PERLINTERN(1) Perl Programmers Reference Guide PERLINTERN(1)
NAME
perlintern - autogenerated documentation of purely internal Perl functions
DESCRIPTION
This file is the autogenerated documentation of functions in the Perl interpreter that are documented using
Perl's internal documentation format but are not marked as part of the Perl API. In other words, they are not
for use in extensions!
Compile-time scope hooks
BhkENTRY
Return an entry from the BHK structure. which is a preprocessor token indicating which entry to
return. If the appropriate flag is not set this will return NULL. The type of the return value depends
on which entry you ask for.
NOTE: this function is experimental and may change or be removed without notice.
void * BhkENTRY(BHK *hk, which)
BhkFLAGS
Return the BHK's flags.
NOTE: this function is experimental and may change or be removed without notice.
U32 BhkFLAGS(BHK *hk)
CALL_BLOCK_HOOKS
Call all the registered block hooks for type which. which is a preprocessing token; the type of arg
depends on which.
NOTE: this function is experimental and may change or be removed without notice.
void CALL_BLOCK_HOOKS(which, arg)
CV reference counts and CvOUTSIDE
CvWEAKOUTSIDE
Each CV has a pointer, "CvOUTSIDE()", to its lexically enclosing CV (if any). Because pointers to
anonymous sub prototypes are stored in "&" pad slots, it is a possible to get a circular reference,
with the parent pointing to the child and vice-versa. To avoid the ensuing memory leak, we do not
increment the reference count of the CV pointed to by "CvOUTSIDE" in the one specific instance that
the parent has a "&" pad slot pointing back to us. In this case, we set the "CvWEAKOUTSIDE" flag in
the child. This allows us to determine under what circumstances we should decrement the refcount of
the parent when freeing the child.
There is a further complication with non-closure anonymous subs (i.e. those that do not refer to any
lexicals outside that sub). In this case, the anonymous prototype is shared rather than being cloned.
This has the consequence that the parent may be freed while there are still active children, eg
BEGIN { $a = sub { eval '$x' } }
In this case, the BEGIN is freed immediately after execution since there are no active references to
it: the anon sub prototype has "CvWEAKOUTSIDE" set since it's not a closure, and $a points to the same
CV, so it doesn't contribute to BEGIN's refcount either. When $a is executed, the "eval '$x'" causes
the chain of "CvOUTSIDE"s to be followed, and the freed BEGIN is accessed.
To avoid this, whenever a CV and its associated pad is freed, any "&" entries in the pad are
explicitly removed from the pad, and if the refcount of the pointed-to anon sub is still positive,
undef &tmp;
print $a->();
bool CvWEAKOUTSIDE(CV *cv)
Embedding Functions
cv_dump dump the contents of a CV
void cv_dump(CV *cv, const char *title)
do_dump_pad
Dump the contents of a padlist
void do_dump_pad(I32 level, PerlIO *file,
PADLIST *padlist, int full)
intro_my
"Introduce" my variables to visible status.
U32 intro_my()
padlist_dup
Duplicates a pad.
AV * padlist_dup(AV *srcpad, CLONE_PARAMS *param)
pad_alloc_name
Allocates a place in the currently-compiling pad (via "pad_alloc" in perlapi) and then stores a name
for that entry. namesv is adopted and becomes the name entry; it must already contain the name string
and be sufficiently upgraded. typestash and ourstash and the "padadd_STATE" flag get added to namesv.
None of the other processing of "pad_add_name_pvn" in perlapi is done. Returns the offset of the
allocated pad slot.
PADOFFSET pad_alloc_name(SV *namesv, U32 flags,
HV *typestash, HV *ourstash)
pad_block_start
Update the pad compilation state variables on entry to a new block
void pad_block_start(int full)
pad_check_dup
Check for duplicate declarations: report any of:
* a my in the current scope with the same name;
* an our (anywhere in the pad) with the same name and the
same stash as C<ourstash>
"is_our" indicates that the name to check is an 'our' declaration.
void pad_check_dup(SV *name, U32 flags,
const HV *ourstash)
pad_findlex
xlow the index into the parent pad.
