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rust/src/librustc/middle/astencode.rs
Jorge Aparicio 517f1cc63c use slicing sugar
2015-01-07 17:35:56 -05:00

2087 lines
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// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![allow(non_camel_case_types)]
// FIXME: remove this after snapshot, and Results are handled
#![allow(unused_must_use)]
use metadata::common as c;
use metadata::cstore as cstore;
use session::Session;
use metadata::decoder;
use middle::def;
use metadata::encoder as e;
use middle::region;
use metadata::tydecode;
use metadata::tydecode::{DefIdSource, NominalType, TypeWithId, TypeParameter};
use metadata::tydecode::{RegionParameter, UnboxedClosureSource};
use metadata::tyencode;
use middle::mem_categorization::Typer;
use middle::subst;
use middle::subst::VecPerParamSpace;
use middle::ty::{self, Ty, MethodCall, MethodCallee, MethodOrigin};
use util::ppaux::ty_to_string;
use syntax::{ast, ast_map, ast_util, codemap, fold};
use syntax::ast_util::PostExpansionMethod;
use syntax::codemap::Span;
use syntax::fold::Folder;
use syntax::parse::token;
use syntax::ptr::P;
use syntax;
use std::io::Seek;
use std::rc::Rc;
use rbml::io::SeekableMemWriter;
use rbml::{reader, writer};
use rbml;
use serialize;
use serialize::{Decodable, Decoder, DecoderHelpers, Encodable};
use serialize::{EncoderHelpers};
#[cfg(test)] use syntax::parse;
#[cfg(test)] use syntax::print::pprust;
struct DecodeContext<'a, 'b, 'tcx: 'a> {
tcx: &'a ty::ctxt<'tcx>,
cdata: &'b cstore::crate_metadata,
from_id_range: ast_util::IdRange,
to_id_range: ast_util::IdRange
}
trait tr {
fn tr(&self, dcx: &DecodeContext) -> Self;
}
trait tr_intern {
fn tr_intern(&self, dcx: &DecodeContext) -> ast::DefId;
}
pub type Encoder<'a> = writer::Encoder<'a, SeekableMemWriter>;
// ______________________________________________________________________
// Top-level methods.
pub fn encode_inlined_item(ecx: &e::EncodeContext,
rbml_w: &mut Encoder,
ii: e::InlinedItemRef) {
let id = match ii {
e::IIItemRef(i) => i.id,
e::IIForeignRef(i) => i.id,
e::IITraitItemRef(_, &ast::ProvidedMethod(ref m)) => m.id,
e::IITraitItemRef(_, &ast::RequiredMethod(ref m)) => m.id,
e::IITraitItemRef(_, &ast::TypeTraitItem(ref ti)) => ti.ty_param.id,
e::IIImplItemRef(_, &ast::MethodImplItem(ref m)) => m.id,
e::IIImplItemRef(_, &ast::TypeImplItem(ref ti)) => ti.id,
};
debug!("> Encoding inlined item: {} ({:?})",
ecx.tcx.map.path_to_string(id),
rbml_w.writer.tell());
// Folding could be avoided with a smarter encoder.
let ii = simplify_ast(ii);
let id_range = ast_util::compute_id_range_for_inlined_item(&ii);
rbml_w.start_tag(c::tag_ast as uint);
id_range.encode(rbml_w);
encode_ast(rbml_w, &ii);
encode_side_tables_for_ii(ecx, rbml_w, &ii);
rbml_w.end_tag();
debug!("< Encoded inlined fn: {} ({:?})",
ecx.tcx.map.path_to_string(id),
rbml_w.writer.tell());
}
impl<'a, 'b, 'c, 'tcx> ast_map::FoldOps for &'a DecodeContext<'b, 'c, 'tcx> {
fn new_id(&self, id: ast::NodeId) -> ast::NodeId {
if id == ast::DUMMY_NODE_ID {
// Used by ast_map to map the NodeInlinedParent.
self.tcx.sess.next_node_id()
} else {
self.tr_id(id)
}
}
fn new_def_id(&self, def_id: ast::DefId) -> ast::DefId {
self.tr_def_id(def_id)
}
fn new_span(&self, span: Span) -> Span {
self.tr_span(span)
}
}
pub fn decode_inlined_item<'tcx>(cdata: &cstore::crate_metadata,
tcx: &ty::ctxt<'tcx>,
path: Vec<ast_map::PathElem>,
par_doc: rbml::Doc)
-> Result<&'tcx ast::InlinedItem, Vec<ast_map::PathElem>> {
match par_doc.opt_child(c::tag_ast) {
None => Err(path),
Some(ast_doc) => {
let mut path_as_str = None;
debug!("> Decoding inlined fn: {:?}::?",
{
// Do an Option dance to use the path after it is moved below.
let s = ast_map::path_to_string(ast_map::Values(path.iter()));
path_as_str = Some(s);
path_as_str.as_ref().map(|x| &x[])
});
let mut ast_dsr = reader::Decoder::new(ast_doc);
let from_id_range = Decodable::decode(&mut ast_dsr).unwrap();
let to_id_range = reserve_id_range(&tcx.sess, from_id_range);
let dcx = &DecodeContext {
cdata: cdata,
tcx: tcx,
from_id_range: from_id_range,
to_id_range: to_id_range
};
let raw_ii = decode_ast(ast_doc);
let ii = ast_map::map_decoded_item(&dcx.tcx.map, path, raw_ii, dcx);
let ident = match *ii {
ast::IIItem(ref i) => i.ident,
ast::IIForeign(ref i) => i.ident,
ast::IITraitItem(_, ref ti) => {
match *ti {
ast::ProvidedMethod(ref m) => m.pe_ident(),
ast::RequiredMethod(ref ty_m) => ty_m.ident,
ast::TypeTraitItem(ref ti) => ti.ty_param.ident,
}
},
ast::IIImplItem(_, ref m) => {
match *m {
ast::MethodImplItem(ref m) => m.pe_ident(),
ast::TypeImplItem(ref ti) => ti.ident,
}
}
};
debug!("Fn named: {}", token::get_ident(ident));
debug!("< Decoded inlined fn: {}::{}",
path_as_str.unwrap(),
token::get_ident(ident));
region::resolve_inlined_item(&tcx.sess, &tcx.region_maps, ii);
decode_side_tables(dcx, ast_doc);
match *ii {
ast::IIItem(ref i) => {
debug!(">>> DECODED ITEM >>>\n{}\n<<< DECODED ITEM <<<",
syntax::print::pprust::item_to_string(&**i));
}
_ => { }
}
Ok(ii)
}
}
}
// ______________________________________________________________________
// Enumerating the IDs which appear in an AST
fn reserve_id_range(sess: &Session,
from_id_range: ast_util::IdRange) -> ast_util::IdRange {
// Handle the case of an empty range:
if from_id_range.empty() { return from_id_range; }
let cnt = from_id_range.max - from_id_range.min;
let to_id_min = sess.reserve_node_ids(cnt);
let to_id_max = to_id_min + cnt;
ast_util::IdRange { min: to_id_min, max: to_id_max }
}
impl<'a, 'b, 'tcx> DecodeContext<'a, 'b, 'tcx> {
/// Translates an internal id, meaning a node id that is known to refer to some part of the
/// item currently being inlined, such as a local variable or argument. All naked node-ids
/// that appear in types have this property, since if something might refer to an external item
/// we would use a def-id to allow for the possibility that the item resides in another crate.
pub fn tr_id(&self, id: ast::NodeId) -> ast::NodeId {
// from_id_range should be non-empty
assert!(!self.from_id_range.empty());
(id - self.from_id_range.min + self.to_id_range.min)
}
/// Translates an EXTERNAL def-id, converting the crate number from the one used in the encoded
/// data to the current crate numbers.. By external, I mean that it be translated to a
/// reference to the item in its original crate, as opposed to being translated to a reference
/// to the inlined version of the item. This is typically, but not always, what you want,
/// because most def-ids refer to external things like types or other fns that may or may not
/// be inlined. Note that even when the inlined function is referencing itself recursively, we
/// would want `tr_def_id` for that reference--- conceptually the function calls the original,
/// non-inlined version, and trans deals with linking that recursive call to the inlined copy.
