-use crate::thir::cx::block;
-use crate::thir::cx::to_ref::ToRef;
use crate::thir::cx::Cx;
use crate::thir::util::UserAnnotatedTyHelpers;
use crate::thir::*;
+use rustc_data_structures::stack::ensure_sufficient_stack;
use rustc_hir as hir;
use rustc_hir::def::{CtorKind, CtorOf, DefKind, Res};
use rustc_index::vec::Idx;
+use rustc_middle::hir::place::Place as HirPlace;
use rustc_middle::hir::place::PlaceBase as HirPlaceBase;
use rustc_middle::hir::place::ProjectionKind as HirProjectionKind;
use rustc_middle::mir::interpret::Scalar;
use rustc_middle::ty::{self, AdtKind, Ty};
use rustc_span::Span;
-impl<'tcx> Mirror<'tcx> for &'tcx hir::Expr<'tcx> {
- type Output = Expr<'tcx>;
+use std::iter;
- fn make_mirror(self, cx: &mut Cx<'_, 'tcx>) -> Expr<'tcx> {
- let temp_lifetime = cx.region_scope_tree.temporary_scope(self.hir_id.local_id);
- let expr_scope = region::Scope { id: self.hir_id.local_id, data: region::ScopeData::Node };
+impl<'thir, 'tcx> Cx<'thir, 'tcx> {
+ /// Mirrors and allocates a single [`hir::Expr`]. If you need to mirror a whole slice
+ /// of expressions, prefer using [`mirror_exprs`].
+ ///
+ /// [`mirror_exprs`]: Self::mirror_exprs
+ crate fn mirror_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) -> &'thir Expr<'thir, 'tcx> {
+ // `mirror_expr` is recursing very deep. Make sure the stack doesn't overflow.
+ ensure_sufficient_stack(|| self.arena.alloc(self.mirror_expr_inner(expr)))
+ }
+
+ /// Mirrors and allocates a slice of [`hir::Expr`]s. They will be allocated as a
+ /// contiguous sequence in memory.
+ crate fn mirror_exprs(&mut self, exprs: &'tcx [hir::Expr<'tcx>]) -> &'thir [Expr<'thir, 'tcx>] {
+ self.arena.alloc_from_iter(exprs.iter().map(|expr| self.mirror_expr_inner(expr)))
+ }
- debug!("Expr::make_mirror(): id={}, span={:?}", self.hir_id, self.span);
+ /// Mirrors a [`hir::Expr`] without allocating it into the arena.
+ /// This is a separate, private function so that [`mirror_expr`] and [`mirror_exprs`] can
+ /// decide how to allocate this expression (alone or within a slice).
+ ///
+ /// [`mirror_expr`]: Self::mirror_expr
+ /// [`mirror_exprs`]: Self::mirror_exprs
+ pub(super) fn mirror_expr_inner(
+ &mut self,
+ hir_expr: &'tcx hir::Expr<'tcx>,
+ ) -> Expr<'thir, 'tcx> {
+ let temp_lifetime = self.region_scope_tree.temporary_scope(hir_expr.hir_id.local_id);
+ let expr_scope =
+ region::Scope { id: hir_expr.hir_id.local_id, data: region::ScopeData::Node };
- let mut expr = make_mirror_unadjusted(cx, self);
+ debug!("Expr::make_mirror(): id={}, span={:?}", hir_expr.hir_id, hir_expr.span);
+
+ let mut expr = self.make_mirror_unadjusted(hir_expr);
// Now apply adjustments, if any.
- for adjustment in cx.typeck_results().expr_adjustments(self) {
+ for adjustment in self.typeck_results.expr_adjustments(hir_expr) {
debug!("make_mirror: expr={:?} applying adjustment={:?}", expr, adjustment);
- expr = apply_adjustment(cx, self, expr, adjustment);
+ expr = self.apply_adjustment(hir_expr, expr, adjustment);
}
// Next, wrap this up in the expr's scope.
expr = Expr {
temp_lifetime,
ty: expr.ty,
- span: self.span,
+ span: hir_expr.span,
kind: ExprKind::Scope {
region_scope: expr_scope,
- value: expr.to_ref(),
- lint_level: LintLevel::Explicit(self.hir_id),
+ value: self.arena.alloc(expr),
+ lint_level: LintLevel::Explicit(hir_expr.hir_id),
},
};
// Finally, create a destruction scope, if any.
- if let Some(region_scope) = cx.region_scope_tree.opt_destruction_scope(self.hir_id.local_id)
+ if let Some(region_scope) =
+ self.region_scope_tree.opt_destruction_scope(hir_expr.hir_id.local_id)
{
expr = Expr {
temp_lifetime,
ty: expr.ty,
- span: self.span,
+ span: hir_expr.span,
kind: ExprKind::Scope {
region_scope,
- value: expr.to_ref(),
+ value: self.arena.alloc(expr),
lint_level: LintLevel::Inherited,
},
};
// OK, all done!
expr
}
-}
-fn apply_adjustment<'a, 'tcx>(
- cx: &mut Cx<'a, 'tcx>,
- hir_expr: &'tcx hir::Expr<'tcx>,
- mut expr: Expr<'tcx>,
- adjustment: &Adjustment<'tcx>,
-) -> Expr<'tcx> {
- let Expr { temp_lifetime, mut span, .. } = expr;
-
- // Adjust the span from the block, to the last expression of the
- // block. This is a better span when returning a mutable reference
- // with too short a lifetime. The error message will use the span
- // from the assignment to the return place, which should only point
- // at the returned value, not the entire function body.
- //
- // fn return_short_lived<'a>(x: &'a mut i32) -> &'static mut i32 {
- // x
- // // ^ error message points at this expression.
- // }
- let mut adjust_span = |expr: &mut Expr<'tcx>| {
- if let ExprKind::Block { body } = expr.kind {
- if let Some(ref last_expr) = body.expr {
- span = last_expr.span;
- expr.span = span;
+ fn apply_adjustment(
+ &mut self,
+ hir_expr: &'tcx hir::Expr<'tcx>,
+ mut expr: Expr<'thir, 'tcx>,
+ adjustment: &Adjustment<'tcx>,
+ ) -> Expr<'thir, 'tcx> {
+ let Expr { temp_lifetime, mut span, .. } = expr;
+
+ // Adjust the span from the block, to the last expression of the
+ // block. This is a better span when returning a mutable reference
+ // with too short a lifetime. The error message will use the span
+ // from the assignment to the return place, which should only point
+ // at the returned value, not the entire function body.
+ //
+ // fn return_short_lived<'a>(x: &'a mut i32) -> &'static mut i32 {
+ // x
+ // // ^ error message points at this expression.
+ // }
+ let mut adjust_span = |expr: &mut Expr<'thir, 'tcx>| {
+ if let ExprKind::Block { body } = &expr.kind {
+ if let Some(ref last_expr) = body.expr {
+ span = last_expr.span;
+ expr.span = span;
+ }
}
- }
- };
+ };
- let kind = match adjustment.kind {
- Adjust::Pointer(PointerCast::Unsize) => {
- adjust_span(&mut expr);
- ExprKind::Pointer { cast: PointerCast::Unsize, source: expr.to_ref() }
- }
- Adjust::Pointer(cast) => ExprKind::Pointer { cast, source: expr.to_ref() },
- Adjust::NeverToAny => ExprKind::NeverToAny { source: expr.to_ref() },
- Adjust::Deref(None) => {
- adjust_span(&mut expr);
- ExprKind::Deref { arg: expr.to_ref() }
- }
- Adjust::Deref(Some(deref)) => {
- // We don't need to do call adjust_span here since
- // deref coercions always start with a built-in deref.
- let call = deref.method_call(cx.tcx(), expr.ty);
+ let kind = match adjustment.kind {
+ Adjust::Pointer(PointerCast::Unsize) => {
+ adjust_span(&mut expr);
+ ExprKind::Pointer { cast: PointerCast::Unsize, source: self.arena.alloc(expr) }
+ }
+ Adjust::Pointer(cast) => ExprKind::Pointer { cast, source: self.arena.alloc(expr) },
+ Adjust::NeverToAny => ExprKind::NeverToAny { source: self.arena.alloc(expr) },
+ Adjust::Deref(None) => {
+ adjust_span(&mut expr);
+ ExprKind::Deref { arg: self.arena.alloc(expr) }
+ }
+ Adjust::Deref(Some(deref)) => {
+ // We don't need to do call adjust_span here since
+ // deref coercions always start with a built-in deref.
+ let call = deref.method_call(self.tcx(), expr.ty);
- expr = Expr {
- temp_lifetime,
- ty: cx.tcx.mk_ref(deref.region, ty::TypeAndMut { ty: expr.ty, mutbl: deref.mutbl }),
- span,
- kind: ExprKind::Borrow {
- borrow_kind: deref.mutbl.to_borrow_kind(),
- arg: expr.to_ref(),
- },
- };
+ expr = Expr {
+ temp_lifetime,
+ ty: self
+ .tcx
+ .mk_ref(deref.region, ty::TypeAndMut { ty: expr.ty, mutbl: deref.mutbl }),
+ span,
+ kind: ExprKind::Borrow {
+ borrow_kind: deref.mutbl.to_borrow_kind(),
+ arg: self.arena.alloc(expr),
+ },
+ };
- overloaded_place(
- cx,
- hir_expr,
- adjustment.target,
- Some(call),
- vec![expr.to_ref()],
- deref.span,
- )
- }
- Adjust::Borrow(AutoBorrow::Ref(_, m)) => {
- ExprKind::Borrow { borrow_kind: m.to_borrow_kind(), arg: expr.to_ref() }
- }
- Adjust::Borrow(AutoBorrow::RawPtr(mutability)) => {
- ExprKind::AddressOf { mutability, arg: expr.to_ref() }
- }
- };
+ self.overloaded_place(
+ hir_expr,
+ adjustment.target,
+ Some(call),
+ self.arena.alloc_from_iter(iter::once(expr)),
+ deref.span,
+ )
+ }
+ Adjust::Borrow(AutoBorrow::Ref(_, m)) => {
+ ExprKind::Borrow { borrow_kind: m.to_borrow_kind(), arg: self.arena.alloc(expr) }
+ }
+ Adjust::Borrow(AutoBorrow::RawPtr(mutability)) => {
+ ExprKind::AddressOf { mutability, arg: self.arena.alloc(expr) }
+ }
+ };
- Expr { temp_lifetime, ty: adjustment.target, span, kind }
-}
+ Expr { temp_lifetime, ty: adjustment.target, span, kind }
+ }
-fn make_mirror_unadjusted<'a, 'tcx>(
- cx: &mut Cx<'a, 'tcx>,
- expr: &'tcx hir::Expr<'tcx>,
-) -> Expr<'tcx> {
- let expr_ty = cx.typeck_results().expr_ty(expr);
- let temp_lifetime = cx.region_scope_tree.temporary_scope(expr.hir_id.local_id);
-
- let kind = match expr.kind {
- // Here comes the interesting stuff:
- hir::ExprKind::MethodCall(_, method_span, ref args, fn_span) => {
- // Rewrite a.b(c) into UFCS form like Trait::b(a, c)
- let expr = method_callee(cx, expr, method_span, None);
- let args = args.iter().map(|e| e.to_ref()).collect();
- ExprKind::Call { ty: expr.ty, fun: expr.to_ref(), args, from_hir_call: true, fn_span }
- }
+ fn make_mirror_unadjusted(&mut self, expr: &'tcx hir::Expr<'tcx>) -> Expr<'thir, 'tcx> {
+ let expr_ty = self.typeck_results().expr_ty(expr);
+ let temp_lifetime = self.region_scope_tree.temporary_scope(expr.hir_id.local_id);
- hir::ExprKind::Call(ref fun, ref args) => {
- if cx.typeck_results().is_method_call(expr) {
- // The callee is something implementing Fn, FnMut, or FnOnce.
