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1a4d82fc 1// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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2// file at the top-level directory of this distribution and at
3// http://rust-lang.org/COPYRIGHT.
4//
5// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8// option. This file may not be copied, modified, or distributed
9// except according to those terms.
10
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11// Decoding metadata from a single crate's metadata
12
1a4d82fc 13#![allow(non_camel_case_types)]
223e47cc 14
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15use self::Family::*;
16
54a0048b 17use astencode::decode_inlined_item;
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18use cstore::{self, crate_metadata};
19use common::*;
20use encoder::def_to_u64;
21use index;
9cc50fc6 22use tls_context;
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23use tydecode::TyDecoder;
24
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25use rustc::hir::svh::Svh;
26use rustc::hir::map as hir_map;
92a42be0 27use rustc::util::nodemap::FnvHashMap;
54a0048b 28use rustc::hir;
e9174d1e 29
92a42be0 30use middle::cstore::{LOCAL_CRATE, FoundAst, InlinedItem, LinkagePreference};
9cc50fc6 31use middle::cstore::{DefLike, DlDef, DlField, DlImpl, tls};
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32use rustc::hir::def::Def;
33use rustc::hir::def_id::{DefId, DefIndex};
1a4d82fc 34use middle::lang_items;
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35use rustc::ty::subst;
36use rustc::ty::{ImplContainer, TraitContainer};
37use rustc::ty::{self, Ty, TyCtxt, TypeFoldable, VariantKind};
38
39use rustc_const_math::ConstInt;
1a4d82fc 40
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41use rustc::mir;
42use rustc::mir::visit::MutVisitor;
43
44use std::cell::Cell;
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45use std::io::prelude::*;
46use std::io;
1a4d82fc 47use std::rc::Rc;
970d7e83 48use std::str;
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49
50use rbml::reader;
51use rbml;
52use serialize::Decodable;
b039eaaf 53use syntax::attr;
54a0048b 54use syntax::parse::token::{self, IdentInterner};
1a4d82fc 55use syntax::ast;
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56use syntax::abi::Abi;
57use syntax::codemap::{self, Span, BytePos, NO_EXPANSION};
b039eaaf 58use syntax::print::pprust;
1a4d82fc 59use syntax::ptr::P;
223e47cc 60
c34b1796 61
e9174d1e 62pub type Cmd<'a> = &'a crate_metadata;
223e47cc 63
e9174d1e 64impl crate_metadata {
b039eaaf 65 fn get_item(&self, item_id: DefIndex) -> Option<rbml::Doc> {
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66 self.index.lookup_item(self.data(), item_id).map(|pos| {
67 reader::doc_at(self.data(), pos as usize).unwrap().doc
68 })
223e47cc 69 }
223e47cc 70
b039eaaf 71 fn lookup_item(&self, item_id: DefIndex) -> rbml::Doc {
e9174d1e 72 match self.get_item(item_id) {
54a0048b 73 None => bug!("lookup_item: id not found: {:?}", item_id),
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74 Some(d) => d
75 }
970d7e83 76 }
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77}
78
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79pub fn load_index(data: &[u8]) -> index::Index {
80 let index = reader::get_doc(rbml::Doc::new(data), tag_index);
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81 index::Index::from_rbml(index)
82}
83
84pub fn crate_rustc_version(data: &[u8]) -> Option<String> {
85 let doc = rbml::Doc::new(data);
86 reader::maybe_get_doc(doc, tag_rustc_version).map(|s| s.as_str())
87}
88
89pub fn load_xrefs(data: &[u8]) -> index::DenseIndex {
90 let index = reader::get_doc(rbml::Doc::new(data), tag_xref_index);
91 index::DenseIndex::from_buf(index.data, index.start, index.end)
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92}
93
7453a54e 94#[derive(Clone, Copy, Debug, PartialEq)]
223e47cc 95enum Family {
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96 ImmStatic, // c
97 MutStatic, // b
223e47cc 98 Fn, // f
223e47cc 99 StaticMethod, // F
1a4d82fc 100 Method, // h
223e47cc 101 Type, // y
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102 Mod, // m
103 ForeignMod, // n
104 Enum, // t
7453a54e 105 Variant(VariantKind), // V, v, w
223e47cc 106 Impl, // i
9cc50fc6 107 DefaultImpl, // d
223e47cc 108 Trait, // I
7453a54e 109 Struct(VariantKind), // S, s, u
223e47cc 110 PublicField, // g
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111 InheritedField, // N
112 Constant, // C
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113}
114
1a4d82fc 115fn item_family(item: rbml::Doc) -> Family {
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116 let fam = reader::get_doc(item, tag_items_data_item_family);
117 match reader::doc_as_u8(fam) as char {
1a4d82fc 118 'C' => Constant,
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119 'c' => ImmStatic,
120 'b' => MutStatic,
223e47cc 121 'f' => Fn,
223e47cc 122 'F' => StaticMethod,
1a4d82fc 123 'h' => Method,
223e47cc 124 'y' => Type,
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125 'm' => Mod,
126 'n' => ForeignMod,
127 't' => Enum,
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128 'V' => Variant(VariantKind::Struct),
129 'v' => Variant(VariantKind::Tuple),
130 'w' => Variant(VariantKind::Unit),
223e47cc 131 'i' => Impl,
c34b1796 132 'd' => DefaultImpl,
223e47cc 133 'I' => Trait,
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134 'S' => Struct(VariantKind::Struct),
135 's' => Struct(VariantKind::Tuple),
136 'u' => Struct(VariantKind::Unit),
223e47cc 137 'g' => PublicField,
223e47cc 138 'N' => InheritedField,
54a0048b 139 c => bug!("unexpected family char: {}", c)
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140 }
141}
142
54a0048b 143fn item_visibility(item: rbml::Doc) -> ty::Visibility {
223e47cc 144 match reader::maybe_get_doc(item, tag_items_data_item_visibility) {
54a0048b 145 None => ty::Visibility::Public,
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146 Some(visibility_doc) => {
147 match reader::doc_as_u8(visibility_doc) as char {
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148 'y' => ty::Visibility::Public,
149 'i' => ty::Visibility::PrivateExternal,
150 _ => bug!("unknown visibility character")
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151 }
152 }
153 }
154}
155
e9174d1e 156fn fn_constness(item: rbml::Doc) -> hir::Constness {
62682a34 157 match reader::maybe_get_doc(item, tag_items_data_item_constness) {
e9174d1e 158 None => hir::Constness::NotConst,
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159 Some(constness_doc) => {
160 match reader::doc_as_u8(constness_doc) as char {
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161 'c' => hir::Constness::Const,
162 'n' => hir::Constness::NotConst,
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163 _ => bug!("unknown constness character")
164 }
165 }
166 }
167}
168
169fn item_defaultness(item: rbml::Doc) -> hir::Defaultness {
170 match reader::maybe_get_doc(item, tag_items_data_item_defaultness) {
171 None => hir::Defaultness::Default, // should occur only for default impls on traits
172 Some(defaultness_doc) => {
173 match reader::doc_as_u8(defaultness_doc) as char {
174 'd' => hir::Defaultness::Default,
175 'f' => hir::Defaultness::Final,
176 _ => bug!("unknown defaultness character")
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177 }
178 }
179 }
180}
181
c34b1796 182fn item_sort(item: rbml::Doc) -> Option<char> {
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183 reader::tagged_docs(item, tag_item_trait_item_sort).nth(0).map(|doc| {
184 doc.as_str_slice().as_bytes()[0] as char
185 })
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186}
187
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188fn item_symbol(item: rbml::Doc) -> String {
189 reader::get_doc(item, tag_items_data_item_symbol).as_str().to_string()
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190}
191
e9174d1e 192fn translated_def_id(cdata: Cmd, d: rbml::Doc) -> DefId {
d9579d0f 193 let id = reader::doc_as_u64(d);
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194 let index = DefIndex::new((id & 0xFFFF_FFFF) as usize);
195 let def_id = DefId { krate: (id >> 32) as u32, index: index };
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196 translate_def_id(cdata, def_id)
197}
198
e9174d1e 199fn item_parent_item(cdata: Cmd, d: rbml::Doc) -> Option<DefId> {
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200 reader::tagged_docs(d, tag_items_data_parent_item).nth(0).map(|did| {
201 translated_def_id(cdata, did)
202 })
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203}
204
e9174d1e 205fn item_require_parent_item(cdata: Cmd, d: rbml::Doc) -> DefId {
d9579d0f 206 translated_def_id(cdata, reader::get_doc(d, tag_items_data_parent_item))
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207}
208
e9174d1e 209fn item_def_id(d: rbml::Doc, cdata: Cmd) -> DefId {
d9579d0f 210 translated_def_id(cdata, reader::get_doc(d, tag_def_id))
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211}
212
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213fn reexports<'a>(d: rbml::Doc<'a>) -> reader::TaggedDocsIterator<'a> {
214 reader::tagged_docs(d, tag_items_data_item_reexport)
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215}
216
54a0048b 217fn variant_disr_val(d: rbml::Doc) -> Option<u64> {
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218 reader::maybe_get_doc(d, tag_disr_val).and_then(|val_doc| {
219 reader::with_doc_data(val_doc, |data| {
85aaf69f 220 str::from_utf8(data).ok().and_then(|s| s.parse().ok())
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221 })
222 })
223}
224
54a0048b 225fn doc_type<'tcx>(doc: rbml::Doc, tcx: &TyCtxt<'tcx>, cdata: Cmd) -> Ty<'tcx> {
223e47cc 226 let tp = reader::get_doc(doc, tag_items_data_item_type);
e9174d1e 227 TyDecoder::with_doc(tcx, cdata.cnum, tp,
b039eaaf 228 &mut |did| translate_def_id(cdata, did))
e9174d1e 229 .parse_ty()
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230}
231
54a0048b 232fn maybe_doc_type<'tcx>(doc: rbml::Doc, tcx: &TyCtxt<'tcx>, cdata: Cmd) -> Option<Ty<'tcx>> {
62682a34 233 reader::maybe_get_doc(doc, tag_items_data_item_type).map(|tp| {
e9174d1e 234 TyDecoder::with_doc(tcx, cdata.cnum, tp,
b039eaaf 235 &mut |did| translate_def_id(cdata, did))
e9174d1e 236 .parse_ty()
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237 })
238}
239
e9174d1e 240pub fn item_type<'tcx>(_item_id: DefId, item: rbml::Doc,
54a0048b 241 tcx: &TyCtxt<'tcx>, cdata: Cmd) -> Ty<'tcx> {
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242 doc_type(item, tcx, cdata)
243}
244
54a0048b 245fn doc_trait_ref<'tcx>(doc: rbml::Doc, tcx: &TyCtxt<'tcx>, cdata: Cmd)
d9579d0f 246 -> ty::TraitRef<'tcx> {
e9174d1e 247 TyDecoder::with_doc(tcx, cdata.cnum, doc,
b039eaaf 248 &mut |did| translate_def_id(cdata, did))
e9174d1e 249 .parse_trait_ref()
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250}
251
54a0048b 252fn item_trait_ref<'tcx>(doc: rbml::Doc, tcx: &TyCtxt<'tcx>, cdata: Cmd)
d9579d0f 253 -> ty::TraitRef<'tcx> {
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254 let tp = reader::get_doc(doc, tag_item_trait_ref);
255 doc_trait_ref(tp, tcx, cdata)
256}
257
1a4d82fc 258fn item_name(intr: &IdentInterner, item: rbml::Doc) -> ast::Name {
223e47cc 259 let name = reader::get_doc(item, tag_paths_data_name);
970d7e83 260 let string = name.as_str_slice();
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261 match intr.find(string) {
262 None => token::intern(string),
263 Some(val) => val,
970d7e83 264 }
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265}
266
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267fn family_to_variant_kind<'tcx>(family: Family) -> Option<ty::VariantKind> {
268 match family {
269 Struct(VariantKind::Struct) | Variant(VariantKind::Struct) =>
270 Some(ty::VariantKind::Struct),
271 Struct(VariantKind::Tuple) | Variant(VariantKind::Tuple) =>
272 Some(ty::VariantKind::Tuple),
273 Struct(VariantKind::Unit) | Variant(VariantKind::Unit) =>
274 Some(ty::VariantKind::Unit),
275 _ => None,
276 }
277}
278
e9174d1e 279fn item_to_def_like(cdata: Cmd, item: rbml::Doc, did: DefId) -> DefLike {
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280 let fam = item_family(item);
281 match fam {
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282 Constant => {
283 // Check whether we have an associated const item.