///
/// However, there are a *few* cases where def-ids are used but we know that the thing being
/// referenced is in fact *internal* to the item being inlined. In those cases, you should use
/// `tr_intern_def_id()` below.
pub fn tr_def_id(&self, did: ast::DefId) -> ast::DefId {
decoder::translate_def_id(self.cdata, did)
}
/// Translates an INTERNAL def-id, meaning a def-id that is
/// known to refer to some part of the item currently being
/// inlined. In that case, we want to convert the def-id to
/// refer to the current crate and to the new, inlined node-id.
pub fn tr_intern_def_id(&self, did: ast::DefId) -> ast::DefId {
assert_eq!(did.krate, ast::LOCAL_CRATE);
ast::DefId { krate: ast::LOCAL_CRATE, node: self.tr_id(did.node) }
}
pub fn tr_span(&self, _span: Span) -> Span {
codemap::DUMMY_SP // FIXME (#1972): handle span properly
}
}
impl tr_intern for ast::DefId {
fn tr_intern(&self, dcx: &DecodeContext) -> ast::DefId {
dcx.tr_intern_def_id(*self)
}
}
impl tr for ast::DefId {
fn tr(&self, dcx: &DecodeContext) -> ast::DefId {
dcx.tr_def_id(*self)
}
}
impl tr for Option<ast::DefId> {
fn tr(&self, dcx: &DecodeContext) -> Option<ast::DefId> {
self.map(|d| dcx.tr_def_id(d))
}
}
impl tr for Span {
fn tr(&self, dcx: &DecodeContext) -> Span {
dcx.tr_span(*self)
}
}
trait def_id_encoder_helpers {
fn emit_def_id(&mut self, did: ast::DefId);
}
impl<S:serialize::Encoder> def_id_encoder_helpers for S {
fn emit_def_id(&mut self, did: ast::DefId) {
did.encode(self).ok().unwrap()
}
}
trait def_id_decoder_helpers {
fn read_def_id(&mut self, dcx: &DecodeContext) -> ast::DefId;
fn read_def_id_nodcx(&mut self,
cdata: &cstore::crate_metadata) -> ast::DefId;
}
impl<D:serialize::Decoder> def_id_decoder_helpers for D {
fn read_def_id(&mut self, dcx: &DecodeContext) -> ast::DefId {
let did: ast::DefId = Decodable::decode(self).ok().unwrap();
did.tr(dcx)
}
fn read_def_id_nodcx(&mut self,
cdata: &cstore::crate_metadata) -> ast::DefId {
let did: ast::DefId = Decodable::decode(self).ok().unwrap();
decoder::translate_def_id(cdata, did)
}
}
// ______________________________________________________________________
// Encoding and decoding the AST itself
//
// The hard work is done by an autogenerated module astencode_gen. To
// regenerate astencode_gen, run src/etc/gen-astencode. It will
// replace astencode_gen with a dummy file and regenerate its
// contents. If you get compile errors, the dummy file
// remains---resolve the errors and then rerun astencode_gen.
// Annoying, I know, but hopefully only temporary.
//
// When decoding, we have to renumber the AST so that the node ids that
// appear within are disjoint from the node ids in our existing ASTs.
// We also have to adjust the spans: for now we just insert a dummy span,
// but eventually we should add entries to the local codemap as required.
fn encode_ast(rbml_w: &mut Encoder, item: &ast::InlinedItem) {
rbml_w.start_tag(c::tag_tree as uint);
item.encode(rbml_w);
rbml_w.end_tag();
}
struct NestedItemsDropper;
impl Folder for NestedItemsDropper {
fn fold_block(&mut self, blk: P<ast::Block>) -> P<ast::Block> {
blk.and_then(|ast::Block {id, stmts, expr, rules, span, ..}| {
let stmts_sans_items = stmts.into_iter().filter_map(|stmt| {
let use_stmt = match stmt.node {
ast::StmtExpr(_, _) | ast::StmtSemi(_, _) => true,
ast::StmtDecl(ref decl, _) => {
match decl.node {
ast::DeclLocal(_) => true,
ast::DeclItem(_) => false,
}
}
ast::StmtMac(..) => panic!("unexpanded macro in astencode")
};
if use_stmt {
Some(stmt)
} else {
None
}
}).collect();
let blk_sans_items = P(ast::Block {
view_items: Vec::new(), // I don't know if we need the view_items
// here, but it doesn't break tests!
stmts: stmts_sans_items,
expr: expr,
id: id,
rules: rules,
span: span,
});
fold::noop_fold_block(blk_sans_items, self)
})
}
}
// Produces a simplified copy of the AST which does not include things
// that we do not need to or do not want to export. For example, we
// do not include any nested items: if these nested items are to be
// inlined, their AST will be exported separately (this only makes
// sense because, in Rust, nested items are independent except for
// their visibility).
//
// As it happens, trans relies on the fact that we do not export
// nested items, as otherwise it would get confused when translating
// inlined items.
fn simplify_ast(ii: e::InlinedItemRef) -> ast::InlinedItem {
let mut fld = NestedItemsDropper;
match ii {
// HACK we're not dropping items.
e::IIItemRef(i) => {
ast::IIItem(fold::noop_fold_item(P(i.clone()), &mut fld)
.expect_one("expected one item"))
}
e::IITraitItemRef(d, ti) => {
ast::IITraitItem(d, match *ti {
ast::ProvidedMethod(ref m) => {
ast::ProvidedMethod(
fold::noop_fold_method(m.clone(), &mut fld)
.expect_one("noop_fold_method must produce \
exactly one method"))
}
ast::RequiredMethod(ref ty_m) => {
ast::RequiredMethod(
fold::noop_fold_type_method(ty_m.clone(), &mut fld))
}
ast::TypeTraitItem(ref associated_type) => {
ast::TypeTraitItem(
P(fold::noop_fold_associated_type(
(**associated_type).clone(),
&mut fld)))
}
})
}
e::IIImplItemRef(d, m) => {
ast::IIImplItem(d, match *m {
ast::MethodImplItem(ref m) => {
ast::MethodImplItem(
fold::noop_fold_method(m.clone(), &mut fld)
.expect_one("noop_fold_method must produce \
exactly one method"))
}
ast::TypeImplItem(ref td) => {
ast::TypeImplItem(
P(fold::noop_fold_typedef((**td).clone(), &mut fld)))
}
})
}
e::IIForeignRef(i) => {
ast::IIForeign(fold::noop_fold_foreign_item(P(i.clone()), &mut fld))
}
}
}
fn decode_ast(par_doc: rbml::Doc) -> ast::InlinedItem {
let chi_doc = par_doc.get(c::tag_tree as uint);
let mut d = reader::Decoder::new(chi_doc);
Decodable::decode(&mut d).unwrap()
}
// ______________________________________________________________________
// Encoding and decoding of ast::def
fn decode_def(dcx: &DecodeContext, doc: rbml::Doc) -> def::Def {
let mut dsr = reader::Decoder::new(doc);
let def: def::Def = Decodable::decode(&mut dsr).unwrap();
def.tr(dcx)
}
impl tr for def::Def {
fn tr(&self, dcx: &DecodeContext) -> def::Def {
match *self {
def::DefFn(did, is_ctor) => def::DefFn(did.tr(dcx), is_ctor),
def::DefStaticMethod(did, p) => {
def::DefStaticMethod(did.tr(dcx), p.map(|did2| did2.tr(dcx)))
}
def::DefMethod(did0, did1, p) => {
def::DefMethod(did0.tr(dcx),
did1.map(|did1| did1.tr(dcx)),
p.map(|did2| did2.tr(dcx)))
}
def::DefSelfTy(nid) => { def::DefSelfTy(dcx.tr_id(nid)) }
def::DefMod(did) => { def::DefMod(did.tr(dcx)) }
def::DefForeignMod(did) => { def::DefForeignMod(did.tr(dcx)) }
def::DefStatic(did, m) => { def::DefStatic(did.tr(dcx), m) }
def::DefConst(did) => { def::DefConst(did.tr(dcx)) }
def::DefLocal(nid) => { def::DefLocal(dcx.tr_id(nid)) }
def::DefVariant(e_did, v_did, is_s) => {
def::DefVariant(e_did.tr(dcx), v_did.tr(dcx), is_s)
},
def::DefTrait(did) => def::DefTrait(did.tr(dcx)),
def::DefTy(did, is_enum) => def::DefTy(did.tr(dcx), is_enum),
def::DefAssociatedTy(did) => def::DefAssociatedTy(did.tr(dcx)),
def::DefAssociatedPath(def::TyParamProvenance::FromSelf(did), ident) =>
