/* op.h
*
- * Copyright (c) 1991-2001, Larry Wall
+ * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+ * 2000, 2001, 2002, 2003, 2004, 2005, 2006 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
* parent takes over role of remembering starting op.)
* op_ppaddr Pointer to current ppcode's function.
* op_type The type of the operation.
+ * op_opt Whether or not the op has been optimised by the
+ * peephole optimiser.
+ * op_static Whether or not the op is statically defined.
+ * This flag is used by the B::C compiler backend
+ * and indicates that the op should not be freed.
+ *
+ * See the comments in S_clear_yystack() for more
+ * details on the following three flags:
+
+ * op_latefree tell op_free() to clear this op (and free any kids)
+ * but not yet deallocate the struct. This means that
+ * the op may be safely op_free()d multiple times
+ * op_latefreed an op_latefree op has been op_free()d
+ * op_attached this op (sub)tree has been attached to a CV
+ *
+ * op_spare two spare bits!
* op_flags Flags common to all operations. See OPf_* below.
* op_private Flags peculiar to a particular operation (BUT,
* by default, set to the number of children until
* which may or may not check number of children).
*/
-typedef U32 PADOFFSET;
-#define NOT_IN_PAD ((PADOFFSET) -1)
-
#ifdef DEBUGGING_OPS
#define OPCODE opcode
#else
#define OPCODE U16
#endif
+#ifdef PERL_MAD
+# define MADPROP_IN_BASEOP MADPROP* op_madprop;
+#else
+# define MADPROP_IN_BASEOP
+#endif
+
#ifdef BASEOP_DEFINITION
#define BASEOP BASEOP_DEFINITION
#else
OP* op_next; \
OP* op_sibling; \
OP* (CPERLscope(*op_ppaddr))(pTHX); \
+ MADPROP_IN_BASEOP \
PADOFFSET op_targ; \
- OPCODE op_type; \
- U16 op_seq; \
+ unsigned op_type:9; \
+ unsigned op_opt:1; \
+ unsigned op_static:1; \
+ unsigned op_latefree:1; \
+ unsigned op_latefreed:1; \
+ unsigned op_attached:1; \
+ unsigned op_spare:2; \
U8 op_flags; \
U8 op_private;
#endif
dfl)
/*
+=head1 "Gimme" Values
+
=for apidoc Amn|U32|GIMME_V
The XSUB-writer's equivalent to Perl's C<wantarray>. Returns C<G_VOID>,
C<G_SCALAR> or C<G_ARRAY> for void, scalar or list context,
#define OPf_STACKED 64 /* Some arg is arriving on the stack. */
#define OPf_SPECIAL 128 /* Do something weird for this op: */
/* On local LVAL, don't init local value. */
+ /* On OP_CONST, value is the hints hash for
+ eval, so return a copy from pp_const() */
/* On OP_SORT, subroutine is inlined. */
/* On OP_NOT, inversion was implicit. */
/* On OP_LEAVE, don't restore curpm. */
/* On OP_ENTERITER, loop var is per-thread */
/* On pushre, re is /\s+/ imp. by split " " */
/* On regcomp, "use re 'eval'" was in scope */
+ /* On OP_READLINE, was <$filehandle> */
+ /* On RV2[ACGHS]V, don't create GV--in
+ defined()*/
+ /* On OP_DBSTATE, indicates breakpoint
+ * (runtime property) */
+ /* On OP_AELEMFAST, indiciates pad var */
+ /* On OP_REQUIRE, was seen as CORE::require */
+ /* On OP_ENTERWHEN, there's no condition */
+ /* On OP_BREAK, an implicit break */
+ /* On OP_SMARTMATCH, an implicit smartmatch */
+ /* On OP_ANONHASH and OP_ANONLIST, create a
+ reference to the new anon hash or array */
/* old names; don't use in new code, but don't break them, either */
#define OPf_LIST OPf_WANT_LIST
/* Private for OP_AASSIGN */
#define OPpASSIGN_COMMON 64 /* Left & right have syms in common. */
