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https://github.com/RPCS3/llvm-mirror.git
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remove the dwarf sizing stuff which is now dead, it was
"yet another" copy of the dwarf EH emission code that was copied, pasted and slightly hacked up. llvm-svn: 109169
This commit is contained in:
Chris Lattner
parent
7722724eee
commit
7c16f1a16e
@ -595,443 +595,3 @@ JITDwarfEmitter::EmitEHFrame(const Function* Personality,
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return StartEHPtr;
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}
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unsigned JITDwarfEmitter::GetDwarfTableSizeInBytes(MachineFunction& F,
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JITCodeEmitter& jce,
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unsigned char* StartFunction,
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unsigned char* EndFunction) {
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const TargetMachine& TM = F.getTarget();
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TD = TM.getTargetData();
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stackGrowthDirection = TM.getFrameInfo()->getStackGrowthDirection();
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RI = TM.getRegisterInfo();
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JCE = &jce;
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unsigned FinalSize = 0;
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FinalSize += GetExceptionTableSizeInBytes(&F);
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const std::vector<const Function *> Personalities = MMI->getPersonalities();
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FinalSize +=
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GetCommonEHFrameSizeInBytes(Personalities[MMI->getPersonalityIndex()]);
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FinalSize += GetEHFrameSizeInBytes(Personalities[MMI->getPersonalityIndex()],
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StartFunction);
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return FinalSize;
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}
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/// RoundUpToAlign - Add the specified alignment to FinalSize and returns
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/// the new value.
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static unsigned RoundUpToAlign(unsigned FinalSize, unsigned Alignment) {
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if (Alignment == 0) Alignment = 1;
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// Since we do not know where the buffer will be allocated, be pessimistic.
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return FinalSize + Alignment;
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}
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unsigned
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JITDwarfEmitter::GetEHFrameSizeInBytes(const Function* Personality,
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unsigned char* StartFunction) const {
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unsigned PointerSize = TD->getPointerSize();
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unsigned FinalSize = 0;
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// EH frame header.
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FinalSize += PointerSize;
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// FDE CIE Offset
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FinalSize += 3 * PointerSize;
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// If there is a personality and landing pads then point to the language
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// specific data area in the exception table.
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if (Personality) {
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FinalSize += MCAsmInfo::getULEB128Size(4);
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FinalSize += PointerSize;
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} else {
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FinalSize += MCAsmInfo::getULEB128Size(0);
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}
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// Indicate locations of function specific callee saved registers in
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// frame.
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FinalSize += GetFrameMovesSizeInBytes((intptr_t)StartFunction,
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MMI->getFrameMoves());
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FinalSize = RoundUpToAlign(FinalSize, 4);
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// Double zeroes for the unwind runtime
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FinalSize += 2 * PointerSize;
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return FinalSize;
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}
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unsigned JITDwarfEmitter::GetCommonEHFrameSizeInBytes(const Function* Personality)
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const {
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unsigned PointerSize = TD->getPointerSize();
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int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
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PointerSize : -PointerSize;
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unsigned FinalSize = 0;
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// EH Common Frame header
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FinalSize += PointerSize;
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FinalSize += 4;
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FinalSize += 1;
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FinalSize += Personality ? 5 : 3; // "zPLR" or "zR"
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FinalSize += MCAsmInfo::getULEB128Size(1);
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FinalSize += MCAsmInfo::getSLEB128Size(stackGrowth);
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FinalSize += 1;
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if (Personality) {
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FinalSize += MCAsmInfo::getULEB128Size(7);
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// Encoding
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FinalSize+= 1;
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//Personality
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FinalSize += PointerSize;
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FinalSize += MCAsmInfo::getULEB128Size(dwarf::DW_EH_PE_pcrel);
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FinalSize += MCAsmInfo::getULEB128Size(dwarf::DW_EH_PE_pcrel);
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} else {
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FinalSize += MCAsmInfo::getULEB128Size(1);
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FinalSize += MCAsmInfo::getULEB128Size(dwarf::DW_EH_PE_pcrel);
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}
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std::vector<MachineMove> Moves;
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RI->getInitialFrameState(Moves);
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FinalSize += GetFrameMovesSizeInBytes(0, Moves);
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FinalSize = RoundUpToAlign(FinalSize, 4);
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return FinalSize;
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}
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unsigned
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JITDwarfEmitter::GetFrameMovesSizeInBytes(intptr_t BaseLabelPtr,
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const std::vector<MachineMove> &Moves) const {
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unsigned PointerSize = TD->getPointerSize();
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int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
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PointerSize : -PointerSize;
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bool IsLocal = BaseLabelPtr;
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unsigned FinalSize = 0;
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for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
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const MachineMove &Move = Moves[i];
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MCSymbol *Label = Move.getLabel();
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// Throw out move if the label is invalid.