PADOFFSET pad_findlex(const char *namepv,
STRLEN namelen, U32 flags,
const CV* cv, U32 seq, int warn,
SV** out_capture,
SV** out_name_sv, int *out_flags)
pad_fixup_inner_anons
For any anon CVs in the pad, change CvOUTSIDE of that CV from old_cv to new_cv if necessary. Needed
when a newly-compiled CV has to be moved to a pre-existing CV struct.
void pad_fixup_inner_anons(PADLIST *padlist,
CV *old_cv, CV *new_cv)
pad_free
Free the SV at offset po in the current pad.
void pad_free(PADOFFSET po)
pad_leavemy
Cleanup at end of scope during compilation: set the max seq number for lexicals in this scope and warn
of any lexicals that never got introduced.
void pad_leavemy()
pad_push
Push a new pad frame onto the padlist, unless there's already a pad at this depth, in which case don't
bother creating a new one. Then give the new pad an @_ in slot zero.
void pad_push(PADLIST *padlist, int depth)
pad_reset
Mark all the current temporaries for reuse
void pad_reset()
pad_swipe
Abandon the tmp in the current pad at offset po and replace with a new one.
void pad_swipe(PADOFFSET po, bool refadjust)
Functions in file op.c
core_prototype
This function assigns the prototype of the named core function to "sv", or to a new mortal SV if "sv"
is NULL. It returns the modified "sv", or NULL if the core function has no prototype. "code" is a
code as returned by "keyword()". It must be negative and unequal to -KEY_CORE.
SV * core_prototype(SV *sv, const char *name,
const int code,
int * const opnum)
Functions in file pp_ctl.c
docatch Check for the cases 0 or 3 of cur_env.je_ret, only used inside an eval context.
If the typeglob "gv" can be expressed more succinctly, by having something other than a real GV in its
place in the stash, replace it with the optimised form. Basic requirements for this are that "gv" is
a real typeglob, is sufficiently ordinary, and is only referenced from its package. This function is
meant to be used when a GV has been looked up in part to see what was there, causing upgrading, but
based on what was found it turns out that the real GV isn't required after all.
If "gv" is a completely empty typeglob, it is deleted from the stash.
If "gv" is a typeglob containing only a sufficiently-ordinary constant sub, the typeglob is replaced
with a scalar-reference placeholder that more compactly represents the same thing.
NOTE: this function is experimental and may change or be removed without notice.
void gv_try_downgrade(GV* gv)
Hash Manipulation Functions
hv_ename_add
Adds a name to a stash's internal list of effective names. See "hv_ename_delete".
This is called when a stash is assigned to a new location in the symbol table.
void hv_ename_add(HV *hv, const char *name, U32 len,
U32 flags)
hv_ename_delete
Removes a name from a stash's internal list of effective names. If this is the name returned by
"HvENAME", then another name in the list will take its place ("HvENAME" will use it).
This is called when a stash is deleted from the symbol table.
void hv_ename_delete(HV *hv, const char *name,
U32 len, U32 flags)
refcounted_he_chain_2hv
Generates and returns a "HV *" representing the content of a "refcounted_he" chain. flags is
currently unused and must be zero.
HV * refcounted_he_chain_2hv(
const struct refcounted_he *c, U32 flags
)
refcounted_he_fetch_pv
Like "refcounted_he_fetch_pvn", but takes a nul-terminated string instead of a string/length pair.
SV * refcounted_he_fetch_pv(
const struct refcounted_he *chain,
const char *key, U32 hash, U32 flags
)
refcounted_he_fetch_pvn
Search along a "refcounted_he" chain for an entry with the key specified by keypv and keylen. If
flags has the "REFCOUNTED_HE_KEY_UTF8" bit set, the key octets are interpreted as UTF-8, otherwise
they are interpreted as Latin-1. hash is a precomputed hash of the key string, or zero if it has not
been precomputed. Returns a mortal scalar representing the value associated with the key, or
SV * refcounted_he_fetch_pvs(
const struct refcounted_he *chain,
const char *key, U32 flags
)
refcounted_he_fetch_sv
Like "refcounted_he_fetch_pvn", but takes a Perl scalar instead of a string/length pair.
