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//===- MachinePostDominators.cpp -Machine Post Dominator Calculation ------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements simple dominator construction algorithms for finding
// post dominators on machine functions.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachinePostDominators.h"
#include "llvm/InitializePasses.h"
#include "llvm/Support/GenericDomTreeConstruction.h"
using namespace llvm;
namespace llvm {
template class LLVM_EXPORT_TEMPLATE
DominatorTreeBase<MachineBasicBlock, true>; // PostDomTreeBase
namespace DomTreeBuilder {
template LLVM_EXPORT_TEMPLATE void
Calculate<MBBPostDomTree>(MBBPostDomTree &DT);
template LLVM_EXPORT_TEMPLATE void
InsertEdge<MBBPostDomTree>(MBBPostDomTree &DT, MachineBasicBlock *From,
MachineBasicBlock *To);
template LLVM_EXPORT_TEMPLATE void
DeleteEdge<MBBPostDomTree>(MBBPostDomTree &DT, MachineBasicBlock *From,
MachineBasicBlock *To);
template LLVM_EXPORT_TEMPLATE void
ApplyUpdates<MBBPostDomTree>(MBBPostDomTree &DT, MBBPostDomTreeGraphDiff &,
MBBPostDomTreeGraphDiff *);
template LLVM_EXPORT_TEMPLATE bool
Verify<MBBPostDomTree>(const MBBPostDomTree &DT,
MBBPostDomTree::VerificationLevel VL);
} // namespace DomTreeBuilder
extern bool VerifyMachineDomInfo;
} // namespace llvm
AnalysisKey MachinePostDominatorTreeAnalysis::Key;
MachinePostDominatorTreeAnalysis::Result
MachinePostDominatorTreeAnalysis::run(MachineFunction &MF,
MachineFunctionAnalysisManager &) {
return MachinePostDominatorTree(MF);
}
PreservedAnalyses
MachinePostDominatorTreePrinterPass::run(MachineFunction &MF,
MachineFunctionAnalysisManager &MFAM) {
OS << "MachinePostDominatorTree for machine function: " << MF.getName()
<< '\n';
MFAM.getResult<MachinePostDominatorTreeAnalysis>(MF).print(OS);
return PreservedAnalyses::all();
}
char MachinePostDominatorTreeWrapperPass::ID = 0;
//declare initializeMachinePostDominatorTreePass
INITIALIZE_PASS(MachinePostDominatorTreeWrapperPass, "machinepostdomtree",
"MachinePostDominator Tree Construction", true, true)
MachinePostDominatorTreeWrapperPass::MachinePostDominatorTreeWrapperPass()
: MachineFunctionPass(ID), PDT() {
initializeMachinePostDominatorTreeWrapperPassPass(
*PassRegistry::getPassRegistry());
}
bool MachinePostDominatorTreeWrapperPass::runOnMachineFunction(
MachineFunction &F) {
PDT = MachinePostDominatorTree();
PDT->recalculate(F);
return false;
}
void MachinePostDominatorTreeWrapperPass::getAnalysisUsage(
AnalysisUsage &AU) const {
AU.setPreservesAll();
MachineFunctionPass::getAnalysisUsage(AU);
}
bool MachinePostDominatorTree::invalidate(
MachineFunction &, const PreservedAnalyses &PA,
MachineFunctionAnalysisManager::Invalidator &) {
// Check whether the analysis, all analyses on machine functions, or the
// machine function's CFG have been preserved.
auto PAC = PA.getChecker<MachinePostDominatorTreeAnalysis>();
return !PAC.preserved() &&
!PAC.preservedSet<AllAnalysesOn<MachineFunction>>() &&
!PAC.preservedSet<CFGAnalyses>();
}
MachineBasicBlock *MachinePostDominatorTree::findNearestCommonDominator(
ArrayRef<MachineBasicBlock *> Blocks) const {
assert(!Blocks.empty());
MachineBasicBlock *NCD = Blocks.consume_front();
for (MachineBasicBlock *BB : Blocks) {
NCD = Base::findNearestCommonDominator(NCD, BB);
// Stop when the root is reached.
if (isVirtualRoot(getNode(NCD)))
return nullptr;
}
return NCD;
}
void MachinePostDominatorTreeWrapperPass::verifyAnalysis() const {
if (VerifyMachineDomInfo && PDT &&
!PDT->verify(MachinePostDominatorTree::VerificationLevel::Basic))
report_fatal_error("MachinePostDominatorTree verification failed!");
}
void MachinePostDominatorTreeWrapperPass::print(llvm::raw_ostream &OS,
const Module *M) const {
PDT->print(OS);
}
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