- // Find the actual method implementation being called and
- // build the appropriate UFCS call expression with the
- // callee-object as expr parameter.
+ let kind = match expr.kind {
+ // Here comes the interesting stuff:
+ hir::ExprKind::MethodCall(_, method_span, ref args, fn_span) => {
+ // Rewrite a.b(c) into UFCS form like Trait::b(a, c)
+ let expr = self.method_callee(expr, method_span, None);
+ let args = self.mirror_exprs(args);
+ ExprKind::Call {
+ ty: expr.ty,
+ fun: self.arena.alloc(expr),
+ args,
+ from_hir_call: true,
+ fn_span,
+ }
+ }
- // rewrite f(u, v) into FnOnce::call_once(f, (u, v))
+ hir::ExprKind::Call(ref fun, ref args) => {
+ if self.typeck_results().is_method_call(expr) {
+ // The callee is something implementing Fn, FnMut, or FnOnce.
+ // Find the actual method implementation being called and
+ // build the appropriate UFCS call expression with the
+ // callee-object as expr parameter.
- let method = method_callee(cx, expr, fun.span, None);
+ // rewrite f(u, v) into FnOnce::call_once(f, (u, v))
- let arg_tys = args.iter().map(|e| cx.typeck_results().expr_ty_adjusted(e));
- let tupled_args = Expr {
- ty: cx.tcx.mk_tup(arg_tys),
- temp_lifetime,
- span: expr.span,
- kind: ExprKind::Tuple { fields: args.iter().map(ToRef::to_ref).collect() },
- };
+ let method = self.method_callee(expr, fun.span, None);
- ExprKind::Call {
- ty: method.ty,
- fun: method.to_ref(),
- args: vec![fun.to_ref(), tupled_args.to_ref()],
- from_hir_call: true,
- fn_span: expr.span,
- }
- } else {
- let adt_data =
- if let hir::ExprKind::Path(hir::QPath::Resolved(_, ref path)) = fun.kind {
- // Tuple-like ADTs are represented as ExprKind::Call. We convert them here.
- expr_ty.ty_adt_def().and_then(|adt_def| match path.res {
- Res::Def(DefKind::Ctor(_, CtorKind::Fn), ctor_id) => {
- Some((adt_def, adt_def.variant_index_with_ctor_id(ctor_id)))
- }
- Res::SelfCtor(..) => Some((adt_def, VariantIdx::new(0))),
- _ => None,
- })
- } else {
- None
+ let arg_tys = args.iter().map(|e| self.typeck_results().expr_ty_adjusted(e));
+ let tupled_args = Expr {
+ ty: self.tcx.mk_tup(arg_tys),
+ temp_lifetime,
+ span: expr.span,
+ kind: ExprKind::Tuple { fields: self.mirror_exprs(args) },
};
- if let Some((adt_def, index)) = adt_data {
- let substs = cx.typeck_results().node_substs(fun.hir_id);
- let user_provided_types = cx.typeck_results().user_provided_types();
- let user_ty = user_provided_types.get(fun.hir_id).copied().map(|mut u_ty| {
- if let UserType::TypeOf(ref mut did, _) = &mut u_ty.value {
- *did = adt_def.did;
- }
- u_ty
- });
- debug!("make_mirror_unadjusted: (call) user_ty={:?}", user_ty);
- let field_refs = args
- .iter()
- .enumerate()
- .map(|(idx, e)| FieldExprRef { name: Field::new(idx), expr: e.to_ref() })
- .collect();
- ExprKind::Adt {
- adt_def,
- substs,
- variant_index: index,
- fields: field_refs,
- user_ty,
- base: None,
- }
- } else {
ExprKind::Call {
- ty: cx.typeck_results().node_type(fun.hir_id),
- fun: fun.to_ref(),
- args: args.to_ref(),
+ ty: method.ty,
+ fun: self.arena.alloc(method),
+ args: self
+ .arena
+ .alloc_from_iter(vec![self.mirror_expr_inner(fun), tupled_args]),
from_hir_call: true,
fn_span: expr.span,
}
+ } else {
+ let adt_data =
+ if let hir::ExprKind::Path(hir::QPath::Resolved(_, ref path)) = fun.kind {
+ // Tuple-like ADTs are represented as ExprKind::Call. We convert them here.
+ expr_ty.ty_adt_def().and_then(|adt_def| match path.res {
+ Res::Def(DefKind::Ctor(_, CtorKind::Fn), ctor_id) => {
+ Some((adt_def, adt_def.variant_index_with_ctor_id(ctor_id)))
+ }
+ Res::SelfCtor(..) => Some((adt_def, VariantIdx::new(0))),
+ _ => None,
+ })
+ } else {
+ None
+ };
+ if let Some((adt_def, index)) = adt_data {
+ let substs = self.typeck_results().node_substs(fun.hir_id);
+ let user_provided_types = self.typeck_results().user_provided_types();
+ let user_ty =
+ user_provided_types.get(fun.hir_id).copied().map(|mut u_ty| {
+ if let UserType::TypeOf(ref mut did, _) = &mut u_ty.value {
+ *did = adt_def.did;
+ }
+ u_ty
+ });
+ debug!("make_mirror_unadjusted: (call) user_ty={:?}", user_ty);
+
+ let field_refs =
+ self.arena.alloc_from_iter(args.iter().enumerate().map(|(idx, e)| {
+ FieldExpr { name: Field::new(idx), expr: self.mirror_expr(e) }
+ }));
+ ExprKind::Adt {
+ adt_def,
+ substs,
+ variant_index: index,
+ fields: field_refs,
+ user_ty,
+ base: None,
+ }
+ } else {
+ ExprKind::Call {
+ ty: self.typeck_results().node_type(fun.hir_id),
+ fun: self.mirror_expr(fun),
+ args: self.mirror_exprs(args),
+ from_hir_call: true,
+ fn_span: expr.span,
+ }
+ }
}
}
- }
- hir::ExprKind::AddrOf(hir::BorrowKind::Ref, mutbl, ref arg) => {
- ExprKind::Borrow { borrow_kind: mutbl.to_borrow_kind(), arg: arg.to_ref() }
- }
+ hir::ExprKind::AddrOf(hir::BorrowKind::Ref, mutbl, ref arg) => {
+ ExprKind::Borrow { borrow_kind: mutbl.to_borrow_kind(), arg: self.mirror_expr(arg) }
+ }
- hir::ExprKind::AddrOf(hir::BorrowKind::Raw, mutability, ref arg) => {
- ExprKind::AddressOf { mutability, arg: arg.to_ref() }
- }
+ hir::ExprKind::AddrOf(hir::BorrowKind::Raw, mutability, ref arg) => {
+ ExprKind::AddressOf { mutability, arg: self.mirror_expr(arg) }
+ }
- hir::ExprKind::Block(ref blk, _) => ExprKind::Block { body: &blk },
+ hir::ExprKind::Block(ref blk, _) => ExprKind::Block { body: self.mirror_block(blk) },
- hir::ExprKind::Assign(ref lhs, ref rhs, _) => {
- ExprKind::Assign { lhs: lhs.to_ref(), rhs: rhs.to_ref() }
- }
+ hir::ExprKind::Assign(ref lhs, ref rhs, _) => {
+ ExprKind::Assign { lhs: self.mirror_expr(lhs), rhs: self.mirror_expr(rhs) }
+ }
- hir::ExprKind::AssignOp(op, ref lhs, ref rhs) => {
- if cx.typeck_results().is_method_call(expr) {
- overloaded_operator(cx, expr, vec![lhs.to_ref(), rhs.to_ref()])
- } else {
- ExprKind::AssignOp { op: bin_op(op.node), lhs: lhs.to_ref(), rhs: rhs.to_ref() }
+ hir::ExprKind::AssignOp(op, ref lhs, ref rhs) => {
+ if self.typeck_results().is_method_call(expr) {
+ let lhs = self.mirror_expr_inner(lhs);
+ let rhs = self.mirror_expr_inner(rhs);
+ self.overloaded_operator(expr, self.arena.alloc_from_iter(vec![lhs, rhs]))
+ } else {
+ ExprKind::AssignOp {
+ op: bin_op(op.node),
+ lhs: self.mirror_expr(lhs),
+ rhs: self.mirror_expr(rhs),
+ }
+ }
}
- }
- hir::ExprKind::Lit(ref lit) => ExprKind::Literal {
- literal: cx.const_eval_literal(&lit.node, expr_ty, lit.span, false),
- user_ty: None,
- const_id: None,
- },
-
- hir::ExprKind::Binary(op, ref lhs, ref rhs) => {
- if cx.typeck_results().is_method_call(expr) {
- overloaded_operator(cx, expr, vec![lhs.to_ref(), rhs.to_ref()])
- } else {
- // FIXME overflow
- match (op.node, cx.constness) {
- (hir::BinOpKind::And, _) => ExprKind::LogicalOp {
- op: LogicalOp::And,
- lhs: lhs.to_ref(),
- rhs: rhs.to_ref(),
- },
- (hir::BinOpKind::Or, _) => ExprKind::LogicalOp {
- op: LogicalOp::Or,
- lhs: lhs.to_ref(),
- rhs: rhs.to_ref(),
- },
+ hir::ExprKind::Lit(ref lit) => ExprKind::Literal {
+ literal: self.const_eval_literal(&lit.node, expr_ty, lit.span, false),
+ user_ty: None,
+ const_id: None,
+ },
- _ => {
- let op = bin_op(op.node);
- ExprKind::Binary { op, lhs: lhs.to_ref(), rhs: rhs.to_ref() }
+ hir::ExprKind::Binary(op, ref lhs, ref rhs) => {
+ if self.typeck_results().is_method_call(expr) {
+ let lhs = self.mirror_expr_inner(lhs);
+ let rhs = self.mirror_expr_inner(rhs);
+ self.overloaded_operator(expr, self.arena.alloc_from_iter(vec![lhs, rhs]))
+ } else {