-#define OPpASSIGN_HASH 32 /* Assigning to possible pseudohash. */
/* Private for OP_SASSIGN */
#define OPpASSIGN_BACKWARDS 64 /* Left & right switched. */
+#define OPpASSIGN_CV_TO_GV 128 /* Possible optimisation for constants. */
+
+/* Private for OP_[AS]ASSIGN */
+#define OPpASSIGN_STATE 32 /* Assign to a "state" variable */
/* Private for OP_MATCH and OP_SUBST{,CONST} */
#define OPpRUNTIME 64 /* Pattern coming in on the stack */
#define OPpTRANS_TO_UTF 2
#define OPpTRANS_IDENTICAL 4 /* right side is same as left */
#define OPpTRANS_SQUASH 8
-#define OPpTRANS_DELETE 16
+ /* 16 is used for OPpTARGET_MY */
#define OPpTRANS_COMPLEMENT 32
#define OPpTRANS_GROWS 64
+#define OPpTRANS_DELETE 128
+#define OPpTRANS_ALL (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF|OPpTRANS_IDENTICAL|OPpTRANS_SQUASH|OPpTRANS_COMPLEMENT|OPpTRANS_GROWS|OPpTRANS_DELETE)
/* Private for OP_REPEAT */
#define OPpREPEAT_DOLIST 64 /* List replication. */
-/* Private for OP_RV2?V, OP_?ELEM */
-#define OPpDEREF (32|64) /* Want ref to something: */
+/* Private for OP_RV2GV, OP_RV2SV, OP_AELEM, OP_HELEM, OP_PADSV */
+#define OPpDEREF (32|64) /* autovivify: Want ref to something: */
#define OPpDEREF_AV 32 /* Want ref to AV. */
#define OPpDEREF_HV 64 /* Want ref to HV. */
#define OPpDEREF_SV (32|64) /* Want ref to SV. */
/* OP_ENTERSUB only */
#define OPpENTERSUB_DB 16 /* Debug subroutine. */
#define OPpENTERSUB_HASTARG 32 /* Called from OP tree. */
+#define OPpENTERSUB_NOMOD 64 /* Immune to mod() for :attrlist. */
/* OP_RV2CV only */
#define OPpENTERSUB_AMPER 8 /* Used & form to call. */
#define OPpENTERSUB_NOPAREN 128 /* bare sub call (without parens) */
#define OPpEARLY_CV 32 /* foo() called before sub foo was parsed */
/* OP_?ELEM only */
#define OPpLVAL_DEFER 16 /* Defer creation of array/hash elem */
- /* OP_RV2?V, OP_GVSV only */
+ /* OP_RV2?V, OP_GVSV, OP_ENTERITER only */
#define OPpOUR_INTRO 16 /* Variable was in an our() */
- /* OP_RV2[AH]V, OP_PAD[AH]V, OP_[AH]ELEM */
+ /* OP_RV2[AGH]V, OP_PAD[AH]V, OP_[AH]ELEM */
#define OPpMAYBE_LVSUB 8 /* We might be an lvalue to return */
+ /* OP_PADSV only */
+#define OPpPAD_STATE 16 /* is a "state" pad */
/* for OP_RV2?V, lower bits carry hints (currently only HINT_STRICT_REFS) */
+ /* OP_RV2GV only */
+#define OPpDONT_INIT_GV 4 /* Call gv_fetchpv with GV_NOINIT */
+/* (Therefore will return whatever is currently in the symbol table, not
+ guaranteed to be a PVGV) */
+
+ /* OP_RV2CV only */
+#define OPpMAY_RETURN_CONSTANT 1 /* If a constant sub, return the constant */
+
/* Private for OPs with TARGLEX */
/* (lower bits may carry MAXARG) */
#define OPpTARGET_MY 16 /* Target is PADMY. */
+/* Private for OP_ENTERITER and OP_ITER */
+#define OPpITER_REVERSED 4 /* for (reverse ...) */
+#define OPpITER_DEF 8 /* for $_ or for my $_ */
+
/* Private for OP_CONST */
+#define OPpCONST_NOVER 2 /* no 6; */
+#define OPpCONST_SHORTCIRCUIT 4 /* eg the constant 5 in (5 || foo) */
#define OPpCONST_STRICT 8 /* bearword subject to strict 'subs' */
#define OPpCONST_ENTERED 16 /* Has been entered as symbol. */
#define OPpCONST_ARYBASE 32 /* Was a $[ translated to constant. */
/* Private for OP_SORT */
#define OPpSORT_NUMERIC 1 /* Optimized away { $a <=> $b } */
#define OPpSORT_INTEGER 2 /* Ditto while under "use integer" */
