Forward more ExactSizeIterator methods and `is_empty` edits
- Forward ExactSizeIterator methods in more places, like `&mut I` and `Box<I>` iterator impls.
- Improve `VecDeque::is_empty` itself (see commit 4)
- All the collections iterators now have `len` or `is_empty` forwarded if doing so is a benefit. In the remaining cases, they already use a simple size hint (using something like a stored `usize` value), which is sufficient for the default implementation of len and is_empty.
Remove redundant assertion near is_char_boundary
Follow-up from #38056. `is_char_boundary` already checks for `idx <= len`, so, an extra assertion is redundant.
Remove Self: Sized from Iterator::nth
It is an unnecessary restriction; nth neither needs self to be sized
nor needs to be exempted from the trait object.
It increases the utility of the nth method, because type specific
implementations are available through `&mut I` or through an iterator
trait object.
It is a backwards compatible change due to the special cases of the
`where Self: Sized` bound; it was already optional to include this bound
in `Iterator` implementations.
Smarter HashMap/HashSet pre-allocation for extend/from_iter
HashMap/HashSet from_iter and extend are making totally different assumptions.
A more balanced decision may allocate half the lower hint (rounding up). For "well defined" iterators this effectively limits the worst case to two resizes (the initial reserve + one resize).
cc #36579
cc @bluss
Simplify calling find_implied_output_region.
@nnethercote added the optimization that find_implied_output_region
takes a closure as an optimization in #37014, but passing an iterator is
simpler, and more ergonomic for callers.
Don't apply msvc link opts for non-opt build
`/OPT:REF,ICF` sometimes takes lots of time. It makes no sense to apply them when doing debug build. MSVC's linker by default disables these optimizations when `/DEBUG` is specified, unless they are explicitly passed.
@nnethercote added the optimization that find_implied_output_region
takes a closure as an optimization in #37014, but passing an iterator is
simpler, and more ergonomic for callers.
Refactor ty::FnSig to contain a &'tcx Slice<Ty<'tcx>>
We refactor this in order to achieve the following wins:
- Decrease the size of `FnSig` (`Vec` + `bool`: 32, `&Slice` + `bool`: 24).
- Potentially decrease total allocated memory due to arena-allocating `FnSig` inputs/output; since they are allocated in the type list arena, other users of type lists can reuse the same allocation for an equivalent type list.
- Remove the last part of the type system which needs drop glue (#37965 removed the other remaining part). This makes arenas containing `FnSig` faster to drop (since we don't need to drop a Vec for each one), and makes reusing them without clearing/dropping potentially possible.
r? @eddyb
configure: only req CMake if we're building LLVM
CMake is only necessary if LLVM is going to be built and not in any
other case.
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Point arg num mismatch errors back to their definition
This PR updates the arg num errors (like E0061) to point back at the function definition where they were defined.
Before:
```
error[E0061]: this function takes 2 parameters but 1 parameter was supplied
--> E0061.rs:18:7
|
18 | f(0);
| ^
|
= note: the following parameter types were expected:
= note: u16, &str
```
Now:
```
error[E0061]: this function takes 2 parameters but 1 parameter was supplied
--> E0061.rs:18:7
|
11 | fn f(a: u16, b: &str) {}
| ------------------------ defined here
...
18 | f(0);
| ^ expected 2 parameters
```
This is an incremental improvement. We probably want to underline only the function name and also have support for functions defined in crates outside of the current crate.
r? @nikomatsakis
don't rebuild alloc_jemalloc if jemalloc's .git directory has changed
the .git directory is modified by `bootstrap` when it updates this git
submodule; this triggered rebuilds every time `bootstrap` was called.
likely fixes#38094
r? @alexcrichton
Add std::os::windows::process::CommandExt. Fixes#37827
This adds a CommandExt trait for Windows along with an implementation of it
for std::process::Command with methods to set the process creation flags that
are passed to CreateProcess.
fix stack overflow by enum and cont issue #36163
some paths were skipped while checking for recursion.
I fixed bug reproduces on win64 cargo test. In previous PR #36458 time complexity was exponential in case of linked const values. Now it's linear.
r? @alexcrichton
Adds `-Z mir-stats`, which is similar to `-Z hir-stats`.
Adds `-Z mir-stats`, which is similar to `-Z hir-stats`.
Some notes:
* This code attempts to present the breakdown of each variant for
every enum in the MIR. This is meant to guide decisions about how to
revise representations e.g. when to box payloads for rare variants
to shrink the size of the enum overall.
* I left out the "Total:" line that hir-stats presents, because this
implementation uses the MIR Visitor infrastructure, and the memory
usage of structures directly embedded in other structures (e.g. the
`func: Operand` in a `TerminatorKind:Call`) is not distinguished
from similar structures allocated in a `Vec` (e.g. the `args:
Vec<Operand>` in a `TerminatorKind::Call`). This means that a naive
summation of all the accumulated sizes is misleading, because it
will double-count the contribution of the `Operand` of the `func` as
well as the size of the whole `TerminatorKind`.
* I did consider abandoning the MIR Visitor and instead hand-coding
a traversal that distinguished embedded storage from indirect
storage. But such code would be fragile; better to just require
people to take care when interpreting the presented results.
* This traverses the `mir.promoted` rvalues to capture stats for MIR
stored there, even though the MIR visitor super_mir method does not
do so. (I did not observe any promoted mir being newly traversed when
compiling the rustc crate, however.)
* It might be nice to try to unify this code with hir-stats. Then
again, the reporting portion is the only common code (I think), and
it is small compared to the visitors in hir-stats and mir-stats.
Add i686-unknown-openbsd target.
It is a preliminary work. I still have some tests failing, but I have a working rustc binary which is able to rebuild itself.
an update of libc should be required too, but I dunno how to do it with vendor/ layout.
r? @alexcrichton
Improve is_empty on the VecDeque and its iterators by just comparing
tail and head; this saves a few instructions (to be able to remove the
`& (size - 1)` computation, it would have to know that size is a power of two).
in region, treat current (and future) item-likes alike
The `visit_fn` code mutates its surrounding context. Between *items*,
this was saved/restored, but between impl items it was not. This meant
that we wound up with `CallSiteScope` entries with two parents (or
more!). As far as I can tell, this is harmless in actual type-checking,
since the regions you interact with are always from at most one of those
branches. But it can slow things down.
Before, the effect was limited, since it only applied to impl items
within an impl. After #37660, impl items are visisted all together at
the end, and hence this could create a very messed up
hierarchy. Isolating impl item properly solves both issues.
I cannot come up with a way to unit-test this; for posterity, however,
you can observe the messed up hierarchies with a test as simple as the
following, which would create a callsite scope with two parents both
before and after
```
struct Foo {
}
impl Foo {
fn bar(&self) -> usize {
22
}
fn baz(&self) -> usize {
22
}
}
fn main() { }
```
Fixes#37864.
r? @michaelwoerister
cc @pnkfelix -- can you think of a way to make a regr test?
add a `-Z incremental-dump-hash` flag
This causes us to dump a bunch of has information to stdout that can be
useful in tracking down incremental compilation invalidations,
particularly across crates.
