/
mono.rs
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/
mono.rs
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// Copyright 2017 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 hir::def_id::DefId;
use syntax::ast::NodeId;
use syntax::symbol::InternedString;
use ty::{Instance, TyCtxt};
use util::nodemap::FxHashMap;
use rustc_data_structures::base_n;
use rustc_data_structures::stable_hasher::{HashStable, StableHasherResult,
StableHasher};
use ich::{Fingerprint, StableHashingContext, NodeIdHashingMode};
use std::hash::Hash;
#[derive(PartialEq, Eq, Clone, Copy, Debug, Hash)]
pub enum MonoItem<'tcx> {
Fn(Instance<'tcx>),
Static(DefId),
GlobalAsm(NodeId),
}
impl<'tcx> MonoItem<'tcx> {
pub fn size_estimate<'a>(&self, tcx: &TyCtxt<'a, 'tcx, 'tcx>) -> usize {
match *self {
MonoItem::Fn(instance) => {
// Estimate the size of a function based on how many statements
// it contains.
tcx.instance_def_size_estimate(instance.def)
},
// Conservatively estimate the size of a static declaration
// or assembly to be 1.
MonoItem::Static(_) | MonoItem::GlobalAsm(_) => 1,
}
}
}
impl<'tcx> HashStable<StableHashingContext<'tcx>> for MonoItem<'tcx> {
fn hash_stable<W: StableHasherResult>(&self,
hcx: &mut StableHashingContext<'tcx>,
hasher: &mut StableHasher<W>) {
::std::mem::discriminant(self).hash_stable(hcx, hasher);
match *self {
MonoItem::Fn(ref instance) => {
instance.hash_stable(hcx, hasher);
}
MonoItem::Static(def_id) => {
def_id.hash_stable(hcx, hasher);
}
MonoItem::GlobalAsm(node_id) => {
hcx.with_node_id_hashing_mode(NodeIdHashingMode::HashDefPath, |hcx| {
node_id.hash_stable(hcx, hasher);
})
}
}
}
}
pub struct CodegenUnit<'tcx> {
/// A name for this CGU. Incremental compilation requires that
/// name be unique amongst **all** crates. Therefore, it should
/// contain something unique to this crate (e.g., a module path)
/// as well as the crate name and disambiguator.
name: InternedString,
items: FxHashMap<MonoItem<'tcx>, (Linkage, Visibility)>,
size_estimate: Option<usize>,
}
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
pub enum Linkage {
External,
AvailableExternally,
LinkOnceAny,
LinkOnceODR,
WeakAny,
WeakODR,
Appending,
Internal,
Private,
ExternalWeak,
Common,
}
impl_stable_hash_for!(enum self::Linkage {
External,
AvailableExternally,
LinkOnceAny,
LinkOnceODR,
WeakAny,
WeakODR,
Appending,
Internal,
Private,
ExternalWeak,
Common
});
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
pub enum Visibility {
Default,
Hidden,
Protected,
}
impl_stable_hash_for!(enum self::Visibility {
Default,
Hidden,
Protected
});
impl<'tcx> CodegenUnit<'tcx> {
pub fn new(name: InternedString) -> CodegenUnit<'tcx> {
CodegenUnit {
name: name,
items: FxHashMap(),
size_estimate: None,
}
}
pub fn name(&self) -> &InternedString {
&self.name
}
pub fn set_name(&mut self, name: InternedString) {
self.name = name;
}
pub fn items(&self) -> &FxHashMap<MonoItem<'tcx>, (Linkage, Visibility)> {
&self.items
}
pub fn items_mut(&mut self)
-> &mut FxHashMap<MonoItem<'tcx>, (Linkage, Visibility)>
{
&mut self.items
}
pub fn mangle_name(human_readable_name: &str) -> String {
// We generate a 80 bit hash from the name. This should be enough to
// avoid collisions and is still reasonably short for filenames.
let mut hasher = StableHasher::new();
human_readable_name.hash(&mut hasher);
let hash: u128 = hasher.finish();
let hash = hash & ((1u128 << 80) - 1);
base_n::encode(hash, base_n::CASE_INSENSITIVE)
}
pub fn estimate_size<'a>(&mut self, tcx: &TyCtxt<'a, 'tcx, 'tcx>) {
// Estimate the size of a codegen unit as (approximately) the number of MIR
// statements it corresponds to.
self.size_estimate = Some(self.items.keys().map(|mi| mi.size_estimate(tcx)).sum());
}
pub fn size_estimate(&self) -> usize {
// Should only be called if `estimate_size` has previously been called.
self.size_estimate.expect("estimate_size must be called before getting a size_estimate")
}
pub fn modify_size_estimate(&mut self, delta: usize) {
assert!(self.size_estimate.is_some());
if let Some(size_estimate) = self.size_estimate {
self.size_estimate = Some(size_estimate + delta);
}
}
}
impl<'tcx> HashStable<StableHashingContext<'tcx>> for CodegenUnit<'tcx> {
fn hash_stable<W: StableHasherResult>(&self,
hcx: &mut StableHashingContext<'tcx>,
hasher: &mut StableHasher<W>) {
let CodegenUnit {
ref items,
name,
// The size estimate is not relevant to the hash
size_estimate: _,
} = *self;
name.hash_stable(hcx, hasher);
let mut items: Vec<(Fingerprint, _)> = items.iter().map(|(trans_item, &attrs)| {
let mut hasher = StableHasher::new();
trans_item.hash_stable(hcx, &mut hasher);
let trans_item_fingerprint = hasher.finish();
(trans_item_fingerprint, attrs)
}).collect();
items.sort_unstable_by_key(|i| i.0);
items.hash_stable(hcx, hasher);
}
}
#[derive(Clone, Default)]
pub struct Stats {
pub n_glues_created: usize,
pub n_null_glues: usize,
pub n_real_glues: usize,
pub n_fns: usize,
pub n_inlines: usize,
pub n_closures: usize,
pub n_llvm_insns: usize,
pub llvm_insns: FxHashMap<String, usize>,
// (ident, llvm-instructions)
pub fn_stats: Vec<(String, usize)>,
}
impl_stable_hash_for!(struct self::Stats {
n_glues_created,
n_null_glues,
n_real_glues,
n_fns,
n_inlines,
n_closures,
n_llvm_insns,
llvm_insns,
fn_stats
});
impl Stats {
pub fn extend(&mut self, stats: Stats) {
self.n_glues_created += stats.n_glues_created;
self.n_null_glues += stats.n_null_glues;
self.n_real_glues += stats.n_real_glues;
self.n_fns += stats.n_fns;
self.n_inlines += stats.n_inlines;
self.n_closures += stats.n_closures;
self.n_llvm_insns += stats.n_llvm_insns;
for (k, v) in stats.llvm_insns {
*self.llvm_insns.entry(k).or_insert(0) += v;
}
self.fn_stats.extend(stats.fn_stats);
}
}