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Last edited by Takenobu Tani
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abbreviations

GHC Source Code Abbreviations

Certain abbreviations are used pervasively throughout the GHC source code. This page gives a partial list of them and their expansion:

  • ANF: A-normal form

  • BCO: Byte-code object

  • CAF: Constant Applicative Form

  • Class: Type Class

  • Cmm: The final IR used in GHC, based on the C-- language

  • Core: GHC core language. Based on System FC (variant of System F). Represents a type-checked and desugared program in some (out of several) intermediate compilation step

  • CoreFV: Free variables in core

  • CoreLint: Type and sanity-checking of core. (Lint: Jargon for a program analysis that looks for bug-suspicious code.)

  • CoreSubst: Substitution in core

  • CoreSyn: Core abstract syntax

  • DataCon: Data constructor

  • Ds: Desugarer

  • Gbl: Global

  • Hs: Haskell Syntax (generally as opposed to Core, for example, Expr vs HsExpr)

  • Hsc: Haskell compiler. Means it Deals with compiling a single module and no more.

  • HsSyn: Haskell abstract syntax

  • Id: Synonym for Var, but indicating a term variable

  • Iface: Interface, as in Haskell interface (.hi) files

  • IfaceSyn: Interface abstract syntax

  • LHs: Located Haskell something

  • Loc: Location, as in SrcLoc

  • Located: Something annotated with a SrcSpan

  • Lcl: Local

  • nativeGen: Native code generator (generates assembly from Cmm)

  • Occ: Occurrence

    • However, in the context of OccName, "occurrence" actually means "classified (i.e. as a type name, value name, etc) but not qualified and not yet resolved"

  • PId: Package ID

  • PprCore: Pretty-printing core

  • Rdr: Parser (or reader)

  • Rn: Rename or Renamer

  • Rts: Run Time System

  • SimplCore: Simplify core (the so-called simplifier belongs to this, as does the strictness analyser)

  • SrcLoc: Source location (filename, line number, character position)

  • SrcSpan: Source location span (filename, start line number and character position, end line number and character position)

  • STG: Spineless Tagless G-machine

  • Tc: TypeCheck{ing,er}

  • TSO: Thread State Object

  • TyCon: Type constructor

  • TyThing: Something that is type-checkable

  • Ty: Type

  • TyVar: Synonym for Var, but indicating a type variable

  • Var: A variable with some information about its type (or kind)