void addDbgGuardImpl(SrcKey sk, SrcRec* sr) {
TCA realCode = sr->getTopTranslation();
if (!realCode) return; // No translations, nothing to do.
auto& cb = mcg->code.main();
auto const dbgGuard = vwrap(cb, [&] (Vout& v) {
if (!sk.resumed()) {
auto const off = sr->nonResumedSPOff();
v << lea{rvmfp()[-cellsToBytes(off.offset)], rvmsp()};
}
auto const tinfo = v.makeReg();
auto const attached = v.makeReg();
auto const sf = v.makeReg();
auto const done = v.makeBlock();
constexpr size_t dbgOff =
offsetof(ThreadInfo, m_reqInjectionData) +
RequestInjectionData::debuggerReadOnlyOffset();
v << ldimmq{reinterpret_cast<uintptr_t>(sk.pc()), rarg(0)};
emitTLSLoad(v, tls_datum(ThreadInfo::s_threadInfo), tinfo);
v << loadb{tinfo[dbgOff], attached};
v << testbi{static_cast<int8_t>(0xffu), attached, sf};
v << jcci{CC_NZ, sf, done, mcg->ustubs().interpHelper};
v = done;
v << fallthru{};
}, CodeKind::Helper);
// Emit a jump to the actual code.
auto const dbgBranchGuardSrc = emitSmashableJmp(cb, realCode);
// Add the guard to the SrcRec.
sr->addDebuggerGuard(dbgGuard, dbgBranchGuardSrc);
}
bool emit(Venv& env, const fallback& i) {
auto const jmp = emitSmashableJmp(*env.cb, env.meta, env.cb->frontier());
env.stubs.push_back({jmp, nullptr, i});
registerFallbackJump(env, jmp, CC_None);
return true;
}
bool emit(Venv& env, const bindjmp& i) {
auto const jmp = emitSmashableJmp(*env.cb, env.meta, env.cb->frontier());
env.stubs.push_back({jmp, nullptr, i});
setJmpTransID(env, jmp);
return true;
}
bool emit(Venv& env, const fallback& i) {
auto const jmp = emitSmashableJmp(*env.cb, env.meta, env.cb->frontier());
env.stubs.push_back({jmp, nullptr, i});
mcg->tx().getSrcRec(i.target)->registerFallbackJump(jmp, CC_None, env.meta);
return true;
}
void Vgen::emit(jmp i) {
if (next == i.target) return;
jmps.push_back({a->frontier(), i.target});
// B range is +/- 128MB but this uses BR
emitSmashableJmp(*codeBlock, env.meta, kEndOfTargetChain);
}
