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This iterator is not actually a SILSuccessorIterator since it is not iterating over the "successors" of a block. Instead it is used to given the head of a CFG edge, iterate over the CFG edge's predecessors using the double linked list stored inside SILSuccessor. This rename/refactor ties SILSuccessor closer to SILSuccessorIterator and makes it clear what we are actually iterating over.
52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
//===--- SILSuccessor.cpp - Implementation of SILSuccessor.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 - 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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#include "swift/SIL/SILSuccessor.h"
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#include "swift/SIL/SILBasicBlock.h"
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using namespace swift;
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void SILSuccessor::operator=(SILBasicBlock *BB) {
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// If we're not changing anything, we're done.
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if (SuccessorBlock == BB) return;
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assert(ContainingInst &&"init method not called after default construction?");
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// If we were already pointing to a basic block, remove ourself from its
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// predecessor list.
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if (SuccessorBlock) {
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*Prev = Next;
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if (Next) Next->Prev = Prev;
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}
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// If we have a successor, add ourself to its prev list.
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if (BB) {
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Prev = &BB->PredList;
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Next = BB->PredList;
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if (Next) Next->Prev = &Next;
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BB->PredList = this;
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}
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SuccessorBlock = BB;
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}
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// Dereferencing the pred_iterator returns the predecessor's SILBasicBlock.
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SILBasicBlock *SILSuccessor::pred_iterator::operator*() {
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assert(Cur && "Can't deference end (or default constructed) iterator");
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return Cur->ContainingInst->getParent();
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}
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// Dereferencing the pred_iterator returns the predecessor's SILBasicBlock.
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const SILBasicBlock *SILSuccessor::pred_iterator::operator*() const {
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assert(Cur && "Can't deference end (or default constructed) iterator");
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return Cur->ContainingInst->getParent();
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}
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