| use rustc::middle::lang_items::PanicLocationLangItem; |
| use rustc::ty::subst::Subst; |
| use rustc_target::abi::LayoutOf; |
| use syntax_pos::{Symbol, Span}; |
| |
| use crate::interpret::{Scalar, MemoryKind, MPlaceTy, intrinsics::{InterpCx, Machine}}; |
| |
| impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> { |
| /// Walks up the callstack from the intrinsic's callsite, searching for the first frame which is |
| /// not `#[track_caller]`. |
| crate fn find_closest_untracked_caller_location(&self) -> Option<Span> { |
| let mut caller_span = None; |
| for next_caller in self.stack.iter().rev() { |
| if !next_caller.instance.def.requires_caller_location(*self.tcx) { |
| return caller_span; |
| } |
| caller_span = Some(next_caller.span); |
| } |
| |
| caller_span |
| } |
| |
| /// Allocate a `const core::panic::Location` with the provided filename and line/column numbers. |
| crate fn alloc_caller_location( |
| &mut self, |
| filename: Symbol, |
| line: u32, |
| col: u32, |
| ) -> MPlaceTy<'tcx, M::PointerTag> { |
| let file = self.allocate_str(&filename.as_str(), MemoryKind::CallerLocation); |
| let line = Scalar::from_u32(line); |
| let col = Scalar::from_u32(col); |
| |
| // Allocate memory for `CallerLocation` struct. |
| let loc_ty = self.tcx.type_of(self.tcx.require_lang_item(PanicLocationLangItem, None)) |
| .subst(*self.tcx, self.tcx.mk_substs([self.tcx.lifetimes.re_static.into()].iter())); |
| let loc_layout = self.layout_of(loc_ty).unwrap(); |
| let location = self.allocate(loc_layout, MemoryKind::CallerLocation); |
| |
| // Initialize fields. |
| self.write_immediate(file.to_ref(), self.mplace_field(location, 0).unwrap().into()) |
| .expect("writing to memory we just allocated cannot fail"); |
| self.write_scalar(line, self.mplace_field(location, 1).unwrap().into()) |
| .expect("writing to memory we just allocated cannot fail"); |
| self.write_scalar(col, self.mplace_field(location, 2).unwrap().into()) |
| .expect("writing to memory we just allocated cannot fail"); |
| |
| location |
| } |
| |
| pub fn alloc_caller_location_for_span( |
| &mut self, |
| span: Span, |
| ) -> MPlaceTy<'tcx, M::PointerTag> { |
| let topmost = span.ctxt().outer_expn().expansion_cause().unwrap_or(span); |
| let caller = self.tcx.sess.source_map().lookup_char_pos(topmost.lo()); |
| self.alloc_caller_location( |
| Symbol::intern(&caller.file.name.to_string()), |
| caller.line as u32, |
| caller.col_display as u32 + 1, |
| ) |
| } |
| } |