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if (Label && (*JCE->getLabelLocations())[Label] == 0)
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continue;
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intptr_t LabelPtr = 0;
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if (Label) LabelPtr = JCE->getLabelAddress(Label);
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const MachineLocation &Dst = Move.getDestination();
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const MachineLocation &Src = Move.getSource();
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// Advance row if new location.
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if (BaseLabelPtr && Label && (BaseLabelPtr != LabelPtr || !IsLocal)) {
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FinalSize++;
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FinalSize += PointerSize;
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BaseLabelPtr = LabelPtr;
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IsLocal = true;
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}
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// If advancing cfa.
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if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
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if (!Src.isReg()) {
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if (Src.getReg() == MachineLocation::VirtualFP) {
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++FinalSize;
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} else {
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++FinalSize;
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unsigned RegNum = RI->getDwarfRegNum(Src.getReg(), true);
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FinalSize += MCAsmInfo::getULEB128Size(RegNum);
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}
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int Offset = -Src.getOffset();
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FinalSize += MCAsmInfo::getULEB128Size(Offset);
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} else {
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llvm_unreachable("Machine move no supported yet.");
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}
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} else if (Src.isReg() &&
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Src.getReg() == MachineLocation::VirtualFP) {
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if (Dst.isReg()) {
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++FinalSize;
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unsigned RegNum = RI->getDwarfRegNum(Dst.getReg(), true);
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FinalSize += MCAsmInfo::getULEB128Size(RegNum);
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} else {
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llvm_unreachable("Machine move no supported yet.");
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}
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} else {
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unsigned Reg = RI->getDwarfRegNum(Src.getReg(), true);
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int Offset = Dst.getOffset() / stackGrowth;
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if (Offset < 0) {
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++FinalSize;
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FinalSize += MCAsmInfo::getULEB128Size(Reg);
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FinalSize += MCAsmInfo::getSLEB128Size(Offset);
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} else if (Reg < 64) {
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++FinalSize;
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FinalSize += MCAsmInfo::getULEB128Size(Offset);
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} else {
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++FinalSize;
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FinalSize += MCAsmInfo::getULEB128Size(Reg);
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FinalSize += MCAsmInfo::getULEB128Size(Offset);
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}
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}
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}
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return FinalSize;
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}
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unsigned
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JITDwarfEmitter::GetExceptionTableSizeInBytes(MachineFunction* MF) const {
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unsigned FinalSize = 0;
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// Map all labels and get rid of any dead landing pads.
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MMI->TidyLandingPads(JCE->getLabelLocations());
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const std::vector<const GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
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const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
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const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
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if (PadInfos.empty()) return 0;
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// Sort the landing pads in order of their type ids. This is used to fold
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// duplicate actions.
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SmallVector<const LandingPadInfo *, 64> LandingPads;
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LandingPads.reserve(PadInfos.size());
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for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
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LandingPads.push_back(&PadInfos[i]);
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std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
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// Negative type ids index into FilterIds, positive type ids index into
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// TypeInfos. The value written for a positive type id is just the type
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// id itself. For a negative type id, however, the value written is the
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// (negative) byte offset of the corresponding FilterIds entry. The byte
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// offset is usually equal to the type id, because the FilterIds entries
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// are written using a variable width encoding which outputs one byte per
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// entry as long as the value written is not too large, but can differ.
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// This kind of complication does not occur for positive type ids because
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// type infos are output using a fixed width encoding.
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// FilterOffsets[i] holds the byte offset corresponding to FilterIds[i].
