Example #1
0
/// EmitDbgValue - Generate machine instruction for a dbg_value node.
///
MachineInstr *
InstrEmitter::EmitDbgValue(SDDbgValue *SD,
                           DenseMap<SDValue, unsigned> &VRBaseMap) {
  uint64_t Offset = SD->getOffset();
  MDNode* MDPtr = SD->getMDPtr();
  DebugLoc DL = SD->getDebugLoc();

  if (SD->getKind() == SDDbgValue::FRAMEIX) {
    // Stack address; this needs to be lowered in target-dependent fashion.
    // EmitTargetCodeForFrameDebugValue is responsible for allocation.
    return BuildMI(*MF, DL, TII->get(TargetOpcode::DBG_VALUE))
        .addFrameIndex(SD->getFrameIx()).addImm(Offset).addMetadata(MDPtr);
  }
  // Otherwise, we're going to create an instruction here.
  const MCInstrDesc &II = TII->get(TargetOpcode::DBG_VALUE);
  MachineInstrBuilder MIB = BuildMI(*MF, DL, II);
  if (SD->getKind() == SDDbgValue::SDNODE) {
    SDNode *Node = SD->getSDNode();
    SDValue Op = SDValue(Node, SD->getResNo());
    // It's possible we replaced this SDNode with other(s) and therefore
    // didn't generate code for it.  It's better to catch these cases where
    // they happen and transfer the debug info, but trying to guarantee that
    // in all cases would be very fragile; this is a safeguard for any
    // that were missed.
    DenseMap<SDValue, unsigned>::iterator I = VRBaseMap.find(Op);
    if (I==VRBaseMap.end())
      MIB.addReg(0U);       // undef
    else
      AddOperand(MIB, Op, (*MIB).getNumOperands(), &II, VRBaseMap,
                 /*IsDebug=*/true, /*IsClone=*/false, /*IsCloned=*/false);
  } else if (SD->getKind() == SDDbgValue::CONST) {
    const Value *V = SD->getConst();
    if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
      if (CI->getBitWidth() > 64)
        MIB.addCImm(CI);
      else
        MIB.addImm(CI->getSExtValue());
    } else if (const ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
      MIB.addFPImm(CF);
    } else {
      // Could be an Undef.  In any case insert an Undef so we can see what we
      // dropped.
      MIB.addReg(0U);
    }
  } else {
    // Insert an Undef so we can see what we dropped.
    MIB.addReg(0U);
  }

  if (Offset != 0) // Indirect addressing.
    MIB.addImm(Offset);
  else
    MIB.addReg(0U, RegState::Debug);

  MIB.addMetadata(MDPtr);

  return &*MIB;
}
Example #2
0
/// EmitDbgValue - Generate machine instruction for a dbg_value node.
///
MachineInstr *
InstrEmitter::EmitDbgValue(SDDbgValue *SD,
                           DenseMap<SDValue, unsigned> &VRBaseMap) {
  MDNode *Var = SD->getVariable();
  MDNode *Expr = SD->getExpression();
  DebugLoc DL = SD->getDebugLoc();
  assert(cast<DILocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
         "Expected inlined-at fields to agree");

  if (SD->getKind() == SDDbgValue::FRAMEIX) {
    // Stack address; this needs to be lowered in target-dependent fashion.
    // EmitTargetCodeForFrameDebugValue is responsible for allocation.
    auto FrameMI = BuildMI(*MF, DL, TII->get(TargetOpcode::DBG_VALUE))
                       .addFrameIndex(SD->getFrameIx());
    if (SD->isIndirect())
      // Push [fi + 0] onto the DIExpression stack.
      FrameMI.addImm(0);
    else
      // Push fi onto the DIExpression stack.
      FrameMI.addReg(0);
    return FrameMI.addMetadata(Var).addMetadata(Expr);
  }
  // Otherwise, we're going to create an instruction here.
  const MCInstrDesc &II = TII->get(TargetOpcode::DBG_VALUE);
  MachineInstrBuilder MIB = BuildMI(*MF, DL, II);
  if (SD->getKind() == SDDbgValue::SDNODE) {
    SDNode *Node = SD->getSDNode();
    SDValue Op = SDValue(Node, SD->getResNo());
    // It's possible we replaced this SDNode with other(s) and therefore
    // didn't generate code for it.  It's better to catch these cases where
    // they happen and transfer the debug info, but trying to guarantee that
    // in all cases would be very fragile; this is a safeguard for any
    // that were missed.
    DenseMap<SDValue, unsigned>::iterator I = VRBaseMap.find(Op);
    if (I==VRBaseMap.end())
      MIB.addReg(0U);       // undef
    else
      AddOperand(MIB, Op, (*MIB).getNumOperands(), &II, VRBaseMap,
                 /*IsDebug=*/true, /*IsClone=*/false, /*IsCloned=*/false);
  } else if (SD->getKind() == SDDbgValue::VREG) {
    MIB.addReg(SD->getVReg(), RegState::Debug);
  } else if (SD->getKind() == SDDbgValue::CONST) {
    const Value *V = SD->getConst();
    if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
      if (CI->getBitWidth() > 64)
        MIB.addCImm(CI);
      else
        MIB.addImm(CI->getSExtValue());
    } else if (const ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
      MIB.addFPImm(CF);
    } else {
      // Could be an Undef.  In any case insert an Undef so we can see what we
      // dropped.
      MIB.addReg(0U);
    }
  } else {
    // Insert an Undef so we can see what we dropped.
    MIB.addReg(0U);
  }

  // Indirect addressing is indicated by an Imm as the second parameter.
  if (SD->isIndirect())
    MIB.addImm(0U);
  else
    MIB.addReg(0U, RegState::Debug);

  MIB.addMetadata(Var);
  MIB.addMetadata(Expr);

  return &*MIB;
}