rust/src/comp/metadata/astencode.rs

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import syntax::ast;
import syntax::fold;
import syntax::visit;
import syntax::ast_util;
import syntax::codemap::span;
import std::map::map;
import std::smallintmap::map;
import std::ebml;
import std::ebml::writer;
import std::serialization;
import std::serialization::serializer;
import std::serialization::deserializer;
import std::serialization::serializer_helpers;
import std::serialization::deserializer_helpers;
import middle::trans::common::maps;
import middle::ty;
import middle::typeck;
import middle::typeck::method_origin;
import middle::typeck::dict_res;
import middle::typeck::dict_origin;
import middle::ast_map;
import driver::session;
import driver::session::session;
import middle::freevars::freevar_entry;
import c = common;
import e = encoder;
// used in testing:
import std::io;
import driver::diagnostic;
import syntax::codemap;
import syntax::parse::parser;
import syntax::print::pprust;
export encode_inlined_item;
export decode_inlined_item;
type decode_ctxt = @{
cdata: cstore::crate_metadata,
tcx: ty::ctxt,
maps: maps
};
type extended_decode_ctxt = @{
dcx: decode_ctxt,
from_id_range: id_range,
to_id_range: id_range
};
iface tr {
fn tr(xcx: extended_decode_ctxt) -> self;
}
// ______________________________________________________________________
// Enumerating the IDs which appear in an AST
fn encode_inlined_item(ecx: @e::encode_ctxt,
ebml_w: ebml::writer,
item: @ast::item) {
let id_range = compute_id_range(item);
ebml_w.wr_tag(c::tag_ast as uint) {||
encode_id_range(ebml_w, id_range);
encode_ast(ebml_w, item);
encode_side_tables_for_item(ecx, ebml_w, item);
}
}
fn decode_inlined_item(cdata: cstore::crate_metadata,
tcx: ty::ctxt,
maps: maps,
path: ast_map::path,
par_doc: ebml::doc) -> option<@ast::item> {
let dcx = @{cdata: cdata, tcx: tcx, maps: maps};
alt par_doc.opt_child(c::tag_ast) {
none { none }
some(ast_doc) {
let from_id_range = decode_id_range(ast_doc);
let to_id_range = reserve_id_range(dcx.tcx.sess, from_id_range);
let xcx = @{dcx: dcx,
from_id_range: from_id_range,
to_id_range: to_id_range};
let raw_item = decode_ast(ast_doc);
let item = renumber_ast(xcx, raw_item);
ast_map::map_decoded_item(dcx.tcx.items, path, item);
decode_side_tables(xcx, ast_doc);
some(item)
}
}
}
// ______________________________________________________________________
// Enumerating the IDs which appear in an AST
type id_range = {min: ast::node_id, max: ast::node_id};
fn empty(range: id_range) -> bool {
range.min >= range.max
}
fn visit_ids(item: @ast::item, vfn: fn@(ast::node_id)) {
let visitor = visit::mk_simple_visitor(@{
visit_mod: fn@(_m: ast::_mod, _sp: span, id: ast::node_id) {
vfn(id)
},
visit_view_item: fn@(vi: @ast::view_item) {
alt vi.node {
ast::view_item_use(_, _, id) { vfn(id) }
ast::view_item_import(vps) | ast::view_item_export(vps) {
vec::iter(vps) {|vp|
alt vp.node {
ast::view_path_simple(_, _, id) { vfn(id) }
ast::view_path_glob(_, id) { vfn(id) }