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284 match item_sort(item) {
285 Some('C') | Some('c') => {
7453a54e 286 DlDef(Def::AssociatedConst(did))
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287 }
288 _ => {
289 // Regular const item.
7453a54e 290 DlDef(Def::Const(did))
b039eaaf 291 }
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292 }
293 }
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294 ImmStatic => DlDef(Def::Static(did, false)),
295 MutStatic => DlDef(Def::Static(did, true)),
296 Struct(..) => DlDef(Def::Struct(did)),
297 Fn => DlDef(Def::Fn(did)),
1a4d82fc 298 Method | StaticMethod => {
7453a54e 299 DlDef(Def::Method(did))
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300 }
301 Type => {
302 if item_sort(item) == Some('t') {
d9579d0f 303 let trait_did = item_require_parent_item(cdata, item);
7453a54e 304 DlDef(Def::AssociatedTy(trait_did, did))
c34b1796 305 } else {
7453a54e 306 DlDef(Def::TyAlias(did))
1a4d82fc 307 }
223e47cc 308 }
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309 Mod => DlDef(Def::Mod(did)),
310 ForeignMod => DlDef(Def::ForeignMod(did)),
311 Variant(..) => {
d9579d0f 312 let enum_did = item_require_parent_item(cdata, item);
7453a54e 313 DlDef(Def::Variant(enum_did, did))
223e47cc 314 }
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315 Trait => DlDef(Def::Trait(did)),
316 Enum => DlDef(Def::Enum(did)),
c34b1796 317 Impl | DefaultImpl => DlImpl(did),
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318 PublicField | InheritedField => DlField,
319 }
320}
321
e9174d1e 322fn parse_unsafety(item_doc: rbml::Doc) -> hir::Unsafety {
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323 let unsafety_doc = reader::get_doc(item_doc, tag_unsafety);
324 if reader::doc_as_u8(unsafety_doc) != 0 {
e9174d1e 325 hir::Unsafety::Unsafe
1a4d82fc 326 } else {
e9174d1e 327 hir::Unsafety::Normal
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328 }
329}
330
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331fn parse_paren_sugar(item_doc: rbml::Doc) -> bool {
332 let paren_sugar_doc = reader::get_doc(item_doc, tag_paren_sugar);
333 reader::doc_as_u8(paren_sugar_doc) != 0
334}
335
e9174d1e 336fn parse_polarity(item_doc: rbml::Doc) -> hir::ImplPolarity {
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337 let polarity_doc = reader::get_doc(item_doc, tag_polarity);
338 if reader::doc_as_u8(polarity_doc) != 0 {
e9174d1e 339 hir::ImplPolarity::Negative
85aaf69f 340 } else {
e9174d1e 341 hir::ImplPolarity::Positive
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342 }
343}
344
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345fn parse_associated_type_names(item_doc: rbml::Doc) -> Vec<ast::Name> {
346 let names_doc = reader::get_doc(item_doc, tag_associated_type_names);
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347 reader::tagged_docs(names_doc, tag_associated_type_name)
348 .map(|name_doc| token::intern(name_doc.as_str_slice()))
349 .collect()
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350}
351
1a4d82fc 352pub fn get_trait_def<'tcx>(cdata: Cmd,
b039eaaf 353 item_id: DefIndex,
54a0048b 354 tcx: &TyCtxt<'tcx>) -> ty::TraitDef<'tcx>
970d7e83 355{
e9174d1e 356 let item_doc = cdata.lookup_item(item_id);
1a4d82fc 357 let generics = doc_generics(item_doc, tcx, cdata, tag_item_generics);
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358 let unsafety = parse_unsafety(item_doc);
359 let associated_type_names = parse_associated_type_names(item_doc);
85aaf69f 360 let paren_sugar = parse_paren_sugar(item_doc);
1a4d82fc 361
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362 ty::TraitDef::new(unsafety,
363 paren_sugar,
364 generics,
365 item_trait_ref(item_doc, tcx, cdata),
366 associated_type_names)
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367}
368
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369pub fn get_adt_def<'tcx>(intr: &IdentInterner,
370 cdata: Cmd,
b039eaaf 371 item_id: DefIndex,
54a0048b 372 tcx: &TyCtxt<'tcx>) -> ty::AdtDefMaster<'tcx>
e9174d1e 373{
54a0048b 374 fn expect_variant_kind(family: Family) -> ty::VariantKind {
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375 match family_to_variant_kind(family) {
376 Some(kind) => kind,
54a0048b 377 _ => bug!("unexpected family: {:?}", family),
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378 }
379 }
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380 fn get_enum_variants<'tcx>(intr: &IdentInterner,
381 cdata: Cmd,
54a0048b 382 doc: rbml::Doc) -> Vec<ty::VariantDefData<'tcx, 'tcx>> {
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383 let mut disr_val = 0;
384 reader::tagged_docs(doc, tag_items_data_item_variant).map(|p| {
385 let did = translated_def_id(cdata, p);
b039eaaf 386 let item = cdata.lookup_item(did.index);
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387
388 if let Some(disr) = variant_disr_val(item) {
389 disr_val = disr;
390 }
391 let disr = disr_val;
392 disr_val = disr_val.wrapping_add(1);
393
394 ty::VariantDefData {
395 did: did,
396 name: item_name(intr, item),
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397 fields: get_variant_fields(intr, cdata, item),
398 disr_val: ConstInt::Infer(disr),
399 kind: expect_variant_kind(item_family(item)),
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400 }
401 }).collect()
402 }
403 fn get_variant_fields<'tcx>(intr: &IdentInterner,
404 cdata: Cmd,
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405 doc: rbml::Doc) -> Vec<ty::FieldDefData<'tcx, 'tcx>> {
406 let mut index = 0;
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407 reader::tagged_docs(doc, tag_item_field).map(|f| {
408 let ff = item_family(f);
409 match ff {
410 PublicField | InheritedField => {},
54a0048b 411 _ => bug!("expected field, found {:?}", ff)
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412 };
413 ty::FieldDefData::new(item_def_id(f, cdata),
414 item_name(intr, f),
415 struct_field_family_to_visibility(ff))
416 }).chain(reader::tagged_docs(doc, tag_item_unnamed_field).map(|f| {
417 let ff = item_family(f);
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418 let name = intr.intern(&index.to_string());
419 index += 1;
420 ty::FieldDefData::new(item_def_id(f, cdata), name,
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421 struct_field_family_to_visibility(ff))
422 })).collect()
423 }
424 fn get_struct_variant<'tcx>(intr: &IdentInterner,
425 cdata: Cmd,
426 doc: rbml::Doc,
54a0048b 427 did: DefId) -> ty::VariantDefData<'tcx, 'tcx> {
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428 ty::VariantDefData {
429 did: did,
430 name: item_name(intr, doc),
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431 fields: get_variant_fields(intr, cdata, doc),
432 disr_val: ConstInt::Infer(0),
433 kind: expect_variant_kind(item_family(doc)),
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434 }
435 }
436
437 let doc = cdata.lookup_item(item_id);
b039eaaf 438 let did = DefId { krate: cdata.cnum, index: item_id };
e9174d1e 439 let (kind, variants) = match item_family(doc) {
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440 Enum => {
441 (ty::AdtKind::Enum,
54a0048b 442 get_enum_variants(intr, cdata, doc))
b039eaaf 443 }
7453a54e 444 Struct(..) => {
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445 let ctor_did =
446 reader::maybe_get_doc(doc, tag_items_data_item_struct_ctor).
447 map_or(did, |ctor_doc| translated_def_id(cdata, ctor_doc));
448 (ty::AdtKind::Struct,
54a0048b 449 vec![get_struct_variant(intr, cdata, doc, ctor_did)])
b039eaaf 450 }
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451 _ => bug!("get_adt_def called on a non-ADT {:?} - {:?}",
452 item_family(doc), did)
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453 };
454
455 let adt = tcx.intern_adt_def(did, kind, variants);
456
457 // this needs to be done *after* the variant is interned,
458 // to support recursive structures
459 for variant in &adt.variants {
460 if variant.kind() == ty::VariantKind::Tuple &&
461 adt.adt_kind() == ty::AdtKind::Enum {
462 // tuple-like enum variant fields aren't real items - get the types
463 // from the ctor.
464 debug!("evaluating the ctor-type of {:?}",
465 variant.name);
b039eaaf 466 let ctor_ty = get_type(cdata, variant.did.index, tcx).ty;
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467 debug!("evaluating the ctor-type of {:?}.. {:?}",
468 variant.name,
469 ctor_ty);
470 let field_tys = match ctor_ty.sty {
54a0048b 471 ty::TyFnDef(_, _, &ty::BareFnTy { sig: ty::Binder(ty::FnSig {
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472 ref inputs, ..