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SmallVector<int, 16> FilterOffsets;
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FilterOffsets.reserve(FilterIds.size());
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int Offset = -1;
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for(std::vector<unsigned>::const_iterator I = FilterIds.begin(),
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E = FilterIds.end(); I != E; ++I) {
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FilterOffsets.push_back(Offset);
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Offset -= MCAsmInfo::getULEB128Size(*I);
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}
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// Compute the actions table and gather the first action index for each
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// landing pad site.
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SmallVector<ActionEntry, 32> Actions;
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SmallVector<unsigned, 64> FirstActions;
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FirstActions.reserve(LandingPads.size());
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int FirstAction = 0;
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unsigned SizeActions = 0;
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for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
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const LandingPadInfo *LP = LandingPads[i];
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const std::vector<int> &TypeIds = LP->TypeIds;
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const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0;
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unsigned SizeSiteActions = 0;
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if (NumShared < TypeIds.size()) {
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unsigned SizeAction = 0;
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ActionEntry *PrevAction = 0;
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if (NumShared) {
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const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size();
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assert(Actions.size());
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PrevAction = &Actions.back();
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SizeAction = MCAsmInfo::getSLEB128Size(PrevAction->NextAction) +
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MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
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for (unsigned j = NumShared; j != SizePrevIds; ++j) {
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SizeAction -= MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
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SizeAction += -PrevAction->NextAction;
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PrevAction = PrevAction->Previous;
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}
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}
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// Compute the actions.
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for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) {
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int TypeID = TypeIds[I];
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assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
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int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
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unsigned SizeTypeID = MCAsmInfo::getSLEB128Size(ValueForTypeID);
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int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
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SizeAction = SizeTypeID + MCAsmInfo::getSLEB128Size(NextAction);
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SizeSiteActions += SizeAction;
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ActionEntry Action = {ValueForTypeID, NextAction, PrevAction};
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Actions.push_back(Action);
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PrevAction = &Actions.back();
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}
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// Record the first action of the landing pad site.
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FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
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} // else identical - re-use previous FirstAction
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FirstActions.push_back(FirstAction);
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// Compute this sites contribution to size.
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SizeActions += SizeSiteActions;
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}
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// Compute the call-site table. Entries must be ordered by address.
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SmallVector<CallSiteEntry, 64> CallSites;
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RangeMapType PadMap;
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for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
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const LandingPadInfo *LandingPad = LandingPads[i];
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for (unsigned j=0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
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MCSymbol *BeginLabel = LandingPad->BeginLabels[j];
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assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
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PadRange P = { i, j };
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PadMap[BeginLabel] = P;
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}
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}
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bool MayThrow = false;
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MCSymbol *LastLabel = 0;
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for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
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I != E; ++I) {
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for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
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MI != E; ++MI) {
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if (!MI->isLabel()) {
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MayThrow |= MI->getDesc().isCall();
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continue;
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}
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MCSymbol *BeginLabel = MI->getOperand(0).getMCSymbol();
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if (BeginLabel == LastLabel)
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MayThrow = false;
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RangeMapType::iterator L = PadMap.find(BeginLabel);
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if (L == PadMap.end())
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continue;
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PadRange P = L->second;
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const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
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assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
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"Inconsistent landing pad map!");
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// If some instruction between the previous try-range and this one may
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// throw, create a call-site entry with no landing pad for the region
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// between the try-ranges.
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if (MayThrow) {
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CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
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CallSites.push_back(Site);
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}
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LastLabel = LandingPad->EndLabels[P.RangeIndex];
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CallSiteEntry Site = {BeginLabel, LastLabel,
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LandingPad->LandingPadLabel, FirstActions[P.PadIndex]};
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assert(Site.BeginLabel && Site.EndLabel && Site.PadLabel &&
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"Invalid landing pad!");
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// Try to merge with the previous call-site.
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if (CallSites.size()) {
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CallSiteEntry &Prev = CallSites.back();
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if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
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// Extend the range of the previous entry.
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Prev.EndLabel = Site.EndLabel;
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continue;
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}
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}
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// Otherwise, create a new call-site.
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CallSites.push_back(Site);
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}
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}
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// If some instruction between the previous try-range and the end of the
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// function may throw, create a call-site entry with no landing pad for the
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// region following the try-range.
