Citizendia
Your Ad Here

Bytecode is a term which has been used to denote various forms of instruction sets designed for efficient execution by a software interpreter as well as being suitable for further compilation into machine code. An instruction set is a list of all the instructions and all their variations that a processor can execute In Computer science, an interpreter normally means a Computer program that executes, i Machine code or machine language is a system of instructions and data executed directly by a Computer 's Central processing unit. Since instructions are processed by software, they may be arbitrarily complex, but are nonetheless often akin to traditional hardware instructions; stack machines are common, for instance. In Computer science, a stack machine is a Model of computation in which the computer's memory takes the form of one or more stacks The term also refers Different parts may often be stored in separate files, similar to object modules, but dynamically loaded during execution. In Computer science, object code, or an object file, is the representation of code that a Compiler or Assembler generates by processing

The name bytecode stems from instruction sets which have one-byte opcodes followed by optional parameters. A byte (pronounced "bite" baɪt is the basic unit of measurement of information storage in Computer science. In computer technology an opcode ( op eration code) is the portion of a Machine language instruction that specifies the operation to be performed Intermediate representations such as bytecode may be output by programming language implementations to ease interpretation, or it may be used to reduce hardware and operating system dependence by allowing the same code to run on different platforms. A programming language is an Artificial language that can be used to write programs which control the behavior of a machine particularly a Computer. In Computer science, an interpreter normally means a Computer program that executes, i Bytecode may often be either directly executed on a virtual machine (i. In Computer science, a virtual machine (VM is a Software implementation of a machine (computer that executes programs like a real machine e. interpreter), or it may be further compiled into machine code for better performance.

Unlike human-readable source code, bytecodes are compact numeric codes, constants, and references (normally numeric addresses) which encode the result of parsing and semantic analysis of things like type, scope, and nesting depths of program objects. In Computer science, source code (commonly just source or code) is any sequence of statements or declarations written in some Human-readable A compiler is a Computer program (or set of programs that translates text written in a computer language (the source language) into another They therefore allow much better performance than direct interpretation of source code.

Execution

A bytecode program is normally executed by parsing the instructions one at a time. This kind of bytecode interpreter is very portable. Some systems, called dynamic translators, or "just-in-time" (JIT) compilers, translate bytecode into machine language as necessary at runtime: this makes the virtual machine unportable, but doesn't lose the portability of the bytecode itself. In Computing, just-in-time compilation ( JIT) also known as dynamic translation, is a technique for improving the runtime performance of a Computer In Computer science, runtime or run time describes the operation of a Computer program, the duration of its execution from beginning to termination For example, Java and Smalltalk code is typically stored in bytecoded format, which is typically then JIT compiled to translate the bytecode to machine code before execution. Smalltalk is an object-oriented, dynamically typed, reflective programming language. This introduces a delay before a program is run, when bytecode is compiled to native machine code, but improves execution speed considerably compared to interpretation - normally by several times.

Because of its performance advantage, today many language implementations execute a program in two phases, first compiling the source code into bytecode, and then passing them to the virtual machine. Therefore, there are virtual machines for Java, Python, PHP[1], Forth, and Tcl. Python is a general-purpose High-level programming language. Its design philosophy emphasizes programmer productivity and code readability PHP is a computer Scripting language. Originally designed for producing Dynamic web pages it has evolved to include a Command line interface capability Forth is a structured, imperative, stack-based, computer Programming language and programming environment Tcl (originally from "Tool Command Language" but nonetheless conventionally rendered as "Tcl" rather than "TCL" pronounced as " tickle " The current reference implementation of Perl and Ruby programming language instead work by walking an abstract syntax tree representation derived from the source code. NOTES FOR EDITORS "Perl" is not an acronym (read the "Name" section below Ruby is a dynamic, reflective, general purpose Object-oriented programming language that combines syntax inspired by Perl with Smalltalk In Computer science, an abstract syntax tree (AST or just syntax tree, is a tree representation of the Syntax of some Source code

Examples

Notes

  1. ^ Although PHP opcodes are generated each time the program is launched, and are always interpreted and not Just-In-Time compiled
Erlang is a general-purpose concurrent Programming language and Runtime system PHP is a computer Scripting language. Originally designed for producing Dynamic web pages it has evolved to include a Command line interface capability In Computing, just-in-time compilation ( JIT) also known as dynamic translation, is a technique for improving the runtime performance of a Computer

Dictionary

bytecode

-noun

  1. (computing) P-code.
© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
 Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic