1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
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.
11 #![allow(non_camel_case_types)]
12 // FIXME: remove this after snapshot, and Results are handled
13 #![allow(unused_must_use)]
15 use front::map as ast_map;
17 use rustc_front::fold;
18 use rustc_front::fold::Folder;
20 use metadata::common as c;
21 use metadata::cstore as cstore;
23 use metadata::decoder;
24 use metadata::encoder as e;
25 use metadata::inline::{InlinedItem, InlinedItemRef};
26 use metadata::tydecode;
27 use metadata::tyencode;
28 use middle::ty::adjustment;
30 use middle::check_const::ConstQualif;
32 use middle::def_id::DefId;
33 use middle::privacy::{AllPublic, LastMod};
36 use middle::ty::{self, Ty};
38 use syntax::{ast, ast_util, codemap};
39 use syntax::ast::NodeIdAssigner;
40 use syntax::codemap::Span;
44 use std::io::SeekFrom;
45 use std::io::prelude::*;
49 use rbml::writer::Encoder;
52 use serialize::{Decodable, Decoder, DecoderHelpers, Encodable};
53 use serialize::EncoderHelpers;
55 #[cfg(test)] use std::io::Cursor;
56 #[cfg(test)] use syntax::parse;
57 #[cfg(test)] use syntax::ast::NodeId;
58 #[cfg(test)] use rustc_front::print::pprust;
59 #[cfg(test)] use rustc_front::lowering::{lower_item, LoweringContext};
61 struct DecodeContext<'a, 'b, 'tcx: 'a> {
62 tcx: &'a ty::ctxt<'tcx>,
63 cdata: &'b cstore::crate_metadata,
64 from_id_range: ast_util::IdRange,
65 to_id_range: ast_util::IdRange,
66 // Cache the last used filemap for translating spans as an optimization.
67 last_filemap_index: Cell<usize>,
71 fn tr(&self, dcx: &DecodeContext) -> Self;
74 // ______________________________________________________________________
77 pub fn encode_inlined_item(ecx: &e::EncodeContext,
81 InlinedItemRef::Item(i) => i.id,
82 InlinedItemRef::Foreign(i) => i.id,
83 InlinedItemRef::TraitItem(_, ti) => ti.id,
84 InlinedItemRef::ImplItem(_, ii) => ii.id,
86 debug!("> Encoding inlined item: {} ({:?})",
87 ecx.tcx.map.path_to_string(id),
88 rbml_w.writer.seek(SeekFrom::Current(0)));
90 // Folding could be avoided with a smarter encoder.
91 let ii = simplify_ast(ii);
92 let id_range = ii.compute_id_range();
94 rbml_w.start_tag(c::tag_ast as usize);
95 id_range.encode(rbml_w);
96 encode_ast(rbml_w, &ii);
97 encode_side_tables_for_ii(ecx, rbml_w, &ii);
100 debug!("< Encoded inlined fn: {} ({:?})",
101 ecx.tcx.map.path_to_string(id),
102 rbml_w.writer.seek(SeekFrom::Current(0)));
105 impl<'a, 'b, 'c, 'tcx> ast_map::FoldOps for &'a DecodeContext<'b, 'c, 'tcx> {
106 fn new_id(&self, id: ast::NodeId) -> ast::NodeId {
107 if id == ast::DUMMY_NODE_ID {
108 // Used by ast_map to map the NodeInlinedParent.
109 self.tcx.sess.next_node_id()
114 fn new_def_id(&self, def_id: DefId) -> DefId {
115 self.tr_def_id(def_id)
117 fn new_span(&self, span: Span) -> Span {
122 /// Decodes an item from its AST in the cdata's metadata and adds it to the
124 pub fn decode_inlined_item<'tcx>(cdata: &cstore::crate_metadata,
125 tcx: &ty::ctxt<'tcx>,
126 path: Vec<ast_map::PathElem>,
127 def_path: ast_map::DefPath,
130 -> Result<&'tcx InlinedItem, (Vec<ast_map::PathElem>,
132 match par_doc.opt_child(c::tag_ast) {
133 None => Err((path, def_path)),
135 let mut path_as_str = None;
136 debug!("> Decoding inlined fn: {:?}::?",
138 // Do an Option dance to use the path after it is moved below.
139 let s = ast_map::path_to_string(path.iter().cloned());
140 path_as_str = Some(s);
141 path_as_str.as_ref().map(|x| &x[..])
143 let mut ast_dsr = reader::Decoder::new(ast_doc);
144 let from_id_range = Decodable::decode(&mut ast_dsr).unwrap();
145 let to_id_range = reserve_id_range(&tcx.sess, from_id_range);
146 let dcx = &DecodeContext {
149 from_id_range: from_id_range,
150 to_id_range: to_id_range,
151 last_filemap_index: Cell::new(0)
153 let raw_ii = decode_ast(ast_doc);
154 let ii = ast_map::map_decoded_item(&dcx.tcx.map, path, def_path, raw_ii, dcx);
156 let name = match *ii {
157 InlinedItem::Item(ref i) => i.name,
158 InlinedItem::Foreign(ref i) => i.name,
159 InlinedItem::TraitItem(_, ref ti) => ti.name,
160 InlinedItem::ImplItem(_, ref ii) => ii.name
162 debug!("Fn named: {}", name);
163 debug!("< Decoded inlined fn: {}::{}",
164 path_as_str.unwrap(),
166 region::resolve_inlined_item(&tcx.sess, &tcx.region_maps, ii);
167 decode_side_tables(dcx, ast_doc);
168 copy_item_types(dcx, ii, orig_did);
170 InlinedItem::Item(ref i) => {
171 debug!(">>> DECODED ITEM >>>\n{}\n<<< DECODED ITEM <<<",
172 ::rustc_front::print::pprust::item_to_string(&**i));
181 // ______________________________________________________________________
182 // Enumerating the IDs which appear in an AST
184 fn reserve_id_range(sess: &Session,
185 from_id_range: ast_util::IdRange) -> ast_util::IdRange {
186 // Handle the case of an empty range:
187 if from_id_range.empty() { return from_id_range; }
188 let cnt = from_id_range.max - from_id_range.min;
189 let to_id_min = sess.reserve_node_ids(cnt);
190 let to_id_max = to_id_min + cnt;
191 ast_util::IdRange { min: to_id_min, max: to_id_max }
194 impl<'a, 'b, 'tcx> DecodeContext<'a, 'b, 'tcx> {
195 /// Translates an internal id, meaning a node id that is known to refer to some part of the
196 /// item currently being inlined, such as a local variable or argument. All naked node-ids
197 /// that appear in types have this property, since if something might refer to an external item
198 /// we would use a def-id to allow for the possibility that the item resides in another crate.