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if (MayThrow) {
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CallSiteEntry Site = {LastLabel, 0, 0, 0};
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CallSites.push_back(Site);
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}
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// Final tallies.
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unsigned SizeSites = CallSites.size() * (sizeof(int32_t) + // Site start.
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sizeof(int32_t) + // Site length.
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sizeof(int32_t)); // Landing pad.
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for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
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SizeSites += MCAsmInfo::getULEB128Size(CallSites[i].Action);
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unsigned SizeTypes = TypeInfos.size() * TD->getPointerSize();
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unsigned TypeOffset = sizeof(int8_t) + // Call site format
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// Call-site table length
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MCAsmInfo::getULEB128Size(SizeSites) +
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SizeSites + SizeActions + SizeTypes;
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unsigned TotalSize = sizeof(int8_t) + // LPStart format
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sizeof(int8_t) + // TType format
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MCAsmInfo::getULEB128Size(TypeOffset) + // TType base offset
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TypeOffset;
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unsigned SizeAlign = (4 - TotalSize) & 3;
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// Begin the exception table.
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FinalSize = RoundUpToAlign(FinalSize, 4);
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for (unsigned i = 0; i != SizeAlign; ++i) {
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++FinalSize;
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}
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unsigned PointerSize = TD->getPointerSize();
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// Emit the header.
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++FinalSize;
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// Asm->EOL("LPStart format (DW_EH_PE_omit)");
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++FinalSize;
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// Asm->EOL("TType format (DW_EH_PE_absptr)");
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++FinalSize;
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// Asm->EOL("TType base offset");
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++FinalSize;
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// Asm->EOL("Call site format (DW_EH_PE_udata4)");
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++FinalSize;
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// Asm->EOL("Call-site table length");
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// Emit the landing pad site information.
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for (unsigned i = 0; i < CallSites.size(); ++i) {
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CallSiteEntry &S = CallSites[i];
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// Asm->EOL("Region start");
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FinalSize += PointerSize;
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//Asm->EOL("Region length");
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FinalSize += PointerSize;
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// Asm->EOL("Landing pad");
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FinalSize += PointerSize;
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FinalSize += MCAsmInfo::getULEB128Size(S.Action);
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// Asm->EOL("Action");
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}
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// Emit the actions.
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for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
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ActionEntry &Action = Actions[I];
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//Asm->EOL("TypeInfo index");
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FinalSize += MCAsmInfo::getSLEB128Size(Action.ValueForTypeID);
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//Asm->EOL("Next action");
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FinalSize += MCAsmInfo::getSLEB128Size(Action.NextAction);
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}
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// Emit the type ids.
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for (unsigned M = TypeInfos.size(); M; --M) {
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// Asm->EOL("TypeInfo");
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FinalSize += PointerSize;
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}
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// Emit the filter typeids.
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for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
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unsigned TypeID = FilterIds[j];
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FinalSize += MCAsmInfo::getULEB128Size(TypeID);
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//Asm->EOL("Filter TypeInfo index");
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}
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FinalSize = RoundUpToAlign(FinalSize, 4);
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return FinalSize;
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}
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@ -49,17 +49,6 @@ class JITDwarfEmitter {
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unsigned char* EndFunction,
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unsigned char* ExceptionTable) const;
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unsigned GetExceptionTableSizeInBytes(MachineFunction* MF) const;
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unsigned
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GetFrameMovesSizeInBytes(intptr_t BaseLabelPtr,
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const std::vector<MachineMove> &Moves) const;
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unsigned GetCommonEHFrameSizeInBytes(const Function* Personality) const;
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unsigned GetEHFrameSizeInBytes(const Function* Personality,
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unsigned char* StartFunction) const;
|
||||
|
||||
public:
|
||||
|
||||
JITDwarfEmitter(JIT& jit);
|
||||
@ -71,11 +60,6 @@ public:
|
||||
unsigned char* &EHFramePtr);
|
||||
|
||||
|
||||
unsigned GetDwarfTableSizeInBytes(MachineFunction& F,
|
||||
JITCodeEmitter& JCE,
|
||||
unsigned char* StartFunction,
|
||||
unsigned char* EndFunction);
|
||||
|
||||
void setModuleInfo(MachineModuleInfo* Info) {
|
||||
MMI = Info;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user