Struct VnState 

struct VnState<'body, 'a, 'tcx> {
    tcx: TyCtxt<'tcx>,
    ecx: InterpCx<'tcx, DummyMachine>,
    local_decls: &'body LocalDecls<'tcx>,
    is_coroutine: bool,
    locals: IndexVec<Local, Option<VnIndex>>,
    rev_locals: IndexVec<VnIndex, SmallVec<[Local; 1]>>,
    values: ValueSet<'a, 'tcx>,
    evaluated: IndexVec<VnIndex, Option<Option<&'a OpTy<'tcx>>>>,
    ssa: &'body SsaLocals,
    dominators: Dominators<BasicBlock>,
    reused_locals: DenseBitSet<Local>,
    arena: &'a DroplessArena,
}

Fields

tcx: TyCtxt<'tcx>

ecx: InterpCx<'tcx, DummyMachine>

local_decls: &'body LocalDecls<'tcx>

is_coroutine: bool

locals: IndexVec<Local, Option<VnIndex>>

Value stored in each local.

rev_locals: IndexVec<VnIndex, SmallVec<[Local; 1]>>

Locals that are assigned that value.

values: ValueSet<'a, 'tcx>

evaluated: IndexVec<VnIndex, Option<Option<&'a OpTy<'tcx>>>>

Values evaluated as constants if possible.

• None are values not computed yet;
• Some(None) are values for which computation has failed;
• Some(Some(op)) are successful computations.

ssa: &'body SsaLocals

dominators: Dominators<BasicBlock>

reused_locals: DenseBitSet<Local>

arena: &'a DroplessArena

Implementations

impl<'body, 'a, 'tcx> VnState<'body, 'a, 'tcx>

fn new( tcx: TyCtxt<'tcx>, body: &Body<'tcx>, typing_env: TypingEnv<'tcx>, ssa: &'body SsaLocals, dominators: Dominators<BasicBlock>, local_decls: &'body LocalDecls<'tcx>, arena: &'a DroplessArena, ) -> Self

fn typing_env(&self) -> TypingEnv<'tcx>

fn insert_unique( &mut self, ty: Ty<'tcx>, value: impl FnOnce(VnOpaque) -> Value<'a, 'tcx>, ) -> VnIndex

fn insert(&mut self, ty: Ty<'tcx>, value: Value<'a, 'tcx>) -> VnIndex

fn new_opaque(&mut self, ty: Ty<'tcx>) -> VnIndex

Create a new Value for which we have no information at all, except that it is distinct from all the others.

fn new_argument(&mut self, ty: Ty<'tcx>) -> VnIndex

fn new_pointer( &mut self, place: Place<'tcx>, kind: AddressKind, ) -> Option<VnIndex>

Create a new Value::Address distinct from all the others.

fn insert_constant(&mut self, value: Const<'tcx>) -> VnIndex

fn get(&self, index: VnIndex) -> Value<'a, 'tcx>

fn ty(&self, index: VnIndex) -> Ty<'tcx>

fn assign(&mut self, local: Local, value: VnIndex)

Record that local is assigned value. local must be SSA.

fn insert_bool(&mut self, flag: bool) -> VnIndex

fn insert_scalar(&mut self, ty: Ty<'tcx>, scalar: Scalar) -> VnIndex

fn insert_tuple(&mut self, ty: Ty<'tcx>, values: &[VnIndex]) -> VnIndex

fn eval_to_const_inner(&mut self, value: VnIndex) -> Option<OpTy<'tcx>>

fn eval_to_const(&mut self, index: VnIndex) -> Option<&'a OpTy<'tcx>>

fn dereference_address( &mut self, base: AddressBase, projection: &[ProjectionElem<VnIndex, Ty<'tcx>>], ) -> Option<VnIndex>

Represent the value we obtain by dereferencing an Address value.

fn project( &mut self, place_ty: PlaceTy<'tcx>, value: VnIndex, proj: ProjectionElem<VnIndex, Ty<'tcx>>, ) -> Option<(PlaceTy<'tcx>, VnIndex)>

fn simplify_place_projection( &mut self, place: &mut Place<'tcx>, location: Location, )

Simplify the projection chain if we know better.

fn compute_place_value( &mut self, place: Place<'tcx>, location: Location, ) -> Result<VnIndex, PlaceRef<'tcx>>

Represent the value which would be read from place. If we succeed, return it. If we fail, return a PlaceRef that contains the same value.

fn simplify_place_value( &mut self, place: &mut Place<'tcx>, location: Location, ) -> Option<VnIndex>

Represent the value which would be read from place, and point place to a preexisting place with the same value (if that already exists).