SV * refcounted_he_fetch_sv(
const struct refcounted_he *chain, SV *key,
U32 hash, U32 flags
)
refcounted_he_free
Decrements the reference count of a "refcounted_he" by one. If the reference count reaches zero the
structure's memory is freed, which (recursively) causes a reduction of its parent "refcounted_he"'s
reference count. It is safe to pass a null pointer to this function: no action occurs in this case.
void refcounted_he_free(struct refcounted_he *he)
refcounted_he_inc
Increment the reference count of a "refcounted_he". The pointer to the "refcounted_he" is also
returned. It is safe to pass a null pointer to this function: no action occurs and a null pointer is
returned.
struct refcounted_he * refcounted_he_inc(
struct refcounted_he *he
)
refcounted_he_new_pv
Like "refcounted_he_new_pvn", but takes a nul-terminated string instead of a string/length pair.
struct refcounted_he * refcounted_he_new_pv(
struct refcounted_he *parent,
const char *key, U32 hash,
SV *value, U32 flags
)
refcounted_he_new_pvn
Creates a new "refcounted_he". This consists of a single key/value pair and a reference to an
existing "refcounted_he" chain (which may be empty), and thus forms a longer chain. When using the
longer chain, the new key/value pair takes precedence over any entry for the same key further along
the chain.
The new key is specified by keypv and keylen. If flags has the "REFCOUNTED_HE_KEY_UTF8" bit set, the
key octets are interpreted as UTF-8, otherwise they are interpreted as Latin-1. hash is a precomputed
hash of the key string, or zero if it has not been precomputed.
value is the scalar value to store for this key. value is copied by this function, which thus does
not take ownership of any reference to it, and later changes to the scalar will not be reflected in
the value visible in the "refcounted_he". Complex types of scalar will not be stored with referential
integrity, but will be coerced to strings. value may be either null or &PL_sv_placeholder to indicate
that no value is to be associated with the key; this, as with any non-null value, takes precedence
over the existence of a value for the key further along the chain.
refcounted_he_new_pvs
Like "refcounted_he_new_pvn", but takes a literal string instead of a string/length pair, and no
precomputed hash.
struct refcounted_he * refcounted_he_new_pvs(
struct refcounted_he *parent,
const char *key, SV *value,
U32 flags
)
refcounted_he_new_sv
Like "refcounted_he_new_pvn", but takes a Perl scalar instead of a string/length pair.
struct refcounted_he * refcounted_he_new_sv(
struct refcounted_he *parent,
SV *key, U32 hash, SV *value,
U32 flags
)
IO Functions
start_glob
Function called by "do_readline" to spawn a glob (or do the glob inside perl on VMS). This code used
to be inline, but now perl uses "File::Glob" this glob starter is only used by miniperl during the
build process. Moving it away shrinks pp_hot.c; shrinking pp_hot.c helps speed perl up.
NOTE: this function is experimental and may change or be removed without notice.
PerlIO* start_glob(SV *tmpglob, IO *io)
Magical Functions
magic_clearhint
Triggered by a delete from %^H, records the key to "PL_compiling.cop_hints_hash".
int magic_clearhint(SV* sv, MAGIC* mg)
magic_clearhints
Triggered by clearing %^H, resets "PL_compiling.cop_hints_hash".
int magic_clearhints(SV* sv, MAGIC* mg)
magic_methcall
Invoke a magic method (like FETCH).
"sv" and "mg" are the tied thingy and the tie magic.
"meth" is the name of the method to call.
"argc" is the number of args (in addition to $self) to pass to the method.
The "flags" can be:
G_DISCARD invoke method with G_DISCARD flag and don't
return a value
G_UNDEF_FILL fill the stack with argc pointers to
assumed that hints aren't storing anything that would need a deep copy. Maybe we should warn if we
find a reference.
int magic_sethint(SV* sv, MAGIC* mg)
mg_localize
Copy some of the magic from an existing SV to new localized version of that SV. Container magic (eg
%ENV, $1, tie) gets copied, value magic doesn't (eg taint, pos).
If setmagic is false then no set magic will be called on the new (empty) SV. This typically means
that assignment will soon follow (e.g. 'local $x = $y'), and that will handle the magic.
void mg_localize(SV* sv, SV* nsv, bool setmagic)
MRO Functions
mro_get_linear_isa_dfs
Returns the Depth-First Search linearization of @ISA the given stash. The return value is a read-only
AV*. "level" should be 0 (it is used internally in this function's recursion).
You are responsible for "SvREFCNT_inc()" on the return value if you plan to store it anywhere semi-
permanently (otherwise it might be deleted out from under you the next time the cache is invalidated).
