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Purpose

Provide a list of deprecated and experimental items in parrot. All items in this list should have a corresponding Trac ticket[1].

Experimental Status

These features are not considered supported, even though they may have shipped in a supported release of parrot[2]. Use them at your own risk, as they can be removed or changed in any release. These items are marked below with [experimental].

Deprecated Status

Please see docs/project/support_policy.pod for the parrot project's policy regarding deprecated features.

Each item shows the first release in which it is eligible for removal, e.g. [eligible in 1.5]. If the release listed is one that has already shipped, this feature may be removed in any upcoming release, and you should no longer rely on it.

If you find a feature you once used was removed after a deprecation cycle, https://trac.parrot.org/parrot/wiki/Deprecation. Otherwise please open a documentation ticket via Trac[1].

Are you using any Deprecated Features?

When running parrot, you can receive warnings about deprecations. Either run parrot with the -w option to enable all warnings, or deprecations specifically by including this snippet:

PMCS

GzipHandle [experimental]

https://trac.parrot.org/parrot/ticket/1580

PackfileDebug [experimental]

https://trac.parrot.org/parrot/ticket/1599

CodeString [eligible in 2.7]

http://trac.parrot.org/parrot/ticket/1633

multiple dispatch within core PMCs [eligible in 1.1]

https://trac.parrot.org/parrot/ticket/452

Overriding vtable invoke in PIR objects [experimental]

The VTABLE invoke in object.pmc puts SELF at the start of the signature call arguments when there is no current object and is not already here. This allows the usage of $P0() instead of $P0($P0).

https://trac.parrot.org/parrot/ticket/103

UnManagedStruct handling nested structure [eligible in 2.4]

UnManagedStruct will be simplified to only support flat structures. This means that elements which themselves have structure - struct pointers and function pointers will be stored as void * and void (*)(void) respectively. To use these, they will need to be cast to the appropriate signature on access.

https://trac.parrot.org/parrot/ticket/1551

UnManagedStruct initializer structure [eligible in 2.4]

The initializer structure will cease to be an array of triples. Instead, an array of flags (no counts or offsets), or a string representation of the same information may be used.

https://trac.parrot.org/parrot/ticket/1552

UnManagedStruct get_integer, set_integer_native [eligible in 2.4]

These will no longer refer to the byte length of the buffer, but to the number of times the struct is repeated; emulating an array of structs.

https://trac.parrot.org/parrot/ticket/1553

ManagedStruct reallocations based on shape changes [eligible in 2.4]

Since shape changes may simply be used for re-interpreting data, and may also occur in several steps, re-allocating after any one shape change may be undesirable. In stead, an explicit allocate/reallocate method will be provided.

https://trac.parrot.org/parrot/ticket/1554

Auto-vivification of nested aggregates [eligible in 2.4]

E.g.

  $P0 = new ['Hash']
  $S1 = $P0['foo';'bar';'baz']

will not auto-vivify nested hashes and return PMCNULL early.

https://trac.parrot.org/parrot/ticket/1561

Method unescape on String [experimental]

This is a helper method for testing of Parrot_str_unescape_string.

https://trac.parrot.org/parrot/ticket/1628

logical_* vtables [eligiblie in 2.7]

These can be replaced by get_bool and intval ops unless you're using them for things that aren't really logical ops (don't do that!).

Logical vtables are removed in r49012, and logical ops on PMCs are converted to use get_bool internally. Rakudo seems to depend on logical ops on PMCs.

https://trac.parrot.org/parrot/ticket/1655

Method getpid on ParrotInterpreter [experimental]

Used to test the experimental function Parrot_getpid

https://trac.parrot.org/parrot/ticket/1564

Opcodes

charset, charsetname, find_charset, trans_charset [eligible in 2.10]

https://trac.parrot.org/parrot/ticket/1778

These opcodes will be removed. The corresponding encoding opcodes should be used instead.

fixed_8 encoding [eligible in 2.10]

https://trac.parrot.org/parrot/ticket/1778

The 'fixed_8' encoding is going away. Use 'ascii' instead. If you want to test for a fixed_8 encoding, you have to compare the encoding to 'ascii', 'iso-8859-1' and 'binary' separately.

open and close opcodes will be removed [eligible in 2.7]

https://trac.parrot.org/parrot/ticket/1697

These opcodes will be removed. The open/close methods on File or the FileHandle PMC should be used instead.

