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authorLi Jin <dragon-fly@qq.com>2020-06-22 16:50:40 +0800
committerLi Jin <dragon-fly@qq.com>2020-06-22 16:50:40 +0800
commitcd2b60b101a398cb9356d746364e70eaed1860f1 (patch)
treea1fe71b76faabc4883f16905a94164ce5c23e692 /src/lua/lgc.h
parent88c1052e700f38cf3d8ad82d469da4c487760b7e (diff)
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add support for local variable declared with attribute 'close' and 'const' for Lua 5.4.
Diffstat (limited to 'src/lua/lgc.h')
-rw-r--r--src/lua/lgc.h186
1 files changed, 186 insertions, 0 deletions
diff --git a/src/lua/lgc.h b/src/lua/lgc.h
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1/*
2** $Id: lgc.h $
3** Garbage Collector
4** See Copyright Notice in lua.h
5*/
6
7#ifndef lgc_h
8#define lgc_h
9
10
11#include "lobject.h"
12#include "lstate.h"
13
14/*
15** Collectable objects may have one of three colors: white, which
16** means the object is not marked; gray, which means the
17** object is marked, but its references may be not marked; and
18** black, which means that the object and all its references are marked.
19** The main invariant of the garbage collector, while marking objects,
20** is that a black object can never point to a white one. Moreover,
21** any gray object must be in a "gray list" (gray, grayagain, weak,
22** allweak, ephemeron) so that it can be visited again before finishing
23** the collection cycle. These lists have no meaning when the invariant
24** is not being enforced (e.g., sweep phase).
25*/
26
27
28/*
29** Possible states of the Garbage Collector
30*/
31#define GCSpropagate 0
32#define GCSenteratomic 1
33#define GCSatomic 2
34#define GCSswpallgc 3
35#define GCSswpfinobj 4
36#define GCSswptobefnz 5
37#define GCSswpend 6
38#define GCScallfin 7
39#define GCSpause 8
40
41
42#define issweepphase(g) \
43 (GCSswpallgc <= (g)->gcstate && (g)->gcstate <= GCSswpend)
44
45
46/*
47** macro to tell when main invariant (white objects cannot point to black
48** ones) must be kept. During a collection, the sweep
49** phase may break the invariant, as objects turned white may point to
50** still-black objects. The invariant is restored when sweep ends and
51** all objects are white again.
52*/
53
54#define keepinvariant(g) ((g)->gcstate <= GCSatomic)
55
56
57/*
58** some useful bit tricks
59*/
60#define resetbits(x,m) ((x) &= cast_byte(~(m)))
61#define setbits(x,m) ((x) |= (m))
62#define testbits(x,m) ((x) & (m))
63#define bitmask(b) (1<<(b))
64#define bit2mask(b1,b2) (bitmask(b1) | bitmask(b2))
65#define l_setbit(x,b) setbits(x, bitmask(b))
66#define resetbit(x,b) resetbits(x, bitmask(b))
67#define testbit(x,b) testbits(x, bitmask(b))
68
69
70/*
71** Layout for bit use in 'marked' field. First three bits are
72** used for object "age" in generational mode. Last bit is free
73** to be used by respective objects.
