| //===-- UnwindAssemblyInstEmulation.cpp --------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "UnwindAssemblyInstEmulation.h" |
| |
| #include "lldb/Core/Address.h" |
| #include "lldb/Core/ArchSpec.h" |
| #include "lldb/Core/DataBufferHeap.h" |
| #include "lldb/Core/DataExtractor.h" |
| #include "lldb/Core/Disassembler.h" |
| #include "lldb/Core/Error.h" |
| #include "lldb/Core/FormatEntity.h" |
| #include "lldb/Core/Log.h" |
| #include "lldb/Core/PluginManager.h" |
| #include "lldb/Core/StreamString.h" |
| #include "lldb/Target/ExecutionContext.h" |
| #include "lldb/Target/Process.h" |
| #include "lldb/Target/Thread.h" |
| #include "lldb/Target/Target.h" |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| |
| |
| //----------------------------------------------------------------------------------------------- |
| // UnwindAssemblyInstEmulation method definitions |
| //----------------------------------------------------------------------------------------------- |
| |
| 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 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); |
| |
| for (size_t idx=0; idx<num_instructions; ++idx) |
| { |
| m_curr_row_modified = false; |
| m_forward_branch_offset = 0; |
| |
| inst = inst_list.GetInstructionAtIndex (idx).get(); |
| if (inst) |
| { |
| lldb::addr_t current_offset = inst->GetAddress().GetFileAddress() - base_addr; |
| auto it = saved_unwind_states.upper_bound(current_offset); |
| assert(it != saved_unwind_states.begin() && "Unwind row for the function entry missing"); |
| --it; // Move it to the row corresponding to the current offset |
| |
| // If the offset of m_curr_row don't match with the offset we see in saved_unwind_states |
| // then we have to update m_curr_row and m_register_values based on the saved values. It |
| // is happenning after we processed an epilogue and a return to caller instruction. |
| if (it->second.first->GetOffset() != m_curr_row->GetOffset()) |
| { |
| UnwindPlan::Row *newrow = new UnwindPlan::Row; |
| *newrow = *it->second.first; |
| m_curr_row.reset(newrow); |
| m_register_values = it->second.second;; |
| } |
| |
| if (log && log->GetVerbose ()) |
| { |
| StreamString strm; |
| lldb_private::FormatEntity::Entry format; |
| FormatEntity::Parse("${frame.pc}: ", format); |
| inst->Dump(&strm, inst_list.GetMaxOpcocdeByteSize (), show_address, show_bytes, NULL, NULL, NULL, &format, 0); |
| log->PutCString (strm.GetData()); |
| } |
| |
| m_inst_emulator_ap->SetInstruction (inst->GetOpcode(), |
| inst->GetAddress(), |
| exe_ctx.GetTargetPtr()); |
| |
| m_inst_emulator_ap->EvaluateInstruction (eEmulateInstructionOptionIgnoreConditions); |
| |
| // If the current instruction is a branch forward then save the current CFI information |
| // for the offset where we are branching. |
| if (m_forward_branch_offset != 0 && range.ContainsFileAddress(inst->GetAddress().GetFileAddress() + m_forward_branch_offset)) |
| { |
| auto newrow = std::make_shared<UnwindPlan::Row>(*m_curr_row.get()); |
| newrow->SetOffset(current_offset + m_forward_branch_offset); |
| saved_unwind_states.insert({current_offset + m_forward_branch_offset, {newrow, m_register_values}}); |
| unwind_plan.InsertRow(newrow); |
| } |
| |
| // Were there any changes to the CFI while evaluating this instruction? |
| if (m_curr_row_modified) |
| { |
| // Save the modified row if we don't already have a CFI row in the currennt address |
| if (saved_unwind_states.count(current_offset + inst->GetOpcode().GetByteSize()) == 0) |
| { |
| m_curr_row->SetOffset (current_offset + inst->GetOpcode().GetByteSize()); |
| unwind_plan.InsertRow (m_curr_row); |
