37 lines
1.4 KiB
Rust
37 lines
1.4 KiB
Rust
use rustc_middle::mir::*;
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use rustc_middle::ty::subst::SubstsRef;
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use rustc_middle::ty::{self, TyCtxt};
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use rustc_span::def_id::DefId;
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/// Checks if the specified `local` is used as the `self` prameter of a method call
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/// in the provided `BasicBlock`. If it is, then the `DefId` of the called method is
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/// returned.
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pub fn find_self_call<'tcx>(
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tcx: TyCtxt<'tcx>,
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body: &Body<'tcx>,
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local: Local,
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block: BasicBlock,
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) -> Option<(DefId, SubstsRef<'tcx>)> {
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debug!("find_self_call(local={:?}): terminator={:?}", local, &body[block].terminator);
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if let Some(Terminator { kind: TerminatorKind::Call { func, args, .. }, .. }) =
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&body[block].terminator
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{
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debug!("find_self_call: func={:?}", func);
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if let Operand::Constant(box Constant { literal, .. }) = func {
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if let ty::FnDef(def_id, substs) = *literal.ty().kind() {
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if let Some(ty::AssocItem { fn_has_self_parameter: true, .. }) =
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tcx.opt_associated_item(def_id)
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{
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debug!("find_self_call: args={:?}", args);
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if let [Operand::Move(self_place) | Operand::Copy(self_place), ..] = **args {
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if self_place.as_local() == Some(local) {
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return Some((def_id, substs));
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}
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}
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}
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}
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}
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}
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None
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}
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