cons_t* proc_ffi_prep_cif_var(cons_t* p, environment_t*)
{
assert_length(p, 3, 4);
ffi_abi abi = FFI_DEFAULT_ABI;
/*
* ARGUMENT 1: ABI for foreign function
*/
abi = parse_ffi_abi(car(p));
/*
* ARGUMENT 2:
* Return type for foreign function
*/
ffi_type* rtype = parse_ffi_type(cadr(p));
/*
* ARGUMENT 3:
* Number of fixed vars
*/
assert_type(INTEGER, caddr(p));
unsigned int fixedargs = caddr(p)->number.integer;
/*
* ARGUMENT 4:
* Types for foreign function's input parameters.
*/
ffi_type** argtypes = NULL;
unsigned int nargs = 0;
if ( length(p) >= 4 ) {
cons_t *args = cadddr(p);
assert_type(PAIR, args);
nargs = length(args);
if ( nargs > 0 ) {
argtypes = static_cast<ffi_type**>(malloc(nargs*sizeof(ffi_type*)));
for ( unsigned int n=0; n<nargs; ++n ) {
argtypes[n] = parse_ffi_type(car(args));
args = cdr(args);
}
}
}
/*
* Initialize returned struct
*/
ffi_cif *cif = new ffi_cif();
memset(cif, 0, sizeof(ffi_cif));
check(ffi_prep_cif_var(cif, abi, fixedargs, nargs, rtype, argtypes));
return pointer(tag_ffi_cif, cif);
/*
* In the future, the malloced argtypes should be added to the
* pointer-return value here, so that it too can be freed.
*/
}
callback*
create_callback(JNIEnv* env, jobject obj, jobject method,
jobjectArray arg_classes, jclass return_class,
callconv_t calling_convention,
jint options,
jstring encoding) {
jboolean direct = options & CB_OPTION_DIRECT;
jboolean in_dll = options & CB_OPTION_IN_DLL;
callback* cb;
ffi_abi abi = (calling_convention == CALLCONV_C
? FFI_DEFAULT_ABI : (ffi_abi)calling_convention);
ffi_abi java_abi = FFI_DEFAULT_ABI;
ffi_type* return_type;
ffi_status status;
jsize argc;
JavaVM* vm;
int rtype;
char msg[MSG_SIZE];
int i;
int cvt = 0;
const char* throw_type = NULL;
const char* throw_msg = NULL;
if ((*env)->GetJavaVM(env, &vm) != JNI_OK) {
throwByName(env, EUnsatisfiedLink, "Couldn't obtain Java VM reference when creating native callback");
return NULL;
}
argc = (*env)->GetArrayLength(env, arg_classes);
cb = (callback *)malloc(sizeof(callback));
cb->closure = ffi_closure_alloc(sizeof(ffi_closure), &cb->x_closure);
cb->saved_x_closure = cb->x_closure;
cb->object = (*env)->NewWeakGlobalRef(env, obj);
cb->methodID = (*env)->FromReflectedMethod(env, method);
cb->vm = vm;
cb->arg_types = (ffi_type**)malloc(sizeof(ffi_type*) * argc);
cb->java_arg_types = (ffi_type**)malloc(sizeof(ffi_type*) * (argc + 3));
cb->arg_jtypes = (char*)malloc(sizeof(char) * argc);
cb->conversion_flags = (int *)malloc(sizeof(int) * argc);
cb->rflag = CVT_DEFAULT;
cb->arg_classes = (jobject*)malloc(sizeof(jobject) * argc);
cb->direct = direct;
cb->java_arg_types[0] = cb->java_arg_types[1] = cb->java_arg_types[2] = &ffi_type_pointer;
cb->encoding = newCStringUTF8(env, encoding);
for (i=0;i < argc;i++) {
int jtype;
jclass cls = (*env)->GetObjectArrayElement(env, arg_classes, i);
if ((cb->conversion_flags[i] = get_conversion_flag(env, cls)) != CVT_DEFAULT) {
cb->arg_classes[i] = (*env)->NewWeakGlobalRef(env, cls);
cvt = 1;
}
else {
cb->arg_classes[i] = NULL;
}
jtype = get_java_type(env, cls);
if (jtype == -1) {
snprintf(msg, sizeof(msg), "Unsupported callback argument at index %d", i);
