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rewrite metadata indexing

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this improves the compilation time for small crates by ~20%
This commit is contained in:
Ariel Ben-Yehuda 2015-09-03 01:22:31 +03:00
parent fcad49e416
commit cde09e7ca3
9 changed files with 322 additions and 244 deletions
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1
src/librustc/lib.rs
View File

@ -51,7 +51,6 @@
#![feature(rustc_diagnostic_macros)]
#![feature(rustc_private)]
#![feature(scoped_tls)]
#![feature(slice_bytes)]
#![feature(slice_splits)]
#![feature(slice_patterns)]
#![feature(staged_api)]

8
src/librustc/metadata/common.rs
View File

@ -45,13 +45,7 @@ pub const tag_items_data_item_is_tuple_struct_ctor: usize = 0x29;
pub const tag_index: usize = 0x2a;
pub const tag_index_buckets: usize = 0x2b;
pub const tag_index_buckets_bucket: usize = 0x2c;
pub const tag_index_buckets_bucket_elt: usize = 0x2d;
pub const tag_index_table: usize = 0x2e;
// GAP 0x2b, 0x2c, 0x2d, 0x2e
pub const tag_meta_item_name_value: usize = 0x2f;

3
src/librustc/metadata/creader.rs
View File

@ -304,6 +304,7 @@ impl<'a> CrateReader<'a> {
let cmeta = Rc::new(cstore::crate_metadata {
name: name.to_string(),
local_path: RefCell::new(SmallVector::zero()),
index: decoder::load_index(metadata.as_slice()),
data: metadata,
cnum_map: RefCell::new(cnum_map),
cnum: cnum,
@ -521,7 +522,7 @@ impl<'a> CrateReader<'a> {
}
let registrar = decoder::get_plugin_registrar_fn(ekrate.metadata.as_slice())
.map(|id| decoder::get_symbol(ekrate.metadata.as_slice(), id));
.map(|id| decoder::get_symbol_from_buf(ekrate.metadata.as_slice(), id));
match (ekrate.dylib.as_ref(), registrar) {
(Some(dylib), Some(reg)) => Some((dylib.to_path_buf(), reg)),

36
src/librustc/metadata/csearch.rs
View File

@ -11,23 +11,18 @@
// Searching for information from the cstore
use front::map as ast_map;
use metadata::common::*;
use metadata::cstore;
use metadata::decoder;
use metadata::inline::InlinedItem;
use middle::def_id::DefId;
use middle::lang_items;
use middle::ty;
use util::nodemap::FnvHashMap;
use rbml;
use rbml::reader;
use std::rc::Rc;
use syntax::ast;
use rustc_front::attr;
use rustc_front::hir;
use syntax::diagnostic::expect;
use std::collections::hash_map::HashMap;
#[derive(Copy, Clone)]
pub struct MethodInfo {
@ -38,7 +33,7 @@ pub struct MethodInfo {
pub fn get_symbol(cstore: &cstore::CStore, def: DefId) -> String {
let cdata = cstore.get_crate_data(def.krate);
decoder::get_symbol(cdata.data(), def.node)
decoder::get_symbol(&cdata, def.node)
}
/// Iterates over all the language items in the given crate.
@ -201,7 +196,7 @@ pub fn get_struct_field_names(cstore: &cstore::CStore, def: DefId) -> Vec<ast::N
decoder::get_struct_field_names(&cstore.intr, &*cdata, def.node)
}
pub fn get_struct_field_attrs(cstore: &cstore::CStore, def: DefId) -> HashMap<ast::NodeId,
pub fn get_struct_field_attrs(cstore: &cstore::CStore, def: DefId) -> FnvHashMap<ast::NodeId,
Vec<hir::Attribute>> {
let cdata = cstore.get_crate_data(def.krate);
decoder::get_struct_field_attrs(&*cdata)
@ -243,31 +238,6 @@ pub fn get_super_predicates<'tcx>(tcx: &ty::ctxt<'tcx>, def: DefId)
decoder::get_super_predicates(&*cdata, def.node, tcx)
}
pub fn get_field_type<'tcx>(tcx: &ty::ctxt<'tcx>, class_id: DefId,
def: DefId) -> ty::TypeScheme<'tcx> {
let cstore = &tcx.sess.cstore;
let cdata = cstore.get_crate_data(class_id.krate);
let all_items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_items);
let class_doc = expect(tcx.sess.diagnostic(),
decoder::maybe_find_item(class_id.node, all_items),
|| {
(format!("get_field_type: class ID {:?} not found",
class_id)).to_string()
});
let the_field = expect(tcx.sess.diagnostic(),
decoder::maybe_find_item(def.node, class_doc),
|| {
(format!("get_field_type: in class {:?}, field ID {:?} not found",
class_id,
def)).to_string()
});
let ty = decoder::item_type(def, the_field, tcx, &*cdata);
ty::TypeScheme {
generics: ty::Generics::empty(),
ty: ty,
}
}
pub fn get_impl_polarity<'tcx>(tcx: &ty::ctxt<'tcx>,
def: DefId)
-> Option<hir::ImplPolarity>

3
src/librustc/metadata/cstore.rs
View File

@ -18,7 +18,7 @@ pub use self::LinkagePreference::*;
pub use self::NativeLibraryKind::*;
use back::svh::Svh;
use metadata::{creader, decoder, loader};
use metadata::{creader, decoder, index, loader};
use session::search_paths::PathKind;
use util::nodemap::{FnvHashMap, NodeMap, NodeSet};
@ -65,6 +65,7 @@ pub struct crate_metadata {
pub codemap_import_info: RefCell<Vec<ImportedFileMap>>,
pub span: codemap::Span,
pub staged_api: bool,
pub index: index::Index,
/// Flag if this crate is required by an rlib version of this crate, or in
/// other words whether it was explicitly linked to. An example of a crate