473 }), ..}) => {
474 // tuple-struct constructors don't have escaping regions
475 assert!(!inputs.has_escaping_regions());
476 inputs
477 },
54a0048b 478 _ => bug!("tuple-variant ctor is not an ADT")
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479 };
480 for (field, &ty) in variant.fields.iter().zip(field_tys.iter()) {
481 field.fulfill_ty(ty);
482 }
483 } else {
484 for field in &variant.fields {
485 debug!("evaluating the type of {:?}::{:?}", variant.name, field.name);
b039eaaf 486 let ty = get_type(cdata, field.did.index, tcx).ty;
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487 field.fulfill_ty(ty);
488 debug!("evaluating the type of {:?}::{:?}: {:?}",
489 variant.name, field.name, ty);
490 }
491 }
492 }
493
494 adt
495}
496
85aaf69f 497pub fn get_predicates<'tcx>(cdata: Cmd,
b039eaaf 498 item_id: DefIndex,
54a0048b 499 tcx: &TyCtxt<'tcx>)
85aaf69f
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500 -> ty::GenericPredicates<'tcx>
501{
e9174d1e 502 let item_doc = cdata.lookup_item(item_id);
85aaf69f
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503 doc_predicates(item_doc, tcx, cdata, tag_item_generics)
504}
223e47cc 505
c34b1796 506pub fn get_super_predicates<'tcx>(cdata: Cmd,
b039eaaf 507 item_id: DefIndex,
54a0048b 508 tcx: &TyCtxt<'tcx>)
c34b1796
AL
509 -> ty::GenericPredicates<'tcx>
510{
e9174d1e 511 let item_doc = cdata.lookup_item(item_id);
c34b1796
AL
512 doc_predicates(item_doc, tcx, cdata, tag_item_super_predicates)
513}
514
54a0048b 515pub fn get_type<'tcx>(cdata: Cmd, id: DefIndex, tcx: &TyCtxt<'tcx>)
85aaf69f
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516 -> ty::TypeScheme<'tcx>
517{
e9174d1e 518 let item_doc = cdata.lookup_item(id);
b039eaaf 519 let t = item_type(DefId { krate: cdata.cnum, index: id }, item_doc, tcx,
223e47cc 520 cdata);
85aaf69f 521 let generics = doc_generics(item_doc, tcx, cdata, tag_item_generics);
1a4d82fc
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522 ty::TypeScheme {
523 generics: generics,
223e47cc
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524 ty: t
525 }
526}
527
b039eaaf 528pub fn get_stability(cdata: Cmd, id: DefIndex) -> Option<attr::Stability> {
e9174d1e 529 let item = cdata.lookup_item(id);
1a4d82fc
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530 reader::maybe_get_doc(item, tag_items_data_item_stability).map(|doc| {
531 let mut decoder = reader::Decoder::new(doc);
532 Decodable::decode(&mut decoder).unwrap()
533 })
223e47cc
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534}
535
9cc50fc6
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536pub fn get_deprecation(cdata: Cmd, id: DefIndex) -> Option<attr::Deprecation> {
537 let item = cdata.lookup_item(id);
538 reader::maybe_get_doc(item, tag_items_data_item_deprecation).map(|doc| {
539 let mut decoder = reader::Decoder::new(doc);
540 Decodable::decode(&mut decoder).unwrap()
541 })
542}
543
54a0048b
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544pub fn get_visibility(cdata: Cmd, id: DefIndex) -> ty::Visibility {
545 item_visibility(cdata.lookup_item(id))
546}
547
548pub fn get_parent_impl(cdata: Cmd, id: DefIndex) -> Option<DefId> {
549 let item = cdata.lookup_item(id);
550 reader::maybe_get_doc(item, tag_items_data_parent_impl).map(|doc| {
551 translated_def_id(cdata, doc)
552 })
553}
554
b039eaaf 555pub fn get_repr_attrs(cdata: Cmd, id: DefIndex) -> Vec<attr::ReprAttr> {
e9174d1e 556 let item = cdata.lookup_item(id);
1a4d82fc
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557 match reader::maybe_get_doc(item, tag_items_data_item_repr).map(|doc| {
558 let mut decoder = reader::Decoder::new(doc);
559 Decodable::decode(&mut decoder).unwrap()
560 }) {
561 Some(attrs) => attrs,
562 None => Vec::new(),
563 }
223e47cc
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564}
565
85aaf69f 566pub fn get_impl_polarity<'tcx>(cdata: Cmd,
b039eaaf 567 id: DefIndex)
e9174d1e 568 -> Option<hir::ImplPolarity>
85aaf69f 569{
e9174d1e 570 let item_doc = cdata.lookup_item(id);
85aaf69f
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571 let fam = item_family(item_doc);
572 match fam {
573 Family::Impl => {
574 Some(parse_polarity(item_doc))
575 }
576 _ => None
577 }
578}
579
e9174d1e
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580pub fn get_custom_coerce_unsized_kind<'tcx>(
581 cdata: Cmd,
b039eaaf 582 id: DefIndex)
e9174d1e
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583 -> Option<ty::adjustment::CustomCoerceUnsized>
584{
585 let item_doc = cdata.lookup_item(id);
d9579d0f
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586 reader::maybe_get_doc(item_doc, tag_impl_coerce_unsized_kind).map(|kind_doc| {
587 let mut decoder = reader::Decoder::new(kind_doc);
588 Decodable::decode(&mut decoder).unwrap()
589 })
590}
591
1a4d82fc 592pub fn get_impl_trait<'tcx>(cdata: Cmd,
b039eaaf 593 id: DefIndex,
54a0048b 594 tcx: &TyCtxt<'tcx>)
d9579d0f 595 -> Option<ty::TraitRef<'tcx>>
970d7e83 596{
e9174d1e 597 let item_doc = cdata.lookup_item(id);
1a4d82fc
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598 let fam = item_family(item_doc);
599 match fam {
c34b1796 600 Family::Impl | Family::DefaultImpl => {
1a4d82fc
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601 reader::maybe_get_doc(item_doc, tag_item_trait_ref).map(|tp| {
602 doc_trait_ref(tp, tcx, cdata)
603 })
604 }
605 _ => None
970d7e83 606 }
223e47cc
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607}
608
b039eaaf 609pub fn get_symbol(cdata: Cmd, id: DefIndex) -> String {
e9174d1e
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610 return item_symbol(cdata.lookup_item(id));
611}
612
613/// If you have a crate_metadata, call get_symbol instead
b039eaaf 614pub fn get_symbol_from_buf(data: &[u8], id: DefIndex) -> String {
e9174d1e
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615 let index = load_index(data);
616 let pos = index.lookup_item(data, id).unwrap();
617 let doc = reader::doc_at(data, pos as usize).unwrap().doc;
618 item_symbol(doc)
223e47cc
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619}
620
223e47cc 621/// Iterates over the language items in the given crate.
1a4d82fc 622pub fn each_lang_item<F>(cdata: Cmd, mut f: F) -> bool where
b039eaaf 623 F: FnMut(DefIndex, usize) -> bool,
1a4d82fc
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624{
625 let root = rbml::Doc::new(cdata.data());
223e47cc 626 let lang_items = reader::get_doc(root, tag_lang_items);
62682a34 627 reader::tagged_docs(lang_items, tag_lang_items_item).all(|item_doc| {
223e47cc 628 let id_doc = reader::get_doc(item_doc, tag_lang_items_item_id);
c34b1796 629 let id = reader::doc_as_u32(id_doc) as usize;
b039eaaf
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630 let index_doc = reader::get_doc(item_doc, tag_lang_items_item_index);
631 let index = DefIndex::from_u32(reader::doc_as_u32(index_doc));
223e47cc 632
b039eaaf 633 f(index, id)
1a4d82fc 634 })
223e47cc
LB
635}
636
1a4d82fc
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637fn each_child_of_item_or_crate<F, G>(intr: Rc<IdentInterner>,
638 cdata: Cmd,
639 item_doc: rbml::Doc,
640 mut get_crate_data: G,
641 mut callback: F) where
54a0048b 642 F: FnMut(DefLike, ast::Name, ty::Visibility),
1a4d82fc
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643 G: FnMut(ast::CrateNum) -> Rc<crate_metadata>,
644{
645 // Iterate over all children.
62682a34 646 for child_info_doc in reader::tagged_docs(item_doc, tag_mod_child) {
d9579d0f 647 let child_def_id = translated_def_id(cdata, child_info_doc);
1a4d82fc
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648
649 // This item may be in yet another crate if it was the child of a
650 // reexport.
651 let crate_data = if child_def_id.krate == cdata.cnum {
652 None
653 } else {
654 Some(get_crate_data(child_def_id.krate))
655 };
656 let crate_data = match crate_data {
657 Some(ref cdata) => &**cdata,
658 None => cdata
659 };
970d7e83 660
1a4d82fc 661 // Get the item.
b039eaaf 662 match crate_data.get_item(child_def_id.index) {
1a4d82fc
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663 None => {}
664 Some(child_item_doc) => {
665 // Hand off the item to the callback.
7453a54e 666 let child_name = item_name(&intr, child_item_doc);
d9579d0f 667 let def_like = item_to_def_like(crate_data, child_item_doc, child_def_id);
1a4d82fc
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668 let visibility = item_visibility(child_item_doc);
669 callback(def_like, child_name, visibility);
970d7e83
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670 }
671 }
62682a34 672 }
1a4d82fc
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673
674 // As a special case, iterate over all static methods of
675 // associated implementations too. This is a bit of a botch.
676 // --pcwalton
62682a34
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677 for inherent_impl_def_id_doc in reader::tagged_docs(item_doc,
678 tag_items_data_item_inherent_impl) {
679 let inherent_impl_def_id = item_def_id(inherent_impl_def_id_doc, cdata);
b039eaaf 680 if let Some(inherent_impl_doc) = cdata.get_item(inherent_impl_def_id.index) {
62682a34
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681 for impl_item_def_id_doc in reader::tagged_docs(inherent_impl_doc,
682 tag_item_impl_item) {
1a4d82fc
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683 let impl_item_def_id = item_def_id(impl_item_def_id_doc,
684 cdata);
b039eaaf 685 if let Some(impl_method_doc) = cdata.get_item(impl_item_def_id.index) {
1a4d82fc
JJ
686 if let StaticMethod = item_family(impl_method_doc) {
687 // Hand off the static method to the callback.
7453a54e 688 let static_method_name = item_name(&intr, impl_method_doc);
d9579d0f
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689 let static_method_def_like = item_to_def_like(cdata, impl_method_doc,
690 impl_item_def_id);
1a4d82fc
JJ
691 callback(static_method_def_like,
692 static_method_name,
693 item_visibility(impl_method_doc));
694 }
223e47cc 695 }
62682a34 696 }
970d7e83 697 }
62682a34 698 }
1a4d82fc 699
62682a34 700 for reexport_doc in reexports(item_doc) {
1a4d82fc
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701 let def_id_doc = reader::get_doc(reexport_doc,
702 tag_items_data_item_reexport_def_id);
d9579d0f 703 let child_def_id = translated_def_id(cdata, def_id_doc);
1a4d82fc
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704
705 let name_doc = reader::get_doc(reexport_doc,
706 tag_items_data_item_reexport_name);
707 let name = name_doc.as_str_slice();
708
709 // This reexport may be in yet another crate.
