#include <string.h>
#include "libguile/_scm.h"
+#include "libguile/bytevectors.h"
#include "libguile/foreign.h"
\f
SCM_SYMBOL (sym_uint64, "uint64");
SCM_SYMBOL (sym_int64, "int64");
+static SCM foreign_weak_refs = SCM_BOOL_F;
+
+static void
+register_weak_reference (SCM from, SCM to)
+{
+ scm_hashq_set_x (foreign_weak_refs, from, to);
+}
+
static void
foreign_finalizer_trampoline (GC_PTR ptr, GC_PTR data)
{
return ret;
}
-static void
-keepalive (GC_PTR obj, GC_PTR data)
-{
-}
-
-SCM_DEFINE (scm_foreign_ref, "foreign-ref", 1, 3, 0,
- (SCM foreign, SCM type, SCM offset, SCM len),
+SCM_DEFINE (scm_foreign_ref, "foreign-ref", 1, 0, 0,
+ (SCM foreign),
"Reference the foreign value wrapped by @var{foreign}.\n\n"
- "The value will be referenced according to its type.\n"
- "If and only if the type of the foreign value is @code{void},\n"
- "this function accepts optional @var{type} and @var{offset}\n"
- "arguments, indicating that the pointer wrapped by\n"
- "@var{foreign} should be incremented by @var{offset} bytes,\n"
- "and treated as a pointer to a value of the given @var{type}.\n"
- "@var{offset} defaults to 0.\n\n"
- "If @var{type} itself is @code{void}, @var{len} will be used\n"
- "to specify the size of the resulting @code{void} pointer.")
+ "The value will be referenced according to its type.")
#define FUNC_NAME s_scm_foreign_ref
{
scm_t_foreign_type ftype;
SCM_VALIDATE_FOREIGN (1, foreign);
ptr = SCM_FOREIGN_POINTER (foreign, scm_t_uint8);
-
ftype = SCM_FOREIGN_TYPE (foreign);
- if (ftype == SCM_FOREIGN_TYPE_VOID)
- {
- if (SCM_UNBNDP (type))
- scm_error_num_args_subr (FUNC_NAME);
- ftype = scm_to_unsigned_integer (type, 0, SCM_FOREIGN_TYPE_LAST);
- if (!SCM_UNBNDP (offset))
- ptr += scm_to_ssize_t (offset);
- }
- else
- {
- if (!SCM_UNBNDP (type))
- scm_error_num_args_subr (FUNC_NAME);
- }
/* FIXME: is there a window in which we can see ptr but not foreign? */
+ /* FIXME: accessing unaligned pointers */
switch (ftype)
{
+ case SCM_FOREIGN_TYPE_VOID:
+ return scm_from_ulong ((unsigned long)ptr);
case SCM_FOREIGN_TYPE_FLOAT:
return scm_from_double (*(float*)ptr);
case SCM_FOREIGN_TYPE_DOUBLE:
return scm_from_uint64 (*(scm_t_uint64*)ptr);
case SCM_FOREIGN_TYPE_INT64:
return scm_from_int64 (*(scm_t_int64*)ptr);
- case SCM_FOREIGN_TYPE_VOID:
- /* seems we're making a new pointer, woo */
- {
- GC_finalization_proc prev_finalizer;
- GC_PTR prev_finalizer_data;
- SCM ret = scm_take_foreign_pointer
- (ftype, ptr, SCM_UNBNDP (len) ? 0 : scm_to_size_t (len), NULL);
- /* while the kid is alive, keep the parent alive */
- if (SCM_FOREIGN_HAS_FINALIZER (foreign))
- GC_REGISTER_FINALIZER_NO_ORDER (SCM2PTR (ret), keepalive, foreign,
- &prev_finalizer, &prev_finalizer_data);
- return ret;
- }
default:
abort ();
}
}
#undef FUNC_NAME
-SCM_DEFINE (scm_foreign_set_x, "foreign-set!", 2, 2, 0,
- (SCM foreign, SCM val, SCM type, SCM offset),
+SCM_DEFINE (scm_foreign_set_x, "foreign-set!", 2, 0, 0,
+ (SCM foreign, SCM val),
"Set the foreign value wrapped by @var{foreign}.\n\n"
- "The value will be set according to its type.\n"
- "If and only if the type of the foreign value is @code{void},\n"
- "this function accepts optional @var{type} and @var{offset}\n"
- "arguments, indicating that the pointer wrapped by\n"
- "@var{foreign} should be incremented by @var{offset} bytes,\n"
- "and treated as a pointer to a value of the given @var{type}.\n"
- "@var{offset} defaults to 0.")
