C++ UnwindPlan::SetPlanValidAddressRange方法代码示例

bool
CompactUnwindInfo::GetUnwindPlan (Target &target, Address addr, UnwindPlan& unwind_plan)
{
    if (!IsValid (target.GetProcessSP()))
    {
        return false;
    }
    FunctionInfo function_info;
    if (GetCompactUnwindInfoForFunction (target, addr, function_info))
    {
        // shortcut return for functions that have no compact unwind
        if (function_info.encoding == 0)
            return false;

        ArchSpec arch;
        if (m_objfile.GetArchitecture (arch))
        {

            Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND));
            if (log && log->GetVerbose())
            {
                StreamString strm;
                addr.Dump (&strm, NULL, Address::DumpStyle::DumpStyleResolvedDescriptionNoFunctionArguments, Address::DumpStyle::DumpStyleFileAddress, arch.GetAddressByteSize()); 
                log->Printf ("Got compact unwind encoding 0x%x for function %s", function_info.encoding, strm.GetData());
            }

            if (function_info.valid_range_offset_start != 0 && function_info.valid_range_offset_end != 0)
            {
                SectionList *sl = m_objfile.GetSectionList ();
                if (sl)
                {
                    addr_t func_range_start_file_addr = 
                              function_info.valid_range_offset_start + m_objfile.GetHeaderAddress().GetFileAddress();
                    AddressRange func_range (func_range_start_file_addr,
                                      function_info.valid_range_offset_end - function_info.valid_range_offset_start,
                                      sl);
                    unwind_plan.SetPlanValidAddressRange (func_range);
                }
            }

            if (arch.GetTriple().getArch() == llvm::Triple::x86_64)
            {
                return CreateUnwindPlan_x86_64 (target, function_info, unwind_plan, addr);
            }
            if (arch.GetTriple().getArch() == llvm::Triple::x86)
            {
                return CreateUnwindPlan_i386 (target, function_info, unwind_plan, addr);
            }
        }
    }
    return false;
}

bool
DWARFCallFrameInfo::FDEToUnwindPlan (dw_offset_t offset, Address startaddr, UnwindPlan& unwind_plan)
{
    dw_offset_t current_entry = offset;

    if (m_section_sp.get() == NULL || m_section_sp->IsEncrypted())
        return false;

    if (m_cfi_data_initialized == false)
        GetCFIData();

    uint32_t length = m_cfi_data.GetU32 (&offset);
    dw_offset_t cie_offset = m_cfi_data.GetU32 (&offset);

    assert (cie_offset != 0 && cie_offset != UINT32_MAX);

    // Translate the CIE_id from the eh_frame format, which
    // is relative to the FDE offset, into a __eh_frame section
    // offset
    if (m_is_eh_frame)
    {
        unwind_plan.SetSourceName ("eh_frame CFI");
        cie_offset = current_entry + 4 - cie_offset;
        unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
    }
    else
    {
        unwind_plan.SetSourceName ("DWARF CFI");
        // In theory the debug_frame info should be valid at all call sites
        // ("asynchronous unwind info" as it is sometimes called) but in practice
        // gcc et al all emit call frame info for the prologue and call sites, but
        // not for the epilogue or all the other locations during the function reliably.
        unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
    }
    unwind_plan.SetSourcedFromCompiler (eLazyBoolYes);

    const CIE *cie = GetCIE (cie_offset);
    assert (cie != NULL);

    const dw_offset_t end_offset = current_entry + length + 4;

    const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
    const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS;
    const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS;
    lldb::addr_t range_base = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding, pc_rel_addr, text_addr, data_addr);
    lldb::addr_t range_len = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding & DW_EH_PE_MASK_ENCODING, pc_rel_addr, text_addr, data_addr);
    AddressRange range (range_base, m_objfile.GetAddressByteSize(), m_objfile.GetSectionList());
    range.SetByteSize (range_len);

    if (cie->augmentation[0] == 'z')
    {
        uint32_t aug_data_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
        offset += aug_data_len;
    }

    uint32_t reg_num = 0;
    int32_t op_offset = 0;
    uint32_t code_align = cie->code_align;
    int32_t data_align = cie->data_align;

    unwind_plan.SetPlanValidAddressRange (range);
    UnwindPlan::Row *cie_initial_row = new UnwindPlan::Row;
    *cie_initial_row = cie->initial_row;
    UnwindPlan::RowSP row(cie_initial_row);

    unwind_plan.SetRegisterKind (m_reg_kind);
    unwind_plan.SetReturnAddressRegister (cie->return_addr_reg_num);