throw_type = EIllegalArgument;
throw_msg = msg;
goto failure_cleanup;
}
cb->arg_jtypes[i] = (char)jtype;
cb->java_arg_types[i+3] = cb->arg_types[i] = get_ffi_type(env, cls, cb->arg_jtypes[i]);
if (!cb->java_arg_types[i+3]) {
goto failure_cleanup;
}
if (cb->conversion_flags[i] == CVT_NATIVE_MAPPED
|| cb->conversion_flags[i] == CVT_POINTER_TYPE
|| cb->conversion_flags[i] == CVT_INTEGER_TYPE) {
jclass ncls;
ncls = getNativeType(env, cls);
jtype = get_java_type(env, ncls);
if (jtype == -1) {
snprintf(msg, sizeof(msg), "Unsupported NativeMapped callback argument native type at argument %d", i);
throw_type = EIllegalArgument;
throw_msg = msg;
goto failure_cleanup;
}
cb->arg_jtypes[i] = (char)jtype;
cb->java_arg_types[i+3] = &ffi_type_pointer;
cb->arg_types[i] = get_ffi_type(env, ncls, cb->arg_jtypes[i]);
if (!cb->arg_types[i]) {
goto failure_cleanup;
}
}
// Java callback method is called using varargs, so promote floats to
// double where appropriate for the platform
if (cb->arg_types[i]->type == FFI_TYPE_FLOAT) {
cb->java_arg_types[i+3] = &ffi_type_double;
cb->conversion_flags[i] = CVT_FLOAT;
cvt = 1;
}
else if (cb->java_arg_types[i+3]->type == FFI_TYPE_STRUCT) {
// All callback structure arguments are passed as a jobject
cb->java_arg_types[i+3] = &ffi_type_pointer;
}
}
if (!direct || !cvt) {
free(cb->conversion_flags);
cb->conversion_flags = NULL;
free(cb->arg_classes);
cb->arg_classes = NULL;
}
if (direct) {
cb->rflag = get_conversion_flag(env, return_class);
if (cb->rflag == CVT_NATIVE_MAPPED
|| cb->rflag == CVT_INTEGER_TYPE
|| cb->rflag == CVT_POINTER_TYPE) {
return_class = getNativeType(env, return_class);
}
}
#if defined(_WIN32)
if (calling_convention == CALLCONV_STDCALL) {
#if defined(_WIN64) || defined(_WIN32_WCE)
// Ignore requests for stdcall on win64/wince
abi = FFI_DEFAULT_ABI;
#else
abi = FFI_STDCALL;
// All JNI entry points on win32 use stdcall
java_abi = FFI_STDCALL;
#endif
}
#endif // _WIN32
if (!(abi > FFI_FIRST_ABI && abi < FFI_LAST_ABI)) {
snprintf(msg, sizeof(msg), "Invalid calling convention %d", abi);
throw_type = EIllegalArgument;
throw_msg = msg;
goto failure_cleanup;
}
rtype = get_java_type(env, return_class);
if (rtype == -1) {
throw_type = EIllegalArgument;
throw_msg = "Unsupported callback return type";
goto failure_cleanup;
}
return_type = get_ffi_return_type(env, return_class, (char)rtype);
if (!return_type) {
throw_type = EIllegalArgument;
throw_msg = "Error in callback return type";
goto failure_cleanup;
}
status = ffi_prep_cif(&cb->cif, abi, argc, return_type, cb->arg_types);
if (!ffi_error(env, "callback setup", status)) {
ffi_type* java_return_type = return_type;
if (cb->rflag == CVT_STRUCTURE_BYVAL
|| cb->rflag == CVT_NATIVE_MAPPED
|| cb->rflag == CVT_POINTER_TYPE
|| cb->rflag == CVT_INTEGER_TYPE) {
// Java method returns a jobject, not a struct
java_return_type = &ffi_type_pointer;
rtype = '*';
}
switch(rtype) {
#define OFFSETOF(ENV,METHOD) ((size_t)((char *)&(*(ENV))->METHOD - (char *)(*(ENV))))
case 'V': cb->fptr_offset = OFFSETOF(env, CallVoidMethod); break;
case 'Z': cb->fptr_offset = OFFSETOF(env, CallBooleanMethod); break;
case 'B': cb->fptr_offset = OFFSETOF(env, CallByteMethod); break;