+ "The value will be set according to its type.")
#define FUNC_NAME s_scm_foreign_set_x
{
scm_t_foreign_type ftype;
SCM_VALIDATE_FOREIGN (1, foreign);
ptr = SCM_FOREIGN_POINTER (foreign, scm_t_uint8);
-
ftype = SCM_FOREIGN_TYPE (foreign);
- if (ftype == SCM_FOREIGN_TYPE_VOID)
- {
- if (SCM_UNBNDP (type))
- scm_error_num_args_subr (FUNC_NAME);
- ftype = scm_to_unsigned_integer (type, 0, SCM_FOREIGN_TYPE_LAST);
- if (!SCM_UNBNDP (offset))
- ptr += scm_to_ssize_t (offset);
- }
- else
- {
- if (!SCM_UNBNDP (type))
- scm_error_num_args_subr (FUNC_NAME);
- }
-
+
/* FIXME: is there a window in which we can see ptr but not foreign? */
+ /* FIXME: unaligned access */
switch (ftype)
{
+ case SCM_FOREIGN_TYPE_VOID:
+ SCM_SET_CELL_WORD_1 (foreign, scm_to_ulong (val));
+ break;
case SCM_FOREIGN_TYPE_FLOAT:
*(float*)ptr = scm_to_double (val);
break;
case SCM_FOREIGN_TYPE_INT64:
*(scm_t_int64*)ptr = scm_to_int64 (val);
break;
- case SCM_FOREIGN_TYPE_VOID:
- SCM_VALIDATE_FOREIGN (2, val);
- if (SCM_FOREIGN_HAS_FINALIZER (val))
- /* setting a pointer inside one foreign value to the pointer of another?
- that is asking for trouble */
- scm_wrong_type_arg_msg (FUNC_NAME, 2, val,
- "foreign value without finalizer");
- *(void**)ptr = SCM_FOREIGN_POINTER (val, void*);
- break;
default:
abort ();
}
}
#undef FUNC_NAME
+SCM_DEFINE (scm_foreign_to_bytevector, "foreign->bytevector", 1, 3, 0,
+ (SCM foreign, SCM uvec_type, SCM offset, SCM len),
+ "Return a bytevector aliasing the memory pointed to by\n"
+ "@var{foreign}.\n\n"
+ "@var{foreign} must be a void pointer, a foreign whose type is\n"
+ "@var{void}. By default, the resulting bytevector will alias\n"
+ "all of the memory pointed to by @var{foreign}, from beginning\n"
+ "to end, treated as a @code{vu8} array.\n\n"
+ "The user may specify an alternate default interpretation for\n"
+ "the memory by passing the @var{uvec_type} argument, to indicate\n"
+ "that the memory is an array of elements of that type.\n"
+ "@var{uvec_type} should be something that\n"
+ "@code{uniform-vector-element-type} would return, like @code{f32}\n"
+ "or @code{s16}.\n\n"
+ "Users may also specify that the bytevector should only alias a\n"
+ "subset of the memory, by specifying @var{offset} and @var{len}\n"
+ "arguments.")
