bool
ABISysV_ppc::CreateFunctionEntryUnwindPlan (UnwindPlan &unwind_plan)
{
    unwind_plan.Clear();
    unwind_plan.SetRegisterKind (eRegisterKindDWARF);

    uint32_t lr_reg_num = gcc_dwarf_lr;
    uint32_t sp_reg_num = gcc_dwarf_r1;
    uint32_t pc_reg_num = gcc_dwarf_pc;

    UnwindPlan::RowSP row(new UnwindPlan::Row);

    // Our Call Frame Address is the stack pointer value
    row->GetCFAValue().SetIsRegisterPlusOffset (sp_reg_num, 0);

    // The previous PC is in the LR
    row->SetRegisterLocationToRegister(pc_reg_num, lr_reg_num, true);
    unwind_plan.AppendRow (row);

    // All other registers are the same.

    unwind_plan.SetSourceName ("ppc at-func-entry default");
    unwind_plan.SetSourcedFromCompiler (eLazyBoolNo);

    return true;
}

bool
ABIMacOSX_arm::CreateFunctionEntryUnwindPlan (UnwindPlan &unwind_plan)
{
    uint32_t reg_kind = unwind_plan.GetRegisterKind();
    uint32_t lr_reg_num = LLDB_INVALID_REGNUM;
    uint32_t sp_reg_num = LLDB_INVALID_REGNUM;
    uint32_t pc_reg_num = LLDB_INVALID_REGNUM;
    
    switch (reg_kind)
    {
        case eRegisterKindDWARF:
        case eRegisterKindGCC:
            lr_reg_num = dwarf_lr;
            sp_reg_num = dwarf_sp;
            pc_reg_num = dwarf_pc;
            break;
            
        case eRegisterKindGeneric:
            lr_reg_num = LLDB_REGNUM_GENERIC_RA;
            sp_reg_num = LLDB_REGNUM_GENERIC_SP;
            pc_reg_num = LLDB_REGNUM_GENERIC_PC;
            break;
    }
    
    if (lr_reg_num == LLDB_INVALID_REGNUM ||
        sp_reg_num == LLDB_INVALID_REGNUM ||
        pc_reg_num == LLDB_INVALID_REGNUM)
        return false;

    UnwindPlan::RowSP row(new UnwindPlan::Row);
    
    // Our Call Frame Address is the stack pointer value
    row->SetCFARegister (sp_reg_num);
    
    // The previous PC is in the LR
    row->SetRegisterLocationToRegister(pc_reg_num, lr_reg_num, true);
    unwind_plan.AppendRow (row);
    
    // All other registers are the same.
    
    unwind_plan.SetSourceName ("arm at-func-entry default");
    unwind_plan.SetSourcedFromCompiler (eLazyBoolNo);

    return true;
}

bool
ABISysV_ppc64::CreateDefaultUnwindPlan (UnwindPlan &unwind_plan)
{
    unwind_plan.Clear();
    unwind_plan.SetRegisterKind (eRegisterKindDWARF);

    uint32_t sp_reg_num = dwarf_r1;
    uint32_t pc_reg_num = dwarf_lr;

    UnwindPlan::RowSP row(new UnwindPlan::Row);

    const int32_t ptr_size = 8;
    row->GetCFAValue().SetIsRegisterDereferenced(sp_reg_num);

    row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * 2, true);
    row->SetRegisterLocationToIsCFAPlusOffset(sp_reg_num, 0, true);
    row->SetRegisterLocationToAtCFAPlusOffset(dwarf_cr, ptr_size, true);

    unwind_plan.AppendRow (row);
    unwind_plan.SetSourceName ("ppc64 default unwind plan");
    unwind_plan.SetSourcedFromCompiler (eLazyBoolNo);
    unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
    unwind_plan.SetReturnAddressRegister(dwarf_lr);
    return true;
}

bool
ABISysV_i386::CreateFunctionEntryUnwindPlan (UnwindPlan &unwind_plan)
{
    unwind_plan.Clear();
    unwind_plan.SetRegisterKind (eRegisterKindDWARF);

    uint32_t sp_reg_num = gcc_dwarf_esp;
    uint32_t pc_reg_num = gcc_dwarf_eip;

