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Auto merge of #40272 - jseyfried:fix_const_macro_invocations, r=petrochenkov 

macros: fix const expression invocations

Fixes #40136.
r? @nrc
This commit is contained in:
bors 2017-03-06 15:04:10 +00:00
parent 11bc48a15a 9fe7d3ffe4
commit b04ebef432
4 changed files with 45 additions and 21 deletions
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22
src/librustc/hir/map/def_collector.rs
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@ -26,7 +26,7 @@ pub struct DefCollector<'a> {
pub struct MacroInvocationData {
pub mark: Mark,
pub def_index: DefIndex,
pub const_integer: bool,
pub const_expr: bool,
}
impl<'a> DefCollector<'a> {
@ -65,10 +65,10 @@ impl<'a> DefCollector<'a> {
self.parent_def = parent;
}
pub fn visit_ast_const_integer(&mut self, expr: &Expr) {
pub fn visit_const_expr(&mut self, expr: &Expr) {
match expr.node {
// Find the node which will be used after lowering.
ExprKind::Paren(ref inner) => return self.visit_ast_const_integer(inner),
ExprKind::Paren(ref inner) => return self.visit_const_expr(inner),
ExprKind::Mac(..) => return self.visit_macro_invoc(expr.id, true),
// FIXME(eddyb) Closures should have separate
// function definition IDs and expression IDs.
@ -79,11 +79,11 @@ impl<'a> DefCollector<'a> {
self.create_def(expr.id, DefPathData::Initializer);
}
fn visit_macro_invoc(&mut self, id: NodeId, const_integer: bool) {
fn visit_macro_invoc(&mut self, id: NodeId, const_expr: bool) {
if let Some(ref mut visit) = self.visit_macro_invoc {
visit(MacroInvocationData {
mark: Mark::from_placeholder_id(id),
const_integer: const_integer,
const_expr: const_expr,
def_index: self.parent_def.unwrap(),
})
}
@ -142,7 +142,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
}
if let Some(ref expr) = v.node.disr_expr {
this.visit_ast_const_integer(expr);
this.visit_const_expr(expr);
}
});
}
@ -194,7 +194,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
let def = self.create_def(ti.id, def_data);
self.with_parent(def, |this| {
if let TraitItemKind::Const(_, Some(ref expr)) = ti.node {
this.create_def(expr.id, DefPathData::Initializer);
this.visit_const_expr(expr);
}
visit::walk_trait_item(this, ti);
@ -212,7 +212,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
let def = self.create_def(ii.id, def_data);
self.with_parent(def, |this| {
if let ImplItemKind::Const(_, ref expr) = ii.node {
this.create_def(expr.id, DefPathData::Initializer);
this.visit_const_expr(expr);
}
visit::walk_impl_item(this, ii);
@ -240,7 +240,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
match expr.node {
ExprKind::Mac(..) => return self.visit_macro_invoc(expr.id, false),
ExprKind::Repeat(_, ref count) => self.visit_ast_const_integer(count),
ExprKind::Repeat(_, ref count) => self.visit_const_expr(count),
ExprKind::Closure(..) => {
let def = self.create_def(expr.id, DefPathData::ClosureExpr);
self.parent_def = Some(def);
@ -255,11 +255,11 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
fn visit_ty(&mut self, ty: &'a Ty) {
match ty.node {
TyKind::Mac(..) => return self.visit_macro_invoc(ty.id, false),
TyKind::Array(_, ref length) => self.visit_ast_const_integer(length),
TyKind::Array(_, ref length) => self.visit_const_expr(length),
TyKind::ImplTrait(..) => {
self.create_def(ty.id, DefPathData::ImplTrait);
}
TyKind::Typeof(ref expr) => self.visit_ast_const_integer(expr),
TyKind::Typeof(ref expr) => self.visit_const_expr(expr),
_ => {}
}
visit::walk_ty(self, ty);

2
src/librustc_resolve/build_reduced_graph.rs
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@ -511,7 +511,7 @@ impl<'a> Resolver<'a> {
let invocation = self.arenas.alloc_invocation_data(InvocationData {
module: Cell::new(self.get_extern_crate_root(def_id.krate)),
def_index: CRATE_DEF_INDEX,
const_integer: false,
const_expr: false,
legacy_scope: Cell::new(LegacyScope::Empty),
expansion: Cell::new(LegacyScope::Empty),
});

18
src/librustc_resolve/macros.rs
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@ -40,9 +40,9 @@ use syntax_pos::{Span, DUMMY_SP};
pub struct InvocationData<'a> {
pub module: Cell<Module<'a>>,
pub def_index: DefIndex,
// True if this expansion is in a `const_integer` position, for example `[u32; m!()]`.
// c.f. `DefCollector::visit_ast_const_integer`.
pub const_integer: bool,
// True if this expansion is in a `const_expr` position, for example `[u32; m!()]`.
// c.f. `DefCollector::visit_const_expr`.
pub const_expr: bool,
// The scope in which the invocation path is resolved.
pub legacy_scope: Cell<LegacyScope<'a>>,
// The smallest scope that includes this invocation's expansion,
@ -55,7 +55,7 @@ impl<'a> InvocationData<'a> {
InvocationData {
module: Cell::new(graph_root),
def_index: CRATE_DEF_INDEX,
const_integer: false,
const_expr: false,
legacy_scope: Cell::new(LegacyScope::Empty),
expansion: Cell::new(LegacyScope::Empty),
}
@ -93,7 +93,7 @@ impl<'a> base::Resolver for Resolver<'a> {
self.invocations.insert(mark, self.arenas.alloc_invocation_data(InvocationData {
module: Cell::new(module),
def_index: module.def_id().unwrap().index,
const_integer: false,
const_expr: false,
legacy_scope: Cell::new(LegacyScope::Empty),
expansion: Cell::new(LegacyScope::Empty),
}));
@ -517,13 +517,13 @@ impl<'a> Resolver<'a> {
fn collect_def_ids(&mut self, invocation: &'a InvocationData<'a>, expansion: &Expansion) {
let Resolver { ref mut invocations, arenas, graph_root, .. } = *self;
let InvocationData { def_index, const_integer, .. } = *invocation;
let InvocationData { def_index, const_expr, .. } = *invocation;
let visit_macro_invoc = &mut |invoc: map::MacroInvocationData| {
invocations.entry(invoc.mark).or_insert_with(|| {
arenas.alloc_invocation_data(InvocationData {
def_index: invoc.def_index,
const_integer: invoc.const_integer,
const_expr: invoc.const_expr,
module: Cell::new(graph_root),
expansion: Cell::new(LegacyScope::Empty),
legacy_scope: Cell::new(LegacyScope::Empty),
@ -534,9 +534,9 @@ impl<'a> Resolver<'a> {
let mut def_collector = DefCollector::new(&mut self.definitions);
def_collector.visit_macro_invoc = Some(visit_macro_invoc);
def_collector.with_parent(def_index, |def_collector| {
if const_integer {
if const_expr {
if let Expansion::Expr(ref expr) = *expansion {
def_collector.visit_ast_const_integer(expr);
def_collector.visit_const_expr(expr);
}
}
expansion.visit_with(def_collector)

24
src/test/run-pass/issue-40136.rs Normal file
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@ -0,0 +1,24 @@
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![feature(associated_consts)]
macro_rules! m { () => { 0 } }
trait T {
const C: i32 = m!();
}
struct S;
impl S {
const C: i32 = m!();
}
fn main() {}