+-*- buffer-read-only: t -*-
+
+!!!!!!! DO NOT EDIT THIS FILE !!!!!!!
+This file is built by autodoc.pl extracting documentation from the C source
+files.
+
=head1 NAME
perlintern - autogenerated documentation of purely B<internal>
Perl functions
=head1 DESCRIPTION
+X<internal Perl functions> X<interpreter functions>
This file is the autogenerated documentation of functions in the
Perl interpreter that are documented using Perl's internal documentation
B<they are not for use in extensions>!
+=head1 CV reference counts and CvOUTSIDE
+
+=over 8
+
+=item CvWEAKOUTSIDE
+X<CvWEAKOUTSIDE>
+
+Each CV has a pointer, C<CvOUTSIDE()>, to its lexically enclosing
+CV (if any). Because pointers to anonymous sub prototypes are
+stored in C<&> 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 C<CvOUTSIDE> in the I<one specific instance> that the parent
+has a C<&> pad slot pointing back to us. In this case, we set the
+C<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
+C<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 $a is
+executed, the C<eval '$x'> causes the chain of C<CvOUTSIDE>s to be followed,
+and the freed BEGIN is accessed.
+
+To avoid this, whenever a CV and its associated pad is freed, any
+C<&> 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 C<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 C<$a> above).
+
+One other thing to consider is that a CV may be merely undefined
+rather than freed, eg C<undef &foo>. In this case, its refcount may
+not have reached zero, but we still delete its pad and its C<CvROOT> etc.
+Since various children may still have their C<CvOUTSIDE> pointing at this
+undefined CV, we keep its own C<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)
+
+=for hackers
+Found in file cv.h
+
+
+=back
+
=head1 Functions in file pad.h
=over 8
=item CX_CURPAD_SAVE
+X<CX_CURPAD_SAVE>
Save the current pad in the given context block structure.
Found in file pad.h
=item CX_CURPAD_SV
+X<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).
=for hackers
Found in file pad.h
-=item PAD_BASE_SV
+=item PAD_BASE_SV
+X<PAD_BASE_SV>
Get the value from slot C<po> in the base (DEPTH=1) pad of a padlist
- SV * PAD_BASE_SV (PADLIST padlist, PADOFFSET po)
+ SV * PAD_BASE_SV(PADLIST padlist, PADOFFSET po)
=for hackers
Found in file pad.h
=item PAD_CLONE_VARS
+X<PAD_CLONE_VARS>
-|CLONE_PARAMS* param
Clone the state variables associated with running and compiling pads.
- void PAD_CLONE_VARS(PerlInterpreter *proto_perl \)
+ void PAD_CLONE_VARS(PerlInterpreter *proto_perl, CLONE_PARAMS* param)
=for hackers
Found in file pad.h
=item PAD_COMPNAME_FLAGS
+X<PAD_COMPNAME_FLAGS>
Return the flags for the current compiling pad name
at offset C<po>. Assumes a valid slot entry.
Found in file pad.h
=item PAD_COMPNAME_GEN
+X<PAD_COMPNAME_GEN>
The generation number of the name at offset C<po> in the current
-compiling pad (lvalue). Note that C<SvCUR> is hijacked for this purpose.
+compiling pad (lvalue). Note that C<SvUVX> is hijacked for this purpose.
STRLEN PAD_COMPNAME_GEN(PADOFFSET po)
=for hackers
Found in file pad.h
+=item PAD_COMPNAME_GEN_set
+X<PAD_COMPNAME_GEN_set>
+
+Sets the generation number of the name at offset C<po> in the current
+ling pad (lvalue) to C<gen>. Note that C<SvUV_set> is hijacked for this purpose.
+
+ STRLEN PAD_COMPNAME_GEN_set(PADOFFSET po, int gen)
+
+=for hackers
+Found in file pad.h
+
=item PAD_COMPNAME_OURSTASH
+X<PAD_COMPNAME_OURSTASH>
Return the stash associated with an C<our> variable.
Assumes the slot entry is a valid C<our> lexical.
Found in file pad.h
=item PAD_COMPNAME_PV
+X<PAD_COMPNAME_PV>
Return the name of the current compiling pad name
at offset C<po>. Assumes a valid slot entry.
Found in file pad.h
=item PAD_COMPNAME_TYPE
+X<PAD_COMPNAME_TYPE>
Return the type (stash) of the current compiling pad name at offset
C<po>. Must be a valid name. Returns null if not typed.
Found in file pad.h
=item PAD_DUP
+X<PAD_DUP>
Clone a padlist.
