Auto merge of #85110 - RalfJung:no-rustc_args_required_const, r=oli-obk

Remove rustc_args_required_const attribute

Now that stdarch no longer needs it (thanks `@Amanieu!),` we can kill the `rustc_args_required_const` attribute. This means that lifetime extension of references to temporaries is the only remaining job that promotion is performing. :-)

r? `@oli-obk`
Fixes https://github.com/rust-lang/rust/issues/69493
This commit is contained in:
bors 2021-05-13 13:37:32 +00:00
commit d2df620789
33 changed files with 111 additions and 613 deletions

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@ -14,7 +14,6 @@ use rustc_middle::ty::cast::{CastTy, IntTy};
use rustc_middle::ty::layout::HasTyCtxt;
use rustc_middle::ty::{self, adjustment::PointerCast, Instance, Ty, TyCtxt};
use rustc_span::source_map::{Span, DUMMY_SP};
use rustc_span::symbol::sym;
use rustc_target::abi::{Abi, Int, LayoutOf, Variants};
impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
@ -187,9 +186,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
mir::CastKind::Pointer(PointerCast::ReifyFnPointer) => {
match *operand.layout.ty.kind() {
ty::FnDef(def_id, substs) => {
if bx.cx().tcx().has_attr(def_id, sym::rustc_args_required_const) {
bug!("reifying a fn ptr that requires const arguments");
}
let instance = ty::Instance::resolve_for_fn_ptr(
bx.tcx(),
ty::ParamEnv::reveal_all(),

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@ -469,7 +469,6 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
// ==========================================================================
rustc_attr!(rustc_promotable, AssumedUsed, template!(Word), IMPL_DETAIL),
rustc_attr!(rustc_args_required_const, AssumedUsed, template!(List: "N"), INTERNAL_UNSTABLE),
rustc_attr!(rustc_legacy_const_generics, AssumedUsed, template!(List: "N"), INTERNAL_UNSTABLE),
// ==========================================================================

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@ -7,7 +7,6 @@ use rustc_middle::mir::CastKind;
use rustc_middle::ty::adjustment::PointerCast;
use rustc_middle::ty::layout::{IntegerExt, TyAndLayout};
use rustc_middle::ty::{self, FloatTy, Ty, TypeAndMut};
use rustc_span::symbol::sym;
use rustc_target::abi::{Integer, LayoutOf, Variants};
use super::{
@ -49,13 +48,6 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
// All reifications must be monomorphic, bail out otherwise.
ensure_monomorphic_enough(*self.tcx, src.layout.ty)?;
if self.tcx.has_attr(def_id, sym::rustc_args_required_const) {
span_bug!(
self.cur_span(),
"reifying a fn ptr that requires const arguments"
);
}
let instance = ty::Instance::resolve_for_fn_ptr(
*self.tcx,
self.param_env,

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@ -305,7 +305,6 @@ where
let base_intern_mode = match intern_kind {
InternKind::Static(mutbl) => InternMode::Static(mutbl),
// `Constant` includes array lengths.
// `Promoted` includes non-`Copy` array initializers and `rustc_args_required_const` arguments.
InternKind::Constant | InternKind::Promoted => InternMode::Const,
};

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@ -5,6 +5,7 @@ use rustc_middle::mir::*;
use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_span::symbol::{sym, Symbol};
use rustc_span::Span;
use rustc_target::spec::abi::Abi;
pub struct LowerIntrinsics;
@ -119,6 +120,9 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
terminator.kind = TerminatorKind::Goto { target };
}
}
_ if intrinsic_name.as_str().starts_with("simd_shuffle") => {
validate_simd_shuffle(tcx, args, terminator.source_info.span);
}
_ => {}
}
}
@ -132,9 +136,19 @@ fn resolve_rust_intrinsic(
) -> Option<(Symbol, SubstsRef<'tcx>)> {
if let ty::FnDef(def_id, substs) = *func_ty.kind() {
let fn_sig = func_ty.fn_sig(tcx);
if fn_sig.abi() == Abi::RustIntrinsic {
if let Abi::RustIntrinsic | Abi::PlatformIntrinsic = fn_sig.abi() {
return Some((tcx.item_name(def_id), substs));
}
}
None
}
fn validate_simd_shuffle(tcx: TyCtxt<'tcx>, args: &[Operand<'tcx>], span: Span) {
match &args[2] {
Operand::Constant(_) => {} // all good
_ => {
let msg = format!("last argument of `simd_shuffle` is required to be a `const` item");
tcx.sess.span_err(span, &msg);
}
}
}

