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ruby--ruby/ext/dl/cfunc.c
tenderlove 5de564634d * ext/dl/cfunc.c (**) updating documentation 
* test/dl/test_cfunc.rb (test_ptr=, test_ptr) testing the pointer
  accessor methods on CFunc

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25686 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2009-11-08 00:21:41 +00:00

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/* -*- C -*-
* $Id$
*/
#include <ruby.h>
#include <errno.h>
#include "dl.h"
VALUE rb_cDLCFunc;
static ID id_last_error;
static VALUE
rb_dl_get_last_error(VALUE self)
{
return rb_thread_local_aref(rb_thread_current(), id_last_error);
}
static VALUE
rb_dl_set_last_error(VALUE self, VALUE val)
{
rb_thread_local_aset(rb_thread_current(), id_last_error, val);
return Qnil;
}
#if defined(HAVE_WINDOWS_H)
#include <windows.h>
static ID id_win32_last_error;
static VALUE
rb_dl_get_win32_last_error(VALUE self)
{
return rb_thread_local_aref(rb_thread_current(), id_win32_last_error);
}
static VALUE
rb_dl_set_win32_last_error(VALUE self, VALUE val)
{
rb_thread_local_aset(rb_thread_current(), id_win32_last_error, val);
return Qnil;
}
#endif
static void
dlcfunc_free(void *ptr)
{
struct cfunc_data *data = ptr;
if( data->name ){
xfree(data->name);
}
xfree(data);
}
static size_t
dlcfunc_memsize(const void *ptr)
{
const struct cfunc_data *data = ptr;
size_t size = 0;
if( data ){
size += sizeof(*data);
if( data->name ){
size += strlen(data->name) + 1;
}
}
return size;
}
const rb_data_type_t dlcfunc_data_type = {
"dl/cfunc",
0, dlcfunc_free, dlcfunc_memsize,
};
VALUE
rb_dlcfunc_new(void (*func)(), int type, const char *name, ID calltype)
{
VALUE val;
struct cfunc_data *data;
rb_secure(4);
if( func ){
val = TypedData_Make_Struct(rb_cDLCFunc, struct cfunc_data, &dlcfunc_data_type, data);
data->ptr = func;
data->name = name ? strdup(name) : NULL;
data->type = type;
data->calltype = calltype;
}
else{
val = Qnil;
}
return val;
}
void *
rb_dlcfunc2ptr(VALUE val)
{
struct cfunc_data *data;
void * func;
if( rb_typeddata_is_kind_of(val, &dlcfunc_data_type) ){
data = DATA_PTR(val);
func = data->ptr;
}
else if( val == Qnil ){
func = NULL;
}
else{
rb_raise(rb_eTypeError, "DL::CFunc was expected");
}
return func;
}
static VALUE
rb_dlcfunc_s_allocate(VALUE klass)
{
VALUE obj;
struct cfunc_data *data;
obj = TypedData_Make_Struct(klass, struct cfunc_data, &dlcfunc_data_type, data);
data->ptr = 0;
data->name = 0;
data->type = 0;
data->calltype = CFUNC_CDECL;
return obj;
}
int
rb_dlcfunc_kind_p(VALUE func)
{
return rb_typeddata_is_kind_of(func, &dlcfunc_data_type);
}
/*
* call-seq:
* DL::CFunc.new(address, type=DL::TYPE_VOID, name=nil, calltype=:cdecl)
*
* Create a new function that points to +address+ with an optional return type
* of +type+, a name of +name+ and a calltype of +calltype+.
*/
static VALUE
rb_dlcfunc_initialize(int argc, VALUE argv[], VALUE self)
{
VALUE addr, name, type, calltype;
struct cfunc_data *data;
void *saddr;
const char *sname;
rb_scan_args(argc, argv, "13", &addr, &type, &name, &calltype);
saddr = (void*)(NUM2PTR(rb_Integer(addr)));
sname = NIL_P(name) ? NULL : StringValuePtr(name);
TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, data);
if( data->name ) xfree(data->name);
data->ptr = saddr;
data->name = sname ? strdup(sname) : 0;
data->type = NIL_P(type) ? DLTYPE_VOID : NUM2INT(type);
data->calltype = NIL_P(calltype) ? CFUNC_CDECL : SYM2ID(calltype);
return Qnil;
}
/*
* call-seq:
* name => str
*
* Get the name of this function
*/
static VALUE
rb_dlcfunc_name(VALUE self)
{
struct cfunc_data *cfunc;
TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
return cfunc->name ? rb_tainted_str_new2(cfunc->name) : Qnil;
}
/*
* call-seq:
* cfunc.ctype => num
*
* Get the C function return value type. See DL for a list of constants
* corresponding to this method's return value.
