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Auto merge of #40220 - jseyfried:ast_macro_def, r=nrc 

syntax: add `ast::ItemKind::MacroDef`, simplify hygiene info

This PR
 - adds a new variant `MacroDef` to `ast::ItemKind` for `macro_rules!` and eventually `macro` items,
 - [breaking-change] forbids macro defs without a name (`macro_rules! { () => {} }` compiles today),
 - removes `ast::MacroDef`, and
 - no longer uses `Mark` and `Invocation` to identify and characterize macro definitions.
   - We used to apply (at least) two `Mark`s to an expanded identifier's `SyntaxContext` -- the definition mark(s) and the expansion mark(s). We now only apply the latter.

r? @nrc
This commit is contained in:
bors 2017-03-11 22:48:14 +00:00
parent e4eb964dd9 8c98996934
commit 1b19284ad9
25 changed files with 305 additions and 316 deletions
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51
src/librustc/hir/lowering.rs
View File

@ -79,6 +79,7 @@ pub struct LoweringContext<'a> {
trait_items: BTreeMap<hir::TraitItemId, hir::TraitItem>,
impl_items: BTreeMap<hir::ImplItemId, hir::ImplItem>,
bodies: BTreeMap<hir::BodyId, hir::Body>,
exported_macros: Vec<hir::MacroDef>,
trait_impls: BTreeMap<DefId, Vec<NodeId>>,
trait_default_impl: BTreeMap<DefId, NodeId>,
@ -121,6 +122,7 @@ pub fn lower_crate(sess: &Session,
bodies: BTreeMap::new(),
trait_impls: BTreeMap::new(),
trait_default_impl: BTreeMap::new(),
exported_macros: Vec::new(),
loop_scopes: Vec::new(),
is_in_loop_condition: false,
type_def_lifetime_params: DefIdMap(),
@ -170,9 +172,10 @@ impl<'a> LoweringContext<'a> {
impl<'lcx, 'interner> Visitor<'lcx> for ItemLowerer<'lcx, 'interner> {
fn visit_item(&mut self, item: &'lcx Item) {
let hir_item = self.lctx.lower_item(item);
self.lctx.items.insert(item.id, hir_item);
visit::walk_item(self, item);
if let Some(hir_item) = self.lctx.lower_item(item) {
self.lctx.items.insert(item.id, hir_item);
visit::walk_item(self, item);
}
}
fn visit_trait_item(&mut self, item: &'lcx TraitItem) {
@ -195,14 +198,13 @@ impl<'a> LoweringContext<'a> {
let module = self.lower_mod(&c.module);
let attrs = self.lower_attrs(&c.attrs);
let exported_macros = c.exported_macros.iter().map(|m| self.lower_macro_def(m)).collect();
let body_ids = body_ids(&self.bodies);
hir::Crate {
module: module,
attrs: attrs,
span: c.span,
exported_macros: exported_macros,
exported_macros: hir::HirVec::from(self.exported_macros),
items: self.items,
trait_items: self.trait_items,
impl_items: self.impl_items,
@ -1134,7 +1136,7 @@ impl<'a> LoweringContext<'a> {
bounds,
items)
}
ItemKind::Mac(_) => panic!("Shouldn't still be around"),
ItemKind::MacroDef(..) | ItemKind::Mac(..) => panic!("Shouldn't still be around"),
}
}
@ -1256,42 +1258,45 @@ impl<'a> LoweringContext<'a> {
}
}
fn lower_macro_def(&mut self, m: &MacroDef) -> hir::MacroDef {
hir::MacroDef {
name: m.ident.name,
attrs: self.lower_attrs(&m.attrs),
id: m.id,
span: m.span,
body: m.body.clone().into(),
}
}
fn lower_item_id(&mut self, i: &Item) -> SmallVector<hir::ItemId> {
if let ItemKind::Use(ref view_path) = i.node {
if let ViewPathList(_, ref imports) = view_path.node {
return iter::once(i.id).chain(imports.iter().map(|import| import.node.id))
.map(|id| hir::ItemId { id: id }).collect();
match i.node {
ItemKind::Use(ref view_path) => {
if let ViewPathList(_, ref imports) = view_path.node {
return iter::once(i.id).chain(imports.iter().map(|import| import.node.id))
.map(|id| hir::ItemId { id: id }).collect();
}
}
ItemKind::MacroDef(..) => return SmallVector::new(),
_ => {}
}
SmallVector::one(hir::ItemId { id: i.id })
}
pub fn lower_item(&mut self, i: &Item) -> hir::Item {
pub fn lower_item(&mut self, i: &Item) -> Option<hir::Item> {
let mut name = i.ident.name;
let attrs = self.lower_attrs(&i.attrs);
let mut vis = self.lower_visibility(&i.vis);
if let ItemKind::MacroDef(ref tts) = i.node {
if i.attrs.iter().any(|attr| attr.name() == "macro_export") {
self.exported_macros.push(hir::MacroDef {
name: name, attrs: attrs, id: i.id, span: i.span, body: tts.clone().into(),
});
}
return None;
}
let node = self.with_parent_def(i.id, |this| {
this.lower_item_kind(i.id, &mut name, &attrs, &mut vis, &i.node)
});
hir::Item {
Some(hir::Item {
id: i.id,
name: name,
attrs: attrs,
node: node,
vis: vis,
span: i.span,
}
})
}
fn lower_foreign_item(&mut self, i: &ForeignItem) -> hir::ForeignItem {

6
src/librustc/hir/map/def_collector.rs
View File

@ -108,7 +108,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
ItemKind::Mod(..) => DefPathData::Module(i.ident.name.as_str()),
ItemKind::Static(..) | ItemKind::Const(..) | ItemKind::Fn(..) =>
DefPathData::ValueNs(i.ident.name.as_str()),
ItemKind::Mac(..) if i.id == DUMMY_NODE_ID => return, // Scope placeholder
ItemKind::MacroDef(..) => DefPathData::MacroDef(i.ident.name.as_str()),
ItemKind::Mac(..) => return self.visit_macro_invoc(i.id, false),
ItemKind::Use(ref view_path) => {
match view_path.node {
@ -269,10 +269,6 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
self.create_def(def.lifetime.id, DefPathData::LifetimeDef(def.lifetime.name.as_str()));
}
fn visit_macro_def(&mut self, macro_def: &'a MacroDef) {
self.create_def(macro_def.id, DefPathData::MacroDef(macro_def.ident.name.as_str()));
}
fn visit_stmt(&mut self, stmt: &'a Stmt) {
match stmt.node {
StmtKind::Mac(..) => self.visit_macro_invoc(stmt.id, false),

2
src/librustc/middle/cstore.rs
View File

@ -136,7 +136,7 @@ pub struct NativeLibrary {
}
pub enum LoadedMacro {
MacroRules(ast::MacroDef),
MacroDef(ast::Item),
ProcMacro(Rc<SyntaxExtension>),
}