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@ -12,20 +12,16 @@
//! initialization and can otherwise silence errors, if
//! move analysis runs after promotion on broken MIR.
use rustc_ast::LitKind;
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_middle::mir::traversal::ReversePostorder;
use rustc_middle::mir::visit::{MutVisitor, MutatingUseContext, PlaceContext, Visitor};
use rustc_middle::mir::*;
use rustc_middle::ty::cast::CastTy;
use rustc_middle::ty::subst::InternalSubsts;
use rustc_middle::ty::{self, List, TyCtxt, TypeFoldable};
use rustc_span::symbol::sym;
use rustc_span::Span;
use rustc_index::vec::{Idx, IndexVec};
use rustc_target::spec::abi::Abi;
use std::cell::Cell;
use std::{cmp, iter, mem};
@ -36,8 +32,8 @@ use crate::transform::MirPass;
/// A `MirPass` for promotion.
///
/// Promotion is the extraction of promotable temps into separate MIR bodies. This pass also emits
/// errors when promotion of `#[rustc_args_required_const]` arguments fails.
/// Promotion is the extraction of promotable temps into separate MIR bodies so they can have
/// `'static` lifetime.
///
/// After this pass is run, `promoted_fragments` will hold the MIR body corresponding to each
/// newly created `Constant`.
@ -101,47 +97,16 @@ impl TempState {
pub enum Candidate {
/// Borrow of a constant temporary, candidate for lifetime extension.
Ref(Location),
/// Currently applied to function calls where the callee has the unstable
/// `#[rustc_args_required_const]` attribute as well as the SIMD shuffle
/// intrinsic. The intrinsic requires the arguments are indeed constant and
/// the attribute currently provides the semantic requirement that arguments
/// must be constant.
Argument { bb: BasicBlock, index: usize },
}
impl Candidate {
/// Returns `true` if we should use the "explicit" rules for promotability for this `Candidate`.
fn forces_explicit_promotion(&self) -> bool {
match self {
Candidate::Ref(_) => false,
Candidate::Argument { .. } => true,
}
}
fn source_info(&self, body: &Body<'_>) -> SourceInfo {
match self {
Candidate::Ref(location) => *body.source_info(*location),
Candidate::Argument { bb, .. } => *body.source_info(body.terminator_loc(*bb)),
}
}
}
fn args_required_const(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Vec<usize>> {
let attrs = tcx.get_attrs(def_id);
let attr = attrs.iter().find(|a| tcx.sess.check_name(a, sym::rustc_args_required_const))?;
let mut ret = vec![];
for meta in attr.meta_item_list()? {
match meta.literal()?.kind {
LitKind::Int(a, _) => {
ret.push(a as usize);
}
_ => bug!("invalid arg index"),
}
}
Some(ret)
}
struct Collector<'a, 'tcx> {
ccx: &'a ConstCx<'a, 'tcx>,
temps: IndexVec<Local, TempState>,
@ -208,31 +173,6 @@ impl<'tcx> Visitor<'tcx> for Collector<'_, 'tcx> {
_ => {}
}
}
fn visit_terminator(&mut self, terminator: &Terminator<'tcx>, location: Location) {
self.super_terminator(terminator, location);
if let TerminatorKind::Call { ref func, .. } = terminator.kind {
if let ty::FnDef(def_id, _) = *func.ty(self.ccx.body, self.ccx.tcx).kind() {
let fn_sig = self.ccx.tcx.fn_sig(def_id);
if let Abi::RustIntrinsic | Abi::PlatformIntrinsic = fn_sig.abi() {
let name = self.ccx.tcx.item_name(def_id);
// FIXME(eddyb) use `#[rustc_args_required_const(2)]` for shuffles.
if name.as_str().starts_with("simd_shuffle") {
self.candidates.push(Candidate::Argument { bb: location.block, index: 2 });
return; // Don't double count `simd_shuffle` candidates
}
}
if let Some(constant_args) = args_required_const(self.ccx.tcx, def_id) {
for index in constant_args {
self.candidates.push(Candidate::Argument { bb: location.block, index });
}
}
}
}
}
}
pub fn collect_temps_and_candidates(
@ -256,14 +196,6 @@ pub fn collect_temps_and_candidates(
struct Validator<'a, 'tcx> {
ccx: &'a ConstCx<'a, 'tcx>,
temps: &'a IndexVec<Local, TempState>,
/// Explicit promotion happens e.g. for constant arguments declared via
/// `rustc_args_required_const`.
/// Implicit promotion has almost the same rules, except that disallows `const fn`
/// except for those marked `#[rustc_promotable]`. This is to avoid changing
/// a legitimate run-time operation into a failing compile-time operation
/// e.g. due to addresses being compared inside the function.
explicit: bool,
}
impl std::ops::Deref for Validator<'a, 'tcx> {
@ -280,8 +212,6 @@ impl<'tcx> Validator<'_, 'tcx> {
fn validate_candidate(&self, candidate: Candidate) -> Result<(), Unpromotable> {
match candidate {
Candidate::Ref(loc) => {
assert!(!self.explicit);
let statement = &self.body[loc.block].statements[loc.statement_index];
match &statement.kind {
StatementKind::Assign(box (_, Rvalue::Ref(_, kind, place))) => {
@ -310,15 +240,6 @@ impl<'tcx> Validator<'_, 'tcx> {
_ => bug!(),
}
}
Candidate::Argument { bb, index } => {
assert!(self.explicit);
let terminator = self.body[bb].terminator();
match &terminator.kind {
TerminatorKind::Call { args, .. } => self.validate_operand(&args[index]),
_ => bug!(),
}
}
}
}
@ -448,12 +369,10 @@ impl<'tcx> Validator<'_, 'tcx> {
ProjectionElem::ConstantIndex { .. } | ProjectionElem::Subslice { .. } => {}
ProjectionElem::Index(local) => {
if !self.explicit {
let mut promotable = false;
// Only accept if we can predict the index and are indexing an array.
let val = if let TempState::Defined { location: loc, .. } =
self.temps[local]
{
let mut promotable = false;
// Only accept if we can predict the index and are indexing an array.
let val =
if let TempState::Defined { location: loc, .. } = self.temps[local] {
let block = &self.body[loc.block];
if loc.statement_index < block.statements.len() {
let statement = &block.statements[loc.statement_index];
@ -470,28 +389,27 @@ impl<'tcx> Validator<'_, 'tcx> {
} else {
None
};
if let Some(idx) = val {
// Determine the type of the thing we are indexing.
let ty = place_base.ty(self.body, self.tcx).ty;
match ty.kind() {
ty::Array(_, len) => {
// It's an array; determine its length.
if let Some(len) =
len.try_eval_usize(self.tcx, self.param_env)
{
// If the index is in-bounds, go ahead.
if idx < len {
promotable = true;
}
if let Some(idx) = val {
// Determine the type of the thing we are indexing.
let ty = place_base.ty(self.body, self.tcx).ty;
match ty.kind() {
ty::Array(_, len) => {
// It's an array; determine its length.
if let Some(len) = len.try_eval_usize(self.tcx, self.param_env)
{
// If the index is in-bounds, go ahead.
if idx < len {
promotable = true;
}
}
_ => {}
}
}
if !promotable {
return Err(Unpromotable);
_ => {}
}
}
if !promotable {
return Err(Unpromotable);
}
self.validate_local(local)?;
}
@ -636,7 +554,7 @@ impl<'tcx> Validator<'_, 'tcx> {
match op {
BinOp::Div | BinOp::Rem => {
if !self.explicit && lhs_ty.is_integral() {
if lhs_ty.is_integral() {
// Integer division: the RHS must be a non-zero const.
let const_val = match rhs {
Operand::Constant(c) => {
@ -721,13 +639,12 @@ impl<'tcx> Validator<'_, 'tcx> {
) -> Result<(), Unpromotable> {
let fn_ty = callee.ty(self.body, self.tcx);
// When doing explicit promotion and inside const/static items, we promote all (eligible) function calls.
// Inside const/static items, we promote all (eligible) function calls.
// Everywhere else, we require `#[rustc_promotable]` on the callee.
let promote_all_const_fn = self.explicit
|| matches!(
self.const_kind,
Some(hir::ConstContext::Static(_) | hir::ConstContext::Const)
);
let promote_all_const_fn = matches!(
self.const_kind,
Some(hir::ConstContext::Static(_) | hir::ConstContext::Const)
);
if !promote_all_const_fn {
if let ty::FnDef(def_id, _) = *fn_ty.kind() {
// Never promote runtime `const fn` calls of
@ -765,41 +682,12 @@ pub fn validate_candidates(
temps: &IndexVec<Local, TempState>,
candidates: &[Candidate],
) -> Vec<Candidate> {
let mut validator = Validator { ccx, temps, explicit: false };
let validator = Validator { ccx, temps };
candidates
.iter()
.copied()
.filter(|&candidate| {
validator.explicit = candidate.forces_explicit_promotion();
// FIXME(eddyb) also emit the errors for shuffle indices
// and `#[rustc_args_required_const]` arguments here.
let is_promotable = validator.validate_candidate(candidate).is_ok();
// If we use explicit validation, we carry the risk of turning a legitimate run-time
// operation into a failing compile-time operation. Make sure that does not happen
// by asserting that there is no possible run-time behavior here in case promotion
// fails.
if validator.explicit && !is_promotable {
ccx.tcx.sess.delay_span_bug(
ccx.body.span,
"Explicit promotion requested, but failed to promote",
);
}
match candidate {
Candidate::Argument { bb, index } if !is_promotable => {
let span = ccx.body[bb].terminator().source_info.span;
let msg = format!("argument {} is required to be a constant", index + 1);
ccx.tcx.sess.span_err(span, &msg);
}
_ => (),
}
is_promotable
})
.filter(|&candidate| validator.validate_candidate(candidate).is_ok())
.collect()
}
@ -1039,26 +927,6 @@ impl<'a, 'tcx> Promoter<'a, 'tcx> {
_ => bug!(),
}
}
Candidate::Argument { bb, index } => {
let terminator = blocks[bb].terminator_mut();
match terminator.kind {
TerminatorKind::Call { ref mut args, .. } => {
let ty = args[index].ty(local_decls, self.tcx);
let span = terminator.source_info.span;
Rvalue::Use(mem::replace(&mut args[index], promoted_operand(ty, span)))
}
// We expected a `TerminatorKind::Call` for which we'd like to promote an
// argument. `qualify_consts` saw a `TerminatorKind::Call` here, but
// we are seeing a `Goto`. That means that the `promote_temps` method
// already promoted this call away entirely. This case occurs when calling
// a function requiring a constant argument and as that constant value
// providing a value whose computation contains another call to a function
// requiring a constant argument.
TerminatorKind::Goto { .. } => return None,
_ => bug!(),
}
}
}
};
@ -1113,7 +981,6 @@ pub fn promote_candidates<'tcx>(
}
}
}
Candidate::Argument { .. } => {}
}
// Declare return place local so that `mir::Body::new` doesn't complain.

