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::codemap::Span;
43 use std::io::SeekFrom;
44 use std::io::prelude::*;
48 use rbml::writer::Encoder;
51 use serialize::{Decodable, Decoder, DecoderHelpers, Encodable};
52 use serialize::EncoderHelpers;
54 #[cfg(test)] use std::io::Cursor;
55 #[cfg(test)] use syntax::parse;
56 #[cfg(test)] use rustc_front::print::pprust;
57 #[cfg(test)] use rustc_front::lowering::lower_item;
59 struct DecodeContext<'a, 'b, 'tcx: 'a> {
60 tcx: &'a ty::ctxt<'tcx>,
61 cdata: &'b cstore::crate_metadata,
62 from_id_range: ast_util::IdRange,
63 to_id_range: ast_util::IdRange,
64 // Cache the last used filemap for translating spans as an optimization.
65 last_filemap_index: Cell<usize>,
69 fn tr(&self, dcx: &DecodeContext) -> Self;
72 // ______________________________________________________________________
75 pub fn encode_inlined_item(ecx: &e::EncodeContext,
79 InlinedItemRef::Item(i) => i.id,
80 InlinedItemRef::Foreign(i) => i.id,
81 InlinedItemRef::TraitItem(_, ti) => ti.id,
82 InlinedItemRef::ImplItem(_, ii) => ii.id,
84 debug!("> Encoding inlined item: {} ({:?})",
85 ecx.tcx.map.path_to_string(id),
86 rbml_w.writer.seek(SeekFrom::Current(0)));
88 // Folding could be avoided with a smarter encoder.
89 let ii = simplify_ast(ii);
90 let id_range = ii.compute_id_range();
92 rbml_w.start_tag(c::tag_ast as usize);
93 id_range.encode(rbml_w);
94 encode_ast(rbml_w, &ii);
95 encode_side_tables_for_ii(ecx, rbml_w, &ii);
98 debug!("< Encoded inlined fn: {} ({:?})",
99 ecx.tcx.map.path_to_string(id),
100 rbml_w.writer.seek(SeekFrom::Current(0)));
103 impl<'a, 'b, 'c, 'tcx> ast_map::FoldOps for &'a DecodeContext<'b, 'c, 'tcx> {
104 fn new_id(&self, id: ast::NodeId) -> ast::NodeId {
105 if id == ast::DUMMY_NODE_ID {
106 // Used by ast_map to map the NodeInlinedParent.
107 self.tcx.sess.next_node_id()
112 fn new_def_id(&self, def_id: DefId) -> DefId {
113 self.tr_def_id(def_id)
115 fn new_span(&self, span: Span) -> Span {
120 /// Decodes an item from its AST in the cdata's metadata and adds it to the
122 pub fn decode_inlined_item<'tcx>(cdata: &cstore::crate_metadata,
123 tcx: &ty::ctxt<'tcx>,
124 path: Vec<ast_map::PathElem>,
125 def_path: ast_map::DefPath,
128 -> Result<&'tcx InlinedItem, (Vec<ast_map::PathElem>,
130 match par_doc.opt_child(c::tag_ast) {
131 None => Err((path, def_path)),
133 let mut path_as_str = None;
134 debug!("> Decoding inlined fn: {:?}::?",
136 // Do an Option dance to use the path after it is moved below.
137 let s = ast_map::path_to_string(path.iter().cloned());
138 path_as_str = Some(s);
139 path_as_str.as_ref().map(|x| &x[..])
141 let mut ast_dsr = reader::Decoder::new(ast_doc);
142 let from_id_range = Decodable::decode(&mut ast_dsr).unwrap();
143 let to_id_range = reserve_id_range(&tcx.sess, from_id_range);
144 let dcx = &DecodeContext {
147 from_id_range: from_id_range,
148 to_id_range: to_id_range,
149 last_filemap_index: Cell::new(0)
151 let raw_ii = decode_ast(ast_doc);
152 let ii = ast_map::map_decoded_item(&dcx.tcx.map, path, def_path, raw_ii, dcx);
154 let name = match *ii {
155 InlinedItem::Item(ref i) => i.name,
156 InlinedItem::Foreign(ref i) => i.name,
157 InlinedItem::TraitItem(_, ref ti) => ti.name,
158 InlinedItem::ImplItem(_, ref ii) => ii.name
160 debug!("Fn named: {}", name);
161 debug!("< Decoded inlined fn: {}::{}",
162 path_as_str.unwrap(),
164 region::resolve_inlined_item(&tcx.sess, &tcx.region_maps, ii);
165 decode_side_tables(dcx, ast_doc);
166 copy_item_types(dcx, ii, orig_did);
168 InlinedItem::Item(ref i) => {
169 debug!(">>> DECODED ITEM >>>\n{}\n<<< DECODED ITEM <<<",
170 ::rustc_front::print::pprust::item_to_string(&**i));
179 // ______________________________________________________________________
180 // Enumerating the IDs which appear in an AST
182 fn reserve_id_range(sess: &Session,
183 from_id_range: ast_util::IdRange) -> ast_util::IdRange {
184 // Handle the case of an empty range:
185 if from_id_range.empty() { return from_id_range; }
186 let cnt = from_id_range.max - from_id_range.min;
187 let to_id_min = sess.reserve_node_ids(cnt);
188 let to_id_max = to_id_min + cnt;
189 ast_util::IdRange { min: to_id_min, max: to_id_max }
192 impl<'a, 'b, 'tcx> DecodeContext<'a, 'b, 'tcx> {
193 /// Translates an internal id, meaning a node id that is known to refer to some part of the
194 /// item currently being inlined, such as a local variable or argument. All naked node-ids
195 /// that appear in types have this property, since if something might refer to an external item
196 /// we would use a def-id to allow for the possibility that the item resides in another crate.
197 pub fn tr_id(&self, id: ast::NodeId) -> ast::NodeId {
198 // from_id_range should be non-empty
199 assert!(!self.from_id_range.empty());
200 // Use wrapping arithmetic because otherwise it introduces control flow.