710 let crate_data = if child_def_id.krate == cdata.cnum {
711 None
970d7e83 712 } else {
1a4d82fc 713 Some(get_crate_data(child_def_id.krate))
970d7e83 714 };
1a4d82fc
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715 let crate_data = match crate_data {
716 Some(ref cdata) => &**cdata,
717 None => cdata
970d7e83
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718 };
719
1a4d82fc 720 // Get the item.
b039eaaf 721 if let Some(child_item_doc) = crate_data.get_item(child_def_id.index) {
1a4d82fc 722 // Hand off the item to the callback.
d9579d0f 723 let def_like = item_to_def_like(crate_data, child_item_doc, child_def_id);
1a4d82fc
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724 // These items have a public visibility because they're part of
725 // a public re-export.
54a0048b 726 callback(def_like, token::intern(name), ty::Visibility::Public);
970d7e83 727 }
62682a34 728 }
1a4d82fc 729}
970d7e83 730
1a4d82fc
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731/// Iterates over each child of the given item.
732pub fn each_child_of_item<F, G>(intr: Rc<IdentInterner>,
733 cdata: Cmd,
b039eaaf 734 id: DefIndex,
1a4d82fc
JJ
735 get_crate_data: G,
736 callback: F) where
54a0048b 737 F: FnMut(DefLike, ast::Name, ty::Visibility),
1a4d82fc
JJ
738 G: FnMut(ast::CrateNum) -> Rc<crate_metadata>,
739{
740 // Find the item.
e9174d1e 741 let item_doc = match cdata.get_item(id) {
1a4d82fc
JJ
742 None => return,
743 Some(item_doc) => item_doc,
744 };
970d7e83 745
1a4d82fc
JJ
746 each_child_of_item_or_crate(intr,
747 cdata,
748 item_doc,
749 get_crate_data,
750 callback)
223e47cc
LB
751}
752
1a4d82fc
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753/// Iterates over all the top-level crate items.
754pub fn each_top_level_item_of_crate<F, G>(intr: Rc<IdentInterner>,
755 cdata: Cmd,
756 get_crate_data: G,
757 callback: F) where
54a0048b 758 F: FnMut(DefLike, ast::Name, ty::Visibility),
1a4d82fc
JJ
759 G: FnMut(ast::CrateNum) -> Rc<crate_metadata>,
760{
761 let root_doc = rbml::Doc::new(cdata.data());
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762 let misc_info_doc = reader::get_doc(root_doc, tag_misc_info);
763 let crate_items_doc = reader::get_doc(misc_info_doc,
764 tag_misc_info_crate_items);
765
1a4d82fc
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766 each_child_of_item_or_crate(intr,
767 cdata,
768 crate_items_doc,
769 get_crate_data,
770 callback)
771}
772
b039eaaf 773pub fn get_item_name(intr: &IdentInterner, cdata: Cmd, id: DefIndex) -> ast::Name {
e9174d1e 774 item_name(intr, cdata.lookup_item(id))
1a4d82fc
JJ
775}
776
54a0048b 777pub fn maybe_get_item_ast<'tcx>(cdata: Cmd, tcx: &TyCtxt<'tcx>, id: DefIndex)
92a42be0 778 -> FoundAst<'tcx> {
b039eaaf 779 debug!("Looking up item: {:?}", id);
e9174d1e 780 let item_doc = cdata.lookup_item(id);
b039eaaf 781 let item_did = item_def_id(item_doc, cdata);
54a0048b
SL
782 let parent_def_id = DefId {
783 krate: cdata.cnum,
784 index: def_key(cdata, id).parent.unwrap()
9cc50fc6 785 };
54a0048b
SL
786 let mut parent_def_path = def_path(cdata, id);
787 parent_def_path.data.pop();
788 if let Some(ast_doc) = reader::maybe_get_doc(item_doc, tag_ast as usize) {
789 let ii = decode_inlined_item(cdata,
790 tcx,
791 parent_def_path,
792 parent_def_id,
793 ast_doc,
794 item_did);
795 return FoundAst::Found(ii);
796 } else if let Some(parent_did) = item_parent_item(cdata, item_doc) {
797 // Remove the last element from the paths, since we are now
798 // trying to inline the parent.
799 let grandparent_def_id = DefId {
800 krate: cdata.cnum,
801 index: def_key(cdata, parent_def_id.index).parent.unwrap()
802 };
803 let mut grandparent_def_path = parent_def_path;
804 grandparent_def_path.data.pop();
805 let parent_doc = cdata.lookup_item(parent_did.index);
806 if let Some(ast_doc) = reader::maybe_get_doc(parent_doc, tag_ast as usize) {
807 let ii = decode_inlined_item(cdata,
808 tcx,
809 grandparent_def_path,
810 grandparent_def_id,
811 ast_doc,
812 parent_did);
813 if let &InlinedItem::Item(ref i) = ii {
814 return FoundAst::FoundParent(parent_did, i);
223e47cc 815 }
223e47cc 816 }
223e47cc 817 }
54a0048b 818 FoundAst::NotFound
223e47cc
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819}
820
7453a54e
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821pub fn is_item_mir_available<'tcx>(cdata: Cmd, id: DefIndex) -> bool {
822 if let Some(item_doc) = cdata.get_item(id) {
823 return reader::maybe_get_doc(item_doc, tag_mir as usize).is_some();
824 }
825
826 false
827}
828
9cc50fc6 829pub fn maybe_get_item_mir<'tcx>(cdata: Cmd,
54a0048b 830 tcx: &TyCtxt<'tcx>,
9cc50fc6
SL
831 id: DefIndex)
832 -> Option<mir::repr::Mir<'tcx>> {
833 let item_doc = cdata.lookup_item(id);
834
835 return reader::maybe_get_doc(item_doc, tag_mir as usize).map(|mir_doc| {
836 let dcx = tls_context::DecodingContext {
837 crate_metadata: cdata,
838 tcx: tcx,
839 };
840 let mut decoder = reader::Decoder::new(mir_doc);
841
842 let mut mir = decoder.read_opaque(|opaque_decoder, _| {
843 tls::enter_decoding_context(&dcx, opaque_decoder, |_, opaque_decoder| {
844 Decodable::decode(opaque_decoder)
845 })
846 }).unwrap();
847
7453a54e
SL
848 assert!(decoder.position() == mir_doc.end);
849
9cc50fc6
SL
850 let mut def_id_and_span_translator = MirDefIdAndSpanTranslator {
851 crate_metadata: cdata,
852 codemap: tcx.sess.codemap(),
853 last_filemap_index_hint: Cell::new(0),
854 };
855
856 def_id_and_span_translator.visit_mir(&mut mir);
857
858 mir
859 });
860
861 struct MirDefIdAndSpanTranslator<'cdata, 'codemap> {
862 crate_metadata: Cmd<'cdata>,
863 codemap: &'codemap codemap::CodeMap,
864 last_filemap_index_hint: Cell<usize>
865 }
866
867 impl<'v, 'cdata, 'codemap> mir::visit::MutVisitor<'v>
868 for MirDefIdAndSpanTranslator<'cdata, 'codemap>
869 {
870 fn visit_def_id(&mut self, def_id: &mut DefId) {
871 *def_id = translate_def_id(self.crate_metadata, *def_id);
872 }
873
874 fn visit_span(&mut self, span: &mut Span) {
875 *span = translate_span(self.crate_metadata,
876 self.codemap,
877 &self.last_filemap_index_hint,
878 *span);
879 }
880 }
881}
882
1a4d82fc 883fn get_explicit_self(item: rbml::Doc) -> ty::ExplicitSelfCategory {
e9174d1e 884 fn get_mutability(ch: u8) -> hir::Mutability {
223e47cc 885 match ch as char {
e9174d1e
SL
886 'i' => hir::MutImmutable,
887 'm' => hir::MutMutable,
54a0048b 888 _ => bug!("unknown mutability character: `{}`", ch as char),
223e47cc
LB
889 }
890 }
891
970d7e83
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892 let explicit_self_doc = reader::get_doc(item, tag_item_trait_method_explicit_self);
893 let string = explicit_self_doc.as_str_slice();
223e47cc 894
1a4d82fc 895 let explicit_self_kind = string.as_bytes()[0];
970d7e83 896 match explicit_self_kind as char {
9cc50fc6
SL
897 's' => ty::ExplicitSelfCategory::Static,
898 'v' => ty::ExplicitSelfCategory::ByValue,
899 '~' => ty::ExplicitSelfCategory::ByBox,
1a4d82fc 900 // FIXME(#4846) expl. region
223e47cc 901 '&' => {
9cc50fc6 902 ty::ExplicitSelfCategory::ByReference(
1a4d82fc
JJ
903 ty::ReEmpty,
904 get_mutability(string.as_bytes()[1]))
223e47cc 905 }
54a0048b 906 _ => bug!("unknown self type code: `{}`", explicit_self_kind as char)
223e47cc
LB
907 }
908}
909
1a4d82fc 910/// Returns the def IDs of all the items in the given implementation.
