diff options
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/mir/debuginfo.rs | 98 |
1 files changed, 50 insertions, 48 deletions
diff --git a/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs b/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs index 4e5e2dd5d50..805dfab2cc1 100644 --- a/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs +++ b/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs @@ -358,54 +358,56 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { let vars = vars.iter().cloned().chain(fallback_var); for var in vars { - let Some(dbg_var) = var.dbg_var else { continue }; - let Some(dbg_loc) = self.dbg_loc(var.source_info) else { continue }; - - let DebugInfoOffset { direct_offset, indirect_offsets, result: _ } = - calculate_debuginfo_offset(bx, local, &var, base.layout); - - // When targeting MSVC, create extra allocas for arguments instead of pointing multiple - // dbg_var_addr() calls into the same alloca with offsets. MSVC uses CodeView records - // not DWARF and LLVM doesn't support translating the resulting - // [DW_OP_deref, DW_OP_plus_uconst, offset, DW_OP_deref] debug info to CodeView. - // Creating extra allocas on the stack makes the resulting debug info simple enough - // that LLVM can generate correct CodeView records and thus the values appear in the - // debugger. (#83709) - let should_create_individual_allocas = bx.cx().sess().target.is_like_msvc - && self.mir.local_kind(local) == mir::LocalKind::Arg - // LLVM can handle simple things but anything more complex than just a direct - // offset or one indirect offset of 0 is too complex for it to generate CV records - // correctly. - && (direct_offset != Size::ZERO - || !matches!(&indirect_offsets[..], [Size::ZERO] | [])); - - if should_create_individual_allocas { - let DebugInfoOffset { direct_offset: _, indirect_offsets: _, result: place } = - calculate_debuginfo_offset(bx, local, &var, base); - - // Create a variable which will be a pointer to the actual value - let ptr_ty = bx - .tcx() - .mk_ptr(ty::TypeAndMut { mutbl: mir::Mutability::Mut, ty: place.layout.ty }); - let ptr_layout = bx.layout_of(ptr_ty); - let alloca = PlaceRef::alloca(bx, ptr_layout); - bx.set_var_name(alloca.llval, &(var.name.to_string() + ".dbg.spill")); - - // Write the pointer to the variable - bx.store(place.llval, alloca.llval, alloca.align); - - // Point the debug info to `*alloca` for the current variable - bx.dbg_var_addr(dbg_var, dbg_loc, alloca.llval, Size::ZERO, &[Size::ZERO], None); - } else { - bx.dbg_var_addr( - dbg_var, - dbg_loc, - base.llval, - direct_offset, - &indirect_offsets, - None, - ); - } + self.debug_introduce_local_as_var(bx, local, base, var); + } + } + + fn debug_introduce_local_as_var( + &self, + bx: &mut Bx, + local: mir::Local, + base: PlaceRef<'tcx, Bx::Value>, + var: PerLocalVarDebugInfo<'tcx, Bx::DIVariable>, + ) { + let Some(dbg_var) = var.dbg_var else { return }; + let Some(dbg_loc) = self.dbg_loc(var.source_info) else { return }; + + let DebugInfoOffset { direct_offset, indirect_offsets, result: _ } = + calculate_debuginfo_offset(bx, local, &var, base.layout); + + // When targeting MSVC, create extra allocas for arguments instead of pointing multiple + // dbg_var_addr() calls into the same alloca with offsets. MSVC uses CodeView records + // not DWARF and LLVM doesn't support translating the resulting + // [DW_OP_deref, DW_OP_plus_uconst, offset, DW_OP_deref] debug info to CodeView. + // Creating extra allocas on the stack makes the resulting debug info simple enough + // that LLVM can generate correct CodeView records and thus the values appear in the + // debugger. (#83709) + let should_create_individual_allocas = bx.cx().sess().target.is_like_msvc + && self.mir.local_kind(local) == mir::LocalKind::Arg + // LLVM can handle simple things but anything more complex than just a direct + // offset or one indirect offset of 0 is too complex for it to generate CV records + // correctly. + && (direct_offset != Size::ZERO || !matches!(&indirect_offsets[..], [Size::ZERO] | [])); + + if should_create_individual_allocas { + let DebugInfoOffset { direct_offset: _, indirect_offsets: _, result: place } = + calculate_debuginfo_offset(bx, local, &var, base); + + // Create a variable which will be a pointer to the actual value + let ptr_ty = bx + .tcx() + .mk_ptr(ty::TypeAndMut { mutbl: mir::Mutability::Mut, ty: place.layout.ty }); + let ptr_layout = bx.layout_of(ptr_ty); + let alloca = PlaceRef::alloca(bx, ptr_layout); + bx.set_var_name(alloca.llval, &(var.name.to_string() + ".dbg.spill")); + + // Write the pointer to the variable + bx.store(place.llval, alloca.llval, alloca.align); + + // Point the debug info to `*alloca` for the current variable + bx.dbg_var_addr(dbg_var, dbg_loc, alloca.llval, Size::ZERO, &[Size::ZERO], None); + } else { + bx.dbg_var_addr(dbg_var, dbg_loc, base.llval, direct_offset, &indirect_offsets, None); } } |