+ // FIXME overflow
+ match op.node {
+ hir::BinOpKind::And => ExprKind::LogicalOp {
+ op: LogicalOp::And,
+ lhs: self.mirror_expr(lhs),
+ rhs: self.mirror_expr(rhs),
+ },
+ hir::BinOpKind::Or => ExprKind::LogicalOp {
+ op: LogicalOp::Or,
+ lhs: self.mirror_expr(lhs),
+ rhs: self.mirror_expr(rhs),
+ },
+
+ _ => {
+ let op = bin_op(op.node);
+ ExprKind::Binary {
+ op,
+ lhs: self.mirror_expr(lhs),
+ rhs: self.mirror_expr(rhs),
+ }
+ }
}
}
}
- }
- hir::ExprKind::Index(ref lhs, ref index) => {
- if cx.typeck_results().is_method_call(expr) {
- overloaded_place(
- cx,
- expr,
- expr_ty,
- None,
- vec![lhs.to_ref(), index.to_ref()],
- expr.span,
- )
- } else {
- ExprKind::Index { lhs: lhs.to_ref(), index: index.to_ref() }
+ hir::ExprKind::Index(ref lhs, ref index) => {
+ if self.typeck_results().is_method_call(expr) {
+ let lhs = self.mirror_expr_inner(lhs);
+ let index = self.mirror_expr_inner(index);
+ self.overloaded_place(
+ expr,
+ expr_ty,
+ None,
+ self.arena.alloc_from_iter(vec![lhs, index]),
+ expr.span,
+ )
+ } else {
+ ExprKind::Index { lhs: self.mirror_expr(lhs), index: self.mirror_expr(index) }
+ }
}
- }
- hir::ExprKind::Unary(hir::UnOp::UnDeref, ref arg) => {
- if cx.typeck_results().is_method_call(expr) {
- overloaded_place(cx, expr, expr_ty, None, vec![arg.to_ref()], expr.span)
- } else {
- ExprKind::Deref { arg: arg.to_ref() }
+ hir::ExprKind::Unary(hir::UnOp::Deref, ref arg) => {
+ if self.typeck_results().is_method_call(expr) {
+ let arg = self.mirror_expr_inner(arg);
+ self.overloaded_place(
+ expr,
+ expr_ty,
+ None,
+ self.arena.alloc_from_iter(iter::once(arg)),
+ expr.span,
+ )
+ } else {
+ ExprKind::Deref { arg: self.mirror_expr(arg) }
+ }
}
- }
- hir::ExprKind::Unary(hir::UnOp::UnNot, ref arg) => {
- if cx.typeck_results().is_method_call(expr) {
- overloaded_operator(cx, expr, vec![arg.to_ref()])
- } else {
- ExprKind::Unary { op: UnOp::Not, arg: arg.to_ref() }
+ hir::ExprKind::Unary(hir::UnOp::Not, ref arg) => {
+ if self.typeck_results().is_method_call(expr) {
+ let arg = self.mirror_expr_inner(arg);
+ self.overloaded_operator(expr, self.arena.alloc_from_iter(iter::once(arg)))
+ } else {
+ ExprKind::Unary { op: UnOp::Not, arg: self.mirror_expr(arg) }
+ }
}
- }
- hir::ExprKind::Unary(hir::UnOp::UnNeg, ref arg) => {
- if cx.typeck_results().is_method_call(expr) {
- overloaded_operator(cx, expr, vec![arg.to_ref()])
- } else if let hir::ExprKind::Lit(ref lit) = arg.kind {
- ExprKind::Literal {
- literal: cx.const_eval_literal(&lit.node, expr_ty, lit.span, true),
- user_ty: None,
- const_id: None,
+ hir::ExprKind::Unary(hir::UnOp::Neg, ref arg) => {
+ if self.typeck_results().is_method_call(expr) {
+ let arg = self.mirror_expr_inner(arg);
+ self.overloaded_operator(expr, self.arena.alloc_from_iter(iter::once(arg)))
+ } else if let hir::ExprKind::Lit(ref lit) = arg.kind {
+ ExprKind::Literal {
+ literal: self.const_eval_literal(&lit.node, expr_ty, lit.span, true),
+ user_ty: None,
+ const_id: None,
+ }
+ } else {
+ ExprKind::Unary { op: UnOp::Neg, arg: self.mirror_expr(arg) }
}
- } else {
- ExprKind::Unary { op: UnOp::Neg, arg: arg.to_ref() }
}
- }
- hir::ExprKind::Struct(ref qpath, ref fields, ref base) => match expr_ty.kind() {
- ty::Adt(adt, substs) => match adt.adt_kind() {
- AdtKind::Struct | AdtKind::Union => {
- let user_provided_types = cx.typeck_results().user_provided_types();
- let user_ty = user_provided_types.get(expr.hir_id).copied();
- debug!("make_mirror_unadjusted: (struct/union) user_ty={:?}", user_ty);
- ExprKind::Adt {
- adt_def: adt,
- variant_index: VariantIdx::new(0),
- substs,
- user_ty,
- fields: field_refs(cx, fields),
- base: base.as_ref().map(|base| FruInfo {
- base: base.to_ref(),
- field_types: cx.typeck_results().fru_field_types()[expr.hir_id].clone(),
- }),
+ hir::ExprKind::Struct(ref qpath, ref fields, ref base) => match expr_ty.kind() {
+ ty::Adt(adt, substs) => match adt.adt_kind() {
+ AdtKind::Struct | AdtKind::Union => {
+ let user_provided_types = self.typeck_results().user_provided_types();
+ let user_ty = user_provided_types.get(expr.hir_id).copied();
+ debug!("make_mirror_unadjusted: (struct/union) user_ty={:?}", user_ty);
+ ExprKind::Adt {
+ adt_def: adt,
+ variant_index: VariantIdx::new(0),
+ substs,
+ user_ty,
+ fields: self.field_refs(fields),
+ base: base.as_ref().map(|base| FruInfo {
+ base: self.mirror_expr(base),
+ field_types: self.arena.alloc_from_iter(
+ self.typeck_results().fru_field_types()[expr.hir_id]
+ .iter()
+ .cloned(),
+ ),
+ }),
+ }
}
- }
- AdtKind::Enum => {
- let res = cx.typeck_results().qpath_res(qpath, expr.hir_id);
- match res {
- Res::Def(DefKind::Variant, variant_id) => {
- assert!(base.is_none());
-
- let index = adt.variant_index_with_id(variant_id);
- let user_provided_types = cx.typeck_results().user_provided_types();
- let user_ty = user_provided_types.get(expr.hir_id).copied();
- debug!("make_mirror_unadjusted: (variant) user_ty={:?}", user_ty);
- ExprKind::Adt {
- adt_def: adt,
- variant_index: index,
- substs,
- user_ty,
- fields: field_refs(cx, fields),
- base: None,
+ AdtKind::Enum => {
+ let res = self.typeck_results().qpath_res(qpath, expr.hir_id);
+ match res {
+ Res::Def(DefKind::Variant, variant_id) => {
+ assert!(base.is_none());
+
+ let index = adt.variant_index_with_id(variant_id);
+ let user_provided_types =
+ self.typeck_results().user_provided_types();
+ let user_ty = user_provided_types.get(expr.hir_id).copied();
+ debug!("make_mirror_unadjusted: (variant) user_ty={:?}", user_ty);
+ ExprKind::Adt {
+ adt_def: adt,
+ variant_index: index,
+ substs,
+ user_ty,
+ fields: self.field_refs(fields),
+ base: None,
+ }
+ }
+ _ => {
+ span_bug!(expr.span, "unexpected res: {:?}", res);
}
- }
- _ => {
- span_bug!(expr.span, "unexpected res: {:?}", res);
}
}
- }
- },
- _ => {
- span_bug!(expr.span, "unexpected type for struct literal: {:?}", expr_ty);
- }
- },
-
- hir::ExprKind::Closure(..) => {
- let closure_ty = cx.typeck_results().expr_ty(expr);
- let (def_id, substs, movability) = match *closure_ty.kind() {
- ty::Closure(def_id, substs) => (def_id, UpvarSubsts::Closure(substs), None),
- ty::Generator(def_id, substs, movability) => {
- (def_id, UpvarSubsts::Generator(substs), Some(movability))
- }
+ },
_ => {
- span_bug!(expr.span, "closure expr w/o closure type: {:?}", closure_ty);
+ span_bug!(expr.span, "unexpected type for struct literal: {:?}", expr_ty);
}
- };
+ },
- let upvars = cx
- .typeck_results()
- .closure_min_captures_flattened(def_id)
- .zip(substs.upvar_tys())
- .map(|(captured_place, ty)| capture_upvar(cx, expr, captured_place, ty))
- .collect();
- ExprKind::Closure { closure_id: def_id, substs, upvars, movability }
- }
+ hir::ExprKind::Closure(..) => {
+ let closure_ty = self.typeck_results().expr_ty(expr);
+ let (def_id, substs, movability) = match *closure_ty.kind() {
+ ty::Closure(def_id, substs) => (def_id, UpvarSubsts::Closure(substs), None),
+ ty::Generator(def_id, substs, movability) => {
+ (def_id, UpvarSubsts::Generator(substs), Some(movability))
+ }
+ _ => {
+ span_bug!(expr.span, "closure expr w/o closure type: {:?}", closure_ty);
+ }
+ };
- hir::ExprKind::Path(ref qpath) => {
- let res = cx.typeck_results().qpath_res(qpath, expr.hir_id);
- convert_path_expr(cx, expr, res)
- }
+ let upvars = self.arena.alloc_from_iter(
+ self.typeck_results
+ .closure_min_captures_flattened(def_id)
+ .zip(substs.upvar_tys())