get_addr and set_addr [eligible in 1.5]

https://trac.parrot.org/parrot/ticket/218

These opcodes are being repurposed. They will always return a unique memory address of the PMC. Uses of get_addr and set_addr that would set label values for Sub, Exception, and related PMC types will instead be handled by get_label and set_label.

get_results opcode order and features [eligible in 2.1]

get_results no longer used to fetch exception object.

https://trac.parrot.org/parrot/ticket/1406

GC_SYS_NAME option to interpinfo_s_i [experimental]

Ability to get the string name of the current GC core from the interpinfo_s_i. See r43900 and r43904 for details.

https://trac.parrot.org/parrot/ticket/1581

NCI_FB_CB and NCI_FB_UD in iglobals [experimental]

Hooks allowing a runtime-loadable dynamic frame builder.

https://trac.parrot.org/parrot/ticket/1582

loadlib_p_s_p [experimental]

Ability to use non-default dynamic loading behaviour.

https://trac.parrot.org/parrot/ticket/1583

new_callback_p_p_p_s [eligible in 2.4]

To be replaced with new_callback_p_p_p_p_s.

https://trac.parrot.org/parrot/ticket/1548

dlfunc and new_callback signature string format [eligible in 2.4]

These will be changed to allow more flexibility in types.

https://trac.parrot.org/parrot/ticket/1565

find_lex [eligible in 2.4]

find_lex will not throw exception for non-existing lexicals.

https://trac.parrot.org/parrot/ticket/1207

inplace string updates. [eligible in 2.4]

All "inplace" string update ops are deprecated. E.g. "chopn_s", etc. Part of COW removal.

https://trac.parrot.org/parrot/ticket/1540

find_codepoint [experimental]

Intended to replace the CodeString charname_to_ord method.

https://trac.parrot.org/parrot/ticket/1629

All opcodes that modify non-argument registers. [eligible in 2.7]

E.g. "cleari", etc.

https://trac.parrot.org/parrot/ticket/1642

exchange [eligible in 2.7]

This op is too low level for Parrot in its current form.

https://trac.parrot.org/parrot/ticket/1643

finalize [experimental]

Finalize exception handler, unrolling inner runloops if needed.

https://trac.parrot.org/parrot/ticket/1635

logical PMC ops [eligible in 2.7]

These fall out from the logical vtables deprecation.

https://trac.parrot.org/parrot/ticket/1655

errorson, errorsoff operations [eligible in 2.10]

The .PARROT_ERRORS_GLOBAL_FLAG flag will be eliminated. It is not used by Parrot.

Bytecode

packfile structure [experimental]

https://trac.parrot.org/parrot/ticket/451

opcode numbering [experimental]

https://trac.parrot.org/parrot/ticket/451

PMC numbering [experimental]

https://trac.parrot.org/parrot/ticket/451

Debugger

Assigning to registers [experimental]

PIR syntax

Assignment syntax with opcodes [eligible in 1.1]

https://trac.parrot.org/parrot/ticket/906

continuation-based ExceptionHandlers [eligible in 2.1]

https://trac.parrot.org/parrot/ticket/1091

implicit optional named parameters [eligible in 2.1]

https://trac.parrot.org/parrot/ticket/1103

:unique_reg flag [eligible in 2.7]

https://trac.parrot.org/parrot/ticket/1622

.nci_call [eligible in 2.7]

As of the latest PCC changes, there is nothing special about calling an NCI sub.

https://trac.parrot.org/parrot/ticket/1623

.meth_call [eligible in 2.7]

As of the latest PCC changes, this does nothing different from '.call'.

https://trac.parrot.org/parrot/ticket/1624

:main Sub behaviour and selection. [eligible in 2.7]

Currently, if no :main sub is found, the first .sub in a file is used as main. Also, arguments are passed to the main sub regardless of the .param declarations in that sub.

After this change, if no sub is marked with :main, an exception will be raised. Multiple :main declarations will be still be allowed, and all but the first will be ignored.

This change will also force all subs, including :main, to have their arguments checked - to allow an arbitrary number of arguments, have this be the only .param declaration in the sub.

