1147 lines
51 KiB
Rust
1147 lines
51 KiB
Rust
use crate::thir::cx::Cx;
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use crate::thir::util::UserAnnotatedTyHelpers;
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use crate::thir::*;
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use rustc_data_structures::stack::ensure_sufficient_stack;
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use rustc_hir as hir;
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use rustc_hir::def::{CtorKind, CtorOf, DefKind, Res};
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use rustc_index::vec::Idx;
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use rustc_middle::hir::place::PlaceBase as HirPlaceBase;
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use rustc_middle::hir::place::ProjectionKind as HirProjectionKind;
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use rustc_middle::mir::interpret::Scalar;
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use rustc_middle::mir::BorrowKind;
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use rustc_middle::ty::adjustment::{
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Adjust, Adjustment, AutoBorrow, AutoBorrowMutability, PointerCast,
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};
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use rustc_middle::ty::subst::{InternalSubsts, SubstsRef};
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use rustc_middle::ty::{self, AdtKind, Ty};
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use rustc_span::Span;
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use std::iter;
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impl<'thir, 'tcx> Cx<'thir, 'tcx> {
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/// Mirrors and allocates a single [`hir::Expr`]. If you need to mirror a whole slice
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/// of expressions, prefer using [`mirror_exprs`].
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///
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/// [`mirror_exprs`]: Self::mirror_exprs
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crate fn mirror_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) -> &'thir Expr<'thir, 'tcx> {
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// `mirror_expr` is recursing very deep. Make sure the stack doesn't overflow.
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ensure_sufficient_stack(|| self.arena.alloc(self.mirror_expr_inner(expr)))
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}
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/// Mirrors and allocates a slice of [`hir::Expr`]s. They will be allocated as a
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/// contiguous sequence in memory.
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crate fn mirror_exprs(&mut self, exprs: &'tcx [hir::Expr<'tcx>]) -> &'thir [Expr<'thir, 'tcx>] {
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self.arena.alloc_from_iter(exprs.iter().map(|expr| self.mirror_expr_inner(expr)))
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}
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/// Mirrors a [`hir::Expr`] without allocating it into the arena.
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/// This is a separate, private function so that [`mirror_expr`] and [`mirror_exprs`] can
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/// decide how to allocate this expression (alone or within a slice).
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///
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/// [`mirror_expr`]: Self::mirror_expr
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/// [`mirror_exprs`]: Self::mirror_exprs
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pub(super) fn mirror_expr_inner(
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&mut self,
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hir_expr: &'tcx hir::Expr<'tcx>,
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) -> Expr<'thir, 'tcx> {
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let temp_lifetime = self.region_scope_tree.temporary_scope(hir_expr.hir_id.local_id);
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let expr_scope =
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region::Scope { id: hir_expr.hir_id.local_id, data: region::ScopeData::Node };
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debug!("Expr::make_mirror(): id={}, span={:?}", hir_expr.hir_id, hir_expr.span);
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let mut expr = self.make_mirror_unadjusted(hir_expr);
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// Now apply adjustments, if any.
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for adjustment in self.typeck_results.expr_adjustments(hir_expr) {
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debug!("make_mirror: expr={:?} applying adjustment={:?}", expr, adjustment);
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expr = self.apply_adjustment(hir_expr, expr, adjustment);
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}
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// Next, wrap this up in the expr's scope.
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expr = Expr {
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temp_lifetime,
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ty: expr.ty,
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span: hir_expr.span,
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kind: ExprKind::Scope {
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region_scope: expr_scope,
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value: self.arena.alloc(expr),
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lint_level: LintLevel::Explicit(hir_expr.hir_id),
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},
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};
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// Finally, create a destruction scope, if any.
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if let Some(region_scope) =
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self.region_scope_tree.opt_destruction_scope(hir_expr.hir_id.local_id)
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{
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expr = Expr {
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temp_lifetime,
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ty: expr.ty,
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span: hir_expr.span,
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kind: ExprKind::Scope {
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region_scope,
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value: self.arena.alloc(expr),
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lint_level: LintLevel::Inherited,
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},
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};
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}
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// OK, all done!
