def functionPreambleExpressionForObjectParameterAtIndex()

in fbchisellldbobjcruntimehelpers.py [0:0]

• 25 lines of code
• 8 McCabe index (conditional complexity)

def functionPreambleExpressionForObjectParameterAtIndex(parameterIndex):
    arch = currentArch()
    expresssion = None
    if arch == "i386":
        expresssion = "*(id*)($esp + " + str(12 + parameterIndex * 4) + ")"
    elif arch == "x86_64":
        if parameterIndex > 3:
            raise Exception(
                "Current implementation can not return object at index greater than 3 for x86_64"
            )
        registersList = ["rdx", "rcx", "r8", "r9"]
        expresssion = "(id)$" + registersList[parameterIndex]
    elif arch == "arm64":
        if parameterIndex > 5:
            raise Exception(
                "Current implementation can not return object at index greater than 5 for arm64"
            )
        expresssion = "(id)$x" + str(parameterIndex + 2)
    elif re.match(r"^armv.*$", arch):
        if parameterIndex > 1:
            raise Exception(
                "Current implementation can not return object at index greater than 1 for arm32"
            )
        expresssion = "(id)$r" + str(parameterIndex + 2)
    return expresssion