187
src/librustc/metadata/decoder.rs
View File

@ -26,6 +26,7 @@ use metadata::csearch::MethodInfo;
use metadata::csearch;
use metadata::cstore;
use metadata::encoder::def_to_u64;
use metadata::index;
use metadata::inline::InlinedItem;
use metadata::tydecode::TyDecoder;
use middle::def;
@ -37,12 +38,9 @@ use middle::ty::{self, RegionEscape, Ty};
use util::nodemap::FnvHashMap;
use std::cell::{Cell, RefCell};
use std::collections::HashMap;
use std::hash::{Hash, SipHasher, Hasher};
use std::io::prelude::*;
use std::io;
use std::rc::Rc;
use std::slice::bytes;
use std::str;
use rbml::reader;
@ -59,57 +57,24 @@ use syntax::ptr::P;
pub type Cmd<'a> = &'a crate_metadata;
// A function that takes a def_id relative to the crate being searched and
// returns a def_id relative to the compilation environment, i.e. if we hit a
// def_id for an item defined in another crate, somebody needs to figure out
// what crate that's in and give us a def_id that makes sense for the current
// build.
fn u32_from_be_bytes(bytes: &[u8]) -> u32 {
let mut b = [0; 4];
bytes::copy_memory(&bytes[..4], &mut b);
unsafe { (*(b.as_ptr() as *const u32)).to_be() }
}
fn lookup_hash<'a, F>(d: rbml::Doc<'a>, mut eq_fn: F, hash: u64) -> Option<rbml::Doc<'a>> where
F: FnMut(&[u8]) -> bool,
{
let index = reader::get_doc(d, tag_index);
let table = reader::get_doc(index, tag_index_table);
let hash_pos = table.start + (hash % 256 * 4) as usize;
let pos = u32_from_be_bytes(&d.data[hash_pos..]) as usize;
let tagged_doc = reader::doc_at(d.data, pos).unwrap();
reader::tagged_docs(tagged_doc.doc, tag_index_buckets_bucket_elt).find(|elt| {
eq_fn(&elt.data[elt.start + 4 .. elt.end])
}).map(|elt| {
let pos = u32_from_be_bytes(&elt.data[elt.start..]) as usize;
reader::doc_at(d.data, pos).unwrap().doc
})
}
pub fn maybe_find_item<'a>(item_id: ast::NodeId,
items: rbml::Doc<'a>) -> Option<rbml::Doc<'a>> {
fn eq_item(bytes: &[u8], item_id: ast::NodeId) -> bool {
u32_from_be_bytes(bytes) == item_id
impl crate_metadata {
fn get_item(&self, item_id: ast::NodeId) -> Option<rbml::Doc> {
self.index.lookup_item(self.data(), item_id).map(|pos| {
reader::doc_at(self.data(), pos as usize).unwrap().doc
})
}
let mut s = SipHasher::new_with_keys(0, 0);
(item_id as i64).hash(&mut s);
lookup_hash(items, |a| eq_item(a, item_id), s.finish())
}
fn find_item<'a>(item_id: ast::NodeId, items: rbml::Doc<'a>) -> rbml::Doc<'a> {
match maybe_find_item(item_id, items) {
None => panic!("lookup_item: id not found: {}", item_id),
Some(d) => d
fn lookup_item(&self, item_id: ast::NodeId) -> rbml::Doc {
match self.get_item(item_id) {
None => panic!("lookup_item: id not found: {}", item_id),
Some(d) => d
}
}
}
// Looks up an item in the given metadata and returns an rbml doc pointing
// to the item data.
fn lookup_item<'a>(item_id: ast::NodeId, data: &'a [u8]) -> rbml::Doc<'a> {
let items = reader::get_doc(rbml::Doc::new(data), tag_items);
find_item(item_id, items)
pub fn load_index(data: &[u8]) -> index::Index {
let index = reader::get_doc(rbml::Doc::new(data), tag_index);
index::Index::from_buf(index.data, index.start, index.end)
}
#[derive(Debug, PartialEq)]
@ -380,7 +345,7 @@ pub fn get_trait_def<'tcx>(cdata: Cmd,
item_id: ast::NodeId,
tcx: &ty::ctxt<'tcx>) -> ty::TraitDef<'tcx>
{
let item_doc = lookup_item(item_id, cdata.data());
let item_doc = cdata.lookup_item(item_id);
let generics = doc_generics(item_doc, tcx, cdata, tag_item_generics);
let unsafety = parse_unsafety(item_doc);
let associated_type_names = parse_associated_type_names(item_doc);
@ -410,7 +375,7 @@ pub fn get_adt_def<'tcx>(intr: &IdentInterner,
let mut disr_val = 0;
reader::tagged_docs(doc, tag_items_data_item_variant).map(|p| {
let did = translated_def_id(cdata, p);
let item = lookup_item(did.node, cdata.data());
let item = cdata.lookup_item(did.node);
if let Some(disr) = variant_disr_val(item) {
disr_val = disr;
@ -459,7 +424,7 @@ pub fn get_adt_def<'tcx>(intr: &IdentInterner,
}
}
let doc = lookup_item(item_id, cdata.data());
let doc = cdata.lookup_item(item_id);
let did = DefId { krate: cdata.cnum, node: item_id };
let (kind, variants) = match item_family(doc) {
Enum => (ty::AdtKind::Enum,
@ -516,7 +481,7 @@ pub fn get_predicates<'tcx>(cdata: Cmd,
tcx: &ty::ctxt<'tcx>)
-> ty::GenericPredicates<'tcx>
{
let item_doc = lookup_item(item_id, cdata.data());
let item_doc = cdata.lookup_item(item_id);
doc_predicates(item_doc, tcx, cdata, tag_item_generics)
}
@ -525,14 +490,14 @@ pub fn get_super_predicates<'tcx>(cdata: Cmd,
tcx: &ty::ctxt<'tcx>)
-> ty::GenericPredicates<'tcx>
{
let item_doc = lookup_item(item_id, cdata.data());
let item_doc = cdata.lookup_item(item_id);
doc_predicates(item_doc, tcx, cdata, tag_item_super_predicates)
}
pub fn get_type<'tcx>(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt<'tcx>)
-> ty::TypeScheme<'tcx>
{
let item_doc = lookup_item(id, cdata.data());
let item_doc = cdata.lookup_item(id);
let t = item_type(DefId { krate: cdata.cnum, node: id }, item_doc, tcx,
cdata);
let generics = doc_generics(item_doc, tcx, cdata, tag_item_generics);
@ -543,7 +508,7 @@ pub fn get_type<'tcx>(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt<'tcx>)