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expr
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}
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fn apply_adjustment(
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&mut self,
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hir_expr: &'tcx hir::Expr<'tcx>,
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mut expr: Expr<'thir, 'tcx>,
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adjustment: &Adjustment<'tcx>,
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) -> Expr<'thir, 'tcx> {
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let Expr { temp_lifetime, mut span, .. } = expr;
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// Adjust the span from the block, to the last expression of the
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// block. This is a better span when returning a mutable reference
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// with too short a lifetime. The error message will use the span
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// from the assignment to the return place, which should only point
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// at the returned value, not the entire function body.
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//
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// fn return_short_lived<'a>(x: &'a mut i32) -> &'static mut i32 {
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// x
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// // ^ error message points at this expression.
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// }
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let mut adjust_span = |expr: &mut Expr<'thir, 'tcx>| {
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if let ExprKind::Block { body } = &expr.kind {
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if let Some(ref last_expr) = body.expr {
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span = last_expr.span;
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expr.span = span;
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}
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}
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};
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let kind = match adjustment.kind {
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Adjust::Pointer(PointerCast::Unsize) => {
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adjust_span(&mut expr);
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ExprKind::Pointer { cast: PointerCast::Unsize, source: self.arena.alloc(expr) }
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}
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Adjust::Pointer(cast) => ExprKind::Pointer { cast, source: self.arena.alloc(expr) },
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Adjust::NeverToAny => ExprKind::NeverToAny { source: self.arena.alloc(expr) },
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Adjust::Deref(None) => {
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adjust_span(&mut expr);
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ExprKind::Deref { arg: self.arena.alloc(expr) }
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}
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Adjust::Deref(Some(deref)) => {
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// We don't need to do call adjust_span here since
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// deref coercions always start with a built-in deref.
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let call = deref.method_call(self.tcx(), expr.ty);
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expr = Expr {
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temp_lifetime,
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ty: self
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.tcx
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.mk_ref(deref.region, ty::TypeAndMut { ty: expr.ty, mutbl: deref.mutbl }),
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span,
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kind: ExprKind::Borrow {
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borrow_kind: deref.mutbl.to_borrow_kind(),
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arg: self.arena.alloc(expr),
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},
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};
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self.overloaded_place(
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hir_expr,
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adjustment.target,
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Some(call),
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self.arena.alloc_from_iter(iter::once(expr)),
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deref.span,
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)
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}
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Adjust::Borrow(AutoBorrow::Ref(_, m)) => {
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ExprKind::Borrow { borrow_kind: m.to_borrow_kind(), arg: self.arena.alloc(expr) }
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}
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Adjust::Borrow(AutoBorrow::RawPtr(mutability)) => {
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ExprKind::AddressOf { mutability, arg: self.arena.alloc(expr) }
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}
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};
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Expr { temp_lifetime, ty: adjustment.target, span, kind }
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}
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fn make_mirror_unadjusted(&mut self, expr: &'tcx hir::Expr<'tcx>) -> Expr<'thir, 'tcx> {
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let expr_ty = self.typeck_results().expr_ty(expr);
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let temp_lifetime = self.region_scope_tree.temporary_scope(expr.hir_id.local_id);
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let kind = match expr.kind {
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// Here comes the interesting stuff:
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hir::ExprKind::MethodCall(_, method_span, ref args, fn_span) => {
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// Rewrite a.b(c) into UFCS form like Trait::b(a, c)
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let expr = self.method_callee(expr, method_span, None);
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let args = self.mirror_exprs(args);
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ExprKind::Call {
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ty: expr.ty,
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fun: self.arena.alloc(expr),
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args,
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from_hir_call: true,
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fn_span,
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}
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}
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hir::ExprKind::Call(ref fun, ref args) => {
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if self.typeck_results().is_method_call(expr) {
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// The callee is something implementing Fn, FnMut, or FnOnce.
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// Find the actual method implementation being called and
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// build the appropriate UFCS call expression with the
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// callee-object as expr parameter.
