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C++ DataExtractor::BytesLeft方法代码示例

本文整理汇总了C++中lldb_private::DataExtractor::BytesLeft方法的典型用法代码示例。如果您正苦于以下问题:C++ DataExtractor::BytesLeft方法的具体用法?C++ DataExtractor::BytesLeft怎么用?C++ DataExtractor::BytesLeft使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在lldb_private::DataExtractor的用法示例。


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示例1: Decode

    virtual size_t
    Decode (const lldb_private::Disassembler &disassembler,
            const lldb_private::DataExtractor &data,
            lldb::offset_t data_offset)
    {
        // All we have to do is read the opcode which can be easy for some
        // architectures
        bool got_op = false;
        DisassemblerLLVMC &llvm_disasm = GetDisassemblerLLVMC();
        const ArchSpec &arch = llvm_disasm.GetArchitecture();
        const lldb::ByteOrder byte_order = data.GetByteOrder();
        
        const uint32_t min_op_byte_size = arch.GetMinimumOpcodeByteSize();
        const uint32_t max_op_byte_size = arch.GetMaximumOpcodeByteSize();
        if (min_op_byte_size == max_op_byte_size)
        {
            // Fixed size instructions, just read that amount of data.
            if (!data.ValidOffsetForDataOfSize(data_offset, min_op_byte_size))
                return false;

            switch (min_op_byte_size)
            {
                case 1:
                    m_opcode.SetOpcode8  (data.GetU8  (&data_offset), byte_order);
                    got_op = true;
                    break;

                case 2:
                    m_opcode.SetOpcode16 (data.GetU16 (&data_offset), byte_order);
                    got_op = true;
                    break;

                case 4:
                    m_opcode.SetOpcode32 (data.GetU32 (&data_offset), byte_order);
                    got_op = true;
                    break;

                case 8:
                    m_opcode.SetOpcode64 (data.GetU64 (&data_offset), byte_order);
                    got_op = true;
                    break;

                default:
                    m_opcode.SetOpcodeBytes(data.PeekData(data_offset, min_op_byte_size), min_op_byte_size);
                    got_op = true;
                    break;
            }
        }
        if (!got_op)
        {
            bool is_alternate_isa = false;
            DisassemblerLLVMC::LLVMCDisassembler *mc_disasm_ptr = GetDisasmToUse (is_alternate_isa);
            
            const llvm::Triple::ArchType machine = arch.GetMachine();
            if (machine == llvm::Triple::arm || machine == llvm::Triple::thumb)
            {
                if (machine == llvm::Triple::thumb || is_alternate_isa)
                {
                    uint32_t thumb_opcode = data.GetU16(&data_offset);
                    if ((thumb_opcode & 0xe000) != 0xe000 || ((thumb_opcode & 0x1800u) == 0))
                    {
                        m_opcode.SetOpcode16 (thumb_opcode, byte_order);
                        m_is_valid = true;
                    }
                    else
                    {
                        thumb_opcode <<= 16;
                        thumb_opcode |= data.GetU16(&data_offset);
                        m_opcode.SetOpcode16_2 (thumb_opcode, byte_order);
                        m_is_valid = true;
                    }
                }
                else
                {
                    m_opcode.SetOpcode32 (data.GetU32(&data_offset), byte_order);
                    m_is_valid = true;
                }
            }
            else
            {
                // The opcode isn't evenly sized, so we need to actually use the llvm
                // disassembler to parse it and get the size.
                uint8_t *opcode_data = const_cast<uint8_t *>(data.PeekData (data_offset, 1));
                const size_t opcode_data_len = data.BytesLeft(data_offset);
                const addr_t pc = m_address.GetFileAddress();
                llvm::MCInst inst;
                
                llvm_disasm.Lock(this, NULL);
                const size_t inst_size = mc_disasm_ptr->GetMCInst(opcode_data,
                                                                  opcode_data_len,
                                                                  pc,
                                                                  inst);
                llvm_disasm.Unlock();
                if (inst_size == 0)
                    m_opcode.Clear();
                else
                {
                    m_opcode.SetOpcodeBytes(opcode_data, inst_size);
                    m_is_valid = true;
                }
//.........这里部分代码省略.........
开发者ID:VanirLLVM,项目名称:toolchain_lldb,代码行数:101,代码来源:DisassemblerLLVMC.cpp


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