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use hir::def_id::DefId;
use middle::region;
use ty::subst::Substs;
use ty::{self, AdtDef, TypeFlags, Ty, TyCtxt, TypeFoldable};
use ty::{Slice, TyS};
use ty::subst::Kind;
use std::fmt;
use std::iter;
use std::cmp::Ordering;
use syntax::abi;
use syntax::ast::{self, Name};
use syntax::symbol::{keywords, InternedString};
use util::nodemap::FxHashMap;
use serialize;
use hir;
use self::InferTy::*;
use self::TypeVariants::*;
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, RustcEncodable, RustcDecodable)]
pub struct TypeAndMut<'tcx> {
pub ty: Ty<'tcx>,
pub mutbl: hir::Mutability,
}
#[derive(Clone, PartialEq, PartialOrd, Eq, Ord, Hash,
RustcEncodable, RustcDecodable, Copy)]
pub struct FreeRegion {
pub scope: region::CodeExtent,
pub bound_region: BoundRegion
}
#[derive(Clone, PartialEq, PartialOrd, Eq, Ord, Hash,
RustcEncodable, RustcDecodable, Copy)]
pub enum BoundRegion {
BrAnon(u32),
BrNamed(DefId, Name),
BrFresh(u32),
BrEnv
}
#[derive(Copy, Clone, Debug, PartialEq, PartialOrd, Eq, Ord, Hash,
RustcEncodable, RustcDecodable)]
pub struct Issue32330 {
pub fn_def_id: DefId,
pub region_name: ast::Name,
}
#[derive(Clone, PartialEq, Eq, Hash, Debug, RustcEncodable, RustcDecodable)]
pub enum TypeVariants<'tcx> {
TyBool,
TyChar,
TyInt(ast::IntTy),
TyUint(ast::UintTy),
TyFloat(ast::FloatTy),
TyAdt(&'tcx AdtDef, &'tcx Substs<'tcx>),
TyStr,
TyArray(Ty<'tcx>, usize),
TySlice(Ty<'tcx>),
TyRawPtr(TypeAndMut<'tcx>),
TyRef(&'tcx Region, TypeAndMut<'tcx>),
TyFnDef(DefId, &'tcx Substs<'tcx>, PolyFnSig<'tcx>),
TyFnPtr(PolyFnSig<'tcx>),
TyDynamic(Binder<&'tcx Slice<ExistentialPredicate<'tcx>>>, &'tcx ty::Region),
TyClosure(DefId, ClosureSubsts<'tcx>),
TyNever,
TyTuple(&'tcx Slice<Ty<'tcx>>, bool),
TyProjection(ProjectionTy<'tcx>),
TyAnon(DefId, &'tcx Substs<'tcx>),
TyParam(ParamTy),
TyInfer(InferTy),
TyError,
}
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, RustcEncodable, RustcDecodable)]
pub struct ClosureSubsts<'tcx> {
pub substs: &'tcx Substs<'tcx>,
}
impl<'a, 'gcx, 'acx, 'tcx> ClosureSubsts<'tcx> {
#[inline]
pub fn upvar_tys(self, def_id: DefId, tcx: TyCtxt<'a, 'gcx, 'acx>) ->
impl Iterator<Item=Ty<'tcx>> + 'tcx
{
let generics = tcx.item_generics(def_id);
self.substs[self.substs.len()-generics.own_count()..].iter().map(
|t| t.as_type().expect("unexpected region in upvars"))
}
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
pub enum ExistentialPredicate<'tcx> {
Trait(ExistentialTraitRef<'tcx>),
Projection(ExistentialProjection<'tcx>),
AutoTrait(DefId),
}
impl<'a, 'gcx, 'tcx> ExistentialPredicate<'tcx> {
pub fn cmp(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>, other: &Self) -> Ordering {
use self::ExistentialPredicate::*;
match (*self, *other) {
(Trait(_), Trait(_)) => Ordering::Equal,
(Projection(ref a), Projection(ref b)) => a.sort_key(tcx).cmp(&b.sort_key(tcx)),
(AutoTrait(ref a), AutoTrait(ref b)) =>
tcx.lookup_trait_def(*a).def_path_hash.cmp(&tcx.lookup_trait_def(*b).def_path_hash),
(Trait(_), _) => Ordering::Less,
(Projection(_), Trait(_)) => Ordering::Greater,
(Projection(_), _) => Ordering::Less,
(AutoTrait(_), _) => Ordering::Greater,
}
}
}
impl<'a, 'gcx, 'tcx> Binder<ExistentialPredicate<'tcx>> {
pub fn with_self_ty(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>, self_ty: Ty<'tcx>)
