return true;
}
-void DwarfExpression::AddMachineRegPiece(unsigned MachineReg,
+bool DwarfExpression::AddMachineRegPiece(unsigned MachineReg,
unsigned PieceSizeInBits,
unsigned PieceOffsetInBits) {
const TargetRegisterInfo *TRI = getTRI();
AddReg(Reg);
if (PieceSizeInBits)
AddOpPiece(PieceSizeInBits, PieceOffsetInBits);
- return;
+ return true;
}
// Walk up the super-register chain until we find a valid number.
AddShr(RegOffset);
AddOpPiece(Size, PieceOffsetInBits);
}
- return;
+ return true;
}
}
}
}
- if (CurPos == PieceOffsetInBits)
- // FIXME: We have no reasonable way of handling errors in here.
- EmitOp(dwarf::DW_OP_nop, "nop (could not find a dwarf register number)");
+ return CurPos > PieceOffsetInBits;
}
void DwarfExpression::AddSignedConstant(int Value) {
return OffsetInBits;
}
-void DwarfExpression::AddMachineRegExpression(DIExpression Expr,
+bool DwarfExpression::AddMachineRegExpression(DIExpression Expr,
unsigned MachineReg,
unsigned PieceOffsetInBits) {
unsigned N = Expr.getNumElements();
unsigned I = 0;
+ bool ValidReg = false;
// Pattern-match combinations for which more efficient representations exist
// first.
if (N >= 3 && Expr.getElement(0) == dwarf::DW_OP_piece) {
unsigned SizeOfByte = 8;
unsigned OffsetInBits = Expr.getElement(1) * SizeOfByte;
unsigned SizeInBits = Expr.getElement(2) * SizeOfByte;
- AddMachineRegPiece(MachineReg, SizeInBits,
- getOffsetOrZero(OffsetInBits, PieceOffsetInBits));
+ ValidReg =
+ AddMachineRegPiece(MachineReg, SizeInBits,
+ getOffsetOrZero(OffsetInBits, PieceOffsetInBits));
I = 3;
} else if (N >= 3 && Expr.getElement(0) == dwarf::DW_OP_plus &&
Expr.getElement(2) == dwarf::DW_OP_deref) {
// [DW_OP_reg,Offset,DW_OP_plus,DW_OP_deref] --> [DW_OP_breg,Offset].
unsigned Offset = Expr.getElement(1);
- AddMachineRegIndirect(MachineReg, Offset);
+ ValidReg = AddMachineRegIndirect(MachineReg, Offset);
I = 3;
} else if (N >= 1 && Expr.getElement(0) == dwarf::DW_OP_deref) {
// [DW_OP_reg,DW_OP_deref] --> [DW_OP_breg].
- AddMachineRegIndirect(MachineReg);
+ ValidReg = AddMachineRegIndirect(MachineReg);
I = 1;
} else
- AddMachineRegPiece(MachineReg);
+ ValidReg = AddMachineRegPiece(MachineReg);
+
+ if (!ValidReg)
+ return false;
// Emit remaining elements of the expression.
AddExpression(Expr, I);
+ return true;
}
void DwarfExpression::AddExpression(DIExpression Expr, unsigned I,
void AddShr(unsigned ShiftBy);
/// Emit an indirect dwarf register operation for the given machine register.
- /// Returns false if no DWARF register exists for MachineReg.
+ /// \return false if no DWARF register exists for MachineReg.
bool AddMachineRegIndirect(unsigned MachineReg, int Offset = 0);
/// \brief Emit a partial DWARF register operation.
/// function will attempt to emit a DWARF register by emitting a
/// piece of a super-register or by piecing together multiple
/// subregisters that alias the register.
- void AddMachineRegPiece(unsigned MachineReg, unsigned PieceSizeInBits = 0,
+ ///
+ /// \return false if no DWARF register exists for MachineReg.
+ bool AddMachineRegPiece(unsigned MachineReg, unsigned PieceSizeInBits = 0,
unsigned PieceOffsetInBits = 0);
/// Emit a signed constant.
/// Emit an entire DIExpression on top of a machine register location.
/// \param PieceOffsetInBits If this is one piece out of a fragmented
/// location, this is the offset of the piece inside the entire variable.
- void AddMachineRegExpression(DIExpression Expr, unsigned MachineReg,
+ /// \return false if no DWARF register exists for MachineReg.
+ bool AddMachineRegExpression(DIExpression Expr, unsigned MachineReg,
unsigned PieceOffsetInBits = 0);
/// Emit a the operations in a DIExpression, starting from element I.
/// \param PieceOffsetInBits If this is one piece out of a fragmented