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Rollup merge of #101801 - SparrowLii:query_depth_note, r=estebank

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add note for `layout_of` when query depth overflows

Fixes #101747
Added `try_find_layout_root` function to add a note for `layout_of` when query depth overflows. This would make the error in #101747 look like this:
```
error: queries overflow the depth limit!
   |
note: Query depth increased by 66 when computing layout of `core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<alloc::boxed::Box<alloc::string::String>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`!
  --> D:\rust-backup\parallel_rust\query_depth.rs:40:1
   |
40 | fn main() {
   | ^^^^^^^^^

error: aborting due to previous error
```

cc ``@semicoleon``
This commit is contained in:
Matthias Krüger 2022-09-17 19:27:06 +02:00 committed by GitHub
commit 4757d2d57e
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GPG key ID: 4AEE18F83AFDEB23
8 changed files with 114 additions and 9 deletions
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3
compiler/rustc_error_messages/locales/en-US/query_system.ftl
View file

@ -23,3 +23,6 @@ query_system_cycle_recursive_trait_alias = trait aliases cannot be recursive
query_system_cycle_which_requires = ...which requires {$desc}...
query_system_query_overflow = queries overflow the depth limit!
.help = consider increasing the recursion limit by adding a `#![recursion_limit = "{$suggested_limit}"]` attribute to your crate (`{$crate_name}`)
query_system_layout_of_depth = query depth increased by {$depth} when {$desc}

29
compiler/rustc_query_impl/src/plumbing.rs
View file

@ -19,8 +19,10 @@ use rustc_query_system::query::{
force_query, QueryConfig, QueryContext, QueryDescription, QueryJobId, QueryMap,
QuerySideEffects, QueryStackFrame,
};
use rustc_query_system::Value;
use rustc_query_system::{LayoutOfDepth, QueryOverflow, Value};
use rustc_serialize::Decodable;
use rustc_session::Limit;
use rustc_span::def_id::LOCAL_CRATE;
use std::any::Any;
use std::num::NonZeroU64;
use thin_vec::ThinVec;
@ -109,7 +111,7 @@ impl QueryContext for QueryCtxt<'_> {
// when accessing the `ImplicitCtxt`.
tls::with_related_context(**self, move |current_icx| {
if depth_limit && !self.recursion_limit().value_within_limit(current_icx.query_depth) {
self.depth_limit_error();
self.depth_limit_error(token);
}
// Update the `ImplicitCtxt` to point to our new query job.
@ -127,6 +129,29 @@ impl QueryContext for QueryCtxt<'_> {
})
})
}
fn depth_limit_error(&self, job: QueryJobId) {
let mut span = None;
let mut layout_of_depth = None;
if let Some(map) = self.try_collect_active_jobs() {
if let Some((info, depth)) = job.try_find_layout_root(map) {
span = Some(info.job.span);
layout_of_depth = Some(LayoutOfDepth { desc: info.query.description, depth });
}
}
let suggested_limit = match self.recursion_limit() {
Limit(0) => Limit(2),
limit => limit * 2,
};
self.sess.emit_fatal(QueryOverflow {
span,
layout_of_depth,
suggested_limit,
crate_name: self.crate_name(LOCAL_CRATE),
});
}
}
impl<'tcx> QueryCtxt<'tcx> {

20
compiler/rustc_query_system/src/error.rs
View file

@ -1,5 +1,6 @@
use rustc_errors::AddSubdiagnostic;
use rustc_span::Span;
use rustc_session::Limit;
use rustc_span::{Span, Symbol};
pub struct CycleStack {
pub span: Span,
@ -76,5 +77,20 @@ pub struct IncrementCompilation {
}
#[derive(SessionDiagnostic)]
#[help]
#[diag(query_system::query_overflow)]
pub struct QueryOverflow;
pub struct QueryOverflow {
#[primary_span]
pub span: Option<Span>,
#[subdiagnostic]
pub layout_of_depth: Option<LayoutOfDepth>,
pub suggested_limit: Limit,
pub crate_name: Symbol,
}
#[derive(SessionSubdiagnostic)]
#[note(query_system::layout_of_depth)]
pub struct LayoutOfDepth {
pub desc: String,
pub depth: usize,
}

