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regcomp.sym
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# regcomp.sym
#
# File has two sections, divided by a line of dashes '-'.
#
# Lines beginning with # are ignored, except for those that start with #*
# which are included in pod/perldebguts.pod. # within a line may be part
# of a description.
#
# First section is for regops, second section is for regmatch-states
#
# Note that the order in this file is important.
#
# Format for first section:
# NAME \s+ TYPE, arg-description [struct regnode suffix] [flags] [longjump] ; DESCRIPTION
# arg-description is currently unused
# suffix is appended to 'struct_regnode_' giving which one to use. If empty,
# it means plain 'struct regnode'. If the regnode is a string one, this
# should instead refer to the base regnode, without the char[1] element
# of the structure
# flag <S> means is REGNODE_SIMPLE; flag <V> means is REGNODE_VARIES; <.> is
# a placeholder
# longjump is 1 if the (first) argument holds the next offset (instead of the
# usual 'next_offset' field
#
# run perl regen.pl after editing this file
# +- suffix of which struct regnode to use e.g.,
# | +- flags (S or V) struct regnode_1
# un- | | +- longjmp (0, blank, or 1) blank means 0
# Name Type used | | | ; comment
# --------------------------------------------------------------------------
# IFMATCH BRANCHJ, off 1 . 1 ; Succeeds if the following matches.
# UNLESSM BRANCHJ, off 1 . 1 ; Fails if the following matches.
# SUSPEND BRANCHJ, off 1 V 1 ; "Independent" sub-RE.
# IFTHEN BRANCHJ, off 1 V 1 ; Switch, should be preceded by switcher.
# GROUPP GROUPP, num 1 ; Whether the group matched.
#
# If we were to start running out of regnodes, many of the ones that are
# complements could be combined with their non-complement mates. For example,
# POSIXU could have the flags field have the bottom bit mean do we complement
# or not, and the type be shifted left 1 bit. Then all that would be needed to
# extract which to do is a mask for the complement bit, and a right shift for
# the other, an inconsequential increase in instructions. It might actually be
# clearer and slightly faster given the case statement and assignment are
# removed. Note that not everything could be collapsed: NPOSIXA, for example,
# would require special handling for performance.
#* Exit points
END END, no ; End of program.
SUCCEED END, no ; Return from a subroutine, basically.
#* Line Start Anchors:
#Note flags field for SBOL indicates if it is a /^/ or a /\A/
SBOL BOL, no ; Match "" at beginning of line: /^/, /\A/
MBOL BOL, no ; Same, assuming multiline: /^/m
#* Line End Anchors:
SEOL EOL, no ; Match "" at end of line: /$/
MEOL EOL, no ; Same, assuming multiline: /$/m
EOS EOL, no ; Match "" at end of string: /\z/
#* Match Start Anchors:
GPOS GPOS, no ; Matches where last m//g left off.
#* Word Boundary Opcodes:
# The regops that have varieties that vary depending on the character set regex
# modifiers have to ordered thusly: /d, /l, /u, /a, /aa. This is because code
# in regcomp.c uses the enum value of the modifier as an offset from the /d
# version. The complements must come after the non-complements.
# BOUND, POSIX and their complements are affected, as well as EXACTF.
BOUND BOUND, no ; Like BOUNDA for non-utf8, otherwise like BOUNDU
BOUNDL BOUND, no ; Like BOUND/BOUNDU, but \w and \W are defined by current locale
BOUNDU BOUND, no ; Match "" at any boundary of a given type using /u rules.
BOUNDA BOUND, no ; Match "" at any boundary between \w\W or \W\w, where \w is [_a-zA-Z0-9]
# All NBOUND nodes are required by code in regexec.c to be greater than all BOUND ones
NBOUND NBOUND, no ; Like NBOUNDA for non-utf8, otherwise like BOUNDU
NBOUNDL NBOUND, no ; Like NBOUND/NBOUNDU, but \w and \W are defined by current locale
NBOUNDU NBOUND, no ; Match "" at any non-boundary of a given type using /u rules.
NBOUNDA NBOUND, no ; Match "" between any \w\w or \W\W, where \w is [_a-zA-Z0-9]
#* [Special] alternatives:
REG_ANY REG_ANY, no 0 S ; Match any one character (except newline).
SANY REG_ANY, no 0 S ; Match any one character.
