Provided by: perl-doc_5.18.2-2ubuntu1.7_all 
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, then that child's "CvOUTSIDE" is set to point to its grandparent. This will only occur
in the single specific case of a non-closure anon prototype having one or more active references
(such as $a above).
One other thing to consider is that a CV may be merely undefined rather than freed, eg "undef
&foo". In this case, its refcount may not have reached zero, but we still delete its pad and its
"CvROOT" etc. Since various children may still have their "CvOUTSIDE" pointing at this undefined
CV, we keep its own "CvOUTSIDE" for the time being, so that the chain of lexical scopes is
unbroken. For example, the following should print 123:
my $x = 123;
sub tmp { sub { eval '$x' } }
my $a = tmp();
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)
cv_forget_slab
When a CV has a reference count on its slab (CvSLABBED), it is responsible for making sure it is
freed. (Hence, no two CVs should ever have a reference count on the same slab.) The CV only
needs to reference the slab during compilation. Once it is compiled and CvROOT attached, it has
finished its job, so it can forget the slab.
void cv_forget_slab(CV *cv)
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. This is called during parsing at the end of each
statement to make lexical variables visible to subsequent statements.
U32 intro_my()
padlist_dup
Duplicates a pad.
PADLIST * padlist_dup(PADLIST *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
Find a named lexical anywhere in a chain of nested pads. Add fake entries in the inner pads if
it's found in an outer one.
Returns the offset in the bottom pad of the lex or the fake lex. cv is the CV in which to start
the search, and seq is the current cop_seq to match against. If warn is true, print appropriate
warnings. The out_* vars return values, and so are pointers to where the returned values should
be stored. out_capture, if non-null, requests that the innermost instance of the lexical is
captured; out_name_sv is set to the innermost matched namesv or fake namesv; out_flags returns
the flags normally associated with the IVX field of a fake namesv.
Note that pad_findlex() is recursive; it recurses up the chain of CVs, then comes back down,
adding fake entries as it goes. It has to be this way because fake namesvs in anon protoypes have
to store in 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 not be equal to 0 or -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.
0 is used as continue inside eval,
3 is used for a die caught by an inner eval - continue inner loop
See cop.h: je_mustcatch, when set at any runlevel to TRUE, means eval ops must establish a local
jmpenv to handle exception traps.
OP* docatch(OP *o)
GV Functions
gv_try_downgrade
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 &PL_sv_placeholder if there is no value associated with the key.
SV * refcounted_he_fetch_pvn(
const struct refcounted_he *chain,
const char *keypv, STRLEN keylen, U32 hash,
U32 flags
)
refcounted_he_fetch_pvs
Like "refcounted_he_fetch_pvn", but takes a literal string instead of a string/length pair, and
no precomputed hash.
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.
parent points to the rest of the "refcounted_he" chain to be attached to the new "refcounted_he".
This function takes ownership of one reference to parent, and returns one reference to the new
"refcounted_he".
struct refcounted_he * refcounted_he_new_pvn(
struct refcounted_he *parent,
const char *keypv,
STRLEN keylen, U32 hash,
SV *value, U32 flags
)
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
PL_sv_undef
The arguments themselves are any values following the "flags" argument.
Returns the SV (if any) returned by the method, or NULL on failure.
SV* magic_methcall(SV *sv, const MAGIC *mg,
const char *meth, U32 flags,
U32 argc, ...)
magic_sethint
Triggered by a store to %^H, records the key/value pair to "PL_compiling.cop_hints_hash". It is
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 thread-safe.
void finalize_optree(OP* o)
Pad Data Structures
CX_CURPAD_SAVE
Save the current pad in the given context block structure.
void CX_CURPAD_SAVE(struct context)
CX_CURPAD_SV
Access the SV at offset po in the saved current pad in the given context block structure (can be
used as an lvalue).
SV * CX_CURPAD_SV(struct context, PADOFFSET po)
PadnameIsOUR
Whether this is an "our" variable.
bool PadnameIsOUR(PADNAME pn)
PadnameIsSTATE
Whether this is a "state" variable.
bool PadnameIsSTATE(PADNAME pn)
PadnameOURSTASH
The stash in which this "our" variable was declared.
HV * PadnameOURSTASH()
PadnameOUTER
Whether this entry belongs to an outer pad.
bool PadnameOUTER(PADNAME pn)
PadnameTYPE
The stash associated with a typed lexical. This returns the %Foo:: hash for "my Foo $bar".
HV * PadnameTYPE(PADNAME pn)
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.
void pad_peg(const char *s)
PAD_RESTORE_LOCAL
Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL()
void PAD_RESTORE_LOCAL(PAD *opad)
PAD_SAVE_LOCAL
Save the current pad to the local variable opad, then make the current pad equal to npad
void PAD_SAVE_LOCAL(PAD *opad, PAD *npad)
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".
SV * PL_DBsingle
PL_DBsub
When Perl is run in debugging mode, with the -d switch, this GV contains the SV which holds the
name of the sub being debugged. This is the C variable which corresponds to Perl's $DB::sub
variable. See "PL_DBsingle".
GV * PL_DBsub
PL_DBtrace
Trace variable used when Perl is run in debugging mode, with the -d switch. This is the C
variable 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
SvTHINKFIRST
A quick flag check to see whether an sv should be passed to sv_force_normal to be "downgraded"
before SvIVX or SvPVX can be modified directly.
For example, if your scalar is a reference and you want to modify the SvIVX slot, you can't just
do SvROK_off, as that will leak the referent.
This is used internally by various sv-modifying functions, such as sv_setsv, sv_setiv and
sv_pvn_force.
