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Outliner: Add comment explaining that getBridgeTo/FromObjectiveC returns an invalid SILDeclRef to signal that the type does not conform to the bridgeable protocol

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This commit is contained in:
Arnold Schwaighofer
2019-12-11 10:35:06 -08:00
parent a6168a93bb
commit c4256e7992
1 changed files with 4 additions and 0 deletions
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4
lib/SILOptimizer/Transforms/Outliner.cpp
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@@ -491,6 +491,8 @@ static bool matchSwitch(SwitchInfo &SI, SILInstruction *Inst,
auto NativeType = Apply->getType().getASTType();
auto *BridgeFun = FunRef->getInitiallyReferencedFunction();
auto *SwiftModule = BridgeFun->getModule().getSwiftModule();
// Not every type conforms to the ObjectiveCBridgeable protocol in such a case
// getBridgeFromObjectiveC returns SILDeclRef().
auto bridgeWitness = getBridgeFromObjectiveC(NativeType, SwiftModule);
if (bridgeWitness == SILDeclRef() ||
BridgeFun->getName() != bridgeWitness.mangle())
@@ -809,6 +811,8 @@ BridgedArgument BridgedArgument::match(unsigned ArgIdx, SILValue Arg,
auto NativeType = BridgedValue->getType().getASTType();
auto *BridgeFun = FunRef->getInitiallyReferencedFunction();
auto *SwiftModule = BridgeFun->getModule().getSwiftModule();
// Not every type conforms to the ObjectiveCBridgeable protocol in such a case
// getBridgeToObjectiveC returns SILDeclRef().
auto bridgeWitness = getBridgeToObjectiveC(NativeType, SwiftModule);
if (bridgeWitness == SILDeclRef() ||
BridgeFun->getName() != bridgeWitness.mangle())