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Move InlineAsmTemplatePiece and InlineAsmOptions to librustc_ast

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This commit is contained in:
Amanieu d'Antras 2020-05-06 14:46:01 +01:00
parent 330bdf89b1
commit a656349b55
20 changed files with 108 additions and 105 deletions
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2
Cargo.lock
View File

@ -3625,13 +3625,13 @@ dependencies = [
name = "rustc_ast"
version = "0.0.0"
dependencies = [
"bitflags",
"log",
"rustc_data_structures",
"rustc_index",
"rustc_lexer",
"rustc_macros",
"rustc_span",
"rustc_target",
"scoped-tls",
"serialize",
"smallvec 1.4.0",

2
src/librustc_ast/Cargo.toml
View File

@ -19,4 +19,4 @@ rustc_index = { path = "../librustc_index" }
rustc_lexer = { path = "../librustc_lexer" }
rustc_macros = { path = "../librustc_macros" }
smallvec = { version = "1.0", features = ["union", "may_dangle"] }
rustc_target = { path = "../librustc_target" }
bitflags = "1.2.1"

55
src/librustc_ast/ast.rs
View File

@ -34,7 +34,6 @@ use rustc_serialize::{self, Decoder, Encoder};
use rustc_span::source_map::{respan, Spanned};
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::{Span, DUMMY_SP};
use rustc_target::asm::{InlineAsmOptions, InlineAsmTemplatePiece};
use std::convert::TryFrom;
use std::fmt;
@ -1876,6 +1875,60 @@ pub enum InlineAsmRegOrRegClass {
RegClass(Symbol),
}
bitflags::bitflags! {
#[derive(RustcEncodable, RustcDecodable, HashStable_Generic)]
pub struct InlineAsmOptions: u8 {
const PURE = 1 << 0;
const NOMEM = 1 << 1;
const READONLY = 1 << 2;
const PRESERVES_FLAGS = 1 << 3;
const NORETURN = 1 << 4;
const NOSTACK = 1 << 5;
const ATT_SYNTAX = 1 << 6;
}
}
#[derive(Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)]
pub enum InlineAsmTemplatePiece {
String(String),
Placeholder { operand_idx: usize, modifier: Option<char>, span: Span },
}
impl fmt::Display for InlineAsmTemplatePiece {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::String(s) => {
for c in s.chars() {
match c {
'{' => f.write_str("{{")?,
'}' => f.write_str("}}")?,
_ => write!(f, "{}", c.escape_debug())?,
}
}
Ok(())
}
Self::Placeholder { operand_idx, modifier: Some(modifier), .. } => {
write!(f, "{{{}:{}}}", operand_idx, modifier)
}
Self::Placeholder { operand_idx, modifier: None, .. } => {
write!(f, "{{{}}}", operand_idx)
}
}
}
}
impl InlineAsmTemplatePiece {
/// Rebuilds the asm template string from its pieces.
pub fn to_string(s: &[Self]) -> String {
use fmt::Write;
let mut out = String::new();
for p in s.iter() {
let _ = write!(out, "{}", p);
}
out
}
}
/// Inline assembly operand.
///
/// E.g., `out("eax") result` as in `asm!("mov eax, 2", out("eax") result)`.

4
src/librustc_ast_lowering/expr.rs
View File

@ -980,7 +980,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
struct_span_err!(self.sess, sp, E0472, "asm! is unsupported on this target").emit();
return hir::ExprKind::Err;
};
if asm.options.contains(asm::InlineAsmOptions::ATT_SYNTAX) {
if asm.options.contains(InlineAsmOptions::ATT_SYNTAX) {
match asm_arch {
asm::InlineAsmArch::X86 | asm::InlineAsmArch::X86_64 => {}
_ => self
@ -1070,7 +1070,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
// Validate template modifiers against the register classes for the operands
for p in &asm.template {
if let asm::InlineAsmTemplatePiece::Placeholder {
if let InlineAsmTemplatePiece::Placeholder {
operand_idx,
modifier: Some(modifier),
span: placeholder_span,

