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clean visit_expr

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This commit is contained in:
Ariel Ben-Yehuda 2015-04-14 21:14:42 +03:00
parent 6a95d90b86
commit 9e1a07883b
1 changed files with 30 additions and 31 deletions
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61
src/librustc_typeck/check/writeback.rs
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@ -85,6 +85,32 @@ impl<'cx, 'tcx> WritebackCx<'cx, 'tcx> {
fn tcx(&self) -> &'cx ty::ctxt<'tcx> {
self.fcx.tcx()
}
// Hacky hack: During type-checking, we treat *all* operators
// as potentially overloaded. But then, during writeback, if
// we observe that something like `a+b` is (known to be)
// operating on scalars, we clear the overload.
fn fix_scalar_binary_expr(&mut self, e: &ast::Expr) {
if let ast::ExprBinary(ref op, ref lhs, ref rhs) = e.node {
let lhs_ty = self.fcx.expr_ty(lhs.id);
let lhs_ty = self.fcx.infcx().resolve_type_vars_if_possible(&lhs_ty);
let rhs_ty = self.fcx.expr_ty(rhs.id);
let rhs_ty = self.fcx.infcx().resolve_type_vars_if_possible(&rhs_ty);
if ty::type_is_scalar(lhs_ty) && ty::type_is_scalar(rhs_ty) {
self.fcx.inh.method_map.borrow_mut().remove(&MethodCall::expr(e.id));
// weird but true: the by-ref binops put an
// adjustment on the lhs but not the rhs; the
// adjustment for rhs is kind of baked into the
// system.
if !ast_util::is_by_value_binop(op.node) {
self.fcx.inh.adjustments.borrow_mut().remove(&lhs.id);
}
}
}
}
}
///////////////////////////////////////////////////////////////////////////
@ -114,43 +140,16 @@ impl<'cx, 'tcx, 'v> Visitor<'v> for WritebackCx<'cx, 'tcx> {
return;
}
// Hacky hack: During type-checking, we treat *all* operators
// as potentially overloaded. But then, during writeback, if
// we observe that something like `a+b` is (known to be)
// operating on scalars, we clear the overload.
match e.node {
ast::ExprBinary(ref op, ref lhs, ref rhs) => {
let lhs_ty = self.fcx.expr_ty(lhs);
let lhs_ty = self.fcx.infcx().resolve_type_vars_if_possible(&lhs_ty);
let rhs_ty = self.fcx.expr_ty(rhs);
let rhs_ty = self.fcx.infcx().resolve_type_vars_if_possible(&rhs_ty);
if ty::type_is_scalar(lhs_ty) && ty::type_is_scalar(rhs_ty) {
self.fcx.inh.method_map.borrow_mut().remove(&MethodCall::expr(e.id));
// weird but true: the by-ref binops put an
// adjustment on the lhs but not the rhs; the
// adjustment for rhs is kind of baked into the
// system.
if !ast_util::is_by_value_binop(op.node) {
self.fcx.inh.adjustments.borrow_mut().remove(&lhs.id);
}
}
}
_ => { }
}
self.fix_scalar_binary_expr(e);
self.visit_node_id(ResolvingExpr(e.span), e.id);
self.visit_method_map_entry(ResolvingExpr(e.span),
MethodCall::expr(e.id));
match e.node {
ast::ExprClosure(_, ref decl, _) => {
for input in &decl.inputs {
let _ = self.visit_node_id(ResolvingExpr(e.span),
input.id);
}
if let ast::ExprClosure(_, ref decl, _) = e.node {
for input in &decl.inputs {
self.visit_node_id(ResolvingExpr(e.span), input.id);
}
_ => {}
}
visit::walk_expr(self, e);