ANYOF ANYOF, sv charclass S ; Match character in (or not in) this class, single char match only
ANYOFD ANYOF, sv charclass S ; Like ANYOF, but /d is in effect
ANYOFL ANYOF, sv charclass S ; Like ANYOF, but /l is in effect
ANYOFPOSIXL ANYOF, sv charclass_posixl S ; Like ANYOFL, but matches [[:posix:]] classes
# Must be sequential
ANYOFH ANYOFH, sv 1 S ; Like ANYOF, but only has "High" matches, none in the bitmap; the flags field contains the lowest matchable UTF-8 start byte
ANYOFHb ANYOFH, sv 1 S ; Like ANYOFH, but all matches share the same UTF-8 start byte, given in the flags field
ANYOFHr ANYOFH, sv 1 S ; Like ANYOFH, but the flags field contains packed bounds for all matchable UTF-8 start bytes.
ANYOFHs ANYOFH, sv:str 1 S ; Like ANYOFHb, but has a string field that gives the leading matchable UTF-8 bytes; flags field is len
ANYOFR ANYOFR, packed 1 S ; Matches any character in the range given by its packed args: upper 12 bits is the max delta from the base lower 20; the flags field contains the lowest matchable UTF-8 start byte
ANYOFRb ANYOFR, packed 1 S ; Like ANYOFR, but all matches share the same UTF-8 start byte, given in the flags field
# There is no ANYOFRr because khw doesn't think there are likely to be
# real-world cases where such a large range is used.
#
# And khw doesn't believe an ANYOFRs (which would behave like ANYOFHs) is
# actually worth it. On two-byte UTF-8, the first byte alone is all we need,
# and ANYOFR already does that. And we don't consider non-Unicode code points
# or EBCDIC for performance decisions. If we had it, we would be comparing the
# strings, and if they are equal convert to UV and then test to see if it is in
# the range. The fast DFA we now use to do the conversion is slower than
# comparing the strings, but not by much, and negligible in 2 or 3 byte
# operations. (We don't have to compare the final byte as it has to be
# different or else this wouldn't be a range.) So we might as well dispense
# with the comparisons that ANYOFRs would do, and go directly to do the
# conversion.
ANYOFHbbm ANYOFHbbm none bbm S ; Like ANYOFHb, but only for 2-byte UTF-8 characters; uses a bitmap to match the continuation byte
ANYOFM ANYOFM, byte 1 S ; Like ANYOF, but matches an invariant byte as determined by the mask and arg
NANYOFM ANYOFM, byte 1 S ; complement of ANYOFM
#* POSIX Character Classes:
# Order of the below is important. See ordering comment above.
POSIXD POSIXD, none 0 S ; Some [[:class:]] under /d; the FLAGS field gives which one
POSIXL POSIXD, none 0 S ; Some [[:class:]] under /l; the FLAGS field gives which one
POSIXU POSIXD, none 0 S ; Some [[:class:]] under /u; the FLAGS field gives which one
POSIXA POSIXD, none 0 S ; Some [[:class:]] under /a; the FLAGS field gives which one
NPOSIXD NPOSIXD, none 0 S ; complement of POSIXD, [[:^class:]]
NPOSIXL NPOSIXD, none 0 S ; complement of POSIXL, [[:^class:]]
NPOSIXU NPOSIXD, none 0 S ; complement of POSIXU, [[:^class:]]
NPOSIXA NPOSIXD, none 0 S ; complement of POSIXA, [[:^class:]]
# End of order being important
CLUMP CLUMP, no 0 V ; Match any extended grapheme cluster sequence
#* Alternation
#* BRANCH The set of branches constituting a single choice are
#* hooked together with their "next" pointers, since
#* precedence prevents anything being concatenated to
#* any individual branch. The "next" pointer of the last
#* BRANCH in a choice points to the thing following the
#* whole choice. This is also where the final "next"
#* pointer of each individual branch points; each branch
#* starts with the operand node of a BRANCH node.
#*
BRANCH BRANCH, node 1 V ; Match this alternative, or the next...
#*Literals
# NOTE: the relative ordering of these types is important do not change it
# By convention, folding nodes begin with EXACTF; A digit 8 is in the name if
# and only if it it requires a UTF-8 target string in order to successfully
# match.
EXACT EXACT, str ; Match this string (flags field is the length).
#* In a long string node, the U32 argument is the length, and is
#* immediately followed by the string.
LEXACT EXACT, len:str 1; Match this long string (preceded by length; flags unused).