def::DefAssociatedPath(def::TyParamProvenance::FromSelf(did.tr(dcx)), ident),
def::DefAssociatedPath(def::TyParamProvenance::FromParam(did), ident) =>
def::DefAssociatedPath(def::TyParamProvenance::FromParam(did.tr(dcx)), ident),
def::DefPrimTy(p) => def::DefPrimTy(p),
def::DefTyParam(s, index, def_id, n) => def::DefTyParam(s, index, def_id.tr(dcx), n),
def::DefUse(did) => def::DefUse(did.tr(dcx)),
def::DefUpvar(nid1, nid2, nid3) => {
def::DefUpvar(dcx.tr_id(nid1),
dcx.tr_id(nid2),
dcx.tr_id(nid3))
}
def::DefStruct(did) => def::DefStruct(did.tr(dcx)),
def::DefRegion(nid) => def::DefRegion(dcx.tr_id(nid)),
def::DefTyParamBinder(nid) => {
def::DefTyParamBinder(dcx.tr_id(nid))
}
def::DefLabel(nid) => def::DefLabel(dcx.tr_id(nid))
}
}
}
// ______________________________________________________________________
// Encoding and decoding of ancillary information
impl tr for ty::Region {
fn tr(&self, dcx: &DecodeContext) -> ty::Region {
match *self {
ty::ReLateBound(debruijn, br) => {
ty::ReLateBound(debruijn, br.tr(dcx))
}
ty::ReEarlyBound(id, space, index, ident) => {
ty::ReEarlyBound(dcx.tr_id(id), space, index, ident)
}
ty::ReScope(scope) => {
ty::ReScope(scope.tr(dcx))
}
ty::ReEmpty | ty::ReStatic | ty::ReInfer(..) => {
*self
}
ty::ReFree(ref fr) => {
ty::ReFree(fr.tr(dcx))
}
}
}
}
impl tr for ty::FreeRegion {
fn tr(&self, dcx: &DecodeContext) -> ty::FreeRegion {
ty::FreeRegion { scope: self.scope.tr(dcx),
bound_region: self.bound_region.tr(dcx) }
}
}
impl tr for region::CodeExtent {
fn tr(&self, dcx: &DecodeContext) -> region::CodeExtent {
self.map_id(|id| dcx.tr_id(id))
}
}
impl tr for ty::BoundRegion {
fn tr(&self, dcx: &DecodeContext) -> ty::BoundRegion {
match *self {
ty::BrAnon(_) |
ty::BrFresh(_) |
ty::BrEnv => *self,
ty::BrNamed(id, ident) => ty::BrNamed(dcx.tr_def_id(id),
ident),
}
}
}
impl tr for ty::TraitStore {
fn tr(&self, dcx: &DecodeContext) -> ty::TraitStore {
match *self {
ty::RegionTraitStore(r, m) => {
ty::RegionTraitStore(r.tr(dcx), m)
}
ty::UniqTraitStore => ty::UniqTraitStore
}
}
}
// ______________________________________________________________________
// Encoding and decoding of freevar information
fn encode_freevar_entry(rbml_w: &mut Encoder, fv: &ty::Freevar) {
(*fv).encode(rbml_w).unwrap();
}
fn encode_capture_mode(rbml_w: &mut Encoder, cm: ast::CaptureClause) {
cm.encode(rbml_w).unwrap();
}
trait rbml_decoder_helper {
fn read_freevar_entry(&mut self, dcx: &DecodeContext)
-> ty::Freevar;
fn read_capture_mode(&mut self) -> ast::CaptureClause;
}
impl<'a> rbml_decoder_helper for reader::Decoder<'a> {
fn read_freevar_entry(&mut self, dcx: &DecodeContext)
-> ty::Freevar {
let fv: ty::Freevar = Decodable::decode(self).unwrap();
fv.tr(dcx)
}
fn read_capture_mode(&mut self) -> ast::CaptureClause {
let cm: ast::CaptureClause = Decodable::decode(self).unwrap();
cm
}
}
impl tr for ty::Freevar {
fn tr(&self, dcx: &DecodeContext) -> ty::Freevar {
ty::Freevar {
def: self.def.tr(dcx),
span: self.span.tr(dcx),
}
}
}
impl tr for ty::UpvarBorrow {
fn tr(&self, dcx: &DecodeContext) -> ty::UpvarBorrow {
ty::UpvarBorrow {
kind: self.kind,
region: self.region.tr(dcx)
}
}
}
// ______________________________________________________________________
// Encoding and decoding of MethodCallee
trait read_method_callee_helper<'tcx> {
fn read_method_callee<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> (ty::ExprAdjustment, MethodCallee<'tcx>);
}
fn encode_method_callee<'a, 'tcx>(ecx: &e::EncodeContext<'a, 'tcx>,
rbml_w: &mut Encoder,
adjustment: ty::ExprAdjustment,
method: &MethodCallee<'tcx>) {
use serialize::Encoder;
rbml_w.emit_struct("MethodCallee", 4, |rbml_w| {
rbml_w.emit_struct_field("adjustment", 0u, |rbml_w| {
adjustment.encode(rbml_w)
});
rbml_w.emit_struct_field("origin", 1u, |rbml_w| {
Ok(rbml_w.emit_method_origin(ecx, &method.origin))
});
rbml_w.emit_struct_field("ty", 2u, |rbml_w| {
Ok(rbml_w.emit_ty(ecx, method.ty))
});
rbml_w.emit_struct_field("substs", 3u, |rbml_w| {
Ok(rbml_w.emit_substs(ecx, &method.substs))
})
}).unwrap();
}
impl<'a, 'tcx> read_method_callee_helper<'tcx> for reader::Decoder<'a> {
fn read_method_callee<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> (ty::ExprAdjustment, MethodCallee<'tcx>) {
self.read_struct("MethodCallee", 4, |this| {
let adjustment = this.read_struct_field("adjustment", 0, |this| {
Decodable::decode(this)
}).unwrap();
Ok((adjustment, MethodCallee {
origin: this.read_struct_field("origin", 1, |this| {
Ok(this.read_method_origin(dcx))
}).unwrap(),
ty: this.read_struct_field("ty", 2, |this| {
Ok(this.read_ty(dcx))
}).unwrap(),
substs: this.read_struct_field("substs", 3, |this| {
Ok(this.read_substs(dcx))
}).unwrap()
}))
}).unwrap()
}
}
impl<'tcx> tr for MethodOrigin<'tcx> {
fn tr(&self, dcx: &DecodeContext) -> MethodOrigin<'tcx> {
match *self {
ty::MethodStatic(did) => ty::MethodStatic(did.tr(dcx)),
ty::MethodStaticUnboxedClosure(did) => {
ty::MethodStaticUnboxedClosure(did.tr(dcx))
}
ty::MethodTypeParam(ref mp) => {
ty::MethodTypeParam(
ty::MethodParam {
// def-id is already translated when we read it out
trait_ref: mp.trait_ref.clone(),
method_num: mp.method_num,
}
)
}
ty::MethodTraitObject(ref mo) => {
ty::MethodTraitObject(
ty::MethodObject {
trait_ref: mo.trait_ref.clone(),
.. *mo
}
)
}
}
}
}
pub fn encode_unboxed_closure_kind(ebml_w: &mut Encoder,
kind: ty::UnboxedClosureKind) {
use serialize::Encoder;
ebml_w.emit_enum("UnboxedClosureKind", |ebml_w| {
match kind {
ty::FnUnboxedClosureKind => {
ebml_w.emit_enum_variant("FnUnboxedClosureKind", 0, 3, |_| {
Ok(())
})
}
ty::FnMutUnboxedClosureKind => {
ebml_w.emit_enum_variant("FnMutUnboxedClosureKind", 1, 3, |_| {
Ok(())
})
}
ty::FnOnceUnboxedClosureKind => {
ebml_w.emit_enum_variant("FnOnceUnboxedClosureKind",
2,
3,
|_| {
Ok(())
})
}
}
}).unwrap()
}
pub trait vtable_decoder_helpers<'tcx> {
fn read_vec_per_param_space<T, F>(&mut self, f: F) -> VecPerParamSpace<T> where
F: FnMut(&mut Self) -> T;
fn read_vtable_res_with_key(&mut self,
tcx: &ty::ctxt<'tcx>,
cdata: &cstore::crate_metadata)
-> (ty::ExprAdjustment, ty::vtable_res<'tcx>);
fn read_vtable_res(&mut self,
tcx: &ty::ctxt<'tcx>, cdata: &cstore::crate_metadata)
-> ty::vtable_res<'tcx>;
fn read_vtable_param_res(&mut self,
tcx: &ty::ctxt<'tcx>, cdata: &cstore::crate_metadata)
-> ty::vtable_param_res<'tcx>;
fn read_vtable_origin(&mut self,
tcx: &ty::ctxt<'tcx>, cdata: &cstore::crate_metadata)
-> ty::vtable_origin<'tcx>;
}
impl<'tcx, 'a> vtable_decoder_helpers<'tcx> for reader::Decoder<'a> {
fn read_vec_per_param_space<T, F>(&mut self, mut f: F) -> VecPerParamSpace<T> where
F: FnMut(&mut reader::Decoder<'a>) -> T,
{
let types = self.read_to_vec(|this| Ok(f(this))).unwrap();
let selfs = self.read_to_vec(|this| Ok(f(this))).unwrap();
let fns = self.read_to_vec(|this| Ok(f(this))).unwrap();
VecPerParamSpace::new(types, selfs, fns)
}
fn read_vtable_res_with_key(&mut self,
tcx: &ty::ctxt<'tcx>,
cdata: &cstore::crate_metadata)
-> (ty::ExprAdjustment, ty::vtable_res<'tcx>) {
self.read_struct("VtableWithKey", 2, |this| {
