Store a new Region value every time we create a new region variable #44878

Nashenas88 · 2017-09-27T02:29:08Z

Paired with @spastorino to walk through this and implement #44870.

rust-highfive · 2017-09-27T02:29:21Z

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @pnkfelix (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

Nashenas88 · 2017-09-27T02:30:49Z

src/librustc_mir/transform/nll.rs

+}
+
+#[derive(Clone, Debug, Default, PartialEq, Eq)]


We couldn't keep the derive for Hash because of FxHashSet. It errors out saying that HashSet itself doesn't implement Hash.

Hopefully this will not have to be Hash.

Nashenas88 · 2017-09-27T02:31:55Z

src/librustc_mir/transform/nll.rs

@@ -29,15 +31,17 @@ impl<'a, 'gcx, 'tcx> NLLVisitor<'a, 'gcx, 'tcx> {
        NLLVisitor {
            infcx,
            lookup_map: HashMap::new(),
+            regions: vec![],
        }
    }

    pub fn into_results(self) -> HashMap<RegionVid, Lookup> {


Should we output this as a tuple, i.e. (HashMap<RegionVid, Lookup>, Vec<Region>)? Or do we only worry about that when we need to start using the output?

Nashenas88 · 2017-09-27T02:32:27Z

r? @nikomatsakis

Nashenas88 · 2017-09-27T02:34:13Z

Should we actually fork off of #44845 or will it be possible to merge this in without trouble?

arielb1 · 2017-09-27T09:22:27Z

src/librustc_mir/transform/nll.rs

 use syntax_pos::DUMMY_SP;
 use std::collections::HashMap;

 #[allow(dead_code)]
 struct NLLVisitor<'a, 'gcx: 'a + 'tcx, 'tcx: 'a> {
    lookup_map: HashMap<RegionVid, Lookup>,
+    regions: Vec<Region>,


Can you use a rustc_data_structures::indexed_vec::IndexVec here? usize indexes suck.

Changed to IndexVec in a6c107c

nikomatsakis

Looks good! One further suggestion.

nikomatsakis · 2017-09-27T19:49:57Z

src/librustc_mir/transform/nll.rs

+
+#[derive(Copy, Clone, Hash, Eq, PartialEq, Ord, PartialOrd, Debug)]
+pub struct RegionIndex(pub u32);


Hmm, it'd be nice if we could use the newtype_idx! macro for this. How about moving that macro into librustc_data_structures, so that everybody can use it?

To do that, you would move it into the indexed_vec module and put a #[macro_export] annotation on it, so that it gets exported across crates (I think that's the right annotation, anyway). Then we have to tag extern crate rustc_data_structures in src/librustc_mir/lib.rs with #[macro_use] also (and maybe in src/librustc/lib.rs).

@nikomatsakis perfect, yeah I was already doing that as a suggestion of @arielb1. There are also a lot of Idx types that implement new and index methods twice, so I was removing copies of that.

Anyway thanks for the instructions here, it will probably help me a lot :).

BTW: what do we do with RustcEncodable and RustcDecodable do we need to derive that?. If we really need I'd need to add an extern crate entry on the top level lib.rs because it's not included.

you can derive them -- you may need to add extern crate serialize as rustc_serialize; into the lib.rs if it's not already there

Done in bea4966 and e266c0f

BUT ... there are some things still pending and I have some questions:

I don't like that we need to add a lot of use clauses like in e266c0f#diff-5d719cdea9e30d4d425f7b673017e897R22 Not sure what's the common practice in Rust, but wouldn't be better if we use the full path to lookup names inside the macro so we can avoid use outside?

I was starting to make all the code use the macro but in cases like https://github.com/rust-lang/rust/blob/master/src/librustc/dep_graph/graph.rs#L583 we need index to be public and I can't use ::new because it's a constant. Unsure what would be better to do there.

Not sure what to use as debug_name in cases like e266c0f#diff-5d719cdea9e30d4d425f7b673017e897R160 and if I continue to migrate the rest of the code a lot of cases like that will shop up. I can just propose something and we can review later I guess.

OK so:

With respect to this gist, I don't quite understand why that gist makes the macro take a configurable max. That said, I also don't know why it's causing an ICE. =) Would take some investigation.

For this gist, what errors do you get? And what exactly did yo make pub?

Can you summarize the differences between those three gists?

