silvanshade / awesome-wasm-tools

😎 A curated list of awesome, language-agnostic WebAssembly tools

Awesome WebAssembly Tools

A collection of useful, language-agnostic WebAssembly development tools.

Please read the contribution guidelines if you want to contribute.

Inspecting

• WebAssembly Code Explorer | online tool
  A simple binary explorer with neat binary code highlighting.

• wasm-opt | part of Binaryen

  • Color output of s-expression format:
    wasm-opt --print test.wasm
  • Plot the callgraph using Graphviz:
    wasm-opt --print-call-graph test.wasm | dot -Tpng -o callgraph.png
  • Dump DWARF debug info sections:
    wasm-opt --dwarfdump test.wasm
  • Print function metrics:
    wasm-opt --func-metrics test.wasm

• wasm-decompile | part of WABT, article
  wasm-decompile decompiles a wasm binary into readable code. It generates output that tries to look like a "very average programming language" while still staying close to the wasm it represents.

• wasm-objdump | part of WABT
  Print low-level details about a .wasm binary and each of its sections.

• wasm-nm | repo
  List the imported, exported, and private function symbols defined within a .wasm binary.

Static analysis

• Twiggy | repo
  Code size profiler, analyzes a binary's call graph.

• Manticore | repo, article
  Symbolic execution of WebAssembly binaries.

• wasm-opcodecnt | part of WABT
  Count wasm opcode usage statistics.

Manipulating (optimization, transformation, instrumentation)

• wasm-opt | part of Binaryen

  • Transform binary for asynchronous execution (read more in this article):
    wasm-opt test.wasm --asyncify -O3 -o asyncified.wasm
  • Instrument binary for dynamic execution tracing:
    wasm-opt test.wasm --instrument-memory --instrument-locals --log-execution -o instrumetred.wasm

• wizer | repo
  Don't wait for your Wasm module to initialize itself, pre-initialize it! Wizer instantiates your WebAssembly module, executes its initialization function, and then snapshots the initialized state out into a new WebAssembly module.

• wasm-snip | repo
  Replaces a WebAssembly function's body with an unreachable.

• wasm-meter | npm, repo
  Injects metering into webassembly binaries. This counts computation time for a given program in units of gas (and allows limiting it).

• wasm2json, json2wasm | npm, repo
  A small toolkit for converting wasm binaries into json and back. Very helpful for experimenting and creating your own transformations.

Dynamic analysis (tracing, profiling)

• wasm3-strace | wapm, repo
  Structured, seamless tracing of arbitrary WebAssembly/WASI execution.

• Wasabi | home, repo
  "WebAssembly analysis using binary instrumentation", a dynamic analysis framework.

Source-level debugging

• Chrome DevTools | article

• LLDB | article

Other

• WebAssembly Opcode Table | online tool

• Webassembly.sh | online tool