Move monomorphize::resolve() to librustc #44896

qmx · 2017-09-28T03:28:45Z

this moves monomorphize::resolve(..) to librustc, and re-enables inlining for some trait methods, fixing #44389

@nikomatsakis I've kept the calls to the new ty::Instance::resolve(....) always .unwrap()-ing for the moment, how/do you want to add more debugging info via .unwrap_or() or something like this?

we still have some related resolve_* functions on monomorphize, but I wasn't sure moving them was into the scope for this PR too.

@eddyb mind to take a look too?

rust-highfive · 2017-09-28T03:28:56Z

r? @nikomatsakis

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eddyb · 2017-09-28T10:47:45Z

src/librustc/ty/instance.rs

+        result
+    }
+
+


Two unnecessary empty lines.

eddyb · 2017-09-28T10:48:30Z

src/librustc_trans/callee.rs

+    get_fn(ccx, ty::Instance::resolve(ccx.tcx(),
+    ty::ParamEnv::empty(traits::Reveal::All),
+    def_id,
+    substs).unwrap())


The indentation here is off - it should be at least once to the right for the 3 above lines.

eddyb · 2017-09-28T10:48:52Z

src/librustc_trans/mir/block.rs

+                        (Some(ty::Instance::resolve(bcx.ccx.tcx(),
+                        ty::ParamEnv::empty(traits::Reveal::All),
+                        def_id,
+                        substs).unwrap()),


Same indentation problem here.

eddyb · 2017-09-28T10:48:58Z

src/librustc_trans/mir/constant.rs

+        let instance = ty::Instance::resolve(ccx.tcx(),
+        ty::ParamEnv::empty(traits::Reveal::All),
+        def_id,
+        substs).unwrap();


nikomatsakis

OK I left a few thoughts. Most some pre-existing nits that aren't your fault, but which I would like to see fixed. The other question in my mind is whether to make this a query. We probably need some more guidelines on that point. =)

nikomatsakis · 2017-09-28T13:17:33Z

src/librustc_trans/callee.rs

@@ -179,5 +180,8 @@ pub fn resolve_and_get_fn<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
                                    substs: &'tcx Substs<'tcx>)
                                    -> ValueRef
 {
-    get_fn(ccx, monomorphize::resolve(ccx.tcx(), def_id, substs))
+    get_fn(ccx, ty::Instance::resolve(ccx.tcx(),


Nit: I try not to be a stickler on formatting (rustfmt can't come soon enough), but I find this particular line rather hard to parse. It looks to my eye like the lines below are additional arguments to get_fn. I'd prefer to see ty::Instance::resolve on a line of its own, and its arguments indented relative to it.

For example, you might do something like:

get_fn( ccx, ty::Instance::resolve( ccx.tcx(), ty::ParamEnv::empty(traits::Reveal::All), def_id, substs, ).unwrap(), )

(I believe this is roughly what rustfmt would do here.)

nikomatsakis · 2017-09-28T14:09:42Z

src/librustc/ty/instance.rs

+
+    /// The point where linking happens. Resolve a (def_id, substs)
+    /// pair to an instance.
+    pub fn resolve(tcx: TyCtxt<'a, 'tcx, 'tcx>,


I wonder if this should be a query. Seems like a handy thing to cache.

If we did make it a query, I'd prefer to see the provider moved into traits/instance or something.

nikomatsakis · 2017-09-28T14:21:24Z

src/librustc/ty/instance.rs

@@ -111,4 +115,192 @@ impl<'a, 'b, 'tcx> Instance<'tcx> {
    pub fn def_id(&self) -> DefId {
        self.def.def_id()
    }
+
+    /// The point where linking happens. Resolve a (def_id, substs)
+    /// pair to an instance.


I think this comment could say a lot more. Example:

// Resolve a (def_id, substs) pair to an (optional) instance -- most commonly, // this is used to find the precise code that will run for a trait method invocation, // if known. // // Returns `None` if we cannot resolve `Instance` to a specific instance. // For example, in a context like this, // // ``` // fn foo<T: Debug>(t: T) { ... } // ``` // // trying to resolve `Debug::fmt` applied to `T` will yield `None`, because we do not // know what code ought to run. (Note that this setting is also affected by the // `RevealMode` in the parameter environment.) // // Presuming that coherence and type-check have succeeded, if this method is invoked // in a monomorphic context (i.e., like during trans), then it is guaranteed to return // `Some`.

nikomatsakis · 2017-09-28T14:23:42Z

src/librustc/ty/instance.rs

+                substs: rcvr_substs
+            })
+        }
+        _ => {


This is pre-existing, but I would rather see this match be made exhaustive. My usual rule of thumb is this:

If a new variant is added to traits::Vtable, how likely is that this code will have to be changed?

If the answer is anything other than "rather unlikely", the match should be exhaustive. Here I would say the answer is "very likely".