3
src/librustc_driver/driver.rs
View File

@ -43,7 +43,6 @@ use super::Compilation;
use serialize::json;
use std::env;
use std::mem;
use std::ffi::{OsString, OsStr};
use std::fs;
use std::io::{self, Write};
@ -708,8 +707,6 @@ pub fn phase_2_configure_and_expand<F>(sess: &Session,
krate
});
krate.exported_macros = mem::replace(&mut resolver.exported_macros, Vec::new());
krate = time(time_passes, "maybe building test harness", || {
syntax::test::modify_for_testing(&sess.parse_sess,
&mut resolver,

5
src/librustc_metadata/cstore_impl.rs
View File

@ -414,12 +414,13 @@ impl CrateStore for cstore::CStore {
sess.imported_macro_spans.borrow_mut()
.insert(local_span, (name.to_string(), data.get_span(id.index, sess)));
LoadedMacro::MacroRules(ast::MacroDef {
LoadedMacro::MacroDef(ast::Item {
ident: ast::Ident::with_empty_ctxt(name),
id: ast::DUMMY_NODE_ID,
span: local_span,
attrs: attrs,
body: body.into(),
node: ast::ItemKind::MacroDef(body.into()),
vis: ast::Visibility::Inherited,
})
}

5
src/librustc_passes/hir_stats.rs
View File

@ -375,9 +375,4 @@ impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> {
fn visit_attribute(&mut self, attr: &'v ast::Attribute) {
self.record("Attribute", Id::None, attr);
}
fn visit_macro_def(&mut self, macro_def: &'v ast::MacroDef) {
self.record("MacroDef", Id::None, macro_def);
ast_visit::walk_macro_def(self, macro_def)
}
}

41
src/librustc_resolve/build_reduced_graph.rs
View File

@ -37,7 +37,6 @@ use syntax::ast::{Mutability, StmtKind, TraitItem, TraitItemKind};
use syntax::ast::{Variant, ViewPathGlob, ViewPathList, ViewPathSimple};
use syntax::ext::base::SyntaxExtension;
use syntax::ext::base::Determinacy::Undetermined;
use syntax::ext::expand::mark_tts;
use syntax::ext::hygiene::Mark;
use syntax::ext::tt::macro_rules;
use syntax::parse::token;
@ -373,7 +372,7 @@ impl<'a> Resolver<'a> {
self.define(parent, ident, TypeNS, (module, vis, sp, expansion));
self.current_module = module;
}
ItemKind::Mac(_) => panic!("unexpanded macro in resolve!"),
ItemKind::MacroDef(..) | ItemKind::Mac(_) => unreachable!(),
}
}
@ -493,6 +492,16 @@ impl<'a> Resolver<'a> {
})
}
pub fn macro_def_scope(&mut self, expansion: Mark) -> Module<'a> {
let def_id = self.macro_defs[&expansion];
if let Some(id) = self.definitions.as_local_node_id(def_id) {
self.local_macro_def_scopes[&id]
} else {
let module_def_id = ty::DefIdTree::parent(&*self, def_id).unwrap();
self.get_extern_crate_root(module_def_id.krate)
}
}
pub fn get_macro(&mut self, def: Def) -> Rc<SyntaxExtension> {
let def_id = match def {
Def::Macro(def_id, ..) => def_id,
@ -502,22 +511,12 @@ impl<'a> Resolver<'a> {
return ext.clone();
}
let mut macro_rules = match self.session.cstore.load_macro(def_id, &self.session) {
LoadedMacro::MacroRules(macro_rules) => macro_rules,
let macro_def = match self.session.cstore.load_macro(def_id, &self.session) {
LoadedMacro::MacroDef(macro_def) => macro_def,
LoadedMacro::ProcMacro(ext) => return ext,
};
let mark = Mark::fresh();
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_expr: false,
legacy_scope: Cell::new(LegacyScope::Empty),
expansion: Cell::new(LegacyScope::Empty),
});
self.invocations.insert(mark, invocation);
macro_rules.body = mark_tts(macro_rules.stream(), mark).into();
let ext = Rc::new(macro_rules::compile(&self.session.parse_sess, &macro_rules));
let ext = Rc::new(macro_rules::compile(&self.session.parse_sess, &macro_def));
self.macro_map.insert(def_id, ext.clone());
ext
}
@ -707,12 +706,12 @@ impl<'a, 'b> Visitor<'a> for BuildReducedGraphVisitor<'a, 'b> {
fn visit_item(&mut self, item: &'a Item) {
let macro_use = match item.node {
ItemKind::Mac(ref mac) => {
if mac.node.path.segments.is_empty() {
self.legacy_scope = LegacyScope::Expansion(self.visit_invoc(item.id));
} else {
self.resolver.define_macro(item, &mut self.legacy_scope);
}
ItemKind::MacroDef(..) => {
self.resolver.define_macro(item, &mut self.legacy_scope);
return
}
ItemKind::Mac(..) => {
self.legacy_scope = LegacyScope::Expansion(self.visit_invoc(item.id));
return
}
ItemKind::Mod(..) => self.resolver.contains_macro_use(&item.attrs),