    UnwindPlan::RowSP row(new UnwindPlan::Row);
    row->GetCFAValue().SetIsRegisterPlusOffset(sp_reg_num, 4);
    row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, -4, false);
    row->SetRegisterLocationToIsCFAPlusOffset(sp_reg_num, 0, true);
    unwind_plan.AppendRow (row);
    unwind_plan.SetSourceName ("i386 at-func-entry default");
    unwind_plan.SetSourcedFromCompiler (eLazyBoolNo);
    return true;
}

bool ABISysV_s390x::CreateFunctionEntryUnwindPlan(UnwindPlan &unwind_plan) {
  unwind_plan.Clear();
  unwind_plan.SetRegisterKind(eRegisterKindDWARF);

  UnwindPlan::RowSP row(new UnwindPlan::Row);

  // Our Call Frame Address is the stack pointer value + 160
  row->GetCFAValue().SetIsRegisterPlusOffset(dwarf_r15_s390x, 160);

  // The previous PC is in r14
  row->SetRegisterLocationToRegister(dwarf_pswa_s390x, dwarf_r14_s390x, true);

  // All other registers are the same.
  unwind_plan.AppendRow(row);
  unwind_plan.SetSourceName("s390x at-func-entry default");
  unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
  return true;
}

bool
ABIMacOSX_arm::CreateDefaultUnwindPlan (UnwindPlan &unwind_plan)
{
    uint32_t fp_reg_num = dwarf_r7; // apple uses r7 for all frames. Normal arm uses r11;
    uint32_t pc_reg_num = dwarf_pc;
    
    UnwindPlan::RowSP row(new UnwindPlan::Row);
    const int32_t ptr_size = 4;
    
    unwind_plan.Clear ();
    unwind_plan.SetRegisterKind (eRegisterKindDWARF);
    row->SetCFARegister (fp_reg_num);
    row->SetCFAOffset (2 * ptr_size);
    row->SetOffset (0);
    
    row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true);
    row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true);
    
    unwind_plan.AppendRow (row);
    unwind_plan.SetSourceName ("arm-apple-ios default unwind plan");
    unwind_plan.SetSourcedFromCompiler (eLazyBoolNo);
    unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);

    return true;
}

bool
ABISysV_arm::CreateDefaultUnwindPlan (UnwindPlan &unwind_plan)
{
    unwind_plan.Clear ();
    unwind_plan.SetRegisterKind (eRegisterKindDWARF);

    //TODO: Handle thumb
    uint32_t fp_reg_num = dwarf_r11;
    uint32_t pc_reg_num = dwarf_pc;
    
    UnwindPlan::RowSP row(new UnwindPlan::Row);
    const int32_t ptr_size = 4;
    
    row->GetCFAValue().SetIsRegisterPlusOffset (fp_reg_num, 2 * ptr_size);
    row->SetOffset (0);
    
    row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true);
    row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true);
    
    unwind_plan.AppendRow (row);
    unwind_plan.SetSourceName ("arm default unwind plan");
    unwind_plan.SetSourcedFromCompiler (eLazyBoolNo);
    unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);

    return true;
}

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
ABINyuzi::CreateDefaultUnwindPlan ( UnwindPlan &unwind_plan )
{
  unwind_plan.Clear();
  unwind_plan.SetRegisterKind(eRegisterKindDWARF);
  unwind_plan.SetReturnAddressRegister(30);
  UnwindPlan::RowSP row(new UnwindPlan::Row);

  row->GetCFAValue().SetIsRegisterPlusOffset(29, 0);

  unwind_plan.AppendRow(row);
  unwind_plan.SetSourceName("nyuzi default unwind plan");
  unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
	unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo);
  return true;
}

bool EmulateInstructionARM64::CreateFunctionEntryUnwind(
    UnwindPlan &unwind_plan) {
  unwind_plan.Clear();
  unwind_plan.SetRegisterKind(eRegisterKindLLDB);

  UnwindPlan::RowSP row(new UnwindPlan::Row);

  // Our previous Call Frame Address is the stack pointer
  row->GetCFAValue().SetIsRegisterPlusOffset(gpr_sp_arm64, 0);

  unwind_plan.AppendRow(row);
  unwind_plan.SetSourceName("EmulateInstructionARM64");
  unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
  unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolYes);
  unwind_plan.SetReturnAddressRegister(gpr_lr_arm64);
  return true;
}

bool
ABISysV_mips::CreateDefaultUnwindPlan (UnwindPlan &unwind_plan)
{
    unwind_plan.Clear();
    unwind_plan.SetRegisterKind (eRegisterKindDWARF);