}
pub fn get_stability(cdata: Cmd, id: ast::NodeId) -> Option<attr::Stability> {
let item = lookup_item(id, cdata.data());
let item = cdata.lookup_item(id);
reader::maybe_get_doc(item, tag_items_data_item_stability).map(|doc| {
let mut decoder = reader::Decoder::new(doc);
Decodable::decode(&mut decoder).unwrap()
@ -551,7 +516,7 @@ pub fn get_stability(cdata: Cmd, id: ast::NodeId) -> Option<attr::Stability> {
}
pub fn get_repr_attrs(cdata: Cmd, id: ast::NodeId) -> Vec<attr::ReprAttr> {
let item = lookup_item(id, cdata.data());
let item = cdata.lookup_item(id);
match reader::maybe_get_doc(item, tag_items_data_item_repr).map(|doc| {
let mut decoder = reader::Decoder::new(doc);
Decodable::decode(&mut decoder).unwrap()
@ -565,7 +530,7 @@ pub fn get_impl_polarity<'tcx>(cdata: Cmd,
id: ast::NodeId)
-> Option<hir::ImplPolarity>
{
let item_doc = lookup_item(id, cdata.data());
let item_doc = cdata.lookup_item(id);
let fam = item_family(item_doc);
match fam {
Family::Impl => {
@ -578,7 +543,7 @@ pub fn get_impl_polarity<'tcx>(cdata: Cmd,
pub fn get_custom_coerce_unsized_kind<'tcx>(cdata: Cmd,
id: ast::NodeId)
-> Option<ty::CustomCoerceUnsized> {
let item_doc = lookup_item(id, cdata.data());
let item_doc = cdata.lookup_item(id);
reader::maybe_get_doc(item_doc, tag_impl_coerce_unsized_kind).map(|kind_doc| {
let mut decoder = reader::Decoder::new(kind_doc);
Decodable::decode(&mut decoder).unwrap()
@ -590,7 +555,7 @@ pub fn get_impl_trait<'tcx>(cdata: Cmd,
tcx: &ty::ctxt<'tcx>)
-> Option<ty::TraitRef<'tcx>>
{
let item_doc = lookup_item(id, cdata.data());
let item_doc = cdata.lookup_item(id);
let fam = item_family(item_doc);
match fam {
Family::Impl | Family::DefaultImpl => {
@ -602,8 +567,16 @@ pub fn get_impl_trait<'tcx>(cdata: Cmd,
}
}
pub fn get_symbol(data: &[u8], id: ast::NodeId) -> String {
return item_symbol(lookup_item(id, data));
pub fn get_symbol(cdata: Cmd, id: ast::NodeId) -> String {
return item_symbol(cdata.lookup_item(id));
}
/// If you have a crate_metadata, call get_symbol instead
pub fn get_symbol_from_buf(data: &[u8], id: ast::NodeId) -> String {
let index = load_index(data);
let pos = index.lookup_item(data, id).unwrap();
let doc = reader::doc_at(data, pos as usize).unwrap().doc;
item_symbol(doc)
}
// Something that a name can resolve to.
@ -655,10 +628,8 @@ fn each_child_of_item_or_crate<F, G>(intr: Rc<IdentInterner>,
None => cdata
};
let other_crates_items = reader::get_doc(rbml::Doc::new(crate_data.data()), tag_items);
// Get the item.
match maybe_find_item(child_def_id.node, other_crates_items) {
match crate_data.get_item(child_def_id.node) {
None => {}
Some(child_item_doc) => {
// Hand off the item to the callback.
@ -676,13 +647,12 @@ fn each_child_of_item_or_crate<F, G>(intr: Rc<IdentInterner>,
for inherent_impl_def_id_doc in reader::tagged_docs(item_doc,
tag_items_data_item_inherent_impl) {
let inherent_impl_def_id = item_def_id(inherent_impl_def_id_doc, cdata);
let items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_items);
if let Some(inherent_impl_doc) = maybe_find_item(inherent_impl_def_id.node, items) {
if let Some(inherent_impl_doc) = cdata.get_item(inherent_impl_def_id.node) {
for impl_item_def_id_doc in reader::tagged_docs(inherent_impl_doc,
tag_item_impl_item) {
let impl_item_def_id = item_def_id(impl_item_def_id_doc,
cdata);
if let Some(impl_method_doc) = maybe_find_item(impl_item_def_id.node, items) {
if let Some(impl_method_doc) = cdata.get_item(impl_item_def_id.node) {
if let StaticMethod = item_family(impl_method_doc) {
// Hand off the static method to the callback.
let static_method_name = item_name(&*intr, impl_method_doc);
@ -717,10 +687,8 @@ fn each_child_of_item_or_crate<F, G>(intr: Rc<IdentInterner>,
None => cdata
};
let other_crates_items = reader::get_doc(rbml::Doc::new(crate_data.data()), tag_items);
// Get the item.
if let Some(child_item_doc) = maybe_find_item(child_def_id.node, other_crates_items) {
if let Some(child_item_doc) = crate_data.get_item(child_def_id.node) {
// Hand off the item to the callback.
let def_like = item_to_def_like(crate_data, child_item_doc, child_def_id);
// These items have a public visibility because they're part of
@ -740,9 +708,7 @@ pub fn each_child_of_item<F, G>(intr: Rc<IdentInterner>,
G: FnMut(ast::CrateNum) -> Rc<crate_metadata>,
{
// Find the item.
let root_doc = rbml::Doc::new(cdata.data());
let items = reader::get_doc(root_doc, tag_items);
let item_doc = match maybe_find_item(id, items) {
let item_doc = match cdata.get_item(id) {
None => return,
Some(item_doc) => item_doc,
};
@ -775,11 +741,11 @@ pub fn each_top_level_item_of_crate<F, G>(intr: Rc<IdentInterner>,
}
pub fn get_item_path(cdata: Cmd, id: ast::NodeId) -> Vec<ast_map::PathElem> {
item_path(lookup_item(id, cdata.data()))
item_path(cdata.lookup_item(id))
}
pub fn get_item_name(intr: &IdentInterner, cdata: Cmd, id: ast::NodeId) -> ast::Name {
item_name(intr, lookup_item(id, cdata.data()))
item_name(intr, cdata.lookup_item(id))
}
pub type DecodeInlinedItem<'a> =
@ -793,14 +759,14 @@ pub fn maybe_get_item_ast<'tcx>(cdata: Cmd, tcx: &ty::ctxt<'tcx>, id: ast::NodeI
