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llvm-mirror/tools/llvm-mca/llvm-mca.cpp
Philipp Krones df7a8b162e [MC] Refactor MCObjectFileInfo initialization and allow targets to create MCObjectFileInfo 
This makes it possible for targets to define their own MCObjectFileInfo.
This MCObjectFileInfo is then used to determine things like section alignment.

This is a follow up to D101462 and prepares for the RISCV backend defining the
text section alignment depending on the enabled extensions.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D101921
2021-05-23 14:15:23 -07:00

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//===-- llvm-mca.cpp - Machine Code Analyzer -------------------*- C++ -* -===//
//
// 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 utility is a simple driver that allows static performance analysis on
// machine code similarly to how IACA (Intel Architecture Code Analyzer) works.
//
// llvm-mca [options] <file-name>
// -march <type>
// -mcpu <cpu>
// -o <file>
//
// The target defaults to the host target.
// The cpu defaults to the 'native' host cpu.
// The output defaults to standard output.
//
//===----------------------------------------------------------------------===//
#include "CodeRegion.h"
#include "CodeRegionGenerator.h"
#include "PipelinePrinter.h"
#include "Views/BottleneckAnalysis.h"
#include "Views/DispatchStatistics.h"
#include "Views/InstructionInfoView.h"
#include "Views/RegisterFileStatistics.h"
#include "Views/ResourcePressureView.h"
#include "Views/RetireControlUnitStatistics.h"
#include "Views/SchedulerStatistics.h"
#include "Views/SummaryView.h"
#include "Views/TimelineView.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCTargetOptionsCommandFlags.h"
#include "llvm/MCA/CodeEmitter.h"
#include "llvm/MCA/Context.h"
#include "llvm/MCA/InstrBuilder.h"
#include "llvm/MCA/Pipeline.h"
#include "llvm/MCA/Stages/EntryStage.h"
#include "llvm/MCA/Stages/InstructionTables.h"
#include "llvm/MCA/Support.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/WithColor.h"
using namespace llvm;
static mc::RegisterMCTargetOptionsFlags MOF;
static cl::OptionCategory ToolOptions("Tool Options");
static cl::OptionCategory ViewOptions("View Options");
static cl::opt<std::string> InputFilename(cl::Positional,
cl::desc("<input file>"),
cl::cat(ToolOptions), cl::init("-"));
static cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"),
cl::init("-"), cl::cat(ToolOptions),
cl::value_desc("filename"));
static cl::opt<std::string>
ArchName("march",
cl::desc("Target architecture. "
"See -version for available targets"),
cl::cat(ToolOptions));
static cl::opt<std::string>
TripleName("mtriple",
cl::desc("Target triple. See -version for available targets"),
cl::cat(ToolOptions));
static cl::opt<std::string>
MCPU("mcpu",
cl::desc("Target a specific cpu type (-mcpu=help for details)"),
cl::value_desc("cpu-name"), cl::cat(ToolOptions), cl::init("native"));
static cl::opt<std::string>
MATTR("mattr",
cl::desc("Additional target features."),
cl::cat(ToolOptions));
static cl::opt<bool>
PrintJson("json",
cl::desc("Print the output in json format"),
cl::cat(ToolOptions), cl::init(false));
static cl::opt<int>
OutputAsmVariant("output-asm-variant",
cl::desc("Syntax variant to use for output printing"),
cl::cat(ToolOptions), cl::init(-1));
static cl::opt<bool>
PrintImmHex("print-imm-hex", cl::cat(ToolOptions), cl::init(false),
cl::desc("Prefer hex format when printing immediate values"));
static cl::opt<unsigned> Iterations("iterations",
cl::desc("Number of iterations to run"),
cl::cat(ToolOptions), cl::init(0));
static cl::opt<unsigned>
DispatchWidth("dispatch", cl::desc("Override the processor dispatch width"),
cl::cat(ToolOptions), cl::init(0));