Found in file pad.h
=item PAD_RESTORE_LOCAL
+X<PAD_RESTORE_LOCAL>
Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL()
Found in file pad.h
=item PAD_SAVE_LOCAL
+X<PAD_SAVE_LOCAL>
Save the current pad to the local variable opad, then make the
current pad equal to npad
Found in file pad.h
=item PAD_SAVE_SETNULLPAD
+X<PAD_SAVE_SETNULLPAD>
Save the current pad then set it to null.
=for hackers
Found in file pad.h
-=item PAD_SETSV
+=item PAD_SETSV
+X<PAD_SETSV>
Set the slot at offset C<po> in the current pad to C<sv>
- SV * PAD_SETSV (PADOFFSET po, SV* sv)
+ SV * PAD_SETSV(PADOFFSET po, SV* sv)
=for hackers
Found in file pad.h
-=item PAD_SET_CUR
+=item PAD_SET_CUR
+X<PAD_SET_CUR>
Set the current pad to be pad C<n> in the padlist, saving
-the previous current pad.
+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)
+
+=for hackers
+Found in file pad.h
+
+=item PAD_SET_CUR_NOSAVE
+X<PAD_SET_CUR_NOSAVE>
- void PAD_SET_CUR (PADLIST padlist, I32 n)
+like PAD_SET_CUR, but without the save
+
+ void PAD_SET_CUR_NOSAVE(PADLIST padlist, I32 n)
=for hackers
Found in file pad.h
-=item PAD_SV
+=item PAD_SV
+X<PAD_SV>
Get the value at offset C<po> in the current pad
- void PAD_SV (PADOFFSET po)
+ void PAD_SV(PADOFFSET po)
=for hackers
Found in file pad.h
-=item PAD_SVl
+=item PAD_SVl
+X<PAD_SVl>
Lightweight and lvalue version of C<PAD_SV>.
Get or set the value at offset C<po> in the current pad.
Unlike C<PAD_SV>, does not print diagnostics with -DX.
For internal use only.
- SV * PAD_SVl (PADOFFSET po)
+ SV * PAD_SVl(PADOFFSET po)
=for hackers
Found in file pad.h
-=item SAVECLEARSV
+=item SAVECLEARSV
+X<SAVECLEARSV>
-Clear the pointed to pad value on scope exit. (ie the runtime action of 'my')
+Clear the pointed to pad value on scope exit. (i.e. the runtime action of 'my')
- void SAVECLEARSV (SV **svp)
+ void SAVECLEARSV(SV **svp)
=for hackers
Found in file pad.h
=item SAVECOMPPAD
+X<SAVECOMPPAD>
save PL_comppad and PL_curpad
=for hackers
Found in file pad.h
-=item SAVEPADSV
+=item SAVEPADSV
+X<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)
+ void SAVEPADSV(PADOFFSET po)
=for hackers
Found in file pad.h
=back
-=head1 Functions in file pp_ctl.c
-
+=head1 GV Functions
=over 8
-=item find_runcv
+=item is_gv_magical_sv
+X<is_gv_magical_sv>
+
+Returns C<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.
+
+C<flags> is not used at present but available for future extension to
+allow selecting particular classes of magical variable.
-Locate the CV corresponding to the currently executing sub or eval.
+Currently assumes that C<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.
- CV* find_runcv()
+ bool is_gv_magical_sv(SV *const name_sv, U32 flags)
=for hackers
-Found in file pp_ctl.c
+Found in file gv.c
=back
-=head1 Global Variables
+=head1 Hash Manipulation Functions
=over 8
-=item PL_DBsingle
+=item refcounted_he_chain_2hv
+X<refcounted_he_chain_2hv>
-When Perl is run in debugging mode, with the B<-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
-C<PL_DBsub>.
+Generates and returns a C<HV *> by walking up the tree starting at the passed
+in C<struct refcounted_he *>.
- SV * PL_DBsingle
+ HV * refcounted_he_chain_2hv(const struct refcounted_he *c)
=for hackers
-Found in file intrpvar.h
+Found in file hv.c
-=item PL_DBsub
+=item refcounted_he_free
+X<refcounted_he_free>
-When Perl is run in debugging mode, with the B<-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
-C<PL_DBsingle>.
+Decrements the reference count of the passed in C<struct refcounted_he *>
+by one. If the reference count reaches zero the structure's memory is freed,
+and C<refcounted_he_free> iterates onto the parent node.
