rustc: split FnAbi's into definitions/direct calls ("of_instance") and indirect calls ("of_fn_ptr"). #65947

eddyb · 2019-10-29T20:36:21Z

After this PR:

InstanceDef::Virtual is only used for "direct" virtual calls, and shims around those calls use InstanceDef::ReifyShim (i.e. for <dyn Trait as Trait>::f as fn(_))
- this could easily be done for intrinsics as well, to allow their reification, but I didn't do it
FnAbi::of_instance is always used for declaring/defining an fn, and for direct calls to an fn
- this is great for e.g. Implement #[track_caller] attribute. (RFC 2091 4/N) #65881 (#[track_caller]), which can introduce the "caller location" argument into "codegen signatures" by only changing FnAbi::of_instance, after this PR
FnAbi::of_fn_ptr is used primarily for indirect calls, i.e. to fn pointers
- not virtual calls (which use FnAbi::of_instance with InstanceDef::Virtual)
- there's also a couple uses where the rustc_codegen_llvm needs to declare (i.e. FFI-import) an LLVM function that has no Rust declaration available at all
  - at least one of them could probably be a "weak lang item" instead

As there are many steps, this PR is best reviewed commit by commit - some of which arguably should be in their own PRs, I may have gotten carried away a bit.

cc @nagisa @rkruppe @oli-obk @anp

rust-highfive · 2019-10-29T20:36:26Z

r? @varkor

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eddyb · 2019-10-30T10:29:48Z

@bors try @rust-timer queue

rust-timer · 2019-10-30T10:29:50Z

Awaiting bors try build completion

bors · 2019-10-30T10:29:59Z

⌛ Trying commit a3153cb25e0c2eca2a987433763f40383a774cf8 with merge 924ec06b909e3054669b8cec62e173ff2e962a06...

src/librustc/ty/layout.rs

bors · 2019-10-30T13:36:08Z

☀️ Try build successful - checks-azure
Build commit: 924ec06b909e3054669b8cec62e173ff2e962a06 (924ec06b909e3054669b8cec62e173ff2e962a06)

rust-timer · 2019-10-30T13:36:11Z

Queued 924ec06b909e3054669b8cec62e173ff2e962a06 with parent 0b7e28a, future comparison URL.

src/librustc_codegen_llvm/callee.rs

rust-timer · 2019-10-30T19:00:51Z

Finished benchmarking try commit 924ec06b909e3054669b8cec62e173ff2e962a06, comparison URL.

varkor · 2019-11-08T16:00:20Z

I've looked through, and while the changes look sensible to me, I'm not familiar enough to be sure I haven't missed some detail, so I'm going to reassign. r? @nagisa

varkor · 2019-11-08T16:02:19Z

this could easily be done for intrinsics as well, to allow their reification, but I didn't do it

Does this mean #15694 could be addressed?

eddyb · 2019-11-08T17:26:50Z

Does this mean #15694 could be addressed?

@varkor Yeah, and it's been possible ever since MIR shims were added, really.
I'm just making the diff for that be a couple less lines from a dozen, or thereabouts.

nagisa

Overall LGTM.

r=me once you’re comfortable with landing this.

src/librustc/ty/instance.rs

src/librustc_codegen_llvm/callee.rs

src/librustc_codegen_llvm/intrinsic.rs

eddyb · 2019-11-27T12:18:25Z

@nagisa @oli-obk I've added 6 more commits, which should deal with both the review comments and my own concerns (mostly wrt the misusability of Instance::fn_sig).

…FnAbi.

…rtual.

eddyb · 2019-12-03T14:41:20Z

@bors r=oli-obk,nagisa

bors · 2019-12-03T14:41:22Z

📌 Commit c2f4c57 has been approved by oli-obk,nagisa

bors · 2019-12-04T08:22:12Z

⌛ Testing commit c2f4c57 with merge 5f1d6c4...

@nagisa

rustc: split FnAbi's into definitions/direct calls ("of_instance") and indirect calls ("of_fn_ptr"). After this PR: * `InstanceDef::Virtual` is only used for "direct" virtual calls, and shims around those calls use `InstanceDef::ReifyShim` (i.e. for `<dyn Trait as Trait>::f as fn(_)`) * this could easily be done for intrinsics as well, to allow their reification, but I didn't do it * `FnAbi::of_instance` is **always** used for declaring/defining an `fn`, and for direct calls to an `fn` * this is great for e.g. #65881 (`#[track_caller]`), which can introduce the "caller location" argument into "codegen signatures" by only changing `FnAbi::of_instance`, after this PR * `FnAbi::of_fn_ptr` is used primarily for indirect calls, i.e. to `fn` pointers * *not* virtual calls (which use `FnAbi::of_instance` with `InstanceDef::Virtual`) * there's also a couple uses where the `rustc_codegen_llvm` needs to declare (i.e. FFI-import) an LLVM function that has no Rust declaration available at all * at least one of them could probably be a "weak lang item" instead As there are many steps, this PR is best reviewed commit by commit - some of which arguably should be in their own PRs, I may have gotten carried away a bit. cc @nagisa @rkruppe @oli-obk @anp

bors · 2019-12-04T11:22:19Z

☀️ Test successful - checks-azure
Approved by: oli-obk,nagisa
Pushing 5f1d6c4 to master...

