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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.
128 lines
3.6 KiB
C++
128 lines
3.6 KiB
C++
//===--- OwnershipPhiOperand.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) 2014 - 2020 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_SEMANTICARC_OWNERSHIPPHIOPERAND_H
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#define SWIFT_SILOPTIMIZER_SEMANTICARC_OWNERSHIPPHIOPERAND_H
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#include "swift/Basic/STLExtras.h"
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#include "swift/SIL/SILArgument.h"
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#include "swift/SIL/SILBasicBlock.h"
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#include "swift/SIL/SILInstruction.h"
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#include "swift/SIL/SILUndef.h"
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#include "swift/SIL/SILValue.h"
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namespace swift {
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namespace semanticarc {
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/// The operand of a "phi" in the induced ownership graph of a def-use graph.
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///
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/// Some examples: br, struct, tuple.
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class LLVM_LIBRARY_VISIBILITY OwnershipPhiOperand {
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public:
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enum Kind {
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Branch,
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Struct,
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Tuple,
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};
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private:
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Operand *op;
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OwnershipPhiOperand(Operand *op) : op(op) {}
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public:
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static llvm::Optional<OwnershipPhiOperand> get(const Operand *op) {
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switch (op->getUser()->getKind()) {
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case SILInstructionKind::BranchInst:
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case SILInstructionKind::StructInst:
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case SILInstructionKind::TupleInst:
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return {{const_cast<Operand *>(op)}};
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default:
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return llvm::None;
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}
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}
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Kind getKind() const {
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switch (op->getUser()->getKind()) {
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case SILInstructionKind::BranchInst:
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return Kind::Branch;
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case SILInstructionKind::StructInst:
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return Kind::Struct;
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case SILInstructionKind::TupleInst:
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return Kind::Tuple;
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default:
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llvm_unreachable("unhandled case?!");
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}
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}
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operator const Operand *() const { return op; }
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operator Operand *() { return op; }
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Operand *getOperand() const { return op; }
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SILValue getValue() const { return op->get(); }
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SILType getType() const { return op->get()->getType(); }
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unsigned getOperandNumber() const { return op->getOperandNumber(); }
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void markUndef() & {
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op->set(SILUndef::get(getType(), *op->getUser()->getFunction()));
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}
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SILInstruction *getInst() const { return op->getUser(); }
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/// Return true if this phi consumes a borrow.
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///
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/// If so, we may need to insert an extra begin_borrow to balance the +1 when
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/// converting owned ownership phis to guaranteed ownership phis.
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bool isGuaranteedConsuming() const {
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switch (getKind()) {
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case Kind::Branch:
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return true;
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case Kind::Tuple:
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case Kind::Struct:
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return false;
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}
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llvm_unreachable("unhandled operand kind!");
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}
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bool operator<(const OwnershipPhiOperand &other) const {
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return op < other.op;
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}
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bool operator==(const OwnershipPhiOperand &other) const {
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return op == other.op;
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}
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bool visitResults(function_ref<bool(SILValue)> visitor) const {
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switch (getKind()) {
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case Kind::Struct:
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return visitor(cast<StructInst>(getInst()));
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case Kind::Tuple:
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return visitor(cast<TupleInst>(getInst()));
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case Kind::Branch: {
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auto *br = cast<BranchInst>(getInst());
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unsigned opNum = getOperandNumber();
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return llvm::all_of(
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br->getSuccessorBlocks(), [&](SILBasicBlock *succBlock) {
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return visitor(succBlock->getSILPhiArguments()[opNum]);
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});
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}
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}
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llvm_unreachable("unhandled operand kind!");
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}
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};
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} // namespace semanticarc
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} // namespace swift
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#endif // SWIFT_SILOPTIMIZER_SEMANTICARC_OWNERSHIPPHIOPERAND_H
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