74*/
75#define WHITE0BIT 3 /* object is white (type 0) */
76#define WHITE1BIT 4 /* object is white (type 1) */
77#define BLACKBIT 5 /* object is black */
78#define FINALIZEDBIT 6 /* object has been marked for finalization */
79
80
81
82#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)
83
84
85#define iswhite(x) testbits((x)->marked, WHITEBITS)
86#define isblack(x) testbit((x)->marked, BLACKBIT)
87#define isgray(x) /* neither white nor black */ \
88 (!testbits((x)->marked, WHITEBITS | bitmask(BLACKBIT)))
89
90#define tofinalize(x) testbit((x)->marked, FINALIZEDBIT)
91
92#define otherwhite(g) ((g)->currentwhite ^ WHITEBITS)
93#define isdeadm(ow,m) ((m) & (ow))
94#define isdead(g,v) isdeadm(otherwhite(g), (v)->marked)
95
96#define changewhite(x) ((x)->marked ^= WHITEBITS)
97#define gray2black(x) l_setbit((x)->marked, BLACKBIT)
98
99#define luaC_white(g) cast_byte((g)->currentwhite & WHITEBITS)
100
101
102/* object age in generational mode */
103#define G_NEW 0 /* created in current cycle */
104#define G_SURVIVAL 1 /* created in previous cycle */
105#define G_OLD0 2 /* marked old by frw. barrier in this cycle */
106#define G_OLD1 3 /* first full cycle as old */
107#define G_OLD 4 /* really old object (not to be visited) */
108#define G_TOUCHED1 5 /* old object touched this cycle */
109#define G_TOUCHED2 6 /* old object touched in previous cycle */
110
111#define AGEBITS 7 /* all age bits (111) */
112
113#define getage(o) ((o)->marked & AGEBITS)
114#define setage(o,a) ((o)->marked = cast_byte(((o)->marked & (~AGEBITS)) | a))
115#define isold(o) (getage(o) > G_SURVIVAL)
116
117#define changeage(o,f,t) \
118 check_exp(getage(o) == (f), (o)->marked ^= ((f)^(t)))
119
120
121/* Default Values for GC parameters */
122#define LUAI_GENMAJORMUL 100
123#define LUAI_GENMINORMUL 20
124
125/* wait memory to double before starting new cycle */
126#define LUAI_GCPAUSE 200
127
128/*
129** some gc parameters are stored divided by 4 to allow a maximum value
130** up to 1023 in a 'lu_byte'.
131*/
132#define getgcparam(p) ((p) * 4)
133#define setgcparam(p,v) ((p) = (v) / 4)
134
135#define LUAI_GCMUL 100
136
137/* how much to allocate before next GC step (log2) */
138#define LUAI_GCSTEPSIZE 13 /* 8 KB */
139
140
141/*
142** Check whether the declared GC mode is generational. While in
143** generational mode, the collector can go temporarily to incremental
144** mode to improve performance. This is signaled by 'g->lastatomic != 0'.
145*/
146#define isdecGCmodegen(g) (g->gckind == KGC_GEN || g->lastatomic != 0)
147
148/*
149** Does one step of collection when debt becomes positive. 'pre'/'pos'
150** allows some adjustments to be done only when needed. macro
151** 'condchangemem' is used only for heavy tests (forcing a full
152** GC cycle on every opportunity)
153*/
154#define luaC_condGC(L,pre,pos) \
155 { if (G(L)->GCdebt > 0) { pre; luaC_step(L); pos;}; \
156 condchangemem(L,pre,pos); }
157
158/* more often than not, 'pre'/'pos' are empty */
159#define luaC_checkGC(L) luaC_condGC(L,(void)0,(void)0)
160
161
162#define luaC_barrier(L,p,v) ( \
163 (iscollectable(v) && isblack(p) && iswhite(gcvalue(v))) ? \
164 luaC_barrier_(L,obj2gco(p),gcvalue(v)) : cast_void(0))
165
166#define luaC_barrierback(L,p,v) ( \
167 (iscollectable(v) && isblack(p) && iswhite(gcvalue(v))) ? \
168 luaC_barrierback_(L,p) : cast_void(0))
169
170#define luaC_objbarrier(L,p,o) ( \
171 (isblack(p) && iswhite(o)) ? \
172 luaC_barrier_(L,obj2gco(p),obj2gco(o)) : cast_void(0))
173
174LUAI_FUNC void luaC_fix (lua_State *L, GCObject *o);
175LUAI_FUNC void luaC_freeallobjects (lua_State *L);
176LUAI_FUNC void luaC_step (lua_State *L);
177LUAI_FUNC void luaC_runtilstate (lua_State *L, int statesmask);
178LUAI_FUNC void luaC_fullgc (lua_State *L, int isemergency);
179LUAI_FUNC GCObject *luaC_newobj (lua_State *L, int tt, size_t sz);
180LUAI_FUNC void luaC_barrier_ (lua_State *L, GCObject *o, GCObject *v);
181LUAI_FUNC void luaC_barrierback_ (lua_State *L, GCObject *o);
182LUAI_FUNC void luaC_checkfinalizer (lua_State *L, GCObject *o, Table *mt);
183LUAI_FUNC void luaC_changemode (lua_State *L, int newmode);
184
185
186#endif