averello/swift-mirror
1
0
Fork 0
mirror of https://github.com/apple/swift.git synced 2025-12-14 20:36:38 +01:00
Code Issues Packages Projects Releases Wiki Activity

[ConstraintSystem] Don't introduce implicit keypath choice for keypath dynamic member lookup

Browse Source
This commit is contained in:
Pavel Yaskevich
2019-03-27 01:07:50 -07:00
parent 7032095b53
commit 41f6eb9a15
2 changed files with 25 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
lib/Sema/CSSimplify.cpp
View File

@@ -3537,6 +3537,10 @@ static bool hasDynamicMemberLookupAttribute(Type type,
return result;
}
static bool isKeyPathDynamicMemberLookup(ConstraintLocator *locator) {
auto path = locator ? locator->getPath() : None;
return !path.empty() && path.back().isKeyPathDynamicMember();
}
/// Given a ValueMember, UnresolvedValueMember, or TypeMember constraint,
/// perform a lookup into the specified base type to find a candidate list.
@@ -3568,10 +3572,15 @@ performMemberLookup(ConstraintKind constraintKind, DeclName memberName,
// Okay, start building up the result list.
MemberLookupResult result;
result.OverallResult = MemberLookupResult::HasResults;
// If we're looking for a subscript, consider key path operations.
//
// TODO: This logic needs to be refactored to make sure that implicit
// keypath result is only introduced when it makes sense e.g. if there
// is a single argument with `keypath:` label or `\.` syntax is used.
if (memberName.isSimpleName() &&
memberName.getBaseName().getKind() == DeclBaseName::Kind::Subscript) {
memberName.getBaseName().getKind() == DeclBaseName::Kind::Subscript &&
!isKeyPathDynamicMemberLookup(memberLocator)) {
result.ViableCandidates.push_back(
OverloadChoice(baseTy, OverloadChoiceKind::KeyPathApplication));
}
@@ -3831,20 +3840,18 @@ performMemberLookup(ConstraintKind constraintKind, DeclName memberName,
// based dynamic member lookup. Since it's unknown upfront
// what kind of declaration lookup is going to find, let's
// double check here that given keypath is appropriate for it.
if (memberLocator) {
if (isKeyPathDynamicMemberLookup(memberLocator)) {
auto path = memberLocator->getPath();
if (!path.empty() && path.back().isKeyPathDynamicMember()) {
auto *keyPath = path.back().getKeyPath();
if (auto *storage = dyn_cast<AbstractStorageDecl>(decl)) {
// If this is an attempt to access read-only member via
// writable key path, let's fail this choice early.
if (isReadOnlyKeyPathComponent(storage) &&
keyPath == getASTContext().getWritableKeyPathDecl()) {
result.addUnviable(
candidate,
MemberLookupResult::UR_WritableKeyPathOnReadOnlyMember);
return;
}
auto *keyPath = path.back().getKeyPath();
if (auto *storage = dyn_cast<AbstractStorageDecl>(decl)) {
// If this is an attempt to access read-only member via
// writable key path, let's fail this choice early.
if (isReadOnlyKeyPathComponent(storage) &&
keyPath == getASTContext().getWritableKeyPathDecl()) {
result.addUnviable(
candidate,
MemberLookupResult::UR_WritableKeyPathOnReadOnlyMember);
return;
}
}
}