How can I see the assembly code for a C++ program?

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Ask the compiler

If you are building the program yourself, you can ask your compiler to emit assembly source. For most UNIX compilers use the -S switch.

  • If you are using the GNU assembler, compiling with -g -Wa,-alh will give intermixed source and assembly on stdout (-Wa asks compiler driver to pass options to assembler, -al turns on assembly listing, and -ah adds “high-level source” listing):

    g++ -g -c -Wa,-alh foo.cc

  • For Visual Studio, use /FAsc.

Peek into a binary

If you have a compiled binary,

Use your debugger

Debuggers could also show disassembly.

  • Use disas command in GDB.
    Use set disassembly-flavor intel if you prefer Intel syntax.
  • or the disassembly window of Visual Studio on Windows.

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