cfbolz changed the topic of #pypy to: PyPy, the flexible snake (IRC logs: https://quodlibet.duckdns.org/irc/pypy/latest.log.html#irc-end ) | use cffi for calling C | if a pep adds a mere 25-30 [C-API] functions or so, it's a drop in the ocean (cough) - Armin
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<muke>
hey, I have a couple questions about using the rffi
<muke>
there are some functions in the LLVM API that require you stack allocate a pointer which you then pass a referance for it to write a result into, is this possible with the rffi without using malloc? If not I'm thinking using a wrapper might be easiest
<muke>
Also, is there an existing way of using enums with the low level types? I've typedef'ed enums to signed ints for now which works fine for passing them around, but if I need to intiailize one myself is that possible or again should I be looking at a wrapper?
<arigo>
muke: these two features are not really supported by rffi, indeed, so wrappers look good
<muke>
right I had thought so, thanks for confirming
<arigo>
not sure what you mean by "initialize one yourself"?
<muke>
lastly, the way llvm expects you to execute compiled code (without writing to disk) is to retrieve the address of a symbol then cast it to the right type of function pointer, is that at all possible?
<muke>
well I have a function which takes an enum defined in the library, I'm not sure how to initialize that argument myself from within rpython before calling the function
<arigo>
enum values are just constants, in C
<muke>
Is there a reliable way to find which numerical value they each map to though? Sorry this is probably more of a C specific question
<arigo>
yes, like for other constants
<muke>
ok I'll do some research into that, that should be fine then
<arigo>
in C you write "enum foo { A, B, C }" but really the names "A", "B" and "C" are global constants, and there is support in rffi to get their value without hard-coding it
<muke>
ahh, ok that's what I was wondering about
<arigo>
and to cast a raw address to a function pointer, yes, use rffi.cast(). the function pointer type must be known at translation time
<arigo>
e.g. lltype.Ptr(lltype.Func(...))
<muke>
cool, I had seen that function but wasn't sure if it would have support for a more elaborate use like that
<muke>
thanks for the info
<arigo>
:-)
<cfbolz>
muke: look for DefinedConstantInteger
<muke>
cfbolz so I just pass the enum type name as the 'macro' argument and the rffi handles the rest?
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<cfbolz>
muke: think so
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<arigo>
muke: DefinedConstantInteger takes the individual name of the constant, you don't specify the enum type at all
<muke>
arigo sorry yea that's what I meant - if you had enum foo {A, B, C} you'd pass A and that'd be enough, right?
<arigo>
yes
<muke>
great
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