// Copyright 2012-2014 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 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. // Decoding metadata from a single crate's metadata #![allow(non_camel_case_types)] use self::Family::*; use cstore::{self, crate_metadata}; use common::*; use encoder::def_to_u64; use index; use tls_context; use tydecode::TyDecoder; use rustc::back::svh::Svh; use rustc::front::map as hir_map; use rustc::util::nodemap::FnvHashMap; use rustc_front::hir; use middle::cstore::{LOCAL_CRATE, FoundAst, InlinedItem, LinkagePreference}; use middle::cstore::{DefLike, DlDef, DlField, DlImpl, tls}; use middle::def::Def; use middle::def_id::{DefId, DefIndex}; use middle::lang_items; use middle::subst; use middle::ty::{ImplContainer, TraitContainer}; use middle::ty::{self, Ty, TypeFoldable, VariantKind}; use rustc::mir; use rustc::mir::visit::MutVisitor; use std::cell::Cell; use std::io::prelude::*; use std::io; use std::rc::Rc; use std::str; use rbml::reader; use rbml; use serialize::Decodable; use syntax::attr; use syntax::parse::token::{IdentInterner, special_idents}; use syntax::parse::token; use syntax::ast; use syntax::abi::Abi; use syntax::codemap::{self, Span, BytePos, NO_EXPANSION}; use syntax::print::pprust; use syntax::ptr::P; pub type Cmd<'a> = &'a crate_metadata; impl crate_metadata { fn get_item(&self, item_id: DefIndex) -> Option { self.index.lookup_item(self.data(), item_id).map(|pos| { reader::doc_at(self.data(), pos as usize).unwrap().doc }) } fn lookup_item(&self, item_id: DefIndex) -> rbml::Doc { match self.get_item(item_id) { None => panic!("lookup_item: id not found: {:?}", item_id), Some(d) => d } } } pub fn load_index(data: &[u8]) -> index::Index { let index = reader::get_doc(rbml::Doc::new(data), tag_index); index::Index::from_rbml(index) } pub fn crate_rustc_version(data: &[u8]) -> Option { let doc = rbml::Doc::new(data); reader::maybe_get_doc(doc, tag_rustc_version).map(|s| s.as_str()) } pub fn load_xrefs(data: &[u8]) -> index::DenseIndex { let index = reader::get_doc(rbml::Doc::new(data), tag_xref_index); index::DenseIndex::from_buf(index.data, index.start, index.end) } #[derive(Clone, Copy, Debug, PartialEq)] enum Family { ImmStatic, // c MutStatic, // b Fn, // f StaticMethod, // F Method, // h Type, // y Mod, // m ForeignMod, // n Enum, // t Variant(VariantKind), // V, v, w Impl, // i DefaultImpl, // d Trait, // I Struct(VariantKind), // S, s, u PublicField, // g InheritedField, // N Constant, // C } fn item_family(item: rbml::Doc) -> Family { let fam = reader::get_doc(item, tag_items_data_item_family); match reader::doc_as_u8(fam) as char { 'C' => Constant, 'c' => ImmStatic, 'b' => MutStatic, 'f' => Fn, 'F' => StaticMethod, 'h' => Method, 'y' => Type, 'm' => Mod, 'n' => ForeignMod, 't' => Enum, 'V' => Variant(VariantKind::Struct), 'v' => Variant(VariantKind::Tuple), 'w' => Variant(VariantKind::Unit), 'i' => Impl, 'd' => DefaultImpl, 'I' => Trait, 'S' => Struct(VariantKind::Struct), 's' => Struct(VariantKind::Tuple), 'u' => Struct(VariantKind::Unit), 'g' => PublicField, 'N' => InheritedField, c => panic!("unexpected family char: {}", c) } } fn item_visibility(item: rbml::Doc) -> hir::Visibility { match reader::maybe_get_doc(item, tag_items_data_item_visibility) { None => hir::Public, Some(visibility_doc) => { match reader::doc_as_u8(visibility_doc) as char { 'y' => hir::Public, 'i' => hir::Inherited, _ => panic!("unknown visibility character") } } } } fn fn_constness(item: rbml::Doc) -> hir::Constness { match reader::maybe_get_doc(item, tag_items_data_item_constness) { None => hir::Constness::NotConst, Some(constness_doc) => { match reader::doc_as_u8(constness_doc) as char { 'c' => hir::Constness::Const, 'n' => hir::Constness::NotConst, _ => panic!("unknown constness character") } } } } fn item_sort(item: rbml::Doc) -> Option { reader::tagged_docs(item, tag_item_trait_item_sort).nth(0).map(|doc| { doc.as_str_slice().as_bytes()[0] as char }) } fn item_symbol(item: rbml::Doc) -> String { reader::get_doc(item, tag_items_data_item_symbol).as_str().to_string() } fn translated_def_id(cdata: Cmd, d: rbml::Doc) -> DefId { let id = reader::doc_as_u64(d); let index = DefIndex::new((id & 0xFFFF_FFFF) as usize); let def_id = DefId { krate: (id >> 32) as u32, index: index }; translate_def_id(cdata, def_id) } fn item_parent_item(cdata: Cmd, d: rbml::Doc) -> Option { reader::tagged_docs(d, tag_items_data_parent_item).nth(0).map(|did| { translated_def_id(cdata, did) }) } fn item_require_parent_item(cdata: Cmd, d: rbml::Doc) -> DefId { translated_def_id(cdata, reader::get_doc(d, tag_items_data_parent_item)) } fn item_def_id(d: rbml::Doc, cdata: Cmd) -> DefId { translated_def_id(cdata, reader::get_doc(d, tag_def_id)) } fn reexports<'a>(d: rbml::Doc<'a>) -> reader::TaggedDocsIterator<'a> { reader::tagged_docs(d, tag_items_data_item_reexport) } fn variant_disr_val(d: rbml::Doc) -> Option { reader::maybe_get_doc(d, tag_disr_val).and_then(|val_doc| { reader::with_doc_data(val_doc, |data| { str::from_utf8(data).ok().and_then(|s| s.parse().ok()) }) }) } fn doc_type<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd) -> Ty<'tcx> { let tp = reader::get_doc(doc, tag_items_data_item_type); TyDecoder::with_doc(tcx, cdata.cnum, tp, &mut |did| translate_def_id(cdata, did)) .parse_ty() } fn maybe_doc_type<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd) -> Option> { reader::maybe_get_doc(doc, tag_items_data_item_type).map(|tp| { TyDecoder::with_doc(tcx, cdata.cnum, tp, &mut |did| translate_def_id(cdata, did)) .parse_ty() }) } pub fn item_type<'tcx>(_item_id: DefId, item: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd) -> Ty<'tcx> { doc_type(item, tcx, cdata) } fn doc_trait_ref<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd) -> ty::TraitRef<'tcx> { TyDecoder::with_doc(tcx, cdata.cnum, doc, &mut |did| translate_def_id(cdata, did)) .parse_trait_ref() } fn item_trait_ref<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd) -> ty::TraitRef<'tcx> { let