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Add trace recorder infrastructure for instruction post-processing.

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This commit is contained in:
Mike Pall
2011-01-17 01:20:10 +01:00
parent b2ff889c6e
commit 66ba1e68aa
3 changed files with 32 additions and 1 deletions
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20
src/lj_record.c
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@@ -1365,6 +1365,26 @@ void lj_record_ins(jit_State *J)
BCOp op;
TRef ra, rb, rc;
/* Perform post-processing action before recording the next instruction. */
if (LJ_UNLIKELY(J->postproc != LJ_POST_NONE)) {
switch (J->postproc) {
case LJ_POST_FIXGUARD: /* Fixup and emit pending guard. */
if (!tvistruecond(&J2G(J)->tmptv2)) {
BCReg s;
J->fold.ins.o ^= 1; /* Flip guard to opposite. */
for (s = 0; s < J->maxslot; s++) /* Fixup stack slot (if any). */
if (J->base[s] == TREF_TRUE && tvisfalse(&J->L->base[s])) {
J->base[s] = TREF_FALSE;
break;
}
}
lj_opt_fold(J); /* Emit pending guard. */
break;
default: lua_assert(0); break;
}
J->postproc = LJ_POST_NONE;
}
/* Need snapshot before recording next bytecode (e.g. after a store). */
if (J->needsnap) {
J->needsnap = 0;