@eddyb

Cleanup BodyCache After this PR: - `BodyCache` is renamed to `BodyAndCache` - `ReadOnlyBodyCache` is renamed to `ReadOnlyBodyAndCache` - `ReadOnlyBodyAndCache::body` fn is removed and all calls to it are replaced by a deref (possible due to fix of its `Deref` imp in rust-lang#65947) cc @eddyb @oli-obk

@eddyb

Cleanup BodyCache After this PR: - `BodyCache` is renamed to `BodyAndCache` - `ReadOnlyBodyCache` is renamed to `ReadOnlyBodyAndCache` - `ReadOnlyBodyAndCache::body` fn is removed and all calls to it are replaced by a deref (possible due to fix of its `Deref` imp in rust-lang#65947) cc @eddyb @oli-obk

@eddyb

Cleanup BodyCache After this PR: - `BodyCache` is renamed to `BodyAndCache` - `ReadOnlyBodyCache` is renamed to `ReadOnlyBodyAndCache` - `ReadOnlyBodyAndCache::body` fn is removed and all calls to it are replaced by a deref (possible due to fix of its `Deref` imp in rust-lang#65947) cc @eddyb @oli-obk

rust-highfive assigned varkor Oct 29, 2019

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eddyb commented Oct 30, 2019

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eddyb mentioned this pull request Oct 31, 2019

FnAbi computation should be cached. #65999

Open

anp mentioned this pull request Nov 2, 2019

Implement #[track_caller] attribute. (RFC 2091 4/N) #65881

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eddyb force-pushed the fn-abi branch from a3153cb to 43c07dd Compare November 3, 2019 09:06

eddyb mentioned this pull request Nov 7, 2019

Implement arbitrary-self dynamic method receivers rust-lang/miri#1038

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nagisa reviewed Nov 19, 2019

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eddyb mentioned this pull request Nov 27, 2019

[WIP] rustc_mir: use FnAbi to get abi::call::Conv in miri. #66807

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eddyb force-pushed the fn-abi branch from 43c07dd to 0232114 Compare November 27, 2019 12:11

eddyb added 13 commits December 3, 2019 15:28

rustc_codegen_ssa: take a FnAbi instead of a FnSig in declare_fn.

95b9442

rustc_codegen_llvm: move NoReturn attribute to apply_attrs_llfn.

5b7d0f3

rustc_codegen_ssa: use FnAbi::of_instance wherever possible.

4b68afe

rustc: use ReifyShim for reifying Virtual call instances.

39e50e2

rustc: compute FnAbi's for virtual calls through FnAbi::of_instance.

052d0ed

rustc: rename FnAbi::new to FnAbi::of_fn_ptr.

2b921d5

rustc: take a PolyFnSig instead of an FnSig in FnAbi::of_fn_ptr.

902433b

rustc_codegen_llvm: rewrite debuginfo::get_function_signature to use …

8a8749b

…FnAbi.

rustc_codegen_llvm: take an Instance in attributes::from_fn_attrs.

cd3c324

rustc_codegen_llvm: privatize as much of attributes::* as possible.

e93aa10

rustc_target: add abi::call::Conv::Rust distinct from Conv::C.

79d908b

rustc: move Instance::fn_sig to ty::layout and privatize it.

9da14a8

rustc: add docs to FnAbi::{of_fn_ptr,of_instance} and InstanceDef::Vi…

c2f4c57

…rtual.

eddyb force-pushed the fn-abi branch from 0ef6219 to c2f4c57 Compare December 3, 2019 13:56

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 3, 2019

eddyb mentioned this pull request Dec 3, 2019

Cleanup BodyCache #66991

Merged

bors added the merged-by-bors This PR was explicitly merged by bors. label Dec 4, 2019

bors merged commit c2f4c57 into rust-lang:master Dec 4, 2019

This was referenced Dec 4, 2019

Reorganize borrow check diagnostic code #66815

Merged

Add a raw "address of" operator #64588

Merged

eddyb deleted the fn-abi branch December 4, 2019 11:29

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rustc: split FnAbi's into definitions/direct calls ("of_instance") and indirect calls ("of_fn_ptr"). #65947

rustc: split FnAbi's into definitions/direct calls ("of_instance") and indirect calls ("of_fn_ptr"). #65947

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rustc: split FnAbi's into definitions/direct calls ("of_instance") and indirect calls ("of_fn_ptr"). #65947

rustc: split FnAbi's into definitions/direct calls ("of_instance") and indirect calls ("of_fn_ptr"). #65947

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