+ .map(|(captured_place, ty)| self.capture_upvar(expr, captured_place, ty)),
+ );
+
+ // Convert the closure fake reads, if any, from hir `Place` to ExprRef
+ let fake_reads = match self.typeck_results.closure_fake_reads.get(&def_id) {
+ Some(fake_reads) => fake_reads
+ .iter()
+ .map(|(place, cause, hir_id)| {
+ let expr = self.convert_captured_hir_place(expr, place.clone());
+ let expr_ref: &'thir Expr<'thir, 'tcx> = self.arena.alloc(expr);
+ (expr_ref, *cause, *hir_id)
+ })
+ .collect(),
+ None => Vec::new(),
+ };
- hir::ExprKind::InlineAsm(ref asm) => ExprKind::InlineAsm {
- template: asm.template,
- operands: asm
- .operands
- .iter()
- .map(|(op, _op_sp)| {
+ ExprKind::Closure { closure_id: def_id, substs, upvars, movability, fake_reads }
+ }
+
+ hir::ExprKind::Path(ref qpath) => {
+ let res = self.typeck_results().qpath_res(qpath, expr.hir_id);
+ self.convert_path_expr(expr, res)
+ }
+
+ hir::ExprKind::InlineAsm(ref asm) => ExprKind::InlineAsm {
+ template: asm.template,
+ operands: self.arena.alloc_from_iter(asm.operands.iter().map(|(op, _op_sp)| {
match *op {
hir::InlineAsmOperand::In { reg, ref expr } => {
- InlineAsmOperand::In { reg, expr: expr.to_ref() }
+ InlineAsmOperand::In { reg, expr: self.mirror_expr(expr) }
}
hir::InlineAsmOperand::Out { reg, late, ref expr } => {
InlineAsmOperand::Out {
reg,
late,
- expr: expr.as_ref().map(|expr| expr.to_ref()),
+ expr: expr.as_ref().map(|expr| self.mirror_expr(expr)),
}
}
hir::InlineAsmOperand::InOut { reg, late, ref expr } => {
- InlineAsmOperand::InOut { reg, late, expr: expr.to_ref() }
+ InlineAsmOperand::InOut { reg, late, expr: self.mirror_expr(expr) }
}
hir::InlineAsmOperand::SplitInOut {
reg,
} => InlineAsmOperand::SplitInOut {
reg,
late,
- in_expr: in_expr.to_ref(),
- out_expr: out_expr.as_ref().map(|expr| expr.to_ref()),
+ in_expr: self.mirror_expr(in_expr),
+ out_expr: out_expr.as_ref().map(|expr| self.mirror_expr(expr)),
},
hir::InlineAsmOperand::Const { ref expr } => {
- InlineAsmOperand::Const { expr: expr.to_ref() }
+ InlineAsmOperand::Const { expr: self.mirror_expr(expr) }
}
hir::InlineAsmOperand::Sym { ref expr } => {
let qpath = match expr.kind {
),
};
let temp_lifetime =
- cx.region_scope_tree.temporary_scope(expr.hir_id.local_id);
- let res = cx.typeck_results().qpath_res(qpath, expr.hir_id);
+ self.region_scope_tree.temporary_scope(expr.hir_id.local_id);
+ let res = self.typeck_results().qpath_res(qpath, expr.hir_id);
let ty;
match res {
Res::Def(DefKind::Fn, _) | Res::Def(DefKind::AssocFn, _) => {
- ty = cx.typeck_results().node_type(expr.hir_id);
- let user_ty = user_substs_applied_to_res(cx, expr.hir_id, res);
+ ty = self.typeck_results().node_type(expr.hir_id);
+ let user_ty = self.user_substs_applied_to_res(expr.hir_id, res);
InlineAsmOperand::SymFn {
- expr: Expr {
+ expr: self.arena.alloc(Expr {
ty,
temp_lifetime,
span: expr.span,
kind: ExprKind::Literal {
- literal: ty::Const::zero_sized(cx.tcx, ty),
+ literal: ty::Const::zero_sized(self.tcx, ty),
user_ty,
const_id: None,
},
- }
- .to_ref(),
+ }),
}
}
}
_ => {
- cx.tcx.sess.span_err(
+ self.tcx.sess.span_err(
expr.span,
"asm `sym` operand must point to a fn or static",
);
// Not a real fn, but we're not reaching codegen anyways...
- ty = cx.tcx.ty_error();
+ ty = self.tcx.ty_error();
InlineAsmOperand::SymFn {
- expr: Expr {
+ expr: self.arena.alloc(Expr {
ty,
temp_lifetime,
span: expr.span,
kind: ExprKind::Literal {
- literal: ty::Const::zero_sized(cx.tcx, ty),
+ literal: ty::Const::zero_sized(self.tcx, ty),
user_ty: None,
const_id: None,
},
- }
- .to_ref(),
+ }),
}
}
}
}
}
- })
- .collect(),
- options: asm.options,
- line_spans: asm.line_spans,
- },
-
- hir::ExprKind::LlvmInlineAsm(ref asm) => ExprKind::LlvmInlineAsm {
- asm: &asm.inner,
- outputs: asm.outputs_exprs.to_ref(),
- inputs: asm.inputs_exprs.to_ref(),
- },
-
- hir::ExprKind::ConstBlock(ref anon_const) => {
- let anon_const_def_id = cx.tcx.hir().local_def_id(anon_const.hir_id);
- let value = ty::Const::from_anon_const(cx.tcx, anon_const_def_id);
-
- ExprKind::ConstBlock { value }
- }
- // Now comes the rote stuff:
- hir::ExprKind::Repeat(ref v, ref count) => {
- let count_def_id = cx.tcx.hir().local_def_id(count.hir_id);
- let count = ty::Const::from_anon_const(cx.tcx, count_def_id);
+ })),
+ options: asm.options,
+ line_spans: asm.line_spans,
+ },
- ExprKind::Repeat { value: v.to_ref(), count }
- }
- hir::ExprKind::Ret(ref v) => ExprKind::Return { value: v.to_ref() },
- hir::ExprKind::Break(dest, ref value) => match dest.target_id {
- Ok(target_id) => ExprKind::Break {
- label: region::Scope { id: target_id.local_id, data: region::ScopeData::Node },
- value: value.to_ref(),
+ hir::ExprKind::LlvmInlineAsm(ref asm) => ExprKind::LlvmInlineAsm {
+ asm: &asm.inner,
+ outputs: self.mirror_exprs(asm.outputs_exprs),
+ inputs: self.mirror_exprs(asm.inputs_exprs),
+ },
+
+ hir::ExprKind::ConstBlock(ref anon_const) => {
+ let anon_const_def_id = self.tcx.hir().local_def_id(anon_const.hir_id);
+ let value = ty::Const::from_anon_const(self.tcx, anon_const_def_id);
+
+ ExprKind::ConstBlock { value }
+ }
+ // Now comes the rote stuff:
+ hir::ExprKind::Repeat(ref v, ref count) => {
+ let count_def_id = self.tcx.hir().local_def_id(count.hir_id);
+ let count = ty::Const::from_anon_const(self.tcx, count_def_id);
+
+ ExprKind::Repeat { value: self.mirror_expr(v), count }
+ }
+ hir::ExprKind::Ret(ref v) => {
+ ExprKind::Return { value: v.as_ref().map(|v| self.mirror_expr(v)) }
+ }
+ hir::ExprKind::Break(dest, ref value) => match dest.target_id {
+ Ok(target_id) => ExprKind::Break {
+ label: region::Scope { id: target_id.local_id, data: region::ScopeData::Node },
+ value: value.as_ref().map(|value| self.mirror_expr(value)),
+ },
+ Err(err) => bug!("invalid loop id for break: {}", err),
},
- Err(err) => bug!("invalid loop id for break: {}", err),
- },
- hir::ExprKind::Continue(dest) => match dest.target_id {
- Ok(loop_id) => ExprKind::Continue {
- label: region::Scope { id: loop_id.local_id, data: region::ScopeData::Node },
+ hir::ExprKind::Continue(dest) => match dest.target_id {
+ Ok(loop_id) => ExprKind::Continue {
+ label: region::Scope { id: loop_id.local_id, data: region::ScopeData::Node },
+ },
+ Err(err) => bug!("invalid loop id for continue: {}", err),
},
- Err(err) => bug!("invalid loop id for continue: {}", err),
- },
- hir::ExprKind::If(cond, then, else_opt) => ExprKind::If {
- cond: cond.to_ref(),
- then: then.to_ref(),
- else_opt: else_opt.map(|el| el.to_ref()),
- },
- hir::ExprKind::Match(ref discr, ref arms, _) => ExprKind::Match {
- scrutinee: discr.to_ref(),
- arms: arms.iter().map(|a| convert_arm(cx, a)).collect(),
- },
- hir::ExprKind::Loop(ref body, ..) => ExprKind::Loop { body: block::to_expr_ref(cx, body) },
- hir::ExprKind::Field(ref source, ..) => ExprKind::Field {
- lhs: source.to_ref(),
- name: Field::new(cx.tcx.field_index(expr.hir_id, cx.typeck_results)),
- },
- hir::ExprKind::Cast(ref source, ref cast_ty) => {
- // Check for a user-given type annotation on this `cast`
- let user_provided_types = cx.typeck_results.user_provided_types();
- let user_ty = user_provided_types.get(cast_ty.hir_id);
-
- debug!(
- "cast({:?}) has ty w/ hir_id {:?} and user provided ty {:?}",
- expr, cast_ty.hir_id, user_ty,
- );
-
- // Check to see if this cast is a "coercion cast", where the cast is actually done
- // using a coercion (or is a no-op).