    UnwindPlan::RowSP row(new UnwindPlan::Row);

    row->GetCFAValue().SetIsRegisterPlusOffset(gcc_dwarf_r29, 0);

    row->SetRegisterLocationToRegister(gcc_dwarf_pc, gcc_dwarf_r31, true);
	
    unwind_plan.AppendRow (row);
    unwind_plan.SetSourceName ("mips default unwind plan");
    unwind_plan.SetSourcedFromCompiler (eLazyBoolNo);
    unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
    return true;
}

// called when we are on the first instruction of a new function for hexagon
// the return address is in RA (R31)
bool ABISysV_hexagon::CreateFunctionEntryUnwindPlan(UnwindPlan &unwind_plan) {
  unwind_plan.Clear();
  unwind_plan.SetRegisterKind(eRegisterKindGeneric);
  unwind_plan.SetReturnAddressRegister(LLDB_REGNUM_GENERIC_RA);

  UnwindPlan::RowSP row(new UnwindPlan::Row);

  // Our Call Frame Address is the stack pointer value
  row->GetCFAValue().SetIsRegisterPlusOffset(LLDB_REGNUM_GENERIC_SP, 4);
  row->SetOffset(0);

  // The previous PC is in the LR
  row->SetRegisterLocationToRegister(LLDB_REGNUM_GENERIC_PC,
                                     LLDB_REGNUM_GENERIC_RA, true);
  unwind_plan.AppendRow(row);

  unwind_plan.SetSourceName("hexagon at-func-entry default");
  unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
  return true;
}

bool
EmulateInstructionMIPS::CreateFunctionEntryUnwind (UnwindPlan &unwind_plan)
{
    unwind_plan.Clear();
    unwind_plan.SetRegisterKind (eRegisterKindDWARF);

    UnwindPlan::RowSP row(new UnwindPlan::Row);
    const bool can_replace = false;

    // Our previous Call Frame Address is the stack pointer
    row->GetCFAValue().SetIsRegisterPlusOffset(gcc_dwarf_sp_mips64, 0);

    // Our previous PC is in the RA
    row->SetRegisterLocationToRegister(gcc_dwarf_pc_mips64, gcc_dwarf_ra_mips64, can_replace);

    unwind_plan.AppendRow (row);

    // All other registers are the same.
    unwind_plan.SetSourceName ("EmulateInstructionMIPS");
    unwind_plan.SetSourcedFromCompiler (eLazyBoolNo);
    unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolYes);

    return true;
}

bool
UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly (AddressRange& range, 
                                                                   Thread& thread, 
                                                                   UnwindPlan& unwind_plan)
{
    if (range.GetByteSize() > 0 && 
        range.GetBaseAddress().IsValid() &&
        m_inst_emulator_ap.get())
    {
     
        // The instruction emulation subclass setup the unwind plan for the
        // first instruction.
        m_inst_emulator_ap->CreateFunctionEntryUnwind (unwind_plan);

        // CreateFunctionEntryUnwind should have created the first row. If it
        // doesn't, then we are done.
        if (unwind_plan.GetRowCount() == 0)
            return false;
        
        ExecutionContext exe_ctx;
        thread.CalculateExecutionContext(exe_ctx);
        const bool prefer_file_cache = true;
        DisassemblerSP disasm_sp (Disassembler::DisassembleRange (m_arch,
                                                                  NULL,
                                                                  NULL,
                                                                  exe_ctx,
                                                                  range,
                                                                  prefer_file_cache));
        
        Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND));

        if (disasm_sp)
        {
            
            m_range_ptr = ⦥
            m_thread_ptr = &thread;
            m_unwind_plan_ptr = &unwind_plan;

            const uint32_t addr_byte_size = m_arch.GetAddressByteSize();
            const bool show_address = true;
            const bool show_bytes = true;
            m_inst_emulator_ap->GetRegisterInfo (unwind_plan.GetRegisterKind(), 
                                                 unwind_plan.GetInitialCFARegister(), 
                                                 m_cfa_reg_info);
            
            m_fp_is_cfa = false;
            m_register_values.clear();
            m_pushed_regs.clear();

