Re: debug.setlocal does not correctly restore values for variables localized inside subblocks (or so it seems)
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- Subject: Re: debug.setlocal does not correctly restore values for variables localized inside subblocks (or so it seems)
- From: Declan White <deco.da.man@...>
- Date: 2012年7月20日 05:45:33 +0000 (UTC)
Paul K <paulclinger <at> yahoo.com> writes:
>
> I came across this issue while investigating a bug in my debugger (MobDebug).
>
> It looks like debug.setlocal does not correctly restore variables that
> are localized inside subblocks in a function.
>
Paul,
You are storing the local variables by name, but their identifying key is
numeric.
Here's how your code plays out:
function f()
local a = 1
do
local a = 2
end
end
t = {}
t['a'] = 1 -- finds local #1
t['a'] = 2 -- finds local #2, this overrides the value in the table, as I'm sure
you understand
local #1 = t['a'] -- sets the top a to 2
local #2 = t['a'] -- sets the bottom a to 2
To solve this, simply store by numeric local ID, rather than name.
e.g:
local vars, i = {}, 1
while true do
local name, value = debug.getlocal(func, i)
vars[i] = value
i = i+1
end
-- same idea for restore code
Hope this helps,
Declan.