ast::view_path_list(_, _, id) { vfn(id) }
}
}
}
}
},
visit_native_item: fn@(ni: @ast::native_item) {
vfn(ni.id)
},
visit_item: fn@(i: @ast::item) {
vfn(i.id)
},
visit_local: fn@(l: @ast::local) {
vfn(l.node.id);
},
visit_block: fn@(b: ast::blk) {
vfn(b.node.id);
},
visit_stmt: fn@(s: @ast::stmt) {
vfn(ast_util::stmt_id(*s));
},
visit_arm: fn@(_a: ast::arm) { },
visit_pat: fn@(p: @ast::pat) {
vfn(p.id)
},
visit_decl: fn@(_d: @ast::decl) {
},
visit_expr: fn@(e: @ast::expr) {
vfn(e.id);
alt e.node {
ast::expr_unary(_, _) | ast::expr_binary(_, _, _) {
vfn(ast_util::op_expr_callee_id(e));
}
_ { /* fallthrough */ }
}
},
visit_ty: fn@(t: @ast::ty) {
alt t.node {
ast::ty_path(_, id) {
vfn(id)
}
_ { /* fall through */ }
}
},
visit_ty_params: fn@(ps: [ast::ty_param]) {
vec::iter(ps) {|p| vfn(p.id) }
},
visit_constr: fn@(_p: @ast::path, _sp: span, id: ast::node_id) {
vfn(id);
},
visit_fn: fn@(fk: visit::fn_kind, _d: ast::fn_decl,
_b: ast::blk, _sp: span, id: ast::node_id) {
vfn(id);
alt fk {
visit::fk_item_fn(_, tps) |
visit::fk_method(_, tps) |
visit::fk_res(_, tps) {
vec::iter(tps) {|tp| vfn(tp.id)}
}
visit::fk_anon(_) |
visit::fk_fn_block {
}
}
},
visit_class_item: fn@(_s: span, _p: ast::privacy,
c: ast::class_member) {
alt c {
ast::instance_var(_, _, _, id) {
vfn(id)
}
ast::class_method(_) {
}
}
}
});
visitor.visit_item(item, (), visitor);
}
fn compute_id_range(item: @ast::item) -> id_range {
let min = @mutable int::max_value;
let max = @mutable int::min_value;
visit_ids(item) {|id|
*min = int::min(*min, id);
*max = int::max(*max, id + 1);
}
ret {min:*min, max:*max};
}
fn encode_id_range(ebml_w: ebml::writer, id_range: id_range) {
ebml_w.wr_tag(c::tag_id_range as uint) {||
ebml_w.emit_tup(2u) {||
ebml_w.emit_tup_elt(0u) {|| ebml_w.emit_int(id_range.min) }
ebml_w.emit_tup_elt(1u) {|| ebml_w.emit_int(id_range.max) }
}
}
}
fn decode_id_range(par_doc: ebml::doc) -> id_range {
let range_doc = par_doc[c::tag_id_range];
let dsr = serialization::mk_ebml_deserializer(range_doc);
dsr.read_tup(2u) {||
{min: dsr.read_tup_elt(0u) {|| dsr.read_int() },
max: dsr.read_tup_elt(1u) {|| dsr.read_int() }}
}
}
fn reserve_id_range(sess: session::session,
from_id_range: id_range) -> id_range {
// Handle the case of an empty range:
if empty(from_id_range) { ret from_id_range; }
let cnt = from_id_range.max - from_id_range.min;
let to_id_min = sess.parse_sess.next_id;
let to_id_max = sess.parse_sess.next_id + cnt;
sess.parse_sess.next_id = to_id_max;
ret {min: to_id_min, max: to_id_min};
}
impl translation_routines for extended_decode_ctxt {
fn tr_id(id: ast::node_id) -> ast::node_id {
// from_id_range should be non-empty
assert !empty(self.from_id_range);
(id - self.from_id_range.min + self.to_id_range.min)
}
fn tr_def_id(did: ast::def_id) -> ast::def_id {
decoder::translate_def_id(self.dcx.cdata, did)
}
fn tr_intern_def_id(did: ast::def_id) -> ast::def_id {
assert did.crate == ast::local_crate;
{crate: ast::local_crate, node: self.tr_id(did.node)}
}
fn tr_span(_span: span) -> span {
ast_util::dummy_sp() // TODO...