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@ -13,9 +13,7 @@ use rustc_errors::{pluralize, struct_span_err, Applicability};
use rustc_hir as hir;
use rustc_hir::def_id::LocalDefId;
use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
use rustc_hir::{
self, FnSig, ForeignItem, ForeignItemKind, HirId, Item, ItemKind, TraitItem, CRATE_HIR_ID,
};
use rustc_hir::{self, FnSig, ForeignItem, HirId, Item, ItemKind, TraitItem, CRATE_HIR_ID};
use rustc_hir::{MethodKind, Target};
use rustc_session::lint::builtin::{
CONFLICTING_REPR_HINTS, INVALID_DOC_ATTRIBUTES, UNUSED_ATTRIBUTES,
@ -81,9 +79,6 @@ impl CheckAttrVisitor<'tcx> {
sym::doc => self.check_doc_attrs(attr, hir_id, target, &mut specified_inline),
sym::no_link => self.check_no_link(hir_id, &attr, span, target),
sym::export_name => self.check_export_name(hir_id, &attr, span, target),
sym::rustc_args_required_const => {
self.check_rustc_args_required_const(&attr, span, target, item)
}
sym::rustc_layout_scalar_valid_range_start
| sym::rustc_layout_scalar_valid_range_end => {
self.check_rustc_layout_scalar_valid_range(&attr, span, target)
@ -948,79 +943,6 @@ impl CheckAttrVisitor<'tcx> {
}
}
/// Checks if `#[rustc_args_required_const]` is applied to a function and has a valid argument.
fn check_rustc_args_required_const(
&self,
attr: &Attribute,
span: &Span,
target: Target,
item: Option<ItemLike<'_>>,
) -> bool {
let is_function = matches!(target, Target::Fn | Target::Method(..) | Target::ForeignFn);
if !is_function {
self.tcx
.sess
.struct_span_err(attr.span, "attribute should be applied to a function")
.span_label(*span, "not a function")
.emit();
return false;
}
let list = match attr.meta_item_list() {
// The attribute form is validated on AST.
None => return false,
Some(it) => it,
};
let mut invalid_args = vec![];
for meta in list {
if let Some(LitKind::Int(val, _)) = meta.literal().map(|lit| &lit.kind) {
if let Some(ItemLike::Item(Item {
kind: ItemKind::Fn(FnSig { decl, .. }, ..),
..
}))
| Some(ItemLike::ForeignItem(ForeignItem {
kind: ForeignItemKind::Fn(decl, ..),
..
})) = item
{
let arg_count = decl.inputs.len() as u128;
if *val >= arg_count {
let span = meta.span();
self.tcx
.sess
.struct_span_err(span, "index exceeds number of arguments")
.span_label(
span,
format!(
"there {} only {} argument{}",
if arg_count != 1 { "are" } else { "is" },
arg_count,
pluralize!(arg_count)
),
)
.emit();
return false;
}
} else {
bug!("should be a function item");
}
} else {
invalid_args.push(meta.span());
}
}
if !invalid_args.is_empty() {
self.tcx
.sess
.struct_span_err(invalid_args, "arguments should be non-negative integers")
.emit();
false
} else {
true
}
}
fn check_rustc_layout_scalar_valid_range(
&self,
attr: &Attribute,

