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f3ff561c6f
This is phase-1 of switching from llvm::Optional to std::optional in the
next rebranch. llvm::Optional was removed from upstream LLVM, so we need
to migrate off rather soon. On Darwin, std::optional, and llvm::Optional
have the same layout, so we don't need to be as concerned about ABI
beyond the name mangling. `llvm::Optional` is only returned from one
function in
```
getStandardTypeSubst(StringRef TypeName,
bool allowConcurrencyManglings);
```
It's the return value, so it should not impact the mangling of the
function, and the layout is the same as `std::optional`, so it should be
mostly okay. This function doesn't appear to have users, and the ABI was
already broken 2 years ago for concurrency and no one seemed to notice
so this should be "okay".
I'm doing the migration incrementally so that folks working on main can
cherry-pick back to the release/5.9 branch. Once 5.9 is done and locked
away, then we can go through and finish the replacement. Since `None`
and `Optional` show up in contexts where they are not `llvm::None` and
`llvm::Optional`, I'm preparing the work now by going through and
removing the namespace unwrapping and making the `llvm` namespace
explicit. This should make it fairly mechanical to go through and
replace llvm::Optional with std::optional, and llvm::None with
std::nullopt. It's also a change that can be brought onto the
release/5.9 with minimal impact. This should be an NFC change.
48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
//===--- ImportDepth.h ----------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2022 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IDE_IMPORTDEPTH_H
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#define SWIFT_IDE_IMPORTDEPTH_H
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#include "swift/AST/ASTContext.h"
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#include "swift/Basic/LLVM.h"
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#include "swift/Frontend/FrontendOptions.h"
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#include "llvm/ADT/StringMap.h"
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namespace swift {
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namespace ide {
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/// A utility for calculating the import depth of a given module. Direct imports
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/// have depth 1, imports of those modules have depth 2, etc.
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///
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/// Special modules such as Playground auxiliary sources are considered depth
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/// 0.
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class ImportDepth {
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llvm::StringMap<uint8_t> depths;
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public:
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ImportDepth() = default;
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ImportDepth(ASTContext &context, const FrontendOptions &frontendOptions);
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llvm::Optional<uint8_t> lookup(StringRef module) {
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auto I = depths.find(module);
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if (I == depths.end())
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return llvm::None;
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return I->getValue();
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}
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};
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} // end namespace ide
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} // end namespace swift
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#endif // SWIFT_IDE_IMPORTDEPTH_H
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