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Rollup merge of #100887 - eholk:codegen_call_terminator-cleanup, r=fee1-dead 

Refactor part of codegen_call_terminator

I was reading through this code and found the chain of `if let` and a nested match on the same value that was matched in the `if let` to be kind of hard to follow. This PR cleans it up by flattening the `if let` chain and nested match into a single `match` expression.
This commit is contained in:
Matthias Krüger 2022-08-23 06:55:30 +02:00 committed by GitHub
parent 8332f6559b b562f95963
commit 234e0f27c2
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 44 additions and 47 deletions
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13
compiler/rustc_codegen_ssa/src/mir/block.rs
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@ -798,7 +798,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
let mut op = self.codegen_operand(&mut bx, arg);
if let (0, Some(ty::InstanceDef::Virtual(_, idx))) = (i, def) {
if let Pair(..) = op.val {
match op.val {
Pair(data_ptr, meta) => {
// In the case of Rc<Self>, we need to explicitly pass a
// *mut RcBox<Self> with a Scalar (not ScalarPair) ABI. This is a hack
// that is understood elsewhere in the compiler as a method on
@ -825,8 +826,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
// now that we have `*dyn Trait` or `&dyn Trait`, split it up into its
// data pointer and vtable. Look up the method in the vtable, and pass
// the data pointer as the first argument
match op.val {
Pair(data_ptr, meta) => {
llfn = Some(meth::VirtualIndex::from_index(idx).get_fn(
&mut bx,
meta,
@ -836,9 +835,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
llargs.push(data_ptr);
continue 'make_args;
}
other => bug!("expected a Pair, got {:?}", other),
}
} else if let Ref(data_ptr, Some(meta), _) = op.val {
Ref(data_ptr, Some(meta), _) => {
// by-value dynamic dispatch
llfn = Some(meth::VirtualIndex::from_index(idx).get_fn(
&mut bx,
@ -848,8 +845,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
));
llargs.push(data_ptr);
continue;
} else {
span_bug!(span, "can't codegen a virtual call on {:?}", op);
}
_ => span_bug!(span, "can't codegen a virtual call on {:?}", op),
}
}