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67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
//===- MachineDomTreeUpdater.cpp -----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the MachineDomTreeUpdater class, which provides a
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// uniform way to update dominator tree related data structures.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineDomTreeUpdater.h"
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#include "llvm/ADT/SmallSet.h"
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#include "llvm/Analysis/GenericDomTreeUpdaterImpl.h"
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#include "llvm/CodeGen/MachinePostDominators.h"
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#include "llvm/Support/GenericDomTree.h"
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#include <algorithm>
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#include <functional>
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#include <utility>
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namespace llvm {
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template class GenericDomTreeUpdater<
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MachineDomTreeUpdater, MachineDominatorTree, MachinePostDominatorTree>;
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template void
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GenericDomTreeUpdater<MachineDomTreeUpdater, MachineDominatorTree,
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MachinePostDominatorTree>::recalculate(MachineFunction
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&MF);
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bool MachineDomTreeUpdater::forceFlushDeletedBB() {
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if (DeletedBBs.empty())
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return false;
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for (auto *BB : DeletedBBs) {
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eraseDelBBNode(BB);
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BB->eraseFromParent();
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}
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DeletedBBs.clear();
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return true;
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}
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// The DT and PDT require the nodes related to updates
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// are not deleted when update functions are called.
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// So MachineBasicBlock deletions must be pended when the
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// UpdateStrategy is Lazy. When the UpdateStrategy is
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// Eager, the MachineBasicBlock will be deleted immediately.
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void MachineDomTreeUpdater::deleteBB(MachineBasicBlock *DelBB) {
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validateDeleteBB(DelBB);
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if (Strategy == UpdateStrategy::Lazy) {
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DeletedBBs.insert(DelBB);
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return;
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}
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eraseDelBBNode(DelBB);
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DelBB->eraseFromParent();
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}
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void MachineDomTreeUpdater::validateDeleteBB(MachineBasicBlock *DelBB) {
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assert(DelBB && "Invalid push_back of nullptr DelBB.");
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assert(DelBB->pred_empty() && "DelBB has one or more predecessors.");
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}
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} // namespace llvm
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