let adjustment = this.read_struct_field("adjustment", 0, |this| {
Decodable::decode(this)
}).unwrap();
Ok((adjustment, this.read_struct_field("vtable_res", 1, |this| {
Ok(this.read_vtable_res(tcx, cdata))
}).unwrap()))
}).unwrap()
}
fn read_vtable_res(&mut self,
tcx: &ty::ctxt<'tcx>,
cdata: &cstore::crate_metadata)
-> ty::vtable_res<'tcx>
{
self.read_vec_per_param_space(
|this| this.read_vtable_param_res(tcx, cdata))
}
fn read_vtable_param_res(&mut self,
tcx: &ty::ctxt<'tcx>, cdata: &cstore::crate_metadata)
-> ty::vtable_param_res<'tcx> {
self.read_to_vec(|this| Ok(this.read_vtable_origin(tcx, cdata)))
.unwrap().into_iter().collect()
}
fn read_vtable_origin(&mut self,
tcx: &ty::ctxt<'tcx>, cdata: &cstore::crate_metadata)
-> ty::vtable_origin<'tcx> {
self.read_enum("vtable_origin", |this| {
this.read_enum_variant(&["vtable_static",
"vtable_param",
"vtable_error",
"vtable_unboxed_closure"],
|this, i| {
Ok(match i {
0 => {
ty::vtable_static(
this.read_enum_variant_arg(0u, |this| {
Ok(this.read_def_id_nodcx(cdata))
}).unwrap(),
this.read_enum_variant_arg(1u, |this| {
Ok(this.read_substs_nodcx(tcx, cdata))
}).unwrap(),
this.read_enum_variant_arg(2u, |this| {
Ok(this.read_vtable_res(tcx, cdata))
}).unwrap()
)
}
1 => {
ty::vtable_param(
this.read_enum_variant_arg(0u, |this| {
Decodable::decode(this)
}).unwrap(),
this.read_enum_variant_arg(1u, |this| {
this.read_uint()
}).unwrap()
)
}
2 => {
ty::vtable_unboxed_closure(
this.read_enum_variant_arg(0u, |this| {
Ok(this.read_def_id_nodcx(cdata))
}).unwrap()
)
}
3 => {
ty::vtable_error
}
_ => panic!("bad enum variant")
})
})
}).unwrap()
}
}
// ___________________________________________________________________________
//
fn encode_vec_per_param_space<T, F>(rbml_w: &mut Encoder,
v: &subst::VecPerParamSpace<T>,
mut f: F) where
F: FnMut(&mut Encoder, &T),
{
for &space in subst::ParamSpace::all().iter() {
rbml_w.emit_from_vec(v.get_slice(space),
|rbml_w, n| Ok(f(rbml_w, n))).unwrap();
}
}
// ______________________________________________________________________
// Encoding and decoding the side tables
trait get_ty_str_ctxt<'tcx> {
fn ty_str_ctxt<'a>(&'a self) -> tyencode::ctxt<'a, 'tcx>;
}
impl<'a, 'tcx> get_ty_str_ctxt<'tcx> for e::EncodeContext<'a, 'tcx> {
fn ty_str_ctxt<'b>(&'b self) -> tyencode::ctxt<'b, 'tcx> {
tyencode::ctxt {
diag: self.tcx.sess.diagnostic(),
ds: e::def_to_string,
tcx: self.tcx,
abbrevs: &self.type_abbrevs
}
}
}
trait rbml_writer_helpers<'tcx> {
fn emit_closure_type<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
closure_type: &ty::ClosureTy<'tcx>);
fn emit_method_origin<'a>(&mut self,
ecx: &e::EncodeContext<'a, 'tcx>,
method_origin: &ty::MethodOrigin<'tcx>);
fn emit_ty<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>, ty: Ty<'tcx>);
fn emit_tys<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>, tys: &[Ty<'tcx>]);
fn emit_type_param_def<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
type_param_def: &ty::TypeParameterDef<'tcx>);
fn emit_predicate<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
predicate: &ty::Predicate<'tcx>);
fn emit_trait_ref<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
ty: &ty::TraitRef<'tcx>);
fn emit_type_scheme<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
type_scheme: ty::TypeScheme<'tcx>);
fn emit_substs<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
substs: &subst::Substs<'tcx>);
fn emit_existential_bounds<'b>(&mut self, ecx: &e::EncodeContext<'b,'tcx>,
bounds: &ty::ExistentialBounds<'tcx>);
fn emit_builtin_bounds(&mut self, ecx: &e::EncodeContext, bounds: &ty::BuiltinBounds);
fn emit_auto_adjustment<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
adj: &ty::AutoAdjustment<'tcx>);
fn emit_autoref<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
autoref: &ty::AutoRef<'tcx>);
fn emit_auto_deref_ref<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
auto_deref_ref: &ty::AutoDerefRef<'tcx>);
fn emit_unsize_kind<'a>(&mut self, ecx: &e::EncodeContext<'a, 'tcx>,
uk: &ty::UnsizeKind<'tcx>);
}
impl<'a, 'tcx> rbml_writer_helpers<'tcx> for Encoder<'a> {
fn emit_closure_type<'b>(&mut self,
ecx: &e::EncodeContext<'b, 'tcx>,
closure_type: &ty::ClosureTy<'tcx>) {
self.emit_opaque(|this| {
Ok(e::write_closure_type(ecx, this, closure_type))
});
}
fn emit_method_origin<'b>(&mut self,
ecx: &e::EncodeContext<'b, 'tcx>,
method_origin: &ty::MethodOrigin<'tcx>)
{
use serialize::Encoder;
self.emit_enum("MethodOrigin", |this| {
match *method_origin {
ty::MethodStatic(def_id) => {
this.emit_enum_variant("MethodStatic", 0, 1, |this| {
Ok(this.emit_def_id(def_id))
})
}
ty::MethodStaticUnboxedClosure(def_id) => {
this.emit_enum_variant("MethodStaticUnboxedClosure", 1, 1, |this| {
Ok(this.emit_def_id(def_id))
})
}
ty::MethodTypeParam(ref p) => {
this.emit_enum_variant("MethodTypeParam", 2, 1, |this| {
this.emit_struct("MethodParam", 2, |this| {
try!(this.emit_struct_field("trait_ref", 0, |this| {
Ok(this.emit_trait_ref(ecx, &*p.trait_ref))
}));
try!(this.emit_struct_field("method_num", 0, |this| {
this.emit_uint(p.method_num)
}));
Ok(())
})
})
}
ty::MethodTraitObject(ref o) => {
this.emit_enum_variant("MethodTraitObject", 3, 1, |this| {
this.emit_struct("MethodObject", 2, |this| {
try!(this.emit_struct_field("trait_ref", 0, |this| {
Ok(this.emit_trait_ref(ecx, &*o.trait_ref))
}));
try!(this.emit_struct_field("object_trait_id", 0, |this| {
Ok(this.emit_def_id(o.object_trait_id))
}));
try!(this.emit_struct_field("method_num", 0, |this| {
this.emit_uint(o.method_num)
}));
try!(this.emit_struct_field("real_index", 0, |this| {
this.emit_uint(o.real_index)
}));
Ok(())
})
})
}
}
});
}
fn emit_ty<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>, ty: Ty<'tcx>) {
self.emit_opaque(|this| Ok(e::write_type(ecx, this, ty)));
}
fn emit_tys<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>, tys: &[Ty<'tcx>]) {
self.emit_from_vec(tys, |this, ty| Ok(this.emit_ty(ecx, *ty)));
}
fn emit_trait_ref<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
trait_ref: &ty::TraitRef<'tcx>) {
self.emit_opaque(|this| Ok(e::write_trait_ref(ecx, this, trait_ref)));
}
fn emit_type_param_def<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
type_param_def: &ty::TypeParameterDef<'tcx>) {
self.emit_opaque(|this| {
Ok(tyencode::enc_type_param_def(this.writer,
&ecx.ty_str_ctxt(),
type_param_def))
});
}
fn emit_predicate<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
predicate: &ty::Predicate<'tcx>) {
self.emit_opaque(|this| {
Ok(tyencode::enc_predicate(this.writer,
&ecx.ty_str_ctxt(),
predicate))
});
}
fn emit_type_scheme<'b>(&mut self,
ecx: &e::EncodeContext<'b, 'tcx>,
type_scheme: ty::TypeScheme<'tcx>) {
use serialize::Encoder;
self.emit_struct("TypeScheme", 2, |this| {
this.emit_struct_field("generics", 0, |this| {
this.emit_struct("Generics", 2, |this| {
this.emit_struct_field("types", 0, |this| {
Ok(encode_vec_per_param_space(
this, &type_scheme.generics.types,
|this, def| this.emit_type_param_def(ecx, def)))
});
this.emit_struct_field("regions", 1, |this| {
