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Add support for closure api

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This commit is contained in:
Arnaud Castellanos Galea 2020-10-05 10:22:56 +08:00
commit b613920f1f
1 changed files with 25 additions and 0 deletions
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libffi.nim
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@ -161,5 +161,30 @@ proc prep_cif*(cif: var TCif; abi: TABI; nargs: cuint; rtype: ptr Type;
proc call*(cif: var TCif; fn, rvalue: pointer;
avalue: ArgList) {.cdecl, importc: "ffi_call", mylib.}
when defined(x8664):
const TRAMPOLINE_SIZE = 24
elif defined(windows) and defined(x86):
const TRAMPOLINE_SIZE = 52
elif defined(amd64) and defined(windows):
const TRAMPOLINE_SIZE = 29
else:
const TRAMPOLINE_SIZE = 10
type
ClosureProc = proc (cif: var TCif, ret: pointer, args: UncheckedArray[pointer], user_data: pointer) {.cdecl.}
Closure* {.pure, final.} = object
tramp: array[0..TRAMPOLINE_SIZE, uint8]
cif: ptr TCif
fun: ClosureProc
user_data: pointer
proc closure_alloc*(size: int, code: var pointer): ptr Closure {.cdecl, importc: "ffi_closure_alloc", mylib.}
# same but taking care of the size
template closure_alloc*(code: var pointer): ptr Closure =
closure_alloc(sizeof(ClosureProc), code)
proc closure_free*(closure: ptr Closure) {.cdecl, importc: "ffi_closure_free", mylib.}
proc prep_closure_loc*(closure: ptr Closure, cif: var TCif, fun: ClosureProc, user_data: pointer, codeloc: pointer): Status {.cdecl, importc: "ffi_prep_closure_loc", mylib.}
# Useful for eliminating compiler warnings
##define FFI_FN(f) ((void (*)(void))f)