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use check::FnCtxt;
use rustc::hir;
use rustc::hir::def_id::{DefId, DefIndex};
use rustc::hir::intravisit::{self, NestedVisitorMap, Visitor};
use rustc::infer::InferCtxt;
use rustc::ty::adjustment::{Adjust, Adjustment};
use rustc::ty::fold::{BottomUpFolder, TypeFoldable, TypeFolder};
use rustc::ty::subst::UnpackedKind;
use rustc::ty::{self, Ty, TyCtxt};
use rustc::util::nodemap::DefIdSet;
use rustc_data_structures::sync::Lrc;
use std::mem;
use syntax::ast;
use syntax_pos::Span;
impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
pub fn resolve_type_vars_in_body(&self, body: &'gcx hir::Body) -> &'gcx ty::TypeckTables<'gcx> {
let item_id = self.tcx.hir.body_owner(body.id());
let item_def_id = self.tcx.hir.local_def_id(item_id);
let rustc_dump_user_substs = self.tcx.has_attr(item_def_id, "rustc_dump_user_substs");
let mut wbcx = WritebackCx::new(self, body, rustc_dump_user_substs);
for arg in &body.arguments {
wbcx.visit_node_id(arg.pat.span, arg.hir_id);
}
wbcx.visit_body(body);
wbcx.visit_upvar_borrow_map();
wbcx.visit_closures();
wbcx.visit_liberated_fn_sigs();
wbcx.visit_fru_field_types();
wbcx.visit_opaque_types(body.value.span);
wbcx.visit_cast_types();
wbcx.visit_free_region_map();
wbcx.visit_user_provided_tys();
let used_trait_imports = mem::replace(
&mut self.tables.borrow_mut().used_trait_imports,
Lrc::new(DefIdSet()),
);
debug!(
"used_trait_imports({:?}) = {:?}",
item_def_id, used_trait_imports
);
wbcx.tables.used_trait_imports = used_trait_imports;
wbcx.tables.tainted_by_errors = self.is_tainted_by_errors();
debug!(
"writeback: tables for {:?} are {:#?}",
item_def_id, wbcx.tables
);
self.tcx.alloc_tables(wbcx.tables)
}
}
struct WritebackCx<'cx, 'gcx: 'cx + 'tcx, 'tcx: 'cx> {
fcx: &'cx FnCtxt<'cx, 'gcx, 'tcx>,
tables: ty::TypeckTables<'gcx>,
body: &'gcx hir::Body,
rustc_dump_user_substs: bool,
}
impl<'cx, 'gcx, 'tcx> WritebackCx<'cx, 'gcx, 'tcx> {
fn new(
fcx: &'cx FnCtxt<'cx, 'gcx, 'tcx>,
body: &'gcx hir::Body,
rustc_dump_user_substs: bool,
) -> WritebackCx<'cx, 'gcx, 'tcx> {
let owner = fcx.tcx.hir.definitions().node_to_hir_id(body.id().node_id);
WritebackCx {
fcx,
tables: ty::TypeckTables::empty(Some(DefId::local(owner.owner))),
body,
rustc_dump_user_substs,
}
}
fn tcx(&self) -> TyCtxt<'cx, 'gcx, 'tcx> {
self.fcx.tcx
}
fn write_ty_to_tables(&mut self, hir_id: hir::HirId, ty: Ty<'gcx>) {
debug!("write_ty_to_tables({:?}, {:?})", hir_id, ty);
assert!(!ty.needs_infer() && !ty.has_skol());
self.tables.node_types_mut().insert(hir_id, ty);
}
fn fix_scalar_builtin_expr(&mut self, e: &hir::Expr) {
match e.node {
hir::ExprKind::Unary(hir::UnNeg, ref inner)
| hir::ExprKind::Unary(hir::UnNot, ref inner) => {
let inner_ty = self.fcx.node_ty(inner.hir_id);
let inner_ty = self.fcx.resolve_type_vars_if_possible(&inner_ty);
if inner_ty.is_scalar() {
let mut tables = self.fcx.tables.borrow_mut();
tables.type_dependent_defs_mut().remove(e.hir_id);
tables.node_substs_mut().remove(e.hir_id);
}
}
hir::ExprKind::Binary(ref op, ref lhs, ref rhs)
| hir::ExprKind::AssignOp(ref op, ref lhs, ref rhs) => {
let lhs_ty = self.fcx.node_ty(lhs.hir_id);
let lhs_ty = self.fcx.resolve_type_vars_if_possible(&lhs_ty);
let rhs_ty = self.fcx.node_ty(rhs.hir_id);
let rhs_ty = self.fcx.resolve_type_vars_if_possible(&rhs_ty);
