A modern Music Player Daemon based on Rockbox open source high quality audio player
tsiry-sandratraina.com
libadwaita
audio
rust
zig
deno
mpris
rockbox
mpd
1/*
2** $Id$
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
13
14/*
15** Possible states of the Garbage Collector
16*/
17#define GCSpause 0
18#define GCSpropagate 1
19#define GCSsweepstring 2
20#define GCSsweep 3
21#define GCSfinalize 4
22
23
24/*
25** some userful bit tricks
26*/
27#define resetbits(x,m) ((x) &= cast(lu_byte, ~(m)))
28#define setbits(x,m) ((x) |= (m))
29#define testbits(x,m) ((x) & (m))
30#define bitmask(b) (1<<(b))
31#define bit2mask(b1,b2) (bitmask(b1) | bitmask(b2))
32#define l_setbit(x,b) setbits(x, bitmask(b))
33#define resetbit(x,b) resetbits(x, bitmask(b))
34#define testbit(x,b) testbits(x, bitmask(b))
35#define set2bits(x,b1,b2) setbits(x, (bit2mask(b1, b2)))
36#define reset2bits(x,b1,b2) resetbits(x, (bit2mask(b1, b2)))
37#define test2bits(x,b1,b2) testbits(x, (bit2mask(b1, b2)))
38
39
40/*
41** Possible Garbage Collector flags.
42** Layout for bit use in 'gsflags' field in global_State structure.
43** bit 0 - Protect GC from recursive calls.
44** bit 1 - Don't try to shrink string table if EGC was called during a string table resize.
45*/
46#define GCFlagsNone 0
47#define GCBlockGCBit 0
48#define GCResizingStringsBit 1
49
50
51#define is_block_gc(L) testbit(G(L)->gcflags, GCBlockGCBit)
52#define set_block_gc(L) l_setbit(G(L)->gcflags, GCBlockGCBit)
53#define unset_block_gc(L) resetbit(G(L)->gcflags, GCBlockGCBit)
54#define is_resizing_strings_gc(L) testbit(G(L)->gcflags, GCResizingStringsBit)
55#define set_resizing_strings_gc(L) l_setbit(G(L)->gcflags, GCResizingStringsBit)
56#define unset_resizing_strings_gc(L) resetbit(G(L)->gcflags, GCResizingStringsBit)
57
58/*
59** Layout for bit use in `marked' field:
60** bit 0 - object is white (type 0)
61** bit 1 - object is white (type 1)
62** bit 2 - object is black
63** bit 3 - for thread: Don't resize thread's stack
64** bit 3 - for userdata: has been finalized
65** bit 3 - for tables: has weak keys
66** bit 4 - for tables: has weak values
67** bit 5 - object is fixed (should not be collected)
68** bit 6 - object is "super" fixed (only the main thread)
69*/
70
71
72#define WHITE0BIT 0
73#define WHITE1BIT 1
74#define BLACKBIT 2
75#define FIXEDSTACKBIT 3
76#define FINALIZEDBIT 3
77#define KEYWEAKBIT 3
78#define VALUEWEAKBIT 4
79#define FIXEDBIT 5
80#define SFIXEDBIT 6
81#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)
82
83
84#define iswhite(x) test2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)
85#define isblack(x) testbit((x)->gch.marked, BLACKBIT)
86#define isgray(x) (!isblack(x) && !iswhite(x))
87
88#define otherwhite(g) (g->currentwhite ^ WHITEBITS)
89#define isdead(g,v) ((v)->gch.marked & otherwhite(g) & WHITEBITS)
90
91#define changewhite(x) ((x)->gch.marked ^= WHITEBITS)
92#define gray2black(x) l_setbit((x)->gch.marked, BLACKBIT)
93
94#define valiswhite(x) (iscollectable(x) && iswhite(gcvalue(x)))
95
96#define luaC_white(g) cast(lu_byte, (g)->currentwhite & WHITEBITS)
97
98#define isfixedstack(x) testbit((x)->marked, FIXEDSTACKBIT)
99#define fixedstack(x) l_setbit((x)->marked, FIXEDSTACKBIT)
100#define unfixedstack(x) resetbit((x)->marked, FIXEDSTACKBIT)
101
102#define luaC_checkGC(L) { \
103 condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1)); \
104 if (G(L)->totalbytes >= G(L)->GCthreshold) \
105 luaC_step(L); }
106
107
108#define luaC_barrier(L,p,v) { if (valiswhite(v) && isblack(obj2gco(p))) \
109 luaC_barrierf(L,obj2gco(p),gcvalue(v)); }
110
111#define luaC_barriert(L,t,v) { if (valiswhite(v) && isblack(obj2gco(t))) \
112 luaC_barrierback(L,t); }
113
114#define luaC_objbarrier(L,p,o) \
115 { if (iswhite(obj2gco(o)) && isblack(obj2gco(p))) \
116 luaC_barrierf(L,obj2gco(p),obj2gco(o)); }
117
118#define luaC_objbarriert(L,t,o) \
119 { if (iswhite(obj2gco(o)) && isblack(obj2gco(t))) luaC_barrierback(L,t); }
120
121LUAI_FUNC size_t luaC_separateudata (lua_State *L, int all);
122LUAI_FUNC void luaC_callGCTM (lua_State *L);
123LUAI_FUNC void luaC_freeall (lua_State *L);
124LUAI_FUNC void luaC_step (lua_State *L);
125LUAI_FUNC void luaC_fullgc (lua_State *L);
126LUAI_FUNC int luaC_sweepstrgc (lua_State *L);
127LUAI_FUNC void luaC_marknew (lua_State *L, GCObject *o);
128LUAI_FUNC void luaC_link (lua_State *L, GCObject *o, lu_byte tt);
129LUAI_FUNC void luaC_linkupval (lua_State *L, UpVal *uv);
130LUAI_FUNC void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v);
131LUAI_FUNC void luaC_barrierback (lua_State *L, Table *t);
132
133
134#endif