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Fast, lightweight JavaScript x64 assembler

Package Exports

  • @defasm/core
  • @defasm/core/compiler.js
  • @defasm/core/directives.js
  • @defasm/core/instructions.js
  • @defasm/core/mnemonicList.js
  • @defasm/core/operands.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@defasm/core) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

DefAssembler - Core

A fast and lightweight JavaScript x86-64 assembler, for use both in browsers and as a Node.js package.

DefAssembler is built from scratch without the use of any additional libraries, making it relatively lightweight (~100 KB) and fast.

Usage

This package exports a command-line program called defasm, with which you can assemble and (optionally) execute Assembly source code. Install the package globally with npm install -g @defasm/core and run defasm --help for more information.

The assembler parses AT&T syntax; the command-line utility is functional only on Linux.

Live assembly

A special feature of the assembler is the concept of "live assembly" - the ability to write code in an editor and have the binary dumps be generated and displayed in real time. This feature is demonstrated on the GitHub Pages site for DefAssembler, through the codemirror package which utilizes the assembler within a CodeMirror 6 extension.

Live assembly is made efficient by re-assembling specific segments of the source code, in accordance with the actions of the user. For example, if the user is editing a 6,000-line document, the assembler can be configured such that a one line change will result in a re-assembly of only that one line, rather than the entire code. The codemirror package (in particular, the asmPlugin.js file) illustrates how this is done.