tp = reader::get_doc(doc, tag_item_trait_ref); doc_trait_ref(tp, tcx, cdata) } fn item_path(item_doc: rbml::Doc) -> Vec { let path_doc = reader::get_doc(item_doc, tag_path); reader::docs(path_doc).filter_map(|(tag, elt_doc)| { if tag == tag_path_elem_mod { let s = elt_doc.as_str_slice(); Some(hir_map::PathMod(token::intern(s))) } else if tag == tag_path_elem_name { let s = elt_doc.as_str_slice(); Some(hir_map::PathName(token::intern(s))) } else { // ignore tag_path_len element None } }).collect() } fn item_name(intr: &IdentInterner, item: rbml::Doc) -> ast::Name { let name = reader::get_doc(item, tag_paths_data_name); let string = name.as_str_slice(); match intr.find(string) { None => token::intern(string), Some(val) => val, } } fn family_to_variant_kind<'tcx>(family: Family) -> Option { match family { Struct(VariantKind::Struct) | Variant(VariantKind::Struct) => Some(ty::VariantKind::Struct), Struct(VariantKind::Tuple) | Variant(VariantKind::Tuple) => Some(ty::VariantKind::Tuple), Struct(VariantKind::Unit) | Variant(VariantKind::Unit) => Some(ty::VariantKind::Unit), _ => None, } } fn item_to_def_like(cdata: Cmd, item: rbml::Doc, did: DefId) -> DefLike { let fam = item_family(item); match fam { Constant => { // Check whether we have an associated const item. match item_sort(item) { Some('C') | Some('c') => { DlDef(Def::AssociatedConst(did)) } _ => { // Regular const item. DlDef(Def::Const(did)) } } } ImmStatic => DlDef(Def::Static(did, false)), MutStatic => DlDef(Def::Static(did, true)), Struct(..) => DlDef(Def::Struct(did)), Fn => DlDef(Def::Fn(did)), Method | StaticMethod => { DlDef(Def::Method(did)) } Type => { if item_sort(item) == Some('t') { let trait_did = item_require_parent_item(cdata, item); DlDef(Def::AssociatedTy(trait_did, did)) } else { DlDef(Def::TyAlias(did)) } } Mod => DlDef(Def::Mod(did)), ForeignMod => DlDef(Def::ForeignMod(did)), Variant(..) => { let enum_did = item_require_parent_item(cdata, item); DlDef(Def::Variant(enum_did, did)) } Trait => DlDef(Def::Trait(did)), Enum => DlDef(Def::Enum(did)), Impl | DefaultImpl => DlImpl(did), PublicField | InheritedField => DlField, } } fn parse_unsafety(item_doc: rbml::Doc) -> hir::Unsafety { let unsafety_doc = reader::get_doc(item_doc, tag_unsafety); if reader::doc_as_u8(unsafety_doc) != 0 { hir::Unsafety::Unsafe } else { hir::Unsafety::Normal } } fn parse_paren_sugar(item_doc: rbml::Doc) -> bool { let paren_sugar_doc = reader::get_doc(item_doc, tag_paren_sugar); reader::doc_as_u8(paren_sugar_doc) != 0 } fn parse_polarity(item_doc: rbml::Doc) -> hir::ImplPolarity { let polarity_doc = reader::get_doc(item_doc, tag_polarity); if reader::doc_as_u8(polarity_doc) != 0 { hir::ImplPolarity::Negative } else { hir::ImplPolarity::Positive } } fn parse_associated_type_names(item_doc: rbml::Doc) -> Vec { let names_doc = reader::get_doc(item_doc, tag_associated_type_names); reader::tagged_docs(names_doc, tag_associated_type_name) .map(|name_doc| token::intern(name_doc.as_str_slice())) .collect() } pub fn get_trait_def<'tcx>(cdata: Cmd, item_id: DefIndex, tcx: &ty::ctxt<'tcx>) -> ty::TraitDef<'tcx> { let item_doc = cdata.lookup_item(item_id); let generics = doc_generics(item_doc, tcx, cdata, tag_item_generics); let unsafety = parse_unsafety(item_doc); let associated_type_names = parse_associated_type_names(item_doc); let paren_sugar = parse_paren_sugar(item_doc); ty::TraitDef::new(unsafety, paren_sugar, generics, item_trait_ref(item_doc, tcx, cdata), associated_type_names) } pub fn get_adt_def<'tcx>(intr: &IdentInterner, cdata: Cmd, item_id: DefIndex, tcx: &ty::ctxt<'tcx>) -> ty::AdtDefMaster<'tcx> { fn expect_variant_kind<'tcx>(family: Family, tcx: &ty::ctxt<'tcx>) -> ty::VariantKind { match family_to_variant_kind(family) { Some(kind) => kind, _ => tcx.sess.bug(&format!("unexpected family: {:?}", family)), } } fn get_enum_variants<'tcx>(intr: &IdentInterner, cdata: Cmd, doc: rbml::Doc, tcx: &ty::ctxt<'tcx>) -> Vec> { let mut disr_val = 0; reader::tagged_docs(doc, tag_items_data_item_variant).map(|p| { let did = translated_def_id(cdata, p); let item = cdata.lookup_item(did.index); if let Some(disr) = variant_disr_val(item) { disr_val = disr; } let disr = disr_val; disr_val = disr_val.wrapping_add(1); ty::VariantDefData { did: did, name: item_name(intr, item), fields: get_variant_fields(intr, cdata, item, tcx), disr_val: disr, kind: expect_variant_kind(item_family(item), tcx), } }).collect() } fn get_variant_fields<'tcx>(intr: &IdentInterner, cdata: Cmd, doc: rbml::Doc, tcx: &ty::ctxt<'tcx>) -> Vec> { reader::tagged_docs(doc, tag_item_field).map(|f| { let ff = item_family(f); match ff { PublicField | InheritedField => {}, _ => tcx.sess.bug(&format!("expected field, found {:?}", ff)) }; ty::FieldDefData::new(item_def_id(f, cdata), item_name(intr, f), struct_field_family_to_visibility(ff)) }).chain(reader::tagged_docs(doc, tag_item_unnamed_field).map(|f| { let ff = item_family(f); ty::FieldDefData::new(item_def_id(f, cdata), special_idents::unnamed_field.name, struct_field_family_to_visibility(ff)) })).collect() } fn get_struct_variant<'tcx>(intr: &IdentInterner, cdata: Cmd, doc: rbml::Doc, did: DefId, tcx: &ty::ctxt<'tcx>) -> ty::VariantDefData<'tcx, 'tcx> { ty::VariantDefData { did: did, name: item_name(intr, doc), fields: get_variant_fields(intr, cdata, doc, tcx), disr_val: 0, kind: expect_variant_kind(item_family(doc), tcx), } } let doc = cdata.lookup_item(item_id); let did = DefId { krate: cdata.cnum, index: item_id }; let (kind, variants) = match item_family(doc) { Enum => { (ty::AdtKind::Enum, get_enum_variants(intr, cdata, doc, tcx)) } Struct(..) => { let ctor_did = reader::maybe_get_doc(doc, tag_items_data_item_struct_ctor). map_or(did, |ctor_doc| translated_def_id(cdata, ctor_doc)); (ty::AdtKind::Struct, vec![get_struct_variant(intr, cdata, doc, ctor_did, tcx)]) } _ => tcx.sess.bug( &format!("get_adt_def called on a non-ADT {:?} - {:?