2
src/librustc_ast_pretty/pprust.rs
View File

@ -5,6 +5,7 @@ use rustc_ast::ast::{self, BlockCheckMode, PatKind, RangeEnd, RangeSyntax};
use rustc_ast::ast::{Attribute, GenericArg, MacArgs};
use rustc_ast::ast::{GenericBound, SelfKind, TraitBoundModifier};
use rustc_ast::ast::{InlineAsmOperand, InlineAsmRegOrRegClass};
use rustc_ast::ast::{InlineAsmOptions, InlineAsmTemplatePiece};
use rustc_ast::attr;
use rustc_ast::ptr::P;
use rustc_ast::token::{self, BinOpToken, DelimToken, Nonterminal, Token, TokenKind};
@ -15,7 +16,6 @@ use rustc_span::edition::Edition;
use rustc_span::source_map::{SourceMap, Spanned};
use rustc_span::symbol::{kw, sym, Ident, IdentPrinter, Symbol};
use rustc_span::{BytePos, FileName, Span};
use rustc_target::asm::{InlineAsmOptions, InlineAsmTemplatePiece};
use std::borrow::Cow;

41
src/librustc_builtin_macros/asm.rs
View File

@ -10,14 +10,13 @@ use rustc_expand::base::{self, *};
use rustc_parse::parser::Parser;
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_span::{InnerSpan, Span};
use rustc_target::asm::{InlineAsmOptions, InlineAsmTemplatePiece};
struct AsmArgs {
template: P<ast::Expr>,
operands: Vec<(ast::InlineAsmOperand, Span)>,
named_args: FxHashMap<Symbol, usize>,
reg_args: FxHashSet<usize>,
options: InlineAsmOptions,
options: ast::InlineAsmOptions,
options_span: Option<Span>,
}
@ -57,7 +56,7 @@ fn parse_args<'a>(
operands: vec![],
named_args: FxHashMap::default(),
reg_args: FxHashSet::default(),
options: InlineAsmOptions::empty(),
options: ast::InlineAsmOptions::empty(),
options_span: None,
};
@ -204,22 +203,22 @@ fn parse_args<'a>(
}
}
if args.options.contains(InlineAsmOptions::NOMEM)
&& args.options.contains(InlineAsmOptions::READONLY)
if args.options.contains(ast::InlineAsmOptions::NOMEM)
&& args.options.contains(ast::InlineAsmOptions::READONLY)
{
let span = args.options_span.unwrap();
ecx.struct_span_err(span, "the `nomem` and `readonly` options are mutually exclusive")
.emit();
}
if args.options.contains(InlineAsmOptions::PURE)
&& args.options.contains(InlineAsmOptions::NORETURN)
if args.options.contains(ast::InlineAsmOptions::PURE)
&& args.options.contains(ast::InlineAsmOptions::NORETURN)
{
let span = args.options_span.unwrap();
ecx.struct_span_err(span, "the `pure` and `noreturn` options are mutually exclusive")
.emit();
}
if args.options.contains(InlineAsmOptions::PURE)
&& !args.options.intersects(InlineAsmOptions::NOMEM | InlineAsmOptions::READONLY)
if args.options.contains(ast::InlineAsmOptions::PURE)
&& !args.options.intersects(ast::InlineAsmOptions::NOMEM | ast::InlineAsmOptions::READONLY)
{
let span = args.options_span.unwrap();
ecx.struct_span_err(
@ -245,14 +244,14 @@ fn parse_args<'a>(
_ => {}
}
}
if args.options.contains(InlineAsmOptions::PURE) && !have_real_output {
if args.options.contains(ast::InlineAsmOptions::PURE) && !have_real_output {
ecx.struct_span_err(
args.options_span.unwrap(),
"asm with `pure` option must have at least one output",
)
.emit();
}
if args.options.contains(InlineAsmOptions::NORETURN) && !outputs_sp.is_empty() {
if args.options.contains(ast::InlineAsmOptions::NORETURN) && !outputs_sp.is_empty() {
let err = ecx
.struct_span_err(outputs_sp, "asm outputs are not allowed with the `noreturn` option");
@ -270,20 +269,20 @@ fn parse_options<'a>(p: &mut Parser<'a>, args: &mut AsmArgs) -> Result<(), Diagn
while !p.eat(&token::CloseDelim(token::DelimToken::Paren)) {
if p.eat(&token::Ident(sym::pure, false)) {
args.options |= InlineAsmOptions::PURE;
args.options |= ast::InlineAsmOptions::PURE;
} else if p.eat(&token::Ident(sym::nomem, false)) {
args.options |= InlineAsmOptions::NOMEM;
args.options |= ast::InlineAsmOptions::NOMEM;
} else if p.eat(&token::Ident(sym::readonly, false)) {
args.options |= InlineAsmOptions::READONLY;
args.options |= ast::InlineAsmOptions::READONLY;
} else if p.eat(&token::Ident(sym::preserves_flags, false)) {
args.options |= InlineAsmOptions::PRESERVES_FLAGS;
args.options |= ast::InlineAsmOptions::PRESERVES_FLAGS;
} else if p.eat(&token::Ident(sym::noreturn, false)) {
args.options |= InlineAsmOptions::NORETURN;
args.options |= ast::InlineAsmOptions::NORETURN;
} else if p.eat(&token::Ident(sym::nostack, false)) {
args.options |= InlineAsmOptions::NOSTACK;
args.options |= ast::InlineAsmOptions::NOSTACK;
} else {
p.expect(&token::Ident(sym::att_syntax, false))?;
args.options |= InlineAsmOptions::ATT_SYNTAX;
args.options |= ast::InlineAsmOptions::ATT_SYNTAX;
}
// Allow trailing commas
@ -395,7 +394,9 @@ fn expand_preparsed_asm(ecx: &mut ExtCtxt<'_>, sp: Span, args: AsmArgs) -> P<ast
let mut template = vec![];
for piece in unverified_pieces {
match piece {
parse::Piece::String(s) => template.push(InlineAsmTemplatePiece::String(s.to_string())),
parse::Piece::String(s) => {
template.push(ast::InlineAsmTemplatePiece::String(s.to_string()))
}
parse::Piece::NextArgument(arg) => {
let span = arg_spans.next().unwrap_or(template_sp);
@ -467,7 +468,7 @@ fn expand_preparsed_asm(ecx: &mut ExtCtxt<'_>, sp: Span, args: AsmArgs) -> P<ast
if let Some(operand_idx) = operand_idx {
used[operand_idx] = true;
template.push(InlineAsmTemplatePiece::Placeholder {
template.push(ast::InlineAsmTemplatePiece::Placeholder {
operand_idx,
modifier,
span,