mut decode_inlined_item: DecodeInlinedItem)
-> csearch::FoundAst<'tcx> {
debug!("Looking up item: {}", id);
let item_doc = lookup_item(id, cdata.data());
let item_doc = cdata.lookup_item(id);
let path = item_path(item_doc).split_last().unwrap().1.to_vec();
match decode_inlined_item(cdata, tcx, path, item_doc) {
Ok(ii) => csearch::FoundAst::Found(ii),
Err(path) => {
match item_parent_item(cdata, item_doc) {
Some(did) => {
let parent_item = lookup_item(did.node, cdata.data());
let parent_item = cdata.lookup_item(did.node);
match decode_inlined_item(cdata, tcx, path, parent_item) {
Ok(ii) => csearch::FoundAst::FoundParent(did, ii),
Err(_) => csearch::FoundAst::NotFound
@ -842,7 +808,7 @@ fn get_explicit_self(item: rbml::Doc) -> ty::ExplicitSelfCategory {
/// Returns the def IDs of all the items in the given implementation.
pub fn get_impl_items(cdata: Cmd, impl_id: ast::NodeId)
-> Vec<ty::ImplOrTraitItemId> {
reader::tagged_docs(lookup_item(impl_id, cdata.data()), tag_item_impl_item).map(|doc| {
reader::tagged_docs(cdata.lookup_item(impl_id), tag_item_impl_item).map(|doc| {
let def_id = item_def_id(doc, cdata);
match item_sort(doc) {
Some('C') => ty::ConstTraitItemId(def_id),
@ -857,12 +823,12 @@ pub fn get_trait_name(intr: Rc<IdentInterner>,
cdata: Cmd,
id: ast::NodeId)
-> ast::Name {
let doc = lookup_item(id, cdata.data());
let doc = cdata.lookup_item(id);
item_name(&*intr, doc)
}
pub fn is_static_method(cdata: Cmd, id: ast::NodeId) -> bool {
let doc = lookup_item(id, cdata.data());
let doc = cdata.lookup_item(id);
match item_sort(doc) {
Some('r') | Some('p') => {
get_explicit_self(doc) == ty::StaticExplicitSelfCategory
@ -876,12 +842,12 @@ pub fn get_impl_or_trait_item<'tcx>(intr: Rc<IdentInterner>,
id: ast::NodeId,
tcx: &ty::ctxt<'tcx>)
-> ty::ImplOrTraitItem<'tcx> {
let item_doc = lookup_item(id, cdata.data());
let item_doc = cdata.lookup_item(id);
let def_id = item_def_id(item_doc, cdata);
let container_id = item_require_parent_item(cdata, item_doc);
let container_doc = lookup_item(container_id.node, cdata.data());
let container_doc = cdata.lookup_item(container_id.node);
let container = match item_family(container_doc) {
Trait => TraitContainer(container_id),
_ => ImplContainer(container_id),
@ -936,8 +902,7 @@ pub fn get_impl_or_trait_item<'tcx>(intr: Rc<IdentInterner>,
pub fn get_trait_item_def_ids(cdata: Cmd, id: ast::NodeId)
-> Vec<ty::ImplOrTraitItemId> {
let data = cdata.data();
let item = lookup_item(id, data);
let item = cdata.lookup_item(id);
reader::tagged_docs(item, tag_item_trait_item).map(|mth| {
let def_id = item_def_id(mth, cdata);
match item_sort(mth) {
@ -950,8 +915,7 @@ pub fn get_trait_item_def_ids(cdata: Cmd, id: ast::NodeId)
}
pub fn get_item_variances(cdata: Cmd, id: ast::NodeId) -> ty::ItemVariances {
let data = cdata.data();
let item_doc = lookup_item(id, data);
let item_doc = cdata.lookup_item(id);
let variance_doc = reader::get_doc(item_doc, tag_item_variances);
let mut decoder = reader::Decoder::new(variance_doc);
Decodable::decode(&mut decoder).unwrap()
@ -962,12 +926,11 @@ pub fn get_provided_trait_methods<'tcx>(intr: Rc<IdentInterner>,
id: ast::NodeId,
tcx: &ty::ctxt<'tcx>)
-> Vec<Rc<ty::Method<'tcx>>> {
let data = cdata.data();
let item = lookup_item(id, data);
let item = cdata.lookup_item(id);
reader::tagged_docs(item, tag_item_trait_item).filter_map(|mth_id| {
let did = item_def_id(mth_id, cdata);
let mth = lookup_item(did.node, data);
let mth = cdata.lookup_item(did.node);
if item_sort(mth) == Some('p') {
let trait_item = get_impl_or_trait_item(intr.clone(),
@ -990,13 +953,12 @@ pub fn get_associated_consts<'tcx>(intr: Rc<IdentInterner>,
id: ast::NodeId,
tcx: &ty::ctxt<'tcx>)
-> Vec<Rc<ty::AssociatedConst<'tcx>>> {
let data = cdata.data();
let item = lookup_item(id, data);
let item = cdata.lookup_item(id);
[tag_item_trait_item, tag_item_impl_item].iter().flat_map(|&tag| {
reader::tagged_docs(item, tag).filter_map(|ac_id| {
let did = item_def_id(ac_id, cdata);
let ac_doc = lookup_item(did.node, data);
let ac_doc = cdata.lookup_item(did.node);
if item_sort(ac_doc) == Some('C') {
let trait_item = get_impl_or_trait_item(intr.clone(),
@ -1017,7 +979,7 @@ pub fn get_associated_consts<'tcx>(intr: Rc<IdentInterner>,
pub fn get_type_name_if_impl(cdata: Cmd,
node_id: ast::NodeId) -> Option<ast::Name> {
let item = lookup_item(node_id, cdata.data());
let item = cdata.lookup_item(node_id);
if item_family(item) != Impl {
return None;
}
@ -1031,7 +993,7 @@ pub fn get_methods_if_impl(intr: Rc<IdentInterner>,
cdata: Cmd,
node_id: ast::NodeId)
-> Option<Vec<MethodInfo> > {
let item = lookup_item(node_id, cdata.data());
let item = cdata.lookup_item(node_id);
if item_family(item) != Impl {
return None;
}
@ -1046,7 +1008,7 @@ pub fn get_methods_if_impl(intr: Rc<IdentInterner>,
let mut impl_methods = Vec::new();
for impl_method_id in impl_method_ids {
let impl_method_doc = lookup_item(impl_method_id.node, cdata.data());
let impl_method_doc = cdata.lookup_item(impl_method_id.node);
let family = item_family(impl_method_doc);
match family {