201 // Maybe we should just have the control flow? -- aatch
202 (id.wrapping_sub(self.from_id_range.min).wrapping_add(self.to_id_range.min))
205 /// Translates an EXTERNAL def-id, converting the crate number from the one used in the encoded
206 /// data to the current crate numbers.. By external, I mean that it be translated to a
207 /// reference to the item in its original crate, as opposed to being translated to a reference
208 /// to the inlined version of the item. This is typically, but not always, what you want,
209 /// because most def-ids refer to external things like types or other fns that may or may not
210 /// be inlined. Note that even when the inlined function is referencing itself recursively, we
211 /// would want `tr_def_id` for that reference--- conceptually the function calls the original,
212 /// non-inlined version, and trans deals with linking that recursive call to the inlined copy.
213 pub fn tr_def_id(&self, did: DefId) -> DefId {
214 decoder::translate_def_id(self.cdata, did)
217 /// Translates a `Span` from an extern crate to the corresponding `Span`
218 /// within the local crate's codemap. `creader::import_codemap()` will
219 /// already have allocated any additionally needed FileMaps in the local
220 /// codemap as a side-effect of creating the crate_metadata's
221 /// `codemap_import_info`.
222 pub fn tr_span(&self, span: Span) -> Span {
223 let span = if span.lo > span.hi {
224 // Currently macro expansion sometimes produces invalid Span values
225 // where lo > hi. In order not to crash the compiler when trying to
226 // translate these values, let's transform them into something we
227 // can handle (and which will produce useful debug locations at
228 // least some of the time).
229 // This workaround is only necessary as long as macro expansion is
230 // not fixed. FIXME(#23480)
231 codemap::mk_sp(span.lo, span.lo)
236 let imported_filemaps = self.cdata.imported_filemaps(self.tcx.sess.codemap());
238 // Optimize for the case that most spans within a translated item
239 // originate from the same filemap.
240 let last_filemap_index = self.last_filemap_index.get();
241 let last_filemap = &imported_filemaps[last_filemap_index];
243 if span.lo >= last_filemap.original_start_pos &&
244 span.lo <= last_filemap.original_end_pos &&
245 span.hi >= last_filemap.original_start_pos &&
246 span.hi <= last_filemap.original_end_pos {
250 let mut b = imported_filemaps.len();
254 if imported_filemaps[m].original_start_pos > span.lo {
261 self.last_filemap_index.set(a);
262 &imported_filemaps[a]
266 let lo = (span.lo - filemap.original_start_pos) +
267 filemap.translated_filemap.start_pos;
268 let hi = (span.hi - filemap.original_start_pos) +
269 filemap.translated_filemap.start_pos;
271 codemap::mk_sp(lo, hi)
276 fn tr(&self, dcx: &DecodeContext) -> DefId {
281 impl tr for Option<DefId> {
282 fn tr(&self, dcx: &DecodeContext) -> Option<DefId> {
283 self.map(|d| dcx.tr_def_id(d))
288 fn tr(&self, dcx: &DecodeContext) -> Span {
293 trait def_id_encoder_helpers {
294 fn emit_def_id(&mut self, did: DefId);
297 impl<S:serialize::Encoder> def_id_encoder_helpers for S
298 where <S as serialize::serialize::Encoder>::Error: Debug
300 fn emit_def_id(&mut self, did: DefId) {
301 did.encode(self).unwrap()
305 trait def_id_decoder_helpers {
306 fn read_def_id(&mut self, dcx: &DecodeContext) -> DefId;
307 fn read_def_id_nodcx(&mut self,
308 cdata: &cstore::crate_metadata) -> DefId;
311 impl<D:serialize::Decoder> def_id_decoder_helpers for D
312 where <D as serialize::serialize::Decoder>::Error: Debug
314 fn read_def_id(&mut self, dcx: &DecodeContext) -> DefId {
315 let did: DefId = Decodable::decode(self).unwrap();
319 fn read_def_id_nodcx(&mut self,
320 cdata: &cstore::crate_metadata)
322 let did: DefId = Decodable::decode(self).unwrap();
323 decoder::translate_def_id(cdata, did)
327 // ______________________________________________________________________
328 // Encoding and decoding the AST itself
330 // When decoding, we have to renumber the AST so that the node ids that
331 // appear within are disjoint from the node ids in our existing ASTs.
332 // We also have to adjust the spans: for now we just insert a dummy span,
333 // but eventually we should add entries to the local codemap as required.
335 fn encode_ast(rbml_w: &mut Encoder, item: &InlinedItem) {
336 rbml_w.start_tag(c::tag_tree as usize);
341 struct NestedItemsDropper;
343 impl Folder for NestedItemsDropper {
344 fn fold_block(&mut self, blk: P<hir::Block>) -> P<hir::Block> {
345 blk.and_then(|hir::Block {id, stmts, expr, rules, span, ..}| {
346 let stmts_sans_items = stmts.into_iter().filter_map(|stmt| {
347 let use_stmt = match stmt.node {
348 hir::StmtExpr(_, _) | hir::StmtSemi(_, _) => true,
349 hir::StmtDecl(ref decl, _) => {
351 hir::DeclLocal(_) => true,
352 hir::DeclItem(_) => false,
362 let blk_sans_items = P(hir::Block {
363 stmts: stmts_sans_items,
369 fold::noop_fold_block(blk_sans_items, self)
374 // Produces a simplified copy of the AST which does not include things
375 // that we do not need to or do not want to export. For example, we
376 // do not include any nested items: if these nested items are to be
377 // inlined, their AST will be exported separately (this only makes
378 // sense because, in Rust, nested items are independent except for
379 // their visibility).
381 // As it happens, trans relies on the fact that we do not export
382 // nested items, as otherwise it would get confused when translating
384 fn simplify_ast(ii: InlinedItemRef) -> InlinedItem {
385 let mut fld = NestedItemsDropper;
388 // HACK we're not dropping items.