- let cast = if cx.typeck_results().is_coercion_cast(source.hir_id) {
- // Convert the lexpr to a vexpr.
- ExprKind::Use { source: source.to_ref() }
- } else if cx.typeck_results().expr_ty(source).is_region_ptr() {
- // Special cased so that we can type check that the element
- // type of the source matches the pointed to type of the
- // destination.
- ExprKind::Pointer { source: source.to_ref(), cast: PointerCast::ArrayToPointer }
- } else {
- // check whether this is casting an enum variant discriminant
- // to prevent cycles, we refer to the discriminant initializer
- // which is always an integer and thus doesn't need to know the
- // enum's layout (or its tag type) to compute it during const eval
- // Example:
- // enum Foo {
- // A,
- // B = A as isize + 4,
- // }
- // The correct solution would be to add symbolic computations to miri,
- // so we wouldn't have to compute and store the actual value
- let var = if let hir::ExprKind::Path(ref qpath) = source.kind {
- let res = cx.typeck_results().qpath_res(qpath, source.hir_id);
- cx.typeck_results().node_type(source.hir_id).ty_adt_def().and_then(|adt_def| {
- match res {
- Res::Def(
- DefKind::Ctor(CtorOf::Variant, CtorKind::Const),
- variant_ctor_id,
- ) => {
- let idx = adt_def.variant_index_with_ctor_id(variant_ctor_id);
- let (d, o) = adt_def.discriminant_def_for_variant(idx);
- use rustc_middle::ty::util::IntTypeExt;
- let ty = adt_def.repr.discr_type();
- let ty = ty.to_ty(cx.tcx());
- Some((d, o, ty))
- }
- _ => None,
- }
- })
+ hir::ExprKind::If(cond, then, else_opt) => ExprKind::If {
+ cond: self.mirror_expr(cond),
+ then: self.mirror_expr(then),
+ else_opt: else_opt.map(|el| self.mirror_expr(el)),
+ },
+ hir::ExprKind::Match(ref discr, ref arms, _) => ExprKind::Match {
+ scrutinee: self.mirror_expr(discr),
+ arms: self.arena.alloc_from_iter(arms.iter().map(|a| self.convert_arm(a))),
+ },
+ hir::ExprKind::Loop(ref body, ..) => {
+ let block_ty = self.typeck_results().node_type(body.hir_id);
+ let temp_lifetime = self.region_scope_tree.temporary_scope(body.hir_id.local_id);
+ let block = self.mirror_block(body);
+ let body = self.arena.alloc(Expr {
+ ty: block_ty,
+ temp_lifetime,
+ span: block.span,
+ kind: ExprKind::Block { body: block },
+ });
+ ExprKind::Loop { body }
+ }
+ hir::ExprKind::Field(ref source, ..) => ExprKind::Field {
+ lhs: self.mirror_expr(source),
+ name: Field::new(self.tcx.field_index(expr.hir_id, self.typeck_results)),
+ },
+ hir::ExprKind::Cast(ref source, ref cast_ty) => {
+ // Check for a user-given type annotation on this `cast`
+ let user_provided_types = self.typeck_results.user_provided_types();
+ let user_ty = user_provided_types.get(cast_ty.hir_id);
+
+ debug!(
+ "cast({:?}) has ty w/ hir_id {:?} and user provided ty {:?}",
+ expr, cast_ty.hir_id, user_ty,
+ );
+
+ // Check to see if this cast is a "coercion cast", where the cast is actually done
+ // using a coercion (or is a no-op).
+ let cast = if self.typeck_results().is_coercion_cast(source.hir_id) {
+ // Convert the lexpr to a vexpr.
+ ExprKind::Use { source: self.mirror_expr(source) }
+ } else if self.typeck_results().expr_ty(source).is_region_ptr() {
+ // Special cased so that we can type check that the element
+ // type of the source matches the pointed to type of the
+ // destination.
+ ExprKind::Pointer {
+ source: self.mirror_expr(source),
+ cast: PointerCast::ArrayToPointer,
+ }
} else {
- None
- };
-
- let source = if let Some((did, offset, var_ty)) = var {
- let mk_const = |literal| {
- Expr {
- temp_lifetime,
- ty: var_ty,
- span: expr.span,
- kind: ExprKind::Literal { literal, user_ty: None, const_id: None },
- }
- .to_ref()
+ // check whether this is casting an enum variant discriminant
+ // to prevent cycles, we refer to the discriminant initializer
+ // which is always an integer and thus doesn't need to know the
+ // enum's layout (or its tag type) to compute it during const eval
+ // Example:
+ // enum Foo {
+ // A,
+ // B = A as isize + 4,
+ // }
+ // The correct solution would be to add symbolic computations to miri,
+ // so we wouldn't have to compute and store the actual value
+ let var = if let hir::ExprKind::Path(ref qpath) = source.kind {
+ let res = self.typeck_results().qpath_res(qpath, source.hir_id);
+ self.typeck_results().node_type(source.hir_id).ty_adt_def().and_then(
+ |adt_def| match res {
+ Res::Def(
+ DefKind::Ctor(CtorOf::Variant, CtorKind::Const),
+ variant_ctor_id,
+ ) => {
+ let idx = adt_def.variant_index_with_ctor_id(variant_ctor_id);
+ let (d, o) = adt_def.discriminant_def_for_variant(idx);
+ use rustc_middle::ty::util::IntTypeExt;
+ let ty = adt_def.repr.discr_type();
+ let ty = ty.to_ty(self.tcx());
+ Some((d, o, ty))
+ }
+ _ => None,
+ },
+ )
+ } else {
+ None
};
- let offset = mk_const(ty::Const::from_bits(
- cx.tcx,
- offset as u128,
- cx.param_env.and(var_ty),
- ));
- match did {
- Some(did) => {
- // in case we are offsetting from a computed discriminant
- // and not the beginning of discriminants (which is always `0`)
- let substs = InternalSubsts::identity_for_item(cx.tcx(), did);
- let lhs = mk_const(cx.tcx().mk_const(ty::Const {
- val: ty::ConstKind::Unevaluated(
- ty::WithOptConstParam::unknown(did),
- substs,
- None,
- ),
+
+ let source = if let Some((did, offset, var_ty)) = var {
+ let mk_const = |literal| {
+ self.arena.alloc(Expr {
+ temp_lifetime,
ty: var_ty,
- }));
- let bin = ExprKind::Binary { op: BinOp::Add, lhs, rhs: offset };
- Expr { temp_lifetime, ty: var_ty, span: expr.span, kind: bin }.to_ref()
+ span: expr.span,
+ kind: ExprKind::Literal { literal, user_ty: None, const_id: None },
+ })
+ };
+ let offset = mk_const(ty::Const::from_bits(
+ self.tcx,
+ offset as u128,
+ self.param_env.and(var_ty),
+ ));
+ match did {
+ Some(did) => {
+ // in case we are offsetting from a computed discriminant
+ // and not the beginning of discriminants (which is always `0`)
+ let substs = InternalSubsts::identity_for_item(self.tcx(), did);
+ let lhs = mk_const(self.tcx().mk_const(ty::Const {
+ val: ty::ConstKind::Unevaluated(
+ ty::WithOptConstParam::unknown(did),
+ substs,
+ None,
+ ),
+ ty: var_ty,
+ }));
+ let bin =
+ ExprKind::Binary { op: BinOp::Add, lhs: lhs, rhs: offset };
+ self.arena.alloc(Expr {
+ temp_lifetime,
+ ty: var_ty,
+ span: expr.span,
+ kind: bin,
+ })
+ }
+ None => offset,
}
- None => offset,
- }
- } else {
- source.to_ref()
- };
+ } else {
+ self.mirror_expr(source)
+ };
- ExprKind::Cast { source }
- };
+ ExprKind::Cast { source: source }
+ };
- if let Some(user_ty) = user_ty {
- // NOTE: Creating a new Expr and wrapping a Cast inside of it may be
- // inefficient, revisit this when performance becomes an issue.
- let cast_expr = Expr { temp_lifetime, ty: expr_ty, span: expr.span, kind: cast };
- debug!("make_mirror_unadjusted: (cast) user_ty={:?}", user_ty);
+ if let Some(user_ty) = user_ty {
+ // NOTE: Creating a new Expr and wrapping a Cast inside of it may be
+ // inefficient, revisit this when performance becomes an issue.
+ let cast_expr = self.arena.alloc(Expr {
+ temp_lifetime,
+ ty: expr_ty,
+ span: expr.span,
+ kind: cast,
+ });
+ debug!("make_mirror_unadjusted: (cast) user_ty={:?}", user_ty);
- ExprKind::ValueTypeAscription {
- source: cast_expr.to_ref(),
- user_ty: Some(*user_ty),
+ ExprKind::ValueTypeAscription { source: cast_expr, user_ty: Some(*user_ty) }
+ } else {
+ cast
}
- } else {
- cast
}
- }
- hir::ExprKind::Type(ref source, ref ty) => {
- let user_provided_types = cx.typeck_results.user_provided_types();
- let user_ty = user_provided_types.get(ty.hir_id).copied();
- debug!("make_mirror_unadjusted: (type) user_ty={:?}", user_ty);
- if source.is_syntactic_place_expr() {
- ExprKind::PlaceTypeAscription { source: source.to_ref(), user_ty }
- } else {
- ExprKind::ValueTypeAscription { source: source.to_ref(), user_ty }
+ hir::ExprKind::Type(ref source, ref ty) => {
+ let user_provided_types = self.typeck_results.user_provided_types();
+ let user_ty = user_provided_types.get(ty.hir_id).copied();
+ debug!("make_mirror_unadjusted: (type) user_ty={:?}", user_ty);
+ let mirrored = self.mirror_expr(source);
+ if source.is_syntactic_place_expr() {
+ ExprKind::PlaceTypeAscription { source: mirrored, user_ty }
+ } else {
+ ExprKind::ValueTypeAscription { source: mirrored, user_ty }
+ }
+ }
+ hir::ExprKind::DropTemps(ref source) => {
+ ExprKind::Use { source: self.mirror_expr(source) }
+ }
+ hir::ExprKind::Box(ref value) => ExprKind::Box { value: self.mirror_expr(value) },
+ hir::ExprKind::Array(ref fields) => {
+ ExprKind::Array { fields: self.mirror_exprs(fields) }
}
+ hir::ExprKind::Tup(ref fields) => ExprKind::Tuple { fields: self.mirror_exprs(fields) },
+
+ hir::ExprKind::Yield(ref v, _) => ExprKind::Yield { value: self.mirror_expr(v) },
+ hir::ExprKind::Err => unreachable!(),
+ };
+
+ Expr { temp_lifetime, ty: expr_ty, span: expr.span, kind }
+ }
+
+ fn user_substs_applied_to_res(
+ &mut self,
+ hir_id: hir::HirId,
+ res: Res,
+ ) -> Option<ty::CanonicalUserType<'tcx>> {
+ debug!("user_substs_applied_to_res: res={:?}", res);
+ let user_provided_type = match res {
+ // A reference to something callable -- e.g., a fn, method, or
+ // a tuple-struct or tuple-variant. This has the type of a
+ // `Fn` but with the user-given substitutions.
