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Aegisub/subprojects/luajit/src/lj_dispatch.c

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/*
** Instruction dispatch handling.
** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
*/
#define lj_dispatch_c
#define LUA_CORE
#include "lj_obj.h"
#include "lj_err.h"
#include "lj_func.h"
#include "lj_str.h"
#include "lj_tab.h"
#include "lj_meta.h"
#include "lj_debug.h"
#include "lj_state.h"
#include "lj_frame.h"
#include "lj_bc.h"
#include "lj_ff.h"
#if LJ_HASJIT
#include "lj_jit.h"
#endif
#if LJ_HASFFI
#include "lj_ccallback.h"
#endif
#include "lj_trace.h"
#include "lj_dispatch.h"
#include "lj_vm.h"
#include "luajit.h"
/* Bump GG_NUM_ASMFF in lj_dispatch.h as needed. Ugly. */
LJ_STATIC_ASSERT(GG_NUM_ASMFF == FF_NUM_ASMFUNC);
/* -- Dispatch table management ------------------------------------------- */
#if LJ_TARGET_MIPS
#include <math.h>
LJ_FUNCA_NORET void LJ_FASTCALL lj_ffh_coroutine_wrap_err(lua_State *L,
lua_State *co);
#define GOTFUNC(name) (ASMFunction)name,
static const ASMFunction dispatch_got[] = {
GOTDEF(GOTFUNC)
};
#undef GOTFUNC
#endif
/* Initialize instruction dispatch table and hot counters. */
void lj_dispatch_init(GG_State *GG)
{
uint32_t i;
ASMFunction *disp = GG->dispatch;
for (i = 0; i < GG_LEN_SDISP; i++)
disp[GG_LEN_DDISP+i] = disp[i] = makeasmfunc(lj_bc_ofs[i]);
for (i = GG_LEN_SDISP; i < GG_LEN_DDISP; i++)
disp[i] = makeasmfunc(lj_bc_ofs[i]);
/* The JIT engine is off by default. luaopen_jit() turns it on. */
disp[BC_FORL] = disp[BC_IFORL];
disp[BC_ITERL] = disp[BC_IITERL];
disp[BC_LOOP] = disp[BC_ILOOP];
disp[BC_FUNCF] = disp[BC_IFUNCF];
disp[BC_FUNCV] = disp[BC_IFUNCV];
GG->g.bc_cfunc_ext = GG->g.bc_cfunc_int = BCINS_AD(BC_FUNCC, LUA_MINSTACK, 0);
for (i = 0; i < GG_NUM_ASMFF; i++)
GG->bcff[i] = BCINS_AD(BC__MAX+i, 0, 0);
#if LJ_TARGET_MIPS
memcpy(GG->got, dispatch_got, LJ_GOT__MAX*4);
#endif
}
#if LJ_HASJIT
/* Initialize hotcount table. */
void lj_dispatch_init_hotcount(global_State *g)
{
int32_t hotloop = G2J(g)->param[JIT_P_hotloop];
HotCount start = (HotCount)(hotloop*HOTCOUNT_LOOP - 1);
HotCount *hotcount = G2GG(g)->hotcount;
uint32_t i;
for (i = 0; i < HOTCOUNT_SIZE; i++)
hotcount[i] = start;
}
#endif
/* Internal dispatch mode bits. */
#define DISPMODE_JIT 0x01 /* JIT compiler on. */
#define DISPMODE_REC 0x02 /* Recording active. */
#define DISPMODE_INS 0x04 /* Override instruction dispatch. */
#define DISPMODE_CALL 0x08 /* Override call dispatch. */
#define DISPMODE_RET 0x10 /* Override return dispatch. */
/* Update dispatch table depending on various flags. */
void lj_dispatch_update(global_State *g)
{
uint8_t oldmode = g->dispatchmode;
uint8_t mode = 0;
#if LJ_HASJIT
mode |= (G2J(g)->flags & JIT_F_ON) ? DISPMODE_JIT : 0;
mode |= G2J(g)->state != LJ_TRACE_IDLE ?