389 InlinedItemRef::Item(i) => {
390 InlinedItem::Item(fold::noop_fold_item(P(i.clone()), &mut fld)
391 .expect_one("expected one item"))
393 InlinedItemRef::TraitItem(d, ti) => {
394 InlinedItem::TraitItem(d,
395 fold::noop_fold_trait_item(P(ti.clone()), &mut fld)
396 .expect_one("noop_fold_trait_item must produce \
397 exactly one trait item"))
399 InlinedItemRef::ImplItem(d, ii) => {
400 InlinedItem::ImplItem(d,
401 fold::noop_fold_impl_item(P(ii.clone()), &mut fld)
402 .expect_one("noop_fold_impl_item must produce \
403 exactly one impl item"))
405 InlinedItemRef::Foreign(i) => {
406 InlinedItem::Foreign(fold::noop_fold_foreign_item(P(i.clone()), &mut fld))
411 fn decode_ast(par_doc: rbml::Doc) -> InlinedItem {
412 let chi_doc = par_doc.get(c::tag_tree as usize);
413 let mut d = reader::Decoder::new(chi_doc);
414 Decodable::decode(&mut d).unwrap()
417 // ______________________________________________________________________
418 // Encoding and decoding of ast::def
420 fn decode_def(dcx: &DecodeContext, dsr: &mut reader::Decoder) -> def::Def {
421 let def: def::Def = Decodable::decode(dsr).unwrap();
425 impl tr for def::Def {
426 fn tr(&self, dcx: &DecodeContext) -> def::Def {
428 def::DefFn(did, is_ctor) => def::DefFn(did.tr(dcx), is_ctor),
429 def::DefMethod(did) => def::DefMethod(did.tr(dcx)),
430 def::DefSelfTy(opt_did, impl_ids) => { def::DefSelfTy(opt_did.map(|did| did.tr(dcx)),
431 impl_ids.map(|(nid1, nid2)| {
435 def::DefMod(did) => { def::DefMod(did.tr(dcx)) }
436 def::DefForeignMod(did) => { def::DefForeignMod(did.tr(dcx)) }
437 def::DefStatic(did, m) => { def::DefStatic(did.tr(dcx), m) }
438 def::DefConst(did) => { def::DefConst(did.tr(dcx)) }
439 def::DefAssociatedConst(did) => def::DefAssociatedConst(did.tr(dcx)),
440 def::DefLocal(_, nid) => {
441 let nid = dcx.tr_id(nid);
442 let did = dcx.tcx.map.local_def_id(nid);
443 def::DefLocal(did, nid)
445 def::DefVariant(e_did, v_did, is_s) => {
446 def::DefVariant(e_did.tr(dcx), v_did.tr(dcx), is_s)
448 def::DefTrait(did) => def::DefTrait(did.tr(dcx)),
449 def::DefTy(did, is_enum) => def::DefTy(did.tr(dcx), is_enum),
450 def::DefAssociatedTy(trait_did, did) =>
451 def::DefAssociatedTy(trait_did.tr(dcx), did.tr(dcx)),
452 def::DefPrimTy(p) => def::DefPrimTy(p),
453 def::DefTyParam(s, index, def_id, n) => def::DefTyParam(s, index, def_id.tr(dcx), n),
454 def::DefUse(did) => def::DefUse(did.tr(dcx)),
455 def::DefUpvar(_, nid1, index, nid2) => {
456 let nid1 = dcx.tr_id(nid1);
457 let nid2 = dcx.tr_id(nid2);
458 let did1 = dcx.tcx.map.local_def_id(nid1);
459 def::DefUpvar(did1, nid1, index, nid2)
461 def::DefStruct(did) => def::DefStruct(did.tr(dcx)),
462 def::DefLabel(nid) => def::DefLabel(dcx.tr_id(nid))
467 // ______________________________________________________________________
468 // Encoding and decoding of freevar information
470 fn encode_freevar_entry(rbml_w: &mut Encoder, fv: &ty::Freevar) {
471 (*fv).encode(rbml_w).unwrap();
474 trait rbml_decoder_helper {
475 fn read_freevar_entry(&mut self, dcx: &DecodeContext)
477 fn read_capture_mode(&mut self) -> hir::CaptureClause;
480 impl<'a> rbml_decoder_helper for reader::Decoder<'a> {
481 fn read_freevar_entry(&mut self, dcx: &DecodeContext)
483 let fv: ty::Freevar = Decodable::decode(self).unwrap();
487 fn read_capture_mode(&mut self) -> hir::CaptureClause {
488 let cm: hir::CaptureClause = Decodable::decode(self).unwrap();
493 impl tr for ty::Freevar {
494 fn tr(&self, dcx: &DecodeContext) -> ty::Freevar {
496 def: self.def.tr(dcx),
497 span: self.span.tr(dcx),
502 // ______________________________________________________________________
503 // Encoding and decoding of MethodCallee
505 trait read_method_callee_helper<'tcx> {
506 fn read_method_callee<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
507 -> (u32, ty::MethodCallee<'tcx>);
510 fn encode_method_callee<'a, 'tcx>(ecx: &e::EncodeContext<'a, 'tcx>,
511 rbml_w: &mut Encoder,
513 method: &ty::MethodCallee<'tcx>) {
514 use serialize::Encoder;
516 rbml_w.emit_struct("MethodCallee", 4, |rbml_w| {
517 rbml_w.emit_struct_field("autoderef", 0, |rbml_w| {
518 autoderef.encode(rbml_w)
520 rbml_w.emit_struct_field("def_id", 1, |rbml_w| {
521 Ok(rbml_w.emit_def_id(method.def_id))
523 rbml_w.emit_struct_field("ty", 2, |rbml_w| {
524 Ok(rbml_w.emit_ty(ecx, method.ty))
526 rbml_w.emit_struct_field("substs", 3, |rbml_w| {
527 Ok(rbml_w.emit_substs(ecx, &method.substs))
532 impl<'a, 'tcx> read_method_callee_helper<'tcx> for reader::Decoder<'a> {
533 fn read_method_callee<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
534 -> (u32, ty::MethodCallee<'tcx>) {
536 self.read_struct("MethodCallee", 4, |this| {
537 let autoderef = this.read_struct_field("autoderef", 0,
538 Decodable::decode).unwrap();
539 Ok((autoderef, ty::MethodCallee {
540 def_id: this.read_struct_field("def_id", 1, |this| {
541 Ok(this.read_def_id(dcx))
