Auto merge of rust-lang#117388 - oli-obk:dequerification, r=<try>

Turn const_caller_location from a query to a hook

blocked on rust-lang#117317

cc `@RalfJung`

Author: bors

compiler/rustc_codegen_cranelift/src/common.rs

@@ -436,13 +436,13 @@ impl<'tcx> FunctionCx<'_, '_, 'tcx> {
             use rustc_session::RemapFileNameExt;
             let topmost = span.ctxt().outer_expn().expansion_cause().unwrap_or(span);
             let caller = fx.tcx.sess.source_map().lookup_char_pos(topmost.lo());
-            let const_loc = fx.tcx.const_caller_location((
+            let const_loc = fx.tcx.const_caller_location(
                 rustc_span::symbol::Symbol::intern(
                     &caller.file.name.for_codegen(&fx.tcx.sess).to_string_lossy(),
                 ),
                 caller.line as u32,
                 caller.col_display as u32 + 1,
-            ));
+            );
             crate::constant::codegen_const_value(fx, const_loc, fx.tcx.caller_location_ty())
         };
 

compiler/rustc_codegen_ssa/src/mir/block.rs

@@ -1457,11 +1457,11 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
             use rustc_session::RemapFileNameExt;
             let topmost = span.ctxt().outer_expn().expansion_cause().unwrap_or(span);
             let caller = tcx.sess.source_map().lookup_char_pos(topmost.lo());
-            let const_loc = tcx.const_caller_location((
+            let const_loc = tcx.const_caller_location(
                 Symbol::intern(&caller.file.name.for_codegen(self.cx.sess()).to_string_lossy()),
                 caller.line as u32,
                 caller.col_display as u32 + 1,
-            ));
+            );
             OperandRef::from_const(bx, const_loc, bx.tcx().caller_location_ty())
         };
 

compiler/rustc_const_eval/src/const_eval/mod.rs

@@ -21,11 +21,12 @@ pub use machine::*;
 pub(crate) use valtrees::{const_to_valtree_inner, valtree_to_const_value};
 
 pub(crate) fn const_caller_location(
-    tcx: TyCtxt<'_>,
-    (file, line, col): (Symbol, u32, u32),
+    tcx: TyCtxtAt<'_>,
+    file: Symbol,
+    line: u32,
+    col: u32,
 ) -> mir::ConstValue<'_> {
-    trace!("const_caller_location: {}:{}:{}", file, line, col);
-    let mut ecx = mk_eval_cx(tcx, DUMMY_SP, ty::ParamEnv::reveal_all(), CanAccessStatics::No);
+    let mut ecx = mk_eval_cx(tcx.tcx, tcx.span, ty::ParamEnv::reveal_all(), CanAccessStatics::No);
 
     let loc_place = ecx.alloc_caller_location(file, line, col);
     if intern_const_alloc_recursive(&mut ecx, InternKind::Constant, &loc_place).is_err() {

compiler/rustc_const_eval/src/lib.rs

@@ -49,7 +49,7 @@ pub fn provide(providers: &mut Providers) {
     const_eval::provide(providers);
     providers.eval_to_const_value_raw = const_eval::eval_to_const_value_raw_provider;
     providers.eval_to_allocation_raw = const_eval::eval_to_allocation_raw_provider;
-    providers.const_caller_location = const_eval::const_caller_location;
+    providers.hooks.const_caller_location = const_eval::const_caller_location;
     providers.eval_to_valtree = |tcx, param_env_and_value| {
         let (param_env, raw) = param_env_and_value.into_parts();
         const_eval::eval_to_valtree(tcx, param_env, raw)

compiler/rustc_middle/src/hooks/mod.rs

@@ -67,4 +67,7 @@ declare_hooks! {
     /// Tries to destructure an `mir::Const` ADT or array into its variant index
     /// and its field values. This should only be used for pretty printing.
     hook try_destructure_mir_constant_for_diagnostics(val: mir::ConstValue<'tcx>, ty: Ty<'tcx>) -> Option<mir::DestructuredConstant<'tcx>>;
+
+    /// Getting a &core::panic::Location referring to a span.
+    hook const_caller_location(file: rustc_span::Symbol, line: u32, col: u32) -> mir::ConstValue<'tcx>;
 }

compiler/rustc_middle/src/query/mod.rs

@@ -1101,10 +1101,6 @@ rustc_queries! {
         desc { "destructuring type level constant"}
     }
 
-    query const_caller_location(key: (rustc_span::Symbol, u32, u32)) -> mir::ConstValue<'tcx> {
-        desc { "getting a &core::panic::Location referring to a span" }
-    }
-
     // FIXME get rid of this with valtrees
     query lit_to_const(
         key: LitToConstInput<'tcx>