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//===- ReducerWorkItem.cpp - Wrapper for Module and MachineFunction -------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "ReducerWorkItem.h"
#include "llvm/CodeGen/MIRParser/MIRParser.h"
#include "llvm/CodeGen/MIRPrinter.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Transforms/Utils/Cloning.h"
static std::unique_ptr<MachineFunction> cloneMF(MachineFunction *SrcMF) {
auto DstMF = std::make_unique<MachineFunction>(
SrcMF->getFunction(), SrcMF->getTarget(), SrcMF->getSubtarget(),
SrcMF->getFunctionNumber(), SrcMF->getMMI());
DenseMap<MachineBasicBlock *, MachineBasicBlock *> Src2DstMBB;
DenseMap<Register, Register> Src2DstReg;
auto *SrcMRI = &SrcMF->getRegInfo();
auto *DstMRI = &DstMF->getRegInfo();
// Create vregs.
for (auto &SrcMBB : *SrcMF) {
for (auto &SrcMI : SrcMBB) {
for (unsigned I = 0, E = SrcMI.getNumOperands(); I < E; ++I) {
auto &DMO = SrcMI.getOperand(I);
if (!DMO.isReg() || !DMO.isDef())
continue;
Register SrcReg = DMO.getReg();
if (Register::isPhysicalRegister(SrcReg))
continue;
auto SrcRC = SrcMRI->getRegClass(SrcReg);
auto DstReg = DstMRI->createVirtualRegister(SrcRC);
Src2DstReg[SrcReg] = DstReg;
}
}
}
// Clone blocks.
for (auto &SrcMBB : *SrcMF)
Src2DstMBB[&SrcMBB] = DstMF->CreateMachineBasicBlock();
// Link blocks.
for (auto &SrcMBB : *SrcMF) {
auto *DstMBB = Src2DstMBB[&SrcMBB];
DstMF->push_back(DstMBB);
for (auto It = SrcMBB.succ_begin(), IterEnd = SrcMBB.succ_end();
It != IterEnd; ++It) {
auto *SrcSuccMBB = *It;
auto *DstSuccMBB = Src2DstMBB[SrcSuccMBB];
DstMBB->addSuccessor(DstSuccMBB);
}
for (auto &LI : SrcMBB.liveins())
DstMBB->addLiveIn(LI);
}
// Clone instructions.
for (auto &SrcMBB : *SrcMF) {
auto *DstMBB = Src2DstMBB[&SrcMBB];
for (auto &SrcMI : SrcMBB) {
const auto &MCID =
DstMF->getSubtarget().getInstrInfo()->get(SrcMI.getOpcode());
auto *DstMI = DstMF->CreateMachineInstr(MCID, SrcMI.getDebugLoc(),
/*NoImplicit=*/true);
DstMBB->push_back(DstMI);
for (auto &SrcMO : SrcMI.operands()) {
MachineOperand DstMO(SrcMO);
DstMO.clearParent();
// Update vreg.
if (DstMO.isReg() && Src2DstReg.count(DstMO.getReg())) {
DstMO.setReg(Src2DstReg[DstMO.getReg()]);
}
// Update MBB.
if (DstMO.isMBB()) {
DstMO.setMBB(Src2DstMBB[DstMO.getMBB()]);
}
DstMI->addOperand(DstMO);
}
DstMI->setMemRefs(*DstMF, SrcMI.memoperands());
}
}
DstMF->verify(nullptr, "", /*AbortOnError=*/true);
return DstMF;
}
std::unique_ptr<ReducerWorkItem> parseReducerWorkItem(StringRef Filename,
LLVMContext &Ctxt,
MachineModuleInfo *MMI) {
auto MMM = std::make_unique<ReducerWorkItem>();
if (MMI) {
auto FileOrErr = MemoryBuffer::getFileOrSTDIN(Filename, /*IsText=*/true);
std::unique_ptr<MIRParser> MParser =
createMIRParser(std::move(FileOrErr.get()), Ctxt);
auto SetDataLayout =
[&](StringRef DataLayoutTargetTriple) -> Optional<std::string> {
return MMI->getTarget().createDataLayout().getStringRepresentation();
};
std::unique_ptr<Module> M = MParser->parseIRModule(SetDataLayout);
MParser->parseMachineFunctions(*M, *MMI);
MachineFunction *MF = nullptr;
for (auto &F : *M) {
if (auto *MF4F = MMI->getMachineFunction(F)) {
// XXX: Maybe it would not be a lot of effort to handle multiple MFs by
// simply storing them in a ReducerWorkItem::SmallVector or similar. The
// single MF use-case seems a lot more common though so that will do for
// now.
assert(!MF && "Only single MF supported!");
MF = MF4F;
}
}
assert(MF && "No MF found!");
MMM->M = std::move(M);
MMM->MF = cloneMF(MF);
} else {
SMDiagnostic Err;
std::unique_ptr<Module> Result = parseIRFile(Filename, Err, Ctxt);
if (!Result) {
Err.print("llvm-reduce", errs());
return std::unique_ptr<ReducerWorkItem>();
}
MMM->M = std::move(Result);
}
if (verifyReducerWorkItem(*MMM, &errs())) {
errs() << "Error: " << Filename << " - input module is broken!\n";
return std::unique_ptr<ReducerWorkItem>();
}
return MMM;
}
std::unique_ptr<ReducerWorkItem>
cloneReducerWorkItem(const ReducerWorkItem &MMM) {
auto CloneMMM = std::make_unique<ReducerWorkItem>();
if (MMM.MF) {
// Note that we cannot clone the Module as then we would need a way to
// updated the cloned MachineFunction's IR references.
// XXX: Actually have a look at
// std::unique_ptr<Module> CloneModule(const Module &M, ValueToValueMapTy
// &VMap);
CloneMMM->M = MMM.M;
CloneMMM->MF = cloneMF(MMM.MF.get());
} else {
CloneMMM->M = CloneModule(*MMM.M);
}
return CloneMMM;
}
bool verifyReducerWorkItem(const ReducerWorkItem &MMM, raw_fd_ostream *OS) {
if (verifyModule(*MMM.M, OS))
return true;
if (MMM.MF && !MMM.MF->verify(nullptr, "", /*AbortOnError=*/false))
return true;
return false;
}
void ReducerWorkItem::print(raw_ostream &ROS, void *p) const {
if (MF) {
printMIR(ROS, *M);
printMIR(ROS, *MF);
} else {
M->print(ROS, /*AssemblyAnnotationWriter=*/nullptr,
/*ShouldPreserveUseListOrder=*/true);
}
}
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