Move rustc_mir::transform to rustc_mir_transform.

compiler/rustc_mir_transform/src/check_packed_ref.rs

@@ -0,0 +1,115 @@
+use rustc_hir::def_id::{DefId, LocalDefId};
+use rustc_middle::mir::visit::{PlaceContext, Visitor};
+use rustc_middle::mir::*;
+use rustc_middle::ty::query::Providers;
+use rustc_middle::ty::{self, TyCtxt};
+use rustc_session::lint::builtin::UNALIGNED_REFERENCES;
+use rustc_span::symbol::sym;
+
+use crate::util;
+use crate::MirPass;
+
+pub(crate) fn provide(providers: &mut Providers) {
+    *providers = Providers { unsafe_derive_on_repr_packed, ..*providers };
+}
+
+pub struct CheckPackedRef;
+
+impl<'tcx> MirPass<'tcx> for CheckPackedRef {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
+        let param_env = tcx.param_env(body.source.def_id());
+        let source_info = SourceInfo::outermost(body.span);
+        let mut checker = PackedRefChecker { body, tcx, param_env, source_info };
+        checker.visit_body(&body);
+    }
+}
+
+struct PackedRefChecker<'a, 'tcx> {
+    body: &'a Body<'tcx>,
+    tcx: TyCtxt<'tcx>,
+    param_env: ty::ParamEnv<'tcx>,
+    source_info: SourceInfo,
+}
+
+fn unsafe_derive_on_repr_packed(tcx: TyCtxt<'_>, def_id: LocalDefId) {
+    let lint_hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
+
+    tcx.struct_span_lint_hir(UNALIGNED_REFERENCES, lint_hir_id, tcx.def_span(def_id), |lint| {
+        // FIXME: when we make this a hard error, this should have its
+        // own error code.
+        let message = if tcx.generics_of(def_id).own_requires_monomorphization() {
+            "`#[derive]` can't be used on a `#[repr(packed)]` struct with \
+             type or const parameters (error E0133)"
+                .to_string()
+        } else {
+            "`#[derive]` can't be used on a `#[repr(packed)]` struct that \
+             does not derive Copy (error E0133)"
+                .to_string()
+        };
+        lint.build(&message).emit()
+    });
+}
+
+fn builtin_derive_def_id(tcx: TyCtxt<'_>, def_id: DefId) -> Option<DefId> {
+    debug!("builtin_derive_def_id({:?})", def_id);
+    if let Some(impl_def_id) = tcx.impl_of_method(def_id) {
+        if tcx.has_attr(impl_def_id, sym::automatically_derived) {
+            debug!("builtin_derive_def_id({:?}) - is {:?}", def_id, impl_def_id);
+            Some(impl_def_id)
+        } else {
+            debug!("builtin_derive_def_id({:?}) - not automatically derived", def_id);
+            None
+        }
+    } else {
+        debug!("builtin_derive_def_id({:?}) - not a method", def_id);
+        None
+    }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for PackedRefChecker<'a, 'tcx> {
+    fn visit_terminator(&mut self, terminator: &Terminator<'tcx>, location: Location) {
+        // Make sure we know where in the MIR we are.
+        self.source_info = terminator.source_info;
+        self.super_terminator(terminator, location);
+    }
+
+    fn visit_statement(&mut self, statement: &Statement<'tcx>, location: Location) {
+        // Make sure we know where in the MIR we are.
+        self.source_info = statement.source_info;
+        self.super_statement(statement, location);
+    }
+
+    fn visit_place(&mut self, place: &Place<'tcx>, context: PlaceContext, _location: Location) {
+        if context.is_borrow() {
+            if util::is_disaligned(self.tcx, self.body, self.param_env, *place) {
+                let def_id = self.body.source.instance.def_id();
+                if let Some(impl_def_id) = builtin_derive_def_id(self.tcx, def_id) {
+                    // If a method is defined in the local crate,
+                    // the impl containing that method should also be.
+                    self.tcx.ensure().unsafe_derive_on_repr_packed(impl_def_id.expect_local());
+                } else {
+                    let source_info = self.source_info;
+                    let lint_root = self.body.source_scopes[source_info.scope]
+                        .local_data
+                        .as_ref()
+                        .assert_crate_local()
+                        .lint_root;
+                    self.tcx.struct_span_lint_hir(
+                        UNALIGNED_REFERENCES,
+                        lint_root,
+                        source_info.span,
+                        |lint| {
+                            lint.build("reference to packed field is unaligned")
+                                .note(
+                                    "fields of packed structs are not properly aligned, and creating \
+                                    a misaligned reference is undefined behavior (even if that \
+                                    reference is never dereferenced)",
+                                )
+                                .emit()
+                        },
+                    );
+                }
+            }
+        }
+    }
+}