+ Res::Def(DefKind::Fn, _)
+ | Res::Def(DefKind::AssocFn, _)
+ | Res::Def(DefKind::Ctor(_, CtorKind::Fn), _)
+ | Res::Def(DefKind::Const, _)
+ | Res::Def(DefKind::AssocConst, _) => {
+ self.typeck_results().user_provided_types().get(hir_id).copied()
+ }
+
+ // A unit struct/variant which is used as a value (e.g.,
+ // `None`). This has the type of the enum/struct that defines
+ // this variant -- but with the substitutions given by the
+ // user.
+ Res::Def(DefKind::Ctor(_, CtorKind::Const), _) => {
+ self.user_substs_applied_to_ty_of_hir_id(hir_id)
+ }
+
+ // `Self` is used in expression as a tuple struct constructor or an unit struct constructor
+ Res::SelfCtor(_) => self.user_substs_applied_to_ty_of_hir_id(hir_id),
+
+ _ => bug!("user_substs_applied_to_res: unexpected res {:?} at {:?}", res, hir_id),
+ };
+ debug!("user_substs_applied_to_res: user_provided_type={:?}", user_provided_type);
+ user_provided_type
+ }
+
+ fn method_callee(
+ &mut self,
+ expr: &hir::Expr<'_>,
+ span: Span,
+ overloaded_callee: Option<(DefId, SubstsRef<'tcx>)>,
+ ) -> Expr<'thir, 'tcx> {
+ let temp_lifetime = self.region_scope_tree.temporary_scope(expr.hir_id.local_id);
+ let (def_id, substs, user_ty) = match overloaded_callee {
+ Some((def_id, substs)) => (def_id, substs, None),
+ None => {
+ let (kind, def_id) =
+ self.typeck_results().type_dependent_def(expr.hir_id).unwrap_or_else(|| {
+ span_bug!(expr.span, "no type-dependent def for method callee")
+ });
+ let user_ty = self.user_substs_applied_to_res(expr.hir_id, Res::Def(kind, def_id));
+ debug!("method_callee: user_ty={:?}", user_ty);
+ (def_id, self.typeck_results().node_substs(expr.hir_id), user_ty)
+ }
+ };
+ let ty = self.tcx().mk_fn_def(def_id, substs);
+ Expr {
+ temp_lifetime,
+ ty,
+ span,
+ kind: ExprKind::Literal {
+ literal: ty::Const::zero_sized(self.tcx(), ty),
+ user_ty,
+ const_id: None,
+ },
}
- hir::ExprKind::DropTemps(ref source) => ExprKind::Use { source: source.to_ref() },
- hir::ExprKind::Box(ref value) => ExprKind::Box { value: value.to_ref() },
- hir::ExprKind::Array(ref fields) => ExprKind::Array { fields: fields.to_ref() },
- hir::ExprKind::Tup(ref fields) => ExprKind::Tuple { fields: fields.to_ref() },
+ }
- hir::ExprKind::Yield(ref v, _) => ExprKind::Yield { value: v.to_ref() },
- hir::ExprKind::Err => unreachable!(),
- };
+ fn convert_arm(&mut self, arm: &'tcx hir::Arm<'tcx>) -> Arm<'thir, 'tcx> {
+ Arm {
+ pattern: self.pattern_from_hir(&arm.pat),
+ guard: arm.guard.as_ref().map(|g| match g {
+ hir::Guard::If(ref e) => Guard::If(self.mirror_expr(e)),
+ hir::Guard::IfLet(ref pat, ref e) => {
+ Guard::IfLet(self.pattern_from_hir(pat), self.mirror_expr(e))
+ }
+ }),
+ body: self.mirror_expr(arm.body),
+ lint_level: LintLevel::Explicit(arm.hir_id),
+ scope: region::Scope { id: arm.hir_id.local_id, data: region::ScopeData::Node },
+ span: arm.span,
+ }
+ }
- Expr { temp_lifetime, ty: expr_ty, span: expr.span, kind }
-}
+ fn convert_path_expr(
+ &mut self,
+ expr: &'tcx hir::Expr<'tcx>,
+ res: Res,
+ ) -> ExprKind<'thir, 'tcx> {
+ let substs = self.typeck_results().node_substs(expr.hir_id);
+ match res {
+ // A regular function, constructor function or a constant.
+ Res::Def(DefKind::Fn, _)
+ | Res::Def(DefKind::AssocFn, _)
+ | Res::Def(DefKind::Ctor(_, CtorKind::Fn), _)
+ | Res::SelfCtor(..) => {
+ let user_ty = self.user_substs_applied_to_res(expr.hir_id, res);
+ debug!("convert_path_expr: user_ty={:?}", user_ty);
+ ExprKind::Literal {
+ literal: ty::Const::zero_sized(
+ self.tcx,
+ self.typeck_results().node_type(expr.hir_id),
+ ),
+ user_ty,
+ const_id: None,
+ }
+ }
+
+ Res::Def(DefKind::ConstParam, def_id) => {
+ let hir_id = self.tcx.hir().local_def_id_to_hir_id(def_id.expect_local());
+ let item_id = self.tcx.hir().get_parent_node(hir_id);
+ let item_def_id = self.tcx.hir().local_def_id(item_id);
+ let generics = self.tcx.generics_of(item_def_id);
+ let index = generics.param_def_id_to_index[&def_id];
+ let name = self.tcx.hir().name(hir_id);
+ let val = ty::ConstKind::Param(ty::ParamConst::new(index, name));
+ ExprKind::Literal {
+ literal: self.tcx.mk_const(ty::Const {
+ val,
+ ty: self.typeck_results().node_type(expr.hir_id),
+ }),
+ user_ty: None,
+ const_id: Some(def_id),
+ }
+ }
+
+ Res::Def(DefKind::Const, def_id) | Res::Def(DefKind::AssocConst, def_id) => {
+ let user_ty = self.user_substs_applied_to_res(expr.hir_id, res);
+ debug!("convert_path_expr: (const) user_ty={:?}", user_ty);
+ ExprKind::Literal {
+ literal: self.tcx.mk_const(ty::Const {
+ val: ty::ConstKind::Unevaluated(
+ ty::WithOptConstParam::unknown(def_id),
+ substs,
+ None,
+ ),
+ ty: self.typeck_results().node_type(expr.hir_id),
+ }),
+ user_ty,
+ const_id: Some(def_id),
+ }
+ }
+
+ Res::Def(DefKind::Ctor(_, CtorKind::Const), def_id) => {
+ let user_provided_types = self.typeck_results.user_provided_types();
+ let user_provided_type = user_provided_types.get(expr.hir_id).copied();
+ debug!("convert_path_expr: user_provided_type={:?}", user_provided_type);
+ let ty = self.typeck_results().node_type(expr.hir_id);
+ match ty.kind() {
+ // A unit struct/variant which is used as a value.
+ // We return a completely different ExprKind here to account for this special case.
+ ty::Adt(adt_def, substs) => ExprKind::Adt {
+ adt_def,
+ variant_index: adt_def.variant_index_with_ctor_id(def_id),
+ substs,
+ user_ty: user_provided_type,
+ fields: self.arena.alloc_from_iter(iter::empty()),
+ base: None,
+ },
+ _ => bug!("unexpected ty: {:?}", ty),
+ }
+ }
+
+ // We encode uses of statics as a `*&STATIC` where the `&STATIC` part is
+ // a constant reference (or constant raw pointer for `static mut`) in MIR
+ Res::Def(DefKind::Static, id) => {
+ let ty = self.tcx.static_ptr_ty(id);
+ let temp_lifetime = self.region_scope_tree.temporary_scope(expr.hir_id.local_id);
+ let kind = if self.tcx.is_thread_local_static(id) {
+ ExprKind::ThreadLocalRef(id)
+ } else {
+ let ptr = self.tcx.create_static_alloc(id);
+ ExprKind::StaticRef {
+ literal: ty::Const::from_scalar(self.tcx, Scalar::Ptr(ptr.into()), ty),
+ def_id: id,
+ }
+ };
+ ExprKind::Deref {
+ arg: self.arena.alloc(Expr { ty, temp_lifetime, span: expr.span, kind }),
+ }
+ }
+
+ Res::Local(var_hir_id) => self.convert_var(var_hir_id),
-fn user_substs_applied_to_res<'tcx>(
- cx: &mut Cx<'_, 'tcx>,
- hir_id: hir::HirId,
- res: Res,
-) -> Option<ty::CanonicalUserType<'tcx>> {
- debug!("user_substs_applied_to_res: res={:?}", res);
- let user_provided_type = match res {
- // A reference to something callable -- e.g., a fn, method, or
- // a tuple-struct or tuple-variant. This has the type of a
- // `Fn` but with the user-given substitutions.