fn simplify_operand( &mut self, operand: &mut Operand<'tcx>, location: Location, ) -> Option<VnIndex>

fn simplify_rvalue( &mut self, lhs: &Place<'tcx>, rvalue: &mut Rvalue<'tcx>, location: Location, ) -> Option<VnIndex>

fn simplify_discriminant(&mut self, place: VnIndex) -> Option<VnIndex>

fn try_as_place_elem( &mut self, ty: Ty<'tcx>, proj: ProjectionElem<VnIndex, ()>, loc: Location, ) -> Option<PlaceElem<'tcx>>

fn simplify_aggregate_to_copy( &mut self, ty: Ty<'tcx>, variant_index: VariantIdx, fields: &[VnIndex], ) -> Option<VnIndex>

fn simplify_aggregate( &mut self, rvalue: &mut Rvalue<'tcx>, location: Location, ) -> Option<VnIndex>

fn simplify_unary( &mut self, op: UnOp, arg_op: &mut Operand<'tcx>, location: Location, ) -> Option<VnIndex>

fn simplify_binary( &mut self, op: BinOp, lhs_operand: &mut Operand<'tcx>, rhs_operand: &mut Operand<'tcx>, location: Location, ) -> Option<VnIndex>

fn simplify_binary_inner( &mut self, op: BinOp, lhs_ty: Ty<'tcx>, lhs: VnIndex, rhs: VnIndex, ) -> Option<VnIndex>

fn simplify_cast( &mut self, initial_kind: &mut CastKind, initial_operand: &mut Operand<'tcx>, to: Ty<'tcx>, location: Location, ) -> Option<VnIndex>

fn pointers_have_same_metadata( &self, left_ptr_ty: Ty<'tcx>, right_ptr_ty: Ty<'tcx>, ) -> bool

fn transmute_may_have_niche_of_interest_to_backend( &self, from_ty: Ty<'tcx>, middle_ty: Ty<'tcx>, to_ty: Ty<'tcx>, ) -> bool

Returns false if we’re confident that the middle type doesn’t have an interesting niche so we can skip that step when transmuting.

The backend will emit assumes when transmuting between types with niches, so we want to preserve i32 -> char -> u32 so that that data is around, but it’s fine to skip whole-range-is-value steps like A -> u32 -> B.

fn value_is_all_in_one_field( &self, ty: Ty<'tcx>, variant: VariantIdx, ) -> Option<(FieldIdx, Ty<'tcx>)>

impl<'tcx> VnState<'_, '_, 'tcx>

fn try_as_operand( &mut self, index: VnIndex, location: Location, ) -> Option<Operand<'tcx>>

If either Self::try_as_constant as Self::try_as_place succeeds, returns that result as an Operand.

fn try_as_constant(&mut self, index: VnIndex) -> Option<ConstOperand<'tcx>>

If index is a Value::Constant, return the Constant to be put in the MIR.

fn try_as_place( &mut self, index: VnIndex, loc: Location, allow_complex_projection: bool, ) -> Option<Place<'tcx>>

Construct a place which holds the same value as index and for which all locals strictly dominate loc. If you used this place, add its base local to reused_locals to remove storage statements.

fn try_as_local(&mut self, index: VnIndex, loc: Location) -> Option<Local>

If there is a local which is assigned index, and its assignment strictly dominates loc, return it. If you used this local, add it to reused_locals to remove storage statements.

Trait Implementations

impl<'tcx> MutVisitor<'tcx> for VnState<'_, '_, 'tcx>

fn tcx(&self) -> TyCtxt<'tcx>

fn visit_place( &mut self, place: &mut Place<'tcx>, context: PlaceContext, location: Location, )

fn visit_operand(&mut self, operand: &mut Operand<'tcx>, location: Location)

fn visit_assign( &mut self, lhs: &mut Place<'tcx>, rvalue: &mut Rvalue<'tcx>, location: Location, )

fn visit_terminator( &mut self, terminator: &mut Terminator<'tcx>, location: Location, )

fn visit_body(&mut self, body: &mut Body<'tcx>)

fn visit_body_preserves_cfg(&mut self, body: &mut Body<'tcx>)

fn super_body_preserves_cfg(&mut self, body: &mut Body<'tcx>)

fn visit_basic_block_data( &mut self, block: BasicBlock, data: &mut BasicBlockData<'tcx>, )

fn visit_source_scope_data(&mut self, scope_data: &mut SourceScopeData<'tcx>)

fn visit_statement_debuginfo( &mut self, stmt_debuginfo: &mut StmtDebugInfo<'tcx>, location: Location, )

fn visit_statement( &mut self, statement: &mut Statement<'tcx>, location: Location, )

fn visit_assert_message( &mut self, msg: &mut AssertKind<Operand<'tcx>>, location: Location, )

fn visit_rvalue(&mut self, rvalue: &mut Rvalue<'tcx>, location: Location)

fn visit_ascribe_user_ty( &mut self, place: &mut Place<'tcx>, variance: &mut Variance, user_ty: &mut UserTypeProjection, location: Location, )