-#define OPpSORT_REVERSE 4 /* Descending sort */
+#define OPpSORT_REVERSE 4 /* Reversed sort */
+#define OPpSORT_INPLACE 8 /* sort in-place; eg @a = sort @a */
+#define OPpSORT_DESCEND 16 /* Descending sort */
+#define OPpSORT_QSORT 32 /* Use quicksort (not mergesort) */
+#define OPpSORT_STABLE 64 /* Use a stable algorithm */
+
/* Private for OP_THREADSV */
#define OPpDONE_SVREF 64 /* Been through newSVREF once */
#define OPpOPEN_OUT_RAW 64 /* binmode(F,":raw") on output fh */
#define OPpOPEN_OUT_CRLF 128 /* binmode(F,":crlf") on output fh */
-/* Private for OP_EXIT */
+/* Private for OP_EXIT, HUSH also for OP_DIE */
+#define OPpHUSH_VMSISH 64 /* hush DCL exit msg vmsish mode*/
#define OPpEXIT_VMSISH 128 /* exit(0) vs. exit(1) vmsish mode*/
+/* Private for OP_FTXXX */
+#define OPpFT_ACCESS 2 /* use filetest 'access' */
+#define OPpFT_STACKED 4 /* stacked filetest, as in "-f -x $f" */
+#define OP_IS_FILETEST_ACCESS(op) \
+ (((op)->op_type) == OP_FTRREAD || \
+ ((op)->op_type) == OP_FTRWRITE || \
+ ((op)->op_type) == OP_FTREXEC || \
+ ((op)->op_type) == OP_FTEREAD || \
+ ((op)->op_type) == OP_FTEWRITE || \
+ ((op)->op_type) == OP_FTEEXEC)
+
+/* Private for OP_(MAP|GREP)(WHILE|START) */
+#define OPpGREP_LEX 2 /* iterate over lexical $_ */
+
+/* Private for OP_ENTEREVAL */
+#define OPpEVAL_HAS_HH 2 /* Does it have a copy of %^H */
+
struct op {
BASEOP
};
BASEOP
OP * op_first;
OP * op_last;
- OP * op_pmreplroot;
- OP * op_pmreplstart;
- PMOP * op_pmnext; /* list of all scanpats */
- REGEXP * op_pmregexp; /* compiled expression */
- U16 op_pmflags;
- U16 op_pmpermflags;
- U8 op_pmdynflags;
#ifdef USE_ITHREADS
- char * op_pmstashpv;
+ IV op_pmoffset;
+#else
+ REGEXP * op_pmregexp; /* compiled expression */
+#endif
+ U32 op_pmflags;
+ union {
+ OP * op_pmreplroot; /* For OP_SUBST */
+#ifdef USE_ITHREADS
+ PADOFFSET op_pmtargetoff; /* For OP_PUSHRE */
#else
- HV * op_pmstash;
+ GV * op_pmtargetgv;
#endif
+ } op_pmreplrootu;
+ union {
+ OP * op_pmreplstart; /* Only used in OP_SUBST */
+#ifdef USE_ITHREADS
+ char * op_pmstashpv; /* Only used in OP_MATCH, with PMf_ONCE set */
+#else
+ HV * op_pmstash;
+#endif
+ } op_pmstashstartu;
};
+#ifdef USE_ITHREADS
+#define PM_GETRE(o) (INT2PTR(REGEXP*,SvIVX(PL_regex_pad[(o)->op_pmoffset])))
+#define PM_SETRE(o,r) STMT_START { \
+ SV* const sv = PL_regex_pad[(o)->op_pmoffset]; \
+ sv_setiv(sv, PTR2IV(r)); \
+ } STMT_END
+#define PM_GETRE_SAFE(o) (PL_regex_pad ? PM_GETRE(o) : (REGEXP*)0)
+#define PM_SETRE_SAFE(o,r) if (PL_regex_pad) PM_SETRE(o,r)
+#else
#define PM_GETRE(o) ((o)->op_pmregexp)
#define PM_SETRE(o,r) ((o)->op_pmregexp = (r))
+#define PM_GETRE_SAFE PM_GETRE
+#define PM_SETRE_SAFE PM_SETRE
+#endif
-#define PMdf_USED 0x01 /* pm has been used once already */
-#define PMdf_TAINTED 0x02 /* pm compiled from tainted pattern */
-#define PMdf_UTF8 0x04 /* pm compiled from utf8 data */
-#define PMdf_DYN_UTF8 0x08
-
-#define PMdf_CMP_UTF8 (PMdf_UTF8|PMdf_DYN_UTF8)
#define PMf_RETAINT 0x0001 /* taint $1 etc. if target tainted */
-#define PMf_ONCE 0x0002 /* use pattern only once per reset */
-#define PMf_REVERSED 0x0004 /* Should be matched right->left */
+#define PMf_ONCE 0x0002 /* match successfully only once per
+ reset, with related flag RXf_USED
+ in re->extflags holding state.
