mirror
/
rustc-dev-guide
mirror of https://github.com/rust-lang/rustc-dev-guide.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

reword HIR intro. Fix #116

This commit is contained in:
Mark Mansi 2018-05-08 12:40:43 -05:00 committed by Who? Me?!
parent 5544506249
commit ae516b0cc7
1 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
src/hir.md
View File

@ -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.