static DWARFExpression MakeRegisterBasedLocationExpressionInternal(
llvm::codeview::RegisterId reg, llvm::Optional<int32_t> relative_offset,
lldb::ModuleSP module) {
return MakeLocationExpressionInternal(
module, [&](Stream &stream, RegisterKind ®ister_kind) -> bool {
uint32_t reg_num = GetRegisterNumber(
module->GetArchitecture().GetMachine(), reg, register_kind);
if (reg_num == LLDB_INVALID_REGNUM)
return false;
if (reg_num > 31) {
llvm::dwarf::LocationAtom base = relative_offset
? llvm::dwarf::DW_OP_bregx
: llvm::dwarf::DW_OP_regx;
stream.PutHex8(base);
stream.PutULEB128(reg_num);
} else {
llvm::dwarf::LocationAtom base = relative_offset
? llvm::dwarf::DW_OP_breg0
: llvm::dwarf::DW_OP_reg0;
stream.PutHex8(base + reg_num);
}
if (relative_offset)
stream.PutSLEB128(*relative_offset);
return true;
});
}
static DWARFExpression MakeLocationExpressionInternal(lldb::ModuleSP module,
StreamWriter &&writer) {
const ArchSpec &architecture = module->GetArchitecture();
ByteOrder byte_order = architecture.GetByteOrder();
uint32_t address_size = architecture.GetAddressByteSize();
uint32_t byte_size = architecture.GetDataByteSize();
if (byte_order == eByteOrderInvalid || address_size == 0)
return DWARFExpression(nullptr);
RegisterKind register_kind = eRegisterKindDWARF;
StreamBuffer<32> stream(Stream::eBinary, address_size, byte_order);
if (!writer(stream, register_kind))
return DWARFExpression(nullptr);
DataBufferSP buffer =
std::make_shared<DataBufferHeap>(stream.GetData(), stream.GetSize());
DataExtractor extractor(buffer, byte_order, address_size, byte_size);
DWARFExpression result(module, extractor, nullptr, 0, buffer->GetByteSize());
result.SetRegisterKind(register_kind);
return result;
}