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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.
127 lines
3.9 KiB
C++
127 lines
3.9 KiB
C++
//===--- ARCMatchingSet.h ---------------------------------------*- C++ -*-===//
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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) 2014 - 2017 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_SILOPTIMIZER_PASSMANAGER_GLOBALARCPAIRINGANALYSIS_H
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#define SWIFT_SILOPTIMIZER_PASSMANAGER_GLOBALARCPAIRINGANALYSIS_H
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#include "GlobalARCSequenceDataflow.h"
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#include "GlobalLoopARCSequenceDataflow.h"
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#include "swift/SIL/SILValue.h"
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#include "swift/SILOptimizer/Utils/LoopUtils.h"
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#include "swift/SILOptimizer/Analysis/RCIdentityAnalysis.h"
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#include "llvm/ADT/SetVector.h"
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namespace swift {
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class SILInstruction;
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class SILFunction;
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class AliasAnalysis;
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class PostOrderAnalysis;
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class LoopRegionFunctionInfo;
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class SILLoopInfo;
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class RCIdentityFunctionInfo;
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/// A set of matching reference count increments, decrements, increment
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/// insertion pts, and decrement insertion pts.
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struct ARCMatchingSet {
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/// The pointer that this ARCMatchingSet is providing matching increment and
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/// decrement sets for.
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///
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/// TODO: This should really be called RCIdentity.
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SILValue Ptr;
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/// The set of reference count increments that were paired.
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llvm::SetVector<SILInstruction *> Increments;
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/// The set of reference count decrements that were paired.
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llvm::SetVector<SILInstruction *> Decrements;
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// This is a data structure that cannot be moved or copied.
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ARCMatchingSet() = default;
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ARCMatchingSet(const ARCMatchingSet &) = delete;
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ARCMatchingSet(ARCMatchingSet &&) = delete;
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ARCMatchingSet &operator=(const ARCMatchingSet &) = delete;
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ARCMatchingSet &operator=(ARCMatchingSet &&) = delete;
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void clear() {
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Ptr = SILValue();
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Increments.clear();
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Decrements.clear();
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}
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};
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struct MatchingSetFlags {
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bool KnownSafe;
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bool CodeMotionSafe;
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};
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static_assert(std::is_pod<MatchingSetFlags>::value,
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"MatchingSetFlags should be a pod.");
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struct ARCMatchingSetBuilder {
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using TDMapTy = BlotMapVector<SILInstruction *, TopDownRefCountState>;
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using BUMapTy = BlotMapVector<SILInstruction *, BottomUpRefCountState>;
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TDMapTy &TDMap;
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BUMapTy &BUMap;
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llvm::SmallVector<SILInstruction *, 8> NewIncrements;
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llvm::SmallVector<SILInstruction *, 8> NewDecrements;
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bool MatchedPair;
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ARCMatchingSet MatchSet;
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bool PtrIsGuaranteedArg;
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RCIdentityFunctionInfo *RCIA;
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public:
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ARCMatchingSetBuilder(TDMapTy &TDMap, BUMapTy &BUMap,
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RCIdentityFunctionInfo *RCIA)
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: TDMap(TDMap), BUMap(BUMap), MatchedPair(false),
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PtrIsGuaranteedArg(false), RCIA(RCIA) {}
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void init(SILInstruction *Inst) {
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clear();
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MatchSet.Ptr = RCIA->getRCIdentityRoot(Inst->getOperand(0));
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// If we have a function argument that is guaranteed, set the guaranteed
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// flag so we know that it is always known safe.
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if (auto *A = dyn_cast<SILFunctionArgument>(MatchSet.Ptr)) {
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auto C = A->getArgumentConvention();
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PtrIsGuaranteedArg = C == SILArgumentConvention::Direct_Guaranteed;
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}
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NewIncrements.push_back(Inst);
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}
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void clear() {
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MatchSet.clear();
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MatchedPair = false;
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NewIncrements.clear();
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NewDecrements.clear();
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}
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bool matchUpIncDecSetsForPtr();
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// We only allow for get result when this object is invalidated via a move.
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ARCMatchingSet &getResult() { return MatchSet; }
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bool matchedPair() const { return MatchedPair; }
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private:
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/// Returns .Some(MatchingSetFlags) on success and .None on failure.
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llvm::Optional<MatchingSetFlags> matchIncrementsToDecrements();
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llvm::Optional<MatchingSetFlags> matchDecrementsToIncrements();
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};
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} // end swift namespace
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#endif
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