Support for C definitions in luajit FFI

[fesily]

How to detect C string

1. Find cdef function according to meta information
2. Match directly based on string, may be false alarm

How compiler C code

1. Call luajit
2. Built-in luajit's C parsing module(too difficult)

How to work with lua-language-server

1. OnSetText
2. Use eventfile.watch 'compiler'
3. create new file ffi.d.lua to /tmp

Target

1. Function signature
2. Structure signature

Roadmap

• reference all ffi.cdef
• Built-in C parsing
• ffi.d.lua
• Support function signature
• Support structure signature

[fesily]

Need to sort the code blocks. Because of the context dependency, currently we have to guess (or compile with error messages) to sort and compile.

[fesily]

Not necessary anymore

[Frityet]

How to detect C string

1. Find cdef function according to meta information

2. ~Match directly based on string, may be false alarm~

How compiler C code

1. ~Call luajit~

2. Built-in luajit's C parsing module(too difficult)

How to work with lua-language-server

1. ~OnSetText~

2. Use event`file.watch 'compiler'`

3. create new file ffi.d.lua to /tmp

Target

1. Function signature

2. Structure signature

Roadmap

* [x]  reference all ffi.cdef

* [x]  Built-in C parsing

* [ ]  ffi.d.lua

* [ ]  Support function signature

* [ ]  Support structure signature

I was doing this actually, I am writing a C parser from scratch, the lexer is completed, if you want to contribute: https://github.com/Frityet/lls-cdef

[fesily]

I'm almost done with this feature, I'm not going to write it as a plugin, it will be built into the language server

[Frityet]

cool! I cant wait to see it

[fesily]

How to support ffi.typeof/ffi.new?

[fesily]

Give up support, and get myself into trouble. Ha ha, need generic support, the current generic support is too weak

[fesily]

This feature has been completed, in addition to new/typeof support, waiting for a more perfect generic support

[fesily]

@sumneko
关于性能问题:

1. c paser可以极大的简化,因为不需要完整的C99语法支持.并且可以使用C语言来解析
2. 能否直接将类型信息输出到最终的ast里,这样就不需要生成和解析一个新的文件

[sumneko]

现在的问题不是性能问题

1. 在我修改Lua版本为 LuaJIT 的下一秒，配置文件就会自动添加Lua.workspace.library
2. 即使我的代码里没有任何ffi相关的内容，也会自动添加Lua.workspace.library

[fesily]

这个可以改成延迟到检车到使用了FFI.在添加这个路径

[sumneko]

我觉得自动改配置不好，应该让用户手动拉取/刷新这个配置（比如通过执行命令）。

[fesily]

好吧,我研究一下,怎么改