Ruby 2.1.5p273(2014-11-13revision48405)

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eval_jump.c
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1 /* -*-c-*- */
2 /*
3 * from eval.c
4 */
5
6 #include "eval_intern.h"
7
8 /* exit */
9
10 void
11 rb_call_end_proc(VALUE data)
12 {
13 rb_proc_call(data, rb_ary_new());
14 }
15
16 /*
17 * call-seq:
18 * at_exit { block } -> proc
19 *
20 * Converts _block_ to a +Proc+ object (and therefore
21 * binds it at the point of call) and registers it for execution when
22 * the program exits. If multiple handlers are registered, they are
23 * executed in reverse order of registration.
24 *
25 * def do_at_exit(str1)
26 * at_exit { print str1 }
27 * end
28 * at_exit { puts "cruel world" }
29 * do_at_exit("goodbye ")
30 * exit
31 *
32 * <em>produces:</em>
33 *
34 * goodbye cruel world
35 */
36
37 static VALUE
38 rb_f_at_exit(void)
39 {
40 VALUE proc;
41
42 if (!rb_block_given_p()) {
43 rb_raise(rb_eArgError, "called without a block");
44 }
45 proc = rb_block_proc();
46 rb_set_end_proc(rb_call_end_proc, proc);
47 return proc;
48 }
49
50 struct end_proc_data {
51 void (*func) ();
52 VALUE data;
53 int safe;
54 struct end_proc_data *next;
55 };
56
57 static struct end_proc_data *end_procs, *ephemeral_end_procs;
58
59 void
60 rb_set_end_proc(void (*func)(VALUE), VALUE data)
61 {
62 struct end_proc_data *link = ALLOC(struct end_proc_data);
63 struct end_proc_data **list;
64 rb_thread_t *th = GET_THREAD();
65
66 if (th->top_wrapper) {
67 list = &ephemeral_end_procs;
68 }
69 else {
70 list = &end_procs;
71 }
72 link->next = *list;
73 link->func = func;
74 link->data = data;
75 link->safe = rb_safe_level();
76 *list = link;
77 }
78
79 void
80 rb_mark_end_proc(void)
81 {
82 struct end_proc_data *link;
83
84 link = end_procs;
85 while (link) {
86 rb_gc_mark(link->data);
87 link = link->next;
88 }
89 link = ephemeral_end_procs;
90 while (link) {
91 rb_gc_mark(link->data);
92 link = link->next;
93 }
94 }
95
96 static void
97 exec_end_procs_chain(struct end_proc_data *volatile *procs)
98 {
99 struct end_proc_data volatile endproc;
100 struct end_proc_data *link;
101
102 while ((link = *procs) != 0) {
103 *procs = link->next;
104 endproc = *link;
105 xfree(link);
106 rb_set_safe_level_force(endproc.safe);
107 (*endproc.func) (endproc.data);
108 }
109 }
110
111 void
112 rb_exec_end_proc(void)
113 {
114 int status;
115 volatile int safe = rb_safe_level();
116 rb_thread_t *th = GET_THREAD();
117 volatile VALUE errinfo = th->errinfo;
118
119 PUSH_TAG();
120 if ((status = EXEC_TAG()) == 0) {
121 again:
122 exec_end_procs_chain(&ephemeral_end_procs);
123 exec_end_procs_chain(&end_procs);
124 }
125 else {
126 TH_TMPPOP_TAG();
127 error_handle(status);
128 if (!NIL_P(th->errinfo)) errinfo = th->errinfo;
129 TH_REPUSH_TAG();
130 goto again;
131 }
132 POP_TAG();
133
134 rb_set_safe_level_force(safe);
135 th->errinfo = errinfo;
136 }
137
138 void
139 Init_jump(void)
140 {
141 rb_define_global_function("at_exit", rb_f_at_exit, 0);
142 }
rb_exec_end_proc
void rb_exec_end_proc(void)
Definition: eval_jump.c:112
eval_intern.h
Init_jump
void Init_jump(void)
Definition: eval_jump.c:139
rb_raise
void rb_raise(VALUE exc, const char *fmt,...)
Definition: error.c:1857
rb_gc_mark
void rb_gc_mark(VALUE ptr)
Definition: gc.c:3604
PUSH_TAG
#define PUSH_TAG()
Definition: eval_intern.h:141
rb_define_global_function
void rb_define_global_function(const char *name, VALUE(*func)(ANYARGS), int argc)
Defines a global function.
Definition: class.c:1684
rb_thread_struct
Definition: vm_core.h:524
rb_mark_end_proc
void rb_mark_end_proc(void)
Definition: eval_jump.c:80
error_handle
static int error_handle(int ex)
Definition: eval_error.c:245
rb_block_given_p
int rb_block_given_p(void)
Definition: eval.c:712
EXEC_TAG
#define EXEC_TAG()
Definition: eval_intern.h:168
rb_ary_new
VALUE rb_ary_new(void)
Definition: array.c:495
NIL_P
#define NIL_P(v)
Definition: ruby.h:438
ephemeral_end_procs
static struct end_proc_data * ephemeral_end_procs
Definition: eval_jump.c:57
POP_TAG
#define POP_TAG()
Definition: eval_intern.h:142
link
int link(const char *, const char *)
Definition: win32.c:4595
ALLOC
#define ALLOC(type)
Definition: ruby.h:1334
rb_call_end_proc
void rb_call_end_proc(VALUE data)
Definition: eval_jump.c:11
func
SSL_METHOD *(* func)(void)
Definition: ossl_ssl.c:113
end_proc_data::data
VALUE data
Definition: eval_jump.c:52
VALUE
unsigned long VALUE
Definition: ruby.h:88
rb_proc_call
VALUE rb_proc_call(VALUE, VALUE)
Definition: proc.c:733
TH_TMPPOP_TAG
#define TH_TMPPOP_TAG()
Definition: eval_intern.h:137
rb_set_end_proc
void rb_set_end_proc(void(*func)(VALUE), VALUE data)
Definition: eval_jump.c:60
rb_set_safe_level_force
void rb_set_safe_level_force(int)
Definition: safe.c:43
end_procs
static struct end_proc_data * end_procs
Definition: eval_jump.c:57
exec_end_procs_chain
static void exec_end_procs_chain(struct end_proc_data *volatile *procs)
Definition: eval_jump.c:97
end_proc_data
Definition: eval_jump.c:50
rb_thread_struct::top_wrapper
VALUE top_wrapper
Definition: vm_core.h:552
rb_block_proc
VALUE rb_block_proc(void)
Definition: proc.c:620
end_proc_data::safe
int safe
Definition: eval_jump.c:53
end_proc_data::func
void(* func)()
Definition: eval_jump.c:51
list
struct rb_encoding_entry * list
Definition: encoding.c:47
rb_safe_level
#define rb_safe_level()
Definition: tcltklib.c:95
xfree
void void xfree(void *)
end_proc_data::next
struct end_proc_data * next
Definition: eval_jump.c:54
TH_REPUSH_TAG
#define TH_REPUSH_TAG()
Definition: eval_intern.h:139
rb_thread_struct::errinfo
VALUE errinfo
Definition: vm_core.h:573
rb_f_at_exit
static VALUE rb_f_at_exit(void)
Definition: eval_jump.c:38
GET_THREAD
static rb_thread_t * GET_THREAD(void)
Definition: vm_core.h:927
rb_eArgError
VALUE rb_eArgError
Definition: error.c:549