AV* mro_get_linear_isa_dfs(HV* stash, U32 level)
mro_isa_changed_in
Takes the necessary steps (cache invalidations, mostly) when the @ISA of the given package has
changed. Invoked by the "setisa" magic, should not need to invoke directly.
void mro_isa_changed_in(HV* stash)
mro_package_moved
Call this function to signal to a stash that it has been assigned to another spot in the stash
hierarchy. "stash" is the stash that has been assigned. "oldstash" is the stash it replaces, if any.
"gv" is the glob that is actually being assigned to.
This can also be called with a null first argument to indicate that "oldstash" has been deleted.
This function invalidates isa caches on the old stash, on all subpackages nested inside it, and on the
subclasses of all those, including non-existent packages that have corresponding entries in "stash".
It also sets the effective names ("HvENAME") on all the stashes as appropriate.
If the "gv" is present and is not in the symbol table, then this function simply returns. This
checked will be skipped if "flags & 1".
void mro_package_moved(HV * const stash,
HV * const oldstash,
const GV * const gv,
U32 flags)
Optree Manipulation Functions
finalize_optree
This function finalizes the optree. Should be called directly after the complete optree is built. It
does some additional checking which can't be done in the normal ck_xxx functions and makes the tree
as an lvalue).
SV * CX_CURPAD_SV(struct context, PADOFFSET po)
PAD_BASE_SV
Get the value from slot "po" in the base (DEPTH=1) pad of a padlist
SV * PAD_BASE_SV(PADLIST padlist, PADOFFSET po)
PAD_CLONE_VARS
Clone the state variables associated with running and compiling pads.
void PAD_CLONE_VARS(PerlInterpreter *proto_perl,
CLONE_PARAMS* param)
PAD_COMPNAME_FLAGS
Return the flags for the current compiling pad name at offset "po". Assumes a valid slot entry.
U32 PAD_COMPNAME_FLAGS(PADOFFSET po)
PAD_COMPNAME_GEN
The generation number of the name at offset "po" in the current compiling pad (lvalue). Note that
"SvUVX" is hijacked for this purpose.
STRLEN PAD_COMPNAME_GEN(PADOFFSET po)
PAD_COMPNAME_GEN_set
Sets the generation number of the name at offset "po" in the current ling pad (lvalue) to "gen". Note
that "SvUV_set" is hijacked for this purpose.
STRLEN PAD_COMPNAME_GEN_set(PADOFFSET po, int gen)
PAD_COMPNAME_OURSTASH
Return the stash associated with an "our" variable. Assumes the slot entry is a valid "our" lexical.
HV * PAD_COMPNAME_OURSTASH(PADOFFSET po)
PAD_COMPNAME_PV
Return the name of the current compiling pad name at offset "po". Assumes a valid slot entry.
char * PAD_COMPNAME_PV(PADOFFSET po)
PAD_COMPNAME_TYPE
Return the type (stash) of the current compiling pad name at offset "po". Must be a valid name.
Returns null if not typed.
HV * PAD_COMPNAME_TYPE(PADOFFSET po)
pad_peg When PERL_MAD is enabled, this is a small no-op function that gets called at the start of each pad-
related function. It can be breakpointed to track all pad operations. The parameter is a string
indicating the type of pad operation being performed.
NOTE: this function is experimental and may change or be removed without notice.
PAD_SAVE_SETNULLPAD
Save the current pad then set it to null.
void PAD_SAVE_SETNULLPAD()
PAD_SETSV
Set the slot at offset "po" in the current pad to "sv"
SV * PAD_SETSV(PADOFFSET po, SV* sv)
PAD_SET_CUR
Set the current pad to be pad "n" in the padlist, saving the previous current pad. NB currently this
macro expands to a string too long for some compilers, so it's best to replace it with
SAVECOMPPAD();
PAD_SET_CUR_NOSAVE(padlist,n);
void PAD_SET_CUR(PADLIST padlist, I32 n)
PAD_SET_CUR_NOSAVE
like PAD_SET_CUR, but without the save
void PAD_SET_CUR_NOSAVE(PADLIST padlist, I32 n)
PAD_SV Get the value at offset "po" in the current pad
void PAD_SV(PADOFFSET po)
PAD_SVl Lightweight and lvalue version of "PAD_SV". Get or set the value at offset "po" in the current pad.
Unlike "PAD_SV", does not print diagnostics with -DX. For internal use only.