if lhs_ty.is_scalar() && rhs_ty.is_scalar() {
let mut tables = self.fcx.tables.borrow_mut();
tables.type_dependent_defs_mut().remove(e.hir_id);
tables.node_substs_mut().remove(e.hir_id);
match e.node {
hir::ExprKind::Binary(..) => {
if !op.node.is_by_value() {
let mut adjustments = tables.adjustments_mut();
adjustments.get_mut(lhs.hir_id).map(|a| a.pop());
adjustments.get_mut(rhs.hir_id).map(|a| a.pop());
}
}
hir::ExprKind::AssignOp(..) => {
tables
.adjustments_mut()
.get_mut(lhs.hir_id)
.map(|a| a.pop());
}
_ => {}
}
}
}
_ => {}
}
}
fn fix_index_builtin_expr(&mut self, e: &hir::Expr) {
if let hir::ExprKind::Index(ref base, ref index) = e.node {
let mut tables = self.fcx.tables.borrow_mut();
match tables.expr_ty_adjusted(&base).sty {
ty::Ref(_, base_ty, _) => {
let index_ty = tables.expr_ty_adjusted(&index);
let index_ty = self.fcx.resolve_type_vars_if_possible(&index_ty);
if base_ty.builtin_index().is_some() && index_ty == self.fcx.tcx.types.usize {
tables.type_dependent_defs_mut().remove(e.hir_id);
tables.node_substs_mut().remove(e.hir_id);
tables.adjustments_mut().get_mut(base.hir_id).map(|a| {
match a.pop() {
Some(Adjustment {
kind: Adjust::Unsize,
..
}) => {
a.pop();
}
_ => {}
}
});
}
}
_ => {}
}
}
}
}
impl<'cx, 'gcx, 'tcx> Visitor<'gcx> for WritebackCx<'cx, 'gcx, 'tcx> {
fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'gcx> {
NestedVisitorMap::None
}
fn visit_expr(&mut self, e: &'gcx hir::Expr) {
self.fix_scalar_builtin_expr(e);
self.fix_index_builtin_expr(e);
self.visit_node_id(e.span, e.hir_id);
match e.node {
hir::ExprKind::Closure(_, _, body, _, _) => {
let body = self.fcx.tcx.hir.body(body);
for arg in &body.arguments {
self.visit_node_id(e.span, arg.hir_id);
}
self.visit_body(body);
}
hir::ExprKind::Struct(_, ref fields, _) => {
for field in fields {
self.visit_field_id(field.id);
}
}
hir::ExprKind::Field(..) => {
self.visit_field_id(e.id);
}
_ => {}
}
intravisit::walk_expr(self, e);
}
fn visit_block(&mut self, b: &'gcx hir::Block) {
self.visit_node_id(b.span, b.hir_id);
intravisit::walk_block(self, b);
}
fn visit_pat(&mut self, p: &'gcx hir::Pat) {
match p.node {
hir::PatKind::Binding(..) => {
if let Some(&bm) = self.fcx.tables.borrow().pat_binding_modes().get(p.hir_id) {
self.tables.pat_binding_modes_mut().insert(p.hir_id, bm);
} else {
self.tcx()
.sess
.delay_span_bug(p.span, "missing binding mode");
}
}
hir::PatKind::Struct(_, ref fields, _) => {
for field in fields {
self.visit_field_id(field.node.id);
}
}
_ => {}
};
self.visit_pat_adjustments(p.span, p.hir_id);
self.visit_node_id(p.span, p.hir_id);
intravisit::walk_pat(self, p);
}
fn visit_local(&mut self, l: &'gcx hir::Local) {
intravisit::walk_local(self, l);
let var_ty = self.fcx.local_ty(l.span, l.id);
let var_ty = self.resolve(&var_ty, &l.span);
self.write_ty_to_tables(l.hir_id, var_ty);
}
fn visit_ty(&mut self, hir_ty: &'gcx hir::Ty) {
intravisit::walk_ty(self, hir_ty);
let ty = self.fcx.node_ty(hir_ty.hir_id);
let ty = self.resolve(&ty, &hir_ty.span);
self.write_ty_to_tables(hir_ty.hir_id, ty);
}
}
impl<'cx, 'gcx, 'tcx> WritebackCx<'cx, 'gcx, 'tcx> {
fn visit_upvar_borrow_map(&mut self) {
for (upvar_id, upvar_capture) in self.fcx.tables.borrow().upvar_capture_map.iter() {
let new_upvar_capture = match *upvar_capture {