}
}
impl of tr for ast::def_id {
fn tr(xcx: extended_decode_ctxt) -> ast::def_id {
xcx.tr_def_id(self)
}
fn tr_intern(xcx: extended_decode_ctxt) -> ast::def_id {
xcx.tr_intern_def_id(self)
}
}
impl of tr for span {
fn tr(xcx: extended_decode_ctxt) -> span {
xcx.tr_span(self)
}
}
impl serializer_helpers<S: serialization::serializer> for S {
fn emit_def_id(did: ast::def_id) {
astencode_gen::serialize_syntax_ast_def_id(self, did)
}
}
impl deserializer_helpers<D: serialization::deserializer> for D {
fn read_def_id(xcx: extended_decode_ctxt) -> ast::def_id {
let did = astencode_gen::deserialize_syntax_ast_def_id(self);
did.tr(xcx)
}
}
// ______________________________________________________________________
// 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(ebml_w: ebml::writer, item: @ast::item) {
ebml_w.wr_tag(c::tag_tree as uint) {||
astencode_gen::serialize_syntax_ast_item(ebml_w, *item);
}
}
fn decode_ast(par_doc: ebml::doc) -> @ast::item {
let chi_doc = par_doc[c::tag_tree];
let d = serialization::mk_ebml_deserializer(chi_doc);
@astencode_gen::deserialize_syntax_ast_item(d)
}
fn renumber_ast(xcx: extended_decode_ctxt, item: @ast::item) -> @ast::item {
let fld = fold::make_fold({
new_id: xcx.tr_id(_),
new_span: xcx.tr_span(_)
with *fold::default_ast_fold()
});
fld.fold_item(item)
}
// ______________________________________________________________________
// Encoding and decoding of ast::def
fn encode_def(ebml_w: ebml::writer, def: ast::def) {
astencode_gen::serialize_syntax_ast_def(ebml_w, def)
}
fn decode_def(xcx: extended_decode_ctxt, doc: ebml::doc) -> ast::def {
let dsr = serialization::mk_ebml_deserializer(doc);
let def = astencode_gen::deserialize_syntax_ast_def(dsr);
def.tr(xcx)
}
impl of tr for ast::def {
fn tr(xcx: extended_decode_ctxt) -> ast::def {
alt self {
ast::def_fn(did, p) { ast::def_fn(did.tr(xcx), p) }
ast::def_self(did) { ast::def_self(did.tr(xcx)) }
ast::def_mod(did) { ast::def_mod(did.tr(xcx)) }
ast::def_native_mod(did) { ast::def_native_mod(did.tr(xcx)) }
ast::def_const(did) { ast::def_const(did.tr(xcx)) }
ast::def_arg(did, m) { ast::def_arg(did.tr_intern(xcx), m) }
ast::def_local(did) { ast::def_local(did.tr_intern(xcx)) }
ast::def_variant(e_did, v_did) {
ast::def_variant(e_did.tr(xcx), v_did.tr(xcx))
}
ast::def_ty(did) { ast::def_ty(did.tr(xcx)) }
ast::def_prim_ty(p) { ast::def_prim_ty(p) }
ast::def_ty_param(did, v) { ast::def_ty_param(did.tr(xcx), v) }
ast::def_binding(did) { ast::def_binding(did.tr(xcx)) }
ast::def_use(did) { ast::def_use(did.tr(xcx)) }
ast::def_upvar(did, def, node_id) {
ast::def_upvar(did.tr_intern(xcx),
@(*def).tr(xcx),
xcx.tr_id(node_id))
}
ast::def_class(did) {
ast::def_class(did.tr(xcx))
}
ast::def_class_field(did0, did1) {
ast::def_class_field(did0.tr(xcx), did1.tr(xcx))
}
ast::def_class_method(did0, did1) {
ast::def_class_method(did0.tr(xcx), did1.tr(xcx))
}
}
}
}
// ______________________________________________________________________
// Encoding and decoding of freevar information
fn encode_freevar_entry(ebml_w: ebml::writer, fv: freevar_entry) {
astencode_gen::serialize_middle_freevars_freevar_entry(ebml_w, fv)