199 pub fn tr_id(&self, id: ast::NodeId) -> ast::NodeId {
200 // from_id_range should be non-empty
201 assert!(!self.from_id_range.empty());
202 // Use wrapping arithmetic because otherwise it introduces control flow.
203 // Maybe we should just have the control flow? -- aatch
204 (id.wrapping_sub(self.from_id_range.min).wrapping_add(self.to_id_range.min))
207 /// Translates an EXTERNAL def-id, converting the crate number from the one used in the encoded
208 /// data to the current crate numbers.. By external, I mean that it be translated to a
209 /// reference to the item in its original crate, as opposed to being translated to a reference
210 /// to the inlined version of the item. This is typically, but not always, what you want,
211 /// because most def-ids refer to external things like types or other fns that may or may not
212 /// be inlined. Note that even when the inlined function is referencing itself recursively, we
213 /// would want `tr_def_id` for that reference--- conceptually the function calls the original,
214 /// non-inlined version, and trans deals with linking that recursive call to the inlined copy.
215 pub fn tr_def_id(&self, did: DefId) -> DefId {
216 decoder::translate_def_id(self.cdata, did)
219 /// Translates a `Span` from an extern crate to the corresponding `Span`
220 /// within the local crate's codemap. `creader::import_codemap()` will
221 /// already have allocated any additionally needed FileMaps in the local
222 /// codemap as a side-effect of creating the crate_metadata's
223 /// `codemap_import_info`.
224 pub fn tr_span(&self, span: Span) -> Span {
225 let span = if span.lo > span.hi {
226 // Currently macro expansion sometimes produces invalid Span values
227 // where lo > hi. In order not to crash the compiler when trying to
228 // translate these values, let's transform them into something we
229 // can handle (and which will produce useful debug locations at
230 // least some of the time).
231 // This workaround is only necessary as long as macro expansion is
232 // not fixed. FIXME(#23480)
233 codemap::mk_sp(span.lo, span.lo)
238 let imported_filemaps = self.cdata.imported_filemaps(self.tcx.sess.codemap());
240 // Optimize for the case that most spans within a translated item
241 // originate from the same filemap.
242 let last_filemap_index = self.last_filemap_index.get();
243 let last_filemap = &imported_filemaps[last_filemap_index];
245 if span.lo >= last_filemap.original_start_pos &&
246 span.lo <= last_filemap.original_end_pos &&
247 span.hi >= last_filemap.original_start_pos &&
248 span.hi <= last_filemap.original_end_pos {
252 let mut b = imported_filemaps.len();
256 if imported_filemaps[m].original_start_pos > span.lo {
263 self.last_filemap_index.set(a);
264 &imported_filemaps[a]
268 let lo = (span.lo - filemap.original_start_pos) +
269 filemap.translated_filemap.start_pos;
270 let hi = (span.hi - filemap.original_start_pos) +
271 filemap.translated_filemap.start_pos;
273 codemap::mk_sp(lo, hi)
278 fn tr(&self, dcx: &DecodeContext) -> DefId {
283 impl tr for Option<DefId> {
284 fn tr(&self, dcx: &DecodeContext) -> Option<DefId> {
285 self.map(|d| dcx.tr_def_id(d))
290 fn tr(&self, dcx: &DecodeContext) -> Span {
295 trait def_id_encoder_helpers {
296 fn emit_def_id(&mut self, did: DefId);
299 impl<S:serialize::Encoder> def_id_encoder_helpers for S
300 where <S as serialize::serialize::Encoder>::Error: Debug
302 fn emit_def_id(&mut self, did: DefId) {
303 did.encode(self).unwrap()
307 trait def_id_decoder_helpers {
308 fn read_def_id(&mut self, dcx: &DecodeContext) -> DefId;
309 fn read_def_id_nodcx(&mut self,
310 cdata: &cstore::crate_metadata) -> DefId;
313 impl<D:serialize::Decoder> def_id_decoder_helpers for D
314 where <D as serialize::serialize::Decoder>::Error: Debug
316 fn read_def_id(&mut self, dcx: &DecodeContext) -> DefId {
317 let did: DefId = Decodable::decode(self).unwrap();
321 fn read_def_id_nodcx(&mut self,
322 cdata: &cstore::crate_metadata)
324 let did: DefId = Decodable::decode(self).unwrap();
325 decoder::translate_def_id(cdata, did)
329 // ______________________________________________________________________
330 // Encoding and decoding the AST itself
332 // When decoding, we have to renumber the AST so that the node ids that
333 // appear within are disjoint from the node ids in our existing ASTs.
334 // We also have to adjust the spans: for now we just insert a dummy span,
335 // but eventually we should add entries to the local codemap as required.
337 fn encode_ast(rbml_w: &mut Encoder, item: &InlinedItem) {
338 rbml_w.start_tag(c::tag_tree as usize);
343 struct NestedItemsDropper;
345 impl Folder for NestedItemsDropper {
346 fn fold_block(&mut self, blk: P<hir::Block>) -> P<hir::Block> {
347 blk.and_then(|hir::Block {id, stmts, expr, rules, span, ..}| {
348 let stmts_sans_items = stmts.into_iter().filter_map(|stmt| {
349 let use_stmt = match stmt.node {
350 hir::StmtExpr(_, _) | hir::StmtSemi(_, _) => true,
351 hir::StmtDecl(ref decl, _) => {
353 hir::DeclLocal(_) => true,
354 hir::DeclItem(_) => false,
364 let blk_sans_items = P(hir::Block {
365 stmts: stmts_sans_items,
371 fold::noop_fold_block(blk_sans_items, self)
376 // Produces a simplified copy of the AST which does not include things
377 // that we do not need to or do not want to export. For example, we
378 // do not include any nested items: if these nested items are to be
379 // inlined, their AST will be exported separately (this only makes
380 // sense because, in Rust, nested items are independent except for
381 // their visibility).
