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Diffstat (limited to 'src/doc/rustc-dev-guide')
| -rw-r--r-- | src/doc/rustc-dev-guide/src/hir.md | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/src/doc/rustc-dev-guide/src/hir.md b/src/doc/rustc-dev-guide/src/hir.md index 3d2fbede3c4..51296e55e52 100644 --- a/src/doc/rustc-dev-guide/src/hir.md +++ b/src/doc/rustc-dev-guide/src/hir.md @@ -1,11 +1,12 @@ # The HIR -The HIR – "High-level IR" – is the primary IR used in most of rustc. -It is a desugared version of the "abstract syntax tree" (AST) that is generated -after parsing, macro expansion, and name resolution have completed. Many parts -of HIR resemble Rust surface syntax quite closely, with the exception that some -of Rust's expression forms have been desugared away (as an example, `for` loops -are converted into a `loop` and do not appear in the HIR). +The HIR – "High-level IR" – is the primary IR used in most of rustc. It is a +compiler-friendly representation of the abstract syntax tree (AST) that is +generated after parsing, macro expansion, and name resolution have completed. +Many parts of HIR resemble Rust surface syntax quite closely, with the +exception that some of Rust's expression forms have been desugared away. For +example, `for` loops are converted into a `loop` and do not appear in the HIR. +This makes HIR more amenable to analysis than a normal AST. This chapter covers the main concepts of the HIR. |