- Res::Def(DefKind::Fn, _)
- | Res::Def(DefKind::AssocFn, _)
- | Res::Def(DefKind::Ctor(_, CtorKind::Fn), _)
- | Res::Def(DefKind::Const, _)
- | Res::Def(DefKind::AssocConst, _) => {
- cx.typeck_results().user_provided_types().get(hir_id).copied()
+ _ => span_bug!(expr.span, "res `{:?}` not yet implemented", res),
}
+ }
- // A unit struct/variant which is used as a value (e.g.,
- // `None`). This has the type of the enum/struct that defines
- // this variant -- but with the substitutions given by the
- // user.
- Res::Def(DefKind::Ctor(_, CtorKind::Const), _) => {
- cx.user_substs_applied_to_ty_of_hir_id(hir_id)
+ fn convert_var(&mut self, var_hir_id: hir::HirId) -> ExprKind<'thir, 'tcx> {
+ // We want upvars here not captures.
+ // Captures will be handled in MIR.
+ let is_upvar = self
+ .tcx
+ .upvars_mentioned(self.body_owner)
+ .map_or(false, |upvars| upvars.contains_key(&var_hir_id));
+
+ debug!(
+ "convert_var({:?}): is_upvar={}, body_owner={:?}",
+ var_hir_id, is_upvar, self.body_owner
+ );
+
+ if is_upvar {
+ ExprKind::UpvarRef { closure_def_id: self.body_owner, var_hir_id }
+ } else {
+ ExprKind::VarRef { id: var_hir_id }
}
+ }
- // `Self` is used in expression as a tuple struct constructor or an unit struct constructor
- Res::SelfCtor(_) => cx.user_substs_applied_to_ty_of_hir_id(hir_id),
+ fn overloaded_operator(
+ &mut self,
+ expr: &'tcx hir::Expr<'tcx>,
+ args: &'thir [Expr<'thir, 'tcx>],
+ ) -> ExprKind<'thir, 'tcx> {
+ let fun = self.arena.alloc(self.method_callee(expr, expr.span, None));
+ ExprKind::Call { ty: fun.ty, fun, args, from_hir_call: false, fn_span: expr.span }
+ }
- _ => bug!("user_substs_applied_to_res: unexpected res {:?} at {:?}", res, hir_id),
- };
- debug!("user_substs_applied_to_res: user_provided_type={:?}", user_provided_type);
- user_provided_type
-}
+ fn overloaded_place(
+ &mut self,
+ expr: &'tcx hir::Expr<'tcx>,
+ place_ty: Ty<'tcx>,
+ overloaded_callee: Option<(DefId, SubstsRef<'tcx>)>,
+ args: &'thir [Expr<'thir, 'tcx>],
+ span: Span,
+ ) -> ExprKind<'thir, 'tcx> {
+ // For an overloaded *x or x[y] expression of type T, the method
+ // call returns an &T and we must add the deref so that the types
+ // line up (this is because `*x` and `x[y]` represent places):
+
+ // Reconstruct the output assuming it's a reference with the
+ // same region and mutability as the receiver. This holds for
+ // `Deref(Mut)::Deref(_mut)` and `Index(Mut)::index(_mut)`.
+ let (region, mutbl) = match *args[0].ty.kind() {
+ ty::Ref(region, _, mutbl) => (region, mutbl),
+ _ => span_bug!(span, "overloaded_place: receiver is not a reference"),
+ };
+ let ref_ty = self.tcx.mk_ref(region, ty::TypeAndMut { ty: place_ty, mutbl });
+
+ // construct the complete expression `foo()` for the overloaded call,
+ // which will yield the &T type
+ let temp_lifetime = self.region_scope_tree.temporary_scope(expr.hir_id.local_id);
+ let fun = self.arena.alloc(self.method_callee(expr, span, overloaded_callee));
+ let ref_expr = self.arena.alloc(Expr {
+ temp_lifetime,
+ ty: ref_ty,
+ span,
+ kind: ExprKind::Call { ty: fun.ty, fun, args, from_hir_call: false, fn_span: span },
+ });
-fn method_callee<'a, 'tcx>(
- cx: &mut Cx<'a, 'tcx>,
- expr: &hir::Expr<'_>,
- span: Span,
- overloaded_callee: Option<(DefId, SubstsRef<'tcx>)>,
-) -> Expr<'tcx> {
- let temp_lifetime = cx.region_scope_tree.temporary_scope(expr.hir_id.local_id);
- let (def_id, substs, user_ty) = match overloaded_callee {
- Some((def_id, substs)) => (def_id, substs, None),
- None => {
- let (kind, def_id) = cx
- .typeck_results()
- .type_dependent_def(expr.hir_id)
- .unwrap_or_else(|| span_bug!(expr.span, "no type-dependent def for method callee"));
- let user_ty = user_substs_applied_to_res(cx, expr.hir_id, Res::Def(kind, def_id));
- debug!("method_callee: user_ty={:?}", user_ty);
- (def_id, cx.typeck_results().node_substs(expr.hir_id), user_ty)
+ // construct and return a deref wrapper `*foo()`
+ ExprKind::Deref { arg: ref_expr }
+ }
+
+ fn convert_captured_hir_place(
+ &mut self,
+ closure_expr: &'tcx hir::Expr<'tcx>,
+ place: HirPlace<'tcx>,
+ ) -> Expr<'thir, 'tcx> {
+ let temp_lifetime = self.region_scope_tree.temporary_scope(closure_expr.hir_id.local_id);
+ let var_ty = place.base_ty;
+
+ // The result of capture analysis in `rustc_typeck/check/upvar.rs`represents a captured path
+ // as it's seen for use within the closure and not at the time of closure creation.
+ //
+ // That is we see expect to see it start from a captured upvar and not something that is local
+ // to the closure's parent.
+ let var_hir_id = match place.base {
+ HirPlaceBase::Upvar(upvar_id) => upvar_id.var_path.hir_id,
+ base => bug!("Expected an upvar, found {:?}", base),
+ };
+
+ let mut captured_place_expr = Expr {
+ temp_lifetime,
+ ty: var_ty,
+ span: closure_expr.span,
+ kind: self.convert_var(var_hir_id),
+ };
+
+ for proj in place.projections.iter() {
+ let kind = match proj.kind {
+ HirProjectionKind::Deref => {
+ ExprKind::Deref { arg: self.arena.alloc(captured_place_expr) }
+ }
+ HirProjectionKind::Field(field, ..) => {
+ // Variant index will always be 0, because for multi-variant
+ // enums, we capture the enum entirely.
+ ExprKind::Field {
+ lhs: self.arena.alloc(captured_place_expr),
+ name: Field::new(field as usize),
+ }
+ }
+ HirProjectionKind::Index | HirProjectionKind::Subslice => {
+ // We don't capture these projections, so we can ignore them here
+ continue;
+ }
+ };
+
+ captured_place_expr =
+ Expr { temp_lifetime, ty: proj.ty, span: closure_expr.span, kind };
+ }
+
+ captured_place_expr
+ }
+
+ fn capture_upvar(
+ &mut self,
+ closure_expr: &'tcx hir::Expr<'tcx>,
+ captured_place: &'tcx ty::CapturedPlace<'tcx>,
+ upvar_ty: Ty<'tcx>,
+ ) -> Expr<'thir, 'tcx> {
+ let upvar_capture = captured_place.info.capture_kind;
+ let captured_place_expr =
+ self.convert_captured_hir_place(closure_expr, captured_place.place.clone());
+ let temp_lifetime = self.region_scope_tree.temporary_scope(closure_expr.hir_id.local_id);
+
+ match upvar_capture {
+ ty::UpvarCapture::ByValue(_) => captured_place_expr,
+ ty::UpvarCapture::ByRef(upvar_borrow) => {
+ let borrow_kind = match upvar_borrow.kind {
+ ty::BorrowKind::ImmBorrow => BorrowKind::Shared,
+ ty::BorrowKind::UniqueImmBorrow => BorrowKind::Unique,
+ ty::BorrowKind::MutBorrow => BorrowKind::Mut { allow_two_phase_borrow: false },
+ };
+ Expr {
+ temp_lifetime,
+ ty: upvar_ty,
+ span: closure_expr.span,
+ kind: ExprKind::Borrow {
+ borrow_kind,
+ arg: self.arena.alloc(captured_place_expr),
+ },
+ }
+ }
}
- };
- let ty = cx.tcx().mk_fn_def(def_id, substs);
- Expr {
- temp_lifetime,
- ty,
- span,
- kind: ExprKind::Literal {
- literal: ty::Const::zero_sized(cx.tcx(), ty),
- user_ty,
- const_id: None,
- },
+ }
+
+ /// Converts a list of named fields (i.e., for struct-like struct/enum ADTs) into FieldExpr.
+ fn field_refs(
+ &mut self,
+ fields: &'tcx [hir::ExprField<'tcx>],
+ ) -> &'thir [FieldExpr<'thir, 'tcx>] {
+ self.arena.alloc_from_iter(fields.iter().map(|field| FieldExpr {
+ name: Field::new(self.tcx.field_index(field.hir_id, self.typeck_results)),
+ expr: self.mirror_expr(field.expr),
+ }))
}
}
}
}
-fn convert_arm<'tcx>(cx: &mut Cx<'_, 'tcx>, arm: &'tcx hir::Arm<'tcx>) -> Arm<'tcx> {
- Arm {
- pattern: cx.pattern_from_hir(&arm.pat),
- guard: arm.guard.as_ref().map(|g| match g {
- hir::Guard::If(ref e) => Guard::If(e.to_ref()),
- hir::Guard::IfLet(ref pat, ref e) => Guard::IfLet(cx.pattern_from_hir(pat), e.to_ref()),
- }),
- body: arm.body.to_ref(),
- lint_level: LintLevel::Explicit(arm.hir_id),
- scope: region::Scope { id: arm.hir_id.local_id, data: region::ScopeData::Node },
- span: arm.span,
- }
-}
-
-fn convert_path_expr<'a, 'tcx>(
- cx: &mut Cx<'a, 'tcx>,
- expr: &'tcx hir::Expr<'tcx>,
- res: Res,
-) -> ExprKind<'tcx> {
- let substs = cx.typeck_results().node_substs(expr.hir_id);
- match res {
- // A regular function, constructor function or a constant.
