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use rustc_middle::mir::visit::PlaceContext;
use rustc_middle::mir::visit::Visitor;
use rustc_middle::mir::{Body, Local, Location};
pub trait FindAssignments {
// Finds all statements that assign directly to local (i.e., X = ...)
// and returns their locations.
fn find_assignments(&self, local: Local) -> Vec<Location>;
}
impl<'tcx> FindAssignments for Body<'tcx> {
fn find_assignments(&self, local: Local) -> Vec<Location> {
let mut visitor = FindLocalAssignmentVisitor { needle: local, locations: vec![] };
visitor.visit_body(self);
visitor.locations
}
}
// The Visitor walks the MIR to return the assignment statements corresponding
// to a Local.
struct FindLocalAssignmentVisitor {
needle: Local,
locations: Vec<Location>,
}
impl<'tcx> Visitor<'tcx> for FindLocalAssignmentVisitor {
fn visit_local(&mut self, local: Local, place_context: PlaceContext, location: Location) {
if self.needle != local {
return;
}
if place_context.is_place_assignment() {
self.locations.push(location);
}
}
}
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