Interactive GCC

Interactive GCC (igcc) is a read-eval-print loop (REPL) for C/C++ programmers.

It can be used like this:

$ ./igcc
g++> int a = 5;
g++> a += 2;
g++> cout << a << endl;
7
g++> --a;
g++> cout << a << endl;
6
g++>

It is possible to include header files you need like this:

$ ./igcc
g++> #include <vector>
g++> vector<int> myvec;
g++> myvec.push_back( 17 );
g++> printf( "%d\n", myvec.size() );
1
g++> myvec.push_back( 21 );
g++> printf( "%d\n", myvec.size() );
2
g++>

It is possible to include your own functions using '.f':

g++> .f
Functions paste mode is ON: Enter ".f" again to return to return to normal editing.

g++> int lastIndexOf(char *str, char c) {
g++>   int ind = -1;
g++>  for (int i=strlen(b)-1;i>=0;i--) {
g++>   if (b[i] == c) {
g++>     ind = i;
g++>     break;
g++>   }
g++>  }
g++>  return ind;
g++> }
g++> .f
Functions paste mode is OFF

You can use '.p' to enter "Paste" mode to enter multi line snippets :

g++> .p
Paste mode is ON: Enter ".p" again to return to return to normal editing.

g++> char c = '_';
g++> char *a = (char *)malloc(80);
g++> char b[] = "a_another_word_there_last";
g++> strcpy(a, b[lastIndexOf('_'));
g++> puts(a);
g++> .p
Paste mode is OFF

[Compile error - type .e to see it.]

Compile errors can be tolerated until the code works:

$ ./igcc
g++> #include <map>
g++> map<string,int> hits;
g++> hits["foo"] = 12;
g++> hits["bar"] = 15;
g++> for( map<string,int>::iterator it = hits.begin(); it != hits.end(); ++it )
[Compile error - type .e to see it.]
g++> {
[Compile error - type .e to see it.]
g++> 	cout << it->first << " " << it->second << endl;
[Compile error - type .e to see it.]
g++> }
bar 15
foo 12
g++>

Extra include directories can be supplied:

$ ./igcc -Itest/cpp -Itest/cpp2
g++> #include "hello.h"
g++> hello();
Hello,
g++> #include "world.h"
g++> world();
world!
g++>

Libs can be linked:

$ ./igcc -lm
g++> #include "math.h"
g++> cout << pow( 3, 3 ) << endl; // Actually a bad example since libm.a is already linked in C++
27
g++>

Your own libs can be linked too:

$ ./igcc -Itest/cpp -Ltest/cpp -lmylib
g++> #include "mylib.h"
g++> defined_in_cpp();
defined_in_cpp saying hello.
g++>

The cstdio, iostream and string headers are automatically included, and the std namespace is automatically in scope.

Copyright

Copyright (C) 2009 Andy Balaam Copyright (C) 2019 Zaoqi

IGCC is Free Software released under the terms of the GNU General Public License version 2 or later.

IGCC comes with NO WARRANTY.

See the file LICENSE for more information.