[squeak-dev] FFI | How to call a function that expects a "long" argument in C?
marcel.taeumel at hpi.de
Tue Jun 9 17:19:16 UTC 2020
I want to understand how data models for 64-bit influence the image side of Squeak FFI.
I discovered that there are test functions in the SqueakFFIPrims plugin (sqFFITestFuncs.c) that expect actual "long" types. So, I assume that that is the "long" from C, not Squeak FFI, and thus different on 64-bit Windows vs. 64-bit Unix.
Only the last one is actually called from FFI Tests, which could be worse. Because there is not yet a mechanism in place that considers the data model an 64-bit platforms.
So, I think that an atomic type alias for such a C "long" argument could be defined like this:
(wordSize = 4 or: [platformName = 'Win32'])
ifTrue: ['long' "meaning 'int' in the plugin]
Yet, I have no clue on how to name such a type alias. long_t ? native_long_t ? Squeak FFI's 'long' is already taken, and it is always 4 byte.
Would it make sense to also query the data model through a primitive and add that to FFIPlatformDescription? LLP64, LP64, ILP64, SILP64, ...
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