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api.c
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api.c
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/*
Copyright (C) 2001-2011, Parrot Foundation.
=head1 NAME
src/nci/api.c - Native Call Interface routines
=head1 DESCRIPTION
This file implements the interface to the Parrot Native Call Interface system,
which builds parrot to C call frames.
=head2 Functions
=over 4
=cut
*/
#include "parrot/parrot.h"
#include "parrot/nci.h"
#include "api.str"
/* HEADERIZER HFILE: include/parrot/nci.h */
/*
=item C<PMC * build_call_func(PARROT_INTERP, PMC *sig)>
This function serves a single purpose. It takes the function signature for a
C function we want to call and returns a PMC with a pointer to a function
that can call it.
=cut
*/
PARROT_CANNOT_RETURN_NULL
PMC *
build_call_func(PARROT_INTERP, ARGIN(PMC *sig))
{
ASSERT_ARGS(build_call_func)
PMC * const iglobals = interp->iglobals;
PMC *nci_funcs;
PMC *thunk;
if (PMC_IS_NULL(iglobals))
PANIC(interp, "iglobals isn't created yet");
nci_funcs = VTABLE_get_pmc_keyed_int(interp, iglobals, IGLOBALS_NCI_FUNCS);
if (PMC_IS_NULL(nci_funcs))
PANIC(interp, "iglobals.nci_funcs isn't created_yet");
/* signatures are FIA internally */
if (sig->vtable->base_type != enum_class_FixedIntegerArray) {
size_t i;
size_t n = VTABLE_elements(interp, sig);
PMC *new_sig = Parrot_pmc_new_init_int(interp, enum_class_FixedIntegerArray, n);
for (i = 0; i < n; i++)
VTABLE_set_integer_keyed_int(interp, new_sig, i,
VTABLE_get_integer_keyed_int(interp, sig, i));
sig = new_sig;
}
thunk = VTABLE_get_pmc_keyed(interp, nci_funcs, sig);
if (PMC_IS_NULL(thunk)) {
/* try to dynamically build a thunk */
PMC * const nci_fb_cb = VTABLE_get_pmc_keyed_int(interp, iglobals, IGLOBALS_NCI_FB_CB);
if (!PMC_IS_NULL(nci_fb_cb)) {
void * const cb_ptr = VTABLE_get_pointer(interp, nci_fb_cb);
const nci_fb_func_t cb = (nci_fb_func_t)D2FPTR(cb_ptr);
if (cb_ptr) {
PMC * const nci_fb_ud =
VTABLE_get_pmc_keyed_int(interp, iglobals, IGLOBALS_NCI_FB_UD);
thunk = cb(interp, nci_fb_ud, sig);
}
}
}
if (!PMC_IS_NULL(thunk)) {
PARROT_ASSERT(thunk->vtable);
return thunk;
}
Parrot_ex_throw_from_c_args(interp, NULL,
EXCEPTION_UNIMPLEMENTED,
"No NCI thunk available for signature `%Ss'", Parrot_nci_describe_sig(interp, sig));
}
/*
=back
=cut
*/
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4 cinoptions='\:2=2' :
*/