Ok(encode_vec_per_param_space(
this, &type_scheme.generics.regions,
|this, def| def.encode(this).unwrap()))
});
this.emit_struct_field("predicates", 2, |this| {
Ok(encode_vec_per_param_space(
this, &type_scheme.generics.predicates,
|this, def| this.emit_predicate(ecx, def)))
})
})
});
this.emit_struct_field("ty", 1, |this| {
Ok(this.emit_ty(ecx, type_scheme.ty))
})
});
}
fn emit_existential_bounds<'b>(&mut self, ecx: &e::EncodeContext<'b,'tcx>,
bounds: &ty::ExistentialBounds<'tcx>) {
self.emit_opaque(|this| Ok(tyencode::enc_existential_bounds(this.writer,
&ecx.ty_str_ctxt(),
bounds)));
}
fn emit_builtin_bounds(&mut self, ecx: &e::EncodeContext, bounds: &ty::BuiltinBounds) {
self.emit_opaque(|this| Ok(tyencode::enc_builtin_bounds(this.writer,
&ecx.ty_str_ctxt(),
bounds)));
}
fn emit_substs<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
substs: &subst::Substs<'tcx>) {
self.emit_opaque(|this| Ok(tyencode::enc_substs(this.writer,
&ecx.ty_str_ctxt(),
substs)));
}
fn emit_auto_adjustment<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
adj: &ty::AutoAdjustment<'tcx>) {
use serialize::Encoder;
self.emit_enum("AutoAdjustment", |this| {
match *adj {
ty::AdjustReifyFnPointer(def_id) => {
this.emit_enum_variant("AdjustReifyFnPointer", 1, 2, |this| {
this.emit_enum_variant_arg(0, |this| def_id.encode(this))
})
}
ty::AdjustDerefRef(ref auto_deref_ref) => {
this.emit_enum_variant("AdjustDerefRef", 2, 2, |this| {
this.emit_enum_variant_arg(0,
|this| Ok(this.emit_auto_deref_ref(ecx, auto_deref_ref)))
})
}
}
});
}
fn emit_autoref<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
autoref: &ty::AutoRef<'tcx>) {
use serialize::Encoder;
self.emit_enum("AutoRef", |this| {
match autoref {
&ty::AutoPtr(r, m, None) => {
this.emit_enum_variant("AutoPtr", 0, 3, |this| {
this.emit_enum_variant_arg(0, |this| r.encode(this));
this.emit_enum_variant_arg(1, |this| m.encode(this));
this.emit_enum_variant_arg(2,
|this| this.emit_option(|this| this.emit_option_none()))
})
}
&ty::AutoPtr(r, m, Some(box ref a)) => {
this.emit_enum_variant("AutoPtr", 0, 3, |this| {
this.emit_enum_variant_arg(0, |this| r.encode(this));
this.emit_enum_variant_arg(1, |this| m.encode(this));
this.emit_enum_variant_arg(2, |this| this.emit_option(
|this| this.emit_option_some(|this| Ok(this.emit_autoref(ecx, a)))))
})
}
&ty::AutoUnsize(ref uk) => {
this.emit_enum_variant("AutoUnsize", 1, 1, |this| {
this.emit_enum_variant_arg(0, |this| Ok(this.emit_unsize_kind(ecx, uk)))
})
}
&ty::AutoUnsizeUniq(ref uk) => {
this.emit_enum_variant("AutoUnsizeUniq", 2, 1, |this| {
this.emit_enum_variant_arg(0, |this| Ok(this.emit_unsize_kind(ecx, uk)))
})
}
&ty::AutoUnsafe(m, None) => {
this.emit_enum_variant("AutoUnsafe", 3, 2, |this| {
this.emit_enum_variant_arg(0, |this| m.encode(this));
this.emit_enum_variant_arg(1,
|this| this.emit_option(|this| this.emit_option_none()))
})
}
&ty::AutoUnsafe(m, Some(box ref a)) => {
this.emit_enum_variant("AutoUnsafe", 3, 2, |this| {
this.emit_enum_variant_arg(0, |this| m.encode(this));
this.emit_enum_variant_arg(1, |this| this.emit_option(
|this| this.emit_option_some(|this| Ok(this.emit_autoref(ecx, a)))))
})
}
}
});
}
fn emit_auto_deref_ref<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
auto_deref_ref: &ty::AutoDerefRef<'tcx>) {
use serialize::Encoder;
self.emit_struct("AutoDerefRef", 2, |this| {
this.emit_struct_field("autoderefs", 0, |this| auto_deref_ref.autoderefs.encode(this));
this.emit_struct_field("autoref", 1, |this| {
this.emit_option(|this| {
match auto_deref_ref.autoref {
None => this.emit_option_none(),
Some(ref a) => this.emit_option_some(|this| Ok(this.emit_autoref(ecx, a))),
}
})
})
});
}
fn emit_unsize_kind<'b>(&mut self, ecx: &e::EncodeContext<'b, 'tcx>,
uk: &ty::UnsizeKind<'tcx>) {
use serialize::Encoder;
self.emit_enum("UnsizeKind", |this| {
match *uk {
ty::UnsizeLength(len) => {
this.emit_enum_variant("UnsizeLength", 0, 1, |this| {
this.emit_enum_variant_arg(0, |this| len.encode(this))
})
}
ty::UnsizeStruct(box ref uk, idx) => {
this.emit_enum_variant("UnsizeStruct", 1, 2, |this| {
this.emit_enum_variant_arg(0, |this| Ok(this.emit_unsize_kind(ecx, uk)));
this.emit_enum_variant_arg(1, |this| idx.encode(this))
})
}
ty::UnsizeVtable(ty::TyTrait { ref principal,
bounds: ref b },
self_ty) => {
this.emit_enum_variant("UnsizeVtable", 2, 4, |this| {
this.emit_enum_variant_arg(0, |this| {
try!(this.emit_struct_field("principal", 0, |this| {
Ok(this.emit_trait_ref(ecx, &*principal.0))
}));
this.emit_struct_field("bounds", 1, |this| {
Ok(this.emit_existential_bounds(ecx, b))
})
});
this.emit_enum_variant_arg(1, |this| Ok(this.emit_ty(ecx, self_ty)))
})
}
}
});
}
}
trait write_tag_and_id {
fn tag<F>(&mut self, tag_id: c::astencode_tag, f: F) where F: FnOnce(&mut Self);
fn id(&mut self, id: ast::NodeId);
}
impl<'a> write_tag_and_id for Encoder<'a> {
fn tag<F>(&mut self,
tag_id: c::astencode_tag,
f: F) where
F: FnOnce(&mut Encoder<'a>),
{
self.start_tag(tag_id as uint);
f(self);
self.end_tag();
}
fn id(&mut self, id: ast::NodeId) {
self.wr_tagged_u64(c::tag_table_id as uint, id as u64);
}
}
struct SideTableEncodingIdVisitor<'a, 'b:'a, 'c:'a, 'tcx:'c> {
ecx: &'a e::EncodeContext<'c, 'tcx>,
rbml_w: &'a mut Encoder<'b>,
}
impl<'a, 'b, 'c, 'tcx> ast_util::IdVisitingOperation for
SideTableEncodingIdVisitor<'a, 'b, 'c, 'tcx> {
fn visit_id(&mut self, id: ast::NodeId) {
encode_side_tables_for_id(self.ecx, self.rbml_w, id)
}
}
fn encode_side_tables_for_ii(ecx: &e::EncodeContext,
rbml_w: &mut Encoder,
ii: &ast::InlinedItem) {
rbml_w.start_tag(c::tag_table as uint);
ast_util::visit_ids_for_inlined_item(ii, &mut SideTableEncodingIdVisitor {
ecx: ecx,
rbml_w: rbml_w
});
rbml_w.end_tag();
}
fn encode_side_tables_for_id(ecx: &e::EncodeContext,
rbml_w: &mut Encoder,
id: ast::NodeId) {
let tcx = ecx.tcx;
debug!("Encoding side tables for id {}", id);
for def in tcx.def_map.borrow().get(&id).iter() {
rbml_w.tag(c::tag_table_def, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| (*def).encode(rbml_w).unwrap());
})
}
for &ty in tcx.node_types.borrow().get(&id).iter() {
rbml_w.tag(c::tag_table_node_type, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
rbml_w.emit_ty(ecx, *ty);
})
})
}
for &item_substs in tcx.item_substs.borrow().get(&id).iter() {
rbml_w.tag(c::tag_table_item_subst, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
rbml_w.emit_substs(ecx, &item_substs.substs);
})
})
}
for &fv in tcx.freevars.borrow().get(&id).iter() {
rbml_w.tag(c::tag_table_freevars, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
rbml_w.emit_from_vec(fv.as_slice(), |rbml_w, fv_entry| {
Ok(encode_freevar_entry(rbml_w, fv_entry))
});
})
});
for freevar in fv.iter() {
match tcx.capture_mode(id) {
ast::CaptureByRef => {
rbml_w.tag(c::tag_table_upvar_borrow_map, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
let var_id = freevar.def.def_id().node;
let upvar_id = ty::UpvarId {
var_id: var_id,
closure_expr_id: id
};
let upvar_borrow = tcx.upvar_borrow_map.borrow()[upvar_id].clone();
var_id.encode(rbml_w);