            // Initialize the CFA with a known value. In the 32 bit case
            // it will be 0x80000000, and in the 64 bit case 0x8000000000000000.
            // We use the address byte size to be safe for any future address sizes
            m_initial_sp = (1ull << ((addr_byte_size * 8) - 1));
            RegisterValue cfa_reg_value;
            cfa_reg_value.SetUInt (m_initial_sp, m_cfa_reg_info.byte_size);
            SetRegisterValue (m_cfa_reg_info, cfa_reg_value);

            const InstructionList &inst_list = disasm_sp->GetInstructionList ();
            const size_t num_instructions = inst_list.GetSize();

            if (num_instructions > 0)
            {
                Instruction *inst = inst_list.GetInstructionAtIndex (0).get();
                const addr_t base_addr = inst->GetAddress().GetFileAddress();

                // Make a copy of the current instruction Row and save it in m_curr_row
                // so we can add updates as we process the instructions.  
                UnwindPlan::RowSP last_row = unwind_plan.GetLastRow();
                UnwindPlan::Row *newrow = new UnwindPlan::Row;
                if (last_row.get())
                    *newrow = *last_row.get();
                m_curr_row.reset(newrow);

                // Once we've seen the initial prologue instructions complete, save a
                // copy of the CFI at that point into prologue_completed_row for possible
                // use later.
                int instructions_since_last_prologue_insn = 0;     // # of insns since last CFI was update

                bool reinstate_prologue_next_instruction = false;  // Next iteration, re-install the prologue row of CFI

                bool last_instruction_restored_return_addr_reg = false;  // re-install the prologue row of CFI if the next instruction is a branch immediate

                bool return_address_register_has_been_saved = false; // if we've seen the ra register get saved yet

                UnwindPlan::RowSP prologue_completed_row;          // copy of prologue row of CFI

                // cache the pc register number (in whatever register numbering this UnwindPlan uses) for
                // quick reference during instruction parsing.
                uint32_t pc_reg_num = LLDB_INVALID_REGNUM;
                RegisterInfo pc_reg_info;
                if (m_inst_emulator_ap->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, pc_reg_info))
                    pc_reg_num = pc_reg_info.kinds[unwind_plan.GetRegisterKind()];
                else
                    pc_reg_num = LLDB_INVALID_REGNUM;

                // cache the return address register number (in whatever register numbering this UnwindPlan uses) for
                // quick reference during instruction parsing.
                uint32_t ra_reg_num = LLDB_INVALID_REGNUM;
                RegisterInfo ra_reg_info;
                if (m_inst_emulator_ap->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA, ra_reg_info))
//.........这里部分代码省略.........

bool
EmulateInstruction::CreateFunctionEntryUnwind (UnwindPlan &unwind_plan)
{
    unwind_plan.Clear();
    return false;
}

bool
CompactUnwindInfo::CreateUnwindPlan_x86_64 (Target &target, FunctionInfo &function_info, UnwindPlan &unwind_plan, Address pc_or_function_start)
{
    unwind_plan.SetSourceName ("compact unwind info");
    unwind_plan.SetSourcedFromCompiler (eLazyBoolYes);
    unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
    unwind_plan.SetRegisterKind (eRegisterKindEHFrame);

    unwind_plan.SetLSDAAddress (function_info.lsda_address);
    unwind_plan.SetPersonalityFunctionPtr (function_info.personality_ptr_address);

    UnwindPlan::RowSP row (new UnwindPlan::Row);

    const int wordsize = 8;
    int mode = function_info.encoding & UNWIND_X86_64_MODE_MASK;
    switch (mode)
    {
        case UNWIND_X86_64_MODE_RBP_FRAME:
        {
            row->GetCFAValue().SetIsRegisterPlusOffset (
                    translate_to_eh_frame_regnum_x86_64 (UNWIND_X86_64_REG_RBP),
                    2 * wordsize);
            row->SetOffset (0);
            row->SetRegisterLocationToAtCFAPlusOffset (x86_64_eh_regnum::rbp, wordsize * -2, true);
            row->SetRegisterLocationToAtCFAPlusOffset (x86_64_eh_regnum::rip, wordsize * -1, true);
            row->SetRegisterLocationToIsCFAPlusOffset (x86_64_eh_regnum::rsp, 0, true);
            
            uint32_t saved_registers_offset = EXTRACT_BITS (function_info.encoding, UNWIND_X86_64_RBP_FRAME_OFFSET);

