[LLVMdev] Accessing arguments in a caller

[Carlo Alberto Ferraris]

I need some advice on "forwarding" arguments to a callee. Suppose I have 
a function F that is called at the beginning of all other functions in 
the module. From F I need to access (read) the arguments passed to its 
immediate caller. Right now I do something like boxing all arguments in 
the caller inside a struct and passing a pointer to the struct to F, 
alongside an identifier telling which caller F is being called from. F 
has then a giant switch that branches to the appropriate unboxing code. 
This is obviously suboptimal because I need to allocate the struct on 
the stack, copy the arguments inside of it and then passing an 
additional pointer to F.
I was wondering if there's a better way to do this, e.g. a way to access 
the stack frame of the caller (knowing, thanks to the identifier, which 
caller F was called from) or, more in general, arbitrary values defined 
in the caller. Any suggestions?
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