I think we want the "short form"

Because this case https://gist.github.com/anonymous/341c6951962f1ca62da32fb4c99d51c3#file-first_statement-patch-L95 needs a different max. The correct macro should take an optional u32, if provided use that if not use u32::MAX.

I'm getting ...

error[E0449]: unnecessary visibility qualifier --> src/librustc/mir/mod.rs:1512:1 | 1512 | newtype_index!(Promoted, "promoted"); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `pub` not needed here

Because I'm making pub this https://gist.github.com/anonymous/369cc785baa07a54ca69e67b236878b2#file-crate_num-patch-L66 and https://gist.github.com/anonymous/369cc785baa07a54ca69e67b236878b2#file-crate_num-patch-L71
And if you don't make that pub you end getting a bunch of ...

error[E0599]: no function or associated item named `new` found for type `hir::def_id::CrateNum` in the current scope --> src/librustc/middle/dependency_format.rs:404:24 | 404 | let cnum = CrateNum::new(i + 1); | ^^^^^^^^^^^^^ |

is what we talked yesterday, we went with assert!(idx < ::std::u32::MAX as usize);.
Now that I force pushed links does not make sense anymore

Yep, we ended discussing yesterday in gitter. I pushed code with the short version.

OK, some further thoughts:

Ok. I have no problem with a configurable max, just wanted to understand. I think perhaps we should also make the macro more descriptive, but that's a separate thing. e.g something like:

newtype_index!(TypeName, { max: MAXIMUM, // <-- these lines are optional description: "TypeName", })

It'll take some macro fun to make it work =) but it'd be much prettier.

Regarding the pub qualifier: indeed you cannot declare things to be public in trait impls. Those errors you are getting are likely because the Idx trait is not imported into scope at the points where you are writing CrateNum::new. This is an ergonomic annoyance of using the trait method new instead of the older approach based on inherent methods. One way to do both would be to have the macro generate an inherent method as well. So something like:

impl $name { // <-- NB: NOT `impl Idx for $name` pub fn new(value: usize) -> Self { assert!(value < (::std::u32::MAX) as usize); $name(value as u32) } pub fn index(self) -> usize { self.0 as usize } } impl Idx for $name { fn new(value: usize) -> Self { Self::new(value) } fn index(self) -> usize { self.index() } }

The code at the very end might look surprising: what's happening there is that we are invoking the inherent methods from the trait methods. Though both have the same name, they are distinct to the compiler, and inherent methods get precedence.

sounds good. We would just need to figure out the ICE.

yep, I saw that this is the issue. Will check this and your suggestion is maybe better :).

New patch https://gist.github.com/spastorino/4c9c55df5f28293bc131b9bfb576c41e that gives another ICE ...