}", item_family(doc), did)) }; let adt = tcx.intern_adt_def(did, kind, variants); // this needs to be done *after* the variant is interned, // to support recursive structures for variant in &adt.variants { if variant.kind() == ty::VariantKind::Tuple && adt.adt_kind() == ty::AdtKind::Enum { // tuple-like enum variant fields aren't real items - get the types // from the ctor. debug!("evaluating the ctor-type of {:?}", variant.name); let ctor_ty = get_type(cdata, variant.did.index, tcx).ty; debug!("evaluating the ctor-type of {:?}.. {:?}", variant.name, ctor_ty); let field_tys = match ctor_ty.sty { ty::TyBareFn(_, &ty::BareFnTy { sig: ty::Binder(ty::FnSig { ref inputs, .. }), ..}) => { // tuple-struct constructors don't have escaping regions assert!(!inputs.has_escaping_regions()); inputs }, _ => tcx.sess.bug("tuple-variant ctor is not an ADT") }; for (field, &ty) in variant.fields.iter().zip(field_tys.iter()) { field.fulfill_ty(ty); } } else { for field in &variant.fields { debug!("evaluating the type of {:?}::{:?}", variant.name, field.name); let ty = get_type(cdata, field.did.index, tcx).ty; field.fulfill_ty(ty); debug!("evaluating the type of {:?}::{:?}: {:?}", variant.name, field.name, ty); } } } adt } pub fn get_predicates<'tcx>(cdata: Cmd, item_id: DefIndex, tcx: &ty::ctxt<'tcx>) -> ty::GenericPredicates<'tcx> { let item_doc = cdata.lookup_item(item_id); doc_predicates(item_doc, tcx, cdata, tag_item_generics) } pub fn get_super_predicates<'tcx>(cdata: Cmd, item_id: DefIndex, tcx: &ty::ctxt<'tcx>) -> ty::GenericPredicates<'tcx> { let item_doc = cdata.lookup_item(item_id); doc_predicates(item_doc, tcx, cdata, tag_item_super_predicates) } pub fn get_type<'tcx>(cdata: Cmd, id: DefIndex, tcx: &ty::ctxt<'tcx>) -> ty::TypeScheme<'tcx> { let item_doc = cdata.lookup_item(id); let t = item_type(DefId { krate: cdata.cnum, index: id }, item_doc, tcx, cdata); let generics = doc_generics(item_doc, tcx, cdata, tag_item_generics); ty::TypeScheme { generics: generics, ty: t } } pub fn get_stability(cdata: Cmd, id: DefIndex) -> Option { let item = cdata.lookup_item(id); reader::maybe_get_doc(item, tag_items_data_item_stability).map(|doc| { let mut decoder = reader::Decoder::new(doc); Decodable::decode(&mut decoder).unwrap() }) } pub fn get_deprecation(cdata: Cmd, id: DefIndex) -> Option { let item = cdata.lookup_item(id); reader::maybe_get_doc(item, tag_items_data_item_deprecation).map(|doc| { let mut decoder = reader::Decoder::new(doc); Decodable::decode(&mut decoder).unwrap() }) } pub fn get_repr_attrs(cdata: Cmd, id: DefIndex) -> Vec { let item = cdata.lookup_item(id); match reader::maybe_get_doc(item, tag_items_data_item_repr).map(|doc| { let mut decoder = reader::Decoder::new(doc); Decodable::decode(&mut decoder).unwrap() }) { Some(attrs) => attrs, None => Vec::new(), } } pub fn get_impl_polarity<'tcx>(cdata: Cmd, id: DefIndex) -> Option { let item_doc = cdata.lookup_item(id); let fam = item_family(item_doc); match fam { Family::Impl => { Some(parse_polarity(item_doc)) } _ => None } } pub fn get_custom_coerce_unsized_kind<'tcx>( cdata: Cmd, id: DefIndex) -> Option { let item_doc = cdata.lookup_item(id); reader::maybe_get_doc(item_doc, tag_impl_coerce_unsized_kind).map(|kind_doc| { let mut decoder = reader::Decoder::new(kind_doc); Decodable::decode(&mut decoder).unwrap() }) } pub fn get_impl_trait<'tcx>(cdata: Cmd, id: DefIndex, tcx: &ty::ctxt<'tcx>) -> Option> { let item_doc = cdata.lookup_item(id); let fam = item_family(item_doc); match fam { Family::Impl | Family::DefaultImpl => { reader::maybe_get_doc(item_doc, tag_item_trait_ref).map(|tp| { doc_trait_ref(tp, tcx, cdata) }) } _ => None } } pub fn get_symbol(cdata: Cmd, id: DefIndex) -> String { return item_symbol(cdata.lookup_item(id)); } /// If you have a crate_metadata, call get_symbol instead pub fn get_symbol_from_buf(data: &[u8], id: DefIndex) -> String { let index = load_index(data); let pos = index.lookup_item(data, id).unwrap(); let doc = reader::doc_at(data, pos as usize).unwrap().doc; item_symbol(doc) } /// Iterates over the language items in the given crate. pub fn each_lang_item(cdata: Cmd, mut f: F) -> bool where F: FnMut(DefIndex, usize) -> bool, { let root = rbml::Doc::new(cdata.data()); let lang_items = reader::get_doc(root, tag_lang_items); reader::tagged_docs(lang_items, tag_lang_items_item).all(|item_doc| { let id_doc = reader::get_doc(item_doc, tag_lang_items_item_id); let id = reader::doc_as_u32(id_doc) as usize; let index_doc = reader::get_doc(item_doc, tag_lang_items_item_index); let index = DefIndex::from_u32(reader::doc_as_u32(index_doc)); f(index, id) }) } fn each_child_of_item_or_crate(intr: Rc, cdata: Cmd, item_doc: rbml::Doc, mut get_crate_data: G, mut callback: F) where F: FnMut(DefLike, ast::Name, hir::Visibility), G: FnMut(ast::CrateNum) -> Rc, { // Iterate over all children. for child_info_doc in reader::tagged_docs(item_doc, tag_mod_child) { let child_def_id = translated_def_id(cdata, child_info_doc); // This item may be in yet another crate if it was the child of a // reexport. let crate_data = if child_def_id.krate == cdata.cnum { None } else { Some(get_crate_data(child_def_id.krate)) }; let crate_data = match crate_data { Some(ref cdata) => &**cdata, None => cdata }; // Get the item. match crate_data.get_item(child_def_id.index) { None => {} Some(child_item_doc) => { // Hand off the item to the callback. let child_name = item_name(&intr, child_item_doc); let def_like = item_to_def_like(crate_data, child_item_doc, child_def_id); let visibility = item_visibility(child_item_doc); callback(def_like, child_name, visibility); } } } // As a special case, iterate over all static methods of // associated implementations too. This is a bit of a botch. // --pcwalton for inherent_impl_def_id_doc in reader::tagged_docs(item_doc, tag_items_data_item_inherent_impl) { let inherent_impl_def_id = item_def_id(inherent_impl_def_id_doc, cdata); if let