68
src/librustc_resolve/lib.rs
View File

@ -779,8 +779,8 @@ enum RibKind<'a> {
// We passed through a module.
ModuleRibKind(Module<'a>),
// We passed through a `macro_rules!` statement with the given expansion
MacroDefinition(Mark),
// We passed through a `macro_rules!` statement
MacroDefinition(DefId),
// All bindings in this rib are type parameters that can't be used
// from the default of a type parameter because they're not declared
@ -997,14 +997,18 @@ impl<'a> NameBinding<'a> {
}
}
fn get_macro(&self, resolver: &mut Resolver<'a>) -> Rc<SyntaxExtension> {
fn def_ignoring_ambiguity(&self) -> Def {
match self.kind {
NameBindingKind::Import { binding, .. } => binding.get_macro(resolver),
NameBindingKind::Ambiguity { b1, .. } => b1.get_macro(resolver),
_ => resolver.get_macro(self.def()),
NameBindingKind::Import { binding, .. } => binding.def_ignoring_ambiguity(),
NameBindingKind::Ambiguity { b1, .. } => b1.def_ignoring_ambiguity(),
_ => self.def(),
}
}
fn get_macro(&self, resolver: &mut Resolver<'a>) -> Rc<SyntaxExtension> {
resolver.get_macro(self.def_ignoring_ambiguity())
}
// We sometimes need to treat variants as `pub` for backwards compatibility
fn pseudo_vis(&self) -> ty::Visibility {
if self.is_variant() { ty::Visibility::Public } else { self.vis }
@ -1092,10 +1096,6 @@ pub struct Resolver<'a> {
pub definitions: Definitions,
// Maps the node id of a statement to the expansions of the `macro_rules!`s
// immediately above the statement (if appropriate).
macros_at_scope: FxHashMap<NodeId, Vec<Mark>>,
graph_root: Module<'a>,
prelude: Option<Module<'a>>,
@ -1171,12 +1171,13 @@ pub struct Resolver<'a> {
dummy_binding: &'a NameBinding<'a>,
use_extern_macros: bool, // true if `#![feature(use_extern_macros)]`
pub exported_macros: Vec<ast::MacroDef>,
crate_loader: &'a mut CrateLoader,
macro_names: FxHashSet<Name>,
builtin_macros: FxHashMap<Name, &'a NameBinding<'a>>,
lexical_macro_resolutions: Vec<(Name, &'a Cell<LegacyScope<'a>>)>,
macro_map: FxHashMap<DefId, Rc<SyntaxExtension>>,
macro_defs: FxHashMap<Mark, DefId>,
local_macro_def_scopes: FxHashMap<NodeId, Module<'a>>,
macro_exports: Vec<Export>,
pub whitelisted_legacy_custom_derives: Vec<Name>,
pub found_unresolved_macro: bool,
@ -1305,11 +1306,13 @@ impl<'a> Resolver<'a> {
let features = session.features.borrow();
let mut macro_defs = FxHashMap();
macro_defs.insert(Mark::root(), root_def_id);
Resolver {
session: session,
definitions: definitions,
macros_at_scope: FxHashMap(),
// The outermost module has def ID 0; this is not reflected in the
// AST.
@ -1365,7 +1368,6 @@ impl<'a> Resolver<'a> {
// `#![feature(proc_macro)]` implies `#[feature(extern_macros)]`
use_extern_macros: features.use_extern_macros || features.proc_macro,
exported_macros: Vec::new(),
crate_loader: crate_loader,
macro_names: FxHashSet(),
builtin_macros: FxHashMap(),
@ -1373,6 +1375,8 @@ impl<'a> Resolver<'a> {
macro_map: FxHashMap(),
macro_exports: Vec::new(),
invocations: invocations,
macro_defs: macro_defs,
local_macro_def_scopes: FxHashMap(),
name_already_seen: FxHashMap(),
whitelisted_legacy_custom_derives: Vec::new(),
proc_macro_enabled: features.proc_macro,
@ -1510,12 +1514,12 @@ impl<'a> Resolver<'a> {
}
}
if let MacroDefinition(mac) = self.ribs[ns][i].kind {
if let MacroDefinition(def) = self.ribs[ns][i].kind {
// If an invocation of this macro created `ident`, give up on `ident`
// and switch to `ident`'s source from the macro definition.
let (source_ctxt, source_macro) = ident.ctxt.source();
if source_macro == mac {
ident.ctxt = source_ctxt;
let ctxt_data = ident.ctxt.data();
if def == self.macro_defs[&ctxt_data.outer_mark] {
ident.ctxt = ctxt_data.prev_ctxt;
}
}
}
@ -1523,11 +1527,12 @@ impl<'a> Resolver<'a> {
None
}
fn resolve_crate_var(&mut self, mut crate_var_ctxt: SyntaxContext) -> Module<'a> {
while crate_var_ctxt.source().0 != SyntaxContext::empty() {
crate_var_ctxt = crate_var_ctxt.source().0;
fn resolve_crate_var(&mut self, crate_var_ctxt: SyntaxContext) -> Module<'a> {
let mut ctxt_data = crate_var_ctxt.data();
while ctxt_data.prev_ctxt != SyntaxContext::empty() {
ctxt_data = ctxt_data.prev_ctxt.data();
}
let module = self.invocations[&crate_var_ctxt.source().1].module.get();
let module = self.macro_def_scope(ctxt_data.outer_mark);
if module.is_local() { self.graph_root } else { module }
}
@ -1579,12 +1584,12 @@ impl<'a> Resolver<'a> {
NormalRibKind => {
// Continue
}
MacroDefinition(mac) => {
MacroDefinition(def) => {
// If an invocation of this macro created `ident`, give up on `ident`
// and switch to `ident`'s source from the macro definition.
let (source_ctxt, source_macro) = ident.ctxt.source();
if source_macro == mac {
ident.ctxt = source_ctxt;
let ctxt_data = ident.ctxt.data();
if def == self.macro_defs[&ctxt_data.outer_mark] {
ident.ctxt = ctxt_data.prev_ctxt;
}
}
_ => {
@ -1696,7 +1701,7 @@ impl<'a> Resolver<'a> {
}
}
ItemKind::ExternCrate(_) => {
ItemKind::ExternCrate(_) | ItemKind::MacroDef(..) => {
// do nothing, these are just around to be encoded
}
@ -2031,11 +2036,12 @@ impl<'a> Resolver<'a> {
// Descend into the block.
for stmt in &block.stmts {
if let Some(marks) = self.macros_at_scope.remove(&stmt.id) {
num_macro_definition_ribs += marks.len() as u32;
for mark in marks {
self.ribs[ValueNS].push(Rib::new(MacroDefinition(mark)));
self.label_ribs.push(Rib::new(MacroDefinition(mark)));
if let ast::StmtKind::Item(ref item) = stmt.node {
if let ast::ItemKind::MacroDef(..) = item.node {
num_macro_definition_ribs += 1;
let def = self.definitions.local_def_id(item.id);
self.ribs[ValueNS].push(Rib::new(MacroDefinition(def)));
self.label_ribs.push(Rib::new(MacroDefinition(def)));
}
}

