diff options
Diffstat (limited to 'ext/dl/method.c')
| -rw-r--r-- | ext/dl/method.c | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/ext/dl/method.c b/ext/dl/method.c new file mode 100644 index 0000000000..8462292d98 --- /dev/null +++ b/ext/dl/method.c @@ -0,0 +1,251 @@ +/* -*- C -*- + * $Id$ + */ + +#include <ruby.h> +#include <errno.h> +#include "dl.h" +#include <dl_conversions.h> + +VALUE rb_cDLMethod; + +typedef union +{ + unsigned char uchar; /* ffi_type_uchar */ + signed char schar; /* ffi_type_schar */ + unsigned short ushort; /* ffi_type_sshort */ + signed short sshort; /* ffi_type_ushort */ + unsigned int uint; /* ffi_type_uint */ + signed int sint; /* ffi_type_sint */ + unsigned long ulong; /* ffi_type_ulong */ + signed long slong; /* ffi_type_slong */ + float ffloat; /* ffi_type_float */ + double ddouble; /* ffi_type_double */ +#if HAVE_LONG_LONG + unsigned LONG_LONG long_long; /* ffi_type_uint64 */ +#endif + void * pointer; /* ffi_type_pointer */ +} dl_generic; + +static void +dlfunction_free(void *p) +{ + ffi_cif *ptr = p; + if (ptr->arg_types) xfree(ptr->arg_types); + xfree(ptr); +} + +static size_t +dlfunction_memsize(const void *p) +{ + /* const */ffi_cif *ptr = (ffi_cif *)p; + size_t size = 0; + + if (ptr) { + size += sizeof(*ptr); + size += ffi_raw_size(ptr); + } + return size; +} + +const rb_data_type_t dlfunction_data_type = { + "dl/method", + 0, dlfunction_free, dlfunction_memsize, +}; + +static VALUE +rb_dlfunc_allocate(VALUE klass) +{ + ffi_cif * cif; + + return TypedData_Make_Struct(klass, ffi_cif, &dlfunction_data_type, cif); +} + +static VALUE +rb_dlfunction_initialize(int argc, VALUE argv[], VALUE self) +{ + ffi_cif * cif; + ffi_type **arg_types; + ffi_status result; + VALUE ptr, args, ret_type, abi; + int i; + + rb_scan_args(argc, argv, "31", &ptr, &args, &ret_type, &abi); + if(NIL_P(abi)) abi = INT2NUM(FFI_DEFAULT_ABI); + + rb_iv_set(self, "@ptr", ptr); + rb_iv_set(self, "@args", args); + rb_iv_set(self, "@return_type", ret_type); + rb_iv_set(self, "@abi", abi); + + TypedData_Get_Struct(self, ffi_cif, &dlfunction_data_type, cif); + + arg_types = xcalloc(RARRAY_LEN(args) + 1, sizeof(ffi_type *)); + + for (i = 0; i < RARRAY_LEN(args); i++) { + int type = NUM2INT(RARRAY_PTR(args)[i]); + arg_types[i] = DL2FFI_TYPE(type); + } + arg_types[RARRAY_LEN(args)] = NULL; + + result = ffi_prep_cif ( + cif, + NUM2INT(abi), + RARRAY_LEN(args), + DL2FFI_TYPE(NUM2INT(ret_type)), + arg_types); + + if (result) + rb_raise(rb_eRuntimeError, "error creating CIF %d", result); + + return self; +} + +static void +dl2generic(int dl_type, VALUE src, dl_generic * dst) +{ + int signed_p = 1; + + if (dl_type < 0) { + dl_type = -1 * dl_type; + signed_p = 0; + } + + switch (dl_type) { + case DLTYPE_VOID: + break; + case DLTYPE_VOIDP: + dst->pointer = NUM2PTR(rb_Integer(src)); + break; + case DLTYPE_CHAR: + case DLTYPE_SHORT: + case DLTYPE_INT: + dst->sint = NUM2INT(src); + break; + case DLTYPE_LONG: + if (signed_p) + dst->slong = NUM2LONG(src); + else + dst->ulong = NUM2LONG(src); + break; +#if HAVE_LONG_LONG + case DLTYPE_LONG_LONG: + dst->long_long = rb_big2ull(src); + break; +#endif + case DLTYPE_FLOAT: + dst->ffloat = (float)NUM2DBL(src); + break; + case DLTYPE_DOUBLE: + dst->ddouble = NUM2DBL(src); + break; + default: + rb_raise(rb_eRuntimeError, "unknown type %d", dl_type); + } +} + +static VALUE +unwrap_ffi(VALUE rettype, dl_generic retval) +{ + int signed_p = 1; + int dl_type = NUM2INT(rettype); + + if (dl_type < 0) { + dl_type = -1 * dl_type; + signed_p = 0; + } + + switch (dl_type) { + case DLTYPE_VOID: + return Qnil; + case DLTYPE_VOIDP: + return rb_dlptr_new((void *)retval.pointer, 0, NULL); + case DLTYPE_CHAR: + case DLTYPE_SHORT: + case DLTYPE_INT: + return INT2NUM(retval.sint); + case DLTYPE_LONG: + if (signed_p) return LONG2NUM(retval.slong); + return ULONG2NUM(retval.ulong); +#if HAVE_LONG_LONG + case DLTYPE_LONG_LONG: + return rb_ll2inum(retval.long_long); + break; +#endif + case DLTYPE_FLOAT: + return rb_float_new(retval.ffloat); + case DLTYPE_DOUBLE: + return rb_float_new(retval.ddouble); + default: + rb_raise(rb_eRuntimeError, "unknown type %d", dl_type); + } +} + +static VALUE +rb_dlfunction_call(int argc, VALUE argv[], VALUE self) +{ + ffi_cif * cif; + dl_generic retval; + dl_generic *generic_args; + void **values; + void * fun_ptr; + VALUE cfunc, types; + int i; + + TypedData_Get_Struct(self, ffi_cif, &dlfunction_data_type, cif); + + values = xcalloc((size_t)argc + 1, (size_t)sizeof(void *)); + generic_args = xcalloc((size_t)argc, (size_t)sizeof(dl_generic)); + + cfunc = rb_iv_get(self, "@ptr"); + types = rb_iv_get(self, "@args"); + + for (i = 0; i < argc; i++) { + VALUE dl_type = RARRAY_PTR(types)[i]; + VALUE src = argv[i]; + + if(NUM2INT(dl_type) == DLTYPE_VOIDP) { + if(NIL_P(src)) { + src = INT2NUM(0); + } else if(rb_cDLCPtr != CLASS_OF(src)) { + src = rb_funcall(rb_cDLCPtr, rb_intern("[]"), 1, src); + } + src = rb_Integer(src); + } + + dl2generic(NUM2INT(dl_type), src, &generic_args[i]); + values[i] = (void *)&generic_args[i]; + } + values[argc] = NULL; + + ffi_call(cif, NUM2PTR(rb_Integer(cfunc)), &retval, values); + + rb_dl_set_last_error(self, INT2NUM(errno)); +#if defined(HAVE_WINDOWS_H) + rb_dl_set_win32_last_error(self, INT2NUM(GetLastError())); +#endif + + xfree(values); + xfree(generic_args); + + return unwrap_ffi(rb_iv_get(self, "@return_type"), retval); +} + +void +Init_dlfunction(void) +{ + rb_cDLMethod = rb_define_class_under(rb_mDL, "Method", rb_cObject); + + rb_define_const(rb_cDLMethod, "DEFAULT", INT2NUM(FFI_DEFAULT_ABI)); + +#ifdef FFI_STDCALL + rb_define_const(rb_cDLMethod, "STDCALL", INT2NUM(FFI_STDCALL)); +#endif + + rb_define_alloc_func(rb_cDLMethod, rb_dlfunc_allocate); + + rb_define_method(rb_cDLMethod, "call", rb_dlfunction_call, -1); + + rb_define_method(rb_cDLMethod, "initialize", rb_dlfunction_initialize, -1); +} +/* vim: set noet sw=4 sts=4 */ |