383 // As it happens, trans relies on the fact that we do not export
384 // nested items, as otherwise it would get confused when translating
386 fn simplify_ast(ii: InlinedItemRef) -> InlinedItem {
387 let mut fld = NestedItemsDropper;
390 // HACK we're not dropping items.
391 InlinedItemRef::Item(i) => {
392 InlinedItem::Item(fold::noop_fold_item(P(i.clone()), &mut fld))
394 InlinedItemRef::TraitItem(d, ti) => {
395 InlinedItem::TraitItem(d, fold::noop_fold_trait_item(P(ti.clone()), &mut fld))
397 InlinedItemRef::ImplItem(d, ii) => {
398 InlinedItem::ImplItem(d, fold::noop_fold_impl_item(P(ii.clone()), &mut fld))
400 InlinedItemRef::Foreign(i) => {
401 InlinedItem::Foreign(fold::noop_fold_foreign_item(P(i.clone()), &mut fld))
406 fn decode_ast(par_doc: rbml::Doc) -> InlinedItem {
407 let chi_doc = par_doc.get(c::tag_tree as usize);
408 let mut d = reader::Decoder::new(chi_doc);
409 Decodable::decode(&mut d).unwrap()
412 // ______________________________________________________________________
413 // Encoding and decoding of ast::def
415 fn decode_def(dcx: &DecodeContext, dsr: &mut reader::Decoder) -> def::Def {
416 let def: def::Def = Decodable::decode(dsr).unwrap();
420 impl tr for def::Def {
421 fn tr(&self, dcx: &DecodeContext) -> def::Def {
423 def::DefFn(did, is_ctor) => def::DefFn(did.tr(dcx), is_ctor),
424 def::DefMethod(did) => def::DefMethod(did.tr(dcx)),
425 def::DefSelfTy(opt_did, impl_ids) => { def::DefSelfTy(opt_did.map(|did| did.tr(dcx)),
426 impl_ids.map(|(nid1, nid2)| {
430 def::DefMod(did) => { def::DefMod(did.tr(dcx)) }
431 def::DefForeignMod(did) => { def::DefForeignMod(did.tr(dcx)) }
432 def::DefStatic(did, m) => { def::DefStatic(did.tr(dcx), m) }
433 def::DefConst(did) => { def::DefConst(did.tr(dcx)) }
434 def::DefAssociatedConst(did) => def::DefAssociatedConst(did.tr(dcx)),
435 def::DefLocal(_, nid) => {
436 let nid = dcx.tr_id(nid);
437 let did = dcx.tcx.map.local_def_id(nid);
438 def::DefLocal(did, nid)
440 def::DefVariant(e_did, v_did, is_s) => {
441 def::DefVariant(e_did.tr(dcx), v_did.tr(dcx), is_s)
443 def::DefTrait(did) => def::DefTrait(did.tr(dcx)),
444 def::DefTy(did, is_enum) => def::DefTy(did.tr(dcx), is_enum),
445 def::DefAssociatedTy(trait_did, did) =>
446 def::DefAssociatedTy(trait_did.tr(dcx), did.tr(dcx)),
447 def::DefPrimTy(p) => def::DefPrimTy(p),
448 def::DefTyParam(s, index, def_id, n) => def::DefTyParam(s, index, def_id.tr(dcx), n),
449 def::DefUse(did) => def::DefUse(did.tr(dcx)),
450 def::DefUpvar(_, nid1, index, nid2) => {
451 let nid1 = dcx.tr_id(nid1);
452 let nid2 = dcx.tr_id(nid2);
453 let did1 = dcx.tcx.map.local_def_id(nid1);
454 def::DefUpvar(did1, nid1, index, nid2)
456 def::DefStruct(did) => def::DefStruct(did.tr(dcx)),
457 def::DefLabel(nid) => def::DefLabel(dcx.tr_id(nid))
462 // ______________________________________________________________________
463 // Encoding and decoding of freevar information
465 fn encode_freevar_entry(rbml_w: &mut Encoder, fv: &ty::Freevar) {
466 (*fv).encode(rbml_w).unwrap();
469 trait rbml_decoder_helper {
470 fn read_freevar_entry(&mut self, dcx: &DecodeContext)
472 fn read_capture_mode(&mut self) -> hir::CaptureClause;
475 impl<'a> rbml_decoder_helper for reader::Decoder<'a> {
476 fn read_freevar_entry(&mut self, dcx: &DecodeContext)
478 let fv: ty::Freevar = Decodable::decode(self).unwrap();
482 fn read_capture_mode(&mut self) -> hir::CaptureClause {
483 let cm: hir::CaptureClause = Decodable::decode(self).unwrap();
488 impl tr for ty::Freevar {
489 fn tr(&self, dcx: &DecodeContext) -> ty::Freevar {
491 def: self.def.tr(dcx),
492 span: self.span.tr(dcx),
497 // ______________________________________________________________________
498 // Encoding and decoding of MethodCallee
500 trait read_method_callee_helper<'tcx> {
501 fn read_method_callee<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
502 -> (u32, ty::MethodCallee<'tcx>);
505 fn encode_method_callee<'a, 'tcx>(ecx: &e::EncodeContext<'a, 'tcx>,
506 rbml_w: &mut Encoder,
508 method: &ty::MethodCallee<'tcx>) {
509 use serialize::Encoder;
511 rbml_w.emit_struct("MethodCallee", 4, |rbml_w| {
512 rbml_w.emit_struct_field("autoderef", 0, |rbml_w| {
513 autoderef.encode(rbml_w)
515 rbml_w.emit_struct_field("def_id", 1, |rbml_w| {
516 Ok(rbml_w.emit_def_id(method.def_id))
518 rbml_w.emit_struct_field("ty", 2, |rbml_w| {
519 Ok(rbml_w.emit_ty(ecx, method.ty))
521 rbml_w.emit_struct_field("substs", 3, |rbml_w| {
522 Ok(rbml_w.emit_substs(ecx, &method.substs))
527 impl<'a, 'tcx> read_method_callee_helper<'tcx> for reader::Decoder<'a> {
528 fn read_method_callee<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
529 -> (u32, ty::MethodCallee<'tcx>) {
531 self.read_struct("MethodCallee", 4, |this| {
532 let autoderef = this.read_struct_field("autoderef", 0,
533 Decodable::decode).unwrap();
534 Ok((autoderef, ty::MethodCallee {
535 def_id: this.read_struct_field("def_id", 1, |this| {
536 Ok(this.read_def_id(dcx))
538 ty: this.read_struct_field("ty", 2, |this| {
539 Ok(this.read_ty(dcx))
541 substs: this.read_struct_field("substs", 3, |this| {
542 Ok(dcx.tcx.mk_substs(this.read_substs(dcx)))
549 pub fn encode_cast_kind(ebml_w: &mut Encoder, kind: cast::CastKind) {
550 kind.encode(ebml_w).unwrap();
553 // ______________________________________________________________________
554 // Encoding and decoding the side tables
556 trait get_ty_str_ctxt<'tcx> {
557 fn ty_str_ctxt<'a>(&'a self) -> tyencode::ctxt<'a, 'tcx>;