static cl::opt<unsigned>
RegisterFileSize("register-file-size",
cl::desc("Maximum number of physical registers which can "
"be used for register mappings"),
cl::cat(ToolOptions), cl::init(0));
static cl::opt<unsigned>
MicroOpQueue("micro-op-queue-size", cl::Hidden,
cl::desc("Number of entries in the micro-op queue"),
cl::cat(ToolOptions), cl::init(0));
static cl::opt<unsigned>
DecoderThroughput("decoder-throughput", cl::Hidden,
cl::desc("Maximum throughput from the decoders "
"(instructions per cycle)"),
cl::cat(ToolOptions), cl::init(0));
static cl::opt<bool>
PrintRegisterFileStats("register-file-stats",
cl::desc("Print register file statistics"),
cl::cat(ViewOptions), cl::init(false));
static cl::opt<bool> PrintDispatchStats("dispatch-stats",
cl::desc("Print dispatch statistics"),
cl::cat(ViewOptions), cl::init(false));
static cl::opt<bool>
PrintSummaryView("summary-view", cl::Hidden,
cl::desc("Print summary view (enabled by default)"),
cl::cat(ViewOptions), cl::init(true));
static cl::opt<bool> PrintSchedulerStats("scheduler-stats",
cl::desc("Print scheduler statistics"),
cl::cat(ViewOptions), cl::init(false));
static cl::opt<bool>
PrintRetireStats("retire-stats",
cl::desc("Print retire control unit statistics"),
cl::cat(ViewOptions), cl::init(false));
static cl::opt<bool> PrintResourcePressureView(
"resource-pressure",
cl::desc("Print the resource pressure view (enabled by default)"),
cl::cat(ViewOptions), cl::init(true));
static cl::opt<bool> PrintTimelineView("timeline",
cl::desc("Print the timeline view"),
cl::cat(ViewOptions), cl::init(false));
static cl::opt<unsigned> TimelineMaxIterations(
"timeline-max-iterations",
cl::desc("Maximum number of iterations to print in timeline view"),
cl::cat(ViewOptions), cl::init(0));
static cl::opt<unsigned> TimelineMaxCycles(
"timeline-max-cycles",
cl::desc(
"Maximum number of cycles in the timeline view. Defaults to 80 cycles"),
cl::cat(ViewOptions), cl::init(80));
static cl::opt<bool>
AssumeNoAlias("noalias",
cl::desc("If set, assume that loads and stores do not alias"),
cl::cat(ToolOptions), cl::init(true));
static cl::opt<unsigned> LoadQueueSize("lqueue",
cl::desc("Size of the load queue"),
cl::cat(ToolOptions), cl::init(0));
static cl::opt<unsigned> StoreQueueSize("squeue",
cl::desc("Size of the store queue"),
cl::cat(ToolOptions), cl::init(0));
static cl::opt<bool>
PrintInstructionTables("instruction-tables",
cl::desc("Print instruction tables"),
cl::cat(ToolOptions), cl::init(false));
static cl::opt<bool> PrintInstructionInfoView(
"instruction-info",
cl::desc("Print the instruction info view (enabled by default)"),
cl::cat(ViewOptions), cl::init(true));
static cl::opt<bool> EnableAllStats("all-stats",
cl::desc("Print all hardware statistics"),
cl::cat(ViewOptions), cl::init(false));
static cl::opt<bool>
EnableAllViews("all-views",
cl::desc("Print all views including hardware statistics"),
cl::cat(ViewOptions), cl::init(false));
static cl::opt<bool> EnableBottleneckAnalysis(
"bottleneck-analysis",
cl::desc("Enable bottleneck analysis (disabled by default)"),
cl::cat(ViewOptions), cl::init(false));
static cl::opt<bool> ShowEncoding(
"show-encoding",
cl::desc("Print encoding information in the instruction info view"),
cl::cat(ViewOptions), cl::init(false));
namespace {
const Target *getTarget(const char *ProgName) {
if (TripleName.empty())
TripleName = Triple::normalize(sys::getDefaultTargetTriple());
Triple TheTriple(TripleName);
// Get the target specific parser.
std::string Error;
const Target *TheTarget =
TargetRegistry::lookupTarget(ArchName, TheTriple, Error);
if (!TheTarget) {
errs() << ProgName << ": " << Error;
return nullptr;
}
// Update TripleName with the updated triple from the target lookup.