To make it exhaustive, I would probably remove the if clauses from the various arms, and move them into the body. e.g., if Some(trait_id) == clone_trait { ... } else { None }.

nikomatsakis · 2017-09-28T14:24:36Z

src/librustc/ty/instance.rs

+                // These are both the same at trans time.
+                Ok(true)
+            }
+        _ => Err(()),


Also pre-existing, but I would make this exhaustive by adding variants like:

(ty::ClosureKind::FnMut, _) | (ty::ClosureKind::FnOnce, _) => Err(())

this fixes rust-lang#44389

arielb1 · 2017-09-30T09:38:03Z

src/librustc_trans/callee.rs

+            ccx.tcx(),
+            ty::ParamEnv::empty(traits::Reveal::All),
+            def_id,
+            substs,)


nit: extra comma

arielb1 · 2017-09-30T09:39:27Z

r+ with stray comma fixed

qmx · 2017-09-30T15:09:58Z

@arielb1 there you go - I could swear I've fixed before :/

arielb1 · 2017-10-01T13:02:02Z

src/librustc_trans/callee.rs

@@ -186,7 +186,7 @@ pub fn resolve_and_get_fn<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
            ccx.tcx(),
            ty::ParamEnv::empty(traits::Reveal::All),
            def_id,
-            substs,)
-        .unwrap()
+            substs,


still a stray comma,

arielb1 · 2017-10-01T15:33:46Z

@bors r+

bors · 2017-10-01T15:33:47Z

📌 Commit 11e141e has been approved by arielb1

bors · 2017-10-01T16:11:02Z

⌛ Testing commit 11e141e with merge 8e8b47f5c004d8f30dc4bb65cc60206ec2a81b88...

bors · 2017-10-01T17:32:31Z

💔 Test failed - status-appveyor

aidanhs · 2017-10-02T11:17:50Z

@bors retry

#43402

bors · 2017-10-02T20:17:43Z

⌛ Testing commit 11e141e with merge fa1d352c7c162da84114bbd4ab58edff3368ceff...

bors · 2017-10-02T21:16:12Z

💔 Test failed - status-travis

sfackler · 2017-10-02T22:02:54Z

@bors retry

bors · 2017-10-03T01:05:27Z

⌛ Testing commit 11e141e with merge 6c39ff409c79d5d4acc5025988a45d10359189e6...

bors · 2017-10-03T02:26:22Z

💔 Test failed - status-appveyor

qmx · 2017-10-03T03:01:10Z

Apparently, this is failing on a completely unrelated thing - test suite runs cleanly locally :(

arielb1 · 2017-10-03T09:35:41Z

Spurious failure in issue-26092 #43402
@bors retry

bors · 2017-10-03T12:18:19Z

⌛ Testing commit 11e141e with merge 8891044...

@nikomatsakis

Move monomorphize::resolve() to librustc this moves `monomorphize::resolve(..)` to librustc, and re-enables inlining for some trait methods, fixing #44389 @nikomatsakis I've kept the calls to the new `ty::Instance::resolve(....)` always `.unwrap()`-ing for the moment, how/do you want to add more debugging info via `.unwrap_or()` or something like this? we still have some related `resolve_*` functions on monomorphize, but I wasn't sure moving them was into the scope for this PR too. @eddyb mind to take a look too?

bors · 2017-10-03T14:44:04Z

☀️ Test successful - status-appveyor, status-travis
Approved by: arielb1
Pushing 8891044 to master...

rust-highfive assigned nikomatsakis Sep 28, 2017

eddyb reviewed Sep 28, 2017

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src/librustc/ty/instance.rs Outdated

result

}

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eddyb Sep 28, 2017

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Two unnecessary empty lines.

eddyb reviewed Sep 28, 2017

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qmx force-pushed the move-resolve-to-librustc branch from 9789b66 to 9e24115 Compare September 28, 2017 12:40

alexcrichton added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Sep 28, 2017

nikomatsakis requested changes Sep 28, 2017

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qmx added 10 commits September 29, 2017 22:34

copy resolve() over to librustc

baa0105

re-enable mir inlining across trait methods

3bd09de

this fixes rust-lang#44389

always use resolve

5eb302f

make it not to be a method

24fc50f

take ParamEnv into account when resolving

8a5800e

stop using monomorphize::resolve()

081b29c

style fixes as requested by @eddyb

2922066

fix formatting

08e1f0b

improve documentation for resolve()

59e778e

make match exaustive

a29c770

qmx force-pushed the move-resolve-to-librustc branch from 6028d9c to a29c770 Compare September 30, 2017 02:35

arielb1 reviewed Sep 30, 2017

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src/librustc_trans/callee.rs Outdated

ccx.tcx(),

ty::ParamEnv::empty(traits::Reveal::All),

def_id,

substs,)

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arielb1 Sep 30, 2017

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nit: extra comma

weird formatting

b24a672

arielb1 reviewed Oct 1, 2017

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stray comma

11e141e

nikomatsakis approved these changes Oct 3, 2017

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bors merged commit 11e141e into rust-lang:master Oct 3, 2017

bors mentioned this pull request Oct 3, 2017

Turn trans_fulfill_obligation into a query #44967

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qmx deleted the move-resolve-to-librustc branch October 3, 2017 15:01

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Move monomorphize::resolve() to librustc #44896

Move monomorphize::resolve() to librustc #44896

qmx commented Sep 28, 2017

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Move monomorphize::resolve() to librustc #44896

Move monomorphize::resolve() to librustc #44896

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