| saved_unwind_states.insert({current_offset + inst->GetOpcode().GetByteSize(), {m_curr_row, m_register_values}}); |
| |
| // Allocate a new Row for m_curr_row, copy the current state into it |
| UnwindPlan::Row *newrow = new UnwindPlan::Row; |
| *newrow = *m_curr_row.get(); |
| m_curr_row.reset(newrow); |
| } |
| } |
| } |
| } |
| } |
| // FIXME: The DisassemblerLLVMC has a reference cycle and won't go away if it has any active instructions. |
| // I'll fix that but for now, just clear the list and it will go away nicely. |
| disasm_sp->GetInstructionList().Clear(); |
| } |
| |
| if (log && log->GetVerbose ()) |
| { |
| StreamString strm; |
| lldb::addr_t base_addr = range.GetBaseAddress().GetLoadAddress(thread.CalculateTarget().get()); |
| strm.Printf ("Resulting unwind rows for [0x%" PRIx64 " - 0x%" PRIx64 "):", base_addr, base_addr + range.GetByteSize()); |
| unwind_plan.Dump(strm, &thread, base_addr); |
| log->PutCString (strm.GetData()); |
| } |
| return unwind_plan.GetRowCount() > 0; |
| } |
| return false; |
| } |
| |
| bool |
| UnwindAssemblyInstEmulation::AugmentUnwindPlanFromCallSite (AddressRange& func, |
| Thread& thread, |
| UnwindPlan& unwind_plan) |
| { |
| return false; |
| } |
| |
| bool |
| UnwindAssemblyInstEmulation::GetFastUnwindPlan (AddressRange& func, |
| Thread& thread, |
| UnwindPlan &unwind_plan) |
| { |
| return false; |
| } |
| |
| bool |
| UnwindAssemblyInstEmulation::FirstNonPrologueInsn (AddressRange& func, |
| const ExecutionContext &exe_ctx, |
| Address& first_non_prologue_insn) |
| { |
| return false; |
| } |
| |
| UnwindAssembly * |
| UnwindAssemblyInstEmulation::CreateInstance (const ArchSpec &arch) |
| { |
| std::unique_ptr<EmulateInstruction> inst_emulator_ap (EmulateInstruction::FindPlugin (arch, eInstructionTypePrologueEpilogue, NULL)); |
| // Make sure that all prologue instructions are handled |
| if (inst_emulator_ap.get()) |
| return new UnwindAssemblyInstEmulation (arch, inst_emulator_ap.release()); |
| return NULL; |
| } |
| |
| |
| //------------------------------------------------------------------ |
| // PluginInterface protocol in UnwindAssemblyParser_x86 |
| //------------------------------------------------------------------ |
| ConstString |
| UnwindAssemblyInstEmulation::GetPluginName() |
| { |
| return GetPluginNameStatic(); |
| } |
| |
| uint32_t |
| UnwindAssemblyInstEmulation::GetPluginVersion() |
| { |
| return 1; |
| } |
| |
| void |
| UnwindAssemblyInstEmulation::Initialize() |
| { |
| PluginManager::RegisterPlugin (GetPluginNameStatic(), |
| GetPluginDescriptionStatic(), |
| CreateInstance); |
| } |
| |
| void |
| UnwindAssemblyInstEmulation::Terminate() |
| { |
| PluginManager::UnregisterPlugin (CreateInstance); |
| } |
| |
| |
| ConstString |
| UnwindAssemblyInstEmulation::GetPluginNameStatic() |
| { |
| static ConstString g_name("inst-emulation"); |
| return g_name; |
| } |
| |
| const char * |
| UnwindAssemblyInstEmulation::GetPluginDescriptionStatic() |
| { |
| return "Instruction emulation based unwind information."; |
| } |
| |
| |
| uint64_t |
| UnwindAssemblyInstEmulation::MakeRegisterKindValuePair (const RegisterInfo ®_info) |
| { |
| lldb::RegisterKind reg_kind; |
| uint32_t reg_num; |
| if (EmulateInstruction::GetBestRegisterKindAndNumber (®_info, reg_kind, reg_num)) |
| return (uint64_t)reg_kind << 24 | reg_num; |
| return 0ull; |
| } |
| |
| void |
| UnwindAssemblyInstEmulation::SetRegisterValue (const RegisterInfo ®_info, const RegisterValue ®_value) |
| { |
| m_register_values[MakeRegisterKindValuePair (reg_info)] = reg_value; |
| } |
| |
| bool |
| UnwindAssemblyInstEmulation::GetRegisterValue (const RegisterInfo ®_info, RegisterValue ®_value) |
