コード例 #1
0
SDValue WebAssemblyTargetLowering::LowerBR_JT(SDValue Op,
                                              SelectionDAG &DAG) const {
  SDLoc DL(Op);
  SDValue Chain = Op.getOperand(0);
  const auto *JT = cast<JumpTableSDNode>(Op.getOperand(1));
  SDValue Index = Op.getOperand(2);
  assert(JT->getTargetFlags() == 0 && "WebAssembly doesn't set target flags");

  SmallVector<SDValue, 8> Ops;
  Ops.push_back(Chain);
  Ops.push_back(Index);

  MachineJumpTableInfo *MJTI = DAG.getMachineFunction().getJumpTableInfo();
  const auto &MBBs = MJTI->getJumpTables()[JT->getIndex()].MBBs;

  // TODO: For now, we just pick something arbitrary for a default case for now.
  // We really want to sniff out the guard and put in the real default case (and
  // delete the guard).
  Ops.push_back(DAG.getBasicBlock(MBBs[0]));

  // Add an operand for each case.
  for (auto MBB : MBBs)
    Ops.push_back(DAG.getBasicBlock(MBB));

  return DAG.getNode(WebAssemblyISD::SWITCH, DL, MVT::Other, Ops);
}
コード例 #2
0
ファイル: JITEmitter.cpp プロジェクト: JehandadKhan/roccc-2.0
void JITEmitter::startFunction(MachineFunction &F) {
  uintptr_t ActualSize = 0;
  if (MemMgr->NeedsExactSize()) {
    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.
    ActualSize = RoundUpToAlign(ActualSize, 16);
    
    // Add the alignment of the constant pool
    ActualSize = RoundUpToAlign(ActualSize, 
                                1 << MCP->getConstantPoolAlignment());

    // Add the constant pool size
    ActualSize += GetConstantPoolSizeInBytes(MCP);

    // Add the aligment of the jump table info
    ActualSize = RoundUpToAlign(ActualSize, MJTI->getAlignment());

    // Add the jump table size
    ActualSize += GetJumpTableSizeInBytes(MJTI);
    
    // Add the alignment for the function
    ActualSize = RoundUpToAlign(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;
  
  // Ensure the constant pool/jump table info is at least 4-byte aligned.
  emitAlignment(16);

  emitConstantPool(F.getConstantPool());
  initJumpTableInfo(F.getJumpTableInfo());

  // About to start emitting the machine code for the function.
  emitAlignment(std::max(F.getFunction()->getAlignment(), 8U));
  TheJIT->updateGlobalMapping(F.getFunction(), CurBufferPtr);

  MBBLocations.clear();
}
コード例 #3
0
ファイル: MIRPrinter.cpp プロジェクト: jamboree/llvm
void MIRPrinter::convert(ModuleSlotTracker &MST,
                         yaml::MachineJumpTable &YamlJTI,
                         const MachineJumpTableInfo &JTI) {
  YamlJTI.Kind = JTI.getEntryKind();
  unsigned ID = 0;
  for (const auto &Table : JTI.getJumpTables()) {
    std::string Str;
    yaml::MachineJumpTable::Entry Entry;
    Entry.ID = ID++;
    for (const auto *MBB : Table.MBBs) {
      raw_string_ostream StrOS(Str);
      StrOS << printMBBReference(*MBB);
      Entry.Blocks.push_back(StrOS.str());
      Str.clear();
    }
    YamlJTI.Entries.push_back(Entry);
  }
}
コード例 #4
0
ファイル: MIRParser.cpp プロジェクト: hoangt/NyuziToolchain
bool MIRParserImpl::initializeJumpTableInfo(
    MachineFunction &MF, const yaml::MachineJumpTable &YamlJTI,
    PerFunctionMIParsingState &PFS) {
  MachineJumpTableInfo *JTI = MF.getOrCreateJumpTableInfo(YamlJTI.Kind);
  SMDiagnostic Error;
  for (const auto &Entry : YamlJTI.Entries) {
    std::vector<MachineBasicBlock *> Blocks;
    for (const auto &MBBSource : Entry.Blocks) {
      MachineBasicBlock *MBB = nullptr;
      if (parseMBBReference(MBB, MBBSource.Value, MF, PFS))
        return true;
      Blocks.push_back(MBB);
    }
    unsigned Index = JTI->createJumpTableIndex(Blocks);
    // TODO: Report an error when the same jump table slot ID is redefined.
    PFS.JumpTableSlots.insert(std::make_pair(Entry.ID, Index));
  }
  return false;
}
コード例 #5
0
ファイル: MIRParser.cpp プロジェクト: EdHurtig/llvm
bool MIRParserImpl::initializeJumpTableInfo(PerFunctionMIParsingState &PFS,
    const yaml::MachineJumpTable &YamlJTI) {
  MachineJumpTableInfo *JTI = PFS.MF.getOrCreateJumpTableInfo(YamlJTI.Kind);
  for (const auto &Entry : YamlJTI.Entries) {
    std::vector<MachineBasicBlock *> Blocks;
    for (const auto &MBBSource : Entry.Blocks) {
      MachineBasicBlock *MBB = nullptr;
      if (parseMBBReference(PFS, MBB, MBBSource.Value))
        return true;
      Blocks.push_back(MBB);
    }
    unsigned Index = JTI->createJumpTableIndex(Blocks);
    if (!PFS.JumpTableSlots.insert(std::make_pair(Entry.ID.Value, Index))
             .second)
      return error(Entry.ID.SourceRange.Start,
                   Twine("redefinition of jump table entry '%jump-table.") +
                       Twine(Entry.ID.Value) + "'");
  }
  return false;
}