deepactivelines is a C module for Lua and LuaJIT that allows listing all
active lines within a Lua function, that is, all lines that can trigger
a line debug hook. Standard Lua function debug.get_info can list active
lines directly inside a function, but not inside nested functions.
Warning: deepactivelines uses internal Lua functions and definitions. It is (will be) tested with Lua 5.1.5, Lua 5.2.4, Lua 5.3.2, LuaJIT 2.0.4, and LuaJIT 2.1.0-beta2, but it may not work for other versions, and definitely not for any alternative Lua implementations. Supporting as many Lua and LuaJIT versions as possible is a goal, however.
MIT. deepactivelines bundles some header files from Lua and LuaJIT, which use MIT as well.