| { |
| const uint64_t reg_id = MakeRegisterKindValuePair (reg_info); |
| RegisterValueMap::const_iterator pos = m_register_values.find(reg_id); |
| if (pos != m_register_values.end()) |
| { |
| reg_value = pos->second; |
| return true; // We had a real value that comes from an opcode that wrote |
| // to it... |
| } |
| // We are making up a value that is recognizable... |
| reg_value.SetUInt(reg_id, reg_info.byte_size); |
| return false; |
| } |
| |
| |
| size_t |
| UnwindAssemblyInstEmulation::ReadMemory (EmulateInstruction *instruction, |
| void *baton, |
| const EmulateInstruction::Context &context, |
| lldb::addr_t addr, |
| void *dst, |
| size_t dst_len) |
| { |
| Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); |
| |
| if (log && log->GetVerbose ()) |
| { |
| StreamString strm; |
| strm.Printf ("UnwindAssemblyInstEmulation::ReadMemory (addr = 0x%16.16" PRIx64 ", dst = %p, dst_len = %" PRIu64 ", context = ", |
| addr, |
| dst, |
| (uint64_t)dst_len); |
| context.Dump(strm, instruction); |
| log->PutCString (strm.GetData ()); |
| } |
| memset (dst, 0, dst_len); |
| return dst_len; |
| } |
| |
| size_t |
| UnwindAssemblyInstEmulation::WriteMemory (EmulateInstruction *instruction, |
| void *baton, |
| const EmulateInstruction::Context &context, |
| lldb::addr_t addr, |
| const void *dst, |
| size_t dst_len) |
| { |
| if (baton && dst && dst_len) |
| return ((UnwindAssemblyInstEmulation *)baton)->WriteMemory (instruction, context, addr, dst, dst_len); |
| return 0; |
| } |
| |
| size_t |
| UnwindAssemblyInstEmulation::WriteMemory (EmulateInstruction *instruction, |
| const EmulateInstruction::Context &context, |
| lldb::addr_t addr, |
| const void *dst, |
| size_t dst_len) |
| { |
| DataExtractor data (dst, |
| dst_len, |
| instruction->GetArchitecture ().GetByteOrder(), |
| instruction->GetArchitecture ().GetAddressByteSize()); |
| |
| Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); |
| |
| if (log && log->GetVerbose ()) |
| { |
| StreamString strm; |
| |
| strm.PutCString ("UnwindAssemblyInstEmulation::WriteMemory ("); |
| data.Dump(&strm, 0, eFormatBytes, 1, dst_len, UINT32_MAX, addr, 0, 0); |
| strm.PutCString (", context = "); |
| context.Dump(strm, instruction); |
| log->PutCString (strm.GetData()); |
| } |
| |
| const bool cant_replace = false; |
| |
| switch (context.type) |
| { |
| default: |
| case EmulateInstruction::eContextInvalid: |
| case EmulateInstruction::eContextReadOpcode: |
| case EmulateInstruction::eContextImmediate: |
| case EmulateInstruction::eContextAdjustBaseRegister: |
| case EmulateInstruction::eContextRegisterPlusOffset: |
| case EmulateInstruction::eContextAdjustPC: |
| case EmulateInstruction::eContextRegisterStore: |
| case EmulateInstruction::eContextRegisterLoad: |
| case EmulateInstruction::eContextRelativeBranchImmediate: |
| case EmulateInstruction::eContextAbsoluteBranchRegister: |
| case EmulateInstruction::eContextSupervisorCall: |
| case EmulateInstruction::eContextTableBranchReadMemory: |
| case EmulateInstruction::eContextWriteRegisterRandomBits: |
| case EmulateInstruction::eContextWriteMemoryRandomBits: |
| case EmulateInstruction::eContextArithmetic: |
| case EmulateInstruction::eContextAdvancePC: |
| case EmulateInstruction::eContextReturnFromException: |
| case EmulateInstruction::eContextPopRegisterOffStack: |
| case EmulateInstruction::eContextAdjustStackPointer: |
| break; |
| |
| case EmulateInstruction::eContextPushRegisterOnStack: |
| { |
| uint32_t reg_num = LLDB_INVALID_REGNUM; |
| uint32_t generic_regnum = LLDB_INVALID_REGNUM; |
| if (context.info_type == EmulateInstruction::eInfoTypeRegisterToRegisterPlusOffset) |
| { |
