def loadChiselIfNecessary()

in commands/FBDebugCommands.py [0:0]
27 lines of code
11 McCabe index (conditional complexity)

    def loadChiselIfNecessary(self):
        target = lldb.debugger.GetSelectedTarget()
        symbol_contexts = target.FindSymbols("PrintInstances", lldb.eSymbolTypeCode)
        if any(ctx.symbol.IsValid() for ctx in symbol_contexts):
            return True

        path = self.chiselLibraryPath()
        if not os.path.exists(path):
            print("Chisel library missing: " + path)
            return False

        module = fb.evaluateExpressionValue('(void*)dlopen("{}", 2)'.format(path))
        if module.unsigned != 0 or target.module["Chisel"]:
            return True

        # `errno` is a macro that expands to a call to __error(). In development,
        # lldb was not getting a correct value for `errno`, so `__error()` is used.
        errno = fb.evaluateExpressionValue("*(int*)__error()").value
        error = fb.evaluateExpressionValue("(char*)dlerror()")
        if errno == 50:
            # KERN_CODESIGN_ERROR from <mach/kern_return.h>
            print("Error loading Chisel: Code signing failure; Must re-run codesign")
        elif error.unsigned != 0:
            print("Error loading Chisel: " + error.summary)
        elif errno != 0:
            error = fb.evaluateExpressionValue("(char*)strerror({})".format(errno))
            if error.unsigned != 0:
                print("Error loading Chisel: " + error.summary)
            else:
                print("Error loading Chisel (errno {})".format(errno))
        else:
            print("Unknown error loading Chisel")

        return False