(DISPMODE_REC|DISPMODE_INS|DISPMODE_CALL) : 0;
#endif
mode |= (g->hookmask & (LUA_MASKLINE|LUA_MASKCOUNT)) ? DISPMODE_INS : 0;
mode |= (g->hookmask & LUA_MASKCALL) ? DISPMODE_CALL : 0;
mode |= (g->hookmask & LUA_MASKRET) ? DISPMODE_RET : 0;
if (oldmode != mode) { /* Mode changed? */
ASMFunction *disp = G2GG(g)->dispatch;
ASMFunction f_forl, f_iterl, f_loop, f_funcf, f_funcv;
g->dispatchmode = mode;
/* Hotcount if JIT is on, but not while recording. */
if ((mode & (DISPMODE_JIT|DISPMODE_REC)) == DISPMODE_JIT) {
f_forl = makeasmfunc(lj_bc_ofs[BC_FORL]);
f_iterl = makeasmfunc(lj_bc_ofs[BC_ITERL]);
f_loop = makeasmfunc(lj_bc_ofs[BC_LOOP]);
f_funcf = makeasmfunc(lj_bc_ofs[BC_FUNCF]);
f_funcv = makeasmfunc(lj_bc_ofs[BC_FUNCV]);
} else { /* Otherwise use the non-hotcounting instructions. */
f_forl = disp[GG_LEN_DDISP+BC_IFORL];
f_iterl = disp[GG_LEN_DDISP+BC_IITERL];
f_loop = disp[GG_LEN_DDISP+BC_ILOOP];
f_funcf = makeasmfunc(lj_bc_ofs[BC_IFUNCF]);
f_funcv = makeasmfunc(lj_bc_ofs[BC_IFUNCV]);
}
/* Init static counting instruction dispatch first (may be copied below). */
disp[GG_LEN_DDISP+BC_FORL] = f_forl;
disp[GG_LEN_DDISP+BC_ITERL] = f_iterl;
disp[GG_LEN_DDISP+BC_LOOP] = f_loop;
/* Set dynamic instruction dispatch. */
if ((oldmode ^ mode) & (DISPMODE_REC|DISPMODE_INS)) {
/* Need to update the whole table. */
if (!(mode & (DISPMODE_REC|DISPMODE_INS))) { /* No ins dispatch? */
/* Copy static dispatch table to dynamic dispatch table. */
memcpy(&disp[0], &disp[GG_LEN_DDISP], GG_LEN_SDISP*sizeof(ASMFunction));
/* Overwrite with dynamic return dispatch. */
if ((mode & DISPMODE_RET)) {
disp[BC_RETM] = lj_vm_rethook;
disp[BC_RET] = lj_vm_rethook;
disp[BC_RET0] = lj_vm_rethook;
disp[BC_RET1] = lj_vm_rethook;
}
} else {
/* The recording dispatch also checks for hooks. */
ASMFunction f = (mode & DISPMODE_REC) ? lj_vm_record : lj_vm_inshook;
uint32_t i;
for (i = 0; i < GG_LEN_SDISP; i++)
disp[i] = f;
}
} else if (!(mode & (DISPMODE_REC|DISPMODE_INS))) {
/* Otherwise set dynamic counting ins. */
disp[BC_FORL] = f_forl;
disp[BC_ITERL] = f_iterl;
disp[BC_LOOP] = f_loop;
/* Set dynamic return dispatch. */
if ((mode & DISPMODE_RET)) {
disp[BC_RETM] = lj_vm_rethook;
disp[BC_RET] = lj_vm_rethook;
disp[BC_RET0] = lj_vm_rethook;
disp[BC_RET1] = lj_vm_rethook;
} else {
disp[BC_RETM] = disp[GG_LEN_DDISP+BC_RETM];
disp[BC_RET] = disp[GG_LEN_DDISP+BC_RET];
disp[BC_RET0] = disp[GG_LEN_DDISP+BC_RET0];
disp[BC_RET1] = disp[GG_LEN_DDISP+BC_RET1];
}
}
/* Set dynamic call dispatch. */
if ((oldmode ^ mode) & DISPMODE_CALL) { /* Update the whole table? */
uint32_t i;
if ((mode & DISPMODE_CALL) == 0) { /* No call hooks? */
for (i = GG_LEN_SDISP; i < GG_LEN_DDISP; i++)
disp[i] = makeasmfunc(lj_bc_ofs[i]);
} else {
for (i = GG_LEN_SDISP; i < GG_LEN_DDISP; i++)
disp[i] = lj_vm_callhook;
}
}