ty::UpvarCapture::ByValue => ty::UpvarCapture::ByValue,
ty::UpvarCapture::ByRef(ref upvar_borrow) => {
let r = upvar_borrow.region;
let r = self.resolve(&r, &upvar_id.var_id);
ty::UpvarCapture::ByRef(ty::UpvarBorrow {
kind: upvar_borrow.kind,
region: r,
})
}
};
debug!(
"Upvar capture for {:?} resolved to {:?}",
upvar_id, new_upvar_capture
);
self.tables
.upvar_capture_map
.insert(*upvar_id, new_upvar_capture);
}
}
fn visit_closures(&mut self) {
let fcx_tables = self.fcx.tables.borrow();
debug_assert_eq!(fcx_tables.local_id_root, self.tables.local_id_root);
let common_local_id_root = fcx_tables.local_id_root.unwrap();
for (&id, &origin) in fcx_tables.closure_kind_origins().iter() {
let hir_id = hir::HirId {
owner: common_local_id_root.index,
local_id: id,
};
self.tables
.closure_kind_origins_mut()
.insert(hir_id, origin);
}
}
fn visit_cast_types(&mut self) {
let fcx_tables = self.fcx.tables.borrow();
let fcx_cast_kinds = fcx_tables.cast_kinds();
debug_assert_eq!(fcx_tables.local_id_root, self.tables.local_id_root);
let mut self_cast_kinds = self.tables.cast_kinds_mut();
let common_local_id_root = fcx_tables.local_id_root.unwrap();
for (&local_id, &cast_kind) in fcx_cast_kinds.iter() {
let hir_id = hir::HirId {
owner: common_local_id_root.index,
local_id,
};
self_cast_kinds.insert(hir_id, cast_kind);
}
}
fn visit_free_region_map(&mut self) {
let free_region_map = self.tcx()
.lift_to_global(&self.fcx.tables.borrow().free_region_map);
let free_region_map = free_region_map.expect("all regions in free-region-map are global");
self.tables.free_region_map = free_region_map;
}
fn visit_user_provided_tys(&mut self) {
let fcx_tables = self.fcx.tables.borrow();
debug_assert_eq!(fcx_tables.local_id_root, self.tables.local_id_root);
let common_local_id_root = fcx_tables.local_id_root.unwrap();
for (&local_id, c_ty) in fcx_tables.user_provided_tys().iter() {
let hir_id = hir::HirId {
owner: common_local_id_root.index,
local_id,
};
let c_ty = if let Some(c_ty) = self.tcx().lift_to_global(c_ty) {
c_ty
} else {
span_bug!(
hir_id.to_span(&self.fcx.tcx),
"writeback: `{:?}` missing from the global type context",
c_ty
);
};
self.tables
.user_provided_tys_mut()
.insert(hir_id, c_ty.clone());
}
}
fn visit_opaque_types(&mut self, span: Span) {
for (&def_id, opaque_defn) in self.fcx.opaque_types.borrow().iter() {
let node_id = self.tcx().hir.as_local_node_id(def_id).unwrap();
let instantiated_ty = self.resolve(&opaque_defn.concrete_ty, &node_id);
let generics = self.tcx().generics_of(def_id);
let definition_ty = if generics.parent.is_some() {
self.fcx.infer_opaque_definition_from_instantiation(
def_id,
opaque_defn,
instantiated_ty,
)
} else {
instantiated_ty.fold_with(&mut BottomUpFolder {
tcx: self.tcx().global_tcx(),
fldop: |ty| {
trace!("checking type {:?}: {:#?}", ty, ty.sty);
if let ty::Param(..) = ty.sty {
assert_eq!(opaque_defn.substs.len(), generics.params.len());
for (subst, param) in opaque_defn.substs.iter().zip(&generics.params) {
if let UnpackedKind::Type(subst) = subst.unpack() {
if subst == ty {
return self.tcx()
.global_tcx()
.mk_ty_param(param.index, param.name);
}
}
}
self.tcx()
.sess
.struct_span_err(
span,
&format!(
"type parameter `{}` is part of concrete type but not used \
in parameter list for existential type",
ty,