+#define FUNC_NAME s_scm_foreign_to_bytevector
+{
+ SCM ret;
+ scm_t_int8 *ptr;
+ size_t boffset, blen;
+ scm_t_array_element_type btype;
+
+ SCM_VALIDATE_FOREIGN_TYPED (1, foreign, VOID);
+ ptr = SCM_FOREIGN_POINTER (foreign, scm_t_int8);
+
+ if (SCM_UNBNDP (uvec_type))
+ btype = SCM_ARRAY_ELEMENT_TYPE_VU8;
+ else
+ {
+ int i;
+ for (i = 0; i <= SCM_ARRAY_ELEMENT_TYPE_LAST; i++)
+ if (scm_is_eq (uvec_type, scm_i_array_element_types[i]))
+ break;
+ switch (i)
+ {
+ case SCM_ARRAY_ELEMENT_TYPE_VU8:
+ case SCM_ARRAY_ELEMENT_TYPE_U8:
+ case SCM_ARRAY_ELEMENT_TYPE_S8:
+ case SCM_ARRAY_ELEMENT_TYPE_U16:
+ case SCM_ARRAY_ELEMENT_TYPE_S16:
+ case SCM_ARRAY_ELEMENT_TYPE_U32:
+ case SCM_ARRAY_ELEMENT_TYPE_S32:
+ case SCM_ARRAY_ELEMENT_TYPE_U64:
+ case SCM_ARRAY_ELEMENT_TYPE_S64:
+ case SCM_ARRAY_ELEMENT_TYPE_F32:
+ case SCM_ARRAY_ELEMENT_TYPE_F64:
+ case SCM_ARRAY_ELEMENT_TYPE_C32:
+ case SCM_ARRAY_ELEMENT_TYPE_C64:
+ btype = i;
+ break;
+ default:
+ scm_wrong_type_arg_msg (FUNC_NAME, SCM_ARG1, uvec_type,
+ "uniform vector type");
+ }
+ }
+
+ if (SCM_UNBNDP (offset))
+ boffset = 0;
+ else if (SCM_FOREIGN_LEN (foreign))
+ boffset = scm_to_unsigned_integer (offset, 0,
+ SCM_FOREIGN_LEN (foreign) - 1);
+ else
+ boffset = scm_to_size_t (offset);
+
+ if (SCM_UNBNDP (len))
+ {
+ if (SCM_FOREIGN_LEN (foreign))
+ blen = SCM_FOREIGN_LEN (foreign) - boffset;
+ else
+ scm_misc_error (FUNC_NAME,
+ "length needed to convert foreign pointer to bytevector",
+ SCM_EOL);
+ }
+ else
+ {
+ if (SCM_FOREIGN_LEN (foreign))
+ blen = scm_to_unsigned_integer (len, 0,
+ SCM_FOREIGN_LEN (foreign) - boffset);
+ else
+ blen = scm_to_size_t (len);
+ }
+
+ ret = scm_c_take_typed_bytevector (ptr + boffset, blen, btype);
+ register_weak_reference (ret, foreign);
+ return ret;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_bytevector_to_foreign, "bytevector->foreign", 1, 2, 0,
+ (SCM bv, SCM offset, SCM len),
+ "Return a foreign pointer aliasing the memory pointed to by\n"
+ "@var{bv}.\n\n"
+ "The resulting foreign will be a void pointer, a foreign whose\n"
+ "type is @code{void}. By default it will alias all of the\n"
+ "memory pointed to by @var{bv}, from beginning to end.\n\n"
+ "Users may explicily specify that the foreign should only alias a\n"
+ "subset of the memory, by specifying @var{offset} and @var{len}\n"
+ "arguments.")