543 ty: this.read_struct_field("ty", 2, |this| {
544 Ok(this.read_ty(dcx))
546 substs: this.read_struct_field("substs", 3, |this| {
547 Ok(dcx.tcx.mk_substs(this.read_substs(dcx)))
554 pub fn encode_cast_kind(ebml_w: &mut Encoder, kind: cast::CastKind) {
555 kind.encode(ebml_w).unwrap();
558 // ______________________________________________________________________
559 // Encoding and decoding the side tables
561 trait get_ty_str_ctxt<'tcx> {
562 fn ty_str_ctxt<'a>(&'a self) -> tyencode::ctxt<'a, 'tcx>;
565 impl<'a, 'tcx> get_ty_str_ctxt<'tcx> for e::EncodeContext<'a, 'tcx> {
566 fn ty_str_ctxt<'b>(&'b self) -> tyencode::ctxt<'b, 'tcx> {
568 diag: self.tcx.sess.diagnostic(),
569 ds: e::def_to_string,
571 abbrevs: &self.type_abbrevs
576 trait rbml_writer_helpers<'tcx> {
577 fn emit_region(&mut self, ecx: &e::EncodeContext, r: ty::Region);
578 fn emit_ty<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>, ty: Ty<'tcx>);
579 fn emit_tys<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>, tys: &[Ty<'tcx>]);
580 fn emit_predicate<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
581 predicate: &ty::Predicate<'tcx>);
582 fn emit_trait_ref<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
583 ty: &ty::TraitRef<'tcx>);
584 fn emit_substs<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
585 substs: &subst::Substs<'tcx>);
586 fn emit_existential_bounds<'b>(&mut self, ecx: &e::EncodeContext<'b,'tcx>,
587 bounds: &ty::ExistentialBounds<'tcx>);
588 fn emit_builtin_bounds(&mut self, ecx: &e::EncodeContext, bounds: &ty::BuiltinBounds);
589 fn emit_upvar_capture(&mut self, ecx: &e::EncodeContext, capture: &ty::UpvarCapture);
590 fn emit_auto_adjustment<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
591 adj: &adjustment::AutoAdjustment<'tcx>);
592 fn emit_autoref<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
593 autoref: &adjustment::AutoRef<'tcx>);
594 fn emit_auto_deref_ref<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
595 auto_deref_ref: &adjustment::AutoDerefRef<'tcx>);
598 impl<'a, 'tcx> rbml_writer_helpers<'tcx> for Encoder<'a> {
599 fn emit_region(&mut self, ecx: &e::EncodeContext, r: ty::Region) {
600 self.emit_opaque(|this| Ok(e::write_region(ecx, this, r)));
603 fn emit_ty<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>, ty: Ty<'tcx>) {
604 self.emit_opaque(|this| Ok(e::write_type(ecx, this, ty)));
607 fn emit_tys<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>, tys: &[Ty<'tcx>]) {
608 self.emit_from_vec(tys, |this, ty| Ok(this.emit_ty(ecx, *ty)));
611 fn emit_trait_ref<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
612 trait_ref: &ty::TraitRef<'tcx>) {
613 self.emit_opaque(|this| Ok(e::write_trait_ref(ecx, this, trait_ref)));
616 fn emit_predicate<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
617 predicate: &ty::Predicate<'tcx>) {
618 self.emit_opaque(|this| {
619 Ok(tyencode::enc_predicate(this,
625 fn emit_existential_bounds<'b>(&mut self, ecx: &e::EncodeContext<'b,'tcx>,
626 bounds: &ty::ExistentialBounds<'tcx>) {
627 self.emit_opaque(|this| Ok(tyencode::enc_existential_bounds(this,
632 fn emit_builtin_bounds(&mut self, ecx: &e::EncodeContext, bounds: &ty::BuiltinBounds) {
633 self.emit_opaque(|this| Ok(tyencode::enc_builtin_bounds(this,
638 fn emit_upvar_capture(&mut self, ecx: &e::EncodeContext, capture: &ty::UpvarCapture) {
639 use serialize::Encoder;
641 self.emit_enum("UpvarCapture", |this| {
643 ty::UpvarCapture::ByValue => {
644 this.emit_enum_variant("ByValue", 1, 0, |_| Ok(()))
646 ty::UpvarCapture::ByRef(ty::UpvarBorrow { kind, region }) => {
647 this.emit_enum_variant("ByRef", 2, 0, |this| {
648 this.emit_enum_variant_arg(0,
649 |this| kind.encode(this));
650 this.emit_enum_variant_arg(1,
651 |this| Ok(this.emit_region(ecx, region)))
658 fn emit_substs<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
659 substs: &subst::Substs<'tcx>) {
660 self.emit_opaque(|this| Ok(tyencode::enc_substs(this,
665 fn emit_auto_adjustment<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
666 adj: &adjustment::AutoAdjustment<'tcx>) {
667 use serialize::Encoder;
669 self.emit_enum("AutoAdjustment", |this| {
671 adjustment::AdjustReifyFnPointer=> {
672 this.emit_enum_variant("AdjustReifyFnPointer", 1, 0, |_| Ok(()))
675 adjustment::AdjustUnsafeFnPointer => {
676 this.emit_enum_variant("AdjustUnsafeFnPointer", 2, 0, |_| {
681 adjustment::AdjustDerefRef(ref auto_deref_ref) => {
682 this.emit_enum_variant("AdjustDerefRef", 3, 2, |this| {
683 this.emit_enum_variant_arg(0,
684 |this| Ok(this.emit_auto_deref_ref(ecx, auto_deref_ref)))
691 fn emit_autoref<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
692 autoref: &adjustment::AutoRef<'tcx>) {
693 use serialize::Encoder;
695 self.emit_enum("AutoRef", |this| {
697 &adjustment::AutoPtr(r, m) => {
698 this.emit_enum_variant("AutoPtr", 0, 2, |this| {