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@ -994,7 +994,6 @@ symbols! {
rustc_allocator,
rustc_allocator_nounwind,
rustc_allow_const_fn_unstable,
rustc_args_required_const,
rustc_attrs,
rustc_builtin_macro,
rustc_capture_analysis,

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@ -1537,8 +1537,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
}
}
self.check_rustc_args_require_const(def_id, hir_id, span);
debug!("instantiate_value_path: type of {:?} is {:?}", hir_id, ty_substituted);
self.write_substs(hir_id, substs);

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@ -18,7 +18,7 @@ use rustc_middle::ty::adjustment::AllowTwoPhase;
use rustc_middle::ty::fold::TypeFoldable;
use rustc_middle::ty::{self, Ty};
use rustc_session::Session;
use rustc_span::symbol::{sym, Ident};
use rustc_span::symbol::Ident;
use rustc_span::{self, MultiSpan, Span};
use rustc_trait_selection::traits::{self, ObligationCauseCode, StatementAsExpression};
@ -720,34 +720,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
ty
}
pub(in super::super) fn check_rustc_args_require_const(
&self,
def_id: DefId,
hir_id: hir::HirId,
span: Span,
) {
// We're only interested in functions tagged with
// #[rustc_args_required_const], so ignore anything that's not.
if !self.tcx.has_attr(def_id, sym::rustc_args_required_const) {
return;
}
// If our calling expression is indeed the function itself, we're good!
// If not, generate an error that this can only be called directly.
if let Node::Expr(expr) = self.tcx.hir().get(self.tcx.hir().get_parent_node(hir_id)) {
if let ExprKind::Call(ref callee, ..) = expr.kind {
if callee.hir_id == hir_id {
return;
}
}
}
self.tcx.sess.span_err(
span,
"this function can only be invoked directly, not through a function pointer",
);
}
/// A common error is to add an extra semicolon:
///
/// ```

