Struct rustc::mir::Mir

pub struct Mir<'tcx> {
    pub visibility_scopes: IndexVec<VisibilityScope, VisibilityScopeData>,
    pub visibility_scope_info: ClearCrossCrate<IndexVec<VisibilityScope, VisibilityScopeInfo>>,
    pub promoted: IndexVec<Promoted, Mir<'tcx>>,
    pub yield_ty: Option<Ty<'tcx>>,
    pub generator_drop: Option<Box<Mir<'tcx>>>,
    pub generator_layout: Option<GeneratorLayout<'tcx>>,
    pub local_decls: IndexVec<Local, LocalDecl<'tcx>>,
    pub arg_count: usize,
    pub upvar_decls: Vec<UpvarDecl>,
    pub spread_arg: Option<Local>,
    pub span: Span,
    // some fields omitted
}

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Lowered representation of a single function.

Fields

visibility_scopes: IndexVec<VisibilityScope, VisibilityScopeData>

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List of visibility (lexical) scopes; these are referenced by statements and used (eventually) for debuginfo. Indexed by a VisibilityScope.

visibility_scope_info: ClearCrossCrate<IndexVec<VisibilityScope, VisibilityScopeInfo>>

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Crate-local information for each visibility scope, that can't (and needn't) be tracked across crates.

promoted: IndexVec<Promoted, Mir<'tcx>>

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Rvalues promoted from this function, such as borrows of constants. Each of them is the Mir of a constant with the fn's type parameters in scope, but a separate set of locals.

yield_ty: Option<Ty<'tcx>>

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Yield type of the function, if it is a generator.

generator_drop: Option<Box<Mir<'tcx>>>

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Generator drop glue

generator_layout: Option<GeneratorLayout<'tcx>>

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The layout of a generator. Produced by the state transformation.

local_decls: IndexVec<Local, LocalDecl<'tcx>>

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Declarations of locals.

The first local is the return value pointer, followed by arg_count locals for the function arguments, followed by any user-declared variables and temporaries.

arg_count: usize

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Number of arguments this function takes.

Starting at local 1, arg_count locals will be provided by the caller and can be assumed to be initialized.

If this MIR was built for a constant, this will be 0.

upvar_decls: Vec<UpvarDecl>

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Names and capture modes of all the closure upvars, assuming the first argument is either the closure or a reference to it.

spread_arg: Option<Local>

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Mark an argument local (which must be a tuple) as getting passed as its individual components at the LLVM level.

This is used for the "rust-call" ABI.

span: Span

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A span representing this MIR, for error reporting

Methods

impl<'tcx> Mir<'tcx>

pub fn new(
    basic_blocks: IndexVec<BasicBlock, BasicBlockData<'tcx>>,
    visibility_scopes: IndexVec<VisibilityScope, VisibilityScopeData>,
    visibility_scope_info: ClearCrossCrate<IndexVec<VisibilityScope, VisibilityScopeInfo>>,
    promoted: IndexVec<Promoted, Mir<'tcx>>,
    yield_ty: Option<Ty<'tcx>>,
    local_decls: IndexVec<Local, LocalDecl<'tcx>>,
    arg_count: usize,
    upvar_decls: Vec<UpvarDecl>,
    span: Span
) -> Self

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pub fn basic_blocks(&self) -> &IndexVec<BasicBlock, BasicBlockData<'tcx>>

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pub fn basic_blocks_mut(
    &mut self
) -> &mut IndexVec<BasicBlock, BasicBlockData<'tcx>>

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pub fn basic_blocks_and_local_decls_mut(
    &mut self
) -> (&mut IndexVec<BasicBlock, BasicBlockData<'tcx>>, &mut IndexVec<Local, LocalDecl<'tcx>>)

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pub fn predecessors(&self) -> Ref<IndexVec<BasicBlock, Vec<BasicBlock>>>

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pub fn predecessors_for(&self, bb: BasicBlock) -> Ref<Vec<BasicBlock>>

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pub fn dominators(&self) -> Dominators<BasicBlock>

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pub fn local_kind(&self, local: Local) -> LocalKind