Some(inherent_impl_doc) = cdata.get_item(inherent_impl_def_id.index) { for impl_item_def_id_doc in reader::tagged_docs(inherent_impl_doc, tag_item_impl_item) { let impl_item_def_id = item_def_id(impl_item_def_id_doc, cdata); if let Some(impl_method_doc) = cdata.get_item(impl_item_def_id.index) { if let StaticMethod = item_family(impl_method_doc) { // Hand off the static method to the callback. let static_method_name = item_name(&intr, impl_method_doc); let static_method_def_like = item_to_def_like(cdata, impl_method_doc, impl_item_def_id); callback(static_method_def_like, static_method_name, item_visibility(impl_method_doc)); } } } } } for reexport_doc in reexports(item_doc) { let def_id_doc = reader::get_doc(reexport_doc, tag_items_data_item_reexport_def_id); let child_def_id = translated_def_id(cdata, def_id_doc); let name_doc = reader::get_doc(reexport_doc, tag_items_data_item_reexport_name); let name = name_doc.as_str_slice(); // This reexport may be in yet another crate. let crate_data = if child_def_id.krate == cdata.cnum { None } else { Some(get_crate_data(child_def_id.krate)) }; let crate_data = match crate_data { Some(ref cdata) => &**cdata, None => cdata }; // Get the item. if let Some(child_item_doc) = crate_data.get_item(child_def_id.index) { // Hand off the item to the callback. let def_like = item_to_def_like(crate_data, child_item_doc, child_def_id); // These items have a public visibility because they're part of // a public re-export. callback(def_like, token::intern(name), hir::Public); } } } /// Iterates over each child of the given item. pub fn each_child_of_item(intr: Rc, cdata: Cmd, id: DefIndex, get_crate_data: G, callback: F) where F: FnMut(DefLike, ast::Name, hir::Visibility), G: FnMut(ast::CrateNum) -> Rc, { // Find the item. let item_doc = match cdata.get_item(id) { None => return, Some(item_doc) => item_doc, }; each_child_of_item_or_crate(intr, cdata, item_doc, get_crate_data, callback) } /// Iterates over all the top-level crate items. pub fn each_top_level_item_of_crate(intr: Rc, cdata: Cmd, get_crate_data: G, callback: F) where F: FnMut(DefLike, ast::Name, hir::Visibility), G: FnMut(ast::CrateNum) -> Rc, { let root_doc = rbml::Doc::new(cdata.data()); let misc_info_doc = reader::get_doc(root_doc, tag_misc_info); let crate_items_doc = reader::get_doc(misc_info_doc, tag_misc_info_crate_items); each_child_of_item_or_crate(intr, cdata, crate_items_doc, get_crate_data, callback) } pub fn get_item_path(cdata: Cmd, id: DefIndex) -> Vec { item_path(cdata.lookup_item(id)) } pub fn get_item_name(intr: &IdentInterner, cdata: Cmd, id: DefIndex) -> ast::Name { item_name(intr, cdata.lookup_item(id)) } pub type DecodeInlinedItem<'a> = Box FnMut(Cmd, &ty::ctxt<'tcx>, Vec, // parent_path hir_map::DefPath, // parent_def_path rbml::Doc, DefId) -> Result<&'tcx InlinedItem, (Vec, hir_map::DefPath)> + 'a>; pub fn maybe_get_item_ast<'tcx>(cdata: Cmd, tcx: &ty::ctxt<'tcx>, id: DefIndex, mut decode_inlined_item: DecodeInlinedItem) -> FoundAst<'tcx> { debug!("Looking up item: {:?}", id); let item_doc = cdata.lookup_item(id); let item_did = item_def_id(item_doc, cdata); let parent_path = { let mut path = item_path(item_doc); path.pop(); path }; let parent_def_path = { let mut def_path = def_path(cdata, id); def_path.pop(); def_path }; match decode_inlined_item(cdata, tcx, parent_path, parent_def_path, item_doc, item_did) { Ok(ii) => FoundAst::Found(ii), Err((mut parent_path, mut parent_def_path)) => { match item_parent_item(cdata, item_doc) { Some(parent_did) => { // Remove the last element from the paths, since we are now // trying to inline the parent. parent_path.pop(); parent_def_path.pop(); let parent_item = cdata.lookup_item(parent_did.index); match decode_inlined_item(cdata, tcx, parent_path, parent_def_path, parent_item, parent_did) { Ok(ii) => FoundAst::FoundParent(parent_did, ii), Err(_) => FoundAst::NotFound } } None => FoundAst::NotFound } } } } pub fn is_item_mir_available<'tcx>(cdata: Cmd, id: DefIndex) -> bool { if let Some(item_doc) = cdata.get_item(id) { return reader::maybe_get_doc(item_doc, tag_mir as usize).is_some(); } false } pub fn maybe_get_item_mir<'tcx>(cdata: Cmd, tcx: &ty::ctxt<'tcx>, id: DefIndex) -> Option> { let item_doc = cdata.lookup_item(id); return reader::maybe_get_doc(item_doc, tag_mir as usize).map(|mir_doc| { let dcx = tls_context::DecodingContext { crate_metadata: cdata, tcx: tcx, }; let mut decoder = reader::Decoder::new(mir_doc); let mut mir = decoder.read_opaque(|opaque_decoder, _| { tls::enter_decoding_context(&dcx, opaque_decoder, |_, opaque_decoder| { Decodable::decode(opaque_decoder) }) }).unwrap(); assert!(decoder.position() == mir_doc.end); let mut def_id_and_span_translator = MirDefIdAndSpanTranslator { crate_metadata: cdata, codemap: tcx.sess.codemap(), last_filemap_index_hint: Cell::new(0), }; def_id_and_span_translator.visit_mir(&mut mir); mir }); struct MirDefIdAndSpanTranslator<'cdata, 'codemap> { crate_metadata: Cmd<'cdata>, codemap: &'codemap codemap::CodeMap, last_filemap_index_hint: Cell } impl<'v, 'cdata, 'codemap> mir::visit::MutVisitor<'v> for MirDefIdAndSpanTranslator<'cdata, 'codemap> { fn visit_def_id(&mut self, def_id: &mut DefId) { *def_id = translate_def_id(self.crate_metadata, *def_id); } fn visit_span(&mut self, span: &mut Span) { *span = translate_span(self.crate_metadata, self.codemap, &self.last_filemap_index_hint, *span); } } } fn get_explicit_self(item: rbml::Doc) -> ty::ExplicitSelfCategory { fn get_mutability(ch: u8) -> hir::Mutability { match ch as char { 'i' => hir::MutImmutable, 'm' => hir::MutMutable, _ => panic!("unknown mutability character: `{}`", ch as char), } } let explicit_self_doc = reader::get_doc(item, tag_item_trait_method_explicit_self); let string = explicit_self_doc.as_str_slice(); let explicit_self_kind = string.as_bytes()[0]; match explicit_self_kind as char { 's' => ty::ExplicitSelfCategory::Static, 'v' => ty::ExplicitSelfCategory::ByValue, '~' => ty::ExplicitSelfCategory::ByBox, // FIXME(#4846) expl. region '&' => { ty::ExplicitSelfCategory::ByReference( ty::ReEmpty, get_mutability(string.as_bytes()[1])) } _ => panic!