}
impl helper for serialization::ebml_deserializer {
fn read_freevar_entry(xcx: extended_decode_ctxt) -> freevar_entry {
let fv =
astencode_gen::deserialize_middle_freevars_freevar_entry(self);
fv.tr(xcx)
}
}
impl of tr for freevar_entry {
fn tr(xcx: extended_decode_ctxt) -> freevar_entry {
{def: self.def.tr(xcx), span: self.span.tr(xcx)}
}
}
// ______________________________________________________________________
// Encoding and decoding of method_origin
fn encode_method_origin(ebml_w: ebml::writer, mo: method_origin) {
astencode_gen::serialize_middle_typeck_method_origin(ebml_w, mo)
}
impl helper for serialization::ebml_deserializer {
fn read_method_origin(xcx: extended_decode_ctxt) -> method_origin {
let fv = astencode_gen::deserialize_middle_typeck_method_origin(self);
fv.tr(xcx)
}
}
impl of tr for method_origin {
fn tr(xcx: extended_decode_ctxt) -> method_origin {
alt self {
typeck::method_static(did) {
typeck::method_static(did.tr(xcx))
}
typeck::method_param(did, m, p, b) {
typeck::method_param(did.tr(xcx), m, p, b)
}
typeck::method_iface(did, m) {
typeck::method_iface(did.tr(xcx), m)
}
}
}
}
// ______________________________________________________________________
// Encoding and decoding dict_res
fn encode_dict_res(ecx: @e::encode_ctxt,
ebml_w: ebml::writer,
dr: typeck::dict_res) {
// can't autogenerate this code because automatic serialization of
// ty::t doesn't work, and there is no way (atm) to have
// hand-written serialization routines combine with auto-generated
// ones. perhaps we should fix this.
ebml_w.emit_from_vec(*dr) {|dict_origin|
encode_dict_origin(ecx, ebml_w, dict_origin)
}
}
fn encode_dict_origin(ecx: @e::encode_ctxt,
ebml_w: ebml::writer,
dict_origin: typeck::dict_origin) {
ebml_w.emit_enum("dict_origin") {||
alt dict_origin {
typeck::dict_static(def_id, tys, dict_res) {
ebml_w.emit_enum_variant("dict_static", 0u, 3u) {||
ebml_w.emit_enum_variant_arg(0u) {||
ebml_w.emit_def_id(def_id)
}
ebml_w.emit_enum_variant_arg(1u) {||
ebml_w.emit_tys(ecx, tys);
}
ebml_w.emit_enum_variant_arg(2u) {||
encode_dict_res(ecx, ebml_w, dict_res);
}
}
}
typeck::dict_param(pn, bn) {
ebml_w.emit_enum_variant("dict_param", 1u, 2u) {||
ebml_w.emit_enum_variant_arg(0u) {||
ebml_w.emit_uint(pn);
}
ebml_w.emit_enum_variant_arg(1u) {||
ebml_w.emit_uint(bn);
}
}
}
typeck::dict_iface(def_id) {
ebml_w.emit_enum_variant("dict_iface", 1u, 3u) {||
ebml_w.emit_enum_variant_arg(0u) {||
ebml_w.emit_def_id(def_id)
}
}
}
}
}
}
impl helpers for serialization::ebml_deserializer {
fn read_dict_res(xcx: extended_decode_ctxt) -> typeck::dict_res {
@self.read_to_vec {|| self.read_dict_origin(xcx) }
}
fn read_dict_origin(xcx: extended_decode_ctxt) -> typeck::dict_origin {
self.read_enum("dict_origin") {||
self.read_enum_variant {|i|
alt check i {
0u {
typeck::dict_static(
self.read_enum_variant_arg(0u) {||
self.read_def_id(xcx)
},
self.read_enum_variant_arg(1u) {||
self.read_tys(xcx)
},
self.read_enum_variant_arg(2u) {||
self.read_dict_res(xcx)
}
)
}
1u {
typeck::dict_param(
self.read_enum_variant_arg(0u) {||
self.read_uint()
},
self.read_enum_variant_arg(1u) {||