+ This is used only for ?? matches,
+ and only on OP_MATCH and OP_QR */
+
+#define PMf_UNUSED 0x0004 /* free for use */
#define PMf_MAYBE_CONST 0x0008 /* replacement contains variables */
-#define PMf_SKIPWHITE 0x0010 /* skip leading whitespace for split */
-#define PMf_WHITE 0x0020 /* pattern is \s+ */
+
+#define PMf_USED 0x0010 /* PMf_ONCE has matched successfully.
+ Not used under threading. */
+
#define PMf_CONST 0x0040 /* subst replacement is constant */
#define PMf_KEEP 0x0080 /* keep 1st runtime pattern forever */
#define PMf_GLOBAL 0x0100 /* pattern had a g modifier */
#define PMf_CONTINUE 0x0200 /* don't reset pos() if //g fails */
#define PMf_EVAL 0x0400 /* evaluating replacement as expr */
-#define PMf_LOCALE 0x0800 /* use locale for character types */
-#define PMf_MULTILINE 0x1000 /* assume multiple lines */
-#define PMf_SINGLELINE 0x2000 /* assume single line */
-#define PMf_FOLD 0x4000 /* case insensitivity */
-#define PMf_EXTENDED 0x8000 /* chuck embedded whitespace */
-/* mask of bits stored in regexp->reganch */
-#define PMf_COMPILETIME (PMf_MULTILINE|PMf_SINGLELINE|PMf_LOCALE|PMf_FOLD|PMf_EXTENDED)
+/* The following flags have exact equivalents in regcomp.h with the prefix RXf_
+ * which are stored in the regexp->extflags member.
+ */
+#define PMf_LOCALE 0x00800 /* use locale for character types */
+#define PMf_MULTILINE 0x01000 /* assume multiple lines */
+#define PMf_SINGLELINE 0x02000 /* assume single line */
+#define PMf_FOLD 0x04000 /* case insensitivity */
+#define PMf_EXTENDED 0x08000 /* chuck embedded whitespace */
+#define PMf_KEEPCOPY 0x10000 /* copy the string when matching */
+
+/* mask of bits that need to be transfered to re->extflags */
+#define PMf_COMPILETIME (PMf_MULTILINE|PMf_SINGLELINE|PMf_LOCALE|PMf_FOLD|PMf_EXTENDED|PMf_KEEPCOPY)
#ifdef USE_ITHREADS
-# define PmopSTASHPV(o) ((o)->op_pmstashpv)
-# define PmopSTASHPV_set(o,pv) ((o)->op_pmstashpv = ((pv) ? savepv(pv) : Nullch))
+
+# define PmopSTASHPV(o) \
+ (((o)->op_pmflags & PMf_ONCE) ? (o)->op_pmstashstartu.op_pmstashpv : NULL)
+# if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
+# define PmopSTASHPV_set(o,pv) ({ \
+ assert((o)->op_pmflags & PMf_ONCE); \
+ ((o)->op_pmstashstartu.op_pmstashpv = savesharedpv(pv)); \
+ })
+# else
+# define PmopSTASHPV_set(o,pv) \
+ ((o)->op_pmstashstartu.op_pmstashpv = savesharedpv(pv))
+# endif
# define PmopSTASH(o) (PmopSTASHPV(o) \
- ? gv_stashpv(PmopSTASHPV(o),GV_ADD) : Nullhv)
-# define PmopSTASH_set(o,hv) PmopSTASHPV_set(o, (hv) ? HvNAME(hv) : Nullch)
+ ? gv_stashpv((o)->op_pmstashstartu.op_pmstashpv,GV_ADD) : NULL)
+# define PmopSTASH_set(o,hv) PmopSTASHPV_set(o, ((hv) ? HvNAME_get(hv) : NULL))
+# define PmopSTASH_free(o) PerlMemShared_free(PmopSTASHPV(o))
+
#else
-# define PmopSTASH(o) ((o)->op_pmstash)
-# define PmopSTASH_set(o,hv) ((o)->op_pmstash = (hv))
-# define PmopSTASHPV(o) (PmopSTASH(o) ? HvNAME(PmopSTASH(o)) : Nullch)
- /* op_pmstash is not refcounted */
+# define PmopSTASH(o) \