- GV * PL_DBsub
+ void refcounted_he_free(struct refcounted_he *he)
=for hackers
-Found in file intrpvar.h
+Found in file hv.c
-=item PL_DBtrace
+=item refcounted_he_new
+X<refcounted_he_new>
-Trace variable used when Perl is run in debugging mode, with the B<-d>
-switch. This is the C variable which corresponds to Perl's $DB::trace
-variable. See C<PL_DBsingle>.
+Creates a new C<struct refcounted_he>. As S<key> is copied, and value is
+stored in a compact form, all references remain the property of the caller.
+The C<struct refcounted_he> is returned with a reference count of 1.
- SV * PL_DBtrace
+ struct refcounted_he * refcounted_he_new(struct refcounted_he *const parent, SV *const key, SV *const value)
=for hackers
-Found in file intrpvar.h
+Found in file hv.c
-=item PL_dowarn
-The C variable which corresponds to Perl's $^W warning variable.
+=back
- bool PL_dowarn
+=head1 IO Functions
+
+=over 8
+
+=item start_glob
+X<start_glob>
+
+Function called by C<do_readline> to spawn a glob (or do the glob inside
+perl on VMS). This code used to be inline, but now perl uses C<File::Glob>
+this glob starter is only used by miniperl during the build process.
+Moving it away shrinks pp_hot.c; shrinking pp_hot.c helps speed perl up.
+
+ PerlIO* start_glob(SV *tmpglob, IO *io)
=for hackers
-Found in file intrpvar.h
+Found in file doio.c
-=item PL_last_in_gv
-The GV which was last used for a filehandle input operation. (C<< <FH> >>)
+=back
- GV* PL_last_in_gv
+=head1 Magical Functions
+
+=over 8
+
+=item magic_clearhint
+X<magic_clearhint>
+
+Triggered by a delete from %^H, records the key to
+C<PL_compiling.cop_hints_hash>.
+
+ int magic_clearhint(SV* sv, MAGIC* mg)
=for hackers
-Found in file thrdvar.h
+Found in file mg.c
-=item PL_ofs_sv
+=item magic_sethint
+X<magic_sethint>
-The output field separator - C<$,> in Perl space.
+Triggered by a store to %^H, records the key/value pair to
+C<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.
- SV* PL_ofs_sv
+ int magic_sethint(SV* sv, MAGIC* mg)
=for hackers
-Found in file thrdvar.h
+Found in file mg.c
-=item PL_rs
+=item mg_localize
+X<mg_localize>
-The input record separator - C<$/> in Perl space.
+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).
- SV* PL_rs
+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)
=for hackers
-Found in file thrdvar.h
+Found in file mg.c
=back
-=head1 GV Functions
+=head1 MRO Functions
=over 8
-=item is_gv_magical
-
-Returns C<TRUE> if given the name of a magical GV.
+=item mro_get_linear_isa_c3
+X<mro_get_linear_isa_c3>
-Currently only useful internally when determining if a GV should be
-created even in rvalue contexts.
+Returns the C3 linearization of @ISA
+the given stash. The return value is a read-only AV*.
+C<level> should be 0 (it is used internally in this
+function's recursion).
-C<flags> is not used at present but available for future extension to
-allow selecting particular classes of magical variable.
+You are responsible for C<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).
- bool is_gv_magical(char *name, STRLEN len, U32 flags)
+ AV* mro_get_linear_isa_c3(HV* stash, I32 level)
=for hackers
-Found in file gv.c
+Found in file mro.c
+=item mro_get_linear_isa_dfs
+X<mro_get_linear_isa_dfs>
-=back
+Returns the Depth-First Search linearization of @ISA
+the given stash. The return value is a read-only AV*.
+C<level> should be 0 (it is used internally in this
+function's recursion).
-=head1 IO Functions
+You are responsible for C<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).
-=over 8
+ AV* mro_get_linear_isa_dfs(HV* stash, I32 level)
-=item start_glob
+=for hackers
+Found in file mro.c
-Function called by C<do_readline> to spawn a glob (or do the glob inside
-perl on VMS). This code used to be inline, but now perl uses C<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.
+=item mro_isa_changed_in
+X<mro_isa_changed_in>
- PerlIO* start_glob(SV* pattern, IO *io)
+Takes the necessary steps (cache invalidations, mostly)
+when the @ISA of the given package has changed. Invoked
+by the C<setisa> magic, should not need to invoke directly.
+
+ void mro_isa_changed_in(HV* stash)
=for hackers
-Found in file doio.c
+Found in file mro.c
=back
=over 8
=item CvPADLIST
+X<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).
+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
other entries are storage for variables and op targets.
During compilation:
-C<PL_comppad_name> is set the the the names AV.
-C<PL_comppad> is set the the frame AV for the frame CvDEPTH == 1.