560 impl<'a, 'tcx> get_ty_str_ctxt<'tcx> for e::EncodeContext<'a, 'tcx> {
561 fn ty_str_ctxt<'b>(&'b self) -> tyencode::ctxt<'b, 'tcx> {
563 diag: self.tcx.sess.diagnostic(),
564 ds: e::def_to_string,
566 abbrevs: &self.type_abbrevs
571 trait rbml_writer_helpers<'tcx> {
572 fn emit_region(&mut self, ecx: &e::EncodeContext, r: ty::Region);
573 fn emit_ty<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>, ty: Ty<'tcx>);
574 fn emit_tys<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>, tys: &[Ty<'tcx>]);
575 fn emit_predicate<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
576 predicate: &ty::Predicate<'tcx>);
577 fn emit_trait_ref<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
578 ty: &ty::TraitRef<'tcx>);
579 fn emit_substs<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
580 substs: &subst::Substs<'tcx>);
581 fn emit_existential_bounds<'b>(&mut self, ecx: &e::EncodeContext<'b,'tcx>,
582 bounds: &ty::ExistentialBounds<'tcx>);
583 fn emit_builtin_bounds(&mut self, ecx: &e::EncodeContext, bounds: &ty::BuiltinBounds);
584 fn emit_upvar_capture(&mut self, ecx: &e::EncodeContext, capture: &ty::UpvarCapture);
585 fn emit_auto_adjustment<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
586 adj: &adjustment::AutoAdjustment<'tcx>);
587 fn emit_autoref<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
588 autoref: &adjustment::AutoRef<'tcx>);
589 fn emit_auto_deref_ref<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
590 auto_deref_ref: &adjustment::AutoDerefRef<'tcx>);
593 impl<'a, 'tcx> rbml_writer_helpers<'tcx> for Encoder<'a> {
594 fn emit_region(&mut self, ecx: &e::EncodeContext, r: ty::Region) {
595 self.emit_opaque(|this| Ok(e::write_region(ecx, this, r)));
598 fn emit_ty<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>, ty: Ty<'tcx>) {
599 self.emit_opaque(|this| Ok(e::write_type(ecx, this, ty)));
602 fn emit_tys<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>, tys: &[Ty<'tcx>]) {
603 self.emit_from_vec(tys, |this, ty| Ok(this.emit_ty(ecx, *ty)));
606 fn emit_trait_ref<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
607 trait_ref: &ty::TraitRef<'tcx>) {
608 self.emit_opaque(|this| Ok(e::write_trait_ref(ecx, this, trait_ref)));
611 fn emit_predicate<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
612 predicate: &ty::Predicate<'tcx>) {
613 self.emit_opaque(|this| {
614 Ok(tyencode::enc_predicate(this,
620 fn emit_existential_bounds<'b>(&mut self, ecx: &e::EncodeContext<'b,'tcx>,
621 bounds: &ty::ExistentialBounds<'tcx>) {
622 self.emit_opaque(|this| Ok(tyencode::enc_existential_bounds(this,
627 fn emit_builtin_bounds(&mut self, ecx: &e::EncodeContext, bounds: &ty::BuiltinBounds) {
628 self.emit_opaque(|this| Ok(tyencode::enc_builtin_bounds(this,
633 fn emit_upvar_capture(&mut self, ecx: &e::EncodeContext, capture: &ty::UpvarCapture) {
634 use serialize::Encoder;
636 self.emit_enum("UpvarCapture", |this| {
638 ty::UpvarCapture::ByValue => {
639 this.emit_enum_variant("ByValue", 1, 0, |_| Ok(()))
641 ty::UpvarCapture::ByRef(ty::UpvarBorrow { kind, region }) => {
642 this.emit_enum_variant("ByRef", 2, 0, |this| {
643 this.emit_enum_variant_arg(0,
644 |this| kind.encode(this));
645 this.emit_enum_variant_arg(1,
646 |this| Ok(this.emit_region(ecx, region)))
653 fn emit_substs<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
654 substs: &subst::Substs<'tcx>) {
655 self.emit_opaque(|this| Ok(tyencode::enc_substs(this,
660 fn emit_auto_adjustment<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
661 adj: &adjustment::AutoAdjustment<'tcx>) {
662 use serialize::Encoder;
664 self.emit_enum("AutoAdjustment", |this| {
666 adjustment::AdjustReifyFnPointer=> {
667 this.emit_enum_variant("AdjustReifyFnPointer", 1, 0, |_| Ok(()))
670 adjustment::AdjustUnsafeFnPointer => {
671 this.emit_enum_variant("AdjustUnsafeFnPointer", 2, 0, |_| {
676 adjustment::AdjustDerefRef(ref auto_deref_ref) => {
677 this.emit_enum_variant("AdjustDerefRef", 3, 2, |this| {
678 this.emit_enum_variant_arg(0,
679 |this| Ok(this.emit_auto_deref_ref(ecx, auto_deref_ref)))
686 fn emit_autoref<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
687 autoref: &adjustment::AutoRef<'tcx>) {
688 use serialize::Encoder;
690 self.emit_enum("AutoRef", |this| {
692 &adjustment::AutoPtr(r, m) => {
693 this.emit_enum_variant("AutoPtr", 0, 2, |this| {
694 this.emit_enum_variant_arg(0,
695 |this| Ok(this.emit_region(ecx, *r)));
696 this.emit_enum_variant_arg(1, |this| m.encode(this))
699 &adjustment::AutoUnsafe(m) => {
700 this.emit_enum_variant("AutoUnsafe", 1, 1, |this| {
701 this.emit_enum_variant_arg(0, |this| m.encode(this))
708 fn emit_auto_deref_ref<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
709 auto_deref_ref: &adjustment::AutoDerefRef<'tcx>) {
710 use serialize::Encoder;
712 self.emit_struct("AutoDerefRef", 2, |this| {
713 this.emit_struct_field("autoderefs", 0, |this| auto_deref_ref.autoderefs.encode(this));
715 this.emit_struct_field("autoref", 1, |this| {
716 this.emit_option(|this| {
717 match auto_deref_ref.autoref {
718 None => this.emit_option_none(),
719 Some(ref a) => this.emit_option_some(|this| Ok(this.emit_autoref(ecx, a))),
724 this.emit_struct_field("unsize", 2, |this| {
725 this.emit_option(|this| {
726 match auto_deref_ref.unsize {
727 None => this.emit_option_none(),
728 Some(target) => this.emit_option_some(|this| {
729 Ok(this.emit_ty(ecx, target))
738 trait write_tag_and_id {