- Res::Def(DefKind::Fn, _)
- | Res::Def(DefKind::AssocFn, _)
- | Res::Def(DefKind::Ctor(_, CtorKind::Fn), _)
- | Res::SelfCtor(..) => {
- let user_ty = user_substs_applied_to_res(cx, expr.hir_id, res);
- debug!("convert_path_expr: user_ty={:?}", user_ty);
- ExprKind::Literal {
- literal: ty::Const::zero_sized(cx.tcx, cx.typeck_results().node_type(expr.hir_id)),
- user_ty,
- const_id: None,
- }
- }
-
- Res::Def(DefKind::ConstParam, def_id) => {
- let hir_id = cx.tcx.hir().local_def_id_to_hir_id(def_id.expect_local());
- let item_id = cx.tcx.hir().get_parent_node(hir_id);
- let item_def_id = cx.tcx.hir().local_def_id(item_id);
- let generics = cx.tcx.generics_of(item_def_id);
- let index = generics.param_def_id_to_index[&def_id];
- let name = cx.tcx.hir().name(hir_id);
- let val = ty::ConstKind::Param(ty::ParamConst::new(index, name));
- ExprKind::Literal {
- literal: cx
- .tcx
- .mk_const(ty::Const { val, ty: cx.typeck_results().node_type(expr.hir_id) }),
- user_ty: None,
- const_id: Some(def_id),
- }
- }
-
- Res::Def(DefKind::Const, def_id) | Res::Def(DefKind::AssocConst, def_id) => {
- let user_ty = user_substs_applied_to_res(cx, expr.hir_id, res);
- debug!("convert_path_expr: (const) user_ty={:?}", user_ty);
- ExprKind::Literal {
- literal: cx.tcx.mk_const(ty::Const {
- val: ty::ConstKind::Unevaluated(
- ty::WithOptConstParam::unknown(def_id),
- substs,
- None,
- ),
- ty: cx.typeck_results().node_type(expr.hir_id),
- }),
- user_ty,
- const_id: Some(def_id),
- }
- }
-
- Res::Def(DefKind::Ctor(_, CtorKind::Const), def_id) => {
- let user_provided_types = cx.typeck_results.user_provided_types();
- let user_provided_type = user_provided_types.get(expr.hir_id).copied();
- debug!("convert_path_expr: user_provided_type={:?}", user_provided_type);
- let ty = cx.typeck_results().node_type(expr.hir_id);
- match ty.kind() {
- // A unit struct/variant which is used as a value.
- // We return a completely different ExprKind here to account for this special case.
- ty::Adt(adt_def, substs) => ExprKind::Adt {
- adt_def,
- variant_index: adt_def.variant_index_with_ctor_id(def_id),
- substs,
- user_ty: user_provided_type,
- fields: vec![],
- base: None,
- },
- _ => bug!("unexpected ty: {:?}", ty),
- }
- }
-
- // We encode uses of statics as a `*&STATIC` where the `&STATIC` part is
- // a constant reference (or constant raw pointer for `static mut`) in MIR
- Res::Def(DefKind::Static, id) => {
- let ty = cx.tcx.static_ptr_ty(id);
- let temp_lifetime = cx.region_scope_tree.temporary_scope(expr.hir_id.local_id);
- let kind = if cx.tcx.is_thread_local_static(id) {
- ExprKind::ThreadLocalRef(id)
- } else {
- let ptr = cx.tcx.create_static_alloc(id);
- ExprKind::StaticRef {
- literal: ty::Const::from_scalar(cx.tcx, Scalar::Ptr(ptr.into()), ty),
- def_id: id,
- }
- };
- ExprKind::Deref { arg: Expr { ty, temp_lifetime, span: expr.span, kind }.to_ref() }
- }
-
- Res::Local(var_hir_id) => convert_var(cx, var_hir_id),
-
- _ => span_bug!(expr.span, "res `{:?}` not yet implemented", res),
- }
-}
-
-fn convert_var<'tcx>(cx: &mut Cx<'_, 'tcx>, var_hir_id: hir::HirId) -> ExprKind<'tcx> {
- // We want upvars here not captures.
- // Captures will be handled in MIR.
- let is_upvar = cx
- .tcx
- .upvars_mentioned(cx.body_owner)
- .map_or(false, |upvars| upvars.contains_key(&var_hir_id));
-
- debug!("convert_var({:?}): is_upvar={}, body_owner={:?}", var_hir_id, is_upvar, cx.body_owner);
-
- if is_upvar {
- ExprKind::UpvarRef { closure_def_id: cx.body_owner, var_hir_id }
- } else {
- ExprKind::VarRef { id: var_hir_id }
- }
-}
-
fn bin_op(op: hir::BinOpKind) -> BinOp {
match op {
hir::BinOpKind::Add => BinOp::Add,
_ => bug!("no equivalent for ast binop {:?}", op),
}
}
-
-fn overloaded_operator<'a, 'tcx>(
- cx: &mut Cx<'a, 'tcx>,
- expr: &'tcx hir::Expr<'tcx>,
- args: Vec<ExprRef<'tcx>>,
-) -> ExprKind<'tcx> {
- let fun = method_callee(cx, expr, expr.span, None);
- ExprKind::Call { ty: fun.ty, fun: fun.to_ref(), args, from_hir_call: false, fn_span: expr.span }
-}
-
-fn overloaded_place<'a, 'tcx>(
- cx: &mut Cx<'a, 'tcx>,
- expr: &'tcx hir::Expr<'tcx>,
- place_ty: Ty<'tcx>,
- overloaded_callee: Option<(DefId, SubstsRef<'tcx>)>,
- args: Vec<ExprRef<'tcx>>,
- span: Span,
-) -> ExprKind<'tcx> {
- // For an overloaded *x or x[y] expression of type T, the method
- // call returns an &T and we must add the deref so that the types
- // line up (this is because `*x` and `x[y]` represent places):
-
- let recv_ty = match args[0] {
- ExprRef::Thir(e) => cx.typeck_results().expr_ty_adjusted(e),
- ExprRef::Mirror(ref e) => e.ty,
- };
-
- // Reconstruct the output assuming it's a reference with the
- // same region and mutability as the receiver. This holds for
- // `Deref(Mut)::Deref(_mut)` and `Index(Mut)::index(_mut)`.
- let (region, mutbl) = match *recv_ty.kind() {
- ty::Ref(region, _, mutbl) => (region, mutbl),
- _ => span_bug!(span, "overloaded_place: receiver is not a reference"),
- };
- let ref_ty = cx.tcx.mk_ref(region, ty::TypeAndMut { ty: place_ty, mutbl });
-
- // construct the complete expression `foo()` for the overloaded call,
- // which will yield the &T type
- let temp_lifetime = cx.region_scope_tree.temporary_scope(expr.hir_id.local_id);
- let fun = method_callee(cx, expr, span, overloaded_callee);
- let ref_expr = Expr {
- temp_lifetime,
- ty: ref_ty,
- span,
- kind: ExprKind::Call {
- ty: fun.ty,
- fun: fun.to_ref(),
- args,
- from_hir_call: false,
- fn_span: span,
- },
- };
-
- // construct and return a deref wrapper `*foo()`
- ExprKind::Deref { arg: ref_expr.to_ref() }
-}
-
-fn capture_upvar<'a, 'tcx>(
- cx: &mut Cx<'_, 'tcx>,
- closure_expr: &'tcx hir::Expr<'tcx>,
- captured_place: &'a ty::CapturedPlace<'tcx>,
- upvar_ty: Ty<'tcx>,
-) -> ExprRef<'tcx> {
- let upvar_capture = captured_place.info.capture_kind;
- let temp_lifetime = cx.region_scope_tree.temporary_scope(closure_expr.hir_id.local_id);
- let var_ty = captured_place.place.base_ty;
-
- // The result of capture analysis in `rustc_typeck/check/upvar.rs`represents a captured path
- // as it's seen for use within the closure and not at the time of closure creation.
- //
- // That is we see expect to see it start from a captured upvar and not something that is local
- // to the closure's parent.
- let var_hir_id = match captured_place.place.base {
- HirPlaceBase::Upvar(upvar_id) => upvar_id.var_path.hir_id,
- base => bug!("Expected an upvar, found {:?}", base),
- };
-
- let mut captured_place_expr = Expr {
- temp_lifetime,
- ty: var_ty,
- span: closure_expr.span,
- kind: convert_var(cx, var_hir_id),
- };
-
- for proj in captured_place.place.projections.iter() {
- let kind = match proj.kind {
- HirProjectionKind::Deref => ExprKind::Deref { arg: captured_place_expr.to_ref() },
- HirProjectionKind::Field(field, ..) => {
- // Variant index will always be 0, because for multi-variant
- // enums, we capture the enum entirely.
- ExprKind::Field {
- lhs: captured_place_expr.to_ref(),
- name: Field::new(field as usize),
- }
- }
- HirProjectionKind::Index | HirProjectionKind::Subslice => {
- // We don't capture these projections, so we can ignore them here
- continue;
- }
- };
-
- captured_place_expr = Expr { temp_lifetime, ty: proj.ty, span: closure_expr.span, kind };
- }
-
- match upvar_capture {
- ty::UpvarCapture::ByValue(_) => captured_place_expr.to_ref(),
- ty::UpvarCapture::ByRef(upvar_borrow) => {
- let borrow_kind = match upvar_borrow.kind {
- ty::BorrowKind::ImmBorrow => BorrowKind::Shared,
- ty::BorrowKind::UniqueImmBorrow => BorrowKind::Unique,
- ty::BorrowKind::MutBorrow => BorrowKind::Mut { allow_two_phase_borrow: false },
- };
- Expr {
- temp_lifetime,
- ty: upvar_ty,
- span: closure_expr.span,
- kind: ExprKind::Borrow { borrow_kind, arg: captured_place_expr.to_ref() },
- }
- .to_ref()
- }
- }
-}
-
-/// Converts a list of named fields (i.e., for struct-like struct/enum ADTs) into FieldExprRef.
-fn field_refs<'a, 'tcx>(
- cx: &mut Cx<'a, 'tcx>,
- fields: &'tcx [hir::Field<'tcx>],
-) -> Vec<FieldExprRef<'tcx>> {
- fields
- .iter()
- .map(|field| FieldExprRef {
- name: Field::new(cx.tcx.field_index(field.hir_id, cx.typeck_results)),
- expr: field.expr.to_ref(),
- })
- .collect()
-}
projects / rustc.git / blobdiff