有什么设计工具可以让我确切地获得C代码中不同功能的指令数量

Question

I need to analyze some c code with functions and I want to get the exact number of instructions of different function in c code. I have no idea. Thanks.

Answer 1

If you're talking about assembly instructions, this is pretty easy:

Make a small C program with main. Immediately in main, call your desired function. Compile with the gcc -c option (outputs an object file). Open up your object f ile (.o) in a text editor. Look for t he call function (This is the call into the function). Start counting the lines until you hit a return (ret) instruction.

There you go! Of course, your compiler will probably optimize this object code so it might be a little more complex, but this is probably a really easy way to do it.