162
src/librustc_resolve/macros.rs
View File

@ -17,25 +17,26 @@ use rustc::hir::def_id::{DefId, BUILTIN_MACROS_CRATE, CRATE_DEF_INDEX, DefIndex}
use rustc::hir::def::{Def, Export};
use rustc::hir::map::{self, DefCollector};
use rustc::ty;
use std::cell::Cell;
use std::rc::Rc;
use syntax::ast::{self, Name, Ident};
use syntax::attr;
use syntax::attr::{self, HasAttrs};
use syntax::errors::DiagnosticBuilder;
use syntax::ext::base::{self, Determinacy, MultiModifier, MultiDecorator};
use syntax::ext::base::{Resolver as SyntaxResolver, SyntaxExtension};
use syntax::ext::base::MacroKind;
use syntax::ext::expand::{Expansion, mark_tts};
use syntax::ext::base::{self, Annotatable, Determinacy, MultiModifier, MultiDecorator};
use syntax::ext::base::{MacroKind, SyntaxExtension, Resolver as SyntaxResolver};
use syntax::ext::expand::{Expansion, ExpansionKind, Invocation, InvocationKind, find_attr_invoc};
use syntax::ext::hygiene::Mark;
use syntax::ext::placeholders::placeholder;
use syntax::ext::tt::macro_rules;
use syntax::feature_gate::{self, emit_feature_err, GateIssue};
use syntax::fold::{self, Folder};
use syntax::ptr::P;
use syntax::symbol::{Symbol, keywords};
use syntax::util::lev_distance::find_best_match_for_name;
use syntax::visit::Visitor;
use syntax_pos::{Span, DUMMY_SP};
use std::cell::Cell;
use std::mem;
use std::rc::Rc;
#[derive(Clone)]
pub struct InvocationData<'a> {
pub module: Cell<Module<'a>>,
@ -73,7 +74,7 @@ pub enum LegacyScope<'a> {
pub struct LegacyBinding<'a> {
pub parent: Cell<LegacyScope<'a>>,
pub name: ast::Name,
ext: Rc<SyntaxExtension>,
def_id: DefId,
pub span: Span,
}
@ -151,7 +152,7 @@ impl<'a> base::Resolver for Resolver<'a> {
invocation.expansion.set(visitor.legacy_scope);
}
fn add_ext(&mut self, ident: ast::Ident, ext: Rc<SyntaxExtension>) {
fn add_builtin(&mut self, ident: ast::Ident, ext: Rc<SyntaxExtension>) {
let def_id = DefId {
krate: BUILTIN_MACROS_CRATE,
index: DefIndex::new(self.macro_map.len()),
@ -167,10 +168,6 @@ impl<'a> base::Resolver for Resolver<'a> {
self.builtin_macros.insert(ident.name, binding);
}
fn add_expansions_at_stmt(&mut self, id: ast::NodeId, macros: Vec<Mark>) {
self.macros_at_scope.insert(id, macros);
}
fn resolve_imports(&mut self) {
ImportResolver { resolver: self }.resolve_imports()
}
@ -240,8 +237,83 @@ impl<'a> base::Resolver for Resolver<'a> {
None
}
fn resolve_macro(&mut self, scope: Mark, path: &ast::Path, kind: MacroKind,
force: bool) -> Result<Rc<SyntaxExtension>, Determinacy> {
fn resolve_invoc(&mut self, invoc: &mut Invocation, scope: Mark, force: bool)
-> Result<Option<Rc<SyntaxExtension>>, Determinacy> {
let def = match invoc.kind {
InvocationKind::Attr { attr: None, .. } => return Ok(None),
_ => match self.resolve_invoc_to_def(invoc, scope, force) {
Ok(def) => def,
Err(determinacy) => return Err(determinacy),
},
};
self.macro_defs.insert(invoc.expansion_data.mark, def.def_id());
Ok(Some(self.get_macro(def)))
}
fn resolve_macro(&mut self, scope: Mark, path: &ast::Path, kind: MacroKind, force: bool)
-> Result<Rc<SyntaxExtension>, Determinacy> {
self.resolve_macro_to_def(scope, path, kind, force).map(|def| self.get_macro(def))
}
}
impl<'a> Resolver<'a> {
fn resolve_invoc_to_def(&mut self, invoc: &mut Invocation, scope: Mark, force: bool)
-> Result<Def, Determinacy> {
let (attr, traits, item) = match invoc.kind {
InvocationKind::Attr { ref mut attr, ref traits, ref mut item } => (attr, traits, item),
InvocationKind::Bang { ref mac, .. } => {
return self.resolve_macro_to_def(scope, &mac.node.path, MacroKind::Bang, force);
}
InvocationKind::Derive { name, span, .. } => {
let path = ast::Path::from_ident(span, Ident::with_empty_ctxt(name));
return self.resolve_macro_to_def(scope, &path, MacroKind::Derive, force);
}
};
let (attr_name, path) = {
let attr = attr.as_ref().unwrap();
(attr.name(), ast::Path::from_ident(attr.span, Ident::with_empty_ctxt(attr.name())))
};
let mut determined = true;
match self.resolve_macro_to_def(scope, &path, MacroKind::Attr, force) {
Ok(def) => return Ok(def),
Err(Determinacy::Undetermined) => determined = false,
Err(Determinacy::Determined) if force => return Err(Determinacy::Determined),
Err(Determinacy::Determined) => {}
}
for &(name, span) in traits {
let path = ast::Path::from_ident(span, Ident::with_empty_ctxt(name));
match self.resolve_macro(scope, &path, MacroKind::Derive, force) {
Ok(ext) => if let SyntaxExtension::ProcMacroDerive(_, ref inert_attrs) = *ext {
if inert_attrs.contains(&attr_name) {
// FIXME(jseyfried) Avoid `mem::replace` here.
let dummy_item = placeholder(ExpansionKind::Items, ast::DUMMY_NODE_ID)
.make_items().pop().unwrap();
let dummy_item = Annotatable::Item(dummy_item);
*item = mem::replace(item, dummy_item).map_attrs(|mut attrs| {
let inert_attr = attr.take().unwrap();
attr::mark_known(&inert_attr);
if self.proc_macro_enabled {
*attr = find_attr_invoc(&mut attrs);
}
attrs.push(inert_attr);
attrs
});
}
return Err(Determinacy::Undetermined);
},
Err(Determinacy::Undetermined) => determined = false,
Err(Determinacy::Determined) => {}
}
}
Err(if determined { Determinacy::Determined } else { Determinacy::Undetermined })
}
fn resolve_macro_to_def(&mut self, scope: Mark, path: &ast::Path, kind: MacroKind, force: bool)
-> Result<Def, Determinacy> {
let ast::Path { ref segments, span } = *path;
if segments.iter().any(|segment| segment.parameters.is_some()) {
let kind =
@ -264,10 +336,10 @@ impl<'a> base::Resolver for Resolver<'a> {
return Err(Determinacy::Determined);
}
let ext = match self.resolve_path(&path, Some(MacroNS), None) {
let def = match self.resolve_path(&path, Some(MacroNS), None) {
PathResult::NonModule(path_res) => match path_res.base_def() {
Def::Err => Err(Determinacy::Determined),
def @ _ => Ok(self.get_macro(def)),
def @ _ => Ok(def),
},
PathResult::Module(..) => unreachable!(),
PathResult::Indeterminate if !force => return Err(Determinacy::Undetermined),
@ -278,15 +350,15 @@ impl<'a> base::Resolver for Resolver<'a> {
};
self.current_module.macro_resolutions.borrow_mut()
.push((path.into_boxed_slice(), span));
return ext;
return def;
}
let name = path[0].name;
let result = match self.resolve_legacy_scope(&invocation.legacy_scope, name, false) {
Some(MacroBinding::Legacy(binding)) => Ok(binding.ext.clone()),
Some(MacroBinding::Modern(binding)) => Ok(binding.get_macro(self)),
Some(MacroBinding::Legacy(binding)) => Ok(Def::Macro(binding.def_id, MacroKind::Bang)),
Some(MacroBinding::Modern(binding)) => Ok(binding.def_ignoring_ambiguity()),
None => match self.resolve_lexical_macro_path_segment(path[0], MacroNS, None) {
Ok(binding) => Ok(binding.get_macro(self)),
Ok(binding) => Ok(binding.def_ignoring_ambiguity()),
Err(Determinacy::Undetermined) if !force =>
return Err(Determinacy::Undetermined),
Err(_) => {
@ -301,9 +373,7 @@ impl<'a> base::Resolver for Resolver<'a> {
result
}
}
impl<'a> Resolver<'a> {
// Resolve the initial segment of a non-global macro path (e.g. `foo` in `foo::bar!();`)
pub fn resolve_lexical_macro_path_segment(&mut self,
ident: Ident,
@ -544,45 +614,23 @@ impl<'a> Resolver<'a> {
}
pub fn define_macro(&mut self, item: &ast::Item, legacy_scope: &mut LegacyScope<'a>) {
let tts = match item.node {
ast::ItemKind::Mac(ref mac) => mac.node.stream(),
_ => unreachable!(),
};
if item.ident.name == "macro_rules" {
self.local_macro_def_scopes.insert(item.id, self.current_module);
let ident = item.ident;
if ident.name == "macro_rules" {
self.session.span_err(item.span, "user-defined macros may not be named `macro_rules`");
}
let mark = Mark::from_placeholder_id(item.id);
let invocation = self.invocations[&mark];
invocation.module.set(self.current_module);
let mut def = ast::MacroDef {
ident: item.ident,
attrs: item.attrs.clone(),
id: ast::DUMMY_NODE_ID,
span: item.span,
body: mark_tts(tts, mark).into(),
};
let def_id = self.definitions.local_def_id(item.id);
let ext = Rc::new(macro_rules::compile(&self.session.parse_sess, item));
self.macro_map.insert(def_id, ext);
*legacy_scope = LegacyScope::Binding(self.arenas.alloc_legacy_binding(LegacyBinding {
parent: Cell::new(*legacy_scope),
name: def.ident.name,
ext: Rc::new(macro_rules::compile(&self.session.parse_sess, &def)),
span: def.span,
parent: Cell::new(*legacy_scope), name: ident.name, def_id: def_id, span: item.span,
}));
self.macro_names.insert(def.ident.name);
self.macro_names.insert(ident.name);
if attr::contains_name(&def.attrs, "macro_export") {
def.id = self.next_node_id();
DefCollector::new(&mut self.definitions).with_parent(CRATE_DEF_INDEX, |collector| {
collector.visit_macro_def(&def)
});
self.macro_exports.push(Export {
name: def.ident.name,
def: Def::Macro(self.definitions.local_def_id(def.id), MacroKind::Bang),
});
self.exported_macros.push(def);
if attr::contains_name(&item.attrs, "macro_export") {
let def = Def::Macro(def_id, MacroKind::Bang);
self.macro_exports.push(Export { name: ident.name, def: def });
}
}