self.read_uint()
}
)
}
2u {
typeck::dict_iface(
self.read_enum_variant_arg(0u) {||
self.read_def_id(xcx)
}
)
}
}
}
}
}
}
// ______________________________________________________________________
// Encoding and decoding the side tables
impl helpers for @e::encode_ctxt {
fn ty_str_ctxt() -> @tyencode::ctxt {
@{ds: e::def_to_str,
tcx: self.ccx.tcx,
abbrevs: tyencode::ac_use_abbrevs(self.type_abbrevs)}
}
}
impl helpers for ebml::writer {
fn emit_ty(ecx: @e::encode_ctxt, ty: ty::t) {
e::write_type(ecx, self, ty)
}
fn emit_tys(ecx: @e::encode_ctxt, tys: [ty::t]) {
self.emit_from_vec(tys) {|ty|
e::write_type(ecx, self, ty)
}
}
fn emit_bounds(ecx: @e::encode_ctxt, bs: ty::param_bounds) {
tyencode::enc_bounds(self.writer, ecx.ty_str_ctxt(), bs)
}
fn emit_tpbt(ecx: @e::encode_ctxt, tpbt: ty::ty_param_bounds_and_ty) {
self.emit_rec {||
self.emit_rec_field("bounds", 0u) {||
self.emit_from_vec(*tpbt.bounds) {|bs|
self.emit_bounds(ecx, bs)
}
}
self.emit_rec_field("ty", 0u) {||
self.emit_ty(ecx, tpbt.ty);
}
}
}
}
impl writer for ebml::writer {
fn tag(tag_id: c::astencode_tag, f: fn()) {
self.wr_tag(tag_id as uint) {|| f() }
}
fn id(id: ast::node_id) {
self.wr_tagged_u64(c::tag_table_id as uint, id as u64)
}
}
fn encode_side_tables_for_item(ecx: @e::encode_ctxt,
ebml_w: ebml::writer,
item: @ast::item) {
ebml_w.wr_tag(c::tag_table as uint) {||
visit_ids(item, fn@(id: ast::node_id) {
// Note: this will cause a copy of ebml_w, which is bad as
// it has mutable fields. But I believe it's harmless since
// we generate balanced EBML.
encode_side_tables_for_id(ecx, ebml_w, id)
});
}
}
fn encode_side_tables_for_id(ecx: @e::encode_ctxt,
ebml_w: ebml::writer,
id: ast::node_id) {
let ccx = ecx.ccx;
let tcx = ccx.tcx;
#debug["Encoding side tables for id %d", id];
option::may(tcx.def_map.find(id)) {|def|
ebml_w.tag(c::tag_table_def) {||
ebml_w.id(id);
ebml_w.tag(c::tag_table_val) {||
astencode_gen::serialize_syntax_ast_def(ebml_w, def)
}
}
}
option::may((*tcx.node_types).find(id as uint)) {|ty|
ebml_w.tag(c::tag_table_node_type) {||
ebml_w.id(id);
ebml_w.tag(c::tag_table_val) {||
e::write_type(ecx, ebml_w, ty)
}
}
}
option::may(tcx.node_type_substs.find(id)) {|tys|
ebml_w.tag(c::tag_table_node_type_subst) {||
ebml_w.id(id);
ebml_w.tag(c::tag_table_val) {||
ebml_w.emit_tys(ecx, tys)
}
}
}
option::may(tcx.freevars.find(id)) {|fv|
ebml_w.tag(c::tag_table_freevars) {||
ebml_w.id(id);
ebml_w.tag(c::tag_table_val) {||
ebml_w.emit_from_vec(*fv) {|fv_entry|
encode_def(ebml_w, fv_entry.def);
}
}
}
}
let lid = {crate: ast::local_crate, node: id};
option::may(tcx.tcache.find(lid)) {|tpbt|
ebml_w.tag(c::tag_table_tcache) {||
ebml_w.id(id);
ebml_w.tag(c::tag_table_val) {||
ebml_w.emit_tpbt(ecx, tpbt);
}
}
}
option::may(tcx.ty_param_bounds.find(id)) {|pbs|
ebml_w.tag(c::tag_table_param_bounds) {||
ebml_w.id(id);
ebml_w.tag(c::tag_table_val) {||
ebml_w.emit_bounds(ecx, pbs)
}
}
}
// I believe it is not necessary to encode this information. The
// ids will appear in the AST but in the *type* information, which
// is what we actually use in trans, all modes will have been
// resolved.