),
)
.emit();
return self.tcx().types.err;
}
ty
},
reg_op: |region| {
match region {
ty::ReStatic => region,
_ => {
trace!("checking {:?}", region);
for (subst, p) in opaque_defn.substs.iter().zip(&generics.params) {
if let UnpackedKind::Lifetime(subst) = subst.unpack() {
if subst == region {
let reg = ty::EarlyBoundRegion {
def_id: p.def_id,
index: p.index,
name: p.name,
};
trace!("replace {:?} with {:?}", region, reg);
return self.tcx()
.global_tcx()
.mk_region(ty::ReEarlyBound(reg));
}
}
}
trace!("opaque_defn: {:#?}", opaque_defn);
trace!("generics: {:#?}", generics);
self.tcx()
.sess
.struct_span_err(
span,
"non-defining existential type use in defining scope",
)
.span_label(
span,
format!(
"lifetime `{}` is part of concrete type but not used \
in parameter list of existential type",
region,
),
)
.emit();
self.tcx().global_tcx().mk_region(ty::ReStatic)
}
}
},
})
};
if let ty::Opaque(defin_ty_def_id, _substs) = definition_ty.sty {
if def_id == defin_ty_def_id {
self.tcx().at(span).type_of(defin_ty_def_id);
}
}
let old = self.tables
.concrete_existential_types
.insert(def_id, definition_ty);
if let Some(old) = old {
if old != definition_ty {
span_bug!(
span,
"visit_opaque_types tried to write \
different types for the same existential type: {:?}, {:?}, {:?}",
def_id,
definition_ty,
old,
);
}
}
}
}
fn visit_field_id(&mut self, node_id: ast::NodeId) {
let hir_id = self.tcx().hir.node_to_hir_id(node_id);
if let Some(index) = self.fcx
.tables
.borrow_mut()
.field_indices_mut()
.remove(hir_id)
{
self.tables.field_indices_mut().insert(hir_id, index);
}
}
fn visit_node_id(&mut self, span: Span, hir_id: hir::HirId) {
if let Some(def) = self.fcx
.tables
.borrow_mut()
.type_dependent_defs_mut()
.remove(hir_id)
{
self.tables.type_dependent_defs_mut().insert(hir_id, def);
}
self.visit_adjustments(span, hir_id);
let n_ty = self.fcx.node_ty(hir_id);
let n_ty = self.resolve(&n_ty, &span);
self.write_ty_to_tables(hir_id, n_ty);
debug!("Node {:?} has type {:?}", hir_id, n_ty);
if let Some(substs) = self.fcx.tables.borrow().node_substs_opt(hir_id) {
let substs = self.resolve(&substs, &span);
debug!("write_substs_to_tcx({:?}, {:?})", hir_id, substs);
assert!(!substs.needs_infer() && !substs.has_skol());
self.tables.node_substs_mut().insert(hir_id, substs);
}
if let Some(user_substs) = self.fcx.tables.borrow().user_substs(hir_id) {
let user_substs = self.tcx().lift_to_global(&user_substs).unwrap();
self.tables.user_substs_mut().insert(hir_id, user_substs);
if self.rustc_dump_user_substs {
let node_id = self.tcx().hir.hir_to_node_id(hir_id);
let span = self.tcx().hir.span(node_id);
self.tcx().sess.span_err(
span,
&format!("user substs: {:?}", user_substs),
);
}
}
}
fn visit_adjustments(&mut self, span: Span, hir_id: hir::HirId) {
let adjustment = self.fcx
.tables
.borrow_mut()
.adjustments_mut()
.remove(hir_id);
match adjustment {
None => {
debug!("No adjustments for node {:?}", hir_id);
}
Some(adjustment) => {
let resolved_adjustment = self.resolve(&adjustment, &span);
debug!(
"Adjustments for node {:?}: {:?}",
hir_id, resolved_adjustment
);
self.tables
.adjustments_mut()
.insert(hir_id, resolved_adjustment);
}
}
}
fn visit_pat_adjustments(&mut self, span: Span, hir_id: hir::HirId) {
let adjustment = self.fcx
.tables
.borrow_mut()