SV * PAD_SVl(PADOFFSET po)
SAVECLEARSV
Clear the pointed to pad value on scope exit. (i.e. the runtime action of 'my')
void SAVECLEARSV(SV **svp)
SAVECOMPPAD
save PL_comppad and PL_curpad
void SAVECOMPPAD()
SAVEPADSV
Save a pad slot (used to restore after an iteration)
XXX DAPM it would make more sense to make the arg a PADOFFSET void SAVEPADSV(PADOFFSET po)
Per-Interpreter Variables
PL_DBsingle
When Perl is run in debugging mode, with the -d switch, this SV is a boolean which indicates whether
subs are being single-stepped. Single-stepping is automatically turned on after every step. This is
the C variable which corresponds to Perl's $DB::single variable. See "PL_DBsub".
which corresponds to Perl's $DB::trace variable. See "PL_DBsingle".
SV * PL_DBtrace
PL_dowarn
The C variable which corresponds to Perl's $^W warning variable.
bool PL_dowarn
PL_last_in_gv
The GV which was last used for a filehandle input operation. ("<FH>")
GV* PL_last_in_gv
PL_ofsgv
The glob containing the output field separator - "*," in Perl space.
GV* PL_ofsgv
PL_rs The input record separator - $/ in Perl space.
SV* PL_rs
Stack Manipulation Macros
djSP Declare Just "SP". This is actually identical to "dSP", and declares a local copy of perl's stack
pointer, available via the "SP" macro. See "SP". (Available for backward source code compatibility
with the old (Perl 5.005) thread model.)
djSP;
LVRET True if this op will be the return value of an lvalue subroutine
SV Manipulation Functions
sv_add_arena
Given a chunk of memory, link it to the head of the list of arenas, and split it into a list of free
SVs.
void sv_add_arena(char *const ptr, const U32 size,
const U32 flags)
sv_clean_all
Decrement the refcnt of each remaining SV, possibly triggering a cleanup. This function may have to
be called multiple times to free SVs which are in complex self-referential hierarchies.
I32 sv_clean_all()
sv_clean_objs
Attempt to destroy all objects not yet freed.
void sv_clean_objs()
sv_free_arenas
Deallocate the memory used by all arenas. Note that all the individual SV heads and bodies within the
arenas must already have been freed.
SV* sv_ref(SV *dst, const SV *const sv,
const int ob)
Unicode Support
find_uninit_var
Find the name of the undefined variable (if any) that caused the operator to issue a "Use of
uninitialized value" warning. If match is true, only return a name if its value matches uninit_sv.
So roughly speaking, if a unary operator (such as OP_COS) generates a warning, then following the
direct child of the op may yield an OP_PADSV or OP_GV that gives the name of the undefined variable.
On the other hand, with OP_ADD there are two branches to follow, so we only print the variable name if
we get an exact match.
The name is returned as a mortal SV.
Assumes that PL_op is the op that originally triggered the error, and that PL_comppad/PL_curpad points
to the currently executing pad.
NOTE: this function is experimental and may change or be removed without notice.
SV* find_uninit_var(const OP *const obase,
const SV *const uninit_sv,
bool top)
report_uninit
Print appropriate "Use of uninitialized variable" warning.
void report_uninit(const SV *uninit_sv)
Undocumented functions
The following functions are currently undocumented. If you use one of them, you may wish to consider creating
and submitting documentation for it.
