Function call sequence for each function

[sajjadirn]

I have this python script which extracts the function calls for each function

for f1 in currentProgram.getListing().getFunctions(True):
    fun_calls.append(str(f1.getCalledFunctions(ghidra.util.task.TaskMonitor.DUMMY)))

for function X I get an output like: __alloca, _strcmp, _printf, _scanf, ___main

Is there a way in which I get the output based on the order of function calls, for example if _strcmp is called first followed by _scanf etc I want an output like: _strcmp, _scanf, etc...

[astrelsky]

You would have to iterate over the functions instructions, find the corresponding call and sort by the calling instructions address. With that said it's more efficient in this situation to just go right to iterating over the instructions and avoid the duplicate work.

[sajjadirn]

@astrelsky Thank you for your reply, I didn't quite understand what you meant by it's more efficient in this situation to just go right to iterating over the instructions and avoid the duplicate work.

If I iterate through complete instruction set, how will I get the function call sequence for each function.

[astrelsky]

@astrelsky Thank you for your reply, I didn't quite understand what you meant by it's more efficient in this situation to just go right to iterating over the instructions and avoid the duplicate work.

If I iterate through complete instruction set, how will I get the function call sequence for each function.

This will not get indirect function calls that the decompiler can resolve. However, neither does Function.getCalledFunctions.

def get_calls(fun):
    for inst in currentProgram.listing.getInstructions(fun.body, True):
        if not inst.flows:
            continue
        for op in inst.pcode:
            if op.opcode != op.CALL:
                continue
            yield getFunctionAt(inst.flows[0])
            break

[sajjadirn]

@astrelsky Thank you again, but when I pass any function name to get_calls, it always returns None. Am I doing something wrong?

[astrelsky]

@astrelsky Thank you again, but when I pass any function name to get_calls, it always returns None. Am I doing something wrong?

Pass a Function not it's name. It will return a generator.

[sajjadirn]

@astrelsky Thank you so much!

[sajjadirn]

btw this does not return to calls made to external functions, for example in the assembly code, if this call is made, the script does not give this in the output CALL dword ptr [->KERNEL32.DLL::GetFileAttributesA ]

Do you know, if this can be extracted too? Thank you @astrelsky

[astrelsky]

btw this does not return to calls made to external functions, for example in the assembly code, if this call is made, the script does not give this in the output CALL dword ptr [->KERNEL32.DLL::GetFileAttributesA ]

Do you know, if this can be extracted too? Thank you @astrelsky

Change it to the following:

def get_calls(fun):
    for inst in currentProgram.listing.getInstructions(fun.body, True):
        if not inst.flows:
            continue
        for op in inst.pcode:
            if op.opcode not in [op.CALL, op.CALLIND]:
                continue
            yield getFunctionAt(inst.flows[0])
            break

[sajjadirn]

Thank you so much man! this is what i needed @astrelsky