("unknown self type code: `{}`", explicit_self_kind as char) } } /// Returns the def IDs of all the items in the given implementation. pub fn get_impl_items(cdata: Cmd, impl_id: DefIndex) -> Vec { reader::tagged_docs(cdata.lookup_item(impl_id), tag_item_impl_item).map(|doc| { let def_id = item_def_id(doc, cdata); match item_sort(doc) { Some('C') | Some('c') => ty::ConstTraitItemId(def_id), Some('r') | Some('p') => ty::MethodTraitItemId(def_id), Some('t') => ty::TypeTraitItemId(def_id), _ => panic!("unknown impl item sort"), } }).collect() } pub fn get_trait_name(intr: Rc, cdata: Cmd, id: DefIndex) -> ast::Name { let doc = cdata.lookup_item(id); item_name(&intr, doc) } pub fn is_static_method(cdata: Cmd, id: DefIndex) -> bool { let doc = cdata.lookup_item(id); match item_sort(doc) { Some('r') | Some('p') => { get_explicit_self(doc) == ty::ExplicitSelfCategory::Static } _ => false } } pub fn get_impl_or_trait_item<'tcx>(intr: Rc, cdata: Cmd, id: DefIndex, tcx: &ty::ctxt<'tcx>) -> ty::ImplOrTraitItem<'tcx> { let item_doc = cdata.lookup_item(id); let def_id = item_def_id(item_doc, cdata); let container_id = item_require_parent_item(cdata, item_doc); let container_doc = cdata.lookup_item(container_id.index); let container = match item_family(container_doc) { Trait => TraitContainer(container_id), _ => ImplContainer(container_id), }; let name = item_name(&intr, item_doc); let vis = item_visibility(item_doc); match item_sort(item_doc) { sort @ Some('C') | sort @ Some('c') => { let ty = doc_type(item_doc, tcx, cdata); ty::ConstTraitItem(Rc::new(ty::AssociatedConst { name: name, ty: ty, vis: vis, def_id: def_id, container: container, has_value: sort == Some('C') })) } Some('r') | Some('p') => { let generics = doc_generics(item_doc, tcx, cdata, tag_method_ty_generics); let predicates = doc_predicates(item_doc, tcx, cdata, tag_method_ty_generics); let ity = tcx.lookup_item_type(def_id).ty; let fty = match ity.sty { ty::TyBareFn(_, fty) => fty.clone(), _ => tcx.sess.bug(&format!( "the type {:?} of the method {:?} is not a function?", ity, name)) }; let explicit_self = get_explicit_self(item_doc); ty::MethodTraitItem(Rc::new(ty::Method::new(name, generics, predicates, fty, explicit_self, vis, def_id, container))) } Some('t') => { let ty = maybe_doc_type(item_doc, tcx, cdata); ty::TypeTraitItem(Rc::new(ty::AssociatedType { name: name, ty: ty, vis: vis, def_id: def_id, container: container, })) } _ => panic!("unknown impl/trait item sort"), } } pub fn get_trait_item_def_ids(cdata: Cmd, id: DefIndex) -> Vec { let item = cdata.lookup_item(id); reader::tagged_docs(item, tag_item_trait_item).map(|mth| { let def_id = item_def_id(mth, cdata); match item_sort(mth) { Some('C') | Some('c') => ty::ConstTraitItemId(def_id), Some('r') | Some('p') => ty::MethodTraitItemId(def_id), Some('t') => ty::TypeTraitItemId(def_id), _ => panic!("unknown trait item sort"), } }).collect() } pub fn get_item_variances(cdata: Cmd, id: DefIndex) -> ty::ItemVariances { let item_doc = cdata.lookup_item(id); let variance_doc = reader::get_doc(item_doc, tag_item_variances); let mut decoder = reader::Decoder::new(variance_doc); Decodable::decode(&mut decoder).unwrap() } pub fn get_provided_trait_methods<'tcx>(intr: Rc, cdata: Cmd, id: DefIndex, tcx: &ty::ctxt<'tcx>) -> Vec>> { let item = cdata.lookup_item(id); reader::tagged_docs(item, tag_item_trait_item).filter_map(|mth_id| { let did = item_def_id(mth_id, cdata); let mth = cdata.lookup_item(did.index); if item_sort(mth) == Some('p') { let trait_item = get_impl_or_trait_item(intr.clone(), cdata, did.index, tcx); if let ty::MethodTraitItem(ref method) = trait_item { Some((*method).clone()) } else { None } } else { None } }).collect() } pub fn get_associated_consts<'tcx>(intr: Rc, cdata: Cmd, id: DefIndex, tcx: &ty::ctxt<'tcx>) -> Vec>> { let item = cdata.lookup_item(id); [tag_item_trait_item, tag_item_impl_item].iter().flat_map(|&tag| { reader::tagged_docs(item, tag).filter_map(|ac_id| { let did = item_def_id(ac_id, cdata); let ac_doc = cdata.lookup_item(did.index); match item_sort(ac_doc) { Some('C') | Some('c') => { let trait_item = get_impl_or_trait_item(intr.clone(), cdata, did.index, tcx); if let ty::ConstTraitItem(ref ac) = trait_item { Some((*ac).clone()) } else { None } } _ => None } }) }).collect() } pub fn get_variant_kind(cdata: Cmd, node_id: DefIndex) -> Option { let item = cdata.lookup_item(node_id); family_to_variant_kind(item_family(item)) } pub fn get_struct_ctor_def_id(cdata: Cmd, node_id: DefIndex) -> Option { let item = cdata.lookup_item(node_id); reader::maybe_get_doc(item, tag_items_data_item_struct_ctor). map(|ctor_doc| translated_def_id(cdata, ctor_doc)) } /// If node_id is the constructor of a tuple struct, retrieve the NodeId of /// the actual type definition, otherwise, return None pub fn get_tuple_struct_definition_if_ctor(cdata: Cmd, node_id: DefIndex) -> Option { let item = cdata.lookup_item(node_id); reader::tagged_docs(item, tag_items_data_item_is_tuple_struct_ctor).next().map(|_| { item_require_parent_item(cdata, item) }) } pub fn get_item_attrs(cdata: Cmd, orig_node_id: DefIndex) -> Vec { // The attributes for a tuple struct are attached to the definition, not the ctor; // we assume that someone passing in a tuple struct ctor is actually wanting to // look at the definition let node_id = get_tuple_struct_definition_if_ctor(cdata, orig_node_id); let node_id = node_id.map(|x| x.index).unwrap_or(orig_node_id); let item = cdata.lookup_item(node_id); get_attributes(item) } pub fn get_struct_field_attrs(cdata: Cmd) -> FnvHashMap> { let data = rbml::Doc::new(cdata.data()); let fields = reader::get_doc(data, tag_struct_fields); reader::tagged_docs(fields, tag_struct_field).map(|field| { let def_id = translated_def_id(cdata, reader::get_doc(field, tag_def_id)); let attrs = get_attributes(field); (def_id, attrs) }).collect() } fn struct_field_family_to_visibility(family: Family) -> hir::Visibility { match family { PublicField => hir::Public, InheritedField => hir::Inherited, _ => panic!