+ (((o)->op_pmflags & PMf_ONCE) ? (o)->op_pmstashstartu.op_pmstash : NULL)
+# if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
+# define PmopSTASH_set(o,hv) ({ \
+ assert((o)->op_pmflags & PMf_ONCE); \
+ ((o)->op_pmstashstartu.op_pmstash = (hv)); \
+ })
+# else
+# define PmopSTASH_set(o,hv) ((o)->op_pmstashstartu.op_pmstash = (hv))
+# endif
+# define PmopSTASHPV(o) (PmopSTASH(o) ? HvNAME_get(PmopSTASH(o)) : NULL)
+ /* op_pmstashstartu.op_pmstash is not refcounted */
# define PmopSTASHPV_set(o,pv) PmopSTASH_set((o), gv_stashpv(pv,GV_ADD))
+# define PmopSTASH_free(o)
#endif
struct svop {
#ifdef USE_ITHREADS
-# define cGVOPx_gv(o) ((GV*)PL_curpad[cPADOPx(o)->op_padix])
-# define IS_PADGV(v) (v && SvTYPE(v) == SVt_PVGV && GvIN_PAD(v))
+# define cGVOPx_gv(o) ((GV*)PAD_SVl(cPADOPx(o)->op_padix))
+# define IS_PADGV(v) (v && SvTYPE(v) == SVt_PVGV && isGV_with_GP(v) \
+ && GvIN_PAD(v))
# define IS_PADCONST(v) (v && SvREADONLY(v))
# define cSVOPx_sv(v) (cSVOPx(v)->op_sv \
- ? cSVOPx(v)->op_sv : PL_curpad[(v)->op_targ])
+ ? cSVOPx(v)->op_sv : PAD_SVl((v)->op_targ))
# define cSVOPx_svp(v) (cSVOPx(v)->op_sv \
- ? &cSVOPx(v)->op_sv : &PL_curpad[(v)->op_targ])
+ ? &cSVOPx(v)->op_sv : &PAD_SVl((v)->op_targ))
#else
# define cGVOPx_gv(o) ((GV*)cSVOPx(o)->op_sv)
# define IS_PADGV(v) FALSE
#define OA_SCALARREF 7
#define OA_OPTIONAL 8
+/* Op_REFCNT is a reference count at the head of each op tree: needed
+ * since the tree is shared between threads, and between cloned closure
+ * copies in the same thread. OP_REFCNT_LOCK/UNLOCK is used when modifying
+ * this count.
+ * The same mutex is used to protect the refcounts of the reg_trie_data
+ * and reg_ac_data structures, which are shared between duplicated
+ * regexes.
+ */
+
#ifdef USE_ITHREADS
# define OP_REFCNT_INIT MUTEX_INIT(&PL_op_mutex)
-# define OP_REFCNT_LOCK MUTEX_LOCK(&PL_op_mutex)
-# define OP_REFCNT_UNLOCK MUTEX_UNLOCK(&PL_op_mutex)
+# ifdef PERL_CORE
+# define OP_REFCNT_LOCK MUTEX_LOCK(&PL_op_mutex)
+# define OP_REFCNT_UNLOCK MUTEX_UNLOCK(&PL_op_mutex)
+# else
+# define OP_REFCNT_LOCK op_refcnt_lock()
+# define OP_REFCNT_UNLOCK op_refcnt_unlock()
+# endif
# define OP_REFCNT_TERM MUTEX_DESTROY(&PL_op_mutex)
#else
# define OP_REFCNT_INIT NOOP
#endif
#define OpREFCNT_set(o,n) ((o)->op_targ = (n))
-#define OpREFCNT_inc(o) ((o) ? (++(o)->op_targ, (o)) : Nullop)
-#define OpREFCNT_dec(o) (--(o)->op_targ)
+#ifdef PERL_DEBUG_READONLY_OPS
+# define OpREFCNT_inc(o) Perl_op_refcnt_inc(aTHX_ o)
+# define OpREFCNT_dec(o) Perl_op_refcnt_dec(aTHX_ o)
+#else
+# define OpREFCNT_inc(o) ((o) ? (++(o)->op_targ, (o)) : NULL)
+# define OpREFCNT_dec(o) (--(o)->op_targ)
+#endif
/* flags used by Perl_load_module() */
#define PERL_LOADMOD_DENY 0x1
#define PERL_LOADMOD_NOIMPORT 0x2
#define PERL_LOADMOD_IMPORT_OPS 0x4
+
+#if defined(PERL_IN_PERLY_C) || defined(PERL_IN_OP_C)
+#define ref(o, type) doref(o, type, TRUE)
+#endif
+
+/* no longer used anywhere in core */
+#ifndef PERL_CORE
+#define cv_ckproto(cv, gv, p) \