-> ty::Predicate<'tcx> {
use ty::ToPredicate;
match *self.skip_binder() {
ExistentialPredicate::Trait(tr) => Binder(tr).with_self_ty(tcx, self_ty).to_predicate(),
ExistentialPredicate::Projection(p) =>
ty::Predicate::Projection(Binder(p.with_self_ty(tcx, self_ty))),
ExistentialPredicate::AutoTrait(did) => {
let trait_ref = Binder(ty::TraitRef {
def_id: did,
substs: tcx.mk_substs_trait(self_ty, &[]),
});
trait_ref.to_predicate()
}
}
}
}
impl<'tcx> serialize::UseSpecializedDecodable for &'tcx Slice<ExistentialPredicate<'tcx>> {}
impl<'tcx> Slice<ExistentialPredicate<'tcx>> {
pub fn principal(&self) -> Option<ExistentialTraitRef<'tcx>> {
match self.get(0) {
Some(&ExistentialPredicate::Trait(tr)) => Some(tr),
_ => None
}
}
#[inline]
pub fn projection_bounds<'a>(&'a self) ->
impl Iterator<Item=ExistentialProjection<'tcx>> + 'a {
self.iter().filter_map(|predicate| {
match *predicate {
ExistentialPredicate::Projection(p) => Some(p),
_ => None,
}
})
}
#[inline]
pub fn auto_traits<'a>(&'a self) -> impl Iterator<Item=DefId> + 'a {
self.iter().filter_map(|predicate| {
match *predicate {
ExistentialPredicate::AutoTrait(d) => Some(d),
_ => None
}
})
}
}
impl<'tcx> Binder<&'tcx Slice<ExistentialPredicate<'tcx>>> {
pub fn principal(&self) -> Option<PolyExistentialTraitRef<'tcx>> {
self.skip_binder().principal().map(Binder)
}
#[inline]
pub fn projection_bounds<'a>(&'a self) ->
impl Iterator<Item=PolyExistentialProjection<'tcx>> + 'a {
self.skip_binder().projection_bounds().map(Binder)
}
#[inline]
pub fn auto_traits<'a>(&'a self) -> impl Iterator<Item=DefId> + 'a {
self.skip_binder().auto_traits()
}
pub fn iter<'a>(&'a self)
-> impl DoubleEndedIterator<Item=Binder<ExistentialPredicate<'tcx>>> + 'tcx {
self.skip_binder().iter().cloned().map(Binder)
}
}
#[derive(Copy, Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
pub struct TraitRef<'tcx> {
pub def_id: DefId,
pub substs: &'tcx Substs<'tcx>,
}
impl<'tcx> TraitRef<'tcx> {
pub fn new(def_id: DefId, substs: &'tcx Substs<'tcx>) -> TraitRef<'tcx> {
TraitRef { def_id: def_id, substs: substs }
}
pub fn self_ty(&self) -> Ty<'tcx> {
self.substs.type_at(0)
}
pub fn input_types<'a>(&'a self) -> impl DoubleEndedIterator<Item=Ty<'tcx>> + 'a {
self.substs.types()
}
}
pub type PolyTraitRef<'tcx> = Binder<TraitRef<'tcx>>;
impl<'tcx> PolyTraitRef<'tcx> {
pub fn self_ty(&self) -> Ty<'tcx> {
self.0.self_ty()
}
pub fn def_id(&self) -> DefId {
self.0.def_id
}
pub fn substs(&self) -> &'tcx Substs<'tcx> {
self.0.substs
}
pub fn input_types<'a>(&'a self) -> impl DoubleEndedIterator<Item=Ty<'tcx>> + 'a {
self.0.input_types()
}
pub fn to_poly_trait_predicate(&self) -> ty::PolyTraitPredicate<'tcx> {
Binder(ty::TraitPredicate { trait_ref: self.0.clone() })
}
}
#[derive(Copy, Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
pub struct ExistentialTraitRef<'tcx> {
pub def_id: DefId,
pub substs: &'tcx Substs<'tcx>,
}
impl<'a, 'gcx, 'tcx> ExistentialTraitRef<'tcx> {
pub fn input_types<'b>(&'b self) -> impl DoubleEndedIterator<Item=Ty<'tcx>> + 'b {
self.substs.types()
}
pub fn with_self_ty(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>, self_ty: Ty<'tcx>)
-> ty::TraitRef<'tcx> {
assert!(!self_ty.has_escaping_regions());
ty::TraitRef {
def_id: self.def_id,
substs: tcx.mk_substs(
iter::once(Kind::from(self_ty)).chain(self.substs.iter().cloned()))
