6 /* gets the address of an object representing a C pointer, with the
7 intention of storing the pointer across code which may potentially GC. */
8 char *factor_vm::pinned_alien_offset(cell obj)
10 switch(tagged<object>(obj).type())
14 alien *ptr = untag<alien>(obj);
16 general_error(ERROR_EXPIRED,obj,F,NULL);
17 return pinned_alien_offset(ptr->alien) + ptr->displacement;
22 type_error(ALIEN_TYPE,obj);
23 return NULL; /* can't happen */
28 cell factor_vm::allot_alien(cell delegate_, cell displacement)
30 gc_root<object> delegate(delegate_,this);
31 gc_root<alien> new_alien(allot<alien>(sizeof(alien)),this);
33 if(delegate.type_p(ALIEN_TYPE))
35 tagged<alien> delegate_alien = delegate.as<alien>();
36 displacement += delegate_alien->displacement;
37 new_alien->alien = delegate_alien->alien;
40 new_alien->alien = delegate.value();
42 new_alien->displacement = displacement;
43 new_alien->expired = F;
45 return new_alien.value();
48 /* make an alien pointing at an offset of another alien */
49 inline void factor_vm::primitive_displaced_alien()
52 cell displacement = to_cell(dpop());
54 if(alien == F && displacement == 0)
58 switch(tagged<object>(alien).type())
63 dpush(allot_alien(alien,displacement));
66 type_error(ALIEN_TYPE,alien);
72 PRIMITIVE_FORWARD(displaced_alien)
74 /* address of an object representing a C pointer. Explicitly throw an error
75 if the object is a byte array, as a sanity check. */
76 inline void factor_vm::primitive_alien_address()
78 box_unsigned_cell((cell)pinned_alien_offset(dpop()));
81 PRIMITIVE_FORWARD(alien_address)
83 /* pop ( alien n ) from datastack, return alien's address plus n */
84 void *factor_vm::alien_pointer()
86 fixnum offset = to_fixnum(dpop());
87 return unbox_alien() + offset;
90 /* define words to read/write values at an alien address */
91 #define DEFINE_ALIEN_ACCESSOR(name,type,boxer,to) \
92 PRIMITIVE(alien_##name) \
94 PRIMITIVE_GETVM()->boxer(*(type*)PRIMITIVE_GETVM()->alien_pointer()); \
96 PRIMITIVE(set_alien_##name) \
98 type *ptr = (type *)PRIMITIVE_GETVM()->alien_pointer(); \
99 type value = PRIMITIVE_GETVM()->to(dpop()); \
103 DEFINE_ALIEN_ACCESSOR(signed_cell,fixnum,box_signed_cell,to_fixnum)
104 DEFINE_ALIEN_ACCESSOR(unsigned_cell,cell,box_unsigned_cell,to_cell)
105 DEFINE_ALIEN_ACCESSOR(signed_8,s64,box_signed_8,to_signed_8)
106 DEFINE_ALIEN_ACCESSOR(unsigned_8,u64,box_unsigned_8,to_unsigned_8)
107 DEFINE_ALIEN_ACCESSOR(signed_4,s32,box_signed_4,to_fixnum)
108 DEFINE_ALIEN_ACCESSOR(unsigned_4,u32,box_unsigned_4,to_cell)
109 DEFINE_ALIEN_ACCESSOR(signed_2,s16,box_signed_2,to_fixnum)
110 DEFINE_ALIEN_ACCESSOR(unsigned_2,u16,box_unsigned_2,to_cell)
111 DEFINE_ALIEN_ACCESSOR(signed_1,s8,box_signed_1,to_fixnum)
112 DEFINE_ALIEN_ACCESSOR(unsigned_1,u8,box_unsigned_1,to_cell)
113 DEFINE_ALIEN_ACCESSOR(float,float,box_float,to_float)
114 DEFINE_ALIEN_ACCESSOR(double,double,box_double,to_double)
115 DEFINE_ALIEN_ACCESSOR(cell,void *,box_alien,pinned_alien_offset)
117 /* open a native library and push a handle */
118 inline void factor_vm::primitive_dlopen()
120 gc_root<byte_array> path(dpop(),this);
121 path.untag_check(this);
122 gc_root<dll> library(allot<dll>(sizeof(dll)),this);
