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@webassemblyjs/helper-wasm-section

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@webassemblyjs/helper-wasm-section


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Maintainers
1
Weekly downloads
18,784,558
decreased by-17.99%
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527 kB

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Package description

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);

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Last updated on 13 Mar 2024

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