wasm-objdump

Display WebAssembly binary file information

TLDR

Show all information

$ wasm-objdump [file.wasm]

Display headers only

$ wasm-objdump -h [file.wasm]

Disassemble function bodies

$ wasm-objdump -d [file.wasm]

Show section details

$ wasm-objdump -x [file.wasm]

Show raw section contents

$ wasm-objdump -s [file.wasm]

Examine specific section

$ wasm-objdump -j [Code] [file.wasm]

Show relocations with disassembly

$ wasm-objdump -d -r [file.wasm]

wasm-objdump displays information about WebAssembly binary (.wasm) files. It's part of WABT (WebAssembly Binary Toolkit) and functions similarly to objdump for native binaries.The tool inspects module structure including imports, exports, functions, globals, memory layout, and WebAssembly bytecode instructions. It's essential for debugging, reverse engineering, and understanding compiled WebAssembly output.Use cases include performance analysis, security audits, and verifying compiler output. The disassembly mode shows WebAssembly instructions with function boundaries.

PARAMETERS

-h, --headers

Print section headers.

-d, --disassemble

Disassemble function bodies.

-x, --details

Show section details.

-s, --full-contents

Print raw section contents.

-j, --section name

Select specific section.

-r, --reloc

Show relocations with disassembly.

--debug

Print debug information.

--section-offsets

Show section offsets in disassembly.

--help

Display help.

--version

Display version.

INSTALL

sudo apt install wabt

sudo dnf install wabt

sudo pacman -S wabt

brew install wabt

nix profile install nixpkgs#wabt

CAVEATS

Only works with WebAssembly binaries, not native executables. Large modules may produce verbose output. Part of WABT package.

HISTORY

wasm-objdump is part of WABT, the WebAssembly Binary Toolkit developed by the WebAssembly Community Group. WABT provides essential tools for working with the WebAssembly format, enabling developers to inspect and manipulate .wasm files.