The Amber Machine
نویسنده
چکیده
The Amber machine is a stack machine designed as an intermediate language for compiling higher-order languages. The current version is specialized for the Amber language. The machine supports a set of basic and structured data types, functional closures, signals, bitmap graphics, persistent objects and meta-level execution. The latter is needed as the Amber compiler is entirely written in Amber (above the Amber machine level) and needs to switch level when executing a program it has just compiled. A set of implementation strategies are admissible for this machine, including byte-code interpretation, threaded code interpretation and compilation to native code. The current implementation is based on a byte-code interpreter and a onespace compacting collector, and runs on a Macintosh. Introduction The Amber machine is a stack machine designed as an intermediate language for compiling higher-order languages, in the tradition of SECD machines [Landin 64] and combinator machines [Turner 79] [Curien 86]. This is a revision of the Functional Abstract Machine described in [Cardelli 83, Cardelli 84], and is specialized for the Amber language [Cardelli 86]. The amount of specialization required for a particular language in the general class of higher-order algorithmic languages is marginal; it mostly involves the set of primitive data types and does not affect the basic organization of the machine. The machine supports a set of basic data types, functional closures, signals, persistent objects and meta-level execution. The latter is needed as the Amber compiler is entirely written in Amber (above the Amber machine level) and needs to switch level when executing a program it has just compiled. A set of implementation strategies are admissible for this machine, including byte-code interpretation, threaded code interpretation and compilation to native code. The current implementation is based on a byte-code interpreter and a onespace compacting collector, while the similar Functional Abstract Machine for the 1Current addresss: DEC SRC, 130 Lytton Ave, Palo Alto, CA 94301.
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