void SrcRec::chainFrom(IncomingBranch br) {
assert(br.type() == IncomingBranch::Tag::ADDR ||
mcg->code.isValidCodeAddress(br.toSmash()));
TCA destAddr = getTopTranslation();
m_incomingBranches.push_back(br);
TRACE(1, "SrcRec(%p)::chainFrom %p -> %p (type %d); %zd incoming branches\n",
this,
br.toSmash(), destAddr, br.type(), m_incomingBranches.size());
br.patch(destAddr);
}
void SrcRec::patch(IncomingBranch branch, TCA dest) {
switch (branch.type()) {
case IncomingBranch::Tag::JMP: {
JIT::smashJmp(branch.toSmash(), dest);
break;
}
case IncomingBranch::Tag::JCC: {
JIT::smashJcc(branch.toSmash(), dest);
break;
}
case IncomingBranch::Tag::ADDR:
// Note that this effectively ignores a
atomic_release_store(reinterpret_cast<TCA*>(branch.toSmash()), dest);
}
}
void SrcRec::patch(IncomingBranch branch, TCA dest) {
switch (branch.type()) {
case IncomingBranch::Tag::JMP: {
JIT::smashJmp(branch.toSmash(), dest);
break;
}
case IncomingBranch::Tag::JCC: {
JIT::smashJcc(branch.toSmash(), dest);
break;
}
case IncomingBranch::Tag::ADDR: {
// Note that this effectively ignores a
TCA* addr = reinterpret_cast<TCA*>(branch.toSmash());
assert_address_is_atomically_accessible(addr);
*addr = dest;
break;
}
}
}
void SrcRec::chainFrom(IncomingBranch br) {
assertx(br.type() == IncomingBranch::Tag::ADDR ||
tc::isValidCodeAddress(br.toSmash()));
TCA destAddr = getTopTranslation();
m_incomingBranches.push_back(br);
TRACE(1, "SrcRec(%p)::chainFrom %p -> %p (type %d); %zd incoming branches\n",
this,
br.toSmash(), destAddr, static_cast<int>(br.type()),
m_incomingBranches.size());
br.patch(destAddr);
if (RuntimeOption::EvalEnableReusableTC) {
tc::recordJump(br.toSmash(), this);
}
}
void SrcRec::patch(IncomingBranch branch, TCA dest) {
switch (branch.type()) {
case IncomingBranch::Tag::JMP: {
auto& a = tx64->getAsmFor(branch.toSmash());
CodeCursor cg(a, branch.toSmash());
TranslatorX64::smashJmp(a, branch.toSmash(), dest);
break;
}
case IncomingBranch::Tag::JCC: {
// patch destination, but preserve the condition code
int32_t delta = safe_cast<int32_t>((dest - branch.toSmash()) - kJmpccLen);
int32_t* addr = (int32_t*)(branch.toSmash() + kJmpccLen - 4);
atomic_release_store(addr, delta);
break;
}
case IncomingBranch::Tag::ADDR:
// Note that this effectively ignores a
atomic_release_store(reinterpret_cast<TCA*>(branch.toSmash()), dest);
}
}