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regcomp.sym
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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 [num-args] [flags] [longjump-len] ; DESCRIPTION
# flag <S> means is REGNODE_SIMPLE; flag <V> means is REGNODE_VARIES
#
#
# run perl regen.pl after editing this file
#* Exit points
END END, no ; End of program.
SUCCEED END, no ; Return from a subroutine, basically.
#* Anchors:
BOL BOL, no ; Match "" at beginning of line.
MBOL BOL, no ; Same, assuming multiline.
SBOL BOL, no ; Same, assuming singleline.
EOS EOL, no ; Match "" at end of string.
EOL EOL, no ; Match "" at end of line.
MEOL EOL, no ; Same, assuming multiline.
SEOL EOL, no ; Same, assuming singleline.
# 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 ; Match "" at any word boundary using native charset semantics for non-utf8
BOUNDL BOUND, no ; Match "" at any locale word boundary
BOUNDU BOUND, no ; Match "" at any word boundary using Unicode semantics
BOUNDA BOUND, no ; Match "" at any word boundary using ASCII semantics
# All NBOUND nodes are required by code in regexec.c to be greater than all BOUND ones
NBOUND NBOUND, no ; Match "" at any word non-boundary using native charset semantics for non-utf8
NBOUNDL NBOUND, no ; Match "" at any locale word non-boundary
NBOUNDU NBOUND, no ; Match "" at any word non-boundary using Unicode semantics
NBOUNDA NBOUND, no ; Match "" at any word non-boundary using ASCII semantics
GPOS GPOS, no ; Matches where last m//g left off.
#* [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.
CANY REG_ANY, no 0 S ; Match any one byte.
ANYOF ANYOF, sv 0 S ; Match character in (or not in) this class, single char match only
ANYOF_WARN_SUPER ANYOF, sv 0 S ; Match character in (or not in) this class, warn (if enabled) upon matching a char above Unicode max;
ANYOF_SYNTHETIC ANYOF, sv 0 S ; Synthetic start class
# 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 is 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 0 V ; Match this alternative, or the next...
#*Back pointer
#* BACK Normal "next" pointers all implicitly point forward;
#* BACK exists to make loop structures possible.
#* not used
BACK BACK, no 0 V ; Match "", "next" ptr points backward.
#*Literals
# NOTE: the relative ordering of these types is important do not change it
EXACT EXACT, str ; Match this string (preceded by length).
EXACTF EXACT, str ; Match this non-UTF-8 string (not guaranteed to be folded) using /id rules (w/len).
EXACTFL EXACT, str ; Match this string (not guaranteed to be folded) using /il rules (w/len).
EXACTFU EXACT, str ; Match this string (folded iff in UTF-8, length in folding doesn't change if not in UTF-8) using /iu rules (w/len).
EXACTFA EXACT, str ; Match this string (not guaranteed to be folded) using /iaa rules (w/len).
EXACTFU_SS EXACT, str ; Match this string (folded iff in UTF-8, length in folding may change even if not in UTF-8) using /iu rules (w/len).
EXACTFU_TRICKYFOLD EXACT, str ; Match this folded UTF-8 string using /iu rules
#*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 using BACK. 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.
PLUS PLUS, node 0 V ; Match this (simple) thing 1 or more times.
CURLY CURLY, sv 2 V ; Match this simple thing {n,m} times.
CURLYN CURLY, no 2 V ; Capture next-after-this simple thing
CURLYM CURLY, no 2 V ; Capture this medium-complex thing {n,m} times.
CURLYX CURLY, sv 2 V ; Match 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 ; Analogous to OPEN.
REF REF, num 1 V ; Match some already matched string
REFF REF, num 1 V ; Match already matched string, folded using native charset semantics for non-utf8
REFFL REF, num 1 V ; Match already matched string, folded in loc.
# 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 1 V ; Match already matched string, folded using unicode semantics for non-utf8
REFFA REF, num 1 V ; Match already matched string, folded using unicode semantics for non-utf8, no mixing ASCII, non-ASCII
#*Named references. Code in regcomp.c assumes that these all are after
#*the numbered references
NREF REF, no-sv 1 V ; Match some already matched string
NREFF REF, no-sv 1 V ; Match already matched string, folded using native charset semantics for non-utf8
NREFFL REF, no-sv 1 V ; Match already matched string, folded in loc.
NREFFU REF, num 1 V ; Match already matched string, folded using unicode semantics for non-utf8
NREFFA REF, num 1 V ; Match already matched string, folded using unicode semantics for non-utf8, no mixing ASCII, non-ASCII
IFMATCH BRANCHJ, off 1 . 2 ; Succeeds if the following matches.
UNLESSM BRANCHJ, off 1 . 2 ; 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.
#*Support for long RE
LONGJMP LONGJMP, off 1 . 1 ; Jump far away.
BRANCHJ BRANCHJ, off 1 V 1 ; BRANCH with long offset.
#*The heavy worker
EVAL EVAL, evl 1 ; 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.
#*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
#*Regex Subroutines
GOSUB GOSUB, num/ofs 2L ; recurse to paren arg1 at (signed) ofs arg2
GOSTART GOSTART, no ; recurse to start of pattern
#*Special conditionals
NGROUPP NGROUPP, 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, none ; Same as (?!)
ACCEPT ENDLIKE, parno 1 ; Accepts the current matched string.
#*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.
#*New charclass like patterns
LNBREAK LNBREAK, none ; generic newline pattern
# NEW STUFF SOMEWHERE ABOVE THIS LINE
################################################################################
#*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 cant be optimized. So END implies "unoptimizable" and PSEUDO
#* mean "not seen anything to optimize yet".
PSEUDO PSEUDO, off ; Pseudo opcode for internal use.
-------------------------------------------------------------------------------
# Format for second section:
# REGOP \t typelist [ \t typelist]
# typelist= namelist
# = namelist:FAIL
# = name:count
# Anything below is a state
#
#
TRIE next:FAIL
EVAL 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_known,B_min,B_max:FAIL
COMMIT next:FAIL
MARKPOINT next:FAIL
SKIP next:FAIL
CUTGROUP next:FAIL
KEEPS next:FAIL