summaryrefslogtreecommitdiff
path: root/gc.h
blob: 5d113cafceb1379e056df9692241530ef4e1e63f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
#ifndef RUBY_GC_H
#define RUBY_GC_H 1
#include "ruby/ruby.h"

#if defined(__x86_64__) && !defined(_ILP32) && defined(__GNUC__)
#define SET_MACHINE_STACK_END(p) __asm__ __volatile__ ("movq\t%%rsp, %0" : "=r" (*(p)))
#elif defined(__i386) && defined(__GNUC__)
#define SET_MACHINE_STACK_END(p) __asm__ __volatile__ ("movl\t%%esp, %0" : "=r" (*(p)))
#elif defined(__powerpc64__) && defined(__GNUC__)
#define SET_MACHINE_STACK_END(p) __asm__ __volatile__ ("mr\t%0, %%r1" : "=r" (*(p)))
#elif defined(__aarch64__) && defined(__GNUC__)
#define SET_MACHINE_STACK_END(p) __asm__ __volatile__ ("mov\t%0, sp" : "=r" (*(p)))
#else
NOINLINE(void rb_gc_set_stack_end(VALUE **stack_end_p));
#define SET_MACHINE_STACK_END(p) rb_gc_set_stack_end(p)
#define USE_CONSERVATIVE_STACK_END
#endif

#define RB_GC_SAVE_MACHINE_CONTEXT(th)				\
    do {							\
	FLUSH_REGISTER_WINDOWS;					\
	setjmp((th)->ec->machine.regs);				\
	SET_MACHINE_STACK_END(&(th)->ec->machine.stack_end);	\
    } while (0)

/* for GC debug */

#ifndef RUBY_MARK_FREE_DEBUG
#define RUBY_MARK_FREE_DEBUG 0
#endif

#if RUBY_MARK_FREE_DEBUG
extern int ruby_gc_debug_indent;

static inline void
rb_gc_debug_indent(void)
{
    printf("%*s", ruby_gc_debug_indent, "");
}

static inline void
rb_gc_debug_body(const char *mode, const char *msg, int st, void *ptr)
{
    if (st == 0) {
	ruby_gc_debug_indent--;
    }
    rb_gc_debug_indent();
    printf("%s: %s %s (%p)\n", mode, st ? "->" : "<-", msg, ptr);

    if (st) {
	ruby_gc_debug_indent++;
    }

    fflush(stdout);
}

#define RUBY_MARK_ENTER(msg) rb_gc_debug_body("mark", (msg), 1, ptr)
#define RUBY_MARK_LEAVE(msg) rb_gc_debug_body("mark", (msg), 0, ptr)
#define RUBY_FREE_ENTER(msg) rb_gc_debug_body("free", (msg), 1, ptr)
#define RUBY_FREE_LEAVE(msg) rb_gc_debug_body("free", (msg), 0, ptr)
#define RUBY_GC_INFO         rb_gc_debug_indent(); printf

#else
#define RUBY_MARK_ENTER(msg)
#define RUBY_MARK_LEAVE(msg)
#define RUBY_FREE_ENTER(msg)
#define RUBY_FREE_LEAVE(msg)
#define RUBY_GC_INFO if(0)printf
#endif

#define RUBY_MARK_MOVABLE_UNLESS_NULL(ptr) do { \
    VALUE markobj = (ptr); \
    if (RTEST(markobj)) {rb_gc_mark_movable(markobj);} \
} while (0)
#define RUBY_MARK_UNLESS_NULL(ptr) do { \
    VALUE markobj = (ptr); \
    if (RTEST(markobj)) {rb_gc_mark(markobj);} \
} while (0)
#define RUBY_FREE_UNLESS_NULL(ptr) if(ptr){ruby_xfree(ptr);(ptr)=NULL;}

#if STACK_GROW_DIRECTION > 0
# define STACK_UPPER(x, a, b) (a)
#elif STACK_GROW_DIRECTION < 0
# define STACK_UPPER(x, a, b) (b)
#else
RUBY_EXTERN int ruby_stack_grow_direction;
int ruby_get_stack_grow_direction(volatile VALUE *addr);
# define stack_growup_p(x) (			\
	(ruby_stack_grow_direction ?		\
	 ruby_stack_grow_direction :		\
	 ruby_get_stack_grow_direction(x)) > 0)
# define STACK_UPPER(x, a, b) (stack_growup_p(x) ? (a) : (b))
#endif

/*
  STACK_GROW_DIR_DETECTION is used with STACK_DIR_UPPER.

  On most normal systems, stacks grow from high address to lower address. In
  this case, STACK_DIR_UPPER(a, b) will return (b), but on exotic systems where
  the stack grows UP (from low address to high address), it will return (a).
*/

#if STACK_GROW_DIRECTION
#define STACK_GROW_DIR_DETECTION
#define STACK_DIR_UPPER(a,b) STACK_UPPER(0, (a), (b))
#else
#define STACK_GROW_DIR_DETECTION VALUE stack_grow_dir_detection
#define STACK_DIR_UPPER(a,b) STACK_UPPER(&stack_grow_dir_detection, (a), (b))
#endif
#define IS_STACK_DIR_UPPER() STACK_DIR_UPPER(1,0)

const char *rb_obj_info(VALUE obj);
const char *rb_raw_obj_info(char *buff, const int buff_size, VALUE obj);

VALUE rb_gc_disable_no_rest(void);

struct rb_thread_struct;

RUBY_SYMBOL_EXPORT_BEGIN

/* exports for objspace module */
size_t rb_objspace_data_type_memsize(VALUE obj);
void rb_objspace_reachable_objects_from(VALUE obj, void (func)(VALUE, void *), void *data);
void rb_objspace_reachable_objects_from_root(void (func)(const char *category, VALUE, void *), void *data);
int rb_objspace_markable_object_p(VALUE obj);
int rb_objspace_internal_object_p(VALUE obj);
int rb_objspace_marked_object_p(VALUE obj);
int rb_objspace_garbage_object_p(VALUE obj);

void rb_objspace_each_objects(
    int (*callback)(void *start, void *end, size_t stride, void *data),
    void *data);

void rb_objspace_each_objects_without_setup(
    int (*callback)(void *, void *, size_t, void *),
    void *data);

RUBY_SYMBOL_EXPORT_END

#endif /* RUBY_GC_H */