    UnwindPlan::Row::RegisterLocation reg_location;
    while (m_cfi_data.ValidOffset(offset) && offset < end_offset)
    {
        uint8_t inst = m_cfi_data.GetU8(&offset);
        uint8_t primary_opcode  = inst & 0xC0;
        uint8_t extended_opcode = inst & 0x3F;

        if (primary_opcode)
        {
            switch (primary_opcode)
            {
                case DW_CFA_advance_loc :   // (Row Creation Instruction)
                    {   // 0x40 - high 2 bits are 0x1, lower 6 bits are delta
                        // takes a single argument that represents a constant delta. The
                        // required action is to create a new table row with a location
                        // value that is computed by taking the current entry's location
                        // value and adding (delta * code_align). All other
                        // values in the new row are initially identical to the current row.
                        unwind_plan.AppendRow(row);
                        UnwindPlan::Row *newrow = new UnwindPlan::Row;
                        *newrow = *row.get();
                        row.reset (newrow);
                        row->SlideOffset(extended_opcode * code_align);
                    }
                    break;

                case DW_CFA_offset      :
                    {   // 0x80 - high 2 bits are 0x2, lower 6 bits are register
                        // takes two arguments: an unsigned LEB128 constant representing a
                        // factored offset and a register number. The required action is to
                        // change the rule for the register indicated by the register number
                        // to be an offset(N) rule with a value of
//.........这里部分代码省略.........

bool
DWARFCallFrameInfo::FDEToUnwindPlan (dw_offset_t dwarf_offset, Address startaddr, UnwindPlan& unwind_plan)
{
    lldb::offset_t offset = dwarf_offset;
    lldb::offset_t current_entry = offset;

    if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
        return false;

    if (m_cfi_data_initialized == false)
        GetCFIData();

    uint32_t length = m_cfi_data.GetU32 (&offset);
    dw_offset_t cie_offset;
    bool is_64bit = (length == UINT32_MAX);
    if (is_64bit) {
        length = m_cfi_data.GetU64 (&offset);
        cie_offset = m_cfi_data.GetU64 (&offset);
    } else {
        cie_offset = m_cfi_data.GetU32 (&offset);
    }

    assert (cie_offset != 0 && cie_offset != UINT32_MAX);

    // Translate the CIE_id from the eh_frame format, which
    // is relative to the FDE offset, into a __eh_frame section
    // offset
    if (m_is_eh_frame)
    {
        unwind_plan.SetSourceName ("eh_frame CFI");
        cie_offset = current_entry + (is_64bit ? 12 : 4) - cie_offset;
        unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
    }
    else
    {
        unwind_plan.SetSourceName ("DWARF CFI");
        // In theory the debug_frame info should be valid at all call sites
        // ("asynchronous unwind info" as it is sometimes called) but in practice
        // gcc et al all emit call frame info for the prologue and call sites, but
        // not for the epilogue or all the other locations during the function reliably.
        unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
    }
    unwind_plan.SetSourcedFromCompiler (eLazyBoolYes);

    const CIE *cie = GetCIE (cie_offset);
    assert (cie != nullptr);

    const dw_offset_t end_offset = current_entry + length + (is_64bit ? 12 : 4);

    const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
    const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS;
    const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS;
    lldb::addr_t range_base = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding, pc_rel_addr, text_addr, data_addr);
    lldb::addr_t range_len = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding & DW_EH_PE_MASK_ENCODING, pc_rel_addr, text_addr, data_addr);
    AddressRange range (range_base, m_objfile.GetAddressByteSize(), m_objfile.GetSectionList());
    range.SetByteSize (range_len);

    addr_t lsda_data_file_address = LLDB_INVALID_ADDRESS;

    if (cie->augmentation[0] == 'z')
    {
        uint32_t aug_data_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
        if (aug_data_len != 0 && cie->lsda_addr_encoding != DW_EH_PE_omit)
        {
            offset_t saved_offset = offset;
            lsda_data_file_address = m_cfi_data.GetGNUEHPointer(&offset, cie->lsda_addr_encoding, pc_rel_addr, text_addr, data_addr);
            if (offset - saved_offset != aug_data_len)
            {
                // There is more in the augmentation region than we know how to process;
                // don't read anything.
                lsda_data_file_address = LLDB_INVALID_ADDRESS;
            }
            offset = saved_offset;
        }
        offset += aug_data_len;
    }
    Address lsda_data;
    Address personality_function_ptr;

    if (lsda_data_file_address != LLDB_INVALID_ADDRESS && cie->personality_loc != LLDB_INVALID_ADDRESS)
    {
        m_objfile.GetModule()->ResolveFileAddress (lsda_data_file_address, lsda_data);
        m_objfile.GetModule()->ResolveFileAddress (cie->personality_loc, personality_function_ptr);
    }

    if (lsda_data.IsValid() && personality_function_ptr.IsValid())
    {
        unwind_plan.SetLSDAAddress (lsda_data);
        unwind_plan.SetPersonalityFunctionPtr (personality_function_ptr);
    }

    uint32_t code_align = cie->code_align;
    int32_t data_align = cie->data_align;

    unwind_plan.SetPlanValidAddressRange (range);
    UnwindPlan::Row *cie_initial_row = new UnwindPlan::Row;
    *cie_initial_row = cie->initial_row;
    UnwindPlan::RowSP row(cie_initial_row);

    unwind_plan.SetRegisterKind (m_reg_kind);
//.........这里部分代码省略.........