fn visit_coverage(&mut self, kind: &mut CoverageKind, location: Location)

fn visit_retag( &mut self, kind: &mut RetagKind, place: &mut Place<'tcx>, location: Location, )

fn super_place( &mut self, place: &mut Place<'tcx>, context: PlaceContext, location: Location, )

fn process_projection<'a>( &mut self, projection: &'a [ProjectionElem<Local, Ty<'tcx>>], location: Location, ) -> Option<Vec<ProjectionElem<Local, Ty<'tcx>>>>

fn process_projection_elem( &mut self, elem: ProjectionElem<Local, Ty<'tcx>>, location: Location, ) -> Option<ProjectionElem<Local, Ty<'tcx>>>

fn visit_const_operand( &mut self, constant: &mut ConstOperand<'tcx>, location: Location, )

This is called for every constant in the MIR body and every required_consts (i.e., including consts that have been dead-code-eliminated).

fn visit_ty_const(&mut self, ct: &mut Const<'tcx>, location: Location)

fn visit_span(&mut self, span: &mut Span)

fn visit_source_info(&mut self, source_info: &mut SourceInfo)

fn visit_ty(&mut self, ty: &mut Ty<'tcx>, _: TyContext)

fn visit_user_type_projection(&mut self, ty: &mut UserTypeProjection)

fn visit_user_type_annotation( &mut self, index: UserTypeAnnotationIndex, ty: &mut CanonicalUserTypeAnnotation<'tcx>, )

fn visit_region(&mut self, region: &mut Region<'tcx>, _: Location)

fn visit_args( &mut self, args: &mut &'tcx RawList<(), GenericArg<'tcx>>, _: Location, )

fn visit_local_decl(&mut self, local: Local, local_decl: &mut LocalDecl<'tcx>)

fn visit_var_debug_info(&mut self, var_debug_info: &mut VarDebugInfo<'tcx>)

fn visit_local( &mut self, local: &mut Local, context: PlaceContext, location: Location, )

fn visit_source_scope(&mut self, scope: &mut SourceScope)

fn super_body(&mut self, body: &mut Body<'tcx>)

fn super_basic_block_data( &mut self, block: BasicBlock, data: &mut BasicBlockData<'tcx>, )

fn super_source_scope_data(&mut self, scope_data: &mut SourceScopeData<'tcx>)

fn super_statement_debuginfo( &mut self, stmt_debuginfo: &mut StmtDebugInfo<'tcx>, location: Location, )

fn super_statement( &mut self, statement: &mut Statement<'tcx>, location: Location, )

fn super_assign( &mut self, place: &mut Place<'tcx>, rvalue: &mut Rvalue<'tcx>, location: Location, )

fn super_terminator( &mut self, terminator: &mut Terminator<'tcx>, location: Location, )

fn super_assert_message( &mut self, msg: &mut AssertKind<Operand<'tcx>>, location: Location, )

fn super_rvalue(&mut self, rvalue: &mut Rvalue<'tcx>, location: Location)

fn super_operand(&mut self, operand: &mut Operand<'tcx>, location: Location)

fn super_ascribe_user_ty( &mut self, place: &mut Place<'tcx>, variance: &mut Variance, user_ty: &mut UserTypeProjection, location: Location, )

fn super_coverage(&mut self, _kind: &mut CoverageKind, _location: Location)

fn super_retag( &mut self, _kind: &mut RetagKind, place: &mut Place<'tcx>, location: Location, )

fn super_local_decl(&mut self, local: Local, local_decl: &mut LocalDecl<'tcx>)

fn super_local( &mut self, _local: &mut Local, _context: PlaceContext, _location: Location, )

fn super_var_debug_info(&mut self, var_debug_info: &mut VarDebugInfo<'tcx>)

fn super_source_scope(&mut self, _scope: &mut SourceScope)

fn super_const_operand( &mut self, constant: &mut ConstOperand<'tcx>, location: Location, )

fn super_ty_const(&mut self, _ct: &mut Const<'tcx>, _location: Location)

fn super_span(&mut self, _span: &mut Span)

fn super_source_info(&mut self, source_info: &mut SourceInfo)

fn super_user_type_projection(&mut self, _ty: &mut UserTypeProjection)

fn super_user_type_annotation( &mut self, _index: UserTypeAnnotationIndex, ty: &mut CanonicalUserTypeAnnotation<'tcx>, )

fn super_ty(&mut self, _ty: &mut Ty<'tcx>)

fn super_region(&mut self, _region: &mut Region<'tcx>)

fn super_args(&mut self, _args: &mut &'tcx RawList<(), GenericArg<'tcx>>)

fn visit_location(&mut self, body: &mut Body<'tcx>, location: Location)

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 528 bytes