//
//option::may(tcx.inferred_modes.find(id)) {|m|
// ebml_w.tag(c::tag_table_inferred_modes) {||
// ebml_w.id(id);
// ebml_w.tag(c::tag_table_val) {||
// tyencode::enc_mode(ebml_w.writer, ty_str_ctxt(), m);
// }
// }
//}
option::may(ccx.maps.mutbl_map.find(id)) {|_m|
ebml_w.tag(c::tag_table_mutbl) {||
ebml_w.id(id);
}
}
option::may(ccx.maps.copy_map.find(id)) {|_m|
ebml_w.tag(c::tag_table_copy) {||
ebml_w.id(id);
}
}
option::may(ccx.maps.last_uses.find(id)) {|_m|
ebml_w.tag(c::tag_table_last_use) {||
ebml_w.id(id);
}
}
// impl_map is not used except when emitting metadata,
// don't need to keep it.
option::may(ccx.maps.method_map.find(id)) {|mo|
ebml_w.tag(c::tag_table_method_map) {||
ebml_w.id(id);
ebml_w.tag(c::tag_table_val) {||
astencode_gen::
serialize_middle_typeck_method_origin(ebml_w, mo)
}
}
}
option::may(ccx.maps.dict_map.find(id)) {|dr|
ebml_w.tag(c::tag_table_dict_map) {||
ebml_w.id(id);
ebml_w.tag(c::tag_table_val) {||
encode_dict_res(ecx, ebml_w, dr);
}
}
}
}
impl decoder for ebml::doc {
fn as_int() -> int { ebml::doc_as_u64(self) as int }
fn [](tag: c::astencode_tag) -> ebml::doc {
ebml::get_doc(self, tag as uint)
}
fn opt_child(tag: c::astencode_tag) -> option<ebml::doc> {
ebml::maybe_get_doc(self, tag as uint)
}
}
impl decoder for serialization::ebml_deserializer {
fn read_ty(xcx: extended_decode_ctxt) -> ty::t {
tydecode::parse_ty_data(
self.parent.data, xcx.dcx.cdata.cnum, self.pos, xcx.dcx.tcx,
xcx.tr_def_id(_))
}
fn read_tys(xcx: extended_decode_ctxt) -> [ty::t] {
self.read_to_vec {|| self.read_ty(xcx) }
}
fn read_bounds(xcx: extended_decode_ctxt) -> @[ty::param_bound] {
tydecode::parse_bounds_data(
self.parent.data, self.pos, xcx.dcx.cdata.cnum, xcx.dcx.tcx,
xcx.tr_def_id(_))
}
fn read_ty_param_bounds_and_ty(xcx: extended_decode_ctxt)
-> ty::ty_param_bounds_and_ty {
self.read_rec {||
{
bounds: self.read_rec_field("bounds", 0u) {||
@self.read_to_vec {|| self.read_bounds(xcx) }
},
ty: self.read_rec_field("ty", 1u) {||
self.read_ty(xcx)
}
}
}
}
}
fn decode_side_tables(xcx: extended_decode_ctxt,
ast_doc: ebml::doc) {
let dcx = xcx.dcx;
let tbl_doc = ast_doc[c::tag_table];
ebml::docs(tbl_doc) {|tag, entry_doc|
let id0 = entry_doc[c::tag_table_id].as_int();
let id = xcx.tr_id(id0);
#debug["side table document with tag 0x%x found for id %d (orig %d)",
tag, id, id0];
if tag == (c::tag_table_mutbl as uint) {
dcx.maps.mutbl_map.insert(id, ());
} else if tag == (c::tag_table_copy as uint) {
dcx.maps.copy_map.insert(id, ());
} else if tag == (c::tag_table_last_use as uint) {
dcx.maps.last_uses.insert(id, ());
} else {
let val_doc = entry_doc[c::tag_table_val];
let val_dsr = serialization::mk_ebml_deserializer(val_doc);
if tag == (c::tag_table_def as uint) {
