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 "pseudo-atomic.h"
28 #include "genesis/vector.h"
29 #include "genesis/cons.h"
30 #include "genesis/bignum.h"
31 #include "genesis/sap.h"
32 #include "genesis/code.h"
34 #define ALIGNED_SIZE(n) ((n) + LOWTAG_MASK) & ~LOWTAG_MASK
36 #ifdef LISP_FEATURE_GENCGC
38 pa_alloc(int bytes, int page_type_flag)
41 struct thread *th = arch_os_get_current_thread();
43 /* FIXME: OOAO violation: see arch_pseudo_* */
44 set_pseudo_atomic_atomic(th);
45 result = general_alloc(bytes, page_type_flag);
47 /* See how the runtime deals with GC being triggerred. */
48 if ((SymbolValue(GC_PENDING,th) == NIL) &&
49 (SymbolValue(GC_INHIBIT,th) == NIL) &&
50 (random() < RAND_MAX/100)) {
51 SetSymbolValue(GC_PENDING,T,th);
52 set_pseudo_atomic_interrupted(th);
53 maybe_save_gc_mask_and_block_deferrables(NULL);
56 clear_pseudo_atomic_atomic(th);
58 if (get_pseudo_atomic_interrupted(th)) {
59 /* WARNING KLUDGE FIXME: pa_alloc() is not pseudo-atomic on
60 * anything but x86[-64]. maybe_defer_handler doesn't defer
61 * interrupts if foreign_function_call_active
63 * If the C stack is not scavenged during GC, result needs to
64 * be protected against not being referred to by any roots, so
65 * we push it onto the lisp control stack, and read it back
66 * off after any potential GC has finished */
67 #ifndef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
68 #ifdef LISP_FEATURE_STACK_GROWS_DOWNWARD_NOT_UPWARD
69 #error "!C_STACK_IS_CONTROL_STACK and STACK_GROWS_DOWNWARD_NOT_UPWARD is not supported"
71 *current_control_stack_pointer = (lispobj) result;
72 current_control_stack_pointer += 1;
74 do_pending_interrupt();
75 #ifndef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
76 current_control_stack_pointer -= 1;
77 result = (lispobj *) *current_control_stack_pointer;
84 pa_alloc(int bytes, int page_type_flag)
88 /* This is not pseudo atomic at all, but is called only from
89 * interrupt safe places like interrupt handlers. MG -
91 check_deferrables_blocked_or_lose();
93 result = dynamic_space_free_pointer;
95 /* Align up to next dual word boundary. */
96 bytes = ALIGNED_SIZE(bytes);
98 dynamic_space_free_pointer = (lispobj *)((char *)result + bytes);
100 if (current_auto_gc_trigger
101 && dynamic_space_free_pointer > current_auto_gc_trigger) {
102 clear_auto_gc_trigger();
103 set_auto_gc_trigger((char *)dynamic_space_free_pointer
104 - (char *)current_dynamic_space);
111 alloc_unboxed(int type, int words)
115 result = pa_alloc(ALIGNED_SIZE((1 + words) * sizeof(lispobj)),
117 *result = (lispobj) (words << N_WIDETAG_BITS) | type;
122 alloc_vector(int type, int length, int size, int page_type_flag)
124 struct vector *result;
126 result = (struct vector *)
127 pa_alloc(ALIGNED_SIZE((2 + (length*size + 31) / 32) * sizeof(lispobj)),
130 result->header = type;
131 result->length = make_fixnum(length);
133 return make_lispobj(result,OTHER_POINTER_LOWTAG);
137 alloc_cons(lispobj car, lispobj cdr)
140 (struct cons *)pa_alloc(ALIGNED_SIZE(sizeof(struct cons)),
146 return make_lispobj(ptr, LIST_POINTER_LOWTAG);
154 if (-0x20000000 < n && n < 0x20000000)
155 return make_fixnum(n);
157 ptr = (struct bignum *)alloc_unboxed(BIGNUM_WIDETAG, 1);
161 return make_lispobj(ptr, OTHER_POINTER_LOWTAG);
166 alloc_base_string(char *str)
168 int len = strlen(str);
169 lispobj result = alloc_vector(SIMPLE_BASE_STRING_WIDETAG, len+1, 8,
171 struct vector *vec = (struct vector *)native_pointer(result);
173 vec->length = make_fixnum(len);
174 strcpy((char *)vec->data, str);
184 alloc_unboxed((int)SAP_WIDETAG, sizeof(struct sap)/sizeof(lispobj) -1);
186 return make_lispobj(sap,OTHER_POINTER_LOWTAG);
190 alloc_code_object (unsigned boxed, unsigned unboxed) {
192 /* 4 == trace_table_offset offset in words */
193 boxed = make_fixnum(boxed + 1 + 4);
194 boxed &= ~LOWTAG_MASK;
196 unboxed += LOWTAG_MASK;
197 unboxed &= ~LOWTAG_MASK;
199 code = (struct code *)pa_alloc(ALIGNED_SIZE((boxed + unboxed) *
203 boxed = boxed << (N_WIDETAG_BITS - WORD_SHIFT);
204 code->header = boxed | CODE_HEADER_WIDETAG;
205 code->code_size = unboxed;
206 code->entry_points = NIL;
207 code->debug_info = NIL;
208 return make_lispobj(code, OTHER_POINTER_LOWTAG);