            uint32_t saved_registers_locations = EXTRACT_BITS (function_info.encoding, UNWIND_X86_64_RBP_FRAME_REGISTERS);

            saved_registers_offset += 2;

            for (int i = 0; i < 5; i++)
            {
                uint32_t regnum = saved_registers_locations & 0x7;
                switch (regnum)
                {
                    case UNWIND_X86_64_REG_NONE:
                        break;
                    case UNWIND_X86_64_REG_RBX:
                    case UNWIND_X86_64_REG_R12:
                    case UNWIND_X86_64_REG_R13:
                    case UNWIND_X86_64_REG_R14:
                    case UNWIND_X86_64_REG_R15:
                        row->SetRegisterLocationToAtCFAPlusOffset (translate_to_eh_frame_regnum_x86_64 (regnum), wordsize * -saved_registers_offset, true);
                        break;
                }
                saved_registers_offset--;
                saved_registers_locations >>= 3;
            }
            unwind_plan.AppendRow (row);
            return true;
        }
        break;

        case UNWIND_X86_64_MODE_STACK_IND:
        {
            // The clang in Xcode 6 is emitting incorrect compact unwind encodings for this
            // style of unwind.  It was fixed in llvm r217020.  
            // The clang in Xcode 7 has this fixed.
            return false;
        }
        break;

        case UNWIND_X86_64_MODE_STACK_IMMD:
        {
            uint32_t stack_size = EXTRACT_BITS (function_info.encoding, UNWIND_X86_64_FRAMELESS_STACK_SIZE);
            uint32_t register_count = EXTRACT_BITS (function_info.encoding, UNWIND_X86_64_FRAMELESS_STACK_REG_COUNT);
            uint32_t permutation = EXTRACT_BITS (function_info.encoding, UNWIND_X86_64_FRAMELESS_STACK_REG_PERMUTATION);

            if (mode == UNWIND_X86_64_MODE_STACK_IND && function_info.valid_range_offset_start != 0)
            {
                uint32_t stack_adjust = EXTRACT_BITS (function_info.encoding, UNWIND_X86_64_FRAMELESS_STACK_ADJUST);

                // offset into the function instructions; 0 == beginning of first instruction
                uint32_t offset_to_subl_insn = EXTRACT_BITS (function_info.encoding, UNWIND_X86_64_FRAMELESS_STACK_SIZE);

                SectionList *sl = m_objfile.GetSectionList ();
                if (sl)
                {
                    ProcessSP process_sp = target.GetProcessSP();
                    if (process_sp)
                    {
                        Address subl_payload_addr (function_info.valid_range_offset_start, sl);
                        subl_payload_addr.Slide (offset_to_subl_insn);
                        Error error;
                        uint64_t large_stack_size = process_sp->ReadUnsignedIntegerFromMemory (subl_payload_addr.GetLoadAddress (&target),
                                4, 0, error);
                        if (large_stack_size != 0 && error.Success ())
                        {
                            // Got the large stack frame size correctly - use it
                            stack_size = large_stack_size + (stack_adjust * wordsize);
                        }
                        else
                        {
                            return false;
                        }
                    }
                    else
//.........这里部分代码省略.........

bool
UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly (AddressRange& range, 
                                                                   Thread& thread, 
                                                                   UnwindPlan& unwind_plan)
{
    if (range.GetByteSize() > 0 && 
        range.GetBaseAddress().IsValid() &&
        m_inst_emulator_ap.get())
    {
     
        // The the instruction emulation subclass setup the unwind plan for the
        // first instruction.
        m_inst_emulator_ap->CreateFunctionEntryUnwind (unwind_plan);

        // CreateFunctionEntryUnwind should have created the first row. If it
        // doesn't, then we are done.
        if (unwind_plan.GetRowCount() == 0)
            return false;
        
        ExecutionContext exe_ctx;
        thread.CalculateExecutionContext(exe_ctx);
        DisassemblerSP disasm_sp (Disassembler::DisassembleRange (m_arch,
                                                                  NULL,
                                                                  exe_ctx,
                                                                  range));
        
