C++ compiler as a lib function?

This is a discussion on C++ compiler as a lib function? within the C++ Programming forums, part of the General Programming Boards category; I would like to pass a string of valid C++ code to a library function which compiles it to machine ...

  1. #1
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    C++ compiler as a lib function?

    I would like to pass a string of valid C++ code to a library function which compiles it to machine code and returns it. Then I should be able to call another lib function which executes it. I want the compiler to be all memory resident involving no file operations during compilation. Does it exist?

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    Registered User jeffcobb's Avatar
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    Not to my knowledge but then I don't know of anyone outside of a trojan or worm writer that wanted such a thing. There are other ways to accomplish this if your requirements are adjusted somewhat...like going with python code->bytecode, stuff like that. What purpose is served by forcing the compiler to be entirely memory-resident?
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    I know I can accomplish this in other languages. I've been using javascript and perl which both have eval functions, although the string is interpreted and not compiled I think.

    I want it in C++ to evaluate user input which is a C expression or close. I could complete it to a C prog and compile it in the usual way from the program, but it's slow. That's why I want it all in memory: speed.

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    C++ Witch laserlight's Avatar
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    I have never tried it, but perhaps you should take a look at Ch.
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    Quote Originally Posted by laserlight View Post
    I have never tried it, but perhaps you should take a look at Ch.
    Thanks for the tip. Very interesting. Worth trying.

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    spurious conceit MK27's Avatar
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    Quote Originally Posted by mustermeister View Post
    I want it in C++ to evaluate user input which is a C expression or close. I could complete it to a C prog and compile it in the usual way from the program, but it's slow. That's why I want it all in memory: speed.
    If it is just for single expressions, ie, you are talking about some kind of command line interpreter such as available in perl and other interpreted languages (and with js too in the form of some online things, I think w3c has one), where "the user" is literally someone typing at a keyboard, this will not be slow at all.
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    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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