TripleName = TheTriple.str();
// Return the found target.
return TheTarget;
}
ErrorOr<std::unique_ptr<ToolOutputFile>> getOutputStream() {
if (OutputFilename == "")
OutputFilename = "-";
std::error_code EC;
auto Out = std::make_unique<ToolOutputFile>(OutputFilename, EC,
sys::fs::OF_TextWithCRLF);
if (!EC)
return std::move(Out);
return EC;
}
} // end of anonymous namespace
static void processOptionImpl(cl::opt<bool> &O, const cl::opt<bool> &Default) {
if (!O.getNumOccurrences() || O.getPosition() < Default.getPosition())
O = Default.getValue();
}
static void processViewOptions(bool IsOutOfOrder) {
if (!EnableAllViews.getNumOccurrences() &&
!EnableAllStats.getNumOccurrences())
return;
if (EnableAllViews.getNumOccurrences()) {
processOptionImpl(PrintSummaryView, EnableAllViews);
if (IsOutOfOrder)
processOptionImpl(EnableBottleneckAnalysis, EnableAllViews);
processOptionImpl(PrintResourcePressureView, EnableAllViews);
processOptionImpl(PrintTimelineView, EnableAllViews);
processOptionImpl(PrintInstructionInfoView, EnableAllViews);
}
const cl::opt<bool> &Default =
EnableAllViews.getPosition() < EnableAllStats.getPosition()
? EnableAllStats
: EnableAllViews;
processOptionImpl(PrintRegisterFileStats, Default);
processOptionImpl(PrintDispatchStats, Default);
processOptionImpl(PrintSchedulerStats, Default);
if (IsOutOfOrder)
processOptionImpl(PrintRetireStats, Default);
}
// Returns true on success.
static bool runPipeline(mca::Pipeline &P) {
// Handle pipeline errors here.
Expected<unsigned> Cycles = P.run();
if (!Cycles) {
WithColor::error() << toString(Cycles.takeError());
return false;
}
return true;
}
int main(int argc, char **argv) {
InitLLVM X(argc, argv);
// Initialize targets and assembly parsers.
InitializeAllTargetInfos();
InitializeAllTargetMCs();
InitializeAllAsmParsers();
// Enable printing of available targets when flag --version is specified.
cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
cl::HideUnrelatedOptions({&ToolOptions, &ViewOptions});
// Parse flags and initialize target options.
cl::ParseCommandLineOptions(argc, argv,
"llvm machine code performance analyzer.\n");
// Get the target from the triple. If a triple is not specified, then select
// the default triple for the host. If the triple doesn't correspond to any
// registered target, then exit with an error message.
const char *ProgName = argv[0];
const Target *TheTarget = getTarget(ProgName);
if (!TheTarget)
return 1;
// GetTarget() may replaced TripleName with a default triple.
// For safety, reconstruct the Triple object.
Triple TheTriple(TripleName);
ErrorOr<std::unique_ptr<MemoryBuffer>> BufferPtr =
MemoryBuffer::getFileOrSTDIN(InputFilename);
if (std::error_code EC = BufferPtr.getError()) {
WithColor::error() << InputFilename << ": " << EC.message() << '\n';
return 1;
}
if (MCPU == "native")
MCPU = std::string(llvm::sys::getHostCPUName());
std::unique_ptr<MCSubtargetInfo> STI(
TheTarget->createMCSubtargetInfo(TripleName, MCPU, MATTR));
assert(STI && "Unable to create subtarget info!");
if (!STI->isCPUStringValid(MCPU))
return 1;
bool IsOutOfOrder = STI->getSchedModel().isOutOfOrder();
if (!PrintInstructionTables && !IsOutOfOrder) {
WithColor::warning() << "support for in-order CPU '" << MCPU
<< "' is experimental.\n";
}
if (!STI->getSchedModel().hasInstrSchedModel()) {
WithColor::error()
<< "unable to find instruction-level scheduling information for"
<< " target triple '" << TheTriple.normalize() << "' and cpu '" << MCPU
<< "'.\n";
if (STI->getSchedModel().InstrItineraries)
WithColor::note()
<< "cpu '" << MCPU << "' provides itineraries. However, "
<< "instruction itineraries are currently unsupported.\n";
return 1;
}
// Apply overrides to llvm-mca specific options.
processViewOptions(IsOutOfOrder);
std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
assert(MRI && "Unable to create target register info!");
MCTargetOptions MCOptions = mc::InitMCTargetOptionsFromFlags();
std::unique_ptr<MCAsmInfo> MAI(
TheTarget->createMCAsmInfo(*MRI, TripleName, MCOptions));
assert(MAI && "Unable to create target asm info!");
SourceMgr SrcMgr;
// Tell SrcMgr about this buffer, which is what the parser will pick up.