}
}
}
pub type PolyExistentialTraitRef<'tcx> = Binder<ExistentialTraitRef<'tcx>>;
impl<'tcx> PolyExistentialTraitRef<'tcx> {
pub fn def_id(&self) -> DefId {
self.0.def_id
}
pub fn input_types<'a>(&'a self) -> impl DoubleEndedIterator<Item=Ty<'tcx>> + 'a {
self.0.input_types()
}
}
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, RustcEncodable, RustcDecodable)]
pub struct Binder<T>(pub T);
impl<T> Binder<T> {
pub fn skip_binder(&self) -> &T {
&self.0
}
pub fn as_ref(&self) -> Binder<&T> {
ty::Binder(&self.0)
}
pub fn map_bound_ref<F,U>(&self, f: F) -> Binder<U>
where F: FnOnce(&T) -> U
{
self.as_ref().map_bound(f)
}
pub fn map_bound<F,U>(self, f: F) -> Binder<U>
where F: FnOnce(T) -> U
{
ty::Binder(f(self.0))
}
}
impl fmt::Debug for TypeFlags {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:x}", self.bits)
}
}
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, RustcEncodable, RustcDecodable)]
pub struct ProjectionTy<'tcx> {
pub trait_ref: ty::TraitRef<'tcx>,
pub item_name: Name,
}
#[derive(Copy, Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
pub struct FnSig<'tcx> {
pub inputs_and_output: &'tcx Slice<Ty<'tcx>>,
pub variadic: bool,
pub unsafety: hir::Unsafety,
pub abi: abi::Abi,
}
impl<'tcx> FnSig<'tcx> {
pub fn inputs(&self) -> &'tcx [Ty<'tcx>] {
&self.inputs_and_output[..self.inputs_and_output.len() - 1]
}
pub fn output(&self) -> Ty<'tcx> {
self.inputs_and_output[self.inputs_and_output.len() - 1]
}
}
pub type PolyFnSig<'tcx> = Binder<FnSig<'tcx>>;
impl<'tcx> PolyFnSig<'tcx> {
pub fn inputs(&self) -> Binder<&'tcx [Ty<'tcx>]> {
Binder(self.skip_binder().inputs())
}
pub fn input(&self, index: usize) -> ty::Binder<Ty<'tcx>> {
self.map_bound_ref(|fn_sig| fn_sig.inputs()[index])
}
pub fn output(&self) -> ty::Binder<Ty<'tcx>> {
self.map_bound_ref(|fn_sig| fn_sig.output().clone())
}
pub fn variadic(&self) -> bool {
self.skip_binder().variadic
}
pub fn unsafety(&self) -> hir::Unsafety {
self.skip_binder().unsafety
}
pub fn abi(&self) -> abi::Abi {
self.skip_binder().abi
}
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
pub struct ParamTy {
pub idx: u32,
pub name: Name,
}
impl<'a, 'gcx, 'tcx> ParamTy {
pub fn new(index: u32, name: Name) -> ParamTy {
ParamTy { idx: index, name: name }
}
pub fn for_self() -> ParamTy {
ParamTy::new(0, keywords::SelfType.name())
}
pub fn for_def(def: &ty::TypeParameterDef) -> ParamTy {
ParamTy::new(def.index, def.name)
}
pub fn to_ty(self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Ty<'tcx> {
tcx.mk_param(self.idx, self.name)
}
pub fn is_self(&self) -> bool {
if self.name == keywords::SelfType.name() {
assert_eq!(self.idx, 0);
true
} else {
false
}
}
}
#[derive(Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Debug, Copy)]
pub struct DebruijnIndex {
pub depth: u32,
}
#[derive(Clone, PartialEq, Eq, Hash, Copy, RustcEncodable, RustcDecodable)]
pub enum Region {
ReEarlyBound(EarlyBoundRegion),
ReLateBound(DebruijnIndex, BoundRegion),
ReFree(FreeRegion),
ReScope(region::CodeExtent),
ReStatic,
ReVar(RegionVid),
ReSkolemized(SkolemizedRegionVid, BoundRegion),
ReEmpty,
ReErased,
}
impl<'tcx> serialize::UseSpecializedDecodable for &'tcx Region {}
#[derive(Copy, Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Debug)]
pub struct EarlyBoundRegion {
pub index: u32,