case 'S': cb->fptr_offset = OFFSETOF(env, CallShortMethod); break;
case 'C': cb->fptr_offset = OFFSETOF(env, CallCharMethod); break;
case 'I': cb->fptr_offset = OFFSETOF(env, CallIntMethod); break;
case 'J': cb->fptr_offset = OFFSETOF(env, CallLongMethod); break;
case 'F': cb->fptr_offset = OFFSETOF(env, CallFloatMethod); break;
case 'D': cb->fptr_offset = OFFSETOF(env, CallDoubleMethod); break;
default: cb->fptr_offset = OFFSETOF(env, CallObjectMethod); break;
}
status = ffi_prep_cif_var(&cb->java_cif, java_abi, 2, argc+3, java_return_type, cb->java_arg_types);
if (!ffi_error(env, "callback setup (2)", status)) {
ffi_prep_closure_loc(cb->closure, &cb->cif, dispatch_callback, cb,
cb->x_closure);
#ifdef DLL_FPTRS
// Find an available function pointer and assign it
if (in_dll) {
for (i=0;i < DLL_FPTRS;i++) {
if (fn[i] == NULL) {
fn[i] = cb->x_closure;
cb->x_closure = dll_fptrs[i];
break;
}
}
if (i == DLL_FPTRS) {
throw_type = EOutOfMemory;
throw_msg = "No more DLL callback slots available";
goto failure_cleanup;
}
}
#endif
return cb;
}
}
failure_cleanup:
free_callback(env, cb);
if (throw_type) {
throwByName(env, throw_type, throw_msg);
}
return NULL;
}
static VALUE
variadic_invoke(VALUE self, VALUE parameterTypes, VALUE parameterValues)
{
VariadicInvoker* invoker;
FFIStorage* params;
void* retval;
ffi_cif cif;
void** ffiValues;
ffi_type** ffiParamTypes;
ffi_type* ffiReturnType;
Type** paramTypes;
VALUE* argv;
int paramCount = 0, fixedCount = 0, i;
ffi_status ffiStatus;
rbffi_frame_t frame = { 0 };
Check_Type(parameterTypes, T_ARRAY);
Check_Type(parameterValues, T_ARRAY);
Data_Get_Struct(self, VariadicInvoker, invoker);
paramCount = (int) RARRAY_LEN(parameterTypes);
paramTypes = ALLOCA_N(Type *, paramCount);
ffiParamTypes = ALLOCA_N(ffi_type *, paramCount);
params = ALLOCA_N(FFIStorage, paramCount);
ffiValues = ALLOCA_N(void*, paramCount);
argv = ALLOCA_N(VALUE, paramCount);
retval = alloca(MAX(invoker->returnType->ffiType->size, FFI_SIZEOF_ARG));
for (i = 0; i < paramCount; ++i) {
VALUE rbType = rb_ary_entry(parameterTypes, i);
if (!rb_obj_is_kind_of(rbType, rbffi_TypeClass)) {
rb_raise(rb_eTypeError, "wrong type. Expected (FFI::Type)");
}
Data_Get_Struct(rbType, Type, paramTypes[i]);
switch (paramTypes[i]->nativeType) {
case NATIVE_INT8:
case NATIVE_INT16:
case NATIVE_INT32:
rbType = rb_const_get(rbffi_TypeClass, rb_intern("INT32"));
Data_Get_Struct(rbType, Type, paramTypes[i]);
break;
case NATIVE_UINT8:
case NATIVE_UINT16:
case NATIVE_UINT32:
rbType = rb_const_get(rbffi_TypeClass, rb_intern("UINT32"));
Data_Get_Struct(rbType, Type, paramTypes[i]);
break;
case NATIVE_FLOAT32:
rbType = rb_const_get(rbffi_TypeClass, rb_intern("DOUBLE"));
Data_Get_Struct(rbType, Type, paramTypes[i]);
break;
default:
break;
}
ffiParamTypes[i] = paramTypes[i]->ffiType;
if (ffiParamTypes[i] == NULL) {
rb_raise(rb_eArgError, "Invalid parameter type #%x", paramTypes[i]->nativeType);
}
argv[i] = rb_ary_entry(parameterValues, i);
}
ffiReturnType = invoker->returnType->ffiType;
if (ffiReturnType == NULL) {
rb_raise(rb_eArgError, "Invalid return type");
}
/*Get the number of fixed args from @fixed array*/