@ -1 +1 @@
Subproject commit 6c4f4e1990b76be8a07bde1956d2e3452fd55ee4
Subproject commit c14e98417feb406df66e821ccd81e1293b4baa6f

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@ -11,7 +11,8 @@ extern "platform-intrinsic" {
fn main() {
unsafe {
let _: I32x2 = simd_shuffle2(I32x2(1, 2), I32x2(3, 4), [0, 0]);
let _: I32x2 = simd_shuffle2(I32x2(1, 2), I32x2(3, 4), [0, 0]);
const IDX: [u32; 2] = [0, 0];
let _: I32x2 = simd_shuffle2(I32x2(1, 2), I32x2(3, 4), IDX);
let _: I32x2 = simd_shuffle2(I32x2(1, 2), I32x2(3, 4), IDX);
}
}

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@ -1,17 +0,0 @@
// check-pass
#![feature(rustc_attrs)]
#[rustc_args_required_const(0)]
pub const fn a(value: u8) -> u8 {
value
}
#[rustc_args_required_const(0)]
pub fn b(_: u8) {
unimplemented!()
}
fn main() {
let _ = b(a(0));
}

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@ -1,11 +0,0 @@
#![feature(rustc_attrs)]
#[rustc_args_required_const(0)]
fn foo(_imm8: i32) {}
fn bar() {
let imm8 = 3;
foo(imm8) //~ ERROR argument 1 is required to be a constant
}
fn main() {}

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@ -1,8 +0,0 @@
error: argument 1 is required to be a constant
--> $DIR/const_arg_local.rs:8:5
|
LL | foo(imm8)
| ^^^^^^^^^
error: aborting due to previous error

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@ -1,10 +0,0 @@
#![feature(rustc_attrs)]
#[rustc_args_required_const(0)]
fn foo(_imm8: i32) {}
fn bar() {
foo(*&mut 42) //~ ERROR argument 1 is required to be a constant
}
fn main() {}

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@ -1,8 +0,0 @@
error: argument 1 is required to be a constant
--> $DIR/const_arg_promotable.rs:7:5
|
LL | foo(*&mut 42)
| ^^^^^^^^^^^^^
error: aborting due to previous error

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@ -1,18 +0,0 @@
// This test is a regression test for a bug where we only checked function calls in no-const
// functions for `rustc_args_required_const` arguments. This meant that even though `bar` needs its
// argument to be const, inside a const fn (callable at runtime), the value for it may come from a
// non-constant (namely an argument to the const fn).
#![feature(rustc_attrs)]
const fn foo(a: i32) {
bar(a); //~ ERROR argument 1 is required to be a constant
}
#[rustc_args_required_const(0)]
const fn bar(_: i32) {}
fn main() {
// this function call will pass a runtime-value (number of program arguments) to `foo`, which
// will in turn forward it to `bar`, which expects a compile-time argument
foo(std::env::args().count() as i32);
}

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@ -1,8 +0,0 @@
error: argument 1 is required to be a constant
--> $DIR/const_arg_promotable2.rs:8:5
|
LL | bar(a);
| ^^^^^^
error: aborting due to previous error

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@ -1,10 +0,0 @@
#![feature(rustc_attrs)]
#[rustc_args_required_const(0)]
fn foo(_imm8: i32) {}
fn bar(imm8: i32) {
foo(imm8) //~ ERROR argument 1 is required to be a constant
}
fn main() {}

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@ -1,8 +0,0 @@
error: argument 1 is required to be a constant
--> $DIR/const_arg_wrapper.rs:7:5
|
LL | foo(imm8)
| ^^^^^^^^^
error: aborting due to previous error

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@ -1,27 +0,0 @@
#![feature(rustc_attrs)]
#[rustc_args_required_const(0)]
fn foo(_a: i32) {
}
#[rustc_args_required_const(1)]
fn bar(_a: i32, _b: i32) {
}
const A: i32 = 3;
const fn baz() -> i32 {
3
}
fn main() {
foo(2);
foo(2 + 3);
const BAZ: i32 = baz();
foo(BAZ);
let a = 4;
foo(A);
foo(a); //~ ERROR: argument 1 is required to be a constant
bar(a, 3);
bar(a, a); //~ ERROR: argument 2 is required to be a constant
}

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@ -1,14 +0,0 @@
error: argument 1 is required to be a constant
--> $DIR/rustc-args-required-const.rs:24:5
|
LL | foo(a);
| ^^^^^^
error: argument 2 is required to be a constant
--> $DIR/rustc-args-required-const.rs:26:5
|
LL | bar(a, a);
| ^^^^^^^^^
error: aborting due to 2 previous errors

