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Take substs into account in conservative_is_privately_uninhabited #62261

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Take substs into account in conservative_is_privately_uninhabited #62261

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varkor
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@varkor varkor commented Jun 30, 2019

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r? @oli-obk

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jun 30, 2019
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Centril commented Jul 1, 2019

Some before/after tests would be great :)

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varkor commented Jul 1, 2019

conservative_is_privately_uninhabited is mainly used for sanity checks that don't affect code output. I think it's only used functionally to determine the layout of an uninhabited array. Maybe it'd be possible to test the codegen of uninhabited arrays; I'll add one when I get the time. However, this is an optimisation improvement in an edge case rather than a correctness fix, so I don't think it's critical (that is, it could be left as an E-easy follow up).

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oli-obk commented Jul 1, 2019

I can't review this properly until the 18th

@Mark-Simulacrum Mark-Simulacrum added S-inactive and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 9, 2019
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oli-obk commented Jul 14, 2019 •
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So... I'm guessing that this changes the layout's Abi of [Struct<!>; 1] to uninhabited, where before it was inhabited? (for struct Struct<T>(T, i32);. I'm not sure how to write a test for that

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varkor commented Jul 14, 2019

I'm guessing that this changes the layout's Abi of [Struct<!>; 1] to uninhabited, where before it was inhabited?

Yes, that's right.

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varkor commented Jul 22, 2019

I think it's reasonable not to test this. It's deliberately conservative, and either behaviour would be acceptable.

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oli-obk commented Jul 23, 2019

@bors r+

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bors commented Jul 23, 2019

📌 Commit 962bf69 has been approved by oli-obk

@bors bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Jul 23, 2019
Centril added a commit to Centril/rust that referenced this pull request Jul 23, 2019
@Centril
Rollup merge of rust-lang#62261 - varkor:conservative_is_privately_un…
57d2b28 
…inhabited-subst, r=oli-obk

Take substs into account in `conservative_is_privately_uninhabited`
@Centril Centril mentioned this pull request Jul 23, 2019
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Centril added a commit to Centril/rust that referenced this pull request Jul 24, 2019
@Centril
Rollup merge of rust-lang#62261 - varkor:conservative_is_privately_un…
6afb4e8 
…inhabited-subst, r=oli-obk

Take substs into account in `conservative_is_privately_uninhabited`
@Centril Centril mentioned this pull request Jul 24, 2019
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bors added a commit that referenced this pull request Jul 24, 2019
@bors
Auto merge of #62923 - Centril:rollup-53i3am3, r=Centril
486833d 
Rollup of 11 pull requests

Successful merges:

 - #62261 (Take substs into account in `conservative_is_privately_uninhabited`)
 - #62528 (Add joining slices of slices with a slice separator, not just a single item)
 - #62738 (Remove uses of mem::uninitialized from std::sys::cloudabi)
 - #62784 (Add riscv32i-unknown-none-elf target)
 - #62808 (Revert "Disable stack probing for gnux32.")
 - #62814 (add support for hexagon-unknown-linux-musl)
 - #62822 (Improve some pointer-related documentation)
 - #62890 (Normalize use of backticks in compiler messages for libsyntax/*)
 - #62901 (cleanup: Remove `extern crate serialize as rustc_serialize`s)
 - #62905 (Normalize use of backticks in compiler messages for doc)
 - #62908 (normalize use of backticks for compiler messages in remaining modules)

Failed merges:

r? @ghost
Centril added a commit to Centril/rust that referenced this pull request Jul 24, 2019
@Centril
Rollup merge of rust-lang#62261 - varkor:conservative_is_privately_un…
cf1e51b 
…inhabited-subst, r=oli-obk

Take substs into account in `conservative_is_privately_uninhabited`
@Centril Centril mentioned this pull request Jul 24, 2019
Closed
Centril added a commit to Centril/rust that referenced this pull request Jul 24, 2019
@Centril
Rollup merge of rust-lang#62936 - Centril:rollup-d702q3x, r=Centril
8f5f607 
Rollup of 10 pull requests

