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//===--- SILSuccessor.cpp - Implementation of SILSuccessor.h --------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/SIL/SILSuccessor.h"
#include "swift/SIL/SILBasicBlock.h"
using namespace swift;
void SILSuccessor::operator=(SILBasicBlock *BB) {
// If we're not changing anything, we're done.
if (SuccessorBlock == BB) return;
assert(ContainingInst &&"init method not called after default construction?");
// If we were already pointing to a basic block, remove ourself from its
// predecessor list.
if (SuccessorBlock) {
*Prev = Next;
if (Next) Next->Prev = Prev;
}
// If we have a successor, add ourself to its prev list.
if (BB) {
Prev = &BB->PredList;
Next = BB->PredList;
if (Next) Next->Prev = &Next;
BB->PredList = this;
}
SuccessorBlock = BB;
}
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