| const uint32_t unwind_reg_kind = m_unwind_plan_ptr->GetRegisterKind(); |
| reg_num = context.info.RegisterToRegisterPlusOffset.data_reg.kinds[unwind_reg_kind]; |
| generic_regnum = context.info.RegisterToRegisterPlusOffset.data_reg.kinds[eRegisterKindGeneric]; |
| } |
| else |
| assert (!"unhandled case, add code to handle this!"); |
| |
| if (reg_num != LLDB_INVALID_REGNUM && generic_regnum != LLDB_REGNUM_GENERIC_SP) |
| { |
| if (m_pushed_regs.find (reg_num) == m_pushed_regs.end()) |
| { |
| m_pushed_regs[reg_num] = addr; |
| const int32_t offset = addr - m_initial_sp; |
| m_curr_row->SetRegisterLocationToAtCFAPlusOffset (reg_num, offset, cant_replace); |
| m_curr_row_modified = true; |
| } |
| } |
| } |
| break; |
| |
| } |
| |
| return dst_len; |
| } |
| |
| bool |
| UnwindAssemblyInstEmulation::ReadRegister (EmulateInstruction *instruction, |
| void *baton, |
| const RegisterInfo *reg_info, |
| RegisterValue ®_value) |
| { |
| |
| if (baton && reg_info) |
| return ((UnwindAssemblyInstEmulation *)baton)->ReadRegister (instruction, reg_info, reg_value); |
| return false; |
| } |
| bool |
| UnwindAssemblyInstEmulation::ReadRegister (EmulateInstruction *instruction, |
| const RegisterInfo *reg_info, |
| RegisterValue ®_value) |
| { |
| bool synthetic = GetRegisterValue (*reg_info, reg_value); |
| |
| Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); |
| |
| if (log && log->GetVerbose ()) |
| { |
| |
| StreamString strm; |
| strm.Printf ("UnwindAssemblyInstEmulation::ReadRegister (name = \"%s\") => synthetic_value = %i, value = ", reg_info->name, synthetic); |
| reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); |
| log->PutCString(strm.GetData()); |
| } |
| return true; |
| } |
| |
| bool |
| UnwindAssemblyInstEmulation::WriteRegister (EmulateInstruction *instruction, |
| void *baton, |
| const EmulateInstruction::Context &context, |
| const RegisterInfo *reg_info, |
| const RegisterValue ®_value) |
| { |
| if (baton && reg_info) |
| return ((UnwindAssemblyInstEmulation *)baton)->WriteRegister (instruction, context, reg_info, reg_value); |
| return false; |
| } |
| bool |
| UnwindAssemblyInstEmulation::WriteRegister (EmulateInstruction *instruction, |
| const EmulateInstruction::Context &context, |
| const RegisterInfo *reg_info, |
| const RegisterValue ®_value) |
| { |
| Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); |
| |
| if (log && log->GetVerbose ()) |
| { |
| |
| StreamString strm; |
| strm.Printf ("UnwindAssemblyInstEmulation::WriteRegister (name = \"%s\", value = ", reg_info->name); |
| reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); |
| strm.PutCString (", context = "); |
| context.Dump(strm, instruction); |
| log->PutCString(strm.GetData()); |
| } |
| |
| if (!instruction->IsInstructionConditional()) |
| SetRegisterValue (*reg_info, reg_value); |
| |
| switch (context.type) |
| { |
| case EmulateInstruction::eContextInvalid: |
| case EmulateInstruction::eContextReadOpcode: |
| case EmulateInstruction::eContextImmediate: |
| case EmulateInstruction::eContextAdjustBaseRegister: |
| case EmulateInstruction::eContextRegisterPlusOffset: |
| case EmulateInstruction::eContextAdjustPC: |
| case EmulateInstruction::eContextRegisterStore: |
| case EmulateInstruction::eContextSupervisorCall: |
| case EmulateInstruction::eContextTableBranchReadMemory: |
| case EmulateInstruction::eContextWriteRegisterRandomBits: |
| case EmulateInstruction::eContextWriteMemoryRandomBits: |
| case EmulateInstruction::eContextArithmetic: |
| case EmulateInstruction::eContextAdvancePC: |
| case EmulateInstruction::eContextReturnFromException: |
| case EmulateInstruction::eContextPushRegisterOnStack: |