699 this.emit_enum_variant_arg(0,
700 |this| Ok(this.emit_region(ecx, *r)));
701 this.emit_enum_variant_arg(1, |this| m.encode(this))
704 &adjustment::AutoUnsafe(m) => {
705 this.emit_enum_variant("AutoUnsafe", 1, 1, |this| {
706 this.emit_enum_variant_arg(0, |this| m.encode(this))
713 fn emit_auto_deref_ref<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
714 auto_deref_ref: &adjustment::AutoDerefRef<'tcx>) {
715 use serialize::Encoder;
717 self.emit_struct("AutoDerefRef", 2, |this| {
718 this.emit_struct_field("autoderefs", 0, |this| auto_deref_ref.autoderefs.encode(this));
720 this.emit_struct_field("autoref", 1, |this| {
721 this.emit_option(|this| {
722 match auto_deref_ref.autoref {
723 None => this.emit_option_none(),
724 Some(ref a) => this.emit_option_some(|this| Ok(this.emit_autoref(ecx, a))),
729 this.emit_struct_field("unsize", 2, |this| {
730 this.emit_option(|this| {
731 match auto_deref_ref.unsize {
732 None => this.emit_option_none(),
733 Some(target) => this.emit_option_some(|this| {
734 Ok(this.emit_ty(ecx, target))
743 trait write_tag_and_id {
744 fn tag<F>(&mut self, tag_id: c::astencode_tag, f: F) where F: FnOnce(&mut Self);
745 fn id(&mut self, id: ast::NodeId);
748 impl<'a> write_tag_and_id for Encoder<'a> {
750 tag_id: c::astencode_tag,
752 F: FnOnce(&mut Encoder<'a>),
754 self.start_tag(tag_id as usize);
759 fn id(&mut self, id: ast::NodeId) {
760 id.encode(self).unwrap();
764 struct SideTableEncodingIdVisitor<'a, 'b:'a, 'c:'a, 'tcx:'c> {
765 ecx: &'a e::EncodeContext<'c, 'tcx>,
766 rbml_w: &'a mut Encoder<'b>,
769 impl<'a, 'b, 'c, 'tcx> ast_util::IdVisitingOperation for
770 SideTableEncodingIdVisitor<'a, 'b, 'c, 'tcx> {
771 fn visit_id(&mut self, id: ast::NodeId) {
772 encode_side_tables_for_id(self.ecx, self.rbml_w, id)
776 fn encode_side_tables_for_ii(ecx: &e::EncodeContext,
777 rbml_w: &mut Encoder,
779 rbml_w.start_tag(c::tag_table as usize);
780 ii.visit_ids(&mut SideTableEncodingIdVisitor {
787 fn encode_side_tables_for_id(ecx: &e::EncodeContext,
788 rbml_w: &mut Encoder,
792 debug!("Encoding side tables for id {}", id);
794 if let Some(def) = tcx.def_map.borrow().get(&id).map(|d| d.full_def()) {
795 rbml_w.tag(c::tag_table_def, |rbml_w| {
797 def.encode(rbml_w).unwrap();
801 if let Some(ty) = tcx.node_types().get(&id) {
802 rbml_w.tag(c::tag_table_node_type, |rbml_w| {
804 rbml_w.emit_ty(ecx, *ty);
808 if let Some(item_substs) = tcx.tables.borrow().item_substs.get(&id) {
809 rbml_w.tag(c::tag_table_item_subst, |rbml_w| {
811 rbml_w.emit_substs(ecx, &item_substs.substs);
815 if let Some(fv) = tcx.freevars.borrow().get(&id) {
816 rbml_w.tag(c::tag_table_freevars, |rbml_w| {
818 rbml_w.emit_from_vec(fv, |rbml_w, fv_entry| {
819 Ok(encode_freevar_entry(rbml_w, fv_entry))
824 rbml_w.tag(c::tag_table_upvar_capture_map, |rbml_w| {
827 let var_id = freevar.def.var_id();
828 let upvar_id = ty::UpvarId {
832 let upvar_capture = tcx.tables
838 var_id.encode(rbml_w);
839 rbml_w.emit_upvar_capture(ecx, &upvar_capture);
844 let method_call = ty::MethodCall::expr(id);
845 if let Some(method) = tcx.tables.borrow().method_map.get(&method_call) {
846 rbml_w.tag(c::tag_table_method_map, |rbml_w| {
848 encode_method_callee(ecx, rbml_w, method_call.autoderef, method)
852 if let Some(adjustment) = tcx.tables.borrow().adjustments.get(&id) {
854 adjustment::AdjustDerefRef(ref adj) => {
855 for autoderef in 0..adj.autoderefs {
856 let method_call = ty::MethodCall::autoderef(id, autoderef as u32);
857 if let Some(method) = tcx.tables.borrow().method_map.get(&method_call) {
858 rbml_w.tag(c::tag_table_method_map, |rbml_w| {
860 encode_method_callee(ecx, rbml_w,
861 method_call.autoderef, method)
869 rbml_w.tag(c::tag_table_adjustments, |rbml_w| {
871 rbml_w.emit_auto_adjustment(ecx, adjustment);
875 if let Some(cast_kind) = tcx.cast_kinds.borrow().get(&id) {
876 rbml_w.tag(c::tag_table_cast_kinds, |rbml_w| {
878 encode_cast_kind(rbml_w, *cast_kind)
882 if let Some(qualif) = tcx.const_qualif_map.borrow().get(&id) {
883 rbml_w.tag(c::tag_table_const_qualif, |rbml_w| {
885 qualif.encode(rbml_w).unwrap()
890 trait doc_decoder_helpers: Sized {
891 fn as_int(&self) -> isize;
892 fn opt_child(&self, tag: c::astencode_tag) -> Option<Self>;
895 impl<'a> doc_decoder_helpers for rbml::Doc<'a> {
896 fn as_int(&self) -> isize { reader::doc_as_u64(*self) as isize }
897 fn opt_child(&self, tag: c::astencode_tag) -> Option<rbml::Doc<'a>> {
898 reader::maybe_get_doc(*self, tag as usize)
902 trait rbml_decoder_decoder_helpers<'tcx> {
903 fn read_ty_encoded<'a, 'b, F, R>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>,
905 where F: for<'x> FnOnce(&mut tydecode::TyDecoder<'x, 'tcx>) -> R;
907 fn read_region(&mut self, dcx: &DecodeContext) -> ty::Region;
908 fn read_ty<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>) -> Ty<'tcx>;
