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thunk 音標拼音: [θ'ʌnk] 替換程序 替換程式 thunk n 1: a dull hollow sound; "the basketball made a thunk as it hit the rim" address", according to P. Z. Ingerman, who invented thunks in 1961 as a way of binding {actual parameters} to their formal definitions in {ALGOL 60} {procedure} calls. If a procedure is called with an expression in the place of a {formal parameter}, the compiler generates a thunk which computes the expression and leaves the address of the result in some standard location. 2. The term was later generalised to mean an expression, frozen together with its {environment} (variable values), for later evaluation if and when needed (similar to a "{closure}"). The process of unfreezing these thunks is called "forcing". 3. A {stubroutine}, in an {overlay} programming environment, that loads and jumps to the correct overlay. Compare {trampoline}. There are a couple of onomatopoeic myths circulating about the origin of this term. The most common is that it is the sound made by data hitting the {stack}; another holds that the sound is that of the data hitting an {accumulator}. Yet another suggests that it is the sound of the expression being unfrozen at argument-evaluation time. In fact, according to the inventors, it was coined after they realised (in the wee hours after hours of discussion) that the type of an argument in {ALGOL 60} could be figured out in advance with a little {compile-time} thought, simplifying the evaluation machinery. In other words, it had "already been thought of"; thus it was christened a "thunk", which is "the past tense of "think" at two in the morning". 4. ({Microsoft Windows} programming) {universal thunk}, {generic thunk}, {flat thunk}. [{Jargon File}] (1997-10-11) thunk: /thuhnk/, n. 1. [obs.]“A piece of coding which provides an
address:”, according to P. Z. Ingerman, who invented thunks in 1961 as a way of binding actual parameters to their formal definitions in Algol-60 procedure calls. If a procedure is called with an expression in the place of a formal parameter, the compiler generates a thunk which computes the expression and leaves the address of the result in some standard location. |
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