12
src/librustdoc/visit_ast.rs
View File

@ -16,6 +16,7 @@ use std::mem;
use syntax::abi;
use syntax::ast;
use syntax::attr;
use syntax::tokenstream::TokenStream;
use syntax_pos::Span;
use rustc::hir::map as hir_map;
@ -205,14 +206,17 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
}
let imported_from = self.cx.sess().cstore.original_crate_name(def_id.krate);
let def = match self.cx.sess().cstore.load_macro(def_id, self.cx.sess()) {
LoadedMacro::MacroRules(macro_rules) => macro_rules,
LoadedMacro::MacroDef(macro_def) => macro_def,
// FIXME(jseyfried): document proc macro reexports
LoadedMacro::ProcMacro(..) => continue,
};
// FIXME(jseyfried) merge with `self.visit_macro()`
let tts = def.stream().trees().collect::<Vec<_>>();
let matchers = tts.chunks(4).map(|arm| arm[0].span()).collect();
let matchers = if let ast::ItemKind::MacroDef(ref tokens) = def.node {
let tts: Vec<_> = TokenStream::from(tokens.clone()).into_trees().collect();
tts.chunks(4).map(|arm| arm[0].span()).collect()
} else {
unreachable!()
};
om.macros.push(Macro {
def_id: def_id,
attrs: def.attrs.clone().into(),

25
src/libsyntax/ast.rs
View File

@ -414,7 +414,6 @@ pub struct Crate {
pub module: Mod,
pub attrs: Vec<Attribute>,
pub span: Span,
pub exported_macros: Vec<MacroDef>,
}
/// A spanned compile-time attribute list item.
@ -1855,10 +1854,13 @@ pub enum ItemKind {
Option<TraitRef>, // (optional) trait this impl implements
P<Ty>, // self
Vec<ImplItem>),
/// A macro invocation (which includes macro definition).
/// A macro invocation.
///
/// E.g. `macro_rules! foo { .. }` or `foo!(..)`
Mac(Mac),
/// A macro definition.
MacroDef(ThinTokenStream),
}
impl ItemKind {
@ -1877,6 +1879,7 @@ impl ItemKind {
ItemKind::Union(..) => "union",
ItemKind::Trait(..) => "trait",
ItemKind::Mac(..) |
ItemKind::MacroDef(..) |
ItemKind::Impl(..) |
ItemKind::DefaultImpl(..) => "item"
}
@ -1912,24 +1915,6 @@ impl ForeignItemKind {
}
}
/// A macro definition, in this crate or imported from another.
///
/// Not parsed directly, but created on macro import or `macro_rules!` expansion.
#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
pub struct MacroDef {
pub ident: Ident,
pub attrs: Vec<Attribute>,
pub id: NodeId,
pub span: Span,
pub body: ThinTokenStream,
}
impl MacroDef {
pub fn stream(&self) -> TokenStream {
self.body.clone().into()
}
}
#[cfg(test)]
mod tests {
use serialize;

18
src/libsyntax/ext/base.rs
View File

@ -15,7 +15,7 @@ use attr::HasAttrs;
use codemap::{self, CodeMap, ExpnInfo, Spanned, respan};
use syntax_pos::{Span, ExpnId, NO_EXPANSION};
use errors::{DiagnosticBuilder, FatalError};
use ext::expand::{self, Expansion};
use ext::expand::{self, Expansion, Invocation};
use ext::hygiene::Mark;
use fold::{self, Folder};
use parse::{self, parser, DirectoryOwnership};
@ -552,14 +552,15 @@ pub trait Resolver {
fn is_whitelisted_legacy_custom_derive(&self, name: Name) -> bool;
fn visit_expansion(&mut self, mark: Mark, expansion: &Expansion, derives: &[Mark]);
fn add_ext(&mut self, ident: ast::Ident, ext: Rc<SyntaxExtension>);
fn add_expansions_at_stmt(&mut self, id: ast::NodeId, macros: Vec<Mark>);
fn add_builtin(&mut self, ident: ast::Ident, ext: Rc<SyntaxExtension>);
fn resolve_imports(&mut self);
// Resolves attribute and derive legacy macros from `#![plugin(..)]`.
fn find_legacy_attr_invoc(&mut self, attrs: &mut Vec<Attribute>) -> Option<Attribute>;
fn resolve_macro(&mut self, scope: Mark, path: &ast::Path, kind: MacroKind,
force: bool) -> Result<Rc<SyntaxExtension>, Determinacy>;
fn resolve_invoc(&mut self, invoc: &mut Invocation, scope: Mark, force: bool)
-> Result<Option<Rc<SyntaxExtension>>, Determinacy>;
fn resolve_macro(&mut self, scope: Mark, path: &ast::Path, kind: MacroKind, force: bool)
-> Result<Rc<SyntaxExtension>, Determinacy>;
}
#[derive(Copy, Clone, Debug)]
@ -577,11 +578,14 @@ impl Resolver for DummyResolver {
fn is_whitelisted_legacy_custom_derive(&self, _name: Name) -> bool { false }
fn visit_expansion(&mut self, _invoc: Mark, _expansion: &Expansion, _derives: &[Mark]) {}
fn add_ext(&mut self, _ident: ast::Ident, _ext: Rc<SyntaxExtension>) {}
fn add_expansions_at_stmt(&mut self, _id: ast::NodeId, _macros: Vec<Mark>) {}
fn add_builtin(&mut self, _ident: ast::Ident, _ext: Rc<SyntaxExtension>) {}
fn resolve_imports(&mut self) {}
fn find_legacy_attr_invoc(&mut self, _attrs: &mut Vec<Attribute>) -> Option<Attribute> { None }
fn resolve_invoc(&mut self, _invoc: &mut Invocation, _scope: Mark, _force: bool)
-> Result<Option<Rc<SyntaxExtension>>, Determinacy> {
Err(Determinacy::Determined)
}
fn resolve_macro(&mut self, _scope: Mark, _path: &ast::Path, _kind: MacroKind,
_force: bool) -> Result<Rc<SyntaxExtension>, Determinacy> {
Err(Determinacy::Determined)