SrcMgr.AddNewSourceBuffer(std::move(*BufferPtr), SMLoc());
MCContext Ctx(TheTriple, MAI.get(), MRI.get(), STI.get(), &SrcMgr);
std::unique_ptr<MCObjectFileInfo> MOFI(
TheTarget->createMCObjectFileInfo(Ctx, /*PIC=*/false));
Ctx.setObjectFileInfo(MOFI.get());
std::unique_ptr<buffer_ostream> BOS;
std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
assert(MCII && "Unable to create instruction info!");
std::unique_ptr<MCInstrAnalysis> MCIA(
TheTarget->createMCInstrAnalysis(MCII.get()));
// Need to initialize an MCInstPrinter as it is
// required for initializing the MCTargetStreamer
// which needs to happen within the CRG.parseCodeRegions() call below.
// Without an MCTargetStreamer, certain assembly directives can trigger a
// segfault. (For example, the .cv_fpo_proc directive on x86 will segfault if
// we don't initialize the MCTargetStreamer.)
unsigned IPtempOutputAsmVariant =
OutputAsmVariant == -1 ? 0 : OutputAsmVariant;
std::unique_ptr<MCInstPrinter> IPtemp(TheTarget->createMCInstPrinter(
Triple(TripleName), IPtempOutputAsmVariant, *MAI, *MCII, *MRI));
if (!IPtemp) {
WithColor::error()
<< "unable to create instruction printer for target triple '"
<< TheTriple.normalize() << "' with assembly variant "
<< IPtempOutputAsmVariant << ".\n";
return 1;
}
// Parse the input and create CodeRegions that llvm-mca can analyze.
mca::AsmCodeRegionGenerator CRG(*TheTarget, SrcMgr, Ctx, *MAI, *STI, *MCII);
Expected<const mca::CodeRegions &> RegionsOrErr =
CRG.parseCodeRegions(std::move(IPtemp));
if (!RegionsOrErr) {
if (auto Err =
handleErrors(RegionsOrErr.takeError(), [](const StringError &E) {
WithColor::error() << E.getMessage() << '\n';
})) {
// Default case.
WithColor::error() << toString(std::move(Err)) << '\n';
}
return 1;
}
const mca::CodeRegions &Regions = *RegionsOrErr;
// Early exit if errors were found by the code region parsing logic.
if (!Regions.isValid())
return 1;
if (Regions.empty()) {
WithColor::error() << "no assembly instructions found.\n";
return 1;
}
// Now initialize the output file.
auto OF = getOutputStream();
if (std::error_code EC = OF.getError()) {
WithColor::error() << EC.message() << '\n';
return 1;
}
unsigned AssemblerDialect = CRG.getAssemblerDialect();
if (OutputAsmVariant >= 0)
AssemblerDialect = static_cast<unsigned>(OutputAsmVariant);
std::unique_ptr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
Triple(TripleName), AssemblerDialect, *MAI, *MCII, *MRI));
if (!IP) {
WithColor::error()
<< "unable to create instruction printer for target triple '"
<< TheTriple.normalize() << "' with assembly variant "
<< AssemblerDialect << ".\n";
return 1;
}
// Set the display preference for hex vs. decimal immediates.
IP->setPrintImmHex(PrintImmHex);
std::unique_ptr<ToolOutputFile> TOF = std::move(*OF);
const MCSchedModel &SM = STI->getSchedModel();
// Create an instruction builder.
mca::InstrBuilder IB(*STI, *MCII, *MRI, MCIA.get());
// Create a context to control ownership of the pipeline hardware.
mca::Context MCA(*MRI, *STI);
mca::PipelineOptions PO(MicroOpQueue, DecoderThroughput, DispatchWidth,
RegisterFileSize, LoadQueueSize, StoreQueueSize,
AssumeNoAlias, EnableBottleneckAnalysis);
// Number each region in the sequence.
unsigned RegionIdx = 0;
std::unique_ptr<MCCodeEmitter> MCE(
TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx));
assert(MCE && "Unable to create code emitter!");
std::unique_ptr<MCAsmBackend> MAB(TheTarget->createMCAsmBackend(
*STI, *MRI, mc::InitMCTargetOptionsFromFlags()));
assert(MAB && "Unable to create asm backend!");
for (const std::unique_ptr<mca::CodeRegion> &Region : Regions) {
// Skip empty code regions.
if (Region->empty())
continue;
// Don't print the header of this region if it is the default region, and
// it doesn't have an end location.
if (Region->startLoc().isValid() || Region->endLoc().isValid()) {
TOF->os() << "\n[" << RegionIdx++ << "] Code Region";
StringRef Desc = Region->getDescription();
if (!Desc.empty())
TOF->os() << " - " << Desc;
TOF->os() << "\n\n";
}
// Lower the MCInst sequence into an mca::Instruction sequence.
