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use dep_graph::DepNode;
use hir;
use hir::map::DefPathData;
use mir::{Mir, Promoted};
use ty::TyCtxt;
use syntax::ast::NodeId;
use util::common::time;
use std::borrow::Cow;
use std::fmt;
#[derive(Debug, Copy, Clone)]
pub enum MirSource {
Fn(NodeId),
Const(NodeId),
Static(NodeId, hir::Mutability),
Promoted(NodeId, Promoted)
}
impl<'a, 'tcx> MirSource {
pub fn from_node(tcx: TyCtxt<'a, 'tcx, 'tcx>, id: NodeId) -> MirSource {
use hir::*;
let def_id = tcx.hir.local_def_id(id);
let def_key = tcx.def_key(def_id);
if def_key.disambiguated_data.data == DefPathData::Initializer {
return MirSource::Const(id);
}
match tcx.hir.get(id) {
map::NodeItem(&Item { node: ItemConst(..), .. }) |
map::NodeTraitItem(&TraitItem { node: TraitItemKind::Const(..), .. }) |
map::NodeImplItem(&ImplItem { node: ImplItemKind::Const(..), .. }) => {
MirSource::Const(id)
}
map::NodeItem(&Item { node: ItemStatic(_, m, _), .. }) => {
MirSource::Static(id, m)
}
_ => MirSource::Fn(id)
}
}
pub fn item_id(&self) -> NodeId {
match *self {
MirSource::Fn(id) |
MirSource::Const(id) |
MirSource::Static(id, _) |
MirSource::Promoted(id, _) => id
}
}
}
pub trait Pass {
fn name<'a>(&self) -> Cow<'static, str> {
let name = unsafe { ::std::intrinsics::type_name::<Self>() };
if let Some(tail) = name.rfind(":") {
Cow::from(&name[tail+1..])
} else {
Cow::from(name)
}
}
fn disambiguator<'a>(&'a self) -> Option<Box<fmt::Display+'a>> { None }
}
pub trait MirMapPass<'tcx>: Pass {
fn run_pass<'a>(
&mut self,
tcx: TyCtxt<'a, 'tcx, 'tcx>,
hooks: &mut [Box<for<'s> MirPassHook<'s>>]);
}
pub trait MirPassHook<'tcx>: Pass {
fn on_mir_pass<'a>(
&mut self,
tcx: TyCtxt<'a, 'tcx, 'tcx>,
src: MirSource,
mir: &Mir<'tcx>,
pass: &Pass,
is_after: bool
);
}
pub trait MirPass<'tcx>: Pass {
fn run_pass<'a>(&mut self, tcx: TyCtxt<'a, 'tcx, 'tcx>,
src: MirSource, mir: &mut Mir<'tcx>);
}
impl<'tcx, T: MirPass<'tcx>> MirMapPass<'tcx> for T {
fn run_pass<'a>(&mut self,
tcx: TyCtxt<'a, 'tcx, 'tcx>,
hooks: &mut [Box<for<'s> MirPassHook<'s>>])
{
let def_ids = tcx.maps.mir.borrow().keys();
for def_id in def_ids {
if !def_id.is_local() {
continue;
}
let _task = tcx.dep_graph.in_task(DepNode::Mir(def_id));
let mir = &mut tcx.maps.mir.borrow()[&def_id].borrow_mut();
tcx.dep_graph.write(DepNode::Mir(def_id));
let id = tcx.hir.as_local_node_id(def_id).unwrap();
let src = MirSource::from_node(tcx, id);
for hook in &mut *hooks {
hook.on_mir_pass(tcx, src, mir, self, false);
}
MirPass::run_pass(self, tcx, src, mir);
for hook in &mut *hooks {
hook.on_mir_pass(tcx, src, mir, self, true);
}
for (i, mir) in mir.promoted.iter_enumerated_mut() {
let src = MirSource::Promoted(id, i);
for hook in &mut *hooks {
hook.on_mir_pass(tcx, src, mir, self, false);
}
MirPass::run_pass(self, tcx, src, mir);
for hook in &mut *hooks {
hook.on_mir_pass(tcx, src, mir, self, true);
}
}
}
}
}
pub struct Passes {
passes: Vec<Box<for<'tcx> MirMapPass<'tcx>>>,
pass_hooks: Vec<Box<for<'tcx> MirPassHook<'tcx>>>,
plugin_passes: Vec<Box<for<'tcx> MirMapPass<'tcx>>>
}
impl<'a, 'tcx> Passes {
pub fn new() -> Passes {
let passes = Passes {
passes: Vec::new(),
pass_hooks: Vec::new(),
plugin_passes: Vec::new()
};
passes
}
pub fn run_passes(&mut self, tcx: TyCtxt<'a, 'tcx, 'tcx>) {
let Passes { ref mut passes, ref mut plugin_passes, ref mut pass_hooks } = *self;
for pass in plugin_passes.iter_mut().chain(passes.iter_mut()) {
time(tcx.sess.time_passes(), &*pass.name(),
|| pass.run_pass(tcx, pass_hooks));
}
}
pub fn push_pass(&mut self, pass: Box<for<'b> MirMapPass<'b>>) {
self.passes.push(pass);
}
pub fn push_hook(&mut self, hook: Box<for<'b> MirPassHook<'b>>) {
self.pass_hooks.push(hook);
}
}
impl ::std::iter::Extend<Box<for<'a> MirMapPass<'a>>> for Passes {
fn extend<I: IntoIterator<Item=Box<for <'a> MirMapPass<'a>>>>(&mut self, it: I) {
self.plugin_passes.extend(it);
}
}