From 669f610f741f41bc8b2bef41d088589db4180355 Mon Sep 17 00:00:00 2001 From: Veera Date: Sat, 21 Sep 2024 11:23:34 -0400 Subject: [PATCH] Prevent Deduplication of `LongRunningWarn` --- .../src/const_eval/machine.rs | 9 ++- compiler/rustc_const_eval/src/errors.rs | 2 + .../evade-deduplication-issue-118612.stderr | 74 ++++++++++++++++++- 3 files changed, 83 insertions(+), 2 deletions(-) diff --git a/compiler/rustc_const_eval/src/const_eval/machine.rs b/compiler/rustc_const_eval/src/const_eval/machine.rs index 7405ca09342da..2025a465a2289 100644 --- a/compiler/rustc_const_eval/src/const_eval/machine.rs +++ b/compiler/rustc_const_eval/src/const_eval/machine.rs @@ -641,7 +641,14 @@ impl<'tcx> interpret::Machine<'tcx> for CompileTimeMachine<'tcx> { // current number of evaluated terminators is a power of 2. The latter gives us a cheap // way to implement exponential backoff. let span = ecx.cur_span(); - ecx.tcx.dcx().emit_warn(LongRunningWarn { span, item_span: ecx.tcx.span }); + // We store a unique number in `force_duplicate` to evade `-Z deduplicate-diagnostics`. + // `new_steps` is guaranteed to be unique because `ecx.machine.num_evaluated_steps` is + // always increasing. + ecx.tcx.dcx().emit_warn(LongRunningWarn { + span, + item_span: ecx.tcx.span, + force_duplicate: new_steps, + }); } } diff --git a/compiler/rustc_const_eval/src/errors.rs b/compiler/rustc_const_eval/src/errors.rs index 0b366b43f95f6..bdd8c66bc244d 100644 --- a/compiler/rustc_const_eval/src/errors.rs +++ b/compiler/rustc_const_eval/src/errors.rs @@ -243,6 +243,8 @@ pub struct LongRunningWarn { pub span: Span, #[help] pub item_span: Span, + // Used for evading `-Z deduplicate-diagnostics`. + pub force_duplicate: usize, } #[derive(Subdiagnostic)] diff --git a/tests/ui/consts/const-eval/stable-metric/evade-deduplication-issue-118612.stderr b/tests/ui/consts/const-eval/stable-metric/evade-deduplication-issue-118612.stderr index b894b7b2132df..cb19c59b15bc0 100644 --- a/tests/ui/consts/const-eval/stable-metric/evade-deduplication-issue-118612.stderr +++ b/tests/ui/consts/const-eval/stable-metric/evade-deduplication-issue-118612.stderr @@ -16,5 +16,77 @@ help: the constant being evaluated LL | const FOO: () = { | ^^^^^^^^^^^^^ -warning: 1 warning emitted +warning: constant evaluation is taking a long time + --> $DIR/evade-deduplication-issue-118612.rs:8:5 + | +LL | / loop { +LL | | +LL | | +LL | | +... | +LL | | } +LL | | } + | |_____^ the const evaluator is currently interpreting this expression + | +help: the constant being evaluated + --> $DIR/evade-deduplication-issue-118612.rs:6:1 + | +LL | const FOO: () = { + | ^^^^^^^^^^^^^ + +warning: constant evaluation is taking a long time + --> $DIR/evade-deduplication-issue-118612.rs:8:5 + | +LL | / loop { +LL | | +LL | | +LL | | +... | +LL | | } +LL | | } + | |_____^ the const evaluator is currently interpreting this expression + | +help: the constant being evaluated + --> $DIR/evade-deduplication-issue-118612.rs:6:1 + | +LL | const FOO: () = { + | ^^^^^^^^^^^^^ + +warning: constant evaluation is taking a long time + --> $DIR/evade-deduplication-issue-118612.rs:8:5 + | +LL | / loop { +LL | | +LL | | +LL | | +... | +LL | | } +LL | | } + | |_____^ the const evaluator is currently interpreting this expression + | +help: the constant being evaluated + --> $DIR/evade-deduplication-issue-118612.rs:6:1 + | +LL | const FOO: () = { + | ^^^^^^^^^^^^^ + +warning: constant evaluation is taking a long time + --> $DIR/evade-deduplication-issue-118612.rs:8:5 + | +LL | / loop { +LL | | +LL | | +LL | | +... | +LL | | } +LL | | } + | |_____^ the const evaluator is currently interpreting this expression + | +help: the constant being evaluated + --> $DIR/evade-deduplication-issue-118612.rs:6:1 + | +LL | const FOO: () = { + | ^^^^^^^^^^^^^ + +warning: 5 warnings emitted