luau/VM/src/lfunc.cpp

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// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
// This code is based on Lua 5.x implementation licensed under MIT License; see lua_LICENSE.txt for details
#include "lfunc.h"
#include "lstate.h"
#include "lmem.h"
#include "lgc.h"
Proto* luaF_newproto(lua_State* L)
{
Proto* f = luaM_newgco(L, Proto, sizeof(Proto), L->activememcat);
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luaC_init(L, f, LUA_TPROTO);
f->k = NULL;
f->sizek = 0;
f->p = NULL;
f->sizep = 0;
f->code = NULL;
f->sizecode = 0;
f->sizeupvalues = 0;
f->nups = 0;
f->upvalues = NULL;
f->numparams = 0;
f->is_vararg = 0;
f->maxstacksize = 0;
f->sizelineinfo = 0;
f->linegaplog2 = 0;
f->lineinfo = NULL;
f->abslineinfo = NULL;
f->sizelocvars = 0;
f->locvars = NULL;
f->source = NULL;
f->debugname = NULL;
f->debuginsn = NULL;
return f;
}
Closure* luaF_newLclosure(lua_State* L, int nelems, Table* e, Proto* p)
{
Closure* c = luaM_newgco(L, Closure, sizeLclosure(nelems), L->activememcat);
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luaC_init(L, c, LUA_TFUNCTION);
c->isC = 0;
c->env = e;
c->nupvalues = cast_byte(nelems);
c->stacksize = p->maxstacksize;
c->preload = 0;
c->l.p = p;
for (int i = 0; i < nelems; ++i)
setnilvalue(&c->l.uprefs[i]);
return c;
}
Closure* luaF_newCclosure(lua_State* L, int nelems, Table* e)
{
Closure* c = luaM_newgco(L, Closure, sizeCclosure(nelems), L->activememcat);
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luaC_init(L, c, LUA_TFUNCTION);
c->isC = 1;
c->env = e;
c->nupvalues = cast_byte(nelems);
c->stacksize = LUA_MINSTACK;
c->preload = 0;
c->c.f = NULL;
c->c.cont = NULL;
c->c.debugname = NULL;
return c;
}
UpVal* luaF_findupval(lua_State* L, StkId level)
{
global_State* g = L->global;
UpVal** pp = &L->openupval;
UpVal* p;
while (*pp != NULL && (p = *pp)->v >= level)
{
LUAU_ASSERT(p->v != &p->u.value);
if (p->v == level)
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{ // found a corresponding upvalue?
if (isdead(g, obj2gco(p))) // is it dead?
changewhite(obj2gco(p)); // resurrect it
return p;
}
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pp = &p->u.l.threadnext;
}
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UpVal* uv = luaM_newgco(L, UpVal, sizeof(UpVal), L->activememcat); // not found: create a new one
uv->tt = LUA_TUPVAL;
uv->marked = luaC_white(g);
uv->memcat = L->activememcat;
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uv->v = level; // current value lives in the stack
// chain the upvalue in the threads open upvalue list at the proper position
UpVal* next = *pp;
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uv->u.l.threadnext = next;
uv->u.l.threadprev = pp;
if (next)
next->u.l.threadprev = &uv->u.l.threadnext;
*pp = uv;
// double link the upvalue in the global open upvalue list
uv->u.l.prev = &g->uvhead;
uv->u.l.next = g->uvhead.u.l.next;
uv->u.l.next->u.l.prev = uv;
g->uvhead.u.l.next = uv;
LUAU_ASSERT(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
return uv;
}
void luaF_unlinkupval(UpVal* uv)
{
// unlink upvalue from the global open upvalue list
LUAU_ASSERT(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
uv->u.l.next->u.l.prev = uv->u.l.prev;
uv->u.l.prev->u.l.next = uv->u.l.next;
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// unlink upvalue from the thread open upvalue list
*uv->u.l.threadprev = uv->u.l.threadnext;
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if (UpVal* next = uv->u.l.threadnext)
next->u.l.threadprev = uv->u.l.threadprev;
}
void luaF_freeupval(lua_State* L, UpVal* uv, lua_Page* page)
{
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if (uv->v != &uv->u.value) // is it open?
luaF_unlinkupval(uv); // remove from open list
luaM_freegco(L, uv, sizeof(UpVal), uv->memcat, page); // free upvalue
}
void luaF_close(lua_State* L, StkId level)
{
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global_State* g = L->global;
UpVal* uv;
while (L->openupval != NULL && (uv = L->openupval)->v >= level)
{
GCObject* o = obj2gco(uv);
LUAU_ASSERT(!isblack(o) && uv->v != &uv->u.value);
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// by removing the upvalue from global/thread open upvalue lists, L->openupval will be pointing to the next upvalue
luaF_unlinkupval(uv);
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if (isdead(g, o))
{
// close the upvalue without copying the dead data so that luaF_freeupval will not unlink again
uv->v = &uv->u.value;
}
else
{
setobj(L, &uv->u.value, uv->v);
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uv->v = &uv->u.value;
// GC state of a new closed upvalue has to be initialized
luaC_initupval(L, uv);
}
}
}
void luaF_freeproto(lua_State* L, Proto* f, lua_Page* page)
{
luaM_freearray(L, f->code, f->sizecode, Instruction, f->memcat);
luaM_freearray(L, f->p, f->sizep, Proto*, f->memcat);
luaM_freearray(L, f->k, f->sizek, TValue, f->memcat);
if (f->lineinfo)
luaM_freearray(L, f->lineinfo, f->sizelineinfo, uint8_t, f->memcat);
luaM_freearray(L, f->locvars, f->sizelocvars, struct LocVar, f->memcat);
luaM_freearray(L, f->upvalues, f->sizeupvalues, TString*, f->memcat);
if (f->debuginsn)
luaM_freearray(L, f->debuginsn, f->sizecode, uint8_t, f->memcat);
luaM_freegco(L, f, sizeof(Proto), f->memcat, page);
}
void luaF_freeclosure(lua_State* L, Closure* c, lua_Page* page)
{
int size = c->isC ? sizeCclosure(c->nupvalues) : sizeLclosure(c->nupvalues);
luaM_freegco(L, c, size, c->memcat, page);
}
const LocVar* luaF_getlocal(const Proto* f, int local_number, int pc)
{
int i;
for (i = 0; i < f->sizelocvars; i++)
{
if (pc >= f->locvars[i].startpc && pc < f->locvars[i].endpc)
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{ // is variable active?
local_number--;
if (local_number == 0)
return &f->locvars[i];
}
}
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return NULL; // not found
}