1 - Partial Statements
The interpreter loop runs every line it receives, so partial
Lua statements are not being handled properly. This is a problem for
multiline breakpoint scripts since the interpreter loop, for this
particular case, is just an abstraction to a partially parsed function
This patch addresses this issue and as a side effect improves the
general Lua interpreter loop as well. It's now possible to write partial
statements in the 'script' command.
(lldb) script >>> do ..> local a = 123 ..> print(a) ..> end 123
The technique implemented is the same as the one employed by Lua's own REPL implementation.
Partial statements always errors out with the '<eof>' tag in the error
2 - LoadBuffer in Lua.h
In order to support (1), we need an API for just loading string buffers. This
was not available as so far we only needed to run string buffers.
3 - Multiline scripted breakpoints
Finally, with all the base features implemented this feature is
straightforward. The interpreter loop behaves exactly the same, the
difference is that it will aggregate all Lua statements into the body of
the breakpoint function. An explicit 'quit' statement is needed to exit the
(lldb) breakpoint command add -s lua Enter your Lua command(s). Type 'quit' to end. The commands are compiled as the body of the following Lua function function (frame, bp_loc, ...) end ..> print(456) ..> a = 123 ..> quit