739 fn tag<F>(&mut self, tag_id: c::astencode_tag, f: F) where F: FnOnce(&mut Self);
740 fn id(&mut self, id: ast::NodeId);
743 impl<'a> write_tag_and_id for Encoder<'a> {
745 tag_id: c::astencode_tag,
747 F: FnOnce(&mut Encoder<'a>),
749 self.start_tag(tag_id as usize);
754 fn id(&mut self, id: ast::NodeId) {
755 id.encode(self).unwrap();
759 struct SideTableEncodingIdVisitor<'a, 'b:'a, 'c:'a, 'tcx:'c> {
760 ecx: &'a e::EncodeContext<'c, 'tcx>,
761 rbml_w: &'a mut Encoder<'b>,
764 impl<'a, 'b, 'c, 'tcx> ast_util::IdVisitingOperation for
765 SideTableEncodingIdVisitor<'a, 'b, 'c, 'tcx> {
766 fn visit_id(&mut self, id: ast::NodeId) {
767 encode_side_tables_for_id(self.ecx, self.rbml_w, id)
771 fn encode_side_tables_for_ii(ecx: &e::EncodeContext,
772 rbml_w: &mut Encoder,
774 rbml_w.start_tag(c::tag_table as usize);
775 ii.visit_ids(&mut SideTableEncodingIdVisitor {
782 fn encode_side_tables_for_id(ecx: &e::EncodeContext,
783 rbml_w: &mut Encoder,
787 debug!("Encoding side tables for id {}", id);
789 if let Some(def) = tcx.def_map.borrow().get(&id).map(|d| d.full_def()) {
790 rbml_w.tag(c::tag_table_def, |rbml_w| {
792 def.encode(rbml_w).unwrap();
796 if let Some(ty) = tcx.node_types().get(&id) {
797 rbml_w.tag(c::tag_table_node_type, |rbml_w| {
799 rbml_w.emit_ty(ecx, *ty);
803 if let Some(item_substs) = tcx.tables.borrow().item_substs.get(&id) {
804 rbml_w.tag(c::tag_table_item_subst, |rbml_w| {
806 rbml_w.emit_substs(ecx, &item_substs.substs);
810 if let Some(fv) = tcx.freevars.borrow().get(&id) {
811 rbml_w.tag(c::tag_table_freevars, |rbml_w| {
813 rbml_w.emit_from_vec(fv, |rbml_w, fv_entry| {
814 Ok(encode_freevar_entry(rbml_w, fv_entry))
819 rbml_w.tag(c::tag_table_upvar_capture_map, |rbml_w| {
822 let var_id = freevar.def.var_id();
823 let upvar_id = ty::UpvarId {
827 let upvar_capture = tcx.tables
833 var_id.encode(rbml_w);
834 rbml_w.emit_upvar_capture(ecx, &upvar_capture);
839 let method_call = ty::MethodCall::expr(id);
840 if let Some(method) = tcx.tables.borrow().method_map.get(&method_call) {
841 rbml_w.tag(c::tag_table_method_map, |rbml_w| {
843 encode_method_callee(ecx, rbml_w, method_call.autoderef, method)
847 if let Some(adjustment) = tcx.tables.borrow().adjustments.get(&id) {
849 adjustment::AdjustDerefRef(ref adj) => {
850 for autoderef in 0..adj.autoderefs {
851 let method_call = ty::MethodCall::autoderef(id, autoderef as u32);
852 if let Some(method) = tcx.tables.borrow().method_map.get(&method_call) {
853 rbml_w.tag(c::tag_table_method_map, |rbml_w| {
855 encode_method_callee(ecx, rbml_w,
856 method_call.autoderef, method)
864 rbml_w.tag(c::tag_table_adjustments, |rbml_w| {
866 rbml_w.emit_auto_adjustment(ecx, adjustment);
870 if let Some(cast_kind) = tcx.cast_kinds.borrow().get(&id) {
871 rbml_w.tag(c::tag_table_cast_kinds, |rbml_w| {
873 encode_cast_kind(rbml_w, *cast_kind)
877 if let Some(qualif) = tcx.const_qualif_map.borrow().get(&id) {
878 rbml_w.tag(c::tag_table_const_qualif, |rbml_w| {
880 qualif.encode(rbml_w).unwrap()
885 trait doc_decoder_helpers: Sized {
886 fn as_int(&self) -> isize;
887 fn opt_child(&self, tag: c::astencode_tag) -> Option<Self>;
890 impl<'a> doc_decoder_helpers for rbml::Doc<'a> {
891 fn as_int(&self) -> isize { reader::doc_as_u64(*self) as isize }
892 fn opt_child(&self, tag: c::astencode_tag) -> Option<rbml::Doc<'a>> {
893 reader::maybe_get_doc(*self, tag as usize)
897 trait rbml_decoder_decoder_helpers<'tcx> {
898 fn read_ty_encoded<'a, 'b, F, R>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>,
900 where F: for<'x> FnOnce(&mut tydecode::TyDecoder<'x, 'tcx>) -> R;
902 fn read_region(&mut self, dcx: &DecodeContext) -> ty::Region;
903 fn read_ty<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>) -> Ty<'tcx>;
904 fn read_tys<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>) -> Vec<Ty<'tcx>>;
905 fn read_trait_ref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
906 -> ty::TraitRef<'tcx>;
907 fn read_poly_trait_ref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
908 -> ty::PolyTraitRef<'tcx>;
909 fn read_predicate<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
910 -> ty::Predicate<'tcx>;
911 fn read_existential_bounds<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
912 -> ty::ExistentialBounds<'tcx>;
913 fn read_substs<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
914 -> subst::Substs<'tcx>;
915 fn read_upvar_capture(&mut self, dcx: &DecodeContext)
917 fn read_auto_adjustment<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
918 -> adjustment::AutoAdjustment<'tcx>;
919 fn read_cast_kind<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
921 fn read_auto_deref_ref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
922 -> adjustment::AutoDerefRef<'tcx>;
923 fn read_autoref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
924 -> adjustment::AutoRef<'tcx>;
925 fn convert_def_id(&mut self,
930 // Versions of the type reading functions that don't need the full
932 fn read_ty_nodcx(&mut self,
933 tcx: &ty::ctxt<'tcx>, cdata: &cstore::crate_metadata) -> Ty<'tcx>;
934 fn read_tys_nodcx(&mut self,
935 tcx: &ty::ctxt<'tcx>,
936 cdata: &cstore::crate_metadata) -> Vec<Ty<'tcx>>;
937 fn read_substs_nodcx(&mut self, tcx: &ty::ctxt<'tcx>,
938 cdata: &cstore::crate_metadata)
939 -> subst::Substs<'tcx>;
942 impl<'a, 'tcx> rbml_decoder_decoder_helpers<'tcx> for reader::Decoder<'a> {
943 fn read_ty_nodcx(&mut self,
944 tcx: &ty::ctxt<'tcx>,
945 cdata: &cstore::crate_metadata)
947 self.read_opaque(|_, doc| {
