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PPC: Add support for per-trace exit stubs.

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This commit is contained in:
Mike Pall
2011-10-24 16:13:12 +02:00
parent a0d7827554
commit cb1dd159e3
3 changed files with 40 additions and 6 deletions
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14
src/lib_jit.c
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@@ -377,15 +377,27 @@ LJLIB_CF(jit_util_tracemc)
return 0;
}
/* local addr = jit.util.traceexitstub(idx) */
/* local addr = jit.util.traceexitstub([tr,] exitno) */
LJLIB_CF(jit_util_traceexitstub)
{
#ifdef EXITSTUBS_PER_GROUP
ExitNo exitno = (ExitNo)lj_lib_checkint(L, 1);
jit_State *J = L2J(L);
if (exitno < EXITSTUBS_PER_GROUP*LJ_MAX_EXITSTUBGR) {
setintptrV(L->top-1, (intptr_t)(void *)exitstub_addr(J, exitno));
return 1;
}
#else
if (L->top > L->base+1) { /* Don't throw for one-argument variant. */
GCtrace *T = jit_checktrace(L);
ExitNo exitno = (ExitNo)lj_lib_checkint(L, 2);
ExitNo maxexit = T->root ? T->nsnap+1 : T->nsnap;
if (T && T->mcode != NULL && exitno < maxexit) {
setintptrV(L->top-1, (intptr_t)(void *)exitstub_trace_addr(T, exitno));
return 1;
}
}
#endif
return 0;
}

2
src/lj_target.h
View File

@@ -131,6 +131,7 @@ typedef uint32_t RegCost;
#error "Missing include for target CPU"
#endif
#ifdef EXITSTUBS_PER_GROUP
/* Return the address of an exit stub. */
static LJ_AINLINE MCode *exitstub_addr(jit_State *J, ExitNo exitno)
{
@@ -138,5 +139,6 @@ static LJ_AINLINE MCode *exitstub_addr(jit_State *J, ExitNo exitno)
return (MCode *)((char *)J->exitstubgroup[exitno / EXITSTUBS_PER_GROUP] +
EXITSTUB_SPACING*(exitno % EXITSTUBS_PER_GROUP));
}
#endif
#endif