ArrayRef<MCInst> Insts = Region->getInstructions();
mca::CodeEmitter CE(*STI, *MAB, *MCE, Insts);
std::vector<std::unique_ptr<mca::Instruction>> LoweredSequence;
for (const MCInst &MCI : Insts) {
Expected<std::unique_ptr<mca::Instruction>> Inst =
IB.createInstruction(MCI);
if (!Inst) {
if (auto NewE = handleErrors(
Inst.takeError(),
[&IP, &STI](const mca::InstructionError<MCInst> &IE) {
std::string InstructionStr;
raw_string_ostream SS(InstructionStr);
WithColor::error() << IE.Message << '\n';
IP->printInst(&IE.Inst, 0, "", *STI, SS);
SS.flush();
WithColor::note()
<< "instruction: " << InstructionStr << '\n';
})) {
// Default case.
WithColor::error() << toString(std::move(NewE));
}
return 1;
}
LoweredSequence.emplace_back(std::move(Inst.get()));
}
mca::SourceMgr S(LoweredSequence, PrintInstructionTables ? 1 : Iterations);
if (PrintInstructionTables) {
// Create a pipeline, stages, and a printer.
auto P = std::make_unique<mca::Pipeline>();
P->appendStage(std::make_unique<mca::EntryStage>(S));
P->appendStage(std::make_unique<mca::InstructionTables>(SM));
mca::PipelinePrinter Printer(*P, mca::View::OK_READABLE);
// Create the views for this pipeline, execute, and emit a report.
if (PrintInstructionInfoView) {
Printer.addView(std::make_unique<mca::InstructionInfoView>(
*STI, *MCII, CE, ShowEncoding, Insts, *IP));
}
Printer.addView(
std::make_unique<mca::ResourcePressureView>(*STI, *IP, Insts));
if (!runPipeline(*P))
return 1;
Printer.printReport(TOF->os());
continue;
}
// Create a basic pipeline simulating an out-of-order backend.
auto P = MCA.createDefaultPipeline(PO, S);
mca::PipelinePrinter Printer(*P, PrintJson ? mca::View::OK_JSON
: mca::View::OK_READABLE);
// When we output JSON, we add a view that contains the instructions
// and CPU resource information.
if (PrintJson)
Printer.addView(
std::make_unique<mca::InstructionView>(*STI, *IP, Insts, MCPU));
if (PrintSummaryView)
Printer.addView(
std::make_unique<mca::SummaryView>(SM, Insts, DispatchWidth));
if (EnableBottleneckAnalysis) {
if (!IsOutOfOrder) {
WithColor::warning()
<< "bottleneck analysis is not supported for in-order CPU '" << MCPU
<< "'.\n";
}
Printer.addView(std::make_unique<mca::BottleneckAnalysis>(
*STI, *IP, Insts, S.getNumIterations()));
}
if (PrintInstructionInfoView)
Printer.addView(std::make_unique<mca::InstructionInfoView>(
*STI, *MCII, CE, ShowEncoding, Insts, *IP));
if (PrintDispatchStats)
Printer.addView(std::make_unique<mca::DispatchStatistics>());
if (PrintSchedulerStats)
Printer.addView(std::make_unique<mca::SchedulerStatistics>(*STI));
if (PrintRetireStats)
Printer.addView(std::make_unique<mca::RetireControlUnitStatistics>(SM));
if (PrintRegisterFileStats)
Printer.addView(std::make_unique<mca::RegisterFileStatistics>(*STI));
if (PrintResourcePressureView)
Printer.addView(
std::make_unique<mca::ResourcePressureView>(*STI, *IP, Insts));
if (PrintTimelineView) {
unsigned TimelineIterations =
TimelineMaxIterations ? TimelineMaxIterations : 10;
Printer.addView(std::make_unique<mca::TimelineView>(
*STI, *IP, Insts, std::min(TimelineIterations, S.getNumIterations()),
TimelineMaxCycles));
}
if (!runPipeline(*P))
return 1;
Printer.printReport(TOF->os());
// Clear the InstrBuilder internal state in preparation for another round.
IB.clear();
}
TOF->keep();
return 0;
}
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