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pub fn temps_iter<'a>(&'a self) -> impl Iterator<Item = Local> + 'a

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Returns an iterator over all temporaries.

pub fn vars_iter<'a>(&'a self) -> impl Iterator<Item = Local> + 'a

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Returns an iterator over all user-declared locals.

pub fn args_iter(&self) -> impl Iterator<Item = Local>

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Returns an iterator over all function arguments.

pub fn vars_and_temps_iter(&self) -> impl Iterator<Item = Local>

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Returns an iterator over all user-defined variables and compiler-generated temporaries (all locals that are neither arguments nor the return place).

pub fn make_statement_nop(&mut self, location: Location)

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Changes a statement to a nop. This is both faster than deleting instructions and avoids invalidating statement indices in Locations.

pub fn source_info(&self, location: Location) -> &SourceInfo

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Returns the source info associated with location.

pub fn return_ty(&self) -> Ty<'tcx>

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Return the return type, it always return first element from local_decls array

Trait Implementations

impl<'tcx> HasLocalDecls<'tcx> for Mir<'tcx>

fn local_decls(&self) -> &IndexVec<Local, LocalDecl<'tcx>>

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impl<'tcx> Clone for Mir<'tcx>

fn clone(&self) -> Mir<'tcx>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx> Encodable for Mir<'tcx>

fn encode<__S: Encoder>(&self, __arg_0: &mut __S) -> Result<(), __S::Error>

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impl<'tcx> Decodable for Mir<'tcx>

fn decode<__D: Decoder>(__arg_0: &mut __D) -> Result<Mir<'tcx>, __D::Error>

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impl<'tcx> Debug for Mir<'tcx>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<'tcx> HashStable<StableHashingContext<'tcx>> for Mir<'tcx>

fn hash_stable<W: StableHasherResult>(
    &self,
    __ctx: &mut StableHashingContext<'tcx>,
    __hasher: &mut StableHasher<W>
)

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impl<'tcx> Index<BasicBlock> for Mir<'tcx>

type Output = BasicBlockData<'tcx>

The returned type after indexing.

fn index(&self, index: BasicBlock) -> &BasicBlockData<'tcx>

Performs the indexing (container[index]) operation.

impl<'tcx> IndexMut<BasicBlock> for Mir<'tcx>

fn index_mut(&mut self, index: BasicBlock) -> &mut BasicBlockData<'tcx>

Performs the mutable indexing (container[index]) operation.

impl<'tcx> ControlFlowGraph for Mir<'tcx>

type Node = BasicBlock

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fn num_nodes(&self) -> usize

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fn start_node(&self) -> Self::Node

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fn predecessors<'graph>(&'graph self, node: Self::Node) -> Self::Iter

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fn successors<'graph>(&'graph self, node: Self::Node) -> Self::Iter

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impl<'a, 'b> GraphPredecessors<'b> for Mir<'a>

type Item = BasicBlock

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type Iter = IntoIter<BasicBlock>

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impl<'a, 'b> GraphSuccessors<'b> for Mir<'a>

type Item = BasicBlock

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type Iter = IntoIter<BasicBlock>

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impl<'tcx> TypeFoldable<'tcx> for Mir<'tcx>

fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
    &self,
    folder: &mut F
) -> Self

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fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

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fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
    &self,
    folder: &mut F
) -> Self

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fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

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fn has_regions_escaping_depth(&self, depth: u32) -> bool

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fn has_escaping_regions(&self) -> bool

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fn has_type_flags(&self, flags: TypeFlags) -> bool

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fn has_projections(&self) -> bool

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fn references_error(&self) -> bool

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fn has_param_types(&self) -> bool

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fn has_self_ty(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn needs_infer(&self) -> bool

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fn needs_subst(&self) -> bool

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fn has_re_skol(&self) -> bool

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fn has_closure_types(&self) -> bool

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fn has_erasable_regions(&self) -> bool

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fn is_normalized_for_trans(&self) -> bool

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fn is_global(&self) -> bool

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Indicates whether this value references only 'global' types/lifetimes that are the same regardless of what fn we are in. This is used for caching. Errs on the side of returning false.