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extism-dbg

Debugging for Extism plugins

extism-dbg

Installation

$ make && sudo make install

This will install extism-dbg and extism-lldb:

  • extism-dbg is a minimal Extism host used to wrap the plugin.
  • extism-lldb is a shim to use LLDB to debug Extism plugins called from extism-dbg

Usage

The following command will start LLDB with a breakpoint set on the specified plugin function, just type run at the LLDB prompt to start executing the plugin:

$ extism-lldb count-vowels.wasm count_vowels --input @input.txt

Arguments:

  1. WebAssembly module or Manifest file
  2. Function to call

See the output of extism-lldb --help for a list of options.

  • The --source parameter can be used to specify the search path(s) for the original source files
  • If the --input parameter starts with @ then the input will be loaded from a file otherwise it will be passed as-is.
  • --lldb can be used to specify the LLDB executable
  • Any arguments after the function name will be passed to LLDB directly