*/
static VALUE
rb_dlcfunc_ctype(VALUE self)
{
struct cfunc_data *cfunc;
TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
return INT2NUM(cfunc->type);
}
/*
* call-seq:
* cfunc.ctype = type
*
* Set the C function return value type to +type+.
*/
static VALUE
rb_dlcfunc_set_ctype(VALUE self, VALUE ctype)
{
struct cfunc_data *cfunc;
TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
cfunc->type = NUM2INT(ctype);
return ctype;
}
/*
* call-seq:
* cfunc.calltype => symbol
*
* Get the call type of this function.
*/
static VALUE
rb_dlcfunc_calltype(VALUE self)
{
struct cfunc_data *cfunc;
TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
return ID2SYM(cfunc->calltype);
}
/*
* call-seq:
* cfunc.calltype = symbol
*
* Set the call type for this function.
*/
static VALUE
rb_dlcfunc_set_calltype(VALUE self, VALUE sym)
{
struct cfunc_data *cfunc;
TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
cfunc->calltype = SYM2ID(sym);
return sym;
}
/*
* call-seq:
* cfunc.ptr
*
* Get the underlying function pointer as a DL::CPtr object.
*/
static VALUE
rb_dlcfunc_ptr(VALUE self)
{
struct cfunc_data *cfunc;
TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
return PTR2NUM(cfunc->ptr);
}
/*
* call-seq:
* cfunc.ptr = pointer
*
* Set the underlying function pointer to a DL::CPtr named +pointer+.
*/
static VALUE
rb_dlcfunc_set_ptr(VALUE self, VALUE addr)
{
struct cfunc_data *cfunc;
TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
cfunc->ptr = NUM2PTR(addr);
return Qnil;
}
/*
* call-seq: inspect
*
* Returns a string formatted with an easily readable representation of the
* internal state of the DL::CFunc
*/
static VALUE
rb_dlcfunc_inspect(VALUE self)
{
VALUE val;
char *str;
int str_size;
struct cfunc_data *cfunc;
TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
str_size = (cfunc->name ? strlen(cfunc->name) : 0) + 100;
str = ruby_xmalloc(str_size);
snprintf(str, str_size - 1,
"#<DL::CFunc:%p ptr=%p type=%d name='%s'>",
cfunc,
cfunc->ptr,
cfunc->type,
cfunc->name ? cfunc->name : "");
val = rb_tainted_str_new2(str);
ruby_xfree(str);
return val;
}
# define DECL_FUNC_CDECL(f,ret,args) ret (FUNC_CDECL(*f))(args)
#ifdef FUNC_STDCALL
# define DECL_FUNC_STDCALL(f,ret,args) ret (FUNC_STDCALL(*f))(args)
#endif
#define CALL_CASE switch( RARRAY_LEN(ary) ){ \
CASE(0); break; \
CASE(1); break; CASE(2); break; CASE(3); break; CASE(4); break; CASE(5); break; \
CASE(6); break; CASE(7); break; CASE(8); break; CASE(9); break; CASE(10);break; \
CASE(11);break; CASE(12);break; CASE(13);break; CASE(14);break; CASE(15);break; \
CASE(16);break; CASE(17);break; CASE(18);break; CASE(19);break; CASE(20);break; \
default: rb_raise(rb_eArgError, "too many arguments"); \
}
/*
* call-seq:
* dlcfunc.call(ary) => some_value
* dlcfunc[ary] => some_value
*
* Calls the function pointer passing in +ary+ as values to the underlying
* C function. The return value depends on the ctype.
