr is pointing past the bracket character, but on return it
6237  points to the closing bracket, or vertical bar, or end of string. The code  points to the closing bracket, or vertical bar, or end of string. The code
6238  variable is pointing at the byte into which the BRA operator has been stored.  variable is pointing at the byte into which the BRA operator has been stored.
 If the ims options are changed at the start (for a (?ims: group) or during any  
 branch, we need to insert an OP_OPT item at the start of every following branch  
 to ensure they get set correctly at run time, and also pass the new options  
 into every subsequent branch compile.  
   
6239  This function is used during the pre-compile phase when we are trying to find  This function is used during the pre-compile phase when we are trying to find
6240  out the amount of memory needed, as well as during the real compile phase. The  out the amount of memory needed, as well as during the real compile phase. The
6241  value of lengthptr distinguishes the two phases.  value of lengthptr distinguishes the two phases.
# Line 6289  for (;;) Line 6327  for (;;)
6327    
6328    if (reset_bracount) cd->bracount = orig_bracount;    if (reset_bracount) cd->bracount = orig_bracount;
6329    
   /* Handle a change of ims options at the start of the branch */  
   
   if ((options & PCRE_IMS) != oldims)  
     {  
     *code++ = OP_OPT;  
     *code++ = options & PCRE_IMS;  
     length += 2;  
     }  
   
6330    /* Set up dummy OP_REVERSE if lookbehind assertion */    /* Set up dummy OP_REVERSE if lookbehind assertion */
6331    
6332    if (lookbehind)    if (lookbehind)
# Line 6454  for (;;) Line 6483  for (;;)
6483        cd->open_caps = cd->open_caps->next;        cd->open_caps = cd->open_caps->next;
6484        }        }
6485    
     /* Reset options if needed. */  
   
     if ((options & PCRE_IMS) != oldims && *ptr == CHAR_RIGHT_PARENTHESIS)  
       {  
       *code++ = OP_OPT;  
       *code++ = oldims;  
       length += 2;  
       }  
   
6486      /* Retain the highest bracket number, in case resetting was used. */      /* Retain the highest bracket number, in case resetting was used. */
6487    
6488      cd->bracount = max_bracount;      cd->bracount = max_bracount;
# Line 6522  for (;;) Line 6542  for (;;)
6542  /* Try to find out if this is an anchored regular expression. Consider each  /* Try to find out if this is an anchored regular expression. Consider each
6543  alternative branch. If they all start with OP_SOD or OP_CIRC, or with a bracket  alternative branch. If they all start with OP_SOD or OP_CIRC, or with a bracket
6544  all of whose alternatives start with OP_SOD or OP_CIRC (recurse ad lib), then  all of whose alternatives start with OP_SOD or OP_CIRC (recurse ad lib), then
6545  it's anchored. However, if this is a multiline pattern, then only OP_SOD  it's anchored. However, if this is a multiline pattern, then only OP_SOD will
6546  counts, since OP_CIRC can match in the middle.  be found, because ^ generates OP_CIRCM in that mode.
6547    
6548  We can also consider a regex to be anchored if OP_SOM starts all its branches.  We can also consider a regex to be anchored if OP_SOM starts all its branches.
6549  This is the code for \G, which means "match at start of match position, taking  This is the code for \G, which means "match at start of match position, taking
# Line 6597  do { Line 6617  do {
6617    
6618     /* Check for explicit anchoring */     /* Check for explicit anchoring */
6619    
6620     else if (op != OP_SOD && op != OP_SOM &&     else if (op != OP_SOD && op != OP_SOM && op != OP_CIRC) return FALSE;
            ((*options & PCRE_MULTILINE) != 0 || op != OP_CIRC))  
      return FALSE;  
6621     code += GET(code, 1);     code += GET(code, 1);
6622     }     }
6623  while (*code == OP_ALT);   /* Loop for each alternative */  while (*code == OP_ALT);   /* Loop for each alternative */
# Line 6699  do { Line 6717  do {
6717    
6718     /* Check for explicit circumflex */     /* Check for explicit circumflex */
6719    
6720     else if (op != OP_CIRC) return FALSE;     else if (op != OP_CIRC && op != OP_CIRCM) return FALSE;
6721    
6722     /* Move on to the next alternative */     /* Move on to the next alternative */
6723    
# Line 6760  do { Line 6778  do {
6778       scode += 2;       scode += 2;
6779    
6780       case OP_CHAR:       case OP_CHAR:
6781       case OP_CHARNC:       case OP_CHARI:
6782       case OP_PLUS:       case OP_PLUS:
6783       case OP_MINPLUS:       case OP_MINPLUS:
6784       case OP_POSPLUS:       case OP_POSPLUS:
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