mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
Enable jitting with a known memory size.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49924 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
37bcda3de9
commit
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@ -26,8 +26,9 @@ namespace llvm {
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class JITMemoryManager {
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protected:
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bool HasGOT;
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bool SizeRequired;
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public:
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JITMemoryManager() : HasGOT(false) {}
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JITMemoryManager() : HasGOT(false), SizeRequired(false) {}
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virtual ~JITMemoryManager();
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/// CreateDefaultMemManager - This is used to create the default
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@ -53,6 +54,12 @@ public:
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/// return a pointer to its base.
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virtual unsigned char *getGOTBase() const = 0;
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/// RequireSize - If the memory manager requires to know the size of the
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/// objects to be emitted
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bool RequiresSize() const {
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return SizeRequired;
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}
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//===--------------------------------------------------------------------===//
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// Main Allocation Functions
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//===--------------------------------------------------------------------===//
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@ -634,3 +634,472 @@ unsigned char* JITDwarfEmitter::EmitEHFrame(const Function* Personality,
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return StartEHPtr;
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}
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unsigned JITDwarfEmitter::GetDwarfTableSize(MachineFunction& F,
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MachineCodeEmitter& mce,
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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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needsIndirectEncoding = TM.getTargetAsmInfo()->getNeedsIndirectEncoding();
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stackGrowthDirection = TM.getFrameInfo()->getStackGrowthDirection();
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RI = TM.getRegisterInfo();
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MCE = &mce;
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unsigned FinalSize = 0;
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FinalSize += GetExceptionTableSize(&F);
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const std::vector<Function *> Personalities = MMI->getPersonalities();
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FinalSize += GetCommonEHFrameSize(Personalities[MMI->getPersonalityIndex()]);
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FinalSize += GetEHFrameSize(Personalities[MMI->getPersonalityIndex()], StartFunction);
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return FinalSize;
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}
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/// AddAlignment - Add the specified alignment.
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static void AddAlignment(unsigned& FinalSize, unsigned Alignment) {
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if (Alignment == 0) Alignment = 1;
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FinalSize = (FinalSize + Alignment - 1) & ~(Alignment - 1);
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}
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/// SizeULEB128Bytes - Gives the size of the ULEB128.
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static unsigned SizeULEB128Bytes(unsigned Value) {
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unsigned FinalSize = 0;
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do {
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Value >>= 7;
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++FinalSize;
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} while (Value);
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return FinalSize;
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}
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/// SizeSLEB128Bytes - Gives the size of the SLEB128.
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static unsigned SizeSLEB128Bytes(int Value) {
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int Sign = Value >> (8 * sizeof(Value) - 1);
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bool IsMore;
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unsigned FinalSize = 0;
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do {
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unsigned char Byte = Value & 0x7f;
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Value >>= 7;
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IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
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++FinalSize;
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} while (IsMore);
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return FinalSize;
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}
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/// SizeString - Gives the size of the string.
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static unsigned SizeString(const std::string &String) {
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return String.size() + 1;
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}
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unsigned JITDwarfEmitter::GetEHFrameSize(const Function* Personality,
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unsigned char* StartFunction) {
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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 (MMI->getPersonalityIndex()) {
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FinalSize += SizeULEB128Bytes(4);
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FinalSize += PointerSize;
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} else {
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FinalSize += SizeULEB128Bytes(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 += GetFrameMovesSize((intptr_t)StartFunction, MMI->getFrameMoves());
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AddAlignment(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::GetCommonEHFrameSize(const Function* Personality) {
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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 += SizeString(Personality ? "zPLR" : "zR");
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FinalSize += SizeULEB128Bytes(1);
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FinalSize += SizeSLEB128Bytes(stackGrowth);
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FinalSize += 1;
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if (Personality) {
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FinalSize += SizeULEB128Bytes(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 += SizeULEB128Bytes(dwarf::DW_EH_PE_pcrel);
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FinalSize += SizeULEB128Bytes(dwarf::DW_EH_PE_pcrel);
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} else {
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FinalSize += SizeULEB128Bytes(1);
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FinalSize += SizeULEB128Bytes(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 += GetFrameMovesSize(0, Moves);
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AddAlignment(FinalSize, 4);
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return FinalSize;
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}
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unsigned
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JITDwarfEmitter::GetFrameMovesSize(intptr_t BaseLabelPtr,
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const std::vector<MachineMove> &Moves) {
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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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unsigned LabelID = Move.getLabelID();
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if (LabelID) {
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LabelID = MMI->MappedLabel(LabelID);
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// Throw out move if the label is invalid.
