1. A computer-implemented method, comprising: during run-time of an operating system process executing at a computer system: compiling, within the operating system process, one or more segments of code to produce and store a high-level intermediate representation of the one or more segments of code in volatile memory, wherein the high-level intermediate representation is user-inspectable and user-modifiable within the operating system process while the high-level intermediate representation is stored in the volatile memory during run-time of the operating system process without executing the high-level intermediate representation and without starting another process, the high-level intermediate representation stored in the volatile memory without being output to a file.