 .param pmc args :slurpy

https://trac.parrot.org/parrot/ticket/1033 https://trac.parrot.org/parrot/ticket/1704 https://trac.parrot.org/parrot/ticket/1705

Functions

mmd_cvt_to_types [eligible in 1.1]

https://trac.parrot.org/parrot/ticket/907

C API coding standards cleanup [eligible in 1.1]

All C API functions that aren't currently named according to the 'Parrot_<system>_*' scheme will be renamed. A list of renamed functions will be kept in the ticket at:

https://trac.parrot.org/parrot/ticket/443

PMC Attributes Allocation Functions [experimental]
 Parrot_gc_allocate_pmc_attributes
 Parrot_gc_free_pmc_attributes

These items and related helper functions are added as experimental support for https://trac.parrot.org/parrot/ticket/1506

STRING Out parameters in Parrot_str_* functions [eligible in 2.1]

All STRING modification functions will return a STRING pointer; capture and use this rather than relying on in-place modification of an existing pointer.

https://trac.parrot.org/parrot/ticket/1584

STRING COW [eligible in 2.4]

COW strings are to be removed. All "inplace" string modification functions and all "inplace" string ops are deprecated.

https://trac.parrot.org/parrot/ticket/1540

Parrot_str_unescape_string [experimental]

This function is an experimental addition to enhance and maybe replace Parrot_str_unescape

https://trac.parrot.org/parrot/ticket/1628

Parrot_getpid [experimental]

Get process id, experimental.

https://trac.parrot.org/parrot/ticket/1564

Parrot_load_bytecode_file [experimental]

Load a .pbc file into the interpreter. Experimental.

Compiler tools

Parrot Grammar Engine (PGE)

Action methods in rules

Per Synopsis 5, all regexes will have an implied {*} token at the end which cause invocation of an action method if a :action object is supplied.

https://trac.parrot.org/parrot/ticket/843

Parrot Compiler Toolkit

PCT::HLLCompiler stages [eligible in 1.1]

The interface of various methods for adding, removing, and modifying the list stages in a PCT::HLLCompiler object is subject to change. The existing actual stages will remain; only the mechanism for specifying the order of individual stages is likely to change.

https://trac.parrot.org/parrot/ticket/462

PCT::HLLCompiler from Perl 5's Test::Harness [eligible in 1.1]

In order to facilitate using PCT::HLLCompiler with test harnesses, the command_line method of PCT::HLLCompiler object exits silently if it detects that it is being run in a sample run from Perl's Test::Harness. Currently this detection is done by checking the second command line argument for "@INC"; future releases may use a different detection mechanism or eliminate it altogether.

https://trac.parrot.org/parrot/ticket/463

PAST::Val node generation [eligible in 1.5]

The PAST::Compiler may generate the code for PAST::Val nodes (i.e., constants) at the beginning of the block (Parrot sub) instead of the location where they occur in the PAST tree.

https://trac.parrot.org/parrot/ticket/868

Meta-model implementation used by PCT [eligible in 2.7]

PCT is set to switch to a new meta-model implementation for its classes and objects. This will most likely only affect those who rely on the interface of what is returned from .HOW, or rely on PCT objects exhibiting various other peculiarities of the P6object implementation. (Even when that is the case, the HOW API will not be changing too drastically, so for most PCT users there should be little to no upheavel.)

Parrot library

PARROT_LIBRARY and PARROT_INCLUDE environment variables [experimental]

https://trac.parrot.org/parrot/ticket/1429

A way to provide an equivalent of -L and -I parrot command line options to language that doesn't support it.

Protoobject [eligible in 2.7]

Use P6Object instead.

http://trac.parrot.org/parrot/ticket/1337

Archive::Tar & Archive::Zip [experimental]

https://trac.parrot.org/parrot/ticket/1598

LWP, HTTP::Message, URI & URI::Escape [experimental]

http://trac.parrot.org/parrot/ticket/1637

JSON and Config;JSON [eligible in 1.5]

https://trac.parrot.org/parrot/ticket/508

Cross-HLL library loading [experimental]

https://trac.parrot.org/parrot/ticket/754

OpenGL bindings and libraries [experimental]

https://trac.parrot.org/parrot/ticket/852

Experimental

Threads and Parallelism [experimental]

https://trac.parrot.org/parrot/ticket/1601

Footnotes

  1. Trac is parrot's primary issue tracking system.
  2. For an item to be considered experimental, it can never have shipped in a supported release without the [experimental] tag; otherwise, it must be deprecated normally before removal or incompatible change.
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