pub name: Name,
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
pub struct TyVid {
pub index: u32,
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
pub struct IntVid {
pub index: u32
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
pub struct FloatVid {
pub index: u32
}
#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
pub struct RegionVid {
pub index: u32
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
pub struct SkolemizedRegionVid {
pub index: u32
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
pub enum InferTy {
TyVar(TyVid),
IntVar(IntVid),
FloatVar(FloatVid),
FreshTy(u32),
FreshIntTy(u32),
FreshFloatTy(u32)
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, RustcEncodable, RustcDecodable)]
pub struct ExistentialProjection<'tcx> {
pub trait_ref: ExistentialTraitRef<'tcx>,
pub item_name: Name,
pub ty: Ty<'tcx>
}
pub type PolyExistentialProjection<'tcx> = Binder<ExistentialProjection<'tcx>>;
impl<'a, 'tcx, 'gcx> ExistentialProjection<'tcx> {
pub fn item_name(&self) -> Name {
self.item_name
}
pub fn sort_key(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> (u64, InternedString) {
let trait_def = tcx.lookup_trait_def(self.trait_ref.def_id);
let def_path_hash = trait_def.def_path_hash;
let item_name = self.item_name.as_str();
(def_path_hash, item_name)
}
pub fn with_self_ty(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>,
self_ty: Ty<'tcx>)
-> ty::ProjectionPredicate<'tcx>
{
assert!(!self_ty.has_escaping_regions());
ty::ProjectionPredicate {
projection_ty: ty::ProjectionTy {
trait_ref: self.trait_ref.with_self_ty(tcx, self_ty),
item_name: self.item_name
},
ty: self.ty
}
}
}
impl<'a, 'tcx, 'gcx> PolyExistentialProjection<'tcx> {
pub fn item_name(&self) -> Name {
self.skip_binder().item_name()
}
pub fn sort_key(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> (u64, InternedString) {
self.skip_binder().sort_key(tcx)
}
pub fn with_self_ty(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>, self_ty: Ty<'tcx>)
-> ty::PolyProjectionPredicate<'tcx> {
self.map_bound(|p| p.with_self_ty(tcx, self_ty))
}
}
impl DebruijnIndex {
pub fn new(depth: u32) -> DebruijnIndex {
assert!(depth > 0);
DebruijnIndex { depth: depth }
}
pub fn shifted(&self, amount: u32) -> DebruijnIndex {
DebruijnIndex { depth: self.depth + amount }
}
}
impl Region {
pub fn is_bound(&self) -> bool {
match *self {
ty::ReEarlyBound(..) => true,
ty::ReLateBound(..) => true,
_ => false
}
}
pub fn needs_infer(&self) -> bool {
match *self {
ty::ReVar(..) | ty::ReSkolemized(..) => true,
_ => false
}
}
pub fn escapes_depth(&self, depth: u32) -> bool {
match *self {
ty::ReLateBound(debruijn, _) => debruijn.depth > depth,
_ => false,
}
}
pub fn from_depth(&self, depth: u32) -> Region {
match *self {
ty::ReLateBound(debruijn, r) => ty::ReLateBound(DebruijnIndex {
depth: debruijn.depth - (depth - 1)
}, r),
r => r
}
}
pub fn type_flags(&self) -> TypeFlags {
let mut flags = TypeFlags::empty();
match *self {
ty::ReVar(..) => {
flags = flags | TypeFlags::HAS_RE_INFER;
flags = flags | TypeFlags::KEEP_IN_LOCAL_TCX;
}
ty::ReSkolemized(..) => {
flags = flags | TypeFlags::HAS_RE_INFER;
flags = flags | TypeFlags::HAS_RE_SKOL;
flags = flags | TypeFlags::KEEP_IN_LOCAL_TCX;
}
ty::ReLateBound(..) => { }
ty::ReEarlyBound(..) => { flags = flags | TypeFlags::HAS_RE_EARLY_BOUND; }
