TargetLocation GetLocation(StackFrame frame, TargetMemoryAccess memory,
byte[] data)
{
TargetBinaryReader locreader = new TargetBinaryReader (
data, comp_unit.DwarfReader.TargetMemoryInfo);
byte opcode = locreader.ReadByte ();
bool is_regoffset;
int reg, off;
if ((opcode >= 0x50) && (opcode <= 0x6f)) { // DW_OP_reg
reg = opcode - 0x50 + 3;
off = 0;
is_regoffset = false;
} else if ((opcode >= 0x70) && (opcode <= 0x8f)) { // DW_OP_breg
reg = opcode - 0x70 + 3;
off = locreader.ReadSLeb128 ();
is_regoffset = true;
} else if (opcode == 0x90) { // DW_OP_regx
reg = locreader.ReadLeb128 () + 3;
off = 0;
is_regoffset = false;
} else if (opcode == 0x91) { // DW_OP_fbreg
off = locreader.ReadSLeb128 ();
if (frame_base != null) {
TargetLocation rloc = new RelativeTargetLocation (
frame_base.GetLocation (frame, memory), off);
if (is_byref)
return new DereferencedTargetLocation (rloc);
else
return rloc;
} else {
is_regoffset = true;
reg = 2;
}
} else if (opcode == 0x92) { // DW_OP_bregx
reg = locreader.ReadLeb128 () + 3;
off = locreader.ReadSLeb128 ();
is_regoffset = true;
} else if (opcode == 0x03) { // DW_OP_addr
TargetAddress addr = new TargetAddress (
memory.AddressDomain, locreader.ReadAddress ());
TargetLocation aloc = new AbsoluteTargetLocation (addr);
if (is_byref)
return new DereferencedTargetLocation (aloc);
else
return aloc;
} else {
Console.WriteLine ("UNKNOWN OPCODE: {0:x}", opcode);
return null;
}
reg = comp_unit.DwarfReader.bfd.Architecture.DwarfFrameRegisterMap [reg];
MonoVariableLocation loc = MonoVariableLocation.Create (
memory, is_regoffset, frame.Registers [reg],
off, is_byref);
if (!locreader.IsEof) {
Console.WriteLine ("LOCREADER NOT AT EOF!");
return null;
}
return loc;
}
public TargetLocation GetLocation(TargetLocation location)
{
if (location_block == null)
throw new NotImplementedException ();
TargetBinaryReader locreader = new TargetBinaryReader (
location_block, comp_unit.DwarfReader.TargetMemoryInfo);
byte opcode = locreader.ReadByte ();
if (opcode == 0x23) // DW_OP_plus_uconst
location = new RelativeTargetLocation (location, locreader.ReadLeb128 ());
else {
Console.WriteLine ("UNKNOWN OPCODE: {0:x}", opcode);
return null;
}
if (!locreader.IsEof) {
Console.WriteLine ("LOCREADER NOT AT EOF!");
return null;
}
return location;
}
