1. A method, comprising: receiving, during execution of a first code, an indication that a roll over from executing the first code to executing a second code is required, wherein the second code acts as a fallback code to the first code, and wherein the fallback code is associated with the first code; determining, prior to execution of the second code, that the second code is to begin execution at a portion of the second code other than a starting portion of the second code; constructing a runtime state for the second code, including constructing at least a portion of a function stack that includes at least one value that would have been generated had the second code been executed at the starting portion of the second code; and initiating execution of the portion of the second code other than the starting portion of the second code.