StaticMethod | Method => {
@ -1069,7 +1031,7 @@ pub fn get_tuple_struct_definition_if_ctor(cdata: Cmd,
node_id: ast::NodeId)
-> Option<DefId>
{
let item = lookup_item(node_id, cdata.data());
let item = cdata.lookup_item(node_id);
reader::tagged_docs(item, tag_items_data_item_is_tuple_struct_ctor).next().map(|_| {
item_require_parent_item(cdata, item)
})
@ -1083,11 +1045,11 @@ pub fn get_item_attrs(cdata: Cmd,
// look at the definition
let node_id = get_tuple_struct_definition_if_ctor(cdata, orig_node_id);
let node_id = node_id.map(|x| x.node).unwrap_or(orig_node_id);
let item = lookup_item(node_id, cdata.data());
let item = cdata.lookup_item(node_id);
get_attributes(item)
}
pub fn get_struct_field_attrs(cdata: Cmd) -> HashMap<ast::NodeId, Vec<hir::Attribute>> {
pub fn get_struct_field_attrs(cdata: Cmd) -> FnvHashMap<ast::NodeId, Vec<hir::Attribute>> {
let data = rbml::Doc::new(cdata.data());
let fields = reader::get_doc(data, tag_struct_fields);
reader::tagged_docs(fields, tag_struct_field).map(|field| {
@ -1107,8 +1069,7 @@ fn struct_field_family_to_visibility(family: Family) -> hir::Visibility {
pub fn get_struct_field_names(intr: &IdentInterner, cdata: Cmd, id: ast::NodeId)
-> Vec<ast::Name> {
let data = cdata.data();
let item = lookup_item(id, data);
let item = cdata.lookup_item(id);
reader::tagged_docs(item, tag_item_field).map(|an_item| {
item_name(intr, an_item)
}).chain(reader::tagged_docs(item, tag_item_unnamed_field).map(|_| {
@ -1299,7 +1260,7 @@ pub fn each_inherent_implementation_for_type<F>(cdata: Cmd,
mut callback: F)
where F: FnMut(DefId),
{
let item_doc = lookup_item(id, cdata.data());
let item_doc = cdata.lookup_item(id);
for impl_doc in reader::tagged_docs(item_doc, tag_items_data_item_inherent_impl) {
if reader::maybe_get_doc(impl_doc, tag_item_trait_ref).is_none() {
callback(item_def_id(impl_doc, cdata));
@ -1313,7 +1274,7 @@ pub fn each_implementation_for_trait<F>(cdata: Cmd,
F: FnMut(DefId),
{
if cdata.cnum == def_id.krate {
let item_doc = lookup_item(def_id.node, cdata.data());
let item_doc = cdata.lookup_item(def_id.node);
for impl_doc in reader::tagged_docs(item_doc, tag_items_data_item_extension_impl) {
callback(item_def_id(impl_doc, cdata));
}
@ -1337,12 +1298,12 @@ pub fn each_implementation_for_trait<F>(cdata: Cmd,
pub fn get_trait_of_item(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt)
-> Option<DefId> {
let item_doc = lookup_item(id, cdata.data());
let item_doc = cdata.lookup_item(id);
let parent_item_id = match item_parent_item(cdata, item_doc) {
None => return None,
Some(item_id) => item_id,
};
let parent_item_doc = lookup_item(parent_item_id.node, cdata.data());
let parent_item_doc = cdata.lookup_item(parent_item_id.node);
match item_family(parent_item_doc) {
Trait => Some(item_def_id(parent_item_doc, cdata)),
Impl | DefaultImpl => {
@ -1423,7 +1384,7 @@ pub fn get_missing_lang_items(cdata: Cmd)
}
pub fn get_method_arg_names(cdata: Cmd, id: ast::NodeId) -> Vec<String> {
let method_doc = lookup_item(id, cdata.data());
let method_doc = cdata.lookup_item(id);
match reader::maybe_get_doc(method_doc, tag_method_argument_names) {
Some(args_doc) => {
reader::tagged_docs(args_doc, tag_method_argument_name).map(|name_doc| {
@ -1446,7 +1407,7 @@ pub fn get_reachable_ids(cdata: Cmd) -> Vec<DefId> {
}
pub fn is_typedef(cdata: Cmd, id: ast::NodeId) -> bool {
let item_doc = lookup_item(id, cdata.data());
let item_doc = cdata.lookup_item(id);
match item_family(item_doc) {
Type => true,
_ => false,
@ -1454,7 +1415,7 @@ pub fn is_typedef(cdata: Cmd, id: ast::NodeId) -> bool {
}
pub fn is_const_fn(cdata: Cmd, id: ast::NodeId) -> bool {
let item_doc = lookup_item(id, cdata.data());
let item_doc = cdata.lookup_item(id);
match fn_constness(item_doc) {
hir::Constness::Const => true,
hir::Constness::NotConst => false,
@ -1462,7 +1423,7 @@ pub fn is_const_fn(cdata: Cmd, id: ast::NodeId) -> bool {
}
pub fn is_impl(cdata: Cmd, id: ast::NodeId) -> bool {
let item_doc = lookup_item(id, cdata.data());
let item_doc = cdata.lookup_item(id);
match item_family(item_doc) {
Impl => true,
_ => false,
@ -1543,14 +1504,14 @@ fn doc_predicates<'tcx>(base_doc: rbml::Doc,
}
pub fn is_defaulted_trait(cdata: Cmd, trait_id: ast::NodeId) -> bool {
let trait_doc = lookup_item(trait_id, cdata.data());
let trait_doc = cdata.lookup_item(trait_id);
assert!(item_family(trait_doc) == Family::Trait);
let defaulted_doc = reader::get_doc(trait_doc, tag_defaulted_trait);
reader::doc_as_u8(defaulted_doc) != 0
}
pub fn is_default_impl(cdata: Cmd, impl_id: ast::NodeId) -> bool {
let impl_doc = lookup_item(impl_id, cdata.data());
let impl_doc = cdata.lookup_item(impl_id);
item_family(impl_doc) == Family::DefaultImpl
}
@ -1565,9 +1526,7 @@ pub fn get_imported_filemaps(metadata: &[u8]) -> Vec<codemap::FileMap> {
}
pub fn is_extern_fn(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt) -> bool {
let root_doc = rbml::Doc::new(cdata.data());
let items = reader::get_doc(root_doc, tag_items);
let item_doc = match maybe_find_item(id, items) {
let item_doc = match cdata.get_item(id) {
Some(doc) => doc,
None => return false,
};

