C++ Address::Slide方法代码示例

bool UnwindAssembly_x86::FirstNonPrologueInsn(
    AddressRange &func, const ExecutionContext &exe_ctx,
    Address &first_non_prologue_insn) {

  if (!func.GetBaseAddress().IsValid())
    return false;

  Target *target = exe_ctx.GetTargetPtr();
  if (target == nullptr)
    return false;

  if (m_assembly_inspection_engine == nullptr)
    return false;

  const bool prefer_file_cache = true;
  std::vector<uint8_t> function_text(func.GetByteSize());
  Status error;
  if (target->ReadMemory(func.GetBaseAddress(), prefer_file_cache,
                         function_text.data(), func.GetByteSize(),
                         error) == func.GetByteSize()) {
    size_t offset;
    if (m_assembly_inspection_engine->FindFirstNonPrologueInstruction(
            function_text.data(), func.GetByteSize(), offset)) {
      first_non_prologue_insn = func.GetBaseAddress();
      first_non_prologue_insn.Slide(offset);
    }
    return true;
  }
  return false;
}

bool
Block::GetStartAddress (Address &addr)
{
    if (m_ranges.IsEmpty())
        return false;

    Function *function = CalculateSymbolContextFunction();
    if (function)
    {
        addr = function->GetAddressRange().GetBaseAddress();
        addr.Slide(m_ranges.GetEntryRef(0).GetRangeBase ());
        return true;
    }
    return false;
}

uint32_t
Symbol::GetPrologueByteSize ()
{
    if (m_type == eSymbolTypeCode || m_type == eSymbolTypeResolver)
    {
        if (!m_type_data_resolved)
        {
            m_type_data_resolved = true;

            const Address &base_address = m_addr_range.GetBaseAddress();
            Function *function = base_address.CalculateSymbolContextFunction();
            if (function)
            {
                // Functions have line entries which can also potentially have end of prologue information.
                // So if this symbol points to a function, use the prologue information from there.
                m_type_data = function->GetPrologueByteSize();
            }
            else
            {
                ModuleSP module_sp (base_address.GetModule());
                SymbolContext sc;
                if (module_sp)
                {
                    uint32_t resolved_flags = module_sp->ResolveSymbolContextForAddress (base_address,
                                                                                         eSymbolContextLineEntry,
                                                                                         sc);
                    if (resolved_flags & eSymbolContextLineEntry)
                    {
                        // Default to the end of the first line entry.
                        m_type_data = sc.line_entry.range.GetByteSize();

                        // Set address for next line.
                        Address addr (base_address);
                        addr.Slide (m_type_data);

                        // Check the first few instructions and look for one that has a line number that is
                        // different than the first entry. This is also done in Function::GetPrologueByteSize().
                        uint16_t total_offset = m_type_data;
                        for (int idx = 0; idx < 6; ++idx)
                        {
                            SymbolContext sc_temp;
                            resolved_flags = module_sp->ResolveSymbolContextForAddress (addr, eSymbolContextLineEntry, sc_temp);
                            // Make sure we got line number information...
                            if (!(resolved_flags & eSymbolContextLineEntry))
                                break;

                            // If this line number is different than our first one, use it and we're done.
                            if (sc_temp.line_entry.line != sc.line_entry.line)
                            {
                                m_type_data = total_offset;
                                break;
                            }

                            // Slide addr up to the next line address.
                            addr.Slide (sc_temp.line_entry.range.GetByteSize());
                            total_offset += sc_temp.line_entry.range.GetByteSize();
                            // If we've gone too far, bail out.
                            if (total_offset >= m_addr_range.GetByteSize())
                                break;
                        }

                        // Sanity check - this may be a function in the middle of code that has debug information, but
                        // not for this symbol.  So the line entries surrounding us won't lie inside our function.
                        // In that case, the line entry will be bigger than we are, so we do that quick check and
                        // if that is true, we just return 0.
                        if (m_type_data >= m_addr_range.GetByteSize())
                            m_type_data = 0;
                    }
                    else
                    {
                        // TODO: expose something in Process to figure out the
                        // size of a function prologue.
                        m_type_data = 0;
                    }
                }
            }
        }
        return m_type_data;
    }
    return 0;
}

BreakpointLocationSP
BreakpointResolver::AddLocation(Address loc_addr, bool *new_location)
{
    loc_addr.Slide(m_offset);
    return m_breakpoint->AddLocation(loc_addr, new_location);
}