b039eaaf 911pub fn get_impl_items(cdata: Cmd, impl_id: DefIndex)
1a4d82fc 912 -> Vec<ty::ImplOrTraitItemId> {
e9174d1e 913 reader::tagged_docs(cdata.lookup_item(impl_id), tag_item_impl_item).map(|doc| {
1a4d82fc
JJ
914 let def_id = item_def_id(doc, cdata);
915 match item_sort(doc) {
b039eaaf 916 Some('C') | Some('c') => ty::ConstTraitItemId(def_id),
62682a34
SL
917 Some('r') | Some('p') => ty::MethodTraitItemId(def_id),
918 Some('t') => ty::TypeTraitItemId(def_id),
54a0048b 919 _ => bug!("unknown impl item sort"),
1a4d82fc 920 }
62682a34 921 }).collect()
1a4d82fc
JJ
922}
923
924pub fn get_trait_name(intr: Rc<IdentInterner>,
925 cdata: Cmd,
b039eaaf 926 id: DefIndex)
1a4d82fc 927 -> ast::Name {
e9174d1e 928 let doc = cdata.lookup_item(id);
7453a54e 929 item_name(&intr, doc)
1a4d82fc
JJ
930}
931
b039eaaf 932pub fn is_static_method(cdata: Cmd, id: DefIndex) -> bool {
e9174d1e 933 let doc = cdata.lookup_item(id);
1a4d82fc 934 match item_sort(doc) {
c34b1796 935 Some('r') | Some('p') => {
9cc50fc6 936 get_explicit_self(doc) == ty::ExplicitSelfCategory::Static
1a4d82fc 937 }
c34b1796 938 _ => false
223e47cc 939 }
223e47cc
LB
940}
941
1a4d82fc
JJ
942pub fn get_impl_or_trait_item<'tcx>(intr: Rc<IdentInterner>,
943 cdata: Cmd,
b039eaaf 944 id: DefIndex,
54a0048b
SL
945 tcx: &TyCtxt<'tcx>)
946 -> Option<ty::ImplOrTraitItem<'tcx>> {
e9174d1e 947 let item_doc = cdata.lookup_item(id);
970d7e83 948
62682a34 949 let def_id = item_def_id(item_doc, cdata);
1a4d82fc 950
54a0048b
SL
951 let container_id = if let Some(id) = item_parent_item(cdata, item_doc) {
952 id
953 } else {
954 return None;
955 };
b039eaaf 956 let container_doc = cdata.lookup_item(container_id.index);
1a4d82fc
JJ
957 let container = match item_family(container_doc) {
958 Trait => TraitContainer(container_id),
959 _ => ImplContainer(container_id),
960 };
961
7453a54e 962 let name = item_name(&intr, item_doc);
62682a34 963 let vis = item_visibility(item_doc);
54a0048b 964 let defaultness = item_defaultness(item_doc);
1a4d82fc 965
54a0048b 966 Some(match item_sort(item_doc) {
b039eaaf 967 sort @ Some('C') | sort @ Some('c') => {
62682a34 968 let ty = doc_type(item_doc, tcx, cdata);
d9579d0f
AL
969 ty::ConstTraitItem(Rc::new(ty::AssociatedConst {
970 name: name,
971 ty: ty,
972 vis: vis,
54a0048b 973 defaultness: defaultness,
d9579d0f
AL
974 def_id: def_id,
975 container: container,
b039eaaf 976 has_value: sort == Some('C')
d9579d0f
AL
977 }))
978 }
c34b1796 979 Some('r') | Some('p') => {
62682a34
SL
980 let generics = doc_generics(item_doc, tcx, cdata, tag_method_ty_generics);
981 let predicates = doc_predicates(item_doc, tcx, cdata, tag_method_ty_generics);
b039eaaf
SL
982 let ity = tcx.lookup_item_type(def_id).ty;
983 let fty = match ity.sty {
54a0048b
SL
984 ty::TyFnDef(_, _, fty) => fty.clone(),
985 _ => bug!(
b039eaaf 986 "the type {:?} of the method {:?} is not a function?",
54a0048b 987 ity, name)
b039eaaf 988 };
62682a34 989 let explicit_self = get_explicit_self(item_doc);
1a4d82fc
JJ
990
991 ty::MethodTraitItem(Rc::new(ty::Method::new(name,
992 generics,
85aaf69f 993 predicates,
1a4d82fc
JJ
994 fty,
995 explicit_self,
996 vis,
54a0048b 997 defaultness,
1a4d82fc 998 def_id,
b039eaaf 999 container)))
1a4d82fc 1000 }
c34b1796 1001 Some('t') => {
62682a34 1002 let ty = maybe_doc_type(item_doc, tcx, cdata);
1a4d82fc
JJ
1003 ty::TypeTraitItem(Rc::new(ty::AssociatedType {
1004 name: name,
62682a34 1005 ty: ty,
1a4d82fc 1006 vis: vis,
54a0048b 1007 defaultness: defaultness,
1a4d82fc
JJ
1008 def_id: def_id,
1009 container: container,
1010 }))
1011 }
54a0048b
SL
1012 _ => return None
1013 })
1a4d82fc
JJ
1014}
1015
b039eaaf 1016pub fn get_trait_item_def_ids(cdata: Cmd, id: DefIndex)
1a4d82fc 1017 -> Vec<ty::ImplOrTraitItemId> {
e9174d1e 1018 let item = cdata.lookup_item(id);
62682a34 1019 reader::tagged_docs(item, tag_item_trait_item).map(|mth| {
1a4d82fc
JJ
1020 let def_id = item_def_id(mth, cdata);
1021 match item_sort(mth) {
b039eaaf 1022 Some('C') | Some('c') => ty::ConstTraitItemId(def_id),
62682a34
SL
1023 Some('r') | Some('p') => ty::MethodTraitItemId(def_id),
1024 Some('t') => ty::TypeTraitItemId(def_id),
54a0048b 1025 _ => bug!("unknown trait item sort"),
1a4d82fc 1026 }
62682a34 1027 }).collect()
223e47cc
LB
1028}
1029
b039eaaf 1030pub fn get_item_variances(cdata: Cmd, id: DefIndex) -> ty::ItemVariances {
e9174d1e 1031 let item_doc = cdata.lookup_item(id);
1a4d82fc
JJ
1032 let variance_doc = reader::get_doc(item_doc, tag_item_variances);
1033 let mut decoder = reader::Decoder::new(variance_doc);
1034 Decodable::decode(&mut decoder).unwrap()
1035}
1036
1037pub fn get_provided_trait_methods<'tcx>(intr: Rc<IdentInterner>,
1038 cdata: Cmd,
b039eaaf 1039 id: DefIndex,
54a0048b 1040 tcx: &TyCtxt<'tcx>)
1a4d82fc 1041 -> Vec<Rc<ty::Method<'tcx>>> {
e9174d1e 1042 let item = cdata.lookup_item(id);
223e47cc 1043
62682a34 1044 reader::tagged_docs(item, tag_item_trait_item).filter_map(|mth_id| {
970d7e83 1045 let did = item_def_id(mth_id, cdata);
b039eaaf 1046 let mth = cdata.lookup_item(did.index);
223e47cc 1047
c34b1796 1048 if item_sort(mth) == Some('p') {
1a4d82fc
JJ
1049 let trait_item = get_impl_or_trait_item(intr.clone(),
1050 cdata,
b039eaaf 1051 did.index,
1a4d82fc 1052 tcx);
54a0048b 1053 if let Some(ty::MethodTraitItem(ref method)) = trait_item {
62682a34
SL
1054 Some((*method).clone())
1055 } else {
1056 None
1a4d82fc 1057 }
62682a34
SL
1058 } else {
1059 None
1a4d82fc 1060 }
62682a34 1061 }).collect()
223e47cc
LB
1062}
1063
d9579d0f
AL
1064pub fn get_associated_consts<'tcx>(intr: Rc<IdentInterner>,
1065 cdata: Cmd,
b039eaaf 1066 id: DefIndex,
54a0048b 1067 tcx: &TyCtxt<'tcx>)
d9579d0f 1068 -> Vec<Rc<ty::AssociatedConst<'tcx>>> {
e9174d1e 1069 let item = cdata.lookup_item(id);
d9579d0f 1070
62682a34
SL
1071 [tag_item_trait_item, tag_item_impl_item].iter().flat_map(|&tag| {
1072 reader::tagged_docs(item, tag).filter_map(|ac_id| {
d9579d0f 1073 let did = item_def_id(ac_id, cdata);
b039eaaf
SL
1074 let ac_doc = cdata.lookup_item(did.index);
1075
1076 match item_sort(ac_doc) {
1077 Some('C') | Some('c') => {
1078 let trait_item = get_impl_or_trait_item(intr.clone(),
1079 cdata,
1080 did.index,
1081 tcx);
54a0048b 1082 if let Some(ty::ConstTraitItem(ref ac)) = trait_item {
b039eaaf
SL
1083 Some((*ac).clone())
1084 } else {
1085 None
1086 }
d9579d0f 1087 }
b039eaaf 1088 _ => None
d9579d0f 1089 }
62682a34
SL
1090 })
1091 }).collect()
d9579d0f
AL
1092}
1093
7453a54e
SL
1094pub fn get_variant_kind(cdata: Cmd, node_id: DefIndex) -> Option<VariantKind>
1095{
1096 let item = cdata.lookup_item(node_id);
1097 family_to_variant_kind(item_family(item))
1098}
1099
1100pub fn get_struct_ctor_def_id(cdata: Cmd, node_id: DefIndex) -> Option<DefId>
1101{
1102 let item = cdata.lookup_item(node_id);
1103 reader::maybe_get_doc(item, tag_items_data_item_struct_ctor).
