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View Code? Open in Web Editor NEWA toy interpreter of lua-like language
License: MIT License
A toy interpreter of lua-like language
License: MIT License
do
local a = {}
for i = 1,2 do
a[i] = function() i = i+1; print(i); end
end
local b = 1 -- 如果这行不注释,下面执行会出错
a[1]()
end
根据字节码,运行到i=i+1时。把常量1加载到以前这个位置是upvalue值上,也就是修改到了闭包上,并没有修改到寄存器上。在后面进行运算OpType_ADD中使用的相应寄存器的内容。原因VM.cpp文件中OpType_LoadConst指令,在*GET_REAL_VALUE(a)=*b后面直接改为
*a = *b
其实OpType_FillNil指令使得变量不是闭包变量,也就能够赋值成功。
闭包捕获,跟lua不一致的原因。虽然生成了不同closure,但是value是指向了同一个地址。
例子:
function get_table(...)
return {1,...}
end
a = get_table(2,3)
返回的是{1,2}
,lua的是{1,2,3}
I'm looking into using this for an open source embedded project, but it lacks a license, so I can't. If you could add an MIT or GPL license, that would be great.
Add JIT backend engine.
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