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// rewrite f(u, v) into FnOnce::call_once(f, (u, v))
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let method = self.method_callee(expr, fun.span, None);
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let arg_tys = args.iter().map(|e| self.typeck_results().expr_ty_adjusted(e));
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let tupled_args = Expr {
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ty: self.tcx.mk_tup(arg_tys),
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temp_lifetime,
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span: expr.span,
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kind: ExprKind::Tuple { fields: self.mirror_exprs(args) },
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};
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ExprKind::Call {
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ty: method.ty,
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fun: self.arena.alloc(method),
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args: self
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.arena
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.alloc_from_iter(vec![self.mirror_expr_inner(fun), tupled_args]),
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from_hir_call: true,
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fn_span: expr.span,
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}
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} else {
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let adt_data =
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if let hir::ExprKind::Path(hir::QPath::Resolved(_, ref path)) = fun.kind {
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// Tuple-like ADTs are represented as ExprKind::Call. We convert them here.
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expr_ty.ty_adt_def().and_then(|adt_def| match path.res {
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Res::Def(DefKind::Ctor(_, CtorKind::Fn), ctor_id) => {
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Some((adt_def, adt_def.variant_index_with_ctor_id(ctor_id)))
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}
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Res::SelfCtor(..) => Some((adt_def, VariantIdx::new(0))),
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_ => None,
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})
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} else {
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None
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};
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if let Some((adt_def, index)) = adt_data {
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let substs = self.typeck_results().node_substs(fun.hir_id);
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let user_provided_types = self.typeck_results().user_provided_types();
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let user_ty =
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user_provided_types.get(fun.hir_id).copied().map(|mut u_ty| {
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if let UserType::TypeOf(ref mut did, _) = &mut u_ty.value {
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*did = adt_def.did;
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}
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u_ty
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});
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debug!("make_mirror_unadjusted: (call) user_ty={:?}", user_ty);
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let field_refs =
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self.arena.alloc_from_iter(args.iter().enumerate().map(|(idx, e)| {
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FieldExpr { name: Field::new(idx), expr: self.mirror_expr(e) }
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}));
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ExprKind::Adt {
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adt_def,
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substs,
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variant_index: index,
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fields: field_refs,
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user_ty,
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base: None,
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}
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} else {
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ExprKind::Call {
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ty: self.typeck_results().node_type(fun.hir_id),
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fun: self.mirror_expr(fun),
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args: self.mirror_exprs(args),
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from_hir_call: true,
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fn_span: expr.span,
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}
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}
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}
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}
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hir::ExprKind::AddrOf(hir::BorrowKind::Ref, mutbl, ref arg) => {
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ExprKind::Borrow { borrow_kind: mutbl.to_borrow_kind(), arg: self.mirror_expr(arg) }
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}
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hir::ExprKind::AddrOf(hir::BorrowKind::Raw, mutability, ref arg) => {
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ExprKind::AddressOf { mutability, arg: self.mirror_expr(arg) }
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}
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hir::ExprKind::Block(ref blk, _) => ExprKind::Block { body: self.mirror_block(blk) },
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hir::ExprKind::Assign(ref lhs, ref rhs, _) => {
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ExprKind::Assign { lhs: self.mirror_expr(lhs), rhs: self.mirror_expr(rhs) }
