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#![crate_name = "rustc_typeck"]
#![unstable(feature = "rustc_private", issue = "27812")]
#![crate_type = "dylib"]
#![crate_type = "rlib"]
#![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
html_root_url = "https://doc.rust-lang.org/nightly/")]
#![deny(warnings)]
#![allow(non_camel_case_types)]
#![feature(box_patterns)]
#![feature(box_syntax)]
#![feature(conservative_impl_trait)]
#![cfg_attr(stage0,feature(field_init_shorthand))]
#![feature(loop_break_value)]
#![feature(quote)]
#![feature(rustc_diagnostic_macros)]
#![feature(rustc_private)]
#![feature(staged_api)]
#[macro_use] extern crate log;
#[macro_use] extern crate syntax;
extern crate syntax_pos;
extern crate arena;
extern crate fmt_macros;
#[macro_use] extern crate rustc;
extern crate rustc_platform_intrinsics as intrinsics;
extern crate rustc_back;
extern crate rustc_const_math;
extern crate rustc_const_eval;
extern crate rustc_data_structures;
extern crate rustc_errors as errors;
pub use rustc::dep_graph;
pub use rustc::hir;
pub use rustc::lint;
pub use rustc::middle;
pub use rustc::session;
pub use rustc::util;
use dep_graph::DepNode;
use hir::map as hir_map;
use rustc::infer::InferOk;
use rustc::ty::subst::Substs;
use rustc::ty::{self, Ty, TyCtxt};
use rustc::ty::maps::Providers;
use rustc::traits::{ObligationCause, ObligationCauseCode, Reveal};
use session::config;
use util::common::time;
use syntax::ast;
use syntax::abi::Abi;
use syntax_pos::Span;
use std::iter;
pub mod diagnostics;
pub mod check;
pub mod check_unused;
mod astconv;
pub mod collect;
mod constrained_type_params;
mod impl_wf_check;
pub mod coherence;
pub mod variance;
pub struct TypeAndSubsts<'tcx> {
pub substs: &'tcx Substs<'tcx>,
pub ty: Ty<'tcx>,
}
fn require_c_abi_if_variadic(tcx: TyCtxt,
decl: &hir::FnDecl,
abi: Abi,
span: Span) {
if decl.variadic && abi != Abi::C {
let mut err = struct_span_err!(tcx.sess, span, E0045,
"variadic function must have C calling convention");
err.span_label(span, &("variadics require C calling conventions").to_string())
.emit();
}
}
fn require_same_types<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
cause: &ObligationCause<'tcx>,
expected: Ty<'tcx>,
actual: Ty<'tcx>)
-> bool {
tcx.infer_ctxt((), Reveal::UserFacing).enter(|infcx| {
match infcx.eq_types(false, &cause, expected, actual) {
Ok(InferOk { obligations, .. }) => {
assert!(obligations.is_empty());
true
}
Err(err) => {
infcx.report_mismatched_types(cause, expected, actual, err).emit();
false
}
}
})
}
fn check_main_fn_ty<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
main_id: ast::NodeId,
main_span: Span) {
let main_def_id = tcx.hir.local_def_id(main_id);
let main_t = tcx.item_type(main_def_id);
match main_t.sty {
ty::TyFnDef(..) => {
match tcx.hir.find(main_id) {
Some(hir_map::NodeItem(it)) => {
match it.node {
hir::ItemFn(.., ref generics, _) => {
if generics.is_parameterized() {
struct_span_err!(tcx.sess, generics.span, E0131,
"main function is not allowed to have type parameters")
.span_label(generics.span,
&format!("main cannot have type parameters"))
.emit();
return;
}
}
_ => ()
}
}
_ => ()
}
let substs = tcx.intern_substs(&[]);
let se_ty = tcx.mk_fn_def(main_def_id, substs,
ty::Binder(tcx.mk_fn_sig(
iter::empty(),
tcx.mk_nil(),
false,
hir::Unsafety::Normal,
Abi::Rust
))
);
require_same_types(
tcx,
&ObligationCause::new(main_span, main_id, ObligationCauseCode::MainFunctionType),
se_ty,
main_t);
}
_ => {
span_bug!(main_span,
"main has a non-function type: found `{}`",
main_t);
}
}
}
fn check_start_fn_ty<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
start_id: ast::NodeId,
start_span: Span) {
let start_def_id = tcx.hir.local_def_id(start_id);
let start_t = tcx.item_type(start_def_id);
match start_t.sty {
ty::TyFnDef(..) => {
match tcx.hir.find(start_id) {
Some(hir_map::NodeItem(it)) => {
match it.node {
hir::ItemFn(..,ref ps,_)
if ps.is_parameterized() => {
struct_span_err!(tcx.sess, ps.span, E0132,
"start function is not allowed to have type parameters")
.span_label(ps.span,
&format!("start function cannot have type parameters"))
.emit();
return;
}
_ => ()
}
}
_ => ()
}
let substs = tcx.intern_substs(&[]);
let se_ty = tcx.mk_fn_def(start_def_id, substs,
ty::Binder(tcx.mk_fn_sig(
[
tcx.types.isize,
tcx.mk_imm_ptr(tcx.mk_imm_ptr(tcx.types.u8))
].iter().cloned(),
tcx.types.isize,
false,
hir::Unsafety::Normal,
Abi::Rust
))
);
require_same_types(
tcx,
&ObligationCause::new(start_span, start_id, ObligationCauseCode::StartFunctionType),
se_ty,
start_t);
}
_ => {
span_bug!(start_span,
"start has a non-function type: found `{}`",
start_t);
}
}
}
fn check_for_entry_fn<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
let _task = tcx.dep_graph.in_task(DepNode::CheckEntryFn);
if let Some((id, sp)) = *tcx.sess.entry_fn.borrow() {
match tcx.sess.entry_type.get() {
Some(config::EntryMain) => check_main_fn_ty(tcx, id, sp),
Some(config::EntryStart) => check_start_fn_ty(tcx, id, sp),
Some(config::EntryNone) => {}
None => bug!("entry function without a type")
}
}
}
pub fn provide(providers: &mut Providers) {
collect::provide(providers);
coherence::provide(providers);
check::provide(providers);
}
pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>)
-> Result<(), usize> {
let time_passes = tcx.sess.time_passes();
tcx.sess.track_errors(|| {
time(time_passes, "type collecting", ||
collect::collect_item_types(tcx));
})?;
time(time_passes, "variance inference", ||
variance::infer_variance(tcx));
tcx.sess.track_errors(|| {
time(time_passes, "impl wf inference", ||
impl_wf_check::impl_wf_check(tcx));
})?;
tcx.sess.track_errors(|| {
time(time_passes, "coherence checking", ||
coherence::check_coherence(tcx));
})?;
time(time_passes, "wf checking", || check::check_wf_new(tcx))?;
time(time_passes, "item-types checking", || check::check_item_types(tcx))?;
time(time_passes, "item-bodies checking", || check::check_item_bodies(tcx))?;
check_unused::check_crate(tcx);
check_for_entry_fn(tcx);
let err_count = tcx.sess.err_count();
if err_count == 0 {
Ok(())
} else {
Err(err_count)
}
}
__build_diagnostic_array! { librustc_typeck, DIAGNOSTICS }