~/src/personal/rust git:(nashenas88) ✗ ./x.py build --stage 1 src/libstd Updating submodules extracting /Users/santiago/src/personal/rust/build/cache/2017-08-29/rust-std-beta-x86_64-apple-darwin.tar.gz extracting /Users/santiago/src/personal/rust/build/cache/2017-08-29/rustc-beta-x86_64-apple-darwin.tar.gz extracting /Users/santiago/src/personal/rust/build/cache/2017-08-29/cargo-beta-x86_64-apple-darwin.tar.gz Finished dev [unoptimized] target(s) in 0.0 secs Building stage0 std artifacts (x86_64-apple-darwin -> x86_64-apple-darwin) Compiling core v0.0.0 (file:///Users/santiago/src/personal/rust/src/libcore) Compiling unwind v0.0.0 (file:///Users/santiago/src/personal/rust/src/libunwind) Compiling cc v1.0.0 Compiling libc v0.2.31 Compiling filetime v0.1.12 Compiling build_helper v0.1.0 (file:///Users/santiago/src/personal/rust/src/build_helper) Compiling alloc_jemalloc v0.0.0 (file:///Users/santiago/src/personal/rust/src/liballoc_jemalloc) Compiling std v0.0.0 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v0.0.0 (file:///Users/santiago/src/personal/rust/src/libpanic_unwind) Finished release [optimized] target(s) in 60.49 secs Copying stage0 std from stage0 (x86_64-apple-darwin -> x86_64-apple-darwin / x86_64-apple-darwin) Building stage0 test artifacts (x86_64-apple-darwin -> x86_64-apple-darwin) Compiling getopts v0.2.15 Compiling term v0.0.0 (file:///Users/santiago/src/personal/rust/src/libterm) Compiling test v0.0.0 (file:///Users/santiago/src/personal/rust/src/libtest) Finished release [optimized] target(s) in 12.53 secs Copying stage0 test from stage0 (x86_64-apple-darwin -> x86_64-apple-darwin / x86_64-apple-darwin) Building stage0 compiler artifacts (x86_64-apple-darwin -> x86_64-apple-darwin) Compiling rustc_platform_intrinsics v0.0.0 (file:///Users/santiago/src/personal/rust/src/librustc_platform_intrinsics) Compiling rustc-demangle v0.1.5 Compiling cc v1.0.0 Compiling graphviz v0.0.0 (file:///Users/santiago/src/personal/rust/src/libgraphviz) Compiling syntax v0.0.0 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(file:///Users/santiago/src/personal/rust/src/librustc_passes) Compiling rustc_save_analysis v0.0.0 (file:///Users/santiago/src/personal/rust/src/librustc_save_analysis) Compiling rustc_privacy v0.0.0 (file:///Users/santiago/src/personal/rust/src/librustc_privacy) Compiling rustc_borrowck v0.0.0 (file:///Users/santiago/src/personal/rust/src/librustc_borrowck) Compiling rustc_plugin v0.0.0 (file:///Users/santiago/src/personal/rust/src/librustc_plugin) Compiling rustc-main v0.0.0 (file:///Users/santiago/src/personal/rust/src/rustc) Finished release [optimized] target(s) in 931.86 secs Copying stage0 rustc from stage0 (x86_64-apple-darwin -> x86_64-apple-darwin / x86_64-apple-darwin) Assembling stage1 compiler (x86_64-apple-darwin) Building stage1 std artifacts (x86_64-apple-darwin -> x86_64-apple-darwin) Compiling libc v0.2.31 Compiling core v0.0.0 (file:///Users/santiago/src/personal/rust/src/libcore) Compiling cc v1.0.0 Compiling unwind v0.0.0 (file:///Users/santiago/src/personal/rust/src/libunwind) Compiling filetime v0.1.12 Compiling build_helper v0.1.0 (file:///Users/santiago/src/personal/rust/src/build_helper) Compiling std v0.0.0 (file:///Users/santiago/src/personal/rust/src/libstd) Compiling cmake v0.1.26 Compiling compiler_builtins v0.0.0 (file:///Users/santiago/src/personal/rust/src/rustc/compiler_builtins_shim) Compiling alloc_jemalloc v0.0.0 (file:///Users/santiago/src/personal/rust/src/liballoc_jemalloc) Compiling rustc_tsan v0.0.0 (file:///Users/santiago/src/personal/rust/src/librustc_tsan) Compiling rustc_asan v0.0.0 (file:///Users/santiago/src/personal/rust/src/librustc_asan) Compiling std_unicode v0.0.0 (file:///Users/santiago/src/personal/rust/src/libstd_unicode) Compiling libc v0.0.0 (file:///Users/santiago/src/personal/rust/src/rustc/libc_shim) Compiling rand v0.0.0 (file:///Users/santiago/src/personal/rust/src/librand) error: internal compiler error: unexpected panic note: the compiler unexpectedly panicked. this is a bug. note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports note: rustc 1.22.0-dev running on x86_64-apple-darwin thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:335:20 note: Run with `RUST_BACKTRACE=1` for a backtrace. error: Could not compile `rand`. Caused by: process didn't exit successfully: `/Users/santiago/src/personal/rust/build/bootstrap/debug/rustc --crate-name rand src/librand/lib.rs --error-format json --crate-type lib --emit=dep-info,link -C opt-level=2 -C metadata=81b41dd92bfaa446 -C extra-filename=-81b41dd92bfaa446 --out-dir /Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps --target x86_64-apple-darwin -L dependency=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps -L dependency=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/release/deps --extern core=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps/libcore-8564d565e8172c07.rlib` (exit code: 101) warning: build failed, waiting for other jobs to finish... error: internal compiler error: unexpected panic note: the compiler unexpectedly panicked. this is a bug. note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports note: rustc 1.22.0-dev running on x86_64-apple-darwin thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:335:20 note: Run with `RUST_BACKTRACE=1` for a backtrace. error: Could not compile `compiler_builtins`. Caused by: process didn't exit successfully: `/Users/santiago/src/personal/rust/build/bootstrap/debug/rustc --crate-name compiler_builtins src/rustc/compiler_builtins_shim/../../libcompiler_builtins/src/lib.rs --error-format json --crate-type lib --emit=dep-info,link -C opt-level=2 --cfg feature="c" --cfg feature="compiler-builtins" --cfg feature="default" --cfg feature="rustbuild" -C metadata=abe9981e0d697dbc -C extra-filename=-abe9981e0d697dbc --out-dir /Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps --target x86_64-apple-darwin -L dependency=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps -L dependency=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/release/deps --extern core=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps/libcore-8564d565e8172c07.rlib -L native=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/build/compiler_builtins-0375618ff04bf6f3/out -l static=compiler-rt` (exit code: 101) warning: build failed, waiting for other jobs to finish... error: internal compiler error: unexpected panic note: the compiler unexpectedly panicked. this is a bug. note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports note: rustc 1.22.0-dev running on x86_64-apple-darwin thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:335:20 note: Run with `RUST_BACKTRACE=1` for a backtrace. error: internal compiler error: unexpected panic note: the compiler unexpectedly panicked. this is a bug. note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports note: rustc 1.22.0-dev running on x86_64-apple-darwin thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:335:20 note: Run with `RUST_BACKTRACE=1` for a backtrace. error: Could not compile `std_unicode`. Caused by: process didn't exit successfully: `/Users/santiago/src/personal/rust/build/bootstrap/debug/rustc --crate-name std_unicode src/libstd_unicode/lib.rs --error-format json --crate-type lib --emit=dep-info,link -C opt-level=2 -C metadata=07935fec0d990c43 -C extra-filename=-07935fec0d990c43 --out-dir /Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps --target x86_64-apple-darwin -L dependency=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps -L dependency=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/release/deps --extern core=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps/libcore-8564d565e8172c07.rlib` (exit code: 101) warning: build failed, waiting for other jobs to finish... error: Could not compile `libc`. Caused by: process didn't exit successfully: `/Users/santiago/src/personal/rust/build/bootstrap/debug/rustc --crate-name libc src/rustc/libc_shim/../../liblibc/src/lib.rs --error-format json --crate-type lib --emit=dep-info,link -C opt-level=2 --cfg feature="default" --cfg feature="stdbuild" -C metadata=193d229c9d522195 -C extra-filename=-193d229c9d522195 --out-dir /Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps --target x86_64-apple-darwin -L dependency=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps -L dependency=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/release/deps --extern core=/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage1-std/x86_64-apple-darwin/release/deps/libcore-8564d565e8172c07.rlib` (exit code: 101) thread 'main' panicked at 'command did not execute successfully: "/Users/santiago/src/personal/rust/build/x86_64-apple-darwin/stage0/bin/cargo" "build" "--target" "x86_64-apple-darwin" "-j" "4" "--release" "--features" "panic-unwind jemalloc backtrace" "--manifest-path" "/Users/santiago/src/personal/rust/src/libstd/Cargo.toml" "--message-format" "json" expected success, got: exit code: 101', src/bootstrap/compile.rs:883:8 note: Run with `RUST_BACKTRACE=1` for a backtrace. failed to run: /Users/santiago/src/personal/rust/build/bootstrap/debug/bootstrap build --stage 1 src/libstd Build completed unsuccessfully in 0:17:31