2
compiler/rustc_query_system/src/lib.rs
View file

@ -23,4 +23,6 @@ pub mod query;
mod values;
pub use error::HandleCycleError;
pub use error::LayoutOfDepth;
pub use error::QueryOverflow;
pub use values::Value;

21
compiler/rustc_query_system/src/query/job.rs
View file

@ -59,6 +59,7 @@ impl QueryJobId {
}
}
#[derive(Clone)]
pub struct QueryJobInfo {
pub query: QueryStackFrame,
pub job: QueryJob,
@ -116,10 +117,10 @@ impl QueryJob {
}
}
#[cfg(not(parallel_compiler))]
impl QueryJobId {
#[cold]
#[inline(never)]
#[cfg(not(parallel_compiler))]
pub(super) fn find_cycle_in_stack(
&self,
query_map: QueryMap,
@ -156,6 +157,24 @@ impl QueryJobId {
panic!("did not find a cycle")
}
#[cold]
#[inline(never)]
pub fn try_find_layout_root(&self, query_map: QueryMap) -> Option<(QueryJobInfo, usize)> {
let mut last_layout = None;
let mut current_id = Some(*self);
let mut depth = 0;
while let Some(id) = current_id {
let info = query_map.get(&id).unwrap();
if info.query.name == "layout_of" {
depth += 1;
last_layout = Some((info.clone(), depth));
}
current_id = info.job.parent;
}
last_layout
}
}
#[cfg(parallel_compiler)]

6
compiler/rustc_query_system/src/query/mod.rs
View file

@ -14,7 +14,7 @@ pub use self::caches::{
mod config;
pub use self::config::{QueryConfig, QueryDescription, QueryVTable};
use crate::dep_graph::{DepContext, DepNodeIndex, HasDepContext, SerializedDepNodeIndex};
use crate::dep_graph::{DepNodeIndex, HasDepContext, SerializedDepNodeIndex};
use rustc_data_structures::sync::Lock;
use rustc_errors::Diagnostic;
use rustc_hir::def::DefKind;
@ -123,7 +123,5 @@ pub trait QueryContext: HasDepContext {
compute: impl FnOnce() -> R,
) -> R;
fn depth_limit_error(&self) {
self.dep_context().sess().emit_fatal(crate::error::QueryOverflow);
}
fn depth_limit_error(&self, job: QueryJobId);
}

31
src/test/ui/query-system/query_depth.rs Normal file
View file

@ -0,0 +1,31 @@
// build-fail
#![recursion_limit = "64"]
type Byte = Option<Option<Option<Option< Option<Option<Option<Option<
Option<Option<Option<Option< Option<Option<Option<Option<
Option<Option<Option<Option< Option<Option<Option<Option<
Option<Option<Option<Option< Option<Option<Option<Option<
Option<Option<Option<Option< Option<Option<Option<Option<
Option<Option<Option<Option< Option<Option<Option<Option<
Option<Option<Option<Option< Option<Option<Option<Option<
Option<Option<Option<Option< Option<Option<Option<Option<
Option<Option<Option<Option< Option<Option<Option<Option<
Option<Option<Option<Option< Option<Option<Option<Option<
Option<Option<Option<Option< Option<Option<Option<Option<
Box<String>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>;
fn main() {
//~^ ERROR: queries overflow the depth limit!
println!("{}", std::mem::size_of::<Byte>());
}

11
src/test/ui/query-system/query_depth.stderr Normal file
View file

@ -0,0 +1,11 @@
error: queries overflow the depth limit!
--> $DIR/query_depth.rs:28:1
|
LL | fn main() {
| ^^^^^^^^^
|
= help: consider increasing the recursion limit by adding a `#![recursion_limit = "128"]` attribute to your crate (`query_depth`)
= note: query depth increased by 66 when computing layout of `core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<alloc::boxed::Box<alloc::string::String>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
error: aborting due to previous error