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Minor cleanup of trace event handling.

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This commit is contained in:
Mike Pall
2010-02-15 16:41:52 +01:00
parent 1288e04186
commit b838cd8dca
5 changed files with 33 additions and 37 deletions
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55
src/lj_trace.c
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@@ -532,46 +532,52 @@ static TValue *trace_state(lua_State *L, lua_CFunction dummy, void *ud)
/* -- Event handling ------------------------------------------------------ */
/* A bytecode instruction is about to be executed. Record it. */
void lj_trace_ins(jit_State *J)
void lj_trace_ins(jit_State *J, const BCIns *pc)
{
while (lj_vm_cpcall(J->L, NULL, (void *)J, trace_state) != 0)
J->state = LJ_TRACE_ERR;
}
/* Start recording a new trace. */
static void trace_new(jit_State *J)
{
lua_assert(J->state == LJ_TRACE_IDLE);
J->state = LJ_TRACE_START;
/* Note: J->L must already be set. pc is the true bytecode PC here. */
J->pc = pc;
J->fn = curr_func(J->L);
J->pt = funcproto(J->fn);
lj_trace_ins(J);
while (lj_vm_cpcall(J->L, NULL, (void *)J, trace_state) != 0)
J->state = LJ_TRACE_ERR;
}
/* A hotcount triggered. Start recording a root trace. */
void LJ_FASTCALL lj_trace_hot(jit_State *J, const BCIns *pc)
{
/* Note: pc is the interpreter bytecode PC here. It's offset by 1. */
hotcount_set(J2GG(J), pc, J->param[JIT_P_hotloop]+1); /* Reset hotcount. */
/* Only start a new trace if not recording or inside __gc call or vmevent. */
if (J->state == LJ_TRACE_IDLE &&
!(J2G(J)->hookmask & (HOOK_GC|HOOK_VMEVENT))) {
J->parent = 0; /* Root trace. */
J->exitno = 0;
J->pc = pc-1; /* The interpreter bytecode PC is offset by 1. */
trace_new(J);
J->state = LJ_TRACE_START;
lj_trace_ins(J, pc-1);
}
}
/* A trace exited. Restore interpreter state and check for hot exits. */
/* Check for a hot side exit. If yes, start recording a side trace. */
static void trace_hotside(jit_State *J, const BCIns *pc)
{
SnapShot *snap = &J->trace[J->parent]->snap[J->exitno];
if (!(J2G(J)->hookmask & (HOOK_GC|HOOK_VMEVENT)) &&
snap->count != SNAPCOUNT_DONE &&
++snap->count >= J->param[JIT_P_hotexit]) {
lua_assert(J->state == LJ_TRACE_IDLE);
/* J->parent is non-zero for a side trace. */
J->state = LJ_TRACE_START;
lj_trace_ins(J, pc);
}
}
/* A trace exited. Restore interpreter state. */
void * LJ_FASTCALL lj_trace_exit(jit_State *J, void *exptr)
{
const BCIns *pc = lj_snap_restore(J, exptr);
lua_State *L = J->L;
void *cf;
/* Restore interpreter state. */
lj_snap_restore(J, exptr);
cf = cframe_raw(L->cframe);
setcframe_pc(cf, J->pc);
void *cf = cframe_raw(L->cframe);
setcframe_pc(cf, pc); /* Restart interpreter at this PC. */
lj_vmevent_send(L, TEXIT,
ExitState *ex = (ExitState *)exptr;
@@ -591,14 +597,7 @@ void * LJ_FASTCALL lj_trace_exit(jit_State *J, void *exptr)
}
);
{ /* Check for a hot exit. */
SnapShot *snap = &J->trace[J->parent]->snap[J->exitno];
if (!(J2G(J)->hookmask & (HOOK_GC|HOOK_VMEVENT)) &&
snap->count != SNAPCOUNT_DONE &&
++snap->count >= J->param[JIT_P_hotexit])
trace_new(J); /* Start recording a side trace. */
}
trace_hotside(J, pc);
return cf; /* Return the interpreter C frame. */
}