Ghidra: Ghidra API GetFunctionContaining not working

[aosti]

Describe the bug
I created a custom script to create functions and search specific instructions inside of those functions. After getting the address of a single instruction, I tried to call the getFunctionContaining(address), but it always returns null.
I'm not using the auto analysis feature, on the contrary, I'm running with the -noanalysis parameter.

To Reproduce
Steps to reproduce the behaviour:

1. Analyse a binary through script only
2. Get the address of an instruction
3. Try to get the function containing the instruction with getFunctionContaining
4. Receive a null pointer

Expected behaviour
I expected the getFunctionContaining to actually return the address.

Screenshots
Nope.

Attachments
Nope.

Environment (please complete the following information):

• OS: MacOs Catalina 10.15
• Java Version: 12
• Ghidra Version: 9.1-Beta

Additional context
-> The functions I defined contain multiple references to unknown addresses as jal (Address that does not exist on file)
-> I'm not executing the auto analysis from ghidra because the binary under analysis is not an executable file, it is a firmware for an embedded device.
-> GetFunctionBefore works.

[astrelsky]

getFunctionContaining will return null if no function contains the specified address.
As a sanity check you can check if a defined function contains an address through the FunctionManager interface.

currentProgram.getFunctionManager().isInFunction(currentAddress) will return True if the program has a defined function containing the specified address.

[aosti]

It also returned false. I find it strange, because the disassembler shows the instructions as belonging to a single function. All of the functions were created using FlatProgramAPI.createFunction(address, null).

[ghidra1]

If the FlatProgramAPI.createFunction was performed prior to disassembly of the instructions within the new function, the function will not have a body. With auto-analysis disabled the update of the function body will be performed. It's unclear when and how your disassembly was performed in relation to function creation.

[aosti]

I'm calling createFunction and then disassembling.

[ghidra1]

Try reversing the order.

[aosti]

Yeap, it works. :)