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some (very little) work on commenting

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Niko Matsakis
2012-06-05 16:01:14 -07:00
parent dd37c0a41e
commit ab8fa495d0
1 changed files with 8 additions and 0 deletions
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src/rustc/middle/borrowck/categorization.rs
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@@ -7,7 +7,15 @@ determine what kind of memory is used in evaluating it (for example,
where dereferences occur and what kind of pointer is dereferenced; where dereferences occur and what kind of pointer is dereferenced;
whether the memory is mutable; etc) whether the memory is mutable; etc)
Categorization effectively transforms all of our expressions into
expressions of the following forms (the actual enum has many more
possibilities, naturally, but they are all variants of these base
forms):
E = rvalue // some computed rvalue
| x // address of a local variable, arg, or upvar
| *E // deref of a ptr
| E.comp // access to an interior component
Imagine a routine ToAddr(Expr) that evaluates an expression and returns an Imagine a routine ToAddr(Expr) that evaluates an expression and returns an
address where the result is to be found. If Expr is an lvalue, then this address where the result is to be found. If Expr is an lvalue, then this