-C<PL_curpad> is set the body of the frame AV (i.e. AvARRAY(PL_comppad)).
+C<PL_comppad_name> is set to the names AV.
+C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1.
+C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)).
During execution, C<PL_comppad> and C<PL_curpad> refer to the live
frame of the currently executing sub.
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.
-NV+1..IV inclusive 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 C<our> lexicals, the type is SVt_PVGV, and GvSTASH points at the
-stash of the associated global (so that duplicate C<our> delarations in the
-same package can be detected). SvCUR is sometimes hijacked to
-store the generation number during compilation.
-
-If SvFAKE is set on the name SV then slot in the frame AVs are
-a REFCNT'ed references to a lexical from "outside". In this case,
-the name SV does not have a cop_seq range, since it is in scope
-throughout.
-
-If the 'name' is '&' the the corresponding entry in frame AV
+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 C<our> lexicals, the type is also SVt_PVMG, with the
+SvOURSTASH slot pointing at the stash of the associated global (so that
+duplicate C<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 C<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)
=for hackers
Found in file pad.c
=item cv_clone
+X<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
Found in file pad.c
=item cv_dump
+X<cv_dump>
dump the contents of a CV
- void cv_dump(CV *cv, char *title)
+ void cv_dump(const CV *cv, const char *title)
=for hackers
Found in file pad.c
=item do_dump_pad
+X<do_dump_pad>
Dump the contents of a padlist
Found in file pad.c
=item intro_my
+X<intro_my>
"Introduce" my variables to visible status.
Found in file pad.c
=item pad_add_anon
+X<pad_add_anon>
Add an anon code entry to the current compiling pad
Found in file pad.c
=item pad_add_name
+X<pad_add_name>
-Create a new name in the current pad at the specified offset.
+Create a new name and associated PADMY SV in the current pad; return the
+offset.
If C<typestash> is valid, the name is for a typed lexical; set the
name's stash to that value.
If C<ourstash> is valid, it's an our lexical, set the name's
-GvSTASH to that value
-
-Also, if the name is @.. or %.., create a new array or hash for that slot
+SvOURSTASH to that value
If fake, it means we're cloning an existing entry
- PADOFFSET pad_add_name(char *name, HV* typestash, HV* ourstash, bool clone)
+ PADOFFSET pad_add_name(const char *name, HV* typestash, HV* ourstash, bool clone, bool state)
=for hackers
Found in file pad.c
=item pad_alloc
+X<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 and no active value.
+for a slot which has no name and no active value.
PADOFFSET pad_alloc(I32 optype, U32 tmptype)
Found in file pad.c
=item pad_block_start
+X<pad_block_start>
Update the pad compilation state variables on entry to a new block
Found in file pad.c
=item pad_check_dup
+X<pad_check_dup>
Check for duplicate declarations: report any of:
* a my in the current scope with the same name;
as C<ourstash>
C<is_our> indicates that the name to check is an 'our' declaration
- void pad_check_dup(char* name, bool is_our, HV* ourstash)
+ void pad_check_dup(const char* name, bool is_our, const HV* ourstash)
=for hackers
Found in file pad.c
=item pad_findlex
+X<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. innercv is the CV *inside*
-the chain of outer CVs to be searched. If newoff is non-null, this is a
-run-time cloning: don't add fake entries, just find the lexical and add a
-ref to it at newoff in the current pad.
+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(char* name, PADOFFSET newoff, CV* innercv)
+ PADOFFSET pad_findlex(const char *name, const CV* cv, U32 seq, int warn, SV** out_capture, SV** out_name_sv, int *out_flags)
=for hackers
Found in file pad.c
=item pad_findmy
+X<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
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(char* name)
+ PADOFFSET pad_findmy(const char* name)
=for hackers
Found in file pad.c
=item pad_fixup_inner_anons
+X<pad_fixup_inner_anons>
For any anon CVs in the pad, change CvOUTSIDE of that CV from
-old_cv to new_cv if necessary.
+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)
Found in file pad.c
=item pad_free
+X<pad_free>
-Free the SV at offet po in the current pad.
+Free the SV at offset po in the current pad.
void pad_free(PADOFFSET po)
Found in file pad.c
=item pad_leavemy
+X<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.
Found in file pad.c
=item pad_new
+X<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
padnew_SAVE save old globals
padnew_SAVESUB also save extra stuff for start of sub
- PADLIST* pad_new(padnew_flags flags)
+ PADLIST* pad_new(int flags)
=for hackers
Found in file pad.c
=item pad_push
+X<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.
-If has_args is true, give the new pad an @_ in slot zero.
