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Summary: DominatorTreeBase used to have IsPostDominators (bool) member to indicate if the tree is a dominator or a postdominator tree. This made it possible to switch between the two 'modes' at runtime, but it isn't used in practice anywhere. This patch makes IsPostDominator a template argument. This way, it is easier to switch between different algorithms at compile-time based on this argument and design external utilities around it. It also makes it impossible to incidentally assign a postdominator tree to a dominator tree (and vice versa), and to further simplify template code in GenericDominatorTreeConstruction. Reviewers: dberlin, sanjoy, davide, grosser Reviewed By: dberlin Subscribers: mzolotukhin, llvm-commits Differential Revision: https://reviews.llvm.org/D35315 llvm-svn: 308040
59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
//===- MachinePostDominators.cpp -Machine Post Dominator Calculation ------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements simple dominator construction algorithms for finding
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// post dominators on machine functions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachinePostDominators.h"
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using namespace llvm;
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namespace llvm {
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template class DominatorTreeBase<MachineBasicBlock, true>; // PostDomTreeBase
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}
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char MachinePostDominatorTree::ID = 0;
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//declare initializeMachinePostDominatorTreePass
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INITIALIZE_PASS(MachinePostDominatorTree, "machinepostdomtree",
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"MachinePostDominator Tree Construction", true, true)
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MachinePostDominatorTree::MachinePostDominatorTree() : MachineFunctionPass(ID) {
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initializeMachinePostDominatorTreePass(*PassRegistry::getPassRegistry());
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DT = new PostDomTreeBase<MachineBasicBlock>();
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}
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FunctionPass *
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MachinePostDominatorTree::createMachinePostDominatorTreePass() {
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return new MachinePostDominatorTree();
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}
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bool
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MachinePostDominatorTree::runOnMachineFunction(MachineFunction &F) {
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DT->recalculate(F);
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return false;
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}
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MachinePostDominatorTree::~MachinePostDominatorTree() {
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delete DT;
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}
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void
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MachinePostDominatorTree::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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void
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MachinePostDominatorTree::print(llvm::raw_ostream &OS, const Module *M) const {
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DT->print(OS);
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}
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