119
src/librustc/metadata/encoder.rs
View File

@ -19,6 +19,7 @@ use metadata::common::*;
use metadata::cstore;
use metadata::decoder;
use metadata::tyencode;
use metadata::index::{self, IndexEntry};
use metadata::inline::InlinedItemRef;
use middle::def;
use middle::def_id::{DefId, LOCAL_CRATE};
@ -29,7 +30,6 @@ use util::nodemap::{FnvHashMap, NodeMap, NodeSet};
use serialize::Encodable;
use std::cell::RefCell;
use std::hash::{Hash, Hasher, SipHasher};
use std::io::prelude::*;
use std::io::{Cursor, SeekFrom};
use std::rc::Rc;
@ -86,12 +86,6 @@ fn encode_def_id(rbml_w: &mut Encoder, id: DefId) {
rbml_w.wr_tagged_u64(tag_def_id, def_to_u64(id));
}
#[derive(Clone)]
struct entry<T> {
val: T,
pos: u64
}
fn encode_trait_ref<'a, 'tcx>(rbml_w: &mut Encoder,
ecx: &EncodeContext<'a, 'tcx>,
trait_ref: ty::TraitRef<'tcx>,
@ -279,7 +273,7 @@ fn encode_enum_variant_info(ecx: &EncodeContext,
rbml_w: &mut Encoder,
id: NodeId,
vis: ast::Visibility,
index: &mut Vec<entry<i64>>) {
index: &mut Vec<IndexEntry>) {
debug!("encode_enum_variant_info(id={})", id);
let mut disr_val = 0;
@ -296,8 +290,8 @@ fn encode_enum_variant_info(ecx: &EncodeContext,
}
}
index.push(entry {
val: vid.node as i64,
index.push(IndexEntry {
node: vid.node,
pos: rbml_w.mark_stable_position(),
});
rbml_w.start_tag(tag_items_data_item);
@ -625,13 +619,13 @@ fn encode_provided_source(rbml_w: &mut Encoder,
fn encode_field<'a, 'tcx>(ecx: &EncodeContext<'a, 'tcx>,
rbml_w: &mut Encoder,
field: ty::FieldDef<'tcx>,
global_index: &mut Vec<entry<i64>>) {
global_index: &mut Vec<IndexEntry>) {
let nm = field.name;
let id = field.did.node;
let pos = rbml_w.mark_stable_position();
global_index.push(entry {
val: id as i64,
global_index.push(IndexEntry {
node: id,
pos: pos,
});
rbml_w.start_tag(tag_items_data_item);
@ -651,10 +645,10 @@ fn encode_info_for_struct_ctor(ecx: &EncodeContext,
rbml_w: &mut Encoder,
name: Name,
ctor_id: NodeId,
index: &mut Vec<entry<i64>>,
index: &mut Vec<IndexEntry>,
struct_id: NodeId) {
index.push(entry {
val: ctor_id as i64,
index.push(IndexEntry {
node: ctor_id,
pos: rbml_w.mark_stable_position(),
});
@ -989,15 +983,15 @@ fn encode_stability(rbml_w: &mut Encoder, stab_opt: Option<&attr::Stability>) {
fn encode_info_for_item(ecx: &EncodeContext,
rbml_w: &mut Encoder,
item: &ast::Item,
index: &mut Vec<entry<i64>>,
index: &mut Vec<IndexEntry>,
path: PathElems,
vis: ast::Visibility) {
let tcx = ecx.tcx;
fn add_to_index(item: &ast::Item, rbml_w: &mut Encoder,
index: &mut Vec<entry<i64>>) {
index.push(entry {
val: item.id as i64,
index: &mut Vec<IndexEntry>) {
index.push(IndexEntry {
node: item.id,
pos: rbml_w.mark_stable_position(),
});
}
@ -1261,8 +1255,8 @@ fn encode_info_for_item(ecx: &EncodeContext,
None
};
index.push(entry {
val: trait_item_def_id.def_id().node as i64,
index.push(IndexEntry {
node: trait_item_def_id.def_id().node,
pos: rbml_w.mark_stable_position(),
});
@ -1352,8 +1346,8 @@ fn encode_info_for_item(ecx: &EncodeContext,
for (i, &item_def_id) in r.iter().enumerate() {
assert_eq!(item_def_id.def_id().krate, LOCAL_CRATE);
index.push(entry {
val: item_def_id.def_id().node as i64,
index.push(IndexEntry {
node: item_def_id.def_id().node,
pos: rbml_w.mark_stable_position(),
});
@ -1474,11 +1468,11 @@ fn encode_info_for_item(ecx: &EncodeContext,
fn encode_info_for_foreign_item(ecx: &EncodeContext,
rbml_w: &mut Encoder,
nitem: &ast::ForeignItem,
index: &mut Vec<entry<i64>>,
index: &mut Vec<IndexEntry>,
path: PathElems,
abi: abi::Abi) {
index.push(entry {
val: nitem.id as i64,
index.push(IndexEntry {
node: nitem.id,
pos: rbml_w.mark_stable_position(),