One case that this does not handle is a gv without SvFAKE set. After
if (SvTHINKFIRST(gv)) sv_force_normal(gv);
it will still be a gv.
SvTHINKFIRST sometimes produces false positives. In those cases sv_force_normal does nothing.
U32 SvTHINKFIRST(SV *sv)
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.
void sv_free_arenas()
SV-Body Allocation
sv_2num Return an SV with the numeric value of the source SV, doing any necessary reference or overload
conversion. You must use the "SvNUM(sv)" macro to access this function.
NOTE: this function is experimental and may change or be removed without notice.
SV* sv_2num(SV *const sv)
sv_copypv
Copies a stringified representation of the source SV into the destination SV. Automatically
performs any necessary mg_get and coercion of numeric values into strings. Guaranteed to
preserve UTF8 flag even from overloaded objects. Similar in nature to sv_2pv[_flags] but
operates directly on an SV instead of just the string. Mostly uses sv_2pv_flags to do its work,
except when that would lose the UTF-8'ness of the PV.
void sv_copypv(SV *const dsv, SV *const ssv)
sv_ref Returns a SV describing what the SV passed in is a reference to.
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.
Perl_croak_memory_wrap
Slab_Alloc
Slab_Free
Slab_to_ro
Slab_to_rw
_add_range_to_invlist
_core_swash_init
_get_invlist_len_addr
_get_swash_invlist
_invlist_array_init
_invlist_contains_cp
_invlist_contents
_invlist_intersection
_invlist_intersection_maybe_complement_2nd
_invlist_invert
_invlist_invert_prop
_invlist_len
_invlist_populate_swatch
_invlist_search
_invlist_subtract
_invlist_union
_invlist_union_maybe_complement_2nd
_new_invlist
_swash_inversion_hash
_swash_to_invlist
_to_fold_latin1
_to_upper_title_latin1
aassign_common_vars
add_cp_to_invlist
addmad
alloc_maybe_populate_EXACT
allocmy
amagic_is_enabled
append_madprops
apply
av_extend_guts
av_reify
bind_match
block_end
block_start
boot_core_PerlIO
boot_core_UNIVERSAL
boot_core_mro
cando
check_utf8_print
ck_entersub_args_core
compute_EXACTish
convert
coresub_op
create_eval_scope
croak_no_mem
croak_popstack
current_re_engine
cv_ckproto_len_flags
cv_clone_into
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_lexical_cv
find_runcv_where
find_rundefsv2
find_script
free_tied_hv_pool
get_and_check_backslash_N_name
get_db_sub
get_debug_opts
get_hash_seed
get_invlist_iter_addr
get_invlist_previous_index_addr
get_invlist_version_id_addr
get_invlist_zero_addr
get_no_modify
get_opargs
get_re_arg
getenv_len
grok_bslash_x
hfree_next_entry
hv_backreferences_p
hv_kill_backrefs
hv_undef_flags
init_argv_symbols
init_constants
init_dbargs
init_debugger
invert
invlist_array
invlist_clone
invlist_highest
invlist_is_iterating
invlist_iterfinish
invlist_iterinit
invlist_max
invlist_previous_index
invlist_set_len
invlist_set_previous_index
invlist_trim
io_close
isALNUM_lazy
isIDFIRST_lazy
is_utf8_char_slow
is_utf8_common
jmaybe
keyword
keyword_plugin_standard
list
localize
mad_free
madlex
madparse
magic_clear_all_env
magic_cleararylen_p
magic_clearenv
magic_clearisa
magic_clearpack
magic_clearsig
magic_copycallchecker
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_nextpack
magic_regdata_cnt
magic_regdatum_get
magic_regdatum_set
magic_scalarpack
magic_set
magic_set_all_env
magic_setarylen
magic_setcollxfrm
magic_setdbline
magic_setdefelem
magic_setenv
magic_setisa
magic_setmglob
magic_setnkeys
magic_setpack
magic_setpos
magic_setregexp
magic_setsig
magic_setsubstr
magic_settaint
magic_setutf8
magic_setuvar
magic_setvec
magic_sizepack
magic_wipepack
malloc_good_size
malloced_size
mem_collxfrm
mode_from_discipline
more_bodies
mro_meta_dup
mro_meta_init
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
newSTUB
newTOKEN
newXS_len_flags
new_warnings_bitfield
nextargv
oopsAV
oopsHV
op_clear
op_const_sv
op_getmad
op_getmad_weak
op_integerize
op_lvalue_flags
op_refcnt_dec
op_refcnt_inc
op_std_init
op_unscope
op_xmldump
opslab_force_free
opslab_free
opslab_free_nopad
package
package_version
padlist_store
parse_unicode_opts
parser_free
parser_free_nexttoke_ops
peep
pmop_xmldump
pmruntime
populate_isa
prepend_madprops
qerror
re_op_compile
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
regpposixcc
regprop
report_evil_fh
report_redefined_cv
report_wrongway_fh
rpeep
rsignal_restore
rsignal_save
rxres_save
same_dirent
sawparens
scalar
scalarvoid
sighandler
softref2xv
sub_crush_depth
sv_add_backref
sv_catxmlpv
sv_catxmlpvn
sv_catxmlsv
sv_del_backref
sv_free2
sv_kill_backrefs
sv_len_utf8_nomg
sv_mortalcopy_flags
sv_resetpvn
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
varname
vivify_defelem
vivify_ref
wait4pid
was_lvalue_sub
watch
win32_croak_not_implemented
write_to_stderr
xmldump_all
xmldump_all_perl
xmldump_eval
xmldump_form
xmldump_indent
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 v5.18.2 2018-11-20 PERLINTERN(1)