_add_range_to_invlist
_core_swash_init
_invlist_array_init
_invlist_contents
_invlist_intersection
_invlist_intersection_maybe_complement_2nd
_invlist_invert
_invlist_invert_prop
_invlist_populate_swatch
_invlist_subtract
_invlist_union
_invlist_union_maybe_complement_2nd
_is_utf8__perl_idstart
_new_invlist
_swash_inversion_hash
_swash_to_invlist
_to_fold_latin1
_to_upper_title_latin1
aassign_common_vars
add_cp_to_invlist
addmad
check_utf8_print
ck_entersub_args_core
convert
coresub_op
create_eval_scope
cv_ckproto_len_flags
cvgv_set
cvstash_set
deb_stack_all
delete_eval_scope
die_unwind
do_aexec
do_aexec5
do_eof
do_exec
do_exec3
do_execfree
do_ipcctl
do_ipcget
do_msgrcv
do_msgsnd
do_ncmp
do_op_xmldump
do_pmop_xmldump
do_print
do_readline
do_seek
do_semop
do_shmio
do_sysseek
do_tell
do_trans
do_vecget
do_vecset
do_vop
dofile
dump_all_perl
dump_packsubs_perl
dump_sub_perl
dump_sv_child
emulate_cop_io
feature_is_enabled
find_rundefsv2
find_script
free_tied_hv_pool
get_db_sub
get_debug_opts
get_hash_seed
get_invlist_iter_addr
get_invlist_len_addr
get_invlist_version_id_addr
get_invlist_zero_addr
get_no_modify
get_opargs
invlist_iterinit
invlist_len
invlist_max
invlist_set_len
invlist_trim
io_close
is_utf8_X_L
is_utf8_X_LV
is_utf8_X_LVT
is_utf8_X_LV_LVT_V
is_utf8_X_T
is_utf8_X_V
is_utf8_X_begin
is_utf8_X_extend
is_utf8_X_non_hangul
is_utf8_X_prepend
jmaybe
keyword
keyword_plugin_standard
list
localize
mad_free
madlex
madparse
magic_clear_all_env
magic_clearenv
magic_clearisa
magic_clearpack
magic_clearsig
magic_existspack
magic_freearylen_p
magic_freeovrld
magic_get
magic_getarylen
magic_getdefelem
magic_getnkeys
magic_getpack
magic_getpos
magic_getsig
magic_getsubstr
magic_gettaint
magic_getuvar
magic_getvec
magic_killbackrefs
magic_len
magic_nextpack
magic_regdata_cnt
magic_regdatum_get
magic_regdatum_set
magic_scalarpack
magic_set
magic_set_all_env
magic_setamagic
magic_setarylen
magic_settaint
magic_setutf8
magic_setuvar
magic_setvec
magic_setvstring
magic_sizepack
magic_wipepack
malloc_good_size
malloced_size
mem_collxfrm
mode_from_discipline
more_bodies
mro_meta_dup
mro_meta_init
munge_qwlist_to_paren_list
my_attrs
my_betoh16
my_betoh32
my_betoh64
my_betohi
my_betohl
my_betohs
my_clearenv
my_htobe16
my_htobe32
my_htobe64
my_htobei
my_htobel
my_htobes
my_htole16
my_htole32
my_htole64
my_htolei
my_htolel
my_htoles
my_letoh16
my_letoh32
my_letoh64
my_letohi
my_letohl
my_letohs
my_lstat_flags
my_stat_flags
my_swabn
my_unexec
newATTRSUB_flags
newGP
newMADPROP
newMADsv
newTOKEN
newXS_len_flags
new_warnings_bitfield
nextargv
oopsAV
package_version
parse_unicode_opts
parser_free
peep
pending_Slabs_to_ro
pmop_xmldump
pmruntime
populate_isa
prepend_madprops
qerror
reg_named_buff
reg_named_buff_iter
reg_numbered_buff_fetch
reg_numbered_buff_length
reg_numbered_buff_store
reg_qr_package
reg_temp_copy
regcurly
regprop
report_evil_fh
report_redefined_cv
report_wrongway_fh
rpeep
rsignal_restore
rsignal_save
rxres_save
same_dirent
sawparens
scalar
scalarvoid
set_regclass_bit
sighandler
softref2xv
sub_crush_depth
sv_add_backref
sv_catxmlpv
sv_catxmlpvn
sv_catxmlsv
sv_compile_2op_is_broken
sv_del_backref
sv_free2
sv_kill_backrefs
sv_sethek
sv_setsv_cow
sv_unglob
sv_xmlpeek
tied_method
token_free
token_getmad
translate_substr_offsets
try_amagic_bin
try_amagic_un
unshare_hek
utilize
xmldump_packsubs
xmldump_packsubs_perl
xmldump_sub
xmldump_sub_perl
xmldump_vindent
xs_apiversion_bootcheck
xs_version_bootcheck
yyerror
yyerror_pv
yyerror_pvn
yylex
yyparse
yyunlex
AUTHORS
The autodocumentation system was originally added to the Perl core by Benjamin Stuhl. Documentation is by
whoever was kind enough to document their functions.
SEE ALSO
perlguts, perlapi
perl v5.16.3 2016-11-06 PERLINTERN(1)
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