Add simpler entry points to const eval for common usages. by BenLewis-Seequent · Pull Request #66877 · rust-lang/rust

BenLewis-Seequent · 2019-11-29T20:15:26Z

I found the tcx.const_eval API to be complex/awkward to work with, because of the inherent complexity from all of the different situations it is called from. Though it mainly used in one of the following ways:

Evaluates the value of a constant without any substitutions, e.g. evaluating a static, discriminant, etc.
Evaluates the value of a resolved instance of a constant. this happens when evaluating unevaluated constants or normalising trait constants.
Evaluates a promoted constant.

This PR adds three new functions const_eval_mono, const_eval_resolve, and const_eval_promoted to TyCtxt, which each cater to one of the three ways tcx.const_eval
is normally used.

matthewjasper · 2019-11-29T20:17:48Z

r? @oli-obk
cc @eddyb

src/librustc/mir/interpret/mod.rs

rust-highfive · 2019-11-29T20:33:34Z

The job x86_64-gnu-llvm-6.0 of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

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2019-11-29T20:16:09.2724085Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-11-29T20:16:09.2887227Z ##[command]git config gc.auto 0
2019-11-29T20:16:09.2952066Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-11-29T20:16:10.1083580Z ##[command]git config --get-all http.proxy
2019-11-29T20:16:10.1094395Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/66877/merge:refs/remotes/pull/66877/merge
---
2019-11-29T20:21:45.1084103Z    Compiling serde_json v1.0.40
2019-11-29T20:21:46.6978396Z    Compiling tidy v0.1.0 (/checkout/src/tools/tidy)
2019-11-29T20:21:56.9171684Z     Finished release [optimized] target(s) in 1m 21s
2019-11-29T20:21:56.9262880Z tidy check
2019-11-29T20:21:57.7391025Z tidy error: /checkout/src/librustc/mir/interpret/mod.rs:611: line longer than 100 chars
2019-11-29T20:21:57.7391459Z tidy error: /checkout/src/librustc/mir/interpret/mod.rs: missing trailing newline
2019-11-29T20:21:59.5172759Z some tidy checks failed
2019-11-29T20:21:59.5178863Z Found 486 error codes
2019-11-29T20:21:59.5178934Z Found 0 error codes with no tests
2019-11-29T20:21:59.5178981Z Done!
2019-11-29T20:21:59.5178981Z Done!
2019-11-29T20:21:59.5184647Z 
2019-11-29T20:21:59.5184980Z 
2019-11-29T20:21:59.5185828Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout/src" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "--no-vendor"
2019-11-29T20:21:59.5186183Z 
2019-11-29T20:21:59.5186280Z 
2019-11-29T20:21:59.5186567Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
2019-11-29T20:21:59.5186999Z Build completed unsuccessfully in 0:01:24
2019-11-29T20:21:59.5186999Z Build completed unsuccessfully in 0:01:24
2019-11-29T20:21:59.5242662Z == clock drift check ==
2019-11-29T20:21:59.5263961Z   local time: Fri Nov 29 20:21:59 UTC 2019
2019-11-29T20:21:59.8129915Z   network time: Fri, 29 Nov 2019 20:21:59 GMT
2019-11-29T20:21:59.8132404Z == end clock drift check ==
2019-11-29T20:22:01.1054298Z 
2019-11-29T20:22:01.1152256Z ##[error]Bash exited with code '1'.
2019-11-29T20:22:01.1178757Z ##[section]Starting: Checkout
2019-11-29T20:22:01.1180412Z ==============================================================================
2019-11-29T20:22:01.1180667Z Task         : Get sources
2019-11-29T20:22:01.1180723Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

src/librustc/mir/interpret/mod.rs

RalfJung · 2019-11-29T22:07:59Z

src/librustc/mir/interpret/mod.rs

Why are these added in this file, as opposed to next to const_eval or so?

Scrolling over this file, the only coherent description of it that I can come up with is "random stuff".^^

They need to be within librustc as they are used inside it. I'm not sure where the best place is.

maybe just put them into a submodule of this module. queries could work as a name.

oli-obk

Maybe rename the query to const_eval_global_id (or if it is unused except forin the three wrappers, name it const_eval_internal and leave a comment on it suggesting the use of the wrappers).

I worry that otherwise we'll just reintroduce calls to it that manually do all the boilerplate

src/librustc/mir/interpret/mod.rs

BenLewis-Seequent · 2019-11-30T21:49:59Z

I introduced another wrapper const_eval_instance so I could rename the query to const_eval_internal, which is only used by these wrappers and also inside const_eval_internal itself. Although I'm not sure that const_eval_instance is even needed as the only uses of it is for the type_name intrinsic, which could use const_eval_resolve, but we already have the instance.