ty::ReStatic | ty::ReErased => { }
_ => { flags = flags | TypeFlags::HAS_FREE_REGIONS; }
}
match *self {
ty::ReStatic | ty::ReEmpty | ty::ReErased => (),
_ => flags = flags | TypeFlags::HAS_LOCAL_NAMES,
}
debug!("type_flags({:?}) = {:?}", self, flags);
flags
}
}
impl<'a, 'gcx, 'tcx> TyS<'tcx> {
pub fn as_opt_param_ty(&self) -> Option<ty::ParamTy> {
match self.sty {
ty::TyParam(ref d) => Some(d.clone()),
_ => None,
}
}
pub fn is_nil(&self) -> bool {
match self.sty {
TyTuple(ref tys, _) => tys.is_empty(),
_ => false
}
}
pub fn is_never(&self) -> bool {
match self.sty {
TyNever => true,
_ => false,
}
}
pub fn is_defaulted_unit(&self) -> bool {
match self.sty {
TyTuple(_, true) => true,
_ => false,
}
}
pub fn is_uninhabited_from(&self, module: DefId, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> bool {
let mut visited = FxHashMap::default();
let forest = self.uninhabited_from(&mut visited, tcx);
forest.contains(tcx, module)
}
pub fn is_primitive(&self) -> bool {
match self.sty {
TyBool | TyChar | TyInt(_) | TyUint(_) | TyFloat(_) => true,
_ => false,
}
}
pub fn is_ty_var(&self) -> bool {
match self.sty {
TyInfer(TyVar(_)) => true,
_ => false
}
}
pub fn is_phantom_data(&self) -> bool {
if let TyAdt(def, _) = self.sty {
def.is_phantom_data()
} else {
false
}
}
pub fn is_bool(&self) -> bool { self.sty == TyBool }
pub fn is_param(&self, index: u32) -> bool {
match self.sty {
ty::TyParam(ref data) => data.idx == index,
_ => false,
}
}
pub fn is_self(&self) -> bool {
match self.sty {
TyParam(ref p) => p.is_self(),
_ => false
}
}
pub fn is_slice(&self) -> bool {
match self.sty {
TyRawPtr(mt) | TyRef(_, mt) => match mt.ty.sty {
TySlice(_) | TyStr => true,
_ => false,
},
_ => false
}
}
pub fn is_structural(&self) -> bool {
match self.sty {
TyAdt(..) | TyTuple(..) | TyArray(..) | TyClosure(..) => true,
_ => self.is_slice() | self.is_trait()
}
}
#[inline]
pub fn is_simd(&self) -> bool {
match self.sty {
TyAdt(def, _) => def.repr.simd,
_ => false
}
}
pub fn sequence_element_type(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Ty<'tcx> {
match self.sty {
TyArray(ty, _) | TySlice(ty) => ty,
TyStr => tcx.mk_mach_uint(ast::UintTy::U8),
_ => bug!("sequence_element_type called on non-sequence value: {}", self),
}
}
pub fn simd_type(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Ty<'tcx> {
match self.sty {
TyAdt(def, substs) => {
def.struct_variant().fields[0].ty(tcx, substs)
}
_ => bug!("simd_type called on invalid type")
}
}
pub fn simd_size(&self, _cx: TyCtxt) -> usize {
match self.sty {
TyAdt(def, _) => def.struct_variant().fields.len(),
_ => bug!("simd_size called on invalid type")
}
}
pub fn is_region_ptr(&self) -> bool {
match self.sty {
TyRef(..) => true,
_ => false
}
}
pub fn is_mutable_pointer(&self) -> bool {
match self.sty {
TyRawPtr(tnm) | TyRef(_, tnm) => if let hir::Mutability::MutMutable = tnm.mutbl {
true
} else {
false
},
_ => false
}
}
pub fn is_unsafe_ptr(&self) -> bool {
match self.sty {
TyRawPtr(_) => return true,
_ => return false
}
}
pub fn is_box(&self) -> bool {
match self.sty {
TyAdt(def, _) => def.is_box(),
_ => false,
}
}
pub fn boxed_ty(&self) -> Ty<'tcx> {
match self.sty {
TyAdt(def, substs) if def.is_box() => substs.type_at(0),
_ => bug!("`boxed_ty` is called on non-box type {:?}", self),
}
}