949 tydecode::TyDecoder::with_doc(tcx, cdata.cnum, doc,
950 &mut |id| decoder::translate_def_id(cdata, id))
955 fn read_tys_nodcx(&mut self,
956 tcx: &ty::ctxt<'tcx>,
957 cdata: &cstore::crate_metadata) -> Vec<Ty<'tcx>> {
958 self.read_to_vec(|this| Ok(this.read_ty_nodcx(tcx, cdata)) )
964 fn read_substs_nodcx(&mut self,
965 tcx: &ty::ctxt<'tcx>,
966 cdata: &cstore::crate_metadata)
967 -> subst::Substs<'tcx>
969 self.read_opaque(|_, doc| {
971 tydecode::TyDecoder::with_doc(tcx, cdata.cnum, doc,
972 &mut |id| decoder::translate_def_id(cdata, id))
977 fn read_ty_encoded<'b, 'c, F, R>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>, op: F) -> R
978 where F: for<'x> FnOnce(&mut tydecode::TyDecoder<'x,'tcx>) -> R
980 return self.read_opaque(|this, doc| {
981 debug!("read_ty_encoded({})", type_string(doc));
983 &mut tydecode::TyDecoder::with_doc(
984 dcx.tcx, dcx.cdata.cnum, doc,
985 &mut |a| this.convert_def_id(dcx, a))))
988 fn type_string(doc: rbml::Doc) -> String {
989 let mut str = String::new();
990 for i in doc.start..doc.end {
991 str.push(doc.data[i] as char);
996 fn read_region(&mut self, dcx: &DecodeContext) -> ty::Region {
997 // Note: regions types embed local node ids. In principle, we
998 // should translate these node ids into the new decode
999 // context. However, we do not bother, because region types
1000 // are not used during trans. This also applies to read_ty.
1001 return self.read_ty_encoded(dcx, |decoder| decoder.parse_region());
1003 fn read_ty<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>) -> Ty<'tcx> {
1004 return self.read_ty_encoded(dcx, |decoder| decoder.parse_ty());
1007 fn read_tys<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1009 self.read_to_vec(|this| Ok(this.read_ty(dcx))).unwrap().into_iter().collect()
1012 fn read_trait_ref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1013 -> ty::TraitRef<'tcx> {
1014 self.read_ty_encoded(dcx, |decoder| decoder.parse_trait_ref())
1017 fn read_poly_trait_ref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1018 -> ty::PolyTraitRef<'tcx> {
1019 ty::Binder(self.read_ty_encoded(dcx, |decoder| decoder.parse_trait_ref()))
1022 fn read_predicate<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1023 -> ty::Predicate<'tcx>
1025 self.read_ty_encoded(dcx, |decoder| decoder.parse_predicate())
1028 fn read_existential_bounds<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1029 -> ty::ExistentialBounds<'tcx>
1031 self.read_ty_encoded(dcx, |decoder| decoder.parse_existential_bounds())
1034 fn read_substs<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1035 -> subst::Substs<'tcx> {
1036 self.read_opaque(|this, doc| {
1037 Ok(tydecode::TyDecoder::with_doc(dcx.tcx, dcx.cdata.cnum, doc,
1038 &mut |a| this.convert_def_id(dcx, a))
1042 fn read_upvar_capture(&mut self, dcx: &DecodeContext) -> ty::UpvarCapture {
1043 self.read_enum("UpvarCapture", |this| {
1044 let variants = ["ByValue", "ByRef"];
1045 this.read_enum_variant(&variants, |this, i| {
1047 1 => ty::UpvarCapture::ByValue,
1048 2 => ty::UpvarCapture::ByRef(ty::UpvarBorrow {
1049 kind: this.read_enum_variant_arg(0,
1050 |this| Decodable::decode(this)).unwrap(),
1051 region: this.read_enum_variant_arg(1,
1052 |this| Ok(this.read_region(dcx))).unwrap()
1054 _ => panic!("bad enum variant for ty::UpvarCapture")
1059 fn read_auto_adjustment<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1060 -> adjustment::AutoAdjustment<'tcx> {
1061 self.read_enum("AutoAdjustment", |this| {
1062 let variants = ["AdjustReifyFnPointer", "AdjustUnsafeFnPointer", "AdjustDerefRef"];
1063 this.read_enum_variant(&variants, |this, i| {
1065 1 => adjustment::AdjustReifyFnPointer,
1066 2 => adjustment::AdjustUnsafeFnPointer,
1068 let auto_deref_ref: adjustment::AutoDerefRef =
1069 this.read_enum_variant_arg(0,
1070 |this| Ok(this.read_auto_deref_ref(dcx))).unwrap();
1072 adjustment::AdjustDerefRef(auto_deref_ref)
1074 _ => panic!("bad enum variant for adjustment::AutoAdjustment")
1080 fn read_auto_deref_ref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1081 -> adjustment::AutoDerefRef<'tcx> {
1082 self.read_struct("AutoDerefRef", 2, |this| {
1083 Ok(adjustment::AutoDerefRef {
1084 autoderefs: this.read_struct_field("autoderefs", 0, |this| {
1085 Decodable::decode(this)
1087 autoref: this.read_struct_field("autoref", 1, |this| {
1088 this.read_option(|this, b| {
1090 Ok(Some(this.read_autoref(dcx)))
1096 unsize: this.read_struct_field("unsize", 2, |this| {
1097 this.read_option(|this, b| {
1099 Ok(Some(this.read_ty(dcx)))
1109 fn read_autoref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1110 -> adjustment::AutoRef<'tcx> {
1111 self.read_enum("AutoRef", |this| {
1112 let variants = ["AutoPtr", "AutoUnsafe"];
1113 this.read_enum_variant(&variants, |this, i| {
1117 this.read_enum_variant_arg(0, |this| {
1118 Ok(this.read_region(dcx))
1120 let m: hir::Mutability =
1121 this.read_enum_variant_arg(1, |this| {
1122 Decodable::decode(this)
1125 adjustment::AutoPtr(dcx.tcx.mk_region(r), m)
1128 let m: hir::Mutability =
1129 this.read_enum_variant_arg(0, |this| Decodable::decode(this)).unwrap();
1131 adjustment::AutoUnsafe(m)
1133 _ => panic!("bad enum variant for adjustment::AutoRef")
1139 fn read_cast_kind<'b, 'c>(&mut self, _dcx: &DecodeContext<'b, 'c, 'tcx>)
1142 Decodable::decode(self).unwrap()
1145 /// Converts a def-id that appears in a type. The correct
1146 /// translation will depend on what kind of def-id this is.