fixedCount = RARRAY_LEN(rb_iv_get(self, "@fixed"));
#ifdef HAVE_FFI_PREP_CIF_VAR
ffiStatus = ffi_prep_cif_var(&cif, invoker->abi, fixedCount, paramCount, ffiReturnType, ffiParamTypes);
#else
ffiStatus = ffi_prep_cif(&cif, invoker->abi, paramCount, ffiReturnType, ffiParamTypes);
#endif
switch (ffiStatus) {
case FFI_BAD_ABI:
rb_raise(rb_eArgError, "Invalid ABI specified");
case FFI_BAD_TYPEDEF:
rb_raise(rb_eArgError, "Invalid argument type specified");
case FFI_OK:
break;
default:
rb_raise(rb_eArgError, "Unknown FFI error");
}
rbffi_SetupCallParams(paramCount, argv, -1, paramTypes, params,
ffiValues, NULL, 0, invoker->rbEnums);
rbffi_frame_push(&frame);
ffi_call(&cif, FFI_FN(invoker->function), retval, ffiValues);
rbffi_frame_pop(&frame);
rbffi_save_errno();
if (RTEST(frame.exc) && frame.exc != Qnil) {
rb_exc_raise(frame.exc);
}
return rbffi_NativeValue_ToRuby(invoker->returnType, invoker->rbReturnType, retval);
}
static VALUE
variadic_invoke(VALUE self, VALUE parameterTypes, VALUE parameterValues)
{
VariadicInvoker* invoker;
FFIStorage* params;
void* retval;
ffi_cif cif;
void** ffiValues;
ffi_type** ffiParamTypes;
ffi_type* ffiReturnType;
Type** paramTypes;
VALUE* argv;
int paramCount = 0, fixedCount = 0, i;
ffi_status ffiStatus;
rbffi_frame_t frame = { 0 };
Check_Type(parameterTypes, T_ARRAY);
Check_Type(parameterValues, T_ARRAY);
Data_Get_Struct(self, VariadicInvoker, invoker);
paramCount = (int) RARRAY_LEN(parameterTypes);
paramTypes = ALLOCA_N(Type *, paramCount);
ffiParamTypes = ALLOCA_N(ffi_type *, paramCount);
params = ALLOCA_N(FFIStorage, paramCount);
ffiValues = ALLOCA_N(void*, paramCount);
argv = ALLOCA_N(VALUE, paramCount);
retval = alloca(MAX(invoker->returnType->ffiType->size, FFI_SIZEOF_ARG));
for (i = 0; i < paramCount; ++i) {
VALUE rbType = rb_ary_entry(parameterTypes, i);
if (!rb_obj_is_kind_of(rbType, rbffi_TypeClass)) {
rb_raise(rb_eTypeError, "wrong type. Expected (FFI::Type)");
}
Data_Get_Struct(rbType, Type, paramTypes[i]);
switch (paramTypes[i]->nativeType) {
case NATIVE_INT8:
case NATIVE_INT16:
case NATIVE_INT32:
rbType = rb_const_get(rbffi_TypeClass, rb_intern("INT32"));
Data_Get_Struct(rbType, Type, paramTypes[i]);
break;
case NATIVE_UINT8:
case NATIVE_UINT16:
case NATIVE_UINT32:
rbType = rb_const_get(rbffi_TypeClass, rb_intern("UINT32"));
Data_Get_Struct(rbType, Type, paramTypes[i]);
break;
case NATIVE_FLOAT32:
rbType = rb_const_get(rbffi_TypeClass, rb_intern("DOUBLE"));
Data_Get_Struct(rbType, Type, paramTypes[i]);
break;
default:
break;
}
ffiParamTypes[i] = paramTypes[i]->ffiType;
if (ffiParamTypes[i] == NULL) {
rb_raise(rb_eArgError, "Invalid parameter type #%x", paramTypes[i]->nativeType);
}
argv[i] = rb_ary_entry(parameterValues, i);
}
ffiReturnType = invoker->returnType->ffiType;
if (ffiReturnType == NULL) {
rb_raise(rb_eArgError, "Invalid return type");
}
/*Get the number of fixed args from @fixed array*/
fixedCount = RARRAY_LEN(rb_iv_get(self, "@fixed"));
#ifdef HAVE_FFI_PREP_CIF_VAR
ffiStatus = ffi_prep_cif_var(&cif, invoker->abi, fixedCount, paramCount, ffiReturnType, ffiParamTypes);
#else
ffiStatus = ffi_prep_cif(&cif, invoker->abi, paramCount, ffiReturnType, ffiParamTypes);
