diff --git a/Cargo.lock b/Cargo.lock
index 9464c87fc728b..790178668cee1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4601,6 +4601,7 @@ dependencies = [
"rustc_hir",
"rustc_index",
"rustc_infer",
+ "rustc_macros",
"rustc_middle",
"rustc_session",
"rustc_span",
diff --git a/compiler/rustc_error_messages/locales/en-US/ty_utils.ftl b/compiler/rustc_error_messages/locales/en-US/ty_utils.ftl
new file mode 100644
index 0000000000000..1040ee1c97d81
--- /dev/null
+++ b/compiler/rustc_error_messages/locales/en-US/ty_utils.ftl
@@ -0,0 +1,47 @@
+ty_utils_needs_drop_overflow = overflow while checking whether `{$query_ty}` requires drop
+
+ty_utils_generic_constant_too_complex = overly complex generic constant
+ .help = consider moving this anonymous constant into a `const` function
+ .maybe_supported = this operation may be supported in the future
+
+ty_utils_borrow_not_supported = borrowing is not supported in generic constants
+
+ty_utils_address_and_deref_not_supported = dereferencing or taking the address is not supported in generic constants
+
+ty_utils_array_not_supported = array construction is not supported in generic constants
+
+ty_utils_block_not_supported = blocks are not supported in generic constant
+
+ty_utils_never_to_any_not_supported = converting nevers to any is not supported in generic constant
+
+ty_utils_tuple_not_supported = tuple construction is not supported in generic constants
+
+ty_utils_index_not_supported = indexing is not supported in generic constant
+
+ty_utils_field_not_supported = field access is not supported in generic constant
+
+ty_utils_const_block_not_supported = const blocks are not supported in generic constant
+
+ty_utils_adt_not_supported = struct/enum construction is not supported in generic constants
+
+ty_utils_pointer_not_supported = pointer casts are not allowed in generic constants
+
+ty_utils_yield_not_supported = generator control flow is not allowed in generic constants
+
+ty_utils_loop_not_supported = loops and loop control flow are not supported in generic constants
+
+ty_utils_box_not_supported = allocations are not allowed in generic constants
+
+ty_utils_binary_not_supported = unsupported binary operation in generic constants
+
+ty_utils_logical_op_not_supported = unsupported operation in generic constants, short-circuiting operations would imply control flow
+
+ty_utils_assign_not_supported = assignment is not supported in generic constants
+
+ty_utils_closure_and_return_not_supported = closures and function keywords are not supported in generic constants
+
+ty_utils_control_flow_not_supported = control flow is not supported in generic constants
+
+ty_utils_inline_asm_not_supported = assembly is not supported in generic constants
+
+ty_utils_operation_not_supported = unsupported operation in generic constant
diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
index 2d001d445be02..28dca0ba00efd 100644
--- a/compiler/rustc_error_messages/src/lib.rs
+++ b/compiler/rustc_error_messages/src/lib.rs
@@ -44,6 +44,7 @@ fluent_messages! {
plugin_impl => "../locales/en-US/plugin_impl.ftl",
privacy => "../locales/en-US/privacy.ftl",
save_analysis => "../locales/en-US/save_analysis.ftl",
+ ty_utils => "../locales/en-US/ty_utils.ftl",
typeck => "../locales/en-US/typeck.ftl",
}
diff --git a/compiler/rustc_ty_utils/Cargo.toml b/compiler/rustc_ty_utils/Cargo.toml
index caad2ed4274f8..52fbd3ae04773 100644
--- a/compiler/rustc_ty_utils/Cargo.toml
+++ b/compiler/rustc_ty_utils/Cargo.toml
@@ -10,6 +10,7 @@ rustc_data_structures = { path = "../rustc_data_structures" }
rustc_errors = { path = "../rustc_errors" }
rustc_hir = { path = "../rustc_hir" }
rustc_infer = { path = "../rustc_infer" }
+rustc_macros = { path = "../rustc_macros" }
rustc_span = { path = "../rustc_span" }
rustc_session = { path = "../rustc_session" }
rustc_target = { path = "../rustc_target" }
diff --git a/compiler/rustc_ty_utils/src/consts.rs b/compiler/rustc_ty_utils/src/consts.rs
index e8ce8e6f23ec9..16c4d429129a9 100644
--- a/compiler/rustc_ty_utils/src/consts.rs
+++ b/compiler/rustc_ty_utils/src/consts.rs
@@ -11,6 +11,8 @@ use rustc_target::abi::VariantIdx;
use std::iter;
+use crate::errors::{GenericConstantTooComplex, GenericConstantTooComplexSub};
+
/// Destructures array, ADT or tuple constants into the constants
/// of their fields.
