Forward Declaration

[rald]

How can I forward declare a function?

[tch0]

You can create a list to save the address of these jump address in code segment that declared but not defined function calls, and function's hash too. Then fill these address after parsing the whole file. Of course, parsing declarations is necessary.

[andrakis]

Without changes to c4, you cannot forward declare. The changes are not insignificant to make it work.

You could instead try reordering your functions so that they don't need forward declarations.

[tch0]

When you call functions mutually, forward declarations will be necessary. What I said is the way to change c4.

[RedContritio]

Before discussing call mutually, I don't think it's a good design which has interdependency.
You shall make dependence be a chain, but not a ring.

[tch0]

Most of the time, we do not need call functions mutually, or you can say it should be avoided. But sometimes, it's inevitable and convenient in some special cases like recursive descent or recursive implementation of AVL tree.