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}
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hir::ExprKind::AssignOp(op, ref lhs, ref rhs) => {
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if self.typeck_results().is_method_call(expr) {
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let lhs = self.mirror_expr_inner(lhs);
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let rhs = self.mirror_expr_inner(rhs);
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self.overloaded_operator(expr, self.arena.alloc_from_iter(vec![lhs, rhs]))
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} else {
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ExprKind::AssignOp {
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op: bin_op(op.node),
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lhs: self.mirror_expr(lhs),
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rhs: self.mirror_expr(rhs),
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}
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}
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}
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hir::ExprKind::Lit(ref lit) => ExprKind::Literal {
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literal: self.const_eval_literal(&lit.node, expr_ty, lit.span, false),
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user_ty: None,
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const_id: None,
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},
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hir::ExprKind::Binary(op, ref lhs, ref rhs) => {
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if self.typeck_results().is_method_call(expr) {
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let lhs = self.mirror_expr_inner(lhs);
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let rhs = self.mirror_expr_inner(rhs);
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self.overloaded_operator(expr, self.arena.alloc_from_iter(vec![lhs, rhs]))
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} else {
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// FIXME overflow
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match op.node {
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hir::BinOpKind::And => ExprKind::LogicalOp {
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op: LogicalOp::And,
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lhs: self.mirror_expr(lhs),
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rhs: self.mirror_expr(rhs),
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},
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hir::BinOpKind::Or => ExprKind::LogicalOp {
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op: LogicalOp::Or,
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lhs: self.mirror_expr(lhs),
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rhs: self.mirror_expr(rhs),
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},
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_ => {
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let op = bin_op(op.node);
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ExprKind::Binary {
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op,
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lhs: self.mirror_expr(lhs),
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rhs: self.mirror_expr(rhs),
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}
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}
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}
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}
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}
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hir::ExprKind::Index(ref lhs, ref index) => {
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if self.typeck_results().is_method_call(expr) {
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let lhs = self.mirror_expr_inner(lhs);
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let index = self.mirror_expr_inner(index);
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self.overloaded_place(
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expr,
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expr_ty,
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None,
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self.arena.alloc_from_iter(vec![lhs, index]),
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expr.span,
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)
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} else {
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ExprKind::Index { lhs: self.mirror_expr(lhs), index: self.mirror_expr(index) }
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}
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}
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hir::ExprKind::Unary(hir::UnOp::Deref, ref arg) => {
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if self.typeck_results().is_method_call(expr) {
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let arg = self.mirror_expr_inner(arg);
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self.overloaded_place(
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expr,
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expr_ty,
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None,
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self.arena.alloc_from_iter(iter::once(arg)),
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expr.span,
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)
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} else {
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ExprKind::Deref { arg: self.mirror_expr(arg) }
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}
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}
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hir::ExprKind::Unary(hir::UnOp::Not, ref arg) => {
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if self.typeck_results().is_method_call(expr) {
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let arg = self.mirror_expr_inner(arg);