EXACTL EXACT, str ; Like EXACT, but /l is in effect (used so locale-related warnings can be checked for)
EXACTF EXACT, str ; Like EXACT, but match using /id rules; (string not UTF-8, ASCII folded; non-ASCII not)
EXACTFL EXACT, str ; Like EXACT, but match using /il rules; (string not likely to be folded)
EXACTFU EXACT, str ; Like EXACT, but match using /iu rules; (string folded)
# The reason MICRO and SHARP S aren't folded in non-UTF8 patterns is because
# they would fold to something that requires UTF-8. SHARP S would normally
# fold to 'ss', but because of /aa, it instead folds to a pair of LATIN SMALL
# LETTER LONG S characters (U+017F)
EXACTFAA EXACT, str ; Like EXACT, but match using /iaa rules; (string folded except MICRO in non-UTF8 patterns; doesn't contain SHARP S unless UTF-8; folded length <= unfolded)
# must immediately follow EXACTFAA
EXACTFAA_NO_TRIE EXACT, str ; Like EXACTFAA, (string not UTF-8, folded except: MICRO, SHARP S; folded length <= unfolded, not currently trie-able)
# End of important relative ordering.
EXACTFUP EXACT, str ; Like EXACT, but match using /iu rules; (string not UTF-8, folded except MICRO: hence Problematic)
# In order for a non-UTF-8 EXACTFAA to think the pattern is pre-folded when
# matching a UTF-8 target string, there would have to be something like an
# EXACTFAA_MICRO which would not be considered pre-folded for UTF-8 targets,
# since the fold of the MICRO SIGN would not be done, and would be
# representable in the UTF-8 target string.
EXACTFLU8 EXACT, str ; Like EXACTFU, but use /il, UTF-8, (string is folded, and everything in it is above 255
EXACT_REQ8 EXACT, str ; Like EXACT, but only UTF-8 encoded targets can match
LEXACT_REQ8 EXACT, len:str 1 ; Like LEXACT, but only UTF-8 encoded targets can match
EXACTFU_REQ8 EXACT, str ; Like EXACTFU, but only UTF-8 encoded targets can match
# One could add EXACTFAA8 and something that has the same effect for /l,
# but these would be extremely uncommon
EXACTFU_S_EDGE EXACT, str ; /di rules, but nothing in it precludes /ui, except begins and/or ends with [Ss]; (string not UTF-8; compile-time only)
#*New charclass like patterns
LNBREAK LNBREAK, none ; generic newline pattern
#*Trie Related
#* Behave the same as A|LIST|OF|WORDS would. The '..C' variants
#* have inline charclass data (ascii only), the 'C' store it in the
#* structure.
# NOTE: the relative order of the TRIE-like regops is significant
TRIE TRIE, trie 1 ; Match many EXACT(F[ALU]?)? at once. flags==type
TRIEC TRIE,trie charclass ; Same as TRIE, but with embedded charclass data
# For start classes, contains an added fail table.
AHOCORASICK TRIE, trie 1 ; Aho Corasick stclass. flags==type
AHOCORASICKC TRIE,trie charclass ; Same as AHOCORASICK, but with embedded charclass data
#*Do nothing types
NOTHING NOTHING, no ; Match empty string.
#*A variant of above which delimits a group, thus stops optimizations
TAIL NOTHING, no ; Match empty string. Can jump here from outside.
#*Loops
#* STAR,PLUS '?', and complex '*' and '+', are implemented as
#* circular BRANCH structures. Simple cases
#* (one character per match) are implemented with STAR
#* and PLUS for speed and to minimize recursive plunges.
#*
STAR STAR, node 0 V ; Match this (simple) thing 0 or more times: /A{0,}B/ where A is width 1 char
PLUS PLUS, node 0 V ; Match this (simple) thing 1 or more times: /A{1,}B/ where A is width 1 char
CURLY CURLY, sv 3 V ; Match this (simple) thing {n,m} times: /A{m,n}B/ where A is width 1 char
CURLYN CURLY, no 3 V ; Capture next-after-this simple thing: /(A){m,n}B/ where A is width 1 char
CURLYM CURLY, no 3 V ; Capture this medium-complex thing {n,m} times: /(A){m,n}B/ where A is fixed-length
CURLYX CURLY, sv 3 V ; Match/Capture this complex thing {n,m} times.
#*This terminator creates a loop structure for CURLYX
WHILEM WHILEM, no 0 V ; Do curly processing and see if rest matches.
#*Buffer related
#*OPEN,CLOSE,GROUPP ...are numbered at compile time.
OPEN OPEN, num 1 ; Mark this point in input as start of #n.
CLOSE CLOSE, num 1 ; Close corresponding OPEN of #n.
SROPEN SROPEN, none ; Same as OPEN, but for script run
SRCLOSE SRCLOSE, none ; Close preceding SROPEN
REF REF, num 2 V ; Match some already matched string
REFF REF, num 2 V ; Match already matched string, using /di rules.
REFFL REF, num 2 V ; Match already matched string, using /li rules.
# N?REFF[AU] could have been implemented using the FLAGS field of the
# regnode, but by having a separate node type, we can use the existing switch
# statement to avoid some tests
REFFU REF, num 2 V ; Match already matched string, usng /ui.
REFFA REF, num 2 V ; Match already matched string, using /aai rules.