});
@ -1522,7 +1516,7 @@ fn my_visit_expr(_e: &ast::Expr) { }
fn my_visit_item(i: &ast::Item,
rbml_w: &mut Encoder,
ecx: &EncodeContext,
index: &mut Vec<entry<i64>>) {
index: &mut Vec<IndexEntry>) {
ecx.tcx.map.with_path(i.id, |path| {
encode_info_for_item(ecx, rbml_w, i, index, path, i.vis);
});
@ -1531,7 +1525,7 @@ fn my_visit_item(i: &ast::Item,
fn my_visit_foreign_item(ni: &ast::ForeignItem,
rbml_w: &mut Encoder,
ecx: &EncodeContext,
index: &mut Vec<entry<i64>>) {
index: &mut Vec<IndexEntry>) {
debug!("writing foreign item {}::{}",
ecx.tcx.map.path_to_string(ni.id),
ni.ident);
@ -1547,7 +1541,7 @@ fn my_visit_foreign_item(ni: &ast::ForeignItem,
struct EncodeVisitor<'a, 'b:'a, 'c:'a, 'tcx:'c> {
rbml_w_for_visit_item: &'a mut Encoder<'b>,
ecx: &'a EncodeContext<'c,'tcx>,
index: &'a mut Vec<entry<i64>>,
index: &'a mut Vec<IndexEntry>,
}
impl<'a, 'b, 'c, 'tcx, 'v> Visitor<'v> for EncodeVisitor<'a, 'b, 'c, 'tcx> {
@ -1574,11 +1568,11 @@ impl<'a, 'b, 'c, 'tcx, 'v> Visitor<'v> for EncodeVisitor<'a, 'b, 'c, 'tcx> {
fn encode_info_for_items(ecx: &EncodeContext,
rbml_w: &mut Encoder,
krate: &ast::Crate)
-> Vec<entry<i64>> {
-> Vec<IndexEntry> {
let mut index = Vec::new();
rbml_w.start_tag(tag_items_data);
index.push(entry {
val: CRATE_NODE_ID as i64,
index.push(IndexEntry {
node: CRATE_NODE_ID,
pos: rbml_w.mark_stable_position(),
});
encode_info_for_mod(ecx,
@ -1601,62 +1595,13 @@ fn encode_info_for_items(ecx: &EncodeContext,
}
// Path and definition ID indexing
fn encode_index<T, F>(rbml_w: &mut Encoder, index: Vec<entry<T>>, mut write_fn: F) where
F: FnMut(&mut Cursor<Vec<u8>>, &T),
T: Hash,
fn encode_index(rbml_w: &mut Encoder, index: Vec<IndexEntry>)
{
let mut buckets: Vec<Vec<entry<T>>> = (0..256u16).map(|_| Vec::new()).collect();
for elt in index {
let mut s = SipHasher::new();
elt.val.hash(&mut s);
let h = s.finish() as usize;
(&mut buckets[h % 256]).push(elt);
}
rbml_w.start_tag(tag_index);
let mut bucket_locs = Vec::new();
rbml_w.start_tag(tag_index_buckets);
for bucket in &buckets {
bucket_locs.push(rbml_w.mark_stable_position());
rbml_w.start_tag(tag_index_buckets_bucket);
for elt in bucket {
rbml_w.start_tag(tag_index_buckets_bucket_elt);
assert!(elt.pos < 0xffff_ffff);
{
let wr: &mut Cursor<Vec<u8>> = rbml_w.writer;
write_be_u32(wr, elt.pos as u32);
}
write_fn(rbml_w.writer, &elt.val);
rbml_w.end_tag();
}
rbml_w.end_tag();
}
index::write_index(index, rbml_w.writer);
rbml_w.end_tag();
rbml_w.start_tag(tag_index_table);
for pos in &bucket_locs {
assert!(*pos < 0xffff_ffff);
let wr: &mut Cursor<Vec<u8>> = rbml_w.writer;
write_be_u32(wr, *pos as u32);
}
rbml_w.end_tag();
rbml_w.end_tag();
}
fn write_i64(writer: &mut Cursor<Vec<u8>>, &n: &i64) {
let wr: &mut Cursor<Vec<u8>> = writer;
assert!(n < 0x7fff_ffff);
write_be_u32(wr, n as u32);
}
fn write_be_u32(w: &mut Write, u: u32) {
w.write_all(&[
(u >> 24) as u8,
(u >> 16) as u8,
(u >> 8) as u8,
(u >> 0) as u8,
]);
}
fn encode_meta_item(rbml_w: &mut Encoder, mi: &ast::MetaItem) {
@ -2160,11 +2105,11 @@ fn encode_metadata_inner(wr: &mut Cursor<Vec<u8>>,
i = rbml_w.writer.seek(SeekFrom::Current(0)).unwrap();
let items_index = encode_info_for_items(&ecx, &mut rbml_w, krate);
stats.item_bytes = rbml_w.writer.seek(SeekFrom::Current(0)).unwrap() - i;
rbml_w.end_tag();
i = rbml_w.writer.seek(SeekFrom::Current(0)).unwrap();
encode_index(&mut rbml_w, items_index, write_i64);
encode_index(&mut rbml_w, items_index);
stats.index_bytes = rbml_w.writer.seek(SeekFrom::Current(0)).unwrap() - i;
rbml_w.end_tag();
encode_struct_field_attrs(&mut rbml_w, krate);

