[lldb-dev] Calling const char* functions from within lldb
ck at remobjects.com
Tue Mar 5 10:43:59 PST 2013
Op 5-3-2013 19:25, Sean Callanan schreef:
> you can see an example of ClangFunctions at work in
> AppleObjCRuntime::GetObjectDescription, although it doesn’t provide a
> good example of the following wrinkle:
> If you make a value object with your string, the string value will not
> be in target memory and calling the function will result in a crash.
> You need to manually call Process::AllocateMemory and put your string in
> there, and then create a value with type char* containing the pointer to
> your string.
> As Greg says, though, if you are trying to do run ClangFunctions
> piecemeal to replicate the action of an expression, then you are not
> going to win vs. just parsing the expression and running it.
Thanks for the helpful comments (both of you). For this particular
expression I wanted to get the 'name' property on an NSException so I
can show both the Name and class for an exception message in the IDE,
which works now:
I call the sel_registerName with allocateMemory to get a selector, cache
the selector name (per process), releasememroy to release that, and
after that just call msgSend. As Greg said there's no convenient
"ClangJITCode" class yet I can use for this.
for the "Watches" support though, I don't think there is a good way to
do it yet, except maybe converting the Pascal input to Objc on the fly
and calling evaluate expression api. I can't require my users to enter
watches in with a c syntax.
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