89
src/libsyntax/ext/expand.rs
View File

@ -154,7 +154,7 @@ impl ExpansionKind {
pub struct Invocation {
pub kind: InvocationKind,
expansion_kind: ExpansionKind,
expansion_data: ExpansionData,
pub expansion_data: ExpansionData,
}
pub enum InvocationKind {
@ -251,7 +251,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
let scope =
if self.monotonic { invoc.expansion_data.mark } else { orig_expansion_data.mark };
let ext = match self.resolve_invoc(&mut invoc, scope, force) {
let ext = match self.cx.resolver.resolve_invoc(&mut invoc, scope, force) {
Ok(ext) => Some(ext),
Err(Determinacy::Determined) => None,
Err(Determinacy::Undetermined) => {
@ -364,64 +364,6 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
result
}
fn resolve_invoc(&mut self, invoc: &mut Invocation, scope: Mark, force: bool)
-> Result<Option<Rc<SyntaxExtension>>, Determinacy> {
let (attr, traits, item) = match invoc.kind {
InvocationKind::Bang { ref mac, .. } => {
return self.cx.resolver.resolve_macro(scope, &mac.node.path,
MacroKind::Bang, force).map(Some);
}
InvocationKind::Attr { attr: None, .. } => return Ok(None),
InvocationKind::Derive { name, span, .. } => {
let path = ast::Path::from_ident(span, Ident::with_empty_ctxt(name));
return self.cx.resolver.resolve_macro(scope, &path,
MacroKind::Derive, force).map(Some)
}
InvocationKind::Attr { ref mut attr, ref traits, ref mut item } => (attr, traits, item),
};
let (attr_name, path) = {
let attr = attr.as_ref().unwrap();
(attr.name(), ast::Path::from_ident(attr.span, Ident::with_empty_ctxt(attr.name())))
};
let mut determined = true;
match self.cx.resolver.resolve_macro(scope, &path, MacroKind::Attr, force) {
Ok(ext) => return Ok(Some(ext)),
Err(Determinacy::Undetermined) => determined = false,
Err(Determinacy::Determined) if force => return Err(Determinacy::Determined),
_ => {}
}
for &(name, span) in traits {
let path = ast::Path::from_ident(span, Ident::with_empty_ctxt(name));
match self.cx.resolver.resolve_macro(scope, &path, MacroKind::Derive, force) {
Ok(ext) => if let SyntaxExtension::ProcMacroDerive(_, ref inert_attrs) = *ext {
if inert_attrs.contains(&attr_name) {
// FIXME(jseyfried) Avoid `mem::replace` here.
let dummy_item = placeholder(ExpansionKind::Items, ast::DUMMY_NODE_ID)
.make_items().pop().unwrap();
*item = mem::replace(item, Annotatable::Item(dummy_item))
.map_attrs(|mut attrs| {
let inert_attr = attr.take().unwrap();
attr::mark_known(&inert_attr);
if self.cx.ecfg.proc_macro_enabled() {
*attr = find_attr_invoc(&mut attrs);
}
attrs.push(inert_attr);
attrs
});
}
return Err(Determinacy::Undetermined);
},
Err(Determinacy::Undetermined) => determined = false,
Err(Determinacy::Determined) => {}
}
}
Err(if determined { Determinacy::Determined } else { Determinacy::Undetermined })
}
fn expand_invoc(&mut self, invoc: Invocation, ext: Rc<SyntaxExtension>) -> Expansion {
match invoc.kind {
InvocationKind::Bang { .. } => self.expand_bang_invoc(invoc, ext),
@ -502,7 +444,8 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
let extname = path.segments.last().unwrap().identifier.name;
let ident = ident.unwrap_or(keywords::Invalid.ident());
let marked_tts = mark_tts(mac.node.stream(), mark);
let marked_tts =
noop_fold_tts(mac.node.stream(), &mut Marker { mark: mark, expn_id: None });
let opt_expanded = match *ext {
NormalTT(ref expandfun, exp_span, allow_internal_unstable) => {
if ident.name != keywords::Invalid.name() {
@ -814,7 +757,7 @@ impl<'a, 'b> InvocationCollector<'a, 'b> {
}
}
fn find_attr_invoc(attrs: &mut Vec<ast::Attribute>) -> Option<ast::Attribute> {
pub fn find_attr_invoc(attrs: &mut Vec<ast::Attribute>) -> Option<ast::Attribute> {
for i in 0 .. attrs.len() {
if !attr::is_known(&attrs[i]) && !is_builtin_attr(&attrs[i]) {
return Some(attrs.remove(i));
@ -960,17 +903,7 @@ impl<'a, 'b> Folder for InvocationCollector<'a, 'b> {
match item.node {
ast::ItemKind::Mac(..) => {
self.check_attributes(&item.attrs);
let is_macro_def = if let ItemKind::Mac(ref mac) = item.node {
mac.node.path.segments[0].identifier.name == "macro_rules"
} else {
unreachable!()
};
item.and_then(|mut item| match item.node {
ItemKind::Mac(_) if is_macro_def => {
item.id = Mark::fresh().as_placeholder_id();
SmallVector::one(P(item))
}
item.and_then(|item| match item.node {
ItemKind::Mac(mac) => {
self.collect(ExpansionKind::Items, InvocationKind::Bang {
mac: mac,
@ -1090,7 +1023,10 @@ impl<'a, 'b> Folder for InvocationCollector<'a, 'b> {
}
fn fold_item_kind(&mut self, item: ast::ItemKind) -> ast::ItemKind {
noop_fold_item_kind(self.cfg.configure_item_kind(item), self)
match item {
ast::ItemKind::MacroDef(..) => item,
_ => noop_fold_item_kind(self.cfg.configure_item_kind(item), self),
}
}
fn new_id(&mut self, id: ast::NodeId) -> ast::NodeId {
@ -1171,8 +1107,3 @@ impl Folder for Marker {
span
}
}
// apply a given mark to the given token trees. Used prior to expansion of a macro.
pub fn mark_tts(tts: TokenStream, m: Mark) -> TokenStream {
noop_fold_tts(tts, &mut Marker{mark:m, expn_id: None})
}