+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, int has_args)
+ void pad_push(PADLIST *padlist, int depth)
=for hackers
Found in file pad.c
=item pad_reset
+X<pad_reset>
Mark all the current temporaries for reuse
Found in file pad.c
=item pad_setsv
+X<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.
Found in file pad.c
=item pad_swipe
+X<pad_swipe>
Abandon the tmp in the current pad at offset po and replace with a
new one.
Found in file pad.c
=item pad_tidy
+X<pad_tidy>
Tidy up a pad after we've finished compiling it:
* remove most stuff from the pads of anonsub prototypes;
Found in file pad.c
=item pad_undef
+X<pad_undef>
Free the padlist associated with a CV.
If parts of it happen to be current, we null the relevant
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)
=for hackers
=back
+=head1 Per-Interpreter Variables
+
+=over 8
+
+=item PL_DBsingle
+X<PL_DBsingle>
+
+When Perl is run in debugging mode, with the B<-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
+C<PL_DBsub>.
+
+ SV * PL_DBsingle
+
+=for hackers
+Found in file intrpvar.h
+
+=item PL_DBsub
+X<PL_DBsub>
+
+When Perl is run in debugging mode, with the B<-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
+C<PL_DBsingle>.
+
+ GV * PL_DBsub
+
+=for hackers
+Found in file intrpvar.h
+
+=item PL_DBtrace
+X<PL_DBtrace>
+
+Trace variable used when Perl is run in debugging mode, with the B<-d>
+switch. This is the C variable which corresponds to Perl's $DB::trace
+variable. See C<PL_DBsingle>.
+
+ SV * PL_DBtrace
+
+=for hackers
+Found in file intrpvar.h
+
+=item PL_dowarn
+X<PL_dowarn>
+
+The C variable which corresponds to Perl's $^W warning variable.
+
+ bool PL_dowarn
+
+=for hackers
+Found in file intrpvar.h
+
+=item PL_last_in_gv
+X<PL_last_in_gv>
+
+The GV which was last used for a filehandle input operation. (C<< <FH> >>)
+
+ GV* PL_last_in_gv
+
+=for hackers
+Found in file intrpvar.h
+
+=item PL_ofsgv
+X<PL_ofsgv>
+
+The glob containing the output field separator - C<*,> in Perl space.
+
+ GV* PL_ofsgv
+
+=for hackers
+Found in file intrpvar.h
+
+=item PL_rs
+X<PL_rs>
+
+The input record separator - C<$/> in Perl space.
+
+ SV* PL_rs
+
+=for hackers
+Found in file intrpvar.h
+
+
+=back
+
=head1 Stack Manipulation Macros
=over 8
=item djSP
+X<djSP>
Declare Just C<SP>. This is actually identical to C<dSP>, and declares
a local copy of perl's stack pointer, available via the C<SP> macro.
Found in file pp.h
=item LVRET
+X<LVRET>
True if this op will be the return value of an lvalue subroutine
=over 8
-=item report_uninit
-
-Print appropriate "Use of uninitialized variable" warning
-
- void report_uninit()
-
-=for hackers
-Found in file sv.c
-
=item sv_add_arena
+X<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)
+ void sv_add_arena(char *const ptr, const U32 size, const U32 flags)
=for hackers
Found in file sv.c
=item sv_clean_all
+X<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
Found in file sv.c
=item sv_clean_objs
+X<sv_clean_objs>
Attempt to destroy all objects not yet freed
Found in file sv.c
=item sv_free_arenas
+X<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.
=back
+=head1 SV-Body Allocation
+
+=over 8
+
+=item sv_2num
+X<sv_2num>
+
+Return an SV with the numeric value of the source SV, doing any necessary
+reference or overload conversion. You must use the C<SvNUM(sv)> macro to
+access this function.
+
+ SV* sv_2num(SV *const sv)
+
+=for hackers
+Found in file sv.c
+
+
+=back
+
+=head1 Unicode Support
+
+=over 8
+
+=item find_uninit_var
+X<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(const OP *const obase, const SV *const uninit_sv, bool top)
+
+=for hackers
+Found in file sv.c
+
+=item report_uninit
+X<report_uninit>
+
+Print appropriate "Use of uninitialized variable" warning
+
+ void report_uninit(const SV *uninit_sv)
+
+=for hackers
+Found in file sv.c
+
+
+=back
+
=head1 AUTHORS
The autodocumentation system was originally added to the Perl core by
perlguts(1), perlapi(1)
+=cut
+
+ ex: set ro:
projects / p5sagit/p5-mst-13.2.git / blobdiff