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SILGen: Support mutable consuming parameters.

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Emit a box like we would for a local variable, and move the parameter value into the box, as
part of the prolog.
This commit is contained in:
Joe Groff
2023-01-25 12:40:29 -08:00
parent 704a4363d7
commit 2a187f2606
4 changed files with 45 additions and 14 deletions
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20
lib/SILGen/SILGenProlog.cpp
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@@ -429,18 +429,20 @@ struct ArgumentInitHelper {
ManagedValue argrv = makeArgument(ty, pd->isInOut(), isNoImplicitCopy,
lifetimeAnnotation, parent, loc);
SILValue value = argrv.getValue();
if (pd->isInOut()) {
assert(argrv.getType().isAddress() && "expected inout to be address");
} else {
#warning "todo"
assert(pd->isImmutableInFunctionBody()
&& "consuming mutable params not implemented yet");
// If the variable is immutable, we can bind the value as is.
// Leave the cleanup on the argument, if any, in place to consume the
// argument if we're responsible for it.
} else if (!pd->isImmutableInFunctionBody()) {
// If it's a locally mutable parameter, then we need to move the argument
// value into a local box to hold the mutated value.
auto mutableBox = SGF.emitLocalVariableWithCleanup(pd,
MarkUninitializedInst::Var);
argrv.ensurePlusOne(SGF, loc).forwardInto(SGF, loc, mutableBox.get());
return;
}
SILValue value = argrv.getValue();
#warning "todo"
// If the variable is immutable, we can bind the value as is.
// Leave the cleanup on the argument, if any, in place to consume the
// argument if we're responsible for it.
SILDebugVariable varinfo(pd->isImmutableInFunctionBody(), ArgNo);
if (!argrv.getType().isAddress()) {
// NOTE: We setup SGF.VarLocs[pd] in updateArgumentValueForBinding.