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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!

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



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               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)

Functions in file pad.h
       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)

       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)




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       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_DUP Clone a padlist.

                       void    PAD_DUP(PADLIST dstpad, PADLIST srcpad, CLONE_PARAMS* param)

       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()



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       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)

GV Functions




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       is_gv_magical
               Returns "TRUE" if given the name of a magical GV.

               Currently only useful internally when determining
               if a GV should be created even in rvalue contexts.

               "flags" is not used at present but available for
               future extension to allow selecting particular
               classes of magical variable.

               Currently assumes that "name" is NUL terminated
               (as well as len being valid).  This assumption is
               met by all callers within the perl core, which all
               pass pointers returned by SvPV.

                       bool    is_gv_magical(const char *name, STRLEN len, U32 flags)

       is_gv_magical_sv
               Returns "TRUE" if given the name of a magical GV.
               Calls is_gv_magical.

                       bool    is_gv_magical_sv(SV *name, U32 flags)

Hash Manipulation Functions
       refcounted_he_chain_2hv
               Generates and returns a "HV *" by walking up the
               tree starting at the passed in "struct
               refcounted_he *".

                       HV *    refcounted_he_chain_2hv(const struct refcounted_he *c)

       refcounted_he_free
               Decrements the reference count of the passed in
               "struct refcounted_he *" by one. If the reference
               count reaches zero the structure's memory is
               freed, and "refcounted_he_free" iterates onto the
               parent node.

                       void    refcounted_he_free(struct refcounted_he *he)

       refcounted_he_new
               Creates a new "struct refcounted_he". As key is
               copied, and value is stored in a compact form, all
               references remain the property of the caller.  The
               "struct refcounted_he" is returned with a
               reference count of 1.

                       struct refcounted_he *  refcounted_he_new(struct refcounted_he *const parent, SV *const key, SV *const value)

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"



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               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.

                       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_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).

                       void    mg_localize(SV* sv, SV* nsv)

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)





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Pad Data Structures
       CvPADLIST
               CV's can have CvPADLIST(cv) set to point to an AV.

               For these purposes "forms" are a kind-of CV,
               eval""s are too (except they're not callable at
               will and are always thrown away after the eval""
               is done executing). Require'd files are simply
               evals without any outer lexical scope.

               XSUBs don't have CvPADLIST set - dXSTARG fetches
               values from PL_curpad, but that is really the
               callers pad (a slot of which is allocated by every
               entersub).

               The CvPADLIST AV has does not have AvREAL set, so
               REFCNT of component items is managed "manual"
               (mostly in pad.c) rather than normal av.c rules.
               The items in the AV are not SVs as for a normal
               AV, but other AVs:

               0'th Entry of the CvPADLIST is an AV which
               represents the "names" or rather the "static type
               information" for lexicals.

               The CvDEPTH'th entry of CvPADLIST AV is an AV
               which is the stack frame at that depth of
               recursion into the CV.  The 0'th slot of a frame
               AV is an AV which is @_.  other entries are
               storage for variables and op targets.

               During compilation: "PL_comppad_name" is set to
               the names AV.  "PL_comppad" is set to the frame AV
               for the frame CvDEPTH == 1.  "PL_curpad" is set to
               the body of the frame AV (i.e.
               AvARRAY(PL_comppad)).

               During execution, "PL_comppad" and "PL_curpad"
               refer to the live frame of the currently executing
               sub.

               Iterating over the names AV iterates over all
               possible pad items. Pad slots that are SVs_PADTMP
               (targets/GVs/constants) end up having &PL_sv_undef
               "names" (see pad_alloc()).

               Only my/our variable (SVs_PADMY/SVs_PADOUR) slots
               get valid names.  The rest are op
               targets/GVs/constants which are statically
               allocated or resolved at compile time.  These
               don't have names by which they can be looked up
               from Perl code at run time through eval"" like
               my/our variables can be.  Since they can't be
               looked up by "name" but only by their index



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               allocated at compile time (which is usually in
               PL_op->op_targ), wasting a name SV for them
               doesn't make sense.

               The SVs in the names AV have their PV being the
               name of the variable.  xlow+1..xhigh inclusive in
               the NV union is a range of cop_seq numbers for
               which the name is valid.  For typed lexicals name
               SV is SVt_PVMG and SvSTASH points at the type.
               For "our" lexicals, the type is also SVt_PVMG,
               with the SvOURSTASH slot pointing at the stash of
               the associated global (so that duplicate "our"
               declarations in the same package can be detected).
               SvUVX is sometimes hijacked to store the
               generation number during compilation.

