void MCELFStreamer::EmitInstToData(const MCInst &Inst,
const MCSubtargetInfo &STI) {
MCAssembler &Assembler = getAssembler();
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
Assembler.getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
VecOS.flush();
for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
fixSymbolsInTLSFixups(Fixups[i].getValue());
// There are several possibilities here:
//
// If bundling is disabled, append the encoded instruction to the current data
// fragment (or create a new such fragment if the current fragment is not a
// data fragment).
//
// If bundling is enabled:
// - If we're not in a bundle-locked group, emit the instruction into a
// fragment of its own. If there are no fixups registered for the
// instruction, emit a MCCompactEncodedInstFragment. Otherwise, emit a
// MCDataFragment.
// - If we're in a bundle-locked group, append the instruction to the current
// data fragment because we want all the instructions in a group to get into
// the same fragment. Be careful not to do that for the first instruction in
// the group, though.
MCDataFragment *DF;
if (Assembler.isBundlingEnabled()) {
MCSection &Sec = *getCurrentSectionOnly();
if (Assembler.getRelaxAll() && isBundleLocked())
// If the -mc-relax-all flag is used and we are bundle-locked, we re-use
// the current bundle group.
DF = BundleGroups.back();
else if (Assembler.getRelaxAll() && !isBundleLocked())
// When not in a bundle-locked group and the -mc-relax-all flag is used,
// we create a new temporary fragment which will be later merged into
// the current fragment.
DF = new MCDataFragment();
else if (isBundleLocked() && !Sec.isBundleGroupBeforeFirstInst())
// If we are bundle-locked, we re-use the current fragment.
// The bundle-locking directive ensures this is a new data fragment.
DF = cast<MCDataFragment>(getCurrentFragment());
else if (!isBundleLocked() && Fixups.size() == 0) {
// Optimize memory usage by emitting the instruction to a
// MCCompactEncodedInstFragment when not in a bundle-locked group and
// there are no fixups registered.
MCCompactEncodedInstFragment *CEIF = new MCCompactEncodedInstFragment();
insert(CEIF);
CEIF->getContents().append(Code.begin(), Code.end());
return;
} else {
DF = new MCDataFragment();
insert(DF);
}
if (Sec.getBundleLockState() == MCSection::BundleLockedAlignToEnd) {
// If this fragment is for a group marked "align_to_end", set a flag
// in the fragment. This can happen after the fragment has already been
// created if there are nested bundle_align groups and an inner one
// is the one marked align_to_end.
DF->setAlignToBundleEnd(true);
}
// We're now emitting an instruction in a bundle group, so this flag has
// to be turned off.
Sec.setBundleGroupBeforeFirstInst(false);
} else {
DF = getOrCreateDataFragment();
}
// Add the fixups and data.
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
DF->getFixups().push_back(Fixups[i]);
}
DF->setHasInstructions(true);
DF->getContents().append(Code.begin(), Code.end());
if (Assembler.isBundlingEnabled() && Assembler.getRelaxAll()) {
if (!isBundleLocked()) {
mergeFragment(getOrCreateDataFragment(), DF);
delete DF;
}
}
}
void MCELFStreamer::EmitInstToData(const MCInst &Inst) {
MCAssembler &Assembler = getAssembler();
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
VecOS.flush();
for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
fixSymbolsInTLSFixups(Fixups[i].getValue());
// There are several possibilities here:
//
// If bundling is disabled, append the encoded instruction to the current data
// fragment (or create a new such fragment if the current fragment is not a
// data fragment).
//
// If bundling is enabled:
// - If we're not in a bundle-locked group, emit the instruction into a
// fragment of its own. If there are no fixups registered for the
// instruction, emit a MCCompactEncodedInstFragment. Otherwise, emit a
// MCDataFragment.
// - If we're in a bundle-locked group, append the instruction to the current
// data fragment because we want all the instructions in a group to get into
// the same fragment. Be careful not to do that for the first instruction in
// the group, though.
MCDataFragment *DF;
if (Assembler.isBundlingEnabled()) {
MCSectionData *SD = getCurrentSectionData();
if (SD->isBundleLocked() && !SD->isBundleGroupBeforeFirstInst())
// If we are bundle-locked, we re-use the current fragment.
// The bundle-locking directive ensures this is a new data fragment.
DF = cast<MCDataFragment>(getCurrentFragment());
else if (!SD->isBundleLocked() && Fixups.size() == 0) {
// Optimize memory usage by emitting the instruction to a
// MCCompactEncodedInstFragment when not in a bundle-locked group and
// there are no fixups registered.
MCCompactEncodedInstFragment *CEIF = new MCCompactEncodedInstFragment();
insert(CEIF);
CEIF->getContents().append(Code.begin(), Code.end());
return;
} else {
DF = new MCDataFragment();
insert(DF);
if (SD->getBundleLockState() == MCSectionData::BundleLockedAlignToEnd) {
// If this is a new fragment created for a bundle-locked group, and the
// group was marked as "align_to_end", set a flag in the fragment.
DF->setAlignToBundleEnd(true);
}
}
// We're now emitting an instruction in a bundle group, so this flag has
// to be turned off.
SD->setBundleGroupBeforeFirstInst(false);
} else {
DF = getOrCreateDataFragment();
}
// Add the fixups and data.
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
DF->getFixups().push_back(Fixups[i]);
}
DF->setHasInstructions(true);
DF->getContents().append(Code.begin(), Code.end());
}