pub(crate) fn destructure_const<'tcx>(
@@ -93,26 +95,25 @@ impl<'a, 'tcx> AbstractConstBuilder<'a, 'tcx> {
self.body.exprs[self.body_id].span
}
- fn error(&mut self, span: Span, msg: &str) -> Result<!, ErrorGuaranteed> {
- let reported = self
- .tcx
- .sess
- .struct_span_err(self.root_span(), "overly complex generic constant")
- .span_label(span, msg)
- .help("consider moving this anonymous constant into a `const` function")
- .emit();
+ fn error(&mut self, sub: GenericConstantTooComplexSub) -> Result<!, ErrorGuaranteed> {
+ let reported = self.tcx.sess.emit_err(GenericConstantTooComplex {
+ span: self.root_span(),
+ maybe_supported: None,
+ sub,
+ });
Err(reported)
}
- fn maybe_supported_error(&mut self, span: Span, msg: &str) -> Result<!, ErrorGuaranteed> {
- let reported = self
- .tcx
- .sess
- .struct_span_err(self.root_span(), "overly complex generic constant")
- .span_label(span, msg)
- .help("consider moving this anonymous constant into a `const` function")
- .note("this operation may be supported in the future")
- .emit();
+
+ fn maybe_supported_error(
+ &mut self,
+ sub: GenericConstantTooComplexSub,
+ ) -> Result<!, ErrorGuaranteed> {
+ let reported = self.tcx.sess.emit_err(GenericConstantTooComplex {
+ span: self.root_span(),
+ maybe_supported: Some(()),
+ sub,
+ });
Err(reported)
}
@@ -243,22 +244,23 @@ impl<'a, 'tcx> AbstractConstBuilder<'a, 'tcx> {
&ExprKind::Scope { value, .. } => self.recurse_build(value)?,
&ExprKind::PlaceTypeAscription { source, .. }
| &ExprKind::ValueTypeAscription { source, .. } => self.recurse_build(source)?,
- &ExprKind::Literal { lit, neg} => {
+ &ExprKind::Literal { lit, neg } => {
let sp = node.span;
- let constant =
- match self.tcx.at(sp).lit_to_const(LitToConstInput { lit: &lit.node, ty: node.ty, neg }) {
- Ok(c) => c,
- Err(LitToConstError::Reported) => {
- self.tcx.const_error(node.ty)
- }
- Err(LitToConstError::TypeError) => {
- bug!("encountered type error in lit_to_const")
- }
- };
+ let constant = match self.tcx.at(sp).lit_to_const(LitToConstInput {
+ lit: &lit.node,
+ ty: node.ty,
+ neg,
+ }) {
+ Ok(c) => c,
+ Err(LitToConstError::Reported) => self.tcx.const_error(node.ty),
+ Err(LitToConstError::TypeError) => {
+ bug!("encountered type error in lit_to_const")
+ }
+ };
self.nodes.push(Node::Leaf(constant))
}
- &ExprKind::NonHirLiteral { lit , user_ty: _} => {
+ &ExprKind::NonHirLiteral { lit, user_ty: _ } => {
let val = ty::ValTree::from_scalar_int(lit);
self.nodes.push(Node::Leaf(ty::Const::from_value(self.tcx, val, node.ty)))
}
@@ -269,19 +271,17 @@ impl<'a, 'tcx> AbstractConstBuilder<'a, 'tcx> {
&ExprKind::NamedConst { def_id, substs, user_ty: _ } => {
let uneval = ty::Unevaluated::new(ty::WithOptConstParam::unknown(def_id), substs);
- let constant = self.tcx.mk_const(ty::ConstS {
- kind: ty::ConstKind::Unevaluated(uneval),
- ty: node.ty,
- });
+ let constant = self
+ .tcx
+ .mk_const(ty::ConstS { kind: ty::ConstKind::Unevaluated(uneval), ty: node.ty });
self.nodes.push(Node::Leaf(constant))
}
- ExprKind::ConstParam {param, ..} => {
- let const_param = self.tcx.mk_const(ty::ConstS {
- kind: ty::ConstKind::Param(*param),
- ty: node.ty,
- });
+ ExprKind::ConstParam { param, .. } => {
+ let const_param = self
+ .tcx
+ .mk_const(ty::ConstS { kind: ty::ConstKind::Param(*param), ty: node.ty });
self.nodes.push(Node::Leaf(const_param))
}
@@ -312,13 +312,13 @@ impl<'a, 'tcx> AbstractConstBuilder<'a, 'tcx> {
// }
// ```
ExprKind::Block { block } => {
- if let thir::Block { stmts: box [], expr: Some(e), .. } = &self.body.blocks[*block] {
+ if let thir::Block { stmts: box [], expr: Some(e), .. } = &self.body.blocks[*block]
+ {
self.recurse_build(*e)?