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if (!LabelID) continue;
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}
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intptr_t LabelPtr = 0;
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if (LabelID) LabelPtr = MCE->getLabelAddress(LabelID);
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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 && LabelID && (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.isRegister() && Dst.getRegister() == MachineLocation::VirtualFP) {
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if (!Src.isRegister()) {
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if (Src.getRegister() == MachineLocation::VirtualFP) {
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++FinalSize;
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} else {
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++FinalSize;
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FinalSize +=
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SizeULEB128Bytes(RI->getDwarfRegNum(Src.getRegister(), true));
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}
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int Offset = -Src.getOffset();
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FinalSize += SizeULEB128Bytes(Offset);
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} else {
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assert(0 && "Machine move no supported yet.");
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}
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} else if (Src.isRegister() &&
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Src.getRegister() == MachineLocation::VirtualFP) {
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if (Dst.isRegister()) {
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++FinalSize;
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FinalSize +=
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SizeULEB128Bytes(RI->getDwarfRegNum(Dst.getRegister(), true));
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} else {
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assert(0 && "Machine move no supported yet.");
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}
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} else {
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unsigned Reg = RI->getDwarfRegNum(Src.getRegister(), 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 += SizeULEB128Bytes(Reg);
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FinalSize += SizeSLEB128Bytes(Offset);
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} else if (Reg < 64) {
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++FinalSize;
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FinalSize += SizeULEB128Bytes(Offset);
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} else {
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++FinalSize;
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FinalSize += SizeULEB128Bytes(Reg);
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FinalSize += SizeULEB128Bytes(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 JITDwarfEmitter::GetExceptionTableSize(MachineFunction* MF) {
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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();
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const std::vector<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 -= AsmPrinter::SizeULEB128(*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 = AsmPrinter::SizeSLEB128(PrevAction->NextAction) +
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AsmPrinter::SizeSLEB128(PrevAction->ValueForTypeID);
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for (unsigned j = NumShared; j != SizePrevIds; ++j) {
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SizeAction -= AsmPrinter::SizeSLEB128(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 = AsmPrinter::SizeSLEB128(ValueForTypeID);
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int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
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SizeAction = SizeTypeID + AsmPrinter::SizeSLEB128(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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unsigned 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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unsigned 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->getOpcode() != TargetInstrInfo::LABEL) {
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MayThrow |= MI->getDesc().isCall();
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continue;
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}
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unsigned BeginLabel = MI->getOperand(0).getImm();
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assert(BeginLabel && "Invalid label!");
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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[CallSites.size()-1];
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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 += AsmPrinter::SizeULEB128(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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AsmPrinter::SizeULEB128(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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AsmPrinter::SizeULEB128(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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AddAlignment(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 += SizeULEB128Bytes(S.Action);
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// Asm->EOL("Action");
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}