123 library->path = path.value();
124 ffi_dlopen(library.untagged());
125 dpush(library.value());
128 PRIMITIVE_FORWARD(dlopen)
130 /* look up a symbol in a native library */
131 inline void factor_vm::primitive_dlsym()
133 gc_root<object> library(dpop(),this);
134 gc_root<byte_array> name(dpop(),this);
135 name.untag_check(this);
137 symbol_char *sym = name->data<symbol_char>();
139 if(library.value() == F)
140 box_alien(ffi_dlsym(NULL,sym));
143 dll *d = untag_check<dll>(library.value());
148 box_alien(ffi_dlsym(d,sym));
152 PRIMITIVE_FORWARD(dlsym)
154 /* close a native library handle */
155 inline void factor_vm::primitive_dlclose()
157 dll *d = untag_check<dll>(dpop());
162 PRIMITIVE_FORWARD(dlclose)
164 inline void factor_vm::primitive_dll_validp()
166 cell library = dpop();
170 dpush(untag_check<dll>(library)->dll == NULL ? F : T);
173 PRIMITIVE_FORWARD(dll_validp)
175 /* gets the address of an object representing a C pointer */
176 char *factor_vm::alien_offset(cell obj)
178 switch(tagged<object>(obj).type())
180 case BYTE_ARRAY_TYPE:
181 return untag<byte_array>(obj)->data<char>();
184 alien *ptr = untag<alien>(obj);
185 if(ptr->expired != F)
186 general_error(ERROR_EXPIRED,obj,F,NULL);
187 return alien_offset(ptr->alien) + ptr->displacement;
192 type_error(ALIEN_TYPE,obj);
193 return NULL; /* can't happen */
197 VM_C_API char *alien_offset(cell obj, factor_vm *myvm)
200 return VM_PTR->alien_offset(obj);
203 /* pop an object representing a C pointer */
204 char *factor_vm::unbox_alien()
206 return alien_offset(dpop());
209 VM_C_API char *unbox_alien(factor_vm *myvm)
212 return VM_PTR->unbox_alien();
215 /* make an alien and push */
216 void factor_vm::box_alien(void *ptr)
221 dpush(allot_alien(F,(cell)ptr));
224 VM_C_API void box_alien(void *ptr, factor_vm *myvm)
227 return VM_PTR->box_alien(ptr);
230 /* for FFI calls passing structs by value */
231 void factor_vm::to_value_struct(cell src, void *dest, cell size)
233 memcpy(dest,alien_offset(src),size);
236 VM_C_API void to_value_struct(cell src, void *dest, cell size, factor_vm *myvm)
239 return VM_PTR->to_value_struct(src,dest,size);
242 /* for FFI callbacks receiving structs by value */
243 void factor_vm::box_value_struct(void *src, cell size)
245 byte_array *bytes = allot_byte_array(size);
246 memcpy(bytes->data<void>(),src,size);
247 dpush(tag<byte_array>(bytes));
250 VM_C_API void box_value_struct(void *src, cell size,factor_vm *myvm)
253 return VM_PTR->box_value_struct(src,size);
256 /* On some x86 OSes, structs <= 8 bytes are returned in registers. */
257 void factor_vm::box_small_struct(cell x, cell y, cell size)
262 box_value_struct(data,size);
265 VM_C_API void box_small_struct(cell x, cell y, cell size, factor_vm *myvm)
268 return VM_PTR->box_small_struct(x,y,size);
271 /* On OS X/PPC, complex numbers are returned in registers. */
272 void factor_vm::box_medium_struct(cell x1, cell x2, cell x3, cell x4, cell size)
279 box_value_struct(data,size);
282 VM_C_API void box_medium_struct(cell x1, cell x2, cell x3, cell x4, cell size, factor_vm *myvm)
285 return VM_PTR->box_medium_struct(x1, x2, x3, x4, size);
288 inline void factor_vm::primitive_vm_ptr()
293 PRIMITIVE_FORWARD(vm_ptr)