if (!(mode & DISPMODE_CALL)) { /* Overwrite dynamic counting ins. */
disp[BC_FUNCF] = f_funcf;
disp[BC_FUNCV] = f_funcv;
}
#if LJ_HASJIT
/* Reset hotcounts for JIT off to on transition. */
if ((mode & DISPMODE_JIT) && !(oldmode & DISPMODE_JIT))
lj_dispatch_init_hotcount(g);
#endif
}
}
/* -- JIT mode setting ---------------------------------------------------- */
#if LJ_HASJIT
/* Set JIT mode for a single prototype. */
static void setptmode(global_State *g, GCproto *pt, int mode)
{
if ((mode & LUAJIT_MODE_ON)) { /* (Re-)enable JIT compilation. */
pt->flags &= ~PROTO_NOJIT;
lj_trace_reenableproto(pt); /* Unpatch all ILOOP etc. bytecodes. */
} else { /* Flush and/or disable JIT compilation. */
if (!(mode & LUAJIT_MODE_FLUSH))
pt->flags |= PROTO_NOJIT;
lj_trace_flushproto(g, pt); /* Flush all traces of prototype. */
}
}
/* Recursively set the JIT mode for all children of a prototype. */
static void setptmode_all(global_State *g, GCproto *pt, int mode)
{
ptrdiff_t i;
if (!(pt->flags & PROTO_CHILD)) return;
for (i = -(ptrdiff_t)pt->sizekgc; i < 0; i++) {
GCobj *o = proto_kgc(pt, i);
if (o->gch.gct == ~LJ_TPROTO) {
setptmode(g, gco2pt(o), mode);
setptmode_all(g, gco2pt(o), mode);
}
}
}
#endif
/* Public API function: control the JIT engine. */
int luaJIT_setmode(lua_State *L, int idx, int mode)
{
global_State *g = G(L);
int mm = mode & LUAJIT_MODE_MASK;
lj_trace_abort(g); /* Abort recording on any state change. */
/* Avoid pulling the rug from under our own feet. */
if ((g->hookmask & HOOK_GC))
lj_err_caller(L, LJ_ERR_NOGCMM);
switch (mm) {
#if LJ_HASJIT
case LUAJIT_MODE_ENGINE:
if ((mode & LUAJIT_MODE_FLUSH)) {
lj_trace_flushall(L);
} else {
if (!(mode & LUAJIT_MODE_ON))
G2J(g)->flags &= ~(uint32_t)JIT_F_ON;
#if LJ_TARGET_X86ORX64
else if ((G2J(g)->flags & JIT_F_SSE2))
G2J(g)->flags |= (uint32_t)JIT_F_ON;
else
return 0; /* Don't turn on JIT compiler without SSE2 support. */
#else
else
G2J(g)->flags |= (uint32_t)JIT_F_ON;
#endif
lj_dispatch_update(g);
}
break;
case LUAJIT_MODE_FUNC:
case LUAJIT_MODE_ALLFUNC:
case LUAJIT_MODE_ALLSUBFUNC: {
cTValue *tv = idx == 0 ? frame_prev(L->base-1) :
idx > 0 ? L->base + (idx-1) : L->top + idx;
GCproto *pt;
if ((idx == 0 || tvisfunc(tv)) && isluafunc(&gcval(tv)->fn))
pt = funcproto(&gcval(tv)->fn); /* Cannot use funcV() for frame slot. */
else if (tvisproto(tv))
pt = protoV(tv);
else
return 0; /* Failed. */
if (mm != LUAJIT_MODE_ALLSUBFUNC)
setptmode(g, pt, mode);
if (mm != LUAJIT_MODE_FUNC)
setptmode_all(g, pt, mode);
break;
}
case LUAJIT_MODE_TRACE:
if (!(mode & LUAJIT_MODE_FLUSH))
return 0; /* Failed. */
lj_trace_flush(G2J(g), idx);
break;
#else
case LUAJIT_MODE_ENGINE:
case LUAJIT_MODE_FUNC:
case LUAJIT_MODE_ALLFUNC:
case LUAJIT_MODE_ALLSUBFUNC:
UNUSED(idx);
if ((mode & LUAJIT_MODE_ON))
return 0; /* Failed. */
break;
#endif
case LUAJIT_MODE_WRAPCFUNC:
if ((mode & LUAJIT_MODE_ON)) {