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@ -1,32 +0,0 @@
#![feature(rustc_attrs)]
#[rustc_args_required_const(0)] //~ ERROR index exceeds number of arguments
fn foo1() {}
#[rustc_args_required_const(1)] //~ ERROR index exceeds number of arguments
fn foo2(_: u8) {}
#[rustc_args_required_const(a)] //~ ERROR arguments should be non-negative integers
fn foo4() {}
#[rustc_args_required_const(1, a, 2, b)] //~ ERROR arguments should be non-negative integers
fn foo5(_: u8, _: u8, _: u8) {}
#[rustc_args_required_const(0)] //~ ERROR attribute should be applied to a function
struct S;
#[rustc_args_required_const(0usize)] //~ ERROR suffixed literals are not allowed in attributes
fn foo6(_: u8) {}
extern {
#[rustc_args_required_const(1)] //~ ERROR index exceeds number of arguments
fn foo7(_: u8);
}
#[rustc_args_required_const] //~ ERROR malformed `rustc_args_required_const` attribute
fn bar1() {}
#[rustc_args_required_const = 1] //~ ERROR malformed `rustc_args_required_const` attribute
fn bar2() {}
fn main() {}

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@ -1,60 +0,0 @@
error: suffixed literals are not allowed in attributes
--> $DIR/invalid-rustc_args_required_const-arguments.rs:18:29
|
LL | #[rustc_args_required_const(0usize)]
| ^^^^^^
|
= help: instead of using a suffixed literal (`1u8`, `1.0f32`, etc.), use an unsuffixed version (`1`, `1.0`, etc.)
error: malformed `rustc_args_required_const` attribute input
--> $DIR/invalid-rustc_args_required_const-arguments.rs:26:1
|
LL | #[rustc_args_required_const]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[rustc_args_required_const(N)]`
error: malformed `rustc_args_required_const` attribute input
--> $DIR/invalid-rustc_args_required_const-arguments.rs:29:1
|
LL | #[rustc_args_required_const = 1]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[rustc_args_required_const(N)]`
error: index exceeds number of arguments
--> $DIR/invalid-rustc_args_required_const-arguments.rs:3:29
|
LL | #[rustc_args_required_const(0)]
| ^ there are only 0 arguments
error: index exceeds number of arguments
--> $DIR/invalid-rustc_args_required_const-arguments.rs:6:29
|
LL | #[rustc_args_required_const(1)]
| ^ there is only 1 argument
error: arguments should be non-negative integers
--> $DIR/invalid-rustc_args_required_const-arguments.rs:9:29
|
LL | #[rustc_args_required_const(a)]
| ^
error: arguments should be non-negative integers
--> $DIR/invalid-rustc_args_required_const-arguments.rs:12:32
|
LL | #[rustc_args_required_const(1, a, 2, b)]
| ^ ^
error: attribute should be applied to a function
--> $DIR/invalid-rustc_args_required_const-arguments.rs:15:1
|
LL | #[rustc_args_required_const(0)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | struct S;
| --------- not a function
error: index exceeds number of arguments
--> $DIR/invalid-rustc_args_required_const-arguments.rs:22:33
|
LL | #[rustc_args_required_const(1)]
| ^ there is only 1 argument
error: aborting due to 9 previous errors

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@ -1,20 +0,0 @@
// run-pass
// ignore-emscripten FIXME(#45351)
#![feature(platform_intrinsics, repr_simd)]
extern "platform-intrinsic" {
fn simd_shuffle2<T, U>(x: T, y: T, idx: [u32; 2]) -> U;
}
#[repr(simd)]
#[derive(Clone, Copy)]
#[allow(non_camel_case_types)]
struct u64x2(u64, u64);
fn main() {
let a = u64x2(1, 2);
let r: u64x2 = unsafe { simd_shuffle2(a, a, [0-0, 0-0]) };
assert_eq!(r.0, 1);
assert_eq!(r.1, 1);
}

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@ -1,10 +0,0 @@
#![feature(rustc_attrs)]
#[rustc_args_required_const(0)]
fn foo(_a: i32) {
}
fn main() {
let a = foo; //~ ERROR: this function can only be invoked directly
a(2);
}

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@ -1,8 +0,0 @@
error: this function can only be invoked directly, not through a function pointer
--> $DIR/rustc-args-required-const2.rs:8:13
|
LL | let a = foo;
| ^^^
error: aborting due to previous error