1147 /// This is a subtle point: type definitions are not
1148 /// inlined into the current crate, so if the def-id names
1149 /// a nominal type or type alias, then it should be
1150 /// translated to refer to the source crate.
1152 /// However, *type parameters* are cloned along with the function
1153 /// they are attached to. So we should translate those def-ids
1154 /// to refer to the new, cloned copy of the type parameter.
1155 /// We only see references to free type parameters in the body of
1156 /// an inlined function. In such cases, we need the def-id to
1157 /// be a local id so that the TypeContents code is able to lookup
1158 /// the relevant info in the ty_param_defs table.
1160 /// *Region parameters*, unfortunately, are another kettle of fish.
1161 /// In such cases, def_id's can appear in types to distinguish
1162 /// shadowed bound regions and so forth. It doesn't actually
1163 /// matter so much what we do to these, since regions are erased
1164 /// at trans time, but it's good to keep them consistent just in
1165 /// case. We translate them with `tr_def_id()` which will map
1166 /// the crate numbers back to the original source crate.
1168 /// Scopes will end up as being totally bogus. This can actually
1169 /// be fixed though.
1171 /// Unboxed closures are cloned along with the function being
1172 /// inlined, and all side tables use interned node IDs, so we
1173 /// translate their def IDs accordingly.
1175 /// It'd be really nice to refactor the type repr to not include
1176 /// def-ids so that all these distinctions were unnecessary.
1177 fn convert_def_id(&mut self,
1178 dcx: &DecodeContext,
1181 let r = dcx.tr_def_id(did);
1182 debug!("convert_def_id(did={:?})={:?}", did, r);
1187 fn decode_side_tables(dcx: &DecodeContext,
1188 ast_doc: rbml::Doc) {
1189 let tbl_doc = ast_doc.get(c::tag_table as usize);
1190 for (tag, entry_doc) in reader::docs(tbl_doc) {
1191 let mut entry_dsr = reader::Decoder::new(entry_doc);
1192 let id0: ast::NodeId = Decodable::decode(&mut entry_dsr).unwrap();
1193 let id = dcx.tr_id(id0);
1195 debug!(">> Side table document with tag 0x{:x} \
1196 found for id {} (orig {})",
1198 let tag = tag as u32;
1199 let decoded_tag: Option<c::astencode_tag> = c::astencode_tag::from_u32(tag);
1203 &format!("unknown tag found in side tables: {:x}",
1207 let val_dsr = &mut entry_dsr;
1210 c::tag_table_def => {
1211 let def = decode_def(dcx, val_dsr);
1212 dcx.tcx.def_map.borrow_mut().insert(id, def::PathResolution {
1214 // This doesn't matter cross-crate.