upvar_borrow.encode(rbml_w);
})
})
}
_ => {}
}
}
}
for &cm in tcx.capture_modes.borrow().get(&id).iter() {
rbml_w.tag(c::tag_table_capture_modes, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
encode_capture_mode(rbml_w, *cm);
})
})
}
let lid = ast::DefId { krate: ast::LOCAL_CRATE, node: id };
for &type_scheme in tcx.tcache.borrow().get(&lid).iter() {
rbml_w.tag(c::tag_table_tcache, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
rbml_w.emit_type_scheme(ecx, type_scheme.clone());
})
})
}
for &type_param_def in tcx.ty_param_defs.borrow().get(&id).iter() {
rbml_w.tag(c::tag_table_param_defs, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
rbml_w.emit_type_param_def(ecx, type_param_def)
})
})
}
let method_call = MethodCall::expr(id);
for &method in tcx.method_map.borrow().get(&method_call).iter() {
rbml_w.tag(c::tag_table_method_map, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
encode_method_callee(ecx, rbml_w, method_call.adjustment, method)
})
})
}
for &trait_ref in tcx.object_cast_map.borrow().get(&id).iter() {
rbml_w.tag(c::tag_table_object_cast_map, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
rbml_w.emit_trait_ref(ecx, &*trait_ref.0);
})
})
}
for &adjustment in tcx.adjustments.borrow().get(&id).iter() {
match *adjustment {
_ if ty::adjust_is_object(adjustment) => {
let method_call = MethodCall::autoobject(id);
for &method in tcx.method_map.borrow().get(&method_call).iter() {
rbml_w.tag(c::tag_table_method_map, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
encode_method_callee(ecx, rbml_w, method_call.adjustment, method)
})
})
}
}
ty::AdjustDerefRef(ref adj) => {
assert!(!ty::adjust_is_object(adjustment));
for autoderef in range(0, adj.autoderefs) {
let method_call = MethodCall::autoderef(id, autoderef);
for &method in tcx.method_map.borrow().get(&method_call).iter() {
rbml_w.tag(c::tag_table_method_map, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
encode_method_callee(ecx, rbml_w,
method_call.adjustment, method)
})
})
}
}
}
_ => {
assert!(!ty::adjust_is_object(adjustment));
}
}
rbml_w.tag(c::tag_table_adjustments, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
rbml_w.emit_auto_adjustment(ecx, adjustment);
})
})
}
for unboxed_closure in tcx.unboxed_closures
.borrow()
.get(&ast_util::local_def(id))
.iter() {
rbml_w.tag(c::tag_table_unboxed_closures, |rbml_w| {
rbml_w.id(id);
rbml_w.tag(c::tag_table_val, |rbml_w| {
rbml_w.emit_closure_type(ecx, &unboxed_closure.closure_type);
encode_unboxed_closure_kind(rbml_w, unboxed_closure.kind)
})
})
}
}
trait doc_decoder_helpers {
fn as_int(&self) -> int;
fn opt_child(&self, tag: c::astencode_tag) -> Option<Self>;
}
impl<'a> doc_decoder_helpers for rbml::Doc<'a> {
fn as_int(&self) -> int { reader::doc_as_u64(*self) as int }
fn opt_child(&self, tag: c::astencode_tag) -> Option<rbml::Doc<'a>> {
reader::maybe_get_doc(*self, tag as uint)
}
}
trait rbml_decoder_decoder_helpers<'tcx> {
fn read_method_origin<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> ty::MethodOrigin<'tcx>;
fn read_ty<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>) -> Ty<'tcx>;
fn read_tys<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>) -> Vec<Ty<'tcx>>;
fn read_trait_ref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> Rc<ty::TraitRef<'tcx>>;
fn read_poly_trait_ref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> ty::PolyTraitRef<'tcx>;
fn read_type_param_def<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> ty::TypeParameterDef<'tcx>;
fn read_predicate<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> ty::Predicate<'tcx>;
fn read_type_scheme<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> ty::TypeScheme<'tcx>;
fn read_existential_bounds<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> ty::ExistentialBounds<'tcx>;
fn read_substs<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> subst::Substs<'tcx>;
fn read_auto_adjustment<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> ty::AutoAdjustment<'tcx>;
fn read_unboxed_closure<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> ty::UnboxedClosure<'tcx>;
fn read_auto_deref_ref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> ty::AutoDerefRef<'tcx>;
fn read_autoref<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> ty::AutoRef<'tcx>;
fn read_unsize_kind<'a, 'b>(&mut self, dcx: &DecodeContext<'a, 'b, 'tcx>)
-> ty::UnsizeKind<'tcx>;
fn convert_def_id(&mut self,
dcx: &DecodeContext,
source: DefIdSource,
did: ast::DefId)
-> ast::DefId;
// Versions of the type reading functions that don't need the full
// DecodeContext.
fn read_ty_nodcx(&mut self,
tcx: &ty::ctxt<'tcx>, cdata: &cstore::crate_metadata) -> Ty<'tcx>;
fn read_tys_nodcx(&mut self,
tcx: &ty::ctxt<'tcx>,
cdata: &cstore::crate_metadata) -> Vec<Ty<'tcx>>;
fn read_substs_nodcx(&mut self, tcx: &ty::ctxt<'tcx>,
cdata: &cstore::crate_metadata)
-> subst::Substs<'tcx>;
}
impl<'a, 'tcx> rbml_decoder_decoder_helpers<'tcx> for reader::Decoder<'a> {
fn read_ty_nodcx(&mut self,
tcx: &ty::ctxt<'tcx>, cdata: &cstore::crate_metadata) -> Ty<'tcx> {
self.read_opaque(|_, doc| {
Ok(tydecode::parse_ty_data(
doc.data,
cdata.cnum,
doc.start,
tcx,
|_, id| decoder::translate_def_id(cdata, id)))
}).unwrap()
}
fn read_tys_nodcx(&mut self,
tcx: &ty::ctxt<'tcx>,
cdata: &cstore::crate_metadata) -> Vec<Ty<'tcx>> {
self.read_to_vec(|this| Ok(this.read_ty_nodcx(tcx, cdata)) )
.unwrap()
.into_iter()
.collect()
}
fn read_substs_nodcx(&mut self,
tcx: &ty::ctxt<'tcx>,
cdata: &cstore::crate_metadata)
-> subst::Substs<'tcx>
{
self.read_opaque(|_, doc| {
Ok(tydecode::parse_substs_data(
doc.data,
cdata.cnum,
doc.start,
tcx,
|_, id| decoder::translate_def_id(cdata, id)))
}).unwrap()
}
fn read_method_origin<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> ty::MethodOrigin<'tcx>
{
self.read_enum("MethodOrigin", |this| {
let variants = &["MethodStatic", "MethodStaticUnboxedClosure",
"MethodTypeParam", "MethodTraitObject"];
this.read_enum_variant(variants, |this, i| {
Ok(match i {
0 => {
let def_id = this.read_def_id(dcx);
ty::MethodStatic(def_id)
}
1 => {
let def_id = this.read_def_id(dcx);
ty::MethodStaticUnboxedClosure(def_id)
}
2 => {
this.read_struct("MethodTypeParam", 2, |this| {
Ok(ty::MethodTypeParam(
ty::MethodParam {
trait_ref: {
this.read_struct_field("trait_ref", 0, |this| {
Ok(this.read_trait_ref(dcx))
}).unwrap()
},
method_num: {
this.read_struct_field("method_num", 1, |this| {
this.read_uint()
}).unwrap()
}
}))
}).unwrap()
}
3 => {
this.read_struct("MethodTraitObject", 2, |this| {
Ok(ty::MethodTraitObject(
ty::MethodObject {
trait_ref: {
this.read_struct_field("trait_ref", 0, |this| {
Ok(this.read_trait_ref(dcx))
}).unwrap()
},
object_trait_id: {
this.read_struct_field("object_trait_id", 1, |this| {
Ok(this.read_def_id(dcx))
}).unwrap()
},
method_num: {
this.read_struct_field("method_num", 2, |this| {
this.read_uint()
}).unwrap()
},
real_index: {
this.read_struct_field("real_index", 3, |this| {
this.read_uint()
}).unwrap()
},
}))
}).unwrap()
}
_ => panic!("..")