Successful merges:

 - rust-lang#60938 (rustdoc: make #[doc(include)] relative to the containing file)
 - rust-lang#61890 (Fix some sanity checks)
 - rust-lang#62261 (Take substs into account in `conservative_is_privately_uninhabited`)
 - rust-lang#62528 (Add joining slices of slices with a slice separator, not just a single item)
 - rust-lang#62735 (Turn `#[global_allocator]` into a regular attribute macro)
 - rust-lang#62801 (Remove support for -Zlower-128bit-ops)
 - rust-lang#62808 (Revert "Disable stack probing for gnux32.")
 - rust-lang#62819 (Display name of crate requiring rustc_private in error messages.)
 - rust-lang#62904 (Disable d32 on armv6 hf targets)
 - rust-lang#62907 (Initialize the MSP430 AsmParser)

Failed merges:

r? @ghost
Centril added a commit to Centril/rust that referenced this pull request Jul 24, 2019
@Centril
Rollup merge of rust-lang#62261 - varkor:conservative_is_privately_un…
c82c77d 
…inhabited-subst, r=oli-obk

Take substs into account in `conservative_is_privately_uninhabited`
@Centril Centril mentioned this pull request Jul 24, 2019
Closed
Centril added a commit to Centril/rust that referenced this pull request Jul 24, 2019
@Centril
Rollup merge of rust-lang#62960 - Centril:rollup-8jay7g7, r=Centril
ab09144 
Rollup of 13 pull requests

Successful merges:

 - rust-lang#60938 (rustdoc: make #[doc(include)] relative to the containing file)
 - rust-lang#61890 (Fix some sanity checks)
 - rust-lang#62084 (allow clippy::unreadable_literal in unicode tables)
 - rust-lang#62261 (Take substs into account in `conservative_is_privately_uninhabited`)
 - rust-lang#62528 (Add joining slices of slices with a slice separator, not just a single item)
 - rust-lang#62735 (Turn `#[global_allocator]` into a regular attribute macro)
 - rust-lang#62801 (Remove support for -Zlower-128bit-ops)
 - rust-lang#62808 (Revert "Disable stack probing for gnux32.")
 - rust-lang#62822 (Improve some pointer-related documentation)
 - rust-lang#62904 (Disable d32 on armv6 hf targets)
 - rust-lang#62907 (Initialize the MSP430 AsmParser)
 - rust-lang#62921 (Add method disambiguation help for trait implementation)
 - rust-lang#62942 (Use match ergonomics in Condvar documentation)

Failed merges:

r? @ghost
Centril added a commit to Centril/rust that referenced this pull request Jul 25, 2019
@Centril
Rollup merge of rust-lang#62261 - varkor:conservative_is_privately_un…
44bbc38 
…inhabited-subst, r=oli-obk

Take substs into account in `conservative_is_privately_uninhabited`
@Centril Centril mentioned this pull request Jul 25, 2019
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Centril commented Jul 25, 2019

@bors r-

Caused a legit timeout in many a rollup... :) 😭

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jul 25, 2019
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Centril commented Jul 25, 2019

@bors rollup=never

@JohnCSimon
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@Centril @varkor Hello from triage. Any progress on this? Thanks.

@totsteps
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totsteps commented Aug 13, 2019 •
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Second ping from triage, @varkor any updates on this? Some checks weren't successful!!

Note: Thanks for the PR. This will be closed and marked as S-inactive-closed next week. Feel free to re-open when you have time.

Thanks

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varkor commented Aug 13, 2019

I don't have time to investigate this now, and it's low priority, so I'll close for now.

@varkor varkor closed this Aug 13, 2019
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@rustbot modify labels to -S-inactive +S-inactive-closed

@rustbot rustbot added S-inactive Status: Inactive and waiting on the author. This is often applied to closed PRs. and removed S-inactive labels Mar 29, 2020
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