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//===-- MachineFunctionPass.cpp -------------------------------------------===//
//
// 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 contains the definitions of the MachineFunctionPass members.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Analysis/BasicAliasAnalysis.h"
#include "llvm/Analysis/DominanceFrontier.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/IVUsers.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/MemoryDependenceAnalysis.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/PrintPasses.h"
using namespace llvm;
using namespace ore;
Pass *MachineFunctionPass::createPrinterPass(raw_ostream &O,
const std::string &Banner) const {
return createMachineFunctionPrinterPass(O, Banner);
}
bool MachineFunctionPass::runOnFunction(Function &F) {
// Do not codegen any 'available_externally' functions at all, they have
// definitions outside the translation unit.
if (F.hasAvailableExternallyLinkage())
return false;
MachineModuleInfo &MMI = getAnalysis<MachineModuleInfoWrapperPass>().getMMI();
MachineFunction &MF = MMI.getOrCreateMachineFunction(F);
MachineFunctionProperties &MFProps = MF.getProperties();
#ifndef NDEBUG
if (!MFProps.verifyRequiredProperties(RequiredProperties)) {
errs() << "MachineFunctionProperties required by " << getPassName()
<< " pass are not met by function " << F.getName() << ".\n"
<< "Required properties: ";
RequiredProperties.print(errs());
errs() << "\nCurrent properties: ";
MFProps.print(errs());
errs() << "\n";
llvm_unreachable("MachineFunctionProperties check failed");
}
#endif
// Collect the MI count of the function before the pass.
unsigned CountBefore, CountAfter;
// Check if the user asked for size remarks.
bool ShouldEmitSizeRemarks =
F.getParent()->shouldEmitInstrCountChangedRemark();
// If we want size remarks, collect the number of MachineInstrs in our
// MachineFunction before the pass runs.
if (ShouldEmitSizeRemarks)
CountBefore = MF.getInstructionCount();
// For --print-changed, if the function name is a candidate, save the
// serialized MF to be compared later.
// TODO Implement --filter-passes.
SmallString<0> BeforeStr, AfterStr;
bool ShouldPrintChanged = PrintChanged != ChangePrinter::None &&
isFunctionInPrintList(MF.getName());
if (ShouldPrintChanged) {
raw_svector_ostream OS(BeforeStr);
MF.print(OS);
}
bool RV = runOnMachineFunction(MF);
if (ShouldEmitSizeRemarks) {
// We wanted size remarks. Check if there was a change to the number of
// MachineInstrs in the module. Emit a remark if there was a change.
CountAfter = MF.getInstructionCount();
if (CountBefore != CountAfter) {
MachineOptimizationRemarkEmitter MORE(MF, nullptr);
MORE.emit([&]() {
int64_t Delta = static_cast<int64_t>(CountAfter) -
static_cast<int64_t>(CountBefore);
MachineOptimizationRemarkAnalysis R("size-info", "FunctionMISizeChange",
MF.getFunction().getSubprogram(),
&MF.front());
R << NV("Pass", getPassName())
<< ": Function: " << NV("Function", F.getName()) << ": "
<< "MI Instruction count changed from "
<< NV("MIInstrsBefore", CountBefore) << " to "
<< NV("MIInstrsAfter", CountAfter)
<< "; Delta: " << NV("Delta", Delta);
return R;
});
}
}
MFProps.set(SetProperties);
MFProps.reset(ClearedProperties);
// For --print-changed, print if the serialized MF has changed. Modes other
// than quiet/verbose are unimplemented and treated the same as 'quiet'.
if (ShouldPrintChanged) {
raw_svector_ostream OS(AfterStr);
MF.print(OS);
if (BeforeStr != AfterStr) {
StringRef Arg;
if (const PassInfo *PI = Pass::lookupPassInfo(getPassID()))
Arg = PI->getPassArgument();
errs() << ("*** IR Dump After " + getPassName() + " (" + Arg + ") on " +
MF.getName() + " ***\n" + AfterStr);
} else if (PrintChanged == ChangePrinter::Verbose) {
errs() << ("*** IR Dump After " + getPassName() + " on " + MF.getName() +
" omitted because no change ***\n");
}
}
return RV;
}
void MachineFunctionPass::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<MachineModuleInfoWrapperPass>();
AU.addPreserved<MachineModuleInfoWrapperPass>();
// MachineFunctionPass preserves all LLVM IR passes, but there's no
// high-level way to express this. Instead, just list a bunch of
// passes explicitly. This does not include setPreservesCFG,
// because CodeGen overloads that to mean preserving the MachineBasicBlock
// CFG in addition to the LLVM IR CFG.
AU.addPreserved<BasicAAWrapperPass>();
AU.addPreserved<DominanceFrontierWrapperPass>();
AU.addPreserved<DominatorTreeWrapperPass>();
AU.addPreserved<AAResultsWrapperPass>();
AU.addPreserved<GlobalsAAWrapperPass>();
AU.addPreserved<IVUsersWrapperPass>();
AU.addPreserved<LoopInfoWrapperPass>();
AU.addPreserved<MemoryDependenceWrapperPass>();
AU.addPreserved<ScalarEvolutionWrapperPass>();
AU.addPreserved<SCEVAAWrapperPass>();
FunctionPass::getAnalysisUsage(AU);
}
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