1104 map(|ctor_doc| translated_def_id(cdata, ctor_doc))
1105}
1106
1a4d82fc
JJ
1107/// If node_id is the constructor of a tuple struct, retrieve the NodeId of
1108/// the actual type definition, otherwise, return None
1109pub fn get_tuple_struct_definition_if_ctor(cdata: Cmd,
b039eaaf 1110 node_id: DefIndex)
e9174d1e 1111 -> Option<DefId>
1a4d82fc 1112{
e9174d1e 1113 let item = cdata.lookup_item(node_id);
62682a34
SL
1114 reader::tagged_docs(item, tag_items_data_item_is_tuple_struct_ctor).next().map(|_| {
1115 item_require_parent_item(cdata, item)
1116 })
1a4d82fc
JJ
1117}
1118
85aaf69f 1119pub fn get_item_attrs(cdata: Cmd,
b039eaaf
SL
1120 orig_node_id: DefIndex)
1121 -> Vec<ast::Attribute> {
1a4d82fc
JJ
1122 // The attributes for a tuple struct are attached to the definition, not the ctor;
1123 // we assume that someone passing in a tuple struct ctor is actually wanting to
1124 // look at the definition
1125 let node_id = get_tuple_struct_definition_if_ctor(cdata, orig_node_id);
b039eaaf 1126 let node_id = node_id.map(|x| x.index).unwrap_or(orig_node_id);
e9174d1e 1127 let item = cdata.lookup_item(node_id);
85aaf69f 1128 get_attributes(item)
1a4d82fc
JJ
1129}
1130
b039eaaf 1131pub fn get_struct_field_attrs(cdata: Cmd) -> FnvHashMap<DefId, Vec<ast::Attribute>> {
1a4d82fc
JJ
1132 let data = rbml::Doc::new(cdata.data());
1133 let fields = reader::get_doc(data, tag_struct_fields);
62682a34 1134 reader::tagged_docs(fields, tag_struct_field).map(|field| {
b039eaaf 1135 let def_id = translated_def_id(cdata, reader::get_doc(field, tag_def_id));
1a4d82fc 1136 let attrs = get_attributes(field);
b039eaaf 1137 (def_id, attrs)
62682a34 1138 }).collect()
1a4d82fc
JJ
1139}
1140
54a0048b 1141fn struct_field_family_to_visibility(family: Family) -> ty::Visibility {
223e47cc 1142 match family {
54a0048b
SL
1143 PublicField => ty::Visibility::Public,
1144 InheritedField => ty::Visibility::PrivateExternal,
1145 _ => bug!()
223e47cc
LB
1146 }
1147}
1148
b039eaaf 1149pub fn get_struct_field_names(intr: &IdentInterner, cdata: Cmd, id: DefIndex)
e9174d1e
SL
1150 -> Vec<ast::Name> {
1151 let item = cdata.lookup_item(id);
54a0048b 1152 let mut index = 0;
e9174d1e
SL
1153 reader::tagged_docs(item, tag_item_field).map(|an_item| {
1154 item_name(intr, an_item)
1155 }).chain(reader::tagged_docs(item, tag_item_unnamed_field).map(|_| {
54a0048b
SL
1156 let name = intr.intern(&index.to_string());
1157 index += 1;
1158 name
62682a34 1159 })).collect()
223e47cc
LB
1160}
1161
b039eaaf 1162fn get_meta_items(md: rbml::Doc) -> Vec<P<ast::MetaItem>> {
62682a34 1163 reader::tagged_docs(md, tag_meta_item_word).map(|meta_item_doc| {
223e47cc 1164 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1a4d82fc 1165 let n = token::intern_and_get_ident(nd.as_str_slice());
62682a34
SL
1166 attr::mk_word_item(n)
1167 }).chain(reader::tagged_docs(md, tag_meta_item_name_value).map(|meta_item_doc| {
223e47cc
LB
1168 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1169 let vd = reader::get_doc(meta_item_doc, tag_meta_item_value);
1a4d82fc
JJ
1170 let n = token::intern_and_get_ident(nd.as_str_slice());
1171 let v = token::intern_and_get_ident(vd.as_str_slice());
7453a54e 1172 // FIXME (#623): Should be able to decode MetaItemKind::NameValue variants,
223e47cc 1173 // but currently the encoder just drops them
62682a34
SL
1174 attr::mk_name_value_item_str(n, v)
1175 })).chain(reader::tagged_docs(md, tag_meta_item_list).map(|meta_item_doc| {
223e47cc 1176 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1a4d82fc 1177 let n = token::intern_and_get_ident(nd.as_str_slice());
223e47cc 1178 let subitems = get_meta_items(meta_item_doc);
62682a34
SL
1179 attr::mk_list_item(n, subitems)
1180 })).collect()
223e47cc
LB
1181}
1182
b039eaaf 1183fn get_attributes(md: rbml::Doc) -> Vec<ast::Attribute> {
223e47cc 1184 match reader::maybe_get_doc(md, tag_attributes) {
62682a34
SL
1185 Some(attrs_d) => {
1186 reader::tagged_docs(attrs_d, tag_attribute).map(|attr_doc| {
1187 let is_sugared_doc = reader::doc_as_u8(
1188 reader::get_doc(attr_doc, tag_attribute_is_sugared_doc)
1189 ) == 1;
1190 let meta_items = get_meta_items(attr_doc);
1191 // Currently it's only possible to have a single meta item on
1192 // an attribute
1193 assert_eq!(meta_items.len(), 1);
1194 let meta_item = meta_items.into_iter().nth(0).unwrap();
1a4d82fc 1195 codemap::Spanned {
b039eaaf 1196 node: ast::Attribute_ {
1a4d82fc 1197 id: attr::mk_attr_id(),
b039eaaf 1198 style: ast::AttrStyle::Outer,
223e47cc 1199 value: meta_item,
1a4d82fc 1200 is_sugared_doc: is_sugared_doc,
223e47cc 1201 },
1a4d82fc 1202 span: codemap::DUMMY_SP
62682a34
SL
1203 }
1204 }).collect()
1205 },
1206 None => vec![],
223e47cc 1207 }
223e47cc
LB
1208}
1209
1a4d82fc 1210fn list_crate_attributes(md: rbml::Doc, hash: &Svh,
c34b1796 1211 out: &mut io::Write) -> io::Result<()> {
54a0048b 1212 write!(out, "=Crate Attributes ({})=\n", *hash)?;
223e47cc 1213
970d7e83 1214 let r = get_attributes(md);
85aaf69f 1215 for attr in &r {
54a0048b 1216 write!(out, "{}\n", pprust::attribute_to_string(attr))?;
223e47cc
LB
1217 }
1218
1a4d82fc 1219 write!(out, "\n\n")
223e47cc
LB
1220}
1221
b039eaaf 1222pub fn get_crate_attributes(data: &[u8]) -> Vec<ast::Attribute> {
1a4d82fc 1223 get_attributes(rbml::Doc::new(data))
223e47cc
LB
1224}
1225
1a4d82fc
JJ
1226#[derive(Clone)]
1227pub struct CrateDep {
1228 pub cnum: ast::CrateNum,
1229 pub name: String,
1230 pub hash: Svh,
e9174d1e 1231 pub explicitly_linked: bool,
223e47cc
LB
1232}
1233
1a4d82fc 1234pub fn get_crate_deps(data: &[u8]) -> Vec<CrateDep> {
1a4d82fc 1235 let cratedoc = rbml::Doc::new(data);
223e47cc 1236 let depsdoc = reader::get_doc(cratedoc, tag_crate_deps);
62682a34 1237
c34b1796 1238 fn docstr(doc: rbml::Doc, tag_: usize) -> String {
970d7e83 1239 let d = reader::get_doc(doc, tag_);
1a4d82fc 1240 d.as_str_slice().to_string()
223e47cc 1241 }
62682a34
SL
1242
1243 reader::tagged_docs(depsdoc, tag_crate_dep).enumerate().map(|(crate_num, depdoc)| {
1a4d82fc 1244 let name = docstr(depdoc, tag_crate_dep_crate_name);
54a0048b 1245 let hash = Svh::new(docstr(depdoc, tag_crate_dep_hash));
e9174d1e
SL
1246 let doc = reader::get_doc(depdoc, tag_crate_dep_explicitly_linked);
1247 let explicitly_linked = reader::doc_as_u8(doc) != 0;
62682a34
SL
1248 CrateDep {
1249 cnum: crate_num as u32 + 1,
1a4d82fc
JJ
1250 name: name,
1251 hash: hash,
e9174d1e 1252 explicitly_linked: explicitly_linked,
62682a34
SL
1253 }
1254 }).collect()
223e47cc
LB
1255}
1256
c34b1796 1257fn list_crate_deps(data: &[u8], out: &mut io::Write) -> io::Result<()> {
54a0048b 1258 write!(out, "=External Dependencies=\n")?;
85aaf69f 1259 for dep in &get_crate_deps(data) {
54a0048b 1260 write!(out, "{} {}-{}\n", dep.cnum, dep.name, dep.hash)?;
223e47cc 1261 }
54a0048b 1262 write!(out, "\n")?;
1a4d82fc
JJ
1263 Ok(())
1264}
223e47cc 1265
1a4d82fc
JJ
1266pub fn maybe_get_crate_hash(data: &[u8]) -> Option<Svh> {
1267 let cratedoc = rbml::Doc::new(data);
1268 reader::maybe_get_doc(cratedoc, tag_crate_hash).map(|doc| {
54a0048b 1269 Svh::new(doc.as_str_slice().to_string())
1a4d82fc 1270 })
223e47cc
LB
1271}
1272
1a4d82fc
JJ
1273pub fn get_crate_hash(data: &[u8]) -> Svh {
1274 let cratedoc = rbml::Doc::new(data);
223e47cc 1275 let hashdoc = reader::get_doc(cratedoc, tag_crate_hash);
54a0048b 1276 Svh::new(hashdoc.as_str_slice().to_string())
223e47cc
LB
1277}
1278
54a0048b 1279pub fn maybe_get_crate_name(data: &[u8]) -> Option<&str> {
1a4d82fc
JJ
1280 let cratedoc = rbml::Doc::new(data);
1281 reader::maybe_get_doc(cratedoc, tag_crate_crate_name).map(|doc| {
54a0048b 1282 doc.as_str_slice()
1a4d82fc
JJ
1283 })
1284}
223e47cc 1285
54a0048b
SL
1286pub fn get_crate_disambiguator<'a>(data: &'a [u8]) -> &'a str {
1287 let crate_doc = rbml::Doc::new(data);
1288 let disambiguator_doc = reader::get_doc(crate_doc, tag_crate_disambiguator);
1289 let slice: &'a str = disambiguator_doc.as_str_slice();
1290 slice
1291}
1292
1a4d82fc
JJ
1293pub fn get_crate_triple(data: &[u8]) -> Option<String> {
1294 let cratedoc = rbml::Doc::new(data);
1295 let triple_doc = reader::maybe_get_doc(cratedoc, tag_crate_triple);
1296 triple_doc.map(|s| s.as_str().to_string())
223e47cc
LB
1297}
1298
54a0048b 1299pub fn get_crate_name(data: &[u8]) -> &str {
1a4d82fc 1300 maybe_get_crate_name(data).expect("no crate name in crate")
223e47cc
LB
1301}
1302
c34b1796 1303pub fn list_crate_metadata(bytes: &[u8], out: &mut io::Write) -> io::Result<()> {
223e47cc 1304 let hash = get_crate_hash(bytes);
1a4d82fc 1305 let md = rbml::Doc::new(bytes);
54a0048b 1306 list_crate_attributes(md, &hash, out)?;
1a4d82fc 1307 list_crate_deps(bytes, out)
223e47cc
LB
1308}
1309
1310// Translates a def_id from an external crate to a def_id for the current
1311// compilation environment. We use this when trying to load types from
1312// external crates - if those types further refer to types in other crates
1313// then we must translate the crate number from that encoded in the external
1314// crate to the correct local crate number.
e9174d1e
SL
1315pub fn translate_def_id(cdata: Cmd, did: DefId) -> DefId {
1316 if did.is_local() {
b039eaaf 1317 return DefId { krate: cdata.cnum, index: did.index };
223e47cc
LB
1318 }
1319
e9174d1e 1320 match cdata.cnum_map.borrow().get(&did.krate) {
1a4d82fc 1321 Some(&n) => {
e9174d1e 1322 DefId {
1a4d82fc 1323 krate: n,
b039eaaf 1324 index: did.index,
1a4d82fc
JJ
1325 }
1326 }
54a0048b 1327 None => bug!("didn't find a crate in the cnum_map")
223e47cc
LB
1328 }
1329}
1330
d9579d0f
AL
1331// Translate a DefId from the current compilation environment to a DefId
1332// for an external crate.
e9174d1e 1333fn reverse_translate_def_id(cdata: Cmd, did: DefId) -> Option<DefId> {
d9579d0f 1334 if did.krate == cdata.cnum {
b039eaaf 1335 return Some(DefId { krate: LOCAL_CRATE, index: did.index });
d9579d0f
AL
1336 }
1337
e9174d1e 1338 for (&local, &global) in cdata.cnum_map.borrow().iter() {
d9579d0f 1339 if global == did.krate {
b039eaaf 1340 return Some(DefId { krate: local, index: did.index });
d9579d0f
AL
1341 }
1342 }
1343
1344 None
1a4d82fc
JJ
1345}
1346
9cc50fc6
SL
1347/// Translates a `Span` from an extern crate to the corresponding `Span`
1348/// within the local crate's codemap.