} else {
- self.maybe_supported_error(
+ self.maybe_supported_error(GenericConstantTooComplexSub::BlockNotSupported(
node.span,
- "blocks are not supported in generic constant",
- )?
+ ))?
}
}
// `ExprKind::Use` happens when a `hir::ExprKind::Cast` is a
@@ -332,7 +332,7 @@ impl<'a, 'tcx> AbstractConstBuilder<'a, 'tcx> {
let arg = self.recurse_build(source)?;
self.nodes.push(Node::Cast(CastKind::As, arg, node.ty))
}
- ExprKind::Borrow{ arg, ..} => {
+ ExprKind::Borrow { arg, .. } => {
let arg_node = &self.body.exprs[*arg];
// Skip reborrows for now until we allow Deref/Borrow/AddressOf
@@ -341,76 +341,69 @@ impl<'a, 'tcx> AbstractConstBuilder<'a, 'tcx> {
if let ExprKind::Deref { arg } = arg_node.kind {
self.recurse_build(arg)?
} else {
- self.maybe_supported_error(
+ self.maybe_supported_error(GenericConstantTooComplexSub::BorrowNotSupported(
node.span,
- "borrowing is not supported in generic constants",
- )?
+ ))?
}
}
// FIXME(generic_const_exprs): We may want to support these.
- ExprKind::AddressOf { .. } | ExprKind::Deref {..}=> self.maybe_supported_error(
- node.span,
- "dereferencing or taking the address is not supported in generic constants",
+ ExprKind::AddressOf { .. } | ExprKind::Deref { .. } => self.maybe_supported_error(
+ GenericConstantTooComplexSub::AddressAndDerefNotSupported(node.span),
)?,
- ExprKind::Repeat { .. } | ExprKind::Array { .. } => self.maybe_supported_error(
- node.span,
- "array construction is not supported in generic constants",
+ ExprKind::Repeat { .. } | ExprKind::Array { .. } => self.maybe_supported_error(
+ GenericConstantTooComplexSub::ArrayNotSupported(node.span),
)?,
ExprKind::NeverToAny { .. } => self.maybe_supported_error(
- node.span,
- "converting nevers to any is not supported in generic constant",
+ GenericConstantTooComplexSub::NeverToAnyNotSupported(node.span),
)?,
ExprKind::Tuple { .. } => self.maybe_supported_error(
- node.span,
- "tuple construction is not supported in generic constants",
+ GenericConstantTooComplexSub::TupleNotSupported(node.span),
)?,
ExprKind::Index { .. } => self.maybe_supported_error(
- node.span,
- "indexing is not supported in generic constant",
+ GenericConstantTooComplexSub::IndexNotSupported(node.span),
)?,
ExprKind::Field { .. } => self.maybe_supported_error(
- node.span,
- "field access is not supported in generic constant",
+ GenericConstantTooComplexSub::FieldNotSupported(node.span),
)?,
ExprKind::ConstBlock { .. } => self.maybe_supported_error(
- node.span,
- "const blocks are not supported in generic constant",
- )?,
- ExprKind::Adt(_) => self.maybe_supported_error(
- node.span,
- "struct/enum construction is not supported in generic constants",
+ GenericConstantTooComplexSub::ConstBlockNotSupported(node.span),
)?,
+ ExprKind::Adt(_) => self
+ .maybe_supported_error(GenericConstantTooComplexSub::AdtNotSupported(node.span))?,
// dont know if this is correct
- ExprKind::Pointer { .. } =>
- self.error(node.span, "pointer casts are not allowed in generic constants")?,
- ExprKind::Yield { .. } =>
- self.error(node.span, "generator control flow is not allowed in generic constants")?,
- ExprKind::Continue { .. } | ExprKind::Break { .. } | ExprKind::Loop { .. } => self
- .error(
- node.span,
- "loops and loop control flow are not supported in generic constants",
- )?,
- ExprKind::Box { .. } =>
- self.error(node.span, "allocations are not allowed in generic constants")?,
+ ExprKind::Pointer { .. } => {
+ self.error(GenericConstantTooComplexSub::PointerNotSupported(node.span))?