() } } pub fn get_struct_field_names(intr: &IdentInterner, cdata: Cmd, id: DefIndex) -> Vec { let item = cdata.lookup_item(id); reader::tagged_docs(item, tag_item_field).map(|an_item| { item_name(intr, an_item) }).chain(reader::tagged_docs(item, tag_item_unnamed_field).map(|_| { special_idents::unnamed_field.name })).collect() } fn get_meta_items(md: rbml::Doc) -> Vec> { reader::tagged_docs(md, tag_meta_item_word).map(|meta_item_doc| { let nd = reader::get_doc(meta_item_doc, tag_meta_item_name); let n = token::intern_and_get_ident(nd.as_str_slice()); attr::mk_word_item(n) }).chain(reader::tagged_docs(md, tag_meta_item_name_value).map(|meta_item_doc| { let nd = reader::get_doc(meta_item_doc, tag_meta_item_name); let vd = reader::get_doc(meta_item_doc, tag_meta_item_value); let n = token::intern_and_get_ident(nd.as_str_slice()); let v = token::intern_and_get_ident(vd.as_str_slice()); // FIXME (#623): Should be able to decode MetaItemKind::NameValue variants, // but currently the encoder just drops them attr::mk_name_value_item_str(n, v) })).chain(reader::tagged_docs(md, tag_meta_item_list).map(|meta_item_doc| { let nd = reader::get_doc(meta_item_doc, tag_meta_item_name); let n = token::intern_and_get_ident(nd.as_str_slice()); let subitems = get_meta_items(meta_item_doc); attr::mk_list_item(n, subitems) })).collect() } fn get_attributes(md: rbml::Doc) -> Vec { match reader::maybe_get_doc(md, tag_attributes) { Some(attrs_d) => { reader::tagged_docs(attrs_d, tag_attribute).map(|attr_doc| { let is_sugared_doc = reader::doc_as_u8( reader::get_doc(attr_doc, tag_attribute_is_sugared_doc) ) == 1; let meta_items = get_meta_items(attr_doc); // Currently it's only possible to have a single meta item on // an attribute assert_eq!(meta_items.len(), 1); let meta_item = meta_items.into_iter().nth(0).unwrap(); codemap::Spanned { node: ast::Attribute_ { id: attr::mk_attr_id(), style: ast::AttrStyle::Outer, value: meta_item, is_sugared_doc: is_sugared_doc, }, span: codemap::DUMMY_SP } }).collect() }, None => vec![], } } fn list_crate_attributes(md: rbml::Doc, hash: &Svh, out: &mut io::Write) -> io::Result<()> { try!(write!(out, "=Crate Attributes ({})=\n", *hash)); let r = get_attributes(md); for attr in &r { try!(write!(out, "{}\n", pprust::attribute_to_string(attr))); } write!(out, "\n\n") } pub fn get_crate_attributes(data: &[u8]) -> Vec { get_attributes(rbml::Doc::new(data)) } #[derive(Clone)] pub struct CrateDep { pub cnum: ast::CrateNum, pub name: String, pub hash: Svh, pub explicitly_linked: bool, } pub fn get_crate_deps(data: &[u8]) -> Vec { let cratedoc = rbml::Doc::new(data); let depsdoc = reader::get_doc(cratedoc, tag_crate_deps); fn docstr(doc: rbml::Doc, tag_: usize) -> String { let d = reader::get_doc(doc, tag_); d.as_str_slice().to_string() } reader::tagged_docs(depsdoc, tag_crate_dep).enumerate().map(|(crate_num, depdoc)| { let name = docstr(depdoc, tag_crate_dep_crate_name); let hash = Svh::new(&docstr(depdoc, tag_crate_dep_hash)); let doc = reader::get_doc(depdoc, tag_crate_dep_explicitly_linked); let explicitly_linked = reader::doc_as_u8(doc) != 0; CrateDep { cnum: crate_num as u32 + 1, name: name, hash: hash, explicitly_linked: explicitly_linked, } }).collect() } fn list_crate_deps(data: &[u8], out: &mut io::Write) -> io::Result<()> { try!(write!(out, "=External Dependencies=\n")); for dep in &get_crate_deps(data) { try!(write!(out, "{} {}-{}\n", dep.cnum, dep.name, dep.hash)); } try!(write!(out, "\n")); Ok(()) } pub fn maybe_get_crate_hash(data: &[u8]) -> Option { let cratedoc = rbml::Doc::new(data); reader::maybe_get_doc(cratedoc, tag_crate_hash).map(|doc| { Svh::new(doc.as_str_slice()) }) } pub fn get_crate_hash(data: &[u8]) -> Svh { let cratedoc = rbml::Doc::new(data); let hashdoc = reader::get_doc(cratedoc, tag_crate_hash); Svh::new(hashdoc.as_str_slice()) } pub fn maybe_get_crate_name(data: &[u8]) -> Option { let cratedoc = rbml::Doc::new(data); reader::maybe_get_doc(cratedoc, tag_crate_crate_name).map(|doc| { doc.as_str_slice().to_string() }) } pub fn get_crate_triple(data: &[u8]) -> Option { let cratedoc = rbml::Doc::new(data); let triple_doc = reader::maybe_get_doc(cratedoc, tag_crate_triple); triple_doc.map(|s| s.as_str().to_string()) } pub fn get_crate_name(data: &[u8]) -> String { maybe_get_crate_name(data).expect("no crate name in crate") } pub fn list_crate_metadata(bytes: &[u8], out: &mut io::Write) -> io::Result<()> { let hash = get_crate_hash(bytes); let md = rbml::Doc::new(bytes); try!(list_crate_attributes(md, &hash, out)); list_crate_deps(bytes, out) } // Translates a def_id from an external crate to a def_id for the current // compilation environment. We use this when trying to load types from // external crates - if those types further refer to types in other crates // then we must translate the crate number from that encoded in the external // crate to the correct local crate number. pub fn translate_def_id(cdata: Cmd, did: DefId) -> DefId { if did.is_local() { return DefId { krate: cdata.cnum, index: did.index }; } match cdata.cnum_map.borrow().get(&did.krate) { Some(&n) => { DefId { krate: n, index: did.index, } } None => panic!