if (idx != 0) {
cTValue *tv = idx > 0 ? L->base + (idx-1) : L->top + idx;
if (tvislightud(tv))
g->wrapf = (lua_CFunction)lightudV(tv);
else
return 0; /* Failed. */
} else {
return 0; /* Failed. */
}
g->bc_cfunc_ext = BCINS_AD(BC_FUNCCW, 0, 0);
} else {
g->bc_cfunc_ext = BCINS_AD(BC_FUNCC, 0, 0);
}
break;
default:
return 0; /* Failed. */
}
return 1; /* OK. */
}
/* Enforce (dynamic) linker error for version mismatches. See luajit.c. */
LUA_API void LUAJIT_VERSION_SYM(void)
{
}
/* -- Hooks --------------------------------------------------------------- */
/* This function can be called asynchronously (e.g. during a signal). */
LUA_API int lua_sethook(lua_State *L, lua_Hook func, int mask, int count)
{
global_State *g = G(L);
mask &= HOOK_EVENTMASK;
if (func == NULL || mask == 0) { mask = 0; func = NULL; } /* Consistency. */
g->hookf = func;
g->hookcount = g->hookcstart = (int32_t)count;
g->hookmask = (uint8_t)((g->hookmask & ~HOOK_EVENTMASK) | mask);
lj_trace_abort(g); /* Abort recording on any hook change. */
lj_dispatch_update(g);
return 1;
}
LUA_API lua_Hook lua_gethook(lua_State *L)
{
return G(L)->hookf;
}
LUA_API int lua_gethookmask(lua_State *L)
{
return G(L)->hookmask & HOOK_EVENTMASK;
}
LUA_API int lua_gethookcount(lua_State *L)
{
return (int)G(L)->hookcstart;
}
/* Call a hook. */
static void callhook(lua_State *L, int event, BCLine line)
{
global_State *g = G(L);
lua_Hook hookf = g->hookf;
if (hookf && !hook_active(g)) {
lua_Debug ar;
lj_trace_abort(g); /* Abort recording on any hook call. */
ar.event = event;
ar.currentline = line;
/* Top frame, nextframe = NULL. */
ar.i_ci = (int)((L->base-1) - tvref(L->stack));
lj_state_checkstack(L, 1+LUA_MINSTACK);
hook_enter(g);
hookf(L, &ar);
lua_assert(hook_active(g));
hook_leave(g);
}
}
/* -- Dispatch callbacks -------------------------------------------------- */
/* Calculate number of used stack slots in the current frame. */
static BCReg cur_topslot(GCproto *pt, const BCIns *pc, uint32_t nres)
{
BCIns ins = pc[-1];
if (bc_op(ins) == BC_UCLO)
ins = pc[bc_j(ins)];
switch (bc_op(ins)) {
case BC_CALLM: case BC_CALLMT: return bc_a(ins) + bc_c(ins) + nres-1+1;
case BC_RETM: return bc_a(ins) + bc_d(ins) + nres-1;
case BC_TSETM: return bc_a(ins) + nres-1;
default: return pt->framesize;
}
}
/* Instruction dispatch. Used by instr/line/return hooks or when recording. */
void LJ_FASTCALL lj_dispatch_ins(lua_State *L, const BCIns *pc)
{
ERRNO_SAVE
GCfunc *fn = curr_func(L);
GCproto *pt = funcproto(fn);
void *cf = cframe_raw(L->cframe);
const BCIns *oldpc = cframe_pc(cf);
global_State *g = G(L);
BCReg slots;
setcframe_pc(cf, pc);
slots = cur_topslot(pt, pc, cframe_multres_n(cf));
L->top = L->base + slots; /* Fix top. */
#if LJ_HASJIT
{
jit_State *J = G2J(g);
if (J->state != LJ_TRACE_IDLE) {
#ifdef LUA_USE_ASSERT