1
src/librustc_codegen_llvm/asm.rs
View File

@ -6,6 +6,7 @@ use crate::type_of::LayoutLlvmExt;
use crate::value::Value;
use rustc_ast::ast::LlvmAsmDialect;
use rustc_ast::ast::{InlineAsmOptions, InlineAsmTemplatePiece};
use rustc_codegen_ssa::mir::operand::OperandValue;
use rustc_codegen_ssa::mir::place::PlaceRef;
use rustc_codegen_ssa::traits::*;

3
src/librustc_codegen_ssa/traits/asm.rs
View File

@ -1,11 +1,12 @@
use super::BackendTypes;
use crate::mir::operand::OperandRef;
use crate::mir::place::PlaceRef;
use rustc_ast::ast::{InlineAsmOptions, InlineAsmTemplatePiece};
use rustc_hir::def_id::DefId;
use rustc_hir::{GlobalAsm, LlvmInlineAsmInner};
use rustc_middle::ty::Instance;
use rustc_span::Span;
use rustc_target::asm::{InlineAsmOptions, InlineAsmRegOrRegClass, InlineAsmTemplatePiece};
use rustc_target::asm::InlineAsmRegOrRegClass;
#[derive(Debug)]
pub enum InlineAsmOperandRef<'tcx, B: BackendTypes + ?Sized> {