nikomatsakis · 2017-09-28T13:11:37Z

@bors r+

bors · 2017-09-28T13:11:38Z

📌 Commit e266c0f has been approved by nikomatsakis

nikomatsakis · 2017-09-28T14:43:44Z

@bors r- -- I missed @spastorino's comment here

bors · 2017-09-30T10:05:27Z

☔ The latest upstream changes (presumably #44893) made this pull request unmergeable. Please resolve the merge conflicts.

nikomatsakis · 2017-10-03T10:58:34Z

@spastorino @Nashenas88 needs rebase :(

nikomatsakis · 2017-10-03T21:44:56Z

@bors r+

bors · 2017-10-03T21:44:57Z

📌 Commit 024f13b has been approved by nikomatsakis

nikomatsakis · 2017-10-03T21:45:24Z

@bors r- -- err, I'm still not sure if we've resolved @spastorino's concerns. It seems to me that likely we can do that remaining work in a follow-up PR, though.

nikomatsakis

Reviewing this, I think it's good enough to land.

nikomatsakis · 2017-10-04T11:48:02Z

@bors r+

bors · 2017-10-04T11:48:03Z

📌 Commit 024f13b has been approved by nikomatsakis

bors · 2017-10-04T13:54:04Z

⌛ Testing commit 024f13b68f3782f26ae9f0e23dc1cc994e5af2d9 with merge 0a288f5a0f09bf7748edfcd68e1962788d8a7435...

bors · 2017-10-04T15:14:12Z

💔 Test failed - status-travis

bors · 2017-10-04T23:11:20Z

☔ The latest upstream changes (presumably #44901) made this pull request unmergeable. Please resolve the merge conflicts.

nikomatsakis · 2017-10-05T05:27:38Z

@bors r+

bors · 2017-10-05T05:27:39Z

📌 Commit 271a492 has been approved by nikomatsakis

bors · 2017-10-05T17:14:18Z

⌛ Testing commit 271a492 with merge 4531131...

@spastorino

Store a new Region value every time we create a new region variable Paired with @spastorino to walk through this and implement #44870.

bors · 2017-10-05T19:51:56Z

☀️ Test successful - status-appveyor, status-travis
Approved by: nikomatsakis
Pushing 4531131 to master...

@nikomatsakis

…akis Extend mir dump to dump each region Building on #44878, implement the feature discussed in #44872. Through discussions on the WG-nll-gitter, @nikomatsakis and I decided to implement this by extending `dump_mir` and all functions that it calls to take a callback of signature `FnMut(PassWhere, &mut Write) -> io::Result<()>` where `PassWhere` is an enum that represents possible locations that we may want to print out extra data in the process of dumping the MIR. I'm not particularly wedded to the name `PassWhere`, but I felt that simply calling the enum `Where` wasn't the right thing to name it. This work depends strongly on #44878, and should be rebased on the final version of that tree, whatever that may be.

rust-highfive assigned pnkfelix Sep 27, 2017

Nashenas88 commented Sep 27, 2017

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rust-highfive assigned nikomatsakis and unassigned pnkfelix Sep 27, 2017

arielb1 reviewed Sep 27, 2017

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nikomatsakis requested changes Sep 27, 2017

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aidanhs added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Sep 28, 2017

nikomatsakis mentioned this pull request Sep 28, 2017

prototype NLL inference infrastructure #44904

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spastorino force-pushed the master branch from a5f3874 to 224e87f Compare September 29, 2017 03:25

nikomatsakis approved these changes Oct 3, 2017

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chrisvittal mentioned this pull request Oct 3, 2017

Add variant to newtype_index! allowing a debug name Nashenas88/rust#1

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spastorino force-pushed the master branch from 224e87f to 024f13b Compare October 3, 2017 18:16

chrisvittal mentioned this pull request Oct 4, 2017

Extend mir dump to dump each region #45013

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nikomatsakis approved these changes Oct 4, 2017

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Nashenas88 and others added 9 commits October 4, 2017 23:50

Store a new Region value every time we create a new region variable

0c5de86

Convert regions to IndexVec

f5cef21

Move newtype_index to rustc_data_structures

3d230af

Generate Idx in nll using newtype_index!

c8549a1

Make newtype_index macro use full path to resolve constants

9af7426

Make newtype_index get debug_name using reflection

3502bec

Generate DepNodeIndexNew using newtype_index macro

b5a5556

Generate SerializedDepNodeIndex using newtype_index macro

8ee16f4

Generate ScopeId using newtype_index macro

271a492

spastorino force-pushed the master branch from 024f13b to 271a492 Compare October 5, 2017 03:21

bors added a commit that referenced this pull request Oct 5, 2017

Auto merge of #44878 - Nashenas88:master, r=nikomatsakis

4531131

Store a new Region value every time we create a new region variable Paired with @spastorino to walk through this and implement #44870.

bors merged commit 271a492 into rust-lang:master Oct 5, 2017


		#[derive(Copy, Clone, Hash, Eq, PartialEq, Ord, PartialOrd, Debug)]
		pub struct RegionIndex(pub u32);

Store a new Region value every time we create a new region variable #44878

Store a new Region value every time we create a new region variable #44878

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nikomatsakis commented Sep 28, 2017

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