909 fn read_tys<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>) -> Vec<Ty<'tcx>>;
910 fn read_trait_ref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
911 -> ty::TraitRef<'tcx>;
912 fn read_poly_trait_ref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
913 -> ty::PolyTraitRef<'tcx>;
914 fn read_predicate<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
915 -> ty::Predicate<'tcx>;
916 fn read_existential_bounds<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
917 -> ty::ExistentialBounds<'tcx>;
918 fn read_substs<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
919 -> subst::Substs<'tcx>;
920 fn read_upvar_capture(&mut self, dcx: &DecodeContext)
922 fn read_auto_adjustment<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
923 -> adjustment::AutoAdjustment<'tcx>;
924 fn read_cast_kind<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
926 fn read_auto_deref_ref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
927 -> adjustment::AutoDerefRef<'tcx>;
928 fn read_autoref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
929 -> adjustment::AutoRef<'tcx>;
930 fn convert_def_id(&mut self,
935 // Versions of the type reading functions that don't need the full
937 fn read_ty_nodcx(&mut self,
938 tcx: &ty::ctxt<'tcx>, cdata: &cstore::crate_metadata) -> Ty<'tcx>;
939 fn read_tys_nodcx(&mut self,
940 tcx: &ty::ctxt<'tcx>,
941 cdata: &cstore::crate_metadata) -> Vec<Ty<'tcx>>;
942 fn read_substs_nodcx(&mut self, tcx: &ty::ctxt<'tcx>,
943 cdata: &cstore::crate_metadata)
944 -> subst::Substs<'tcx>;
947 impl<'a, 'tcx> rbml_decoder_decoder_helpers<'tcx> for reader::Decoder<'a> {
948 fn read_ty_nodcx(&mut self,
949 tcx: &ty::ctxt<'tcx>,
950 cdata: &cstore::crate_metadata)
952 self.read_opaque(|_, doc| {
954 tydecode::TyDecoder::with_doc(tcx, cdata.cnum, doc,
955 &mut |id| decoder::translate_def_id(cdata, id))
960 fn read_tys_nodcx(&mut self,
961 tcx: &ty::ctxt<'tcx>,
962 cdata: &cstore::crate_metadata) -> Vec<Ty<'tcx>> {
963 self.read_to_vec(|this| Ok(this.read_ty_nodcx(tcx, cdata)) )
969 fn read_substs_nodcx(&mut self,
970 tcx: &ty::ctxt<'tcx>,
971 cdata: &cstore::crate_metadata)
972 -> subst::Substs<'tcx>
974 self.read_opaque(|_, doc| {
976 tydecode::TyDecoder::with_doc(tcx, cdata.cnum, doc,
977 &mut |id| decoder::translate_def_id(cdata, id))
982 fn read_ty_encoded<'b, 'c, F, R>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>, op: F) -> R
983 where F: for<'x> FnOnce(&mut tydecode::TyDecoder<'x,'tcx>) -> R
985 return self.read_opaque(|this, doc| {
986 debug!("read_ty_encoded({})", type_string(doc));
988 &mut tydecode::TyDecoder::with_doc(
989 dcx.tcx, dcx.cdata.cnum, doc,
990 &mut |a| this.convert_def_id(dcx, a))))
993 fn type_string(doc: rbml::Doc) -> String {
994 let mut str = String::new();
995 for i in doc.start..doc.end {
996 str.push(doc.data[i] as char);
1001 fn read_region(&mut self, dcx: &DecodeContext) -> ty::Region {
1002 // Note: regions types embed local node ids. In principle, we
1003 // should translate these node ids into the new decode
1004 // context. However, we do not bother, because region types
1005 // are not used during trans. This also applies to read_ty.
1006 return self.read_ty_encoded(dcx, |decoder| decoder.parse_region());
1008 fn read_ty<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>) -> Ty<'tcx> {
1009 return self.read_ty_encoded(dcx, |decoder| decoder.parse_ty());
1012 fn read_tys<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1014 self.read_to_vec(|this| Ok(this.read_ty(dcx))).unwrap().into_iter().collect()
1017 fn read_trait_ref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1018 -> ty::TraitRef<'tcx> {
1019 self.read_ty_encoded(dcx, |decoder| decoder.parse_trait_ref())
1022 fn read_poly_trait_ref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1023 -> ty::PolyTraitRef<'tcx> {
1024 ty::Binder(self.read_ty_encoded(dcx, |decoder| decoder.parse_trait_ref()))
1027 fn read_predicate<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1028 -> ty::Predicate<'tcx>
1030 self.read_ty_encoded(dcx, |decoder| decoder.parse_predicate())
1033 fn read_existential_bounds<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1034 -> ty::ExistentialBounds<'tcx>
1036 self.read_ty_encoded(dcx, |decoder| decoder.parse_existential_bounds())
1039 fn read_substs<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1040 -> subst::Substs<'tcx> {
1041 self.read_opaque(|this, doc| {
1042 Ok(tydecode::TyDecoder::with_doc(dcx.tcx, dcx.cdata.cnum, doc,
1043 &mut |a| this.convert_def_id(dcx, a))
1047 fn read_upvar_capture(&mut self, dcx: &DecodeContext) -> ty::UpvarCapture {
1048 self.read_enum("UpvarCapture", |this| {
1049 let variants = ["ByValue", "ByRef"];
1050 this.read_enum_variant(&variants, |this, i| {
1052 1 => ty::UpvarCapture::ByValue,
1053 2 => ty::UpvarCapture::ByRef(ty::UpvarBorrow {
1054 kind: this.read_enum_variant_arg(0,