*/
static VALUE
rb_dlcfunc_call(VALUE self, VALUE ary)
{
struct cfunc_data *cfunc;
int i;
DLSTACK_TYPE stack[DLSTACK_SIZE];
VALUE result = Qnil;
rb_secure_update(self);
memset(stack, 0, sizeof(DLSTACK_TYPE) * DLSTACK_SIZE);
Check_Type(ary, T_ARRAY);
TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
if( cfunc->ptr == 0 ){
rb_raise(rb_eDLError, "can't call null-function");
return Qnil;
}
for( i = 0; i < RARRAY_LEN(ary); i++ ){
if( i >= DLSTACK_SIZE ){
rb_raise(rb_eDLError, "too many arguments (stack overflow)");
}
rb_check_safe_obj(RARRAY_PTR(ary)[i]);
stack[i] = NUM2LONG(RARRAY_PTR(ary)[i]);
}
/* calltype == CFUNC_CDECL */
if( cfunc->calltype == CFUNC_CDECL
#ifndef FUNC_STDCALL
|| cfunc->calltype == CFUNC_STDCALL
#endif
){
switch( cfunc->type ){
case DLTYPE_VOID:
#define CASE(n) case n: { \
DECL_FUNC_CDECL(f,void,DLSTACK_PROTO##n) = cfunc->ptr; \
f(DLSTACK_ARGS##n(stack)); \
result = Qnil; \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_VOIDP:
#define CASE(n) case n: { \
DECL_FUNC_CDECL(f,void*,DLSTACK_PROTO##n) = cfunc->ptr; \
void * ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = PTR2NUM(ret); \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_CHAR:
#define CASE(n) case n: { \
DECL_FUNC_CDECL(f,char,DLSTACK_PROTO##n) = cfunc->ptr; \
char ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = CHR2FIX(ret); \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_SHORT:
#define CASE(n) case n: { \
DECL_FUNC_CDECL(f,short,DLSTACK_PROTO##n) = cfunc->ptr; \
short ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = INT2NUM((int)ret); \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_INT:
#define CASE(n) case n: { \
DECL_FUNC_CDECL(f,int,DLSTACK_PROTO##n) = cfunc->ptr; \
int ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = INT2NUM(ret); \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_LONG:
#define CASE(n) case n: { \
DECL_FUNC_CDECL(f,long,DLSTACK_PROTO##n) = cfunc->ptr; \
long ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = LONG2NUM(ret); \
}
CALL_CASE;
#undef CASE
break;
#if HAVE_LONG_LONG /* used in ruby.h */
case DLTYPE_LONG_LONG:
#define CASE(n) case n: { \
DECL_FUNC_CDECL(f,LONG_LONG,DLSTACK_PROTO##n) = cfunc->ptr; \
LONG_LONG ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = LL2NUM(ret); \
}
CALL_CASE;
#undef CASE
break;
#endif
case DLTYPE_FLOAT:
#define CASE(n) case n: { \
DECL_FUNC_CDECL(f,float,DLSTACK_PROTO##n) = cfunc->ptr; \
float ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = rb_float_new(ret); \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_DOUBLE:
#define CASE(n) case n: { \
DECL_FUNC_CDECL(f,double,DLSTACK_PROTO##n) = cfunc->ptr; \
double ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = rb_float_new(ret); \
}
CALL_CASE;
#undef CASE
break;
default:
rb_raise(rb_eDLTypeError, "unknown type %d", cfunc->type);
}
}
#ifdef FUNC_STDCALL
else if( cfunc->calltype == CFUNC_STDCALL ){
/* calltype == CFUNC_STDCALL */
switch( cfunc->type ){
case DLTYPE_VOID:
#define CASE(n) case n: { \
DECL_FUNC_STDCALL(f,void,DLSTACK_PROTO##n##_) = cfunc->ptr; \
f(DLSTACK_ARGS##n(stack)); \
result = Qnil; \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_VOIDP:
#define CASE(n) case n: { \
DECL_FUNC_STDCALL(f,void*,DLSTACK_PROTO##n##_) = cfunc->ptr; \
void * ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = PTR2NUM(ret); \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_CHAR:
#define CASE(n) case n: { \
DECL_FUNC_STDCALL(f,char,DLSTACK_PROTO##n##_) = cfunc->ptr; \
char ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = CHR2FIX(ret); \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_SHORT:
#define CASE(n) case n: { \
DECL_FUNC_STDCALL(f,short,DLSTACK_PROTO##n##_) = cfunc->ptr; \
short ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = INT2NUM((int)ret); \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_INT:
#define CASE(n) case n: { \
DECL_FUNC_STDCALL(f,int,DLSTACK_PROTO##n##_) = cfunc->ptr; \
int ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = INT2NUM(ret); \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_LONG:
#define CASE(n) case n: { \
DECL_FUNC_STDCALL(f,long,DLSTACK_PROTO##n##_) = cfunc->ptr; \
long ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = LONG2NUM(ret); \
}
CALL_CASE;
#undef CASE
break;
#if HAVE_LONG_LONG /* used in ruby.h */
case DLTYPE_LONG_LONG:
#define CASE(n) case n: { \
DECL_FUNC_STDCALL(f,LONG_LONG,DLSTACK_PROTO##n##_) = cfunc->ptr; \
LONG_LONG ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = LL2NUM(ret); \
}
CALL_CASE;
#undef CASE
break;
#endif
case DLTYPE_FLOAT:
#define CASE(n) case n: { \
DECL_FUNC_STDCALL(f,float,DLSTACK_PROTO##n##_) = cfunc->ptr; \
float ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = rb_float_new(ret); \
}
CALL_CASE;
#undef CASE
break;
case DLTYPE_DOUBLE:
#define CASE(n) case n: { \
DECL_FUNC_STDCALL(f,double,DLSTACK_PROTO##n##_) = cfunc->ptr; \
double ret; \
ret = f(DLSTACK_ARGS##n(stack)); \
result = rb_float_new(ret); \
}
CALL_CASE;
#undef CASE
break;
default:
rb_raise(rb_eDLTypeError, "unknown type %d", cfunc->type);
}
}
#endif
else{
rb_raise(rb_eDLError,
#ifndef LONG_LONG_VALUE
"unsupported call type: %lx",
#else
"unsupported call type: %llx",
#endif
cfunc->calltype);
}
rb_dl_set_last_error(self, INT2NUM(errno));
#if defined(HAVE_WINDOWS_H)
rb_dl_set_win32_last_error(self, INT2NUM(GetLastError()));
#endif
return result;
}
/*
* call-seq:
* dlfunc.to_i => integer
*
* Returns the memory location of this function pointer as an integer.
*/
static VALUE
rb_dlcfunc_to_i(VALUE self)
{
struct cfunc_data *cfunc;
TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
return PTR2NUM(cfunc->ptr);
}
void
Init_dlcfunc(void)
{
id_last_error = rb_intern("__DL2_LAST_ERROR__");
#if defined(HAVE_WINDOWS_H)
id_win32_last_error = rb_intern("__DL2_WIN32_LAST_ERROR__");
#endif
rb_cDLCFunc = rb_define_class_under(rb_mDL, "CFunc", rb_cObject);
rb_define_alloc_func(rb_cDLCFunc, rb_dlcfunc_s_allocate);
rb_define_module_function(rb_cDLCFunc, "last_error", rb_dl_get_last_error, 0);
#if defined(HAVE_WINDOWS_H)
rb_define_module_function(rb_cDLCFunc, "win32_last_error", rb_dl_get_win32_last_error, 0);
#endif
rb_define_method(rb_cDLCFunc, "initialize", rb_dlcfunc_initialize, -1);
rb_define_method(rb_cDLCFunc, "call", rb_dlcfunc_call, 1);
rb_define_method(rb_cDLCFunc, "[]", rb_dlcfunc_call, 1);
rb_define_method(rb_cDLCFunc, "name", rb_dlcfunc_name, 0);
rb_define_method(rb_cDLCFunc, "ctype", rb_dlcfunc_ctype, 0);
rb_define_method(rb_cDLCFunc, "ctype=", rb_dlcfunc_set_ctype, 1);
rb_define_method(rb_cDLCFunc, "calltype", rb_dlcfunc_calltype, 0);
rb_define_method(rb_cDLCFunc, "calltype=", rb_dlcfunc_set_calltype, 1);
rb_define_method(rb_cDLCFunc, "ptr", rb_dlcfunc_ptr, 0);
rb_define_method(rb_cDLCFunc, "ptr=", rb_dlcfunc_set_ptr, 1);
rb_define_method(rb_cDLCFunc, "inspect", rb_dlcfunc_inspect, 0);
rb_define_method(rb_cDLCFunc, "to_s", rb_dlcfunc_inspect, 0);
rb_define_method(rb_cDLCFunc, "to_i", rb_dlcfunc_to_i, 0);
}
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