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125 lines
4.7 KiB
C++
125 lines
4.7 KiB
C++
//===-- MachineFunctionPass.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 contains the definitions of the MachineFunctionPass members.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/Analysis/BasicAliasAnalysis.h"
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#include "llvm/Analysis/DominanceFrontier.h"
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#include "llvm/Analysis/GlobalsModRef.h"
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#include "llvm/Analysis/IVUsers.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/MemoryDependenceAnalysis.h"
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/Function.h"
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using namespace llvm;
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using namespace ore;
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Pass *MachineFunctionPass::createPrinterPass(raw_ostream &O,
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const std::string &Banner) const {
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return createMachineFunctionPrinterPass(O, Banner);
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}
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bool MachineFunctionPass::runOnFunction(Function &F) {
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// Do not codegen any 'available_externally' functions at all, they have
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// definitions outside the translation unit.
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if (F.hasAvailableExternallyLinkage())
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return false;
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MachineModuleInfo &MMI = getAnalysis<MachineModuleInfo>();
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MachineFunction &MF = MMI.getOrCreateMachineFunction(F);
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MachineFunctionProperties &MFProps = MF.getProperties();
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#ifndef NDEBUG
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if (!MFProps.verifyRequiredProperties(RequiredProperties)) {
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errs() << "MachineFunctionProperties required by " << getPassName()
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<< " pass are not met by function " << F.getName() << ".\n"
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<< "Required properties: ";
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RequiredProperties.print(errs());
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errs() << "\nCurrent properties: ";
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MFProps.print(errs());
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errs() << "\n";
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llvm_unreachable("MachineFunctionProperties check failed");
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}
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#endif
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// Collect the MI count of the function before the pass.
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unsigned CountBefore, CountAfter;
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// Check if the user asked for size remarks.
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bool ShouldEmitSizeRemarks =
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F.getParent()->shouldEmitInstrCountChangedRemark();
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// If we want size remarks, collect the number of MachineInstrs in our
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// MachineFunction before the pass runs.
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if (ShouldEmitSizeRemarks)
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CountBefore = MF.getInstructionCount();
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bool RV = runOnMachineFunction(MF);
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if (ShouldEmitSizeRemarks) {
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// We wanted size remarks. Check if there was a change to the number of
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// MachineInstrs in the module. Emit a remark if there was a change.
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CountAfter = MF.getInstructionCount();
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if (CountBefore != CountAfter) {
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MachineOptimizationRemarkEmitter MORE(MF, nullptr);
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MORE.emit([&]() {
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int64_t Delta = static_cast<int64_t>(CountAfter) -
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static_cast<int64_t>(CountBefore);
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MachineOptimizationRemarkAnalysis R("size-info", "FunctionMISizeChange",
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MF.getFunction().getSubprogram(),
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&MF.front());
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R << NV("Pass", getPassName())
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<< ": Function: " << NV("Function", F.getName()) << ": "
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<< "MI Instruction count changed from "
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<< NV("MIInstrsBefore", CountBefore) << " to "
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<< NV("MIInstrsAfter", CountAfter)
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<< "; Delta: " << NV("Delta", Delta);
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return R;
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});
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}
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}
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MFProps.set(SetProperties);
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MFProps.reset(ClearedProperties);
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return RV;
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}
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void MachineFunctionPass::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<MachineModuleInfo>();
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AU.addPreserved<MachineModuleInfo>();
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// MachineFunctionPass preserves all LLVM IR passes, but there's no
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// high-level way to express this. Instead, just list a bunch of
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// passes explicitly. This does not include setPreservesCFG,
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// because CodeGen overloads that to mean preserving the MachineBasicBlock
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// CFG in addition to the LLVM IR CFG.
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AU.addPreserved<BasicAAWrapperPass>();
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AU.addPreserved<DominanceFrontierWrapperPass>();
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AU.addPreserved<DominatorTreeWrapperPass>();
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AU.addPreserved<AAResultsWrapperPass>();
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AU.addPreserved<GlobalsAAWrapperPass>();
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AU.addPreserved<IVUsersWrapperPass>();
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AU.addPreserved<LoopInfoWrapperPass>();
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AU.addPreserved<MemoryDependenceWrapperPass>();
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AU.addPreserved<ScalarEvolutionWrapperPass>();
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AU.addPreserved<SCEVAAWrapperPass>();
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FunctionPass::getAnalysisUsage(AU);
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}
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