1349pub fn translate_span(cdata: Cmd,
1350 codemap: &codemap::CodeMap,
1351 last_filemap_index_hint: &Cell<usize>,
1352 span: codemap::Span)
1353 -> codemap::Span {
1354 let span = if span.lo > span.hi {
1355 // Currently macro expansion sometimes produces invalid Span values
1356 // where lo > hi. In order not to crash the compiler when trying to
1357 // translate these values, let's transform them into something we
1358 // can handle (and which will produce useful debug locations at
1359 // least some of the time).
1360 // This workaround is only necessary as long as macro expansion is
1361 // not fixed. FIXME(#23480)
1362 codemap::mk_sp(span.lo, span.lo)
1363 } else {
1364 span
1365 };
1366
1367 let imported_filemaps = cdata.imported_filemaps(&codemap);
1368 let filemap = {
1369 // Optimize for the case that most spans within a translated item
1370 // originate from the same filemap.
1371 let last_filemap_index = last_filemap_index_hint.get();
1372 let last_filemap = &imported_filemaps[last_filemap_index];
1373
1374 if span.lo >= last_filemap.original_start_pos &&
1375 span.lo <= last_filemap.original_end_pos &&
1376 span.hi >= last_filemap.original_start_pos &&
1377 span.hi <= last_filemap.original_end_pos {
1378 last_filemap
1379 } else {
1380 let mut a = 0;
1381 let mut b = imported_filemaps.len();
1382
1383 while b - a > 1 {
1384 let m = (a + b) / 2;
1385 if imported_filemaps[m].original_start_pos > span.lo {
1386 b = m;
1387 } else {
1388 a = m;
1389 }
1390 }
1391
1392 last_filemap_index_hint.set(a);
1393 &imported_filemaps[a]
1394 }
1395 };
1396
1397 let lo = (span.lo - filemap.original_start_pos) +
1398 filemap.translated_filemap.start_pos;
1399 let hi = (span.hi - filemap.original_start_pos) +
1400 filemap.translated_filemap.start_pos;
1401
1402 codemap::mk_sp(lo, hi)
1403}
1404
d9579d0f 1405pub fn each_inherent_implementation_for_type<F>(cdata: Cmd,
b039eaaf 1406 id: DefIndex,
d9579d0f 1407 mut callback: F)
e9174d1e 1408 where F: FnMut(DefId),
1a4d82fc 1409{
e9174d1e 1410 let item_doc = cdata.lookup_item(id);
62682a34 1411 for impl_doc in reader::tagged_docs(item_doc, tag_items_data_item_inherent_impl) {
d9579d0f
AL
1412 if reader::maybe_get_doc(impl_doc, tag_item_trait_ref).is_none() {
1413 callback(item_def_id(impl_doc, cdata));
1414 }
62682a34 1415 }
1a4d82fc
JJ
1416}
1417
1418pub fn each_implementation_for_trait<F>(cdata: Cmd,
e9174d1e 1419 def_id: DefId,
1a4d82fc 1420 mut callback: F) where
e9174d1e 1421 F: FnMut(DefId),
1a4d82fc 1422{
d9579d0f
AL
1423 // Do a reverse lookup beforehand to avoid touching the crate_num
1424 // hash map in the loop below.
1425 if let Some(crate_local_did) = reverse_translate_def_id(cdata, def_id) {
1426 let def_id_u64 = def_to_u64(crate_local_did);
1427
1428 let impls_doc = reader::get_doc(rbml::Doc::new(cdata.data()), tag_impls);
b039eaaf
SL
1429 for trait_doc in reader::tagged_docs(impls_doc, tag_impls_trait) {
1430 let trait_def_id = reader::get_doc(trait_doc, tag_def_id);
1431 if reader::doc_as_u64(trait_def_id) != def_id_u64 {
1432 continue;
1433 }
1434 for impl_doc in reader::tagged_docs(trait_doc, tag_impls_trait_impl) {
1435 callback(translated_def_id(cdata, impl_doc));
d9579d0f 1436 }
62682a34 1437 }
d9579d0f 1438 }
1a4d82fc
JJ
1439}
1440
54a0048b 1441pub fn get_trait_of_item(cdata: Cmd, id: DefIndex, tcx: &TyCtxt)
e9174d1e
SL
1442 -> Option<DefId> {
1443 let item_doc = cdata.lookup_item(id);
d9579d0f 1444 let parent_item_id = match item_parent_item(cdata, item_doc) {
1a4d82fc
JJ
1445 None => return None,
1446 Some(item_id) => item_id,
1447 };
b039eaaf 1448 let parent_item_doc = cdata.lookup_item(parent_item_id.index);
1a4d82fc
JJ
1449 match item_family(parent_item_doc) {
1450 Trait => Some(item_def_id(parent_item_doc, cdata)),
c34b1796 1451 Impl | DefaultImpl => {
1a4d82fc
JJ
1452 reader::maybe_get_doc(parent_item_doc, tag_item_trait_ref)
1453 .map(|_| item_trait_ref(parent_item_doc, tcx, cdata).def_id)
1454 }
1455 _ => None
1456 }
1457}
1458
1459
1460pub fn get_native_libraries(cdata: Cmd)
1461 -> Vec<(cstore::NativeLibraryKind, String)> {
1462 let libraries = reader::get_doc(rbml::Doc::new(cdata.data()),
1463 tag_native_libraries);
62682a34 1464 reader::tagged_docs(libraries, tag_native_libraries_lib).map(|lib_doc| {
1a4d82fc
JJ
1465 let kind_doc = reader::get_doc(lib_doc, tag_native_libraries_kind);
1466 let name_doc = reader::get_doc(lib_doc, tag_native_libraries_name);
1467 let kind: cstore::NativeLibraryKind =
9346a6ac 1468 cstore::NativeLibraryKind::from_u32(reader::doc_as_u32(kind_doc)).unwrap();
1a4d82fc 1469 let name = name_doc.as_str().to_string();
62682a34
SL
1470 (kind, name)
1471 }).collect()
1a4d82fc
JJ
1472}
1473
b039eaaf 1474pub fn get_plugin_registrar_fn(data: &[u8]) -> Option<DefIndex> {
1a4d82fc 1475 reader::maybe_get_doc(rbml::Doc::new(data), tag_plugin_registrar_fn)
b039eaaf 1476 .map(|doc| DefIndex::from_u32(reader::doc_as_u32(doc)))
1a4d82fc
JJ
1477}
1478
1479pub fn each_exported_macro<F>(data: &[u8], intr: &IdentInterner, mut f: F) where
7453a54e 1480 F: FnMut(ast::Name, Vec<ast::Attribute>, Span, String) -> bool,
1a4d82fc
JJ
1481{
1482 let macros = reader::get_doc(rbml::Doc::new(data), tag_macro_defs);
62682a34 1483 for macro_doc in reader::tagged_docs(macros, tag_macro_def) {
1a4d82fc
JJ
1484 let name = item_name(intr, macro_doc);
1485 let attrs = get_attributes(macro_doc);
7453a54e 1486 let span = get_macro_span(macro_doc);
1a4d82fc 1487 let body = reader::get_doc(macro_doc, tag_macro_def_body);
7453a54e 1488 if !f(name, attrs, span, body.as_str().to_string()) {
62682a34
SL
1489 break;
1490 }
1491 }
1a4d82fc
JJ
1492}
1493
7453a54e
SL
1494pub fn get_macro_span(doc: rbml::Doc) -> Span {
1495 let lo_doc = reader::get_doc(doc, tag_macro_def_span_lo);
1496 let lo = BytePos(reader::doc_as_u32(lo_doc));
1497 let hi_doc = reader::get_doc(doc, tag_macro_def_span_hi);
1498 let hi = BytePos(reader::doc_as_u32(hi_doc));
1499 return Span { lo: lo, hi: hi, expn_id: NO_EXPANSION };
1500}
1501
1a4d82fc 1502pub fn get_dylib_dependency_formats(cdata: Cmd)
92a42be0 1503 -> Vec<(ast::CrateNum, LinkagePreference)>
1a4d82fc
JJ
1504{
1505 let formats = reader::get_doc(rbml::Doc::new(cdata.data()),
1506 tag_dylib_dependency_formats);
1507 let mut result = Vec::new();
1508
1509 debug!("found dylib deps: {}", formats.as_str_slice());
1510 for spec in formats.as_str_slice().split(',') {
9346a6ac 1511 if spec.is_empty() { continue }
1a4d82fc
JJ
1512 let cnum = spec.split(':').nth(0).unwrap();
1513 let link = spec.split(':').nth(1).unwrap();
1514 let cnum: ast::CrateNum = cnum.parse().unwrap();
e9174d1e 1515 let cnum = match cdata.cnum_map.borrow().get(&cnum) {
1a4d82fc 1516 Some(&n) => n,
54a0048b 1517 None => bug!("didn't find a crate in the cnum_map")
1a4d82fc
JJ
1518 };
1519 result.push((cnum, if link == "d" {
92a42be0 1520 LinkagePreference::RequireDynamic
1a4d82fc 1521 } else {
92a42be0 1522 LinkagePreference::RequireStatic
1a4d82fc
JJ
1523 }));
1524 }
1525 return result;
1526}
1527
1528pub fn get_missing_lang_items(cdata: Cmd)
1529 -> Vec<lang_items::LangItem>
1530{
1531 let items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_lang_items);
62682a34
SL
1532 reader::tagged_docs(items, tag_lang_items_missing).map(|missing_docs| {
1533 lang_items::LangItem::from_u32(reader::doc_as_u32(missing_docs)).unwrap()
1534 }).collect()
1a4d82fc
JJ
1535}
1536
b039eaaf 1537pub fn get_method_arg_names(cdata: Cmd, id: DefIndex) -> Vec<String> {
e9174d1e 1538 let method_doc = cdata.lookup_item(id);
1a4d82fc
JJ
1539 match reader::maybe_get_doc(method_doc, tag_method_argument_names) {
1540 Some(args_doc) => {
62682a34
SL
1541 reader::tagged_docs(args_doc, tag_method_argument_name).map(|name_doc| {
1542 name_doc.as_str_slice().to_string()
1543 }).collect()
1544 },
1545 None => vec![],
1a4d82fc 1546 }
1a4d82fc
JJ
1547}
