diswasm

WASM analysis workbench

Home Docs Reference Compiler Runtime Benchmarks Disassembly Decompile Edit Easy Editor Intermediate Create Saved Controller Game Studio About Licenses Contributors Open source

Theme

Local-first parsing. No automatic module execution.

self-hosted mode

Start Here

WebAssembly From First Principles WASM Compared With Flash And Plugins

Runtime

Runtime And VM Concepts Blob, ArrayBuffer, Fetch, And Streaming Linear Memory WASM Written In WASM Tables, Dynamic Dispatch, And References Modules, Instances, Imports, And Exports Globals And String Constants Runtime Interaction And Inspection ESM-Style WASM Loading WASM With Web APIs Threads

Compilation

Languages That Compile To WebAssembly Emscripten And JavaScript Glue

Binary

Binary Format And Module Structure

Security

Signing, Integrity, And Encryption

WAT

WAT And S-Expressions Stack Machine Model Function Syntax Types And Function Types Function Calls Imports Memory In WAT Memory And JavaScript Higher-Order Concepts String Examples And Base64 Scaffold

JavaScript API

JavaScript WebAssembly Namespace WebAssembly.Module WebAssembly.Global WebAssembly.Instance WebAssembly.Memory WebAssembly.Table Exceptions And Tags Compile, Link, And Runtime Errors

Binary Format

Reading WebAssembly Opcodes

JavaScript API

WebAssembly.Memory

Create, read, write, grow, share, and use memory without a WASM module.

memoryjavascriptstable

`WebAssembly.Memory` owns an `ArrayBuffer` or `SharedArrayBuffer`. JavaScript can use it even before a module is instantiated.

Growing a memory may detach old ArrayBuffer views.
Shared memory requires maximum bounds and cross-origin isolation.
Use typed arrays for structured reads and writes.

References

WebAssembly.Memory