1215 last_private: LastMod(AllPublic),
1219 c::tag_table_node_type => {
1220 let ty = val_dsr.read_ty(dcx);
1221 debug!("inserting ty for node {}: {:?}",
1223 dcx.tcx.node_type_insert(id, ty);
1225 c::tag_table_item_subst => {
1226 let item_substs = ty::ItemSubsts {
1227 substs: val_dsr.read_substs(dcx)
1229 dcx.tcx.tables.borrow_mut().item_substs.insert(
1232 c::tag_table_freevars => {
1233 let fv_info = val_dsr.read_to_vec(|val_dsr| {
1234 Ok(val_dsr.read_freevar_entry(dcx))
1235 }).unwrap().into_iter().collect();
1236 dcx.tcx.freevars.borrow_mut().insert(id, fv_info);
1238 c::tag_table_upvar_capture_map => {
1239 let var_id: ast::NodeId = Decodable::decode(val_dsr).unwrap();
1240 let upvar_id = ty::UpvarId {
1241 var_id: dcx.tr_id(var_id),
1244 let ub = val_dsr.read_upvar_capture(dcx);
1245 dcx.tcx.tables.borrow_mut().upvar_capture_map.insert(upvar_id, ub);
1247 c::tag_table_method_map => {
1248 let (autoderef, method) = val_dsr.read_method_callee(dcx);
1249 let method_call = ty::MethodCall {
1251 autoderef: autoderef
1253 dcx.tcx.tables.borrow_mut().method_map.insert(method_call, method);
1255 c::tag_table_adjustments => {
1257 val_dsr.read_auto_adjustment(dcx);
1258 dcx.tcx.tables.borrow_mut().adjustments.insert(id, adj);
1260 c::tag_table_cast_kinds => {
1262 val_dsr.read_cast_kind(dcx);
1263 dcx.tcx.cast_kinds.borrow_mut().insert(id, cast_kind);
1265 c::tag_table_const_qualif => {
1266 let qualif: ConstQualif = Decodable::decode(val_dsr).unwrap();
1267 dcx.tcx.const_qualif_map.borrow_mut().insert(id, qualif);
1271 &format!("unknown tag found in side tables: {:x}",
1278 debug!(">< Side table doc loaded");
1282 // copy the tcache entries from the original item to the new
1284 fn copy_item_types(dcx: &DecodeContext, ii: &InlinedItem, orig_did: DefId) {
1285 fn copy_item_type(dcx: &DecodeContext,
1286 inlined_id: ast::NodeId,
1287 remote_did: DefId) {
1288 let inlined_did = dcx.tcx.map.local_def_id(inlined_id);
1289 dcx.tcx.register_item_type(inlined_did,
1290 dcx.tcx.lookup_item_type(remote_did));
1293 // copy the entry for the item itself
1294 let item_node_id = match ii {
1295 &InlinedItem::Item(ref i) => i.id,
1296 &InlinedItem::TraitItem(_, ref ti) => ti.id,
1297 &InlinedItem::ImplItem(_, ref ii) => ii.id,
1298 &InlinedItem::Foreign(ref fi) => fi.id
1300 copy_item_type(dcx, item_node_id, orig_did);
1302 // copy the entries of inner items
1303 if let &InlinedItem::Item(ref item) = ii {
1305 hir::ItemEnum(ref def, _) => {
1306 let orig_def = dcx.tcx.lookup_adt_def(orig_did);
1307 for (i_variant, orig_variant) in
1308 def.variants.iter().zip(orig_def.variants.iter())
1310 debug!("astencode: copying variant {:?} => {:?}",
1311 orig_variant.did, i_variant.node.data.id());
1312 copy_item_type(dcx, i_variant.node.data.id(), orig_variant.did);
1315 hir::ItemStruct(ref def, _) => {
1316 if !def.is_struct() {
1317 let ctor_did = dcx.tcx.lookup_adt_def(orig_did)
1318 .struct_variant().did;
1319 debug!("astencode: copying ctor {:?} => {:?}", ctor_did,
1321 copy_item_type(dcx, def.id(), ctor_did);
1329 // ______________________________________________________________________
1330 // Testing of astencode_gen
1333 fn encode_item_ast(rbml_w: &mut Encoder, item: &hir::Item) {
1334 rbml_w.start_tag(c::tag_tree as usize);
1335 (*item).encode(rbml_w);
1340 fn decode_item_ast(par_doc: rbml::Doc) -> hir::Item {
1341 let chi_doc = par_doc.get(c::tag_tree as usize);
1342 let mut d = reader::Decoder::new(chi_doc);
1343 Decodable::decode(&mut d).unwrap()
1348 fn call_site(&self) -> codemap::Span;
1349 fn cfg(&self) -> ast::CrateConfig;
1350 fn ident_of(&self, st: &str) -> ast::Ident;
1351 fn name_of(&self, st: &str) -> ast::Name;
1352 fn parse_sess(&self) -> &parse::ParseSess;
1356 impl FakeExtCtxt for parse::ParseSess {
1357 fn call_site(&self) -> codemap::Span {
1359 lo: codemap::BytePos(0),
1360 hi: codemap::BytePos(0),
1361 expn_id: codemap::NO_EXPANSION,
1364 fn cfg(&self) -> ast::CrateConfig { Vec::new() }
1365 fn ident_of(&self, st: &str) -> ast::Ident {
1366 parse::token::str_to_ident(st)
1368 fn name_of(&self, st: &str) -> ast::Name {
1369 parse::token::intern(st)
1371 fn parse_sess(&self) -> &parse::ParseSess { self }
1375 struct FakeNodeIdAssigner;
1378 // It should go without saying that this may give unexpected results. Avoid
1379 // lowering anything which needs new nodes.
1380 impl NodeIdAssigner for FakeNodeIdAssigner {
1381 fn next_node_id(&self) -> NodeId {
1385 fn peek_node_id(&self) -> NodeId {
1391 fn mk_ctxt() -> parse::ParseSess {
1392 parse::ParseSess::new()
1396 fn roundtrip(in_item: P<hir::Item>) {
1397 let mut wr = Cursor::new(Vec::new());
1398 encode_item_ast(&mut Encoder::new(&mut wr), &*in_item);
1399 let rbml_doc = rbml::Doc::new(wr.get_ref());
1400 let out_item = decode_item_ast(rbml_doc);
1402 assert!(*in_item == out_item);
1408 let fnia = FakeNodeIdAssigner;
1409 let lcx = LoweringContext::new(&fnia, None);
1410 roundtrip(lower_item(&lcx, "e_item!(&cx,
1416 fn test_smalltalk() {
1418 let fnia = FakeNodeIdAssigner;
1419 let lcx = LoweringContext::new(&fnia, None);
1420 roundtrip(lower_item(&lcx, "e_item!(&cx,
1421 fn foo() -> isize { 3 + 4 } // first smalltalk program ever executed.
1428 let fnia = FakeNodeIdAssigner;
1429 let lcx = LoweringContext::new(&fnia, None);
1430 roundtrip(lower_item(&lcx, "e_item!(&cx,
1431 fn foo(x: usize, y: usize) -> usize {
1439 fn test_simplification() {
1441 let item = quote_item!(&cx,
1442 fn new_int_alist<B>() -> alist<isize, B> {
1443 fn eq_int(a: isize, b: isize) -> bool { a == b }
1444 return alist {eq_fn: eq_int, data: Vec::new()};
1447 let fnia = FakeNodeIdAssigner;
1448 let lcx = LoweringContext::new(&fnia, None);
1449 let hir_item = lower_item(&lcx, &item);
1450 let item_in = InlinedItemRef::Item(&hir_item);
1451 let item_out = simplify_ast(item_in);
1452 let item_exp = InlinedItem::Item(lower_item(&lcx, "e_item!(&cx,
1453 fn new_int_alist<B>() -> alist<isize, B> {
1454 return alist {eq_fn: eq_int, data: Vec::new()};
1457 match (item_out, item_exp) {
1458 (InlinedItem::Item(item_out), InlinedItem::Item(item_exp)) => {
1459 assert!(pprust::item_to_string(&*item_out) ==
1460 pprust::item_to_string(&*item_exp));