concise

B::Concise is a Perl syntax tree, printing concise info about ops.

SYNOPSIS

perl -MO=Concise[,OPTIONS] foo.pl

use B::Concise qw(set_style add_callback);

This compiler backend prints the internal OPs of a Perl programs syntax tree in one of several space-efficient text formats suitable for debugging the inner workings of perl or other compiler backends. It can print OPs in the order they appear in the OP tree, in the order they will execute, or in a text approximation to their tree structure, and the format of the information displayed is customizable. Its function is similar to that of perls -Dx debugging flag or the B::Terse module, but it is more sophisticated and flexible.

EXAMPLE

Heres an example of 2 outputs (aka renderings), using the -exec and -basic (i.e. default) formatting conventions on the same code snippet.

% perl -MO=Concise,-exec -e $a = $b + 42
1 <0> enter
2 <;> nextstate(main 1 -e:1) v
3 <#> gvsv[*b] s
4 <$> const[IV 42] s
* 5 <2> add[t3] sK/2
6 <#> gvsv[*a] s
7 <2> sassign vKS/2
8 <@> leave[1 ref] vKP/REFC

Each line corresponds to an opcode. The opcode marked with * is used in a few examples below.

The 1st column is the ops sequence number, starting at 1, and is displayed in base 36 by default. This rendering is in -exec (i.e. execution) order.

The symbol between angle brackets indicates the ops type, for example; < 2 > is a BINOP, < @ > a LISTOP, and < # > is a PADOP, which is used in threaded perls. (see "OP class abbreviations").

The opname, as in add[t1], which may be followed by op-specific information in parentheses or brackets (ex [t1]).

The op-flags (ex sK/2) follow, and are described in ("OP flags abbreviations").

% perl -MO=Concise -e $a = $b + 42
8 <@> leave[1 ref] vKP/REFC ->(end)
1 <0> enter ->2
2 <;> nextstate(main 1 -e:1) v ->3
7 <2> sassign vKS/2 ->8
* 5 <2> add[t1] sK/2 ->6
- <1> ex-rv2sv sK/1 ->4
3 <$> gvsv(*b) s ->4
4 <$> const(IV 42) s ->5
- <1> ex-rv2sv sKRM*/1 ->7
6 <$> gvsv(*a) s ->7

The default rendering is top-down, so theyre not in execution order. This form reflects the way the stack is used to parse and evaluate expressions; the add operates on the two terms below it in the tree.

Nullops appear as ex-opname, where opname is an op that has been optimized away by perl. Theyre displayed with a sequence-number of -, because they are not executed (they dont appear in previous example), theyre printed here because they reflect the parse.

The arrow points to the sequence number of the next op; theyre not displayed in -exec mode, for obvious reasons.

Note that because this rendering was done on a non-threaded perl, the PADOPs in the previous examples are now SVOPs, and some (but not all) of the square brackets have been replaced by round ones. This is a subtle feature to provide some visual distinction between renderings on threaded and un-threaded perls.

The Dictionary of Concise Writing is an ebook where the Robert H. Fiske analyzes the excessive wordiness in common usage and draws up an alphabetical compendium of wordy phrases and more concise alternatives. Some of the examples are noteworthy, and serious writers and editors may find useful replacements for windy phrases. New contents, better navigation, larger screen, print, quick index, 1 year subscription to The Vocabula Review online.

Concise System Info presents useful system performance information in a compact view. Time and date are also displayed.

The background colors are from the Google Analog and Digital clock gadgets, allowing this gadget to blend in nicely with those.

Click the button in the lower right corner to change the Gadgets color.

A Palm PDA dictionary program, featuring the eleventh edition of the Concise Oxford English Dictionary. It is the most popular dictionary of its kind around the world and is noted for its clear, concise definitions as well as its comprehensive and authoritative coverage of the vocabulary of the English-speaking world. Authoritative and up to date, this eleventh edition of the Concise Oxford English Dictionary contains over 240,000 words, phrases, and definitions, including over 1700 new words. It offers rich vocabulary coverage, with full treatment of World English, rare, historical, and archaic terms, as well as scientific and technical vocabulary, and provides hundreds of helpful notes on grammar and usage. New to this edition and beyond the standard etymological information, the dictionary provides a fascinating Word Histories feature, exploring word origins, links and meaning changes for a number of interesting cases.


Dictionary Features:
- Over 240,000 words, phrases, and definitions
- 1700 new words
- 400 new notes on grammar and usage
- Completely up to date with hundreds of new words
- Language level - Intermediate
- Word Histories feature, providing detailed explanations of word origins and development
- Full appendices on topics such as alphabets, currencies, electronic English, and the registers of language, from formal to slang
- Guide to Good English with advice on grammar, punctuation, and spelling
- Goes with DEPReader dictionary software program - a powerful dictionary reader providing instant lookup both from the lookup field and from the dictionary definitions; special COED cross-references denoted by small capital letters; various searches (phonetic, error tolerance, crossword search), maximal data accessibility.

The Concise Oxford English Dictionary is the most popular dictionary of its kind around the world and is noted for its clear, concise definitions as well as its comprehensive and authoritative coverage of the vocabulary of the English-speaking world. This reissue of the revised edition brings the tenth edition completely up to date by the
addition of hundreds of new words and meanings taken from Oxfords renowned data collection program, with a special focus on fast-changing areas of the language such as new technology, e-commerce, fashion, and youth culture.
The clearest , most accurate definitions, based on the largest language research programme in the world
Clear layout with each new section (phrases, derivatives, usage notes, etymologies, wordbuilder) on new line
Usage notes, offering help with tricky and controversial questions
In-text lists and tables focusing on core study subjects
Pronunciations for words that might cause difficulty
Origin Section tracing the history of words
The Oxford Concise English Dictionary is utilized by MSDict Viewer - an innovative dictionary reader specially designed to combine high data compression for memory restricted devices with a fast search algorithm, and user-friendly interface with amazing speed.
Quick dynamic search of words while you type
Transcriptions facilitating pronunciation
Stylish user interface with several split screen modes
Hyperlinks between different related words
Dynamic changing of font sizes
Opportunity to add custom notes to any article in the dictionary so you can save your ideas and examples of usage
Button allowing quick erase of the query field

A Palm PDA dictionary program, featuring the eleventh edition of the Concise Oxford English Dictionary. It is the most popular dictionary of its kind around the world and is noted for its clear, concise definitions as well as its comprehensive and authoritative coverage of the vocabulary of the English-speaking world. Authoritative and up to date, this eleventh edition of the Concise Oxford English Dictionary contains over 240,000 words, phrases, and definitions, including over 900 new words. It offers rich vocabulary coverage, with full treatment of World English, rare, historical, and archaic terms, as well as scientific and technical vocabulary, and provides hundreds of helpful notes on grammar and usage. New to this edition and beyond the standard etymological information, the dictionary provides a fascinating Word Histories feature, exploring word origins, links and meaning changes for a number of interesting cases.


Dictionary Features: Over 240,000 words, phrases, and definitions
900 new words
400 new notes on grammar and usage
Completely up to date with hundreds of new words
Language level - Intermediate
Word Histories feature, providing detailed explanations of word origins and development
Full appendices on topics such as alphabets, currencies, electronic English, and the registers of language, from formal to slang
Guide to Good English with advice on grammar, punctuation, and spelling
Goes with DEPReader dictionary software program - a powerful dictionary reader providing instant lookup both from the lookup field and from the dictionary definitions; special COED cross-references denoted by small capital letters; various searches (phonetic, error tolerance, crossword search), maximal data accessibility.