Move try_print_query_stack to rustc_interface.

1 files changed, 22 insertions, 1 deletions

diff --git a/compiler/rustc_interface/src/interface.rs b/compiler/rustc_interface/src/interface.rs
index 28eb1fed6a0..502e7155c2e 100644
--- a/compiler/rustc_interface/src/interface.rs
+++ b/compiler/rustc_interface/src/interface.rs
@@ -8,7 +8,7 @@ use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::Lrc;
 use rustc_data_structures::OnDrop;
 use rustc_errors::registry::Registry;
-use rustc_errors::ErrorReported;
+use rustc_errors::{ErrorReported, Handler};
 use rustc_lint::LintStore;
 use rustc_middle::ty;
 use rustc_parse::new_parser_from_source_str;
@@ -213,3 +213,24 @@ pub fn run_compiler<R: Send>(mut config: Config, f: impl FnOnce(&Compiler) -> R
         || create_compiler_and_run(config, f),
     )
 }
+
+pub fn try_print_query_stack(handler: &Handler, num_frames: Option<usize>) {
+    eprintln!("query stack during panic:");
+
+    // Be careful relying on global state here: this code is called from
+    // a panic hook, which means that the global `Handler` may be in a weird
+    // state if it was responsible for triggering the panic.
+    let i = ty::tls::with_context_opt(|icx| {
+        if let Some(icx) = icx {
+            icx.tcx.queries.try_print_query_stack(icx.tcx, icx.query, handler, num_frames)
+        } else {
+            0
+        }
+    });
+
+    if num_frames == None || num_frames >= Some(i) {
+        eprintln!("end of query stack");
+    } else {
+        eprintln!("we're just showing a limited slice of the query stack");
+    }
+}