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011358edd6
This removes the ambiguity when casting from a SingleValueInstruction to SILNode, which makes the code simpler. E.g. the "isRepresentativeSILNode" logic is not needed anymore. Also, it reduces the size of the most used instruction class - SingleValueInstruction - by one pointer. Conceptually, SILInstruction is still a SILNode. But implementation-wise SILNode is not a base class of SILInstruction anymore. Only the two sub-classes of SILInstruction - SingleValueInstruction and NonSingleValueInstruction - inherit from SILNode. SingleValueInstruction's SILNode is embedded into a ValueBase and its relative offset in the class is the same as in NonSingleValueInstruction (see SILNodeOffsetChecker). This makes it possible to cast from a SILInstruction to a SILNode without knowing which SILInstruction sub-class it is. Casting to SILNode cannot be done implicitly, but only with an LLVM `cast` or with SILInstruction::asSILNode(). But this is a rare case anyway.
31 lines
964 B
C++
31 lines
964 B
C++
//===--- SILUndef.cpp -----------------------------------------------------===//
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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 - 2018 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 "swift/SIL/SILUndef.h"
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#include "swift/SIL/SILModule.h"
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using namespace swift;
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SILUndef::SILUndef(SILType type)
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: ValueBase(ValueKind::SILUndef, type) {}
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SILUndef *SILUndef::get(SILType ty, SILModule &m) {
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SILUndef *&entry = m.UndefValues[ty];
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if (entry == nullptr)
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entry = new (m) SILUndef(ty);
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return entry;
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}
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SILUndef *SILUndef::get(SILType ty, const SILFunction &f) {
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return SILUndef::get(ty, f.getModule());
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}
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