RalfJung · 2019-12-01T21:31:38Z

So we have const_eval_raw and const_eval_internal? That seems potentially confusing. Please make sure that at least both some with extensive doc comments explaining their difference.

joelpalmer · 2019-12-09T13:27:10Z

Ping from Triage: Hi @Skinny121 - any updates?

BenLewis-Seequent · 2019-12-11T07:40:44Z

@RalfJung I have added to the doc comments explaining the difference between both of these queries.

bors · 2019-12-11T08:41:47Z

☔ The latest upstream changes (presumably #67202) made this pull request unmergeable. Please resolve the merge conflicts.

src/librustc/query/mod.rs

BenLewis-Seequent · 2019-12-20T07:40:52Z

@RalfJung @oli-obk Is there anything more I need to change?

src/librustc_mir/hair/cx/expr.rs

oli-obk · 2019-12-22T12:32:25Z

@bors r+

bors · 2019-12-22T12:32:26Z

📌 Commit c010d84 has been approved by oli-obk

bors · 2019-12-22T12:32:27Z

🌲 The tree is currently closed for pull requests below priority 100, this pull request will be tested once the tree is reopened

…r=oli-obk Add simpler entry points to const eval for common usages. I found the `tcx.const_eval` API to be complex/awkward to work with, because of the inherent complexity from all of the different situations it is called from. Though it mainly used in one of the following ways: - Evaluates the value of a constant without any substitutions, e.g. evaluating a static, discriminant, etc. - Evaluates the value of a resolved instance of a constant. this happens when evaluating unevaluated constants or normalising trait constants. - Evaluates a promoted constant. This PR adds three new functions `const_eval_mono`, `const_eval_resolve`, and `const_eval_promoted` to `TyCtxt`, which each cater to one of the three ways `tcx.const_eval` is normally used.

@ghost

Rollup of 8 pull requests Successful merges: - #66877 (Add simpler entry points to const eval for common usages.) - #67299 (Add `ImmTy::try_from_(u)int` methods) - #67487 (Rustdoc mutability removal) - #67499 (Misc MIR building cleanups) - #67506 (Remove iter_private.rs) - #67508 (Fix typo in path parser name) - #67519 (Document why Any is not an unsafe trait) - #67525 (Utilize rust-lang/rust commit hashes in toolstate) Failed merges: r? @ghost

Rustup to rust-lang/rust#66877 changelog: none

rust-highfive assigned matthewjasper Nov 29, 2019

rust-highfive assigned oli-obk and unassigned matthewjasper Nov 29, 2019

Centril reviewed Nov 29, 2019

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eddyb reviewed Nov 29, 2019

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BenLewis-Seequent mentioned this pull request Nov 30, 2019

rustc_typeck: gate AnonConst's generics on feature(const_generics). #66883

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BenLewis-Seequent force-pushed the const-eval-entry-points branch from 88af3a9 to 150f5a9 Compare December 1, 2019 03:21

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varkor added A-const-generics Area: const generics (parameters and arguments) F-const_generics `#![feature(const_generics)]` and removed A-const-generics Area: const generics (parameters and arguments) labels Dec 14, 2019

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Add simpler entry points to const eval for common usages.

c010d84

BenLewis-Seequent force-pushed the const-eval-entry-points branch from 8707e98 to c010d84 Compare December 21, 2019 22:16

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Dec 22, 2019

oli-obk mentioned this pull request Dec 22, 2019

Various const eval and pattern matching ICE fixes #67192

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Centril mentioned this pull request Dec 22, 2019

Rollup of 6 pull requests #67522

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Centril mentioned this pull request Dec 22, 2019

Rollup of 7 pull requests #67526

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Centril mentioned this pull request Dec 22, 2019

Rollup of 8 pull requests #67532

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bors merged commit c010d84 into rust-lang:master Dec 22, 2019

matthiaskrgr added a commit to matthiaskrgr/rust-clippy that referenced this pull request Dec 22, 2019

rustup rust-lang/rust#66877

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JohnTitor added a commit to JohnTitor/rust-clippy that referenced this pull request Dec 23, 2019

Rustup to rust-lang/rust#66877

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bors added a commit to rust-lang/rust-clippy that referenced this pull request Dec 23, 2019

Auto merge of #4944 - JohnTitor:rustup, r=oli-obk

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Rustup to rust-lang/rust#66877 changelog: none

varkor mentioned this pull request Jan 2, 2020

Tracking issue for const generics (RFC 2000) #44580

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