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@ -50,25 +50,28 @@ fn main() {
simd_extract::<_, f32>(x, 0);
//~^ ERROR expected return type `i32` (element of input `i32x4`), found `f32`
simd_shuffle2::<i32, i32>(0, 0, [0; 2]);
const IDX2: [u32; 2] = [0; 2];
simd_shuffle2::<i32, i32>(0, 0, IDX2);
//~^ ERROR expected SIMD input type, found non-SIMD `i32`
simd_shuffle4::<i32, i32>(0, 0, [0; 4]);
const IDX4: [u32; 4] = [0; 4];
simd_shuffle4::<i32, i32>(0, 0, IDX4);
//~^ ERROR expected SIMD input type, found non-SIMD `i32`
simd_shuffle8::<i32, i32>(0, 0, [0; 8]);
const IDX8: [u32; 8] = [0; 8];
simd_shuffle8::<i32, i32>(0, 0, IDX8);
//~^ ERROR expected SIMD input type, found non-SIMD `i32`
simd_shuffle2::<_, f32x2>(x, x, [0; 2]);
simd_shuffle2::<_, f32x2>(x, x, IDX2);
//~^ ERROR element type `i32` (element of input `i32x4`), found `f32x2` with element type `f32`
simd_shuffle4::<_, f32x4>(x, x, [0; 4]);
simd_shuffle4::<_, f32x4>(x, x, IDX4);
//~^ ERROR element type `i32` (element of input `i32x4`), found `f32x4` with element type `f32`
simd_shuffle8::<_, f32x8>(x, x, [0; 8]);
simd_shuffle8::<_, f32x8>(x, x, IDX8);
//~^ ERROR element type `i32` (element of input `i32x4`), found `f32x8` with element type `f32`
simd_shuffle2::<_, i32x8>(x, x, [0; 2]);
simd_shuffle2::<_, i32x8>(x, x, IDX2);
//~^ ERROR expected return type of length 2, found `i32x8` with length 8
simd_shuffle4::<_, i32x8>(x, x, [0; 4]);
simd_shuffle4::<_, i32x8>(x, x, IDX4);
//~^ ERROR expected return type of length 4, found `i32x8` with length 8
simd_shuffle8::<_, i32x2>(x, x, [0; 8]);
simd_shuffle8::<_, i32x2>(x, x, IDX8);
//~^ ERROR expected return type of length 8, found `i32x2` with length 2
}
}

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@ -17,58 +17,58 @@ LL | simd_extract::<_, f32>(x, 0);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0511]: invalid monomorphization of `simd_shuffle2` intrinsic: expected SIMD input type, found non-SIMD `i32`
--> $DIR/simd-intrinsic-generic-elements.rs:53:9
--> $DIR/simd-intrinsic-generic-elements.rs:54:9
|
LL | simd_shuffle2::<i32, i32>(0, 0, [0; 2]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | simd_shuffle2::<i32, i32>(0, 0, IDX2);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0511]: invalid monomorphization of `simd_shuffle4` intrinsic: expected SIMD input type, found non-SIMD `i32`
--> $DIR/simd-intrinsic-generic-elements.rs:55:9
|
LL | simd_shuffle4::<i32, i32>(0, 0, [0; 4]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0511]: invalid monomorphization of `simd_shuffle8` intrinsic: expected SIMD input type, found non-SIMD `i32`
--> $DIR/simd-intrinsic-generic-elements.rs:57:9
|
LL | simd_shuffle8::<i32, i32>(0, 0, [0; 8]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | simd_shuffle4::<i32, i32>(0, 0, IDX4);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0511]: invalid monomorphization of `simd_shuffle2` intrinsic: expected return element type `i32` (element of input `i32x4`), found `f32x2` with element type `f32`
error[E0511]: invalid monomorphization of `simd_shuffle8` intrinsic: expected SIMD input type, found non-SIMD `i32`
--> $DIR/simd-intrinsic-generic-elements.rs:60:9
|
LL | simd_shuffle2::<_, f32x2>(x, x, [0; 2]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | simd_shuffle8::<i32, i32>(0, 0, IDX8);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0511]: invalid monomorphization of `simd_shuffle2` intrinsic: expected return element type `i32` (element of input `i32x4`), found `f32x2` with element type `f32`
--> $DIR/simd-intrinsic-generic-elements.rs:63:9
|
LL | simd_shuffle2::<_, f32x2>(x, x, IDX2);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0511]: invalid monomorphization of `simd_shuffle4` intrinsic: expected return element type `i32` (element of input `i32x4`), found `f32x4` with element type `f32`
--> $DIR/simd-intrinsic-generic-elements.rs:62:9
--> $DIR/simd-intrinsic-generic-elements.rs:65:9
|
LL | simd_shuffle4::<_, f32x4>(x, x, [0; 4]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | simd_shuffle4::<_, f32x4>(x, x, IDX4);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0511]: invalid monomorphization of `simd_shuffle8` intrinsic: expected return element type `i32` (element of input `i32x4`), found `f32x8` with element type `f32`
--> $DIR/simd-intrinsic-generic-elements.rs:64:9
|
LL | simd_shuffle8::<_, f32x8>(x, x, [0; 8]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0511]: invalid monomorphization of `simd_shuffle2` intrinsic: expected return type of length 2, found `i32x8` with length 8
--> $DIR/simd-intrinsic-generic-elements.rs:67:9
|
LL | simd_shuffle2::<_, i32x8>(x, x, [0; 2]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | simd_shuffle8::<_, f32x8>(x, x, IDX8);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0511]: invalid monomorphization of `simd_shuffle2` intrinsic: expected return type of length 2, found `i32x8` with length 8
--> $DIR/simd-intrinsic-generic-elements.rs:70:9
|
LL | simd_shuffle2::<_, i32x8>(x, x, IDX2);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0511]: invalid monomorphization of `simd_shuffle4` intrinsic: expected return type of length 4, found `i32x8` with length 8
--> $DIR/simd-intrinsic-generic-elements.rs:69:9
--> $DIR/simd-intrinsic-generic-elements.rs:72:9
|
LL | simd_shuffle4::<_, i32x8>(x, x, [0; 4]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | simd_shuffle4::<_, i32x8>(x, x, IDX4);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0511]: invalid monomorphization of `simd_shuffle8` intrinsic: expected return type of length 8, found `i32x2` with length 2
--> $DIR/simd-intrinsic-generic-elements.rs:71:9
--> $DIR/simd-intrinsic-generic-elements.rs:74:9
|
LL | simd_shuffle8::<_, i32x2>(x, x, [0; 8]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | simd_shuffle8::<_, i32x2>(x, x, IDX8);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 12 previous errors

