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Add DAG to glossary

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Philipp Hansch 2018-02-05 20:39:35 +01:00 committed by Who? Me?!
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@ -6,6 +6,7 @@ The compiler uses a number of...idiosyncratic abbreviations and things. This glo
Term | Meaning
------------------------|--------
AST | the abstract syntax tree produced by the syntax crate; reflects user syntax very closely.
DAG | a directed acyclic graph is used during compilation to index which queries execute which other queries. ([see more](incremental-compilation.html))
codegen unit | when we produce LLVM IR, we group the Rust code into a number of codegen units. Each of these units is processed by LLVM independently from one another, enabling parallelism. They are also the unit of incremental re-use.
cx | we tend to use "cx" as an abbrevation for context. See also `tcx`, `infcx`, etc.
DefId | an index identifying a definition (see `librustc/hir/def_id.rs`). Uniquely identifies a `DefPath`.