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#include <fiddle.h>
VALUE cFiddleClosure;
typedef struct {
void * code;
ffi_closure *pcl;
ffi_cif cif;
int argc;
ffi_type **argv;
} fiddle_closure;
#if defined(MACOSX) || defined(__linux) || defined(__OpenBSD__)
#define DONT_USE_FFI_CLOSURE_ALLOC
#endif
static void
dealloc(void * ptr)
{
fiddle_closure * cls = (fiddle_closure *)ptr;
#ifndef DONT_USE_FFI_CLOSURE_ALLOC
ffi_closure_free(cls->pcl);
#else
munmap(cls->pcl, sizeof(cls->pcl));
#endif
if (cls->argv) xfree(cls->argv);
xfree(cls);
}
static size_t
closure_memsize(const void * ptr)
{
fiddle_closure * cls = (fiddle_closure *)ptr;
size_t size = 0;
if (ptr) {
size += sizeof(*cls);
#if !defined(FFI_NO_RAW_API) || !FFI_NO_RAW_API
size += ffi_raw_size(&cls->cif);
#endif
size += sizeof(*cls->argv);
size += sizeof(ffi_closure);
}
return size;
}
const rb_data_type_t closure_data_type = {
"fiddle/closure",
{0, dealloc, closure_memsize,},
};
void
callback(ffi_cif *cif, void *resp, void **args, void *ctx)
{
VALUE self = (VALUE)ctx;
VALUE rbargs = rb_iv_get(self, "@args");
VALUE ctype = rb_iv_get(self, "@ctype");
int argc = RARRAY_LENINT(rbargs);
VALUE *params = xcalloc(argc, sizeof(VALUE *));
VALUE ret;
VALUE cPointer;
int i, type;
cPointer = rb_const_get(mFiddle, rb_intern("Pointer"));
for (i = 0; i < argc; i++) {
type = NUM2INT(RARRAY_PTR(rbargs)[i]);
switch (type) {
case TYPE_VOID:
argc = 0;
break;
case TYPE_INT:
params[i] = INT2NUM(*(int *)args[i]);
break;
case TYPE_VOIDP:
params[i] = rb_funcall(cPointer, rb_intern("[]"), 1,
PTR2NUM(*(void **)args[i]));
break;
case TYPE_LONG:
params[i] = LONG2NUM(*(long *)args[i]);
break;
case TYPE_CHAR:
params[i] = INT2NUM(*(char *)args[i]);
break;
case TYPE_DOUBLE:
params[i] = rb_float_new(*(double *)args[i]);
break;
case TYPE_FLOAT:
params[i] = rb_float_new(*(float *)args[i]);
break;
#if HAVE_LONG_LONG
case TYPE_LONG_LONG:
params[i] = rb_ull2inum(*(unsigned LONG_LONG *)args[i]);
break;
#endif
default:
rb_raise(rb_eRuntimeError, "closure args: %d", type);
}
}
ret = rb_funcall2(self, rb_intern("call"), argc, params);
type = NUM2INT(ctype);
switch (type) {
case TYPE_VOID:
break;
case TYPE_LONG:
*(long *)resp = NUM2LONG(ret);
break;
case TYPE_CHAR:
*(char *)resp = NUM2INT(ret);
break;
case TYPE_VOIDP:
*(void **)resp = NUM2PTR(ret);
break;
case TYPE_INT:
*(int *)resp = NUM2INT(ret);
break;
case TYPE_DOUBLE:
*(double *)resp = NUM2DBL(ret);
break;
case TYPE_FLOAT:
*(float *)resp = (float)NUM2DBL(ret);
break;
#if HAVE_LONG_LONG
case TYPE_LONG_LONG:
*(unsigned LONG_LONG *)resp = rb_big2ull(ret);
break;
#endif
default:
rb_raise(rb_eRuntimeError, "closure retval: %d", type);
}
xfree(params);
}
static VALUE
allocate(VALUE klass)
{
fiddle_closure * closure;
VALUE i = TypedData_Make_Struct(klass, fiddle_closure,
&closure_data_type, closure);
#ifndef DONT_USE_FFI_CLOSURE_ALLOC
closure->pcl = ffi_closure_alloc(sizeof(ffi_closure), &closure->code);
#else
closure->pcl = mmap(NULL, sizeof(ffi_closure), PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE, -1, 0);
#endif
return i;
}
static VALUE
initialize(int rbargc, VALUE argv[], VALUE self)
{
VALUE ret;
VALUE args;
VALUE abi;
fiddle_closure * cl;
ffi_cif * cif;
ffi_closure *pcl;
ffi_status result;
int i, argc;
if (2 == rb_scan_args(rbargc, argv, "21", &ret, &args, &abi))
abi = INT2NUM(FFI_DEFAULT_ABI);
Check_Type(args, T_ARRAY);
argc = RARRAY_LENINT(args);
TypedData_Get_Struct(self, fiddle_closure, &closure_data_type, cl);
cl->argv = (ffi_type **)xcalloc(argc + 1, sizeof(ffi_type *));
for (i = 0; i < argc; i++) {
int type = NUM2INT(RARRAY_PTR(args)[i]);
cl->argv[i] = INT2FFI_TYPE(type);
}
cl->argv[argc] = NULL;
rb_iv_set(self, "@ctype", ret);
rb_iv_set(self, "@args", args);
cif = &cl->cif;
pcl = cl->pcl;
result = ffi_prep_cif(cif, NUM2INT(abi), argc,
INT2FFI_TYPE(NUM2INT(ret)),
cl->argv);
if (FFI_OK != result)
rb_raise(rb_eRuntimeError, "error prepping CIF %d", result);
#ifndef DONT_USE_FFI_CLOSURE_ALLOC
result = ffi_prep_closure_loc(pcl, cif, callback,
(void *)self, cl->code);
#else
result = ffi_prep_closure(pcl, cif, callback, (void *)self);
cl->code = (void *)pcl;
mprotect(pcl, sizeof(pcl), PROT_READ | PROT_EXEC);
#endif
if (FFI_OK != result)
rb_raise(rb_eRuntimeError, "error prepping closure %d", result);
return self;
}
static VALUE
to_i(VALUE self)
{
fiddle_closure * cl;
void *code;
TypedData_Get_Struct(self, fiddle_closure, &closure_data_type, cl);
code = cl->code;
return PTR2NUM(code);
}
void
Init_fiddle_closure()
{
cFiddleClosure = rb_define_class_under(mFiddle, "Closure", rb_cObject);
rb_define_alloc_func(cFiddleClosure, allocate);
rb_define_method(cFiddleClosure, "initialize", initialize, -1);
rb_define_method(cFiddleClosure, "to_i", to_i, 0);
}
/* vim: set noet sw=4 sts=4 */
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