@webassemblyjs/helper-wasm-section

What is @webassemblyjs/helper-wasm-section?

The @webassemblyjs/helper-wasm-section package is part of the WebAssemblyJS project and provides utility functions for manipulating sections in WebAssembly (Wasm) binary files. It allows developers to parse, add, or modify sections within a Wasm binary, which can be useful for tasks such as Wasm optimization, analysis, or transformation.

What are @webassemblyjs/helper-wasm-section's main functionalities?

Parsing a Wasm section

This feature allows you to parse a specific section of a WebAssembly binary. The code sample demonstrates how to use the `getSectionMetadata` function to retrieve metadata for the 'type' section of a Wasm binary.

const { decode } = require('@webassemblyjs/wasm-parser');
const { getSectionMetadata } = require('@webassemblyjs/helper-wasm-section');

const wasmBuffer = ...; // A buffer containing the Wasm binary
const ast = decode(wasmBuffer);
const typeSectionMetadata = getSectionMetadata(ast, 'type');

Adding a new Wasm section

This feature allows you to add a new section to a WebAssembly binary. The code sample shows how to use the `addSection` function to add a new section to the AST of a Wasm binary and then encode it back into a binary format.

const { addSection } = require('@webassemblyjs/helper-wasm-section');
const { encode } = require('@webassemblyjs/wasm-gen');

const ast = ...; // The AST of a Wasm binary
const newSection = ...; // The new section to add
addSection(ast, newSection);
const newWasmBuffer = encode(ast);

Modifying an existing Wasm section

This feature allows you to modify the content of an existing section in a WebAssembly binary. The code sample illustrates how to use the `editSection` function to change the content of the 'code' section in the AST and then encode the modified AST back into a binary.

const { editSection } = require('@webassemblyjs/helper-wasm-section');
const { encode } = require('@webassemblyjs/wasm-gen');

const ast = ...; // The AST of a Wasm binary
const sectionName = 'code';
const newContent = ...; // The new content for the section
editSection(ast, sectionName, newContent);
const newWasmBuffer = encode(ast);

Other packages similar to @webassemblyjs/helper-wasm-section

wasm-edit

The wasm-edit package is also part of the WebAssemblyJS project and provides a higher-level API for manipulating Wasm binaries. It includes functionality to add, remove, and update sections, similar to @webassemblyjs/helper-wasm-section, but with a more abstracted interface.

wasm-opt

wasm-opt is a tool from the Binaryen project that optimizes Wasm binaries. It operates at a different level compared to @webassemblyjs/helper-wasm-section, providing optimizations and transformations on the binary rather than offering APIs for manual section manipulation.

README

The README file is missing