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||||
|
||||
// Emit the actions.
|
||||
for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
|
||||
ActionEntry &Action = Actions[I];
|
||||
|
||||
//Asm->EOL("TypeInfo index");
|
||||
FinalSize += SizeSLEB128Bytes(Action.ValueForTypeID);
|
||||
//Asm->EOL("Next action");
|
||||
FinalSize += SizeSLEB128Bytes(Action.NextAction);
|
||||
}
|
||||
|
||||
// Emit the type ids.
|
||||
for (unsigned M = TypeInfos.size(); M; --M) {
|
||||
// Asm->EOL("TypeInfo");
|
||||
FinalSize += PointerSize;
|
||||
}
|
||||
|
||||
// Emit the filter typeids.
|
||||
for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
|
||||
unsigned TypeID = FilterIds[j];
|
||||
FinalSize += SizeULEB128Bytes(TypeID);
|
||||
//Asm->EOL("Filter TypeInfo index");
|
||||
}
|
||||
|
||||
AddAlignment(FinalSize, 4);
|
||||
|
||||
return FinalSize;
|
||||
}
|
||||
|
@ -35,9 +35,6 @@ class JITDwarfEmitter {
|
||||
bool needsIndirectEncoding;
|
||||
bool stackGrowthDirection;
|
||||
|
||||
public:
|
||||
JITDwarfEmitter(JIT& jit);
|
||||
|
||||
unsigned char* EmitExceptionTable(MachineFunction* MF,
|
||||
unsigned char* StartFunction,
|
||||
unsigned char* EndFunction);
|
||||
@ -53,17 +50,37 @@ public:
|
||||
unsigned char* EndFunction,
|
||||
unsigned char* ExceptionTable);
|
||||
|
||||
unsigned GetExceptionTableSize(MachineFunction* MF);
|
||||
|
||||
unsigned GetFrameMovesSize(intptr_t BaseLabelPtr,
|
||||
const std::vector<MachineMove> &Moves);
|
||||
|
||||
unsigned GetCommonEHFrameSize(const Function* Personality);
|
||||
|
||||
unsigned GetEHFrameSize(const Function* Personality,
|
||||
unsigned char* StartFunction);
|
||||
|
||||
public:
|
||||
|
||||
JITDwarfEmitter(JIT& jit);
|
||||
|
||||
unsigned char* EmitDwarfTable(MachineFunction& F,
|
||||
MachineCodeEmitter& MCE,
|
||||
unsigned char* StartFunction,
|
||||
unsigned char* EndFunction);
|
||||
|
||||
|
||||
unsigned GetDwarfTableSize(MachineFunction& F,
|
||||
MachineCodeEmitter& MCE,
|
||||
unsigned char* StartFunction,
|
||||
unsigned char* EndFunction);
|
||||
|
||||
void setModuleInfo(MachineModuleInfo* Info) {
|
||||
MMI = Info;
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
} // end namespace llvm
|
||||
|
||||
#endif // LLVM_EXECUTION_ENGINE_JIT_DWARFEMITTER_H
|
||||
|
@ -32,6 +32,7 @@
|
||||
#include "llvm/Support/Debug.h"
|
||||
#include "llvm/Support/MutexGuard.h"
|
||||
#include "llvm/System/Disassembler.h"
|
||||
#include "llvm/Target/TargetInstrInfo.h"
|
||||
#include "llvm/ADT/Statistic.h"
|
||||
#include <algorithm>
|
||||
using namespace llvm;
|
||||
@ -597,9 +598,65 @@ void *JITEmitter::getPointerToGVLazyPtr(GlobalValue *V, void *Reference,
|
||||
return Resolver.getGlobalValueLazyPtr(V, GVAddress);
|
||||
}
|
||||
|
||||
static unsigned GetConstantPoolSizeInBytes(MachineConstantPool *MCP) {
|
||||
const std::vector<MachineConstantPoolEntry> &Constants = MCP->getConstants();
|
||||
if (Constants.empty()) return 0;
|
||||
|
||||
MachineConstantPoolEntry CPE = Constants.back();
|
||||
unsigned Size = CPE.Offset;
|
||||
const Type *Ty = CPE.isMachineConstantPoolEntry()
|
||||
? CPE.Val.MachineCPVal->getType() : CPE.Val.ConstVal->getType();
|
||||
Size += TheJIT->getTargetData()->getABITypeSize(Ty);
|
||||
return Size;
|
||||
}
|
||||
|
||||
static unsigned GetJumpTableSizeInBytes(MachineJumpTableInfo *MJTI) {
|
||||
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
|
||||
if (JT.empty()) return 0;
|
||||
|
||||
unsigned NumEntries = 0;
|
||||
for (unsigned i = 0, e = JT.size(); i != e; ++i)
|
||||
NumEntries += JT[i].MBBs.size();
|
||||
|
||||
unsigned EntrySize = MJTI->getEntrySize();
|
||||
|
||||
return NumEntries * EntrySize;
|
||||
}
|
||||
|
||||
static void AddAlignment(uintptr_t& Size, unsigned Alignment) {
|
||||
if (Alignment == 0) Alignment = 1;
|
||||
Size = (Size + Alignment - 1) & (Alignment - 1);
|
||||
}
|
||||
|
||||
void JITEmitter::startFunction(MachineFunction &F) {
|
||||
uintptr_t ActualSize;
|
||||
uintptr_t ActualSize = 0;
|
||||
if (MemMgr->RequiresSize()) {
|
||||
const TargetInstrInfo* TII = F.getTarget().getInstrInfo();
|
||||
MachineJumpTableInfo *MJTI = F.getJumpTableInfo();
|
||||
MachineConstantPool *MCP = F.getConstantPool();
|
||||
|
||||
// Ensure the constant pool/jump table info is at least 4-byte aligned.
|
||||
AddAlignment(ActualSize, 16);
|
||||
|
||||
// Add the alignment of the constant pool
|
||||
AddAlignment(ActualSize, 1 << MCP->getConstantPoolAlignment());
|
||||
|
||||
// Add the constant pool size
|
||||
ActualSize += GetConstantPoolSizeInBytes(MCP);
|
||||
|
||||
// Add the aligment of the jump table info
|
||||
AddAlignment(ActualSize, MJTI->getAlignment());
|
||||
|
||||
// Add the jump table size
|
||||
ActualSize += GetJumpTableSizeInBytes(MJTI);
|
||||
|
||||
// Add the alignment for the function
|
||||
AddAlignment(ActualSize, std::max(F.getFunction()->getAlignment(), 8U));
|
||||
|
||||
// Add the function size
|
||||
ActualSize += TII->GetFunctionSizeInBytes(F);
|
||||
}
|
||||
|
||||
BufferBegin = CurBufferPtr = MemMgr->startFunctionBody(F.getFunction(),
|
||||
ActualSize);
|
||||
BufferEnd = BufferBegin+ActualSize;
|
||||
@ -714,10 +771,14 @@ bool JITEmitter::finishFunction(MachineFunction &F) {
|
||||
<< sys::disassembleBuffer(FnStart, FnEnd-FnStart, (uintptr_t)FnStart);
|
||||
#endif
|
||||
if (ExceptionHandling) {
|
||||
uintptr_t ActualSize;
|
||||
uintptr_t ActualSize = 0;
|
||||
SavedBufferBegin = BufferBegin;
|
||||
SavedBufferEnd = BufferEnd;
|
||||
SavedCurBufferPtr = CurBufferPtr;
|
||||
|
||||
if (MemMgr->RequiresSize()) {
|
||||
ActualSize = DE->GetDwarfTableSize(F, *this, FnStart, FnEnd);
|
||||
}
|
||||
|
||||
BufferBegin = CurBufferPtr = MemMgr->startExceptionTable(F.getFunction(),
|
||||
ActualSize);
|
||||
|
Loading…
Reference in New Issue
Block a user