+ }
+ ExprKind::Yield { .. } => {
+ self.error(GenericConstantTooComplexSub::YieldNotSupported(node.span))?
+ }
+ ExprKind::Continue { .. } | ExprKind::Break { .. } | ExprKind::Loop { .. } => {
+ self.error(GenericConstantTooComplexSub::LoopNotSupported(node.span))?
+ }
+ ExprKind::Box { .. } => {
+ self.error(GenericConstantTooComplexSub::BoxNotSupported(node.span))?
+ }
ExprKind::Unary { .. } => unreachable!(),
// we handle valid unary/binary ops above
- ExprKind::Binary { .. } =>
- self.error(node.span, "unsupported binary operation in generic constants")?,
- ExprKind::LogicalOp { .. } =>
- self.error(node.span, "unsupported operation in generic constants, short-circuiting operations would imply control flow")?,
+ ExprKind::Binary { .. } => {
+ self.error(GenericConstantTooComplexSub::BinaryNotSupported(node.span))?
+ }
+ ExprKind::LogicalOp { .. } => {
+ self.error(GenericConstantTooComplexSub::LogicalOpNotSupported(node.span))?
+ }
ExprKind::Assign { .. } | ExprKind::AssignOp { .. } => {
- self.error(node.span, "assignment is not supported in generic constants")?
+ self.error(GenericConstantTooComplexSub::AssignNotSupported(node.span))?
+ }
+ ExprKind::Closure { .. } | ExprKind::Return { .. } => {
+ self.error(GenericConstantTooComplexSub::ClosureAndReturnNotSupported(node.span))?
}
- ExprKind::Closure { .. } | ExprKind::Return { .. } => self.error(
- node.span,
- "closures and function keywords are not supported in generic constants",
- )?,
// let expressions imply control flow
- ExprKind::Match { .. } | ExprKind::If { .. } | ExprKind::Let { .. } =>
- self.error(node.span, "control flow is not supported in generic constants")?,
+ ExprKind::Match { .. } | ExprKind::If { .. } | ExprKind::Let { .. } => {
+ self.error(GenericConstantTooComplexSub::ControlFlowNotSupported(node.span))?
+ }
ExprKind::InlineAsm { .. } => {
- self.error(node.span, "assembly is not supported in generic constants")?
+ self.error(GenericConstantTooComplexSub::InlineAsmNotSupported(node.span))?
}
// we dont permit let stmts so `VarRef` and `UpvarRef` cant happen
@@ -418,7 +411,7 @@ impl<'a, 'tcx> AbstractConstBuilder<'a, 'tcx> {
| ExprKind::UpvarRef { .. }
| ExprKind::StaticRef { .. }
| ExprKind::ThreadLocalRef(_) => {
- self.error(node.span, "unsupported operation in generic constant")?
+ self.error(GenericConstantTooComplexSub::OperationNotSupported(node.span))?
}
})
}
diff --git a/compiler/rustc_ty_utils/src/errors.rs b/compiler/rustc_ty_utils/src/errors.rs
new file mode 100644
index 0000000000000..3a8ef96c991f2
--- /dev/null
+++ b/compiler/rustc_ty_utils/src/errors.rs
@@ -0,0 +1,69 @@
+//! Errors emitted by ty_utils
+
+use rustc_macros::{SessionDiagnostic, SessionSubdiagnostic};
+use rustc_middle::ty::Ty;
+use rustc_span::Span;
+
+#[derive(SessionDiagnostic)]
+#[diag(ty_utils::needs_drop_overflow)]
+pub struct NeedsDropOverflow<'tcx> {
+ pub query_ty: Ty<'tcx>,
+}
+
+#[derive(SessionDiagnostic)]
+#[diag(ty_utils::generic_constant_too_complex)]
+#[help]
+pub struct GenericConstantTooComplex {
+ #[primary_span]
+ pub span: Span,
+ #[note(ty_utils::maybe_supported)]
+ pub maybe_supported: Option<()>,
+ #[subdiagnostic]
+ pub sub: GenericConstantTooComplexSub,
+}
+
+#[derive(SessionSubdiagnostic)]
+pub enum GenericConstantTooComplexSub {
+ #[label(ty_utils::borrow_not_supported)]
+ BorrowNotSupported(#[primary_span] Span),