+ cv_ckproto_len((cv), (gv), (p), (p) ? strlen(p) : 0)
+#endif
+
+#ifdef USE_REENTRANT_API
+#include "reentr.h"
+#endif
+
+#if defined(PL_OP_SLAB_ALLOC)
+#define NewOp(m,var,c,type) \
+ (var = (type *) Perl_Slab_Alloc(aTHX_ c*sizeof(type)))
+#define NewOpSz(m,var,size) \
+ (var = (OP *) Perl_Slab_Alloc(aTHX_ size))
+#define FreeOp(p) Perl_Slab_Free(aTHX_ p)
+#else
+#define NewOp(m, var, c, type) \
+ (var = (MEM_WRAP_CHECK_(c,type) \
+ (type*)PerlMemShared_calloc(c, sizeof(type))))
+#define NewOpSz(m, var, size) \
+ (var = (OP*)PerlMemShared_calloc(1, size))
+#define FreeOp(p) PerlMemShared_free(p)
+#endif
+
+#ifdef PERL_MAD
+# define MAD_NULL 1
+# define MAD_PV 2
+# define MAD_OP 3
+# define MAD_SV 4
+
+struct madprop {
+ MADPROP* mad_next;
+ void *mad_val;
+ U32 mad_vlen;
+/* short mad_count; */
+ char mad_key;
+ char mad_type;
+};
+
+struct token {
+ I32 tk_type;
+ YYSTYPE tk_lval;
+ MADPROP* tk_mad;
+};
+#endif
+
+/*
+ * Values that can be hold by mad_key :
+ * ^ unfilled head spot
+ * , literal ,
+ * ; literal ; (blank if implicit ; at end of block)
+ * : literal : from ?: or attr list
+ * + unary +
+ * ? literal ? from ?:
+ * ( literal (
+ * ) literal )
+ * [ literal [
+ * ] literal ]
+ * { literal {
+ * } literal }
+ * @ literal @ sigil
+ * $ literal $ sigil
+ * * literal * sigil
+ * ! use is source filtered
+ * & & or sub
+ * # whitespace/comment following ; or }
+ * # $# sigil
+ * 1 1st ; from for(;;)
+ * 1 retired protasis
+ * 2 2nd ; from for(;;)
+ * 2 retired apodosis
+ * 3 C-style for list
+ * a sub or var attributes
+ * a non-method arrow operator
+ * A method arrow operator
+ * A use import args
+ * b format block
+ * B retired stub block
+ * C constant conditional op
+ * d declarator
+ * D do block
+ * e unreached "else" (see C)
+ * e expression producing E
+ * E tr/E/R/, /E/
+ * f folded constant op
+ * F peg op for format
+ * i if/unless modifier
+ * I if/elsif/unless statement
+ * K retired kid op
+ * l last index of array ($#foo)
+ * L label
+ * m modifier on regex
+ * M my assignment slurped into some other operator's target
+ * n sub or format name
+ * o current operator/declarator name
+ * o else/continue
+ * O generic optimized op
+ * p peg to hold extra whitespace at statement level
+ * P peg op for package declaration
+ * q opening quote
+ * = quoted material
+ * Q closing quote
+ * Q optimized qw//
+ * r expression producing R
+ * R tr/E/R/ s/E/R/
+ * R assign slurped by split
+ * s sub signature
+ * S use import stub (no import)
+ * S retired sort block
+ * t unreached "then" (see C)
+ * U use import op
+ * v private sv of for loop
+ * V use version
+ * w while/until modifier
+ * W while/for statement
+ * x optimized qw
+ * X random thing
+ * _ whitespace/comments preceding anything else
+ * ~ =~ operator
+ */
+
+/*
+ * Local variables:
+ * c-indentation-style: bsd
+ * c-basic-offset: 4
+ * indent-tabs-mode: t
+ * End:
+ *
+ * ex: set ts=8 sts=4 sw=4 noet:
+ */
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