("didn't find a crate in the cnum_map") } } // Translate a DefId from the current compilation environment to a DefId // for an external crate. fn reverse_translate_def_id(cdata: Cmd, did: DefId) -> Option { if did.krate == cdata.cnum { return Some(DefId { krate: LOCAL_CRATE, index: did.index }); } for (&local, &global) in cdata.cnum_map.borrow().iter() { if global == did.krate { return Some(DefId { krate: local, index: did.index }); } } None } /// Translates a `Span` from an extern crate to the corresponding `Span` /// within the local crate's codemap. pub fn translate_span(cdata: Cmd, codemap: &codemap::CodeMap, last_filemap_index_hint: &Cell, span: codemap::Span) -> codemap::Span { let span = if span.lo > span.hi { // Currently macro expansion sometimes produces invalid Span values // where lo > hi. In order not to crash the compiler when trying to // translate these values, let's transform them into something we // can handle (and which will produce useful debug locations at // least some of the time). // This workaround is only necessary as long as macro expansion is // not fixed. FIXME(#23480) codemap::mk_sp(span.lo, span.lo) } else { span }; let imported_filemaps = cdata.imported_filemaps(&codemap); let filemap = { // Optimize for the case that most spans within a translated item // originate from the same filemap. let last_filemap_index = last_filemap_index_hint.get(); let last_filemap = &imported_filemaps[last_filemap_index]; if span.lo >= last_filemap.original_start_pos && span.lo <= last_filemap.original_end_pos && span.hi >= last_filemap.original_start_pos && span.hi <= last_filemap.original_end_pos { last_filemap } else { let mut a = 0; let mut b = imported_filemaps.len(); while b - a > 1 { let m = (a + b) / 2; if imported_filemaps[m].original_start_pos > span.lo { b = m; } else { a = m; } } last_filemap_index_hint.set(a); &imported_filemaps[a] } }; let lo = (span.lo - filemap.original_start_pos) + filemap.translated_filemap.start_pos; let hi = (span.hi - filemap.original_start_pos) + filemap.translated_filemap.start_pos; codemap::mk_sp(lo, hi) } pub fn each_inherent_implementation_for_type(cdata: Cmd, id: DefIndex, mut callback: F) where F: FnMut(DefId), { let item_doc = cdata.lookup_item(id); for impl_doc in reader::tagged_docs(item_doc, tag_items_data_item_inherent_impl) { if reader::maybe_get_doc(impl_doc, tag_item_trait_ref).is_none() { callback(item_def_id(impl_doc, cdata)); } } } pub fn each_implementation_for_trait(cdata: Cmd, def_id: DefId, mut callback: F) where F: FnMut(DefId), { // Do a reverse lookup beforehand to avoid touching the crate_num // hash map in the loop below. if let Some(crate_local_did) = reverse_translate_def_id(cdata, def_id) { let def_id_u64 = def_to_u64(crate_local_did); let impls_doc = reader::get_doc(rbml::Doc::new(cdata.data()), tag_impls); for trait_doc in reader::tagged_docs(impls_doc, tag_impls_trait) { let trait_def_id = reader::get_doc(trait_doc, tag_def_id); if reader::doc_as_u64(trait_def_id) != def_id_u64 { continue; } for impl_doc in reader::tagged_docs(trait_doc, tag_impls_trait_impl) { callback(translated_def_id(cdata, impl_doc)); } } } } pub fn get_trait_of_item(cdata: Cmd, id: DefIndex, tcx: &ty::ctxt) -> Option { let item_doc = cdata.lookup_item(id); let parent_item_id = match item_parent_item(cdata, item_doc) { None => return None, Some(item_id) => item_id, }; let parent_item_doc = cdata.lookup_item(parent_item_id.index); match item_family(parent_item_doc) { Trait => Some(item_def_id(parent_item_doc, cdata)), Impl | DefaultImpl => { reader::maybe_get_doc(parent_item_doc, tag_item_trait_ref) .map(|_| item_trait_ref(parent_item_doc, tcx, cdata).def_id) } _ => None } } pub fn get_native_libraries(cdata: Cmd) -> Vec<(cstore::NativeLibraryKind, String)> { let libraries = reader::get_doc(rbml::Doc::new(cdata.data()), tag_native_libraries); reader::tagged_docs(libraries, tag_native_libraries_lib).map(|lib_doc| { let kind_doc = reader::get_doc(lib_doc, tag_native_libraries_kind); let name_doc = reader::get_doc(lib_doc, tag_native_libraries_name); let kind: cstore::NativeLibraryKind = cstore::NativeLibraryKind::from_u32(reader::doc_as_u32(kind_doc)).unwrap(); let name = name_doc.as_str().to_string(); (kind, name) }).collect() } pub fn get_plugin_registrar_fn(data: &[u8]) -> Option { reader::maybe_get_doc(rbml::Doc::new(data), tag_plugin_registrar_fn) .map(|doc| DefIndex::from_u32(reader::doc_as_u32(doc))) } pub fn each_exported_macro(data: &[u8], intr: &IdentInterner, mut f: F) where F: FnMut(ast::Name, Vec, Span, String) -> bool, { let macros = reader::get_doc(rbml::Doc::new(data), tag_macro_defs); for macro_doc in reader::tagged_docs(macros, tag_macro_def) { let name = item_name(intr, macro_doc); let attrs = get_attributes(macro_doc); let span = get_macro_span(macro_doc); let body = reader::get_doc(macro_doc, tag_macro_def_body); if !f(name, attrs, span, body.as_str().to_string()) { break; } } } pub fn get_macro_span(doc: rbml::Doc) -> Span { let lo_doc = reader::get_doc(doc, tag_macro_def_span_lo); let lo = BytePos(reader::doc_as_u32(lo_doc)); let hi_doc = reader::get_doc(doc, tag_macro_def_span_hi); let hi = BytePos(reader::doc_as_u32(hi_doc)); return Span { lo: lo, hi: hi, expn_id: NO_EXPANSION }; } pub fn get_dylib_dependency_formats(cdata: Cmd) -> Vec<(ast::CrateNum, LinkagePreference)> { let formats = reader::get_doc(rbml::Doc::new(cdata.data()), tag_dylib_dependency_formats); let mut result = Vec::new(); debug!("found dylib deps: {}", formats.as_str_slice()); for spec in formats.as_str_slice().split(',') { if spec.is_empty() { continue } let cnum = spec.split(':').nth(0).unwrap(); let link = spec.split(':').nth(1).unwrap(); let cnum: ast::CrateNum = cnum.parse().unwrap(); let cnum = match cdata.cnum_map.borrow().get(&cnum) { Some(&n) => n, None => panic!