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148 lines
5.1 KiB
C
148 lines
5.1 KiB
C
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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// This code is based on Lua 5.x implementation licensed under MIT License; see lua_LICENSE.txt for details
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#pragma once
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#include "ldo.h"
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#include "lobject.h"
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#include "lstate.h"
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/*
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** Default settings for GC tunables (settable via lua_gc)
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*/
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#define LUAI_GCGOAL 200 /* 200% (allow heap to double compared to live heap size) */
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#define LUAI_GCSTEPMUL 200 /* GC runs 'twice the speed' of memory allocation */
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#define LUAI_GCSTEPSIZE 1 /* GC runs every KB of memory allocation */
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/*
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** Possible states of the Garbage Collector
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*/
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#define GCSpause 0
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#define GCSpropagate 1
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#define GCSpropagateagain 2
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#define GCSatomic 3
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#define GCSsweep 4
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/*
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** macro to tell when main invariant (white objects cannot point to black
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** ones) must be kept. During a collection, the sweep
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** phase may break the invariant, as objects turned white may point to
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** still-black objects. The invariant is restored when sweep ends and
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** all objects are white again.
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*/
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#define keepinvariant(g) ((g)->gcstate == GCSpropagate || (g)->gcstate == GCSpropagateagain || (g)->gcstate == GCSatomic)
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/*
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** some useful bit tricks
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*/
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#define resetbits(x, m) ((x) &= cast_to(uint8_t, ~(m)))
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#define setbits(x, m) ((x) |= (m))
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#define testbits(x, m) ((x) & (m))
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#define bitmask(b) (1 << (b))
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#define bit2mask(b1, b2) (bitmask(b1) | bitmask(b2))
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#define l_setbit(x, b) setbits(x, bitmask(b))
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#define resetbit(x, b) resetbits(x, bitmask(b))
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#define testbit(x, b) testbits(x, bitmask(b))
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#define set2bits(x, b1, b2) setbits(x, (bit2mask(b1, b2)))
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#define reset2bits(x, b1, b2) resetbits(x, (bit2mask(b1, b2)))
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#define test2bits(x, b1, b2) testbits(x, (bit2mask(b1, b2)))
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/*
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** Layout for bit use in `marked' field:
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** bit 0 - object is white (type 0)
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** bit 1 - object is white (type 1)
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** bit 2 - object is black
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** bit 3 - object is fixed (should not be collected)
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*/
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#define WHITE0BIT 0
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#define WHITE1BIT 1
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#define BLACKBIT 2
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#define FIXEDBIT 3
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#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)
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#define iswhite(x) test2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)
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#define isblack(x) testbit((x)->gch.marked, BLACKBIT)
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#define isgray(x) (!testbits((x)->gch.marked, WHITEBITS | bitmask(BLACKBIT)))
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#define isfixed(x) testbit((x)->gch.marked, FIXEDBIT)
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#define otherwhite(g) (g->currentwhite ^ WHITEBITS)
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#define isdead(g, v) (((v)->gch.marked & (WHITEBITS | bitmask(FIXEDBIT))) == (otherwhite(g) & WHITEBITS))
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#define changewhite(x) ((x)->gch.marked ^= WHITEBITS)
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#define gray2black(x) l_setbit((x)->gch.marked, BLACKBIT)
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#define luaC_white(g) cast_to(uint8_t, ((g)->currentwhite) & WHITEBITS)
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// Thread stack states
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#define THREAD_ACTIVEBIT 0 // thread is currently active
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#define THREAD_SLEEPINGBIT 1 // thread is not executing and stack should not be modified
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#define luaC_threadactive(L) (testbit((L)->stackstate, THREAD_ACTIVEBIT))
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#define luaC_threadsleeping(L) (testbit((L)->stackstate, THREAD_SLEEPINGBIT))
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#define luaC_checkGC(L) \
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{ \
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condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK)); \
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if (L->global->totalbytes >= L->global->GCthreshold) \
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{ \
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condhardmemtests(luaC_validate(L), 1); \
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luaC_step(L, true); \
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} \
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else \
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{ \
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condhardmemtests(luaC_validate(L), 2); \
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} \
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}
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#define luaC_barrier(L, p, v) \
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{ \
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if (iscollectable(v) && isblack(obj2gco(p)) && iswhite(gcvalue(v))) \
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luaC_barrierf(L, obj2gco(p), gcvalue(v)); \
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}
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#define luaC_barriert(L, t, v) \
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{ \
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if (iscollectable(v) && isblack(obj2gco(t)) && iswhite(gcvalue(v))) \
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luaC_barriertable(L, t, gcvalue(v)); \
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}
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#define luaC_barrierfast(L, t) \
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{ \
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if (isblack(obj2gco(t))) \
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luaC_barrierback(L, t); \
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}
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#define luaC_objbarrier(L, p, o) \
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{ \
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if (isblack(obj2gco(p)) && iswhite(obj2gco(o))) \
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luaC_barrierf(L, obj2gco(p), obj2gco(o)); \
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}
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#define luaC_upvalbarrier(L, uv, tv) \
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{ \
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if (iscollectable(tv) && iswhite(gcvalue(tv)) && (!(uv) || (uv)->v != &(uv)->u.value)) \
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luaC_barrierupval(L, gcvalue(tv)); \
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}
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#define luaC_checkthreadsleep(L) \
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{ \
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if (luaC_threadsleeping(L)) \
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luaC_wakethread(L); \
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}
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#define luaC_init(L, o, tt) luaC_initobj(L, cast_to(GCObject*, (o)), tt)
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LUAI_FUNC void luaC_freeall(lua_State* L);
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LUAI_FUNC size_t luaC_step(lua_State* L, bool assist);
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LUAI_FUNC void luaC_fullgc(lua_State* L);
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LUAI_FUNC void luaC_initobj(lua_State* L, GCObject* o, uint8_t tt);
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LUAI_FUNC void luaC_initupval(lua_State* L, UpVal* uv);
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LUAI_FUNC void luaC_barrierupval(lua_State* L, GCObject* v);
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LUAI_FUNC void luaC_barrierf(lua_State* L, GCObject* o, GCObject* v);
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LUAI_FUNC void luaC_barriertable(lua_State* L, Table* t, GCObject* v);
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LUAI_FUNC void luaC_barrierback(lua_State* L, Table* t);
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LUAI_FUNC void luaC_validate(lua_State* L);
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LUAI_FUNC void luaC_dump(lua_State* L, void* file, const char* (*categoryName)(lua_State* L, uint8_t memcat));
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LUAI_FUNC int64_t luaC_allocationrate(lua_State* L);
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LUAI_FUNC void luaC_wakethread(lua_State* L);
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LUAI_FUNC const char* luaC_statename(int state);
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