               If SvFAKE is set on the name SV, then that slot in
               the frame AV is a REFCNT'ed reference to a lexical
               from "outside". In this case, the name SV does not
               use xlow and xhigh to store a cop_seq range, since
               it is in scope throughout. Instead xhigh stores
               some flags containing info about the real lexical
               (is it declared in an anon, and is it capable of
               being instantiated multiple times?), and for fake
               ANONs, xlow contains the index within the parent's
               pad where the lexical's value is stored, to make
               cloning quicker.

               If the 'name' is '&' the corresponding entry in
               frame AV is a CV representing a possible closure.
               (SvFAKE and name of '&' is not a meaningful
               combination currently but could become so if "my
               sub foo {}" is implemented.)

               Note that formats are treated as anon subs, and
               are cloned each time write is called (if
               necessary).

               The flag SVf_PADSTALE is cleared on lexicals each
               time the my() is executed, and set on scope exit.
               This allows the 'Variable $x is not available'
               warning to be generated in evals, such as

                   { my $x = 1; sub f { eval '$x'} } f();

               For state vars, SVf_PADSTALE is overloaded to mean
               'not yet initialised'

                       AV *    CvPADLIST(CV *cv)

       cv_clone
               Clone a CV: make a new CV which points to the same
               code etc, but which has a newly-created pad built
               by copying the prototype pad and capturing any



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               outer lexicals.

                       CV*     cv_clone(CV* proto)

       cv_dump dump the contents of a CV

                       void    cv_dump(const 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()

       pad_add_anon
               Add an anon code entry to the current compiling
               pad

                       PADOFFSET       pad_add_anon(SV* sv, OPCODE op_type)

       pad_add_name
               Create a new name and associated PADMY SV in the
               current pad; return the offset.  If "typestash" is
               valid, the name is for a typed lexical; set the
               name's stash to that value.  If "ourstash" is
               valid, it's an our lexical, set the name's
               SvOURSTASH to that value

               If fake, it means we're cloning an existing entry

                       PADOFFSET       pad_add_name(const char *name, HV* typestash, HV* ourstash, bool clone, bool state)

       pad_alloc
               Allocate a new my or tmp pad entry. For a my,
               simply push a null SV onto the end of PL_comppad,
               but for a tmp, scan the pad from PL_padix upwards
               for a slot which has no name and no active value.

                       PADOFFSET       pad_alloc(I32 optype, U32 tmptype)

       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;



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                    * an our (anywhere in the pad) with the same
               name and the same stash
                      as "ourstash" "is_our" indicates that the
               name to check is an 'our' declaration

                       void    pad_check_dup(const char* name, bool is_our, 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 *name, const CV* cv, U32 seq, int warn, SV** out_capture, SV** out_name_sv, int *out_flags)

       pad_findmy
               Given a lexical name, try to find its offset,
               first in the current pad, or failing that, in the
               pads of any lexically enclosing subs (including
               the complications introduced by eval). If the name
               is found in an outer pad, then a fake entry is
               added to the current pad.  Returns the offset in
               the current pad, or NOT_IN_PAD on failure.

                       PADOFFSET       pad_findmy(const char* name)

       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.



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                       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_new Create a new compiling padlist, saving and
               updating the various global vars at the same time
               as creating the pad itself. The following flags
               can be OR'ed together:

                   padnew_CLONE        this pad is for a cloned CV
                   padnew_SAVE         save old globals
                   padnew_SAVESUB      also save extra stuff for start of sub

                       PADLIST*        pad_new(int flags)

       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_setsv
               Set the entry at offset po in the current pad to
               sv.  Use the macro PAD_SETSV() rather than calling
               this function directly.

                       void    pad_setsv(PADOFFSET po, SV* sv)

       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)

       pad_tidy
               Tidy up a pad after we've finished compiling it:
                   * remove most stuff from the pads of anonsub
               prototypes;
                   * give it a @_;
                   * mark tmps as such.

                       void    pad_tidy(padtidy_type type)



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       pad_undef
               Free the padlist associated with a CV.  If parts
               of it happen to be current, we null the relevant
               PL_*pad* global vars so that we don't have any
               dangling references left.  We also repoint the
               CvOUTSIDE of any about-to-be-orphaned inner subs
               to the outer of this cv.

               (This function should really be called pad_free,
               but the name was already taken)

                       void    pad_undef(CV* cv)

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





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       PL_ofs_sv
               The output field separator - $, in Perl space.

                       SV*     PL_ofs_sv

       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* ptr, U32 size, 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.



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                       SV*     sv_2num(SV* sv)

Unicode Support
       find_uninit_var
               Find the name of the undefined variable (if any)
               that caused the operator o to issue a "Use of
               uninitialized value" warning.  If match is true,
               only return a name if it's 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.

                       SV*     find_uninit_var(OP* obase, SV* uninit_sv, bool top)

       report_uninit
               Print appropriate "Use of uninitialized variable"
               warning

                       void    report_uninit(SV* uninit_sv)

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(1), perlapi(1)



















perl v5.10.1                2010-03-17                         14