1055 |this| Decodable::decode(this)).unwrap(),
1056 region: this.read_enum_variant_arg(1,
1057 |this| Ok(this.read_region(dcx))).unwrap()
1059 _ => panic!("bad enum variant for ty::UpvarCapture")
1064 fn read_auto_adjustment<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1065 -> adjustment::AutoAdjustment<'tcx> {
1066 self.read_enum("AutoAdjustment", |this| {
1067 let variants = ["AdjustReifyFnPointer", "AdjustUnsafeFnPointer", "AdjustDerefRef"];
1068 this.read_enum_variant(&variants, |this, i| {
1070 1 => adjustment::AdjustReifyFnPointer,
1071 2 => adjustment::AdjustUnsafeFnPointer,
1073 let auto_deref_ref: adjustment::AutoDerefRef =
1074 this.read_enum_variant_arg(0,
1075 |this| Ok(this.read_auto_deref_ref(dcx))).unwrap();
1077 adjustment::AdjustDerefRef(auto_deref_ref)
1079 _ => panic!("bad enum variant for adjustment::AutoAdjustment")
1085 fn read_auto_deref_ref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1086 -> adjustment::AutoDerefRef<'tcx> {
1087 self.read_struct("AutoDerefRef", 2, |this| {
1088 Ok(adjustment::AutoDerefRef {
1089 autoderefs: this.read_struct_field("autoderefs", 0, |this| {
1090 Decodable::decode(this)
1092 autoref: this.read_struct_field("autoref", 1, |this| {
1093 this.read_option(|this, b| {
1095 Ok(Some(this.read_autoref(dcx)))
1101 unsize: this.read_struct_field("unsize", 2, |this| {
1102 this.read_option(|this, b| {
1104 Ok(Some(this.read_ty(dcx)))
1114 fn read_autoref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
1115 -> adjustment::AutoRef<'tcx> {
1116 self.read_enum("AutoRef", |this| {
1117 let variants = ["AutoPtr", "AutoUnsafe"];
1118 this.read_enum_variant(&variants, |this, i| {
1122 this.read_enum_variant_arg(0, |this| {
1123 Ok(this.read_region(dcx))
1125 let m: hir::Mutability =
1126 this.read_enum_variant_arg(1, |this| {
1127 Decodable::decode(this)
1130 adjustment::AutoPtr(dcx.tcx.mk_region(r), m)
1133 let m: hir::Mutability =
1134 this.read_enum_variant_arg(0, |this| Decodable::decode(this)).unwrap();
1136 adjustment::AutoUnsafe(m)
1138 _ => panic!("bad enum variant for adjustment::AutoRef")
1144 fn read_cast_kind<'b, 'c>(&mut self, _dcx: &DecodeContext<'b, 'c, 'tcx>)
1147 Decodable::decode(self).unwrap()
1150 /// Converts a def-id that appears in a type. The correct
1151 /// translation will depend on what kind of def-id this is.
1152 /// This is a subtle point: type definitions are not
1153 /// inlined into the current crate, so if the def-id names
1154 /// a nominal type or type alias, then it should be
1155 /// translated to refer to the source crate.
1157 /// However, *type parameters* are cloned along with the function
1158 /// they are attached to. So we should translate those def-ids
1159 /// to refer to the new, cloned copy of the type parameter.
1160 /// We only see references to free type parameters in the body of
1161 /// an inlined function. In such cases, we need the def-id to
1162 /// be a local id so that the TypeContents code is able to lookup
1163 /// the relevant info in the ty_param_defs table.
1165 /// *Region parameters*, unfortunately, are another kettle of fish.
1166 /// In such cases, def_id's can appear in types to distinguish
1167 /// shadowed bound regions and so forth. It doesn't actually
1168 /// matter so much what we do to these, since regions are erased
1169 /// at trans time, but it's good to keep them consistent just in
1170 /// case. We translate them with `tr_def_id()` which will map
1171 /// the crate numbers back to the original source crate.
1173 /// Scopes will end up as being totally bogus. This can actually
1174 /// be fixed though.
1176 /// Unboxed closures are cloned along with the function being
1177 /// inlined, and all side tables use interned node IDs, so we
1178 /// translate their def IDs accordingly.
1180 /// It'd be really nice to refactor the type repr to not include
1181 /// def-ids so that all these distinctions were unnecessary.
1182 fn convert_def_id(&mut self,
1183 dcx: &DecodeContext,
1186 let r = dcx.tr_def_id(did);
1187 debug!("convert_def_id(did={:?})={:?}", did, r);
1192 fn decode_side_tables(dcx: &DecodeContext,
1193 ast_doc: rbml::Doc) {
1194 let tbl_doc = ast_doc.get(c::tag_table as usize);
1195 for (tag, entry_doc) in reader::docs(tbl_doc) {
1196 let mut entry_dsr = reader::Decoder::new(entry_doc);
1197 let id0: ast::NodeId = Decodable::decode(&mut entry_dsr).unwrap();
1198 let id = dcx.tr_id(id0);
1200 debug!(">> Side table document with tag 0x{:x} \
1201 found for id {} (orig {})",
1203 let tag = tag as u32;
1204 let decoded_tag: Option<c::astencode_tag> = c::astencode_tag::from_u32(tag);
1208 &format!("unknown tag found in side tables: {:x}",
1212 let val_dsr = &mut entry_dsr;
1215 c::tag_table_def => {
1216 let def = decode_def(dcx, val_dsr);
1217 dcx.tcx.def_map.borrow_mut().insert(id, def::PathResolution {
1219 // This doesn't matter cross-crate.