let def = decode_def(xcx, val_doc);
dcx.tcx.def_map.insert(id, def);
} else if tag == (c::tag_table_node_type as uint) {
let ty = val_dsr.read_ty(xcx);
(*dcx.tcx.node_types).insert(id as uint, ty);
} else if tag == (c::tag_table_node_type_subst as uint) {
let tys = val_dsr.read_tys(xcx);
dcx.tcx.node_type_substs.insert(id, tys);
} else if tag == (c::tag_table_freevars as uint) {
let fv_info = @val_dsr.read_to_vec {||
@val_dsr.read_freevar_entry(xcx)
};
dcx.tcx.freevars.insert(id, fv_info);
} else if tag == (c::tag_table_tcache as uint) {
let tpbt = val_dsr.read_ty_param_bounds_and_ty(xcx);
let lid = {crate: ast::local_crate, node: id};
dcx.tcx.tcache.insert(lid, tpbt);
} else if tag == (c::tag_table_param_bounds as uint) {
let bounds = val_dsr.read_bounds(xcx);
dcx.tcx.ty_param_bounds.insert(id, bounds);
} else if tag == (c::tag_table_method_map as uint) {
dcx.maps.method_map.insert(id,
val_dsr.read_method_origin(xcx));
} else if tag == (c::tag_table_dict_map as uint) {
dcx.maps.dict_map.insert(id,
val_dsr.read_dict_res(xcx));
} else {
xcx.dcx.tcx.sess.bug(
#fmt["Unknown tag found in side tables: %x", tag]);
}
}
}
}
// ______________________________________________________________________
// Testing
#[cfg(test)]
fn new_parse_sess() -> parser::parse_sess {
let cm = codemap::new_codemap();
let handler = diagnostic::mk_handler(option::none);
let sess = @{
cm: cm,
mutable next_id: 1,
span_diagnostic: diagnostic::mk_span_handler(handler, cm),
mutable chpos: 0u,
mutable byte_pos: 0u
};
ret sess;
}
#[cfg(test)]
iface fake_ext_ctxt {
fn session() -> fake_session;
}
#[cfg(test)]
type fake_options = {cfg: ast::crate_cfg};
#[cfg(test)]
type fake_session = {opts: @fake_options,
parse_sess: parser::parse_sess};
#[cfg(test)]
impl of fake_ext_ctxt for fake_session {
fn session() -> fake_session {self}
}
#[cfg(test)]
fn mk_ctxt() -> fake_ext_ctxt {
let opts : fake_options = {cfg: []};
{opts: @opts, parse_sess: new_parse_sess()} as fake_ext_ctxt
}
#[cfg(test)]
fn roundtrip(in_item: @ast::item) {
#debug["in_item = %s", pprust::item_to_str(in_item)];
let mbuf = io::mk_mem_buffer();
let ebml_w = ebml::mk_writer(io::mem_buffer_writer(mbuf));
encode_ast(ebml_w, in_item);
let ebml_doc = ebml::new_doc(@io::mem_buffer_buf(mbuf));
let out_item = decode_ast(ebml_doc);
#debug["out_item = %s", pprust::item_to_str(out_item)];
assert in_item == out_item;
}
#[test]
fn test_basic() {
let ext_cx = mk_ctxt();
roundtrip(#ast(item){
fn foo() {}
});
}
#[test]
fn test_smalltalk() {
let ext_cx = mk_ctxt();
roundtrip(#ast(item){
fn foo() -> int { 3 + 4 } // first smalltalk program ever executed.
});
}
#[test]
fn test_more() {
let ext_cx = mk_ctxt();
roundtrip(#ast(item){
fn foo(x: uint, y: uint) -> uint {
let z = x + y;
ret z;
}
});
}