208
src/librustc/metadata/index.rs Normal file
View File

@ -0,0 +1,208 @@
// Copyright 2015 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.
use std::io::{Cursor, Write};
use std::slice;
use std::u32;
use syntax::ast::NodeId;
#[derive(Copy, Clone, PartialEq, PartialOrd, Eq, Ord)]
pub struct IndexEntry {
pub node: NodeId,
pub pos: u64
}
#[derive(Debug)]
pub struct IndexArrayEntry {
bits: u32,
first_pos: u32
}
impl IndexArrayEntry {
fn encode_to<W: Write>(&self, b: &mut W) {
write_be_u32(b, self.bits);
write_be_u32(b, self.first_pos);
}
fn decode_from(b: &[u32]) -> Self {
IndexArrayEntry {
bits: b[0].to_be(),
first_pos: b[1].to_be()
}
}
}
/// The Item Index
///
/// This index maps the NodeId of each item to its location in the
/// metadata.
///
/// The index is a sparse bit-vector consisting of a index-array
/// and a position-array. Each entry in the index-array handles 32 nodes.
/// The first word is a bit-array consisting of the nodes that hold items,
/// the second is the index of the first of the items in the position-array.
/// If there is a large set of non-item trailing nodes, they can be omitted
/// from the index-array.
///
/// The index is serialized as an array of big-endian 32-bit words.
/// The first word is the number of items in the position-array.
/// Then, for each item, its position in the metadata follows.
/// After that the index-array is stored.
///
/// struct index {
/// u32 item_count;
/// u32 items[self.item_count];
/// struct { u32 bits; u32 offset; } positions[..];
/// }
pub struct Index {
position_start: usize,
index_start: usize,
index_end: usize,
}
pub fn write_index(mut entries: Vec<IndexEntry>, buf: &mut Cursor<Vec<u8>>) {
assert!(entries.len() < u32::MAX as usize);
entries.sort();
let mut last_entry = IndexArrayEntry { bits: 0, first_pos: 0 };
write_be_u32(buf, entries.len() as u32);
for &IndexEntry { pos, .. } in &entries {
assert!(pos < u32::MAX as u64);
write_be_u32(buf, pos as u32);
}
let mut pos_in_index_array = 0;
for (i, &IndexEntry { node, .. }) in entries.iter().enumerate() {
let (x, s) = (node / 32 as u32, node % 32 as u32);
while x > pos_in_index_array {
pos_in_index_array += 1;
last_entry.encode_to(buf);
last_entry = IndexArrayEntry { bits: 0, first_pos: i as u32 };
}
last_entry.bits |= 1<<s;
}
last_entry.encode_to(buf);
info!("write_index: {} items, {} array entries",
entries.len(), pos_in_index_array);
}
impl Index {
fn lookup_index(&self, index: &[u32], i: u32) -> Option<IndexArrayEntry> {
let ix = (i as usize)*2;
if ix >= index.len() {
None
} else {
Some(IndexArrayEntry::decode_from(&index[ix..ix+2]))
}
}
fn item_from_pos(&self, positions: &[u32], pos: u32) -> u32 {
positions[pos as usize].to_be()
}
#[inline(never)]
pub fn lookup_item(&self, buf: &[u8], node: NodeId) -> Option<u32> {
let index = bytes_to_words(&buf[self.index_start..self.index_end]);
let positions = bytes_to_words(&buf[self.position_start..self.index_start]);
let (x, s) = (node / 32 as u32, node % 32 as u32);
let result = match self.lookup_index(index, x) {
Some(IndexArrayEntry { bits, first_pos }) => {
let bit = 1<<s;
if bits & bit == 0 {
None
} else {
let prev_nodes_for_entry = (bits&(bit-1)).count_ones();
Some(self.item_from_pos(
positions,
first_pos+prev_nodes_for_entry))
}
}
None => None // trailing zero
};
debug!("lookup_item({:?}) = {:?}", node, result);
result
}
pub fn from_buf(buf: &[u8], start: usize, end: usize) -> Self {
let buf = bytes_to_words(&buf[start..end]);
let position_count = buf[0].to_be() as usize;
let position_len = position_count*4;
info!("loaded index - position: {}-{}-{}", start, start+position_len, end);
debug!("index contents are {:?}",
buf.iter().map(|b| format!("{:08x}", b)).collect::<Vec<_>>().concat());
assert!(end-4-start >= position_len);
assert_eq!((end-4-start-position_len)%8, 0);
Index {
position_start: start+4,
index_start: start+position_len+4,
index_end: end
}
}
}
fn write_be_u32<W: Write>(w: &mut W, u: u32) {
let _ = w.write_all(&[
(u >> 24) as u8,
(u >> 16) as u8,
(u >> 8) as u8,
(u >> 0) as u8,
]);
}
fn bytes_to_words(b: &[u8]) -> &[u32] {
assert!(b.len() % 4 == 0);
unsafe { slice::from_raw_parts(b.as_ptr() as *const u32, b.len()/4) }
}
#[test]
fn test_index() {
let entries = vec![
IndexEntry { node: 0, pos: 17 },
IndexEntry { node: 31, pos: 29 },
IndexEntry { node: 32, pos: 1175 },
IndexEntry { node: 191, pos: 21 },
IndexEntry { node: 128, pos: 34 },
IndexEntry { node: 145, pos: 70 },
IndexEntry { node: 305, pos: 93214 },
IndexEntry { node: 138, pos: 64 },
IndexEntry { node: 129, pos: 53 },
IndexEntry { node: 192, pos: 33334 },
IndexEntry { node: 200, pos: 80123 },
];
let mut c = Cursor::new(vec![]);
write_index(entries.clone(), &mut c);
let mut buf = c.into_inner();
let expected: &[u8] = &[
0, 0, 0, 11, // # entries
// values:
0,0,0,17, 0,0,0,29, 0,0,4,151, 0,0,0,34,
0,0,0,53, 0,0,0,64, 0,0,0,70, 0,0,0,21,
0,0,130,54, 0,1,56,251, 0,1,108,30,
// index:
128,0,0,1,0,0,0,0, 0,0,0,1,0,0,0,2,
0,0,0,0,0,0,0,3, 0,0,0,0,0,0,0,3,
0,2,4,3,0,0,0,3, 128,0,0,0,0,0,0,7,
0,0,1,1,0,0,0,8, 0,0,0,0,0,0,0,10,
0,0,0,0,0,0,0,10, 0,2,0,0,0,0,0,10
];
assert_eq!(buf, expected);
// insert some junk padding
for i in 0..17 { buf.insert(0, i); buf.push(i) }
let index = Index::from_buf(&buf, 17, buf.len()-17);
// test round-trip
for i in 0..4096 {
assert_eq!(index.lookup_item(&buf, i),
entries.iter().find(|e| e.node == i).map(|n| n.pos as u32));
}
}

1
src/librustc/metadata/mod.rs
View File

@ -16,6 +16,7 @@ pub mod decoder;
pub mod creader;
pub mod cstore;
pub mod csearch;
pub mod index;
pub mod loader;
pub mod filesearch;
pub mod macro_import;