Struct rustc_middle::mir::Body

source ·
pub struct Body<'tcx> {
Show 16 fields pub basic_blocks: BasicBlocks<'tcx>, pub phase: MirPhase, pub pass_count: usize, pub source: MirSource<'tcx>, pub source_scopes: IndexVec<SourceScope, SourceScopeData<'tcx>>, pub generator: Option<Box<GeneratorInfo<'tcx>>>, pub local_decls: LocalDecls<'tcx>, pub user_type_annotations: CanonicalUserTypeAnnotations<'tcx>, pub arg_count: usize, pub spread_arg: Option<Local>, pub var_debug_info: Vec<VarDebugInfo<'tcx>>, pub span: Span, pub required_consts: Vec<Constant<'tcx>>, pub is_polymorphic: bool, pub injection_phase: Option<MirPhase>, pub tainted_by_errors: Option<ErrorGuaranteed>,
Expand description

The lowered representation of a single function.


§basic_blocks: BasicBlocks<'tcx>

A list of basic blocks. References to basic block use a newtyped index type BasicBlock that indexes into this vector.

§phase: MirPhase

Records how far through the “desugaring and optimization” process this particular MIR has traversed. This is particularly useful when inlining, since in that context we instantiate the promoted constants and add them to our promoted vector – but those promoted items have already been optimized, whereas ours have not. This field allows us to see the difference and forego optimization on the inlined promoted items.

§pass_count: usize

How many passses we have executed since starting the current phase. Used for debug output.

§source: MirSource<'tcx>§source_scopes: IndexVec<SourceScope, SourceScopeData<'tcx>>

A list of source scopes; these are referenced by statements and used for debuginfo. Indexed by a SourceScope.

§generator: Option<Box<GeneratorInfo<'tcx>>>§local_decls: LocalDecls<'tcx>

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.

§user_type_annotations: CanonicalUserTypeAnnotations<'tcx>

User type annotations.

§arg_count: usize

The 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.

§spread_arg: Option<Local>

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.

§var_debug_info: Vec<VarDebugInfo<'tcx>>

Debug information pertaining to user variables, including captures.

§span: Span

A span representing this MIR, for error reporting.

§required_consts: Vec<Constant<'tcx>>

Constants that are required to evaluate successfully for this MIR to be well-formed. We hold in this field all the constants we are not able to evaluate yet.

§is_polymorphic: bool

Does this body use generic parameters. This is used for the ConstEvaluatable check.

Note that this does not actually mean that this body is not computable right now. The repeat count in the following example is polymorphic, but can still be evaluated without knowing anything about the type parameter T.

fn test<T>() {
    let _ = [0; std::mem::size_of::<*mut T>()];

WARNING: Do not change this flags after the MIR was originally created, even if an optimization removed the last mention of all generic params. We do not want to rely on optimizations and potentially allow things like [u8; std::mem::size_of::<T>() * 0] due to this.

§injection_phase: Option<MirPhase>

The phase at which this MIR should be “injected” into the compilation process.

Everything that comes before this MirPhase should be skipped.

This is only Some if the function that this body comes from was annotated with rustc_custom_mir.

§tainted_by_errors: Option<ErrorGuaranteed>


Returns a partially initialized MIR body containing only a list of basic blocks.

The returned MIR contains no LocalDecls (even for the return place) or source scopes. It is only useful for testing but cannot be #[cfg(test)] because it is used in a different crate.

Returns an iterator over all user-declared mutable locals.

Returns an iterator over all user-declared mutable arguments and locals.

Returns an iterator over all function arguments.

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

Returns the source info associated with location.

Returns the return type; it always return first element from local_decls array.

Returns the return type; it always return first element from local_decls array.

Gets the location of the terminator for the given block.

Trait Implementations§

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
The returned type after indexing.
Performs the indexing (container[index]) operation. Read more
Performs the mutable indexing (container[index]) operation. Read more
The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f). Read more
A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.
The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v). Read more
Returns true if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free.
Returns true if this type has any regions that escape binder (and hence are not bound by it).
Return true if this type has regions that are not a part of the type. For example, for<'a> fn(&'a i32) return false, while fn(&'a i32) would return true. The latter can occur when traversing through the former. Read more
“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound.
True if there are any un-erased free regions.
Indicates whether this value references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching.
True if there are any late-bound regions
True if there are any late-bound non-region variables
True if there are any late-bound variables
Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous).
This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes during red-green evaluation. The query system will only call this method if fingerprint_style() is not FingerprintStyle::Opaque. It is always valid to return None here, in which case incremental compilation will treat the query as having changed instead of forcing it.

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.


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: 312 bytes