+ #[label(ty_utils::address_and_deref_not_supported)]
+ AddressAndDerefNotSupported(#[primary_span] Span),
+ #[label(ty_utils::array_not_supported)]
+ ArrayNotSupported(#[primary_span] Span),
+ #[label(ty_utils::block_not_supported)]
+ BlockNotSupported(#[primary_span] Span),
+ #[label(ty_utils::never_to_any_not_supported)]
+ NeverToAnyNotSupported(#[primary_span] Span),
+ #[label(ty_utils::tuple_not_supported)]
+ TupleNotSupported(#[primary_span] Span),
+ #[label(ty_utils::index_not_supported)]
+ IndexNotSupported(#[primary_span] Span),
+ #[label(ty_utils::field_not_supported)]
+ FieldNotSupported(#[primary_span] Span),
+ #[label(ty_utils::const_block_not_supported)]
+ ConstBlockNotSupported(#[primary_span] Span),
+ #[label(ty_utils::adt_not_supported)]
+ AdtNotSupported(#[primary_span] Span),
+ #[label(ty_utils::pointer_not_supported)]
+ PointerNotSupported(#[primary_span] Span),
+ #[label(ty_utils::yield_not_supported)]
+ YieldNotSupported(#[primary_span] Span),
+ #[label(ty_utils::loop_not_supported)]
+ LoopNotSupported(#[primary_span] Span),
+ #[label(ty_utils::box_not_supported)]
+ BoxNotSupported(#[primary_span] Span),
+ #[label(ty_utils::binary_not_supported)]
+ BinaryNotSupported(#[primary_span] Span),
+ #[label(ty_utils::logical_op_not_supported)]
+ LogicalOpNotSupported(#[primary_span] Span),
+ #[label(ty_utils::assign_not_supported)]
+ AssignNotSupported(#[primary_span] Span),
+ #[label(ty_utils::closure_and_return_not_supported)]
+ ClosureAndReturnNotSupported(#[primary_span] Span),
+ #[label(ty_utils::control_flow_not_supported)]
+ ControlFlowNotSupported(#[primary_span] Span),
+ #[label(ty_utils::inline_asm_not_supported)]
+ InlineAsmNotSupported(#[primary_span] Span),
+ #[label(ty_utils::operation_not_supported)]
+ OperationNotSupported(#[primary_span] Span),
+}
diff --git a/compiler/rustc_ty_utils/src/lib.rs b/compiler/rustc_ty_utils/src/lib.rs
index 55d8269399403..6931b15b1ba57 100644
--- a/compiler/rustc_ty_utils/src/lib.rs
+++ b/compiler/rustc_ty_utils/src/lib.rs
@@ -10,6 +10,8 @@
#![feature(never_type)]
#![feature(box_patterns)]
#![recursion_limit = "256"]
+#![deny(rustc::untranslatable_diagnostic)]
+#![deny(rustc::diagnostic_outside_of_impl)]
#[macro_use]
extern crate rustc_middle;
@@ -21,6 +23,7 @@ use rustc_middle::ty::query::Providers;
mod assoc;
mod common_traits;
mod consts;
+mod errors;
mod implied_bounds;
pub mod instance;
mod needs_drop;
diff --git a/compiler/rustc_ty_utils/src/needs_drop.rs b/compiler/rustc_ty_utils/src/needs_drop.rs
index 9ad44d14d6180..ab5a3d8ae4892 100644
--- a/compiler/rustc_ty_utils/src/needs_drop.rs
+++ b/compiler/rustc_ty_utils/src/needs_drop.rs
@@ -9,6 +9,8 @@ use rustc_middle::ty::{self, EarlyBinder, Ty, TyCtxt};
use rustc_session::Limit;
use rustc_span::{sym, DUMMY_SP};
+use crate::errors::NeedsDropOverflow;
+
type NeedsDropResult<T> = Result<T, AlwaysRequiresDrop>;
fn needs_drop_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
@@ -90,10 +92,7 @@ where
if !self.recursion_limit.value_within_limit(level) {
// Not having a `Span` isn't great. But there's hopefully some other
// recursion limit error as well.
- tcx.sess.span_err(
- DUMMY_SP,
- &format!("overflow while checking whether `{}` requires drop", self.query_ty),
- );
+ tcx.sess.emit_err(NeedsDropOverflow { query_ty: self.query_ty });
return Some(Err(AlwaysRequiresDrop));
}