| case EmulateInstruction::eContextRegisterLoad: |
| // { |
| // const uint32_t reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; |
| // if (reg_num != LLDB_INVALID_REGNUM) |
| // { |
| // const bool can_replace_only_if_unspecified = true; |
| // |
| // m_curr_row.SetRegisterLocationToUndefined (reg_num, |
| // can_replace_only_if_unspecified, |
| // can_replace_only_if_unspecified); |
| // m_curr_row_modified = true; |
| // } |
| // } |
| break; |
| |
| case EmulateInstruction::eContextAbsoluteBranchRegister: |
| case EmulateInstruction::eContextRelativeBranchImmediate: |
| { |
| if (context.info_type == EmulateInstruction::eInfoTypeISAAndImmediate && |
| context.info.ISAAndImmediate.unsigned_data32 > 0) |
| { |
| m_forward_branch_offset = context.info.ISAAndImmediateSigned.signed_data32; |
| } |
| else if (context.info_type == EmulateInstruction::eInfoTypeISAAndImmediateSigned && |
| context.info.ISAAndImmediateSigned.signed_data32 > 0) |
| { |
| m_forward_branch_offset = context.info.ISAAndImmediate.unsigned_data32; |
| } |
| else if (context.info_type == EmulateInstruction::eInfoTypeImmediate && |
| context.info.unsigned_immediate > 0) |
| { |
| m_forward_branch_offset = context.info.unsigned_immediate; |
| } |
| else if (context.info_type == EmulateInstruction::eInfoTypeImmediateSigned && |
| context.info.signed_immediate > 0) |
| { |
| m_forward_branch_offset = context.info.signed_immediate; |
| } |
| } |
| break; |
| |
| case EmulateInstruction::eContextPopRegisterOffStack: |
| { |
| if (!instruction->IsInstructionConditional()) |
| { |
| const uint32_t reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; |
| const uint32_t generic_regnum = reg_info->kinds[eRegisterKindGeneric]; |
| if (reg_num != LLDB_INVALID_REGNUM && generic_regnum != LLDB_REGNUM_GENERIC_SP) |
| { |
| switch (context.info_type) |
| { |
| case EmulateInstruction::eInfoTypeAddress: |
| if (m_pushed_regs.find(reg_num) != m_pushed_regs.end() && |
| context.info.address == m_pushed_regs[reg_num]) |
| { |
| m_curr_row->SetRegisterLocationToSame(reg_num, |
| false /*must_replace*/); |
| m_curr_row_modified = true; |
| } |
| break; |
| case EmulateInstruction::eInfoTypeISA: |
| assert((generic_regnum == LLDB_REGNUM_GENERIC_PC || |
| generic_regnum == LLDB_REGNUM_GENERIC_FLAGS) && |
| "eInfoTypeISA used for poping a register other the the PC/FLAGS"); |
| if (generic_regnum != LLDB_REGNUM_GENERIC_FLAGS) |
| { |
| m_curr_row->SetRegisterLocationToSame(reg_num, |
| false /*must_replace*/); |
| m_curr_row_modified = true; |
| } |
| break; |
| default: |
| assert(false && "unhandled case, add code to handle this!"); |
| break; |
| } |
| } |
| } |
| } |
| break; |
| |
| case EmulateInstruction::eContextSetFramePointer: |
| if (!m_fp_is_cfa && !instruction->IsInstructionConditional()) |
| { |
| m_fp_is_cfa = true; |
| m_cfa_reg_info = *reg_info; |
| const uint32_t cfa_reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; |
| assert (cfa_reg_num != LLDB_INVALID_REGNUM); |
| m_curr_row->GetCFAValue().SetIsRegisterPlusOffset(cfa_reg_num, m_initial_sp - |
| reg_value.GetAsUInt64()); |
| m_curr_row_modified = true; |
| } |
| break; |
| |
| case EmulateInstruction::eContextAdjustStackPointer: |
| // If we have created a frame using the frame pointer, don't follow |
| // subsequent adjustments to the stack pointer. |
| if (!m_fp_is_cfa && !instruction->IsInstructionConditional()) |
| { |
| m_curr_row->GetCFAValue().SetIsRegisterPlusOffset( |
| m_curr_row->GetCFAValue().GetRegisterNumber(), |
| m_initial_sp - reg_value.GetAsUInt64()); |
| m_curr_row_modified = true; |
| } |
| break; |
| } |
| return true; |
| } |
| |
| |