Rollup merge of #117317 - RalfJung:track-caller, r=oli-obk

share some track_caller logic between interpret and codegen

Also move the code that implements the track_caller intrinsics out of the core interpreter engine -- it's just a helper creating a const-allocation, doesn't need to be part of the interpreter core.

src/common.rs

@@ -430,47 +430,11 @@ impl<'tcx> FunctionCx<'_, '_, 'tcx> {
         }
     }
 
-    // Note: must be kept in sync with get_caller_location from cg_ssa
-    pub(crate) fn get_caller_location(&mut self, mut source_info: mir::SourceInfo) -> CValue<'tcx> {
-        let span_to_caller_location = |fx: &mut FunctionCx<'_, '_, 'tcx>, span: Span| {
-            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((
-                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())
-        };
-
-        // Walk up the `SourceScope`s, in case some of them are from MIR inlining.
-        // If so, the starting `source_info.span` is in the innermost inlined
-        // function, and will be replaced with outer callsite spans as long
-        // as the inlined functions were `#[track_caller]`.
-        loop {
-            let scope_data = &self.mir.source_scopes[source_info.scope];
-
-            if let Some((callee, callsite_span)) = scope_data.inlined {
-                // Stop inside the most nested non-`#[track_caller]` function,
-                // before ever reaching its caller (which is irrelevant).
-                if !callee.def.requires_caller_location(self.tcx) {
-                    return span_to_caller_location(self, source_info.span);
-                }
-                source_info.span = callsite_span;
-            }
-
-            // Skip past all of the parents with `inlined: None`.
-            match scope_data.inlined_parent_scope {
-                Some(parent) => source_info.scope = parent,
-                None => break,
-            }
-        }
-
-        // No inlined `SourceScope`s, or all of them were `#[track_caller]`.
-        self.caller_location.unwrap_or_else(|| span_to_caller_location(self, source_info.span))
+    pub(crate) fn get_caller_location(&mut self, source_info: mir::SourceInfo) -> CValue<'tcx> {
+        self.mir.caller_location_span(source_info, self.caller_location, self.tcx, |span| {
+            let const_loc = self.tcx.span_as_caller_location(span);
+            crate::constant::codegen_const_value(self, const_loc, self.tcx.caller_location_ty())
+        })
     }
 
     pub(crate) fn anonymous_str(&mut self, msg: &str) -> Value {