llvm-mc 命令

常用示例

说明

llvm-mc is the LLVM machine code playground. It assembles assembly source into machine code and disassembles machine code bytes back into assembly for various target architectures. It is useful for testing assembly syntax, examining instruction encodings, verifying assembler behavior, and low-level debugging. Input for assembly mode is an assembly source file. Input for disassembly mode (--disassemble) is hex-encoded bytes, which can be piped from stdin. When no input file is given, stdin is read.

参数

-filetype=_type_

Output file type: asm (assembly listing, default), obj (object file), or null (no output).

-triple=_triple_

Target triple for assembly/disassembly (e.g., x86_64-linux-gnu, aarch64-linux-gnu).

--disassemble, -disassemble

Disassemble hex-encoded input bytes into assembly.

-show-encoding

Print instruction encoding as comments alongside assembly output.

-show-inst

Show internal LLVM instruction representation in output.

-o _file_

Output file name (default: stdout).

-x86-asm-syntax=_syntax_

Assembly syntax for x86: att (default) or intel.

-mcpu=_cpu_

Specify target CPU for instruction selection.

-mattr=_attributes_

Target-specific attributes (e.g., +sse4.2,+avx).

-output-asm-variant=_N_

Select assembly output variant (0 = AT&T, 1 = Intel for x86).

-g

Generate DWARF debug information in object output.