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138 lines
3.4 KiB
HTML
138 lines
3.4 KiB
HTML
<html>
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<head>
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<title>
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Glossary Of Terms Used In Mercury
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</title>
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</head>
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<body
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bgcolor="#ffffff"
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text="#000000"
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>
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<hr>
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<!-------------------------->
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<dl>
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<dt> assertion
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<dd>
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A particular form of promise which claims to the compiler
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that the specified goal will always hold. If useful, the
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compiler may use this information to perform optimisations.
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<dt> class context
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<dd>
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The typeclass constraints on a predicate or function.
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<dt> codeinfo
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<dd>
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a structure used by codegen.m
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<dt> HLDS
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<dd>
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The "High Level Data Structure". See hlds.m.
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<dt> inst
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<dd>
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instantiatedness. An inst holds three different sorts of
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information. It indicates whether a variable is free, partially
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bound, or ground. If a variable is bound, it may indicate
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which functor(s) the variable can be bound to. Also,
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an inst records whether a value is unique, or whether
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it may be aliased.
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<dt> liveness
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<dd>
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this term is used to mean two quite different things!
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<ol>
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<li> There's a notion of liveness used in mode analysis:
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a variable is live if either it or an alias might be
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used later on in the computation.
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<li> There's a different notion of liveness used for code generation:
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a variable becomes live (is "born") when the register or stack
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slot holding the variable first acquires a value, and dies when
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that value will definitely not be needed again within this procedure.
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This notion is low-level because it could depend on the low-level
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representation details (in particular, `no_tag' representations
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ought to affect liveness).
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</ol>
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<dt> LLDS
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<dd>
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The "Low Level Data Structure". See llds.m.
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<dt> mode
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<dd>
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this has two meanings:
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<ol>
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<li> a mapping from one instantiatedness to another
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(the mode of a single variable)
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<li> a mapping from an initial instantiatedness of a predicate's
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arguments to their final instantiatedness
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(the mode of a predicate)
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</ol>
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<dt> moduleinfo
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<dd>
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Another name for the HLDS.
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<dt> NYI
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<dd>
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Not Yet Implemented.
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<dt> predinfo
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<dd>
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the structure in HLDS which contains information about
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a predicate.
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<dt> proc (procedure)
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<dd>
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a particular mode of a predicate.
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<dt> procinfo
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<dd>
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the structure in HLDS which contains
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information about a procedure.
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<dt> promise
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<dd>
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A declaration that specifies a law that holds for the
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predicates/functions in the declaration. Thus, examples of promises
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are assertions and promise ex declarations. More generally, the term
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promise is often used for a declaration where extra information is
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given to the compiler which it cannot check itself, for example in
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purity pragmas.
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<dt> promise ex
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<dd>
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A shorthand for promise_exclusive, promise_exhaustive, and
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promise_exclusive_exhaustive declarations. These declarations
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are used to tell the compiler determinism properties of a
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disjunction.
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<dt> RTTI
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<dd>
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The "RunTime Type Information". See rtti.m. A copy of a paper given
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on this topic is available
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<a href="http://www.mercurylang.org/documentation/papers/rtti_ppdp.ps.gz">here</a> in zipped Postscript format.
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<dt> super-homogenous form (SHF)
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<dd>
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a simplified, flattened form of goals, where
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each unification is split into its component pieces; in particular,
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the arguments of each predicate call and functor must be distinct
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variables.
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<dt> switch
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<dd>
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a disjunction which does a case analysis on the toplevel
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functor of some variable.
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</dl>
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<hr>
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<!-------------------------->
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</body>
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</html>
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