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// 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.
//! An experimental pass that scources for `#[rustc_mir]` attributes,
//! builds the resulting MIR, and dumps it out into a file for inspection.
//!
//! The attribute formats that are currently accepted are:
//!
//! - `#[rustc_mir(graphviz="file.gv")]`
//! - `#[rustc_mir(pretty="file.mir")]`
use build;
use rustc::dep_graph::DepNode;
use rustc::mir::Mir;
use rustc::mir::transform::MirSource;
use rustc::mir::visit::MutVisitor;
use pretty;
use hair::cx::Cx;
use rustc::infer::InferCtxt;
use rustc::traits::Reveal;
use rustc::ty::{self, Ty, TyCtxt};
use rustc::ty::subst::Substs;
use rustc::hir;
use rustc::hir::intravisit::{Visitor, NestedVisitorMap};
use syntax::abi::Abi;
use syntax::ast;
use syntax_pos::Span;
use std::mem;
pub fn build_mir_for_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
tcx.visit_all_item_likes_in_krate(DepNode::Mir, &mut BuildMir {
tcx: tcx
}.as_deep_visitor());
}
/// A pass to lift all the types and substitutions in a Mir
/// to the global tcx. Sadly, we don't have a "folder" that
/// can change 'tcx so we have to transmute afterwards.
struct GlobalizeMir<'a, 'gcx: 'a> {
tcx: TyCtxt<'a, 'gcx, 'gcx>,
span: Span
}
impl<'a, 'gcx: 'tcx, 'tcx> MutVisitor<'tcx> for GlobalizeMir<'a, 'gcx> {
fn visit_ty(&mut self, ty: &mut Ty<'tcx>) {
if let Some(lifted) = self.tcx.lift(ty) {
*ty = lifted;
} else {
span_bug!(self.span,
"found type `{:?}` with inference types/regions in MIR",
ty);
}
}
fn visit_substs(&mut self, substs: &mut &'tcx Substs<'tcx>) {
if let Some(lifted) = self.tcx.lift(substs) {
*substs = lifted;
} else {
span_bug!(self.span,
"found substs `{:?}` with inference types/regions in MIR",
substs);
}
}
}
///////////////////////////////////////////////////////////////////////////
// BuildMir -- walks a crate, looking for fn items and methods to build MIR from
struct BuildMir<'a, 'tcx: 'a> {
tcx: TyCtxt<'a, 'tcx, 'tcx>
}
fn build<'a, 'gcx, 'tcx>(infcx: &InferCtxt<'a, 'gcx, 'tcx>,
body_id: hir::BodyId)
-> (Mir<'tcx>, MirSource) {
let tcx = infcx.tcx.global_tcx();
let item_id = tcx.hir.body_owner(body_id);
let src = MirSource::from_node(tcx, item_id);
let cx = Cx::new(infcx, src);
if let MirSource::Fn(id) = src {
// fetch the fully liberated fn signature (that is, all bound
// types/lifetimes replaced)
let fn_sig = cx.tables().liberated_fn_sigs[&id].clone();
let ty = tcx.item_type(tcx.hir.local_def_id(id));
let (abi, implicit_argument) = if let ty::TyClosure(..) = ty.sty {
(Abi::Rust, Some((closure_self_ty(tcx, id, body_id), None)))
} else {
(ty.fn_abi(), None)
};
let body = tcx.hir.body(body_id);
let explicit_arguments =
body.arguments
.iter()
.enumerate()
.map(|(index, arg)| {
(fn_sig.inputs()[index], Some(&*arg.pat))
});
let arguments = implicit_argument.into_iter().chain(explicit_arguments);
(build::construct_fn(cx, id, arguments, abi, fn_sig.output(), body), src)
} else {
(build::construct_const(cx, body_id), src)
}
}
impl<'a, 'tcx> Visitor<'tcx> for BuildMir<'a, 'tcx> {
fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx> {
NestedVisitorMap::None
}
fn visit_nested_body(&mut self, body_id: hir::BodyId) {
self.tcx.infer_ctxt(body_id, Reveal::NotSpecializable).enter(|infcx| {
let (mut mir, src) = build(&infcx, body_id);
// Convert the Mir to global types.
let tcx = infcx.tcx.global_tcx();
let mut globalizer = GlobalizeMir {
tcx: tcx,
span: mir.span
};
globalizer.visit_mir(&mut mir);
let mir = unsafe {
mem::transmute::<Mir, Mir<'tcx>>(mir)
};
pretty::dump_mir(tcx, "mir_map", &0, src, &mir);
let mir = tcx.alloc_mir(mir);
let def_id = tcx.hir.local_def_id(src.item_id());
assert!(tcx.mir_map.borrow_mut().insert(def_id, mir).is_none());
});
let body = self.tcx.hir.body(body_id);
self.visit_body(body);
}
}
fn closure_self_ty<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
closure_expr_id: ast::NodeId,
body_id: hir::BodyId)
-> Ty<'tcx> {
let closure_ty = tcx.body_tables(body_id).node_id_to_type(closure_expr_id);
// We're just hard-coding the idea that the signature will be
// &self or &mut self and hence will have a bound region with
// number 0, hokey.
let region = ty::Region::ReFree(ty::FreeRegion {
scope: tcx.region_maps.item_extent(body_id.node_id),
bound_region: ty::BoundRegion::BrAnon(0),
});
let region = tcx.mk_region(region);
match tcx.closure_kind(tcx.hir.local_def_id(closure_expr_id)) {
ty::ClosureKind::Fn =>
tcx.mk_ref(region,
ty::TypeAndMut { ty: closure_ty,
mutbl: hir::MutImmutable }),
ty::ClosureKind::FnMut =>
tcx.mk_ref(region,
ty::TypeAndMut { ty: closure_ty,
mutbl: hir::MutMutable }),
ty::ClosureKind::FnOnce =>
closure_ty
}
}
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