ptrdiff_t delta = L->top - L->base;
#endif
J->L = L;
lj_trace_ins(J, pc-1); /* The interpreter bytecode PC is offset by 1. */
lua_assert(L->top - L->base == delta);
}
}
#endif
if ((g->hookmask & LUA_MASKCOUNT) && g->hookcount == 0) {
g->hookcount = g->hookcstart;
callhook(L, LUA_HOOKCOUNT, -1);
L->top = L->base + slots; /* Fix top again. */
}
if ((g->hookmask & LUA_MASKLINE)) {
BCPos npc = proto_bcpos(pt, pc) - 1;
BCPos opc = proto_bcpos(pt, oldpc) - 1;
BCLine line = lj_debug_line(pt, npc);
if (pc <= oldpc || opc >= pt->sizebc || line != lj_debug_line(pt, opc)) {
callhook(L, LUA_HOOKLINE, line);
L->top = L->base + slots; /* Fix top again. */
}
}
if ((g->hookmask & LUA_MASKRET) && bc_isret(bc_op(pc[-1])))
callhook(L, LUA_HOOKRET, -1);
ERRNO_RESTORE
}
/* Initialize call. Ensure stack space and return # of missing parameters. */
static int call_init(lua_State *L, GCfunc *fn)
{
if (isluafunc(fn)) {
GCproto *pt = funcproto(fn);
int numparams = pt->numparams;
int gotparams = (int)(L->top - L->base);
int need = pt->framesize;
if ((pt->flags & PROTO_VARARG)) need += 1+gotparams;
lj_state_checkstack(L, (MSize)need);
numparams -= gotparams;
return numparams >= 0 ? numparams : 0;
} else {
lj_state_checkstack(L, LUA_MINSTACK);
return 0;
}
}
/* Call dispatch. Used by call hooks, hot calls or when recording. */
ASMFunction LJ_FASTCALL lj_dispatch_call(lua_State *L, const BCIns *pc)
{
ERRNO_SAVE
GCfunc *fn = curr_func(L);
BCOp op;
global_State *g = G(L);
#if LJ_HASJIT
jit_State *J = G2J(g);
#endif
int missing = call_init(L, fn);
#if LJ_HASJIT
J->L = L;
if ((uintptr_t)pc & 1) { /* Marker for hot call. */
#ifdef LUA_USE_ASSERT
ptrdiff_t delta = L->top - L->base;
#endif
pc = (const BCIns *)((uintptr_t)pc & ~(uintptr_t)1);
lj_trace_hot(J, pc);
lua_assert(L->top - L->base == delta);
goto out;
} else if (J->state != LJ_TRACE_IDLE &&
!(g->hookmask & (HOOK_GC|HOOK_VMEVENT))) {
#ifdef LUA_USE_ASSERT
ptrdiff_t delta = L->top - L->base;
#endif
/* Record the FUNC* bytecodes, too. */
lj_trace_ins(J, pc-1); /* The interpreter bytecode PC is offset by 1. */
lua_assert(L->top - L->base == delta);
}
#endif
if ((g->hookmask & LUA_MASKCALL)) {
int i;
for (i = 0; i < missing; i++) /* Add missing parameters. */
setnilV(L->top++);
callhook(L, LUA_HOOKCALL, -1);
/* Preserve modifications of missing parameters by lua_setlocal(). */
while (missing-- > 0 && tvisnil(L->top - 1))
L->top--;
}
#if LJ_HASJIT
out:
#endif
op = bc_op(pc[-1]); /* Get FUNC* op. */
#if LJ_HASJIT
/* Use the non-hotcounting variants if JIT is off or while recording. */
if ((!(J->flags & JIT_F_ON) || J->state != LJ_TRACE_IDLE) &&
(op == BC_FUNCF || op == BC_FUNCV))
op = (BCOp)((int)op+(int)BC_IFUNCF-(int)BC_FUNCF);
#endif
ERRNO_RESTORE
return makeasmfunc(lj_bc_ofs[op]); /* Return static dispatch target. */
}
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