pub fn is_scalar(&self) -> bool {
match self.sty {
TyBool | TyChar | TyInt(_) | TyFloat(_) | TyUint(_) |
TyInfer(IntVar(_)) | TyInfer(FloatVar(_)) |
TyFnDef(..) | TyFnPtr(_) | TyRawPtr(_) => true,
_ => false
}
}
pub fn is_floating_point(&self) -> bool {
match self.sty {
TyFloat(_) |
TyInfer(FloatVar(_)) => true,
_ => false,
}
}
pub fn is_trait(&self) -> bool {
match self.sty {
TyDynamic(..) => true,
_ => false
}
}
pub fn is_integral(&self) -> bool {
match self.sty {
TyInfer(IntVar(_)) | TyInt(_) | TyUint(_) => true,
_ => false
}
}
pub fn is_fresh(&self) -> bool {
match self.sty {
TyInfer(FreshTy(_)) => true,
TyInfer(FreshIntTy(_)) => true,
TyInfer(FreshFloatTy(_)) => true,
_ => false
}
}
pub fn is_uint(&self) -> bool {
match self.sty {
TyInfer(IntVar(_)) | TyUint(ast::UintTy::Us) => true,
_ => false
}
}
pub fn is_char(&self) -> bool {
match self.sty {
TyChar => true,
_ => false
}
}
pub fn is_fp(&self) -> bool {
match self.sty {
TyInfer(FloatVar(_)) | TyFloat(_) => true,
_ => false
}
}
pub fn is_numeric(&self) -> bool {
self.is_integral() || self.is_fp()
}
pub fn is_signed(&self) -> bool {
match self.sty {
TyInt(_) => true,
_ => false
}
}
pub fn is_machine(&self) -> bool {
match self.sty {
TyInt(ast::IntTy::Is) | TyUint(ast::UintTy::Us) => false,
TyInt(..) | TyUint(..) | TyFloat(..) => true,
_ => false
}
}
pub fn has_concrete_skeleton(&self) -> bool {
match self.sty {
TyParam(_) | TyInfer(_) | TyError => false,
_ => true,
}
}
pub fn builtin_deref(&self, explicit: bool, pref: ty::LvaluePreference)
-> Option<TypeAndMut<'tcx>>
{
match self.sty {
TyAdt(def, _) if def.is_box() => {
Some(TypeAndMut {
ty: self.boxed_ty(),
mutbl: if pref == ty::PreferMutLvalue {
hir::MutMutable
} else {
hir::MutImmutable
},
})
},
TyRef(_, mt) => Some(mt),
TyRawPtr(mt) if explicit => Some(mt),
_ => None
}
}
pub fn builtin_index(&self) -> Option<Ty<'tcx>> {
match self.sty {
TyArray(ty, _) | TySlice(ty) => Some(ty),
_ => None
}
}
pub fn fn_sig(&self) -> PolyFnSig<'tcx> {
match self.sty {
TyFnDef(.., f) | TyFnPtr(f) => f,
_ => bug!("Ty::fn_sig() called on non-fn type: {:?}", self)
}
}
pub fn fn_args(&self) -> ty::Binder<&'tcx [Ty<'tcx>]> {
self.fn_sig().inputs()
}
pub fn fn_ret(&self) -> Binder<Ty<'tcx>> {
self.fn_sig().output()
}
pub fn is_fn(&self) -> bool {
match self.sty {
TyFnDef(..) | TyFnPtr(_) => true,
_ => false
}
}
pub fn ty_to_def_id(&self) -> Option<DefId> {
match self.sty {
TyDynamic(ref tt, ..) => tt.principal().map(|p| p.def_id()),
TyAdt(def, _) => Some(def.did),
TyClosure(id, _) => Some(id),
_ => None
}
}
pub fn ty_adt_def(&self) -> Option<&'tcx AdtDef> {
match self.sty {
TyAdt(adt, _) => Some(adt),
_ => None
}
}
pub fn regions(&self) -> Vec<&'tcx ty::Region> {
match self.sty {
TyRef(region, _) => {
vec![region]
}
TyDynamic(ref obj, region) => {
let mut v = vec![region];
if let Some(p) = obj.principal() {
v.extend(p.skip_binder().substs.regions());
}
v
}
TyAdt(_, substs) | TyAnon(_, substs) => {
substs.regions().collect()
}
TyClosure(_, ref substs) => {
substs.substs.regions().collect()
}
TyProjection(ref data) => {
data.trait_ref.substs.regions().collect()
}
TyFnDef(..) |
TyFnPtr(_) |
TyBool |
TyChar |
TyInt(_) |
TyUint(_) |
TyFloat(_) |
TyStr |
TyArray(..) |
TySlice(_) |
TyRawPtr(_) |
TyNever |
TyTuple(..) |
TyParam(_) |
TyInfer(_) |
TyError => {
vec![]
}
}
}
}