2
src/librustc_hir/arena.rs
View File

@ -15,7 +15,7 @@ macro_rules! arena_types {
[few] hir_krate: rustc_hir::Crate<$tcx>,
[] arm: rustc_hir::Arm<$tcx>,
[] asm_operand: rustc_hir::InlineAsmOperand<$tcx>,
[] asm_template: rustc_target::asm::InlineAsmTemplatePiece,
[] asm_template: rustc_ast::ast::InlineAsmTemplatePiece,
[] attribute: rustc_ast::ast::Attribute,
[] block: rustc_hir::Block<$tcx>,
[] bare_fn_ty: rustc_hir::BareFnTy<$tcx>,

3
src/librustc_hir/hir.rs
View File

@ -7,6 +7,7 @@ use rustc_ast::ast::{self, CrateSugar, LlvmAsmDialect};
use rustc_ast::ast::{AttrVec, Attribute, FloatTy, IntTy, Label, LitKind, StrStyle, UintTy};
pub use rustc_ast::ast::{BorrowKind, ImplPolarity, IsAuto};
pub use rustc_ast::ast::{CaptureBy, Movability, Mutability};
use rustc_ast::ast::{InlineAsmOptions, InlineAsmTemplatePiece};
use rustc_ast::node_id::NodeMap;
use rustc_ast::util::parser::ExprPrecedence;
use rustc_data_structures::fx::FxHashSet;
@ -15,7 +16,7 @@ use rustc_macros::HashStable_Generic;
use rustc_span::source_map::{SourceMap, Spanned};
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::{MultiSpan, Span, DUMMY_SP};
use rustc_target::asm::{InlineAsmOptions, InlineAsmRegOrRegClass, InlineAsmTemplatePiece};
use rustc_target::asm::InlineAsmRegOrRegClass;
use rustc_target::spec::abi::Abi;
use smallvec::SmallVec;

19
src/librustc_hir_pretty/lib.rs
View File

@ -12,7 +12,6 @@ use rustc_hir::{GenericBound, PatKind, RangeEnd, TraitBoundModifier};
use rustc_span::source_map::{SourceMap, Spanned};
use rustc_span::symbol::{kw, Ident, IdentPrinter, Symbol};
use rustc_span::{self, BytePos, FileName};
use rustc_target::asm::{InlineAsmOptions, InlineAsmTemplatePiece};
use rustc_target::spec::abi::Abi;
use std::borrow::Cow;
@ -1414,11 +1413,11 @@ impl<'a> State<'a> {
enum AsmArg<'a> {
Template(String),
Operand(&'a hir::InlineAsmOperand<'a>),
Options(InlineAsmOptions),
Options(ast::InlineAsmOptions),
}
let mut args = vec![];
args.push(AsmArg::Template(InlineAsmTemplatePiece::to_string(&a.template)));
args.push(AsmArg::Template(ast::InlineAsmTemplatePiece::to_string(&a.template)));
args.extend(a.operands.iter().map(|o| AsmArg::Operand(o)));
if !a.options.is_empty() {
args.push(AsmArg::Options(a.options));
@ -1485,25 +1484,25 @@ impl<'a> State<'a> {
s.word("options");
s.popen();
let mut options = vec![];
if opts.contains(InlineAsmOptions::PURE) {
if opts.contains(ast::InlineAsmOptions::PURE) {
options.push("pure");
}
if opts.contains(InlineAsmOptions::NOMEM) {
if opts.contains(ast::InlineAsmOptions::NOMEM) {
options.push("nomem");
}
if opts.contains(InlineAsmOptions::READONLY) {
if opts.contains(ast::InlineAsmOptions::READONLY) {
options.push("readonly");
}
if opts.contains(InlineAsmOptions::PRESERVES_FLAGS) {
if opts.contains(ast::InlineAsmOptions::PRESERVES_FLAGS) {
options.push("preserves_flags");
}
if opts.contains(InlineAsmOptions::NORETURN) {
if opts.contains(ast::InlineAsmOptions::NORETURN) {
options.push("noreturn");
}
if opts.contains(InlineAsmOptions::NOSTACK) {
if opts.contains(ast::InlineAsmOptions::NOSTACK) {
options.push("nostack");
}
if opts.contains(InlineAsmOptions::ATT_SYNTAX) {
if opts.contains(ast::InlineAsmOptions::ATT_SYNTAX) {
options.push("att_syntax");
}
s.commasep(Inconsistent, &options, |s, &opt| {

