void cgCheckSurpriseAndStack(IRLS& env, const IRInstruction* inst) {
auto const fp = srcLoc(env, inst, 0).reg();
auto const extra = inst->extra<CheckSurpriseAndStack>();
auto const func = extra->func;
auto const off = func->getEntryForNumArgs(extra->argc) - func->base();
auto const fixup = Fixup(off, func->numSlotsInFrame());
auto& v = vmain(env);
auto const sf = v.makeReg();
auto const needed_top = v.makeReg();
v << lea{fp[-cellsToBytes(func->maxStackCells())], needed_top};
v << cmpqm{needed_top, rvmtl()[rds::kSurpriseFlagsOff], sf};
unlikelyIfThen(v, vcold(env), CC_AE, sf, [&] (Vout& v) {
auto const stub = tc::ustubs().functionSurprisedOrStackOverflow;
auto const done = v.makeBlock();
v << vinvoke{CallSpec::stub(stub), v.makeVcallArgs({}), v.makeTuple({}),
{done, label(env, inst->taken())}, fixup };
v = done;
});
}
bool RegionFormer::tryInline(uint32_t& instrSize) {
assertx(m_inst.source == m_sk);
assertx(m_inst.func() == curFunc());
assertx(m_sk.resumed() == resumed());
instrSize = 0;
if (!m_inl.canInlineAt(m_inst.source, m_inst.funcd, *m_region)) {
return false;
}
auto refuse = [this](const std::string& str) {
FTRACE(2, "selectTracelet not inlining {}: {}\n",
m_inst.toString(), str);
return false;
};
auto callee = m_inst.funcd;
// Make sure the FPushOp wasn't interpreted.
if (m_irgs.fpiStack.empty()) {
return refuse("fpistack empty; fpush was in a different region");
}
auto spillFrame = m_irgs.fpiStack.top().spillFrame;
if (!spillFrame) {
return refuse("couldn't find SpillFrame for FPushOp");
}
auto numArgs = m_inst.imm[0].u_IVA;
auto numParams = callee->numParams();
// Set up the region context, mapping stack slots in the caller to locals in
// the callee.
RegionContext ctx;
ctx.func = callee;
ctx.bcOffset = callee->getEntryForNumArgs(numArgs);
ctx.spOffset = FPInvOffset{safe_cast<int32_t>(callee->numSlotsInFrame())};
ctx.resumed = false;
for (int i = 0; i < numArgs; ++i) {
auto type = irgen::publicTopType(m_irgs, BCSPOffset{i});
uint32_t paramIdx = numArgs - 1 - i;
ctx.liveTypes.push_back({RegionDesc::Location::Local{paramIdx}, type});
}
for (unsigned i = numArgs; i < numParams; ++i) {
// These locals will be populated by DV init funclets but they'll start
// out as Uninit.
ctx.liveTypes.push_back({RegionDesc::Location::Local{i}, TUninit});
}
FTRACE(1, "selectTracelet analyzing callee {} with context:\n{}",
callee->fullName()->data(), show(ctx));
auto region = selectTracelet(ctx, m_profiling, false /* noinline */);
if (!region) {
return refuse("failed to select region in callee");
}
instrSize = region->instrSize();
auto newInstrSize = instrSize + m_numBCInstrs + m_pendingInlinedInstrs;
if (newInstrSize > RuntimeOption::EvalJitMaxRegionInstrs) {
return refuse("new region would be too large");
}
if (!m_inl.shouldInline(callee, *region)) {
return refuse("shouldIRInline failed");
}
return true;
}