        LogSP log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND));

        if (disasm_sp)
        {
            
            m_range_ptr = ⦥
            m_thread_ptr = &thread;
            m_unwind_plan_ptr = &unwind_plan;

            const uint32_t addr_byte_size = m_arch.GetAddressByteSize();
            const bool show_address = true;
            const bool show_bytes = true;
            const bool raw = false;
            // Initialize the CFA with a known value. In the 32 bit case
            // it will be 0x80000000, and in the 64 bit case 0x8000000000000000.
            // We use the address byte size to be safe for any future addresss sizes
            m_inst_emulator_ap->GetRegisterInfo (unwind_plan.GetRegisterKind(), 
                                                 unwind_plan.GetInitialCFARegister(), 
                                                 m_cfa_reg_info);
            
            m_fp_is_cfa = false;
            m_register_values.clear();
            m_pushed_regs.clear();

            m_initial_sp = (1ull << ((addr_byte_size * 8) - 1));
            RegisterValue cfa_reg_value;
            cfa_reg_value.SetUInt (m_initial_sp, m_cfa_reg_info.byte_size);
            SetRegisterValue (m_cfa_reg_info, cfa_reg_value);
                
            const InstructionList &inst_list = disasm_sp->GetInstructionList ();
            const size_t num_instructions = inst_list.GetSize();
            if (num_instructions > 0)
            {
                Instruction *inst = inst_list.GetInstructionAtIndex (0).get();
                const addr_t base_addr = inst->GetAddress().GetFileAddress();
                // Initialize the current row with the one row that was created
                // from the CreateFunctionEntryUnwind call above...
                m_curr_row = unwind_plan.GetLastRow();

                for (size_t idx=0; idx<num_instructions; ++idx)
                {
                    inst = inst_list.GetInstructionAtIndex (idx).get();
                    if (inst)
                    {

                        if (log && log->GetVerbose ())
                        {
                            StreamString strm;
                            inst->Dump(&strm, inst_list.GetMaxOpcocdeByteSize (), show_address, show_bytes, &exe_ctx, raw);
                            log->PutCString (strm.GetData());
                        }

                        m_inst_emulator_ap->SetInstruction (inst->GetOpcode(), 
                                                            inst->GetAddress(), 
                                                            exe_ctx.GetTargetPtr());

                        m_inst_emulator_ap->EvaluateInstruction (eEmulateInstructionOptionIgnoreConditions);
                        
                        if (unwind_plan.GetLastRow() != m_curr_row)
                        {
                            // Be sure to not edit the offset unless our row has changed
                            // so that the "!=" call above doesn't trigger every time
                            m_curr_row.SetOffset (inst->GetAddress().GetFileAddress() + inst->GetOpcode().GetByteSize() - base_addr);
                            // Append the new row
                            unwind_plan.AppendRow (m_curr_row);
                        }
                    }
                }
            }
        }
        
        if (log && log->GetVerbose ())
        {
            StreamString strm;
//.........这里部分代码省略.........

bool UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly(
    AddressRange &range, uint8_t *opcode_data, size_t opcode_size,
    UnwindPlan &unwind_plan) {
  if (opcode_data == nullptr || opcode_size == 0)
    return false;

  if (range.GetByteSize() > 0 && range.GetBaseAddress().IsValid() &&
      m_inst_emulator_ap.get()) {

    // The instruction emulation subclass setup the unwind plan for the
    // first instruction.
    m_inst_emulator_ap->CreateFunctionEntryUnwind(unwind_plan);

    // CreateFunctionEntryUnwind should have created the first row. If it
    // doesn't, then we are done.
    if (unwind_plan.GetRowCount() == 0)
      return false;

    const bool prefer_file_cache = true;
    DisassemblerSP disasm_sp(Disassembler::DisassembleBytes(
        m_arch, NULL, NULL, range.GetBaseAddress(), opcode_data, opcode_size,
        99999, prefer_file_cache));

    Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));

    if (disasm_sp) {

      m_range_ptr = ⦥
      m_unwind_plan_ptr = &unwind_plan;

      const uint32_t addr_byte_size = m_arch.GetAddressByteSize();
      const bool show_address = true;
      const bool show_bytes = true;
      m_inst_emulator_ap->GetRegisterInfo(unwind_plan.GetRegisterKind(),
                                          unwind_plan.GetInitialCFARegister(),
                                          m_cfa_reg_info);

      m_fp_is_cfa = false;
      m_register_values.clear();
      m_pushed_regs.clear();