#endif
switch (ffiStatus) {
case FFI_BAD_ABI:
rb_raise(rb_eArgError, "Invalid ABI specified");
case FFI_BAD_TYPEDEF:
rb_raise(rb_eArgError, "Invalid argument type specified");
case FFI_OK:
break;
default:
rb_raise(rb_eArgError, "Unknown FFI error");
}
rbffi_SetupCallParams(paramCount, argv, -1, paramTypes, params,
ffiValues, NULL, 0, invoker->rbEnums);
rbffi_frame_push(&frame);
#ifdef HAVE_RB_THREAD_CALL_WITHOUT_GVL
/* In Call.c, blocking: true is supported on older ruby variants
* without rb_thread_call_without_gvl by allocating on the heap instead
* of the stack. Since this functionality is being added later,
* we’re skipping support for old rubies here. */
if(unlikely(invoker->blocking)) {
rbffi_blocking_call_t* bc;
bc = ALLOCA_N(rbffi_blocking_call_t, 1);
bc->retval = retval;
bc->function = invoker->function;
bc->ffiValues = ffiValues;
bc->params = params;
bc->frame = &frame;
bc->cif = cif;
rb_rescue2(rbffi_do_blocking_call, (VALUE) bc, rbffi_save_frame_exception, (VALUE) &frame, rb_eException, (VALUE) 0);
} else {
ffi_call(&cif, FFI_FN(invoker->function), retval, ffiValues);
}
#else
ffi_call(&cif, FFI_FN(invoker->function), retval, ffiValues);
#endif
rbffi_frame_pop(&frame);
rbffi_save_errno();
if (RTEST(frame.exc) && frame.exc != Qnil) {
rb_exc_raise(frame.exc);
}
return rbffi_NativeValue_ToRuby(invoker->returnType, invoker->rbReturnType, retval);
}
int main (void)
{
ffi_cif cif;
ffi_type *arg_types[5];
void *values[5];
double doubles[5];
unsigned int firstarg;
double resfp;
/* First test, pass float_va_fn(0,2.0) - note there are no actual
* variadic parameters, but it's declared variadic so the ABI may be
* different. */
/* Call it statically and then via ffi */
resfp=float_va_fn(0,2.0);
// { dg-output "0: 2.0 : total: 2.0" }
printf("compiled: %.1lf\n", resfp);
// { dg-output "\ncompiled: 2.0" }
arg_types[0] = &ffi_type_uint;
arg_types[1] = &ffi_type_double;
arg_types[2] = NULL;
CHECK(ffi_prep_cif_var(&cif, FFI_DEFAULT_ABI, 2, 2,
&ffi_type_double, arg_types) == FFI_OK);
firstarg = 0;
doubles[0] = 2.0;
values[0] = &firstarg;
values[1] = &doubles[0];
ffi_call(&cif, FFI_FN(float_va_fn), &resfp, values);
// { dg-output "\n0: 2.0 : total: 2.0" }
printf("ffi: %.1lf\n", resfp);
// { dg-output "\nffi: 2.0" }
/* Second test, float_va_fn(2,2.0,3.0,4.0), now with variadic params */
/* Call it statically and then via ffi */
resfp=float_va_fn(2,2.0,3.0,4.0);
// { dg-output "\n2: 2.0 : 0:3.0 1:4.0 total: 11.0" }
printf("compiled: %.1lf\n", resfp);
// { dg-output "\ncompiled: 11.0" }
arg_types[0] = &ffi_type_uint;
arg_types[1] = &ffi_type_double;
arg_types[2] = &ffi_type_double;
arg_types[3] = &ffi_type_double;
arg_types[4] = NULL;
CHECK(ffi_prep_cif_var(&cif, FFI_DEFAULT_ABI, 2, 4,
&ffi_type_double, arg_types) == FFI_OK);
firstarg = 2;
doubles[0] = 2.0;
doubles[1] = 3.0;
doubles[2] = 4.0;
values[0] = &firstarg;
values[1] = &doubles[0];
values[2] = &doubles[1];
values[3] = &doubles[2];
ffi_call(&cif, FFI_FN(float_va_fn), &resfp, values);
// { dg-output "\n2: 2.0 : 0:3.0 1:4.0 total: 11.0" }
printf("ffi: %.1lf\n", resfp);
// { dg-output "\nffi: 11.0" }
exit(0);
}