})
})
}).unwrap()
}
fn read_ty<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>) -> Ty<'tcx> {
// Note: regions types embed local node ids. In principle, we
// should translate these node ids into the new decode
// context. However, we do not bother, because region types
// are not used during trans.
return self.read_opaque(|this, doc| {
debug!("read_ty({})", type_string(doc));
let ty = tydecode::parse_ty_data(
doc.data,
dcx.cdata.cnum,
doc.start,
dcx.tcx,
|s, a| this.convert_def_id(dcx, s, a));
Ok(ty)
}).unwrap();
fn type_string(doc: rbml::Doc) -> String {
let mut str = String::new();
for i in range(doc.start, doc.end) {
str.push(doc.data[i] as char);
}
str
}
}
fn read_tys<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> Vec<Ty<'tcx>> {
self.read_to_vec(|this| Ok(this.read_ty(dcx))).unwrap().into_iter().collect()
}
fn read_trait_ref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> Rc<ty::TraitRef<'tcx>> {
self.read_opaque(|this, doc| {
let ty = tydecode::parse_trait_ref_data(
doc.data,
dcx.cdata.cnum,
doc.start,
dcx.tcx,
|s, a| this.convert_def_id(dcx, s, a));
Ok(ty)
}).unwrap()
}
fn read_poly_trait_ref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> ty::PolyTraitRef<'tcx> {
ty::Binder(self.read_opaque(|this, doc| {
let ty = tydecode::parse_trait_ref_data(
doc.data,
dcx.cdata.cnum,
doc.start,
dcx.tcx,
|s, a| this.convert_def_id(dcx, s, a));
Ok(ty)
}).unwrap())
}
fn read_type_param_def<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> ty::TypeParameterDef<'tcx> {
self.read_opaque(|this, doc| {
Ok(tydecode::parse_type_param_def_data(
doc.data,
doc.start,
dcx.cdata.cnum,
dcx.tcx,
|s, a| this.convert_def_id(dcx, s, a)))
}).unwrap()
}
fn read_predicate<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> ty::Predicate<'tcx>
{
self.read_opaque(|this, doc| {
Ok(tydecode::parse_predicate_data(doc.data, doc.start, dcx.cdata.cnum, dcx.tcx,
|s, a| this.convert_def_id(dcx, s, a)))
}).unwrap()
}
fn read_type_scheme<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> ty::TypeScheme<'tcx> {
self.read_struct("TypeScheme", 2, |this| {
Ok(ty::TypeScheme {
generics: this.read_struct_field("generics", 0, |this| {
this.read_struct("Generics", 2, |this| {
Ok(ty::Generics {
types:
this.read_struct_field("types", 0, |this| {
Ok(this.read_vec_per_param_space(
|this| this.read_type_param_def(dcx)))
}).unwrap(),
regions:
this.read_struct_field("regions", 1, |this| {
Ok(this.read_vec_per_param_space(
|this| Decodable::decode(this).unwrap()))
}).unwrap(),
predicates:
this.read_struct_field("predicates", 2, |this| {
Ok(this.read_vec_per_param_space(
|this| this.read_predicate(dcx)))
}).unwrap(),
})
})
}).unwrap(),
ty: this.read_struct_field("ty", 1, |this| {
Ok(this.read_ty(dcx))
}).unwrap()
})
}).unwrap()
}
fn read_existential_bounds<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> ty::ExistentialBounds<'tcx>
{
self.read_opaque(|this, doc| {
Ok(tydecode::parse_existential_bounds_data(doc.data,
dcx.cdata.cnum,
doc.start,
dcx.tcx,
|s, a| this.convert_def_id(dcx, s, a)))
}).unwrap()
}
fn read_substs<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> subst::Substs<'tcx> {
self.read_opaque(|this, doc| {
Ok(tydecode::parse_substs_data(doc.data,
dcx.cdata.cnum,
doc.start,
dcx.tcx,
|s, a| this.convert_def_id(dcx, s, a)))
}).unwrap()
}
fn read_auto_adjustment<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> ty::AutoAdjustment<'tcx> {
self.read_enum("AutoAdjustment", |this| {
let variants = ["AutoAddEnv", "AutoDerefRef"];
this.read_enum_variant(&variants, |this, i| {
Ok(match i {
1 => {
let def_id: ast::DefId =
this.read_def_id(dcx);
ty::AdjustReifyFnPointer(def_id)
}
2 => {
let auto_deref_ref: ty::AutoDerefRef =
this.read_enum_variant_arg(0,
|this| Ok(this.read_auto_deref_ref(dcx))).unwrap();
ty::AdjustDerefRef(auto_deref_ref)
}
_ => panic!("bad enum variant for ty::AutoAdjustment")
})
})
}).unwrap()
}
fn read_auto_deref_ref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> ty::AutoDerefRef<'tcx> {
self.read_struct("AutoDerefRef", 2, |this| {
Ok(ty::AutoDerefRef {
autoderefs: this.read_struct_field("autoderefs", 0, |this| {
Decodable::decode(this)
}).unwrap(),
autoref: this.read_struct_field("autoref", 1, |this| {
this.read_option(|this, b| {
if b {
Ok(Some(this.read_autoref(dcx)))
} else {
Ok(None)
}
})
}).unwrap(),
})
}).unwrap()
}
fn read_autoref<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>) -> ty::AutoRef<'tcx> {
self.read_enum("AutoRef", |this| {
let variants = ["AutoPtr",
"AutoUnsize",
"AutoUnsizeUniq",
"AutoUnsafe"];
this.read_enum_variant(&variants, |this, i| {
Ok(match i {
0 => {
let r: ty::Region =
this.read_enum_variant_arg(0, |this| Decodable::decode(this)).unwrap();
let m: ast::Mutability =
this.read_enum_variant_arg(1, |this| Decodable::decode(this)).unwrap();
let a: Option<Box<ty::AutoRef>> =
this.read_enum_variant_arg(2, |this| this.read_option(|this, b| {
if b {
Ok(Some(box this.read_autoref(dcx)))
} else {
Ok(None)
}
})).unwrap();
ty::AutoPtr(r.tr(dcx), m, a)
}
1 => {
let uk: ty::UnsizeKind =
this.read_enum_variant_arg(0,
|this| Ok(this.read_unsize_kind(dcx))).unwrap();
ty::AutoUnsize(uk)
}
2 => {
let uk: ty::UnsizeKind =
this.read_enum_variant_arg(0,
|this| Ok(this.read_unsize_kind(dcx))).unwrap();
ty::AutoUnsizeUniq(uk)
}
3 => {
let m: ast::Mutability =
this.read_enum_variant_arg(0, |this| Decodable::decode(this)).unwrap();
let a: Option<Box<ty::AutoRef>> =
this.read_enum_variant_arg(1, |this| this.read_option(|this, b| {
if b {
Ok(Some(box this.read_autoref(dcx)))
} else {
Ok(None)
}
})).unwrap();
ty::AutoUnsafe(m, a)
}
_ => panic!("bad enum variant for ty::AutoRef")
})
})
}).unwrap()
}
fn read_unsize_kind<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> ty::UnsizeKind<'tcx> {
self.read_enum("UnsizeKind", |this| {
let variants = &["UnsizeLength", "UnsizeStruct", "UnsizeVtable"];
this.read_enum_variant(variants, |this, i| {
Ok(match i {
0 => {
let len: uint =
this.read_enum_variant_arg(0, |this| Decodable::decode(this)).unwrap();
ty::UnsizeLength(len)
}
1 => {
let uk: ty::UnsizeKind =
this.read_enum_variant_arg(0,
|this| Ok(this.read_unsize_kind(dcx))).unwrap();
let idx: uint =
this.read_enum_variant_arg(1, |this| Decodable::decode(this)).unwrap();
ty::UnsizeStruct(box uk, idx)
}
2 => {
let ty_trait = try!(this.read_enum_variant_arg(0, |this| {
let principal = try!(this.read_struct_field("principal", 0, |this| {
Ok(this.read_poly_trait_ref(dcx))
}));
Ok(ty::TyTrait {
principal: principal,
bounds: try!(this.read_struct_field("bounds", 1, |this| {
Ok(this.read_existential_bounds(dcx))
})),
})
}));
let self_ty =
this.read_enum_variant_arg(1, |this| Ok(this.read_ty(dcx))).unwrap();
ty::UnsizeVtable(ty_trait, self_ty)
}
_ => panic!("bad enum variant for ty::UnsizeKind")
})
})
}).unwrap()
}
fn read_unboxed_closure<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)
-> ty::UnboxedClosure<'tcx> {
let closure_type = self.read_opaque(|this, doc| {
Ok(tydecode::parse_ty_closure_data(
doc.data,
dcx.cdata.cnum,
doc.start,
dcx.tcx,
|s, a| this.convert_def_id(dcx, s, a)))
}).unwrap();
let variants = &[
"FnUnboxedClosureKind",
"FnMutUnboxedClosureKind",
"FnOnceUnboxedClosureKind"
];
let kind = self.read_enum("UnboxedClosureKind", |this| {
this.read_enum_variant(variants, |_, i| {
Ok(match i {
0 => ty::FnUnboxedClosureKind,
1 => ty::FnMutUnboxedClosureKind,
2 => ty::FnOnceUnboxedClosureKind,
_ => panic!("bad enum variant for ty::UnboxedClosureKind"),
})
})
}).unwrap();
ty::UnboxedClosure {
closure_type: closure_type,
kind: kind,
}
}
/// Converts a def-id that appears in a type. The correct
/// translation will depend on what kind of def-id this is.