      // Initialize the CFA with a known value. In the 32 bit case
      // it will be 0x80000000, and in the 64 bit case 0x8000000000000000.
      // We use the address byte size to be safe for any future address sizes
      m_initial_sp = (1ull << ((addr_byte_size * 8) - 1));
      RegisterValue cfa_reg_value;
      cfa_reg_value.SetUInt(m_initial_sp, m_cfa_reg_info.byte_size);
      SetRegisterValue(m_cfa_reg_info, cfa_reg_value);

      const InstructionList &inst_list = disasm_sp->GetInstructionList();
      const size_t num_instructions = inst_list.GetSize();

      if (num_instructions > 0) {
        Instruction *inst = inst_list.GetInstructionAtIndex(0).get();
        const lldb::addr_t base_addr = inst->GetAddress().GetFileAddress();

        // Map for storing the unwind plan row and the value of the registers at
        // a given offset.
        // When we see a forward branch we add a new entry to this map with the
        // actual unwind plan
        // row and register context for the target address of the branch as the
        // current data have
        // to be valid for the target address of the branch too if we are in the
        // same function.
        std::map<lldb::addr_t, std::pair<UnwindPlan::RowSP, RegisterValueMap>>
            saved_unwind_states;

        // Make a copy of the current instruction Row and save it in m_curr_row
        // so we can add updates as we process the instructions.
        UnwindPlan::RowSP last_row = unwind_plan.GetLastRow();
        UnwindPlan::Row *newrow = new UnwindPlan::Row;
        if (last_row.get())
          *newrow = *last_row.get();
        m_curr_row.reset(newrow);

        // Add the initial state to the save list with offset 0.
        saved_unwind_states.insert({0, {last_row, m_register_values}});

        // cache the pc register number (in whatever register numbering this
        // UnwindPlan uses) for
        // quick reference during instruction parsing.
        RegisterInfo pc_reg_info;
        m_inst_emulator_ap->GetRegisterInfo(
            eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, pc_reg_info);

        // cache the return address register number (in whatever register
        // numbering this UnwindPlan uses) for
        // quick reference during instruction parsing.
        RegisterInfo ra_reg_info;
        m_inst_emulator_ap->GetRegisterInfo(
            eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA, ra_reg_info);

        // The architecture dependent condition code of the last processed
        // instruction.
        EmulateInstruction::InstructionCondition last_condition =
            EmulateInstruction::UnconditionalCondition;
        lldb::addr_t condition_block_start_offset = 0;

        for (size_t idx = 0; idx < num_instructions; ++idx) {
          m_curr_row_modified = false;
//.........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.........

bool UnwindAssembly_x86::AugmentUnwindPlanFromCallSite(
    AddressRange &func, Thread &thread, UnwindPlan &unwind_plan) {
  bool do_augment_unwindplan = true;

  UnwindPlan::RowSP first_row = unwind_plan.GetRowForFunctionOffset(0);
  UnwindPlan::RowSP last_row = unwind_plan.GetRowForFunctionOffset(-1);

  int wordsize = 8;
  ProcessSP process_sp(thread.GetProcess());
  if (process_sp.get() == nullptr)
    return false;

  wordsize = process_sp->GetTarget().GetArchitecture().GetAddressByteSize();

  RegisterNumber sp_regnum(thread, eRegisterKindGeneric,
                           LLDB_REGNUM_GENERIC_SP);
  RegisterNumber pc_regnum(thread, eRegisterKindGeneric,
                           LLDB_REGNUM_GENERIC_PC);

  // Does this UnwindPlan describe the prologue?  I want to see that the CFA is
  // set in terms of the stack pointer plus an offset, and I want to see that
  // rip is retrieved at the CFA-wordsize. If there is no description of the
  // prologue, don't try to augment this eh_frame unwinder code, fall back to
  // assembly parsing instead.

  if (first_row->GetCFAValue().GetValueType() !=
          UnwindPlan::Row::FAValue::isRegisterPlusOffset ||
      RegisterNumber(thread, unwind_plan.GetRegisterKind(),
                     first_row->GetCFAValue().GetRegisterNumber()) !=
          sp_regnum ||
      first_row->GetCFAValue().GetOffset() != wordsize) {
    return false;
  }
  UnwindPlan::Row::RegisterLocation first_row_pc_loc;
  if (!first_row->GetRegisterInfo(
          pc_regnu