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self.overloaded_operator(expr, self.arena.alloc_from_iter(iter::once(arg)))
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} else {
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ExprKind::Unary { op: UnOp::Not, arg: self.mirror_expr(arg) }
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}
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}
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hir::ExprKind::Unary(hir::UnOp::Neg, ref arg) => {
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if self.typeck_results().is_method_call(expr) {
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let arg = self.mirror_expr_inner(arg);
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self.overloaded_operator(expr, self.arena.alloc_from_iter(iter::once(arg)))
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} else if let hir::ExprKind::Lit(ref lit) = arg.kind {
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ExprKind::Literal {
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literal: self.const_eval_literal(&lit.node, expr_ty, lit.span, true),
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user_ty: None,
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const_id: None,
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}
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} else {
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ExprKind::Unary { op: UnOp::Neg, arg: self.mirror_expr(arg) }
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}
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}
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hir::ExprKind::Struct(ref qpath, ref fields, ref base) => match expr_ty.kind() {
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ty::Adt(adt, substs) => match adt.adt_kind() {
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AdtKind::Struct | AdtKind::Union => {
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let user_provided_types = self.typeck_results().user_provided_types();
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let user_ty = user_provided_types.get(expr.hir_id).copied();
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debug!("make_mirror_unadjusted: (struct/union) user_ty={:?}", user_ty);
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ExprKind::Adt {
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adt_def: adt,
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variant_index: VariantIdx::new(0),
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substs,
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user_ty,
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fields: self.field_refs(fields),
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base: base.as_ref().map(|base| FruInfo {
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base: self.mirror_expr(base),
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field_types: self.arena.alloc_from_iter(
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self.typeck_results().fru_field_types()[expr.hir_id]
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.iter()
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.cloned(),
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),
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}),
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}
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}
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AdtKind::Enum => {
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let res = self.typeck_results().qpath_res(qpath, expr.hir_id);
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match res {
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Res::Def(DefKind::Variant, variant_id) => {
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assert!(base.is_none());
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let index = adt.variant_index_with_id(variant_id);
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let user_provided_types =
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self.typeck_results().user_provided_types();
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let user_ty = user_provided_types.get(expr.hir_id).copied();
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debug!("make_mirror_unadjusted: (variant) user_ty={:?}", user_ty);
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ExprKind::Adt {
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adt_def: adt,
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variant_index: index,
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substs,
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user_ty,
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fields: self.field_refs(fields),
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base: None,
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}
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}
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_ => {
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span_bug!(expr.span, "unexpected res: {:?}", res);
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}
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}
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}
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},
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_ => {
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span_bug!(expr.span, "unexpected type for struct literal: {:?}", expr_ty);
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}
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},
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hir::ExprKind::Closure(..) => {
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let closure_ty = self.typeck_results().expr_ty(expr);
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let (def_id, substs, movability) = match *closure_ty.kind() {
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ty::Closure(def_id, substs) => (def_id, UpvarSubsts::Closure(substs), None),
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ty::Generator(def_id, substs, movability) => {
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(def_id, UpvarSubsts::Generator(substs), Some(movability))