3
src/librustc_middle/mir/mod.rs
View File

@ -19,6 +19,7 @@ use rustc_target::abi::VariantIdx;
use polonius_engine::Atom;
pub use rustc_ast::ast::Mutability;
use rustc_ast::ast::{InlineAsmOptions, InlineAsmTemplatePiece};
use rustc_data_structures::fx::FxHashSet;
use rustc_data_structures::graph::dominators::{dominators, Dominators};
use rustc_data_structures::graph::{self, GraphSuccessors};
@ -28,7 +29,7 @@ use rustc_macros::HashStable;
use rustc_serialize::{Decodable, Encodable};
use rustc_span::symbol::Symbol;
use rustc_span::{Span, DUMMY_SP};
use rustc_target::asm::{InlineAsmOptions, InlineAsmRegOrRegClass, InlineAsmTemplatePiece};
use rustc_target::asm::InlineAsmRegOrRegClass;
use std::borrow::Cow;
use std::fmt::{self, Debug, Display, Formatter, Write};
use std::ops::{Index, IndexMut};

4
src/librustc_middle/ty/structural_impls.rs
View File

@ -259,6 +259,8 @@ CloneTypeFoldableAndLiftImpls! {
String,
crate::middle::region::Scope,
::rustc_ast::ast::FloatTy,
::rustc_ast::ast::InlineAsmOptions,
::rustc_ast::ast::InlineAsmTemplatePiece,
::rustc_ast::ast::NodeId,
::rustc_span::symbol::Symbol,
::rustc_hir::def::Res,
@ -267,9 +269,7 @@ CloneTypeFoldableAndLiftImpls! {
::rustc_hir::MatchSource,
::rustc_hir::Mutability,
::rustc_hir::Unsafety,
::rustc_target::asm::InlineAsmOptions,
::rustc_target::asm::InlineAsmRegOrRegClass,
::rustc_target::asm::InlineAsmTemplatePiece,
::rustc_target::spec::abi::Abi,
crate::mir::Local,
crate::mir::Promoted,

2
src/librustc_mir_build/build/expr/into.rs
View File

@ -3,12 +3,12 @@
use crate::build::expr::category::{Category, RvalueFunc};
use crate::build::{BlockAnd, BlockAndExtension, BlockFrame, Builder};
use crate::hair::*;
use rustc_ast::ast::InlineAsmOptions;
use rustc_data_structures::fx::FxHashMap;
use rustc_hir as hir;
use rustc_middle::mir::*;
use rustc_middle::ty::{self, CanonicalUserTypeAnnotation};
use rustc_span::symbol::sym;
use rustc_target::asm::InlineAsmOptions;
use rustc_target::spec::abi::Abi;

3
src/librustc_mir_build/hair/mod.rs
View File

@ -5,6 +5,7 @@
//! structures.
use self::cx::Cx;
use rustc_ast::ast::{InlineAsmOptions, InlineAsmTemplatePiece};
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_middle::infer::canonical::Canonical;
@ -15,7 +16,7 @@ use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::{AdtDef, Const, Ty, UpvarSubsts, UserType};
use rustc_span::Span;
use rustc_target::abi::VariantIdx;
use rustc_target::asm::{InlineAsmOptions, InlineAsmRegOrRegClass, InlineAsmTemplatePiece};
use rustc_target::asm::InlineAsmRegOrRegClass;
crate mod constant;
crate mod cx;

4
src/librustc_passes/intrinsicck.rs
View File

@ -1,4 +1,4 @@
use rustc_ast::ast::{FloatTy, IntTy, UintTy};
use rustc_ast::ast::{FloatTy, InlineAsmTemplatePiece, IntTy, UintTy};
use rustc_errors::struct_span_err;
use rustc_hir as hir;
use rustc_hir::def::{DefKind, Res};
@ -11,7 +11,7 @@ use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_session::lint;
use rustc_span::{sym, Span, Symbol, DUMMY_SP};
use rustc_target::abi::{Pointer, VariantIdx};
use rustc_target::asm::{InlineAsmRegOrRegClass, InlineAsmTemplatePiece, InlineAsmType};
use rustc_target::asm::{InlineAsmRegOrRegClass, InlineAsmType};
use rustc_target::spec::abi::Abi::RustIntrinsic;
fn check_mod_intrinsics(tcx: TyCtxt<'_>, module_def_id: DefId) {

