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51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
//===--- ARCSequenceOptUtils.cpp - ARCSequenceOpt utilities ------------===//
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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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#include "ARCSequenceOptUtils.h"
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using namespace swift;
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namespace swift {
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bool isARCSignificantTerminator(TermInst *TI) {
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switch (TI->getTermKind()) {
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case TermKind::UnreachableInst:
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// br is a forwarding use for its arguments. It cannot in of itself extend
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// the lifetime of an object (just like a phi-node) cannot.
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case TermKind::BranchInst:
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// A cond_br is a forwarding use for its non-operand arguments in a similar
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// way to br. Its operand must be an i1 that has a different lifetime from any
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// ref counted object.
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case TermKind::CondBranchInst:
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return false;
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// Be conservative for now. These actually perform some sort of operation
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// against the operand or can use the value in some way.
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case TermKind::ThrowInst:
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case TermKind::ThrowAddrInst:
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case TermKind::ReturnInst:
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case TermKind::ReturnBorrowInst:
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case TermKind::UnwindInst:
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case TermKind::YieldInst:
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case TermKind::AwaitAsyncContinuationInst:
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case TermKind::TryApplyInst:
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case TermKind::SwitchValueInst:
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case TermKind::SwitchEnumInst:
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case TermKind::SwitchEnumAddrInst:
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case TermKind::DynamicMethodBranchInst:
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case TermKind::CheckedCastBranchInst:
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case TermKind::CheckedCastAddrBranchInst:
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return true;
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}
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llvm_unreachable("Unhandled TermKind in switch.");
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}
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} // end namespace 'swift'
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