9
src/libsyntax/ext/hygiene.rs
View File

@ -31,7 +31,7 @@ pub struct SyntaxContextData {
}
/// A mark is a unique id associated with a macro expansion.
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, Default)]
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, Default, RustcEncodable, RustcDecodable)]
pub struct Mark(u32);
impl Mark {
@ -118,13 +118,6 @@ impl SyntaxContext {
})
})
}
/// If `ident` is macro expanded, return the source ident from the macro definition
/// and the mark of the expansion that created the macro definition.
pub fn source(self) -> (Self /* source context */, Mark /* source macro */) {
let macro_def_ctxt = self.data().prev_ctxt.data();
(macro_def_ctxt.prev_ctxt, macro_def_ctxt.outer_mark)
}
}
impl fmt::Debug for SyntaxContext {

15
src/libsyntax/ext/placeholders.rs
View File

@ -21,7 +21,6 @@ use util::move_map::MoveMap;
use util::small_vector::SmallVector;
use std::collections::HashMap;
use std::mem;
pub fn placeholder(kind: ExpansionKind, id: ast::NodeId) -> Expansion {
fn mac_placeholder() -> ast::Mac {
@ -174,20 +173,11 @@ impl<'a, 'b> Folder for PlaceholderExpander<'a, 'b> {
fn fold_block(&mut self, block: P<ast::Block>) -> P<ast::Block> {
noop_fold_block(block, self).map(|mut block| {
let mut macros = Vec::new();
let mut remaining_stmts = block.stmts.len();
block.stmts = block.stmts.move_flat_map(|mut stmt| {
remaining_stmts -= 1;
// `macro_rules!` macro definition
if let ast::StmtKind::Item(ref item) = stmt.node {
if let ast::ItemKind::Mac(_) = item.node {
macros.push(Mark::from_placeholder_id(item.id));
return None;
}
}
match stmt.node {
// Avoid wasting a node id on a trailing expression statement,
// which shares a HIR node with the expression itself.
@ -201,11 +191,6 @@ impl<'a, 'b> Folder for PlaceholderExpander<'a, 'b> {
_ => {}
}
if self.monotonic && !macros.is_empty() {
let macros = mem::replace(&mut macros, Vec::new());
self.cx.resolver.add_expansions_at_stmt(stmt.id, macros);
}
Some(stmt)
});

8
src/libsyntax/ext/tt/macro_rules.rs
View File

@ -153,7 +153,7 @@ fn generic_extension<'cx>(cx: &'cx ExtCtxt,
// Holy self-referential!
/// Converts a `macro_rules!` invocation into a syntax extension.
pub fn compile(sess: &ParseSess, def: &ast::MacroDef) -> SyntaxExtension {
pub fn compile(sess: &ParseSess, def: &ast::Item) -> SyntaxExtension {
let lhs_nm = ast::Ident::with_empty_ctxt(Symbol::gensym("lhs"));
let rhs_nm = ast::Ident::with_empty_ctxt(Symbol::gensym("rhs"));
@ -183,7 +183,11 @@ pub fn compile(sess: &ParseSess, def: &ast::MacroDef) -> SyntaxExtension {
];
// Parse the macro_rules! invocation
let argument_map = match parse(sess, def.body.clone().into(), &argument_gram, None) {
let body = match def.node {
ast::ItemKind::MacroDef(ref body) => body.clone().into(),
_ => unreachable!(),
};
let argument_map = match parse(sess, body, &argument_gram, None) {
Success(m) => m,
Failure(sp, tok) => {
let s = parse_failure_msg(tok);

10
src/libsyntax/fold.rs
View File

@ -899,6 +899,7 @@ pub fn noop_fold_item_kind<T: Folder>(i: ItemKind, folder: &mut T) -> ItemKind {
items.move_flat_map(|item| folder.fold_trait_item(item)),
),
ItemKind::Mac(m) => ItemKind::Mac(folder.fold_mac(m)),
ItemKind::MacroDef(tts) => ItemKind::MacroDef(folder.fold_tts(tts.into()).into()),
}
}
@ -959,7 +960,7 @@ pub fn noop_fold_mod<T: Folder>(Mod {inner, items}: Mod, folder: &mut T) -> Mod
}
}
pub fn noop_fold_crate<T: Folder>(Crate {module, attrs, mut exported_macros, span}: Crate,
pub fn noop_fold_crate<T: Folder>(Crate {module, attrs, span}: Crate,
folder: &mut T) -> Crate {
let mut items = folder.fold_item(P(ast::Item {
ident: keywords::Invalid.ident(),
@ -987,14 +988,9 @@ pub fn noop_fold_crate<T: Folder>(Crate {module, attrs, mut exported_macros, spa
}, vec![], span)
};
for def in &mut exported_macros {
def.id = folder.new_id(def.id);
}
Crate {
module: module,
attrs: attrs,
exported_macros: exported_macros,
span: span,
}
}
@ -1387,6 +1383,6 @@ mod tests {
matches_codepattern,
"matches_codepattern",
pprust::to_string(|s| fake_print_crate(s, &folded_crate)),
"zz!zz((zz$zz:zz$(zz $zz:zz)zz+=>(zz$(zz$zz$zz)+)));".to_string());
"macro_rules! zz((zz$zz:zz$(zz $zz:zz)zz+=>(zz$(zz$zz$zz)+)));".to_string());
}
}