2
src/librustc_passes/liveness.rs
View File

@ -96,6 +96,7 @@
use self::LiveNodeKind::*;
use self::VarKind::*;
use rustc_ast::ast::InlineAsmOptions;
use rustc_data_structures::fx::FxIndexMap;
use rustc_errors::Applicability;
use rustc_hir as hir;
@ -109,7 +110,6 @@ use rustc_middle::ty::{self, TyCtxt};
use rustc_session::lint;
use rustc_span::symbol::{sym, Symbol};
use rustc_span::Span;
use rustc_target::asm::InlineAsmOptions;
use std::collections::VecDeque;
use std::fmt;

56
src/librustc_target/asm/mod.rs
View File

@ -1,7 +1,7 @@
use crate::abi::Size;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_macros::HashStable_Generic;
use rustc_span::{Span, Symbol};
use rustc_span::Symbol;
use std::fmt;
use std::str::FromStr;
@ -417,60 +417,6 @@ impl fmt::Display for InlineAsmRegOrRegClass {
}
}
bitflags::bitflags! {
#[derive(RustcEncodable, RustcDecodable, HashStable_Generic)]
pub struct InlineAsmOptions: u8 {
const PURE = 1 << 0;
const NOMEM = 1 << 1;
const READONLY = 1 << 2;
const PRESERVES_FLAGS = 1 << 3;
const NORETURN = 1 << 4;
const NOSTACK = 1 << 5;
const ATT_SYNTAX = 1 << 6;
}
}
#[derive(Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)]
pub enum InlineAsmTemplatePiece {
String(String),
Placeholder { operand_idx: usize, modifier: Option<char>, span: Span },
}
impl fmt::Display for InlineAsmTemplatePiece {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::String(s) => {
for c in s.chars() {
match c {
'{' => f.write_str("{{")?,
'}' => f.write_str("}}")?,
_ => write!(f, "{}", c.escape_debug())?,
}
}
Ok(())
}
Self::Placeholder { operand_idx, modifier: Some(modifier), .. } => {
write!(f, "{{{}:{}}}", operand_idx, modifier)
}
Self::Placeholder { operand_idx, modifier: None, .. } => {
write!(f, "{{{}}}", operand_idx)
}
}
}
}
impl InlineAsmTemplatePiece {
/// Rebuilds the asm template string from its pieces.
pub fn to_string(s: &[Self]) -> String {
use fmt::Write;
let mut out = String::new();
for p in s.iter() {
let _ = write!(out, "{}", p);
}
out
}
}
/// Set of types which can be used with a particular register class.
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum InlineAsmType {

2
src/librustc_target/lib.rs
View File

@ -31,4 +31,4 @@ pub mod spec;
/// Requirements for a `StableHashingContext` to be used in this crate.
/// This is a hack to allow using the `HashStable_Generic` derive macro
/// instead of implementing everything in librustc_middle.
pub trait HashStableContext: rustc_span::HashStableContext {}
pub trait HashStableContext {}

3
src/librustc_typeck/check/expr.rs
View File

@ -38,7 +38,6 @@ use rustc_middle::ty::{AdtKind, Visibility};
use rustc_span::hygiene::DesugaringKind;
use rustc_span::source_map::Span;
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_target::asm::InlineAsmOptions;
use rustc_trait_selection::traits::{self, ObligationCauseCode};
use std::fmt::Display;
@ -1873,7 +1872,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
}
}
}
if asm.options.contains(InlineAsmOptions::NORETURN) {
if asm.options.contains(ast::InlineAsmOptions::NORETURN) {
self.tcx.types.never
} else {
self.tcx.mk_unit()