2 * allocation routines for C code. For allocation done by Lisp look
3 * instead at src/compiler/target/alloc.lisp and .../macros.lisp
7 * This software is part of the SBCL system. See the README file for
10 * This software is derived from the CMU CL system, which was
11 * written at Carnegie Mellon University and released into the
12 * public domain. The software is in the public domain and is
13 * provided with absolutely no warranty. See the COPYING and CREDITS
14 * files for more information.
27 #include "genesis/vector.h"
28 #include "genesis/cons.h"
29 #include "genesis/bignum.h"
30 #include "genesis/sap.h"
32 #define ALIGNED_SIZE(n) (n+LOWTAG_MASK) & ~LOWTAG_MASK
34 #if defined LISP_FEATURE_GENCGC
35 extern lispobj *alloc(int bytes);
40 struct thread *th=arch_os_get_current_thread();
41 /* FIXME: OOAO violation: see arch_pseudo_* */
42 SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(0),th);
43 SetSymbolValue(PSEUDO_ATOMIC_ATOMIC, make_fixnum(1),th);
45 SetSymbolValue(PSEUDO_ATOMIC_ATOMIC, make_fixnum(0),th);
46 if (fixnum_value(SymbolValue(PSEUDO_ATOMIC_INTERRUPTED,th)))
47 /* even if we gc at this point, the new allocation will be
48 * protected from being moved, because result is on the c stack
50 do_pending_interrupt();
56 #define GET_FREE_POINTER() dynamic_space_free_pointer
57 #define SET_FREE_POINTER(new_value) \
58 (dynamic_space_free_pointer = (new_value))
59 #define GET_GC_TRIGGER() current_auto_gc_trigger
60 #define SET_GC_TRIGGER(new_value) \
61 clear_auto_gc_trigger(); set_auto_gc_trigger(new_value);
63 /* FIXME: this is not pseudo atomic at all, but is called only from
64 * interrupt safe places like interrupt handlers. MG - 2005-08-09 */
70 /* Round to dual word boundary. */
71 bytes = (bytes + LOWTAG_MASK) & ~LOWTAG_MASK;
73 result = (char *)GET_FREE_POINTER();
75 SET_FREE_POINTER((lispobj *)(result + bytes));
77 if (GET_GC_TRIGGER() && GET_FREE_POINTER() > GET_GC_TRIGGER()) {
78 SET_GC_TRIGGER((char *)GET_FREE_POINTER()
79 - (char *)current_dynamic_space);
81 return (lispobj *) result;
87 alloc_unboxed(int type, int words)
91 result = pa_alloc(ALIGNED_SIZE((1 + words) * sizeof(lispobj)));
92 *result = (lispobj) (words << N_WIDETAG_BITS) | type;
97 alloc_vector(int type, int length, int size)
99 struct vector *result;
101 result = (struct vector *)
102 pa_alloc(ALIGNED_SIZE((2 + (length*size + 31) / 32) * sizeof(lispobj)));
104 result->header = type;
105 result->length = make_fixnum(length);
107 return make_lispobj(result,OTHER_POINTER_LOWTAG);
111 alloc_cons(lispobj car, lispobj cdr)
113 struct cons *ptr = (struct cons *)pa_alloc(ALIGNED_SIZE(sizeof(struct cons)));
118 return make_lispobj(ptr, LIST_POINTER_LOWTAG);
126 if (-0x20000000 < n && n < 0x20000000)
127 return make_fixnum(n);
129 ptr = (struct bignum *)alloc_unboxed(BIGNUM_WIDETAG, 1);
133 return make_lispobj(ptr, OTHER_POINTER_LOWTAG);
138 alloc_base_string(char *str)
140 int len = strlen(str);
141 lispobj result = alloc_vector(SIMPLE_BASE_STRING_WIDETAG, len+1, 8);
142 struct vector *vec = (struct vector *)native_pointer(result);
144 vec->length = make_fixnum(len);
145 strcpy((char *)vec->data, str);
155 alloc_unboxed((int)SAP_WIDETAG, sizeof(struct sap)/sizeof(lispobj) -1);
157 return make_lispobj(sap,OTHER_POINTER_LOWTAG);