View File

@ -21,5 +21,6 @@ fn main() {
#[inline(always)]
unsafe fn inline_me() -> Simd2 {
simd_shuffle2(Simd2(10, 11), Simd2(12, 13), [0, 3])
const IDX: [u32; 2] = [0, 3];
simd_shuffle2(Simd2(10, 11), Simd2(12, 13), IDX)
}

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@ -15,7 +15,8 @@ struct Simd2(u8, u8);
fn main() {
unsafe {
let p_res: Simd2 = simd_shuffle2(Simd2(10, 11), Simd2(12, 13), [0, 1]);
const IDX: [u32; 2] = [0, 1];
let p_res: Simd2 = simd_shuffle2(Simd2(10, 11), Simd2(12, 13), IDX);
let a_res: Simd2 = inline_me();
assert_10_11(p_res);
@ -36,5 +37,6 @@ fn assert_10_13(x: Simd2) {
#[inline(always)]
unsafe fn inline_me() -> Simd2 {
simd_shuffle2(Simd2(10, 11), Simd2(12, 13), [0, 3])
const IDX: [u32; 2] = [0, 3];
simd_shuffle2(Simd2(10, 11), Simd2(12, 13), IDX)
}

View File

@ -2,6 +2,8 @@
// ignore-emscripten FIXME(#45351) hits an LLVM assert
#![feature(repr_simd, platform_intrinsics)]
#![allow(incomplete_features)]
#![feature(inline_const)]
#[repr(simd)]
#[derive(Copy, Clone, Debug, PartialEq)]
@ -82,19 +84,19 @@ fn main() {
let y4 = i32x4(140, 141, 142, 143);
let y8 = i32x8(180, 181, 182, 183, 184, 185, 186, 187);
unsafe {
all_eq!(simd_shuffle2(x2, y2, [3, 0]), i32x2(121, 20));
all_eq!(simd_shuffle4(x2, y2, [3, 0, 1, 2]), i32x4(121, 20, 21, 120));
all_eq!(simd_shuffle8(x2, y2, [3, 0, 1, 2, 1, 2, 3, 0]),
all_eq!(simd_shuffle2(x2, y2, const { [3u32, 0] }), i32x2(121, 20));
all_eq!(simd_shuffle4(x2, y2, const { [3u32, 0, 1, 2] }), i32x4(121, 20, 21, 120));
all_eq!(simd_shuffle8(x2, y2, const { [3u32, 0, 1, 2, 1, 2, 3, 0] }),
i32x8(121, 20, 21, 120, 21, 120, 121, 20));
all_eq!(simd_shuffle2(x4, y4, [7, 2]), i32x2(143, 42));
all_eq!(simd_shuffle4(x4, y4, [7, 2, 5, 0]), i32x4(143, 42, 141, 40));
all_eq!(simd_shuffle8(x4, y4, [7, 2, 5, 0, 3, 6, 4, 1]),
all_eq!(simd_shuffle2(x4, y4, const { [7u32, 2] }), i32x2(143, 42));
all_eq!(simd_shuffle4(x4, y4, const { [7u32, 2, 5, 0] }), i32x4(143, 42, 141, 40));
all_eq!(simd_shuffle8(x4, y4, const { [7u32, 2, 5, 0, 3, 6, 4, 1] }),
i32x8(143, 42, 141, 40, 43, 142, 140, 41));
all_eq!(simd_shuffle2(x8, y8, [11, 5]), i32x2(183, 85));
all_eq!(simd_shuffle4(x8, y8, [11, 5, 15, 0]), i32x4(183, 85, 187, 80));
all_eq!(simd_shuffle8(x8, y8, [11, 5, 15, 0, 3, 8, 12, 1]),
all_eq!(simd_shuffle2(x8, y8, const { [11u32, 5] }), i32x2(183, 85));
all_eq!(simd_shuffle4(x8, y8, const { [11u32, 5, 15, 0] }), i32x4(183, 85, 187, 80));
all_eq!(simd_shuffle8(x8, y8, const { [11u32, 5, 15, 0, 3, 8, 12, 1] }),
i32x8(183, 85, 187, 80, 83, 180, 184, 81));
}