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}
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_ => {
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span_bug!(expr.span, "closure expr w/o closure type: {:?}", closure_ty);
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}
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};
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|
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let upvars = self.arena.alloc_from_iter(
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self.typeck_results
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|
.closure_min_captures_flattened(def_id)
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|
.zip(substs.upvar_tys())
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|
.map(|(captured_place, ty)| self.capture_upvar(expr, captured_place, ty)),
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);
|
|
ExprKind::Closure { closure_id: def_id, substs, upvars, movability }
|
|
}
|
|
|
|
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: self.mirror_expr(expr) }
|
|
}
|
|
hir::InlineAsmOperand::Out { reg, late, ref expr } => {
|
|
InlineAsmOperand::Out {
|
|
reg,
|
|
late,
|
|
expr: expr.as_ref().map(|expr| self.mirror_expr(expr)),
|
|
}
|
|
}
|
|
hir::InlineAsmOperand::InOut { reg, late, ref expr } => {
|
|
InlineAsmOperand::InOut { reg, late, expr: self.mirror_expr(expr) }
|
|
}
|
|
hir::InlineAsmOperand::SplitInOut {
|
|
reg,
|
|
late,
|
|
ref in_expr,
|
|
ref out_expr,
|
|
} => InlineAsmOperand::SplitInOut {
|
|
reg,
|
|
late,
|
|
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: self.mirror_expr(expr) }
|
|
}
|
|
hir::InlineAsmOperand::Sym { ref expr } => {
|
|
let qpath = match expr.kind {
|
|
hir::ExprKind::Path(ref qpath) => qpath,
|
|
_ => span_bug!(
|
|
expr.span,
|
|
"asm `sym` operand should be a path, found {:?}",
|
|
expr.kind
|
|
),
|
|
};
|
|
let temp_lifetime =
|
|
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 = self.typeck_results().node_type(expr.hir_id);
|
|
let user_ty = self.user_substs_applied_to_res(expr.hir_id, res);
|
|
InlineAsmOperand::SymFn {
|
|
expr: self.arena.alloc(Expr {
|
|
ty,
|
|
temp_lifetime,
|
|
span: expr.span,
|
|
kind: ExprKind::Literal {
|
|
literal: ty::Const::zero_sized(self.tcx, ty),
|
|
user_ty,
|
|
const_id: None,
|
|
},
|
|
}),
|
|
}
|
|
}
|
|
|
|
Res::Def(DefKind::Static, def_id) => {
|
|
InlineAsmOperand::SymStatic { def_id }
|
|
}
|
|
|
|
_ => {
|
|
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 = self.tcx.ty_error();
|
|
InlineAsmOperand::SymFn {
|
|
expr: self.arena.alloc(Expr {
|
|
ty,
|
|
temp_lifetime,
|
|
span: expr.span,
|
|
kind: ExprKind::Literal {
|
|
literal: ty::Const::zero_sized(self.tcx, ty),
|
|
user_ty: None,
|
|
const_id: None,
|
|
},
|
|
}),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
})),
|
|
options: asm.options,
|
|
line_spans: asm.line_spans,
|
|
},
|
|
|
|
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),
|
|
},
|
|
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),
|
|
},
|
|
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 {
|
|
// 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 source = if let Some((did, offset, var_ty)) = var {
|
|
let mk_const = |literal| {
|
|
self.arena.alloc(Expr {
|
|
temp_lifetime,
|
|
ty: var_ty,
|
|
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,
|
|
}
|
|
} else {
|
|
self.mirror_expr(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 = 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, user_ty: Some(*user_ty) }
|
|
} else {
|
|
cast
|
|
}
|
|
}
|
|
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,
|
|
},
|
|
}
|
|
}
|
|
|
|
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,
|
|
}
|
|
}
|
|
|
|
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),
|
|
|
|
_ => span_bug!(expr.span, "res `{:?}` not yet implemented", res),
|
|
}
|
|
}
|
|
|
|
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 }
|
|
}
|
|
}
|
|
|
|
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 }
|
|
}
|
|
|
|
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 },
|
|
});
|
|
|
|
// construct and return a deref wrapper `*foo()`
|
|
ExprKind::Deref { arg: ref_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 temp_lifetime = self.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: self.convert_var(var_hir_id),
|
|
};
|
|
|
|
for proj in captured_place.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 };
|
|
}
|
|
|
|
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),
|
|
},
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// 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),
|
|
}))
|
|
}
|
|
}
|
|
|
|
trait ToBorrowKind {
|
|
fn to_borrow_kind(&self) -> BorrowKind;
|
|
}
|
|
|
|
impl ToBorrowKind for AutoBorrowMutability {
|
|
fn to_borrow_kind(&self) -> BorrowKind {
|
|
use rustc_middle::ty::adjustment::AllowTwoPhase;
|
|
match *self {
|
|
AutoBorrowMutability::Mut { allow_two_phase_borrow } => BorrowKind::Mut {
|
|
allow_two_phase_borrow: match allow_two_phase_borrow {
|
|
AllowTwoPhase::Yes => true,
|
|
AllowTwoPhase::No => false,
|
|
},
|
|
},
|
|
AutoBorrowMutability::Not => BorrowKind::Shared,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ToBorrowKind for hir::Mutability {
|
|
fn to_borrow_kind(&self) -> BorrowKind {
|
|
match *self {
|
|
hir::Mutability::Mut => BorrowKind::Mut { allow_two_phase_borrow: false },
|
|
hir::Mutability::Not => BorrowKind::Shared,
|
|
}
|
|
}
|
|
}
|
|
|
|
fn bin_op(op: hir::BinOpKind) -> BinOp {
|
|
match op {
|
|
hir::BinOpKind::Add => BinOp::Add,
|
|
hir::BinOpKind::Sub => BinOp::Sub,
|
|
hir::BinOpKind::Mul => BinOp::Mul,
|
|
hir::BinOpKind::Div => BinOp::Div,
|
|
hir::BinOpKind::Rem => BinOp::Rem,
|
|
hir::BinOpKind::BitXor => BinOp::BitXor,
|
|
hir::BinOpKind::BitAnd => BinOp::BitAnd,
|
|
hir::BinOpKind::BitOr => BinOp::BitOr,
|
|
hir::BinOpKind::Shl => BinOp::Shl,
|
|
hir::BinOpKind::Shr => BinOp::Shr,
|
|
hir::BinOpKind::Eq => BinOp::Eq,
|
|
hir::BinOpKind::Lt => BinOp::Lt,
|
|
hir::BinOpKind::Le => BinOp::Le,
|
|
hir::BinOpKind::Ne => BinOp::Ne,
|
|
hir::BinOpKind::Ge => BinOp::Ge,
|
|
hir::BinOpKind::Gt => BinOp::Gt,
|
|
_ => bug!("no equivalent for ast binop {:?}", op),
|
|
}
|
|
}
|