45
src/libsyntax/parse/parser.rs
View File

@ -1048,7 +1048,7 @@ impl<'a> Parser<'a> {
self.expected_tokens.clear();
}
pub fn look_ahead<R, F>(&mut self, dist: usize, f: F) -> R where
pub fn look_ahead<R, F>(&self, dist: usize, f: F) -> R where
F: FnOnce(&token::Token) -> R,
{
if dist == 0 {
@ -3699,11 +3699,41 @@ impl<'a> Parser<'a> {
})
}
fn is_union_item(&mut self) -> bool {
fn is_union_item(&self) -> bool {
self.token.is_keyword(keywords::Union) &&
self.look_ahead(1, |t| t.is_ident() && !t.is_any_keyword())
}
fn eat_macro_def(&mut self, attrs: &[Attribute], vis: &Visibility)
-> PResult<'a, Option<P<Item>>> {
let lo = self.span.lo;
match self.token {
token::Ident(ident) if ident.name == "macro_rules" => {
if self.look_ahead(1, |t| *t == token::Not) {
let prev_span = self.prev_span;
self.complain_if_pub_macro(vis, prev_span);
self.bump();
self.bump();
}
}
_ => return Ok(None),
};
let id = self.parse_ident()?;
let (delim, tts) = self.expect_delimited_token_tree()?;
if delim != token::Brace {
if !self.eat(&token::Semi) {
let msg = "macros that expand to items must either be surrounded with braces \
or followed by a semicolon";
self.span_err(self.prev_span, msg);
}
}
let hi = self.prev_span.hi;
let kind = ItemKind::MacroDef(tts);
Ok(Some(self.mk_item(lo, hi, id, kind, Visibility::Inherited, attrs.to_owned())))
}
fn parse_stmt_without_recovery(&mut self,
macro_legacy_warnings: bool)
-> PResult<'a, Option<Stmt>> {
@ -3718,6 +3748,12 @@ impl<'a> Parser<'a> {
node: StmtKind::Local(self.parse_local(attrs.into())?),
span: mk_sp(lo, self.prev_span.hi),
}
} else if let Some(macro_def) = self.eat_macro_def(&attrs, &Visibility::Inherited)? {
Stmt {
id: ast::DUMMY_NODE_ID,
node: StmtKind::Item(macro_def),
span: mk_sp(lo, self.prev_span.hi),
}
// Starts like a simple path, but not a union item.
} else if self.token.is_path_start() &&
!self.token.is_qpath_start() &&
@ -5767,6 +5803,10 @@ impl<'a> Parser<'a> {
maybe_append(attrs, extra_attrs));
return Ok(Some(item));
}
if let Some(macro_def) = self.eat_macro_def(&attrs, &visibility)? {
return Ok(Some(macro_def));
}
self.parse_macro_use_or_failure(attrs,macros_allowed,attributes_allowed,lo,visibility)
}
@ -5948,7 +5988,6 @@ impl<'a> Parser<'a> {
attrs: self.parse_inner_attributes()?,
module: self.parse_mod_items(&token::Eof, lo)?,
span: mk_sp(lo, self.span.lo),
exported_macros: Vec::new(),
})
}

11
src/libsyntax/print/pprust.rs
View File

@ -1318,7 +1318,6 @@ impl<'a> State<'a> {
self.bclose(item.span)?;
}
ast::ItemKind::Mac(codemap::Spanned { ref node, .. }) => {
self.print_visibility(&item.vis)?;
self.print_path(&node.path, false, 0, false)?;
word(&mut self.s, "! ")?;
self.print_ident(item.ident)?;
@ -1329,6 +1328,16 @@ impl<'a> State<'a> {
word(&mut self.s, ";")?;
self.end()?;
}
ast::ItemKind::MacroDef(ref tts) => {
word(&mut self.s, "macro_rules! ")?;
self.print_ident(item.ident)?;
self.cbox(INDENT_UNIT)?;
self.popen()?;
self.print_tts(tts.clone().into())?;
self.pclose()?;
word(&mut self.s, ";")?;
self.end()?;
}
}
self.ann.post(self, NodeItem(item))
}

5
src/libsyntax/util/node_count.rs
View File

@ -148,9 +148,4 @@ impl<'ast> Visitor<'ast> for NodeCounter {
fn visit_attribute(&mut self, _attr: &Attribute) {
self.count += 1;
}
fn visit_macro_def(&mut self, macro_def: &MacroDef) {
self.count += 1;
walk_macro_def(self, macro_def)
}
}

10
src/libsyntax/visit.rs
View File

@ -125,9 +125,6 @@ pub trait Visitor<'ast>: Sized {
walk_assoc_type_binding(self, type_binding)
}
fn visit_attribute(&mut self, _attr: &'ast Attribute) {}
fn visit_macro_def(&mut self, macro_def: &'ast MacroDef) {
walk_macro_def(self, macro_def)
}
fn visit_vis(&mut self, vis: &'ast Visibility) {
walk_vis(self, vis)
}
@ -176,12 +173,6 @@ pub fn walk_ident<'a, V: Visitor<'a>>(visitor: &mut V, span: Span, ident: Ident)
pub fn walk_crate<'a, V: Visitor<'a>>(visitor: &mut V, krate: &'a Crate) {
visitor.visit_mod(&krate.module, krate.span, CRATE_NODE_ID);
walk_list!(visitor, visit_attribute, &krate.attrs);
walk_list!(visitor, visit_macro_def, &krate.exported_macros);
}
pub fn walk_macro_def<'a, V: Visitor<'a>>(visitor: &mut V, macro_def: &'a MacroDef) {
visitor.visit_ident(macro_def.span, macro_def.ident);
walk_list!(visitor, visit_attribute, &macro_def.attrs);
}
pub fn walk_mod<'a, V: Visitor<'a>>(visitor: &mut V, module: &'a Mod) {
@ -295,6 +286,7 @@ pub fn walk_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a Item) {
walk_list!(visitor, visit_trait_item, methods);
}
ItemKind::Mac(ref mac) => visitor.visit_mac(mac),
ItemKind::MacroDef(..) => {},
}
walk_list!(visitor, visit_attribute, &item.attrs);
}

2
src/libsyntax_ext/deriving/mod.rs
View File

@ -99,7 +99,7 @@ macro_rules! derive_traits {
pub fn register_builtin_derives(resolver: &mut Resolver) {
$(
resolver.add_ext(
resolver.add_builtin(
ast::Ident::with_empty_ctxt(Symbol::intern($name)),
Rc::new(SyntaxExtension::BuiltinDerive($func))
);

2
src/libsyntax_ext/lib.rs
View File

@ -59,7 +59,7 @@ pub fn register_builtins(resolver: &mut syntax::ext::base::Resolver,
deriving::register_builtin_derives(resolver);
let mut register = |name, ext| {
resolver.add_ext(ast::Ident::with_empty_ctxt(name), Rc::new(ext));
resolver.add_builtin(ast::Ident::with_empty_ctxt(name), Rc::new(ext));
};
macro_rules! register {

16
src/libsyntax_ext/proc_macro_registrar.rs
View File

@ -90,12 +90,7 @@ pub fn modify(sess: &ParseSess,
krate.module.items.push(mk_registrar(&mut cx, &derives, &attr_macros, &bang_macros));
if krate.exported_macros.len() > 0 {
handler.err("cannot export macro_rules! macros from a `proc-macro` \
crate type currently");
}
return krate
krate
}
fn is_proc_macro_attr(attr: &ast::Attribute) -> bool {
@ -251,6 +246,15 @@ impl<'a> CollectProcMacros<'a> {
impl<'a> Visitor<'a> for CollectProcMacros<'a> {
fn visit_item(&mut self, item: &'a ast::Item) {
if let ast::ItemKind::MacroDef(..) = item.node {
if self.is_proc_macro_crate &&
item.attrs.iter().any(|attr| attr.name() == "macro_export") {
let msg =
"cannot export macro_rules! macros from a `proc-macro` crate type currently";
self.handler.span_err(item.span, msg);
}
}
// First up, make sure we're checking a bare function. If we're not then
// we're just not interested in this item.
//

1
src/test/run-make/pretty-expanded-hygiene/input.pp.rs
View File

@ -12,6 +12,7 @@
#![feature(no_core)]
#![no_core]
macro_rules! foo /* 60#0 */(( $ x : ident ) => { y + $ x });
fn bar /* 62#0 */() { let x /* 59#2 */ = 1; y /* 61#4 */ + x /* 59#5 */ }