1220 last_private: LastMod(AllPublic),
1224 c::tag_table_node_type => {
1225 let ty = val_dsr.read_ty(dcx);
1226 debug!("inserting ty for node {}: {:?}",
1228 dcx.tcx.node_type_insert(id, ty);
1230 c::tag_table_item_subst => {
1231 let item_substs = ty::ItemSubsts {
1232 substs: val_dsr.read_substs(dcx)
1234 dcx.tcx.tables.borrow_mut().item_substs.insert(
1237 c::tag_table_freevars => {
1238 let fv_info = val_dsr.read_to_vec(|val_dsr| {
1239 Ok(val_dsr.read_freevar_entry(dcx))
1240 }).unwrap().into_iter().collect();
1241 dcx.tcx.freevars.borrow_mut().insert(id, fv_info);
1243 c::tag_table_upvar_capture_map => {
1244 let var_id: ast::NodeId = Decodable::decode(val_dsr).unwrap();
1245 let upvar_id = ty::UpvarId {
1246 var_id: dcx.tr_id(var_id),
1249 let ub = val_dsr.read_upvar_capture(dcx);
1250 dcx.tcx.tables.borrow_mut().upvar_capture_map.insert(upvar_id, ub);
1252 c::tag_table_method_map => {
1253 let (autoderef, method) = val_dsr.read_method_callee(dcx);
1254 let method_call = ty::MethodCall {
1256 autoderef: autoderef
1258 dcx.tcx.tables.borrow_mut().method_map.insert(method_call, method);
1260 c::tag_table_adjustments => {
1262 val_dsr.read_auto_adjustment(dcx);
1263 dcx.tcx.tables.borrow_mut().adjustments.insert(id, adj);
1265 c::tag_table_cast_kinds => {
1267 val_dsr.read_cast_kind(dcx);
1268 dcx.tcx.cast_kinds.borrow_mut().insert(id, cast_kind);
1270 c::tag_table_const_qualif => {
1271 let qualif: ConstQualif = Decodable::decode(val_dsr).unwrap();
1272 dcx.tcx.const_qualif_map.borrow_mut().insert(id, qualif);
1276 &format!("unknown tag found in side tables: {:x}",
1283 debug!(">< Side table doc loaded");
1287 // copy the tcache entries from the original item to the new
1289 fn copy_item_types(dcx: &DecodeContext, ii: &InlinedItem, orig_did: DefId) {
1290 fn copy_item_type(dcx: &DecodeContext,
1291 inlined_id: ast::NodeId,
1292 remote_did: DefId) {
1293 let inlined_did = dcx.tcx.map.local_def_id(inlined_id);
1294 dcx.tcx.register_item_type(inlined_did,
1295 dcx.tcx.lookup_item_type(remote_did));
1298 // copy the entry for the item itself
1299 let item_node_id = match ii {
1300 &InlinedItem::Item(ref i) => i.id,
1301 &InlinedItem::TraitItem(_, ref ti) => ti.id,
1302 &InlinedItem::ImplItem(_, ref ii) => ii.id,
1303 &InlinedItem::Foreign(ref fi) => fi.id
1305 copy_item_type(dcx, item_node_id, orig_did);
1307 // copy the entries of inner items
1308 if let &InlinedItem::Item(ref item) = ii {
1310 hir::ItemEnum(ref def, _) => {
1311 let orig_def = dcx.tcx.lookup_adt_def(orig_did);
1312 for (i_variant, orig_variant) in
1313 def.variants.iter().zip(orig_def.variants.iter())
1315 copy_item_type(dcx, i_variant.node.id, orig_variant.did);
1318 hir::ItemStruct(ref def, _) => {
1319 if let Some(ctor_id) = def.ctor_id {
1320 let ctor_did = dcx.tcx.lookup_adt_def(orig_did)
1321 .struct_variant().ctor_id;
1322 debug!("copying ctor {:?}", ctor_did);
1323 copy_item_type(dcx, ctor_id, ctor_did);
1331 // ______________________________________________________________________
1332 // Testing of astencode_gen
1335 fn encode_item_ast(rbml_w: &mut Encoder, item: &hir::Item) {
1336 rbml_w.start_tag(c::tag_tree as usize);
1337 (*item).encode(rbml_w);
1342 fn decode_item_ast(par_doc: rbml::Doc) -> hir::Item {
1343 let chi_doc = par_doc.get(c::tag_tree as usize);
1344 let mut d = reader::Decoder::new(chi_doc);
1345 Decodable::decode(&mut d).unwrap()
1350 fn call_site(&self) -> codemap::Span;
1351 fn cfg(&self) -> ast::CrateConfig;
1352 fn ident_of(&self, st: &str) -> ast::Ident;
1353 fn name_of(&self, st: &str) -> ast::Name;
1354 fn parse_sess(&self) -> &parse::ParseSess;
1358 impl FakeExtCtxt for parse::ParseSess {
1359 fn call_site(&self) -> codemap::Span {
1361 lo: codemap::BytePos(0),
1362 hi: codemap::BytePos(0),
1363 expn_id: codemap::NO_EXPANSION,
1366 fn cfg(&self) -> ast::CrateConfig { Vec::new() }
1367 fn ident_of(&self, st: &str) -> ast::Ident {
1368 parse::token::str_to_ident(st)
1370 fn name_of(&self, st: &str) -> ast::Name {
1371 parse::token::intern(st)
1373 fn parse_sess(&self) -> &parse::ParseSess { self }
1377 fn mk_ctxt() -> parse::ParseSess {
1378 parse::ParseSess::new()
1382 fn roundtrip(in_item: P<hir::Item>) {
1383 let mut wr = Cursor::new(Vec::new());
1384 encode_item_ast(&mut Encoder::new(&mut wr), &*in_item);
1385 let rbml_doc = rbml::Doc::new(wr.get_ref());
1386 let out_item = decode_item_ast(rbml_doc);
1388 assert!(*in_item == out_item);
1394 roundtrip(lower_item("e_item!(&cx,
1400 fn test_smalltalk() {
1402 roundtrip(lower_item("e_item!(&cx,
1403 fn foo() -> isize { 3 + 4 } // first smalltalk program ever executed.
1410 roundtrip(lower_item("e_item!(&cx,
1411 fn foo(x: usize, y: usize) -> usize {
1419 fn test_simplification() {
1421 let item = quote_item!(&cx,
1422 fn new_int_alist<B>() -> alist<isize, B> {
1423 fn eq_int(a: isize, b: isize) -> bool { a == b }
1424 return alist {eq_fn: eq_int, data: Vec::new()};
1427 let hir_item = lower_item(&item);
1428 let item_in = InlinedItemRef::Item(&hir_item);
1429 let item_out = simplify_ast(item_in);
1430 let item_exp = InlinedItem::Item(lower_item("e_item!(&cx,
1431 fn new_int_alist<B>() -> alist<isize, B> {
1432 return alist {eq_fn: eq_int, data: Vec::new()};
1435 match (item_out, item_exp) {
1436 (InlinedItem::Item(item_out), InlinedItem::Item(item_exp)) => {
1437 assert!(pprust::item_to_string(&*item_out) ==
1438 pprust::item_to_string(&*item_exp));