/// This is a subtle point: type definitions are not
/// inlined into the current crate, so if the def-id names
/// a nominal type or type alias, then it should be
/// translated to refer to the source crate.
///
/// However, *type parameters* are cloned along with the function
/// they are attached to. So we should translate those def-ids
/// to refer to the new, cloned copy of the type parameter.
/// We only see references to free type parameters in the body of
/// an inlined function. In such cases, we need the def-id to
/// be a local id so that the TypeContents code is able to lookup
/// the relevant info in the ty_param_defs table.
///
/// *Region parameters*, unfortunately, are another kettle of fish.
/// In such cases, def_id's can appear in types to distinguish
/// shadowed bound regions and so forth. It doesn't actually
/// matter so much what we do to these, since regions are erased
/// at trans time, but it's good to keep them consistent just in
/// case. We translate them with `tr_def_id()` which will map
/// the crate numbers back to the original source crate.
///
/// Unboxed closures are cloned along with the function being
/// inlined, and all side tables use interned node IDs, so we
/// translate their def IDs accordingly.
///
/// It'd be really nice to refactor the type repr to not include
/// def-ids so that all these distinctions were unnecessary.
fn convert_def_id(&mut self,
dcx: &DecodeContext,
source: tydecode::DefIdSource,
did: ast::DefId)
-> ast::DefId {
let r = match source {
NominalType | TypeWithId | RegionParameter => dcx.tr_def_id(did),
TypeParameter | UnboxedClosureSource => dcx.tr_intern_def_id(did)
};
debug!("convert_def_id(source={:?}, did={:?})={:?}", source, did, r);
return r;
}
}
fn decode_side_tables(dcx: &DecodeContext,
ast_doc: rbml::Doc) {
let tbl_doc = ast_doc.get(c::tag_table as uint);
reader::docs(tbl_doc, |tag, entry_doc| {
let id0 = entry_doc.get(c::tag_table_id as uint).as_int();
let id = dcx.tr_id(id0 as ast::NodeId);
debug!(">> Side table document with tag 0x{:x} \
found for id {} (orig {})",
tag, id, id0);
match c::astencode_tag::from_uint(tag) {
None => {
dcx.tcx.sess.bug(
&format!("unknown tag found in side tables: {:x}",
tag)[]);
}
Some(value) => {
let val_doc = entry_doc.get(c::tag_table_val as uint);
let mut val_dsr = reader::Decoder::new(val_doc);
let val_dsr = &mut val_dsr;
match value {
c::tag_table_def => {
let def = decode_def(dcx, val_doc);
dcx.tcx.def_map.borrow_mut().insert(id, def);
}
c::tag_table_node_type => {
let ty = val_dsr.read_ty(dcx);
debug!("inserting ty for node {}: {}",
id, ty_to_string(dcx.tcx, ty));
dcx.tcx.node_types.borrow_mut().insert(id, ty);
}
c::tag_table_item_subst => {
let item_substs = ty::ItemSubsts {
substs: val_dsr.read_substs(dcx)
};
dcx.tcx.item_substs.borrow_mut().insert(
id, item_substs);
}
c::tag_table_freevars => {
let fv_info = val_dsr.read_to_vec(|val_dsr| {
Ok(val_dsr.read_freevar_entry(dcx))
}).unwrap().into_iter().collect();
dcx.tcx.freevars.borrow_mut().insert(id, fv_info);
}
c::tag_table_upvar_borrow_map => {
let var_id: ast::NodeId = Decodable::decode(val_dsr).unwrap();
let upvar_id = ty::UpvarId {
var_id: dcx.tr_id(var_id),
closure_expr_id: id
};
let ub: ty::UpvarBorrow = Decodable::decode(val_dsr).unwrap();
dcx.tcx.upvar_borrow_map.borrow_mut().insert(upvar_id, ub.tr(dcx));
}
c::tag_table_capture_modes => {
let capture_mode = val_dsr.read_capture_mode();
dcx.tcx
.capture_modes
.borrow_mut()
.insert(id, capture_mode);
}
c::tag_table_tcache => {
let type_scheme = val_dsr.read_type_scheme(dcx);
let lid = ast::DefId { krate: ast::LOCAL_CRATE, node: id };
dcx.tcx.tcache.borrow_mut().insert(lid, type_scheme);
}
c::tag_table_param_defs => {
let bounds = val_dsr.read_type_param_def(dcx);
dcx.tcx.ty_param_defs.borrow_mut().insert(id, bounds);
}
c::tag_table_method_map => {
let (adjustment, method) = val_dsr.read_method_callee(dcx);
let method_call = MethodCall {
expr_id: id,
adjustment: adjustment
};
dcx.tcx.method_map.borrow_mut().insert(method_call, method);
}
c::tag_table_object_cast_map => {
let trait_ref = val_dsr.read_poly_trait_ref(dcx);
dcx.tcx.object_cast_map.borrow_mut()
.insert(id, trait_ref);
}
c::tag_table_adjustments => {
let adj: ty::AutoAdjustment = val_dsr.read_auto_adjustment(dcx);
dcx.tcx.adjustments.borrow_mut().insert(id, adj);
}
c::tag_table_unboxed_closures => {
let unboxed_closure =
val_dsr.read_unboxed_closure(dcx);
dcx.tcx
.unboxed_closures
.borrow_mut()
.insert(ast_util::local_def(id),
unboxed_closure);
}
_ => {
dcx.tcx.sess.bug(
&format!("unknown tag found in side tables: {:x}",
tag)[]);
}
}
}
}
debug!(">< Side table doc loaded");
true
});
}
// ______________________________________________________________________
// Testing of astencode_gen
#[cfg(test)]
fn encode_item_ast(rbml_w: &mut Encoder, item: &ast::Item) {
rbml_w.start_tag(c::tag_tree as uint);
(*item).encode(rbml_w);
rbml_w.end_tag();
}
#[cfg(test)]
fn decode_item_ast(par_doc: rbml::Doc) -> ast::Item {
let chi_doc = par_doc.get(c::tag_tree as uint);
let mut d = reader::Decoder::new(chi_doc);
Decodable::decode(&mut d).unwrap()
}
#[cfg(test)]
trait fake_ext_ctxt {
fn cfg(&self) -> ast::CrateConfig;
fn parse_sess<'a>(&'a self) -> &'a parse::ParseSess;
fn call_site(&self) -> Span;
fn ident_of(&self, st: &str) -> ast::Ident;
}
#[cfg(test)]
impl fake_ext_ctxt for parse::ParseSess {
fn cfg(&self) -> ast::CrateConfig {
Vec::new()
}
fn parse_sess<'a>(&'a self) -> &'a parse::ParseSess { self }
fn call_site(&self) -> Span {
codemap::Span {
lo: codemap::BytePos(0),
hi: codemap::BytePos(0),
expn_id: codemap::NO_EXPANSION
}
}
fn ident_of(&self, st: &str) -> ast::Ident {
token::str_to_ident(st)
}
}
#[cfg(test)]
fn mk_ctxt() -> parse::ParseSess {
parse::new_parse_sess()
}
#[cfg(test)]
fn roundtrip(in_item: Option<P<ast::Item>>) {
let in_item = in_item.unwrap();
let mut wr = SeekableMemWriter::new();
encode_item_ast(&mut writer::Encoder::new(&mut wr), &*in_item);
let rbml_doc = rbml::Doc::new(wr.get_ref());
let out_item = decode_item_ast(rbml_doc);
assert!(*in_item == out_item);
}
#[test]
fn test_basic() {
let cx = mk_ctxt();
roundtrip(quote_item!(&cx,
fn foo() {}
));
}
/* NOTE: When there's a snapshot, update this (yay quasiquoter!)
#[test]
fn test_smalltalk() {
let cx = mk_ctxt();
roundtrip(quote_item!(&cx,
fn foo() -> int { 3 + 4 } // first smalltalk program ever executed.
));
}
*/
#[test]
fn test_more() {
let cx = mk_ctxt();
roundtrip(quote_item!(&cx,
fn foo(x: uint, y: uint) -> uint {
let z = x + y;
return z;
}
));
}
#[test]
fn test_simplification() {
let cx = mk_ctxt();
let item = quote_item!(&cx,
fn new_int_alist<B>() -> alist<int, B> {
fn eq_int(a: int, b: int) -> bool { a == b }
return alist {eq_fn: eq_int, data: Vec::new()};
}
).unwrap();
let item_in = e::IIItemRef(&*item);
let item_out = simplify_ast(item_in);
let item_exp = ast::IIItem(quote_item!(&cx,
fn new_int_alist<B>() -> alist<int, B> {
return alist {eq_fn: eq_int, data: Vec::new()};
}
).unwrap());
match (item_out, item_exp) {
(ast::IIItem(item_out), ast::IIItem(item_exp)) => {
assert!(pprust::item_to_string(&*item_out) ==
pprust::item_to_string(&*item_exp));
}
_ => panic!()
}
}
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