("didn't find a crate in the cnum_map") }; result.push((cnum, if link == "d" { LinkagePreference::RequireDynamic } else { LinkagePreference::RequireStatic })); } return result; } pub fn get_missing_lang_items(cdata: Cmd) -> Vec { let items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_lang_items); reader::tagged_docs(items, tag_lang_items_missing).map(|missing_docs| { lang_items::LangItem::from_u32(reader::doc_as_u32(missing_docs)).unwrap() }).collect() } pub fn get_method_arg_names(cdata: Cmd, id: DefIndex) -> Vec { let method_doc = cdata.lookup_item(id); match reader::maybe_get_doc(method_doc, tag_method_argument_names) { Some(args_doc) => { reader::tagged_docs(args_doc, tag_method_argument_name).map(|name_doc| { name_doc.as_str_slice().to_string() }).collect() }, None => vec![], } } pub fn get_reachable_ids(cdata: Cmd) -> Vec { let items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_reachable_ids); reader::tagged_docs(items, tag_reachable_id).map(|doc| { DefId { krate: cdata.cnum, index: DefIndex::from_u32(reader::doc_as_u32(doc)), } }).collect() } pub fn is_typedef(cdata: Cmd, id: DefIndex) -> bool { let item_doc = cdata.lookup_item(id); match item_family(item_doc) { Type => true, _ => false, } } pub fn is_const_fn(cdata: Cmd, id: DefIndex) -> bool { let item_doc = cdata.lookup_item(id); match fn_constness(item_doc) { hir::Constness::Const => true, hir::Constness::NotConst => false, } } pub fn is_extern_item(cdata: Cmd, id: DefIndex, tcx: &ty::ctxt) -> bool { let item_doc = match cdata.get_item(id) { Some(doc) => doc, None => return false, }; let applicable = match item_family(item_doc) { ImmStatic | MutStatic => true, Fn => { let ty::TypeScheme { generics, ty } = get_type(cdata, id, tcx); let no_generics = generics.types.is_empty(); match ty.sty { ty::TyBareFn(_, fn_ty) if fn_ty.abi != Abi::Rust => return no_generics, _ => no_generics, } }, _ => false, }; if applicable { attr::contains_extern_indicator(tcx.sess.diagnostic(), &get_attributes(item_doc)) } else { false } } pub fn is_impl(cdata: Cmd, id: DefIndex) -> bool { let item_doc = cdata.lookup_item(id); match item_family(item_doc) { Impl => true, _ => false, } } fn doc_generics<'tcx>(base_doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd, tag: usize) -> ty::Generics<'tcx> { let doc = reader::get_doc(base_doc, tag); let mut types = subst::VecPerParamSpace::empty(); for p in reader::tagged_docs(doc, tag_type_param_def) { let bd = TyDecoder::with_doc(tcx, cdata.cnum, p, &mut |did| translate_def_id(cdata, did)) .parse_type_param_def(); types.push(bd.space, bd); } let mut regions = subst::VecPerParamSpace::empty(); for rp_doc in reader::tagged_docs(doc, tag_region_param_def) { let ident_str_doc = reader::get_doc(rp_doc, tag_region_param_def_ident); let name = item_name(&token::get_ident_interner(), ident_str_doc); let def_id_doc = reader::get_doc(rp_doc, tag_region_param_def_def_id); let def_id = translated_def_id(cdata, def_id_doc); let doc = reader::get_doc(rp_doc, tag_region_param_def_space); let space = subst::ParamSpace::from_uint(reader::doc_as_u64(doc) as usize); let doc = reader::get_doc(rp_doc, tag_region_param_def_index); let index = reader::doc_as_u64(doc) as u32; let bounds = reader::tagged_docs(rp_doc, tag_items_data_region).map(|p| { TyDecoder::with_doc(tcx, cdata.cnum, p, &mut |did| translate_def_id(cdata, did)) .parse_region() }).collect(); regions.push(space, ty::RegionParameterDef { name: name, def_id: def_id, space: space, index: index, bounds: bounds }); } ty::Generics { types: types, regions: regions } } fn doc_predicate<'tcx>(cdata: Cmd, doc: rbml::Doc, tcx: &ty::ctxt<'tcx>) -> ty::Predicate<'tcx> { let predicate_pos = cdata.xref_index.lookup( cdata.data(), reader::doc_as_u32(doc)).unwrap() as usize; TyDecoder::new( cdata.data(), cdata.cnum, predicate_pos, tcx, &mut |did| translate_def_id(cdata, did) ).parse_predicate() } fn doc_predicates<'tcx>(base_doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd, tag: usize) -> ty::GenericPredicates<'tcx> { let doc = reader::get_doc(base_doc, tag); let mut predicates = subst::VecPerParamSpace::empty(); for predicate_doc in reader::tagged_docs(doc, tag_type_predicate) { predicates.push(subst::TypeSpace, doc_predicate(cdata, predicate_doc, tcx)); } for predicate_doc in reader::tagged_docs(doc, tag_self_predicate) { predicates.push(subst::SelfSpace, doc_predicate(cdata, predicate_doc, tcx)); } for predicate_doc in reader::tagged_docs(doc, tag_fn_predicate) { predicates.push(subst::FnSpace, doc_predicate(cdata, predicate_doc, tcx)); } ty::GenericPredicates { predicates: predicates } } pub fn is_defaulted_trait(cdata: Cmd, trait_id: DefIndex) -> bool { let trait_doc = cdata.lookup_item(trait_id); assert!(item_family(trait_doc) == Family::Trait); let defaulted_doc = reader::get_doc(trait_doc, tag_defaulted_trait); reader::doc_as_u8(defaulted_doc) != 0 } pub fn is_default_impl(cdata: Cmd, impl_id: DefIndex) -> bool { let impl_doc = cdata.lookup_item(impl_id); item_family(impl_doc) == Family::DefaultImpl } pub fn get_imported_filemaps(metadata: &[u8]) -> Vec { let crate_doc = rbml::Doc::new(metadata); let cm_doc = reader::get_doc(crate_doc, tag_codemap); reader::tagged_docs(cm_doc, tag_codemap_filemap).map(|filemap_doc| { let mut decoder = reader::Decoder::new(filemap_doc); decoder.read_opaque(|opaque_decoder, _| { Decodable::decode(opaque_decoder) }).unwrap() }).collect() } pub fn closure_kind(cdata: Cmd, closure_id: DefIndex) -> ty::ClosureKind { let closure_doc = cdata.lookup_item(closure_id); let closure_kind_doc = reader::get_doc(closure_doc, tag_items_closure_kind); let mut decoder = reader::Decoder::new(closure_kind_doc); ty::ClosureKind::decode(&mut decoder).unwrap() } pub fn closure_ty<'tcx>(cdata: Cmd, closure_id: DefIndex, tcx: &ty::ctxt<'tcx>) -> ty::ClosureTy<'tcx> { let closure_doc = cdata.lookup_item(closure_id); let closure_ty_doc = reader::get_doc(closure_doc, tag_items_closure_ty); TyDecoder::with_doc(tcx, cdata.cnum, closure_ty_doc, &mut |did| translate_def_id(cdata, did)) .parse_closure_ty() } fn def_key(item_doc: rbml::Doc) -> hir_map::DefKey { match reader::maybe_get_doc(item_doc, tag_def_key) { Some(def_key_doc) => { let mut decoder = reader::Decoder::new(def_key_doc); hir_map::DefKey::decode(&mut decoder).unwrap() } None => { panic!("failed to find block with tag {:?} for item with family {:?}", tag_def_key, item_family(item_doc)) } } } pub fn def_path(cdata: Cmd, id: DefIndex) -> hir_map::DefPath { debug!("def_path(id={:?})", id); hir_map::definitions::make_def_path(id, |parent| { debug!("def_path: parent={:?}", parent); let parent_doc = cdata.lookup_item(parent); def_key(parent_doc) }) }