1548
e9174d1e 1549pub fn get_reachable_ids(cdata: Cmd) -> Vec<DefId> {
1a4d82fc 1550 let items = reader::get_doc(rbml::Doc::new(cdata.data()),
e9174d1e
SL
1551 tag_reachable_ids);
1552 reader::tagged_docs(items, tag_reachable_id).map(|doc| {
1553 DefId {
1a4d82fc 1554 krate: cdata.cnum,
b039eaaf 1555 index: DefIndex::from_u32(reader::doc_as_u32(doc)),
62682a34
SL
1556 }
1557 }).collect()
1a4d82fc
JJ
1558}
1559
b039eaaf 1560pub fn is_typedef(cdata: Cmd, id: DefIndex) -> bool {
e9174d1e 1561 let item_doc = cdata.lookup_item(id);
1a4d82fc
JJ
1562 match item_family(item_doc) {
1563 Type => true,
1564 _ => false,
1565 }
1566}
1567
b039eaaf 1568pub fn is_const_fn(cdata: Cmd, id: DefIndex) -> bool {
e9174d1e 1569 let item_doc = cdata.lookup_item(id);
62682a34 1570 match fn_constness(item_doc) {
e9174d1e
SL
1571 hir::Constness::Const => true,
1572 hir::Constness::NotConst => false,
62682a34
SL
1573 }
1574}
1575
54a0048b 1576pub fn is_extern_item(cdata: Cmd, id: DefIndex, tcx: &TyCtxt) -> bool {
7453a54e
SL
1577 let item_doc = match cdata.get_item(id) {
1578 Some(doc) => doc,
1579 None => return false,
1580 };
1581 let applicable = match item_family(item_doc) {
92a42be0 1582 ImmStatic | MutStatic => true,
7453a54e
SL
1583 Fn => {
1584 let ty::TypeScheme { generics, ty } = get_type(cdata, id, tcx);
1585 let no_generics = generics.types.is_empty();
1586 match ty.sty {
54a0048b
SL
1587 ty::TyFnDef(_, _, fn_ty) | ty::TyFnPtr(fn_ty)
1588 if fn_ty.abi != Abi::Rust => return no_generics,
7453a54e
SL
1589 _ => no_generics,
1590 }
1591 },
92a42be0 1592 _ => false,
7453a54e
SL
1593 };
1594
1595 if applicable {
1596 attr::contains_extern_indicator(tcx.sess.diagnostic(),
1597 &get_attributes(item_doc))
1598 } else {
1599 false
92a42be0
SL
1600 }
1601}
1602
b039eaaf 1603pub fn is_impl(cdata: Cmd, id: DefIndex) -> bool {
e9174d1e 1604 let item_doc = cdata.lookup_item(id);
62682a34
SL
1605 match item_family(item_doc) {
1606 Impl => true,
1607 _ => false,
1608 }
1609}
1610
1a4d82fc 1611fn doc_generics<'tcx>(base_doc: rbml::Doc,
54a0048b 1612 tcx: &TyCtxt<'tcx>,
1a4d82fc 1613 cdata: Cmd,
c34b1796 1614 tag: usize)
1a4d82fc
JJ
1615 -> ty::Generics<'tcx>
1616{
1617 let doc = reader::get_doc(base_doc, tag);
1618
1619 let mut types = subst::VecPerParamSpace::empty();
62682a34 1620 for p in reader::tagged_docs(doc, tag_type_param_def) {
e9174d1e
SL
1621 let bd =
1622 TyDecoder::with_doc(tcx, cdata.cnum, p,
b039eaaf 1623 &mut |did| translate_def_id(cdata, did))
e9174d1e 1624 .parse_type_param_def();
1a4d82fc 1625 types.push(bd.space, bd);
62682a34 1626 }
1a4d82fc
JJ
1627
1628 let mut regions = subst::VecPerParamSpace::empty();
62682a34 1629 for rp_doc in reader::tagged_docs(doc, tag_region_param_def) {
1a4d82fc
JJ
1630 let ident_str_doc = reader::get_doc(rp_doc,
1631 tag_region_param_def_ident);
7453a54e 1632 let name = item_name(&token::get_ident_interner(), ident_str_doc);
1a4d82fc
JJ
1633 let def_id_doc = reader::get_doc(rp_doc,
1634 tag_region_param_def_def_id);
d9579d0f 1635 let def_id = translated_def_id(cdata, def_id_doc);
1a4d82fc
JJ
1636
1637 let doc = reader::get_doc(rp_doc, tag_region_param_def_space);
c34b1796 1638 let space = subst::ParamSpace::from_uint(reader::doc_as_u64(doc) as usize);
1a4d82fc
JJ
1639
1640 let doc = reader::get_doc(rp_doc, tag_region_param_def_index);
1641 let index = reader::doc_as_u64(doc) as u32;
1642
62682a34 1643 let bounds = reader::tagged_docs(rp_doc, tag_items_data_region).map(|p| {
e9174d1e 1644 TyDecoder::with_doc(tcx, cdata.cnum, p,
b039eaaf 1645 &mut |did| translate_def_id(cdata, did))
e9174d1e 1646 .parse_region()
62682a34 1647 }).collect();
1a4d82fc
JJ
1648
1649 regions.push(space, ty::RegionParameterDef { name: name,
1650 def_id: def_id,
1651 space: space,
1652 index: index,
1653 bounds: bounds });
62682a34 1654 }
1a4d82fc 1655
85aaf69f
SL
1656 ty::Generics { types: types, regions: regions }
1657}
1658
b039eaaf
SL
1659fn doc_predicate<'tcx>(cdata: Cmd,
1660 doc: rbml::Doc,
54a0048b 1661 tcx: &TyCtxt<'tcx>)
b039eaaf
SL
1662 -> ty::Predicate<'tcx>
1663{
1664 let predicate_pos = cdata.xref_index.lookup(
1665 cdata.data(), reader::doc_as_u32(doc)).unwrap() as usize;
1666 TyDecoder::new(
1667 cdata.data(), cdata.cnum, predicate_pos, tcx,
1668 &mut |did| translate_def_id(cdata, did)
1669 ).parse_predicate()
1670}
1671
85aaf69f 1672fn doc_predicates<'tcx>(base_doc: rbml::Doc,
54a0048b 1673 tcx: &TyCtxt<'tcx>,
85aaf69f 1674 cdata: Cmd,
c34b1796 1675 tag: usize)
85aaf69f
SL
1676 -> ty::GenericPredicates<'tcx>
1677{
1678 let doc = reader::get_doc(base_doc, tag);
1679
1a4d82fc 1680 let mut predicates = subst::VecPerParamSpace::empty();
b039eaaf
SL
1681 for predicate_doc in reader::tagged_docs(doc, tag_type_predicate) {
1682 predicates.push(subst::TypeSpace,
1683 doc_predicate(cdata, predicate_doc, tcx));
1684 }
1685 for predicate_doc in reader::tagged_docs(doc, tag_self_predicate) {
1686 predicates.push(subst::SelfSpace,
1687 doc_predicate(cdata, predicate_doc, tcx));
1688 }
1689 for predicate_doc in reader::tagged_docs(doc, tag_fn_predicate) {
1690 predicates.push(subst::FnSpace,
1691 doc_predicate(cdata, predicate_doc, tcx));
62682a34 1692 }
1a4d82fc 1693
85aaf69f 1694 ty::GenericPredicates { predicates: predicates }
1a4d82fc
JJ
1695}
1696
b039eaaf 1697pub fn is_defaulted_trait(cdata: Cmd, trait_id: DefIndex) -> bool {
e9174d1e 1698 let trait_doc = cdata.lookup_item(trait_id);
c34b1796
AL
1699 assert!(item_family(trait_doc) == Family::Trait);
1700 let defaulted_doc = reader::get_doc(trait_doc, tag_defaulted_trait);
1701 reader::doc_as_u8(defaulted_doc) != 0
1702}
1703
b039eaaf 1704pub fn is_default_impl(cdata: Cmd, impl_id: DefIndex) -> bool {
e9174d1e 1705 let impl_doc = cdata.lookup_item(impl_id);
c34b1796
AL
1706 item_family(impl_doc) == Family::DefaultImpl
1707}
1708
1709pub fn get_imported_filemaps(metadata: &[u8]) -> Vec<codemap::FileMap> {
1710 let crate_doc = rbml::Doc::new(metadata);
1711 let cm_doc = reader::get_doc(crate_doc, tag_codemap);
1712
62682a34 1713 reader::tagged_docs(cm_doc, tag_codemap_filemap).map(|filemap_doc| {
c34b1796 1714 let mut decoder = reader::Decoder::new(filemap_doc);
9cc50fc6
SL
1715 decoder.read_opaque(|opaque_decoder, _| {
1716 Decodable::decode(opaque_decoder)
1717 }).unwrap()
62682a34 1718 }).collect()
c34b1796 1719}
e9174d1e 1720
b039eaaf
SL
1721pub fn closure_kind(cdata: Cmd, closure_id: DefIndex) -> ty::ClosureKind {
1722 let closure_doc = cdata.lookup_item(closure_id);
1723 let closure_kind_doc = reader::get_doc(closure_doc, tag_items_closure_kind);
1724 let mut decoder = reader::Decoder::new(closure_kind_doc);
1725 ty::ClosureKind::decode(&mut decoder).unwrap()
1726}
1727
54a0048b 1728pub fn closure_ty<'tcx>(cdata: Cmd, closure_id: DefIndex, tcx: &TyCtxt<'tcx>)
b039eaaf
SL
1729 -> ty::ClosureTy<'tcx> {
1730 let closure_doc = cdata.lookup_item(closure_id);
1731 let closure_ty_doc = reader::get_doc(closure_doc, tag_items_closure_ty);
1732 TyDecoder::with_doc(tcx, cdata.cnum, closure_ty_doc, &mut |did| translate_def_id(cdata, did))
1733 .parse_closure_ty()
1734}
1735
54a0048b
SL
1736pub fn def_key(cdata: Cmd, id: DefIndex) -> hir_map::DefKey {
1737 debug!("def_key: id={:?}", id);
1738 let item_doc = cdata.lookup_item(id);
b039eaaf
SL
1739 match reader::maybe_get_doc(item_doc, tag_def_key) {
1740 Some(def_key_doc) => {
1741 let mut decoder = reader::Decoder::new(def_key_doc);
1742 hir_map::DefKey::decode(&mut decoder).unwrap()
1743 }
1744 None => {
54a0048b 1745 bug!("failed to find block with tag {:?} for item with family {:?}",
b039eaaf
SL
1746 tag_def_key,
1747 item_family(item_doc))
1748 }
1749 }
1750}
1751
1752pub fn def_path(cdata: Cmd, id: DefIndex) -> hir_map::DefPath {
1753 debug!("def_path(id={:?})", id);
54a0048b 1754 hir_map::DefPath::make(cdata.cnum, id, |parent| def_key(cdata, parent))
b039eaaf 1755}