.pat_adjustments_mut()
.remove(hir_id);
match adjustment {
None => {
debug!("No pat_adjustments for node {:?}", hir_id);
}
Some(adjustment) => {
let resolved_adjustment = self.resolve(&adjustment, &span);
debug!(
"pat_adjustments for node {:?}: {:?}",
hir_id, resolved_adjustment
);
self.tables
.pat_adjustments_mut()
.insert(hir_id, resolved_adjustment);
}
}
}
fn visit_liberated_fn_sigs(&mut self) {
let fcx_tables = self.fcx.tables.borrow();
debug_assert_eq!(fcx_tables.local_id_root, self.tables.local_id_root);
let common_local_id_root = fcx_tables.local_id_root.unwrap();
for (&local_id, fn_sig) in fcx_tables.liberated_fn_sigs().iter() {
let hir_id = hir::HirId {
owner: common_local_id_root.index,
local_id,
};
let fn_sig = self.resolve(fn_sig, &hir_id);
self.tables
.liberated_fn_sigs_mut()
.insert(hir_id, fn_sig.clone());
}
}
fn visit_fru_field_types(&mut self) {
let fcx_tables = self.fcx.tables.borrow();
debug_assert_eq!(fcx_tables.local_id_root, self.tables.local_id_root);
let common_local_id_root = fcx_tables.local_id_root.unwrap();
for (&local_id, ftys) in fcx_tables.fru_field_types().iter() {
let hir_id = hir::HirId {
owner: common_local_id_root.index,
local_id,
};
let ftys = self.resolve(ftys, &hir_id);
self.tables.fru_field_types_mut().insert(hir_id, ftys);
}
}
fn resolve<T>(&self, x: &T, span: &dyn Locatable) -> T::Lifted
where
T: TypeFoldable<'tcx> + ty::Lift<'gcx>,
{
let x = x.fold_with(&mut Resolver::new(self.fcx, span, self.body));
if let Some(lifted) = self.tcx().lift_to_global(&x) {
lifted
} else {
span_bug!(
span.to_span(&self.fcx.tcx),
"writeback: `{:?}` missing from the global type context",
x
);
}
}
}
trait Locatable {
fn to_span(&self, tcx: &TyCtxt) -> Span;
}
impl Locatable for Span {
fn to_span(&self, _: &TyCtxt) -> Span {
*self
}
}
impl Locatable for ast::NodeId {
fn to_span(&self, tcx: &TyCtxt) -> Span {
tcx.hir.span(*self)
}
}
impl Locatable for DefIndex {
fn to_span(&self, tcx: &TyCtxt) -> Span {
let node_id = tcx.hir.def_index_to_node_id(*self);
tcx.hir.span(node_id)
}
}
impl Locatable for hir::HirId {
fn to_span(&self, tcx: &TyCtxt) -> Span {
let node_id = tcx.hir.hir_to_node_id(*self);
tcx.hir.span(node_id)
}
}
struct Resolver<'cx, 'gcx: 'cx + 'tcx, 'tcx: 'cx> {
tcx: TyCtxt<'cx, 'gcx, 'tcx>,
infcx: &'cx InferCtxt<'cx, 'gcx, 'tcx>,
span: &'cx dyn Locatable,
body: &'gcx hir::Body,
}
impl<'cx, 'gcx, 'tcx> Resolver<'cx, 'gcx, 'tcx> {
fn new(
fcx: &'cx FnCtxt<'cx, 'gcx, 'tcx>,
span: &'cx dyn Locatable,
body: &'gcx hir::Body,
) -> Resolver<'cx, 'gcx, 'tcx> {
Resolver {
tcx: fcx.tcx,
infcx: fcx,
span,
body,
}
}
fn report_error(&self, t: Ty<'tcx>) {
if !self.tcx.sess.has_errors() {
self.infcx
.need_type_info_err(Some(self.body.id()), self.span.to_span(&self.tcx), t)
.emit();
}
}
}
impl<'cx, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for Resolver<'cx, 'gcx, 'tcx> {
fn tcx<'a>(&'a self) -> TyCtxt<'a, 'gcx, 'tcx> {
self.tcx
}
fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> {
match self.infcx.fully_resolve(&t) {
Ok(t) => t,
Err(_) => {
debug!(
"Resolver::fold_ty: input type `{:?}` not fully resolvable",
t
);
self.report_error(t);
self.tcx().types.err
}
}
}
fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
match self.infcx.fully_resolve(&r) {
Ok(r) => r,
Err(_) => self.tcx.types.re_static,
}
}
}