#*Named references. Code in regcomp.c assumes that these all are after
#*the numbered references
REFN REF, no-sv 2 V ; Match some already matched string
REFFN REF, no-sv 2 V ; Match already matched string, using /di rules.
REFFLN REF, no-sv 2 V ; Match already matched string, using /li rules.
REFFUN REF, num 2 V ; Match already matched string, using /ui rules.
REFFAN REF, num 2 V ; Match already matched string, using /aai rules.
#*Support for long RE
LONGJMP LONGJMP, off 1 . 1 ; Jump far away.
BRANCHJ BRANCHJ, off 2 V 1 ; BRANCH with long offset.
#*Special Case Regops
IFMATCH BRANCHJ, off 1 . 1 ; Succeeds if the following matches; non-zero flags "f", next_off "o" means lookbehind assertion starting "f..(f-o)" characters before current
UNLESSM BRANCHJ, off 1 . 1 ; Fails if the following matches; non-zero flags "f", next_off "o" means lookbehind assertion starting "f..(f-o)" characters before current
SUSPEND BRANCHJ, off 1 V 1 ; "Independent" sub-RE.
IFTHEN BRANCHJ, off 1 V 1 ; Switch, should be preceded by switcher.
GROUPP GROUPP, num 1 ; Whether the group matched.
#*The heavy worker
EVAL EVAL, evl/flags 2 ; Execute some Perl code.
#*Modifiers
MINMOD MINMOD, no ; Next operator is not greedy.
LOGICAL LOGICAL, no ; Next opcode should set the flag only.
#*This is not used yet
RENUM BRANCHJ, off 1 . 1 ; Group with independently numbered parens.
#*Regex Subroutines
GOSUB GOSUB, num/ofs 2 ; recurse to paren arg1 at (signed) ofs arg2
#*Special conditionals
GROUPPN GROUPPN, no-sv 1 ; Whether the group matched.
INSUBP INSUBP, num 1 ; Whether we are in a specific recurse.
DEFINEP DEFINEP, none 1 ; Never execute directly.
#*Backtracking Verbs
ENDLIKE ENDLIKE, none ; Used only for the type field of verbs
OPFAIL ENDLIKE, no-sv 1 ; Same as (?!), but with verb arg
ACCEPT ENDLIKE, no-sv/num 2 ; Accepts the current matched string, with verbar
#*Verbs With Arguments
VERB VERB, no-sv 1 ; Used only for the type field of verbs
PRUNE VERB, no-sv 1 ; Pattern fails at this startpoint if no-backtracking through this
MARKPOINT VERB, no-sv 1 ; Push the current location for rollback by cut.
SKIP VERB, no-sv 1 ; On failure skip forward (to the mark) before retrying
COMMIT VERB, no-sv 1 ; Pattern fails outright if backtracking through this
CUTGROUP VERB, no-sv 1 ; On failure go to the next alternation in the group
#*Control what to keep in $&.
KEEPS KEEPS, no ; $& begins here.
#*Validate that lookbehind IFMATCH and UNLESSM end at the right place
LOOKBEHIND_END END, no ; Return from lookbehind (IFMATCH/UNLESSM) and validate position
# NEW STUFF SOMEWHERE ABOVE THIS LINE. Stuff that regexec.c: find_byclass()
# and regrepeat() use should go way above, near LNBREAK to allow a more compact
# jump table to be generated for their switch() statements
################################################################################
#*SPECIAL REGOPS
#* This is not really a node, but an optimized away piece of a "long"
#* node. To simplify debugging output, we mark it as if it were a node
OPTIMIZED NOTHING, off ; Placeholder for dump.
#* Special opcode with the property that no opcode in a compiled program
#* will ever be of this type. Thus it can be used as a flag value that
#* no other opcode has been seen. END is used similarly, in that an END
#* node can't be optimized. So END implies "unoptimizable" and PSEUDO
#* mean "not seen anything to optimize yet".
PSEUDO PSEUDO, off ; Pseudo opcode for internal use.
REGEX_SET REGEX_SET, depth p S ; Regex set, temporary node used in pre-optimization compilation
-------------------------------------------------------------------------------
# Format for second section:
# REGOP \t typelist [ \t typelist]
# typelist= namelist
# = namelist:FAIL
# = name:count
# Anything below is a state
#
#
TRIE next:FAIL
EVAL B,postponed_AB:FAIL
CURLYX end:FAIL
WHILEM A_pre,A_min,A_max,B_min,B_max:FAIL
BRANCH next:FAIL
CURLYM A,B:FAIL
IFMATCH A:FAIL
CURLY B_min,B_max:FAIL
COMMIT next:FAIL
MARKPOINT next:FAIL
SKIP next:FAIL
CUTGROUP next:FAIL
KEEPS next:FAIL
REF next:FAIL