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"
31 #include "genesis/code.h"
33 #define ALIGNED_SIZE(n) ((n) + LOWTAG_MASK) & ~LOWTAG_MASK
35 #ifdef LISP_FEATURE_GENCGC
37 pa_alloc(int bytes
, int page_type_flag
)
40 struct thread
*th
= arch_os_get_current_thread();
42 /* FIXME: OOAO violation: see arch_pseudo_* */
43 clear_pseudo_atomic_interrupted(th
);
44 set_pseudo_atomic_atomic(th
);
45 result
= general_alloc(bytes
, page_type_flag
);
46 clear_pseudo_atomic_atomic(th
);
48 if (get_pseudo_atomic_interrupted(th
)) {
49 /* WARNING KLUDGE FIXME: pa_alloc() is not pseudo-atomic on
50 * anything but x86[-64]. maybe_defer_handler doesn't defer
51 * interrupts if foreign_function_call_active
53 * If the C stack is not scavenged during GC, result needs to
54 * be protected against not being referred to by any roots, so
55 * we push it onto the lisp control stack, and read it back
56 * off after any potential GC has finished */
57 #ifndef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
58 #ifdef LISP_FEATURE_STACK_GROWS_DOWNWARD_NOT_UPWARD
59 #error "!C_STACK_IS_CONTROL_STACK and STACK_GROWS_DOWNWARD_NOT_UPWARD is not supported"
61 *current_control_stack_pointer
= (lispobj
) result
;
62 current_control_stack_pointer
+= 1;
64 do_pending_interrupt();
65 #ifndef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
66 current_control_stack_pointer
-= 1;
67 result
= (lispobj
*) *current_control_stack_pointer
;
74 pa_alloc(int bytes
, int page_type_flag
)
78 /* FIXME: this is not pseudo atomic at all, but is called only from
79 * interrupt safe places like interrupt handlers. MG - 2005-08-09 */
80 result
= dynamic_space_free_pointer
;
82 /* Align up to next dual word boundary. */
83 bytes
= ALIGNED_SIZE(bytes
);
85 dynamic_space_free_pointer
= (lispobj
*)((char *)result
+ bytes
);
87 if (current_auto_gc_trigger
88 && dynamic_space_free_pointer
> current_auto_gc_trigger
) {
89 clear_auto_gc_trigger();
90 set_auto_gc_trigger((char *)dynamic_space_free_pointer
91 - (char *)current_dynamic_space
);
98 alloc_unboxed(int type
, int words
)
102 result
= pa_alloc(ALIGNED_SIZE((1 + words
) * sizeof(lispobj
)), UNBOXED_PAGE_FLAG
);
103 *result
= (lispobj
) (words
<< N_WIDETAG_BITS
) | type
;
108 alloc_vector(int type
, int length
, int size
, int page_type_flag
)
110 struct vector
*result
;
112 result
= (struct vector
*)
113 pa_alloc(ALIGNED_SIZE((2 + (length
*size
+ 31) / 32) * sizeof(lispobj
)), page_type_flag
);
115 result
->header
= type
;
116 result
->length
= make_fixnum(length
);
118 return make_lispobj(result
,OTHER_POINTER_LOWTAG
);
122 alloc_cons(lispobj car
, lispobj cdr
)
125 (struct cons
*)pa_alloc(ALIGNED_SIZE(sizeof(struct cons
)), BOXED_PAGE_FLAG
);
130 return make_lispobj(ptr
, LIST_POINTER_LOWTAG
);
138 if (-0x20000000 < n
&& n
< 0x20000000)
139 return make_fixnum(n
);
141 ptr
= (struct bignum
*)alloc_unboxed(BIGNUM_WIDETAG
, 1);
145 return make_lispobj(ptr
, OTHER_POINTER_LOWTAG
);
150 alloc_base_string(char *str
)
152 int len
= strlen(str
);
153 lispobj result
= alloc_vector(SIMPLE_BASE_STRING_WIDETAG
, len
+1, 8, UNBOXED_PAGE_FLAG
);
154 struct vector
*vec
= (struct vector
*)native_pointer(result
);
156 vec
->length
= make_fixnum(len
);
157 strcpy((char *)vec
->data
, str
);
167 alloc_unboxed((int)SAP_WIDETAG
, sizeof(struct sap
)/sizeof(lispobj
) -1);
169 return make_lispobj(sap
,OTHER_POINTER_LOWTAG
);
173 alloc_code_object (unsigned boxed
, unsigned unboxed
) {
176 boxed
= make_fixnum(boxed
+ 1 + 4); /* 4 == trace_table_offset offset in words */
177 boxed
&= ~LOWTAG_MASK
;
179 unboxed
+= LOWTAG_MASK
;
180 unboxed
&= ~LOWTAG_MASK
;
182 code
= (struct code
*) pa_alloc(ALIGNED_SIZE((boxed
+ unboxed
) * sizeof(lispobj
)),
185 boxed
= boxed
<< (N_WIDETAG_BITS
- WORD_SHIFT
);
186 code
->header
= boxed
| CODE_HEADER_WIDETAG
;
187 code
->code_size
= unboxed
;
188 code
->entry_points
= NIL
;
189 code
->debug_info
= NIL
;
190 return make_lispobj(code
, OTHER_POINTER_LOWTAG
);