+#define FUNC_NAME s_scm_bytevector_to_foreign
+{
+ SCM ret;
+ scm_t_int8 *ptr;
+ size_t boffset, blen;
+
+ SCM_VALIDATE_BYTEVECTOR (1, bv);
+ ptr = SCM_BYTEVECTOR_CONTENTS (bv);
+
+ if (SCM_UNBNDP (offset))
+ boffset = 0;
+ else
+ boffset = scm_to_unsigned_integer (offset, 0,
+ SCM_BYTEVECTOR_LENGTH (bv) - 1);
+
+ if (SCM_UNBNDP (len))
+ blen = SCM_BYTEVECTOR_LENGTH (bv) - boffset;
+ else
+ blen = scm_to_unsigned_integer (len, 0,
+ SCM_BYTEVECTOR_LENGTH (bv) - boffset);
+
+ ret = scm_take_foreign_pointer (SCM_FOREIGN_TYPE_VOID, ptr + boffset, blen,
+ NULL);
+ register_weak_reference (ret, bv);
+ return ret;
+}
+#undef FUNC_NAME
+
void
scm_i_foreign_print (SCM foreign, SCM port, scm_print_state *pstate)
{
{
case SCM_FOREIGN_TYPE_FLOAT:
scm_puts ("float ", port);
- scm_display (scm_foreign_ref (foreign, SCM_UNDEFINED, SCM_UNDEFINED,
- SCM_UNDEFINED),
- port);
break;
case SCM_FOREIGN_TYPE_DOUBLE:
scm_puts ("double ", port);
- scm_display (scm_foreign_ref (foreign, SCM_UNDEFINED, SCM_UNDEFINED,
- SCM_UNDEFINED),
- port);
break;
case SCM_FOREIGN_TYPE_UINT8:
scm_puts ("uint8 ", port);
- scm_display (scm_foreign_ref (foreign, SCM_UNDEFINED, SCM_UNDEFINED,
- SCM_UNDEFINED),
- port);
break;
case SCM_FOREIGN_TYPE_INT8:
scm_puts ("int8 ", port);
- scm_display (scm_foreign_ref (foreign, SCM_UNDEFINED, SCM_UNDEFINED,
- SCM_UNDEFINED),
- port);
break;
case SCM_FOREIGN_TYPE_UINT16:
scm_puts ("uint16 ", port);
- scm_display (scm_foreign_ref (foreign, SCM_UNDEFINED, SCM_UNDEFINED,
- SCM_UNDEFINED),
- port);
break;
case SCM_FOREIGN_TYPE_INT16:
scm_puts ("int16 ", port);
- scm_display (scm_foreign_ref (foreign, SCM_UNDEFINED, SCM_UNDEFINED,
- SCM_UNDEFINED),
- port);
break;
case SCM_FOREIGN_TYPE_UINT32:
scm_puts ("uint32 ", port);
- scm_display (scm_foreign_ref (foreign, SCM_UNDEFINED, SCM_UNDEFINED,
- SCM_UNDEFINED),
- port);
break;
case SCM_FOREIGN_TYPE_INT32:
scm_puts ("int32 ", port);
- scm_display (scm_foreign_ref (foreign, SCM_UNDEFINED, SCM_UNDEFINED,
- SCM_UNDEFINED),
- port);
break;
case SCM_FOREIGN_TYPE_UINT64:
scm_puts ("uint64 ", port);
- scm_display (scm_foreign_ref (foreign, SCM_UNDEFINED, SCM_UNDEFINED,
- SCM_UNDEFINED),
- port);
break;
case SCM_FOREIGN_TYPE_INT64:
scm_puts ("int64 ", port);
- scm_display (scm_foreign_ref (foreign, SCM_UNDEFINED, SCM_UNDEFINED,
- SCM_UNDEFINED),
- port);
break;
case SCM_FOREIGN_TYPE_VOID:
- scm_puts ("pointer 0x", port);
- scm_uintprint ((scm_t_bits)SCM_FOREIGN_POINTER (foreign, void), 16, port);
+ scm_puts ("pointer ", port);
break;
default:
abort ();
}
+ scm_display (scm_foreign_ref (foreign), port);
scm_putc ('>', port);
}
scm_c_register_extension ("libguile", "scm_init_foreign",
(scm_t_extension_init_func)scm_init_foreign,
NULL);
+ foreign_weak_refs = scm_make_weak_key_hash_table (SCM_UNDEFINED);
}
/*
HCoop / bpt / guile.git / commitdiff