Standard ML of New Jersey

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Standard ML of New Jersey (abbreviated SML/NJ) is a compiler and programming environment for Standard ML. Aside from its runtime system, which is written in C, SML/NJ is written in Standard ML. It was developed jointly by Bell Laboratories and Princeton University.

Its name is a reference both to Princeton's home state and to Standard Oil of New Jersey, the famous oil monopoly of the early 20th century.


SML/NJ extends the SML'97 Basis Library with several additional top-level structures:

  • system info - this module provides information about the runtime system, such as the Operating System kind, type and version and whether or not the machine supports multiprocessing.
  • weak pointers - a weak pointer is one that is not sufficient to keep an object alive. If a heap value is referenced via ordinary pointers then it will remain alive, but if it is only referenced via weak pointers then it will be garbage collected.
  • lazy suspensions - this module implements the suspensions necessary for lazy evaluation (as opposed to eager evaluation).
  • compiler internals - SML/NJ provides access to several of the compiler internals, including methods to instantiate and modify the signal table.
  • unsafe access - these modules provide unsafe access to data structures and runtime-system functions.
  • compiler modules - SML/NJ also includes a structure that provides control of the ML compiler, which contains substructures for execution profiling, control of compiler error-message printing and warnings, and customizable pretty printing.

See also

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