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Improve casts analysis for bridged types.

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Check if the outcome of a cast from an ObjC type to a Swift type or from a Swift type to an ObjC type can be statically determined.
This allows for folding of many such casts.

Swift SVN r26125
This commit is contained in:
Roman Levenstein
2015-03-14 02:23:07 +00:00
parent 8ffdfd59c8
commit eddfc3c57a
2 changed files with 89 additions and 5 deletions
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34
lib/SIL/DynamicCasts.cpp
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@@ -242,6 +242,11 @@ swift::classifyDynamicCast(Module *M,
source = sourceMetatype.getInstanceType();
target = targetMetatype.getInstanceType();
if (source == target &&
targetMetatype.isAnyExistentialType() ==
sourceMetatype.isAnyExistentialType())
return DynamicCastFeasibility::WillSucceed;
if (targetMetatype.isAnyExistentialType() && isa<ProtocolType>(target)) {
auto Feasibility = classifyDynamicCastToProtocol(source,
target,
@@ -320,13 +325,34 @@ swift::classifyDynamicCast(Module *M,
// FIXME: tuple conversions?
// Check if there might be a bridging conversion.
if (source->isBridgeableObjectType()
&& mayBridgeToObjectiveC(M, target)) {
if (source->isBridgeableObjectType() && mayBridgeToObjectiveC(M, target)) {
// Try to get the ObjC type which is bridged to target type.
assert(!target.isAnyExistentialType());
Optional<Type> ObjCTy = M->getASTContext().getBridgedToObjC(
M, /*inExpression*/ false, target, nullptr);
if (ObjCTy) {
// If the bridged ObjC type is known, check if
// source type can be casted into it.
return classifyDynamicCast(M, source,
ObjCTy.getValue().getCanonicalTypeOrNull(),
/* isSourceTypeExact */ false, isWholeModuleOpts);
}
return DynamicCastFeasibility::MaySucceed;
}
if (target->isBridgeableObjectType()
&& mayBridgeToObjectiveC(M, source)) {
if (target->isBridgeableObjectType() && mayBridgeToObjectiveC(M, source)) {
// Try to get the ObjC type which is bridged to source type.
assert(!source.isAnyExistentialType());
Optional<Type> ObjCTy = M->getASTContext().getBridgedToObjC(
M, /*inExpression*/ false, source, nullptr);
if (ObjCTy) {
// If the bridged ObjC type is known, check if
// this type can be casted into target type.
return classifyDynamicCast(M,
ObjCTy.getValue().getCanonicalTypeOrNull(),
target,
/* isSourceTypeExact */ false, isWholeModuleOpts);
}
return DynamicCastFeasibility::MaySucceed;
}